Adding upstream version 1.17.13.upstream/1.17.13upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

116 files changed, 17928 insertions, 0 deletions

diff --git a/src/debug/dwarf/attr_string.go b/src/debug/dwarf/attr_string.go
new file mode 100644
index 0000000..8a4fff8
--- /dev/null
+++ b/src/debug/dwarf/attr_string.go
@@ -0,0 +1,265 @@
+// Code generated by "stringer -type Attr -trimprefix=Attr"; DO NOT EDIT.
+
+package dwarf
+
+import "strconv"
+
+func _() {
+	// An "invalid array index" compiler error signifies that the constant values have changed.
+	// Re-run the stringer command to generate them again.
+	var x [1]struct{}
+	_ = x[AttrSibling-1]
+	_ = x[AttrLocation-2]
+	_ = x[AttrName-3]
+	_ = x[AttrOrdering-9]
+	_ = x[AttrByteSize-11]
+	_ = x[AttrBitOffset-12]
+	_ = x[AttrBitSize-13]
+	_ = x[AttrStmtList-16]
+	_ = x[AttrLowpc-17]
+	_ = x[AttrHighpc-18]
+	_ = x[AttrLanguage-19]
+	_ = x[AttrDiscr-21]
+	_ = x[AttrDiscrValue-22]
+	_ = x[AttrVisibility-23]
+	_ = x[AttrImport-24]
+	_ = x[AttrStringLength-25]
+	_ = x[AttrCommonRef-26]
+	_ = x[AttrCompDir-27]
+	_ = x[AttrConstValue-28]
+	_ = x[AttrContainingType-29]
+	_ = x[AttrDefaultValue-30]
+	_ = x[AttrInline-32]
+	_ = x[AttrIsOptional-33]
+	_ = x[AttrLowerBound-34]
+	_ = x[AttrProducer-37]
+	_ = x[AttrPrototyped-39]
+	_ = x[AttrReturnAddr-42]
+	_ = x[AttrStartScope-44]
+	_ = x[AttrStrideSize-46]
+	_ = x[AttrUpperBound-47]
+	_ = x[AttrAbstractOrigin-49]
+	_ = x[AttrAccessibility-50]
+	_ = x[AttrAddrClass-51]
+	_ = x[AttrArtificial-52]
+	_ = x[AttrBaseTypes-53]
+	_ = x[AttrCalling-54]
+	_ = x[AttrCount-55]
+	_ = x[AttrDataMemberLoc-56]
+	_ = x[AttrDeclColumn-57]
+	_ = x[AttrDeclFile-58]
+	_ = x[AttrDeclLine-59]
+	_ = x[AttrDeclaration-60]
+	_ = x[AttrDiscrList-61]
+	_ = x[AttrEncoding-62]
+	_ = x[AttrExternal-63]
+	_ = x[AttrFrameBase-64]
+	_ = x[AttrFriend-65]
+	_ = x[AttrIdentifierCase-66]
+	_ = x[AttrMacroInfo-67]
+	_ = x[AttrNamelistItem-68]
+	_ = x[AttrPriority-69]
+	_ = x[AttrSegment-70]
+	_ = x[AttrSpecification-71]
+	_ = x[AttrStaticLink-72]
+	_ = x[AttrType-73]
+	_ = x[AttrUseLocation-74]
+	_ = x[AttrVarParam-75]
+	_ = x[AttrVirtuality-76]
+	_ = x[AttrVtableElemLoc-77]
+	_ = x[AttrAllocated-78]
+	_ = x[AttrAssociated-79]
+	_ = x[AttrDataLocation-80]
+	_ = x[AttrStride-81]
+	_ = x[AttrEntrypc-82]
+	_ = x[AttrUseUTF8-83]
+	_ = x[AttrExtension-84]
+	_ = x[AttrRanges-85]
+	_ = x[AttrTrampoline-86]
+	_ = x[AttrCallColumn-87]
+	_ = x[AttrCallFile-88]
+	_ = x[AttrCallLine-89]
+	_ = x[AttrDescription-90]
+	_ = x[AttrBinaryScale-91]
+	_ = x[AttrDecimalScale-92]
+	_ = x[AttrSmall-93]
+	_ = x[AttrDecimalSign-94]
+	_ = x[AttrDigitCount-95]
+	_ = x[AttrPictureString-96]
+	_ = x[AttrMutable-97]
+	_ = x[AttrThreadsScaled-98]
+	_ = x[AttrExplicit-99]
+	_ = x[AttrObjectPointer-100]
+	_ = x[AttrEndianity-101]
+	_ = x[AttrElemental-102]
+	_ = x[AttrPure-103]
+	_ = x[AttrRecursive-104]
+	_ = x[AttrSignature-105]
+	_ = x[AttrMainSubprogram-106]
+	_ = x[AttrDataBitOffset-107]
+	_ = x[AttrConstExpr-108]
+	_ = x[AttrEnumClass-109]
+	_ = x[AttrLinkageName-110]
+	_ = x[AttrStringLengthBitSize-111]
+	_ = x[AttrStringLengthByteSize-112]
+	_ = x[AttrRank-113]
+	_ = x[AttrStrOffsetsBase-114]
+	_ = x[AttrAddrBase-115]
+	_ = x[AttrRnglistsBase-116]
+	_ = x[AttrDwoName-118]
+	_ = x[AttrReference-119]
+	_ = x[AttrRvalueReference-120]
+	_ = x[AttrMacros-121]
+	_ = x[AttrCallAllCalls-122]
+	_ = x[AttrCallAllSourceCalls-123]
+	_ = x[AttrCallAllTailCalls-124]
+	_ = x[AttrCallReturnPC-125]
+	_ = x[AttrCallValue-126]
+	_ = x[AttrCallOrigin-127]
+	_ = x[AttrCallParameter-128]
+	_ = x[AttrCallPC-129]
+	_ = x[AttrCallTailCall-130]
+	_ = x[AttrCallTarget-131]
+	_ = x[AttrCallTargetClobbered-132]
+	_ = x[AttrCallDataLocation-133]
+	_ = x[AttrCallDataValue-134]
+	_ = x[AttrNoreturn-135]
+	_ = x[AttrAlignment-136]
+	_ = x[AttrExportSymbols-137]
+	_ = x[AttrDeleted-138]
+	_ = x[AttrDefaulted-139]
+	_ = x[AttrLoclistsBase-140]
+}
+
+const _Attr_name = "SiblingLocationNameOrderingByteSizeBitOffsetBitSizeStmtListLowpcHighpcLanguageDiscrDiscrValueVisibilityImportStringLengthCommonRefCompDirConstValueContainingTypeDefaultValueInlineIsOptionalLowerBoundProducerPrototypedReturnAddrStartScopeStrideSizeUpperBoundAbstractOriginAccessibilityAddrClassArtificialBaseTypesCallingCountDataMemberLocDeclColumnDeclFileDeclLineDeclarationDiscrListEncodingExternalFrameBaseFriendIdentifierCaseMacroInfoNamelistItemPrioritySegmentSpecificationStaticLinkTypeUseLocationVarParamVirtualityVtableElemLocAllocatedAssociatedDataLocationStrideEntrypcUseUTF8ExtensionRangesTrampolineCallColumnCallFileCallLineDescriptionBinaryScaleDecimalScaleSmallDecimalSignDigitCountPictureStringMutableThreadsScaledExplicitObjectPointerEndianityElementalPureRecursiveSignatureMainSubprogramDataBitOffsetConstExprEnumClassLinkageNameStringLengthBitSizeStringLengthByteSizeRankStrOffsetsBaseAddrBaseRnglistsBaseDwoNameReferenceRvalueReferenceMacrosCallAllCallsCallAllSourceCallsCallAllTailCallsCallReturnPCCallValueCallOriginCallParameterCallPCCallTailCallCallTargetCallTargetClobberedCallDataLocationCallDataValueNoreturnAlignmentExportSymbolsDeletedDefaultedLoclistsBase"
+
+var _Attr_map = map[Attr]string{
+	1:   _Attr_name[0:7],
+	2:   _Attr_name[7:15],
+	3:   _Attr_name[15:19],
+	9:   _Attr_name[19:27],
+	11:  _Attr_name[27:35],
+	12:  _Attr_name[35:44],
+	13:  _Attr_name[44:51],
+	16:  _Attr_name[51:59],
+	17:  _Attr_name[59:64],
+	18:  _Attr_name[64:70],
+	19:  _Attr_name[70:78],
+	21:  _Attr_name[78:83],
+	22:  _Attr_name[83:93],
+	23:  _Attr_name[93:103],
+	24:  _Attr_name[103:109],
+	25:  _Attr_name[109:121],
+	26:  _Attr_name[121:130],
+	27:  _Attr_name[130:137],
+	28:  _Attr_name[137:147],
+	29:  _Attr_name[147:161],
+	30:  _Attr_name[161:173],
+	32:  _Attr_name[173:179],
+	33:  _Attr_name[179:189],
+	34:  _Attr_name[189:199],
+	37:  _Attr_name[199:207],
+	39:  _Attr_name[207:217],
+	42:  _Attr_name[217:227],
+	44:  _Attr_name[227:237],
+	46:  _Attr_name[237:247],
+	47:  _Attr_name[247:257],
+	49:  _Attr_name[257:271],
+	50:  _Attr_name[271:284],
+	51:  _Attr_name[284:293],
+	52:  _Attr_name[293:303],
+	53:  _Attr_name[303:312],
+	54:  _Attr_name[312:319],
+	55:  _Attr_name[319:324],
+	56:  _Attr_name[324:337],
+	57:  _Attr_name[337:347],
+	58:  _Attr_name[347:355],
+	59:  _Attr_name[355:363],
+	60:  _Attr_name[363:374],
+	61:  _Attr_name[374:383],
+	62:  _Attr_name[383:391],
+	63:  _Attr_name[391:399],
+	64:  _Attr_name[399:408],
+	65:  _Attr_name[408:414],
+	66:  _Attr_name[414:428],
+	67:  _Attr_name[428:437],
+	68:  _Attr_name[437:449],
+	69:  _Attr_name[449:457],
+	70:  _Attr_name[457:464],
+	71:  _Attr_name[464:477],
+	72:  _Attr_name[477:487],
+	73:  _Attr_name[487:491],
+	74:  _Attr_name[491:502],
+	75:  _Attr_name[502:510],
+	76:  _Attr_name[510:520],
+	77:  _Attr_name[520:533],
+	78:  _Attr_name[533:542],
+	79:  _Attr_name[542:552],
+	80:  _Attr_name[552:564],
+	81:  _Attr_name[564:570],
+	82:  _Attr_name[570:577],
+	83:  _Attr_name[577:584],
+	84:  _Attr_name[584:593],
+	85:  _Attr_name[593:599],
+	86:  _Attr_name[599:609],
+	87:  _Attr_name[609:619],
+	88:  _Attr_name[619:627],
+	89:  _Attr_name[627:635],
+	90:  _Attr_name[635:646],
+	91:  _Attr_name[646:657],
+	92:  _Attr_name[657:669],
+	93:  _Attr_name[669:674],
+	94:  _Attr_name[674:685],
+	95:  _Attr_name[685:695],
+	96:  _Attr_name[695:708],
+	97:  _Attr_name[708:715],
+	98:  _Attr_name[715:728],
+	99:  _Attr_name[728:736],
+	100: _Attr_name[736:749],
+	101: _Attr_name[749:758],
+	102: _Attr_name[758:767],
+	103: _Attr_name[767:771],
+	104: _Attr_name[771:780],
+	105: _Attr_name[780:789],
+	106: _Attr_name[789:803],
+	107: _Attr_name[803:816],
+	108: _Attr_name[816:825],
+	109: _Attr_name[825:834],
+	110: _Attr_name[834:845],
+	111: _Attr_name[845:864],
+	112: _Attr_name[864:884],
+	113: _Attr_name[884:888],
+	114: _Attr_name[888:902],
+	115: _Attr_name[902:910],
+	116: _Attr_name[910:922],
+	118: _Attr_name[922:929],
+	119: _Attr_name[929:938],
+	120: _Attr_name[938:953],
+	121: _Attr_name[953:959],
+	122: _Attr_name[959:971],
+	123: _Attr_name[971:989],
+	124: _Attr_name[989:1005],
+	125: _Attr_name[1005:1017],
+	126: _Attr_name[1017:1026],
+	127: _Attr_name[1026:1036],
+	128: _Attr_name[1036:1049],
+	129: _Attr_name[1049:1055],
+	130: _Attr_name[1055:1067],
+	131: _Attr_name[1067:1077],
+	132: _Attr_name[1077:1096],
+	133: _Attr_name[1096:1112],
+	134: _Attr_name[1112:1125],
+	135: _Attr_name[1125:1133],
+	136: _Attr_name[1133:1142],
+	137: _Attr_name[1142:1155],
+	138: _Attr_name[1155:1162],
+	139: _Attr_name[1162:1171],
+	140: _Attr_name[1171:1183],
+}
+
+func (i Attr) String() string {
+	if str, ok := _Attr_map[i]; ok {
+		return str
+	}
+	return "Attr(" + strconv.FormatInt(int64(i), 10) + ")"
+}
diff --git a/src/debug/dwarf/buf.go b/src/debug/dwarf/buf.go
new file mode 100644
index 0000000..c3822a0
--- /dev/null
+++ b/src/debug/dwarf/buf.go
@@ -0,0 +1,205 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Buffered reading and decoding of DWARF data streams.
+
+package dwarf
+
+import (
+	"bytes"
+	"encoding/binary"
+	"strconv"
+)
+
+// Data buffer being decoded.
+type buf struct {
+	dwarf  *Data
+	order  binary.ByteOrder
+	format dataFormat
+	name   string
+	off    Offset
+	data   []byte
+	err    error
+}
+
+// Data format, other than byte order. This affects the handling of
+// certain field formats.
+type dataFormat interface {
+	// DWARF version number. Zero means unknown.
+	version() int
+
+	// 64-bit DWARF format?
+	dwarf64() (dwarf64 bool, isKnown bool)
+
+	// Size of an address, in bytes. Zero means unknown.
+	addrsize() int
+}
+
+// Some parts of DWARF have no data format, e.g., abbrevs.
+type unknownFormat struct{}
+
+func (u unknownFormat) version() int {
+	return 0
+}
+
+func (u unknownFormat) dwarf64() (bool, bool) {
+	return false, false
+}
+
+func (u unknownFormat) addrsize() int {
+	return 0
+}
+
+func makeBuf(d *Data, format dataFormat, name string, off Offset, data []byte) buf {
+	return buf{d, d.order, format, name, off, data, nil}
+}
+
+func (b *buf) uint8() uint8 {
+	if len(b.data) < 1 {
+		b.error("underflow")
+		return 0
+	}
+	val := b.data[0]
+	b.data = b.data[1:]
+	b.off++
+	return val
+}
+
+func (b *buf) bytes(n int) []byte {
+	if len(b.data) < n {
+		b.error("underflow")
+		return nil
+	}
+	data := b.data[0:n]
+	b.data = b.data[n:]
+	b.off += Offset(n)
+	return data
+}
+
+func (b *buf) skip(n int) { b.bytes(n) }
+
+func (b *buf) string() string {
+	i := bytes.IndexByte(b.data, 0)
+	if i < 0 {
+		b.error("underflow")
+		return ""
+	}
+
+	s := string(b.data[0:i])
+	b.data = b.data[i+1:]
+	b.off += Offset(i + 1)
+	return s
+}
+
+func (b *buf) uint16() uint16 {
+	a := b.bytes(2)
+	if a == nil {
+		return 0
+	}
+	return b.order.Uint16(a)
+}
+
+func (b *buf) uint24() uint32 {
+	a := b.bytes(3)
+	if a == nil {
+		return 0
+	}
+	if b.dwarf.bigEndian {
+		return uint32(a[2]) | uint32(a[1])<<8 | uint32(a[0])<<16
+	} else {
+		return uint32(a[0]) | uint32(a[1])<<8 | uint32(a[2])<<16
+	}
+}
+
+func (b *buf) uint32() uint32 {
+	a := b.bytes(4)
+	if a == nil {
+		return 0
+	}
+	return b.order.Uint32(a)
+}
+
+func (b *buf) uint64() uint64 {
+	a := b.bytes(8)
+	if a == nil {
+		return 0
+	}
+	return b.order.Uint64(a)
+}
+
+// Read a varint, which is 7 bits per byte, little endian.
+// the 0x80 bit means read another byte.
+func (b *buf) varint() (c uint64, bits uint) {
+	for i := 0; i < len(b.data); i++ {
+		byte := b.data[i]
+		c |= uint64(byte&0x7F) << bits
+		bits += 7
+		if byte&0x80 == 0 {
+			b.off += Offset(i + 1)
+			b.data = b.data[i+1:]
+			return c, bits
+		}
+	}
+	return 0, 0
+}
+
+// Unsigned int is just a varint.
+func (b *buf) uint() uint64 {
+	x, _ := b.varint()
+	return x
+}
+
+// Signed int is a sign-extended varint.
+func (b *buf) int() int64 {
+	ux, bits := b.varint()
+	x := int64(ux)
+	if x&(1<<(bits-1)) != 0 {
+		x |= -1 << bits
+	}
+	return x
+}
+
+// Address-sized uint.
+func (b *buf) addr() uint64 {
+	switch b.format.addrsize() {
+	case 1:
+		return uint64(b.uint8())
+	case 2:
+		return uint64(b.uint16())
+	case 4:
+		return uint64(b.uint32())
+	case 8:
+		return b.uint64()
+	}
+	b.error("unknown address size")
+	return 0
+}
+
+func (b *buf) unitLength() (length Offset, dwarf64 bool) {
+	length = Offset(b.uint32())
+	if length == 0xffffffff {
+		dwarf64 = true
+		length = Offset(b.uint64())
+	} else if length >= 0xfffffff0 {
+		b.error("unit length has reserved value")
+	}
+	return
+}
+
+func (b *buf) error(s string) {
+	if b.err == nil {
+		b.data = nil
+		b.err = DecodeError{b.name, b.off, s}
+	}
+}
+
+type DecodeError struct {
+	Name   string
+	Offset Offset
+	Err    string
+}
+
+func (e DecodeError) Error() string {
+	return "decoding dwarf section " + e.Name + " at offset 0x" + strconv.FormatInt(int64(e.Offset), 16) + ": " + e.Err
+}
diff --git a/src/debug/dwarf/class_string.go b/src/debug/dwarf/class_string.go
new file mode 100644
index 0000000..76de7ca
--- /dev/null
+++ b/src/debug/dwarf/class_string.go
@@ -0,0 +1,37 @@
+// Code generated by "stringer -type=Class"; DO NOT EDIT.
+
+package dwarf
+
+import "strconv"
+
+func _() {
+	// An "invalid array index" compiler error signifies that the constant values have changed.
+	// Re-run the stringer command to generate them again.
+	var x [1]struct{}
+	_ = x[ClassUnknown-0]
+	_ = x[ClassAddress-1]
+	_ = x[ClassBlock-2]
+	_ = x[ClassConstant-3]
+	_ = x[ClassExprLoc-4]
+	_ = x[ClassFlag-5]
+	_ = x[ClassLinePtr-6]
+	_ = x[ClassLocListPtr-7]
+	_ = x[ClassMacPtr-8]
+	_ = x[ClassRangeListPtr-9]
+	_ = x[ClassReference-10]
+	_ = x[ClassReferenceSig-11]
+	_ = x[ClassString-12]
+	_ = x[ClassReferenceAlt-13]
+	_ = x[ClassStringAlt-14]
+}
+
+const _Class_name = "ClassUnknownClassAddressClassBlockClassConstantClassExprLocClassFlagClassLinePtrClassLocListPtrClassMacPtrClassRangeListPtrClassReferenceClassReferenceSigClassStringClassReferenceAltClassStringAlt"
+
+var _Class_index = [...]uint8{0, 12, 24, 34, 47, 59, 68, 80, 95, 106, 123, 137, 154, 165, 182, 196}
+
+func (i Class) String() string {
+	if i < 0 || i >= Class(len(_Class_index)-1) {
+		return "Class(" + strconv.FormatInt(int64(i), 10) + ")"
+	}
+	return _Class_name[_Class_index[i]:_Class_index[i+1]]
+}
diff --git a/src/debug/dwarf/const.go b/src/debug/dwarf/const.go
new file mode 100644
index 0000000..c0a74b0
--- /dev/null
+++ b/src/debug/dwarf/const.go
@@ -0,0 +1,475 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Constants
+
+package dwarf
+
+//go:generate stringer -type Attr -trimprefix=Attr
+
+// An Attr identifies the attribute type in a DWARF Entry's Field.
+type Attr uint32
+
+const (
+	AttrSibling        Attr = 0x01
+	AttrLocation       Attr = 0x02
+	AttrName           Attr = 0x03
+	AttrOrdering       Attr = 0x09
+	AttrByteSize       Attr = 0x0B
+	AttrBitOffset      Attr = 0x0C
+	AttrBitSize        Attr = 0x0D
+	AttrStmtList       Attr = 0x10
+	AttrLowpc          Attr = 0x11
+	AttrHighpc         Attr = 0x12
+	AttrLanguage       Attr = 0x13
+	AttrDiscr          Attr = 0x15
+	AttrDiscrValue     Attr = 0x16
+	AttrVisibility     Attr = 0x17
+	AttrImport         Attr = 0x18
+	AttrStringLength   Attr = 0x19
+	AttrCommonRef      Attr = 0x1A
+	AttrCompDir        Attr = 0x1B
+	AttrConstValue     Attr = 0x1C
+	AttrContainingType Attr = 0x1D
+	AttrDefaultValue   Attr = 0x1E
+	AttrInline         Attr = 0x20
+	AttrIsOptional     Attr = 0x21
+	AttrLowerBound     Attr = 0x22
+	AttrProducer       Attr = 0x25
+	AttrPrototyped     Attr = 0x27
+	AttrReturnAddr     Attr = 0x2A
+	AttrStartScope     Attr = 0x2C
+	AttrStrideSize     Attr = 0x2E
+	AttrUpperBound     Attr = 0x2F
+	AttrAbstractOrigin Attr = 0x31
+	AttrAccessibility  Attr = 0x32
+	AttrAddrClass      Attr = 0x33
+	AttrArtificial     Attr = 0x34
+	AttrBaseTypes      Attr = 0x35
+	AttrCalling        Attr = 0x36
+	AttrCount          Attr = 0x37
+	AttrDataMemberLoc  Attr = 0x38
+	AttrDeclColumn     Attr = 0x39
+	AttrDeclFile       Attr = 0x3A
+	AttrDeclLine       Attr = 0x3B
+	AttrDeclaration    Attr = 0x3C
+	AttrDiscrList      Attr = 0x3D
+	AttrEncoding       Attr = 0x3E
+	AttrExternal       Attr = 0x3F
+	AttrFrameBase      Attr = 0x40
+	AttrFriend         Attr = 0x41
+	AttrIdentifierCase Attr = 0x42
+	AttrMacroInfo      Attr = 0x43
+	AttrNamelistItem   Attr = 0x44
+	AttrPriority       Attr = 0x45
+	AttrSegment        Attr = 0x46
+	AttrSpecification  Attr = 0x47
+	AttrStaticLink     Attr = 0x48
+	AttrType           Attr = 0x49
+	AttrUseLocation    Attr = 0x4A
+	AttrVarParam       Attr = 0x4B
+	AttrVirtuality     Attr = 0x4C
+	AttrVtableElemLoc  Attr = 0x4D
+	// The following are new in DWARF 3.
+	AttrAllocated     Attr = 0x4E
+	AttrAssociated    Attr = 0x4F
+	AttrDataLocation  Attr = 0x50
+	AttrStride        Attr = 0x51
+	AttrEntrypc       Attr = 0x52
+	AttrUseUTF8       Attr = 0x53
+	AttrExtension     Attr = 0x54
+	AttrRanges        Attr = 0x55
+	AttrTrampoline    Attr = 0x56
+	AttrCallColumn    Attr = 0x57
+	AttrCallFile      Attr = 0x58
+	AttrCallLine      Attr = 0x59
+	AttrDescription   Attr = 0x5A
+	AttrBinaryScale   Attr = 0x5B
+	AttrDecimalScale  Attr = 0x5C
+	AttrSmall         Attr = 0x5D
+	AttrDecimalSign   Attr = 0x5E
+	AttrDigitCount    Attr = 0x5F
+	AttrPictureString Attr = 0x60
+	AttrMutable       Attr = 0x61
+	AttrThreadsScaled Attr = 0x62
+	AttrExplicit      Attr = 0x63
+	AttrObjectPointer Attr = 0x64
+	AttrEndianity     Attr = 0x65
+	AttrElemental     Attr = 0x66
+	AttrPure          Attr = 0x67
+	AttrRecursive     Attr = 0x68
+	// The following are new in DWARF 4.
+	AttrSignature      Attr = 0x69
+	AttrMainSubprogram Attr = 0x6A
+	AttrDataBitOffset  Attr = 0x6B
+	AttrConstExpr      Attr = 0x6C
+	AttrEnumClass      Attr = 0x6D
+	AttrLinkageName    Attr = 0x6E
+	// The following are new in DWARF 5.
+	AttrStringLengthBitSize  Attr = 0x6F
+	AttrStringLengthByteSize Attr = 0x70
+	AttrRank                 Attr = 0x71
+	AttrStrOffsetsBase       Attr = 0x72
+	AttrAddrBase             Attr = 0x73
+	AttrRnglistsBase         Attr = 0x74
+	AttrDwoName              Attr = 0x76
+	AttrReference            Attr = 0x77
+	AttrRvalueReference      Attr = 0x78
+	AttrMacros               Attr = 0x79
+	AttrCallAllCalls         Attr = 0x7A
+	AttrCallAllSourceCalls   Attr = 0x7B
+	AttrCallAllTailCalls     Attr = 0x7C
+	AttrCallReturnPC         Attr = 0x7D
+	AttrCallValue            Attr = 0x7E
+	AttrCallOrigin           Attr = 0x7F
+	AttrCallParameter        Attr = 0x80
+	AttrCallPC               Attr = 0x81
+	AttrCallTailCall         Attr = 0x82
+	AttrCallTarget           Attr = 0x83
+	AttrCallTargetClobbered  Attr = 0x84
+	AttrCallDataLocation     Attr = 0x85
+	AttrCallDataValue        Attr = 0x86
+	AttrNoreturn             Attr = 0x87
+	AttrAlignment            Attr = 0x88
+	AttrExportSymbols        Attr = 0x89
+	AttrDeleted              Attr = 0x8A
+	AttrDefaulted            Attr = 0x8B
+	AttrLoclistsBase         Attr = 0x8C
+)
+
+func (a Attr) GoString() string {
+	if str, ok := _Attr_map[a]; ok {
+		return "dwarf.Attr" + str
+	}
+	return "dwarf." + a.String()
+}
+
+// A format is a DWARF data encoding format.
+type format uint32
+
+const (
+	// value formats
+	formAddr        format = 0x01
+	formDwarfBlock2 format = 0x03
+	formDwarfBlock4 format = 0x04
+	formData2       format = 0x05
+	formData4       format = 0x06
+	formData8       format = 0x07
+	formString      format = 0x08
+	formDwarfBlock  format = 0x09
+	formDwarfBlock1 format = 0x0A
+	formData1       format = 0x0B
+	formFlag        format = 0x0C
+	formSdata       format = 0x0D
+	formStrp        format = 0x0E
+	formUdata       format = 0x0F
+	formRefAddr     format = 0x10
+	formRef1        format = 0x11
+	formRef2        format = 0x12
+	formRef4        format = 0x13
+	formRef8        format = 0x14
+	formRefUdata    format = 0x15
+	formIndirect    format = 0x16
+	// The following are new in DWARF 4.
+	formSecOffset   format = 0x17
+	formExprloc     format = 0x18
+	formFlagPresent format = 0x19
+	formRefSig8     format = 0x20
+	// The following are new in DWARF 5.
+	formStrx          format = 0x1A
+	formAddrx         format = 0x1B
+	formRefSup4       format = 0x1C
+	formStrpSup       format = 0x1D
+	formData16        format = 0x1E
+	formLineStrp      format = 0x1F
+	formImplicitConst format = 0x21
+	formLoclistx      format = 0x22
+	formRnglistx      format = 0x23
+	formRefSup8       format = 0x24
+	formStrx1         format = 0x25
+	formStrx2         format = 0x26
+	formStrx3         format = 0x27
+	formStrx4         format = 0x28
+	formAddrx1        format = 0x29
+	formAddrx2        format = 0x2A
+	formAddrx3        format = 0x2B
+	formAddrx4        format = 0x2C
+	// Extensions for multi-file compression (.dwz)
+	// http://www.dwarfstd.org/ShowIssue.php?issue=120604.1
+	formGnuRefAlt  format = 0x1f20
+	formGnuStrpAlt format = 0x1f21
+)
+
+//go:generate stringer -type Tag -trimprefix=Tag
+
+// A Tag is the classification (the type) of an Entry.
+type Tag uint32
+
+const (
+	TagArrayType              Tag = 0x01
+	TagClassType              Tag = 0x02
+	TagEntryPoint             Tag = 0x03
+	TagEnumerationType        Tag = 0x04
+	TagFormalParameter        Tag = 0x05
+	TagImportedDeclaration    Tag = 0x08
+	TagLabel                  Tag = 0x0A
+	TagLexDwarfBlock          Tag = 0x0B
+	TagMember                 Tag = 0x0D
+	TagPointerType            Tag = 0x0F
+	TagReferenceType          Tag = 0x10
+	TagCompileUnit            Tag = 0x11
+	TagStringType             Tag = 0x12
+	TagStructType             Tag = 0x13
+	TagSubroutineType         Tag = 0x15
+	TagTypedef                Tag = 0x16
+	TagUnionType              Tag = 0x17
+	TagUnspecifiedParameters  Tag = 0x18
+	TagVariant                Tag = 0x19
+	TagCommonDwarfBlock       Tag = 0x1A
+	TagCommonInclusion        Tag = 0x1B
+	TagInheritance            Tag = 0x1C
+	TagInlinedSubroutine      Tag = 0x1D
+	TagModule                 Tag = 0x1E
+	TagPtrToMemberType        Tag = 0x1F
+	TagSetType                Tag = 0x20
+	TagSubrangeType           Tag = 0x21
+	TagWithStmt               Tag = 0x22
+	TagAccessDeclaration      Tag = 0x23
+	TagBaseType               Tag = 0x24
+	TagCatchDwarfBlock        Tag = 0x25
+	TagConstType              Tag = 0x26
+	TagConstant               Tag = 0x27
+	TagEnumerator             Tag = 0x28
+	TagFileType               Tag = 0x29
+	TagFriend                 Tag = 0x2A
+	TagNamelist               Tag = 0x2B
+	TagNamelistItem           Tag = 0x2C
+	TagPackedType             Tag = 0x2D
+	TagSubprogram             Tag = 0x2E
+	TagTemplateTypeParameter  Tag = 0x2F
+	TagTemplateValueParameter Tag = 0x30
+	TagThrownType             Tag = 0x31
+	TagTryDwarfBlock          Tag = 0x32
+	TagVariantPart            Tag = 0x33
+	TagVariable               Tag = 0x34
+	TagVolatileType           Tag = 0x35
+	// The following are new in DWARF 3.
+	TagDwarfProcedure  Tag = 0x36
+	TagRestrictType    Tag = 0x37
+	TagInterfaceType   Tag = 0x38
+	TagNamespace       Tag = 0x39
+	TagImportedModule  Tag = 0x3A
+	TagUnspecifiedType Tag = 0x3B
+	TagPartialUnit     Tag = 0x3C
+	TagImportedUnit    Tag = 0x3D
+	TagMutableType     Tag = 0x3E // Later removed from DWARF.
+	TagCondition       Tag = 0x3F
+	TagSharedType      Tag = 0x40
+	// The following are new in DWARF 4.
+	TagTypeUnit            Tag = 0x41
+	TagRvalueReferenceType Tag = 0x42
+	TagTemplateAlias       Tag = 0x43
+	// The following are new in DWARF 5.
+	TagCoarrayType       Tag = 0x44
+	TagGenericSubrange   Tag = 0x45
+	TagDynamicType       Tag = 0x46
+	TagAtomicType        Tag = 0x47
+	TagCallSite          Tag = 0x48
+	TagCallSiteParameter Tag = 0x49
+	TagSkeletonUnit      Tag = 0x4A
+	TagImmutableType     Tag = 0x4B
+)
+
+func (t Tag) GoString() string {
+	if t <= TagTemplateAlias {
+		return "dwarf.Tag" + t.String()
+	}
+	return "dwarf." + t.String()
+}
+
+// Location expression operators.
+// The debug info encodes value locations like 8(R3)
+// as a sequence of these op codes.
+// This package does not implement full expressions;
+// the opPlusUconst operator is expected by the type parser.
+const (
+	opAddr       = 0x03 /* 1 op, const addr */
+	opDeref      = 0x06
+	opConst1u    = 0x08 /* 1 op, 1 byte const */
+	opConst1s    = 0x09 /*	" signed */
+	opConst2u    = 0x0A /* 1 op, 2 byte const  */
+	opConst2s    = 0x0B /*	" signed */
+	opConst4u    = 0x0C /* 1 op, 4 byte const */
+	opConst4s    = 0x0D /*	" signed */
+	opConst8u    = 0x0E /* 1 op, 8 byte const */
+	opConst8s    = 0x0F /*	" signed */
+	opConstu     = 0x10 /* 1 op, LEB128 const */
+	opConsts     = 0x11 /*	" signed */
+	opDup        = 0x12
+	opDrop       = 0x13
+	opOver       = 0x14
+	opPick       = 0x15 /* 1 op, 1 byte stack index */
+	opSwap       = 0x16
+	opRot        = 0x17
+	opXderef     = 0x18
+	opAbs        = 0x19
+	opAnd        = 0x1A
+	opDiv        = 0x1B
+	opMinus      = 0x1C
+	opMod        = 0x1D
+	opMul        = 0x1E
+	opNeg        = 0x1F
+	opNot        = 0x20
+	opOr         = 0x21
+	opPlus       = 0x22
+	opPlusUconst = 0x23 /* 1 op, ULEB128 addend */
+	opShl        = 0x24
+	opShr        = 0x25
+	opShra       = 0x26
+	opXor        = 0x27
+	opSkip       = 0x2F /* 1 op, signed 2-byte constant */
+	opBra        = 0x28 /* 1 op, signed 2-byte constant */
+	opEq         = 0x29
+	opGe         = 0x2A
+	opGt         = 0x2B
+	opLe         = 0x2C
+	opLt         = 0x2D
+	opNe         = 0x2E
+	opLit0       = 0x30
+	/* OpLitN = OpLit0 + N for N = 0..31 */
+	opReg0 = 0x50
+	/* OpRegN = OpReg0 + N for N = 0..31 */
+	opBreg0 = 0x70 /* 1 op, signed LEB128 constant */
+	/* OpBregN = OpBreg0 + N for N = 0..31 */
+	opRegx       = 0x90 /* 1 op, ULEB128 register */
+	opFbreg      = 0x91 /* 1 op, SLEB128 offset */
+	opBregx      = 0x92 /* 2 op, ULEB128 reg; SLEB128 off */
+	opPiece      = 0x93 /* 1 op, ULEB128 size of piece */
+	opDerefSize  = 0x94 /* 1-byte size of data retrieved */
+	opXderefSize = 0x95 /* 1-byte size of data retrieved */
+	opNop        = 0x96
+	// The following are new in DWARF 3.
+	opPushObjAddr    = 0x97
+	opCall2          = 0x98 /* 2-byte offset of DIE */
+	opCall4          = 0x99 /* 4-byte offset of DIE */
+	opCallRef        = 0x9A /* 4- or 8- byte offset of DIE */
+	opFormTLSAddress = 0x9B
+	opCallFrameCFA   = 0x9C
+	opBitPiece       = 0x9D
+	// The following are new in DWARF 4.
+	opImplicitValue = 0x9E
+	opStackValue    = 0x9F
+	// The following a new in DWARF 5.
+	opImplicitPointer = 0xA0
+	opAddrx           = 0xA1
+	opConstx          = 0xA2
+	opEntryValue      = 0xA3
+	opConstType       = 0xA4
+	opRegvalType      = 0xA5
+	opDerefType       = 0xA6
+	opXderefType      = 0xA7
+	opConvert         = 0xA8
+	opReinterpret     = 0xA9
+	/* 0xE0-0xFF reserved for user-specific */
+)
+
+// Basic type encodings -- the value for AttrEncoding in a TagBaseType Entry.
+const (
+	encAddress      = 0x01
+	encBoolean      = 0x02
+	encComplexFloat = 0x03
+	encFloat        = 0x04
+	encSigned       = 0x05
+	encSignedChar   = 0x06
+	encUnsigned     = 0x07
+	encUnsignedChar = 0x08
+	// The following are new in DWARF 3.
+	encImaginaryFloat = 0x09
+	encPackedDecimal  = 0x0A
+	encNumericString  = 0x0B
+	encEdited         = 0x0C
+	encSignedFixed    = 0x0D
+	encUnsignedFixed  = 0x0E
+	encDecimalFloat   = 0x0F
+	// The following are new in DWARF 4.
+	encUTF = 0x10
+	// The following are new in DWARF 5.
+	encUCS   = 0x11
+	encASCII = 0x12
+)
+
+// Statement program standard opcode encodings.
+const (
+	lnsCopy           = 1
+	lnsAdvancePC      = 2
+	lnsAdvanceLine    = 3
+	lnsSetFile        = 4
+	lnsSetColumn      = 5
+	lnsNegateStmt     = 6
+	lnsSetBasicBlock  = 7
+	lnsConstAddPC     = 8
+	lnsFixedAdvancePC = 9
+
+	// DWARF 3
+	lnsSetPrologueEnd   = 10
+	lnsSetEpilogueBegin = 11
+	lnsSetISA           = 12
+)
+
+// Statement program extended opcode encodings.
+const (
+	lneEndSequence = 1
+	lneSetAddress  = 2
+	lneDefineFile  = 3
+
+	// DWARF 4
+	lneSetDiscriminator = 4
+)
+
+// Line table directory and file name entry formats.
+// These are new in DWARF 5.
+const (
+	lnctPath           = 0x01
+	lnctDirectoryIndex = 0x02
+	lnctTimestamp      = 0x03
+	lnctSize           = 0x04
+	lnctMD5            = 0x05
+)
+
+// Location list entry codes.
+// These are new in DWARF 5.
+const (
+	lleEndOfList       = 0x00
+	lleBaseAddressx    = 0x01
+	lleStartxEndx      = 0x02
+	lleStartxLength    = 0x03
+	lleOffsetPair      = 0x04
+	lleDefaultLocation = 0x05
+	lleBaseAddress     = 0x06
+	lleStartEnd        = 0x07
+	lleStartLength     = 0x08
+)
+
+// Unit header unit type encodings.
+// These are new in DWARF 5.
+const (
+	utCompile      = 0x01
+	utType         = 0x02
+	utPartial      = 0x03
+	utSkeleton     = 0x04
+	utSplitCompile = 0x05
+	utSplitType    = 0x06
+)
+
+// Opcodes for DWARFv5 debug_rnglists section.
+const (
+	rleEndOfList    = 0x0
+	rleBaseAddressx = 0x1
+	rleStartxEndx   = 0x2
+	rleStartxLength = 0x3
+	rleOffsetPair   = 0x4
+	rleBaseAddress  = 0x5
+	rleStartEnd     = 0x6
+	rleStartLength  = 0x7
+)
diff --git a/src/debug/dwarf/dwarf5ranges_test.go b/src/debug/dwarf/dwarf5ranges_test.go
new file mode 100644
index 0000000..8bc50bc
--- /dev/null
+++ b/src/debug/dwarf/dwarf5ranges_test.go
@@ -0,0 +1,41 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package dwarf
+
+import (
+	"encoding/binary"
+	"os"
+	"reflect"
+	"testing"
+)
+
+func TestDwarf5Ranges(t *testing.T) {
+	rngLists, err := os.ReadFile("testdata/debug_rnglists")
+	if err != nil {
+		t.Fatalf("could not read test data: %v", err)
+	}
+
+	d := &Data{}
+	d.order = binary.LittleEndian
+	if err := d.AddSection(".debug_rnglists", rngLists); err != nil {
+		t.Fatal(err)
+	}
+	u := &unit{
+		asize: 8,
+		vers:  5,
+		is64:  true,
+	}
+	ret, err := d.dwarf5Ranges(u, nil, 0x5fbd, 0xc, [][2]uint64{})
+	if err != nil {
+		t.Fatalf("could not read rnglist: %v", err)
+	}
+	t.Logf("%#v", ret)
+
+	tgt := [][2]uint64{{0x0000000000006712, 0x000000000000679f}, {0x00000000000067af}, {0x00000000000067b3}}
+
+	if reflect.DeepEqual(ret, tgt) {
+		t.Errorf("expected %#v got %#x", tgt, ret)
+	}
+}
diff --git a/src/debug/dwarf/entry.go b/src/debug/dwarf/entry.go
new file mode 100644
index 0000000..9f5ac57
--- /dev/null
+++ b/src/debug/dwarf/entry.go
@@ -0,0 +1,1210 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// DWARF debug information entry parser.
+// An entry is a sequence of data items of a given format.
+// The first word in the entry is an index into what DWARF
+// calls the ``abbreviation table.''  An abbreviation is really
+// just a type descriptor: it's an array of attribute tag/value format pairs.
+
+package dwarf
+
+import (
+	"encoding/binary"
+	"errors"
+	"strconv"
+)
+
+// a single entry's description: a sequence of attributes
+type abbrev struct {
+	tag      Tag
+	children bool
+	field    []afield
+}
+
+type afield struct {
+	attr  Attr
+	fmt   format
+	class Class
+	val   int64 // for formImplicitConst
+}
+
+// a map from entry format ids to their descriptions
+type abbrevTable map[uint32]abbrev
+
+// ParseAbbrev returns the abbreviation table that starts at byte off
+// in the .debug_abbrev section.
+func (d *Data) parseAbbrev(off uint64, vers int) (abbrevTable, error) {
+	if m, ok := d.abbrevCache[off]; ok {
+		return m, nil
+	}
+
+	data := d.abbrev
+	if off > uint64(len(data)) {
+		data = nil
+	} else {
+		data = data[off:]
+	}
+	b := makeBuf(d, unknownFormat{}, "abbrev", 0, data)
+
+	// Error handling is simplified by the buf getters
+	// returning an endless stream of 0s after an error.
+	m := make(abbrevTable)
+	for {
+		// Table ends with id == 0.
+		id := uint32(b.uint())
+		if id == 0 {
+			break
+		}
+
+		// Walk over attributes, counting.
+		n := 0
+		b1 := b // Read from copy of b.
+		b1.uint()
+		b1.uint8()
+		for {
+			tag := b1.uint()
+			fmt := b1.uint()
+			if tag == 0 && fmt == 0 {
+				break
+			}
+			if format(fmt) == formImplicitConst {
+				b1.int()
+			}
+			n++
+		}
+		if b1.err != nil {
+			return nil, b1.err
+		}
+
+		// Walk over attributes again, this time writing them down.
+		var a abbrev
+		a.tag = Tag(b.uint())
+		a.children = b.uint8() != 0
+		a.field = make([]afield, n)
+		for i := range a.field {
+			a.field[i].attr = Attr(b.uint())
+			a.field[i].fmt = format(b.uint())
+			a.field[i].class = formToClass(a.field[i].fmt, a.field[i].attr, vers, &b)
+			if a.field[i].fmt == formImplicitConst {
+				a.field[i].val = b.int()
+			}
+		}
+		b.uint()
+		b.uint()
+
+		m[id] = a
+	}
+	if b.err != nil {
+		return nil, b.err
+	}
+	d.abbrevCache[off] = m
+	return m, nil
+}
+
+// attrIsExprloc indicates attributes that allow exprloc values that
+// are encoded as block values in DWARF 2 and 3. See DWARF 4, Figure
+// 20.
+var attrIsExprloc = map[Attr]bool{
+	AttrLocation:      true,
+	AttrByteSize:      true,
+	AttrBitOffset:     true,
+	AttrBitSize:       true,
+	AttrStringLength:  true,
+	AttrLowerBound:    true,
+	AttrReturnAddr:    true,
+	AttrStrideSize:    true,
+	AttrUpperBound:    true,
+	AttrCount:         true,
+	AttrDataMemberLoc: true,
+	AttrFrameBase:     true,
+	AttrSegment:       true,
+	AttrStaticLink:    true,
+	AttrUseLocation:   true,
+	AttrVtableElemLoc: true,
+	AttrAllocated:     true,
+	AttrAssociated:    true,
+	AttrDataLocation:  true,
+	AttrStride:        true,
+}
+
+// attrPtrClass indicates the *ptr class of attributes that have
+// encoding formSecOffset in DWARF 4 or formData* in DWARF 2 and 3.
+var attrPtrClass = map[Attr]Class{
+	AttrLocation:      ClassLocListPtr,
+	AttrStmtList:      ClassLinePtr,
+	AttrStringLength:  ClassLocListPtr,
+	AttrReturnAddr:    ClassLocListPtr,
+	AttrStartScope:    ClassRangeListPtr,
+	AttrDataMemberLoc: ClassLocListPtr,
+	AttrFrameBase:     ClassLocListPtr,
+	AttrMacroInfo:     ClassMacPtr,
+	AttrSegment:       ClassLocListPtr,
+	AttrStaticLink:    ClassLocListPtr,
+	AttrUseLocation:   ClassLocListPtr,
+	AttrVtableElemLoc: ClassLocListPtr,
+	AttrRanges:        ClassRangeListPtr,
+	// The following are new in DWARF 5.
+	AttrStrOffsetsBase: ClassStrOffsetsPtr,
+	AttrAddrBase:       ClassAddrPtr,
+	AttrRnglistsBase:   ClassRngListsPtr,
+	AttrLoclistsBase:   ClassLocListPtr,
+}
+
+// formToClass returns the DWARF 4 Class for the given form. If the
+// DWARF version is less then 4, it will disambiguate some forms
+// depending on the attribute.
+func formToClass(form format, attr Attr, vers int, b *buf) Class {
+	switch form {
+	default:
+		b.error("cannot determine class of unknown attribute form")
+		return 0
+
+	case formIndirect:
+		return ClassUnknown
+
+	case formAddr, formAddrx, formAddrx1, formAddrx2, formAddrx3, formAddrx4:
+		return ClassAddress
+
+	case formDwarfBlock1, formDwarfBlock2, formDwarfBlock4, formDwarfBlock:
+		// In DWARF 2 and 3, ClassExprLoc was encoded as a
+		// block. DWARF 4 distinguishes ClassBlock and
+		// ClassExprLoc, but there are no attributes that can
+		// be both, so we also promote ClassBlock values in
+		// DWARF 4 that should be ClassExprLoc in case
+		// producers get this wrong.
+		if attrIsExprloc[attr] {
+			return ClassExprLoc
+		}
+		return ClassBlock
+
+	case formData1, formData2, formData4, formData8, formSdata, formUdata, formData16, formImplicitConst:
+		// In DWARF 2 and 3, ClassPtr was encoded as a
+		// constant. Unlike ClassExprLoc/ClassBlock, some
+		// DWARF 4 attributes need to distinguish Class*Ptr
+		// from ClassConstant, so we only do this promotion
+		// for versions 2 and 3.
+		if class, ok := attrPtrClass[attr]; vers < 4 && ok {
+			return class
+		}
+		return ClassConstant
+
+	case formFlag, formFlagPresent:
+		return ClassFlag
+
+	case formRefAddr, formRef1, formRef2, formRef4, formRef8, formRefUdata, formRefSup4, formRefSup8:
+		return ClassReference
+
+	case formRefSig8:
+		return ClassReferenceSig
+
+	case formString, formStrp, formStrx, formStrpSup, formLineStrp, formStrx1, formStrx2, formStrx3, formStrx4:
+		return ClassString
+
+	case formSecOffset:
+		// DWARF 4 defines four *ptr classes, but doesn't
+		// distinguish them in the encoding. Disambiguate
+		// these classes using the attribute.
+		if class, ok := attrPtrClass[attr]; ok {
+			return class
+		}
+		return ClassUnknown
+
+	case formExprloc:
+		return ClassExprLoc
+
+	case formGnuRefAlt:
+		return ClassReferenceAlt
+
+	case formGnuStrpAlt:
+		return ClassStringAlt
+
+	case formLoclistx:
+		return ClassLocList
+
+	case formRnglistx:
+		return ClassRngList
+	}
+}
+
+// An entry is a sequence of attribute/value pairs.
+type Entry struct {
+	Offset   Offset // offset of Entry in DWARF info
+	Tag      Tag    // tag (kind of Entry)
+	Children bool   // whether Entry is followed by children
+	Field    []Field
+}
+
+// A Field is a single attribute/value pair in an Entry.
+//
+// A value can be one of several "attribute classes" defined by DWARF.
+// The Go types corresponding to each class are:
+//
+//    DWARF class       Go type        Class
+//    -----------       -------        -----
+//    address           uint64         ClassAddress
+//    block             []byte         ClassBlock
+//    constant          int64          ClassConstant
+//    flag              bool           ClassFlag
+//    reference
+//      to info         dwarf.Offset   ClassReference
+//      to type unit    uint64         ClassReferenceSig
+//    string            string         ClassString
+//    exprloc           []byte         ClassExprLoc
+//    lineptr           int64          ClassLinePtr
+//    loclistptr        int64          ClassLocListPtr
+//    macptr            int64          ClassMacPtr
+//    rangelistptr      int64          ClassRangeListPtr
+//
+// For unrecognized or vendor-defined attributes, Class may be
+// ClassUnknown.
+type Field struct {
+	Attr  Attr
+	Val   interface{}
+	Class Class
+}
+
+// A Class is the DWARF 4 class of an attribute value.
+//
+// In general, a given attribute's value may take on one of several
+// possible classes defined by DWARF, each of which leads to a
+// slightly different interpretation of the attribute.
+//
+// DWARF version 4 distinguishes attribute value classes more finely
+// than previous versions of DWARF. The reader will disambiguate
+// coarser classes from earlier versions of DWARF into the appropriate
+// DWARF 4 class. For example, DWARF 2 uses "constant" for constants
+// as well as all types of section offsets, but the reader will
+// canonicalize attributes in DWARF 2 files that refer to section
+// offsets to one of the Class*Ptr classes, even though these classes
+// were only defined in DWARF 3.
+type Class int
+
+const (
+	// ClassUnknown represents values of unknown DWARF class.
+	ClassUnknown Class = iota
+
+	// ClassAddress represents values of type uint64 that are
+	// addresses on the target machine.
+	ClassAddress
+
+	// ClassBlock represents values of type []byte whose
+	// interpretation depends on the attribute.
+	ClassBlock
+
+	// ClassConstant represents values of type int64 that are
+	// constants. The interpretation of this constant depends on
+	// the attribute.
+	ClassConstant
+
+	// ClassExprLoc represents values of type []byte that contain
+	// an encoded DWARF expression or location description.
+	ClassExprLoc
+
+	// ClassFlag represents values of type bool.
+	ClassFlag
+
+	// ClassLinePtr represents values that are an int64 offset
+	// into the "line" section.
+	ClassLinePtr
+
+	// ClassLocListPtr represents values that are an int64 offset
+	// into the "loclist" section.
+	ClassLocListPtr
+
+	// ClassMacPtr represents values that are an int64 offset into
+	// the "mac" section.
+	ClassMacPtr
+
+	// ClassRangeListPtr represents values that are an int64 offset into
+	// the "rangelist" section.
+	ClassRangeListPtr
+
+	// ClassReference represents values that are an Offset offset
+	// of an Entry in the info section (for use with Reader.Seek).
+	// The DWARF specification combines ClassReference and
+	// ClassReferenceSig into class "reference".
+	ClassReference
+
+	// ClassReferenceSig represents values that are a uint64 type
+	// signature referencing a type Entry.
+	ClassReferenceSig
+
+	// ClassString represents values that are strings. If the
+	// compilation unit specifies the AttrUseUTF8 flag (strongly
+	// recommended), the string value will be encoded in UTF-8.
+	// Otherwise, the encoding is unspecified.
+	ClassString
+
+	// ClassReferenceAlt represents values of type int64 that are
+	// an offset into the DWARF "info" section of an alternate
+	// object file.
+	ClassReferenceAlt
+
+	// ClassStringAlt represents values of type int64 that are an
+	// offset into the DWARF string section of an alternate object
+	// file.
+	ClassStringAlt
+
+	// ClassAddrPtr represents values that are an int64 offset
+	// into the "addr" section.
+	ClassAddrPtr
+
+	// ClassLocList represents values that are an int64 offset
+	// into the "loclists" section.
+	ClassLocList
+
+	// ClassRngList represents values that are a uint64 offset
+	// from the base of the "rnglists" section.
+	ClassRngList
+
+	// ClassRngListsPtr represents values that are an int64 offset
+	// into the "rnglists" section. These are used as the base for
+	// ClassRngList values.
+	ClassRngListsPtr
+
+	// ClassStrOffsetsPtr represents values that are an int64
+	// offset into the "str_offsets" section.
+	ClassStrOffsetsPtr
+)
+
+//go:generate stringer -type=Class
+
+func (i Class) GoString() string {
+	return "dwarf." + i.String()
+}
+
+// Val returns the value associated with attribute Attr in Entry,
+// or nil if there is no such attribute.
+//
+// A common idiom is to merge the check for nil return with
+// the check that the value has the expected dynamic type, as in:
+//	v, ok := e.Val(AttrSibling).(int64)
+//
+func (e *Entry) Val(a Attr) interface{} {
+	if f := e.AttrField(a); f != nil {
+		return f.Val
+	}
+	return nil
+}
+
+// AttrField returns the Field associated with attribute Attr in
+// Entry, or nil if there is no such attribute.
+func (e *Entry) AttrField(a Attr) *Field {
+	for i, f := range e.Field {
+		if f.Attr == a {
+			return &e.Field[i]
+		}
+	}
+	return nil
+}
+
+// An Offset represents the location of an Entry within the DWARF info.
+// (See Reader.Seek.)
+type Offset uint32
+
+// Entry reads a single entry from buf, decoding
+// according to the given abbreviation table.
+func (b *buf) entry(cu *Entry, atab abbrevTable, ubase Offset, vers int) *Entry {
+	off := b.off
+	id := uint32(b.uint())
+	if id == 0 {
+		return &Entry{}
+	}
+	a, ok := atab[id]
+	if !ok {
+		b.error("unknown abbreviation table index")
+		return nil
+	}
+	e := &Entry{
+		Offset:   off,
+		Tag:      a.tag,
+		Children: a.children,
+		Field:    make([]Field, len(a.field)),
+	}
+
+	// If we are currently parsing the compilation unit,
+	// we can't evaluate Addrx or Strx until we've seen the
+	// relevant base entry.
+	type delayed struct {
+		idx int
+		off uint64
+		fmt format
+	}
+	var delay []delayed
+
+	resolveStrx := func(strBase, off uint64) string {
+		off += strBase
+		if uint64(int(off)) != off {
+			b.error("DW_FORM_strx offset out of range")
+		}
+
+		b1 := makeBuf(b.dwarf, b.format, "str_offsets", 0, b.dwarf.strOffsets)
+		b1.skip(int(off))
+		is64, _ := b.format.dwarf64()
+		if is64 {
+			off = b1.uint64()
+		} else {
+			off = uint64(b1.uint32())
+		}
+		if b1.err != nil {
+			b.err = b1.err
+			return ""
+		}
+		if uint64(int(off)) != off {
+			b.error("DW_FORM_strx indirect offset out of range")
+		}
+		b1 = makeBuf(b.dwarf, b.format, "str", 0, b.dwarf.str)
+		b1.skip(int(off))
+		val := b1.string()
+		if b1.err != nil {
+			b.err = b1.err
+		}
+		return val
+	}
+
+	resolveRnglistx := func(rnglistsBase, off uint64) uint64 {
+		is64, _ := b.format.dwarf64()
+		if is64 {
+			off *= 8
+		} else {
+			off *= 4
+		}
+		off += rnglistsBase
+		if uint64(int(off)) != off {
+			b.error("DW_FORM_rnglistx offset out of range")
+		}
+
+		b1 := makeBuf(b.dwarf, b.format, "rnglists", 0, b.dwarf.rngLists)
+		b1.skip(int(off))
+		if is64 {
+			off = b1.uint64()
+		} else {
+			off = uint64(b1.uint32())
+		}
+		if b1.err != nil {
+			b.err = b1.err
+			return 0
+		}
+		if uint64(int(off)) != off {
+			b.error("DW_FORM_rnglistx indirect offset out of range")
+		}
+		return rnglistsBase + off
+	}
+
+	for i := range e.Field {
+		e.Field[i].Attr = a.field[i].attr
+		e.Field[i].Class = a.field[i].class
+		fmt := a.field[i].fmt
+		if fmt == formIndirect {
+			fmt = format(b.uint())
+			e.Field[i].Class = formToClass(fmt, a.field[i].attr, vers, b)
+		}
+		var val interface{}
+		switch fmt {
+		default:
+			b.error("unknown entry attr format 0x" + strconv.FormatInt(int64(fmt), 16))
+
+		// address
+		case formAddr:
+			val = b.addr()
+		case formAddrx, formAddrx1, formAddrx2, formAddrx3, formAddrx4:
+			var off uint64
+			switch fmt {
+			case formAddrx:
+				off = b.uint()
+			case formAddrx1:
+				off = uint64(b.uint8())
+			case formAddrx2:
+				off = uint64(b.uint16())
+			case formAddrx3:
+				off = uint64(b.uint24())
+			case formAddrx4:
+				off = uint64(b.uint32())
+			}
+			if b.dwarf.addr == nil {
+				b.error("DW_FORM_addrx with no .debug_addr section")
+			}
+			if b.err != nil {
+				return nil
+			}
+
+			// We have to adjust by the offset of the
+			// compilation unit. This won't work if the
+			// program uses Reader.Seek to skip over the
+			// unit. Not much we can do about that.
+			var addrBase int64
+			if cu != nil {
+				addrBase, _ = cu.Val(AttrAddrBase).(int64)
+			} else if a.tag == TagCompileUnit {
+				delay = append(delay, delayed{i, off, formAddrx})
+				break
+			}
+
+			var err error
+			val, err = b.dwarf.debugAddr(b.format, uint64(addrBase), off)
+			if err != nil {
+				if b.err == nil {
+					b.err = err
+				}
+				return nil
+			}
+
+		// block
+		case formDwarfBlock1:
+			val = b.bytes(int(b.uint8()))
+		case formDwarfBlock2:
+			val = b.bytes(int(b.uint16()))
+		case formDwarfBlock4:
+			val = b.bytes(int(b.uint32()))
+		case formDwarfBlock:
+			val = b.bytes(int(b.uint()))
+
+		// constant
+		case formData1:
+			val = int64(b.uint8())
+		case formData2:
+			val = int64(b.uint16())
+		case formData4:
+			val = int64(b.uint32())
+		case formData8:
+			val = int64(b.uint64())
+		case formData16:
+			val = b.bytes(16)
+		case formSdata:
+			val = int64(b.int())
+		case formUdata:
+			val = int64(b.uint())
+		case formImplicitConst:
+			val = a.field[i].val
+
+		// flag
+		case formFlag:
+			val = b.uint8() == 1
+		// New in DWARF 4.
+		case formFlagPresent:
+			// The attribute is implicitly indicated as present, and no value is
+			// encoded in the debugging information entry itself.
+			val = true
+
+		// reference to other entry
+		case formRefAddr:
+			vers := b.format.version()
+			if vers == 0 {
+				b.error("unknown version for DW_FORM_ref_addr")
+			} else if vers == 2 {
+				val = Offset(b.addr())
+			} else {
+				is64, known := b.format.dwarf64()
+				if !known {
+					b.error("unknown size for DW_FORM_ref_addr")
+				} else if is64 {
+					val = Offset(b.uint64())
+				} else {
+					val = Offset(b.uint32())
+				}
+			}
+		case formRef1:
+			val = Offset(b.uint8()) + ubase
+		case formRef2:
+			val = Offset(b.uint16()) + ubase
+		case formRef4:
+			val = Offset(b.uint32()) + ubase
+		case formRef8:
+			val = Offset(b.uint64()) + ubase
+		case formRefUdata:
+			val = Offset(b.uint()) + ubase
+
+		// string
+		case formString:
+			val = b.string()
+		case formStrp, formLineStrp:
+			var off uint64 // offset into .debug_str
+			is64, known := b.format.dwarf64()
+			if !known {
+				b.error("unknown size for DW_FORM_strp/line_strp")
+			} else if is64 {
+				off = b.uint64()
+			} else {
+				off = uint64(b.uint32())
+			}
+			if uint64(int(off)) != off {
+				b.error("DW_FORM_strp/line_strp offset out of range")
+			}
+			if b.err != nil {
+				return nil
+			}
+			var b1 buf
+			if fmt == formStrp {
+				b1 = makeBuf(b.dwarf, b.format, "str", 0, b.dwarf.str)
+			} else {
+				if len(b.dwarf.lineStr) == 0 {
+					b.error("DW_FORM_line_strp with no .debug_line_str section")
+				}
+				b1 = makeBuf(b.dwarf, b.format, "line_str", 0, b.dwarf.lineStr)
+			}
+			b1.skip(int(off))
+			val = b1.string()
+			if b1.err != nil {
+				b.err = b1.err
+				return nil
+			}
+		case formStrx, formStrx1, formStrx2, formStrx3, formStrx4:
+			var off uint64
+			switch fmt {
+			case formStrx:
+				off = b.uint()
+			case formStrx1:
+				off = uint64(b.uint8())
+			case formStrx2:
+				off = uint64(b.uint16())
+			case formStrx3:
+				off = uint64(b.uint24())
+			case formStrx4:
+				off = uint64(b.uint32())
+			}
+			if len(b.dwarf.strOffsets) == 0 {
+				b.error("DW_FORM_strx with no .debug_str_offsets section")
+			}
+			is64, known := b.format.dwarf64()
+			if !known {
+				b.error("unknown offset size for DW_FORM_strx")
+			}
+			if b.err != nil {
+				return nil
+			}
+			if is64 {
+				off *= 8
+			} else {
+				off *= 4
+			}
+
+			// We have to adjust by the offset of the
+			// compilation unit. This won't work if the
+			// program uses Reader.Seek to skip over the
+			// unit. Not much we can do about that.
+			var strBase int64
+			if cu != nil {
+				strBase, _ = cu.Val(AttrStrOffsetsBase).(int64)
+			} else if a.tag == TagCompileUnit {
+				delay = append(delay, delayed{i, off, formStrx})
+				break
+			}
+
+			val = resolveStrx(uint64(strBase), off)
+
+		case formStrpSup:
+			is64, known := b.format.dwarf64()
+			if !known {
+				b.error("unknown size for DW_FORM_strp_sup")
+			} else if is64 {
+				val = b.uint64()
+			} else {
+				val = b.uint32()
+			}
+
+		// lineptr, loclistptr, macptr, rangelistptr
+		// New in DWARF 4, but clang can generate them with -gdwarf-2.
+		// Section reference, replacing use of formData4 and formData8.
+		case formSecOffset, formGnuRefAlt, formGnuStrpAlt:
+			is64, known := b.format.dwarf64()
+			if !known {
+				b.error("unknown size for form 0x" + strconv.FormatInt(int64(fmt), 16))
+			} else if is64 {
+				val = int64(b.uint64())
+			} else {
+				val = int64(b.uint32())
+			}
+
+		// exprloc
+		// New in DWARF 4.
+		case formExprloc:
+			val = b.bytes(int(b.uint()))
+
+		// reference
+		// New in DWARF 4.
+		case formRefSig8:
+			// 64-bit type signature.
+			val = b.uint64()
+		case formRefSup4:
+			val = b.uint32()
+		case formRefSup8:
+			val = b.uint64()
+
+		// loclist
+		case formLoclistx:
+			val = b.uint()
+
+		// rnglist
+		case formRnglistx:
+			off := b.uint()
+
+			// We have to adjust by the rnglists_base of
+			// the compilation unit. This won't work if
+			// the program uses Reader.Seek to skip over
+			// the unit. Not much we can do about that.
+			var rnglistsBase int64
+			if cu != nil {
+				rnglistsBase, _ = cu.Val(AttrRnglistsBase).(int64)
+			} else if a.tag == TagCompileUnit {
+				delay = append(delay, delayed{i, off, formRnglistx})
+				break
+			}
+
+			val = resolveRnglistx(uint64(rnglistsBase), off)
+		}
+
+		e.Field[i].Val = val
+	}
+	if b.err != nil {
+		return nil
+	}
+
+	for _, del := range delay {
+		switch del.fmt {
+		case formAddrx:
+			addrBase, _ := e.Val(AttrAddrBase).(int64)
+			val, err := b.dwarf.debugAddr(b.format, uint64(addrBase), del.off)
+			if err != nil {
+				b.err = err
+				return nil
+			}
+			e.Field[del.idx].Val = val
+		case formStrx:
+			strBase, _ := e.Val(AttrStrOffsetsBase).(int64)
+			e.Field[del.idx].Val = resolveStrx(uint64(strBase), del.off)
+			if b.err != nil {
+				return nil
+			}
+		case formRnglistx:
+			rnglistsBase, _ := e.Val(AttrRnglistsBase).(int64)
+			e.Field[del.idx].Val = resolveRnglistx(uint64(rnglistsBase), del.off)
+			if b.err != nil {
+				return nil
+			}
+		}
+	}
+
+	return e
+}
+
+// A Reader allows reading Entry structures from a DWARF ``info'' section.
+// The Entry structures are arranged in a tree. The Reader's Next function
+// return successive entries from a pre-order traversal of the tree.
+// If an entry has children, its Children field will be true, and the children
+// follow, terminated by an Entry with Tag 0.
+type Reader struct {
+	b            buf
+	d            *Data
+	err          error
+	unit         int
+	lastUnit     bool   // set if last entry returned by Next is TagCompileUnit/TagPartialUnit
+	lastChildren bool   // .Children of last entry returned by Next
+	lastSibling  Offset // .Val(AttrSibling) of last entry returned by Next
+	cu           *Entry // current compilation unit
+}
+
+// Reader returns a new Reader for Data.
+// The reader is positioned at byte offset 0 in the DWARF ``info'' section.
+func (d *Data) Reader() *Reader {
+	r := &Reader{d: d}
+	r.Seek(0)
+	return r
+}
+
+// AddressSize returns the size in bytes of addresses in the current compilation
+// unit.
+func (r *Reader) AddressSize() int {
+	return r.d.unit[r.unit].asize
+}
+
+// ByteOrder returns the byte order in the current compilation unit.
+func (r *Reader) ByteOrder() binary.ByteOrder {
+	return r.b.order
+}
+
+// Seek positions the Reader at offset off in the encoded entry stream.
+// Offset 0 can be used to denote the first entry.
+func (r *Reader) Seek(off Offset) {
+	d := r.d
+	r.err = nil
+	r.lastChildren = false
+	if off == 0 {
+		if len(d.unit) == 0 {
+			return
+		}
+		u := &d.unit[0]
+		r.unit = 0
+		r.b = makeBuf(r.d, u, "info", u.off, u.data)
+		r.cu = nil
+		return
+	}
+
+	i := d.offsetToUnit(off)
+	if i == -1 {
+		r.err = errors.New("offset out of range")
+		return
+	}
+	if i != r.unit {
+		r.cu = nil
+	}
+	u := &d.unit[i]
+	r.unit = i
+	r.b = makeBuf(r.d, u, "info", off, u.data[off-u.off:])
+}
+
+// maybeNextUnit advances to the next unit if this one is finished.
+func (r *Reader) maybeNextUnit() {
+	for len(r.b.data) == 0 && r.unit+1 < len(r.d.unit) {
+		r.nextUnit()
+	}
+}
+
+// nextUnit advances to the next unit.
+func (r *Reader) nextUnit() {
+	r.unit++
+	u := &r.d.unit[r.unit]
+	r.b = makeBuf(r.d, u, "info", u.off, u.data)
+	r.cu = nil
+}
+
+// Next reads the next entry from the encoded entry stream.
+// It returns nil, nil when it reaches the end of the section.
+// It returns an error if the current offset is invalid or the data at the
+// offset cannot be decoded as a valid Entry.
+func (r *Reader) Next() (*Entry, error) {
+	if r.err != nil {
+		return nil, r.err
+	}
+	r.maybeNextUnit()
+	if len(r.b.data) == 0 {
+		return nil, nil
+	}
+	u := &r.d.unit[r.unit]
+	e := r.b.entry(r.cu, u.atable, u.base, u.vers)
+	if r.b.err != nil {
+		r.err = r.b.err
+		return nil, r.err
+	}
+	r.lastUnit = false
+	if e != nil {
+		r.lastChildren = e.Children
+		if r.lastChildren {
+			r.lastSibling, _ = e.Val(AttrSibling).(Offset)
+		}
+		if e.Tag == TagCompileUnit || e.Tag == TagPartialUnit {
+			r.lastUnit = true
+			r.cu = e
+		}
+	} else {
+		r.lastChildren = false
+	}
+	return e, nil
+}
+
+// SkipChildren skips over the child entries associated with
+// the last Entry returned by Next. If that Entry did not have
+// children or Next has not been called, SkipChildren is a no-op.
+func (r *Reader) SkipChildren() {
+	if r.err != nil || !r.lastChildren {
+		return
+	}
+
+	// If the last entry had a sibling attribute,
+	// that attribute gives the offset of the next
+	// sibling, so we can avoid decoding the
+	// child subtrees.
+	if r.lastSibling >= r.b.off {
+		r.Seek(r.lastSibling)
+		return
+	}
+
+	if r.lastUnit && r.unit+1 < len(r.d.unit) {
+		r.nextUnit()
+		return
+	}
+
+	for {
+		e, err := r.Next()
+		if err != nil || e == nil || e.Tag == 0 {
+			break
+		}
+		if e.Children {
+			r.SkipChildren()
+		}
+	}
+}
+
+// clone returns a copy of the reader. This is used by the typeReader
+// interface.
+func (r *Reader) clone() typeReader {
+	return r.d.Reader()
+}
+
+// offset returns the current buffer offset. This is used by the
+// typeReader interface.
+func (r *Reader) offset() Offset {
+	return r.b.off
+}
+
+// SeekPC returns the Entry for the compilation unit that includes pc,
+// and positions the reader to read the children of that unit.  If pc
+// is not covered by any unit, SeekPC returns ErrUnknownPC and the
+// position of the reader is undefined.
+//
+// Because compilation units can describe multiple regions of the
+// executable, in the worst case SeekPC must search through all the
+// ranges in all the compilation units. Each call to SeekPC starts the
+// search at the compilation unit of the last call, so in general
+// looking up a series of PCs will be faster if they are sorted. If
+// the caller wishes to do repeated fast PC lookups, it should build
+// an appropriate index using the Ranges method.
+func (r *Reader) SeekPC(pc uint64) (*Entry, error) {
+	unit := r.unit
+	for i := 0; i < len(r.d.unit); i++ {
+		if unit >= len(r.d.unit) {
+			unit = 0
+		}
+		r.err = nil
+		r.lastChildren = false
+		r.unit = unit
+		r.cu = nil
+		u := &r.d.unit[unit]
+		r.b = makeBuf(r.d, u, "info", u.off, u.data)
+		e, err := r.Next()
+		if err != nil {
+			return nil, err
+		}
+		ranges, err := r.d.Ranges(e)
+		if err != nil {
+			return nil, err
+		}
+		for _, pcs := range ranges {
+			if pcs[0] <= pc && pc < pcs[1] {
+				return e, nil
+			}
+		}
+		unit++
+	}
+	return nil, ErrUnknownPC
+}
+
+// Ranges returns the PC ranges covered by e, a slice of [low,high) pairs.
+// Only some entry types, such as TagCompileUnit or TagSubprogram, have PC
+// ranges; for others, this will return nil with no error.
+func (d *Data) Ranges(e *Entry) ([][2]uint64, error) {
+	var ret [][2]uint64
+
+	low, lowOK := e.Val(AttrLowpc).(uint64)
+
+	var high uint64
+	var highOK bool
+	highField := e.AttrField(AttrHighpc)
+	if highField != nil {
+		switch highField.Class {
+		case ClassAddress:
+			high, highOK = highField.Val.(uint64)
+		case ClassConstant:
+			off, ok := highField.Val.(int64)
+			if ok {
+				high = low + uint64(off)
+				highOK = true
+			}
+		}
+	}
+
+	if lowOK && highOK {
+		ret = append(ret, [2]uint64{low, high})
+	}
+
+	var u *unit
+	if uidx := d.offsetToUnit(e.Offset); uidx >= 0 && uidx < len(d.unit) {
+		u = &d.unit[uidx]
+	}
+
+	if u != nil && u.vers >= 5 && d.rngLists != nil {
+		// DWARF version 5 and later
+		field := e.AttrField(AttrRanges)
+		if field == nil {
+			return ret, nil
+		}
+		switch field.Class {
+		case ClassRangeListPtr:
+			ranges, rangesOK := field.Val.(int64)
+			if !rangesOK {
+				return ret, nil
+			}
+			cu, base, err := d.baseAddressForEntry(e)
+			if err != nil {
+				return nil, err
+			}
+			return d.dwarf5Ranges(u, cu, base, ranges, ret)
+
+		case ClassRngList:
+			rnglist, ok := field.Val.(uint64)
+			if !ok {
+				return ret, nil
+			}
+			cu, base, err := d.baseAddressForEntry(e)
+			if err != nil {
+				return nil, err
+			}
+			return d.dwarf5Ranges(u, cu, base, int64(rnglist), ret)
+
+		default:
+			return ret, nil
+		}
+	}
+
+	// DWARF version 2 through 4
+	ranges, rangesOK := e.Val(AttrRanges).(int64)
+	if rangesOK && d.ranges != nil {
+		_, base, err := d.baseAddressForEntry(e)
+		if err != nil {
+			return nil, err
+		}
+		return d.dwarf2Ranges(u, base, ranges, ret)
+	}
+
+	return ret, nil
+}
+
+// baseAddressForEntry returns the initial base address to be used when
+// looking up the range list of entry e.
+// DWARF specifies that this should be the lowpc attribute of the enclosing
+// compilation unit, however comments in gdb/dwarf2read.c say that some
+// versions of GCC use the entrypc attribute, so we check that too.
+func (d *Data) baseAddressForEntry(e *Entry) (*Entry, uint64, error) {
+	var cu *Entry
+	if e.Tag == TagCompileUnit {
+		cu = e
+	} else {
+		i := d.offsetToUnit(e.Offset)
+		if i == -1 {
+			return nil, 0, errors.New("no unit for entry")
+		}
+		u := &d.unit[i]
+		b := makeBuf(d, u, "info", u.off, u.data)
+		cu = b.entry(nil, u.atable, u.base, u.vers)
+		if b.err != nil {
+			return nil, 0, b.err
+		}
+	}
+
+	if cuEntry, cuEntryOK := cu.Val(AttrEntrypc).(uint64); cuEntryOK {
+		return cu, cuEntry, nil
+	} else if cuLow, cuLowOK := cu.Val(AttrLowpc).(uint64); cuLowOK {
+		return cu, cuLow, nil
+	}
+
+	return cu, 0, nil
+}
+
+func (d *Data) dwarf2Ranges(u *unit, base uint64, ranges int64, ret [][2]uint64) ([][2]uint64, error) {
+	buf := makeBuf(d, u, "ranges", Offset(ranges), d.ranges[ranges:])
+	for len(buf.data) > 0 {
+		low := buf.addr()
+		high := buf.addr()
+
+		if low == 0 && high == 0 {
+			break
+		}
+
+		if low == ^uint64(0)>>uint((8-u.addrsize())*8) {
+			base = high
+		} else {
+			ret = append(ret, [2]uint64{base + low, base + high})
+		}
+	}
+
+	return ret, nil
+}
+
+// dwarf5Ranges interpets a debug_rnglists sequence, see DWARFv5 section
+// 2.17.3 (page 53).
+func (d *Data) dwarf5Ranges(u *unit, cu *Entry, base uint64, ranges int64, ret [][2]uint64) ([][2]uint64, error) {
+	var addrBase int64
+	if cu != nil {
+		addrBase, _ = cu.Val(AttrAddrBase).(int64)
+	}
+
+	buf := makeBuf(d, u, "rnglists", 0, d.rngLists)
+	buf.skip(int(ranges))
+	for {
+		opcode := buf.uint8()
+		switch opcode {
+		case rleEndOfList:
+			if buf.err != nil {
+				return nil, buf.err
+			}
+			return ret, nil
+
+		case rleBaseAddressx:
+			baseIdx := buf.uint()
+			var err error
+			base, err = d.debugAddr(u, uint64(addrBase), baseIdx)
+			if err != nil {
+				return nil, err
+			}
+
+		case rleStartxEndx:
+			startIdx := buf.uint()
+			endIdx := buf.uint()
+
+			start, err := d.debugAddr(u, uint64(addrBase), startIdx)
+			if err != nil {
+				return nil, err
+			}
+			end, err := d.debugAddr(u, uint64(addrBase), endIdx)
+			if err != nil {
+				return nil, err
+			}
+			ret = append(ret, [2]uint64{start, end})
+
+		case rleStartxLength:
+			startIdx := buf.uint()
+			len := buf.uint()
+			start, err := d.debugAddr(u, uint64(addrBase), startIdx)
+			if err != nil {
+				return nil, err
+			}
+			ret = append(ret, [2]uint64{start, start + len})
+
+		case rleOffsetPair:
+			off1 := buf.uint()
+			off2 := buf.uint()
+			ret = append(ret, [2]uint64{base + off1, base + off2})
+
+		case rleBaseAddress:
+			base = buf.addr()
+
+		case rleStartEnd:
+			start := buf.addr()
+			end := buf.addr()
+			ret = append(ret, [2]uint64{start, end})
+
+		case rleStartLength:
+			start := buf.addr()
+			len := buf.uint()
+			ret = append(ret, [2]uint64{start, start + len})
+		}
+	}
+}
+
+// debugAddr returns the address at idx in debug_addr
+func (d *Data) debugAddr(format dataFormat, addrBase, idx uint64) (uint64, error) {
+	off := idx*uint64(format.addrsize()) + addrBase
+
+	if uint64(int(off)) != off {
+		return 0, errors.New("offset out of range")
+	}
+
+	b := makeBuf(d, format, "addr", 0, d.addr)
+	b.skip(int(off))
+	val := b.addr()
+	if b.err != nil {
+		return 0, b.err
+	}
+	return val, nil
+}
diff --git a/src/debug/dwarf/entry_test.go b/src/debug/dwarf/entry_test.go
new file mode 100644
index 0000000..1f41d74
--- /dev/null
+++ b/src/debug/dwarf/entry_test.go
@@ -0,0 +1,308 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package dwarf_test
+
+import (
+	. "debug/dwarf"
+	"encoding/binary"
+	"path/filepath"
+	"reflect"
+	"testing"
+)
+
+func TestSplit(t *testing.T) {
+	// debug/dwarf doesn't (currently) support split DWARF, but
+	// the attributes that pointed to the split DWARF used to
+	// cause loading the DWARF data to fail entirely (issue
+	// #12592). Test that we can at least read the DWARF data.
+	d := elfData(t, "testdata/split.elf")
+	r := d.Reader()
+	e, err := r.Next()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if e.Tag != TagCompileUnit {
+		t.Fatalf("bad tag: have %s, want %s", e.Tag, TagCompileUnit)
+	}
+	// Check that we were able to parse the unknown section offset
+	// field, even if we can't figure out its DWARF class.
+	const AttrGNUAddrBase Attr = 0x2133
+	f := e.AttrField(AttrGNUAddrBase)
+	if _, ok := f.Val.(int64); !ok {
+		t.Fatalf("bad attribute value type: have %T, want int64", f.Val)
+	}
+	if f.Class != ClassUnknown {
+		t.Fatalf("bad class: have %s, want %s", f.Class, ClassUnknown)
+	}
+}
+
+// wantRange maps from a PC to the ranges of the compilation unit
+// containing that PC.
+type wantRange struct {
+	pc     uint64
+	ranges [][2]uint64
+}
+
+func TestReaderSeek(t *testing.T) {
+	want := []wantRange{
+		{0x40059d, [][2]uint64{{0x40059d, 0x400601}}},
+		{0x400600, [][2]uint64{{0x40059d, 0x400601}}},
+		{0x400601, [][2]uint64{{0x400601, 0x400611}}},
+		{0x4005f0, [][2]uint64{{0x40059d, 0x400601}}}, // loop test
+		{0x10, nil},
+		{0x400611, nil},
+	}
+	testRanges(t, "testdata/line-gcc.elf", want)
+
+	want = []wantRange{
+		{0x401122, [][2]uint64{{0x401122, 0x401166}}},
+		{0x401165, [][2]uint64{{0x401122, 0x401166}}},
+		{0x401166, [][2]uint64{{0x401166, 0x401179}}},
+	}
+	testRanges(t, "testdata/line-gcc-dwarf5.elf", want)
+
+	want = []wantRange{
+		{0x401130, [][2]uint64{{0x401130, 0x40117e}}},
+		{0x40117d, [][2]uint64{{0x401130, 0x40117e}}},
+		{0x40117e, nil},
+	}
+	testRanges(t, "testdata/line-clang-dwarf5.elf", want)
+}
+
+func TestRangesSection(t *testing.T) {
+	want := []wantRange{
+		{0x400500, [][2]uint64{{0x400500, 0x400549}, {0x400400, 0x400408}}},
+		{0x400400, [][2]uint64{{0x400500, 0x400549}, {0x400400, 0x400408}}},
+		{0x400548, [][2]uint64{{0x400500, 0x400549}, {0x400400, 0x400408}}},
+		{0x400407, [][2]uint64{{0x400500, 0x400549}, {0x400400, 0x400408}}},
+		{0x400408, nil},
+		{0x400449, nil},
+		{0x4003ff, nil},
+	}
+	testRanges(t, "testdata/ranges.elf", want)
+}
+
+func TestRangesRnglistx(t *testing.T) {
+	want := []wantRange{
+		{0x401000, [][2]uint64{{0x401020, 0x40102c}, {0x401000, 0x40101d}}},
+		{0x40101c, [][2]uint64{{0x401020, 0x40102c}, {0x401000, 0x40101d}}},
+		{0x40101d, nil},
+		{0x40101f, nil},
+		{0x401020, [][2]uint64{{0x401020, 0x40102c}, {0x401000, 0x40101d}}},
+		{0x40102b, [][2]uint64{{0x401020, 0x40102c}, {0x401000, 0x40101d}}},
+		{0x40102c, nil},
+	}
+	testRanges(t, "testdata/rnglistx.elf", want)
+}
+
+func testRanges(t *testing.T, name string, want []wantRange) {
+	d := elfData(t, name)
+	r := d.Reader()
+	for _, w := range want {
+		entry, err := r.SeekPC(w.pc)
+		if err != nil {
+			if w.ranges != nil {
+				t.Errorf("%s: missing Entry for %#x", name, w.pc)
+			}
+			if err != ErrUnknownPC {
+				t.Errorf("%s: expected ErrUnknownPC for %#x, got %v", name, w.pc, err)
+			}
+			continue
+		}
+
+		ranges, err := d.Ranges(entry)
+		if err != nil {
+			t.Errorf("%s: %v", name, err)
+			continue
+		}
+		if !reflect.DeepEqual(ranges, w.ranges) {
+			t.Errorf("%s: for %#x got %x, expected %x", name, w.pc, ranges, w.ranges)
+		}
+	}
+}
+
+func TestReaderRanges(t *testing.T) {
+	type subprograms []struct {
+		name   string
+		ranges [][2]uint64
+	}
+	tests := []struct {
+		filename    string
+		subprograms subprograms
+	}{
+		{
+			"testdata/line-gcc.elf",
+			subprograms{
+				{"f1", [][2]uint64{{0x40059d, 0x4005e7}}},
+				{"main", [][2]uint64{{0x4005e7, 0x400601}}},
+				{"f2", [][2]uint64{{0x400601, 0x400611}}},
+			},
+		},
+		{
+			"testdata/line-gcc-dwarf5.elf",
+			subprograms{
+				{"main", [][2]uint64{{0x401147, 0x401166}}},
+				{"f1", [][2]uint64{{0x401122, 0x401147}}},
+				{"f2", [][2]uint64{{0x401166, 0x401179}}},
+			},
+		},
+		{
+			"testdata/line-clang-dwarf5.elf",
+			subprograms{
+				{"main", [][2]uint64{{0x401130, 0x401144}}},
+				{"f1", [][2]uint64{{0x401150, 0x40117e}}},
+				{"f2", [][2]uint64{{0x401180, 0x401197}}},
+			},
+		},
+	}
+
+	for _, test := range tests {
+		d := elfData(t, test.filename)
+		subprograms := test.subprograms
+
+		r := d.Reader()
+		i := 0
+		for entry, err := r.Next(); entry != nil && err == nil; entry, err = r.Next() {
+			if entry.Tag != TagSubprogram {
+				continue
+			}
+
+			if i > len(subprograms) {
+				t.Fatalf("%s: too many subprograms (expected at most %d)", test.filename, i)
+			}
+
+			if got := entry.Val(AttrName).(string); got != subprograms[i].name {
+				t.Errorf("%s: subprogram %d name is %s, expected %s", test.filename, i, got, subprograms[i].name)
+			}
+			ranges, err := d.Ranges(entry)
+			if err != nil {
+				t.Errorf("%s: subprogram %d: %v", test.filename, i, err)
+				continue
+			}
+			if !reflect.DeepEqual(ranges, subprograms[i].ranges) {
+				t.Errorf("%s: subprogram %d ranges are %x, expected %x", test.filename, i, ranges, subprograms[i].ranges)
+			}
+			i++
+		}
+
+		if i < len(subprograms) {
+			t.Errorf("%s: saw only %d subprograms, expected %d", test.filename, i, len(subprograms))
+		}
+	}
+}
+
+func Test64Bit(t *testing.T) {
+	// I don't know how to generate a 64-bit DWARF debug
+	// compilation unit except by using XCOFF, so this is
+	// hand-written.
+	tests := []struct {
+		name      string
+		info      []byte
+		addrSize  int
+		byteOrder binary.ByteOrder
+	}{
+		{
+			"32-bit little",
+			[]byte{0x30, 0, 0, 0, // comp unit length
+				4, 0, // DWARF version 4
+				0, 0, 0, 0, // abbrev offset
+				8, // address size
+				0,
+				0, 0, 0, 0, 0, 0, 0, 0,
+				0, 0, 0, 0, 0, 0, 0, 0,
+				0, 0, 0, 0, 0, 0, 0, 0,
+				0, 0, 0, 0, 0, 0, 0, 0,
+				0, 0, 0, 0, 0, 0, 0, 0,
+			},
+			8, binary.LittleEndian,
+		},
+		{
+			"64-bit little",
+			[]byte{0xff, 0xff, 0xff, 0xff, // 64-bit DWARF
+				0x30, 0, 0, 0, 0, 0, 0, 0, // comp unit length
+				4, 0, // DWARF version 4
+				0, 0, 0, 0, 0, 0, 0, 0, // abbrev offset
+				8, // address size
+				0, 0, 0, 0, 0,
+				0, 0, 0, 0, 0, 0, 0, 0,
+				0, 0, 0, 0, 0, 0, 0, 0,
+				0, 0, 0, 0, 0, 0, 0, 0,
+				0, 0, 0, 0, 0, 0, 0, 0,
+			},
+			8, binary.LittleEndian,
+		},
+		{
+			"64-bit big",
+			[]byte{0xff, 0xff, 0xff, 0xff, // 64-bit DWARF
+				0, 0, 0, 0, 0, 0, 0, 0x30, // comp unit length
+				0, 4, // DWARF version 4
+				0, 0, 0, 0, 0, 0, 0, 0, // abbrev offset
+				8, // address size
+				0, 0, 0, 0, 0,
+				0, 0, 0, 0, 0, 0, 0, 0,
+				0, 0, 0, 0, 0, 0, 0, 0,
+				0, 0, 0, 0, 0, 0, 0, 0,
+				0, 0, 0, 0, 0, 0, 0, 0,
+			},
+			8, binary.BigEndian,
+		},
+	}
+
+	for _, test := range tests {
+		data, err := New(nil, nil, nil, test.info, nil, nil, nil, nil)
+		if err != nil {
+			t.Errorf("%s: %v", test.name, err)
+		}
+
+		r := data.Reader()
+		if r.AddressSize() != test.addrSize {
+			t.Errorf("%s: got address size %d, want %d", test.name, r.AddressSize(), test.addrSize)
+		}
+		if r.ByteOrder() != test.byteOrder {
+			t.Errorf("%s: got byte order %s, want %s", test.name, r.ByteOrder(), test.byteOrder)
+		}
+	}
+}
+
+func TestUnitIteration(t *testing.T) {
+	// Iterate over all ELF test files we have and ensure that
+	// we get the same set of compilation units skipping (method 0)
+	// and not skipping (method 1) CU children.
+	files, err := filepath.Glob(filepath.Join("testdata", "*.elf"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	for _, file := range files {
+		t.Run(file, func(t *testing.T) {
+			d := elfData(t, file)
+			var units [2][]interface{}
+			for method := range units {
+				for r := d.Reader(); ; {
+					ent, err := r.Next()
+					if err != nil {
+						t.Fatal(err)
+					}
+					if ent == nil {
+						break
+					}
+					if ent.Tag == TagCompileUnit {
+						units[method] = append(units[method], ent.Val(AttrName))
+					}
+					if method == 0 {
+						if ent.Tag != TagCompileUnit {
+							t.Fatalf("found unexpected tag %v on top level", ent.Tag)
+						}
+						r.SkipChildren()
+					}
+				}
+			}
+			t.Logf("skipping CUs:     %v", units[0])
+			t.Logf("not-skipping CUs: %v", units[1])
+			if !reflect.DeepEqual(units[0], units[1]) {
+				t.Fatal("set of CUs differ")
+			}
+		})
+	}
+}
diff --git a/src/debug/dwarf/export_test.go b/src/debug/dwarf/export_test.go
new file mode 100644
index 0000000..b8a25ff
--- /dev/null
+++ b/src/debug/dwarf/export_test.go
@@ -0,0 +1,7 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package dwarf
+
+var PathJoin = pathJoin
diff --git a/src/debug/dwarf/line.go b/src/debug/dwarf/line.go
new file mode 100644
index 0000000..c4937ca
--- /dev/null
+++ b/src/debug/dwarf/line.go
@@ -0,0 +1,848 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package dwarf
+
+import (
+	"errors"
+	"fmt"
+	"io"
+	"path"
+	"strings"
+)
+
+// A LineReader reads a sequence of LineEntry structures from a DWARF
+// "line" section for a single compilation unit. LineEntries occur in
+// order of increasing PC and each LineEntry gives metadata for the
+// instructions from that LineEntry's PC to just before the next
+// LineEntry's PC. The last entry will have its EndSequence field set.
+type LineReader struct {
+	buf buf
+
+	// Original .debug_line section data. Used by Seek.
+	section []byte
+
+	str     []byte // .debug_str
+	lineStr []byte // .debug_line_str
+
+	// Header information
+	version              uint16
+	addrsize             int
+	segmentSelectorSize  int
+	minInstructionLength int
+	maxOpsPerInstruction int
+	defaultIsStmt        bool
+	lineBase             int
+	lineRange            int
+	opcodeBase           int
+	opcodeLengths        []int
+	directories          []string
+	fileEntries          []*LineFile
+
+	programOffset Offset // section offset of line number program
+	endOffset     Offset // section offset of byte following program
+
+	initialFileEntries int // initial length of fileEntries
+
+	// Current line number program state machine registers
+	state     LineEntry // public state
+	fileIndex int       // private state
+}
+
+// A LineEntry is a row in a DWARF line table.
+type LineEntry struct {
+	// Address is the program-counter value of a machine
+	// instruction generated by the compiler. This LineEntry
+	// applies to each instruction from Address to just before the
+	// Address of the next LineEntry.
+	Address uint64
+
+	// OpIndex is the index of an operation within a VLIW
+	// instruction. The index of the first operation is 0. For
+	// non-VLIW architectures, it will always be 0. Address and
+	// OpIndex together form an operation pointer that can
+	// reference any individual operation within the instruction
+	// stream.
+	OpIndex int
+
+	// File is the source file corresponding to these
+	// instructions.
+	File *LineFile
+
+	// Line is the source code line number corresponding to these
+	// instructions. Lines are numbered beginning at 1. It may be
+	// 0 if these instructions cannot be attributed to any source
+	// line.
+	Line int
+
+	// Column is the column number within the source line of these
+	// instructions. Columns are numbered beginning at 1. It may
+	// be 0 to indicate the "left edge" of the line.
+	Column int
+
+	// IsStmt indicates that Address is a recommended breakpoint
+	// location, such as the beginning of a line, statement, or a
+	// distinct subpart of a statement.
+	IsStmt bool
+
+	// BasicBlock indicates that Address is the beginning of a
+	// basic block.
+	BasicBlock bool
+
+	// PrologueEnd indicates that Address is one (of possibly
+	// many) PCs where execution should be suspended for a
+	// breakpoint on entry to the containing function.
+	//
+	// Added in DWARF 3.
+	PrologueEnd bool
+
+	// EpilogueBegin indicates that Address is one (of possibly
+	// many) PCs where execution should be suspended for a
+	// breakpoint on exit from this function.
+	//
+	// Added in DWARF 3.
+	EpilogueBegin bool
+
+	// ISA is the instruction set architecture for these
+	// instructions. Possible ISA values should be defined by the
+	// applicable ABI specification.
+	//
+	// Added in DWARF 3.
+	ISA int
+
+	// Discriminator is an arbitrary integer indicating the block
+	// to which these instructions belong. It serves to
+	// distinguish among multiple blocks that may all have with
+	// the same source file, line, and column. Where only one
+	// block exists for a given source position, it should be 0.
+	//
+	// Added in DWARF 3.
+	Discriminator int
+
+	// EndSequence indicates that Address is the first byte after
+	// the end of a sequence of target machine instructions. If it
+	// is set, only this and the Address field are meaningful. A
+	// line number table may contain information for multiple
+	// potentially disjoint instruction sequences. The last entry
+	// in a line table should always have EndSequence set.
+	EndSequence bool
+}
+
+// A LineFile is a source file referenced by a DWARF line table entry.
+type LineFile struct {
+	Name   string
+	Mtime  uint64 // Implementation defined modification time, or 0 if unknown
+	Length int    // File length, or 0 if unknown
+}
+
+// LineReader returns a new reader for the line table of compilation
+// unit cu, which must be an Entry with tag TagCompileUnit.
+//
+// If this compilation unit has no line table, it returns nil, nil.
+func (d *Data) LineReader(cu *Entry) (*LineReader, error) {
+	if d.line == nil {
+		// No line tables available.
+		return nil, nil
+	}
+
+	// Get line table information from cu.
+	off, ok := cu.Val(AttrStmtList).(int64)
+	if !ok {
+		// cu has no line table.
+		return nil, nil
+	}
+	if off > int64(len(d.line)) {
+		return nil, errors.New("AttrStmtList value out of range")
+	}
+	// AttrCompDir is optional if all file names are absolute. Use
+	// the empty string if it's not present.
+	compDir, _ := cu.Val(AttrCompDir).(string)
+
+	// Create the LineReader.
+	u := &d.unit[d.offsetToUnit(cu.Offset)]
+	buf := makeBuf(d, u, "line", Offset(off), d.line[off:])
+	// The compilation directory is implicitly directories[0].
+	r := LineReader{
+		buf:     buf,
+		section: d.line,
+		str:     d.str,
+		lineStr: d.lineStr,
+	}
+
+	// Read the header.
+	if err := r.readHeader(compDir); err != nil {
+		return nil, err
+	}
+
+	// Initialize line reader state.
+	r.Reset()
+
+	return &r, nil
+}
+
+// readHeader reads the line number program header from r.buf and sets
+// all of the header fields in r.
+func (r *LineReader) readHeader(compDir string) error {
+	buf := &r.buf
+
+	// Read basic header fields [DWARF2 6.2.4].
+	hdrOffset := buf.off
+	unitLength, dwarf64 := buf.unitLength()
+	r.endOffset = buf.off + unitLength
+	if r.endOffset > buf.off+Offset(len(buf.data)) {
+		return DecodeError{"line", hdrOffset, fmt.Sprintf("line table end %d exceeds section size %d", r.endOffset, buf.off+Offset(len(buf.data)))}
+	}
+	r.version = buf.uint16()
+	if buf.err == nil && (r.version < 2 || r.version > 5) {
+		// DWARF goes to all this effort to make new opcodes
+		// backward-compatible, and then adds fields right in
+		// the middle of the header in new versions, so we're
+		// picky about only supporting known line table
+		// versions.
+		return DecodeError{"line", hdrOffset, fmt.Sprintf("unknown line table version %d", r.version)}
+	}
+	if r.version >= 5 {
+		r.addrsize = int(buf.uint8())
+		r.segmentSelectorSize = int(buf.uint8())
+	} else {
+		r.addrsize = buf.format.addrsize()
+		r.segmentSelectorSize = 0
+	}
+	var headerLength Offset
+	if dwarf64 {
+		headerLength = Offset(buf.uint64())
+	} else {
+		headerLength = Offset(buf.uint32())
+	}
+	r.programOffset = buf.off + headerLength
+	r.minInstructionLength = int(buf.uint8())
+	if r.version >= 4 {
+		// [DWARF4 6.2.4]
+		r.maxOpsPerInstruction = int(buf.uint8())
+	} else {
+		r.maxOpsPerInstruction = 1
+	}
+	r.defaultIsStmt = buf.uint8() != 0
+	r.lineBase = int(int8(buf.uint8()))
+	r.lineRange = int(buf.uint8())
+
+	// Validate header.
+	if buf.err != nil {
+		return buf.err
+	}
+	if r.maxOpsPerInstruction == 0 {
+		return DecodeError{"line", hdrOffset, "invalid maximum operations per instruction: 0"}
+	}
+	if r.lineRange == 0 {
+		return DecodeError{"line", hdrOffset, "invalid line range: 0"}
+	}
+
+	// Read standard opcode length table. This table starts with opcode 1.
+	r.opcodeBase = int(buf.uint8())
+	r.opcodeLengths = make([]int, r.opcodeBase)
+	for i := 1; i < r.opcodeBase; i++ {
+		r.opcodeLengths[i] = int(buf.uint8())
+	}
+
+	// Validate opcode lengths.
+	if buf.err != nil {
+		return buf.err
+	}
+	for i, length := range r.opcodeLengths {
+		if known, ok := knownOpcodeLengths[i]; ok && known != length {
+			return DecodeError{"line", hdrOffset, fmt.Sprintf("opcode %d expected to have length %d, but has length %d", i, known, length)}
+		}
+	}
+
+	if r.version < 5 {
+		// Read include directories table.
+		r.directories = []string{compDir}
+		for {
+			directory := buf.string()
+			if buf.err != nil {
+				return buf.err
+			}
+			if len(directory) == 0 {
+				break
+			}
+			if !pathIsAbs(directory) {
+				// Relative paths are implicitly relative to
+				// the compilation directory.
+				directory = pathJoin(compDir, directory)
+			}
+			r.directories = append(r.directories, directory)
+		}
+
+		// Read file name list. File numbering starts with 1,
+		// so leave the first entry nil.
+		r.fileEntries = make([]*LineFile, 1)
+		for {
+			if done, err := r.readFileEntry(); err != nil {
+				return err
+			} else if done {
+				break
+			}
+		}
+	} else {
+		dirFormat := r.readLNCTFormat()
+		c := buf.uint()
+		r.directories = make([]string, c)
+		for i := range r.directories {
+			dir, _, _, err := r.readLNCT(dirFormat, dwarf64)
+			if err != nil {
+				return err
+			}
+			r.directories[i] = dir
+		}
+		fileFormat := r.readLNCTFormat()
+		c = buf.uint()
+		r.fileEntries = make([]*LineFile, c)
+		for i := range r.fileEntries {
+			name, mtime, size, err := r.readLNCT(fileFormat, dwarf64)
+			if err != nil {
+				return err
+			}
+			r.fileEntries[i] = &LineFile{name, mtime, int(size)}
+		}
+	}
+
+	r.initialFileEntries = len(r.fileEntries)
+
+	return buf.err
+}
+
+// lnctForm is a pair of an LNCT code and a form. This represents an
+// entry in the directory name or file name description in the DWARF 5
+// line number program header.
+type lnctForm struct {
+	lnct int
+	form format
+}
+
+// readLNCTFormat reads an LNCT format description.
+func (r *LineReader) readLNCTFormat() []lnctForm {
+	c := r.buf.uint8()
+	ret := make([]lnctForm, c)
+	for i := range ret {
+		ret[i].lnct = int(r.buf.uint())
+		ret[i].form = format(r.buf.uint())
+	}
+	return ret
+}
+
+// readLNCT reads a sequence of LNCT entries and returns path information.
+func (r *LineReader) readLNCT(s []lnctForm, dwarf64 bool) (path string, mtime uint64, size uint64, err error) {
+	var dir string
+	for _, lf := range s {
+		var str string
+		var val uint64
+		switch lf.form {
+		case formString:
+			str = r.buf.string()
+		case formStrp, formLineStrp:
+			var off uint64
+			if dwarf64 {
+				off = r.buf.uint64()
+			} else {
+				off = uint64(r.buf.uint32())
+			}
+			if uint64(int(off)) != off {
+				return "", 0, 0, DecodeError{"line", r.buf.off, "strp/line_strp offset out of range"}
+			}
+			var b1 buf
+			if lf.form == formStrp {
+				b1 = makeBuf(r.buf.dwarf, r.buf.format, "str", 0, r.str)
+			} else {
+				b1 = makeBuf(r.buf.dwarf, r.buf.format, "line_str", 0, r.lineStr)
+			}
+			b1.skip(int(off))
+			str = b1.string()
+			if b1.err != nil {
+				return "", 0, 0, DecodeError{"line", r.buf.off, b1.err.Error()}
+			}
+		case formStrpSup:
+			// Supplemental sections not yet supported.
+			if dwarf64 {
+				r.buf.uint64()
+			} else {
+				r.buf.uint32()
+			}
+		case formStrx:
+			// .debug_line.dwo sections not yet supported.
+			r.buf.uint()
+		case formStrx1:
+			r.buf.uint8()
+		case formStrx2:
+			r.buf.uint16()
+		case formStrx3:
+			r.buf.uint24()
+		case formStrx4:
+			r.buf.uint32()
+		case formData1:
+			val = uint64(r.buf.uint8())
+		case formData2:
+			val = uint64(r.buf.uint16())
+		case formData4:
+			val = uint64(r.buf.uint32())
+		case formData8:
+			val = r.buf.uint64()
+		case formData16:
+			r.buf.bytes(16)
+		case formDwarfBlock:
+			r.buf.bytes(int(r.buf.uint()))
+		case formUdata:
+			val = r.buf.uint()
+		}
+
+		switch lf.lnct {
+		case lnctPath:
+			path = str
+		case lnctDirectoryIndex:
+			if val >= uint64(len(r.directories)) {
+				return "", 0, 0, DecodeError{"line", r.buf.off, "directory index out of range"}
+			}
+			dir = r.directories[val]
+		case lnctTimestamp:
+			mtime = val
+		case lnctSize:
+			size = val
+		case lnctMD5:
+			// Ignored.
+		}
+	}
+
+	if dir != "" && path != "" {
+		path = pathJoin(dir, path)
+	}
+
+	return path, mtime, size, nil
+}
+
+// readFileEntry reads a file entry from either the header or a
+// DW_LNE_define_file extended opcode and adds it to r.fileEntries. A
+// true return value indicates that there are no more entries to read.
+func (r *LineReader) readFileEntry() (bool, error) {
+	name := r.buf.string()
+	if r.buf.err != nil {
+		return false, r.buf.err
+	}
+	if len(name) == 0 {
+		return true, nil
+	}
+	off := r.buf.off
+	dirIndex := int(r.buf.uint())
+	if !pathIsAbs(name) {
+		if dirIndex >= len(r.directories) {
+			return false, DecodeError{"line", off, "directory index too large"}
+		}
+		name = pathJoin(r.directories[dirIndex], name)
+	}
+	mtime := r.buf.uint()
+	length := int(r.buf.uint())
+
+	// If this is a dynamically added path and the cursor was
+	// backed up, we may have already added this entry. Avoid
+	// updating existing line table entries in this case. This
+	// avoids an allocation and potential racy access to the slice
+	// backing store if the user called Files.
+	if len(r.fileEntries) < cap(r.fileEntries) {
+		fe := r.fileEntries[:len(r.fileEntries)+1]
+		if fe[len(fe)-1] != nil {
+			// We already processed this addition.
+			r.fileEntries = fe
+			return false, nil
+		}
+	}
+	r.fileEntries = append(r.fileEntries, &LineFile{name, mtime, length})
+	return false, nil
+}
+
+// updateFile updates r.state.File after r.fileIndex has
+// changed or r.fileEntries has changed.
+func (r *LineReader) updateFile() {
+	if r.fileIndex < len(r.fileEntries) {
+		r.state.File = r.fileEntries[r.fileIndex]
+	} else {
+		r.state.File = nil
+	}
+}
+
+// Next sets *entry to the next row in this line table and moves to
+// the next row. If there are no more entries and the line table is
+// properly terminated, it returns io.EOF.
+//
+// Rows are always in order of increasing entry.Address, but
+// entry.Line may go forward or backward.
+func (r *LineReader) Next(entry *LineEntry) error {
+	if r.buf.err != nil {
+		return r.buf.err
+	}
+
+	// Execute opcodes until we reach an opcode that emits a line
+	// table entry.
+	for {
+		if len(r.buf.data) == 0 {
+			return io.EOF
+		}
+		emit := r.step(entry)
+		if r.buf.err != nil {
+			return r.buf.err
+		}
+		if emit {
+			return nil
+		}
+	}
+}
+
+// knownOpcodeLengths gives the opcode lengths (in varint arguments)
+// of known standard opcodes.
+var knownOpcodeLengths = map[int]int{
+	lnsCopy:             0,
+	lnsAdvancePC:        1,
+	lnsAdvanceLine:      1,
+	lnsSetFile:          1,
+	lnsNegateStmt:       0,
+	lnsSetBasicBlock:    0,
+	lnsConstAddPC:       0,
+	lnsSetPrologueEnd:   0,
+	lnsSetEpilogueBegin: 0,
+	lnsSetISA:           1,
+	// lnsFixedAdvancePC takes a uint8 rather than a varint; it's
+	// unclear what length the header is supposed to claim, so
+	// ignore it.
+}
+
+// step processes the next opcode and updates r.state. If the opcode
+// emits a row in the line table, this updates *entry and returns
+// true.
+func (r *LineReader) step(entry *LineEntry) bool {
+	opcode := int(r.buf.uint8())
+
+	if opcode >= r.opcodeBase {
+		// Special opcode [DWARF2 6.2.5.1, DWARF4 6.2.5.1]
+		adjustedOpcode := opcode - r.opcodeBase
+		r.advancePC(adjustedOpcode / r.lineRange)
+		lineDelta := r.lineBase + adjustedOpcode%r.lineRange
+		r.state.Line += lineDelta
+		goto emit
+	}
+
+	switch opcode {
+	case 0:
+		// Extended opcode [DWARF2 6.2.5.3]
+		length := Offset(r.buf.uint())
+		startOff := r.buf.off
+		opcode := r.buf.uint8()
+
+		switch opcode {
+		case lneEndSequence:
+			r.state.EndSequence = true
+			*entry = r.state
+			r.resetState()
+
+		case lneSetAddress:
+			switch r.addrsize {
+			case 1:
+				r.state.Address = uint64(r.buf.uint8())
+			case 2:
+				r.state.Address = uint64(r.buf.uint16())
+			case 4:
+				r.state.Address = uint64(r.buf.uint32())
+			case 8:
+				r.state.Address = r.buf.uint64()
+			default:
+				r.buf.error("unknown address size")
+			}
+
+		case lneDefineFile:
+			if done, err := r.readFileEntry(); err != nil {
+				r.buf.err = err
+				return false
+			} else if done {
+				r.buf.err = DecodeError{"line", startOff, "malformed DW_LNE_define_file operation"}
+				return false
+			}
+			r.updateFile()
+
+		case lneSetDiscriminator:
+			// [DWARF4 6.2.5.3]
+			r.state.Discriminator = int(r.buf.uint())
+		}
+
+		r.buf.skip(int(startOff + length - r.buf.off))
+
+		if opcode == lneEndSequence {
+			return true
+		}
+
+	// Standard opcodes [DWARF2 6.2.5.2]
+	case lnsCopy:
+		goto emit
+
+	case lnsAdvancePC:
+		r.advancePC(int(r.buf.uint()))
+
+	case lnsAdvanceLine:
+		r.state.Line += int(r.buf.int())
+
+	case lnsSetFile:
+		r.fileIndex = int(r.buf.uint())
+		r.updateFile()
+
+	case lnsSetColumn:
+		r.state.Column = int(r.buf.uint())
+
+	case lnsNegateStmt:
+		r.state.IsStmt = !r.state.IsStmt
+
+	case lnsSetBasicBlock:
+		r.state.BasicBlock = true
+
+	case lnsConstAddPC:
+		r.advancePC((255 - r.opcodeBase) / r.lineRange)
+
+	case lnsFixedAdvancePC:
+		r.state.Address += uint64(r.buf.uint16())
+
+	// DWARF3 standard opcodes [DWARF3 6.2.5.2]
+	case lnsSetPrologueEnd:
+		r.state.PrologueEnd = true
+
+	case lnsSetEpilogueBegin:
+		r.state.EpilogueBegin = true
+
+	case lnsSetISA:
+		r.state.ISA = int(r.buf.uint())
+
+	default:
+		// Unhandled standard opcode. Skip the number of
+		// arguments that the prologue says this opcode has.
+		for i := 0; i < r.opcodeLengths[opcode]; i++ {
+			r.buf.uint()
+		}
+	}
+	return false
+
+emit:
+	*entry = r.state
+	r.state.BasicBlock = false
+	r.state.PrologueEnd = false
+	r.state.EpilogueBegin = false
+	r.state.Discriminator = 0
+	return true
+}
+
+// advancePC advances "operation pointer" (the combination of Address
+// and OpIndex) in r.state by opAdvance steps.
+func (r *LineReader) advancePC(opAdvance int) {
+	opIndex := r.state.OpIndex + opAdvance
+	r.state.Address += uint64(r.minInstructionLength * (opIndex / r.maxOpsPerInstruction))
+	r.state.OpIndex = opIndex % r.maxOpsPerInstruction
+}
+
+// A LineReaderPos represents a position in a line table.
+type LineReaderPos struct {
+	// off is the current offset in the DWARF line section.
+	off Offset
+	// numFileEntries is the length of fileEntries.
+	numFileEntries int
+	// state and fileIndex are the statement machine state at
+	// offset off.
+	state     LineEntry
+	fileIndex int
+}
+
+// Tell returns the current position in the line table.
+func (r *LineReader) Tell() LineReaderPos {
+	return LineReaderPos{r.buf.off, len(r.fileEntries), r.state, r.fileIndex}
+}
+
+// Seek restores the line table reader to a position returned by Tell.
+//
+// The argument pos must have been returned by a call to Tell on this
+// line table.
+func (r *LineReader) Seek(pos LineReaderPos) {
+	r.buf.off = pos.off
+	r.buf.data = r.section[r.buf.off:r.endOffset]
+	r.fileEntries = r.fileEntries[:pos.numFileEntries]
+	r.state = pos.state
+	r.fileIndex = pos.fileIndex
+}
+
+// Reset repositions the line table reader at the beginning of the
+// line table.
+func (r *LineReader) Reset() {
+	// Reset buffer to the line number program offset.
+	r.buf.off = r.programOffset
+	r.buf.data = r.section[r.buf.off:r.endOffset]
+
+	// Reset file entries list.
+	r.fileEntries = r.fileEntries[:r.initialFileEntries]
+
+	// Reset line number program state.
+	r.resetState()
+}
+
+// resetState resets r.state to its default values
+func (r *LineReader) resetState() {
+	// Reset the state machine registers to the defaults given in
+	// [DWARF4 6.2.2].
+	r.state = LineEntry{
+		Address:       0,
+		OpIndex:       0,
+		File:          nil,
+		Line:          1,
+		Column:        0,
+		IsStmt:        r.defaultIsStmt,
+		BasicBlock:    false,
+		PrologueEnd:   false,
+		EpilogueBegin: false,
+		ISA:           0,
+		Discriminator: 0,
+	}
+	r.fileIndex = 1
+	r.updateFile()
+}
+
+// Files returns the file name table of this compilation unit as of
+// the current position in the line table. The file name table may be
+// referenced from attributes in this compilation unit such as
+// AttrDeclFile.
+//
+// Entry 0 is always nil, since file index 0 represents "no file".
+//
+// The file name table of a compilation unit is not fixed. Files
+// returns the file table as of the current position in the line
+// table. This may contain more entries than the file table at an
+// earlier position in the line table, though existing entries never
+// change.
+func (r *LineReader) Files() []*LineFile {
+	return r.fileEntries
+}
+
+// ErrUnknownPC is the error returned by LineReader.ScanPC when the
+// seek PC is not covered by any entry in the line table.
+var ErrUnknownPC = errors.New("ErrUnknownPC")
+
+// SeekPC sets *entry to the LineEntry that includes pc and positions
+// the reader on the next entry in the line table. If necessary, this
+// will seek backwards to find pc.
+//
+// If pc is not covered by any entry in this line table, SeekPC
+// returns ErrUnknownPC. In this case, *entry and the final seek
+// position are unspecified.
+//
+// Note that DWARF line tables only permit sequential, forward scans.
+// Hence, in the worst case, this takes time linear in the size of the
+// line table. If the caller wishes to do repeated fast PC lookups, it
+// should build an appropriate index of the line table.
+func (r *LineReader) SeekPC(pc uint64, entry *LineEntry) error {
+	if err := r.Next(entry); err != nil {
+		return err
+	}
+	if entry.Address > pc {
+		// We're too far. Start at the beginning of the table.
+		r.Reset()
+		if err := r.Next(entry); err != nil {
+			return err
+		}
+		if entry.Address > pc {
+			// The whole table starts after pc.
+			r.Reset()
+			return ErrUnknownPC
+		}
+	}
+
+	// Scan until we pass pc, then back up one.
+	for {
+		var next LineEntry
+		pos := r.Tell()
+		if err := r.Next(&next); err != nil {
+			if err == io.EOF {
+				return ErrUnknownPC
+			}
+			return err
+		}
+		if next.Address > pc {
+			if entry.EndSequence {
+				// pc is in a hole in the table.
+				return ErrUnknownPC
+			}
+			// entry is the desired entry. Back up the
+			// cursor to "next" and return success.
+			r.Seek(pos)
+			return nil
+		}
+		*entry = next
+	}
+}
+
+// pathIsAbs reports whether path is an absolute path (or "full path
+// name" in DWARF parlance). This is in "whatever form makes sense for
+// the host system", so this accepts both UNIX-style and DOS-style
+// absolute paths. We avoid the filepath package because we want this
+// to behave the same regardless of our host system and because we
+// don't know what system the paths came from.
+func pathIsAbs(path string) bool {
+	_, path = splitDrive(path)
+	return len(path) > 0 && (path[0] == '/' || path[0] == '\\')
+}
+
+// pathJoin joins dirname and filename. filename must be relative.
+// DWARF paths can be UNIX-style or DOS-style, so this handles both.
+func pathJoin(dirname, filename string) string {
+	if len(dirname) == 0 {
+		return filename
+	}
+	// dirname should be absolute, which means we can determine
+	// whether it's a DOS path reasonably reliably by looking for
+	// a drive letter or UNC path.
+	drive, dirname := splitDrive(dirname)
+	if drive == "" {
+		// UNIX-style path.
+		return path.Join(dirname, filename)
+	}
+	// DOS-style path.
+	drive2, filename := splitDrive(filename)
+	if drive2 != "" {
+		if !strings.EqualFold(drive, drive2) {
+			// Different drives. There's not much we can
+			// do here, so just ignore the directory.
+			return drive2 + filename
+		}
+		// Drives are the same. Ignore drive on filename.
+	}
+	if !(strings.HasSuffix(dirname, "/") || strings.HasSuffix(dirname, `\`)) && dirname != "" {
+		sep := `\`
+		if strings.HasPrefix(dirname, "/") {
+			sep = `/`
+		}
+		dirname += sep
+	}
+	return drive + dirname + filename
+}
+
+// splitDrive splits the DOS drive letter or UNC share point from
+// path, if any. path == drive + rest
+func splitDrive(path string) (drive, rest string) {
+	if len(path) >= 2 && path[1] == ':' {
+		if c := path[0]; 'a' <= c && c <= 'z' || 'A' <= c && c <= 'Z' {
+			return path[:2], path[2:]
+		}
+	}
+	if len(path) > 3 && (path[0] == '\\' || path[0] == '/') && (path[1] == '\\' || path[1] == '/') {
+		// Normalize the path so we can search for just \ below.
+		npath := strings.Replace(path, "/", `\`, -1)
+		// Get the host part, which must be non-empty.
+		slash1 := strings.IndexByte(npath[2:], '\\') + 2
+		if slash1 > 2 {
+			// Get the mount-point part, which must be non-empty.
+			slash2 := strings.IndexByte(npath[slash1+1:], '\\') + slash1 + 1
+			if slash2 > slash1 {
+				return path[:slash2], path[slash2:]
+			}
+		}
+	}
+	return "", path
+}
diff --git a/src/debug/dwarf/line_test.go b/src/debug/dwarf/line_test.go
new file mode 100644
index 0000000..9c6b6ff
--- /dev/null
+++ b/src/debug/dwarf/line_test.go
@@ -0,0 +1,391 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package dwarf_test
+
+import (
+	. "debug/dwarf"
+	"io"
+	"strings"
+	"testing"
+)
+
+var (
+	file1C = &LineFile{Name: "/home/austin/go.dev/src/debug/dwarf/testdata/line1.c"}
+	file1H = &LineFile{Name: "/home/austin/go.dev/src/debug/dwarf/testdata/line1.h"}
+	file2C = &LineFile{Name: "/home/austin/go.dev/src/debug/dwarf/testdata/line2.c"}
+)
+
+func TestLineELFGCC(t *testing.T) {
+	// Generated by:
+	//   # gcc --version | head -n1
+	//   gcc (Ubuntu 4.8.2-19ubuntu1) 4.8.2
+	//   # gcc -g -o line-gcc.elf line*.c
+
+	// Line table based on readelf --debug-dump=rawline,decodedline
+	want := []LineEntry{
+		{Address: 0x40059d, File: file1H, Line: 2, IsStmt: true},
+		{Address: 0x4005a5, File: file1H, Line: 2, IsStmt: true},
+		{Address: 0x4005b4, File: file1H, Line: 5, IsStmt: true},
+		{Address: 0x4005bd, File: file1H, Line: 6, IsStmt: true, Discriminator: 2},
+		{Address: 0x4005c7, File: file1H, Line: 5, IsStmt: true, Discriminator: 2},
+		{Address: 0x4005cb, File: file1H, Line: 5, IsStmt: false, Discriminator: 1},
+		{Address: 0x4005d1, File: file1H, Line: 7, IsStmt: true},
+		{Address: 0x4005e7, File: file1C, Line: 6, IsStmt: true},
+		{Address: 0x4005eb, File: file1C, Line: 7, IsStmt: true},
+		{Address: 0x4005f5, File: file1C, Line: 8, IsStmt: true},
+		{Address: 0x4005ff, File: file1C, Line: 9, IsStmt: true},
+		{Address: 0x400601, EndSequence: true},
+
+		{Address: 0x400601, File: file2C, Line: 4, IsStmt: true},
+		{Address: 0x400605, File: file2C, Line: 5, IsStmt: true},
+		{Address: 0x40060f, File: file2C, Line: 6, IsStmt: true},
+		{Address: 0x400611, EndSequence: true},
+	}
+	files := [][]*LineFile{{nil, file1H, file1C}, {nil, file2C}}
+
+	testLineTable(t, want, files, elfData(t, "testdata/line-gcc.elf"))
+}
+
+func TestLineGCCWindows(t *testing.T) {
+	// Generated by:
+	//   > gcc --version
+	//   gcc (tdm64-1) 4.9.2
+	//   > gcc -g -o line-gcc-win.bin line1.c C:\workdir\go\src\debug\dwarf\testdata\line2.c
+
+	toWindows := func(lf *LineFile) *LineFile {
+		lf2 := *lf
+		lf2.Name = strings.Replace(lf2.Name, "/home/austin/go.dev/", "C:\\workdir\\go\\", -1)
+		lf2.Name = strings.Replace(lf2.Name, "/", "\\", -1)
+		return &lf2
+	}
+	file1C := toWindows(file1C)
+	file1H := toWindows(file1H)
+	file2C := toWindows(file2C)
+
+	// Line table based on objdump --dwarf=rawline,decodedline
+	want := []LineEntry{
+		{Address: 0x401530, File: file1H, Line: 2, IsStmt: true},
+		{Address: 0x401538, File: file1H, Line: 5, IsStmt: true},
+		{Address: 0x401541, File: file1H, Line: 6, IsStmt: true, Discriminator: 3},
+		{Address: 0x40154b, File: file1H, Line: 5, IsStmt: true, Discriminator: 3},
+		{Address: 0x40154f, File: file1H, Line: 5, IsStmt: false, Discriminator: 1},
+		{Address: 0x401555, File: file1H, Line: 7, IsStmt: true},
+		{Address: 0x40155b, File: file1C, Line: 6, IsStmt: true},
+		{Address: 0x401563, File: file1C, Line: 6, IsStmt: true},
+		{Address: 0x401568, File: file1C, Line: 7, IsStmt: true},
+		{Address: 0x40156d, File: file1C, Line: 8, IsStmt: true},
+		{Address: 0x401572, File: file1C, Line: 9, IsStmt: true},
+		{Address: 0x401578, EndSequence: true},
+
+		{Address: 0x401580, File: file2C, Line: 4, IsStmt: true},
+		{Address: 0x401588, File: file2C, Line: 5, IsStmt: true},
+		{Address: 0x401595, File: file2C, Line: 6, IsStmt: true},
+		{Address: 0x40159b, EndSequence: true},
+	}
+	files := [][]*LineFile{{nil, file1H, file1C}, {nil, file2C}}
+
+	testLineTable(t, want, files, peData(t, "testdata/line-gcc-win.bin"))
+}
+
+func TestLineELFClang(t *testing.T) {
+	// Generated by:
+	//   # clang --version | head -n1
+	//   Ubuntu clang version 3.4-1ubuntu3 (tags/RELEASE_34/final) (based on LLVM 3.4)
+	//   # clang -g -o line-clang.elf line*.
+
+	want := []LineEntry{
+		{Address: 0x400530, File: file1C, Line: 6, IsStmt: true},
+		{Address: 0x400534, File: file1C, Line: 7, IsStmt: true, PrologueEnd: true},
+		{Address: 0x400539, File: file1C, Line: 8, IsStmt: true},
+		{Address: 0x400545, File: file1C, Line: 9, IsStmt: true},
+		{Address: 0x400550, File: file1H, Line: 2, IsStmt: true},
+		{Address: 0x400554, File: file1H, Line: 5, IsStmt: true, PrologueEnd: true},
+		{Address: 0x400568, File: file1H, Line: 6, IsStmt: true},
+		{Address: 0x400571, File: file1H, Line: 5, IsStmt: true},
+		{Address: 0x400581, File: file1H, Line: 7, IsStmt: true},
+		{Address: 0x400583, EndSequence: true},
+
+		{Address: 0x400590, File: file2C, Line: 4, IsStmt: true},
+		{Address: 0x4005a0, File: file2C, Line: 5, IsStmt: true, PrologueEnd: true},
+		{Address: 0x4005a7, File: file2C, Line: 6, IsStmt: true},
+		{Address: 0x4005b0, EndSequence: true},
+	}
+	files := [][]*LineFile{{nil, file1C, file1H}, {nil, file2C}}
+
+	testLineTable(t, want, files, elfData(t, "testdata/line-clang.elf"))
+}
+
+func TestLineRnglists(t *testing.T) {
+	// Test a newer file, generated by clang.
+	file := &LineFile{Name: "/usr/local/google/home/iant/foo.c"}
+	want := []LineEntry{
+		{Address: 0x401020, File: file, Line: 12, IsStmt: true},
+		{Address: 0x401020, File: file, Line: 13, Column: 12, IsStmt: true, PrologueEnd: true},
+		{Address: 0x401022, File: file, Line: 13, Column: 7},
+		{Address: 0x401024, File: file, Line: 17, Column: 1, IsStmt: true},
+		{Address: 0x401027, File: file, Line: 16, Column: 10, IsStmt: true},
+		{Address: 0x40102c, EndSequence: true},
+		{Address: 0x401000, File: file, Line: 2, IsStmt: true},
+		{Address: 0x401000, File: file, Line: 6, Column: 17, IsStmt: true, PrologueEnd: true},
+		{Address: 0x401002, File: file, Line: 6, Column: 3},
+		{Address: 0x401019, File: file, Line: 9, Column: 3, IsStmt: true},
+		{Address: 0x40101a, File: file, Line: 0, Column: 3},
+		{Address: 0x40101c, File: file, Line: 9, Column: 3},
+		{Address: 0x40101d, EndSequence: true},
+	}
+	files := [][]*LineFile{{file}}
+
+	testLineTable(t, want, files, elfData(t, "testdata/rnglistx.elf"))
+}
+
+func TestLineSeek(t *testing.T) {
+	d := elfData(t, "testdata/line-gcc.elf")
+
+	// Get the line table for the first CU.
+	cu, err := d.Reader().Next()
+	if err != nil {
+		t.Fatal("d.Reader().Next:", err)
+	}
+	lr, err := d.LineReader(cu)
+	if err != nil {
+		t.Fatal("d.LineReader:", err)
+	}
+
+	// Read entries forward.
+	var line LineEntry
+	var posTable []LineReaderPos
+	var table []LineEntry
+	for {
+		posTable = append(posTable, lr.Tell())
+
+		err := lr.Next(&line)
+		if err != nil {
+			if err == io.EOF {
+				break
+			}
+			t.Fatal("lr.Next:", err)
+		}
+		table = append(table, line)
+	}
+
+	// Test that Reset returns to the first line.
+	lr.Reset()
+	if err := lr.Next(&line); err != nil {
+		t.Fatal("lr.Next after Reset failed:", err)
+	} else if line != table[0] {
+		t.Fatal("lr.Next after Reset returned", line, "instead of", table[0])
+	}
+
+	// Check that entries match when seeking backward.
+	for i := len(posTable) - 1; i >= 0; i-- {
+		lr.Seek(posTable[i])
+		err := lr.Next(&line)
+		if i == len(posTable)-1 {
+			if err != io.EOF {
+				t.Fatal("expected io.EOF after seek to end, got", err)
+			}
+		} else if err != nil {
+			t.Fatal("lr.Next after seek to", posTable[i], "failed:", err)
+		} else if line != table[i] {
+			t.Fatal("lr.Next after seek to", posTable[i], "returned", line, "instead of", table[i])
+		}
+	}
+
+	// Check that seeking to a PC returns the right line.
+	if err := lr.SeekPC(table[0].Address-1, &line); err != ErrUnknownPC {
+		t.Fatalf("lr.SeekPC to %#x returned %v instead of ErrUnknownPC", table[0].Address-1, err)
+	}
+	for i, testLine := range table {
+		if testLine.EndSequence {
+			if err := lr.SeekPC(testLine.Address, &line); err != ErrUnknownPC {
+				t.Fatalf("lr.SeekPC to %#x returned %v instead of ErrUnknownPC", testLine.Address, err)
+			}
+			continue
+		}
+
+		nextPC := table[i+1].Address
+		for pc := testLine.Address; pc < nextPC; pc++ {
+			if err := lr.SeekPC(pc, &line); err != nil {
+				t.Fatalf("lr.SeekPC to %#x failed: %v", pc, err)
+			} else if line != testLine {
+				t.Fatalf("lr.SeekPC to %#x returned %v instead of %v", pc, line, testLine)
+			}
+		}
+	}
+}
+
+func testLineTable(t *testing.T, want []LineEntry, files [][]*LineFile, d *Data) {
+	// Get line table from d.
+	var got []LineEntry
+	dr := d.Reader()
+	for {
+		ent, err := dr.Next()
+		if err != nil {
+			t.Fatal("dr.Next:", err)
+		} else if ent == nil {
+			break
+		}
+
+		if ent.Tag != TagCompileUnit {
+			dr.SkipChildren()
+			continue
+		}
+
+		// Ignore system compilation units (this happens in
+		// the Windows binary). We'll still decode the line
+		// table, but won't check it.
+		name := ent.Val(AttrName).(string)
+		ignore := strings.HasPrefix(name, "C:/crossdev/") || strings.HasPrefix(name, "../../")
+
+		// Decode CU's line table.
+		lr, err := d.LineReader(ent)
+		if err != nil {
+			t.Fatal("d.LineReader:", err)
+		} else if lr == nil {
+			continue
+		}
+
+		for {
+			var line LineEntry
+			err := lr.Next(&line)
+			if err != nil {
+				if err == io.EOF {
+					break
+				}
+				t.Fatal("lr.Next:", err)
+			}
+			// Ignore sources from the Windows build environment.
+			if ignore {
+				continue
+			}
+			got = append(got, line)
+		}
+
+		// Check file table.
+		if !ignore {
+			if !compareFiles(files[0], lr.Files()) {
+				t.Log("File tables do not match. Got:")
+				dumpFiles(t, lr.Files())
+				t.Log("Want:")
+				dumpFiles(t, files[0])
+				t.Fail()
+			}
+			files = files[1:]
+		}
+	}
+
+	// Compare line tables.
+	if !compareLines(got, want) {
+		t.Log("Line tables do not match. Got:")
+		dumpLines(t, got)
+		t.Log("Want:")
+		dumpLines(t, want)
+		t.FailNow()
+	}
+}
+
+func compareFiles(a, b []*LineFile) bool {
+	if len(a) != len(b) {
+		return false
+	}
+	for i := range a {
+		if a[i] == nil && b[i] == nil {
+			continue
+		}
+		if a[i] != nil && b[i] != nil && a[i].Name == b[i].Name {
+			continue
+		}
+		return false
+	}
+	return true
+}
+
+func dumpFiles(t *testing.T, files []*LineFile) {
+	for i, f := range files {
+		name := "<nil>"
+		if f != nil {
+			name = f.Name
+		}
+		t.Logf("  %d %s", i, name)
+	}
+}
+
+func compareLines(a, b []LineEntry) bool {
+	if len(a) != len(b) {
+		return false
+	}
+
+	for i := range a {
+		al, bl := a[i], b[i]
+		// If both are EndSequence, then the only other valid
+		// field is Address. Otherwise, test equality of all
+		// fields.
+		if al.EndSequence && bl.EndSequence && al.Address == bl.Address {
+			continue
+		}
+		if al.File.Name != bl.File.Name {
+			return false
+		}
+		al.File = nil
+		bl.File = nil
+		if al != bl {
+			return false
+		}
+	}
+	return true
+}
+
+func dumpLines(t *testing.T, lines []LineEntry) {
+	for _, l := range lines {
+		t.Logf("  %+v File:%+v", l, l.File)
+	}
+}
+
+type joinTest struct {
+	dirname, filename string
+	path              string
+}
+
+var joinTests = []joinTest{
+	{"a", "b", "a/b"},
+	{"a", "", "a"},
+	{"", "b", "b"},
+	{"/a", "b", "/a/b"},
+	{"/a/", "b", "/a/b"},
+
+	{`C:\Windows\`, `System32`, `C:\Windows\System32`},
+	{`C:\Windows\`, ``, `C:\Windows\`},
+	{`C:\`, `Windows`, `C:\Windows`},
+	{`C:\Windows\`, `C:System32`, `C:\Windows\System32`},
+	{`C:\Windows`, `a/b`, `C:\Windows\a/b`},
+	{`\\host\share\`, `foo`, `\\host\share\foo`},
+	{`\\host\share\`, `foo\bar`, `\\host\share\foo\bar`},
+	{`//host/share/`, `foo/bar`, `//host/share/foo/bar`},
+
+	// Note: the Go compiler currently emits DWARF line table paths
+	// with '/' instead of '\' (see issues #19784, #36495). These
+	// tests are to cover cases that might come up for Windows Go
+	// binaries.
+	{`c:/workdir/go/src/x`, `y.go`, `c:/workdir/go/src/x/y.go`},
+	{`d:/some/thing/`, `b.go`, `d:/some/thing/b.go`},
+	{`e:\blah\`, `foo.c`, `e:\blah\foo.c`},
+
+	// The following are "best effort". We shouldn't see relative
+	// base directories in DWARF, but these test that pathJoin
+	// doesn't fail miserably if it sees one.
+	{`C:`, `a`, `C:a`},
+	{`C:`, `a\b`, `C:a\b`},
+	{`C:.`, `a`, `C:.\a`},
+	{`C:a`, `b`, `C:a\b`},
+}
+
+func TestPathJoin(t *testing.T) {
+	for _, test := range joinTests {
+		got := PathJoin(test.dirname, test.filename)
+		if test.path != got {
+			t.Errorf("pathJoin(%q, %q) = %q, want %q", test.dirname, test.filename, got, test.path)
+		}
+	}
+}
diff --git a/src/debug/dwarf/open.go b/src/debug/dwarf/open.go
new file mode 100644
index 0000000..e94103a
--- /dev/null
+++ b/src/debug/dwarf/open.go
@@ -0,0 +1,130 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package dwarf provides access to DWARF debugging information loaded from
+// executable files, as defined in the DWARF 2.0 Standard at
+// http://dwarfstd.org/doc/dwarf-2.0.0.pdf
+package dwarf
+
+import (
+	"encoding/binary"
+	"errors"
+)
+
+// Data represents the DWARF debugging information
+// loaded from an executable file (for example, an ELF or Mach-O executable).
+type Data struct {
+	// raw data
+	abbrev   []byte
+	aranges  []byte
+	frame    []byte
+	info     []byte
+	line     []byte
+	pubnames []byte
+	ranges   []byte
+	str      []byte
+
+	// New sections added in DWARF 5.
+	addr       []byte
+	lineStr    []byte
+	strOffsets []byte
+	rngLists   []byte
+
+	// parsed data
+	abbrevCache map[uint64]abbrevTable
+	bigEndian   bool
+	order       binary.ByteOrder
+	typeCache   map[Offset]Type
+	typeSigs    map[uint64]*typeUnit
+	unit        []unit
+}
+
+var errSegmentSelector = errors.New("non-zero segment_selector size not supported")
+
+// New returns a new Data object initialized from the given parameters.
+// Rather than calling this function directly, clients should typically use
+// the DWARF method of the File type of the appropriate package debug/elf,
+// debug/macho, or debug/pe.
+//
+// The []byte arguments are the data from the corresponding debug section
+// in the object file; for example, for an ELF object, abbrev is the contents of
+// the ".debug_abbrev" section.
+func New(abbrev, aranges, frame, info, line, pubnames, ranges, str []byte) (*Data, error) {
+	d := &Data{
+		abbrev:      abbrev,
+		aranges:     aranges,
+		frame:       frame,
+		info:        info,
+		line:        line,
+		pubnames:    pubnames,
+		ranges:      ranges,
+		str:         str,
+		abbrevCache: make(map[uint64]abbrevTable),
+		typeCache:   make(map[Offset]Type),
+		typeSigs:    make(map[uint64]*typeUnit),
+	}
+
+	// Sniff .debug_info to figure out byte order.
+	// 32-bit DWARF: 4 byte length, 2 byte version.
+	// 64-bit DWARf: 4 bytes of 0xff, 8 byte length, 2 byte version.
+	if len(d.info) < 6 {
+		return nil, DecodeError{"info", Offset(len(d.info)), "too short"}
+	}
+	offset := 4
+	if d.info[0] == 0xff && d.info[1] == 0xff && d.info[2] == 0xff && d.info[3] == 0xff {
+		if len(d.info) < 14 {
+			return nil, DecodeError{"info", Offset(len(d.info)), "too short"}
+		}
+		offset = 12
+	}
+	// Fetch the version, a tiny 16-bit number (1, 2, 3, 4, 5).
+	x, y := d.info[offset], d.info[offset+1]
+	switch {
+	case x == 0 && y == 0:
+		return nil, DecodeError{"info", 4, "unsupported version 0"}
+	case x == 0:
+		d.bigEndian = true
+		d.order = binary.BigEndian
+	case y == 0:
+		d.bigEndian = false
+		d.order = binary.LittleEndian
+	default:
+		return nil, DecodeError{"info", 4, "cannot determine byte order"}
+	}
+
+	u, err := d.parseUnits()
+	if err != nil {
+		return nil, err
+	}
+	d.unit = u
+	return d, nil
+}
+
+// AddTypes will add one .debug_types section to the DWARF data. A
+// typical object with DWARF version 4 debug info will have multiple
+// .debug_types sections. The name is used for error reporting only,
+// and serves to distinguish one .debug_types section from another.
+func (d *Data) AddTypes(name string, types []byte) error {
+	return d.parseTypes(name, types)
+}
+
+// AddSection adds another DWARF section by name. The name should be a
+// DWARF section name such as ".debug_addr", ".debug_str_offsets", and
+// so forth. This approach is used for new DWARF sections added in
+// DWARF 5 and later.
+func (d *Data) AddSection(name string, contents []byte) error {
+	var err error
+	switch name {
+	case ".debug_addr":
+		d.addr = contents
+	case ".debug_line_str":
+		d.lineStr = contents
+	case ".debug_str_offsets":
+		d.strOffsets = contents
+	case ".debug_rnglists":
+		d.rngLists = contents
+	}
+	// Just ignore names that we don't yet support.
+	return err
+}
diff --git a/src/debug/dwarf/tag_string.go b/src/debug/dwarf/tag_string.go
new file mode 100644
index 0000000..b79ea17
--- /dev/null
+++ b/src/debug/dwarf/tag_string.go
@@ -0,0 +1,119 @@
+// Code generated by "stringer -type Tag -trimprefix=Tag"; DO NOT EDIT.
+
+package dwarf
+
+import "strconv"
+
+func _() {
+	// An "invalid array index" compiler error signifies that the constant values have changed.
+	// Re-run the stringer command to generate them again.
+	var x [1]struct{}
+	_ = x[TagArrayType-1]
+	_ = x[TagClassType-2]
+	_ = x[TagEntryPoint-3]
+	_ = x[TagEnumerationType-4]
+	_ = x[TagFormalParameter-5]
+	_ = x[TagImportedDeclaration-8]
+	_ = x[TagLabel-10]
+	_ = x[TagLexDwarfBlock-11]
+	_ = x[TagMember-13]
+	_ = x[TagPointerType-15]
+	_ = x[TagReferenceType-16]
+	_ = x[TagCompileUnit-17]
+	_ = x[TagStringType-18]
+	_ = x[TagStructType-19]
+	_ = x[TagSubroutineType-21]
+	_ = x[TagTypedef-22]
+	_ = x[TagUnionType-23]
+	_ = x[TagUnspecifiedParameters-24]
+	_ = x[TagVariant-25]
+	_ = x[TagCommonDwarfBlock-26]
+	_ = x[TagCommonInclusion-27]
+	_ = x[TagInheritance-28]
+	_ = x[TagInlinedSubroutine-29]
+	_ = x[TagModule-30]
+	_ = x[TagPtrToMemberType-31]
+	_ = x[TagSetType-32]
+	_ = x[TagSubrangeType-33]
+	_ = x[TagWithStmt-34]
+	_ = x[TagAccessDeclaration-35]
+	_ = x[TagBaseType-36]
+	_ = x[TagCatchDwarfBlock-37]
+	_ = x[TagConstType-38]
+	_ = x[TagConstant-39]
+	_ = x[TagEnumerator-40]
+	_ = x[TagFileType-41]
+	_ = x[TagFriend-42]
+	_ = x[TagNamelist-43]
+	_ = x[TagNamelistItem-44]
+	_ = x[TagPackedType-45]
+	_ = x[TagSubprogram-46]
+	_ = x[TagTemplateTypeParameter-47]
+	_ = x[TagTemplateValueParameter-48]
+	_ = x[TagThrownType-49]
+	_ = x[TagTryDwarfBlock-50]
+	_ = x[TagVariantPart-51]
+	_ = x[TagVariable-52]
+	_ = x[TagVolatileType-53]
+	_ = x[TagDwarfProcedure-54]
+	_ = x[TagRestrictType-55]
+	_ = x[TagInterfaceType-56]
+	_ = x[TagNamespace-57]
+	_ = x[TagImportedModule-58]
+	_ = x[TagUnspecifiedType-59]
+	_ = x[TagPartialUnit-60]
+	_ = x[TagImportedUnit-61]
+	_ = x[TagMutableType-62]
+	_ = x[TagCondition-63]
+	_ = x[TagSharedType-64]
+	_ = x[TagTypeUnit-65]
+	_ = x[TagRvalueReferenceType-66]
+	_ = x[TagTemplateAlias-67]
+	_ = x[TagCoarrayType-68]
+	_ = x[TagGenericSubrange-69]
+	_ = x[TagDynamicType-70]
+	_ = x[TagAtomicType-71]
+	_ = x[TagCallSite-72]
+	_ = x[TagCallSiteParameter-73]
+	_ = x[TagSkeletonUnit-74]
+	_ = x[TagImmutableType-75]
+}
+
+const (
+	_Tag_name_0 = "ArrayTypeClassTypeEntryPointEnumerationTypeFormalParameter"
+	_Tag_name_1 = "ImportedDeclaration"
+	_Tag_name_2 = "LabelLexDwarfBlock"
+	_Tag_name_3 = "Member"
+	_Tag_name_4 = "PointerTypeReferenceTypeCompileUnitStringTypeStructType"
+	_Tag_name_5 = "SubroutineTypeTypedefUnionTypeUnspecifiedParametersVariantCommonDwarfBlockCommonInclusionInheritanceInlinedSubroutineModulePtrToMemberTypeSetTypeSubrangeTypeWithStmtAccessDeclarationBaseTypeCatchDwarfBlockConstTypeConstantEnumeratorFileTypeFriendNamelistNamelistItemPackedTypeSubprogramTemplateTypeParameterTemplateValueParameterThrownTypeTryDwarfBlockVariantPartVariableVolatileTypeDwarfProcedureRestrictTypeInterfaceTypeNamespaceImportedModuleUnspecifiedTypePartialUnitImportedUnitMutableTypeConditionSharedTypeTypeUnitRvalueReferenceTypeTemplateAliasCoarrayTypeGenericSubrangeDynamicTypeAtomicTypeCallSiteCallSiteParameterSkeletonUnitImmutableType"
+)
+
+var (
+	_Tag_index_0 = [...]uint8{0, 9, 18, 28, 43, 58}
+	_Tag_index_2 = [...]uint8{0, 5, 18}
+	_Tag_index_4 = [...]uint8{0, 11, 24, 35, 45, 55}
+	_Tag_index_5 = [...]uint16{0, 14, 21, 30, 51, 58, 74, 89, 100, 117, 123, 138, 145, 157, 165, 182, 190, 205, 214, 222, 232, 240, 246, 254, 266, 276, 286, 307, 329, 339, 352, 363, 371, 383, 397, 409, 422, 431, 445, 460, 471, 483, 494, 503, 513, 521, 540, 553, 564, 579, 590, 600, 608, 625, 637, 650}
+)
+
+func (i Tag) String() string {
+	switch {
+	case 1 <= i && i <= 5:
+		i -= 1
+		return _Tag_name_0[_Tag_index_0[i]:_Tag_index_0[i+1]]
+	case i == 8:
+		return _Tag_name_1
+	case 10 <= i && i <= 11:
+		i -= 10
+		return _Tag_name_2[_Tag_index_2[i]:_Tag_index_2[i+1]]
+	case i == 13:
+		return _Tag_name_3
+	case 15 <= i && i <= 19:
+		i -= 15
+		return _Tag_name_4[_Tag_index_4[i]:_Tag_index_4[i+1]]
+	case 21 <= i && i <= 75:
+		i -= 21
+		return _Tag_name_5[_Tag_index_5[i]:_Tag_index_5[i+1]]
+	default:
+		return "Tag(" + strconv.FormatInt(int64(i), 10) + ")"
+	}
+}
diff --git a/src/debug/dwarf/testdata/cppunsuptypes.cc b/src/debug/dwarf/testdata/cppunsuptypes.cc
new file mode 100644
index 0000000..e9281c7
--- /dev/null
+++ b/src/debug/dwarf/testdata/cppunsuptypes.cc
@@ -0,0 +1,34 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// cppunsuptypes.elf built with g++ 7.3
+//    g++ -g -c -o cppunsuptypes.elf cppunsuptypes.cc
+
+int i = 3;
+double d = 3;
+
+// anonymous reference type
+int &culprit = i;
+
+// named reference type
+typedef double &dref;
+dref dr = d;
+
+// incorporated into another type
+typedef struct {
+  dref q;
+  int &r;
+} hasrefs;
+
+hasrefs hr = { d, i };
+
+// This code is intended to trigger a DWARF "pointer to member" type DIE
+struct CS { int dm; };
+
+int foo()
+{
+  int CS::* pdm = &CS::dm;
+  CS cs = {42};
+  return cs.*pdm;
+}
diff --git a/src/debug/dwarf/testdata/cppunsuptypes.elf b/src/debug/dwarf/testdata/cppunsuptypes.elf
new file mode 100644
index 0000000..e955512
--- /dev/null
+++ b/src/debug/dwarf/testdata/cppunsuptypes.elf
diff --git a/src/debug/dwarf/testdata/cycle.c b/src/debug/dwarf/testdata/cycle.c
new file mode 100644
index 0000000..a0b53df
--- /dev/null
+++ b/src/debug/dwarf/testdata/cycle.c
@@ -0,0 +1,7 @@
+typedef struct aaa *AAA;
+typedef AAA BBB;
+struct aaa { BBB val; };
+
+AAA x(void) {
+    return (AAA)0;
+}
diff --git a/src/debug/dwarf/testdata/cycle.elf b/src/debug/dwarf/testdata/cycle.elf
new file mode 100644
index 0000000..e0b66ca
--- /dev/null
+++ b/src/debug/dwarf/testdata/cycle.elf
diff --git a/src/debug/dwarf/testdata/debug_rnglists b/src/debug/dwarf/testdata/debug_rnglists
new file mode 100644
index 0000000..985ec6c
--- /dev/null
+++ b/src/debug/dwarf/testdata/debug_rnglists
diff --git a/src/debug/dwarf/testdata/line-clang-dwarf5.elf b/src/debug/dwarf/testdata/line-clang-dwarf5.elf
new file mode 100644
index 0000000..7b80c9c
--- /dev/null
+++ b/src/debug/dwarf/testdata/line-clang-dwarf5.elf
diff --git a/src/debug/dwarf/testdata/line-clang.elf b/src/debug/dwarf/testdata/line-clang.elf
new file mode 100644
index 0000000..b63cc78
--- /dev/null
+++ b/src/debug/dwarf/testdata/line-clang.elf
diff --git a/src/debug/dwarf/testdata/line-gcc-dwarf5.elf b/src/debug/dwarf/testdata/line-gcc-dwarf5.elf
new file mode 100644
index 0000000..34ce17c
--- /dev/null
+++ b/src/debug/dwarf/testdata/line-gcc-dwarf5.elf
diff --git a/src/debug/dwarf/testdata/line-gcc-win.bin b/src/debug/dwarf/testdata/line-gcc-win.bin
new file mode 100644
index 0000000..583ad44
--- /dev/null
+++ b/src/debug/dwarf/testdata/line-gcc-win.bin
diff --git a/src/debug/dwarf/testdata/line-gcc.elf b/src/debug/dwarf/testdata/line-gcc.elf
new file mode 100644
index 0000000..50500a8
--- /dev/null
+++ b/src/debug/dwarf/testdata/line-gcc.elf
diff --git a/src/debug/dwarf/testdata/line1.c b/src/debug/dwarf/testdata/line1.c
new file mode 100644
index 0000000..f358647
--- /dev/null
+++ b/src/debug/dwarf/testdata/line1.c
@@ -0,0 +1,9 @@
+#include "line1.h"
+
+void f2();
+
+int main()
+{
+	f1();
+	f2();
+}
diff --git a/src/debug/dwarf/testdata/line1.h b/src/debug/dwarf/testdata/line1.h
new file mode 100644
index 0000000..974d4c8
--- /dev/null
+++ b/src/debug/dwarf/testdata/line1.h
@@ -0,0 +1,7 @@
+static void f1()
+{
+	char buf[10];
+	int i;
+	for(i = 0; i < 10; i++)
+		buf[i] = 1;
+}
diff --git a/src/debug/dwarf/testdata/line2.c b/src/debug/dwarf/testdata/line2.c
new file mode 100644
index 0000000..38d8998
--- /dev/null
+++ b/src/debug/dwarf/testdata/line2.c
@@ -0,0 +1,6 @@
+#include <stdio.h>
+
+void f2()
+{
+	printf("hello\n");
+}
diff --git a/src/debug/dwarf/testdata/ranges.c b/src/debug/dwarf/testdata/ranges.c
new file mode 100644
index 0000000..2f208e5
--- /dev/null
+++ b/src/debug/dwarf/testdata/ranges.c
@@ -0,0 +1,25 @@
+// gcc -g -O2 -freorder-blocks-and-partition
+
+const char *arr[10000];
+const char *hot = "hot";
+const char *cold = "cold";
+
+__attribute__((noinline))
+void fn(int path) {
+	int i;
+
+	if (path) {
+		for (i = 0; i < sizeof arr / sizeof arr[0]; i++) {
+			arr[i] = hot;
+		}
+	} else {
+		for (i = 0; i < sizeof arr / sizeof arr[0]; i++) {
+			arr[i] = cold;
+		}
+	}
+}
+
+int main(int argc, char *argv[]) {
+	fn(argc);
+	return 0;
+}
diff --git a/src/debug/dwarf/testdata/ranges.elf b/src/debug/dwarf/testdata/ranges.elf
new file mode 100755
index 0000000..7f54138
--- /dev/null
+++ b/src/debug/dwarf/testdata/ranges.elf
diff --git a/src/debug/dwarf/testdata/rnglistx.c b/src/debug/dwarf/testdata/rnglistx.c
new file mode 100644
index 0000000..8770435
--- /dev/null
+++ b/src/debug/dwarf/testdata/rnglistx.c
@@ -0,0 +1,19 @@
+// clang -gdwarf-5 -O2 -nostdlib
+
+__attribute__((noinline, cold))
+static int sum(int i) {
+  int j, s;
+
+  s = 0;
+  for (j = 0; j < i; j++) {
+    s += j * i;
+  }
+  return s;
+}
+
+int main(int argc, char** argv) {
+  if (argc == 0) {
+    return 0;
+  }
+  return sum(argc);
+}
diff --git a/src/debug/dwarf/testdata/rnglistx.elf b/src/debug/dwarf/testdata/rnglistx.elf
new file mode 100755
index 0000000..c2d7f55
--- /dev/null
+++ b/src/debug/dwarf/testdata/rnglistx.elf
diff --git a/src/debug/dwarf/testdata/split.c b/src/debug/dwarf/testdata/split.c
new file mode 100644
index 0000000..0ef3427
--- /dev/null
+++ b/src/debug/dwarf/testdata/split.c
@@ -0,0 +1,5 @@
+// gcc -gsplit-dwarf split.c -o split.elf
+
+int main() 
+{
+}
diff --git a/src/debug/dwarf/testdata/split.elf b/src/debug/dwarf/testdata/split.elf
new file mode 100644
index 0000000..99ee2c2
--- /dev/null
+++ b/src/debug/dwarf/testdata/split.elf
diff --git a/src/debug/dwarf/testdata/typedef.c b/src/debug/dwarf/testdata/typedef.c
new file mode 100644
index 0000000..4780a0b
--- /dev/null
+++ b/src/debug/dwarf/testdata/typedef.c
@@ -0,0 +1,85 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+/*
+Linux ELF:
+gcc -gdwarf-2 -m64 -c typedef.c && gcc -gdwarf-2 -m64 -o typedef.elf typedef.o
+
+OS X Mach-O:
+gcc -gdwarf-2 -m64 -c typedef.c -o typedef.macho
+*/
+#include <complex.h>
+
+typedef volatile int* t_ptr_volatile_int;
+typedef const char *t_ptr_const_char;
+typedef long t_long;
+typedef unsigned short t_ushort;
+typedef int t_func_int_of_float_double(float, double);
+typedef int (*t_ptr_func_int_of_float_double)(float, double);
+typedef int (*t_ptr_func_int_of_float_complex)(float complex);
+typedef int (*t_ptr_func_int_of_double_complex)(double complex);
+typedef int (*t_ptr_func_int_of_long_double_complex)(long double complex);
+typedef int *t_func_ptr_int_of_char_schar_uchar(char, signed char, unsigned char);
+typedef void t_func_void_of_char(char);
+typedef void t_func_void_of_void(void);
+typedef void t_func_void_of_ptr_char_dots(char*, ...);
+typedef struct my_struct {
+	volatile int vi;
+	char x : 1;
+	int y : 4;
+	int z[0];
+	long long array[40];
+	int zz[0];
+} t_my_struct;
+typedef struct my_struct1 {
+	int zz [1];
+} t_my_struct1;
+typedef union my_union {
+	volatile int vi;
+	char x : 1;
+	int y : 4;
+	long long array[40];
+} t_my_union;
+typedef enum my_enum {
+	e1 = 1,
+	e2 = 2,
+	e3 = -5,
+	e4 = 1000000000000000LL,
+} t_my_enum;
+
+typedef struct list t_my_list;
+struct list {
+	short val;
+	t_my_list *next;
+};
+
+typedef struct tree {
+	struct tree *left, *right;
+	unsigned long long val;
+} t_my_tree;
+
+t_ptr_volatile_int *a2;
+t_ptr_const_char **a3a;
+t_long *a4;
+t_ushort *a5;
+t_func_int_of_float_double *a6;
+t_ptr_func_int_of_float_double *a7;
+t_func_ptr_int_of_char_schar_uchar *a8;
+t_func_void_of_char *a9;
+t_func_void_of_void *a10;
+t_func_void_of_ptr_char_dots *a11;
+t_my_struct *a12;
+t_my_struct1 *a12a;
+t_my_union *a12b;
+t_my_enum *a13;
+t_my_list *a14;
+t_my_tree *a15;
+t_ptr_func_int_of_float_complex *a16;
+t_ptr_func_int_of_double_complex *a17;
+t_ptr_func_int_of_long_double_complex *a18;
+
+int main()
+{
+	return 0;
+}
diff --git a/src/debug/dwarf/testdata/typedef.elf b/src/debug/dwarf/testdata/typedef.elf
new file mode 100755
index 0000000..b2062d2
--- /dev/null
+++ b/src/debug/dwarf/testdata/typedef.elf
diff --git a/src/debug/dwarf/testdata/typedef.elf4 b/src/debug/dwarf/testdata/typedef.elf4
new file mode 100644
index 0000000..3d5a5a1
--- /dev/null
+++ b/src/debug/dwarf/testdata/typedef.elf4
diff --git a/src/debug/dwarf/testdata/typedef.macho b/src/debug/dwarf/testdata/typedef.macho
new file mode 100644
index 0000000..f75afcc
--- /dev/null
+++ b/src/debug/dwarf/testdata/typedef.macho
diff --git a/src/debug/dwarf/type.go b/src/debug/dwarf/type.go
new file mode 100644
index 0000000..eb5a666
--- /dev/null
+++ b/src/debug/dwarf/type.go
@@ -0,0 +1,770 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// DWARF type information structures.
+// The format is heavily biased toward C, but for simplicity
+// the String methods use a pseudo-Go syntax.
+
+package dwarf
+
+import "strconv"
+
+// A Type conventionally represents a pointer to any of the
+// specific Type structures (CharType, StructType, etc.).
+type Type interface {
+	Common() *CommonType
+	String() string
+	Size() int64
+}
+
+// A CommonType holds fields common to multiple types.
+// If a field is not known or not applicable for a given type,
+// the zero value is used.
+type CommonType struct {
+	ByteSize int64  // size of value of this type, in bytes
+	Name     string // name that can be used to refer to type
+}
+
+func (c *CommonType) Common() *CommonType { return c }
+
+func (c *CommonType) Size() int64 { return c.ByteSize }
+
+// Basic types
+
+// A BasicType holds fields common to all basic types.
+type BasicType struct {
+	CommonType
+	BitSize   int64
+	BitOffset int64
+}
+
+func (b *BasicType) Basic() *BasicType { return b }
+
+func (t *BasicType) String() string {
+	if t.Name != "" {
+		return t.Name
+	}
+	return "?"
+}
+
+// A CharType represents a signed character type.
+type CharType struct {
+	BasicType
+}
+
+// A UcharType represents an unsigned character type.
+type UcharType struct {
+	BasicType
+}
+
+// An IntType represents a signed integer type.
+type IntType struct {
+	BasicType
+}
+
+// A UintType represents an unsigned integer type.
+type UintType struct {
+	BasicType
+}
+
+// A FloatType represents a floating point type.
+type FloatType struct {
+	BasicType
+}
+
+// A ComplexType represents a complex floating point type.
+type ComplexType struct {
+	BasicType
+}
+
+// A BoolType represents a boolean type.
+type BoolType struct {
+	BasicType
+}
+
+// An AddrType represents a machine address type.
+type AddrType struct {
+	BasicType
+}
+
+// An UnspecifiedType represents an implicit, unknown, ambiguous or nonexistent type.
+type UnspecifiedType struct {
+	BasicType
+}
+
+// qualifiers
+
+// A QualType represents a type that has the C/C++ "const", "restrict", or "volatile" qualifier.
+type QualType struct {
+	CommonType
+	Qual string
+	Type Type
+}
+
+func (t *QualType) String() string { return t.Qual + " " + t.Type.String() }
+
+func (t *QualType) Size() int64 { return t.Type.Size() }
+
+// An ArrayType represents a fixed size array type.
+type ArrayType struct {
+	CommonType
+	Type          Type
+	StrideBitSize int64 // if > 0, number of bits to hold each element
+	Count         int64 // if == -1, an incomplete array, like char x[].
+}
+
+func (t *ArrayType) String() string {
+	return "[" + strconv.FormatInt(t.Count, 10) + "]" + t.Type.String()
+}
+
+func (t *ArrayType) Size() int64 {
+	if t.Count == -1 {
+		return 0
+	}
+	return t.Count * t.Type.Size()
+}
+
+// A VoidType represents the C void type.
+type VoidType struct {
+	CommonType
+}
+
+func (t *VoidType) String() string { return "void" }
+
+// A PtrType represents a pointer type.
+type PtrType struct {
+	CommonType
+	Type Type
+}
+
+func (t *PtrType) String() string { return "*" + t.Type.String() }
+
+// A StructType represents a struct, union, or C++ class type.
+type StructType struct {
+	CommonType
+	StructName string
+	Kind       string // "struct", "union", or "class".
+	Field      []*StructField
+	Incomplete bool // if true, struct, union, class is declared but not defined
+}
+
+// A StructField represents a field in a struct, union, or C++ class type.
+type StructField struct {
+	Name       string
+	Type       Type
+	ByteOffset int64
+	ByteSize   int64 // usually zero; use Type.Size() for normal fields
+	BitOffset  int64 // within the ByteSize bytes at ByteOffset
+	BitSize    int64 // zero if not a bit field
+}
+
+func (t *StructType) String() string {
+	if t.StructName != "" {
+		return t.Kind + " " + t.StructName
+	}
+	return t.Defn()
+}
+
+func (t *StructType) Defn() string {
+	s := t.Kind
+	if t.StructName != "" {
+		s += " " + t.StructName
+	}
+	if t.Incomplete {
+		s += " /*incomplete*/"
+		return s
+	}
+	s += " {"
+	for i, f := range t.Field {
+		if i > 0 {
+			s += "; "
+		}
+		s += f.Name + " " + f.Type.String()
+		s += "@" + strconv.FormatInt(f.ByteOffset, 10)
+		if f.BitSize > 0 {
+			s += " : " + strconv.FormatInt(f.BitSize, 10)
+			s += "@" + strconv.FormatInt(f.BitOffset, 10)
+		}
+	}
+	s += "}"
+	return s
+}
+
+// An EnumType represents an enumerated type.
+// The only indication of its native integer type is its ByteSize
+// (inside CommonType).
+type EnumType struct {
+	CommonType
+	EnumName string
+	Val      []*EnumValue
+}
+
+// An EnumValue represents a single enumeration value.
+type EnumValue struct {
+	Name string
+	Val  int64
+}
+
+func (t *EnumType) String() string {
+	s := "enum"
+	if t.EnumName != "" {
+		s += " " + t.EnumName
+	}
+	s += " {"
+	for i, v := range t.Val {
+		if i > 0 {
+			s += "; "
+		}
+		s += v.Name + "=" + strconv.FormatInt(v.Val, 10)
+	}
+	s += "}"
+	return s
+}
+
+// A FuncType represents a function type.
+type FuncType struct {
+	CommonType
+	ReturnType Type
+	ParamType  []Type
+}
+
+func (t *FuncType) String() string {
+	s := "func("
+	for i, t := range t.ParamType {
+		if i > 0 {
+			s += ", "
+		}
+		s += t.String()
+	}
+	s += ")"
+	if t.ReturnType != nil {
+		s += " " + t.ReturnType.String()
+	}
+	return s
+}
+
+// A DotDotDotType represents the variadic ... function parameter.
+type DotDotDotType struct {
+	CommonType
+}
+
+func (t *DotDotDotType) String() string { return "..." }
+
+// A TypedefType represents a named type.
+type TypedefType struct {
+	CommonType
+	Type Type
+}
+
+func (t *TypedefType) String() string { return t.Name }
+
+func (t *TypedefType) Size() int64 { return t.Type.Size() }
+
+// An UnsupportedType is a placeholder returned in situations where we
+// encounter a type that isn't supported.
+type UnsupportedType struct {
+	CommonType
+	Tag Tag
+}
+
+func (t *UnsupportedType) String() string {
+	if t.Name != "" {
+		return t.Name
+	}
+	return t.Name + "(unsupported type " + t.Tag.String() + ")"
+}
+
+// typeReader is used to read from either the info section or the
+// types section.
+type typeReader interface {
+	Seek(Offset)
+	Next() (*Entry, error)
+	clone() typeReader
+	offset() Offset
+	// AddressSize returns the size in bytes of addresses in the current
+	// compilation unit.
+	AddressSize() int
+}
+
+// Type reads the type at off in the DWARF ``info'' section.
+func (d *Data) Type(off Offset) (Type, error) {
+	return d.readType("info", d.Reader(), off, d.typeCache, nil)
+}
+
+type typeFixer struct {
+	typedefs   []*TypedefType
+	arraytypes []*Type
+}
+
+func (tf *typeFixer) recordArrayType(t *Type) {
+	if t == nil {
+		return
+	}
+	_, ok := (*t).(*ArrayType)
+	if ok {
+		tf.arraytypes = append(tf.arraytypes, t)
+	}
+}
+
+func (tf *typeFixer) apply() {
+	for _, t := range tf.typedefs {
+		t.Common().ByteSize = t.Type.Size()
+	}
+	for _, t := range tf.arraytypes {
+		zeroArray(t)
+	}
+}
+
+// readType reads a type from r at off of name. It adds types to the
+// type cache, appends new typedef types to typedefs, and computes the
+// sizes of types. Callers should pass nil for typedefs; this is used
+// for internal recursion.
+func (d *Data) readType(name string, r typeReader, off Offset, typeCache map[Offset]Type, fixups *typeFixer) (Type, error) {
+	if t, ok := typeCache[off]; ok {
+		return t, nil
+	}
+	r.Seek(off)
+	e, err := r.Next()
+	if err != nil {
+		return nil, err
+	}
+	addressSize := r.AddressSize()
+	if e == nil || e.Offset != off {
+		return nil, DecodeError{name, off, "no type at offset"}
+	}
+
+	// If this is the root of the recursion, prepare to resolve
+	// typedef sizes and perform other fixups once the recursion is
+	// done. This must be done after the type graph is constructed
+	// because it may need to resolve cycles in a different order than
+	// readType encounters them.
+	if fixups == nil {
+		var fixer typeFixer
+		defer func() {
+			fixer.apply()
+		}()
+		fixups = &fixer
+	}
+
+	// Parse type from Entry.
+	// Must always set typeCache[off] before calling
+	// d.readType recursively, to handle circular types correctly.
+	var typ Type
+
+	nextDepth := 0
+
+	// Get next child; set err if error happens.
+	next := func() *Entry {
+		if !e.Children {
+			return nil
+		}
+		// Only return direct children.
+		// Skip over composite entries that happen to be nested
+		// inside this one. Most DWARF generators wouldn't generate
+		// such a thing, but clang does.
+		// See golang.org/issue/6472.
+		for {
+			kid, err1 := r.Next()
+			if err1 != nil {
+				err = err1
+				return nil
+			}
+			if kid == nil {
+				err = DecodeError{name, r.offset(), "unexpected end of DWARF entries"}
+				return nil
+			}
+			if kid.Tag == 0 {
+				if nextDepth > 0 {
+					nextDepth--
+					continue
+				}
+				return nil
+			}
+			if kid.Children {
+				nextDepth++
+			}
+			if nextDepth > 0 {
+				continue
+			}
+			return kid
+		}
+	}
+
+	// Get Type referred to by Entry's AttrType field.
+	// Set err if error happens. Not having a type is an error.
+	typeOf := func(e *Entry) Type {
+		tval := e.Val(AttrType)
+		var t Type
+		switch toff := tval.(type) {
+		case Offset:
+			if t, err = d.readType(name, r.clone(), toff, typeCache, fixups); err != nil {
+				return nil
+			}
+		case uint64:
+			if t, err = d.sigToType(toff); err != nil {
+				return nil
+			}
+		default:
+			// It appears that no Type means "void".
+			return new(VoidType)
+		}
+		return t
+	}
+
+	switch e.Tag {
+	case TagArrayType:
+		// Multi-dimensional array.  (DWARF v2 §5.4)
+		// Attributes:
+		//	AttrType:subtype [required]
+		//	AttrStrideSize: size in bits of each element of the array
+		//	AttrByteSize: size of entire array
+		// Children:
+		//	TagSubrangeType or TagEnumerationType giving one dimension.
+		//	dimensions are in left to right order.
+		t := new(ArrayType)
+		typ = t
+		typeCache[off] = t
+		if t.Type = typeOf(e); err != nil {
+			goto Error
+		}
+		t.StrideBitSize, _ = e.Val(AttrStrideSize).(int64)
+
+		// Accumulate dimensions,
+		var dims []int64
+		for kid := next(); kid != nil; kid = next() {
+			// TODO(rsc): Can also be TagEnumerationType
+			// but haven't seen that in the wild yet.
+			switch kid.Tag {
+			case TagSubrangeType:
+				count, ok := kid.Val(AttrCount).(int64)
+				if !ok {
+					// Old binaries may have an upper bound instead.
+					count, ok = kid.Val(AttrUpperBound).(int64)
+					if ok {
+						count++ // Length is one more than upper bound.
+					} else if len(dims) == 0 {
+						count = -1 // As in x[].
+					}
+				}
+				dims = append(dims, count)
+			case TagEnumerationType:
+				err = DecodeError{name, kid.Offset, "cannot handle enumeration type as array bound"}
+				goto Error
+			}
+		}
+		if len(dims) == 0 {
+			// LLVM generates this for x[].
+			dims = []int64{-1}
+		}
+
+		t.Count = dims[0]
+		for i := len(dims) - 1; i >= 1; i-- {
+			t.Type = &ArrayType{Type: t.Type, Count: dims[i]}
+		}
+
+	case TagBaseType:
+		// Basic type.  (DWARF v2 §5.1)
+		// Attributes:
+		//	AttrName: name of base type in programming language of the compilation unit [required]
+		//	AttrEncoding: encoding value for type (encFloat etc) [required]
+		//	AttrByteSize: size of type in bytes [required]
+		//	AttrBitOffset: for sub-byte types, size in bits
+		//	AttrBitSize: for sub-byte types, bit offset of high order bit in the AttrByteSize bytes
+		name, _ := e.Val(AttrName).(string)
+		enc, ok := e.Val(AttrEncoding).(int64)
+		if !ok {
+			err = DecodeError{name, e.Offset, "missing encoding attribute for " + name}
+			goto Error
+		}
+		switch enc {
+		default:
+			err = DecodeError{name, e.Offset, "unrecognized encoding attribute value"}
+			goto Error
+
+		case encAddress:
+			typ = new(AddrType)
+		case encBoolean:
+			typ = new(BoolType)
+		case encComplexFloat:
+			typ = new(ComplexType)
+			if name == "complex" {
+				// clang writes out 'complex' instead of 'complex float' or 'complex double'.
+				// clang also writes out a byte size that we can use to distinguish.
+				// See issue 8694.
+				switch byteSize, _ := e.Val(AttrByteSize).(int64); byteSize {
+				case 8:
+					name = "complex float"
+				case 16:
+					name = "complex double"
+				}
+			}
+		case encFloat:
+			typ = new(FloatType)
+		case encSigned:
+			typ = new(IntType)
+		case encUnsigned:
+			typ = new(UintType)
+		case encSignedChar:
+			typ = new(CharType)
+		case encUnsignedChar:
+			typ = new(UcharType)
+		}
+		typeCache[off] = typ
+		t := typ.(interface {
+			Basic() *BasicType
+		}).Basic()
+		t.Name = name
+		t.BitSize, _ = e.Val(AttrBitSize).(int64)
+		t.BitOffset, _ = e.Val(AttrBitOffset).(int64)
+
+	case TagClassType, TagStructType, TagUnionType:
+		// Structure, union, or class type.  (DWARF v2 §5.5)
+		// Attributes:
+		//	AttrName: name of struct, union, or class
+		//	AttrByteSize: byte size [required]
+		//	AttrDeclaration: if true, struct/union/class is incomplete
+		// Children:
+		//	TagMember to describe one member.
+		//		AttrName: name of member [required]
+		//		AttrType: type of member [required]
+		//		AttrByteSize: size in bytes
+		//		AttrBitOffset: bit offset within bytes for bit fields
+		//		AttrBitSize: bit size for bit fields
+		//		AttrDataMemberLoc: location within struct [required for struct, class]
+		// There is much more to handle C++, all ignored for now.
+		t := new(StructType)
+		typ = t
+		typeCache[off] = t
+		switch e.Tag {
+		case TagClassType:
+			t.Kind = "class"
+		case TagStructType:
+			t.Kind = "struct"
+		case TagUnionType:
+			t.Kind = "union"
+		}
+		t.StructName, _ = e.Val(AttrName).(string)
+		t.Incomplete = e.Val(AttrDeclaration) != nil
+		t.Field = make([]*StructField, 0, 8)
+		var lastFieldType *Type
+		var lastFieldBitOffset int64
+		for kid := next(); kid != nil; kid = next() {
+			if kid.Tag != TagMember {
+				continue
+			}
+			f := new(StructField)
+			if f.Type = typeOf(kid); err != nil {
+				goto Error
+			}
+			switch loc := kid.Val(AttrDataMemberLoc).(type) {
+			case []byte:
+				// TODO: Should have original compilation
+				// unit here, not unknownFormat.
+				b := makeBuf(d, unknownFormat{}, "location", 0, loc)
+				if b.uint8() != opPlusUconst {
+					err = DecodeError{name, kid.Offset, "unexpected opcode"}
+					goto Error
+				}
+				f.ByteOffset = int64(b.uint())
+				if b.err != nil {
+					err = b.err
+					goto Error
+				}
+			case int64:
+				f.ByteOffset = loc
+			}
+
+			haveBitOffset := false
+			f.Name, _ = kid.Val(AttrName).(string)
+			f.ByteSize, _ = kid.Val(AttrByteSize).(int64)
+			f.BitOffset, haveBitOffset = kid.Val(AttrBitOffset).(int64)
+			f.BitSize, _ = kid.Val(AttrBitSize).(int64)
+			t.Field = append(t.Field, f)
+
+			bito := f.BitOffset
+			if !haveBitOffset {
+				bito = f.ByteOffset * 8
+			}
+			if bito == lastFieldBitOffset && t.Kind != "union" {
+				// Last field was zero width. Fix array length.
+				// (DWARF writes out 0-length arrays as if they were 1-length arrays.)
+				fixups.recordArrayType(lastFieldType)
+			}
+			lastFieldType = &f.Type
+			lastFieldBitOffset = bito
+		}
+		if t.Kind != "union" {
+			b, ok := e.Val(AttrByteSize).(int64)
+			if ok && b*8 == lastFieldBitOffset {
+				// Final field must be zero width. Fix array length.
+				fixups.recordArrayType(lastFieldType)
+			}
+		}
+
+	case TagConstType, TagVolatileType, TagRestrictType:
+		// Type modifier (DWARF v2 §5.2)
+		// Attributes:
+		//	AttrType: subtype
+		t := new(QualType)
+		typ = t
+		typeCache[off] = t
+		if t.Type = typeOf(e); err != nil {
+			goto Error
+		}
+		switch e.Tag {
+		case TagConstType:
+			t.Qual = "const"
+		case TagRestrictType:
+			t.Qual = "restrict"
+		case TagVolatileType:
+			t.Qual = "volatile"
+		}
+
+	case TagEnumerationType:
+		// Enumeration type (DWARF v2 §5.6)
+		// Attributes:
+		//	AttrName: enum name if any
+		//	AttrByteSize: bytes required to represent largest value
+		// Children:
+		//	TagEnumerator:
+		//		AttrName: name of constant
+		//		AttrConstValue: value of constant
+		t := new(EnumType)
+		typ = t
+		typeCache[off] = t
+		t.EnumName, _ = e.Val(AttrName).(string)
+		t.Val = make([]*EnumValue, 0, 8)
+		for kid := next(); kid != nil; kid = next() {
+			if kid.Tag == TagEnumerator {
+				f := new(EnumValue)
+				f.Name, _ = kid.Val(AttrName).(string)
+				f.Val, _ = kid.Val(AttrConstValue).(int64)
+				n := len(t.Val)
+				if n >= cap(t.Val) {
+					val := make([]*EnumValue, n, n*2)
+					copy(val, t.Val)
+					t.Val = val
+				}
+				t.Val = t.Val[0 : n+1]
+				t.Val[n] = f
+			}
+		}
+
+	case TagPointerType:
+		// Type modifier (DWARF v2 §5.2)
+		// Attributes:
+		//	AttrType: subtype [not required!  void* has no AttrType]
+		//	AttrAddrClass: address class [ignored]
+		t := new(PtrType)
+		typ = t
+		typeCache[off] = t
+		if e.Val(AttrType) == nil {
+			t.Type = &VoidType{}
+			break
+		}
+		t.Type = typeOf(e)
+
+	case TagSubroutineType:
+		// Subroutine type.  (DWARF v2 §5.7)
+		// Attributes:
+		//	AttrType: type of return value if any
+		//	AttrName: possible name of type [ignored]
+		//	AttrPrototyped: whether used ANSI C prototype [ignored]
+		// Children:
+		//	TagFormalParameter: typed parameter
+		//		AttrType: type of parameter
+		//	TagUnspecifiedParameter: final ...
+		t := new(FuncType)
+		typ = t
+		typeCache[off] = t
+		if t.ReturnType = typeOf(e); err != nil {
+			goto Error
+		}
+		t.ParamType = make([]Type, 0, 8)
+		for kid := next(); kid != nil; kid = next() {
+			var tkid Type
+			switch kid.Tag {
+			default:
+				continue
+			case TagFormalParameter:
+				if tkid = typeOf(kid); err != nil {
+					goto Error
+				}
+			case TagUnspecifiedParameters:
+				tkid = &DotDotDotType{}
+			}
+			t.ParamType = append(t.ParamType, tkid)
+		}
+
+	case TagTypedef:
+		// Typedef (DWARF v2 §5.3)
+		// Attributes:
+		//	AttrName: name [required]
+		//	AttrType: type definition [required]
+		t := new(TypedefType)
+		typ = t
+		typeCache[off] = t
+		t.Name, _ = e.Val(AttrName).(string)
+		t.Type = typeOf(e)
+
+	case TagUnspecifiedType:
+		// Unspecified type (DWARF v3 §5.2)
+		// Attributes:
+		//	AttrName: name
+		t := new(UnspecifiedType)
+		typ = t
+		typeCache[off] = t
+		t.Name, _ = e.Val(AttrName).(string)
+
+	default:
+		// This is some other type DIE that we're currently not
+		// equipped to handle. Return an abstract "unsupported type"
+		// object in such cases.
+		t := new(UnsupportedType)
+		typ = t
+		typeCache[off] = t
+		t.Tag = e.Tag
+		t.Name, _ = e.Val(AttrName).(string)
+	}
+
+	if err != nil {
+		goto Error
+	}
+
+	{
+		b, ok := e.Val(AttrByteSize).(int64)
+		if !ok {
+			b = -1
+			switch t := typ.(type) {
+			case *TypedefType:
+				// Record that we need to resolve this
+				// type's size once the type graph is
+				// constructed.
+				fixups.typedefs = append(fixups.typedefs, t)
+			case *PtrType:
+				b = int64(addressSize)
+			}
+		}
+		typ.Common().ByteSize = b
+	}
+	return typ, nil
+
+Error:
+	// If the parse fails, take the type out of the cache
+	// so that the next call with this offset doesn't hit
+	// the cache and return success.
+	delete(typeCache, off)
+	return nil, err
+}
+
+func zeroArray(t *Type) {
+	at := (*t).(*ArrayType)
+	if at.Type.Size() == 0 {
+		return
+	}
+	// Make a copy to avoid invalidating typeCache.
+	tt := *at
+	tt.Count = 0
+	*t = &tt
+}
diff --git a/src/debug/dwarf/type_test.go b/src/debug/dwarf/type_test.go
new file mode 100644
index 0000000..fda03fd
--- /dev/null
+++ b/src/debug/dwarf/type_test.go
@@ -0,0 +1,230 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package dwarf_test
+
+import (
+	. "debug/dwarf"
+	"debug/elf"
+	"debug/macho"
+	"debug/pe"
+	"fmt"
+	"strconv"
+	"testing"
+)
+
+var typedefTests = map[string]string{
+	"t_ptr_volatile_int":                    "*volatile int",
+	"t_ptr_const_char":                      "*const char",
+	"t_long":                                "long int",
+	"t_ushort":                              "short unsigned int",
+	"t_func_int_of_float_double":            "func(float, double) int",
+	"t_ptr_func_int_of_float_double":        "*func(float, double) int",
+	"t_ptr_func_int_of_float_complex":       "*func(complex float) int",
+	"t_ptr_func_int_of_double_complex":      "*func(complex double) int",
+	"t_ptr_func_int_of_long_double_complex": "*func(complex long double) int",
+	"t_func_ptr_int_of_char_schar_uchar":    "func(char, signed char, unsigned char) *int",
+	"t_func_void_of_char":                   "func(char) void",
+	"t_func_void_of_void":                   "func() void",
+	"t_func_void_of_ptr_char_dots":          "func(*char, ...) void",
+	"t_my_struct":                           "struct my_struct {vi volatile int@0; x char@4 : 1@7; y int@4 : 4@27; z [0]int@8; array [40]long long int@8; zz [0]int@328}",
+	"t_my_struct1":                          "struct my_struct1 {zz [1]int@0}",
+	"t_my_union":                            "union my_union {vi volatile int@0; x char@0 : 1@7; y int@0 : 4@28; array [40]long long int@0}",
+	"t_my_enum":                             "enum my_enum {e1=1; e2=2; e3=-5; e4=1000000000000000}",
+	"t_my_list":                             "struct list {val short int@0; next *t_my_list@8}",
+	"t_my_tree":                             "struct tree {left *struct tree@0; right *struct tree@8; val long long unsigned int@16}",
+}
+
+// As Apple converts gcc to a clang-based front end
+// they keep breaking the DWARF output. This map lists the
+// conversion from real answer to Apple answer.
+var machoBug = map[string]string{
+	"func(*char, ...) void":                                 "func(*char) void",
+	"enum my_enum {e1=1; e2=2; e3=-5; e4=1000000000000000}": "enum my_enum {e1=1; e2=2; e3=-5; e4=-1530494976}",
+}
+
+func elfData(t *testing.T, name string) *Data {
+	f, err := elf.Open(name)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	d, err := f.DWARF()
+	if err != nil {
+		t.Fatal(err)
+	}
+	return d
+}
+
+func machoData(t *testing.T, name string) *Data {
+	f, err := macho.Open(name)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	d, err := f.DWARF()
+	if err != nil {
+		t.Fatal(err)
+	}
+	return d
+}
+
+func peData(t *testing.T, name string) *Data {
+	f, err := pe.Open(name)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	d, err := f.DWARF()
+	if err != nil {
+		t.Fatal(err)
+	}
+	return d
+}
+
+func TestTypedefsELF(t *testing.T) { testTypedefs(t, elfData(t, "testdata/typedef.elf"), "elf") }
+
+func TestTypedefsMachO(t *testing.T) {
+	testTypedefs(t, machoData(t, "testdata/typedef.macho"), "macho")
+}
+
+func TestTypedefsELFDwarf4(t *testing.T) { testTypedefs(t, elfData(t, "testdata/typedef.elf4"), "elf") }
+
+func testTypedefs(t *testing.T, d *Data, kind string) {
+	r := d.Reader()
+	seen := make(map[string]bool)
+	for {
+		e, err := r.Next()
+		if err != nil {
+			t.Fatal("r.Next:", err)
+		}
+		if e == nil {
+			break
+		}
+		if e.Tag == TagTypedef {
+			typ, err := d.Type(e.Offset)
+			if err != nil {
+				t.Fatal("d.Type:", err)
+			}
+			t1 := typ.(*TypedefType)
+			var typstr string
+			if ts, ok := t1.Type.(*StructType); ok {
+				typstr = ts.Defn()
+			} else {
+				typstr = t1.Type.String()
+			}
+
+			if want, ok := typedefTests[t1.Name]; ok {
+				if seen[t1.Name] {
+					t.Errorf("multiple definitions for %s", t1.Name)
+				}
+				seen[t1.Name] = true
+				if typstr != want && (kind != "macho" || typstr != machoBug[want]) {
+					t.Errorf("%s:\n\thave %s\n\twant %s", t1.Name, typstr, want)
+				}
+			}
+		}
+		if e.Tag != TagCompileUnit {
+			r.SkipChildren()
+		}
+	}
+
+	for k := range typedefTests {
+		if !seen[k] {
+			t.Errorf("missing %s", k)
+		}
+	}
+}
+
+func TestTypedefCycle(t *testing.T) {
+	// See issue #13039: reading a typedef cycle starting from a
+	// different place than the size needed to be computed from
+	// used to crash.
+	//
+	// cycle.elf built with GCC 4.8.4:
+	//    gcc -g -c -o cycle.elf cycle.c
+	d := elfData(t, "testdata/cycle.elf")
+	r := d.Reader()
+	offsets := []Offset{}
+	for {
+		e, err := r.Next()
+		if err != nil {
+			t.Fatal("r.Next:", err)
+		}
+		if e == nil {
+			break
+		}
+		switch e.Tag {
+		case TagBaseType, TagTypedef, TagPointerType, TagStructType:
+			offsets = append(offsets, e.Offset)
+		}
+	}
+
+	// Parse each type with a fresh type cache.
+	for _, offset := range offsets {
+		d := elfData(t, "testdata/cycle.elf")
+		_, err := d.Type(offset)
+		if err != nil {
+			t.Fatalf("d.Type(0x%x): %s", offset, err)
+		}
+	}
+}
+
+var unsupportedTypeTests = []string{
+	// varname:typename:string:size
+	"culprit::(unsupported type ReferenceType):8",
+	"pdm::(unsupported type PtrToMemberType):-1",
+}
+
+func TestUnsupportedTypes(t *testing.T) {
+	// Issue 29601:
+	// When reading DWARF from C++ load modules, we can encounter
+	// oddball type DIEs. These will be returned as "UnsupportedType"
+	// objects; check to make sure this works properly.
+	d := elfData(t, "testdata/cppunsuptypes.elf")
+	r := d.Reader()
+	seen := make(map[string]bool)
+	for {
+		e, err := r.Next()
+		if err != nil {
+			t.Fatal("r.Next:", err)
+		}
+		if e == nil {
+			break
+		}
+		if e.Tag == TagVariable {
+			vname, _ := e.Val(AttrName).(string)
+			tAttr := e.Val(AttrType)
+			typOff, ok := tAttr.(Offset)
+			if !ok {
+				t.Errorf("variable at offset %v has no type", e.Offset)
+				continue
+			}
+			typ, err := d.Type(typOff)
+			if err != nil {
+				t.Errorf("err in type decode: %v\n", err)
+				continue
+			}
+			unsup, isok := typ.(*UnsupportedType)
+			if !isok {
+				continue
+			}
+			tag := vname + ":" + unsup.Name + ":" + unsup.String() +
+				":" + strconv.FormatInt(unsup.Size(), 10)
+			seen[tag] = true
+		}
+	}
+	dumpseen := false
+	for _, v := range unsupportedTypeTests {
+		if !seen[v] {
+			t.Errorf("missing %s", v)
+			dumpseen = true
+		}
+	}
+	if dumpseen {
+		for k := range seen {
+			fmt.Printf("seen: %s\n", k)
+		}
+	}
+}
diff --git a/src/debug/dwarf/typeunit.go b/src/debug/dwarf/typeunit.go
new file mode 100644
index 0000000..27aa078
--- /dev/null
+++ b/src/debug/dwarf/typeunit.go
@@ -0,0 +1,160 @@
+// Copyright 2012 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package dwarf
+
+import (
+	"fmt"
+	"strconv"
+)
+
+// Parse the type units stored in a DWARF4 .debug_types section. Each
+// type unit defines a single primary type and an 8-byte signature.
+// Other sections may then use formRefSig8 to refer to the type.
+
+// The typeUnit format is a single type with a signature. It holds
+// the same data as a compilation unit.
+type typeUnit struct {
+	unit
+	toff  Offset // Offset to signature type within data.
+	name  string // Name of .debug_type section.
+	cache Type   // Cache the type, nil to start.
+}
+
+// Parse a .debug_types section.
+func (d *Data) parseTypes(name string, types []byte) error {
+	b := makeBuf(d, unknownFormat{}, name, 0, types)
+	for len(b.data) > 0 {
+		base := b.off
+		n, dwarf64 := b.unitLength()
+		if n != Offset(uint32(n)) {
+			b.error("type unit length overflow")
+			return b.err
+		}
+		hdroff := b.off
+		vers := int(b.uint16())
+		if vers != 4 {
+			b.error("unsupported DWARF version " + strconv.Itoa(vers))
+			return b.err
+		}
+		var ao uint64
+		if !dwarf64 {
+			ao = uint64(b.uint32())
+		} else {
+			ao = b.uint64()
+		}
+		atable, err := d.parseAbbrev(ao, vers)
+		if err != nil {
+			return err
+		}
+		asize := b.uint8()
+		sig := b.uint64()
+
+		var toff uint32
+		if !dwarf64 {
+			toff = b.uint32()
+		} else {
+			to64 := b.uint64()
+			if to64 != uint64(uint32(to64)) {
+				b.error("type unit type offset overflow")
+				return b.err
+			}
+			toff = uint32(to64)
+		}
+
+		boff := b.off
+		d.typeSigs[sig] = &typeUnit{
+			unit: unit{
+				base:   base,
+				off:    boff,
+				data:   b.bytes(int(n - (b.off - hdroff))),
+				atable: atable,
+				asize:  int(asize),
+				vers:   vers,
+				is64:   dwarf64,
+			},
+			toff: Offset(toff),
+			name: name,
+		}
+		if b.err != nil {
+			return b.err
+		}
+	}
+	return nil
+}
+
+// Return the type for a type signature.
+func (d *Data) sigToType(sig uint64) (Type, error) {
+	tu := d.typeSigs[sig]
+	if tu == nil {
+		return nil, fmt.Errorf("no type unit with signature %v", sig)
+	}
+	if tu.cache != nil {
+		return tu.cache, nil
+	}
+
+	b := makeBuf(d, tu, tu.name, tu.off, tu.data)
+	r := &typeUnitReader{d: d, tu: tu, b: b}
+	t, err := d.readType(tu.name, r, tu.toff, make(map[Offset]Type), nil)
+	if err != nil {
+		return nil, err
+	}
+
+	tu.cache = t
+	return t, nil
+}
+
+// typeUnitReader is a typeReader for a tagTypeUnit.
+type typeUnitReader struct {
+	d   *Data
+	tu  *typeUnit
+	b   buf
+	err error
+}
+
+// Seek to a new position in the type unit.
+func (tur *typeUnitReader) Seek(off Offset) {
+	tur.err = nil
+	doff := off - tur.tu.off
+	if doff < 0 || doff >= Offset(len(tur.tu.data)) {
+		tur.err = fmt.Errorf("%s: offset %d out of range; max %d", tur.tu.name, doff, len(tur.tu.data))
+		return
+	}
+	tur.b = makeBuf(tur.d, tur.tu, tur.tu.name, off, tur.tu.data[doff:])
+}
+
+// AddressSize returns the size in bytes of addresses in the current type unit.
+func (tur *typeUnitReader) AddressSize() int {
+	return tur.tu.unit.asize
+}
+
+// Next reads the next Entry from the type unit.
+func (tur *typeUnitReader) Next() (*Entry, error) {
+	if tur.err != nil {
+		return nil, tur.err
+	}
+	if len(tur.tu.data) == 0 {
+		return nil, nil
+	}
+	e := tur.b.entry(nil, tur.tu.atable, tur.tu.base, tur.tu.vers)
+	if tur.b.err != nil {
+		tur.err = tur.b.err
+		return nil, tur.err
+	}
+	return e, nil
+}
+
+// clone returns a new reader for the type unit.
+func (tur *typeUnitReader) clone() typeReader {
+	return &typeUnitReader{
+		d:  tur.d,
+		tu: tur.tu,
+		b:  makeBuf(tur.d, tur.tu, tur.tu.name, tur.tu.off, tur.tu.data),
+	}
+}
+
+// offset returns the current offset.
+func (tur *typeUnitReader) offset() Offset {
+	return tur.b.off
+}
diff --git a/src/debug/dwarf/unit.go b/src/debug/dwarf/unit.go
new file mode 100644
index 0000000..9b3d6e9
--- /dev/null
+++ b/src/debug/dwarf/unit.go
@@ -0,0 +1,134 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package dwarf
+
+import (
+	"sort"
+	"strconv"
+)
+
+// DWARF debug info is split into a sequence of compilation units.
+// Each unit has its own abbreviation table and address size.
+
+type unit struct {
+	base   Offset // byte offset of header within the aggregate info
+	off    Offset // byte offset of data within the aggregate info
+	data   []byte
+	atable abbrevTable
+	asize  int
+	vers   int
+	utype  uint8 // DWARF 5 unit type
+	is64   bool  // True for 64-bit DWARF format
+}
+
+// Implement the dataFormat interface.
+
+func (u *unit) version() int {
+	return u.vers
+}
+
+func (u *unit) dwarf64() (bool, bool) {
+	return u.is64, true
+}
+
+func (u *unit) addrsize() int {
+	return u.asize
+}
+
+func (d *Data) parseUnits() ([]unit, error) {
+	// Count units.
+	nunit := 0
+	b := makeBuf(d, unknownFormat{}, "info", 0, d.info)
+	for len(b.data) > 0 {
+		len, _ := b.unitLength()
+		if len != Offset(uint32(len)) {
+			b.error("unit length overflow")
+			break
+		}
+		b.skip(int(len))
+		if len > 0 {
+			nunit++
+		}
+	}
+	if b.err != nil {
+		return nil, b.err
+	}
+
+	// Again, this time writing them down.
+	b = makeBuf(d, unknownFormat{}, "info", 0, d.info)
+	units := make([]unit, nunit)
+	for i := range units {
+		u := &units[i]
+		u.base = b.off
+		var n Offset
+		for n == 0 {
+			n, u.is64 = b.unitLength()
+		}
+		dataOff := b.off
+		vers := b.uint16()
+		if vers < 2 || vers > 5 {
+			b.error("unsupported DWARF version " + strconv.Itoa(int(vers)))
+			break
+		}
+		u.vers = int(vers)
+		if vers >= 5 {
+			u.utype = b.uint8()
+			u.asize = int(b.uint8())
+		}
+		var abbrevOff uint64
+		if u.is64 {
+			abbrevOff = b.uint64()
+		} else {
+			abbrevOff = uint64(b.uint32())
+		}
+		atable, err := d.parseAbbrev(abbrevOff, u.vers)
+		if err != nil {
+			if b.err == nil {
+				b.err = err
+			}
+			break
+		}
+		u.atable = atable
+		if vers < 5 {
+			u.asize = int(b.uint8())
+		}
+
+		switch u.utype {
+		case utSkeleton, utSplitCompile:
+			b.uint64() // unit ID
+		case utType, utSplitType:
+			b.uint64()  // type signature
+			if u.is64 { // type offset
+				b.uint64()
+			} else {
+				b.uint32()
+			}
+		}
+
+		u.off = b.off
+		u.data = b.bytes(int(n - (b.off - dataOff)))
+	}
+	if b.err != nil {
+		return nil, b.err
+	}
+	return units, nil
+}
+
+// offsetToUnit returns the index of the unit containing offset off.
+// It returns -1 if no unit contains this offset.
+func (d *Data) offsetToUnit(off Offset) int {
+	// Find the unit after off
+	next := sort.Search(len(d.unit), func(i int) bool {
+		return d.unit[i].off > off
+	})
+	if next == 0 {
+		return -1
+	}
+	u := &d.unit[next-1]
+	if u.off <= off && off < u.off+Offset(len(u.data)) {
+		return next - 1
+	}
+	return -1
+}
diff --git a/src/debug/elf/elf.go b/src/debug/elf/elf.go
new file mode 100644
index 0000000..9f8399d
--- /dev/null
+++ b/src/debug/elf/elf.go
@@ -0,0 +1,3176 @@
+/*
+ * ELF constants and data structures
+ *
+ * Derived from:
+ * $FreeBSD: src/sys/sys/elf32.h,v 1.8.14.1 2005/12/30 22:13:58 marcel Exp $
+ * $FreeBSD: src/sys/sys/elf64.h,v 1.10.14.1 2005/12/30 22:13:58 marcel Exp $
+ * $FreeBSD: src/sys/sys/elf_common.h,v 1.15.8.1 2005/12/30 22:13:58 marcel Exp $
+ * $FreeBSD: src/sys/alpha/include/elf.h,v 1.14 2003/09/25 01:10:22 peter Exp $
+ * $FreeBSD: src/sys/amd64/include/elf.h,v 1.18 2004/08/03 08:21:48 dfr Exp $
+ * $FreeBSD: src/sys/arm/include/elf.h,v 1.5.2.1 2006/06/30 21:42:52 cognet Exp $
+ * $FreeBSD: src/sys/i386/include/elf.h,v 1.16 2004/08/02 19:12:17 dfr Exp $
+ * $FreeBSD: src/sys/powerpc/include/elf.h,v 1.7 2004/11/02 09:47:01 ssouhlal Exp $
+ * $FreeBSD: src/sys/sparc64/include/elf.h,v 1.12 2003/09/25 01:10:26 peter Exp $
+ * "System V ABI" (http://www.sco.com/developers/gabi/latest/ch4.eheader.html)
+ * "ELF for the ARM® 64-bit Architecture (AArch64)" (ARM IHI 0056B)
+ * "RISC-V ELF psABI specification" (https://github.com/riscv/riscv-elf-psabi-doc/blob/master/riscv-elf.md)
+ * llvm/BinaryFormat/ELF.h - ELF constants and structures
+ *
+ * Copyright (c) 1996-1998 John D. Polstra.  All rights reserved.
+ * Copyright (c) 2001 David E. O'Brien
+ * Portions Copyright 2009 The Go Authors. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+package elf
+
+import "strconv"
+
+/*
+ * Constants
+ */
+
+// Indexes into the Header.Ident array.
+const (
+	EI_CLASS      = 4  /* Class of machine. */
+	EI_DATA       = 5  /* Data format. */
+	EI_VERSION    = 6  /* ELF format version. */
+	EI_OSABI      = 7  /* Operating system / ABI identification */
+	EI_ABIVERSION = 8  /* ABI version */
+	EI_PAD        = 9  /* Start of padding (per SVR4 ABI). */
+	EI_NIDENT     = 16 /* Size of e_ident array. */
+)
+
+// Initial magic number for ELF files.
+const ELFMAG = "\177ELF"
+
+// Version is found in Header.Ident[EI_VERSION] and Header.Version.
+type Version byte
+
+const (
+	EV_NONE    Version = 0
+	EV_CURRENT Version = 1
+)
+
+var versionStrings = []intName{
+	{0, "EV_NONE"},
+	{1, "EV_CURRENT"},
+}
+
+func (i Version) String() string   { return stringName(uint32(i), versionStrings, false) }
+func (i Version) GoString() string { return stringName(uint32(i), versionStrings, true) }
+
+// Class is found in Header.Ident[EI_CLASS] and Header.Class.
+type Class byte
+
+const (
+	ELFCLASSNONE Class = 0 /* Unknown class. */
+	ELFCLASS32   Class = 1 /* 32-bit architecture. */
+	ELFCLASS64   Class = 2 /* 64-bit architecture. */
+)
+
+var classStrings = []intName{
+	{0, "ELFCLASSNONE"},
+	{1, "ELFCLASS32"},
+	{2, "ELFCLASS64"},
+}
+
+func (i Class) String() string   { return stringName(uint32(i), classStrings, false) }
+func (i Class) GoString() string { return stringName(uint32(i), classStrings, true) }
+
+// Data is found in Header.Ident[EI_DATA] and Header.Data.
+type Data byte
+
+const (
+	ELFDATANONE Data = 0 /* Unknown data format. */
+	ELFDATA2LSB Data = 1 /* 2's complement little-endian. */
+	ELFDATA2MSB Data = 2 /* 2's complement big-endian. */
+)
+
+var dataStrings = []intName{
+	{0, "ELFDATANONE"},
+	{1, "ELFDATA2LSB"},
+	{2, "ELFDATA2MSB"},
+}
+
+func (i Data) String() string   { return stringName(uint32(i), dataStrings, false) }
+func (i Data) GoString() string { return stringName(uint32(i), dataStrings, true) }
+
+// OSABI is found in Header.Ident[EI_OSABI] and Header.OSABI.
+type OSABI byte
+
+const (
+	ELFOSABI_NONE       OSABI = 0   /* UNIX System V ABI */
+	ELFOSABI_HPUX       OSABI = 1   /* HP-UX operating system */
+	ELFOSABI_NETBSD     OSABI = 2   /* NetBSD */
+	ELFOSABI_LINUX      OSABI = 3   /* Linux */
+	ELFOSABI_HURD       OSABI = 4   /* Hurd */
+	ELFOSABI_86OPEN     OSABI = 5   /* 86Open common IA32 ABI */
+	ELFOSABI_SOLARIS    OSABI = 6   /* Solaris */
+	ELFOSABI_AIX        OSABI = 7   /* AIX */
+	ELFOSABI_IRIX       OSABI = 8   /* IRIX */
+	ELFOSABI_FREEBSD    OSABI = 9   /* FreeBSD */
+	ELFOSABI_TRU64      OSABI = 10  /* TRU64 UNIX */
+	ELFOSABI_MODESTO    OSABI = 11  /* Novell Modesto */
+	ELFOSABI_OPENBSD    OSABI = 12  /* OpenBSD */
+	ELFOSABI_OPENVMS    OSABI = 13  /* Open VMS */
+	ELFOSABI_NSK        OSABI = 14  /* HP Non-Stop Kernel */
+	ELFOSABI_AROS       OSABI = 15  /* Amiga Research OS */
+	ELFOSABI_FENIXOS    OSABI = 16  /* The FenixOS highly scalable multi-core OS */
+	ELFOSABI_CLOUDABI   OSABI = 17  /* Nuxi CloudABI */
+	ELFOSABI_ARM        OSABI = 97  /* ARM */
+	ELFOSABI_STANDALONE OSABI = 255 /* Standalone (embedded) application */
+)
+
+var osabiStrings = []intName{
+	{0, "ELFOSABI_NONE"},
+	{1, "ELFOSABI_HPUX"},
+	{2, "ELFOSABI_NETBSD"},
+	{3, "ELFOSABI_LINUX"},
+	{4, "ELFOSABI_HURD"},
+	{5, "ELFOSABI_86OPEN"},
+	{6, "ELFOSABI_SOLARIS"},
+	{7, "ELFOSABI_AIX"},
+	{8, "ELFOSABI_IRIX"},
+	{9, "ELFOSABI_FREEBSD"},
+	{10, "ELFOSABI_TRU64"},
+	{11, "ELFOSABI_MODESTO"},
+	{12, "ELFOSABI_OPENBSD"},
+	{13, "ELFOSABI_OPENVMS"},
+	{14, "ELFOSABI_NSK"},
+	{15, "ELFOSABI_AROS"},
+	{16, "ELFOSABI_FENIXOS"},
+	{17, "ELFOSABI_CLOUDABI"},
+	{97, "ELFOSABI_ARM"},
+	{255, "ELFOSABI_STANDALONE"},
+}
+
+func (i OSABI) String() string   { return stringName(uint32(i), osabiStrings, false) }
+func (i OSABI) GoString() string { return stringName(uint32(i), osabiStrings, true) }
+
+// Type is found in Header.Type.
+type Type uint16
+
+const (
+	ET_NONE   Type = 0      /* Unknown type. */
+	ET_REL    Type = 1      /* Relocatable. */
+	ET_EXEC   Type = 2      /* Executable. */
+	ET_DYN    Type = 3      /* Shared object. */
+	ET_CORE   Type = 4      /* Core file. */
+	ET_LOOS   Type = 0xfe00 /* First operating system specific. */
+	ET_HIOS   Type = 0xfeff /* Last operating system-specific. */
+	ET_LOPROC Type = 0xff00 /* First processor-specific. */
+	ET_HIPROC Type = 0xffff /* Last processor-specific. */
+)
+
+var typeStrings = []intName{
+	{0, "ET_NONE"},
+	{1, "ET_REL"},
+	{2, "ET_EXEC"},
+	{3, "ET_DYN"},
+	{4, "ET_CORE"},
+	{0xfe00, "ET_LOOS"},
+	{0xfeff, "ET_HIOS"},
+	{0xff00, "ET_LOPROC"},
+	{0xffff, "ET_HIPROC"},
+}
+
+func (i Type) String() string   { return stringName(uint32(i), typeStrings, false) }
+func (i Type) GoString() string { return stringName(uint32(i), typeStrings, true) }
+
+// Machine is found in Header.Machine.
+type Machine uint16
+
+const (
+	EM_NONE          Machine = 0   /* Unknown machine. */
+	EM_M32           Machine = 1   /* AT&T WE32100. */
+	EM_SPARC         Machine = 2   /* Sun SPARC. */
+	EM_386           Machine = 3   /* Intel i386. */
+	EM_68K           Machine = 4   /* Motorola 68000. */
+	EM_88K           Machine = 5   /* Motorola 88000. */
+	EM_860           Machine = 7   /* Intel i860. */
+	EM_MIPS          Machine = 8   /* MIPS R3000 Big-Endian only. */
+	EM_S370          Machine = 9   /* IBM System/370. */
+	EM_MIPS_RS3_LE   Machine = 10  /* MIPS R3000 Little-Endian. */
+	EM_PARISC        Machine = 15  /* HP PA-RISC. */
+	EM_VPP500        Machine = 17  /* Fujitsu VPP500. */
+	EM_SPARC32PLUS   Machine = 18  /* SPARC v8plus. */
+	EM_960           Machine = 19  /* Intel 80960. */
+	EM_PPC           Machine = 20  /* PowerPC 32-bit. */
+	EM_PPC64         Machine = 21  /* PowerPC 64-bit. */
+	EM_S390          Machine = 22  /* IBM System/390. */
+	EM_V800          Machine = 36  /* NEC V800. */
+	EM_FR20          Machine = 37  /* Fujitsu FR20. */
+	EM_RH32          Machine = 38  /* TRW RH-32. */
+	EM_RCE           Machine = 39  /* Motorola RCE. */
+	EM_ARM           Machine = 40  /* ARM. */
+	EM_SH            Machine = 42  /* Hitachi SH. */
+	EM_SPARCV9       Machine = 43  /* SPARC v9 64-bit. */
+	EM_TRICORE       Machine = 44  /* Siemens TriCore embedded processor. */
+	EM_ARC           Machine = 45  /* Argonaut RISC Core. */
+	EM_H8_300        Machine = 46  /* Hitachi H8/300. */
+	EM_H8_300H       Machine = 47  /* Hitachi H8/300H. */
+	EM_H8S           Machine = 48  /* Hitachi H8S. */
+	EM_H8_500        Machine = 49  /* Hitachi H8/500. */
+	EM_IA_64         Machine = 50  /* Intel IA-64 Processor. */
+	EM_MIPS_X        Machine = 51  /* Stanford MIPS-X. */
+	EM_COLDFIRE      Machine = 52  /* Motorola ColdFire. */
+	EM_68HC12        Machine = 53  /* Motorola M68HC12. */
+	EM_MMA           Machine = 54  /* Fujitsu MMA. */
+	EM_PCP           Machine = 55  /* Siemens PCP. */
+	EM_NCPU          Machine = 56  /* Sony nCPU. */
+	EM_NDR1          Machine = 57  /* Denso NDR1 microprocessor. */
+	EM_STARCORE      Machine = 58  /* Motorola Star*Core processor. */
+	EM_ME16          Machine = 59  /* Toyota ME16 processor. */
+	EM_ST100         Machine = 60  /* STMicroelectronics ST100 processor. */
+	EM_TINYJ         Machine = 61  /* Advanced Logic Corp. TinyJ processor. */
+	EM_X86_64        Machine = 62  /* Advanced Micro Devices x86-64 */
+	EM_PDSP          Machine = 63  /* Sony DSP Processor */
+	EM_PDP10         Machine = 64  /* Digital Equipment Corp. PDP-10 */
+	EM_PDP11         Machine = 65  /* Digital Equipment Corp. PDP-11 */
+	EM_FX66          Machine = 66  /* Siemens FX66 microcontroller */
+	EM_ST9PLUS       Machine = 67  /* STMicroelectronics ST9+ 8/16 bit microcontroller */
+	EM_ST7           Machine = 68  /* STMicroelectronics ST7 8-bit microcontroller */
+	EM_68HC16        Machine = 69  /* Motorola MC68HC16 Microcontroller */
+	EM_68HC11        Machine = 70  /* Motorola MC68HC11 Microcontroller */
+	EM_68HC08        Machine = 71  /* Motorola MC68HC08 Microcontroller */
+	EM_68HC05        Machine = 72  /* Motorola MC68HC05 Microcontroller */
+	EM_SVX           Machine = 73  /* Silicon Graphics SVx */
+	EM_ST19          Machine = 74  /* STMicroelectronics ST19 8-bit microcontroller */
+	EM_VAX           Machine = 75  /* Digital VAX */
+	EM_CRIS          Machine = 76  /* Axis Communications 32-bit embedded processor */
+	EM_JAVELIN       Machine = 77  /* Infineon Technologies 32-bit embedded processor */
+	EM_FIREPATH      Machine = 78  /* Element 14 64-bit DSP Processor */
+	EM_ZSP           Machine = 79  /* LSI Logic 16-bit DSP Processor */
+	EM_MMIX          Machine = 80  /* Donald Knuth's educational 64-bit processor */
+	EM_HUANY         Machine = 81  /* Harvard University machine-independent object files */
+	EM_PRISM         Machine = 82  /* SiTera Prism */
+	EM_AVR           Machine = 83  /* Atmel AVR 8-bit microcontroller */
+	EM_FR30          Machine = 84  /* Fujitsu FR30 */
+	EM_D10V          Machine = 85  /* Mitsubishi D10V */
+	EM_D30V          Machine = 86  /* Mitsubishi D30V */
+	EM_V850          Machine = 87  /* NEC v850 */
+	EM_M32R          Machine = 88  /* Mitsubishi M32R */
+	EM_MN10300       Machine = 89  /* Matsushita MN10300 */
+	EM_MN10200       Machine = 90  /* Matsushita MN10200 */
+	EM_PJ            Machine = 91  /* picoJava */
+	EM_OPENRISC      Machine = 92  /* OpenRISC 32-bit embedded processor */
+	EM_ARC_COMPACT   Machine = 93  /* ARC International ARCompact processor (old spelling/synonym: EM_ARC_A5) */
+	EM_XTENSA        Machine = 94  /* Tensilica Xtensa Architecture */
+	EM_VIDEOCORE     Machine = 95  /* Alphamosaic VideoCore processor */
+	EM_TMM_GPP       Machine = 96  /* Thompson Multimedia General Purpose Processor */
+	EM_NS32K         Machine = 97  /* National Semiconductor 32000 series */
+	EM_TPC           Machine = 98  /* Tenor Network TPC processor */
+	EM_SNP1K         Machine = 99  /* Trebia SNP 1000 processor */
+	EM_ST200         Machine = 100 /* STMicroelectronics (www.st.com) ST200 microcontroller */
+	EM_IP2K          Machine = 101 /* Ubicom IP2xxx microcontroller family */
+	EM_MAX           Machine = 102 /* MAX Processor */
+	EM_CR            Machine = 103 /* National Semiconductor CompactRISC microprocessor */
+	EM_F2MC16        Machine = 104 /* Fujitsu F2MC16 */
+	EM_MSP430        Machine = 105 /* Texas Instruments embedded microcontroller msp430 */
+	EM_BLACKFIN      Machine = 106 /* Analog Devices Blackfin (DSP) processor */
+	EM_SE_C33        Machine = 107 /* S1C33 Family of Seiko Epson processors */
+	EM_SEP           Machine = 108 /* Sharp embedded microprocessor */
+	EM_ARCA          Machine = 109 /* Arca RISC Microprocessor */
+	EM_UNICORE       Machine = 110 /* Microprocessor series from PKU-Unity Ltd. and MPRC of Peking University */
+	EM_EXCESS        Machine = 111 /* eXcess: 16/32/64-bit configurable embedded CPU */
+	EM_DXP           Machine = 112 /* Icera Semiconductor Inc. Deep Execution Processor */
+	EM_ALTERA_NIOS2  Machine = 113 /* Altera Nios II soft-core processor */
+	EM_CRX           Machine = 114 /* National Semiconductor CompactRISC CRX microprocessor */
+	EM_XGATE         Machine = 115 /* Motorola XGATE embedded processor */
+	EM_C166          Machine = 116 /* Infineon C16x/XC16x processor */
+	EM_M16C          Machine = 117 /* Renesas M16C series microprocessors */
+	EM_DSPIC30F      Machine = 118 /* Microchip Technology dsPIC30F Digital Signal Controller */
+	EM_CE            Machine = 119 /* Freescale Communication Engine RISC core */
+	EM_M32C          Machine = 120 /* Renesas M32C series microprocessors */
+	EM_TSK3000       Machine = 131 /* Altium TSK3000 core */
+	EM_RS08          Machine = 132 /* Freescale RS08 embedded processor */
+	EM_SHARC         Machine = 133 /* Analog Devices SHARC family of 32-bit DSP processors */
+	EM_ECOG2         Machine = 134 /* Cyan Technology eCOG2 microprocessor */
+	EM_SCORE7        Machine = 135 /* Sunplus S+core7 RISC processor */
+	EM_DSP24         Machine = 136 /* New Japan Radio (NJR) 24-bit DSP Processor */
+	EM_VIDEOCORE3    Machine = 137 /* Broadcom VideoCore III processor */
+	EM_LATTICEMICO32 Machine = 138 /* RISC processor for Lattice FPGA architecture */
+	EM_SE_C17        Machine = 139 /* Seiko Epson C17 family */
+	EM_TI_C6000      Machine = 140 /* The Texas Instruments TMS320C6000 DSP family */
+	EM_TI_C2000      Machine = 141 /* The Texas Instruments TMS320C2000 DSP family */
+	EM_TI_C5500      Machine = 142 /* The Texas Instruments TMS320C55x DSP family */
+	EM_TI_ARP32      Machine = 143 /* Texas Instruments Application Specific RISC Processor, 32bit fetch */
+	EM_TI_PRU        Machine = 144 /* Texas Instruments Programmable Realtime Unit */
+	EM_MMDSP_PLUS    Machine = 160 /* STMicroelectronics 64bit VLIW Data Signal Processor */
+	EM_CYPRESS_M8C   Machine = 161 /* Cypress M8C microprocessor */
+	EM_R32C          Machine = 162 /* Renesas R32C series microprocessors */
+	EM_TRIMEDIA      Machine = 163 /* NXP Semiconductors TriMedia architecture family */
+	EM_QDSP6         Machine = 164 /* QUALCOMM DSP6 Processor */
+	EM_8051          Machine = 165 /* Intel 8051 and variants */
+	EM_STXP7X        Machine = 166 /* STMicroelectronics STxP7x family of configurable and extensible RISC processors */
+	EM_NDS32         Machine = 167 /* Andes Technology compact code size embedded RISC processor family */
+	EM_ECOG1         Machine = 168 /* Cyan Technology eCOG1X family */
+	EM_ECOG1X        Machine = 168 /* Cyan Technology eCOG1X family */
+	EM_MAXQ30        Machine = 169 /* Dallas Semiconductor MAXQ30 Core Micro-controllers */
+	EM_XIMO16        Machine = 170 /* New Japan Radio (NJR) 16-bit DSP Processor */
+	EM_MANIK         Machine = 171 /* M2000 Reconfigurable RISC Microprocessor */
+	EM_CRAYNV2       Machine = 172 /* Cray Inc. NV2 vector architecture */
+	EM_RX            Machine = 173 /* Renesas RX family */
+	EM_METAG         Machine = 174 /* Imagination Technologies META processor architecture */
+	EM_MCST_ELBRUS   Machine = 175 /* MCST Elbrus general purpose hardware architecture */
+	EM_ECOG16        Machine = 176 /* Cyan Technology eCOG16 family */
+	EM_CR16          Machine = 177 /* National Semiconductor CompactRISC CR16 16-bit microprocessor */
+	EM_ETPU          Machine = 178 /* Freescale Extended Time Processing Unit */
+	EM_SLE9X         Machine = 179 /* Infineon Technologies SLE9X core */
+	EM_L10M          Machine = 180 /* Intel L10M */
+	EM_K10M          Machine = 181 /* Intel K10M */
+	EM_AARCH64       Machine = 183 /* ARM 64-bit Architecture (AArch64) */
+	EM_AVR32         Machine = 185 /* Atmel Corporation 32-bit microprocessor family */
+	EM_STM8          Machine = 186 /* STMicroeletronics STM8 8-bit microcontroller */
+	EM_TILE64        Machine = 187 /* Tilera TILE64 multicore architecture family */
+	EM_TILEPRO       Machine = 188 /* Tilera TILEPro multicore architecture family */
+	EM_MICROBLAZE    Machine = 189 /* Xilinx MicroBlaze 32-bit RISC soft processor core */
+	EM_CUDA          Machine = 190 /* NVIDIA CUDA architecture */
+	EM_TILEGX        Machine = 191 /* Tilera TILE-Gx multicore architecture family */
+	EM_CLOUDSHIELD   Machine = 192 /* CloudShield architecture family */
+	EM_COREA_1ST     Machine = 193 /* KIPO-KAIST Core-A 1st generation processor family */
+	EM_COREA_2ND     Machine = 194 /* KIPO-KAIST Core-A 2nd generation processor family */
+	EM_ARC_COMPACT2  Machine = 195 /* Synopsys ARCompact V2 */
+	EM_OPEN8         Machine = 196 /* Open8 8-bit RISC soft processor core */
+	EM_RL78          Machine = 197 /* Renesas RL78 family */
+	EM_VIDEOCORE5    Machine = 198 /* Broadcom VideoCore V processor */
+	EM_78KOR         Machine = 199 /* Renesas 78KOR family */
+	EM_56800EX       Machine = 200 /* Freescale 56800EX Digital Signal Controller (DSC) */
+	EM_BA1           Machine = 201 /* Beyond BA1 CPU architecture */
+	EM_BA2           Machine = 202 /* Beyond BA2 CPU architecture */
+	EM_XCORE         Machine = 203 /* XMOS xCORE processor family */
+	EM_MCHP_PIC      Machine = 204 /* Microchip 8-bit PIC(r) family */
+	EM_INTEL205      Machine = 205 /* Reserved by Intel */
+	EM_INTEL206      Machine = 206 /* Reserved by Intel */
+	EM_INTEL207      Machine = 207 /* Reserved by Intel */
+	EM_INTEL208      Machine = 208 /* Reserved by Intel */
+	EM_INTEL209      Machine = 209 /* Reserved by Intel */
+	EM_KM32          Machine = 210 /* KM211 KM32 32-bit processor */
+	EM_KMX32         Machine = 211 /* KM211 KMX32 32-bit processor */
+	EM_KMX16         Machine = 212 /* KM211 KMX16 16-bit processor */
+	EM_KMX8          Machine = 213 /* KM211 KMX8 8-bit processor */
+	EM_KVARC         Machine = 214 /* KM211 KVARC processor */
+	EM_CDP           Machine = 215 /* Paneve CDP architecture family */
+	EM_COGE          Machine = 216 /* Cognitive Smart Memory Processor */
+	EM_COOL          Machine = 217 /* Bluechip Systems CoolEngine */
+	EM_NORC          Machine = 218 /* Nanoradio Optimized RISC */
+	EM_CSR_KALIMBA   Machine = 219 /* CSR Kalimba architecture family */
+	EM_Z80           Machine = 220 /* Zilog Z80 */
+	EM_VISIUM        Machine = 221 /* Controls and Data Services VISIUMcore processor */
+	EM_FT32          Machine = 222 /* FTDI Chip FT32 high performance 32-bit RISC architecture */
+	EM_MOXIE         Machine = 223 /* Moxie processor family */
+	EM_AMDGPU        Machine = 224 /* AMD GPU architecture */
+	EM_RISCV         Machine = 243 /* RISC-V */
+	EM_LANAI         Machine = 244 /* Lanai 32-bit processor */
+	EM_BPF           Machine = 247 /* Linux BPF – in-kernel virtual machine */
+
+	/* Non-standard or deprecated. */
+	EM_486         Machine = 6      /* Intel i486. */
+	EM_MIPS_RS4_BE Machine = 10     /* MIPS R4000 Big-Endian */
+	EM_ALPHA_STD   Machine = 41     /* Digital Alpha (standard value). */
+	EM_ALPHA       Machine = 0x9026 /* Alpha (written in the absence of an ABI) */
+)
+
+var machineStrings = []intName{
+	{0, "EM_NONE"},
+	{1, "EM_M32"},
+	{2, "EM_SPARC"},
+	{3, "EM_386"},
+	{4, "EM_68K"},
+	{5, "EM_88K"},
+	{7, "EM_860"},
+	{8, "EM_MIPS"},
+	{9, "EM_S370"},
+	{10, "EM_MIPS_RS3_LE"},
+	{15, "EM_PARISC"},
+	{17, "EM_VPP500"},
+	{18, "EM_SPARC32PLUS"},
+	{19, "EM_960"},
+	{20, "EM_PPC"},
+	{21, "EM_PPC64"},
+	{22, "EM_S390"},
+	{36, "EM_V800"},
+	{37, "EM_FR20"},
+	{38, "EM_RH32"},
+	{39, "EM_RCE"},
+	{40, "EM_ARM"},
+	{42, "EM_SH"},
+	{43, "EM_SPARCV9"},
+	{44, "EM_TRICORE"},
+	{45, "EM_ARC"},
+	{46, "EM_H8_300"},
+	{47, "EM_H8_300H"},
+	{48, "EM_H8S"},
+	{49, "EM_H8_500"},
+	{50, "EM_IA_64"},
+	{51, "EM_MIPS_X"},
+	{52, "EM_COLDFIRE"},
+	{53, "EM_68HC12"},
+	{54, "EM_MMA"},
+	{55, "EM_PCP"},
+	{56, "EM_NCPU"},
+	{57, "EM_NDR1"},
+	{58, "EM_STARCORE"},
+	{59, "EM_ME16"},
+	{60, "EM_ST100"},
+	{61, "EM_TINYJ"},
+	{62, "EM_X86_64"},
+	{63, "EM_PDSP"},
+	{64, "EM_PDP10"},
+	{65, "EM_PDP11"},
+	{66, "EM_FX66"},
+	{67, "EM_ST9PLUS"},
+	{68, "EM_ST7"},
+	{69, "EM_68HC16"},
+	{70, "EM_68HC11"},
+	{71, "EM_68HC08"},
+	{72, "EM_68HC05"},
+	{73, "EM_SVX"},
+	{74, "EM_ST19"},
+	{75, "EM_VAX"},
+	{76, "EM_CRIS"},
+	{77, "EM_JAVELIN"},
+	{78, "EM_FIREPATH"},
+	{79, "EM_ZSP"},
+	{80, "EM_MMIX"},
+	{81, "EM_HUANY"},
+	{82, "EM_PRISM"},
+	{83, "EM_AVR"},
+	{84, "EM_FR30"},
+	{85, "EM_D10V"},
+	{86, "EM_D30V"},
+	{87, "EM_V850"},
+	{88, "EM_M32R"},
+	{89, "EM_MN10300"},
+	{90, "EM_MN10200"},
+	{91, "EM_PJ"},
+	{92, "EM_OPENRISC"},
+	{93, "EM_ARC_COMPACT"},
+	{94, "EM_XTENSA"},
+	{95, "EM_VIDEOCORE"},
+	{96, "EM_TMM_GPP"},
+	{97, "EM_NS32K"},
+	{98, "EM_TPC"},
+	{99, "EM_SNP1K"},
+	{100, "EM_ST200"},
+	{101, "EM_IP2K"},
+	{102, "EM_MAX"},
+	{103, "EM_CR"},
+	{104, "EM_F2MC16"},
+	{105, "EM_MSP430"},
+	{106, "EM_BLACKFIN"},
+	{107, "EM_SE_C33"},
+	{108, "EM_SEP"},
+	{109, "EM_ARCA"},
+	{110, "EM_UNICORE"},
+	{111, "EM_EXCESS"},
+	{112, "EM_DXP"},
+	{113, "EM_ALTERA_NIOS2"},
+	{114, "EM_CRX"},
+	{115, "EM_XGATE"},
+	{116, "EM_C166"},
+	{117, "EM_M16C"},
+	{118, "EM_DSPIC30F"},
+	{119, "EM_CE"},
+	{120, "EM_M32C"},
+	{131, "EM_TSK3000"},
+	{132, "EM_RS08"},
+	{133, "EM_SHARC"},
+	{134, "EM_ECOG2"},
+	{135, "EM_SCORE7"},
+	{136, "EM_DSP24"},
+	{137, "EM_VIDEOCORE3"},
+	{138, "EM_LATTICEMICO32"},
+	{139, "EM_SE_C17"},
+	{140, "EM_TI_C6000"},
+	{141, "EM_TI_C2000"},
+	{142, "EM_TI_C5500"},
+	{143, "EM_TI_ARP32"},
+	{144, "EM_TI_PRU"},
+	{160, "EM_MMDSP_PLUS"},
+	{161, "EM_CYPRESS_M8C"},
+	{162, "EM_R32C"},
+	{163, "EM_TRIMEDIA"},
+	{164, "EM_QDSP6"},
+	{165, "EM_8051"},
+	{166, "EM_STXP7X"},
+	{167, "EM_NDS32"},
+	{168, "EM_ECOG1"},
+	{168, "EM_ECOG1X"},
+	{169, "EM_MAXQ30"},
+	{170, "EM_XIMO16"},
+	{171, "EM_MANIK"},
+	{172, "EM_CRAYNV2"},
+	{173, "EM_RX"},
+	{174, "EM_METAG"},
+	{175, "EM_MCST_ELBRUS"},
+	{176, "EM_ECOG16"},
+	{177, "EM_CR16"},
+	{178, "EM_ETPU"},
+	{179, "EM_SLE9X"},
+	{180, "EM_L10M"},
+	{181, "EM_K10M"},
+	{183, "EM_AARCH64"},
+	{185, "EM_AVR32"},
+	{186, "EM_STM8"},
+	{187, "EM_TILE64"},
+	{188, "EM_TILEPRO"},
+	{189, "EM_MICROBLAZE"},
+	{190, "EM_CUDA"},
+	{191, "EM_TILEGX"},
+	{192, "EM_CLOUDSHIELD"},
+	{193, "EM_COREA_1ST"},
+	{194, "EM_COREA_2ND"},
+	{195, "EM_ARC_COMPACT2"},
+	{196, "EM_OPEN8"},
+	{197, "EM_RL78"},
+	{198, "EM_VIDEOCORE5"},
+	{199, "EM_78KOR"},
+	{200, "EM_56800EX"},
+	{201, "EM_BA1"},
+	{202, "EM_BA2"},
+	{203, "EM_XCORE"},
+	{204, "EM_MCHP_PIC"},
+	{205, "EM_INTEL205"},
+	{206, "EM_INTEL206"},
+	{207, "EM_INTEL207"},
+	{208, "EM_INTEL208"},
+	{209, "EM_INTEL209"},
+	{210, "EM_KM32"},
+	{211, "EM_KMX32"},
+	{212, "EM_KMX16"},
+	{213, "EM_KMX8"},
+	{214, "EM_KVARC"},
+	{215, "EM_CDP"},
+	{216, "EM_COGE"},
+	{217, "EM_COOL"},
+	{218, "EM_NORC"},
+	{219, "EM_CSR_KALIMBA "},
+	{220, "EM_Z80 "},
+	{221, "EM_VISIUM "},
+	{222, "EM_FT32 "},
+	{223, "EM_MOXIE"},
+	{224, "EM_AMDGPU"},
+	{243, "EM_RISCV"},
+	{244, "EM_LANAI"},
+	{247, "EM_BPF"},
+
+	/* Non-standard or deprecated. */
+	{6, "EM_486"},
+	{10, "EM_MIPS_RS4_BE"},
+	{41, "EM_ALPHA_STD"},
+	{0x9026, "EM_ALPHA"},
+}
+
+func (i Machine) String() string   { return stringName(uint32(i), machineStrings, false) }
+func (i Machine) GoString() string { return stringName(uint32(i), machineStrings, true) }
+
+// Special section indices.
+type SectionIndex int
+
+const (
+	SHN_UNDEF     SectionIndex = 0      /* Undefined, missing, irrelevant. */
+	SHN_LORESERVE SectionIndex = 0xff00 /* First of reserved range. */
+	SHN_LOPROC    SectionIndex = 0xff00 /* First processor-specific. */
+	SHN_HIPROC    SectionIndex = 0xff1f /* Last processor-specific. */
+	SHN_LOOS      SectionIndex = 0xff20 /* First operating system-specific. */
+	SHN_HIOS      SectionIndex = 0xff3f /* Last operating system-specific. */
+	SHN_ABS       SectionIndex = 0xfff1 /* Absolute values. */
+	SHN_COMMON    SectionIndex = 0xfff2 /* Common data. */
+	SHN_XINDEX    SectionIndex = 0xffff /* Escape; index stored elsewhere. */
+	SHN_HIRESERVE SectionIndex = 0xffff /* Last of reserved range. */
+)
+
+var shnStrings = []intName{
+	{0, "SHN_UNDEF"},
+	{0xff00, "SHN_LOPROC"},
+	{0xff20, "SHN_LOOS"},
+	{0xfff1, "SHN_ABS"},
+	{0xfff2, "SHN_COMMON"},
+	{0xffff, "SHN_XINDEX"},
+}
+
+func (i SectionIndex) String() string   { return stringName(uint32(i), shnStrings, false) }
+func (i SectionIndex) GoString() string { return stringName(uint32(i), shnStrings, true) }
+
+// Section type.
+type SectionType uint32
+
+const (
+	SHT_NULL           SectionType = 0          /* inactive */
+	SHT_PROGBITS       SectionType = 1          /* program defined information */
+	SHT_SYMTAB         SectionType = 2          /* symbol table section */
+	SHT_STRTAB         SectionType = 3          /* string table section */
+	SHT_RELA           SectionType = 4          /* relocation section with addends */
+	SHT_HASH           SectionType = 5          /* symbol hash table section */
+	SHT_DYNAMIC        SectionType = 6          /* dynamic section */
+	SHT_NOTE           SectionType = 7          /* note section */
+	SHT_NOBITS         SectionType = 8          /* no space section */
+	SHT_REL            SectionType = 9          /* relocation section - no addends */
+	SHT_SHLIB          SectionType = 10         /* reserved - purpose unknown */
+	SHT_DYNSYM         SectionType = 11         /* dynamic symbol table section */
+	SHT_INIT_ARRAY     SectionType = 14         /* Initialization function pointers. */
+	SHT_FINI_ARRAY     SectionType = 15         /* Termination function pointers. */
+	SHT_PREINIT_ARRAY  SectionType = 16         /* Pre-initialization function ptrs. */
+	SHT_GROUP          SectionType = 17         /* Section group. */
+	SHT_SYMTAB_SHNDX   SectionType = 18         /* Section indexes (see SHN_XINDEX). */
+	SHT_LOOS           SectionType = 0x60000000 /* First of OS specific semantics */
+	SHT_GNU_ATTRIBUTES SectionType = 0x6ffffff5 /* GNU object attributes */
+	SHT_GNU_HASH       SectionType = 0x6ffffff6 /* GNU hash table */
+	SHT_GNU_LIBLIST    SectionType = 0x6ffffff7 /* GNU prelink library list */
+	SHT_GNU_VERDEF     SectionType = 0x6ffffffd /* GNU version definition section */
+	SHT_GNU_VERNEED    SectionType = 0x6ffffffe /* GNU version needs section */
+	SHT_GNU_VERSYM     SectionType = 0x6fffffff /* GNU version symbol table */
+	SHT_HIOS           SectionType = 0x6fffffff /* Last of OS specific semantics */
+	SHT_LOPROC         SectionType = 0x70000000 /* reserved range for processor */
+	SHT_MIPS_ABIFLAGS  SectionType = 0x7000002a /* .MIPS.abiflags */
+	SHT_HIPROC         SectionType = 0x7fffffff /* specific section header types */
+	SHT_LOUSER         SectionType = 0x80000000 /* reserved range for application */
+	SHT_HIUSER         SectionType = 0xffffffff /* specific indexes */
+)
+
+var shtStrings = []intName{
+	{0, "SHT_NULL"},
+	{1, "SHT_PROGBITS"},
+	{2, "SHT_SYMTAB"},
+	{3, "SHT_STRTAB"},
+	{4, "SHT_RELA"},
+	{5, "SHT_HASH"},
+	{6, "SHT_DYNAMIC"},
+	{7, "SHT_NOTE"},
+	{8, "SHT_NOBITS"},
+	{9, "SHT_REL"},
+	{10, "SHT_SHLIB"},
+	{11, "SHT_DYNSYM"},
+	{14, "SHT_INIT_ARRAY"},
+	{15, "SHT_FINI_ARRAY"},
+	{16, "SHT_PREINIT_ARRAY"},
+	{17, "SHT_GROUP"},
+	{18, "SHT_SYMTAB_SHNDX"},
+	{0x60000000, "SHT_LOOS"},
+	{0x6ffffff5, "SHT_GNU_ATTRIBUTES"},
+	{0x6ffffff6, "SHT_GNU_HASH"},
+	{0x6ffffff7, "SHT_GNU_LIBLIST"},
+	{0x6ffffffd, "SHT_GNU_VERDEF"},
+	{0x6ffffffe, "SHT_GNU_VERNEED"},
+	{0x6fffffff, "SHT_GNU_VERSYM"},
+	{0x70000000, "SHT_LOPROC"},
+	{0x7000002a, "SHT_MIPS_ABIFLAGS"},
+	{0x7fffffff, "SHT_HIPROC"},
+	{0x80000000, "SHT_LOUSER"},
+	{0xffffffff, "SHT_HIUSER"},
+}
+
+func (i SectionType) String() string   { return stringName(uint32(i), shtStrings, false) }
+func (i SectionType) GoString() string { return stringName(uint32(i), shtStrings, true) }
+
+// Section flags.
+type SectionFlag uint32
+
+const (
+	SHF_WRITE            SectionFlag = 0x1        /* Section contains writable data. */
+	SHF_ALLOC            SectionFlag = 0x2        /* Section occupies memory. */
+	SHF_EXECINSTR        SectionFlag = 0x4        /* Section contains instructions. */
+	SHF_MERGE            SectionFlag = 0x10       /* Section may be merged. */
+	SHF_STRINGS          SectionFlag = 0x20       /* Section contains strings. */
+	SHF_INFO_LINK        SectionFlag = 0x40       /* sh_info holds section index. */
+	SHF_LINK_ORDER       SectionFlag = 0x80       /* Special ordering requirements. */
+	SHF_OS_NONCONFORMING SectionFlag = 0x100      /* OS-specific processing required. */
+	SHF_GROUP            SectionFlag = 0x200      /* Member of section group. */
+	SHF_TLS              SectionFlag = 0x400      /* Section contains TLS data. */
+	SHF_COMPRESSED       SectionFlag = 0x800      /* Section is compressed. */
+	SHF_MASKOS           SectionFlag = 0x0ff00000 /* OS-specific semantics. */
+	SHF_MASKPROC         SectionFlag = 0xf0000000 /* Processor-specific semantics. */
+)
+
+var shfStrings = []intName{
+	{0x1, "SHF_WRITE"},
+	{0x2, "SHF_ALLOC"},
+	{0x4, "SHF_EXECINSTR"},
+	{0x10, "SHF_MERGE"},
+	{0x20, "SHF_STRINGS"},
+	{0x40, "SHF_INFO_LINK"},
+	{0x80, "SHF_LINK_ORDER"},
+	{0x100, "SHF_OS_NONCONFORMING"},
+	{0x200, "SHF_GROUP"},
+	{0x400, "SHF_TLS"},
+	{0x800, "SHF_COMPRESSED"},
+}
+
+func (i SectionFlag) String() string   { return flagName(uint32(i), shfStrings, false) }
+func (i SectionFlag) GoString() string { return flagName(uint32(i), shfStrings, true) }
+
+// Section compression type.
+type CompressionType int
+
+const (
+	COMPRESS_ZLIB   CompressionType = 1          /* ZLIB compression. */
+	COMPRESS_LOOS   CompressionType = 0x60000000 /* First OS-specific. */
+	COMPRESS_HIOS   CompressionType = 0x6fffffff /* Last OS-specific. */
+	COMPRESS_LOPROC CompressionType = 0x70000000 /* First processor-specific type. */
+	COMPRESS_HIPROC CompressionType = 0x7fffffff /* Last processor-specific type. */
+)
+
+var compressionStrings = []intName{
+	{0, "COMPRESS_ZLIB"},
+	{0x60000000, "COMPRESS_LOOS"},
+	{0x6fffffff, "COMPRESS_HIOS"},
+	{0x70000000, "COMPRESS_LOPROC"},
+	{0x7fffffff, "COMPRESS_HIPROC"},
+}
+
+func (i CompressionType) String() string   { return stringName(uint32(i), compressionStrings, false) }
+func (i CompressionType) GoString() string { return stringName(uint32(i), compressionStrings, true) }
+
+// Prog.Type
+type ProgType int
+
+const (
+	PT_NULL    ProgType = 0 /* Unused entry. */
+	PT_LOAD    ProgType = 1 /* Loadable segment. */
+	PT_DYNAMIC ProgType = 2 /* Dynamic linking information segment. */
+	PT_INTERP  ProgType = 3 /* Pathname of interpreter. */
+	PT_NOTE    ProgType = 4 /* Auxiliary information. */
+	PT_SHLIB   ProgType = 5 /* Reserved (not used). */
+	PT_PHDR    ProgType = 6 /* Location of program header itself. */
+	PT_TLS     ProgType = 7 /* Thread local storage segment */
+
+	PT_LOOS ProgType = 0x60000000 /* First OS-specific. */
+
+	PT_GNU_EH_FRAME ProgType = 0x6474e550 /* Frame unwind information */
+	PT_GNU_STACK    ProgType = 0x6474e551 /* Stack flags */
+	PT_GNU_RELRO    ProgType = 0x6474e552 /* Read only after relocs */
+	PT_GNU_PROPERTY ProgType = 0x6474e553 /* GNU property */
+	PT_GNU_MBIND_LO ProgType = 0x6474e555 /* Mbind segments start */
+	PT_GNU_MBIND_HI ProgType = 0x6474f554 /* Mbind segments finish */
+
+	PT_PAX_FLAGS ProgType = 0x65041580 /* PAX flags */
+
+	PT_OPENBSD_RANDOMIZE ProgType = 0x65a3dbe6 /* Random data */
+	PT_OPENBSD_WXNEEDED  ProgType = 0x65a3dbe7 /* W^X violations */
+	PT_OPENBSD_BOOTDATA  ProgType = 0x65a41be6 /* Boot arguments */
+
+	PT_SUNW_EH_FRAME ProgType = 0x6474e550 /* Frame unwind information */
+	PT_SUNWSTACK     ProgType = 0x6ffffffb /* Stack segment */
+
+	PT_HIOS ProgType = 0x6fffffff /* Last OS-specific. */
+
+	PT_LOPROC ProgType = 0x70000000 /* First processor-specific type. */
+
+	PT_ARM_ARCHEXT ProgType = 0x70000000 /* Architecture compatibility */
+	PT_ARM_EXIDX   ProgType = 0x70000001 /* Exception unwind tables */
+
+	PT_AARCH64_ARCHEXT ProgType = 0x70000000 /* Architecture compatibility */
+	PT_AARCH64_UNWIND  ProgType = 0x70000001 /* Exception unwind tables */
+
+	PT_MIPS_REGINFO  ProgType = 0x70000000 /* Register usage */
+	PT_MIPS_RTPROC   ProgType = 0x70000001 /* Runtime procedures */
+	PT_MIPS_OPTIONS  ProgType = 0x70000002 /* Options */
+	PT_MIPS_ABIFLAGS ProgType = 0x70000003 /* ABI flags */
+
+	PT_S390_PGSTE ProgType = 0x70000000 /* 4k page table size */
+
+	PT_HIPROC ProgType = 0x7fffffff /* Last processor-specific type. */
+)
+
+var ptStrings = []intName{
+	{0, "PT_NULL"},
+	{1, "PT_LOAD"},
+	{2, "PT_DYNAMIC"},
+	{3, "PT_INTERP"},
+	{4, "PT_NOTE"},
+	{5, "PT_SHLIB"},
+	{6, "PT_PHDR"},
+	{7, "PT_TLS"},
+	{0x60000000, "PT_LOOS"},
+	{0x6474e550, "PT_GNU_EH_FRAME"},
+	{0x6474e551, "PT_GNU_STACK"},
+	{0x6474e552, "PT_GNU_RELRO"},
+	{0x6474e553, "PT_GNU_PROPERTY"},
+	{0x65041580, "PT_PAX_FLAGS"},
+	{0x65a3dbe6, "PT_OPENBSD_RANDOMIZE"},
+	{0x65a3dbe7, "PT_OPENBSD_WXNEEDED"},
+	{0x65a41be6, "PT_OPENBSD_BOOTDATA"},
+	{0x6ffffffb, "PT_SUNWSTACK"},
+	{0x6fffffff, "PT_HIOS"},
+	{0x70000000, "PT_LOPROC"},
+	// We don't list the processor-dependent ProgTypes,
+	// as the values overlap.
+	{0x7fffffff, "PT_HIPROC"},
+}
+
+func (i ProgType) String() string   { return stringName(uint32(i), ptStrings, false) }
+func (i ProgType) GoString() string { return stringName(uint32(i), ptStrings, true) }
+
+// Prog.Flag
+type ProgFlag uint32
+
+const (
+	PF_X        ProgFlag = 0x1        /* Executable. */
+	PF_W        ProgFlag = 0x2        /* Writable. */
+	PF_R        ProgFlag = 0x4        /* Readable. */
+	PF_MASKOS   ProgFlag = 0x0ff00000 /* Operating system-specific. */
+	PF_MASKPROC ProgFlag = 0xf0000000 /* Processor-specific. */
+)
+
+var pfStrings = []intName{
+	{0x1, "PF_X"},
+	{0x2, "PF_W"},
+	{0x4, "PF_R"},
+}
+
+func (i ProgFlag) String() string   { return flagName(uint32(i), pfStrings, false) }
+func (i ProgFlag) GoString() string { return flagName(uint32(i), pfStrings, true) }
+
+// Dyn.Tag
+type DynTag int
+
+const (
+	DT_NULL         DynTag = 0  /* Terminating entry. */
+	DT_NEEDED       DynTag = 1  /* String table offset of a needed shared library. */
+	DT_PLTRELSZ     DynTag = 2  /* Total size in bytes of PLT relocations. */
+	DT_PLTGOT       DynTag = 3  /* Processor-dependent address. */
+	DT_HASH         DynTag = 4  /* Address of symbol hash table. */
+	DT_STRTAB       DynTag = 5  /* Address of string table. */
+	DT_SYMTAB       DynTag = 6  /* Address of symbol table. */
+	DT_RELA         DynTag = 7  /* Address of ElfNN_Rela relocations. */
+	DT_RELASZ       DynTag = 8  /* Total size of ElfNN_Rela relocations. */
+	DT_RELAENT      DynTag = 9  /* Size of each ElfNN_Rela relocation entry. */
+	DT_STRSZ        DynTag = 10 /* Size of string table. */
+	DT_SYMENT       DynTag = 11 /* Size of each symbol table entry. */
+	DT_INIT         DynTag = 12 /* Address of initialization function. */
+	DT_FINI         DynTag = 13 /* Address of finalization function. */
+	DT_SONAME       DynTag = 14 /* String table offset of shared object name. */
+	DT_RPATH        DynTag = 15 /* String table offset of library path. [sup] */
+	DT_SYMBOLIC     DynTag = 16 /* Indicates "symbolic" linking. [sup] */
+	DT_REL          DynTag = 17 /* Address of ElfNN_Rel relocations. */
+	DT_RELSZ        DynTag = 18 /* Total size of ElfNN_Rel relocations. */
+	DT_RELENT       DynTag = 19 /* Size of each ElfNN_Rel relocation. */
+	DT_PLTREL       DynTag = 20 /* Type of relocation used for PLT. */
+	DT_DEBUG        DynTag = 21 /* Reserved (not used). */
+	DT_TEXTREL      DynTag = 22 /* Indicates there may be relocations in non-writable segments. [sup] */
+	DT_JMPREL       DynTag = 23 /* Address of PLT relocations. */
+	DT_BIND_NOW     DynTag = 24 /* [sup] */
+	DT_INIT_ARRAY   DynTag = 25 /* Address of the array of pointers to initialization functions */
+	DT_FINI_ARRAY   DynTag = 26 /* Address of the array of pointers to termination functions */
+	DT_INIT_ARRAYSZ DynTag = 27 /* Size in bytes of the array of initialization functions. */
+	DT_FINI_ARRAYSZ DynTag = 28 /* Size in bytes of the array of termination functions. */
+	DT_RUNPATH      DynTag = 29 /* String table offset of a null-terminated library search path string. */
+	DT_FLAGS        DynTag = 30 /* Object specific flag values. */
+	DT_ENCODING     DynTag = 32 /* Values greater than or equal to DT_ENCODING
+	   and less than DT_LOOS follow the rules for
+	   the interpretation of the d_un union
+	   as follows: even == 'd_ptr', even == 'd_val'
+	   or none */
+	DT_PREINIT_ARRAY   DynTag = 32 /* Address of the array of pointers to pre-initialization functions. */
+	DT_PREINIT_ARRAYSZ DynTag = 33 /* Size in bytes of the array of pre-initialization functions. */
+	DT_SYMTAB_SHNDX    DynTag = 34 /* Address of SHT_SYMTAB_SHNDX section. */
+
+	DT_LOOS DynTag = 0x6000000d /* First OS-specific */
+	DT_HIOS DynTag = 0x6ffff000 /* Last OS-specific */
+
+	DT_VALRNGLO       DynTag = 0x6ffffd00
+	DT_GNU_PRELINKED  DynTag = 0x6ffffdf5
+	DT_GNU_CONFLICTSZ DynTag = 0x6ffffdf6
+	DT_GNU_LIBLISTSZ  DynTag = 0x6ffffdf7
+	DT_CHECKSUM       DynTag = 0x6ffffdf8
+	DT_PLTPADSZ       DynTag = 0x6ffffdf9
+	DT_MOVEENT        DynTag = 0x6ffffdfa
+	DT_MOVESZ         DynTag = 0x6ffffdfb
+	DT_FEATURE        DynTag = 0x6ffffdfc
+	DT_POSFLAG_1      DynTag = 0x6ffffdfd
+	DT_SYMINSZ        DynTag = 0x6ffffdfe
+	DT_SYMINENT       DynTag = 0x6ffffdff
+	DT_VALRNGHI       DynTag = 0x6ffffdff
+
+	DT_ADDRRNGLO    DynTag = 0x6ffffe00
+	DT_GNU_HASH     DynTag = 0x6ffffef5
+	DT_TLSDESC_PLT  DynTag = 0x6ffffef6
+	DT_TLSDESC_GOT  DynTag = 0x6ffffef7
+	DT_GNU_CONFLICT DynTag = 0x6ffffef8
+	DT_GNU_LIBLIST  DynTag = 0x6ffffef9
+	DT_CONFIG       DynTag = 0x6ffffefa
+	DT_DEPAUDIT     DynTag = 0x6ffffefb
+	DT_AUDIT        DynTag = 0x6ffffefc
+	DT_PLTPAD       DynTag = 0x6ffffefd
+	DT_MOVETAB      DynTag = 0x6ffffefe
+	DT_SYMINFO      DynTag = 0x6ffffeff
+	DT_ADDRRNGHI    DynTag = 0x6ffffeff
+
+	DT_VERSYM     DynTag = 0x6ffffff0
+	DT_RELACOUNT  DynTag = 0x6ffffff9
+	DT_RELCOUNT   DynTag = 0x6ffffffa
+	DT_FLAGS_1    DynTag = 0x6ffffffb
+	DT_VERDEF     DynTag = 0x6ffffffc
+	DT_VERDEFNUM  DynTag = 0x6ffffffd
+	DT_VERNEED    DynTag = 0x6ffffffe
+	DT_VERNEEDNUM DynTag = 0x6fffffff
+
+	DT_LOPROC DynTag = 0x70000000 /* First processor-specific type. */
+
+	DT_MIPS_RLD_VERSION           DynTag = 0x70000001
+	DT_MIPS_TIME_STAMP            DynTag = 0x70000002
+	DT_MIPS_ICHECKSUM             DynTag = 0x70000003
+	DT_MIPS_IVERSION              DynTag = 0x70000004
+	DT_MIPS_FLAGS                 DynTag = 0x70000005
+	DT_MIPS_BASE_ADDRESS          DynTag = 0x70000006
+	DT_MIPS_MSYM                  DynTag = 0x70000007
+	DT_MIPS_CONFLICT              DynTag = 0x70000008
+	DT_MIPS_LIBLIST               DynTag = 0x70000009
+	DT_MIPS_LOCAL_GOTNO           DynTag = 0x7000000a
+	DT_MIPS_CONFLICTNO            DynTag = 0x7000000b
+	DT_MIPS_LIBLISTNO             DynTag = 0x70000010
+	DT_MIPS_SYMTABNO              DynTag = 0x70000011
+	DT_MIPS_UNREFEXTNO            DynTag = 0x70000012
+	DT_MIPS_GOTSYM                DynTag = 0x70000013
+	DT_MIPS_HIPAGENO              DynTag = 0x70000014
+	DT_MIPS_RLD_MAP               DynTag = 0x70000016
+	DT_MIPS_DELTA_CLASS           DynTag = 0x70000017
+	DT_MIPS_DELTA_CLASS_NO        DynTag = 0x70000018
+	DT_MIPS_DELTA_INSTANCE        DynTag = 0x70000019
+	DT_MIPS_DELTA_INSTANCE_NO     DynTag = 0x7000001a
+	DT_MIPS_DELTA_RELOC           DynTag = 0x7000001b
+	DT_MIPS_DELTA_RELOC_NO        DynTag = 0x7000001c
+	DT_MIPS_DELTA_SYM             DynTag = 0x7000001d
+	DT_MIPS_DELTA_SYM_NO          DynTag = 0x7000001e
+	DT_MIPS_DELTA_CLASSSYM        DynTag = 0x70000020
+	DT_MIPS_DELTA_CLASSSYM_NO     DynTag = 0x70000021
+	DT_MIPS_CXX_FLAGS             DynTag = 0x70000022
+	DT_MIPS_PIXIE_INIT            DynTag = 0x70000023
+	DT_MIPS_SYMBOL_LIB            DynTag = 0x70000024
+	DT_MIPS_LOCALPAGE_GOTIDX      DynTag = 0x70000025
+	DT_MIPS_LOCAL_GOTIDX          DynTag = 0x70000026
+	DT_MIPS_HIDDEN_GOTIDX         DynTag = 0x70000027
+	DT_MIPS_PROTECTED_GOTIDX      DynTag = 0x70000028
+	DT_MIPS_OPTIONS               DynTag = 0x70000029
+	DT_MIPS_INTERFACE             DynTag = 0x7000002a
+	DT_MIPS_DYNSTR_ALIGN          DynTag = 0x7000002b
+	DT_MIPS_INTERFACE_SIZE        DynTag = 0x7000002c
+	DT_MIPS_RLD_TEXT_RESOLVE_ADDR DynTag = 0x7000002d
+	DT_MIPS_PERF_SUFFIX           DynTag = 0x7000002e
+	DT_MIPS_COMPACT_SIZE          DynTag = 0x7000002f
+	DT_MIPS_GP_VALUE              DynTag = 0x70000030
+	DT_MIPS_AUX_DYNAMIC           DynTag = 0x70000031
+	DT_MIPS_PLTGOT                DynTag = 0x70000032
+	DT_MIPS_RWPLT                 DynTag = 0x70000034
+	DT_MIPS_RLD_MAP_REL           DynTag = 0x70000035
+
+	DT_PPC_GOT DynTag = 0x70000000
+	DT_PPC_OPT DynTag = 0x70000001
+
+	DT_PPC64_GLINK DynTag = 0x70000000
+	DT_PPC64_OPD   DynTag = 0x70000001
+	DT_PPC64_OPDSZ DynTag = 0x70000002
+	DT_PPC64_OPT   DynTag = 0x70000003
+
+	DT_SPARC_REGISTER DynTag = 0x70000001
+
+	DT_AUXILIARY DynTag = 0x7ffffffd
+	DT_USED      DynTag = 0x7ffffffe
+	DT_FILTER    DynTag = 0x7fffffff
+
+	DT_HIPROC DynTag = 0x7fffffff /* Last processor-specific type. */
+)
+
+var dtStrings = []intName{
+	{0, "DT_NULL"},
+	{1, "DT_NEEDED"},
+	{2, "DT_PLTRELSZ"},
+	{3, "DT_PLTGOT"},
+	{4, "DT_HASH"},
+	{5, "DT_STRTAB"},
+	{6, "DT_SYMTAB"},
+	{7, "DT_RELA"},
+	{8, "DT_RELASZ"},
+	{9, "DT_RELAENT"},
+	{10, "DT_STRSZ"},
+	{11, "DT_SYMENT"},
+	{12, "DT_INIT"},
+	{13, "DT_FINI"},
+	{14, "DT_SONAME"},
+	{15, "DT_RPATH"},
+	{16, "DT_SYMBOLIC"},
+	{17, "DT_REL"},
+	{18, "DT_RELSZ"},
+	{19, "DT_RELENT"},
+	{20, "DT_PLTREL"},
+	{21, "DT_DEBUG"},
+	{22, "DT_TEXTREL"},
+	{23, "DT_JMPREL"},
+	{24, "DT_BIND_NOW"},
+	{25, "DT_INIT_ARRAY"},
+	{26, "DT_FINI_ARRAY"},
+	{27, "DT_INIT_ARRAYSZ"},
+	{28, "DT_FINI_ARRAYSZ"},
+	{29, "DT_RUNPATH"},
+	{30, "DT_FLAGS"},
+	{32, "DT_ENCODING"},
+	{32, "DT_PREINIT_ARRAY"},
+	{33, "DT_PREINIT_ARRAYSZ"},
+	{34, "DT_SYMTAB_SHNDX"},
+	{0x6000000d, "DT_LOOS"},
+	{0x6ffff000, "DT_HIOS"},
+	{0x6ffffd00, "DT_VALRNGLO"},
+	{0x6ffffdf5, "DT_GNU_PRELINKED"},
+	{0x6ffffdf6, "DT_GNU_CONFLICTSZ"},
+	{0x6ffffdf7, "DT_GNU_LIBLISTSZ"},
+	{0x6ffffdf8, "DT_CHECKSUM"},
+	{0x6ffffdf9, "DT_PLTPADSZ"},
+	{0x6ffffdfa, "DT_MOVEENT"},
+	{0x6ffffdfb, "DT_MOVESZ"},
+	{0x6ffffdfc, "DT_FEATURE"},
+	{0x6ffffdfd, "DT_POSFLAG_1"},
+	{0x6ffffdfe, "DT_SYMINSZ"},
+	{0x6ffffdff, "DT_SYMINENT"},
+	{0x6ffffdff, "DT_VALRNGHI"},
+	{0x6ffffe00, "DT_ADDRRNGLO"},
+	{0x6ffffef5, "DT_GNU_HASH"},
+	{0x6ffffef6, "DT_TLSDESC_PLT"},
+	{0x6ffffef7, "DT_TLSDESC_GOT"},
+	{0x6ffffef8, "DT_GNU_CONFLICT"},
+	{0x6ffffef9, "DT_GNU_LIBLIST"},
+	{0x6ffffefa, "DT_CONFIG"},
+	{0x6ffffefb, "DT_DEPAUDIT"},
+	{0x6ffffefc, "DT_AUDIT"},
+	{0x6ffffefd, "DT_PLTPAD"},
+	{0x6ffffefe, "DT_MOVETAB"},
+	{0x6ffffeff, "DT_SYMINFO"},
+	{0x6ffffeff, "DT_ADDRRNGHI"},
+	{0x6ffffff0, "DT_VERSYM"},
+	{0x6ffffff9, "DT_RELACOUNT"},
+	{0x6ffffffa, "DT_RELCOUNT"},
+	{0x6ffffffb, "DT_FLAGS_1"},
+	{0x6ffffffc, "DT_VERDEF"},
+	{0x6ffffffd, "DT_VERDEFNUM"},
+	{0x6ffffffe, "DT_VERNEED"},
+	{0x6fffffff, "DT_VERNEEDNUM"},
+	{0x70000000, "DT_LOPROC"},
+	// We don't list the processor-dependent DynTags,
+	// as the values overlap.
+	{0x7ffffffd, "DT_AUXILIARY"},
+	{0x7ffffffe, "DT_USED"},
+	{0x7fffffff, "DT_FILTER"},
+}
+
+func (i DynTag) String() string   { return stringName(uint32(i), dtStrings, false) }
+func (i DynTag) GoString() string { return stringName(uint32(i), dtStrings, true) }
+
+// DT_FLAGS values.
+type DynFlag int
+
+const (
+	DF_ORIGIN DynFlag = 0x0001 /* Indicates that the object being loaded may
+	   make reference to the
+	   $ORIGIN substitution string */
+	DF_SYMBOLIC DynFlag = 0x0002 /* Indicates "symbolic" linking. */
+	DF_TEXTREL  DynFlag = 0x0004 /* Indicates there may be relocations in non-writable segments. */
+	DF_BIND_NOW DynFlag = 0x0008 /* Indicates that the dynamic linker should
+	   process all relocations for the object
+	   containing this entry before transferring
+	   control to the program. */
+	DF_STATIC_TLS DynFlag = 0x0010 /* Indicates that the shared object or
+	   executable contains code using a static
+	   thread-local storage scheme. */
+)
+
+var dflagStrings = []intName{
+	{0x0001, "DF_ORIGIN"},
+	{0x0002, "DF_SYMBOLIC"},
+	{0x0004, "DF_TEXTREL"},
+	{0x0008, "DF_BIND_NOW"},
+	{0x0010, "DF_STATIC_TLS"},
+}
+
+func (i DynFlag) String() string   { return flagName(uint32(i), dflagStrings, false) }
+func (i DynFlag) GoString() string { return flagName(uint32(i), dflagStrings, true) }
+
+// NType values; used in core files.
+type NType int
+
+const (
+	NT_PRSTATUS NType = 1 /* Process status. */
+	NT_FPREGSET NType = 2 /* Floating point registers. */
+	NT_PRPSINFO NType = 3 /* Process state info. */
+)
+
+var ntypeStrings = []intName{
+	{1, "NT_PRSTATUS"},
+	{2, "NT_FPREGSET"},
+	{3, "NT_PRPSINFO"},
+}
+
+func (i NType) String() string   { return stringName(uint32(i), ntypeStrings, false) }
+func (i NType) GoString() string { return stringName(uint32(i), ntypeStrings, true) }
+
+/* Symbol Binding - ELFNN_ST_BIND - st_info */
+type SymBind int
+
+const (
+	STB_LOCAL  SymBind = 0  /* Local symbol */
+	STB_GLOBAL SymBind = 1  /* Global symbol */
+	STB_WEAK   SymBind = 2  /* like global - lower precedence */
+	STB_LOOS   SymBind = 10 /* Reserved range for operating system */
+	STB_HIOS   SymBind = 12 /*   specific semantics. */
+	STB_LOPROC SymBind = 13 /* reserved range for processor */
+	STB_HIPROC SymBind = 15 /*   specific semantics. */
+)
+
+var stbStrings = []intName{
+	{0, "STB_LOCAL"},
+	{1, "STB_GLOBAL"},
+	{2, "STB_WEAK"},
+	{10, "STB_LOOS"},
+	{12, "STB_HIOS"},
+	{13, "STB_LOPROC"},
+	{15, "STB_HIPROC"},
+}
+
+func (i SymBind) String() string   { return stringName(uint32(i), stbStrings, false) }
+func (i SymBind) GoString() string { return stringName(uint32(i), stbStrings, true) }
+
+/* Symbol type - ELFNN_ST_TYPE - st_info */
+type SymType int
+
+const (
+	STT_NOTYPE  SymType = 0  /* Unspecified type. */
+	STT_OBJECT  SymType = 1  /* Data object. */
+	STT_FUNC    SymType = 2  /* Function. */
+	STT_SECTION SymType = 3  /* Section. */
+	STT_FILE    SymType = 4  /* Source file. */
+	STT_COMMON  SymType = 5  /* Uninitialized common block. */
+	STT_TLS     SymType = 6  /* TLS object. */
+	STT_LOOS    SymType = 10 /* Reserved range for operating system */
+	STT_HIOS    SymType = 12 /*   specific semantics. */
+	STT_LOPROC  SymType = 13 /* reserved range for processor */
+	STT_HIPROC  SymType = 15 /*   specific semantics. */
+)
+
+var sttStrings = []intName{
+	{0, "STT_NOTYPE"},
+	{1, "STT_OBJECT"},
+	{2, "STT_FUNC"},
+	{3, "STT_SECTION"},
+	{4, "STT_FILE"},
+	{5, "STT_COMMON"},
+	{6, "STT_TLS"},
+	{10, "STT_LOOS"},
+	{12, "STT_HIOS"},
+	{13, "STT_LOPROC"},
+	{15, "STT_HIPROC"},
+}
+
+func (i SymType) String() string   { return stringName(uint32(i), sttStrings, false) }
+func (i SymType) GoString() string { return stringName(uint32(i), sttStrings, true) }
+
+/* Symbol visibility - ELFNN_ST_VISIBILITY - st_other */
+type SymVis int
+
+const (
+	STV_DEFAULT   SymVis = 0x0 /* Default visibility (see binding). */
+	STV_INTERNAL  SymVis = 0x1 /* Special meaning in relocatable objects. */
+	STV_HIDDEN    SymVis = 0x2 /* Not visible. */
+	STV_PROTECTED SymVis = 0x3 /* Visible but not preemptible. */
+)
+
+var stvStrings = []intName{
+	{0x0, "STV_DEFAULT"},
+	{0x1, "STV_INTERNAL"},
+	{0x2, "STV_HIDDEN"},
+	{0x3, "STV_PROTECTED"},
+}
+
+func (i SymVis) String() string   { return stringName(uint32(i), stvStrings, false) }
+func (i SymVis) GoString() string { return stringName(uint32(i), stvStrings, true) }
+
+/*
+ * Relocation types.
+ */
+
+// Relocation types for x86-64.
+type R_X86_64 int
+
+const (
+	R_X86_64_NONE            R_X86_64 = 0  /* No relocation. */
+	R_X86_64_64              R_X86_64 = 1  /* Add 64 bit symbol value. */
+	R_X86_64_PC32            R_X86_64 = 2  /* PC-relative 32 bit signed sym value. */
+	R_X86_64_GOT32           R_X86_64 = 3  /* PC-relative 32 bit GOT offset. */
+	R_X86_64_PLT32           R_X86_64 = 4  /* PC-relative 32 bit PLT offset. */
+	R_X86_64_COPY            R_X86_64 = 5  /* Copy data from shared object. */
+	R_X86_64_GLOB_DAT        R_X86_64 = 6  /* Set GOT entry to data address. */
+	R_X86_64_JMP_SLOT        R_X86_64 = 7  /* Set GOT entry to code address. */
+	R_X86_64_RELATIVE        R_X86_64 = 8  /* Add load address of shared object. */
+	R_X86_64_GOTPCREL        R_X86_64 = 9  /* Add 32 bit signed pcrel offset to GOT. */
+	R_X86_64_32              R_X86_64 = 10 /* Add 32 bit zero extended symbol value */
+	R_X86_64_32S             R_X86_64 = 11 /* Add 32 bit sign extended symbol value */
+	R_X86_64_16              R_X86_64 = 12 /* Add 16 bit zero extended symbol value */
+	R_X86_64_PC16            R_X86_64 = 13 /* Add 16 bit signed extended pc relative symbol value */
+	R_X86_64_8               R_X86_64 = 14 /* Add 8 bit zero extended symbol value */
+	R_X86_64_PC8             R_X86_64 = 15 /* Add 8 bit signed extended pc relative symbol value */
+	R_X86_64_DTPMOD64        R_X86_64 = 16 /* ID of module containing symbol */
+	R_X86_64_DTPOFF64        R_X86_64 = 17 /* Offset in TLS block */
+	R_X86_64_TPOFF64         R_X86_64 = 18 /* Offset in static TLS block */
+	R_X86_64_TLSGD           R_X86_64 = 19 /* PC relative offset to GD GOT entry */
+	R_X86_64_TLSLD           R_X86_64 = 20 /* PC relative offset to LD GOT entry */
+	R_X86_64_DTPOFF32        R_X86_64 = 21 /* Offset in TLS block */
+	R_X86_64_GOTTPOFF        R_X86_64 = 22 /* PC relative offset to IE GOT entry */
+	R_X86_64_TPOFF32         R_X86_64 = 23 /* Offset in static TLS block */
+	R_X86_64_PC64            R_X86_64 = 24 /* PC relative 64-bit sign extended symbol value. */
+	R_X86_64_GOTOFF64        R_X86_64 = 25
+	R_X86_64_GOTPC32         R_X86_64 = 26
+	R_X86_64_GOT64           R_X86_64 = 27
+	R_X86_64_GOTPCREL64      R_X86_64 = 28
+	R_X86_64_GOTPC64         R_X86_64 = 29
+	R_X86_64_GOTPLT64        R_X86_64 = 30
+	R_X86_64_PLTOFF64        R_X86_64 = 31
+	R_X86_64_SIZE32          R_X86_64 = 32
+	R_X86_64_SIZE64          R_X86_64 = 33
+	R_X86_64_GOTPC32_TLSDESC R_X86_64 = 34
+	R_X86_64_TLSDESC_CALL    R_X86_64 = 35
+	R_X86_64_TLSDESC         R_X86_64 = 36
+	R_X86_64_IRELATIVE       R_X86_64 = 37
+	R_X86_64_RELATIVE64      R_X86_64 = 38
+	R_X86_64_PC32_BND        R_X86_64 = 39
+	R_X86_64_PLT32_BND       R_X86_64 = 40
+	R_X86_64_GOTPCRELX       R_X86_64 = 41
+	R_X86_64_REX_GOTPCRELX   R_X86_64 = 42
+)
+
+var rx86_64Strings = []intName{
+	{0, "R_X86_64_NONE"},
+	{1, "R_X86_64_64"},
+	{2, "R_X86_64_PC32"},
+	{3, "R_X86_64_GOT32"},
+	{4, "R_X86_64_PLT32"},
+	{5, "R_X86_64_COPY"},
+	{6, "R_X86_64_GLOB_DAT"},
+	{7, "R_X86_64_JMP_SLOT"},
+	{8, "R_X86_64_RELATIVE"},
+	{9, "R_X86_64_GOTPCREL"},
+	{10, "R_X86_64_32"},
+	{11, "R_X86_64_32S"},
+	{12, "R_X86_64_16"},
+	{13, "R_X86_64_PC16"},
+	{14, "R_X86_64_8"},
+	{15, "R_X86_64_PC8"},
+	{16, "R_X86_64_DTPMOD64"},
+	{17, "R_X86_64_DTPOFF64"},
+	{18, "R_X86_64_TPOFF64"},
+	{19, "R_X86_64_TLSGD"},
+	{20, "R_X86_64_TLSLD"},
+	{21, "R_X86_64_DTPOFF32"},
+	{22, "R_X86_64_GOTTPOFF"},
+	{23, "R_X86_64_TPOFF32"},
+	{24, "R_X86_64_PC64"},
+	{25, "R_X86_64_GOTOFF64"},
+	{26, "R_X86_64_GOTPC32"},
+	{27, "R_X86_64_GOT64"},
+	{28, "R_X86_64_GOTPCREL64"},
+	{29, "R_X86_64_GOTPC64"},
+	{30, "R_X86_64_GOTPLT64"},
+	{31, "R_X86_64_PLTOFF64"},
+	{32, "R_X86_64_SIZE32"},
+	{33, "R_X86_64_SIZE64"},
+	{34, "R_X86_64_GOTPC32_TLSDESC"},
+	{35, "R_X86_64_TLSDESC_CALL"},
+	{36, "R_X86_64_TLSDESC"},
+	{37, "R_X86_64_IRELATIVE"},
+	{38, "R_X86_64_RELATIVE64"},
+	{39, "R_X86_64_PC32_BND"},
+	{40, "R_X86_64_PLT32_BND"},
+	{41, "R_X86_64_GOTPCRELX"},
+	{42, "R_X86_64_REX_GOTPCRELX"},
+}
+
+func (i R_X86_64) String() string   { return stringName(uint32(i), rx86_64Strings, false) }
+func (i R_X86_64) GoString() string { return stringName(uint32(i), rx86_64Strings, true) }
+
+// Relocation types for AArch64 (aka arm64)
+type R_AARCH64 int
+
+const (
+	R_AARCH64_NONE                            R_AARCH64 = 0
+	R_AARCH64_P32_ABS32                       R_AARCH64 = 1
+	R_AARCH64_P32_ABS16                       R_AARCH64 = 2
+	R_AARCH64_P32_PREL32                      R_AARCH64 = 3
+	R_AARCH64_P32_PREL16                      R_AARCH64 = 4
+	R_AARCH64_P32_MOVW_UABS_G0                R_AARCH64 = 5
+	R_AARCH64_P32_MOVW_UABS_G0_NC             R_AARCH64 = 6
+	R_AARCH64_P32_MOVW_UABS_G1                R_AARCH64 = 7
+	R_AARCH64_P32_MOVW_SABS_G0                R_AARCH64 = 8
+	R_AARCH64_P32_LD_PREL_LO19                R_AARCH64 = 9
+	R_AARCH64_P32_ADR_PREL_LO21               R_AARCH64 = 10
+	R_AARCH64_P32_ADR_PREL_PG_HI21            R_AARCH64 = 11
+	R_AARCH64_P32_ADD_ABS_LO12_NC             R_AARCH64 = 12
+	R_AARCH64_P32_LDST8_ABS_LO12_NC           R_AARCH64 = 13
+	R_AARCH64_P32_LDST16_ABS_LO12_NC          R_AARCH64 = 14
+	R_AARCH64_P32_LDST32_ABS_LO12_NC          R_AARCH64 = 15
+	R_AARCH64_P32_LDST64_ABS_LO12_NC          R_AARCH64 = 16
+	R_AARCH64_P32_LDST128_ABS_LO12_NC         R_AARCH64 = 17
+	R_AARCH64_P32_TSTBR14                     R_AARCH64 = 18
+	R_AARCH64_P32_CONDBR19                    R_AARCH64 = 19
+	R_AARCH64_P32_JUMP26                      R_AARCH64 = 20
+	R_AARCH64_P32_CALL26                      R_AARCH64 = 21
+	R_AARCH64_P32_GOT_LD_PREL19               R_AARCH64 = 25
+	R_AARCH64_P32_ADR_GOT_PAGE                R_AARCH64 = 26
+	R_AARCH64_P32_LD32_GOT_LO12_NC            R_AARCH64 = 27
+	R_AARCH64_P32_TLSGD_ADR_PAGE21            R_AARCH64 = 81
+	R_AARCH64_P32_TLSGD_ADD_LO12_NC           R_AARCH64 = 82
+	R_AARCH64_P32_TLSIE_ADR_GOTTPREL_PAGE21   R_AARCH64 = 103
+	R_AARCH64_P32_TLSIE_LD32_GOTTPREL_LO12_NC R_AARCH64 = 104
+	R_AARCH64_P32_TLSIE_LD_GOTTPREL_PREL19    R_AARCH64 = 105
+	R_AARCH64_P32_TLSLE_MOVW_TPREL_G1         R_AARCH64 = 106
+	R_AARCH64_P32_TLSLE_MOVW_TPREL_G0         R_AARCH64 = 107
+	R_AARCH64_P32_TLSLE_MOVW_TPREL_G0_NC      R_AARCH64 = 108
+	R_AARCH64_P32_TLSLE_ADD_TPREL_HI12        R_AARCH64 = 109
+	R_AARCH64_P32_TLSLE_ADD_TPREL_LO12        R_AARCH64 = 110
+	R_AARCH64_P32_TLSLE_ADD_TPREL_LO12_NC     R_AARCH64 = 111
+	R_AARCH64_P32_TLSDESC_LD_PREL19           R_AARCH64 = 122
+	R_AARCH64_P32_TLSDESC_ADR_PREL21          R_AARCH64 = 123
+	R_AARCH64_P32_TLSDESC_ADR_PAGE21          R_AARCH64 = 124
+	R_AARCH64_P32_TLSDESC_LD32_LO12_NC        R_AARCH64 = 125
+	R_AARCH64_P32_TLSDESC_ADD_LO12_NC         R_AARCH64 = 126
+	R_AARCH64_P32_TLSDESC_CALL                R_AARCH64 = 127
+	R_AARCH64_P32_COPY                        R_AARCH64 = 180
+	R_AARCH64_P32_GLOB_DAT                    R_AARCH64 = 181
+	R_AARCH64_P32_JUMP_SLOT                   R_AARCH64 = 182
+	R_AARCH64_P32_RELATIVE                    R_AARCH64 = 183
+	R_AARCH64_P32_TLS_DTPMOD                  R_AARCH64 = 184
+	R_AARCH64_P32_TLS_DTPREL                  R_AARCH64 = 185
+	R_AARCH64_P32_TLS_TPREL                   R_AARCH64 = 186
+	R_AARCH64_P32_TLSDESC                     R_AARCH64 = 187
+	R_AARCH64_P32_IRELATIVE                   R_AARCH64 = 188
+	R_AARCH64_NULL                            R_AARCH64 = 256
+	R_AARCH64_ABS64                           R_AARCH64 = 257
+	R_AARCH64_ABS32                           R_AARCH64 = 258
+	R_AARCH64_ABS16                           R_AARCH64 = 259
+	R_AARCH64_PREL64                          R_AARCH64 = 260
+	R_AARCH64_PREL32                          R_AARCH64 = 261
+	R_AARCH64_PREL16                          R_AARCH64 = 262
+	R_AARCH64_MOVW_UABS_G0                    R_AARCH64 = 263
+	R_AARCH64_MOVW_UABS_G0_NC                 R_AARCH64 = 264
+	R_AARCH64_MOVW_UABS_G1                    R_AARCH64 = 265
+	R_AARCH64_MOVW_UABS_G1_NC                 R_AARCH64 = 266
+	R_AARCH64_MOVW_UABS_G2                    R_AARCH64 = 267
+	R_AARCH64_MOVW_UABS_G2_NC                 R_AARCH64 = 268
+	R_AARCH64_MOVW_UABS_G3                    R_AARCH64 = 269
+	R_AARCH64_MOVW_SABS_G0                    R_AARCH64 = 270
+	R_AARCH64_MOVW_SABS_G1                    R_AARCH64 = 271
+	R_AARCH64_MOVW_SABS_G2                    R_AARCH64 = 272
+	R_AARCH64_LD_PREL_LO19                    R_AARCH64 = 273
+	R_AARCH64_ADR_PREL_LO21                   R_AARCH64 = 274
+	R_AARCH64_ADR_PREL_PG_HI21                R_AARCH64 = 275
+	R_AARCH64_ADR_PREL_PG_HI21_NC             R_AARCH64 = 276
+	R_AARCH64_ADD_ABS_LO12_NC                 R_AARCH64 = 277
+	R_AARCH64_LDST8_ABS_LO12_NC               R_AARCH64 = 278
+	R_AARCH64_TSTBR14                         R_AARCH64 = 279
+	R_AARCH64_CONDBR19                        R_AARCH64 = 280
+	R_AARCH64_JUMP26                          R_AARCH64 = 282
+	R_AARCH64_CALL26                          R_AARCH64 = 283
+	R_AARCH64_LDST16_ABS_LO12_NC              R_AARCH64 = 284
+	R_AARCH64_LDST32_ABS_LO12_NC              R_AARCH64 = 285
+	R_AARCH64_LDST64_ABS_LO12_NC              R_AARCH64 = 286
+	R_AARCH64_LDST128_ABS_LO12_NC             R_AARCH64 = 299
+	R_AARCH64_GOT_LD_PREL19                   R_AARCH64 = 309
+	R_AARCH64_LD64_GOTOFF_LO15                R_AARCH64 = 310
+	R_AARCH64_ADR_GOT_PAGE                    R_AARCH64 = 311
+	R_AARCH64_LD64_GOT_LO12_NC                R_AARCH64 = 312
+	R_AARCH64_LD64_GOTPAGE_LO15               R_AARCH64 = 313
+	R_AARCH64_TLSGD_ADR_PREL21                R_AARCH64 = 512
+	R_AARCH64_TLSGD_ADR_PAGE21                R_AARCH64 = 513
+	R_AARCH64_TLSGD_ADD_LO12_NC               R_AARCH64 = 514
+	R_AARCH64_TLSGD_MOVW_G1                   R_AARCH64 = 515
+	R_AARCH64_TLSGD_MOVW_G0_NC                R_AARCH64 = 516
+	R_AARCH64_TLSLD_ADR_PREL21                R_AARCH64 = 517
+	R_AARCH64_TLSLD_ADR_PAGE21                R_AARCH64 = 518
+	R_AARCH64_TLSIE_MOVW_GOTTPREL_G1          R_AARCH64 = 539
+	R_AARCH64_TLSIE_MOVW_GOTTPREL_G0_NC       R_AARCH64 = 540
+	R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21       R_AARCH64 = 541
+	R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC     R_AARCH64 = 542
+	R_AARCH64_TLSIE_LD_GOTTPREL_PREL19        R_AARCH64 = 543
+	R_AARCH64_TLSLE_MOVW_TPREL_G2             R_AARCH64 = 544
+	R_AARCH64_TLSLE_MOVW_TPREL_G1             R_AARCH64 = 545
+	R_AARCH64_TLSLE_MOVW_TPREL_G1_NC          R_AARCH64 = 546
+	R_AARCH64_TLSLE_MOVW_TPREL_G0             R_AARCH64 = 547
+	R_AARCH64_TLSLE_MOVW_TPREL_G0_NC          R_AARCH64 = 548
+	R_AARCH64_TLSLE_ADD_TPREL_HI12            R_AARCH64 = 549
+	R_AARCH64_TLSLE_ADD_TPREL_LO12            R_AARCH64 = 550
+	R_AARCH64_TLSLE_ADD_TPREL_LO12_NC         R_AARCH64 = 551
+	R_AARCH64_TLSDESC_LD_PREL19               R_AARCH64 = 560
+	R_AARCH64_TLSDESC_ADR_PREL21              R_AARCH64 = 561
+	R_AARCH64_TLSDESC_ADR_PAGE21              R_AARCH64 = 562
+	R_AARCH64_TLSDESC_LD64_LO12_NC            R_AARCH64 = 563
+	R_AARCH64_TLSDESC_ADD_LO12_NC             R_AARCH64 = 564
+	R_AARCH64_TLSDESC_OFF_G1                  R_AARCH64 = 565
+	R_AARCH64_TLSDESC_OFF_G0_NC               R_AARCH64 = 566
+	R_AARCH64_TLSDESC_LDR                     R_AARCH64 = 567
+	R_AARCH64_TLSDESC_ADD                     R_AARCH64 = 568
+	R_AARCH64_TLSDESC_CALL                    R_AARCH64 = 569
+	R_AARCH64_TLSLE_LDST128_TPREL_LO12        R_AARCH64 = 570
+	R_AARCH64_TLSLE_LDST128_TPREL_LO12_NC     R_AARCH64 = 571
+	R_AARCH64_TLSLD_LDST128_DTPREL_LO12       R_AARCH64 = 572
+	R_AARCH64_TLSLD_LDST128_DTPREL_LO12_NC    R_AARCH64 = 573
+	R_AARCH64_COPY                            R_AARCH64 = 1024
+	R_AARCH64_GLOB_DAT                        R_AARCH64 = 1025
+	R_AARCH64_JUMP_SLOT                       R_AARCH64 = 1026
+	R_AARCH64_RELATIVE                        R_AARCH64 = 1027
+	R_AARCH64_TLS_DTPMOD64                    R_AARCH64 = 1028
+	R_AARCH64_TLS_DTPREL64                    R_AARCH64 = 1029
+	R_AARCH64_TLS_TPREL64                     R_AARCH64 = 1030
+	R_AARCH64_TLSDESC                         R_AARCH64 = 1031
+	R_AARCH64_IRELATIVE                       R_AARCH64 = 1032
+)
+
+var raarch64Strings = []intName{
+	{0, "R_AARCH64_NONE"},
+	{1, "R_AARCH64_P32_ABS32"},
+	{2, "R_AARCH64_P32_ABS16"},
+	{3, "R_AARCH64_P32_PREL32"},
+	{4, "R_AARCH64_P32_PREL16"},
+	{5, "R_AARCH64_P32_MOVW_UABS_G0"},
+	{6, "R_AARCH64_P32_MOVW_UABS_G0_NC"},
+	{7, "R_AARCH64_P32_MOVW_UABS_G1"},
+	{8, "R_AARCH64_P32_MOVW_SABS_G0"},
+	{9, "R_AARCH64_P32_LD_PREL_LO19"},
+	{10, "R_AARCH64_P32_ADR_PREL_LO21"},
+	{11, "R_AARCH64_P32_ADR_PREL_PG_HI21"},
+	{12, "R_AARCH64_P32_ADD_ABS_LO12_NC"},
+	{13, "R_AARCH64_P32_LDST8_ABS_LO12_NC"},
+	{14, "R_AARCH64_P32_LDST16_ABS_LO12_NC"},
+	{15, "R_AARCH64_P32_LDST32_ABS_LO12_NC"},
+	{16, "R_AARCH64_P32_LDST64_ABS_LO12_NC"},
+	{17, "R_AARCH64_P32_LDST128_ABS_LO12_NC"},
+	{18, "R_AARCH64_P32_TSTBR14"},
+	{19, "R_AARCH64_P32_CONDBR19"},
+	{20, "R_AARCH64_P32_JUMP26"},
+	{21, "R_AARCH64_P32_CALL26"},
+	{25, "R_AARCH64_P32_GOT_LD_PREL19"},
+	{26, "R_AARCH64_P32_ADR_GOT_PAGE"},
+	{27, "R_AARCH64_P32_LD32_GOT_LO12_NC"},
+	{81, "R_AARCH64_P32_TLSGD_ADR_PAGE21"},
+	{82, "R_AARCH64_P32_TLSGD_ADD_LO12_NC"},
+	{103, "R_AARCH64_P32_TLSIE_ADR_GOTTPREL_PAGE21"},
+	{104, "R_AARCH64_P32_TLSIE_LD32_GOTTPREL_LO12_NC"},
+	{105, "R_AARCH64_P32_TLSIE_LD_GOTTPREL_PREL19"},
+	{106, "R_AARCH64_P32_TLSLE_MOVW_TPREL_G1"},
+	{107, "R_AARCH64_P32_TLSLE_MOVW_TPREL_G0"},
+	{108, "R_AARCH64_P32_TLSLE_MOVW_TPREL_G0_NC"},
+	{109, "R_AARCH64_P32_TLSLE_ADD_TPREL_HI12"},
+	{110, "R_AARCH64_P32_TLSLE_ADD_TPREL_LO12"},
+	{111, "R_AARCH64_P32_TLSLE_ADD_TPREL_LO12_NC"},
+	{122, "R_AARCH64_P32_TLSDESC_LD_PREL19"},
+	{123, "R_AARCH64_P32_TLSDESC_ADR_PREL21"},
+	{124, "R_AARCH64_P32_TLSDESC_ADR_PAGE21"},
+	{125, "R_AARCH64_P32_TLSDESC_LD32_LO12_NC"},
+	{126, "R_AARCH64_P32_TLSDESC_ADD_LO12_NC"},
+	{127, "R_AARCH64_P32_TLSDESC_CALL"},
+	{180, "R_AARCH64_P32_COPY"},
+	{181, "R_AARCH64_P32_GLOB_DAT"},
+	{182, "R_AARCH64_P32_JUMP_SLOT"},
+	{183, "R_AARCH64_P32_RELATIVE"},
+	{184, "R_AARCH64_P32_TLS_DTPMOD"},
+	{185, "R_AARCH64_P32_TLS_DTPREL"},
+	{186, "R_AARCH64_P32_TLS_TPREL"},
+	{187, "R_AARCH64_P32_TLSDESC"},
+	{188, "R_AARCH64_P32_IRELATIVE"},
+	{256, "R_AARCH64_NULL"},
+	{257, "R_AARCH64_ABS64"},
+	{258, "R_AARCH64_ABS32"},
+	{259, "R_AARCH64_ABS16"},
+	{260, "R_AARCH64_PREL64"},
+	{261, "R_AARCH64_PREL32"},
+	{262, "R_AARCH64_PREL16"},
+	{263, "R_AARCH64_MOVW_UABS_G0"},
+	{264, "R_AARCH64_MOVW_UABS_G0_NC"},
+	{265, "R_AARCH64_MOVW_UABS_G1"},
+	{266, "R_AARCH64_MOVW_UABS_G1_NC"},
+	{267, "R_AARCH64_MOVW_UABS_G2"},
+	{268, "R_AARCH64_MOVW_UABS_G2_NC"},
+	{269, "R_AARCH64_MOVW_UABS_G3"},
+	{270, "R_AARCH64_MOVW_SABS_G0"},
+	{271, "R_AARCH64_MOVW_SABS_G1"},
+	{272, "R_AARCH64_MOVW_SABS_G2"},
+	{273, "R_AARCH64_LD_PREL_LO19"},
+	{274, "R_AARCH64_ADR_PREL_LO21"},
+	{275, "R_AARCH64_ADR_PREL_PG_HI21"},
+	{276, "R_AARCH64_ADR_PREL_PG_HI21_NC"},
+	{277, "R_AARCH64_ADD_ABS_LO12_NC"},
+	{278, "R_AARCH64_LDST8_ABS_LO12_NC"},
+	{279, "R_AARCH64_TSTBR14"},
+	{280, "R_AARCH64_CONDBR19"},
+	{282, "R_AARCH64_JUMP26"},
+	{283, "R_AARCH64_CALL26"},
+	{284, "R_AARCH64_LDST16_ABS_LO12_NC"},
+	{285, "R_AARCH64_LDST32_ABS_LO12_NC"},
+	{286, "R_AARCH64_LDST64_ABS_LO12_NC"},
+	{299, "R_AARCH64_LDST128_ABS_LO12_NC"},
+	{309, "R_AARCH64_GOT_LD_PREL19"},
+	{310, "R_AARCH64_LD64_GOTOFF_LO15"},
+	{311, "R_AARCH64_ADR_GOT_PAGE"},
+	{312, "R_AARCH64_LD64_GOT_LO12_NC"},
+	{313, "R_AARCH64_LD64_GOTPAGE_LO15"},
+	{512, "R_AARCH64_TLSGD_ADR_PREL21"},
+	{513, "R_AARCH64_TLSGD_ADR_PAGE21"},
+	{514, "R_AARCH64_TLSGD_ADD_LO12_NC"},
+	{515, "R_AARCH64_TLSGD_MOVW_G1"},
+	{516, "R_AARCH64_TLSGD_MOVW_G0_NC"},
+	{517, "R_AARCH64_TLSLD_ADR_PREL21"},
+	{518, "R_AARCH64_TLSLD_ADR_PAGE21"},
+	{539, "R_AARCH64_TLSIE_MOVW_GOTTPREL_G1"},
+	{540, "R_AARCH64_TLSIE_MOVW_GOTTPREL_G0_NC"},
+	{541, "R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21"},
+	{542, "R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC"},
+	{543, "R_AARCH64_TLSIE_LD_GOTTPREL_PREL19"},
+	{544, "R_AARCH64_TLSLE_MOVW_TPREL_G2"},
+	{545, "R_AARCH64_TLSLE_MOVW_TPREL_G1"},
+	{546, "R_AARCH64_TLSLE_MOVW_TPREL_G1_NC"},
+	{547, "R_AARCH64_TLSLE_MOVW_TPREL_G0"},
+	{548, "R_AARCH64_TLSLE_MOVW_TPREL_G0_NC"},
+	{549, "R_AARCH64_TLSLE_ADD_TPREL_HI12"},
+	{550, "R_AARCH64_TLSLE_ADD_TPREL_LO12"},
+	{551, "R_AARCH64_TLSLE_ADD_TPREL_LO12_NC"},
+	{560, "R_AARCH64_TLSDESC_LD_PREL19"},
+	{561, "R_AARCH64_TLSDESC_ADR_PREL21"},
+	{562, "R_AARCH64_TLSDESC_ADR_PAGE21"},
+	{563, "R_AARCH64_TLSDESC_LD64_LO12_NC"},
+	{564, "R_AARCH64_TLSDESC_ADD_LO12_NC"},
+	{565, "R_AARCH64_TLSDESC_OFF_G1"},
+	{566, "R_AARCH64_TLSDESC_OFF_G0_NC"},
+	{567, "R_AARCH64_TLSDESC_LDR"},
+	{568, "R_AARCH64_TLSDESC_ADD"},
+	{569, "R_AARCH64_TLSDESC_CALL"},
+	{570, "R_AARCH64_TLSLE_LDST128_TPREL_LO12"},
+	{571, "R_AARCH64_TLSLE_LDST128_TPREL_LO12_NC"},
+	{572, "R_AARCH64_TLSLD_LDST128_DTPREL_LO12"},
+	{573, "R_AARCH64_TLSLD_LDST128_DTPREL_LO12_NC"},
+	{1024, "R_AARCH64_COPY"},
+	{1025, "R_AARCH64_GLOB_DAT"},
+	{1026, "R_AARCH64_JUMP_SLOT"},
+	{1027, "R_AARCH64_RELATIVE"},
+	{1028, "R_AARCH64_TLS_DTPMOD64"},
+	{1029, "R_AARCH64_TLS_DTPREL64"},
+	{1030, "R_AARCH64_TLS_TPREL64"},
+	{1031, "R_AARCH64_TLSDESC"},
+	{1032, "R_AARCH64_IRELATIVE"},
+}
+
+func (i R_AARCH64) String() string   { return stringName(uint32(i), raarch64Strings, false) }
+func (i R_AARCH64) GoString() string { return stringName(uint32(i), raarch64Strings, true) }
+
+// Relocation types for Alpha.
+type R_ALPHA int
+
+const (
+	R_ALPHA_NONE           R_ALPHA = 0  /* No reloc */
+	R_ALPHA_REFLONG        R_ALPHA = 1  /* Direct 32 bit */
+	R_ALPHA_REFQUAD        R_ALPHA = 2  /* Direct 64 bit */
+	R_ALPHA_GPREL32        R_ALPHA = 3  /* GP relative 32 bit */
+	R_ALPHA_LITERAL        R_ALPHA = 4  /* GP relative 16 bit w/optimization */
+	R_ALPHA_LITUSE         R_ALPHA = 5  /* Optimization hint for LITERAL */
+	R_ALPHA_GPDISP         R_ALPHA = 6  /* Add displacement to GP */
+	R_ALPHA_BRADDR         R_ALPHA = 7  /* PC+4 relative 23 bit shifted */
+	R_ALPHA_HINT           R_ALPHA = 8  /* PC+4 relative 16 bit shifted */
+	R_ALPHA_SREL16         R_ALPHA = 9  /* PC relative 16 bit */
+	R_ALPHA_SREL32         R_ALPHA = 10 /* PC relative 32 bit */
+	R_ALPHA_SREL64         R_ALPHA = 11 /* PC relative 64 bit */
+	R_ALPHA_OP_PUSH        R_ALPHA = 12 /* OP stack push */
+	R_ALPHA_OP_STORE       R_ALPHA = 13 /* OP stack pop and store */
+	R_ALPHA_OP_PSUB        R_ALPHA = 14 /* OP stack subtract */
+	R_ALPHA_OP_PRSHIFT     R_ALPHA = 15 /* OP stack right shift */
+	R_ALPHA_GPVALUE        R_ALPHA = 16
+	R_ALPHA_GPRELHIGH      R_ALPHA = 17
+	R_ALPHA_GPRELLOW       R_ALPHA = 18
+	R_ALPHA_IMMED_GP_16    R_ALPHA = 19
+	R_ALPHA_IMMED_GP_HI32  R_ALPHA = 20
+	R_ALPHA_IMMED_SCN_HI32 R_ALPHA = 21
+	R_ALPHA_IMMED_BR_HI32  R_ALPHA = 22
+	R_ALPHA_IMMED_LO32     R_ALPHA = 23
+	R_ALPHA_COPY           R_ALPHA = 24 /* Copy symbol at runtime */
+	R_ALPHA_GLOB_DAT       R_ALPHA = 25 /* Create GOT entry */
+	R_ALPHA_JMP_SLOT       R_ALPHA = 26 /* Create PLT entry */
+	R_ALPHA_RELATIVE       R_ALPHA = 27 /* Adjust by program base */
+)
+
+var ralphaStrings = []intName{
+	{0, "R_ALPHA_NONE"},
+	{1, "R_ALPHA_REFLONG"},
+	{2, "R_ALPHA_REFQUAD"},
+	{3, "R_ALPHA_GPREL32"},
+	{4, "R_ALPHA_LITERAL"},
+	{5, "R_ALPHA_LITUSE"},
+	{6, "R_ALPHA_GPDISP"},
+	{7, "R_ALPHA_BRADDR"},
+	{8, "R_ALPHA_HINT"},
+	{9, "R_ALPHA_SREL16"},
+	{10, "R_ALPHA_SREL32"},
+	{11, "R_ALPHA_SREL64"},
+	{12, "R_ALPHA_OP_PUSH"},
+	{13, "R_ALPHA_OP_STORE"},
+	{14, "R_ALPHA_OP_PSUB"},
+	{15, "R_ALPHA_OP_PRSHIFT"},
+	{16, "R_ALPHA_GPVALUE"},
+	{17, "R_ALPHA_GPRELHIGH"},
+	{18, "R_ALPHA_GPRELLOW"},
+	{19, "R_ALPHA_IMMED_GP_16"},
+	{20, "R_ALPHA_IMMED_GP_HI32"},
+	{21, "R_ALPHA_IMMED_SCN_HI32"},
+	{22, "R_ALPHA_IMMED_BR_HI32"},
+	{23, "R_ALPHA_IMMED_LO32"},
+	{24, "R_ALPHA_COPY"},
+	{25, "R_ALPHA_GLOB_DAT"},
+	{26, "R_ALPHA_JMP_SLOT"},
+	{27, "R_ALPHA_RELATIVE"},
+}
+
+func (i R_ALPHA) String() string   { return stringName(uint32(i), ralphaStrings, false) }
+func (i R_ALPHA) GoString() string { return stringName(uint32(i), ralphaStrings, true) }
+
+// Relocation types for ARM.
+type R_ARM int
+
+const (
+	R_ARM_NONE               R_ARM = 0 /* No relocation. */
+	R_ARM_PC24               R_ARM = 1
+	R_ARM_ABS32              R_ARM = 2
+	R_ARM_REL32              R_ARM = 3
+	R_ARM_PC13               R_ARM = 4
+	R_ARM_ABS16              R_ARM = 5
+	R_ARM_ABS12              R_ARM = 6
+	R_ARM_THM_ABS5           R_ARM = 7
+	R_ARM_ABS8               R_ARM = 8
+	R_ARM_SBREL32            R_ARM = 9
+	R_ARM_THM_PC22           R_ARM = 10
+	R_ARM_THM_PC8            R_ARM = 11
+	R_ARM_AMP_VCALL9         R_ARM = 12
+	R_ARM_SWI24              R_ARM = 13
+	R_ARM_THM_SWI8           R_ARM = 14
+	R_ARM_XPC25              R_ARM = 15
+	R_ARM_THM_XPC22          R_ARM = 16
+	R_ARM_TLS_DTPMOD32       R_ARM = 17
+	R_ARM_TLS_DTPOFF32       R_ARM = 18
+	R_ARM_TLS_TPOFF32        R_ARM = 19
+	R_ARM_COPY               R_ARM = 20 /* Copy data from shared object. */
+	R_ARM_GLOB_DAT           R_ARM = 21 /* Set GOT entry to data address. */
+	R_ARM_JUMP_SLOT          R_ARM = 22 /* Set GOT entry to code address. */
+	R_ARM_RELATIVE           R_ARM = 23 /* Add load address of shared object. */
+	R_ARM_GOTOFF             R_ARM = 24 /* Add GOT-relative symbol address. */
+	R_ARM_GOTPC              R_ARM = 25 /* Add PC-relative GOT table address. */
+	R_ARM_GOT32              R_ARM = 26 /* Add PC-relative GOT offset. */
+	R_ARM_PLT32              R_ARM = 27 /* Add PC-relative PLT offset. */
+	R_ARM_CALL               R_ARM = 28
+	R_ARM_JUMP24             R_ARM = 29
+	R_ARM_THM_JUMP24         R_ARM = 30
+	R_ARM_BASE_ABS           R_ARM = 31
+	R_ARM_ALU_PCREL_7_0      R_ARM = 32
+	R_ARM_ALU_PCREL_15_8     R_ARM = 33
+	R_ARM_ALU_PCREL_23_15    R_ARM = 34
+	R_ARM_LDR_SBREL_11_10_NC R_ARM = 35
+	R_ARM_ALU_SBREL_19_12_NC R_ARM = 36
+	R_ARM_ALU_SBREL_27_20_CK R_ARM = 37
+	R_ARM_TARGET1            R_ARM = 38
+	R_ARM_SBREL31            R_ARM = 39
+	R_ARM_V4BX               R_ARM = 40
+	R_ARM_TARGET2            R_ARM = 41
+	R_ARM_PREL31             R_ARM = 42
+	R_ARM_MOVW_ABS_NC        R_ARM = 43
+	R_ARM_MOVT_ABS           R_ARM = 44
+	R_ARM_MOVW_PREL_NC       R_ARM = 45
+	R_ARM_MOVT_PREL          R_ARM = 46
+	R_ARM_THM_MOVW_ABS_NC    R_ARM = 47
+	R_ARM_THM_MOVT_ABS       R_ARM = 48
+	R_ARM_THM_MOVW_PREL_NC   R_ARM = 49
+	R_ARM_THM_MOVT_PREL      R_ARM = 50
+	R_ARM_THM_JUMP19         R_ARM = 51
+	R_ARM_THM_JUMP6          R_ARM = 52
+	R_ARM_THM_ALU_PREL_11_0  R_ARM = 53
+	R_ARM_THM_PC12           R_ARM = 54
+	R_ARM_ABS32_NOI          R_ARM = 55
+	R_ARM_REL32_NOI          R_ARM = 56
+	R_ARM_ALU_PC_G0_NC       R_ARM = 57
+	R_ARM_ALU_PC_G0          R_ARM = 58
+	R_ARM_ALU_PC_G1_NC       R_ARM = 59
+	R_ARM_ALU_PC_G1          R_ARM = 60
+	R_ARM_ALU_PC_G2          R_ARM = 61
+	R_ARM_LDR_PC_G1          R_ARM = 62
+	R_ARM_LDR_PC_G2          R_ARM = 63
+	R_ARM_LDRS_PC_G0         R_ARM = 64
+	R_ARM_LDRS_PC_G1         R_ARM = 65
+	R_ARM_LDRS_PC_G2         R_ARM = 66
+	R_ARM_LDC_PC_G0          R_ARM = 67
+	R_ARM_LDC_PC_G1          R_ARM = 68
+	R_ARM_LDC_PC_G2          R_ARM = 69
+	R_ARM_ALU_SB_G0_NC       R_ARM = 70
+	R_ARM_ALU_SB_G0          R_ARM = 71
+	R_ARM_ALU_SB_G1_NC       R_ARM = 72
+	R_ARM_ALU_SB_G1          R_ARM = 73
+	R_ARM_ALU_SB_G2          R_ARM = 74
+	R_ARM_LDR_SB_G0          R_ARM = 75
+	R_ARM_LDR_SB_G1          R_ARM = 76
+	R_ARM_LDR_SB_G2          R_ARM = 77
+	R_ARM_LDRS_SB_G0         R_ARM = 78
+	R_ARM_LDRS_SB_G1         R_ARM = 79
+	R_ARM_LDRS_SB_G2         R_ARM = 80
+	R_ARM_LDC_SB_G0          R_ARM = 81
+	R_ARM_LDC_SB_G1          R_ARM = 82
+	R_ARM_LDC_SB_G2          R_ARM = 83
+	R_ARM_MOVW_BREL_NC       R_ARM = 84
+	R_ARM_MOVT_BREL          R_ARM = 85
+	R_ARM_MOVW_BREL          R_ARM = 86
+	R_ARM_THM_MOVW_BREL_NC   R_ARM = 87
+	R_ARM_THM_MOVT_BREL      R_ARM = 88
+	R_ARM_THM_MOVW_BREL      R_ARM = 89
+	R_ARM_TLS_GOTDESC        R_ARM = 90
+	R_ARM_TLS_CALL           R_ARM = 91
+	R_ARM_TLS_DESCSEQ        R_ARM = 92
+	R_ARM_THM_TLS_CALL       R_ARM = 93
+	R_ARM_PLT32_ABS          R_ARM = 94
+	R_ARM_GOT_ABS            R_ARM = 95
+	R_ARM_GOT_PREL           R_ARM = 96
+	R_ARM_GOT_BREL12         R_ARM = 97
+	R_ARM_GOTOFF12           R_ARM = 98
+	R_ARM_GOTRELAX           R_ARM = 99
+	R_ARM_GNU_VTENTRY        R_ARM = 100
+	R_ARM_GNU_VTINHERIT      R_ARM = 101
+	R_ARM_THM_JUMP11         R_ARM = 102
+	R_ARM_THM_JUMP8          R_ARM = 103
+	R_ARM_TLS_GD32           R_ARM = 104
+	R_ARM_TLS_LDM32          R_ARM = 105
+	R_ARM_TLS_LDO32          R_ARM = 106
+	R_ARM_TLS_IE32           R_ARM = 107
+	R_ARM_TLS_LE32           R_ARM = 108
+	R_ARM_TLS_LDO12          R_ARM = 109
+	R_ARM_TLS_LE12           R_ARM = 110
+	R_ARM_TLS_IE12GP         R_ARM = 111
+	R_ARM_PRIVATE_0          R_ARM = 112
+	R_ARM_PRIVATE_1          R_ARM = 113
+	R_ARM_PRIVATE_2          R_ARM = 114
+	R_ARM_PRIVATE_3          R_ARM = 115
+	R_ARM_PRIVATE_4          R_ARM = 116
+	R_ARM_PRIVATE_5          R_ARM = 117
+	R_ARM_PRIVATE_6          R_ARM = 118
+	R_ARM_PRIVATE_7          R_ARM = 119
+	R_ARM_PRIVATE_8          R_ARM = 120
+	R_ARM_PRIVATE_9          R_ARM = 121
+	R_ARM_PRIVATE_10         R_ARM = 122
+	R_ARM_PRIVATE_11         R_ARM = 123
+	R_ARM_PRIVATE_12         R_ARM = 124
+	R_ARM_PRIVATE_13         R_ARM = 125
+	R_ARM_PRIVATE_14         R_ARM = 126
+	R_ARM_PRIVATE_15         R_ARM = 127
+	R_ARM_ME_TOO             R_ARM = 128
+	R_ARM_THM_TLS_DESCSEQ16  R_ARM = 129
+	R_ARM_THM_TLS_DESCSEQ32  R_ARM = 130
+	R_ARM_THM_GOT_BREL12     R_ARM = 131
+	R_ARM_THM_ALU_ABS_G0_NC  R_ARM = 132
+	R_ARM_THM_ALU_ABS_G1_NC  R_ARM = 133
+	R_ARM_THM_ALU_ABS_G2_NC  R_ARM = 134
+	R_ARM_THM_ALU_ABS_G3     R_ARM = 135
+	R_ARM_IRELATIVE          R_ARM = 160
+	R_ARM_RXPC25             R_ARM = 249
+	R_ARM_RSBREL32           R_ARM = 250
+	R_ARM_THM_RPC22          R_ARM = 251
+	R_ARM_RREL32             R_ARM = 252
+	R_ARM_RABS32             R_ARM = 253
+	R_ARM_RPC24              R_ARM = 254
+	R_ARM_RBASE              R_ARM = 255
+)
+
+var rarmStrings = []intName{
+	{0, "R_ARM_NONE"},
+	{1, "R_ARM_PC24"},
+	{2, "R_ARM_ABS32"},
+	{3, "R_ARM_REL32"},
+	{4, "R_ARM_PC13"},
+	{5, "R_ARM_ABS16"},
+	{6, "R_ARM_ABS12"},
+	{7, "R_ARM_THM_ABS5"},
+	{8, "R_ARM_ABS8"},
+	{9, "R_ARM_SBREL32"},
+	{10, "R_ARM_THM_PC22"},
+	{11, "R_ARM_THM_PC8"},
+	{12, "R_ARM_AMP_VCALL9"},
+	{13, "R_ARM_SWI24"},
+	{14, "R_ARM_THM_SWI8"},
+	{15, "R_ARM_XPC25"},
+	{16, "R_ARM_THM_XPC22"},
+	{17, "R_ARM_TLS_DTPMOD32"},
+	{18, "R_ARM_TLS_DTPOFF32"},
+	{19, "R_ARM_TLS_TPOFF32"},
+	{20, "R_ARM_COPY"},
+	{21, "R_ARM_GLOB_DAT"},
+	{22, "R_ARM_JUMP_SLOT"},
+	{23, "R_ARM_RELATIVE"},
+	{24, "R_ARM_GOTOFF"},
+	{25, "R_ARM_GOTPC"},
+	{26, "R_ARM_GOT32"},
+	{27, "R_ARM_PLT32"},
+	{28, "R_ARM_CALL"},
+	{29, "R_ARM_JUMP24"},
+	{30, "R_ARM_THM_JUMP24"},
+	{31, "R_ARM_BASE_ABS"},
+	{32, "R_ARM_ALU_PCREL_7_0"},
+	{33, "R_ARM_ALU_PCREL_15_8"},
+	{34, "R_ARM_ALU_PCREL_23_15"},
+	{35, "R_ARM_LDR_SBREL_11_10_NC"},
+	{36, "R_ARM_ALU_SBREL_19_12_NC"},
+	{37, "R_ARM_ALU_SBREL_27_20_CK"},
+	{38, "R_ARM_TARGET1"},
+	{39, "R_ARM_SBREL31"},
+	{40, "R_ARM_V4BX"},
+	{41, "R_ARM_TARGET2"},
+	{42, "R_ARM_PREL31"},
+	{43, "R_ARM_MOVW_ABS_NC"},
+	{44, "R_ARM_MOVT_ABS"},
+	{45, "R_ARM_MOVW_PREL_NC"},
+	{46, "R_ARM_MOVT_PREL"},
+	{47, "R_ARM_THM_MOVW_ABS_NC"},
+	{48, "R_ARM_THM_MOVT_ABS"},
+	{49, "R_ARM_THM_MOVW_PREL_NC"},
+	{50, "R_ARM_THM_MOVT_PREL"},
+	{51, "R_ARM_THM_JUMP19"},
+	{52, "R_ARM_THM_JUMP6"},
+	{53, "R_ARM_THM_ALU_PREL_11_0"},
+	{54, "R_ARM_THM_PC12"},
+	{55, "R_ARM_ABS32_NOI"},
+	{56, "R_ARM_REL32_NOI"},
+	{57, "R_ARM_ALU_PC_G0_NC"},
+	{58, "R_ARM_ALU_PC_G0"},
+	{59, "R_ARM_ALU_PC_G1_NC"},
+	{60, "R_ARM_ALU_PC_G1"},
+	{61, "R_ARM_ALU_PC_G2"},
+	{62, "R_ARM_LDR_PC_G1"},
+	{63, "R_ARM_LDR_PC_G2"},
+	{64, "R_ARM_LDRS_PC_G0"},
+	{65, "R_ARM_LDRS_PC_G1"},
+	{66, "R_ARM_LDRS_PC_G2"},
+	{67, "R_ARM_LDC_PC_G0"},
+	{68, "R_ARM_LDC_PC_G1"},
+	{69, "R_ARM_LDC_PC_G2"},
+	{70, "R_ARM_ALU_SB_G0_NC"},
+	{71, "R_ARM_ALU_SB_G0"},
+	{72, "R_ARM_ALU_SB_G1_NC"},
+	{73, "R_ARM_ALU_SB_G1"},
+	{74, "R_ARM_ALU_SB_G2"},
+	{75, "R_ARM_LDR_SB_G0"},
+	{76, "R_ARM_LDR_SB_G1"},
+	{77, "R_ARM_LDR_SB_G2"},
+	{78, "R_ARM_LDRS_SB_G0"},
+	{79, "R_ARM_LDRS_SB_G1"},
+	{80, "R_ARM_LDRS_SB_G2"},
+	{81, "R_ARM_LDC_SB_G0"},
+	{82, "R_ARM_LDC_SB_G1"},
+	{83, "R_ARM_LDC_SB_G2"},
+	{84, "R_ARM_MOVW_BREL_NC"},
+	{85, "R_ARM_MOVT_BREL"},
+	{86, "R_ARM_MOVW_BREL"},
+	{87, "R_ARM_THM_MOVW_BREL_NC"},
+	{88, "R_ARM_THM_MOVT_BREL"},
+	{89, "R_ARM_THM_MOVW_BREL"},
+	{90, "R_ARM_TLS_GOTDESC"},
+	{91, "R_ARM_TLS_CALL"},
+	{92, "R_ARM_TLS_DESCSEQ"},
+	{93, "R_ARM_THM_TLS_CALL"},
+	{94, "R_ARM_PLT32_ABS"},
+	{95, "R_ARM_GOT_ABS"},
+	{96, "R_ARM_GOT_PREL"},
+	{97, "R_ARM_GOT_BREL12"},
+	{98, "R_ARM_GOTOFF12"},
+	{99, "R_ARM_GOTRELAX"},
+	{100, "R_ARM_GNU_VTENTRY"},
+	{101, "R_ARM_GNU_VTINHERIT"},
+	{102, "R_ARM_THM_JUMP11"},
+	{103, "R_ARM_THM_JUMP8"},
+	{104, "R_ARM_TLS_GD32"},
+	{105, "R_ARM_TLS_LDM32"},
+	{106, "R_ARM_TLS_LDO32"},
+	{107, "R_ARM_TLS_IE32"},
+	{108, "R_ARM_TLS_LE32"},
+	{109, "R_ARM_TLS_LDO12"},
+	{110, "R_ARM_TLS_LE12"},
+	{111, "R_ARM_TLS_IE12GP"},
+	{112, "R_ARM_PRIVATE_0"},
+	{113, "R_ARM_PRIVATE_1"},
+	{114, "R_ARM_PRIVATE_2"},
+	{115, "R_ARM_PRIVATE_3"},
+	{116, "R_ARM_PRIVATE_4"},
+	{117, "R_ARM_PRIVATE_5"},
+	{118, "R_ARM_PRIVATE_6"},
+	{119, "R_ARM_PRIVATE_7"},
+	{120, "R_ARM_PRIVATE_8"},
+	{121, "R_ARM_PRIVATE_9"},
+	{122, "R_ARM_PRIVATE_10"},
+	{123, "R_ARM_PRIVATE_11"},
+	{124, "R_ARM_PRIVATE_12"},
+	{125, "R_ARM_PRIVATE_13"},
+	{126, "R_ARM_PRIVATE_14"},
+	{127, "R_ARM_PRIVATE_15"},
+	{128, "R_ARM_ME_TOO"},
+	{129, "R_ARM_THM_TLS_DESCSEQ16"},
+	{130, "R_ARM_THM_TLS_DESCSEQ32"},
+	{131, "R_ARM_THM_GOT_BREL12"},
+	{132, "R_ARM_THM_ALU_ABS_G0_NC"},
+	{133, "R_ARM_THM_ALU_ABS_G1_NC"},
+	{134, "R_ARM_THM_ALU_ABS_G2_NC"},
+	{135, "R_ARM_THM_ALU_ABS_G3"},
+	{160, "R_ARM_IRELATIVE"},
+	{249, "R_ARM_RXPC25"},
+	{250, "R_ARM_RSBREL32"},
+	{251, "R_ARM_THM_RPC22"},
+	{252, "R_ARM_RREL32"},
+	{253, "R_ARM_RABS32"},
+	{254, "R_ARM_RPC24"},
+	{255, "R_ARM_RBASE"},
+}
+
+func (i R_ARM) String() string   { return stringName(uint32(i), rarmStrings, false) }
+func (i R_ARM) GoString() string { return stringName(uint32(i), rarmStrings, true) }
+
+// Relocation types for 386.
+type R_386 int
+
+const (
+	R_386_NONE          R_386 = 0  /* No relocation. */
+	R_386_32            R_386 = 1  /* Add symbol value. */
+	R_386_PC32          R_386 = 2  /* Add PC-relative symbol value. */
+	R_386_GOT32         R_386 = 3  /* Add PC-relative GOT offset. */
+	R_386_PLT32         R_386 = 4  /* Add PC-relative PLT offset. */
+	R_386_COPY          R_386 = 5  /* Copy data from shared object. */
+	R_386_GLOB_DAT      R_386 = 6  /* Set GOT entry to data address. */
+	R_386_JMP_SLOT      R_386 = 7  /* Set GOT entry to code address. */
+	R_386_RELATIVE      R_386 = 8  /* Add load address of shared object. */
+	R_386_GOTOFF        R_386 = 9  /* Add GOT-relative symbol address. */
+	R_386_GOTPC         R_386 = 10 /* Add PC-relative GOT table address. */
+	R_386_32PLT         R_386 = 11
+	R_386_TLS_TPOFF     R_386 = 14 /* Negative offset in static TLS block */
+	R_386_TLS_IE        R_386 = 15 /* Absolute address of GOT for -ve static TLS */
+	R_386_TLS_GOTIE     R_386 = 16 /* GOT entry for negative static TLS block */
+	R_386_TLS_LE        R_386 = 17 /* Negative offset relative to static TLS */
+	R_386_TLS_GD        R_386 = 18 /* 32 bit offset to GOT (index,off) pair */
+	R_386_TLS_LDM       R_386 = 19 /* 32 bit offset to GOT (index,zero) pair */
+	R_386_16            R_386 = 20
+	R_386_PC16          R_386 = 21
+	R_386_8             R_386 = 22
+	R_386_PC8           R_386 = 23
+	R_386_TLS_GD_32     R_386 = 24 /* 32 bit offset to GOT (index,off) pair */
+	R_386_TLS_GD_PUSH   R_386 = 25 /* pushl instruction for Sun ABI GD sequence */
+	R_386_TLS_GD_CALL   R_386 = 26 /* call instruction for Sun ABI GD sequence */
+	R_386_TLS_GD_POP    R_386 = 27 /* popl instruction for Sun ABI GD sequence */
+	R_386_TLS_LDM_32    R_386 = 28 /* 32 bit offset to GOT (index,zero) pair */
+	R_386_TLS_LDM_PUSH  R_386 = 29 /* pushl instruction for Sun ABI LD sequence */
+	R_386_TLS_LDM_CALL  R_386 = 30 /* call instruction for Sun ABI LD sequence */
+	R_386_TLS_LDM_POP   R_386 = 31 /* popl instruction for Sun ABI LD sequence */
+	R_386_TLS_LDO_32    R_386 = 32 /* 32 bit offset from start of TLS block */
+	R_386_TLS_IE_32     R_386 = 33 /* 32 bit offset to GOT static TLS offset entry */
+	R_386_TLS_LE_32     R_386 = 34 /* 32 bit offset within static TLS block */
+	R_386_TLS_DTPMOD32  R_386 = 35 /* GOT entry containing TLS index */
+	R_386_TLS_DTPOFF32  R_386 = 36 /* GOT entry containing TLS offset */
+	R_386_TLS_TPOFF32   R_386 = 37 /* GOT entry of -ve static TLS offset */
+	R_386_SIZE32        R_386 = 38
+	R_386_TLS_GOTDESC   R_386 = 39
+	R_386_TLS_DESC_CALL R_386 = 40
+	R_386_TLS_DESC      R_386 = 41
+	R_386_IRELATIVE     R_386 = 42
+	R_386_GOT32X        R_386 = 43
+)
+
+var r386Strings = []intName{
+	{0, "R_386_NONE"},
+	{1, "R_386_32"},
+	{2, "R_386_PC32"},
+	{3, "R_386_GOT32"},
+	{4, "R_386_PLT32"},
+	{5, "R_386_COPY"},
+	{6, "R_386_GLOB_DAT"},
+	{7, "R_386_JMP_SLOT"},
+	{8, "R_386_RELATIVE"},
+	{9, "R_386_GOTOFF"},
+	{10, "R_386_GOTPC"},
+	{11, "R_386_32PLT"},
+	{14, "R_386_TLS_TPOFF"},
+	{15, "R_386_TLS_IE"},
+	{16, "R_386_TLS_GOTIE"},
+	{17, "R_386_TLS_LE"},
+	{18, "R_386_TLS_GD"},
+	{19, "R_386_TLS_LDM"},
+	{20, "R_386_16"},
+	{21, "R_386_PC16"},
+	{22, "R_386_8"},
+	{23, "R_386_PC8"},
+	{24, "R_386_TLS_GD_32"},
+	{25, "R_386_TLS_GD_PUSH"},
+	{26, "R_386_TLS_GD_CALL"},
+	{27, "R_386_TLS_GD_POP"},
+	{28, "R_386_TLS_LDM_32"},
+	{29, "R_386_TLS_LDM_PUSH"},
+	{30, "R_386_TLS_LDM_CALL"},
+	{31, "R_386_TLS_LDM_POP"},
+	{32, "R_386_TLS_LDO_32"},
+	{33, "R_386_TLS_IE_32"},
+	{34, "R_386_TLS_LE_32"},
+	{35, "R_386_TLS_DTPMOD32"},
+	{36, "R_386_TLS_DTPOFF32"},
+	{37, "R_386_TLS_TPOFF32"},
+	{38, "R_386_SIZE32"},
+	{39, "R_386_TLS_GOTDESC"},
+	{40, "R_386_TLS_DESC_CALL"},
+	{41, "R_386_TLS_DESC"},
+	{42, "R_386_IRELATIVE"},
+	{43, "R_386_GOT32X"},
+}
+
+func (i R_386) String() string   { return stringName(uint32(i), r386Strings, false) }
+func (i R_386) GoString() string { return stringName(uint32(i), r386Strings, true) }
+
+// Relocation types for MIPS.
+type R_MIPS int
+
+const (
+	R_MIPS_NONE          R_MIPS = 0
+	R_MIPS_16            R_MIPS = 1
+	R_MIPS_32            R_MIPS = 2
+	R_MIPS_REL32         R_MIPS = 3
+	R_MIPS_26            R_MIPS = 4
+	R_MIPS_HI16          R_MIPS = 5  /* high 16 bits of symbol value */
+	R_MIPS_LO16          R_MIPS = 6  /* low 16 bits of symbol value */
+	R_MIPS_GPREL16       R_MIPS = 7  /* GP-relative reference  */
+	R_MIPS_LITERAL       R_MIPS = 8  /* Reference to literal section  */
+	R_MIPS_GOT16         R_MIPS = 9  /* Reference to global offset table */
+	R_MIPS_PC16          R_MIPS = 10 /* 16 bit PC relative reference */
+	R_MIPS_CALL16        R_MIPS = 11 /* 16 bit call through glbl offset tbl */
+	R_MIPS_GPREL32       R_MIPS = 12
+	R_MIPS_SHIFT5        R_MIPS = 16
+	R_MIPS_SHIFT6        R_MIPS = 17
+	R_MIPS_64            R_MIPS = 18
+	R_MIPS_GOT_DISP      R_MIPS = 19
+	R_MIPS_GOT_PAGE      R_MIPS = 20
+	R_MIPS_GOT_OFST      R_MIPS = 21
+	R_MIPS_GOT_HI16      R_MIPS = 22
+	R_MIPS_GOT_LO16      R_MIPS = 23
+	R_MIPS_SUB           R_MIPS = 24
+	R_MIPS_INSERT_A      R_MIPS = 25
+	R_MIPS_INSERT_B      R_MIPS = 26
+	R_MIPS_DELETE        R_MIPS = 27
+	R_MIPS_HIGHER        R_MIPS = 28
+	R_MIPS_HIGHEST       R_MIPS = 29
+	R_MIPS_CALL_HI16     R_MIPS = 30
+	R_MIPS_CALL_LO16     R_MIPS = 31
+	R_MIPS_SCN_DISP      R_MIPS = 32
+	R_MIPS_REL16         R_MIPS = 33
+	R_MIPS_ADD_IMMEDIATE R_MIPS = 34
+	R_MIPS_PJUMP         R_MIPS = 35
+	R_MIPS_RELGOT        R_MIPS = 36
+	R_MIPS_JALR          R_MIPS = 37
+
+	R_MIPS_TLS_DTPMOD32    R_MIPS = 38 /* Module number 32 bit */
+	R_MIPS_TLS_DTPREL32    R_MIPS = 39 /* Module-relative offset 32 bit */
+	R_MIPS_TLS_DTPMOD64    R_MIPS = 40 /* Module number 64 bit */
+	R_MIPS_TLS_DTPREL64    R_MIPS = 41 /* Module-relative offset 64 bit */
+	R_MIPS_TLS_GD          R_MIPS = 42 /* 16 bit GOT offset for GD */
+	R_MIPS_TLS_LDM         R_MIPS = 43 /* 16 bit GOT offset for LDM */
+	R_MIPS_TLS_DTPREL_HI16 R_MIPS = 44 /* Module-relative offset, high 16 bits */
+	R_MIPS_TLS_DTPREL_LO16 R_MIPS = 45 /* Module-relative offset, low 16 bits */
+	R_MIPS_TLS_GOTTPREL    R_MIPS = 46 /* 16 bit GOT offset for IE */
+	R_MIPS_TLS_TPREL32     R_MIPS = 47 /* TP-relative offset, 32 bit */
+	R_MIPS_TLS_TPREL64     R_MIPS = 48 /* TP-relative offset, 64 bit */
+	R_MIPS_TLS_TPREL_HI16  R_MIPS = 49 /* TP-relative offset, high 16 bits */
+	R_MIPS_TLS_TPREL_LO16  R_MIPS = 50 /* TP-relative offset, low 16 bits */
+)
+
+var rmipsStrings = []intName{
+	{0, "R_MIPS_NONE"},
+	{1, "R_MIPS_16"},
+	{2, "R_MIPS_32"},
+	{3, "R_MIPS_REL32"},
+	{4, "R_MIPS_26"},
+	{5, "R_MIPS_HI16"},
+	{6, "R_MIPS_LO16"},
+	{7, "R_MIPS_GPREL16"},
+	{8, "R_MIPS_LITERAL"},
+	{9, "R_MIPS_GOT16"},
+	{10, "R_MIPS_PC16"},
+	{11, "R_MIPS_CALL16"},
+	{12, "R_MIPS_GPREL32"},
+	{16, "R_MIPS_SHIFT5"},
+	{17, "R_MIPS_SHIFT6"},
+	{18, "R_MIPS_64"},
+	{19, "R_MIPS_GOT_DISP"},
+	{20, "R_MIPS_GOT_PAGE"},
+	{21, "R_MIPS_GOT_OFST"},
+	{22, "R_MIPS_GOT_HI16"},
+	{23, "R_MIPS_GOT_LO16"},
+	{24, "R_MIPS_SUB"},
+	{25, "R_MIPS_INSERT_A"},
+	{26, "R_MIPS_INSERT_B"},
+	{27, "R_MIPS_DELETE"},
+	{28, "R_MIPS_HIGHER"},
+	{29, "R_MIPS_HIGHEST"},
+	{30, "R_MIPS_CALL_HI16"},
+	{31, "R_MIPS_CALL_LO16"},
+	{32, "R_MIPS_SCN_DISP"},
+	{33, "R_MIPS_REL16"},
+	{34, "R_MIPS_ADD_IMMEDIATE"},
+	{35, "R_MIPS_PJUMP"},
+	{36, "R_MIPS_RELGOT"},
+	{37, "R_MIPS_JALR"},
+	{38, "R_MIPS_TLS_DTPMOD32"},
+	{39, "R_MIPS_TLS_DTPREL32"},
+	{40, "R_MIPS_TLS_DTPMOD64"},
+	{41, "R_MIPS_TLS_DTPREL64"},
+	{42, "R_MIPS_TLS_GD"},
+	{43, "R_MIPS_TLS_LDM"},
+	{44, "R_MIPS_TLS_DTPREL_HI16"},
+	{45, "R_MIPS_TLS_DTPREL_LO16"},
+	{46, "R_MIPS_TLS_GOTTPREL"},
+	{47, "R_MIPS_TLS_TPREL32"},
+	{48, "R_MIPS_TLS_TPREL64"},
+	{49, "R_MIPS_TLS_TPREL_HI16"},
+	{50, "R_MIPS_TLS_TPREL_LO16"},
+}
+
+func (i R_MIPS) String() string   { return stringName(uint32(i), rmipsStrings, false) }
+func (i R_MIPS) GoString() string { return stringName(uint32(i), rmipsStrings, true) }
+
+// Relocation types for PowerPC.
+//
+// Values that are shared by both R_PPC and R_PPC64 are prefixed with
+// R_POWERPC_ in the ELF standard. For the R_PPC type, the relevant
+// shared relocations have been renamed with the prefix R_PPC_.
+// The original name follows the value in a comment.
+type R_PPC int
+
+const (
+	R_PPC_NONE            R_PPC = 0  // R_POWERPC_NONE
+	R_PPC_ADDR32          R_PPC = 1  // R_POWERPC_ADDR32
+	R_PPC_ADDR24          R_PPC = 2  // R_POWERPC_ADDR24
+	R_PPC_ADDR16          R_PPC = 3  // R_POWERPC_ADDR16
+	R_PPC_ADDR16_LO       R_PPC = 4  // R_POWERPC_ADDR16_LO
+	R_PPC_ADDR16_HI       R_PPC = 5  // R_POWERPC_ADDR16_HI
+	R_PPC_ADDR16_HA       R_PPC = 6  // R_POWERPC_ADDR16_HA
+	R_PPC_ADDR14          R_PPC = 7  // R_POWERPC_ADDR14
+	R_PPC_ADDR14_BRTAKEN  R_PPC = 8  // R_POWERPC_ADDR14_BRTAKEN
+	R_PPC_ADDR14_BRNTAKEN R_PPC = 9  // R_POWERPC_ADDR14_BRNTAKEN
+	R_PPC_REL24           R_PPC = 10 // R_POWERPC_REL24
+	R_PPC_REL14           R_PPC = 11 // R_POWERPC_REL14
+	R_PPC_REL14_BRTAKEN   R_PPC = 12 // R_POWERPC_REL14_BRTAKEN
+	R_PPC_REL14_BRNTAKEN  R_PPC = 13 // R_POWERPC_REL14_BRNTAKEN
+	R_PPC_GOT16           R_PPC = 14 // R_POWERPC_GOT16
+	R_PPC_GOT16_LO        R_PPC = 15 // R_POWERPC_GOT16_LO
+	R_PPC_GOT16_HI        R_PPC = 16 // R_POWERPC_GOT16_HI
+	R_PPC_GOT16_HA        R_PPC = 17 // R_POWERPC_GOT16_HA
+	R_PPC_PLTREL24        R_PPC = 18
+	R_PPC_COPY            R_PPC = 19 // R_POWERPC_COPY
+	R_PPC_GLOB_DAT        R_PPC = 20 // R_POWERPC_GLOB_DAT
+	R_PPC_JMP_SLOT        R_PPC = 21 // R_POWERPC_JMP_SLOT
+	R_PPC_RELATIVE        R_PPC = 22 // R_POWERPC_RELATIVE
+	R_PPC_LOCAL24PC       R_PPC = 23
+	R_PPC_UADDR32         R_PPC = 24 // R_POWERPC_UADDR32
+	R_PPC_UADDR16         R_PPC = 25 // R_POWERPC_UADDR16
+	R_PPC_REL32           R_PPC = 26 // R_POWERPC_REL32
+	R_PPC_PLT32           R_PPC = 27 // R_POWERPC_PLT32
+	R_PPC_PLTREL32        R_PPC = 28 // R_POWERPC_PLTREL32
+	R_PPC_PLT16_LO        R_PPC = 29 // R_POWERPC_PLT16_LO
+	R_PPC_PLT16_HI        R_PPC = 30 // R_POWERPC_PLT16_HI
+	R_PPC_PLT16_HA        R_PPC = 31 // R_POWERPC_PLT16_HA
+	R_PPC_SDAREL16        R_PPC = 32
+	R_PPC_SECTOFF         R_PPC = 33 // R_POWERPC_SECTOFF
+	R_PPC_SECTOFF_LO      R_PPC = 34 // R_POWERPC_SECTOFF_LO
+	R_PPC_SECTOFF_HI      R_PPC = 35 // R_POWERPC_SECTOFF_HI
+	R_PPC_SECTOFF_HA      R_PPC = 36 // R_POWERPC_SECTOFF_HA
+	R_PPC_TLS             R_PPC = 67 // R_POWERPC_TLS
+	R_PPC_DTPMOD32        R_PPC = 68 // R_POWERPC_DTPMOD32
+	R_PPC_TPREL16         R_PPC = 69 // R_POWERPC_TPREL16
+	R_PPC_TPREL16_LO      R_PPC = 70 // R_POWERPC_TPREL16_LO
+	R_PPC_TPREL16_HI      R_PPC = 71 // R_POWERPC_TPREL16_HI
+	R_PPC_TPREL16_HA      R_PPC = 72 // R_POWERPC_TPREL16_HA
+	R_PPC_TPREL32         R_PPC = 73 // R_POWERPC_TPREL32
+	R_PPC_DTPREL16        R_PPC = 74 // R_POWERPC_DTPREL16
+	R_PPC_DTPREL16_LO     R_PPC = 75 // R_POWERPC_DTPREL16_LO
+	R_PPC_DTPREL16_HI     R_PPC = 76 // R_POWERPC_DTPREL16_HI
+	R_PPC_DTPREL16_HA     R_PPC = 77 // R_POWERPC_DTPREL16_HA
+	R_PPC_DTPREL32        R_PPC = 78 // R_POWERPC_DTPREL32
+	R_PPC_GOT_TLSGD16     R_PPC = 79 // R_POWERPC_GOT_TLSGD16
+	R_PPC_GOT_TLSGD16_LO  R_PPC = 80 // R_POWERPC_GOT_TLSGD16_LO
+	R_PPC_GOT_TLSGD16_HI  R_PPC = 81 // R_POWERPC_GOT_TLSGD16_HI
+	R_PPC_GOT_TLSGD16_HA  R_PPC = 82 // R_POWERPC_GOT_TLSGD16_HA
+	R_PPC_GOT_TLSLD16     R_PPC = 83 // R_POWERPC_GOT_TLSLD16
+	R_PPC_GOT_TLSLD16_LO  R_PPC = 84 // R_POWERPC_GOT_TLSLD16_LO
+	R_PPC_GOT_TLSLD16_HI  R_PPC = 85 // R_POWERPC_GOT_TLSLD16_HI
+	R_PPC_GOT_TLSLD16_HA  R_PPC = 86 // R_POWERPC_GOT_TLSLD16_HA
+	R_PPC_GOT_TPREL16     R_PPC = 87 // R_POWERPC_GOT_TPREL16
+	R_PPC_GOT_TPREL16_LO  R_PPC = 88 // R_POWERPC_GOT_TPREL16_LO
+	R_PPC_GOT_TPREL16_HI  R_PPC = 89 // R_POWERPC_GOT_TPREL16_HI
+	R_PPC_GOT_TPREL16_HA  R_PPC = 90 // R_POWERPC_GOT_TPREL16_HA
+	R_PPC_EMB_NADDR32     R_PPC = 101
+	R_PPC_EMB_NADDR16     R_PPC = 102
+	R_PPC_EMB_NADDR16_LO  R_PPC = 103
+	R_PPC_EMB_NADDR16_HI  R_PPC = 104
+	R_PPC_EMB_NADDR16_HA  R_PPC = 105
+	R_PPC_EMB_SDAI16      R_PPC = 106
+	R_PPC_EMB_SDA2I16     R_PPC = 107
+	R_PPC_EMB_SDA2REL     R_PPC = 108
+	R_PPC_EMB_SDA21       R_PPC = 109
+	R_PPC_EMB_MRKREF      R_PPC = 110
+	R_PPC_EMB_RELSEC16    R_PPC = 111
+	R_PPC_EMB_RELST_LO    R_PPC = 112
+	R_PPC_EMB_RELST_HI    R_PPC = 113
+	R_PPC_EMB_RELST_HA    R_PPC = 114
+	R_PPC_EMB_BIT_FLD     R_PPC = 115
+	R_PPC_EMB_RELSDA      R_PPC = 116
+)
+
+var rppcStrings = []intName{
+	{0, "R_PPC_NONE"},
+	{1, "R_PPC_ADDR32"},
+	{2, "R_PPC_ADDR24"},
+	{3, "R_PPC_ADDR16"},
+	{4, "R_PPC_ADDR16_LO"},
+	{5, "R_PPC_ADDR16_HI"},
+	{6, "R_PPC_ADDR16_HA"},
+	{7, "R_PPC_ADDR14"},
+	{8, "R_PPC_ADDR14_BRTAKEN"},
+	{9, "R_PPC_ADDR14_BRNTAKEN"},
+	{10, "R_PPC_REL24"},
+	{11, "R_PPC_REL14"},
+	{12, "R_PPC_REL14_BRTAKEN"},
+	{13, "R_PPC_REL14_BRNTAKEN"},
+	{14, "R_PPC_GOT16"},
+	{15, "R_PPC_GOT16_LO"},
+	{16, "R_PPC_GOT16_HI"},
+	{17, "R_PPC_GOT16_HA"},
+	{18, "R_PPC_PLTREL24"},
+	{19, "R_PPC_COPY"},
+	{20, "R_PPC_GLOB_DAT"},
+	{21, "R_PPC_JMP_SLOT"},
+	{22, "R_PPC_RELATIVE"},
+	{23, "R_PPC_LOCAL24PC"},
+	{24, "R_PPC_UADDR32"},
+	{25, "R_PPC_UADDR16"},
+	{26, "R_PPC_REL32"},
+	{27, "R_PPC_PLT32"},
+	{28, "R_PPC_PLTREL32"},
+	{29, "R_PPC_PLT16_LO"},
+	{30, "R_PPC_PLT16_HI"},
+	{31, "R_PPC_PLT16_HA"},
+	{32, "R_PPC_SDAREL16"},
+	{33, "R_PPC_SECTOFF"},
+	{34, "R_PPC_SECTOFF_LO"},
+	{35, "R_PPC_SECTOFF_HI"},
+	{36, "R_PPC_SECTOFF_HA"},
+	{67, "R_PPC_TLS"},
+	{68, "R_PPC_DTPMOD32"},
+	{69, "R_PPC_TPREL16"},
+	{70, "R_PPC_TPREL16_LO"},
+	{71, "R_PPC_TPREL16_HI"},
+	{72, "R_PPC_TPREL16_HA"},
+	{73, "R_PPC_TPREL32"},
+	{74, "R_PPC_DTPREL16"},
+	{75, "R_PPC_DTPREL16_LO"},
+	{76, "R_PPC_DTPREL16_HI"},
+	{77, "R_PPC_DTPREL16_HA"},
+	{78, "R_PPC_DTPREL32"},
+	{79, "R_PPC_GOT_TLSGD16"},
+	{80, "R_PPC_GOT_TLSGD16_LO"},
+	{81, "R_PPC_GOT_TLSGD16_HI"},
+	{82, "R_PPC_GOT_TLSGD16_HA"},
+	{83, "R_PPC_GOT_TLSLD16"},
+	{84, "R_PPC_GOT_TLSLD16_LO"},
+	{85, "R_PPC_GOT_TLSLD16_HI"},
+	{86, "R_PPC_GOT_TLSLD16_HA"},
+	{87, "R_PPC_GOT_TPREL16"},
+	{88, "R_PPC_GOT_TPREL16_LO"},
+	{89, "R_PPC_GOT_TPREL16_HI"},
+	{90, "R_PPC_GOT_TPREL16_HA"},
+	{101, "R_PPC_EMB_NADDR32"},
+	{102, "R_PPC_EMB_NADDR16"},
+	{103, "R_PPC_EMB_NADDR16_LO"},
+	{104, "R_PPC_EMB_NADDR16_HI"},
+	{105, "R_PPC_EMB_NADDR16_HA"},
+	{106, "R_PPC_EMB_SDAI16"},
+	{107, "R_PPC_EMB_SDA2I16"},
+	{108, "R_PPC_EMB_SDA2REL"},
+	{109, "R_PPC_EMB_SDA21"},
+	{110, "R_PPC_EMB_MRKREF"},
+	{111, "R_PPC_EMB_RELSEC16"},
+	{112, "R_PPC_EMB_RELST_LO"},
+	{113, "R_PPC_EMB_RELST_HI"},
+	{114, "R_PPC_EMB_RELST_HA"},
+	{115, "R_PPC_EMB_BIT_FLD"},
+	{116, "R_PPC_EMB_RELSDA"},
+}
+
+func (i R_PPC) String() string   { return stringName(uint32(i), rppcStrings, false) }
+func (i R_PPC) GoString() string { return stringName(uint32(i), rppcStrings, true) }
+
+// Relocation types for 64-bit PowerPC or Power Architecture processors.
+//
+// Values that are shared by both R_PPC and R_PPC64 are prefixed with
+// R_POWERPC_ in the ELF standard. For the R_PPC64 type, the relevant
+// shared relocations have been renamed with the prefix R_PPC64_.
+// The original name follows the value in a comment.
+type R_PPC64 int
+
+const (
+	R_PPC64_NONE               R_PPC64 = 0  // R_POWERPC_NONE
+	R_PPC64_ADDR32             R_PPC64 = 1  // R_POWERPC_ADDR32
+	R_PPC64_ADDR24             R_PPC64 = 2  // R_POWERPC_ADDR24
+	R_PPC64_ADDR16             R_PPC64 = 3  // R_POWERPC_ADDR16
+	R_PPC64_ADDR16_LO          R_PPC64 = 4  // R_POWERPC_ADDR16_LO
+	R_PPC64_ADDR16_HI          R_PPC64 = 5  // R_POWERPC_ADDR16_HI
+	R_PPC64_ADDR16_HA          R_PPC64 = 6  // R_POWERPC_ADDR16_HA
+	R_PPC64_ADDR14             R_PPC64 = 7  // R_POWERPC_ADDR14
+	R_PPC64_ADDR14_BRTAKEN     R_PPC64 = 8  // R_POWERPC_ADDR14_BRTAKEN
+	R_PPC64_ADDR14_BRNTAKEN    R_PPC64 = 9  // R_POWERPC_ADDR14_BRNTAKEN
+	R_PPC64_REL24              R_PPC64 = 10 // R_POWERPC_REL24
+	R_PPC64_REL14              R_PPC64 = 11 // R_POWERPC_REL14
+	R_PPC64_REL14_BRTAKEN      R_PPC64 = 12 // R_POWERPC_REL14_BRTAKEN
+	R_PPC64_REL14_BRNTAKEN     R_PPC64 = 13 // R_POWERPC_REL14_BRNTAKEN
+	R_PPC64_GOT16              R_PPC64 = 14 // R_POWERPC_GOT16
+	R_PPC64_GOT16_LO           R_PPC64 = 15 // R_POWERPC_GOT16_LO
+	R_PPC64_GOT16_HI           R_PPC64 = 16 // R_POWERPC_GOT16_HI
+	R_PPC64_GOT16_HA           R_PPC64 = 17 // R_POWERPC_GOT16_HA
+	R_PPC64_JMP_SLOT           R_PPC64 = 21 // R_POWERPC_JMP_SLOT
+	R_PPC64_REL32              R_PPC64 = 26 // R_POWERPC_REL32
+	R_PPC64_ADDR64             R_PPC64 = 38
+	R_PPC64_ADDR16_HIGHER      R_PPC64 = 39
+	R_PPC64_ADDR16_HIGHERA     R_PPC64 = 40
+	R_PPC64_ADDR16_HIGHEST     R_PPC64 = 41
+	R_PPC64_ADDR16_HIGHESTA    R_PPC64 = 42
+	R_PPC64_REL64              R_PPC64 = 44
+	R_PPC64_TOC16              R_PPC64 = 47
+	R_PPC64_TOC16_LO           R_PPC64 = 48
+	R_PPC64_TOC16_HI           R_PPC64 = 49
+	R_PPC64_TOC16_HA           R_PPC64 = 50
+	R_PPC64_TOC                R_PPC64 = 51
+	R_PPC64_PLTGOT16           R_PPC64 = 52
+	R_PPC64_PLTGOT16_LO        R_PPC64 = 53
+	R_PPC64_PLTGOT16_HI        R_PPC64 = 54
+	R_PPC64_PLTGOT16_HA        R_PPC64 = 55
+	R_PPC64_ADDR16_DS          R_PPC64 = 56
+	R_PPC64_ADDR16_LO_DS       R_PPC64 = 57
+	R_PPC64_GOT16_DS           R_PPC64 = 58
+	R_PPC64_GOT16_LO_DS        R_PPC64 = 59
+	R_PPC64_PLT16_LO_DS        R_PPC64 = 60
+	R_PPC64_SECTOFF_DS         R_PPC64 = 61
+	R_PPC64_SECTOFF_LO_DS      R_PPC64 = 61
+	R_PPC64_TOC16_DS           R_PPC64 = 63
+	R_PPC64_TOC16_LO_DS        R_PPC64 = 64
+	R_PPC64_PLTGOT16_DS        R_PPC64 = 65
+	R_PPC64_PLTGOT_LO_DS       R_PPC64 = 66
+	R_PPC64_TLS                R_PPC64 = 67 // R_POWERPC_TLS
+	R_PPC64_DTPMOD64           R_PPC64 = 68 // R_POWERPC_DTPMOD64
+	R_PPC64_TPREL16            R_PPC64 = 69 // R_POWERPC_TPREL16
+	R_PPC64_TPREL16_LO         R_PPC64 = 70 // R_POWERPC_TPREL16_LO
+	R_PPC64_TPREL16_HI         R_PPC64 = 71 // R_POWERPC_TPREL16_HI
+	R_PPC64_TPREL16_HA         R_PPC64 = 72 // R_POWERPC_TPREL16_HA
+	R_PPC64_TPREL64            R_PPC64 = 73 // R_POWERPC_TPREL64
+	R_PPC64_DTPREL16           R_PPC64 = 74 // R_POWERPC_DTPREL16
+	R_PPC64_DTPREL16_LO        R_PPC64 = 75 // R_POWERPC_DTPREL16_LO
+	R_PPC64_DTPREL16_HI        R_PPC64 = 76 // R_POWERPC_DTPREL16_HI
+	R_PPC64_DTPREL16_HA        R_PPC64 = 77 // R_POWERPC_DTPREL16_HA
+	R_PPC64_DTPREL64           R_PPC64 = 78 // R_POWERPC_DTPREL64
+	R_PPC64_GOT_TLSGD16        R_PPC64 = 79 // R_POWERPC_GOT_TLSGD16
+	R_PPC64_GOT_TLSGD16_LO     R_PPC64 = 80 // R_POWERPC_GOT_TLSGD16_LO
+	R_PPC64_GOT_TLSGD16_HI     R_PPC64 = 81 // R_POWERPC_GOT_TLSGD16_HI
+	R_PPC64_GOT_TLSGD16_HA     R_PPC64 = 82 // R_POWERPC_GOT_TLSGD16_HA
+	R_PPC64_GOT_TLSLD16        R_PPC64 = 83 // R_POWERPC_GOT_TLSLD16
+	R_PPC64_GOT_TLSLD16_LO     R_PPC64 = 84 // R_POWERPC_GOT_TLSLD16_LO
+	R_PPC64_GOT_TLSLD16_HI     R_PPC64 = 85 // R_POWERPC_GOT_TLSLD16_HI
+	R_PPC64_GOT_TLSLD16_HA     R_PPC64 = 86 // R_POWERPC_GOT_TLSLD16_HA
+	R_PPC64_GOT_TPREL16_DS     R_PPC64 = 87 // R_POWERPC_GOT_TPREL16_DS
+	R_PPC64_GOT_TPREL16_LO_DS  R_PPC64 = 88 // R_POWERPC_GOT_TPREL16_LO_DS
+	R_PPC64_GOT_TPREL16_HI     R_PPC64 = 89 // R_POWERPC_GOT_TPREL16_HI
+	R_PPC64_GOT_TPREL16_HA     R_PPC64 = 90 // R_POWERPC_GOT_TPREL16_HA
+	R_PPC64_GOT_DTPREL16_DS    R_PPC64 = 91 // R_POWERPC_GOT_DTPREL16_DS
+	R_PPC64_GOT_DTPREL16_LO_DS R_PPC64 = 92 // R_POWERPC_GOT_DTPREL16_LO_DS
+	R_PPC64_GOT_DTPREL16_HI    R_PPC64 = 93 // R_POWERPC_GOT_DTPREL16_HI
+	R_PPC64_GOT_DTPREL16_HA    R_PPC64 = 94 // R_POWERPC_GOT_DTPREL16_HA
+	R_PPC64_TPREL16_DS         R_PPC64 = 95
+	R_PPC64_TPREL16_LO_DS      R_PPC64 = 96
+	R_PPC64_TPREL16_HIGHER     R_PPC64 = 97
+	R_PPC64_TPREL16_HIGHERA    R_PPC64 = 98
+	R_PPC64_TPREL16_HIGHEST    R_PPC64 = 99
+	R_PPC64_TPREL16_HIGHESTA   R_PPC64 = 100
+	R_PPC64_DTPREL16_DS        R_PPC64 = 101
+	R_PPC64_DTPREL16_LO_DS     R_PPC64 = 102
+	R_PPC64_DTPREL16_HIGHER    R_PPC64 = 103
+	R_PPC64_DTPREL16_HIGHERA   R_PPC64 = 104
+	R_PPC64_DTPREL16_HIGHEST   R_PPC64 = 105
+	R_PPC64_DTPREL16_HIGHESTA  R_PPC64 = 106
+	R_PPC64_TLSGD              R_PPC64 = 107
+	R_PPC64_TLSLD              R_PPC64 = 108
+	R_PPC64_TOCSAVE            R_PPC64 = 109
+	R_PPC64_ADDR16_HIGH        R_PPC64 = 110
+	R_PPC64_ADDR16_HIGHA       R_PPC64 = 111
+	R_PPC64_TPREL16_HIGH       R_PPC64 = 112
+	R_PPC64_TPREL16_HIGHA      R_PPC64 = 113
+	R_PPC64_DTPREL16_HIGH      R_PPC64 = 114
+	R_PPC64_DTPREL16_HIGHA     R_PPC64 = 115
+	R_PPC64_REL24_NOTOC        R_PPC64 = 116
+	R_PPC64_ADDR64_LOCAL       R_PPC64 = 117
+	R_PPC64_ENTRY              R_PPC64 = 118
+	R_PPC64_REL16DX_HA         R_PPC64 = 246 // R_POWERPC_REL16DX_HA
+	R_PPC64_JMP_IREL           R_PPC64 = 247
+	R_PPC64_IRELATIVE          R_PPC64 = 248 // R_POWERPC_IRELATIVE
+	R_PPC64_REL16              R_PPC64 = 249 // R_POWERPC_REL16
+	R_PPC64_REL16_LO           R_PPC64 = 250 // R_POWERPC_REL16_LO
+	R_PPC64_REL16_HI           R_PPC64 = 251 // R_POWERPC_REL16_HI
+	R_PPC64_REL16_HA           R_PPC64 = 252 // R_POWERPC_REL16_HA
+)
+
+var rppc64Strings = []intName{
+	{0, "R_PPC64_NONE"},
+	{1, "R_PPC64_ADDR32"},
+	{2, "R_PPC64_ADDR24"},
+	{3, "R_PPC64_ADDR16"},
+	{4, "R_PPC64_ADDR16_LO"},
+	{5, "R_PPC64_ADDR16_HI"},
+	{6, "R_PPC64_ADDR16_HA"},
+	{7, "R_PPC64_ADDR14"},
+	{8, "R_PPC64_ADDR14_BRTAKEN"},
+	{9, "R_PPC64_ADDR14_BRNTAKEN"},
+	{10, "R_PPC64_REL24"},
+	{11, "R_PPC64_REL14"},
+	{12, "R_PPC64_REL14_BRTAKEN"},
+	{13, "R_PPC64_REL14_BRNTAKEN"},
+	{14, "R_PPC64_GOT16"},
+	{15, "R_PPC64_GOT16_LO"},
+	{16, "R_PPC64_GOT16_HI"},
+	{17, "R_PPC64_GOT16_HA"},
+	{21, "R_PPC64_JMP_SLOT"},
+	{26, "R_PPC64_REL32"},
+	{38, "R_PPC64_ADDR64"},
+	{39, "R_PPC64_ADDR16_HIGHER"},
+	{40, "R_PPC64_ADDR16_HIGHERA"},
+	{41, "R_PPC64_ADDR16_HIGHEST"},
+	{42, "R_PPC64_ADDR16_HIGHESTA"},
+	{44, "R_PPC64_REL64"},
+	{47, "R_PPC64_TOC16"},
+	{48, "R_PPC64_TOC16_LO"},
+	{49, "R_PPC64_TOC16_HI"},
+	{50, "R_PPC64_TOC16_HA"},
+	{51, "R_PPC64_TOC"},
+	{52, "R_PPC64_PLTGOT16"},
+	{53, "R_PPC64_PLTGOT16_LO"},
+	{54, "R_PPC64_PLTGOT16_HI"},
+	{55, "R_PPC64_PLTGOT16_HA"},
+	{56, "R_PPC64_ADDR16_DS"},
+	{57, "R_PPC64_ADDR16_LO_DS"},
+	{58, "R_PPC64_GOT16_DS"},
+	{59, "R_PPC64_GOT16_LO_DS"},
+	{60, "R_PPC64_PLT16_LO_DS"},
+	{61, "R_PPC64_SECTOFF_DS"},
+	{61, "R_PPC64_SECTOFF_LO_DS"},
+	{63, "R_PPC64_TOC16_DS"},
+	{64, "R_PPC64_TOC16_LO_DS"},
+	{65, "R_PPC64_PLTGOT16_DS"},
+	{66, "R_PPC64_PLTGOT_LO_DS"},
+	{67, "R_PPC64_TLS"},
+	{68, "R_PPC64_DTPMOD64"},
+	{69, "R_PPC64_TPREL16"},
+	{70, "R_PPC64_TPREL16_LO"},
+	{71, "R_PPC64_TPREL16_HI"},
+	{72, "R_PPC64_TPREL16_HA"},
+	{73, "R_PPC64_TPREL64"},
+	{74, "R_PPC64_DTPREL16"},
+	{75, "R_PPC64_DTPREL16_LO"},
+	{76, "R_PPC64_DTPREL16_HI"},
+	{77, "R_PPC64_DTPREL16_HA"},
+	{78, "R_PPC64_DTPREL64"},
+	{79, "R_PPC64_GOT_TLSGD16"},
+	{80, "R_PPC64_GOT_TLSGD16_LO"},
+	{81, "R_PPC64_GOT_TLSGD16_HI"},
+	{82, "R_PPC64_GOT_TLSGD16_HA"},
+	{83, "R_PPC64_GOT_TLSLD16"},
+	{84, "R_PPC64_GOT_TLSLD16_LO"},
+	{85, "R_PPC64_GOT_TLSLD16_HI"},
+	{86, "R_PPC64_GOT_TLSLD16_HA"},
+	{87, "R_PPC64_GOT_TPREL16_DS"},
+	{88, "R_PPC64_GOT_TPREL16_LO_DS"},
+	{89, "R_PPC64_GOT_TPREL16_HI"},
+	{90, "R_PPC64_GOT_TPREL16_HA"},
+	{91, "R_PPC64_GOT_DTPREL16_DS"},
+	{92, "R_PPC64_GOT_DTPREL16_LO_DS"},
+	{93, "R_PPC64_GOT_DTPREL16_HI"},
+	{94, "R_PPC64_GOT_DTPREL16_HA"},
+	{95, "R_PPC64_TPREL16_DS"},
+	{96, "R_PPC64_TPREL16_LO_DS"},
+	{97, "R_PPC64_TPREL16_HIGHER"},
+	{98, "R_PPC64_TPREL16_HIGHERA"},
+	{99, "R_PPC64_TPREL16_HIGHEST"},
+	{100, "R_PPC64_TPREL16_HIGHESTA"},
+	{101, "R_PPC64_DTPREL16_DS"},
+	{102, "R_PPC64_DTPREL16_LO_DS"},
+	{103, "R_PPC64_DTPREL16_HIGHER"},
+	{104, "R_PPC64_DTPREL16_HIGHERA"},
+	{105, "R_PPC64_DTPREL16_HIGHEST"},
+	{106, "R_PPC64_DTPREL16_HIGHESTA"},
+	{107, "R_PPC64_TLSGD"},
+	{108, "R_PPC64_TLSLD"},
+	{109, "R_PPC64_TOCSAVE"},
+	{110, "R_PPC64_ADDR16_HIGH"},
+	{111, "R_PPC64_ADDR16_HIGHA"},
+	{112, "R_PPC64_TPREL16_HIGH"},
+	{113, "R_PPC64_TPREL16_HIGHA"},
+	{114, "R_PPC64_DTPREL16_HIGH"},
+	{115, "R_PPC64_DTPREL16_HIGHA"},
+	{116, "R_PPC64_REL24_NOTOC"},
+	{117, "R_PPC64_ADDR64_LOCAL"},
+	{118, "R_PPC64_ENTRY"},
+	{246, "R_PPC64_REL16DX_HA"},
+	{247, "R_PPC64_JMP_IREL"},
+	{248, "R_PPC64_IRELATIVE"},
+	{249, "R_PPC64_REL16"},
+	{250, "R_PPC64_REL16_LO"},
+	{251, "R_PPC64_REL16_HI"},
+	{252, "R_PPC64_REL16_HA"},
+}
+
+func (i R_PPC64) String() string   { return stringName(uint32(i), rppc64Strings, false) }
+func (i R_PPC64) GoString() string { return stringName(uint32(i), rppc64Strings, true) }
+
+// Relocation types for RISC-V processors.
+type R_RISCV int
+
+const (
+	R_RISCV_NONE          R_RISCV = 0  /* No relocation. */
+	R_RISCV_32            R_RISCV = 1  /* Add 32 bit zero extended symbol value */
+	R_RISCV_64            R_RISCV = 2  /* Add 64 bit symbol value. */
+	R_RISCV_RELATIVE      R_RISCV = 3  /* Add load address of shared object. */
+	R_RISCV_COPY          R_RISCV = 4  /* Copy data from shared object. */
+	R_RISCV_JUMP_SLOT     R_RISCV = 5  /* Set GOT entry to code address. */
+	R_RISCV_TLS_DTPMOD32  R_RISCV = 6  /* 32 bit ID of module containing symbol */
+	R_RISCV_TLS_DTPMOD64  R_RISCV = 7  /* ID of module containing symbol */
+	R_RISCV_TLS_DTPREL32  R_RISCV = 8  /* 32 bit relative offset in TLS block */
+	R_RISCV_TLS_DTPREL64  R_RISCV = 9  /* Relative offset in TLS block */
+	R_RISCV_TLS_TPREL32   R_RISCV = 10 /* 32 bit relative offset in static TLS block */
+	R_RISCV_TLS_TPREL64   R_RISCV = 11 /* Relative offset in static TLS block */
+	R_RISCV_BRANCH        R_RISCV = 16 /* PC-relative branch */
+	R_RISCV_JAL           R_RISCV = 17 /* PC-relative jump */
+	R_RISCV_CALL          R_RISCV = 18 /* PC-relative call */
+	R_RISCV_CALL_PLT      R_RISCV = 19 /* PC-relative call (PLT) */
+	R_RISCV_GOT_HI20      R_RISCV = 20 /* PC-relative GOT reference */
+	R_RISCV_TLS_GOT_HI20  R_RISCV = 21 /* PC-relative TLS IE GOT offset */
+	R_RISCV_TLS_GD_HI20   R_RISCV = 22 /* PC-relative TLS GD reference */
+	R_RISCV_PCREL_HI20    R_RISCV = 23 /* PC-relative reference */
+	R_RISCV_PCREL_LO12_I  R_RISCV = 24 /* PC-relative reference */
+	R_RISCV_PCREL_LO12_S  R_RISCV = 25 /* PC-relative reference */
+	R_RISCV_HI20          R_RISCV = 26 /* Absolute address */
+	R_RISCV_LO12_I        R_RISCV = 27 /* Absolute address */
+	R_RISCV_LO12_S        R_RISCV = 28 /* Absolute address */
+	R_RISCV_TPREL_HI20    R_RISCV = 29 /* TLS LE thread offset */
+	R_RISCV_TPREL_LO12_I  R_RISCV = 30 /* TLS LE thread offset */
+	R_RISCV_TPREL_LO12_S  R_RISCV = 31 /* TLS LE thread offset */
+	R_RISCV_TPREL_ADD     R_RISCV = 32 /* TLS LE thread usage */
+	R_RISCV_ADD8          R_RISCV = 33 /* 8-bit label addition */
+	R_RISCV_ADD16         R_RISCV = 34 /* 16-bit label addition */
+	R_RISCV_ADD32         R_RISCV = 35 /* 32-bit label addition */
+	R_RISCV_ADD64         R_RISCV = 36 /* 64-bit label addition */
+	R_RISCV_SUB8          R_RISCV = 37 /* 8-bit label subtraction */
+	R_RISCV_SUB16         R_RISCV = 38 /* 16-bit label subtraction */
+	R_RISCV_SUB32         R_RISCV = 39 /* 32-bit label subtraction */
+	R_RISCV_SUB64         R_RISCV = 40 /* 64-bit label subtraction */
+	R_RISCV_GNU_VTINHERIT R_RISCV = 41 /* GNU C++ vtable hierarchy */
+	R_RISCV_GNU_VTENTRY   R_RISCV = 42 /* GNU C++ vtable member usage */
+	R_RISCV_ALIGN         R_RISCV = 43 /* Alignment statement */
+	R_RISCV_RVC_BRANCH    R_RISCV = 44 /* PC-relative branch offset */
+	R_RISCV_RVC_JUMP      R_RISCV = 45 /* PC-relative jump offset */
+	R_RISCV_RVC_LUI       R_RISCV = 46 /* Absolute address */
+	R_RISCV_GPREL_I       R_RISCV = 47 /* GP-relative reference */
+	R_RISCV_GPREL_S       R_RISCV = 48 /* GP-relative reference */
+	R_RISCV_TPREL_I       R_RISCV = 49 /* TP-relative TLS LE load */
+	R_RISCV_TPREL_S       R_RISCV = 50 /* TP-relative TLS LE store */
+	R_RISCV_RELAX         R_RISCV = 51 /* Instruction pair can be relaxed */
+	R_RISCV_SUB6          R_RISCV = 52 /* Local label subtraction */
+	R_RISCV_SET6          R_RISCV = 53 /* Local label subtraction */
+	R_RISCV_SET8          R_RISCV = 54 /* Local label subtraction */
+	R_RISCV_SET16         R_RISCV = 55 /* Local label subtraction */
+	R_RISCV_SET32         R_RISCV = 56 /* Local label subtraction */
+	R_RISCV_32_PCREL      R_RISCV = 57 /* 32-bit PC relative */
+)
+
+var rriscvStrings = []intName{
+	{0, "R_RISCV_NONE"},
+	{1, "R_RISCV_32"},
+	{2, "R_RISCV_64"},
+	{3, "R_RISCV_RELATIVE"},
+	{4, "R_RISCV_COPY"},
+	{5, "R_RISCV_JUMP_SLOT"},
+	{6, "R_RISCV_TLS_DTPMOD32"},
+	{7, "R_RISCV_TLS_DTPMOD64"},
+	{8, "R_RISCV_TLS_DTPREL32"},
+	{9, "R_RISCV_TLS_DTPREL64"},
+	{10, "R_RISCV_TLS_TPREL32"},
+	{11, "R_RISCV_TLS_TPREL64"},
+	{16, "R_RISCV_BRANCH"},
+	{17, "R_RISCV_JAL"},
+	{18, "R_RISCV_CALL"},
+	{19, "R_RISCV_CALL_PLT"},
+	{20, "R_RISCV_GOT_HI20"},
+	{21, "R_RISCV_TLS_GOT_HI20"},
+	{22, "R_RISCV_TLS_GD_HI20"},
+	{23, "R_RISCV_PCREL_HI20"},
+	{24, "R_RISCV_PCREL_LO12_I"},
+	{25, "R_RISCV_PCREL_LO12_S"},
+	{26, "R_RISCV_HI20"},
+	{27, "R_RISCV_LO12_I"},
+	{28, "R_RISCV_LO12_S"},
+	{29, "R_RISCV_TPREL_HI20"},
+	{30, "R_RISCV_TPREL_LO12_I"},
+	{31, "R_RISCV_TPREL_LO12_S"},
+	{32, "R_RISCV_TPREL_ADD"},
+	{33, "R_RISCV_ADD8"},
+	{34, "R_RISCV_ADD16"},
+	{35, "R_RISCV_ADD32"},
+	{36, "R_RISCV_ADD64"},
+	{37, "R_RISCV_SUB8"},
+	{38, "R_RISCV_SUB16"},
+	{39, "R_RISCV_SUB32"},
+	{40, "R_RISCV_SUB64"},
+	{41, "R_RISCV_GNU_VTINHERIT"},
+	{42, "R_RISCV_GNU_VTENTRY"},
+	{43, "R_RISCV_ALIGN"},
+	{44, "R_RISCV_RVC_BRANCH"},
+	{45, "R_RISCV_RVC_JUMP"},
+	{46, "R_RISCV_RVC_LUI"},
+	{47, "R_RISCV_GPREL_I"},
+	{48, "R_RISCV_GPREL_S"},
+	{49, "R_RISCV_TPREL_I"},
+	{50, "R_RISCV_TPREL_S"},
+	{51, "R_RISCV_RELAX"},
+	{52, "R_RISCV_SUB6"},
+	{53, "R_RISCV_SET6"},
+	{54, "R_RISCV_SET8"},
+	{55, "R_RISCV_SET16"},
+	{56, "R_RISCV_SET32"},
+	{57, "R_RISCV_32_PCREL"},
+}
+
+func (i R_RISCV) String() string   { return stringName(uint32(i), rriscvStrings, false) }
+func (i R_RISCV) GoString() string { return stringName(uint32(i), rriscvStrings, true) }
+
+// Relocation types for s390x processors.
+type R_390 int
+
+const (
+	R_390_NONE        R_390 = 0
+	R_390_8           R_390 = 1
+	R_390_12          R_390 = 2
+	R_390_16          R_390 = 3
+	R_390_32          R_390 = 4
+	R_390_PC32        R_390 = 5
+	R_390_GOT12       R_390 = 6
+	R_390_GOT32       R_390 = 7
+	R_390_PLT32       R_390 = 8
+	R_390_COPY        R_390 = 9
+	R_390_GLOB_DAT    R_390 = 10
+	R_390_JMP_SLOT    R_390 = 11
+	R_390_RELATIVE    R_390 = 12
+	R_390_GOTOFF      R_390 = 13
+	R_390_GOTPC       R_390 = 14
+	R_390_GOT16       R_390 = 15
+	R_390_PC16        R_390 = 16
+	R_390_PC16DBL     R_390 = 17
+	R_390_PLT16DBL    R_390 = 18
+	R_390_PC32DBL     R_390 = 19
+	R_390_PLT32DBL    R_390 = 20
+	R_390_GOTPCDBL    R_390 = 21
+	R_390_64          R_390 = 22
+	R_390_PC64        R_390 = 23
+	R_390_GOT64       R_390 = 24
+	R_390_PLT64       R_390 = 25
+	R_390_GOTENT      R_390 = 26
+	R_390_GOTOFF16    R_390 = 27
+	R_390_GOTOFF64    R_390 = 28
+	R_390_GOTPLT12    R_390 = 29
+	R_390_GOTPLT16    R_390 = 30
+	R_390_GOTPLT32    R_390 = 31
+	R_390_GOTPLT64    R_390 = 32
+	R_390_GOTPLTENT   R_390 = 33
+	R_390_GOTPLTOFF16 R_390 = 34
+	R_390_GOTPLTOFF32 R_390 = 35
+	R_390_GOTPLTOFF64 R_390 = 36
+	R_390_TLS_LOAD    R_390 = 37
+	R_390_TLS_GDCALL  R_390 = 38
+	R_390_TLS_LDCALL  R_390 = 39
+	R_390_TLS_GD32    R_390 = 40
+	R_390_TLS_GD64    R_390 = 41
+	R_390_TLS_GOTIE12 R_390 = 42
+	R_390_TLS_GOTIE32 R_390 = 43
+	R_390_TLS_GOTIE64 R_390 = 44
+	R_390_TLS_LDM32   R_390 = 45
+	R_390_TLS_LDM64   R_390 = 46
+	R_390_TLS_IE32    R_390 = 47
+	R_390_TLS_IE64    R_390 = 48
+	R_390_TLS_IEENT   R_390 = 49
+	R_390_TLS_LE32    R_390 = 50
+	R_390_TLS_LE64    R_390 = 51
+	R_390_TLS_LDO32   R_390 = 52
+	R_390_TLS_LDO64   R_390 = 53
+	R_390_TLS_DTPMOD  R_390 = 54
+	R_390_TLS_DTPOFF  R_390 = 55
+	R_390_TLS_TPOFF   R_390 = 56
+	R_390_20          R_390 = 57
+	R_390_GOT20       R_390 = 58
+	R_390_GOTPLT20    R_390 = 59
+	R_390_TLS_GOTIE20 R_390 = 60
+)
+
+var r390Strings = []intName{
+	{0, "R_390_NONE"},
+	{1, "R_390_8"},
+	{2, "R_390_12"},
+	{3, "R_390_16"},
+	{4, "R_390_32"},
+	{5, "R_390_PC32"},
+	{6, "R_390_GOT12"},
+	{7, "R_390_GOT32"},
+	{8, "R_390_PLT32"},
+	{9, "R_390_COPY"},
+	{10, "R_390_GLOB_DAT"},
+	{11, "R_390_JMP_SLOT"},
+	{12, "R_390_RELATIVE"},
+	{13, "R_390_GOTOFF"},
+	{14, "R_390_GOTPC"},
+	{15, "R_390_GOT16"},
+	{16, "R_390_PC16"},
+	{17, "R_390_PC16DBL"},
+	{18, "R_390_PLT16DBL"},
+	{19, "R_390_PC32DBL"},
+	{20, "R_390_PLT32DBL"},
+	{21, "R_390_GOTPCDBL"},
+	{22, "R_390_64"},
+	{23, "R_390_PC64"},
+	{24, "R_390_GOT64"},
+	{25, "R_390_PLT64"},
+	{26, "R_390_GOTENT"},
+	{27, "R_390_GOTOFF16"},
+	{28, "R_390_GOTOFF64"},
+	{29, "R_390_GOTPLT12"},
+	{30, "R_390_GOTPLT16"},
+	{31, "R_390_GOTPLT32"},
+	{32, "R_390_GOTPLT64"},
+	{33, "R_390_GOTPLTENT"},
+	{34, "R_390_GOTPLTOFF16"},
+	{35, "R_390_GOTPLTOFF32"},
+	{36, "R_390_GOTPLTOFF64"},
+	{37, "R_390_TLS_LOAD"},
+	{38, "R_390_TLS_GDCALL"},
+	{39, "R_390_TLS_LDCALL"},
+	{40, "R_390_TLS_GD32"},
+	{41, "R_390_TLS_GD64"},
+	{42, "R_390_TLS_GOTIE12"},
+	{43, "R_390_TLS_GOTIE32"},
+	{44, "R_390_TLS_GOTIE64"},
+	{45, "R_390_TLS_LDM32"},
+	{46, "R_390_TLS_LDM64"},
+	{47, "R_390_TLS_IE32"},
+	{48, "R_390_TLS_IE64"},
+	{49, "R_390_TLS_IEENT"},
+	{50, "R_390_TLS_LE32"},
+	{51, "R_390_TLS_LE64"},
+	{52, "R_390_TLS_LDO32"},
+	{53, "R_390_TLS_LDO64"},
+	{54, "R_390_TLS_DTPMOD"},
+	{55, "R_390_TLS_DTPOFF"},
+	{56, "R_390_TLS_TPOFF"},
+	{57, "R_390_20"},
+	{58, "R_390_GOT20"},
+	{59, "R_390_GOTPLT20"},
+	{60, "R_390_TLS_GOTIE20"},
+}
+
+func (i R_390) String() string   { return stringName(uint32(i), r390Strings, false) }
+func (i R_390) GoString() string { return stringName(uint32(i), r390Strings, true) }
+
+// Relocation types for SPARC.
+type R_SPARC int
+
+const (
+	R_SPARC_NONE     R_SPARC = 0
+	R_SPARC_8        R_SPARC = 1
+	R_SPARC_16       R_SPARC = 2
+	R_SPARC_32       R_SPARC = 3
+	R_SPARC_DISP8    R_SPARC = 4
+	R_SPARC_DISP16   R_SPARC = 5
+	R_SPARC_DISP32   R_SPARC = 6
+	R_SPARC_WDISP30  R_SPARC = 7
+	R_SPARC_WDISP22  R_SPARC = 8
+	R_SPARC_HI22     R_SPARC = 9
+	R_SPARC_22       R_SPARC = 10
+	R_SPARC_13       R_SPARC = 11
+	R_SPARC_LO10     R_SPARC = 12
+	R_SPARC_GOT10    R_SPARC = 13
+	R_SPARC_GOT13    R_SPARC = 14
+	R_SPARC_GOT22    R_SPARC = 15
+	R_SPARC_PC10     R_SPARC = 16
+	R_SPARC_PC22     R_SPARC = 17
+	R_SPARC_WPLT30   R_SPARC = 18
+	R_SPARC_COPY     R_SPARC = 19
+	R_SPARC_GLOB_DAT R_SPARC = 20
+	R_SPARC_JMP_SLOT R_SPARC = 21
+	R_SPARC_RELATIVE R_SPARC = 22
+	R_SPARC_UA32     R_SPARC = 23
+	R_SPARC_PLT32    R_SPARC = 24
+	R_SPARC_HIPLT22  R_SPARC = 25
+	R_SPARC_LOPLT10  R_SPARC = 26
+	R_SPARC_PCPLT32  R_SPARC = 27
+	R_SPARC_PCPLT22  R_SPARC = 28
+	R_SPARC_PCPLT10  R_SPARC = 29
+	R_SPARC_10       R_SPARC = 30
+	R_SPARC_11       R_SPARC = 31
+	R_SPARC_64       R_SPARC = 32
+	R_SPARC_OLO10    R_SPARC = 33
+	R_SPARC_HH22     R_SPARC = 34
+	R_SPARC_HM10     R_SPARC = 35
+	R_SPARC_LM22     R_SPARC = 36
+	R_SPARC_PC_HH22  R_SPARC = 37
+	R_SPARC_PC_HM10  R_SPARC = 38
+	R_SPARC_PC_LM22  R_SPARC = 39
+	R_SPARC_WDISP16  R_SPARC = 40
+	R_SPARC_WDISP19  R_SPARC = 41
+	R_SPARC_GLOB_JMP R_SPARC = 42
+	R_SPARC_7        R_SPARC = 43
+	R_SPARC_5        R_SPARC = 44
+	R_SPARC_6        R_SPARC = 45
+	R_SPARC_DISP64   R_SPARC = 46
+	R_SPARC_PLT64    R_SPARC = 47
+	R_SPARC_HIX22    R_SPARC = 48
+	R_SPARC_LOX10    R_SPARC = 49
+	R_SPARC_H44      R_SPARC = 50
+	R_SPARC_M44      R_SPARC = 51
+	R_SPARC_L44      R_SPARC = 52
+	R_SPARC_REGISTER R_SPARC = 53
+	R_SPARC_UA64     R_SPARC = 54
+	R_SPARC_UA16     R_SPARC = 55
+)
+
+var rsparcStrings = []intName{
+	{0, "R_SPARC_NONE"},
+	{1, "R_SPARC_8"},
+	{2, "R_SPARC_16"},
+	{3, "R_SPARC_32"},
+	{4, "R_SPARC_DISP8"},
+	{5, "R_SPARC_DISP16"},
+	{6, "R_SPARC_DISP32"},
+	{7, "R_SPARC_WDISP30"},
+	{8, "R_SPARC_WDISP22"},
+	{9, "R_SPARC_HI22"},
+	{10, "R_SPARC_22"},
+	{11, "R_SPARC_13"},
+	{12, "R_SPARC_LO10"},
+	{13, "R_SPARC_GOT10"},
+	{14, "R_SPARC_GOT13"},
+	{15, "R_SPARC_GOT22"},
+	{16, "R_SPARC_PC10"},
+	{17, "R_SPARC_PC22"},
+	{18, "R_SPARC_WPLT30"},
+	{19, "R_SPARC_COPY"},
+	{20, "R_SPARC_GLOB_DAT"},
+	{21, "R_SPARC_JMP_SLOT"},
+	{22, "R_SPARC_RELATIVE"},
+	{23, "R_SPARC_UA32"},
+	{24, "R_SPARC_PLT32"},
+	{25, "R_SPARC_HIPLT22"},
+	{26, "R_SPARC_LOPLT10"},
+	{27, "R_SPARC_PCPLT32"},
+	{28, "R_SPARC_PCPLT22"},
+	{29, "R_SPARC_PCPLT10"},
+	{30, "R_SPARC_10"},
+	{31, "R_SPARC_11"},
+	{32, "R_SPARC_64"},
+	{33, "R_SPARC_OLO10"},
+	{34, "R_SPARC_HH22"},
+	{35, "R_SPARC_HM10"},
+	{36, "R_SPARC_LM22"},
+	{37, "R_SPARC_PC_HH22"},
+	{38, "R_SPARC_PC_HM10"},
+	{39, "R_SPARC_PC_LM22"},
+	{40, "R_SPARC_WDISP16"},
+	{41, "R_SPARC_WDISP19"},
+	{42, "R_SPARC_GLOB_JMP"},
+	{43, "R_SPARC_7"},
+	{44, "R_SPARC_5"},
+	{45, "R_SPARC_6"},
+	{46, "R_SPARC_DISP64"},
+	{47, "R_SPARC_PLT64"},
+	{48, "R_SPARC_HIX22"},
+	{49, "R_SPARC_LOX10"},
+	{50, "R_SPARC_H44"},
+	{51, "R_SPARC_M44"},
+	{52, "R_SPARC_L44"},
+	{53, "R_SPARC_REGISTER"},
+	{54, "R_SPARC_UA64"},
+	{55, "R_SPARC_UA16"},
+}
+
+func (i R_SPARC) String() string   { return stringName(uint32(i), rsparcStrings, false) }
+func (i R_SPARC) GoString() string { return stringName(uint32(i), rsparcStrings, true) }
+
+// Magic number for the elf trampoline, chosen wisely to be an immediate value.
+const ARM_MAGIC_TRAMP_NUMBER = 0x5c000003
+
+// ELF32 File header.
+type Header32 struct {
+	Ident     [EI_NIDENT]byte /* File identification. */
+	Type      uint16          /* File type. */
+	Machine   uint16          /* Machine architecture. */
+	Version   uint32          /* ELF format version. */
+	Entry     uint32          /* Entry point. */
+	Phoff     uint32          /* Program header file offset. */
+	Shoff     uint32          /* Section header file offset. */
+	Flags     uint32          /* Architecture-specific flags. */
+	Ehsize    uint16          /* Size of ELF header in bytes. */
+	Phentsize uint16          /* Size of program header entry. */
+	Phnum     uint16          /* Number of program header entries. */
+	Shentsize uint16          /* Size of section header entry. */
+	Shnum     uint16          /* Number of section header entries. */
+	Shstrndx  uint16          /* Section name strings section. */
+}
+
+// ELF32 Section header.
+type Section32 struct {
+	Name      uint32 /* Section name (index into the section header string table). */
+	Type      uint32 /* Section type. */
+	Flags     uint32 /* Section flags. */
+	Addr      uint32 /* Address in memory image. */
+	Off       uint32 /* Offset in file. */
+	Size      uint32 /* Size in bytes. */
+	Link      uint32 /* Index of a related section. */
+	Info      uint32 /* Depends on section type. */
+	Addralign uint32 /* Alignment in bytes. */
+	Entsize   uint32 /* Size of each entry in section. */
+}
+
+// ELF32 Program header.
+type Prog32 struct {
+	Type   uint32 /* Entry type. */
+	Off    uint32 /* File offset of contents. */
+	Vaddr  uint32 /* Virtual address in memory image. */
+	Paddr  uint32 /* Physical address (not used). */
+	Filesz uint32 /* Size of contents in file. */
+	Memsz  uint32 /* Size of contents in memory. */
+	Flags  uint32 /* Access permission flags. */
+	Align  uint32 /* Alignment in memory and file. */
+}
+
+// ELF32 Dynamic structure. The ".dynamic" section contains an array of them.
+type Dyn32 struct {
+	Tag int32  /* Entry type. */
+	Val uint32 /* Integer/Address value. */
+}
+
+// ELF32 Compression header.
+type Chdr32 struct {
+	Type      uint32
+	Size      uint32
+	Addralign uint32
+}
+
+/*
+ * Relocation entries.
+ */
+
+// ELF32 Relocations that don't need an addend field.
+type Rel32 struct {
+	Off  uint32 /* Location to be relocated. */
+	Info uint32 /* Relocation type and symbol index. */
+}
+
+// ELF32 Relocations that need an addend field.
+type Rela32 struct {
+	Off    uint32 /* Location to be relocated. */
+	Info   uint32 /* Relocation type and symbol index. */
+	Addend int32  /* Addend. */
+}
+
+func R_SYM32(info uint32) uint32      { return info >> 8 }
+func R_TYPE32(info uint32) uint32     { return info & 0xff }
+func R_INFO32(sym, typ uint32) uint32 { return sym<<8 | typ }
+
+// ELF32 Symbol.
+type Sym32 struct {
+	Name  uint32
+	Value uint32
+	Size  uint32
+	Info  uint8
+	Other uint8
+	Shndx uint16
+}
+
+const Sym32Size = 16
+
+func ST_BIND(info uint8) SymBind { return SymBind(info >> 4) }
+func ST_TYPE(info uint8) SymType { return SymType(info & 0xF) }
+func ST_INFO(bind SymBind, typ SymType) uint8 {
+	return uint8(bind)<<4 | uint8(typ)&0xf
+}
+func ST_VISIBILITY(other uint8) SymVis { return SymVis(other & 3) }
+
+/*
+ * ELF64
+ */
+
+// ELF64 file header.
+type Header64 struct {
+	Ident     [EI_NIDENT]byte /* File identification. */
+	Type      uint16          /* File type. */
+	Machine   uint16          /* Machine architecture. */
+	Version   uint32          /* ELF format version. */
+	Entry     uint64          /* Entry point. */
+	Phoff     uint64          /* Program header file offset. */
+	Shoff     uint64          /* Section header file offset. */
+	Flags     uint32          /* Architecture-specific flags. */
+	Ehsize    uint16          /* Size of ELF header in bytes. */
+	Phentsize uint16          /* Size of program header entry. */
+	Phnum     uint16          /* Number of program header entries. */
+	Shentsize uint16          /* Size of section header entry. */
+	Shnum     uint16          /* Number of section header entries. */
+	Shstrndx  uint16          /* Section name strings section. */
+}
+
+// ELF64 Section header.
+type Section64 struct {
+	Name      uint32 /* Section name (index into the section header string table). */
+	Type      uint32 /* Section type. */
+	Flags     uint64 /* Section flags. */
+	Addr      uint64 /* Address in memory image. */
+	Off       uint64 /* Offset in file. */
+	Size      uint64 /* Size in bytes. */
+	Link      uint32 /* Index of a related section. */
+	Info      uint32 /* Depends on section type. */
+	Addralign uint64 /* Alignment in bytes. */
+	Entsize   uint64 /* Size of each entry in section. */
+}
+
+// ELF64 Program header.
+type Prog64 struct {
+	Type   uint32 /* Entry type. */
+	Flags  uint32 /* Access permission flags. */
+	Off    uint64 /* File offset of contents. */
+	Vaddr  uint64 /* Virtual address in memory image. */
+	Paddr  uint64 /* Physical address (not used). */
+	Filesz uint64 /* Size of contents in file. */
+	Memsz  uint64 /* Size of contents in memory. */
+	Align  uint64 /* Alignment in memory and file. */
+}
+
+// ELF64 Dynamic structure. The ".dynamic" section contains an array of them.
+type Dyn64 struct {
+	Tag int64  /* Entry type. */
+	Val uint64 /* Integer/address value */
+}
+
+// ELF64 Compression header.
+type Chdr64 struct {
+	Type      uint32
+	_         uint32 /* Reserved. */
+	Size      uint64
+	Addralign uint64
+}
+
+/*
+ * Relocation entries.
+ */
+
+/* ELF64 relocations that don't need an addend field. */
+type Rel64 struct {
+	Off  uint64 /* Location to be relocated. */
+	Info uint64 /* Relocation type and symbol index. */
+}
+
+/* ELF64 relocations that need an addend field. */
+type Rela64 struct {
+	Off    uint64 /* Location to be relocated. */
+	Info   uint64 /* Relocation type and symbol index. */
+	Addend int64  /* Addend. */
+}
+
+func R_SYM64(info uint64) uint32    { return uint32(info >> 32) }
+func R_TYPE64(info uint64) uint32   { return uint32(info) }
+func R_INFO(sym, typ uint32) uint64 { return uint64(sym)<<32 | uint64(typ) }
+
+// ELF64 symbol table entries.
+type Sym64 struct {
+	Name  uint32 /* String table index of name. */
+	Info  uint8  /* Type and binding information. */
+	Other uint8  /* Reserved (not used). */
+	Shndx uint16 /* Section index of symbol. */
+	Value uint64 /* Symbol value. */
+	Size  uint64 /* Size of associated object. */
+}
+
+const Sym64Size = 24
+
+type intName struct {
+	i uint32
+	s string
+}
+
+func stringName(i uint32, names []intName, goSyntax bool) string {
+	for _, n := range names {
+		if n.i == i {
+			if goSyntax {
+				return "elf." + n.s
+			}
+			return n.s
+		}
+	}
+
+	// second pass - look for smaller to add with.
+	// assume sorted already
+	for j := len(names) - 1; j >= 0; j-- {
+		n := names[j]
+		if n.i < i {
+			s := n.s
+			if goSyntax {
+				s = "elf." + s
+			}
+			return s + "+" + strconv.FormatUint(uint64(i-n.i), 10)
+		}
+	}
+
+	return strconv.FormatUint(uint64(i), 10)
+}
+
+func flagName(i uint32, names []intName, goSyntax bool) string {
+	s := ""
+	for _, n := range names {
+		if n.i&i == n.i {
+			if len(s) > 0 {
+				s += "+"
+			}
+			if goSyntax {
+				s += "elf."
+			}
+			s += n.s
+			i -= n.i
+		}
+	}
+	if len(s) == 0 {
+		return "0x" + strconv.FormatUint(uint64(i), 16)
+	}
+	if i != 0 {
+		s += "+0x" + strconv.FormatUint(uint64(i), 16)
+	}
+	return s
+}
diff --git a/src/debug/elf/elf_test.go b/src/debug/elf/elf_test.go
new file mode 100644
index 0000000..f8985a8
--- /dev/null
+++ b/src/debug/elf/elf_test.go
@@ -0,0 +1,49 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package elf
+
+import (
+	"fmt"
+	"testing"
+)
+
+type nameTest struct {
+	val interface{}
+	str string
+}
+
+var nameTests = []nameTest{
+	{ELFOSABI_LINUX, "ELFOSABI_LINUX"},
+	{ET_EXEC, "ET_EXEC"},
+	{EM_860, "EM_860"},
+	{SHN_LOPROC, "SHN_LOPROC"},
+	{SHT_PROGBITS, "SHT_PROGBITS"},
+	{SHF_MERGE + SHF_TLS, "SHF_MERGE+SHF_TLS"},
+	{PT_LOAD, "PT_LOAD"},
+	{PF_W + PF_R + 0x50, "PF_W+PF_R+0x50"},
+	{DT_SYMBOLIC, "DT_SYMBOLIC"},
+	{DF_BIND_NOW, "DF_BIND_NOW"},
+	{NT_FPREGSET, "NT_FPREGSET"},
+	{STB_GLOBAL, "STB_GLOBAL"},
+	{STT_COMMON, "STT_COMMON"},
+	{STV_HIDDEN, "STV_HIDDEN"},
+	{R_X86_64_PC32, "R_X86_64_PC32"},
+	{R_ALPHA_OP_PUSH, "R_ALPHA_OP_PUSH"},
+	{R_ARM_THM_ABS5, "R_ARM_THM_ABS5"},
+	{R_386_GOT32, "R_386_GOT32"},
+	{R_PPC_GOT16_HI, "R_PPC_GOT16_HI"},
+	{R_SPARC_GOT22, "R_SPARC_GOT22"},
+	{ET_LOOS + 5, "ET_LOOS+5"},
+	{ProgFlag(0x50), "0x50"},
+}
+
+func TestNames(t *testing.T) {
+	for i, tt := range nameTests {
+		s := fmt.Sprint(tt.val)
+		if s != tt.str {
+			t.Errorf("#%d: Sprint(%d) = %q, want %q", i, tt.val, s, tt.str)
+		}
+	}
+}
diff --git a/src/debug/elf/file.go b/src/debug/elf/file.go
new file mode 100644
index 0000000..b25d820
--- /dev/null
+++ b/src/debug/elf/file.go
@@ -0,0 +1,1455 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package elf implements access to ELF object files.
+package elf
+
+import (
+	"bytes"
+	"compress/zlib"
+	"debug/dwarf"
+	"encoding/binary"
+	"errors"
+	"fmt"
+	"io"
+	"os"
+	"strings"
+)
+
+// seekStart, seekCurrent, seekEnd are copies of
+// io.SeekStart, io.SeekCurrent, and io.SeekEnd.
+// We can't use the ones from package io because
+// we want this code to build with Go 1.4 during
+// cmd/dist bootstrap.
+const (
+	seekStart   int = 0
+	seekCurrent int = 1
+	seekEnd     int = 2
+)
+
+// TODO: error reporting detail
+
+/*
+ * Internal ELF representation
+ */
+
+// A FileHeader represents an ELF file header.
+type FileHeader struct {
+	Class      Class
+	Data       Data
+	Version    Version
+	OSABI      OSABI
+	ABIVersion uint8
+	ByteOrder  binary.ByteOrder
+	Type       Type
+	Machine    Machine
+	Entry      uint64
+}
+
+// A File represents an open ELF file.
+type File struct {
+	FileHeader
+	Sections  []*Section
+	Progs     []*Prog
+	closer    io.Closer
+	gnuNeed   []verneed
+	gnuVersym []byte
+}
+
+// A SectionHeader represents a single ELF section header.
+type SectionHeader struct {
+	Name      string
+	Type      SectionType
+	Flags     SectionFlag
+	Addr      uint64
+	Offset    uint64
+	Size      uint64
+	Link      uint32
+	Info      uint32
+	Addralign uint64
+	Entsize   uint64
+
+	// FileSize is the size of this section in the file in bytes.
+	// If a section is compressed, FileSize is the size of the
+	// compressed data, while Size (above) is the size of the
+	// uncompressed data.
+	FileSize uint64
+}
+
+// A Section represents a single section in an ELF file.
+type Section struct {
+	SectionHeader
+
+	// Embed ReaderAt for ReadAt method.
+	// Do not embed SectionReader directly
+	// to avoid having Read and Seek.
+	// If a client wants Read and Seek it must use
+	// Open() to avoid fighting over the seek offset
+	// with other clients.
+	//
+	// ReaderAt may be nil if the section is not easily available
+	// in a random-access form. For example, a compressed section
+	// may have a nil ReaderAt.
+	io.ReaderAt
+	sr *io.SectionReader
+
+	compressionType   CompressionType
+	compressionOffset int64
+}
+
+// Data reads and returns the contents of the ELF section.
+// Even if the section is stored compressed in the ELF file,
+// Data returns uncompressed data.
+func (s *Section) Data() ([]byte, error) {
+	dat := make([]byte, s.Size)
+	n, err := io.ReadFull(s.Open(), dat)
+	return dat[0:n], err
+}
+
+// stringTable reads and returns the string table given by the
+// specified link value.
+func (f *File) stringTable(link uint32) ([]byte, error) {
+	if link <= 0 || link >= uint32(len(f.Sections)) {
+		return nil, errors.New("section has invalid string table link")
+	}
+	return f.Sections[link].Data()
+}
+
+// Open returns a new ReadSeeker reading the ELF section.
+// Even if the section is stored compressed in the ELF file,
+// the ReadSeeker reads uncompressed data.
+func (s *Section) Open() io.ReadSeeker {
+	if s.Flags&SHF_COMPRESSED == 0 {
+		return io.NewSectionReader(s.sr, 0, 1<<63-1)
+	}
+	if s.compressionType == COMPRESS_ZLIB {
+		return &readSeekerFromReader{
+			reset: func() (io.Reader, error) {
+				fr := io.NewSectionReader(s.sr, s.compressionOffset, int64(s.FileSize)-s.compressionOffset)
+				return zlib.NewReader(fr)
+			},
+			size: int64(s.Size),
+		}
+	}
+	err := &FormatError{int64(s.Offset), "unknown compression type", s.compressionType}
+	return errorReader{err}
+}
+
+// A ProgHeader represents a single ELF program header.
+type ProgHeader struct {
+	Type   ProgType
+	Flags  ProgFlag
+	Off    uint64
+	Vaddr  uint64
+	Paddr  uint64
+	Filesz uint64
+	Memsz  uint64
+	Align  uint64
+}
+
+// A Prog represents a single ELF program header in an ELF binary.
+type Prog struct {
+	ProgHeader
+
+	// Embed ReaderAt for ReadAt method.
+	// Do not embed SectionReader directly
+	// to avoid having Read and Seek.
+	// If a client wants Read and Seek it must use
+	// Open() to avoid fighting over the seek offset
+	// with other clients.
+	io.ReaderAt
+	sr *io.SectionReader
+}
+
+// Open returns a new ReadSeeker reading the ELF program body.
+func (p *Prog) Open() io.ReadSeeker { return io.NewSectionReader(p.sr, 0, 1<<63-1) }
+
+// A Symbol represents an entry in an ELF symbol table section.
+type Symbol struct {
+	Name        string
+	Info, Other byte
+	Section     SectionIndex
+	Value, Size uint64
+
+	// Version and Library are present only for the dynamic symbol
+	// table.
+	Version string
+	Library string
+}
+
+/*
+ * ELF reader
+ */
+
+type FormatError struct {
+	off int64
+	msg string
+	val interface{}
+}
+
+func (e *FormatError) Error() string {
+	msg := e.msg
+	if e.val != nil {
+		msg += fmt.Sprintf(" '%v' ", e.val)
+	}
+	msg += fmt.Sprintf("in record at byte %#x", e.off)
+	return msg
+}
+
+// Open opens the named file using os.Open and prepares it for use as an ELF binary.
+func Open(name string) (*File, error) {
+	f, err := os.Open(name)
+	if err != nil {
+		return nil, err
+	}
+	ff, err := NewFile(f)
+	if err != nil {
+		f.Close()
+		return nil, err
+	}
+	ff.closer = f
+	return ff, nil
+}
+
+// Close closes the File.
+// If the File was created using NewFile directly instead of Open,
+// Close has no effect.
+func (f *File) Close() error {
+	var err error
+	if f.closer != nil {
+		err = f.closer.Close()
+		f.closer = nil
+	}
+	return err
+}
+
+// SectionByType returns the first section in f with the
+// given type, or nil if there is no such section.
+func (f *File) SectionByType(typ SectionType) *Section {
+	for _, s := range f.Sections {
+		if s.Type == typ {
+			return s
+		}
+	}
+	return nil
+}
+
+// NewFile creates a new File for accessing an ELF binary in an underlying reader.
+// The ELF binary is expected to start at position 0 in the ReaderAt.
+func NewFile(r io.ReaderAt) (*File, error) {
+	sr := io.NewSectionReader(r, 0, 1<<63-1)
+	// Read and decode ELF identifier
+	var ident [16]uint8
+	if _, err := r.ReadAt(ident[0:], 0); err != nil {
+		return nil, err
+	}
+	if ident[0] != '\x7f' || ident[1] != 'E' || ident[2] != 'L' || ident[3] != 'F' {
+		return nil, &FormatError{0, "bad magic number", ident[0:4]}
+	}
+
+	f := new(File)
+	f.Class = Class(ident[EI_CLASS])
+	switch f.Class {
+	case ELFCLASS32:
+	case ELFCLASS64:
+		// ok
+	default:
+		return nil, &FormatError{0, "unknown ELF class", f.Class}
+	}
+
+	f.Data = Data(ident[EI_DATA])
+	switch f.Data {
+	case ELFDATA2LSB:
+		f.ByteOrder = binary.LittleEndian
+	case ELFDATA2MSB:
+		f.ByteOrder = binary.BigEndian
+	default:
+		return nil, &FormatError{0, "unknown ELF data encoding", f.Data}
+	}
+
+	f.Version = Version(ident[EI_VERSION])
+	if f.Version != EV_CURRENT {
+		return nil, &FormatError{0, "unknown ELF version", f.Version}
+	}
+
+	f.OSABI = OSABI(ident[EI_OSABI])
+	f.ABIVersion = ident[EI_ABIVERSION]
+
+	// Read ELF file header
+	var phoff int64
+	var phentsize, phnum int
+	var shoff int64
+	var shentsize, shnum, shstrndx int
+	switch f.Class {
+	case ELFCLASS32:
+		hdr := new(Header32)
+		sr.Seek(0, seekStart)
+		if err := binary.Read(sr, f.ByteOrder, hdr); err != nil {
+			return nil, err
+		}
+		f.Type = Type(hdr.Type)
+		f.Machine = Machine(hdr.Machine)
+		f.Entry = uint64(hdr.Entry)
+		if v := Version(hdr.Version); v != f.Version {
+			return nil, &FormatError{0, "mismatched ELF version", v}
+		}
+		phoff = int64(hdr.Phoff)
+		phentsize = int(hdr.Phentsize)
+		phnum = int(hdr.Phnum)
+		shoff = int64(hdr.Shoff)
+		shentsize = int(hdr.Shentsize)
+		shnum = int(hdr.Shnum)
+		shstrndx = int(hdr.Shstrndx)
+	case ELFCLASS64:
+		hdr := new(Header64)
+		sr.Seek(0, seekStart)
+		if err := binary.Read(sr, f.ByteOrder, hdr); err != nil {
+			return nil, err
+		}
+		f.Type = Type(hdr.Type)
+		f.Machine = Machine(hdr.Machine)
+		f.Entry = hdr.Entry
+		if v := Version(hdr.Version); v != f.Version {
+			return nil, &FormatError{0, "mismatched ELF version", v}
+		}
+		phoff = int64(hdr.Phoff)
+		phentsize = int(hdr.Phentsize)
+		phnum = int(hdr.Phnum)
+		shoff = int64(hdr.Shoff)
+		shentsize = int(hdr.Shentsize)
+		shnum = int(hdr.Shnum)
+		shstrndx = int(hdr.Shstrndx)
+	}
+
+	if shoff == 0 && shnum != 0 {
+		return nil, &FormatError{0, "invalid ELF shnum for shoff=0", shnum}
+	}
+
+	if shnum > 0 && shstrndx >= shnum {
+		return nil, &FormatError{0, "invalid ELF shstrndx", shstrndx}
+	}
+
+	// Read program headers
+	f.Progs = make([]*Prog, phnum)
+	for i := 0; i < phnum; i++ {
+		off := phoff + int64(i)*int64(phentsize)
+		sr.Seek(off, seekStart)
+		p := new(Prog)
+		switch f.Class {
+		case ELFCLASS32:
+			ph := new(Prog32)
+			if err := binary.Read(sr, f.ByteOrder, ph); err != nil {
+				return nil, err
+			}
+			p.ProgHeader = ProgHeader{
+				Type:   ProgType(ph.Type),
+				Flags:  ProgFlag(ph.Flags),
+				Off:    uint64(ph.Off),
+				Vaddr:  uint64(ph.Vaddr),
+				Paddr:  uint64(ph.Paddr),
+				Filesz: uint64(ph.Filesz),
+				Memsz:  uint64(ph.Memsz),
+				Align:  uint64(ph.Align),
+			}
+		case ELFCLASS64:
+			ph := new(Prog64)
+			if err := binary.Read(sr, f.ByteOrder, ph); err != nil {
+				return nil, err
+			}
+			p.ProgHeader = ProgHeader{
+				Type:   ProgType(ph.Type),
+				Flags:  ProgFlag(ph.Flags),
+				Off:    ph.Off,
+				Vaddr:  ph.Vaddr,
+				Paddr:  ph.Paddr,
+				Filesz: ph.Filesz,
+				Memsz:  ph.Memsz,
+				Align:  ph.Align,
+			}
+		}
+		p.sr = io.NewSectionReader(r, int64(p.Off), int64(p.Filesz))
+		p.ReaderAt = p.sr
+		f.Progs[i] = p
+	}
+
+	// Read section headers
+	f.Sections = make([]*Section, shnum)
+	names := make([]uint32, shnum)
+	for i := 0; i < shnum; i++ {
+		off := shoff + int64(i)*int64(shentsize)
+		sr.Seek(off, seekStart)
+		s := new(Section)
+		switch f.Class {
+		case ELFCLASS32:
+			sh := new(Section32)
+			if err := binary.Read(sr, f.ByteOrder, sh); err != nil {
+				return nil, err
+			}
+			names[i] = sh.Name
+			s.SectionHeader = SectionHeader{
+				Type:      SectionType(sh.Type),
+				Flags:     SectionFlag(sh.Flags),
+				Addr:      uint64(sh.Addr),
+				Offset:    uint64(sh.Off),
+				FileSize:  uint64(sh.Size),
+				Link:      sh.Link,
+				Info:      sh.Info,
+				Addralign: uint64(sh.Addralign),
+				Entsize:   uint64(sh.Entsize),
+			}
+		case ELFCLASS64:
+			sh := new(Section64)
+			if err := binary.Read(sr, f.ByteOrder, sh); err != nil {
+				return nil, err
+			}
+			names[i] = sh.Name
+			s.SectionHeader = SectionHeader{
+				Type:      SectionType(sh.Type),
+				Flags:     SectionFlag(sh.Flags),
+				Offset:    sh.Off,
+				FileSize:  sh.Size,
+				Addr:      sh.Addr,
+				Link:      sh.Link,
+				Info:      sh.Info,
+				Addralign: sh.Addralign,
+				Entsize:   sh.Entsize,
+			}
+		}
+		s.sr = io.NewSectionReader(r, int64(s.Offset), int64(s.FileSize))
+
+		if s.Flags&SHF_COMPRESSED == 0 {
+			s.ReaderAt = s.sr
+			s.Size = s.FileSize
+		} else {
+			// Read the compression header.
+			switch f.Class {
+			case ELFCLASS32:
+				ch := new(Chdr32)
+				if err := binary.Read(s.sr, f.ByteOrder, ch); err != nil {
+					return nil, err
+				}
+				s.compressionType = CompressionType(ch.Type)
+				s.Size = uint64(ch.Size)
+				s.Addralign = uint64(ch.Addralign)
+				s.compressionOffset = int64(binary.Size(ch))
+			case ELFCLASS64:
+				ch := new(Chdr64)
+				if err := binary.Read(s.sr, f.ByteOrder, ch); err != nil {
+					return nil, err
+				}
+				s.compressionType = CompressionType(ch.Type)
+				s.Size = ch.Size
+				s.Addralign = ch.Addralign
+				s.compressionOffset = int64(binary.Size(ch))
+			}
+		}
+
+		f.Sections[i] = s
+	}
+
+	if len(f.Sections) == 0 {
+		return f, nil
+	}
+
+	// Load section header string table.
+	shstrtab, err := f.Sections[shstrndx].Data()
+	if err != nil {
+		return nil, err
+	}
+	for i, s := range f.Sections {
+		var ok bool
+		s.Name, ok = getString(shstrtab, int(names[i]))
+		if !ok {
+			return nil, &FormatError{shoff + int64(i*shentsize), "bad section name index", names[i]}
+		}
+	}
+
+	return f, nil
+}
+
+// getSymbols returns a slice of Symbols from parsing the symbol table
+// with the given type, along with the associated string table.
+func (f *File) getSymbols(typ SectionType) ([]Symbol, []byte, error) {
+	switch f.Class {
+	case ELFCLASS64:
+		return f.getSymbols64(typ)
+
+	case ELFCLASS32:
+		return f.getSymbols32(typ)
+	}
+
+	return nil, nil, errors.New("not implemented")
+}
+
+// ErrNoSymbols is returned by File.Symbols and File.DynamicSymbols
+// if there is no such section in the File.
+var ErrNoSymbols = errors.New("no symbol section")
+
+func (f *File) getSymbols32(typ SectionType) ([]Symbol, []byte, error) {
+	symtabSection := f.SectionByType(typ)
+	if symtabSection == nil {
+		return nil, nil, ErrNoSymbols
+	}
+
+	data, err := symtabSection.Data()
+	if err != nil {
+		return nil, nil, errors.New("cannot load symbol section")
+	}
+	symtab := bytes.NewReader(data)
+	if symtab.Len()%Sym32Size != 0 {
+		return nil, nil, errors.New("length of symbol section is not a multiple of SymSize")
+	}
+
+	strdata, err := f.stringTable(symtabSection.Link)
+	if err != nil {
+		return nil, nil, errors.New("cannot load string table section")
+	}
+
+	// The first entry is all zeros.
+	var skip [Sym32Size]byte
+	symtab.Read(skip[:])
+
+	symbols := make([]Symbol, symtab.Len()/Sym32Size)
+
+	i := 0
+	var sym Sym32
+	for symtab.Len() > 0 {
+		binary.Read(symtab, f.ByteOrder, &sym)
+		str, _ := getString(strdata, int(sym.Name))
+		symbols[i].Name = str
+		symbols[i].Info = sym.Info
+		symbols[i].Other = sym.Other
+		symbols[i].Section = SectionIndex(sym.Shndx)
+		symbols[i].Value = uint64(sym.Value)
+		symbols[i].Size = uint64(sym.Size)
+		i++
+	}
+
+	return symbols, strdata, nil
+}
+
+func (f *File) getSymbols64(typ SectionType) ([]Symbol, []byte, error) {
+	symtabSection := f.SectionByType(typ)
+	if symtabSection == nil {
+		return nil, nil, ErrNoSymbols
+	}
+
+	data, err := symtabSection.Data()
+	if err != nil {
+		return nil, nil, errors.New("cannot load symbol section")
+	}
+	symtab := bytes.NewReader(data)
+	if symtab.Len()%Sym64Size != 0 {
+		return nil, nil, errors.New("length of symbol section is not a multiple of Sym64Size")
+	}
+
+	strdata, err := f.stringTable(symtabSection.Link)
+	if err != nil {
+		return nil, nil, errors.New("cannot load string table section")
+	}
+
+	// The first entry is all zeros.
+	var skip [Sym64Size]byte
+	symtab.Read(skip[:])
+
+	symbols := make([]Symbol, symtab.Len()/Sym64Size)
+
+	i := 0
+	var sym Sym64
+	for symtab.Len() > 0 {
+		binary.Read(symtab, f.ByteOrder, &sym)
+		str, _ := getString(strdata, int(sym.Name))
+		symbols[i].Name = str
+		symbols[i].Info = sym.Info
+		symbols[i].Other = sym.Other
+		symbols[i].Section = SectionIndex(sym.Shndx)
+		symbols[i].Value = sym.Value
+		symbols[i].Size = sym.Size
+		i++
+	}
+
+	return symbols, strdata, nil
+}
+
+// getString extracts a string from an ELF string table.
+func getString(section []byte, start int) (string, bool) {
+	if start < 0 || start >= len(section) {
+		return "", false
+	}
+
+	for end := start; end < len(section); end++ {
+		if section[end] == 0 {
+			return string(section[start:end]), true
+		}
+	}
+	return "", false
+}
+
+// Section returns a section with the given name, or nil if no such
+// section exists.
+func (f *File) Section(name string) *Section {
+	for _, s := range f.Sections {
+		if s.Name == name {
+			return s
+		}
+	}
+	return nil
+}
+
+// applyRelocations applies relocations to dst. rels is a relocations section
+// in REL or RELA format.
+func (f *File) applyRelocations(dst []byte, rels []byte) error {
+	switch {
+	case f.Class == ELFCLASS64 && f.Machine == EM_X86_64:
+		return f.applyRelocationsAMD64(dst, rels)
+	case f.Class == ELFCLASS32 && f.Machine == EM_386:
+		return f.applyRelocations386(dst, rels)
+	case f.Class == ELFCLASS32 && f.Machine == EM_ARM:
+		return f.applyRelocationsARM(dst, rels)
+	case f.Class == ELFCLASS64 && f.Machine == EM_AARCH64:
+		return f.applyRelocationsARM64(dst, rels)
+	case f.Class == ELFCLASS32 && f.Machine == EM_PPC:
+		return f.applyRelocationsPPC(dst, rels)
+	case f.Class == ELFCLASS64 && f.Machine == EM_PPC64:
+		return f.applyRelocationsPPC64(dst, rels)
+	case f.Class == ELFCLASS32 && f.Machine == EM_MIPS:
+		return f.applyRelocationsMIPS(dst, rels)
+	case f.Class == ELFCLASS64 && f.Machine == EM_MIPS:
+		return f.applyRelocationsMIPS64(dst, rels)
+	case f.Class == ELFCLASS64 && f.Machine == EM_RISCV:
+		return f.applyRelocationsRISCV64(dst, rels)
+	case f.Class == ELFCLASS64 && f.Machine == EM_S390:
+		return f.applyRelocationss390x(dst, rels)
+	case f.Class == ELFCLASS64 && f.Machine == EM_SPARCV9:
+		return f.applyRelocationsSPARC64(dst, rels)
+	default:
+		return errors.New("applyRelocations: not implemented")
+	}
+}
+
+// canApplyRelocation reports whether we should try to apply a
+// relocation to a DWARF data section, given a pointer to the symbol
+// targeted by the relocation.
+// Most relocations in DWARF data tend to be section-relative, but
+// some target non-section symbols (for example, low_PC attrs on
+// subprogram or compilation unit DIEs that target function symbols).
+func canApplyRelocation(sym *Symbol) bool {
+	return sym.Section != SHN_UNDEF && sym.Section < SHN_LORESERVE
+}
+
+func (f *File) applyRelocationsAMD64(dst []byte, rels []byte) error {
+	// 24 is the size of Rela64.
+	if len(rels)%24 != 0 {
+		return errors.New("length of relocation section is not a multiple of 24")
+	}
+
+	symbols, _, err := f.getSymbols(SHT_SYMTAB)
+	if err != nil {
+		return err
+	}
+
+	b := bytes.NewReader(rels)
+	var rela Rela64
+
+	for b.Len() > 0 {
+		binary.Read(b, f.ByteOrder, &rela)
+		symNo := rela.Info >> 32
+		t := R_X86_64(rela.Info & 0xffff)
+
+		if symNo == 0 || symNo > uint64(len(symbols)) {
+			continue
+		}
+		sym := &symbols[symNo-1]
+		if !canApplyRelocation(sym) {
+			continue
+		}
+
+		// There are relocations, so this must be a normal
+		// object file.  The code below handles only basic relocations
+		// of the form S + A (symbol plus addend).
+
+		switch t {
+		case R_X86_64_64:
+			if rela.Off+8 >= uint64(len(dst)) || rela.Addend < 0 {
+				continue
+			}
+			val64 := sym.Value + uint64(rela.Addend)
+			f.ByteOrder.PutUint64(dst[rela.Off:rela.Off+8], val64)
+		case R_X86_64_32:
+			if rela.Off+4 >= uint64(len(dst)) || rela.Addend < 0 {
+				continue
+			}
+			val32 := uint32(sym.Value) + uint32(rela.Addend)
+			f.ByteOrder.PutUint32(dst[rela.Off:rela.Off+4], val32)
+		}
+	}
+
+	return nil
+}
+
+func (f *File) applyRelocations386(dst []byte, rels []byte) error {
+	// 8 is the size of Rel32.
+	if len(rels)%8 != 0 {
+		return errors.New("length of relocation section is not a multiple of 8")
+	}
+
+	symbols, _, err := f.getSymbols(SHT_SYMTAB)
+	if err != nil {
+		return err
+	}
+
+	b := bytes.NewReader(rels)
+	var rel Rel32
+
+	for b.Len() > 0 {
+		binary.Read(b, f.ByteOrder, &rel)
+		symNo := rel.Info >> 8
+		t := R_386(rel.Info & 0xff)
+
+		if symNo == 0 || symNo > uint32(len(symbols)) {
+			continue
+		}
+		sym := &symbols[symNo-1]
+
+		if t == R_386_32 {
+			if rel.Off+4 >= uint32(len(dst)) {
+				continue
+			}
+			val := f.ByteOrder.Uint32(dst[rel.Off : rel.Off+4])
+			val += uint32(sym.Value)
+			f.ByteOrder.PutUint32(dst[rel.Off:rel.Off+4], val)
+		}
+	}
+
+	return nil
+}
+
+func (f *File) applyRelocationsARM(dst []byte, rels []byte) error {
+	// 8 is the size of Rel32.
+	if len(rels)%8 != 0 {
+		return errors.New("length of relocation section is not a multiple of 8")
+	}
+
+	symbols, _, err := f.getSymbols(SHT_SYMTAB)
+	if err != nil {
+		return err
+	}
+
+	b := bytes.NewReader(rels)
+	var rel Rel32
+
+	for b.Len() > 0 {
+		binary.Read(b, f.ByteOrder, &rel)
+		symNo := rel.Info >> 8
+		t := R_ARM(rel.Info & 0xff)
+
+		if symNo == 0 || symNo > uint32(len(symbols)) {
+			continue
+		}
+		sym := &symbols[symNo-1]
+
+		switch t {
+		case R_ARM_ABS32:
+			if rel.Off+4 >= uint32(len(dst)) {
+				continue
+			}
+			val := f.ByteOrder.Uint32(dst[rel.Off : rel.Off+4])
+			val += uint32(sym.Value)
+			f.ByteOrder.PutUint32(dst[rel.Off:rel.Off+4], val)
+		}
+	}
+
+	return nil
+}
+
+func (f *File) applyRelocationsARM64(dst []byte, rels []byte) error {
+	// 24 is the size of Rela64.
+	if len(rels)%24 != 0 {
+		return errors.New("length of relocation section is not a multiple of 24")
+	}
+
+	symbols, _, err := f.getSymbols(SHT_SYMTAB)
+	if err != nil {
+		return err
+	}
+
+	b := bytes.NewReader(rels)
+	var rela Rela64
+
+	for b.Len() > 0 {
+		binary.Read(b, f.ByteOrder, &rela)
+		symNo := rela.Info >> 32
+		t := R_AARCH64(rela.Info & 0xffff)
+
+		if symNo == 0 || symNo > uint64(len(symbols)) {
+			continue
+		}
+		sym := &symbols[symNo-1]
+		if !canApplyRelocation(sym) {
+			continue
+		}
+
+		// There are relocations, so this must be a normal
+		// object file.  The code below handles only basic relocations
+		// of the form S + A (symbol plus addend).
+
+		switch t {
+		case R_AARCH64_ABS64:
+			if rela.Off+8 >= uint64(len(dst)) || rela.Addend < 0 {
+				continue
+			}
+			val64 := sym.Value + uint64(rela.Addend)
+			f.ByteOrder.PutUint64(dst[rela.Off:rela.Off+8], val64)
+		case R_AARCH64_ABS32:
+			if rela.Off+4 >= uint64(len(dst)) || rela.Addend < 0 {
+				continue
+			}
+			val32 := uint32(sym.Value) + uint32(rela.Addend)
+			f.ByteOrder.PutUint32(dst[rela.Off:rela.Off+4], val32)
+		}
+	}
+
+	return nil
+}
+
+func (f *File) applyRelocationsPPC(dst []byte, rels []byte) error {
+	// 12 is the size of Rela32.
+	if len(rels)%12 != 0 {
+		return errors.New("length of relocation section is not a multiple of 12")
+	}
+
+	symbols, _, err := f.getSymbols(SHT_SYMTAB)
+	if err != nil {
+		return err
+	}
+
+	b := bytes.NewReader(rels)
+	var rela Rela32
+
+	for b.Len() > 0 {
+		binary.Read(b, f.ByteOrder, &rela)
+		symNo := rela.Info >> 8
+		t := R_PPC(rela.Info & 0xff)
+
+		if symNo == 0 || symNo > uint32(len(symbols)) {
+			continue
+		}
+		sym := &symbols[symNo-1]
+		if !canApplyRelocation(sym) {
+			continue
+		}
+
+		switch t {
+		case R_PPC_ADDR32:
+			if rela.Off+4 >= uint32(len(dst)) || rela.Addend < 0 {
+				continue
+			}
+			val32 := uint32(sym.Value) + uint32(rela.Addend)
+			f.ByteOrder.PutUint32(dst[rela.Off:rela.Off+4], val32)
+		}
+	}
+
+	return nil
+}
+
+func (f *File) applyRelocationsPPC64(dst []byte, rels []byte) error {
+	// 24 is the size of Rela64.
+	if len(rels)%24 != 0 {
+		return errors.New("length of relocation section is not a multiple of 24")
+	}
+
+	symbols, _, err := f.getSymbols(SHT_SYMTAB)
+	if err != nil {
+		return err
+	}
+
+	b := bytes.NewReader(rels)
+	var rela Rela64
+
+	for b.Len() > 0 {
+		binary.Read(b, f.ByteOrder, &rela)
+		symNo := rela.Info >> 32
+		t := R_PPC64(rela.Info & 0xffff)
+
+		if symNo == 0 || symNo > uint64(len(symbols)) {
+			continue
+		}
+		sym := &symbols[symNo-1]
+		if !canApplyRelocation(sym) {
+			continue
+		}
+
+		switch t {
+		case R_PPC64_ADDR64:
+			if rela.Off+8 >= uint64(len(dst)) || rela.Addend < 0 {
+				continue
+			}
+			val64 := sym.Value + uint64(rela.Addend)
+			f.ByteOrder.PutUint64(dst[rela.Off:rela.Off+8], val64)
+		case R_PPC64_ADDR32:
+			if rela.Off+4 >= uint64(len(dst)) || rela.Addend < 0 {
+				continue
+			}
+			val32 := uint32(sym.Value) + uint32(rela.Addend)
+			f.ByteOrder.PutUint32(dst[rela.Off:rela.Off+4], val32)
+		}
+	}
+
+	return nil
+}
+
+func (f *File) applyRelocationsMIPS(dst []byte, rels []byte) error {
+	// 8 is the size of Rel32.
+	if len(rels)%8 != 0 {
+		return errors.New("length of relocation section is not a multiple of 8")
+	}
+
+	symbols, _, err := f.getSymbols(SHT_SYMTAB)
+	if err != nil {
+		return err
+	}
+
+	b := bytes.NewReader(rels)
+	var rel Rel32
+
+	for b.Len() > 0 {
+		binary.Read(b, f.ByteOrder, &rel)
+		symNo := rel.Info >> 8
+		t := R_MIPS(rel.Info & 0xff)
+
+		if symNo == 0 || symNo > uint32(len(symbols)) {
+			continue
+		}
+		sym := &symbols[symNo-1]
+
+		switch t {
+		case R_MIPS_32:
+			if rel.Off+4 >= uint32(len(dst)) {
+				continue
+			}
+			val := f.ByteOrder.Uint32(dst[rel.Off : rel.Off+4])
+			val += uint32(sym.Value)
+			f.ByteOrder.PutUint32(dst[rel.Off:rel.Off+4], val)
+		}
+	}
+
+	return nil
+}
+
+func (f *File) applyRelocationsMIPS64(dst []byte, rels []byte) error {
+	// 24 is the size of Rela64.
+	if len(rels)%24 != 0 {
+		return errors.New("length of relocation section is not a multiple of 24")
+	}
+
+	symbols, _, err := f.getSymbols(SHT_SYMTAB)
+	if err != nil {
+		return err
+	}
+
+	b := bytes.NewReader(rels)
+	var rela Rela64
+
+	for b.Len() > 0 {
+		binary.Read(b, f.ByteOrder, &rela)
+		var symNo uint64
+		var t R_MIPS
+		if f.ByteOrder == binary.BigEndian {
+			symNo = rela.Info >> 32
+			t = R_MIPS(rela.Info & 0xff)
+		} else {
+			symNo = rela.Info & 0xffffffff
+			t = R_MIPS(rela.Info >> 56)
+		}
+
+		if symNo == 0 || symNo > uint64(len(symbols)) {
+			continue
+		}
+		sym := &symbols[symNo-1]
+		if !canApplyRelocation(sym) {
+			continue
+		}
+
+		switch t {
+		case R_MIPS_64:
+			if rela.Off+8 >= uint64(len(dst)) || rela.Addend < 0 {
+				continue
+			}
+			val64 := sym.Value + uint64(rela.Addend)
+			f.ByteOrder.PutUint64(dst[rela.Off:rela.Off+8], val64)
+		case R_MIPS_32:
+			if rela.Off+4 >= uint64(len(dst)) || rela.Addend < 0 {
+				continue
+			}
+			val32 := uint32(sym.Value) + uint32(rela.Addend)
+			f.ByteOrder.PutUint32(dst[rela.Off:rela.Off+4], val32)
+		}
+	}
+
+	return nil
+}
+
+func (f *File) applyRelocationsRISCV64(dst []byte, rels []byte) error {
+	// 24 is the size of Rela64.
+	if len(rels)%24 != 0 {
+		return errors.New("length of relocation section is not a multiple of 24")
+	}
+
+	symbols, _, err := f.getSymbols(SHT_SYMTAB)
+	if err != nil {
+		return err
+	}
+
+	b := bytes.NewReader(rels)
+	var rela Rela64
+
+	for b.Len() > 0 {
+		binary.Read(b, f.ByteOrder, &rela)
+		symNo := rela.Info >> 32
+		t := R_RISCV(rela.Info & 0xffff)
+
+		if symNo == 0 || symNo > uint64(len(symbols)) {
+			continue
+		}
+		sym := &symbols[symNo-1]
+		if !canApplyRelocation(sym) {
+			continue
+		}
+
+		switch t {
+		case R_RISCV_64:
+			if rela.Off+8 >= uint64(len(dst)) || rela.Addend < 0 {
+				continue
+			}
+			val64 := sym.Value + uint64(rela.Addend)
+			f.ByteOrder.PutUint64(dst[rela.Off:rela.Off+8], val64)
+		case R_RISCV_32:
+			if rela.Off+4 >= uint64(len(dst)) || rela.Addend < 0 {
+				continue
+			}
+			val32 := uint32(sym.Value) + uint32(rela.Addend)
+			f.ByteOrder.PutUint32(dst[rela.Off:rela.Off+4], val32)
+		}
+	}
+
+	return nil
+}
+
+func (f *File) applyRelocationss390x(dst []byte, rels []byte) error {
+	// 24 is the size of Rela64.
+	if len(rels)%24 != 0 {
+		return errors.New("length of relocation section is not a multiple of 24")
+	}
+
+	symbols, _, err := f.getSymbols(SHT_SYMTAB)
+	if err != nil {
+		return err
+	}
+
+	b := bytes.NewReader(rels)
+	var rela Rela64
+
+	for b.Len() > 0 {
+		binary.Read(b, f.ByteOrder, &rela)
+		symNo := rela.Info >> 32
+		t := R_390(rela.Info & 0xffff)
+
+		if symNo == 0 || symNo > uint64(len(symbols)) {
+			continue
+		}
+		sym := &symbols[symNo-1]
+		if !canApplyRelocation(sym) {
+			continue
+		}
+
+		switch t {
+		case R_390_64:
+			if rela.Off+8 >= uint64(len(dst)) || rela.Addend < 0 {
+				continue
+			}
+			val64 := sym.Value + uint64(rela.Addend)
+			f.ByteOrder.PutUint64(dst[rela.Off:rela.Off+8], val64)
+		case R_390_32:
+			if rela.Off+4 >= uint64(len(dst)) || rela.Addend < 0 {
+				continue
+			}
+			val32 := uint32(sym.Value) + uint32(rela.Addend)
+			f.ByteOrder.PutUint32(dst[rela.Off:rela.Off+4], val32)
+		}
+	}
+
+	return nil
+}
+
+func (f *File) applyRelocationsSPARC64(dst []byte, rels []byte) error {
+	// 24 is the size of Rela64.
+	if len(rels)%24 != 0 {
+		return errors.New("length of relocation section is not a multiple of 24")
+	}
+
+	symbols, _, err := f.getSymbols(SHT_SYMTAB)
+	if err != nil {
+		return err
+	}
+
+	b := bytes.NewReader(rels)
+	var rela Rela64
+
+	for b.Len() > 0 {
+		binary.Read(b, f.ByteOrder, &rela)
+		symNo := rela.Info >> 32
+		t := R_SPARC(rela.Info & 0xff)
+
+		if symNo == 0 || symNo > uint64(len(symbols)) {
+			continue
+		}
+		sym := &symbols[symNo-1]
+		if !canApplyRelocation(sym) {
+			continue
+		}
+
+		switch t {
+		case R_SPARC_64, R_SPARC_UA64:
+			if rela.Off+8 >= uint64(len(dst)) || rela.Addend < 0 {
+				continue
+			}
+			val64 := sym.Value + uint64(rela.Addend)
+			f.ByteOrder.PutUint64(dst[rela.Off:rela.Off+8], val64)
+		case R_SPARC_32, R_SPARC_UA32:
+			if rela.Off+4 >= uint64(len(dst)) || rela.Addend < 0 {
+				continue
+			}
+			val32 := uint32(sym.Value) + uint32(rela.Addend)
+			f.ByteOrder.PutUint32(dst[rela.Off:rela.Off+4], val32)
+		}
+	}
+
+	return nil
+}
+
+func (f *File) DWARF() (*dwarf.Data, error) {
+	dwarfSuffix := func(s *Section) string {
+		switch {
+		case strings.HasPrefix(s.Name, ".debug_"):
+			return s.Name[7:]
+		case strings.HasPrefix(s.Name, ".zdebug_"):
+			return s.Name[8:]
+		default:
+			return ""
+		}
+
+	}
+	// sectionData gets the data for s, checks its size, and
+	// applies any applicable relations.
+	sectionData := func(i int, s *Section) ([]byte, error) {
+		b, err := s.Data()
+		if err != nil && uint64(len(b)) < s.Size {
+			return nil, err
+		}
+
+		if len(b) >= 12 && string(b[:4]) == "ZLIB" {
+			dlen := binary.BigEndian.Uint64(b[4:12])
+			dbuf := make([]byte, dlen)
+			r, err := zlib.NewReader(bytes.NewBuffer(b[12:]))
+			if err != nil {
+				return nil, err
+			}
+			if _, err := io.ReadFull(r, dbuf); err != nil {
+				return nil, err
+			}
+			if err := r.Close(); err != nil {
+				return nil, err
+			}
+			b = dbuf
+		}
+
+		if f.Type == ET_EXEC {
+			// Do not apply relocations to DWARF sections for ET_EXEC binaries.
+			// Relocations should already be applied, and .rela sections may
+			// contain incorrect data.
+			return b, nil
+		}
+
+		for _, r := range f.Sections {
+			if r.Type != SHT_RELA && r.Type != SHT_REL {
+				continue
+			}
+			if int(r.Info) != i {
+				continue
+			}
+			rd, err := r.Data()
+			if err != nil {
+				return nil, err
+			}
+			err = f.applyRelocations(b, rd)
+			if err != nil {
+				return nil, err
+			}
+		}
+		return b, nil
+	}
+
+	// There are many DWARf sections, but these are the ones
+	// the debug/dwarf package started with.
+	var dat = map[string][]byte{"abbrev": nil, "info": nil, "str": nil, "line": nil, "ranges": nil}
+	for i, s := range f.Sections {
+		suffix := dwarfSuffix(s)
+		if suffix == "" {
+			continue
+		}
+		if _, ok := dat[suffix]; !ok {
+			continue
+		}
+		b, err := sectionData(i, s)
+		if err != nil {
+			return nil, err
+		}
+		dat[suffix] = b
+	}
+
+	d, err := dwarf.New(dat["abbrev"], nil, nil, dat["info"], dat["line"], nil, dat["ranges"], dat["str"])
+	if err != nil {
+		return nil, err
+	}
+
+	// Look for DWARF4 .debug_types sections and DWARF5 sections.
+	for i, s := range f.Sections {
+		suffix := dwarfSuffix(s)
+		if suffix == "" {
+			continue
+		}
+		if _, ok := dat[suffix]; ok {
+			// Already handled.
+			continue
+		}
+
+		b, err := sectionData(i, s)
+		if err != nil {
+			return nil, err
+		}
+
+		if suffix == "types" {
+			if err := d.AddTypes(fmt.Sprintf("types-%d", i), b); err != nil {
+				return nil, err
+			}
+		} else {
+			if err := d.AddSection(".debug_"+suffix, b); err != nil {
+				return nil, err
+			}
+		}
+	}
+
+	return d, nil
+}
+
+// Symbols returns the symbol table for f. The symbols will be listed in the order
+// they appear in f.
+//
+// For compatibility with Go 1.0, Symbols omits the null symbol at index 0.
+// After retrieving the symbols as symtab, an externally supplied index x
+// corresponds to symtab[x-1], not symtab[x].
+func (f *File) Symbols() ([]Symbol, error) {
+	sym, _, err := f.getSymbols(SHT_SYMTAB)
+	return sym, err
+}
+
+// DynamicSymbols returns the dynamic symbol table for f. The symbols
+// will be listed in the order they appear in f.
+//
+// If f has a symbol version table, the returned Symbols will have
+// initialized Version and Library fields.
+//
+// For compatibility with Symbols, DynamicSymbols omits the null symbol at index 0.
+// After retrieving the symbols as symtab, an externally supplied index x
+// corresponds to symtab[x-1], not symtab[x].
+func (f *File) DynamicSymbols() ([]Symbol, error) {
+	sym, str, err := f.getSymbols(SHT_DYNSYM)
+	if err != nil {
+		return nil, err
+	}
+	if f.gnuVersionInit(str) {
+		for i := range sym {
+			sym[i].Library, sym[i].Version = f.gnuVersion(i)
+		}
+	}
+	return sym, nil
+}
+
+type ImportedSymbol struct {
+	Name    string
+	Version string
+	Library string
+}
+
+// ImportedSymbols returns the names of all symbols
+// referred to by the binary f that are expected to be
+// satisfied by other libraries at dynamic load time.
+// It does not return weak symbols.
+func (f *File) ImportedSymbols() ([]ImportedSymbol, error) {
+	sym, str, err := f.getSymbols(SHT_DYNSYM)
+	if err != nil {
+		return nil, err
+	}
+	f.gnuVersionInit(str)
+	var all []ImportedSymbol
+	for i, s := range sym {
+		if ST_BIND(s.Info) == STB_GLOBAL && s.Section == SHN_UNDEF {
+			all = append(all, ImportedSymbol{Name: s.Name})
+			sym := &all[len(all)-1]
+			sym.Library, sym.Version = f.gnuVersion(i)
+		}
+	}
+	return all, nil
+}
+
+type verneed struct {
+	File string
+	Name string
+}
+
+// gnuVersionInit parses the GNU version tables
+// for use by calls to gnuVersion.
+func (f *File) gnuVersionInit(str []byte) bool {
+	if f.gnuNeed != nil {
+		// Already initialized
+		return true
+	}
+
+	// Accumulate verneed information.
+	vn := f.SectionByType(SHT_GNU_VERNEED)
+	if vn == nil {
+		return false
+	}
+	d, _ := vn.Data()
+
+	var need []verneed
+	i := 0
+	for {
+		if i+16 > len(d) {
+			break
+		}
+		vers := f.ByteOrder.Uint16(d[i : i+2])
+		if vers != 1 {
+			break
+		}
+		cnt := f.ByteOrder.Uint16(d[i+2 : i+4])
+		fileoff := f.ByteOrder.Uint32(d[i+4 : i+8])
+		aux := f.ByteOrder.Uint32(d[i+8 : i+12])
+		next := f.ByteOrder.Uint32(d[i+12 : i+16])
+		file, _ := getString(str, int(fileoff))
+
+		var name string
+		j := i + int(aux)
+		for c := 0; c < int(cnt); c++ {
+			if j+16 > len(d) {
+				break
+			}
+			// hash := f.ByteOrder.Uint32(d[j:j+4])
+			// flags := f.ByteOrder.Uint16(d[j+4:j+6])
+			other := f.ByteOrder.Uint16(d[j+6 : j+8])
+			nameoff := f.ByteOrder.Uint32(d[j+8 : j+12])
+			next := f.ByteOrder.Uint32(d[j+12 : j+16])
+			name, _ = getString(str, int(nameoff))
+			ndx := int(other)
+			if ndx >= len(need) {
+				a := make([]verneed, 2*(ndx+1))
+				copy(a, need)
+				need = a
+			}
+
+			need[ndx] = verneed{file, name}
+			if next == 0 {
+				break
+			}
+			j += int(next)
+		}
+
+		if next == 0 {
+			break
+		}
+		i += int(next)
+	}
+
+	// Versym parallels symbol table, indexing into verneed.
+	vs := f.SectionByType(SHT_GNU_VERSYM)
+	if vs == nil {
+		return false
+	}
+	d, _ = vs.Data()
+
+	f.gnuNeed = need
+	f.gnuVersym = d
+	return true
+}
+
+// gnuVersion adds Library and Version information to sym,
+// which came from offset i of the symbol table.
+func (f *File) gnuVersion(i int) (library string, version string) {
+	// Each entry is two bytes.
+	i = (i + 1) * 2
+	if i >= len(f.gnuVersym) {
+		return
+	}
+	j := int(f.ByteOrder.Uint16(f.gnuVersym[i:]))
+	if j < 2 || j >= len(f.gnuNeed) {
+		return
+	}
+	n := &f.gnuNeed[j]
+	return n.File, n.Name
+}
+
+// ImportedLibraries returns the names of all libraries
+// referred to by the binary f that are expected to be
+// linked with the binary at dynamic link time.
+func (f *File) ImportedLibraries() ([]string, error) {
+	return f.DynString(DT_NEEDED)
+}
+
+// DynString returns the strings listed for the given tag in the file's dynamic
+// section.
+//
+// The tag must be one that takes string values: DT_NEEDED, DT_SONAME, DT_RPATH, or
+// DT_RUNPATH.
+func (f *File) DynString(tag DynTag) ([]string, error) {
+	switch tag {
+	case DT_NEEDED, DT_SONAME, DT_RPATH, DT_RUNPATH:
+	default:
+		return nil, fmt.Errorf("non-string-valued tag %v", tag)
+	}
+	ds := f.SectionByType(SHT_DYNAMIC)
+	if ds == nil {
+		// not dynamic, so no libraries
+		return nil, nil
+	}
+	d, err := ds.Data()
+	if err != nil {
+		return nil, err
+	}
+	str, err := f.stringTable(ds.Link)
+	if err != nil {
+		return nil, err
+	}
+	var all []string
+	for len(d) > 0 {
+		var t DynTag
+		var v uint64
+		switch f.Class {
+		case ELFCLASS32:
+			t = DynTag(f.ByteOrder.Uint32(d[0:4]))
+			v = uint64(f.ByteOrder.Uint32(d[4:8]))
+			d = d[8:]
+		case ELFCLASS64:
+			t = DynTag(f.ByteOrder.Uint64(d[0:8]))
+			v = f.ByteOrder.Uint64(d[8:16])
+			d = d[16:]
+		}
+		if t == tag {
+			s, ok := getString(str, int(v))
+			if ok {
+				all = append(all, s)
+			}
+		}
+	}
+	return all, nil
+}
diff --git a/src/debug/elf/file_test.go b/src/debug/elf/file_test.go
new file mode 100644
index 0000000..4c6fdee
--- /dev/null
+++ b/src/debug/elf/file_test.go
@@ -0,0 +1,938 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package elf
+
+import (
+	"bytes"
+	"compress/gzip"
+	"debug/dwarf"
+	"encoding/binary"
+	"io"
+	"math/rand"
+	"net"
+	"os"
+	"path"
+	"reflect"
+	"runtime"
+	"testing"
+)
+
+type fileTest struct {
+	file     string
+	hdr      FileHeader
+	sections []SectionHeader
+	progs    []ProgHeader
+	needed   []string
+}
+
+var fileTests = []fileTest{
+	{
+		"testdata/gcc-386-freebsd-exec",
+		FileHeader{ELFCLASS32, ELFDATA2LSB, EV_CURRENT, ELFOSABI_FREEBSD, 0, binary.LittleEndian, ET_EXEC, EM_386, 0x80483cc},
+		[]SectionHeader{
+			{"", SHT_NULL, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},
+			{".interp", SHT_PROGBITS, SHF_ALLOC, 0x80480d4, 0xd4, 0x15, 0x0, 0x0, 0x1, 0x0, 0x15},
+			{".hash", SHT_HASH, SHF_ALLOC, 0x80480ec, 0xec, 0x90, 0x3, 0x0, 0x4, 0x4, 0x90},
+			{".dynsym", SHT_DYNSYM, SHF_ALLOC, 0x804817c, 0x17c, 0x110, 0x4, 0x1, 0x4, 0x10, 0x110},
+			{".dynstr", SHT_STRTAB, SHF_ALLOC, 0x804828c, 0x28c, 0xbb, 0x0, 0x0, 0x1, 0x0, 0xbb},
+			{".rel.plt", SHT_REL, SHF_ALLOC, 0x8048348, 0x348, 0x20, 0x3, 0x7, 0x4, 0x8, 0x20},
+			{".init", SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR, 0x8048368, 0x368, 0x11, 0x0, 0x0, 0x4, 0x0, 0x11},
+			{".plt", SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR, 0x804837c, 0x37c, 0x50, 0x0, 0x0, 0x4, 0x4, 0x50},
+			{".text", SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR, 0x80483cc, 0x3cc, 0x180, 0x0, 0x0, 0x4, 0x0, 0x180},
+			{".fini", SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR, 0x804854c, 0x54c, 0xc, 0x0, 0x0, 0x4, 0x0, 0xc},
+			{".rodata", SHT_PROGBITS, SHF_ALLOC, 0x8048558, 0x558, 0xa3, 0x0, 0x0, 0x1, 0x0, 0xa3},
+			{".data", SHT_PROGBITS, SHF_WRITE + SHF_ALLOC, 0x80495fc, 0x5fc, 0xc, 0x0, 0x0, 0x4, 0x0, 0xc},
+			{".eh_frame", SHT_PROGBITS, SHF_ALLOC, 0x8049608, 0x608, 0x4, 0x0, 0x0, 0x4, 0x0, 0x4},
+			{".dynamic", SHT_DYNAMIC, SHF_WRITE + SHF_ALLOC, 0x804960c, 0x60c, 0x98, 0x4, 0x0, 0x4, 0x8, 0x98},
+			{".ctors", SHT_PROGBITS, SHF_WRITE + SHF_ALLOC, 0x80496a4, 0x6a4, 0x8, 0x0, 0x0, 0x4, 0x0, 0x8},
+			{".dtors", SHT_PROGBITS, SHF_WRITE + SHF_ALLOC, 0x80496ac, 0x6ac, 0x8, 0x0, 0x0, 0x4, 0x0, 0x8},
+			{".jcr", SHT_PROGBITS, SHF_WRITE + SHF_ALLOC, 0x80496b4, 0x6b4, 0x4, 0x0, 0x0, 0x4, 0x0, 0x4},
+			{".got", SHT_PROGBITS, SHF_WRITE + SHF_ALLOC, 0x80496b8, 0x6b8, 0x1c, 0x0, 0x0, 0x4, 0x4, 0x1c},
+			{".bss", SHT_NOBITS, SHF_WRITE + SHF_ALLOC, 0x80496d4, 0x6d4, 0x20, 0x0, 0x0, 0x4, 0x0, 0x20},
+			{".comment", SHT_PROGBITS, 0x0, 0x0, 0x6d4, 0x12d, 0x0, 0x0, 0x1, 0x0, 0x12d},
+			{".debug_aranges", SHT_PROGBITS, 0x0, 0x0, 0x801, 0x20, 0x0, 0x0, 0x1, 0x0, 0x20},
+			{".debug_pubnames", SHT_PROGBITS, 0x0, 0x0, 0x821, 0x1b, 0x0, 0x0, 0x1, 0x0, 0x1b},
+			{".debug_info", SHT_PROGBITS, 0x0, 0x0, 0x83c, 0x11d, 0x0, 0x0, 0x1, 0x0, 0x11d},
+			{".debug_abbrev", SHT_PROGBITS, 0x0, 0x0, 0x959, 0x41, 0x0, 0x0, 0x1, 0x0, 0x41},
+			{".debug_line", SHT_PROGBITS, 0x0, 0x0, 0x99a, 0x35, 0x0, 0x0, 0x1, 0x0, 0x35},
+			{".debug_frame", SHT_PROGBITS, 0x0, 0x0, 0x9d0, 0x30, 0x0, 0x0, 0x4, 0x0, 0x30},
+			{".debug_str", SHT_PROGBITS, 0x0, 0x0, 0xa00, 0xd, 0x0, 0x0, 0x1, 0x0, 0xd},
+			{".shstrtab", SHT_STRTAB, 0x0, 0x0, 0xa0d, 0xf8, 0x0, 0x0, 0x1, 0x0, 0xf8},
+			{".symtab", SHT_SYMTAB, 0x0, 0x0, 0xfb8, 0x4b0, 0x1d, 0x38, 0x4, 0x10, 0x4b0},
+			{".strtab", SHT_STRTAB, 0x0, 0x0, 0x1468, 0x206, 0x0, 0x0, 0x1, 0x0, 0x206},
+		},
+		[]ProgHeader{
+			{PT_PHDR, PF_R + PF_X, 0x34, 0x8048034, 0x8048034, 0xa0, 0xa0, 0x4},
+			{PT_INTERP, PF_R, 0xd4, 0x80480d4, 0x80480d4, 0x15, 0x15, 0x1},
+			{PT_LOAD, PF_R + PF_X, 0x0, 0x8048000, 0x8048000, 0x5fb, 0x5fb, 0x1000},
+			{PT_LOAD, PF_R + PF_W, 0x5fc, 0x80495fc, 0x80495fc, 0xd8, 0xf8, 0x1000},
+			{PT_DYNAMIC, PF_R + PF_W, 0x60c, 0x804960c, 0x804960c, 0x98, 0x98, 0x4},
+		},
+		[]string{"libc.so.6"},
+	},
+	{
+		"testdata/gcc-amd64-linux-exec",
+		FileHeader{ELFCLASS64, ELFDATA2LSB, EV_CURRENT, ELFOSABI_NONE, 0, binary.LittleEndian, ET_EXEC, EM_X86_64, 0x4003e0},
+		[]SectionHeader{
+			{"", SHT_NULL, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},
+			{".interp", SHT_PROGBITS, SHF_ALLOC, 0x400200, 0x200, 0x1c, 0x0, 0x0, 0x1, 0x0, 0x1c},
+			{".note.ABI-tag", SHT_NOTE, SHF_ALLOC, 0x40021c, 0x21c, 0x20, 0x0, 0x0, 0x4, 0x0, 0x20},
+			{".hash", SHT_HASH, SHF_ALLOC, 0x400240, 0x240, 0x24, 0x5, 0x0, 0x8, 0x4, 0x24},
+			{".gnu.hash", SHT_LOOS + 268435446, SHF_ALLOC, 0x400268, 0x268, 0x1c, 0x5, 0x0, 0x8, 0x0, 0x1c},
+			{".dynsym", SHT_DYNSYM, SHF_ALLOC, 0x400288, 0x288, 0x60, 0x6, 0x1, 0x8, 0x18, 0x60},
+			{".dynstr", SHT_STRTAB, SHF_ALLOC, 0x4002e8, 0x2e8, 0x3d, 0x0, 0x0, 0x1, 0x0, 0x3d},
+			{".gnu.version", SHT_HIOS, SHF_ALLOC, 0x400326, 0x326, 0x8, 0x5, 0x0, 0x2, 0x2, 0x8},
+			{".gnu.version_r", SHT_LOOS + 268435454, SHF_ALLOC, 0x400330, 0x330, 0x20, 0x6, 0x1, 0x8, 0x0, 0x20},
+			{".rela.dyn", SHT_RELA, SHF_ALLOC, 0x400350, 0x350, 0x18, 0x5, 0x0, 0x8, 0x18, 0x18},
+			{".rela.plt", SHT_RELA, SHF_ALLOC, 0x400368, 0x368, 0x30, 0x5, 0xc, 0x8, 0x18, 0x30},
+			{".init", SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR, 0x400398, 0x398, 0x18, 0x0, 0x0, 0x4, 0x0, 0x18},
+			{".plt", SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR, 0x4003b0, 0x3b0, 0x30, 0x0, 0x0, 0x4, 0x10, 0x30},
+			{".text", SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR, 0x4003e0, 0x3e0, 0x1b4, 0x0, 0x0, 0x10, 0x0, 0x1b4},
+			{".fini", SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR, 0x400594, 0x594, 0xe, 0x0, 0x0, 0x4, 0x0, 0xe},
+			{".rodata", SHT_PROGBITS, SHF_ALLOC, 0x4005a4, 0x5a4, 0x11, 0x0, 0x0, 0x4, 0x0, 0x11},
+			{".eh_frame_hdr", SHT_PROGBITS, SHF_ALLOC, 0x4005b8, 0x5b8, 0x24, 0x0, 0x0, 0x4, 0x0, 0x24},
+			{".eh_frame", SHT_PROGBITS, SHF_ALLOC, 0x4005e0, 0x5e0, 0xa4, 0x0, 0x0, 0x8, 0x0, 0xa4},
+			{".ctors", SHT_PROGBITS, SHF_WRITE + SHF_ALLOC, 0x600688, 0x688, 0x10, 0x0, 0x0, 0x8, 0x0, 0x10},
+			{".dtors", SHT_PROGBITS, SHF_WRITE + SHF_ALLOC, 0x600698, 0x698, 0x10, 0x0, 0x0, 0x8, 0x0, 0x10},
+			{".jcr", SHT_PROGBITS, SHF_WRITE + SHF_ALLOC, 0x6006a8, 0x6a8, 0x8, 0x0, 0x0, 0x8, 0x0, 0x8},
+			{".dynamic", SHT_DYNAMIC, SHF_WRITE + SHF_ALLOC, 0x6006b0, 0x6b0, 0x1a0, 0x6, 0x0, 0x8, 0x10, 0x1a0},
+			{".got", SHT_PROGBITS, SHF_WRITE + SHF_ALLOC, 0x600850, 0x850, 0x8, 0x0, 0x0, 0x8, 0x8, 0x8},
+			{".got.plt", SHT_PROGBITS, SHF_WRITE + SHF_ALLOC, 0x600858, 0x858, 0x28, 0x0, 0x0, 0x8, 0x8, 0x28},
+			{".data", SHT_PROGBITS, SHF_WRITE + SHF_ALLOC, 0x600880, 0x880, 0x18, 0x0, 0x0, 0x8, 0x0, 0x18},
+			{".bss", SHT_NOBITS, SHF_WRITE + SHF_ALLOC, 0x600898, 0x898, 0x8, 0x0, 0x0, 0x4, 0x0, 0x8},
+			{".comment", SHT_PROGBITS, 0x0, 0x0, 0x898, 0x126, 0x0, 0x0, 0x1, 0x0, 0x126},
+			{".debug_aranges", SHT_PROGBITS, 0x0, 0x0, 0x9c0, 0x90, 0x0, 0x0, 0x10, 0x0, 0x90},
+			{".debug_pubnames", SHT_PROGBITS, 0x0, 0x0, 0xa50, 0x25, 0x0, 0x0, 0x1, 0x0, 0x25},
+			{".debug_info", SHT_PROGBITS, 0x0, 0x0, 0xa75, 0x1a7, 0x0, 0x0, 0x1, 0x0, 0x1a7},
+			{".debug_abbrev", SHT_PROGBITS, 0x0, 0x0, 0xc1c, 0x6f, 0x0, 0x0, 0x1, 0x0, 0x6f},
+			{".debug_line", SHT_PROGBITS, 0x0, 0x0, 0xc8b, 0x13f, 0x0, 0x0, 0x1, 0x0, 0x13f},
+			{".debug_str", SHT_PROGBITS, SHF_MERGE + SHF_STRINGS, 0x0, 0xdca, 0xb1, 0x0, 0x0, 0x1, 0x1, 0xb1},
+			{".debug_ranges", SHT_PROGBITS, 0x0, 0x0, 0xe80, 0x90, 0x0, 0x0, 0x10, 0x0, 0x90},
+			{".shstrtab", SHT_STRTAB, 0x0, 0x0, 0xf10, 0x149, 0x0, 0x0, 0x1, 0x0, 0x149},
+			{".symtab", SHT_SYMTAB, 0x0, 0x0, 0x19a0, 0x6f0, 0x24, 0x39, 0x8, 0x18, 0x6f0},
+			{".strtab", SHT_STRTAB, 0x0, 0x0, 0x2090, 0x1fc, 0x0, 0x0, 0x1, 0x0, 0x1fc},
+		},
+		[]ProgHeader{
+			{PT_PHDR, PF_R + PF_X, 0x40, 0x400040, 0x400040, 0x1c0, 0x1c0, 0x8},
+			{PT_INTERP, PF_R, 0x200, 0x400200, 0x400200, 0x1c, 0x1c, 1},
+			{PT_LOAD, PF_R + PF_X, 0x0, 0x400000, 0x400000, 0x684, 0x684, 0x200000},
+			{PT_LOAD, PF_R + PF_W, 0x688, 0x600688, 0x600688, 0x210, 0x218, 0x200000},
+			{PT_DYNAMIC, PF_R + PF_W, 0x6b0, 0x6006b0, 0x6006b0, 0x1a0, 0x1a0, 0x8},
+			{PT_NOTE, PF_R, 0x21c, 0x40021c, 0x40021c, 0x20, 0x20, 0x4},
+			{PT_LOOS + 0x474E550, PF_R, 0x5b8, 0x4005b8, 0x4005b8, 0x24, 0x24, 0x4},
+			{PT_LOOS + 0x474E551, PF_R + PF_W, 0x0, 0x0, 0x0, 0x0, 0x0, 0x8},
+		},
+		[]string{"libc.so.6"},
+	},
+	{
+		"testdata/hello-world-core.gz",
+		FileHeader{ELFCLASS64, ELFDATA2LSB, EV_CURRENT, ELFOSABI_NONE, 0x0, binary.LittleEndian, ET_CORE, EM_X86_64, 0x0},
+		[]SectionHeader{},
+		[]ProgHeader{
+			{Type: PT_NOTE, Flags: 0x0, Off: 0x3f8, Vaddr: 0x0, Paddr: 0x0, Filesz: 0x8ac, Memsz: 0x0, Align: 0x0},
+			{Type: PT_LOAD, Flags: PF_X + PF_R, Off: 0x1000, Vaddr: 0x400000, Paddr: 0x0, Filesz: 0x0, Memsz: 0x1000, Align: 0x1000},
+			{Type: PT_LOAD, Flags: PF_R, Off: 0x1000, Vaddr: 0x401000, Paddr: 0x0, Filesz: 0x1000, Memsz: 0x1000, Align: 0x1000},
+			{Type: PT_LOAD, Flags: PF_W + PF_R, Off: 0x2000, Vaddr: 0x402000, Paddr: 0x0, Filesz: 0x1000, Memsz: 0x1000, Align: 0x1000},
+			{Type: PT_LOAD, Flags: PF_X + PF_R, Off: 0x3000, Vaddr: 0x7f54078b8000, Paddr: 0x0, Filesz: 0x0, Memsz: 0x1b5000, Align: 0x1000},
+			{Type: PT_LOAD, Flags: 0x0, Off: 0x3000, Vaddr: 0x7f5407a6d000, Paddr: 0x0, Filesz: 0x0, Memsz: 0x1ff000, Align: 0x1000},
+			{Type: PT_LOAD, Flags: PF_R, Off: 0x3000, Vaddr: 0x7f5407c6c000, Paddr: 0x0, Filesz: 0x4000, Memsz: 0x4000, Align: 0x1000},
+			{Type: PT_LOAD, Flags: PF_W + PF_R, Off: 0x7000, Vaddr: 0x7f5407c70000, Paddr: 0x0, Filesz: 0x2000, Memsz: 0x2000, Align: 0x1000},
+			{Type: PT_LOAD, Flags: PF_W + PF_R, Off: 0x9000, Vaddr: 0x7f5407c72000, Paddr: 0x0, Filesz: 0x5000, Memsz: 0x5000, Align: 0x1000},
+			{Type: PT_LOAD, Flags: PF_X + PF_R, Off: 0xe000, Vaddr: 0x7f5407c77000, Paddr: 0x0, Filesz: 0x0, Memsz: 0x22000, Align: 0x1000},
+			{Type: PT_LOAD, Flags: PF_W + PF_R, Off: 0xe000, Vaddr: 0x7f5407e81000, Paddr: 0x0, Filesz: 0x3000, Memsz: 0x3000, Align: 0x1000},
+			{Type: PT_LOAD, Flags: PF_W + PF_R, Off: 0x11000, Vaddr: 0x7f5407e96000, Paddr: 0x0, Filesz: 0x3000, Memsz: 0x3000, Align: 0x1000},
+			{Type: PT_LOAD, Flags: PF_R, Off: 0x14000, Vaddr: 0x7f5407e99000, Paddr: 0x0, Filesz: 0x1000, Memsz: 0x1000, Align: 0x1000},
+			{Type: PT_LOAD, Flags: PF_W + PF_R, Off: 0x15000, Vaddr: 0x7f5407e9a000, Paddr: 0x0, Filesz: 0x2000, Memsz: 0x2000, Align: 0x1000},
+			{Type: PT_LOAD, Flags: PF_W + PF_R, Off: 0x17000, Vaddr: 0x7fff79972000, Paddr: 0x0, Filesz: 0x23000, Memsz: 0x23000, Align: 0x1000},
+			{Type: PT_LOAD, Flags: PF_X + PF_R, Off: 0x3a000, Vaddr: 0x7fff799f8000, Paddr: 0x0, Filesz: 0x1000, Memsz: 0x1000, Align: 0x1000},
+			{Type: PT_LOAD, Flags: PF_X + PF_R, Off: 0x3b000, Vaddr: 0xffffffffff600000, Paddr: 0x0, Filesz: 0x1000, Memsz: 0x1000, Align: 0x1000},
+		},
+		nil,
+	},
+	{
+		"testdata/compressed-32.obj",
+		FileHeader{ELFCLASS32, ELFDATA2LSB, EV_CURRENT, ELFOSABI_NONE, 0x0, binary.LittleEndian, ET_REL, EM_386, 0x0},
+		[]SectionHeader{
+			{"", SHT_NULL, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},
+			{".text", SHT_PROGBITS, SHF_ALLOC | SHF_EXECINSTR, 0x0, 0x34, 0x17, 0x0, 0x0, 0x1, 0x0, 0x17},
+			{".rel.text", SHT_REL, SHF_INFO_LINK, 0x0, 0x3dc, 0x10, 0x13, 0x1, 0x4, 0x8, 0x10},
+			{".data", SHT_PROGBITS, SHF_WRITE | SHF_ALLOC, 0x0, 0x4b, 0x0, 0x0, 0x0, 0x1, 0x0, 0x0},
+			{".bss", SHT_NOBITS, SHF_WRITE | SHF_ALLOC, 0x0, 0x4b, 0x0, 0x0, 0x0, 0x1, 0x0, 0x0},
+			{".rodata", SHT_PROGBITS, SHF_ALLOC, 0x0, 0x4b, 0xd, 0x0, 0x0, 0x1, 0x0, 0xd},
+			{".debug_info", SHT_PROGBITS, SHF_COMPRESSED, 0x0, 0x58, 0xb4, 0x0, 0x0, 0x1, 0x0, 0x84},
+			{".rel.debug_info", SHT_REL, SHF_INFO_LINK, 0x0, 0x3ec, 0xa0, 0x13, 0x6, 0x4, 0x8, 0xa0},
+			{".debug_abbrev", SHT_PROGBITS, 0x0, 0x0, 0xdc, 0x5a, 0x0, 0x0, 0x1, 0x0, 0x5a},
+			{".debug_aranges", SHT_PROGBITS, 0x0, 0x0, 0x136, 0x20, 0x0, 0x0, 0x1, 0x0, 0x20},
+			{".rel.debug_aranges", SHT_REL, SHF_INFO_LINK, 0x0, 0x48c, 0x10, 0x13, 0x9, 0x4, 0x8, 0x10},
+			{".debug_line", SHT_PROGBITS, 0x0, 0x0, 0x156, 0x5c, 0x0, 0x0, 0x1, 0x0, 0x5c},
+			{".rel.debug_line", SHT_REL, SHF_INFO_LINK, 0x0, 0x49c, 0x8, 0x13, 0xb, 0x4, 0x8, 0x8},
+			{".debug_str", SHT_PROGBITS, SHF_MERGE | SHF_STRINGS | SHF_COMPRESSED, 0x0, 0x1b2, 0x10f, 0x0, 0x0, 0x1, 0x1, 0xb3},
+			{".comment", SHT_PROGBITS, SHF_MERGE | SHF_STRINGS, 0x0, 0x265, 0x2a, 0x0, 0x0, 0x1, 0x1, 0x2a},
+			{".note.GNU-stack", SHT_PROGBITS, 0x0, 0x0, 0x28f, 0x0, 0x0, 0x0, 0x1, 0x0, 0x0},
+			{".eh_frame", SHT_PROGBITS, SHF_ALLOC, 0x0, 0x290, 0x38, 0x0, 0x0, 0x4, 0x0, 0x38},
+			{".rel.eh_frame", SHT_REL, SHF_INFO_LINK, 0x0, 0x4a4, 0x8, 0x13, 0x10, 0x4, 0x8, 0x8},
+			{".shstrtab", SHT_STRTAB, 0x0, 0x0, 0x4ac, 0xab, 0x0, 0x0, 0x1, 0x0, 0xab},
+			{".symtab", SHT_SYMTAB, 0x0, 0x0, 0x2c8, 0x100, 0x14, 0xe, 0x4, 0x10, 0x100},
+			{".strtab", SHT_STRTAB, 0x0, 0x0, 0x3c8, 0x13, 0x0, 0x0, 0x1, 0x0, 0x13},
+		},
+		[]ProgHeader{},
+		nil,
+	},
+	{
+		"testdata/compressed-64.obj",
+		FileHeader{ELFCLASS64, ELFDATA2LSB, EV_CURRENT, ELFOSABI_NONE, 0x0, binary.LittleEndian, ET_REL, EM_X86_64, 0x0},
+		[]SectionHeader{
+			{"", SHT_NULL, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},
+			{".text", SHT_PROGBITS, SHF_ALLOC | SHF_EXECINSTR, 0x0, 0x40, 0x1b, 0x0, 0x0, 0x1, 0x0, 0x1b},
+			{".rela.text", SHT_RELA, SHF_INFO_LINK, 0x0, 0x488, 0x30, 0x13, 0x1, 0x8, 0x18, 0x30},
+			{".data", SHT_PROGBITS, SHF_WRITE | SHF_ALLOC, 0x0, 0x5b, 0x0, 0x0, 0x0, 0x1, 0x0, 0x0},
+			{".bss", SHT_NOBITS, SHF_WRITE | SHF_ALLOC, 0x0, 0x5b, 0x0, 0x0, 0x0, 0x1, 0x0, 0x0},
+			{".rodata", SHT_PROGBITS, SHF_ALLOC, 0x0, 0x5b, 0xd, 0x0, 0x0, 0x1, 0x0, 0xd},
+			{".debug_info", SHT_PROGBITS, SHF_COMPRESSED, 0x0, 0x68, 0xba, 0x0, 0x0, 0x1, 0x0, 0x72},
+			{".rela.debug_info", SHT_RELA, SHF_INFO_LINK, 0x0, 0x4b8, 0x1c8, 0x13, 0x6, 0x8, 0x18, 0x1c8},
+			{".debug_abbrev", SHT_PROGBITS, 0x0, 0x0, 0xda, 0x5c, 0x0, 0x0, 0x1, 0x0, 0x5c},
+			{".debug_aranges", SHT_PROGBITS, SHF_COMPRESSED, 0x0, 0x136, 0x30, 0x0, 0x0, 0x1, 0x0, 0x2f},
+			{".rela.debug_aranges", SHT_RELA, SHF_INFO_LINK, 0x0, 0x680, 0x30, 0x13, 0x9, 0x8, 0x18, 0x30},
+			{".debug_line", SHT_PROGBITS, 0x0, 0x0, 0x165, 0x60, 0x0, 0x0, 0x1, 0x0, 0x60},
+			{".rela.debug_line", SHT_RELA, SHF_INFO_LINK, 0x0, 0x6b0, 0x18, 0x13, 0xb, 0x8, 0x18, 0x18},
+			{".debug_str", SHT_PROGBITS, SHF_MERGE | SHF_STRINGS | SHF_COMPRESSED, 0x0, 0x1c5, 0x104, 0x0, 0x0, 0x1, 0x1, 0xc3},
+			{".comment", SHT_PROGBITS, SHF_MERGE | SHF_STRINGS, 0x0, 0x288, 0x2a, 0x0, 0x0, 0x1, 0x1, 0x2a},
+			{".note.GNU-stack", SHT_PROGBITS, 0x0, 0x0, 0x2b2, 0x0, 0x0, 0x0, 0x1, 0x0, 0x0},
+			{".eh_frame", SHT_PROGBITS, SHF_ALLOC, 0x0, 0x2b8, 0x38, 0x0, 0x0, 0x8, 0x0, 0x38},
+			{".rela.eh_frame", SHT_RELA, SHF_INFO_LINK, 0x0, 0x6c8, 0x18, 0x13, 0x10, 0x8, 0x18, 0x18},
+			{".shstrtab", SHT_STRTAB, 0x0, 0x0, 0x6e0, 0xb0, 0x0, 0x0, 0x1, 0x0, 0xb0},
+			{".symtab", SHT_SYMTAB, 0x0, 0x0, 0x2f0, 0x180, 0x14, 0xe, 0x8, 0x18, 0x180},
+			{".strtab", SHT_STRTAB, 0x0, 0x0, 0x470, 0x13, 0x0, 0x0, 0x1, 0x0, 0x13},
+		},
+		[]ProgHeader{},
+		nil,
+	},
+}
+
+func TestOpen(t *testing.T) {
+	for i := range fileTests {
+		tt := &fileTests[i]
+
+		var f *File
+		var err error
+		if path.Ext(tt.file) == ".gz" {
+			var r io.ReaderAt
+			if r, err = decompress(tt.file); err == nil {
+				f, err = NewFile(r)
+			}
+		} else {
+			f, err = Open(tt.file)
+		}
+		if err != nil {
+			t.Errorf("cannot open file %s: %v", tt.file, err)
+			continue
+		}
+		defer f.Close()
+		if !reflect.DeepEqual(f.FileHeader, tt.hdr) {
+			t.Errorf("open %s:\n\thave %#v\n\twant %#v\n", tt.file, f.FileHeader, tt.hdr)
+			continue
+		}
+		for i, s := range f.Sections {
+			if i >= len(tt.sections) {
+				break
+			}
+			sh := &tt.sections[i]
+			if !reflect.DeepEqual(&s.SectionHeader, sh) {
+				t.Errorf("open %s, section %d:\n\thave %#v\n\twant %#v\n", tt.file, i, &s.SectionHeader, sh)
+			}
+		}
+		for i, p := range f.Progs {
+			if i >= len(tt.progs) {
+				break
+			}
+			ph := &tt.progs[i]
+			if !reflect.DeepEqual(&p.ProgHeader, ph) {
+				t.Errorf("open %s, program %d:\n\thave %#v\n\twant %#v\n", tt.file, i, &p.ProgHeader, ph)
+			}
+		}
+		tn := len(tt.sections)
+		fn := len(f.Sections)
+		if tn != fn {
+			t.Errorf("open %s: len(Sections) = %d, want %d", tt.file, fn, tn)
+		}
+		tn = len(tt.progs)
+		fn = len(f.Progs)
+		if tn != fn {
+			t.Errorf("open %s: len(Progs) = %d, want %d", tt.file, fn, tn)
+		}
+		tl := tt.needed
+		fl, err := f.ImportedLibraries()
+		if err != nil {
+			t.Error(err)
+		}
+		if !reflect.DeepEqual(tl, fl) {
+			t.Errorf("open %s: DT_NEEDED = %v, want %v", tt.file, tl, fl)
+		}
+	}
+}
+
+// elf.NewFile requires io.ReaderAt, which compress/gzip cannot
+// provide. Decompress the file to a bytes.Reader.
+func decompress(gz string) (io.ReaderAt, error) {
+	in, err := os.Open(gz)
+	if err != nil {
+		return nil, err
+	}
+	defer in.Close()
+	r, err := gzip.NewReader(in)
+	if err != nil {
+		return nil, err
+	}
+	var out bytes.Buffer
+	_, err = io.Copy(&out, r)
+	return bytes.NewReader(out.Bytes()), err
+}
+
+type relocationTestEntry struct {
+	entryNumber int
+	entry       *dwarf.Entry
+	pcRanges    [][2]uint64
+}
+
+type relocationTest struct {
+	file    string
+	entries []relocationTestEntry
+}
+
+var relocationTests = []relocationTest{
+	{
+		"testdata/go-relocation-test-gcc441-x86-64.obj",
+		[]relocationTestEntry{
+			{
+				entry: &dwarf.Entry{
+					Offset:   0xb,
+					Tag:      dwarf.TagCompileUnit,
+					Children: true,
+					Field: []dwarf.Field{
+						{Attr: dwarf.AttrProducer, Val: "GNU C 4.4.1", Class: dwarf.ClassString},
+						{Attr: dwarf.AttrLanguage, Val: int64(1), Class: dwarf.ClassConstant},
+						{Attr: dwarf.AttrName, Val: "go-relocation-test.c", Class: dwarf.ClassString},
+						{Attr: dwarf.AttrCompDir, Val: "/tmp", Class: dwarf.ClassString},
+						{Attr: dwarf.AttrLowpc, Val: uint64(0x0), Class: dwarf.ClassAddress},
+						{Attr: dwarf.AttrHighpc, Val: uint64(0x6), Class: dwarf.ClassAddress},
+						{Attr: dwarf.AttrStmtList, Val: int64(0), Class: dwarf.ClassLinePtr},
+					},
+				},
+				pcRanges: [][2]uint64{{0x0, 0x6}},
+			},
+		},
+	},
+	{
+		"testdata/go-relocation-test-gcc441-x86.obj",
+		[]relocationTestEntry{
+			{
+				entry: &dwarf.Entry{
+					Offset:   0xb,
+					Tag:      dwarf.TagCompileUnit,
+					Children: true,
+					Field: []dwarf.Field{
+						{Attr: dwarf.AttrProducer, Val: "GNU C 4.4.1", Class: dwarf.ClassString},
+						{Attr: dwarf.AttrLanguage, Val: int64(1), Class: dwarf.ClassConstant},
+						{Attr: dwarf.AttrName, Val: "t.c", Class: dwarf.ClassString},
+						{Attr: dwarf.AttrCompDir, Val: "/tmp", Class: dwarf.ClassString},
+						{Attr: dwarf.AttrLowpc, Val: uint64(0x0), Class: dwarf.ClassAddress},
+						{Attr: dwarf.AttrHighpc, Val: uint64(0x5), Class: dwarf.ClassAddress},
+						{Attr: dwarf.AttrStmtList, Val: int64(0), Class: dwarf.ClassLinePtr},
+					},
+				},
+				pcRanges: [][2]uint64{{0x0, 0x5}},
+			},
+		},
+	},
+	{
+		"testdata/go-relocation-test-gcc424-x86-64.obj",
+		[]relocationTestEntry{
+			{
+				entry: &dwarf.Entry{
+					Offset:   0xb,
+					Tag:      dwarf.TagCompileUnit,
+					Children: true,
+					Field: []dwarf.Field{
+						{Attr: dwarf.AttrProducer, Val: "GNU C 4.2.4 (Ubuntu 4.2.4-1ubuntu4)", Class: dwarf.ClassString},
+						{Attr: dwarf.AttrLanguage, Val: int64(1), Class: dwarf.ClassConstant},
+						{Attr: dwarf.AttrName, Val: "go-relocation-test-gcc424.c", Class: dwarf.ClassString},
+						{Attr: dwarf.AttrCompDir, Val: "/tmp", Class: dwarf.ClassString},
+						{Attr: dwarf.AttrLowpc, Val: uint64(0x0), Class: dwarf.ClassAddress},
+						{Attr: dwarf.AttrHighpc, Val: uint64(0x6), Class: dwarf.ClassAddress},
+						{Attr: dwarf.AttrStmtList, Val: int64(0), Class: dwarf.ClassLinePtr},
+					},
+				},
+				pcRanges: [][2]uint64{{0x0, 0x6}},
+			},
+		},
+	},
+	{
+		"testdata/go-relocation-test-gcc482-aarch64.obj",
+		[]relocationTestEntry{
+			{
+				entry: &dwarf.Entry{
+					Offset:   0xb,
+					Tag:      dwarf.TagCompileUnit,
+					Children: true,
+					Field: []dwarf.Field{
+						{Attr: dwarf.AttrProducer, Val: "GNU C 4.8.2 -g -fstack-protector", Class: dwarf.ClassString},
+						{Attr: dwarf.AttrLanguage, Val: int64(1), Class: dwarf.ClassConstant},
+						{Attr: dwarf.AttrName, Val: "go-relocation-test-gcc482.c", Class: dwarf.ClassString},
+						{Attr: dwarf.AttrCompDir, Val: "/tmp", Class: dwarf.ClassString},
+						{Attr: dwarf.AttrLowpc, Val: uint64(0x0), Class: dwarf.ClassAddress},
+						{Attr: dwarf.AttrHighpc, Val: int64(0x24), Class: dwarf.ClassConstant},
+						{Attr: dwarf.AttrStmtList, Val: int64(0), Class: dwarf.ClassLinePtr},
+					},
+				},
+				pcRanges: [][2]uint64{{0x0, 0x24}},
+			},
+		},
+	},
+	{
+		"testdata/go-relocation-test-gcc492-arm.obj",
+		[]relocationTestEntry{
+			{
+				entry: &dwarf.Entry{
+					Offset:   0xb,
+					Tag:      dwarf.TagCompileUnit,
+					Children: true,
+					Field: []dwarf.Field{
+						{Attr: dwarf.AttrProducer, Val: "GNU C 4.9.2 20141224 (prerelease) -march=armv7-a -mfloat-abi=hard -mfpu=vfpv3-d16 -mtls-dialect=gnu -g", Class: dwarf.ClassString},
+						{Attr: dwarf.AttrLanguage, Val: int64(1), Class: dwarf.ClassConstant},
+						{Attr: dwarf.AttrName, Val: "go-relocation-test-gcc492.c", Class: dwarf.ClassString},
+						{Attr: dwarf.AttrCompDir, Val: "/root/go/src/debug/elf/testdata", Class: dwarf.ClassString},
+						{Attr: dwarf.AttrLowpc, Val: uint64(0x0), Class: dwarf.ClassAddress},
+						{Attr: dwarf.AttrHighpc, Val: int64(0x28), Class: dwarf.ClassConstant},
+						{Attr: dwarf.AttrStmtList, Val: int64(0), Class: dwarf.ClassLinePtr},
+					},
+				},
+				pcRanges: [][2]uint64{{0x0, 0x28}},
+			},
+		},
+	},
+	{
+		"testdata/go-relocation-test-clang-arm.obj",
+		[]relocationTestEntry{
+			{
+				entry: &dwarf.Entry{
+					Offset:   0xb,
+					Tag:      dwarf.TagCompileUnit,
+					Children: true,
+					Field: []dwarf.Field{
+						{Attr: dwarf.AttrProducer, Val: "Debian clang version 3.5.0-10 (tags/RELEASE_350/final) (based on LLVM 3.5.0)", Class: dwarf.ClassString},
+						{Attr: dwarf.AttrLanguage, Val: int64(12), Class: dwarf.ClassConstant},
+						{Attr: dwarf.AttrName, Val: "hello.c", Class: dwarf.ClassString},
+						{Attr: dwarf.AttrStmtList, Val: int64(0x0), Class: dwarf.ClassLinePtr},
+						{Attr: dwarf.AttrCompDir, Val: "/tmp", Class: dwarf.ClassString},
+						{Attr: dwarf.AttrLowpc, Val: uint64(0x0), Class: dwarf.ClassAddress},
+						{Attr: dwarf.AttrHighpc, Val: int64(0x30), Class: dwarf.ClassConstant},
+					},
+				},
+				pcRanges: [][2]uint64{{0x0, 0x30}},
+			},
+		},
+	},
+	{
+		"testdata/go-relocation-test-gcc5-ppc.obj",
+		[]relocationTestEntry{
+			{
+				entry: &dwarf.Entry{
+					Offset:   0xb,
+					Tag:      dwarf.TagCompileUnit,
+					Children: true,
+					Field: []dwarf.Field{
+						{Attr: dwarf.AttrProducer, Val: "GNU C11 5.0.0 20150116 (experimental) -Asystem=linux -Asystem=unix -Asystem=posix -g", Class: dwarf.ClassString},
+						{Attr: dwarf.AttrLanguage, Val: int64(12), Class: dwarf.ClassConstant},
+						{Attr: dwarf.AttrName, Val: "go-relocation-test-gcc5-ppc.c", Class: dwarf.ClassString},
+						{Attr: dwarf.AttrCompDir, Val: "/tmp", Class: dwarf.ClassString},
+						{Attr: dwarf.AttrLowpc, Val: uint64(0x0), Class: dwarf.ClassAddress},
+						{Attr: dwarf.AttrHighpc, Val: int64(0x44), Class: dwarf.ClassConstant},
+						{Attr: dwarf.AttrStmtList, Val: int64(0), Class: dwarf.ClassLinePtr},
+					},
+				},
+				pcRanges: [][2]uint64{{0x0, 0x44}},
+			},
+		},
+	},
+	{
+		"testdata/go-relocation-test-gcc482-ppc64le.obj",
+		[]relocationTestEntry{
+			{
+				entry: &dwarf.Entry{
+					Offset:   0xb,
+					Tag:      dwarf.TagCompileUnit,
+					Children: true,
+					Field: []dwarf.Field{
+						{Attr: dwarf.AttrProducer, Val: "GNU C 4.8.2 -Asystem=linux -Asystem=unix -Asystem=posix -msecure-plt -mtune=power8 -mcpu=power7 -gdwarf-2 -fstack-protector", Class: dwarf.ClassString},
+						{Attr: dwarf.AttrLanguage, Val: int64(1), Class: dwarf.ClassConstant},
+						{Attr: dwarf.AttrName, Val: "go-relocation-test-gcc482-ppc64le.c", Class: dwarf.ClassString},
+						{Attr: dwarf.AttrCompDir, Val: "/tmp", Class: dwarf.ClassString},
+						{Attr: dwarf.AttrLowpc, Val: uint64(0x0), Class: dwarf.ClassAddress},
+						{Attr: dwarf.AttrHighpc, Val: uint64(0x24), Class: dwarf.ClassAddress},
+						{Attr: dwarf.AttrStmtList, Val: int64(0), Class: dwarf.ClassLinePtr},
+					},
+				},
+				pcRanges: [][2]uint64{{0x0, 0x24}},
+			},
+		},
+	},
+	{
+		"testdata/go-relocation-test-gcc492-mips64.obj",
+		[]relocationTestEntry{
+			{
+				entry: &dwarf.Entry{
+					Offset:   0xb,
+					Tag:      dwarf.TagCompileUnit,
+					Children: true,
+					Field: []dwarf.Field{
+						{Attr: dwarf.AttrProducer, Val: "GNU C 4.9.2 -meb -mabi=64 -march=mips3 -mtune=mips64 -mllsc -mno-shared -g", Class: dwarf.ClassString},
+						{Attr: dwarf.AttrLanguage, Val: int64(1), Class: dwarf.ClassConstant},
+						{Attr: dwarf.AttrName, Val: "hello.c", Class: dwarf.ClassString},
+						{Attr: dwarf.AttrCompDir, Val: "/tmp", Class: dwarf.ClassString},
+						{Attr: dwarf.AttrLowpc, Val: uint64(0x0), Class: dwarf.ClassAddress},
+						{Attr: dwarf.AttrHighpc, Val: int64(0x64), Class: dwarf.ClassConstant},
+						{Attr: dwarf.AttrStmtList, Val: int64(0), Class: dwarf.ClassLinePtr},
+					},
+				},
+				pcRanges: [][2]uint64{{0x0, 0x64}},
+			},
+		},
+	},
+	{
+		"testdata/go-relocation-test-gcc531-s390x.obj",
+		[]relocationTestEntry{
+			{
+				entry: &dwarf.Entry{
+					Offset:   0xb,
+					Tag:      dwarf.TagCompileUnit,
+					Children: true,
+					Field: []dwarf.Field{
+						{Attr: dwarf.AttrProducer, Val: "GNU C11 5.3.1 20160316 -march=zEC12 -m64 -mzarch -g -fstack-protector-strong", Class: dwarf.ClassString},
+						{Attr: dwarf.AttrLanguage, Val: int64(12), Class: dwarf.ClassConstant},
+						{Attr: dwarf.AttrName, Val: "hello.c", Class: dwarf.ClassString},
+						{Attr: dwarf.AttrCompDir, Val: "/tmp", Class: dwarf.ClassString},
+						{Attr: dwarf.AttrLowpc, Val: uint64(0x0), Class: dwarf.ClassAddress},
+						{Attr: dwarf.AttrHighpc, Val: int64(0x3a), Class: dwarf.ClassConstant},
+						{Attr: dwarf.AttrStmtList, Val: int64(0), Class: dwarf.ClassLinePtr},
+					},
+				},
+				pcRanges: [][2]uint64{{0x0, 0x3a}},
+			},
+		},
+	},
+	{
+		"testdata/go-relocation-test-gcc620-sparc64.obj",
+		[]relocationTestEntry{
+			{
+				entry: &dwarf.Entry{
+					Offset:   0xb,
+					Tag:      dwarf.TagCompileUnit,
+					Children: true,
+					Field: []dwarf.Field{
+						{Attr: dwarf.AttrProducer, Val: "GNU C11 6.2.0 20160914 -mcpu=v9 -g -fstack-protector-strong", Class: dwarf.ClassString},
+						{Attr: dwarf.AttrLanguage, Val: int64(12), Class: dwarf.ClassConstant},
+						{Attr: dwarf.AttrName, Val: "hello.c", Class: dwarf.ClassString},
+						{Attr: dwarf.AttrCompDir, Val: "/tmp", Class: dwarf.ClassString},
+						{Attr: dwarf.AttrLowpc, Val: uint64(0x0), Class: dwarf.ClassAddress},
+						{Attr: dwarf.AttrHighpc, Val: int64(0x2c), Class: dwarf.ClassConstant},
+						{Attr: dwarf.AttrStmtList, Val: int64(0), Class: dwarf.ClassLinePtr},
+					},
+				},
+				pcRanges: [][2]uint64{{0x0, 0x2c}},
+			},
+		},
+	},
+	{
+		"testdata/go-relocation-test-gcc492-mipsle.obj",
+		[]relocationTestEntry{
+			{
+				entry: &dwarf.Entry{
+					Offset:   0xb,
+					Tag:      dwarf.TagCompileUnit,
+					Children: true,
+					Field: []dwarf.Field{
+						{Attr: dwarf.AttrProducer, Val: "GNU C 4.9.2 -mel -march=mips2 -mtune=mips32 -mllsc -mno-shared -mabi=32 -g", Class: dwarf.ClassString},
+						{Attr: dwarf.AttrLanguage, Val: int64(1), Class: dwarf.ClassConstant},
+						{Attr: dwarf.AttrName, Val: "hello.c", Class: dwarf.ClassString},
+						{Attr: dwarf.AttrCompDir, Val: "/tmp", Class: dwarf.ClassString},
+						{Attr: dwarf.AttrLowpc, Val: uint64(0x0), Class: dwarf.ClassAddress},
+						{Attr: dwarf.AttrHighpc, Val: int64(0x58), Class: dwarf.ClassConstant},
+						{Attr: dwarf.AttrStmtList, Val: int64(0), Class: dwarf.ClassLinePtr},
+					},
+				},
+				pcRanges: [][2]uint64{{0x0, 0x58}},
+			},
+		},
+	},
+	{
+		"testdata/go-relocation-test-gcc540-mips.obj",
+		[]relocationTestEntry{
+			{
+				entry: &dwarf.Entry{
+					Offset:   0xb,
+					Tag:      dwarf.TagCompileUnit,
+					Children: true,
+					Field: []dwarf.Field{
+						{Attr: dwarf.AttrProducer, Val: "GNU C11 5.4.0 20160609 -meb -mips32 -mtune=mips32r2 -mfpxx -mllsc -mno-shared -mabi=32 -g -gdwarf-2", Class: dwarf.ClassString},
+						{Attr: dwarf.AttrLanguage, Val: int64(12), Class: dwarf.ClassConstant},
+						{Attr: dwarf.AttrName, Val: "hello.c", Class: dwarf.ClassString},
+						{Attr: dwarf.AttrCompDir, Val: "/tmp", Class: dwarf.ClassString},
+						{Attr: dwarf.AttrLowpc, Val: uint64(0x0), Class: dwarf.ClassAddress},
+						{Attr: dwarf.AttrHighpc, Val: uint64(0x5c), Class: dwarf.ClassAddress},
+						{Attr: dwarf.AttrStmtList, Val: int64(0), Class: dwarf.ClassLinePtr},
+					},
+				},
+				pcRanges: [][2]uint64{{0x0, 0x5c}},
+			},
+		},
+	},
+	{
+		"testdata/go-relocation-test-gcc493-mips64le.obj",
+		[]relocationTestEntry{
+			{
+				entry: &dwarf.Entry{
+					Offset:   0xb,
+					Tag:      dwarf.TagCompileUnit,
+					Children: true,
+					Field: []dwarf.Field{
+						{Attr: dwarf.AttrProducer, Val: "GNU C 4.9.3 -mel -mabi=64 -mllsc -mno-shared -g -fstack-protector-strong", Class: dwarf.ClassString},
+						{Attr: dwarf.AttrLanguage, Val: int64(1), Class: dwarf.ClassConstant},
+						{Attr: dwarf.AttrName, Val: "hello.c", Class: dwarf.ClassString},
+						{Attr: dwarf.AttrCompDir, Val: "/tmp", Class: dwarf.ClassString},
+						{Attr: dwarf.AttrLowpc, Val: uint64(0x0), Class: dwarf.ClassAddress},
+						{Attr: dwarf.AttrHighpc, Val: int64(0x64), Class: dwarf.ClassConstant},
+						{Attr: dwarf.AttrStmtList, Val: int64(0), Class: dwarf.ClassLinePtr},
+					},
+				},
+				pcRanges: [][2]uint64{{0x0, 0x64}},
+			},
+		},
+	},
+	{
+		"testdata/go-relocation-test-gcc720-riscv64.obj",
+		[]relocationTestEntry{
+			{
+				entry: &dwarf.Entry{
+					Offset:   0xb,
+					Tag:      dwarf.TagCompileUnit,
+					Children: true,
+					Field: []dwarf.Field{
+						{Attr: dwarf.AttrProducer, Val: "GNU C11 7.2.0 -march=rv64imafdc -mabi=lp64d -g -gdwarf-2", Class: dwarf.ClassString},
+						{Attr: dwarf.AttrLanguage, Val: int64(12), Class: dwarf.ClassConstant},
+						{Attr: dwarf.AttrName, Val: "hello.c", Class: dwarf.ClassString},
+						{Attr: dwarf.AttrCompDir, Val: "/tmp", Class: dwarf.ClassString},
+						{Attr: dwarf.AttrLowpc, Val: uint64(0x0), Class: dwarf.ClassAddress},
+						{Attr: dwarf.AttrHighpc, Val: uint64(0x2c), Class: dwarf.ClassAddress},
+						{Attr: dwarf.AttrStmtList, Val: int64(0), Class: dwarf.ClassLinePtr},
+					},
+				},
+				pcRanges: [][2]uint64{{0x0, 0x2c}},
+			},
+		},
+	},
+	{
+		"testdata/go-relocation-test-clang-x86.obj",
+		[]relocationTestEntry{
+			{
+				entry: &dwarf.Entry{
+					Offset:   0xb,
+					Tag:      dwarf.TagCompileUnit,
+					Children: true,
+					Field: []dwarf.Field{
+						{Attr: dwarf.AttrProducer, Val: "clang version google3-trunk (trunk r209387)", Class: dwarf.ClassString},
+						{Attr: dwarf.AttrLanguage, Val: int64(12), Class: dwarf.ClassConstant},
+						{Attr: dwarf.AttrName, Val: "go-relocation-test-clang.c", Class: dwarf.ClassString},
+						{Attr: dwarf.AttrStmtList, Val: int64(0), Class: dwarf.ClassLinePtr},
+						{Attr: dwarf.AttrCompDir, Val: "/tmp", Class: dwarf.ClassString},
+					},
+				},
+			},
+		},
+	},
+	{
+		"testdata/gcc-amd64-openbsd-debug-with-rela.obj",
+		[]relocationTestEntry{
+			{
+				entryNumber: 203,
+				entry: &dwarf.Entry{
+					Offset:   0xc62,
+					Tag:      dwarf.TagMember,
+					Children: false,
+					Field: []dwarf.Field{
+						{Attr: dwarf.AttrName, Val: "it_interval", Class: dwarf.ClassString},
+						{Attr: dwarf.AttrDeclFile, Val: int64(7), Class: dwarf.ClassConstant},
+						{Attr: dwarf.AttrDeclLine, Val: int64(236), Class: dwarf.ClassConstant},
+						{Attr: dwarf.AttrType, Val: dwarf.Offset(0xb7f), Class: dwarf.ClassReference},
+						{Attr: dwarf.AttrDataMemberLoc, Val: []byte{0x23, 0x0}, Class: dwarf.ClassExprLoc},
+					},
+				},
+			},
+			{
+				entryNumber: 204,
+				entry: &dwarf.Entry{
+					Offset:   0xc70,
+					Tag:      dwarf.TagMember,
+					Children: false,
+					Field: []dwarf.Field{
+						{Attr: dwarf.AttrName, Val: "it_value", Class: dwarf.ClassString},
+						{Attr: dwarf.AttrDeclFile, Val: int64(7), Class: dwarf.ClassConstant},
+						{Attr: dwarf.AttrDeclLine, Val: int64(237), Class: dwarf.ClassConstant},
+						{Attr: dwarf.AttrType, Val: dwarf.Offset(0xb7f), Class: dwarf.ClassReference},
+						{Attr: dwarf.AttrDataMemberLoc, Val: []byte{0x23, 0x10}, Class: dwarf.ClassExprLoc},
+					},
+				},
+			},
+		},
+	},
+	{
+		"testdata/go-relocation-test-gcc930-ranges-no-rela-x86-64",
+		[]relocationTestEntry{
+			{
+				entry: &dwarf.Entry{
+					Offset:   0xb,
+					Tag:      dwarf.TagCompileUnit,
+					Children: true,
+					Field: []dwarf.Field{
+						{Attr: dwarf.AttrProducer, Val: "GNU C17 9.3.0 -mtune=generic -march=x86-64 -g -fno-asynchronous-unwind-tables", Class: dwarf.ClassString},
+						{Attr: dwarf.AttrLanguage, Val: int64(12), Class: dwarf.ClassConstant},
+						{Attr: dwarf.AttrName, Val: "multiple-code-sections.c", Class: dwarf.ClassString},
+						{Attr: dwarf.AttrCompDir, Val: "/tmp", Class: dwarf.ClassString},
+						{Attr: dwarf.AttrRanges, Val: int64(0), Class: dwarf.ClassRangeListPtr},
+						{Attr: dwarf.AttrLowpc, Val: uint64(0), Class: dwarf.ClassAddress},
+						{Attr: dwarf.AttrStmtList, Val: int64(0), Class: dwarf.ClassLinePtr},
+					},
+				},
+				pcRanges: [][2]uint64{
+					{0x765, 0x777},
+					{0x7e1, 0x7ec},
+				},
+			},
+		},
+	},
+	{
+		"testdata/go-relocation-test-gcc930-ranges-with-rela-x86-64",
+		[]relocationTestEntry{
+			{
+				entry: &dwarf.Entry{
+					Offset:   0xb,
+					Tag:      dwarf.TagCompileUnit,
+					Children: true,
+					Field: []dwarf.Field{
+						{Attr: dwarf.AttrProducer, Val: "GNU C17 9.3.0 -mtune=generic -march=x86-64 -g -fno-asynchronous-unwind-tables", Class: dwarf.ClassString},
+						{Attr: dwarf.AttrLanguage, Val: int64(12), Class: dwarf.ClassConstant},
+						{Attr: dwarf.AttrName, Val: "multiple-code-sections.c", Class: dwarf.ClassString},
+						{Attr: dwarf.AttrCompDir, Val: "/tmp", Class: dwarf.ClassString},
+						{Attr: dwarf.AttrRanges, Val: int64(0), Class: dwarf.ClassRangeListPtr},
+						{Attr: dwarf.AttrLowpc, Val: uint64(0), Class: dwarf.ClassAddress},
+						{Attr: dwarf.AttrStmtList, Val: int64(0), Class: dwarf.ClassLinePtr},
+					},
+				},
+				pcRanges: [][2]uint64{
+					{0x765, 0x777},
+					{0x7e1, 0x7ec},
+				},
+			},
+		},
+	},
+}
+
+func TestDWARFRelocations(t *testing.T) {
+	for _, test := range relocationTests {
+		test := test
+		t.Run(test.file, func(t *testing.T) {
+			t.Parallel()
+			f, err := Open(test.file)
+			if err != nil {
+				t.Fatal(err)
+			}
+			dwarf, err := f.DWARF()
+			if err != nil {
+				t.Fatal(err)
+			}
+			reader := dwarf.Reader()
+			idx := 0
+			for _, testEntry := range test.entries {
+				if testEntry.entryNumber < idx {
+					t.Fatalf("internal test error: %d < %d", testEntry.entryNumber, idx)
+				}
+				for ; idx < testEntry.entryNumber; idx++ {
+					entry, err := reader.Next()
+					if entry == nil || err != nil {
+						t.Fatalf("Failed to skip to entry %d: %v", testEntry.entryNumber, err)
+					}
+				}
+				entry, err := reader.Next()
+				idx++
+				if err != nil {
+					t.Fatal(err)
+				}
+				if !reflect.DeepEqual(testEntry.entry, entry) {
+					t.Errorf("entry %d mismatch: got:%#v want:%#v", testEntry.entryNumber, entry, testEntry.entry)
+				}
+				pcRanges, err := dwarf.Ranges(entry)
+				if err != nil {
+					t.Fatal(err)
+				}
+				if !reflect.DeepEqual(testEntry.pcRanges, pcRanges) {
+					t.Errorf("entry %d: PC range mismatch: got:%#v want:%#v", testEntry.entryNumber, pcRanges, testEntry.pcRanges)
+				}
+			}
+		})
+	}
+}
+
+func TestCompressedDWARF(t *testing.T) {
+	// Test file built with GCC 4.8.4 and as 2.24 using:
+	// gcc -Wa,--compress-debug-sections -g -c -o zdebug-test-gcc484-x86-64.obj hello.c
+	f, err := Open("testdata/zdebug-test-gcc484-x86-64.obj")
+	if err != nil {
+		t.Fatal(err)
+	}
+	dwarf, err := f.DWARF()
+	if err != nil {
+		t.Fatal(err)
+	}
+	reader := dwarf.Reader()
+	n := 0
+	for {
+		entry, err := reader.Next()
+		if err != nil {
+			t.Fatal(err)
+		}
+		if entry == nil {
+			break
+		}
+		n++
+	}
+	if n != 18 {
+		t.Fatalf("want %d DWARF entries, got %d", 18, n)
+	}
+}
+
+func TestCompressedSection(t *testing.T) {
+	// Test files built with gcc -g -S hello.c and assembled with
+	// --compress-debug-sections=zlib-gabi.
+	f, err := Open("testdata/compressed-64.obj")
+	if err != nil {
+		t.Fatal(err)
+	}
+	sec := f.Section(".debug_info")
+	wantData := []byte{
+		182, 0, 0, 0, 4, 0, 0, 0, 0, 0, 8, 1, 0, 0, 0, 0,
+		1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+		0, 27, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 8, 7,
+		0, 0, 0, 0, 2, 1, 8, 0, 0, 0, 0, 2, 2, 7, 0, 0,
+		0, 0, 2, 4, 7, 0, 0, 0, 0, 2, 1, 6, 0, 0, 0, 0,
+		2, 2, 5, 0, 0, 0, 0, 3, 4, 5, 105, 110, 116, 0, 2, 8,
+		5, 0, 0, 0, 0, 2, 8, 7, 0, 0, 0, 0, 4, 8, 114, 0,
+		0, 0, 2, 1, 6, 0, 0, 0, 0, 5, 0, 0, 0, 0, 1, 4,
+		0, 0, 0, 0, 0, 0, 0, 0, 27, 0, 0, 0, 0, 0, 0, 0,
+		1, 156, 179, 0, 0, 0, 6, 0, 0, 0, 0, 1, 4, 87, 0, 0,
+		0, 2, 145, 108, 6, 0, 0, 0, 0, 1, 4, 179, 0, 0, 0, 2,
+		145, 96, 0, 4, 8, 108, 0, 0, 0, 0,
+	}
+
+	// Test Data method.
+	b, err := sec.Data()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !bytes.Equal(wantData, b) {
+		t.Fatalf("want data %x, got %x", wantData, b)
+	}
+
+	// Test Open method and seeking.
+	buf, have, count := make([]byte, len(b)), make([]bool, len(b)), 0
+	sf := sec.Open()
+	if got, err := sf.Seek(0, io.SeekEnd); got != int64(len(b)) || err != nil {
+		t.Fatalf("want seek end %d, got %d error %v", len(b), got, err)
+	}
+	if n, err := sf.Read(buf); n != 0 || err != io.EOF {
+		t.Fatalf("want EOF with 0 bytes, got %v with %d bytes", err, n)
+	}
+	pos := int64(len(buf))
+	for count < len(buf) {
+		// Construct random seek arguments.
+		whence := rand.Intn(3)
+		target := rand.Int63n(int64(len(buf)))
+		var offset int64
+		switch whence {
+		case io.SeekStart:
+			offset = target
+		case io.SeekCurrent:
+			offset = target - pos
+		case io.SeekEnd:
+			offset = target - int64(len(buf))
+		}
+		pos, err = sf.Seek(offset, whence)
+		if err != nil {
+			t.Fatal(err)
+		}
+		if pos != target {
+			t.Fatalf("want position %d, got %d", target, pos)
+		}
+
+		// Read data from the new position.
+		end := pos + 16
+		if end > int64(len(buf)) {
+			end = int64(len(buf))
+		}
+		n, err := io.ReadFull(sf, buf[pos:end])
+		if err != nil {
+			t.Fatal(err)
+		}
+		for i := 0; i < n; i++ {
+			if !have[pos] {
+				have[pos] = true
+				count++
+			}
+			pos++
+		}
+	}
+	if !bytes.Equal(wantData, buf) {
+		t.Fatalf("want data %x, got %x", wantData, buf)
+	}
+}
+
+func TestNoSectionOverlaps(t *testing.T) {
+	// Ensure cmd/link outputs sections without overlaps.
+	switch runtime.GOOS {
+	case "aix", "android", "darwin", "ios", "js", "plan9", "windows":
+		t.Skipf("cmd/link doesn't produce ELF binaries on %s", runtime.GOOS)
+	}
+	_ = net.ResolveIPAddr // force dynamic linkage
+	f, err := Open(os.Args[0])
+	if err != nil {
+		t.Error(err)
+		return
+	}
+	for i, si := range f.Sections {
+		sih := si.SectionHeader
+		if sih.Type == SHT_NOBITS {
+			continue
+		}
+		for j, sj := range f.Sections {
+			sjh := sj.SectionHeader
+			if i == j || sjh.Type == SHT_NOBITS || sih.Offset == sjh.Offset && sih.Size == 0 {
+				continue
+			}
+			if sih.Offset >= sjh.Offset && sih.Offset < sjh.Offset+sjh.Size {
+				t.Errorf("ld produced ELF with section %s within %s: 0x%x <= 0x%x..0x%x < 0x%x",
+					sih.Name, sjh.Name, sjh.Offset, sih.Offset, sih.Offset+sih.Size, sjh.Offset+sjh.Size)
+			}
+		}
+	}
+}
+
+func TestIssue10996(t *testing.T) {
+	data := []byte("\u007fELF\x02\x01\x010000000000000" +
+		"\x010000000000000000000" +
+		"\x00\x00\x00\x00\x00\x00\x00\x0000000000\x00\x00\x00\x00" +
+		"0000")
+	_, err := NewFile(bytes.NewReader(data))
+	if err == nil {
+		t.Fatalf("opening invalid ELF file unexpectedly succeeded")
+	}
+}
diff --git a/src/debug/elf/reader.go b/src/debug/elf/reader.go
new file mode 100644
index 0000000..a458436
--- /dev/null
+++ b/src/debug/elf/reader.go
@@ -0,0 +1,108 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package elf
+
+import (
+	"io"
+	"os"
+)
+
+// errorReader returns error from all operations.
+type errorReader struct {
+	error
+}
+
+func (r errorReader) Read(p []byte) (n int, err error) {
+	return 0, r.error
+}
+
+func (r errorReader) ReadAt(p []byte, off int64) (n int, err error) {
+	return 0, r.error
+}
+
+func (r errorReader) Seek(offset int64, whence int) (int64, error) {
+	return 0, r.error
+}
+
+func (r errorReader) Close() error {
+	return r.error
+}
+
+// readSeekerFromReader converts an io.Reader into an io.ReadSeeker.
+// In general Seek may not be efficient, but it is optimized for
+// common cases such as seeking to the end to find the length of the
+// data.
+type readSeekerFromReader struct {
+	reset  func() (io.Reader, error)
+	r      io.Reader
+	size   int64
+	offset int64
+}
+
+func (r *readSeekerFromReader) start() {
+	x, err := r.reset()
+	if err != nil {
+		r.r = errorReader{err}
+	} else {
+		r.r = x
+	}
+	r.offset = 0
+}
+
+func (r *readSeekerFromReader) Read(p []byte) (n int, err error) {
+	if r.r == nil {
+		r.start()
+	}
+	n, err = r.r.Read(p)
+	r.offset += int64(n)
+	return n, err
+}
+
+func (r *readSeekerFromReader) Seek(offset int64, whence int) (int64, error) {
+	var newOffset int64
+	switch whence {
+	case seekStart:
+		newOffset = offset
+	case seekCurrent:
+		newOffset = r.offset + offset
+	case seekEnd:
+		newOffset = r.size + offset
+	default:
+		return 0, os.ErrInvalid
+	}
+
+	switch {
+	case newOffset == r.offset:
+		return newOffset, nil
+
+	case newOffset < 0, newOffset > r.size:
+		return 0, os.ErrInvalid
+
+	case newOffset == 0:
+		r.r = nil
+
+	case newOffset == r.size:
+		r.r = errorReader{io.EOF}
+
+	default:
+		if newOffset < r.offset {
+			// Restart at the beginning.
+			r.start()
+		}
+		// Read until we reach offset.
+		var buf [512]byte
+		for r.offset < newOffset {
+			b := buf[:]
+			if newOffset-r.offset < int64(len(buf)) {
+				b = buf[:newOffset-r.offset]
+			}
+			if _, err := r.Read(b); err != nil {
+				return 0, err
+			}
+		}
+	}
+	r.offset = newOffset
+	return r.offset, nil
+}
diff --git a/src/debug/elf/symbols_test.go b/src/debug/elf/symbols_test.go
new file mode 100644
index 0000000..42f0231
--- /dev/null
+++ b/src/debug/elf/symbols_test.go
@@ -0,0 +1,838 @@
+// Copyright 2014 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package elf
+
+import (
+	"io"
+	"path"
+	"reflect"
+	"testing"
+)
+
+// TODO: remove duplicate code
+func TestSymbols(t *testing.T) {
+	do := func(file string, ts []Symbol, getfunc func(*File) ([]Symbol, error)) {
+		var f *File
+		var err error
+		if path.Ext(file) == ".gz" {
+			var r io.ReaderAt
+			if r, err = decompress(file); err == nil {
+				f, err = NewFile(r)
+			}
+		} else {
+			f, err = Open(file)
+		}
+		if err != nil {
+			t.Errorf("TestSymbols: cannot open file %s: %v", file, err)
+			return
+		}
+		defer f.Close()
+		fs, err := getfunc(f)
+		if err != nil && err != ErrNoSymbols {
+			t.Error(err)
+			return
+		} else if err == ErrNoSymbols {
+			fs = []Symbol{}
+		}
+		if !reflect.DeepEqual(ts, fs) {
+			t.Errorf("%s: Symbols = %v, want %v", file, ts, fs)
+		}
+	}
+	for file, ts := range symbolsGolden {
+		do(file, ts, (*File).Symbols)
+	}
+	for file, ts := range dynamicSymbolsGolden {
+		do(file, ts, (*File).DynamicSymbols)
+	}
+}
+
+// golden symbol table data generated by testdata/getgoldsym.c
+
+var symbolsGolden = map[string][]Symbol{
+	"testdata/gcc-amd64-linux-exec": {
+		Symbol{
+			Name:    "",
+			Info:    0x3,
+			Other:   0x0,
+			Section: 0x1,
+			Value:   0x400200,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "",
+			Info:    0x3,
+			Other:   0x0,
+			Section: 0x2,
+			Value:   0x40021C,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "",
+			Info:    0x3,
+			Other:   0x0,
+			Section: 0x3,
+			Value:   0x400240,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "",
+			Info:    0x3,
+			Other:   0x0,
+			Section: 0x4,
+			Value:   0x400268,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "",
+			Info:    0x3,
+			Other:   0x0,
+			Section: 0x5,
+			Value:   0x400288,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "",
+			Info:    0x3,
+			Other:   0x0,
+			Section: 0x6,
+			Value:   0x4002E8,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "",
+			Info:    0x3,
+			Other:   0x0,
+			Section: 0x7,
+			Value:   0x400326,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "",
+			Info:    0x3,
+			Other:   0x0,
+			Section: 0x8,
+			Value:   0x400330,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "",
+			Info:    0x3,
+			Other:   0x0,
+			Section: 0x9,
+			Value:   0x400350,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "",
+			Info:    0x3,
+			Other:   0x0,
+			Section: 0xA,
+			Value:   0x400368,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "",
+			Info:    0x3,
+			Other:   0x0,
+			Section: 0xB,
+			Value:   0x400398,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "",
+			Info:    0x3,
+			Other:   0x0,
+			Section: 0xC,
+			Value:   0x4003B0,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "",
+			Info:    0x3,
+			Other:   0x0,
+			Section: 0xD,
+			Value:   0x4003E0,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "",
+			Info:    0x3,
+			Other:   0x0,
+			Section: 0xE,
+			Value:   0x400594,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "",
+			Info:    0x3,
+			Other:   0x0,
+			Section: 0xF,
+			Value:   0x4005A4,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "",
+			Info:    0x3,
+			Other:   0x0,
+			Section: 0x10,
+			Value:   0x4005B8,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "",
+			Info:    0x3,
+			Other:   0x0,
+			Section: 0x11,
+			Value:   0x4005E0,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "",
+			Info:    0x3,
+			Other:   0x0,
+			Section: 0x12,
+			Value:   0x600688,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "",
+			Info:    0x3,
+			Other:   0x0,
+			Section: 0x13,
+			Value:   0x600698,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "",
+			Info:    0x3,
+			Other:   0x0,
+			Section: 0x14,
+			Value:   0x6006A8,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "",
+			Info:    0x3,
+			Other:   0x0,
+			Section: 0x15,
+			Value:   0x6006B0,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "",
+			Info:    0x3,
+			Other:   0x0,
+			Section: 0x16,
+			Value:   0x600850,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "",
+			Info:    0x3,
+			Other:   0x0,
+			Section: 0x17,
+			Value:   0x600858,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "",
+			Info:    0x3,
+			Other:   0x0,
+			Section: 0x18,
+			Value:   0x600880,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "",
+			Info:    0x3,
+			Other:   0x0,
+			Section: 0x19,
+			Value:   0x600898,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "",
+			Info:    0x3,
+			Other:   0x0,
+			Section: 0x1A,
+			Value:   0x0,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "",
+			Info:    0x3,
+			Other:   0x0,
+			Section: 0x1B,
+			Value:   0x0,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "",
+			Info:    0x3,
+			Other:   0x0,
+			Section: 0x1C,
+			Value:   0x0,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "",
+			Info:    0x3,
+			Other:   0x0,
+			Section: 0x1D,
+			Value:   0x0,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "",
+			Info:    0x3,
+			Other:   0x0,
+			Section: 0x1E,
+			Value:   0x0,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "",
+			Info:    0x3,
+			Other:   0x0,
+			Section: 0x1F,
+			Value:   0x0,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "",
+			Info:    0x3,
+			Other:   0x0,
+			Section: 0x20,
+			Value:   0x0,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "",
+			Info:    0x3,
+			Other:   0x0,
+			Section: 0x21,
+			Value:   0x0,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "init.c",
+			Info:    0x4,
+			Other:   0x0,
+			Section: 0xFFF1,
+			Value:   0x0,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "initfini.c",
+			Info:    0x4,
+			Other:   0x0,
+			Section: 0xFFF1,
+			Value:   0x0,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "call_gmon_start",
+			Info:    0x2,
+			Other:   0x0,
+			Section: 0xD,
+			Value:   0x40040C,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "crtstuff.c",
+			Info:    0x4,
+			Other:   0x0,
+			Section: 0xFFF1,
+			Value:   0x0,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "__CTOR_LIST__",
+			Info:    0x1,
+			Other:   0x0,
+			Section: 0x12,
+			Value:   0x600688,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "__DTOR_LIST__",
+			Info:    0x1,
+			Other:   0x0,
+			Section: 0x13,
+			Value:   0x600698,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "__JCR_LIST__",
+			Info:    0x1,
+			Other:   0x0,
+			Section: 0x14,
+			Value:   0x6006A8,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "__do_global_dtors_aux",
+			Info:    0x2,
+			Other:   0x0,
+			Section: 0xD,
+			Value:   0x400430,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "completed.6183",
+			Info:    0x1,
+			Other:   0x0,
+			Section: 0x19,
+			Value:   0x600898,
+			Size:    0x1,
+		},
+		Symbol{
+			Name:    "p.6181",
+			Info:    0x1,
+			Other:   0x0,
+			Section: 0x18,
+			Value:   0x600890,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "frame_dummy",
+			Info:    0x2,
+			Other:   0x0,
+			Section: 0xD,
+			Value:   0x400470,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "crtstuff.c",
+			Info:    0x4,
+			Other:   0x0,
+			Section: 0xFFF1,
+			Value:   0x0,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "__CTOR_END__",
+			Info:    0x1,
+			Other:   0x0,
+			Section: 0x12,
+			Value:   0x600690,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "__DTOR_END__",
+			Info:    0x1,
+			Other:   0x0,
+			Section: 0x13,
+			Value:   0x6006A0,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "__FRAME_END__",
+			Info:    0x1,
+			Other:   0x0,
+			Section: 0x11,
+			Value:   0x400680,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "__JCR_END__",
+			Info:    0x1,
+			Other:   0x0,
+			Section: 0x14,
+			Value:   0x6006A8,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "__do_global_ctors_aux",
+			Info:    0x2,
+			Other:   0x0,
+			Section: 0xD,
+			Value:   0x400560,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "initfini.c",
+			Info:    0x4,
+			Other:   0x0,
+			Section: 0xFFF1,
+			Value:   0x0,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "hello.c",
+			Info:    0x4,
+			Other:   0x0,
+			Section: 0xFFF1,
+			Value:   0x0,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "_GLOBAL_OFFSET_TABLE_",
+			Info:    0x1,
+			Other:   0x2,
+			Section: 0x17,
+			Value:   0x600858,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "__init_array_end",
+			Info:    0x0,
+			Other:   0x2,
+			Section: 0x12,
+			Value:   0x600684,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "__init_array_start",
+			Info:    0x0,
+			Other:   0x2,
+			Section: 0x12,
+			Value:   0x600684,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "_DYNAMIC",
+			Info:    0x1,
+			Other:   0x2,
+			Section: 0x15,
+			Value:   0x6006B0,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "data_start",
+			Info:    0x20,
+			Other:   0x0,
+			Section: 0x18,
+			Value:   0x600880,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "__libc_csu_fini",
+			Info:    0x12,
+			Other:   0x0,
+			Section: 0xD,
+			Value:   0x4004C0,
+			Size:    0x2,
+		},
+		Symbol{
+			Name:    "_start",
+			Info:    0x12,
+			Other:   0x0,
+			Section: 0xD,
+			Value:   0x4003E0,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "__gmon_start__",
+			Info:    0x20,
+			Other:   0x0,
+			Section: 0x0,
+			Value:   0x0,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "_Jv_RegisterClasses",
+			Info:    0x20,
+			Other:   0x0,
+			Section: 0x0,
+			Value:   0x0,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "puts@@GLIBC_2.2.5",
+			Info:    0x12,
+			Other:   0x0,
+			Section: 0x0,
+			Value:   0x0,
+			Size:    0x18C,
+		},
+		Symbol{
+			Name:    "_fini",
+			Info:    0x12,
+			Other:   0x0,
+			Section: 0xE,
+			Value:   0x400594,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "__libc_start_main@@GLIBC_2.2.5",
+			Info:    0x12,
+			Other:   0x0,
+			Section: 0x0,
+			Value:   0x0,
+			Size:    0x1C2,
+		},
+		Symbol{
+			Name:    "_IO_stdin_used",
+			Info:    0x11,
+			Other:   0x0,
+			Section: 0xF,
+			Value:   0x4005A4,
+			Size:    0x4,
+		},
+		Symbol{
+			Name:    "__data_start",
+			Info:    0x10,
+			Other:   0x0,
+			Section: 0x18,
+			Value:   0x600880,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "__dso_handle",
+			Info:    0x11,
+			Other:   0x2,
+			Section: 0x18,
+			Value:   0x600888,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "__libc_csu_init",
+			Info:    0x12,
+			Other:   0x0,
+			Section: 0xD,
+			Value:   0x4004D0,
+			Size:    0x89,
+		},
+		Symbol{
+			Name:    "__bss_start",
+			Info:    0x10,
+			Other:   0x0,
+			Section: 0xFFF1,
+			Value:   0x600898,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "_end",
+			Info:    0x10,
+			Other:   0x0,
+			Section: 0xFFF1,
+			Value:   0x6008A0,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "_edata",
+			Info:    0x10,
+			Other:   0x0,
+			Section: 0xFFF1,
+			Value:   0x600898,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "main",
+			Info:    0x12,
+			Other:   0x0,
+			Section: 0xD,
+			Value:   0x400498,
+			Size:    0x1B,
+		},
+		Symbol{
+			Name:    "_init",
+			Info:    0x12,
+			Other:   0x0,
+			Section: 0xB,
+			Value:   0x400398,
+			Size:    0x0,
+		},
+	},
+	"testdata/go-relocation-test-clang-x86.obj": {
+		Symbol{
+			Name:    "go-relocation-test-clang.c",
+			Info:    0x4,
+			Other:   0x0,
+			Section: 0xFFF1,
+			Value:   0x0,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    ".Linfo_string0",
+			Info:    0x0,
+			Other:   0x0,
+			Section: 0xC,
+			Value:   0x0,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    ".Linfo_string1",
+			Info:    0x0,
+			Other:   0x0,
+			Section: 0xC,
+			Value:   0x2C,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    ".Linfo_string2",
+			Info:    0x0,
+			Other:   0x0,
+			Section: 0xC,
+			Value:   0x47,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    ".Linfo_string3",
+			Info:    0x0,
+			Other:   0x0,
+			Section: 0xC,
+			Value:   0x4C,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    ".Linfo_string4",
+			Info:    0x0,
+			Other:   0x0,
+			Section: 0xC,
+			Value:   0x4E,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "",
+			Info:    0x3,
+			Other:   0x0,
+			Section: 0x1,
+			Value:   0x0,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "",
+			Info:    0x3,
+			Other:   0x0,
+			Section: 0x2,
+			Value:   0x0,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "",
+			Info:    0x3,
+			Other:   0x0,
+			Section: 0x3,
+			Value:   0x0,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "",
+			Info:    0x3,
+			Other:   0x0,
+			Section: 0x4,
+			Value:   0x0,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "",
+			Info:    0x3,
+			Other:   0x0,
+			Section: 0x6,
+			Value:   0x0,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "",
+			Info:    0x3,
+			Other:   0x0,
+			Section: 0x7,
+			Value:   0x0,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "",
+			Info:    0x3,
+			Other:   0x0,
+			Section: 0x8,
+			Value:   0x0,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "",
+			Info:    0x3,
+			Other:   0x0,
+			Section: 0xA,
+			Value:   0x0,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "",
+			Info:    0x3,
+			Other:   0x0,
+			Section: 0xC,
+			Value:   0x0,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "",
+			Info:    0x3,
+			Other:   0x0,
+			Section: 0xD,
+			Value:   0x0,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "",
+			Info:    0x3,
+			Other:   0x0,
+			Section: 0xE,
+			Value:   0x0,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "",
+			Info:    0x3,
+			Other:   0x0,
+			Section: 0xF,
+			Value:   0x0,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "",
+			Info:    0x3,
+			Other:   0x0,
+			Section: 0x10,
+			Value:   0x0,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "v",
+			Info:    0x11,
+			Other:   0x0,
+			Section: 0xFFF2,
+			Value:   0x4,
+			Size:    0x4,
+		},
+	},
+	"testdata/hello-world-core.gz": {},
+}
+
+var dynamicSymbolsGolden = map[string][]Symbol{
+	"testdata/gcc-amd64-linux-exec": {
+		Symbol{
+			Name:    "__gmon_start__",
+			Info:    0x20,
+			Other:   0x0,
+			Section: 0x0,
+			Value:   0x0,
+			Size:    0x0,
+		},
+		Symbol{
+			Name:    "puts",
+			Info:    0x12,
+			Other:   0x0,
+			Section: 0x0,
+			Value:   0x0,
+			Size:    0x18C,
+			Version: "GLIBC_2.2.5",
+			Library: "libc.so.6",
+		},
+		Symbol{
+			Name:    "__libc_start_main",
+			Info:    0x12,
+			Other:   0x0,
+			Section: 0x0,
+			Value:   0x0,
+			Size:    0x1C2,
+			Version: "GLIBC_2.2.5",
+			Library: "libc.so.6",
+		},
+	},
+	"testdata/go-relocation-test-clang-x86.obj": {},
+	"testdata/hello-world-core.gz":              {},
+}
diff --git a/src/debug/elf/testdata/compressed-32.obj b/src/debug/elf/testdata/compressed-32.obj
new file mode 100644
index 0000000..2bfdb44
--- /dev/null
+++ b/src/debug/elf/testdata/compressed-32.obj
diff --git a/src/debug/elf/testdata/compressed-64.obj b/src/debug/elf/testdata/compressed-64.obj
new file mode 100644
index 0000000..ffae56a
--- /dev/null
+++ b/src/debug/elf/testdata/compressed-64.obj
diff --git a/src/debug/elf/testdata/gcc-386-freebsd-exec b/src/debug/elf/testdata/gcc-386-freebsd-exec
new file mode 100644
index 0000000..7af9c58
--- /dev/null
+++ b/src/debug/elf/testdata/gcc-386-freebsd-exec
diff --git a/src/debug/elf/testdata/gcc-amd64-linux-exec b/src/debug/elf/testdata/gcc-amd64-linux-exec
new file mode 100644
index 0000000..c6cb1de
--- /dev/null
+++ b/src/debug/elf/testdata/gcc-amd64-linux-exec
diff --git a/src/debug/elf/testdata/gcc-amd64-openbsd-debug-with-rela.obj b/src/debug/elf/testdata/gcc-amd64-openbsd-debug-with-rela.obj
new file mode 100644
index 0000000..f62b1ea
--- /dev/null
+++ b/src/debug/elf/testdata/gcc-amd64-openbsd-debug-with-rela.obj
diff --git a/src/debug/elf/testdata/go-relocation-test-clang-arm.obj b/src/debug/elf/testdata/go-relocation-test-clang-arm.obj
new file mode 100644
index 0000000..1cc7e4b
--- /dev/null
+++ b/src/debug/elf/testdata/go-relocation-test-clang-arm.obj
diff --git a/src/debug/elf/testdata/go-relocation-test-clang-x86.obj b/src/debug/elf/testdata/go-relocation-test-clang-x86.obj
new file mode 100644
index 0000000..e909cf4
--- /dev/null
+++ b/src/debug/elf/testdata/go-relocation-test-clang-x86.obj
diff --git a/src/debug/elf/testdata/go-relocation-test-gcc424-x86-64.obj b/src/debug/elf/testdata/go-relocation-test-gcc424-x86-64.obj
new file mode 100644
index 0000000..a7c6d6e
--- /dev/null
+++ b/src/debug/elf/testdata/go-relocation-test-gcc424-x86-64.obj
diff --git a/src/debug/elf/testdata/go-relocation-test-gcc441-x86-64.obj b/src/debug/elf/testdata/go-relocation-test-gcc441-x86-64.obj
new file mode 100644
index 0000000..2d37ab6
--- /dev/null
+++ b/src/debug/elf/testdata/go-relocation-test-gcc441-x86-64.obj
diff --git a/src/debug/elf/testdata/go-relocation-test-gcc441-x86.obj b/src/debug/elf/testdata/go-relocation-test-gcc441-x86.obj
new file mode 100644
index 0000000..0d59fe3
--- /dev/null
+++ b/src/debug/elf/testdata/go-relocation-test-gcc441-x86.obj
diff --git a/src/debug/elf/testdata/go-relocation-test-gcc482-aarch64.obj b/src/debug/elf/testdata/go-relocation-test-gcc482-aarch64.obj
new file mode 100644
index 0000000..849e264
--- /dev/null
+++ b/src/debug/elf/testdata/go-relocation-test-gcc482-aarch64.obj
diff --git a/src/debug/elf/testdata/go-relocation-test-gcc482-ppc64le.obj b/src/debug/elf/testdata/go-relocation-test-gcc482-ppc64le.obj
new file mode 100644
index 0000000..dad7445
--- /dev/null
+++ b/src/debug/elf/testdata/go-relocation-test-gcc482-ppc64le.obj
diff --git a/src/debug/elf/testdata/go-relocation-test-gcc492-arm.obj b/src/debug/elf/testdata/go-relocation-test-gcc492-arm.obj
new file mode 100644
index 0000000..ed45be2
--- /dev/null
+++ b/src/debug/elf/testdata/go-relocation-test-gcc492-arm.obj
diff --git a/src/debug/elf/testdata/go-relocation-test-gcc492-mips64.obj b/src/debug/elf/testdata/go-relocation-test-gcc492-mips64.obj
new file mode 100644
index 0000000..68febe1
--- /dev/null
+++ b/src/debug/elf/testdata/go-relocation-test-gcc492-mips64.obj
diff --git a/src/debug/elf/testdata/go-relocation-test-gcc492-mipsle.obj b/src/debug/elf/testdata/go-relocation-test-gcc492-mipsle.obj
new file mode 100644
index 0000000..a5fbcfb
--- /dev/null
+++ b/src/debug/elf/testdata/go-relocation-test-gcc492-mipsle.obj
diff --git a/src/debug/elf/testdata/go-relocation-test-gcc493-mips64le.obj b/src/debug/elf/testdata/go-relocation-test-gcc493-mips64le.obj
new file mode 100644
index 0000000..20bbd6c
--- /dev/null
+++ b/src/debug/elf/testdata/go-relocation-test-gcc493-mips64le.obj
diff --git a/src/debug/elf/testdata/go-relocation-test-gcc5-ppc.obj b/src/debug/elf/testdata/go-relocation-test-gcc5-ppc.obj
new file mode 100644
index 0000000..f4165af
--- /dev/null
+++ b/src/debug/elf/testdata/go-relocation-test-gcc5-ppc.obj
diff --git a/src/debug/elf/testdata/go-relocation-test-gcc531-s390x.obj b/src/debug/elf/testdata/go-relocation-test-gcc531-s390x.obj
new file mode 100644
index 0000000..caacb9b
--- /dev/null
+++ b/src/debug/elf/testdata/go-relocation-test-gcc531-s390x.obj
diff --git a/src/debug/elf/testdata/go-relocation-test-gcc540-mips.obj b/src/debug/elf/testdata/go-relocation-test-gcc540-mips.obj
new file mode 100644
index 0000000..270c777
--- /dev/null
+++ b/src/debug/elf/testdata/go-relocation-test-gcc540-mips.obj
diff --git a/src/debug/elf/testdata/go-relocation-test-gcc620-sparc64.obj b/src/debug/elf/testdata/go-relocation-test-gcc620-sparc64.obj
new file mode 100644
index 0000000..d65c23e
--- /dev/null
+++ b/src/debug/elf/testdata/go-relocation-test-gcc620-sparc64.obj
diff --git a/src/debug/elf/testdata/go-relocation-test-gcc720-riscv64.obj b/src/debug/elf/testdata/go-relocation-test-gcc720-riscv64.obj
new file mode 100644
index 0000000..91ae648
--- /dev/null
+++ b/src/debug/elf/testdata/go-relocation-test-gcc720-riscv64.obj
diff --git a/src/debug/elf/testdata/go-relocation-test-gcc930-ranges-no-rela-x86-64 b/src/debug/elf/testdata/go-relocation-test-gcc930-ranges-no-rela-x86-64
new file mode 100644
index 0000000..c013f3e
--- /dev/null
+++ b/src/debug/elf/testdata/go-relocation-test-gcc930-ranges-no-rela-x86-64
diff --git a/src/debug/elf/testdata/go-relocation-test-gcc930-ranges-with-rela-x86-64 b/src/debug/elf/testdata/go-relocation-test-gcc930-ranges-with-rela-x86-64
new file mode 100644
index 0000000..51e03aa
--- /dev/null
+++ b/src/debug/elf/testdata/go-relocation-test-gcc930-ranges-with-rela-x86-64
diff --git a/src/debug/elf/testdata/hello-world-core.gz b/src/debug/elf/testdata/hello-world-core.gz
new file mode 100644
index 0000000..6d76ab0
--- /dev/null
+++ b/src/debug/elf/testdata/hello-world-core.gz
diff --git a/src/debug/elf/testdata/hello.c b/src/debug/elf/testdata/hello.c
new file mode 100644
index 0000000..34d9ee7
--- /dev/null
+++ b/src/debug/elf/testdata/hello.c
@@ -0,0 +1,7 @@
+#include <stdio.h>
+
+void
+main(int argc, char *argv[])
+{
+	printf("hello, world\n");
+}
diff --git a/src/debug/elf/testdata/multiple-code-sections.c b/src/debug/elf/testdata/multiple-code-sections.c
new file mode 100644
index 0000000..03b9d53
--- /dev/null
+++ b/src/debug/elf/testdata/multiple-code-sections.c
@@ -0,0 +1,28 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Build with:
+// gcc -g multiple-code-sections.c -Wl,--emit-relocs -Wl,--discard-none -Wl,-zmax-page-size=1 -fno-asynchronous-unwind-tables -o go-relocation-test-gcc930-ranges-with-rela-x86-64
+// gcc -g multiple-code-sections.c -Wl,-zmax-page-size=1 -fno-asynchronous-unwind-tables -o go-relocation-test-gcc930-ranges-no-rela-x86-64
+// Strip with:
+// strip --only-keep-debug \
+//       --remove-section=.eh_frame \
+//       --remove-section=.eh_frame_hdr \
+//       --remove-section=.shstrtab \
+//       --remove-section=.strtab \
+//       --remove-section=.symtab \
+//       --remove-section=.note.gnu.build-id \
+//       --remove-section=.note.ABI-tag \
+//       --remove-section=.dynamic \
+//       --remove-section=.gnu.hash \
+//       --remove-section=.interp \
+//       --remove-section=.rodata
+__attribute__((section(".separate_section"))) // To get GCC to emit a DW_AT_ranges attribute for the CU.
+int func(void) {
+    return 0;
+}
+
+int main(int argc, char *argv[]) {
+    return 0;
+}
diff --git a/src/debug/elf/testdata/zdebug-test-gcc484-x86-64.obj b/src/debug/elf/testdata/zdebug-test-gcc484-x86-64.obj
new file mode 100644
index 0000000..a595a01
--- /dev/null
+++ b/src/debug/elf/testdata/zdebug-test-gcc484-x86-64.obj
diff --git a/src/debug/gosym/pclntab.go b/src/debug/gosym/pclntab.go
new file mode 100644
index 0000000..a72f984
--- /dev/null
+++ b/src/debug/gosym/pclntab.go
@@ -0,0 +1,561 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+/*
+ * Line tables
+ */
+
+package gosym
+
+import (
+	"bytes"
+	"encoding/binary"
+	"sync"
+)
+
+// version of the pclntab
+type version int
+
+const (
+	verUnknown version = iota
+	ver11
+	ver12
+	ver116
+)
+
+// A LineTable is a data structure mapping program counters to line numbers.
+//
+// In Go 1.1 and earlier, each function (represented by a Func) had its own LineTable,
+// and the line number corresponded to a numbering of all source lines in the
+// program, across all files. That absolute line number would then have to be
+// converted separately to a file name and line number within the file.
+//
+// In Go 1.2, the format of the data changed so that there is a single LineTable
+// for the entire program, shared by all Funcs, and there are no absolute line
+// numbers, just line numbers within specific files.
+//
+// For the most part, LineTable's methods should be treated as an internal
+// detail of the package; callers should use the methods on Table instead.
+type LineTable struct {
+	Data []byte
+	PC   uint64
+	Line int
+
+	// This mutex is used to keep parsing of pclntab synchronous.
+	mu sync.Mutex
+
+	// Contains the version of the pclntab section.
+	version version
+
+	// Go 1.2/1.16 state
+	binary      binary.ByteOrder
+	quantum     uint32
+	ptrsize     uint32
+	funcnametab []byte
+	cutab       []byte
+	funcdata    []byte
+	functab     []byte
+	nfunctab    uint32
+	filetab     []byte
+	pctab       []byte // points to the pctables.
+	nfiletab    uint32
+	funcNames   map[uint32]string // cache the function names
+	strings     map[uint32]string // interned substrings of Data, keyed by offset
+	// fileMap varies depending on the version of the object file.
+	// For ver12, it maps the name to the index in the file table.
+	// For ver116, it maps the name to the offset in filetab.
+	fileMap map[string]uint32
+}
+
+// NOTE(rsc): This is wrong for GOARCH=arm, which uses a quantum of 4,
+// but we have no idea whether we're using arm or not. This only
+// matters in the old (pre-Go 1.2) symbol table format, so it's not worth
+// fixing.
+const oldQuantum = 1
+
+func (t *LineTable) parse(targetPC uint64, targetLine int) (b []byte, pc uint64, line int) {
+	// The PC/line table can be thought of as a sequence of
+	//  <pc update>* <line update>
+	// batches. Each update batch results in a (pc, line) pair,
+	// where line applies to every PC from pc up to but not
+	// including the pc of the next pair.
+	//
+	// Here we process each update individually, which simplifies
+	// the code, but makes the corner cases more confusing.
+	b, pc, line = t.Data, t.PC, t.Line
+	for pc <= targetPC && line != targetLine && len(b) > 0 {
+		code := b[0]
+		b = b[1:]
+		switch {
+		case code == 0:
+			if len(b) < 4 {
+				b = b[0:0]
+				break
+			}
+			val := binary.BigEndian.Uint32(b)
+			b = b[4:]
+			line += int(val)
+		case code <= 64:
+			line += int(code)
+		case code <= 128:
+			line -= int(code - 64)
+		default:
+			pc += oldQuantum * uint64(code-128)
+			continue
+		}
+		pc += oldQuantum
+	}
+	return b, pc, line
+}
+
+func (t *LineTable) slice(pc uint64) *LineTable {
+	data, pc, line := t.parse(pc, -1)
+	return &LineTable{Data: data, PC: pc, Line: line}
+}
+
+// PCToLine returns the line number for the given program counter.
+//
+// Deprecated: Use Table's PCToLine method instead.
+func (t *LineTable) PCToLine(pc uint64) int {
+	if t.isGo12() {
+		return t.go12PCToLine(pc)
+	}
+	_, _, line := t.parse(pc, -1)
+	return line
+}
+
+// LineToPC returns the program counter for the given line number,
+// considering only program counters before maxpc.
+//
+// Deprecated: Use Table's LineToPC method instead.
+func (t *LineTable) LineToPC(line int, maxpc uint64) uint64 {
+	if t.isGo12() {
+		return 0
+	}
+	_, pc, line1 := t.parse(maxpc, line)
+	if line1 != line {
+		return 0
+	}
+	// Subtract quantum from PC to account for post-line increment
+	return pc - oldQuantum
+}
+
+// NewLineTable returns a new PC/line table
+// corresponding to the encoded data.
+// Text must be the start address of the
+// corresponding text segment.
+func NewLineTable(data []byte, text uint64) *LineTable {
+	return &LineTable{Data: data, PC: text, Line: 0, funcNames: make(map[uint32]string), strings: make(map[uint32]string)}
+}
+
+// Go 1.2 symbol table format.
+// See golang.org/s/go12symtab.
+//
+// A general note about the methods here: rather than try to avoid
+// index out of bounds errors, we trust Go to detect them, and then
+// we recover from the panics and treat them as indicative of a malformed
+// or incomplete table.
+//
+// The methods called by symtab.go, which begin with "go12" prefixes,
+// are expected to have that recovery logic.
+
+// isGo12 reports whether this is a Go 1.2 (or later) symbol table.
+func (t *LineTable) isGo12() bool {
+	t.parsePclnTab()
+	return t.version >= ver12
+}
+
+const go12magic = 0xfffffffb
+const go116magic = 0xfffffffa
+
+// uintptr returns the pointer-sized value encoded at b.
+// The pointer size is dictated by the table being read.
+func (t *LineTable) uintptr(b []byte) uint64 {
+	if t.ptrsize == 4 {
+		return uint64(t.binary.Uint32(b))
+	}
+	return t.binary.Uint64(b)
+}
+
+// parsePclnTab parses the pclntab, setting the version.
+func (t *LineTable) parsePclnTab() {
+	t.mu.Lock()
+	defer t.mu.Unlock()
+	if t.version != verUnknown {
+		return
+	}
+
+	// Note that during this function, setting the version is the last thing we do.
+	// If we set the version too early, and parsing failed (likely as a panic on
+	// slice lookups), we'd have a mistaken version.
+	//
+	// Error paths through this code will default the version to 1.1.
+	t.version = ver11
+
+	defer func() {
+		// If we panic parsing, assume it's a Go 1.1 pclntab.
+		recover()
+	}()
+
+	// Check header: 4-byte magic, two zeros, pc quantum, pointer size.
+	if len(t.Data) < 16 || t.Data[4] != 0 || t.Data[5] != 0 ||
+		(t.Data[6] != 1 && t.Data[6] != 2 && t.Data[6] != 4) || // pc quantum
+		(t.Data[7] != 4 && t.Data[7] != 8) { // pointer size
+		return
+	}
+
+	var possibleVersion version
+	leMagic := binary.LittleEndian.Uint32(t.Data)
+	beMagic := binary.BigEndian.Uint32(t.Data)
+	switch {
+	case leMagic == go12magic:
+		t.binary, possibleVersion = binary.LittleEndian, ver12
+	case beMagic == go12magic:
+		t.binary, possibleVersion = binary.BigEndian, ver12
+	case leMagic == go116magic:
+		t.binary, possibleVersion = binary.LittleEndian, ver116
+	case beMagic == go116magic:
+		t.binary, possibleVersion = binary.BigEndian, ver116
+	default:
+		return
+	}
+
+	// quantum and ptrSize are the same between 1.2 and 1.16
+	t.quantum = uint32(t.Data[6])
+	t.ptrsize = uint32(t.Data[7])
+
+	switch possibleVersion {
+	case ver116:
+		t.nfunctab = uint32(t.uintptr(t.Data[8:]))
+		t.nfiletab = uint32(t.uintptr(t.Data[8+t.ptrsize:]))
+		offset := t.uintptr(t.Data[8+2*t.ptrsize:])
+		t.funcnametab = t.Data[offset:]
+		offset = t.uintptr(t.Data[8+3*t.ptrsize:])
+		t.cutab = t.Data[offset:]
+		offset = t.uintptr(t.Data[8+4*t.ptrsize:])
+		t.filetab = t.Data[offset:]
+		offset = t.uintptr(t.Data[8+5*t.ptrsize:])
+		t.pctab = t.Data[offset:]
+		offset = t.uintptr(t.Data[8+6*t.ptrsize:])
+		t.funcdata = t.Data[offset:]
+		t.functab = t.Data[offset:]
+		functabsize := t.nfunctab*2*t.ptrsize + t.ptrsize
+		t.functab = t.functab[:functabsize]
+	case ver12:
+		t.nfunctab = uint32(t.uintptr(t.Data[8:]))
+		t.funcdata = t.Data
+		t.funcnametab = t.Data
+		t.functab = t.Data[8+t.ptrsize:]
+		t.pctab = t.Data
+		functabsize := t.nfunctab*2*t.ptrsize + t.ptrsize
+		fileoff := t.binary.Uint32(t.functab[functabsize:])
+		t.functab = t.functab[:functabsize]
+		t.filetab = t.Data[fileoff:]
+		t.nfiletab = t.binary.Uint32(t.filetab)
+		t.filetab = t.filetab[:t.nfiletab*4]
+	default:
+		panic("unreachable")
+	}
+	t.version = possibleVersion
+}
+
+// go12Funcs returns a slice of Funcs derived from the Go 1.2 pcln table.
+func (t *LineTable) go12Funcs() []Func {
+	// Assume it is malformed and return nil on error.
+	defer func() {
+		recover()
+	}()
+
+	n := len(t.functab) / int(t.ptrsize) / 2
+	funcs := make([]Func, n)
+	for i := range funcs {
+		f := &funcs[i]
+		f.Entry = t.uintptr(t.functab[2*i*int(t.ptrsize):])
+		f.End = t.uintptr(t.functab[(2*i+2)*int(t.ptrsize):])
+		info := t.funcdata[t.uintptr(t.functab[(2*i+1)*int(t.ptrsize):]):]
+		f.LineTable = t
+		f.FrameSize = int(t.binary.Uint32(info[t.ptrsize+2*4:]))
+		f.Sym = &Sym{
+			Value:  f.Entry,
+			Type:   'T',
+			Name:   t.funcName(t.binary.Uint32(info[t.ptrsize:])),
+			GoType: 0,
+			Func:   f,
+		}
+	}
+	return funcs
+}
+
+// findFunc returns the func corresponding to the given program counter.
+func (t *LineTable) findFunc(pc uint64) []byte {
+	if pc < t.uintptr(t.functab) || pc >= t.uintptr(t.functab[len(t.functab)-int(t.ptrsize):]) {
+		return nil
+	}
+
+	// The function table is a list of 2*nfunctab+1 uintptrs,
+	// alternating program counters and offsets to func structures.
+	f := t.functab
+	nf := t.nfunctab
+	for nf > 0 {
+		m := nf / 2
+		fm := f[2*t.ptrsize*m:]
+		if t.uintptr(fm) <= pc && pc < t.uintptr(fm[2*t.ptrsize:]) {
+			return t.funcdata[t.uintptr(fm[t.ptrsize:]):]
+		} else if pc < t.uintptr(fm) {
+			nf = m
+		} else {
+			f = f[(m+1)*2*t.ptrsize:]
+			nf -= m + 1
+		}
+	}
+	return nil
+}
+
+// readvarint reads, removes, and returns a varint from *pp.
+func (t *LineTable) readvarint(pp *[]byte) uint32 {
+	var v, shift uint32
+	p := *pp
+	for shift = 0; ; shift += 7 {
+		b := p[0]
+		p = p[1:]
+		v |= (uint32(b) & 0x7F) << shift
+		if b&0x80 == 0 {
+			break
+		}
+	}
+	*pp = p
+	return v
+}
+
+// funcName returns the name of the function found at off.
+func (t *LineTable) funcName(off uint32) string {
+	if s, ok := t.funcNames[off]; ok {
+		return s
+	}
+	i := bytes.IndexByte(t.funcnametab[off:], 0)
+	s := string(t.funcnametab[off : off+uint32(i)])
+	t.funcNames[off] = s
+	return s
+}
+
+// stringFrom returns a Go string found at off from a position.
+func (t *LineTable) stringFrom(arr []byte, off uint32) string {
+	if s, ok := t.strings[off]; ok {
+		return s
+	}
+	i := bytes.IndexByte(arr[off:], 0)
+	s := string(arr[off : off+uint32(i)])
+	t.strings[off] = s
+	return s
+}
+
+// string returns a Go string found at off.
+func (t *LineTable) string(off uint32) string {
+	return t.stringFrom(t.funcdata, off)
+}
+
+// step advances to the next pc, value pair in the encoded table.
+func (t *LineTable) step(p *[]byte, pc *uint64, val *int32, first bool) bool {
+	uvdelta := t.readvarint(p)
+	if uvdelta == 0 && !first {
+		return false
+	}
+	if uvdelta&1 != 0 {
+		uvdelta = ^(uvdelta >> 1)
+	} else {
+		uvdelta >>= 1
+	}
+	vdelta := int32(uvdelta)
+	pcdelta := t.readvarint(p) * t.quantum
+	*pc += uint64(pcdelta)
+	*val += vdelta
+	return true
+}
+
+// pcvalue reports the value associated with the target pc.
+// off is the offset to the beginning of the pc-value table,
+// and entry is the start PC for the corresponding function.
+func (t *LineTable) pcvalue(off uint32, entry, targetpc uint64) int32 {
+	p := t.pctab[off:]
+
+	val := int32(-1)
+	pc := entry
+	for t.step(&p, &pc, &val, pc == entry) {
+		if targetpc < pc {
+			return val
+		}
+	}
+	return -1
+}
+
+// findFileLine scans one function in the binary looking for a
+// program counter in the given file on the given line.
+// It does so by running the pc-value tables mapping program counter
+// to file number. Since most functions come from a single file, these
+// are usually short and quick to scan. If a file match is found, then the
+// code goes to the expense of looking for a simultaneous line number match.
+func (t *LineTable) findFileLine(entry uint64, filetab, linetab uint32, filenum, line int32, cutab []byte) uint64 {
+	if filetab == 0 || linetab == 0 {
+		return 0
+	}
+
+	fp := t.pctab[filetab:]
+	fl := t.pctab[linetab:]
+	fileVal := int32(-1)
+	filePC := entry
+	lineVal := int32(-1)
+	linePC := entry
+	fileStartPC := filePC
+	for t.step(&fp, &filePC, &fileVal, filePC == entry) {
+		fileIndex := fileVal
+		if t.version == ver116 {
+			fileIndex = int32(t.binary.Uint32(cutab[fileVal*4:]))
+		}
+		if fileIndex == filenum && fileStartPC < filePC {
+			// fileIndex is in effect starting at fileStartPC up to
+			// but not including filePC, and it's the file we want.
+			// Run the PC table looking for a matching line number
+			// or until we reach filePC.
+			lineStartPC := linePC
+			for linePC < filePC && t.step(&fl, &linePC, &lineVal, linePC == entry) {
+				// lineVal is in effect until linePC, and lineStartPC < filePC.
+				if lineVal == line {
+					if fileStartPC <= lineStartPC {
+						return lineStartPC
+					}
+					if fileStartPC < linePC {
+						return fileStartPC
+					}
+				}
+				lineStartPC = linePC
+			}
+		}
+		fileStartPC = filePC
+	}
+	return 0
+}
+
+// go12PCToLine maps program counter to line number for the Go 1.2 pcln table.
+func (t *LineTable) go12PCToLine(pc uint64) (line int) {
+	defer func() {
+		if recover() != nil {
+			line = -1
+		}
+	}()
+
+	f := t.findFunc(pc)
+	if f == nil {
+		return -1
+	}
+	entry := t.uintptr(f)
+	linetab := t.binary.Uint32(f[t.ptrsize+5*4:])
+	return int(t.pcvalue(linetab, entry, pc))
+}
+
+// go12PCToFile maps program counter to file name for the Go 1.2 pcln table.
+func (t *LineTable) go12PCToFile(pc uint64) (file string) {
+	defer func() {
+		if recover() != nil {
+			file = ""
+		}
+	}()
+
+	f := t.findFunc(pc)
+	if f == nil {
+		return ""
+	}
+	entry := t.uintptr(f)
+	filetab := t.binary.Uint32(f[t.ptrsize+4*4:])
+	fno := t.pcvalue(filetab, entry, pc)
+	if t.version == ver12 {
+		if fno <= 0 {
+			return ""
+		}
+		return t.string(t.binary.Uint32(t.filetab[4*fno:]))
+	}
+	// Go ≥ 1.16
+	if fno < 0 { // 0 is valid for ≥ 1.16
+		return ""
+	}
+	cuoff := t.binary.Uint32(f[t.ptrsize+7*4:])
+	if fnoff := t.binary.Uint32(t.cutab[(cuoff+uint32(fno))*4:]); fnoff != ^uint32(0) {
+		return t.stringFrom(t.filetab, fnoff)
+	}
+	return ""
+}
+
+// go12LineToPC maps a (file, line) pair to a program counter for the Go 1.2/1.16 pcln table.
+func (t *LineTable) go12LineToPC(file string, line int) (pc uint64) {
+	defer func() {
+		if recover() != nil {
+			pc = 0
+		}
+	}()
+
+	t.initFileMap()
+	filenum, ok := t.fileMap[file]
+	if !ok {
+		return 0
+	}
+
+	// Scan all functions.
+	// If this turns out to be a bottleneck, we could build a map[int32][]int32
+	// mapping file number to a list of functions with code from that file.
+	var cutab []byte
+	for i := uint32(0); i < t.nfunctab; i++ {
+		f := t.funcdata[t.uintptr(t.functab[2*t.ptrsize*i+t.ptrsize:]):]
+		entry := t.uintptr(f)
+		filetab := t.binary.Uint32(f[t.ptrsize+4*4:])
+		linetab := t.binary.Uint32(f[t.ptrsize+5*4:])
+		if t.version == ver116 {
+			cuoff := t.binary.Uint32(f[t.ptrsize+7*4:]) * 4
+			cutab = t.cutab[cuoff:]
+		}
+		pc := t.findFileLine(entry, filetab, linetab, int32(filenum), int32(line), cutab)
+		if pc != 0 {
+			return pc
+		}
+	}
+	return 0
+}
+
+// initFileMap initializes the map from file name to file number.
+func (t *LineTable) initFileMap() {
+	t.mu.Lock()
+	defer t.mu.Unlock()
+
+	if t.fileMap != nil {
+		return
+	}
+	m := make(map[string]uint32)
+
+	if t.version == ver12 {
+		for i := uint32(1); i < t.nfiletab; i++ {
+			s := t.string(t.binary.Uint32(t.filetab[4*i:]))
+			m[s] = i
+		}
+	} else {
+		var pos uint32
+		for i := uint32(0); i < t.nfiletab; i++ {
+			s := t.stringFrom(t.filetab, pos)
+			m[s] = pos
+			pos += uint32(len(s) + 1)
+		}
+	}
+	t.fileMap = m
+}
+
+// go12MapFiles adds to m a key for every file in the Go 1.2 LineTable.
+// Every key maps to obj. That's not a very interesting map, but it provides
+// a way for callers to obtain the list of files in the program.
+func (t *LineTable) go12MapFiles(m map[string]*Obj, obj *Obj) {
+	defer func() {
+		recover()
+	}()
+
+	t.initFileMap()
+	for file := range t.fileMap {
+		m[file] = obj
+	}
+}
diff --git a/src/debug/gosym/pclntab_test.go b/src/debug/gosym/pclntab_test.go
new file mode 100644
index 0000000..7347139
--- /dev/null
+++ b/src/debug/gosym/pclntab_test.go
@@ -0,0 +1,316 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package gosym
+
+import (
+	"bytes"
+	"compress/gzip"
+	"debug/elf"
+	"internal/testenv"
+	"io"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"runtime"
+	"strings"
+	"testing"
+)
+
+var (
+	pclineTempDir    string
+	pclinetestBinary string
+)
+
+func dotest(t *testing.T) {
+	testenv.MustHaveGoBuild(t)
+	// For now, only works on amd64 platforms.
+	if runtime.GOARCH != "amd64" {
+		t.Skipf("skipping on non-AMD64 system %s", runtime.GOARCH)
+	}
+	var err error
+	pclineTempDir, err = os.MkdirTemp("", "pclinetest")
+	if err != nil {
+		t.Fatal(err)
+	}
+	pclinetestBinary = filepath.Join(pclineTempDir, "pclinetest")
+	cmd := exec.Command(testenv.GoToolPath(t), "build", "-o", pclinetestBinary)
+	cmd.Dir = "testdata"
+	cmd.Env = append(os.Environ(), "GOOS=linux")
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	if err := cmd.Run(); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func endtest() {
+	if pclineTempDir != "" {
+		os.RemoveAll(pclineTempDir)
+		pclineTempDir = ""
+		pclinetestBinary = ""
+	}
+}
+
+// skipIfNotELF skips the test if we are not running on an ELF system.
+// These tests open and examine the test binary, and use elf.Open to do so.
+func skipIfNotELF(t *testing.T) {
+	switch runtime.GOOS {
+	case "dragonfly", "freebsd", "linux", "netbsd", "openbsd", "solaris", "illumos":
+		// OK.
+	default:
+		t.Skipf("skipping on non-ELF system %s", runtime.GOOS)
+	}
+}
+
+func getTable(t *testing.T) *Table {
+	f, tab := crack(os.Args[0], t)
+	f.Close()
+	return tab
+}
+
+func crack(file string, t *testing.T) (*elf.File, *Table) {
+	// Open self
+	f, err := elf.Open(file)
+	if err != nil {
+		t.Fatal(err)
+	}
+	return parse(file, f, t)
+}
+
+func parse(file string, f *elf.File, t *testing.T) (*elf.File, *Table) {
+	s := f.Section(".gosymtab")
+	if s == nil {
+		t.Skip("no .gosymtab section")
+	}
+	symdat, err := s.Data()
+	if err != nil {
+		f.Close()
+		t.Fatalf("reading %s gosymtab: %v", file, err)
+	}
+	pclndat, err := f.Section(".gopclntab").Data()
+	if err != nil {
+		f.Close()
+		t.Fatalf("reading %s gopclntab: %v", file, err)
+	}
+
+	pcln := NewLineTable(pclndat, f.Section(".text").Addr)
+	tab, err := NewTable(symdat, pcln)
+	if err != nil {
+		f.Close()
+		t.Fatalf("parsing %s gosymtab: %v", file, err)
+	}
+
+	return f, tab
+}
+
+func TestLineFromAline(t *testing.T) {
+	skipIfNotELF(t)
+
+	tab := getTable(t)
+	if tab.go12line != nil {
+		// aline's don't exist in the Go 1.2 table.
+		t.Skip("not relevant to Go 1.2 symbol table")
+	}
+
+	// Find the sym package
+	pkg := tab.LookupFunc("debug/gosym.TestLineFromAline").Obj
+	if pkg == nil {
+		t.Fatalf("nil pkg")
+	}
+
+	// Walk every absolute line and ensure that we hit every
+	// source line monotonically
+	lastline := make(map[string]int)
+	final := -1
+	for i := 0; i < 10000; i++ {
+		path, line := pkg.lineFromAline(i)
+		// Check for end of object
+		if path == "" {
+			if final == -1 {
+				final = i - 1
+			}
+			continue
+		} else if final != -1 {
+			t.Fatalf("reached end of package at absolute line %d, but absolute line %d mapped to %s:%d", final, i, path, line)
+		}
+		// It's okay to see files multiple times (e.g., sys.a)
+		if line == 1 {
+			lastline[path] = 1
+			continue
+		}
+		// Check that the is the next line in path
+		ll, ok := lastline[path]
+		if !ok {
+			t.Errorf("file %s starts on line %d", path, line)
+		} else if line != ll+1 {
+			t.Fatalf("expected next line of file %s to be %d, got %d", path, ll+1, line)
+		}
+		lastline[path] = line
+	}
+	if final == -1 {
+		t.Errorf("never reached end of object")
+	}
+}
+
+func TestLineAline(t *testing.T) {
+	skipIfNotELF(t)
+
+	tab := getTable(t)
+	if tab.go12line != nil {
+		// aline's don't exist in the Go 1.2 table.
+		t.Skip("not relevant to Go 1.2 symbol table")
+	}
+
+	for _, o := range tab.Files {
+		// A source file can appear multiple times in a
+		// object.  alineFromLine will always return alines in
+		// the first file, so track which lines we've seen.
+		found := make(map[string]int)
+		for i := 0; i < 1000; i++ {
+			path, line := o.lineFromAline(i)
+			if path == "" {
+				break
+			}
+
+			// cgo files are full of 'Z' symbols, which we don't handle
+			if len(path) > 4 && path[len(path)-4:] == ".cgo" {
+				continue
+			}
+
+			if minline, ok := found[path]; path != "" && ok {
+				if minline >= line {
+					// We've already covered this file
+					continue
+				}
+			}
+			found[path] = line
+
+			a, err := o.alineFromLine(path, line)
+			if err != nil {
+				t.Errorf("absolute line %d in object %s maps to %s:%d, but mapping that back gives error %s", i, o.Paths[0].Name, path, line, err)
+			} else if a != i {
+				t.Errorf("absolute line %d in object %s maps to %s:%d, which maps back to absolute line %d\n", i, o.Paths[0].Name, path, line, a)
+			}
+		}
+	}
+}
+
+func TestPCLine(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skipping in -short mode")
+	}
+	dotest(t)
+	defer endtest()
+
+	f, tab := crack(pclinetestBinary, t)
+	defer f.Close()
+	text := f.Section(".text")
+	textdat, err := text.Data()
+	if err != nil {
+		t.Fatalf("reading .text: %v", err)
+	}
+
+	// Test PCToLine
+	sym := tab.LookupFunc("main.linefrompc")
+	wantLine := 0
+	for pc := sym.Entry; pc < sym.End; pc++ {
+		off := pc - text.Addr // TODO(rsc): should not need off; bug in 8g
+		if textdat[off] == 255 {
+			break
+		}
+		wantLine += int(textdat[off])
+		t.Logf("off is %d %#x (max %d)", off, textdat[off], sym.End-pc)
+		file, line, fn := tab.PCToLine(pc)
+		if fn == nil {
+			t.Errorf("failed to get line of PC %#x", pc)
+		} else if !strings.HasSuffix(file, "pclinetest.s") || line != wantLine || fn != sym {
+			t.Errorf("PCToLine(%#x) = %s:%d (%s), want %s:%d (%s)", pc, file, line, fn.Name, "pclinetest.s", wantLine, sym.Name)
+		}
+	}
+
+	// Test LineToPC
+	sym = tab.LookupFunc("main.pcfromline")
+	lookupline := -1
+	wantLine = 0
+	off := uint64(0) // TODO(rsc): should not need off; bug in 8g
+	for pc := sym.Value; pc < sym.End; pc += 2 + uint64(textdat[off]) {
+		file, line, fn := tab.PCToLine(pc)
+		off = pc - text.Addr
+		if textdat[off] == 255 {
+			break
+		}
+		wantLine += int(textdat[off])
+		if line != wantLine {
+			t.Errorf("expected line %d at PC %#x in pcfromline, got %d", wantLine, pc, line)
+			off = pc + 1 - text.Addr
+			continue
+		}
+		if lookupline == -1 {
+			lookupline = line
+		}
+		for ; lookupline <= line; lookupline++ {
+			pc2, fn2, err := tab.LineToPC(file, lookupline)
+			if lookupline != line {
+				// Should be nothing on this line
+				if err == nil {
+					t.Errorf("expected no PC at line %d, got %#x (%s)", lookupline, pc2, fn2.Name)
+				}
+			} else if err != nil {
+				t.Errorf("failed to get PC of line %d: %s", lookupline, err)
+			} else if pc != pc2 {
+				t.Errorf("expected PC %#x (%s) at line %d, got PC %#x (%s)", pc, fn.Name, line, pc2, fn2.Name)
+			}
+		}
+		off = pc + 1 - text.Addr
+	}
+}
+
+// Test that we can parse a pclntab from 1.15.
+// The file was compiled in /tmp/hello.go:
+// [BEGIN]
+// package main
+//
+// func main() {
+//    println("hello")
+// }
+// [END]
+func Test115PclnParsing(t *testing.T) {
+	zippedDat, err := os.ReadFile("testdata/pcln115.gz")
+	if err != nil {
+		t.Fatal(err)
+	}
+	var gzReader *gzip.Reader
+	gzReader, err = gzip.NewReader(bytes.NewBuffer(zippedDat))
+	if err != nil {
+		t.Fatal(err)
+	}
+	var dat []byte
+	dat, err = io.ReadAll(gzReader)
+	if err != nil {
+		t.Fatal(err)
+	}
+	const textStart = 0x1001000
+	pcln := NewLineTable(dat, textStart)
+	var tab *Table
+	tab, err = NewTable(nil, pcln)
+	if err != nil {
+		t.Fatal(err)
+	}
+	var f *Func
+	var pc uint64
+	pc, f, err = tab.LineToPC("/tmp/hello.go", 3)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if pcln.version != ver12 {
+		t.Fatal("Expected pcln to parse as an older version")
+	}
+	if pc != 0x105c280 {
+		t.Fatalf("expect pc = 0x105c280, got 0x%x", pc)
+	}
+	if f.Name != "main.main" {
+		t.Fatalf("expected to parse name as main.main, got %v", f.Name)
+	}
+}
diff --git a/src/debug/gosym/symtab.go b/src/debug/gosym/symtab.go
new file mode 100644
index 0000000..00701c2
--- /dev/null
+++ b/src/debug/gosym/symtab.go
@@ -0,0 +1,723 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package gosym implements access to the Go symbol
+// and line number tables embedded in Go binaries generated
+// by the gc compilers.
+package gosym
+
+import (
+	"bytes"
+	"encoding/binary"
+	"fmt"
+	"strconv"
+	"strings"
+)
+
+/*
+ * Symbols
+ */
+
+// A Sym represents a single symbol table entry.
+type Sym struct {
+	Value  uint64
+	Type   byte
+	Name   string
+	GoType uint64
+	// If this symbol is a function symbol, the corresponding Func
+	Func *Func
+}
+
+// Static reports whether this symbol is static (not visible outside its file).
+func (s *Sym) Static() bool { return s.Type >= 'a' }
+
+// PackageName returns the package part of the symbol name,
+// or the empty string if there is none.
+func (s *Sym) PackageName() string {
+	name := s.Name
+
+	// A prefix of "type." and "go." is a compiler-generated symbol that doesn't belong to any package.
+	// See variable reservedimports in cmd/compile/internal/gc/subr.go
+	if strings.HasPrefix(name, "go.") || strings.HasPrefix(name, "type.") {
+		return ""
+	}
+
+	pathend := strings.LastIndex(name, "/")
+	if pathend < 0 {
+		pathend = 0
+	}
+
+	if i := strings.Index(name[pathend:], "."); i != -1 {
+		return name[:pathend+i]
+	}
+	return ""
+}
+
+// ReceiverName returns the receiver type name of this symbol,
+// or the empty string if there is none.
+func (s *Sym) ReceiverName() string {
+	pathend := strings.LastIndex(s.Name, "/")
+	if pathend < 0 {
+		pathend = 0
+	}
+	l := strings.Index(s.Name[pathend:], ".")
+	r := strings.LastIndex(s.Name[pathend:], ".")
+	if l == -1 || r == -1 || l == r {
+		return ""
+	}
+	return s.Name[pathend+l+1 : pathend+r]
+}
+
+// BaseName returns the symbol name without the package or receiver name.
+func (s *Sym) BaseName() string {
+	if i := strings.LastIndex(s.Name, "."); i != -1 {
+		return s.Name[i+1:]
+	}
+	return s.Name
+}
+
+// A Func collects information about a single function.
+type Func struct {
+	Entry uint64
+	*Sym
+	End       uint64
+	Params    []*Sym // nil for Go 1.3 and later binaries
+	Locals    []*Sym // nil for Go 1.3 and later binaries
+	FrameSize int
+	LineTable *LineTable
+	Obj       *Obj
+}
+
+// An Obj represents a collection of functions in a symbol table.
+//
+// The exact method of division of a binary into separate Objs is an internal detail
+// of the symbol table format.
+//
+// In early versions of Go each source file became a different Obj.
+//
+// In Go 1 and Go 1.1, each package produced one Obj for all Go sources
+// and one Obj per C source file.
+//
+// In Go 1.2, there is a single Obj for the entire program.
+type Obj struct {
+	// Funcs is a list of functions in the Obj.
+	Funcs []Func
+
+	// In Go 1.1 and earlier, Paths is a list of symbols corresponding
+	// to the source file names that produced the Obj.
+	// In Go 1.2, Paths is nil.
+	// Use the keys of Table.Files to obtain a list of source files.
+	Paths []Sym // meta
+}
+
+/*
+ * Symbol tables
+ */
+
+// Table represents a Go symbol table. It stores all of the
+// symbols decoded from the program and provides methods to translate
+// between symbols, names, and addresses.
+type Table struct {
+	Syms  []Sym // nil for Go 1.3 and later binaries
+	Funcs []Func
+	Files map[string]*Obj // for Go 1.2 and later all files map to one Obj
+	Objs  []Obj           // for Go 1.2 and later only one Obj in slice
+
+	go12line *LineTable // Go 1.2 line number table
+}
+
+type sym struct {
+	value  uint64
+	gotype uint64
+	typ    byte
+	name   []byte
+}
+
+var (
+	littleEndianSymtab    = []byte{0xFD, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00}
+	bigEndianSymtab       = []byte{0xFF, 0xFF, 0xFF, 0xFD, 0x00, 0x00, 0x00}
+	oldLittleEndianSymtab = []byte{0xFE, 0xFF, 0xFF, 0xFF, 0x00, 0x00}
+)
+
+func walksymtab(data []byte, fn func(sym) error) error {
+	if len(data) == 0 { // missing symtab is okay
+		return nil
+	}
+	var order binary.ByteOrder = binary.BigEndian
+	newTable := false
+	switch {
+	case bytes.HasPrefix(data, oldLittleEndianSymtab):
+		// Same as Go 1.0, but little endian.
+		// Format was used during interim development between Go 1.0 and Go 1.1.
+		// Should not be widespread, but easy to support.
+		data = data[6:]
+		order = binary.LittleEndian
+	case bytes.HasPrefix(data, bigEndianSymtab):
+		newTable = true
+	case bytes.HasPrefix(data, littleEndianSymtab):
+		newTable = true
+		order = binary.LittleEndian
+	}
+	var ptrsz int
+	if newTable {
+		if len(data) < 8 {
+			return &DecodingError{len(data), "unexpected EOF", nil}
+		}
+		ptrsz = int(data[7])
+		if ptrsz != 4 && ptrsz != 8 {
+			return &DecodingError{7, "invalid pointer size", ptrsz}
+		}
+		data = data[8:]
+	}
+	var s sym
+	p := data
+	for len(p) >= 4 {
+		var typ byte
+		if newTable {
+			// Symbol type, value, Go type.
+			typ = p[0] & 0x3F
+			wideValue := p[0]&0x40 != 0
+			goType := p[0]&0x80 != 0
+			if typ < 26 {
+				typ += 'A'
+			} else {
+				typ += 'a' - 26
+			}
+			s.typ = typ
+			p = p[1:]
+			if wideValue {
+				if len(p) < ptrsz {
+					return &DecodingError{len(data), "unexpected EOF", nil}
+				}
+				// fixed-width value
+				if ptrsz == 8 {
+					s.value = order.Uint64(p[0:8])
+					p = p[8:]
+				} else {
+					s.value = uint64(order.Uint32(p[0:4]))
+					p = p[4:]
+				}
+			} else {
+				// varint value
+				s.value = 0
+				shift := uint(0)
+				for len(p) > 0 && p[0]&0x80 != 0 {
+					s.value |= uint64(p[0]&0x7F) << shift
+					shift += 7
+					p = p[1:]
+				}
+				if len(p) == 0 {
+					return &DecodingError{len(data), "unexpected EOF", nil}
+				}
+				s.value |= uint64(p[0]) << shift
+				p = p[1:]
+			}
+			if goType {
+				if len(p) < ptrsz {
+					return &DecodingError{len(data), "unexpected EOF", nil}
+				}
+				// fixed-width go type
+				if ptrsz == 8 {
+					s.gotype = order.Uint64(p[0:8])
+					p = p[8:]
+				} else {
+					s.gotype = uint64(order.Uint32(p[0:4]))
+					p = p[4:]
+				}
+			}
+		} else {
+			// Value, symbol type.
+			s.value = uint64(order.Uint32(p[0:4]))
+			if len(p) < 5 {
+				return &DecodingError{len(data), "unexpected EOF", nil}
+			}
+			typ = p[4]
+			if typ&0x80 == 0 {
+				return &DecodingError{len(data) - len(p) + 4, "bad symbol type", typ}
+			}
+			typ &^= 0x80
+			s.typ = typ
+			p = p[5:]
+		}
+
+		// Name.
+		var i int
+		var nnul int
+		for i = 0; i < len(p); i++ {
+			if p[i] == 0 {
+				nnul = 1
+				break
+			}
+		}
+		switch typ {
+		case 'z', 'Z':
+			p = p[i+nnul:]
+			for i = 0; i+2 <= len(p); i += 2 {
+				if p[i] == 0 && p[i+1] == 0 {
+					nnul = 2
+					break
+				}
+			}
+		}
+		if len(p) < i+nnul {
+			return &DecodingError{len(data), "unexpected EOF", nil}
+		}
+		s.name = p[0:i]
+		i += nnul
+		p = p[i:]
+
+		if !newTable {
+			if len(p) < 4 {
+				return &DecodingError{len(data), "unexpected EOF", nil}
+			}
+			// Go type.
+			s.gotype = uint64(order.Uint32(p[:4]))
+			p = p[4:]
+		}
+		fn(s)
+	}
+	return nil
+}
+
+// NewTable decodes the Go symbol table (the ".gosymtab" section in ELF),
+// returning an in-memory representation.
+// Starting with Go 1.3, the Go symbol table no longer includes symbol data.
+func NewTable(symtab []byte, pcln *LineTable) (*Table, error) {
+	var n int
+	err := walksymtab(symtab, func(s sym) error {
+		n++
+		return nil
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	var t Table
+	if pcln.isGo12() {
+		t.go12line = pcln
+	}
+	fname := make(map[uint16]string)
+	t.Syms = make([]Sym, 0, n)
+	nf := 0
+	nz := 0
+	lasttyp := uint8(0)
+	err = walksymtab(symtab, func(s sym) error {
+		n := len(t.Syms)
+		t.Syms = t.Syms[0 : n+1]
+		ts := &t.Syms[n]
+		ts.Type = s.typ
+		ts.Value = s.value
+		ts.GoType = s.gotype
+		switch s.typ {
+		default:
+			// rewrite name to use . instead of · (c2 b7)
+			w := 0
+			b := s.name
+			for i := 0; i < len(b); i++ {
+				if b[i] == 0xc2 && i+1 < len(b) && b[i+1] == 0xb7 {
+					i++
+					b[i] = '.'
+				}
+				b[w] = b[i]
+				w++
+			}
+			ts.Name = string(s.name[0:w])
+		case 'z', 'Z':
+			if lasttyp != 'z' && lasttyp != 'Z' {
+				nz++
+			}
+			for i := 0; i < len(s.name); i += 2 {
+				eltIdx := binary.BigEndian.Uint16(s.name[i : i+2])
+				elt, ok := fname[eltIdx]
+				if !ok {
+					return &DecodingError{-1, "bad filename code", eltIdx}
+				}
+				if n := len(ts.Name); n > 0 && ts.Name[n-1] != '/' {
+					ts.Name += "/"
+				}
+				ts.Name += elt
+			}
+		}
+		switch s.typ {
+		case 'T', 't', 'L', 'l':
+			nf++
+		case 'f':
+			fname[uint16(s.value)] = ts.Name
+		}
+		lasttyp = s.typ
+		return nil
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	t.Funcs = make([]Func, 0, nf)
+	t.Files = make(map[string]*Obj)
+
+	var obj *Obj
+	if t.go12line != nil {
+		// Put all functions into one Obj.
+		t.Objs = make([]Obj, 1)
+		obj = &t.Objs[0]
+		t.go12line.go12MapFiles(t.Files, obj)
+	} else {
+		t.Objs = make([]Obj, 0, nz)
+	}
+
+	// Count text symbols and attach frame sizes, parameters, and
+	// locals to them. Also, find object file boundaries.
+	lastf := 0
+	for i := 0; i < len(t.Syms); i++ {
+		sym := &t.Syms[i]
+		switch sym.Type {
+		case 'Z', 'z': // path symbol
+			if t.go12line != nil {
+				// Go 1.2 binaries have the file information elsewhere. Ignore.
+				break
+			}
+			// Finish the current object
+			if obj != nil {
+				obj.Funcs = t.Funcs[lastf:]
+			}
+			lastf = len(t.Funcs)
+
+			// Start new object
+			n := len(t.Objs)
+			t.Objs = t.Objs[0 : n+1]
+			obj = &t.Objs[n]
+
+			// Count & copy path symbols
+			var end int
+			for end = i + 1; end < len(t.Syms); end++ {
+				if c := t.Syms[end].Type; c != 'Z' && c != 'z' {
+					break
+				}
+			}
+			obj.Paths = t.Syms[i:end]
+			i = end - 1 // loop will i++
+
+			// Record file names
+			depth := 0
+			for j := range obj.Paths {
+				s := &obj.Paths[j]
+				if s.Name == "" {
+					depth--
+				} else {
+					if depth == 0 {
+						t.Files[s.Name] = obj
+					}
+					depth++
+				}
+			}
+
+		case 'T', 't', 'L', 'l': // text symbol
+			if n := len(t.Funcs); n > 0 {
+				t.Funcs[n-1].End = sym.Value
+			}
+			if sym.Name == "runtime.etext" || sym.Name == "etext" {
+				continue
+			}
+
+			// Count parameter and local (auto) syms
+			var np, na int
+			var end int
+		countloop:
+			for end = i + 1; end < len(t.Syms); end++ {
+				switch t.Syms[end].Type {
+				case 'T', 't', 'L', 'l', 'Z', 'z':
+					break countloop
+				case 'p':
+					np++
+				case 'a':
+					na++
+				}
+			}
+
+			// Fill in the function symbol
+			n := len(t.Funcs)
+			t.Funcs = t.Funcs[0 : n+1]
+			fn := &t.Funcs[n]
+			sym.Func = fn
+			fn.Params = make([]*Sym, 0, np)
+			fn.Locals = make([]*Sym, 0, na)
+			fn.Sym = sym
+			fn.Entry = sym.Value
+			fn.Obj = obj
+			if t.go12line != nil {
+				// All functions share the same line table.
+				// It knows how to narrow down to a specific
+				// function quickly.
+				fn.LineTable = t.go12line
+			} else if pcln != nil {
+				fn.LineTable = pcln.slice(fn.Entry)
+				pcln = fn.LineTable
+			}
+			for j := i; j < end; j++ {
+				s := &t.Syms[j]
+				switch s.Type {
+				case 'm':
+					fn.FrameSize = int(s.Value)
+				case 'p':
+					n := len(fn.Params)
+					fn.Params = fn.Params[0 : n+1]
+					fn.Params[n] = s
+				case 'a':
+					n := len(fn.Locals)
+					fn.Locals = fn.Locals[0 : n+1]
+					fn.Locals[n] = s
+				}
+			}
+			i = end - 1 // loop will i++
+		}
+	}
+
+	if t.go12line != nil && nf == 0 {
+		t.Funcs = t.go12line.go12Funcs()
+	}
+	if obj != nil {
+		obj.Funcs = t.Funcs[lastf:]
+	}
+	return &t, nil
+}
+
+// PCToFunc returns the function containing the program counter pc,
+// or nil if there is no such function.
+func (t *Table) PCToFunc(pc uint64) *Func {
+	funcs := t.Funcs
+	for len(funcs) > 0 {
+		m := len(funcs) / 2
+		fn := &funcs[m]
+		switch {
+		case pc < fn.Entry:
+			funcs = funcs[0:m]
+		case fn.Entry <= pc && pc < fn.End:
+			return fn
+		default:
+			funcs = funcs[m+1:]
+		}
+	}
+	return nil
+}
+
+// PCToLine looks up line number information for a program counter.
+// If there is no information, it returns fn == nil.
+func (t *Table) PCToLine(pc uint64) (file string, line int, fn *Func) {
+	if fn = t.PCToFunc(pc); fn == nil {
+		return
+	}
+	if t.go12line != nil {
+		file = t.go12line.go12PCToFile(pc)
+		line = t.go12line.go12PCToLine(pc)
+	} else {
+		file, line = fn.Obj.lineFromAline(fn.LineTable.PCToLine(pc))
+	}
+	return
+}
+
+// LineToPC looks up the first program counter on the given line in
+// the named file. It returns UnknownPathError or UnknownLineError if
+// there is an error looking up this line.
+func (t *Table) LineToPC(file string, line int) (pc uint64, fn *Func, err error) {
+	obj, ok := t.Files[file]
+	if !ok {
+		return 0, nil, UnknownFileError(file)
+	}
+
+	if t.go12line != nil {
+		pc := t.go12line.go12LineToPC(file, line)
+		if pc == 0 {
+			return 0, nil, &UnknownLineError{file, line}
+		}
+		return pc, t.PCToFunc(pc), nil
+	}
+
+	abs, err := obj.alineFromLine(file, line)
+	if err != nil {
+		return
+	}
+	for i := range obj.Funcs {
+		f := &obj.Funcs[i]
+		pc := f.LineTable.LineToPC(abs, f.End)
+		if pc != 0 {
+			return pc, f, nil
+		}
+	}
+	return 0, nil, &UnknownLineError{file, line}
+}
+
+// LookupSym returns the text, data, or bss symbol with the given name,
+// or nil if no such symbol is found.
+func (t *Table) LookupSym(name string) *Sym {
+	// TODO(austin) Maybe make a map
+	for i := range t.Syms {
+		s := &t.Syms[i]
+		switch s.Type {
+		case 'T', 't', 'L', 'l', 'D', 'd', 'B', 'b':
+			if s.Name == name {
+				return s
+			}
+		}
+	}
+	return nil
+}
+
+// LookupFunc returns the text, data, or bss symbol with the given name,
+// or nil if no such symbol is found.
+func (t *Table) LookupFunc(name string) *Func {
+	for i := range t.Funcs {
+		f := &t.Funcs[i]
+		if f.Sym.Name == name {
+			return f
+		}
+	}
+	return nil
+}
+
+// SymByAddr returns the text, data, or bss symbol starting at the given address.
+func (t *Table) SymByAddr(addr uint64) *Sym {
+	for i := range t.Syms {
+		s := &t.Syms[i]
+		switch s.Type {
+		case 'T', 't', 'L', 'l', 'D', 'd', 'B', 'b':
+			if s.Value == addr {
+				return s
+			}
+		}
+	}
+	return nil
+}
+
+/*
+ * Object files
+ */
+
+// This is legacy code for Go 1.1 and earlier, which used the
+// Plan 9 format for pc-line tables. This code was never quite
+// correct. It's probably very close, and it's usually correct, but
+// we never quite found all the corner cases.
+//
+// Go 1.2 and later use a simpler format, documented at golang.org/s/go12symtab.
+
+func (o *Obj) lineFromAline(aline int) (string, int) {
+	type stackEnt struct {
+		path   string
+		start  int
+		offset int
+		prev   *stackEnt
+	}
+
+	noPath := &stackEnt{"", 0, 0, nil}
+	tos := noPath
+
+pathloop:
+	for _, s := range o.Paths {
+		val := int(s.Value)
+		switch {
+		case val > aline:
+			break pathloop
+
+		case val == 1:
+			// Start a new stack
+			tos = &stackEnt{s.Name, val, 0, noPath}
+
+		case s.Name == "":
+			// Pop
+			if tos == noPath {
+				return "<malformed symbol table>", 0
+			}
+			tos.prev.offset += val - tos.start
+			tos = tos.prev
+
+		default:
+			// Push
+			tos = &stackEnt{s.Name, val, 0, tos}
+		}
+	}
+
+	if tos == noPath {
+		return "", 0
+	}
+	return tos.path, aline - tos.start - tos.offset + 1
+}
+
+func (o *Obj) alineFromLine(path string, line int) (int, error) {
+	if line < 1 {
+		return 0, &UnknownLineError{path, line}
+	}
+
+	for i, s := range o.Paths {
+		// Find this path
+		if s.Name != path {
+			continue
+		}
+
+		// Find this line at this stack level
+		depth := 0
+		var incstart int
+		line += int(s.Value)
+	pathloop:
+		for _, s := range o.Paths[i:] {
+			val := int(s.Value)
+			switch {
+			case depth == 1 && val >= line:
+				return line - 1, nil
+
+			case s.Name == "":
+				depth--
+				if depth == 0 {
+					break pathloop
+				} else if depth == 1 {
+					line += val - incstart
+				}
+
+			default:
+				if depth == 1 {
+					incstart = val
+				}
+				depth++
+			}
+		}
+		return 0, &UnknownLineError{path, line}
+	}
+	return 0, UnknownFileError(path)
+}
+
+/*
+ * Errors
+ */
+
+// UnknownFileError represents a failure to find the specific file in
+// the symbol table.
+type UnknownFileError string
+
+func (e UnknownFileError) Error() string { return "unknown file: " + string(e) }
+
+// UnknownLineError represents a failure to map a line to a program
+// counter, either because the line is beyond the bounds of the file
+// or because there is no code on the given line.
+type UnknownLineError struct {
+	File string
+	Line int
+}
+
+func (e *UnknownLineError) Error() string {
+	return "no code at " + e.File + ":" + strconv.Itoa(e.Line)
+}
+
+// DecodingError represents an error during the decoding of
+// the symbol table.
+type DecodingError struct {
+	off int
+	msg string
+	val interface{}
+}
+
+func (e *DecodingError) Error() string {
+	msg := e.msg
+	if e.val != nil {
+		msg += fmt.Sprintf(" '%v'", e.val)
+	}
+	msg += fmt.Sprintf(" at byte %#x", e.off)
+	return msg
+}
diff --git a/src/debug/gosym/symtab_test.go b/src/debug/gosym/symtab_test.go
new file mode 100644
index 0000000..b6ed8f5
--- /dev/null
+++ b/src/debug/gosym/symtab_test.go
@@ -0,0 +1,58 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package gosym
+
+import (
+	"fmt"
+	"testing"
+)
+
+func assertString(t *testing.T, dsc, out, tgt string) {
+	if out != tgt {
+		t.Fatalf("Expected: %q Actual: %q for %s", tgt, out, dsc)
+	}
+}
+
+func TestStandardLibPackage(t *testing.T) {
+	s1 := Sym{Name: "io.(*LimitedReader).Read"}
+	s2 := Sym{Name: "io.NewSectionReader"}
+	assertString(t, fmt.Sprintf("package of %q", s1.Name), s1.PackageName(), "io")
+	assertString(t, fmt.Sprintf("package of %q", s2.Name), s2.PackageName(), "io")
+	assertString(t, fmt.Sprintf("receiver of %q", s1.Name), s1.ReceiverName(), "(*LimitedReader)")
+	assertString(t, fmt.Sprintf("receiver of %q", s2.Name), s2.ReceiverName(), "")
+}
+
+func TestStandardLibPathPackage(t *testing.T) {
+	s1 := Sym{Name: "debug/gosym.(*LineTable).PCToLine"}
+	s2 := Sym{Name: "debug/gosym.NewTable"}
+	assertString(t, fmt.Sprintf("package of %q", s1.Name), s1.PackageName(), "debug/gosym")
+	assertString(t, fmt.Sprintf("package of %q", s2.Name), s2.PackageName(), "debug/gosym")
+	assertString(t, fmt.Sprintf("receiver of %q", s1.Name), s1.ReceiverName(), "(*LineTable)")
+	assertString(t, fmt.Sprintf("receiver of %q", s2.Name), s2.ReceiverName(), "")
+}
+
+func TestRemotePackage(t *testing.T) {
+	s1 := Sym{Name: "github.com/docker/doc.ker/pkg/mflag.(*FlagSet).PrintDefaults"}
+	s2 := Sym{Name: "github.com/docker/doc.ker/pkg/mflag.PrintDefaults"}
+	assertString(t, fmt.Sprintf("package of %q", s1.Name), s1.PackageName(), "github.com/docker/doc.ker/pkg/mflag")
+	assertString(t, fmt.Sprintf("package of %q", s2.Name), s2.PackageName(), "github.com/docker/doc.ker/pkg/mflag")
+	assertString(t, fmt.Sprintf("receiver of %q", s1.Name), s1.ReceiverName(), "(*FlagSet)")
+	assertString(t, fmt.Sprintf("receiver of %q", s2.Name), s2.ReceiverName(), "")
+}
+
+func TestIssue29551(t *testing.T) {
+	symNames := []string{
+		"type..eq.[9]debug/elf.intName",
+		"type..hash.debug/elf.ProgHeader",
+		"type..eq.runtime._panic",
+		"type..hash.struct { runtime.gList; runtime.n int32 }",
+		"go.(*struct { sync.Mutex; math/big.table [64]math/big",
+	}
+
+	for _, symName := range symNames {
+		s := Sym{Name: symName}
+		assertString(t, fmt.Sprintf("package of %q", s.Name), s.PackageName(), "")
+	}
+}
diff --git a/src/debug/gosym/testdata/main.go b/src/debug/gosym/testdata/main.go
new file mode 100644
index 0000000..b770218
--- /dev/null
+++ b/src/debug/gosym/testdata/main.go
@@ -0,0 +1,10 @@
+package main
+
+func linefrompc()
+func pcfromline()
+
+func main() {
+	// Prevent GC of our test symbols
+	linefrompc()
+	pcfromline()
+}
diff --git a/src/debug/gosym/testdata/pclinetest.h b/src/debug/gosym/testdata/pclinetest.h
new file mode 100644
index 0000000..156c0b8
--- /dev/null
+++ b/src/debug/gosym/testdata/pclinetest.h
@@ -0,0 +1,9 @@
+// +build ignore
+
+// Empty include file to generate z symbols
+
+
+
+
+
+// EOF
diff --git a/src/debug/gosym/testdata/pclinetest.s b/src/debug/gosym/testdata/pclinetest.s
new file mode 100644
index 0000000..53461cd
--- /dev/null
+++ b/src/debug/gosym/testdata/pclinetest.s
@@ -0,0 +1,48 @@
+TEXT ·linefrompc(SB),4,$0	// Each byte stores its line delta
+BYTE $2;
+BYTE $1;
+BYTE $1; BYTE $0;
+BYTE $1; BYTE $0; BYTE $0;
+BYTE $1; BYTE $0; BYTE $0; BYTE $0; BYTE $0;
+BYTE $1; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0;
+BYTE $1; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0;
+BYTE $1; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0;
+BYTE $1; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0;
+BYTE $1; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0;
+BYTE $1; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0;
+BYTE $1; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0;
+BYTE $1; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0;
+BYTE $1; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0;
+BYTE $1;
+BYTE $1;
+BYTE $1; BYTE $0;
+BYTE $1; BYTE $0; BYTE $0;
+BYTE $1; BYTE $0; BYTE $0; BYTE $0; BYTE $0;
+BYTE $1; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0;
+BYTE $1; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0;
+BYTE $1; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0;
+BYTE $1; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0;
+#include "pclinetest.h"
+BYTE $2;
+#include "pclinetest.h"
+BYTE $2;
+BYTE $255;
+
+TEXT ·pcfromline(SB),4,$0	// Each record stores its line delta, then n, then n more bytes
+BYTE $32; BYTE $0;
+BYTE $1; BYTE $1; BYTE $0;
+BYTE $1; BYTE $0;
+
+BYTE $2; BYTE $4; BYTE $0; BYTE $0; BYTE $0; BYTE $0;
+
+
+#include "pclinetest.h"
+BYTE $4; BYTE $0;
+
+
+BYTE $3; BYTE $3; BYTE $0; BYTE $0; BYTE $0;
+#include "pclinetest.h"
+
+
+BYTE $4; BYTE $3; BYTE $0; BYTE $0; BYTE $0;
+BYTE $255;
diff --git a/src/debug/gosym/testdata/pcln115.gz b/src/debug/gosym/testdata/pcln115.gz
new file mode 100644
index 0000000..db5c3d4
--- /dev/null
+++ b/src/debug/gosym/testdata/pcln115.gz
diff --git a/src/debug/macho/fat.go b/src/debug/macho/fat.go
new file mode 100644
index 0000000..6bd730d
--- /dev/null
+++ b/src/debug/macho/fat.go
@@ -0,0 +1,146 @@
+// Copyright 2014 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package macho
+
+import (
+	"encoding/binary"
+	"fmt"
+	"io"
+	"os"
+)
+
+// A FatFile is a Mach-O universal binary that contains at least one architecture.
+type FatFile struct {
+	Magic  uint32
+	Arches []FatArch
+	closer io.Closer
+}
+
+// A FatArchHeader represents a fat header for a specific image architecture.
+type FatArchHeader struct {
+	Cpu    Cpu
+	SubCpu uint32
+	Offset uint32
+	Size   uint32
+	Align  uint32
+}
+
+const fatArchHeaderSize = 5 * 4
+
+// A FatArch is a Mach-O File inside a FatFile.
+type FatArch struct {
+	FatArchHeader
+	*File
+}
+
+// ErrNotFat is returned from NewFatFile or OpenFat when the file is not a
+// universal binary but may be a thin binary, based on its magic number.
+var ErrNotFat = &FormatError{0, "not a fat Mach-O file", nil}
+
+// NewFatFile creates a new FatFile for accessing all the Mach-O images in a
+// universal binary. The Mach-O binary is expected to start at position 0 in
+// the ReaderAt.
+func NewFatFile(r io.ReaderAt) (*FatFile, error) {
+	var ff FatFile
+	sr := io.NewSectionReader(r, 0, 1<<63-1)
+
+	// Read the fat_header struct, which is always in big endian.
+	// Start with the magic number.
+	err := binary.Read(sr, binary.BigEndian, &ff.Magic)
+	if err != nil {
+		return nil, &FormatError{0, "error reading magic number", nil}
+	} else if ff.Magic != MagicFat {
+		// See if this is a Mach-O file via its magic number. The magic
+		// must be converted to little endian first though.
+		var buf [4]byte
+		binary.BigEndian.PutUint32(buf[:], ff.Magic)
+		leMagic := binary.LittleEndian.Uint32(buf[:])
+		if leMagic == Magic32 || leMagic == Magic64 {
+			return nil, ErrNotFat
+		} else {
+			return nil, &FormatError{0, "invalid magic number", nil}
+		}
+	}
+	offset := int64(4)
+
+	// Read the number of FatArchHeaders that come after the fat_header.
+	var narch uint32
+	err = binary.Read(sr, binary.BigEndian, &narch)
+	if err != nil {
+		return nil, &FormatError{offset, "invalid fat_header", nil}
+	}
+	offset += 4
+
+	if narch < 1 {
+		return nil, &FormatError{offset, "file contains no images", nil}
+	}
+
+	// Combine the Cpu and SubCpu (both uint32) into a uint64 to make sure
+	// there are not duplicate architectures.
+	seenArches := make(map[uint64]bool, narch)
+	// Make sure that all images are for the same MH_ type.
+	var machoType Type
+
+	// Following the fat_header comes narch fat_arch structs that index
+	// Mach-O images further in the file.
+	ff.Arches = make([]FatArch, narch)
+	for i := uint32(0); i < narch; i++ {
+		fa := &ff.Arches[i]
+		err = binary.Read(sr, binary.BigEndian, &fa.FatArchHeader)
+		if err != nil {
+			return nil, &FormatError{offset, "invalid fat_arch header", nil}
+		}
+		offset += fatArchHeaderSize
+
+		fr := io.NewSectionReader(r, int64(fa.Offset), int64(fa.Size))
+		fa.File, err = NewFile(fr)
+		if err != nil {
+			return nil, err
+		}
+
+		// Make sure the architecture for this image is not duplicate.
+		seenArch := (uint64(fa.Cpu) << 32) | uint64(fa.SubCpu)
+		if o, k := seenArches[seenArch]; o || k {
+			return nil, &FormatError{offset, fmt.Sprintf("duplicate architecture cpu=%v, subcpu=%#x", fa.Cpu, fa.SubCpu), nil}
+		}
+		seenArches[seenArch] = true
+
+		// Make sure the Mach-O type matches that of the first image.
+		if i == 0 {
+			machoType = fa.Type
+		} else {
+			if fa.Type != machoType {
+				return nil, &FormatError{offset, fmt.Sprintf("Mach-O type for architecture #%d (type=%#x) does not match first (type=%#x)", i, fa.Type, machoType), nil}
+			}
+		}
+	}
+
+	return &ff, nil
+}
+
+// OpenFat opens the named file using os.Open and prepares it for use as a Mach-O
+// universal binary.
+func OpenFat(name string) (*FatFile, error) {
+	f, err := os.Open(name)
+	if err != nil {
+		return nil, err
+	}
+	ff, err := NewFatFile(f)
+	if err != nil {
+		f.Close()
+		return nil, err
+	}
+	ff.closer = f
+	return ff, nil
+}
+
+func (ff *FatFile) Close() error {
+	var err error
+	if ff.closer != nil {
+		err = ff.closer.Close()
+		ff.closer = nil
+	}
+	return err
+}
diff --git a/src/debug/macho/file.go b/src/debug/macho/file.go
new file mode 100644
index 0000000..cdc500e
--- /dev/null
+++ b/src/debug/macho/file.go
@@ -0,0 +1,710 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package macho implements access to Mach-O object files.
+package macho
+
+// High level access to low level data structures.
+
+import (
+	"bytes"
+	"compress/zlib"
+	"debug/dwarf"
+	"encoding/binary"
+	"fmt"
+	"io"
+	"os"
+	"strings"
+)
+
+// A File represents an open Mach-O file.
+type File struct {
+	FileHeader
+	ByteOrder binary.ByteOrder
+	Loads     []Load
+	Sections  []*Section
+
+	Symtab   *Symtab
+	Dysymtab *Dysymtab
+
+	closer io.Closer
+}
+
+// A Load represents any Mach-O load command.
+type Load interface {
+	Raw() []byte
+}
+
+// A LoadBytes is the uninterpreted bytes of a Mach-O load command.
+type LoadBytes []byte
+
+func (b LoadBytes) Raw() []byte { return b }
+
+// A SegmentHeader is the header for a Mach-O 32-bit or 64-bit load segment command.
+type SegmentHeader struct {
+	Cmd     LoadCmd
+	Len     uint32
+	Name    string
+	Addr    uint64
+	Memsz   uint64
+	Offset  uint64
+	Filesz  uint64
+	Maxprot uint32
+	Prot    uint32
+	Nsect   uint32
+	Flag    uint32
+}
+
+// A Segment represents a Mach-O 32-bit or 64-bit load segment command.
+type Segment struct {
+	LoadBytes
+	SegmentHeader
+
+	// Embed ReaderAt for ReadAt method.
+	// Do not embed SectionReader directly
+	// to avoid having Read and Seek.
+	// If a client wants Read and Seek it must use
+	// Open() to avoid fighting over the seek offset
+	// with other clients.
+	io.ReaderAt
+	sr *io.SectionReader
+}
+
+// Data reads and returns the contents of the segment.
+func (s *Segment) Data() ([]byte, error) {
+	dat := make([]byte, s.sr.Size())
+	n, err := s.sr.ReadAt(dat, 0)
+	if n == len(dat) {
+		err = nil
+	}
+	return dat[0:n], err
+}
+
+// Open returns a new ReadSeeker reading the segment.
+func (s *Segment) Open() io.ReadSeeker { return io.NewSectionReader(s.sr, 0, 1<<63-1) }
+
+type SectionHeader struct {
+	Name   string
+	Seg    string
+	Addr   uint64
+	Size   uint64
+	Offset uint32
+	Align  uint32
+	Reloff uint32
+	Nreloc uint32
+	Flags  uint32
+}
+
+// A Reloc represents a Mach-O relocation.
+type Reloc struct {
+	Addr  uint32
+	Value uint32
+	// when Scattered == false && Extern == true, Value is the symbol number.
+	// when Scattered == false && Extern == false, Value is the section number.
+	// when Scattered == true, Value is the value that this reloc refers to.
+	Type      uint8
+	Len       uint8 // 0=byte, 1=word, 2=long, 3=quad
+	Pcrel     bool
+	Extern    bool // valid if Scattered == false
+	Scattered bool
+}
+
+type Section struct {
+	SectionHeader
+	Relocs []Reloc
+
+	// Embed ReaderAt for ReadAt method.
+	// Do not embed SectionReader directly
+	// to avoid having Read and Seek.
+	// If a client wants Read and Seek it must use
+	// Open() to avoid fighting over the seek offset
+	// with other clients.
+	io.ReaderAt
+	sr *io.SectionReader
+}
+
+// Data reads and returns the contents of the Mach-O section.
+func (s *Section) Data() ([]byte, error) {
+	dat := make([]byte, s.sr.Size())
+	n, err := s.sr.ReadAt(dat, 0)
+	if n == len(dat) {
+		err = nil
+	}
+	return dat[0:n], err
+}
+
+// Open returns a new ReadSeeker reading the Mach-O section.
+func (s *Section) Open() io.ReadSeeker { return io.NewSectionReader(s.sr, 0, 1<<63-1) }
+
+// A Dylib represents a Mach-O load dynamic library command.
+type Dylib struct {
+	LoadBytes
+	Name           string
+	Time           uint32
+	CurrentVersion uint32
+	CompatVersion  uint32
+}
+
+// A Symtab represents a Mach-O symbol table command.
+type Symtab struct {
+	LoadBytes
+	SymtabCmd
+	Syms []Symbol
+}
+
+// A Dysymtab represents a Mach-O dynamic symbol table command.
+type Dysymtab struct {
+	LoadBytes
+	DysymtabCmd
+	IndirectSyms []uint32 // indices into Symtab.Syms
+}
+
+// A Rpath represents a Mach-O rpath command.
+type Rpath struct {
+	LoadBytes
+	Path string
+}
+
+// A Symbol is a Mach-O 32-bit or 64-bit symbol table entry.
+type Symbol struct {
+	Name  string
+	Type  uint8
+	Sect  uint8
+	Desc  uint16
+	Value uint64
+}
+
+/*
+ * Mach-O reader
+ */
+
+// FormatError is returned by some operations if the data does
+// not have the correct format for an object file.
+type FormatError struct {
+	off int64
+	msg string
+	val interface{}
+}
+
+func (e *FormatError) Error() string {
+	msg := e.msg
+	if e.val != nil {
+		msg += fmt.Sprintf(" '%v'", e.val)
+	}
+	msg += fmt.Sprintf(" in record at byte %#x", e.off)
+	return msg
+}
+
+// Open opens the named file using os.Open and prepares it for use as a Mach-O binary.
+func Open(name string) (*File, error) {
+	f, err := os.Open(name)
+	if err != nil {
+		return nil, err
+	}
+	ff, err := NewFile(f)
+	if err != nil {
+		f.Close()
+		return nil, err
+	}
+	ff.closer = f
+	return ff, nil
+}
+
+// Close closes the File.
+// If the File was created using NewFile directly instead of Open,
+// Close has no effect.
+func (f *File) Close() error {
+	var err error
+	if f.closer != nil {
+		err = f.closer.Close()
+		f.closer = nil
+	}
+	return err
+}
+
+// NewFile creates a new File for accessing a Mach-O binary in an underlying reader.
+// The Mach-O binary is expected to start at position 0 in the ReaderAt.
+func NewFile(r io.ReaderAt) (*File, error) {
+	f := new(File)
+	sr := io.NewSectionReader(r, 0, 1<<63-1)
+
+	// Read and decode Mach magic to determine byte order, size.
+	// Magic32 and Magic64 differ only in the bottom bit.
+	var ident [4]byte
+	if _, err := r.ReadAt(ident[0:], 0); err != nil {
+		return nil, err
+	}
+	be := binary.BigEndian.Uint32(ident[0:])
+	le := binary.LittleEndian.Uint32(ident[0:])
+	switch Magic32 &^ 1 {
+	case be &^ 1:
+		f.ByteOrder = binary.BigEndian
+		f.Magic = be
+	case le &^ 1:
+		f.ByteOrder = binary.LittleEndian
+		f.Magic = le
+	default:
+		return nil, &FormatError{0, "invalid magic number", nil}
+	}
+
+	// Read entire file header.
+	if err := binary.Read(sr, f.ByteOrder, &f.FileHeader); err != nil {
+		return nil, err
+	}
+
+	// Then load commands.
+	offset := int64(fileHeaderSize32)
+	if f.Magic == Magic64 {
+		offset = fileHeaderSize64
+	}
+	dat := make([]byte, f.Cmdsz)
+	if _, err := r.ReadAt(dat, offset); err != nil {
+		return nil, err
+	}
+	f.Loads = make([]Load, f.Ncmd)
+	bo := f.ByteOrder
+	for i := range f.Loads {
+		// Each load command begins with uint32 command and length.
+		if len(dat) < 8 {
+			return nil, &FormatError{offset, "command block too small", nil}
+		}
+		cmd, siz := LoadCmd(bo.Uint32(dat[0:4])), bo.Uint32(dat[4:8])
+		if siz < 8 || siz > uint32(len(dat)) {
+			return nil, &FormatError{offset, "invalid command block size", nil}
+		}
+		var cmddat []byte
+		cmddat, dat = dat[0:siz], dat[siz:]
+		offset += int64(siz)
+		var s *Segment
+		switch cmd {
+		default:
+			f.Loads[i] = LoadBytes(cmddat)
+
+		case LoadCmdRpath:
+			var hdr RpathCmd
+			b := bytes.NewReader(cmddat)
+			if err := binary.Read(b, bo, &hdr); err != nil {
+				return nil, err
+			}
+			l := new(Rpath)
+			if hdr.Path >= uint32(len(cmddat)) {
+				return nil, &FormatError{offset, "invalid path in rpath command", hdr.Path}
+			}
+			l.Path = cstring(cmddat[hdr.Path:])
+			l.LoadBytes = LoadBytes(cmddat)
+			f.Loads[i] = l
+
+		case LoadCmdDylib:
+			var hdr DylibCmd
+			b := bytes.NewReader(cmddat)
+			if err := binary.Read(b, bo, &hdr); err != nil {
+				return nil, err
+			}
+			l := new(Dylib)
+			if hdr.Name >= uint32(len(cmddat)) {
+				return nil, &FormatError{offset, "invalid name in dynamic library command", hdr.Name}
+			}
+			l.Name = cstring(cmddat[hdr.Name:])
+			l.Time = hdr.Time
+			l.CurrentVersion = hdr.CurrentVersion
+			l.CompatVersion = hdr.CompatVersion
+			l.LoadBytes = LoadBytes(cmddat)
+			f.Loads[i] = l
+
+		case LoadCmdSymtab:
+			var hdr SymtabCmd
+			b := bytes.NewReader(cmddat)
+			if err := binary.Read(b, bo, &hdr); err != nil {
+				return nil, err
+			}
+			strtab := make([]byte, hdr.Strsize)
+			if _, err := r.ReadAt(strtab, int64(hdr.Stroff)); err != nil {
+				return nil, err
+			}
+			var symsz int
+			if f.Magic == Magic64 {
+				symsz = 16
+			} else {
+				symsz = 12
+			}
+			symdat := make([]byte, int(hdr.Nsyms)*symsz)
+			if _, err := r.ReadAt(symdat, int64(hdr.Symoff)); err != nil {
+				return nil, err
+			}
+			st, err := f.parseSymtab(symdat, strtab, cmddat, &hdr, offset)
+			if err != nil {
+				return nil, err
+			}
+			f.Loads[i] = st
+			f.Symtab = st
+
+		case LoadCmdDysymtab:
+			var hdr DysymtabCmd
+			b := bytes.NewReader(cmddat)
+			if err := binary.Read(b, bo, &hdr); err != nil {
+				return nil, err
+			}
+			if hdr.Iundefsym > uint32(len(f.Symtab.Syms)) {
+				return nil, &FormatError{offset, fmt.Sprintf(
+					"undefined symbols index in dynamic symbol table command is greater than symbol table length (%d > %d)",
+					hdr.Iundefsym, len(f.Symtab.Syms)), nil}
+			} else if hdr.Iundefsym+hdr.Nundefsym > uint32(len(f.Symtab.Syms)) {
+				return nil, &FormatError{offset, fmt.Sprintf(
+					"number of undefined symbols after index in dynamic symbol table command is greater than symbol table length (%d > %d)",
+					hdr.Iundefsym+hdr.Nundefsym, len(f.Symtab.Syms)), nil}
+			}
+			dat := make([]byte, hdr.Nindirectsyms*4)
+			if _, err := r.ReadAt(dat, int64(hdr.Indirectsymoff)); err != nil {
+				return nil, err
+			}
+			x := make([]uint32, hdr.Nindirectsyms)
+			if err := binary.Read(bytes.NewReader(dat), bo, x); err != nil {
+				return nil, err
+			}
+			st := new(Dysymtab)
+			st.LoadBytes = LoadBytes(cmddat)
+			st.DysymtabCmd = hdr
+			st.IndirectSyms = x
+			f.Loads[i] = st
+			f.Dysymtab = st
+
+		case LoadCmdSegment:
+			var seg32 Segment32
+			b := bytes.NewReader(cmddat)
+			if err := binary.Read(b, bo, &seg32); err != nil {
+				return nil, err
+			}
+			s = new(Segment)
+			s.LoadBytes = cmddat
+			s.Cmd = cmd
+			s.Len = siz
+			s.Name = cstring(seg32.Name[0:])
+			s.Addr = uint64(seg32.Addr)
+			s.Memsz = uint64(seg32.Memsz)
+			s.Offset = uint64(seg32.Offset)
+			s.Filesz = uint64(seg32.Filesz)
+			s.Maxprot = seg32.Maxprot
+			s.Prot = seg32.Prot
+			s.Nsect = seg32.Nsect
+			s.Flag = seg32.Flag
+			f.Loads[i] = s
+			for i := 0; i < int(s.Nsect); i++ {
+				var sh32 Section32
+				if err := binary.Read(b, bo, &sh32); err != nil {
+					return nil, err
+				}
+				sh := new(Section)
+				sh.Name = cstring(sh32.Name[0:])
+				sh.Seg = cstring(sh32.Seg[0:])
+				sh.Addr = uint64(sh32.Addr)
+				sh.Size = uint64(sh32.Size)
+				sh.Offset = sh32.Offset
+				sh.Align = sh32.Align
+				sh.Reloff = sh32.Reloff
+				sh.Nreloc = sh32.Nreloc
+				sh.Flags = sh32.Flags
+				if err := f.pushSection(sh, r); err != nil {
+					return nil, err
+				}
+			}
+
+		case LoadCmdSegment64:
+			var seg64 Segment64
+			b := bytes.NewReader(cmddat)
+			if err := binary.Read(b, bo, &seg64); err != nil {
+				return nil, err
+			}
+			s = new(Segment)
+			s.LoadBytes = cmddat
+			s.Cmd = cmd
+			s.Len = siz
+			s.Name = cstring(seg64.Name[0:])
+			s.Addr = seg64.Addr
+			s.Memsz = seg64.Memsz
+			s.Offset = seg64.Offset
+			s.Filesz = seg64.Filesz
+			s.Maxprot = seg64.Maxprot
+			s.Prot = seg64.Prot
+			s.Nsect = seg64.Nsect
+			s.Flag = seg64.Flag
+			f.Loads[i] = s
+			for i := 0; i < int(s.Nsect); i++ {
+				var sh64 Section64
+				if err := binary.Read(b, bo, &sh64); err != nil {
+					return nil, err
+				}
+				sh := new(Section)
+				sh.Name = cstring(sh64.Name[0:])
+				sh.Seg = cstring(sh64.Seg[0:])
+				sh.Addr = sh64.Addr
+				sh.Size = sh64.Size
+				sh.Offset = sh64.Offset
+				sh.Align = sh64.Align
+				sh.Reloff = sh64.Reloff
+				sh.Nreloc = sh64.Nreloc
+				sh.Flags = sh64.Flags
+				if err := f.pushSection(sh, r); err != nil {
+					return nil, err
+				}
+			}
+		}
+		if s != nil {
+			s.sr = io.NewSectionReader(r, int64(s.Offset), int64(s.Filesz))
+			s.ReaderAt = s.sr
+		}
+	}
+	return f, nil
+}
+
+func (f *File) parseSymtab(symdat, strtab, cmddat []byte, hdr *SymtabCmd, offset int64) (*Symtab, error) {
+	bo := f.ByteOrder
+	symtab := make([]Symbol, hdr.Nsyms)
+	b := bytes.NewReader(symdat)
+	for i := range symtab {
+		var n Nlist64
+		if f.Magic == Magic64 {
+			if err := binary.Read(b, bo, &n); err != nil {
+				return nil, err
+			}
+		} else {
+			var n32 Nlist32
+			if err := binary.Read(b, bo, &n32); err != nil {
+				return nil, err
+			}
+			n.Name = n32.Name
+			n.Type = n32.Type
+			n.Sect = n32.Sect
+			n.Desc = n32.Desc
+			n.Value = uint64(n32.Value)
+		}
+		sym := &symtab[i]
+		if n.Name >= uint32(len(strtab)) {
+			return nil, &FormatError{offset, "invalid name in symbol table", n.Name}
+		}
+		// We add "_" to Go symbols. Strip it here. See issue 33808.
+		name := cstring(strtab[n.Name:])
+		if strings.Contains(name, ".") && name[0] == '_' {
+			name = name[1:]
+		}
+		sym.Name = name
+		sym.Type = n.Type
+		sym.Sect = n.Sect
+		sym.Desc = n.Desc
+		sym.Value = n.Value
+	}
+	st := new(Symtab)
+	st.LoadBytes = LoadBytes(cmddat)
+	st.Syms = symtab
+	return st, nil
+}
+
+type relocInfo struct {
+	Addr   uint32
+	Symnum uint32
+}
+
+func (f *File) pushSection(sh *Section, r io.ReaderAt) error {
+	f.Sections = append(f.Sections, sh)
+	sh.sr = io.NewSectionReader(r, int64(sh.Offset), int64(sh.Size))
+	sh.ReaderAt = sh.sr
+
+	if sh.Nreloc > 0 {
+		reldat := make([]byte, int(sh.Nreloc)*8)
+		if _, err := r.ReadAt(reldat, int64(sh.Reloff)); err != nil {
+			return err
+		}
+		b := bytes.NewReader(reldat)
+
+		bo := f.ByteOrder
+
+		sh.Relocs = make([]Reloc, sh.Nreloc)
+		for i := range sh.Relocs {
+			rel := &sh.Relocs[i]
+
+			var ri relocInfo
+			if err := binary.Read(b, bo, &ri); err != nil {
+				return err
+			}
+
+			if ri.Addr&(1<<31) != 0 { // scattered
+				rel.Addr = ri.Addr & (1<<24 - 1)
+				rel.Type = uint8((ri.Addr >> 24) & (1<<4 - 1))
+				rel.Len = uint8((ri.Addr >> 28) & (1<<2 - 1))
+				rel.Pcrel = ri.Addr&(1<<30) != 0
+				rel.Value = ri.Symnum
+				rel.Scattered = true
+			} else {
+				switch bo {
+				case binary.LittleEndian:
+					rel.Addr = ri.Addr
+					rel.Value = ri.Symnum & (1<<24 - 1)
+					rel.Pcrel = ri.Symnum&(1<<24) != 0
+					rel.Len = uint8((ri.Symnum >> 25) & (1<<2 - 1))
+					rel.Extern = ri.Symnum&(1<<27) != 0
+					rel.Type = uint8((ri.Symnum >> 28) & (1<<4 - 1))
+				case binary.BigEndian:
+					rel.Addr = ri.Addr
+					rel.Value = ri.Symnum >> 8
+					rel.Pcrel = ri.Symnum&(1<<7) != 0
+					rel.Len = uint8((ri.Symnum >> 5) & (1<<2 - 1))
+					rel.Extern = ri.Symnum&(1<<4) != 0
+					rel.Type = uint8(ri.Symnum & (1<<4 - 1))
+				default:
+					panic("unreachable")
+				}
+			}
+		}
+	}
+
+	return nil
+}
+
+func cstring(b []byte) string {
+	i := bytes.IndexByte(b, 0)
+	if i == -1 {
+		i = len(b)
+	}
+	return string(b[0:i])
+}
+
+// Segment returns the first Segment with the given name, or nil if no such segment exists.
+func (f *File) Segment(name string) *Segment {
+	for _, l := range f.Loads {
+		if s, ok := l.(*Segment); ok && s.Name == name {
+			return s
+		}
+	}
+	return nil
+}
+
+// Section returns the first section with the given name, or nil if no such
+// section exists.
+func (f *File) Section(name string) *Section {
+	for _, s := range f.Sections {
+		if s.Name == name {
+			return s
+		}
+	}
+	return nil
+}
+
+// DWARF returns the DWARF debug information for the Mach-O file.
+func (f *File) DWARF() (*dwarf.Data, error) {
+	dwarfSuffix := func(s *Section) string {
+		switch {
+		case strings.HasPrefix(s.Name, "__debug_"):
+			return s.Name[8:]
+		case strings.HasPrefix(s.Name, "__zdebug_"):
+			return s.Name[9:]
+		default:
+			return ""
+		}
+
+	}
+	sectionData := func(s *Section) ([]byte, error) {
+		b, err := s.Data()
+		if err != nil && uint64(len(b)) < s.Size {
+			return nil, err
+		}
+
+		if len(b) >= 12 && string(b[:4]) == "ZLIB" {
+			dlen := binary.BigEndian.Uint64(b[4:12])
+			dbuf := make([]byte, dlen)
+			r, err := zlib.NewReader(bytes.NewBuffer(b[12:]))
+			if err != nil {
+				return nil, err
+			}
+			if _, err := io.ReadFull(r, dbuf); err != nil {
+				return nil, err
+			}
+			if err := r.Close(); err != nil {
+				return nil, err
+			}
+			b = dbuf
+		}
+		return b, nil
+	}
+
+	// There are many other DWARF sections, but these
+	// are the ones the debug/dwarf package uses.
+	// Don't bother loading others.
+	var dat = map[string][]byte{"abbrev": nil, "info": nil, "str": nil, "line": nil, "ranges": nil}
+	for _, s := range f.Sections {
+		suffix := dwarfSuffix(s)
+		if suffix == "" {
+			continue
+		}
+		if _, ok := dat[suffix]; !ok {
+			continue
+		}
+		b, err := sectionData(s)
+		if err != nil {
+			return nil, err
+		}
+		dat[suffix] = b
+	}
+
+	d, err := dwarf.New(dat["abbrev"], nil, nil, dat["info"], dat["line"], nil, dat["ranges"], dat["str"])
+	if err != nil {
+		return nil, err
+	}
+
+	// Look for DWARF4 .debug_types sections and DWARF5 sections.
+	for i, s := range f.Sections {
+		suffix := dwarfSuffix(s)
+		if suffix == "" {
+			continue
+		}
+		if _, ok := dat[suffix]; ok {
+			// Already handled.
+			continue
+		}
+
+		b, err := sectionData(s)
+		if err != nil {
+			return nil, err
+		}
+
+		if suffix == "types" {
+			err = d.AddTypes(fmt.Sprintf("types-%d", i), b)
+		} else {
+			err = d.AddSection(".debug_"+suffix, b)
+		}
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	return d, nil
+}
+
+// ImportedSymbols returns the names of all symbols
+// referred to by the binary f that are expected to be
+// satisfied by other libraries at dynamic load time.
+func (f *File) ImportedSymbols() ([]string, error) {
+	if f.Dysymtab == nil || f.Symtab == nil {
+		return nil, &FormatError{0, "missing symbol table", nil}
+	}
+
+	st := f.Symtab
+	dt := f.Dysymtab
+	var all []string
+	for _, s := range st.Syms[dt.Iundefsym : dt.Iundefsym+dt.Nundefsym] {
+		all = append(all, s.Name)
+	}
+	return all, nil
+}
+
+// ImportedLibraries returns the paths of all libraries
+// referred to by the binary f that are expected to be
+// linked with the binary at dynamic link time.
+func (f *File) ImportedLibraries() ([]string, error) {
+	var all []string
+	for _, l := range f.Loads {
+		if lib, ok := l.(*Dylib); ok {
+			all = append(all, lib.Name)
+		}
+	}
+	return all, nil
+}
diff --git a/src/debug/macho/file_test.go b/src/debug/macho/file_test.go
new file mode 100644
index 0000000..9beeb80
--- /dev/null
+++ b/src/debug/macho/file_test.go
@@ -0,0 +1,425 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package macho
+
+import (
+	"bytes"
+	"internal/obscuretestdata"
+	"io"
+	"reflect"
+	"testing"
+)
+
+type fileTest struct {
+	file        string
+	hdr         FileHeader
+	loads       []interface{}
+	sections    []*SectionHeader
+	relocations map[string][]Reloc
+}
+
+var fileTests = []fileTest{
+	{
+		"testdata/gcc-386-darwin-exec.base64",
+		FileHeader{0xfeedface, Cpu386, 0x3, 0x2, 0xc, 0x3c0, 0x85},
+		[]interface{}{
+			&SegmentHeader{LoadCmdSegment, 0x38, "__PAGEZERO", 0x0, 0x1000, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},
+			&SegmentHeader{LoadCmdSegment, 0xc0, "__TEXT", 0x1000, 0x1000, 0x0, 0x1000, 0x7, 0x5, 0x2, 0x0},
+			&SegmentHeader{LoadCmdSegment, 0xc0, "__DATA", 0x2000, 0x1000, 0x1000, 0x1000, 0x7, 0x3, 0x2, 0x0},
+			&SegmentHeader{LoadCmdSegment, 0x7c, "__IMPORT", 0x3000, 0x1000, 0x2000, 0x1000, 0x7, 0x7, 0x1, 0x0},
+			&SegmentHeader{LoadCmdSegment, 0x38, "__LINKEDIT", 0x4000, 0x1000, 0x3000, 0x12c, 0x7, 0x1, 0x0, 0x0},
+			nil, // LC_SYMTAB
+			nil, // LC_DYSYMTAB
+			nil, // LC_LOAD_DYLINKER
+			nil, // LC_UUID
+			nil, // LC_UNIXTHREAD
+			&Dylib{nil, "/usr/lib/libgcc_s.1.dylib", 0x2, 0x10000, 0x10000},
+			&Dylib{nil, "/usr/lib/libSystem.B.dylib", 0x2, 0x6f0104, 0x10000},
+		},
+		[]*SectionHeader{
+			{"__text", "__TEXT", 0x1f68, 0x88, 0xf68, 0x2, 0x0, 0x0, 0x80000400},
+			{"__cstring", "__TEXT", 0x1ff0, 0xd, 0xff0, 0x0, 0x0, 0x0, 0x2},
+			{"__data", "__DATA", 0x2000, 0x14, 0x1000, 0x2, 0x0, 0x0, 0x0},
+			{"__dyld", "__DATA", 0x2014, 0x1c, 0x1014, 0x2, 0x0, 0x0, 0x0},
+			{"__jump_table", "__IMPORT", 0x3000, 0xa, 0x2000, 0x6, 0x0, 0x0, 0x4000008},
+		},
+		nil,
+	},
+	{
+		"testdata/gcc-amd64-darwin-exec.base64",
+		FileHeader{0xfeedfacf, CpuAmd64, 0x80000003, 0x2, 0xb, 0x568, 0x85},
+		[]interface{}{
+			&SegmentHeader{LoadCmdSegment64, 0x48, "__PAGEZERO", 0x0, 0x100000000, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},
+			&SegmentHeader{LoadCmdSegment64, 0x1d8, "__TEXT", 0x100000000, 0x1000, 0x0, 0x1000, 0x7, 0x5, 0x5, 0x0},
+			&SegmentHeader{LoadCmdSegment64, 0x138, "__DATA", 0x100001000, 0x1000, 0x1000, 0x1000, 0x7, 0x3, 0x3, 0x0},
+			&SegmentHeader{LoadCmdSegment64, 0x48, "__LINKEDIT", 0x100002000, 0x1000, 0x2000, 0x140, 0x7, 0x1, 0x0, 0x0},
+			nil, // LC_SYMTAB
+			nil, // LC_DYSYMTAB
+			nil, // LC_LOAD_DYLINKER
+			nil, // LC_UUID
+			nil, // LC_UNIXTHREAD
+			&Dylib{nil, "/usr/lib/libgcc_s.1.dylib", 0x2, 0x10000, 0x10000},
+			&Dylib{nil, "/usr/lib/libSystem.B.dylib", 0x2, 0x6f0104, 0x10000},
+		},
+		[]*SectionHeader{
+			{"__text", "__TEXT", 0x100000f14, 0x6d, 0xf14, 0x2, 0x0, 0x0, 0x80000400},
+			{"__symbol_stub1", "__TEXT", 0x100000f81, 0xc, 0xf81, 0x0, 0x0, 0x0, 0x80000408},
+			{"__stub_helper", "__TEXT", 0x100000f90, 0x18, 0xf90, 0x2, 0x0, 0x0, 0x0},
+			{"__cstring", "__TEXT", 0x100000fa8, 0xd, 0xfa8, 0x0, 0x0, 0x0, 0x2},
+			{"__eh_frame", "__TEXT", 0x100000fb8, 0x48, 0xfb8, 0x3, 0x0, 0x0, 0x6000000b},
+			{"__data", "__DATA", 0x100001000, 0x1c, 0x1000, 0x3, 0x0, 0x0, 0x0},
+			{"__dyld", "__DATA", 0x100001020, 0x38, 0x1020, 0x3, 0x0, 0x0, 0x0},
+			{"__la_symbol_ptr", "__DATA", 0x100001058, 0x10, 0x1058, 0x2, 0x0, 0x0, 0x7},
+		},
+		nil,
+	},
+	{
+		"testdata/gcc-amd64-darwin-exec-debug.base64",
+		FileHeader{0xfeedfacf, CpuAmd64, 0x80000003, 0xa, 0x4, 0x5a0, 0},
+		[]interface{}{
+			nil, // LC_UUID
+			&SegmentHeader{LoadCmdSegment64, 0x1d8, "__TEXT", 0x100000000, 0x1000, 0x0, 0x0, 0x7, 0x5, 0x5, 0x0},
+			&SegmentHeader{LoadCmdSegment64, 0x138, "__DATA", 0x100001000, 0x1000, 0x0, 0x0, 0x7, 0x3, 0x3, 0x0},
+			&SegmentHeader{LoadCmdSegment64, 0x278, "__DWARF", 0x100002000, 0x1000, 0x1000, 0x1bc, 0x7, 0x3, 0x7, 0x0},
+		},
+		[]*SectionHeader{
+			{"__text", "__TEXT", 0x100000f14, 0x0, 0x0, 0x2, 0x0, 0x0, 0x80000400},
+			{"__symbol_stub1", "__TEXT", 0x100000f81, 0x0, 0x0, 0x0, 0x0, 0x0, 0x80000408},
+			{"__stub_helper", "__TEXT", 0x100000f90, 0x0, 0x0, 0x2, 0x0, 0x0, 0x0},
+			{"__cstring", "__TEXT", 0x100000fa8, 0x0, 0x0, 0x0, 0x0, 0x0, 0x2},
+			{"__eh_frame", "__TEXT", 0x100000fb8, 0x0, 0x0, 0x3, 0x0, 0x0, 0x6000000b},
+			{"__data", "__DATA", 0x100001000, 0x0, 0x0, 0x3, 0x0, 0x0, 0x0},
+			{"__dyld", "__DATA", 0x100001020, 0x0, 0x0, 0x3, 0x0, 0x0, 0x0},
+			{"__la_symbol_ptr", "__DATA", 0x100001058, 0x0, 0x0, 0x2, 0x0, 0x0, 0x7},
+			{"__debug_abbrev", "__DWARF", 0x100002000, 0x36, 0x1000, 0x0, 0x0, 0x0, 0x0},
+			{"__debug_aranges", "__DWARF", 0x100002036, 0x30, 0x1036, 0x0, 0x0, 0x0, 0x0},
+			{"__debug_frame", "__DWARF", 0x100002066, 0x40, 0x1066, 0x0, 0x0, 0x0, 0x0},
+			{"__debug_info", "__DWARF", 0x1000020a6, 0x54, 0x10a6, 0x0, 0x0, 0x0, 0x0},
+			{"__debug_line", "__DWARF", 0x1000020fa, 0x47, 0x10fa, 0x0, 0x0, 0x0, 0x0},
+			{"__debug_pubnames", "__DWARF", 0x100002141, 0x1b, 0x1141, 0x0, 0x0, 0x0, 0x0},
+			{"__debug_str", "__DWARF", 0x10000215c, 0x60, 0x115c, 0x0, 0x0, 0x0, 0x0},
+		},
+		nil,
+	},
+	{
+		"testdata/clang-386-darwin-exec-with-rpath.base64",
+		FileHeader{0xfeedface, Cpu386, 0x3, 0x2, 0x10, 0x42c, 0x1200085},
+		[]interface{}{
+			nil, // LC_SEGMENT
+			nil, // LC_SEGMENT
+			nil, // LC_SEGMENT
+			nil, // LC_SEGMENT
+			nil, // LC_DYLD_INFO_ONLY
+			nil, // LC_SYMTAB
+			nil, // LC_DYSYMTAB
+			nil, // LC_LOAD_DYLINKER
+			nil, // LC_UUID
+			nil, // LC_VERSION_MIN_MACOSX
+			nil, // LC_SOURCE_VERSION
+			nil, // LC_MAIN
+			nil, // LC_LOAD_DYLIB
+			&Rpath{nil, "/my/rpath"},
+			nil, // LC_FUNCTION_STARTS
+			nil, // LC_DATA_IN_CODE
+		},
+		nil,
+		nil,
+	},
+	{
+		"testdata/clang-amd64-darwin-exec-with-rpath.base64",
+		FileHeader{0xfeedfacf, CpuAmd64, 0x80000003, 0x2, 0x10, 0x4c8, 0x200085},
+		[]interface{}{
+			nil, // LC_SEGMENT
+			nil, // LC_SEGMENT
+			nil, // LC_SEGMENT
+			nil, // LC_SEGMENT
+			nil, // LC_DYLD_INFO_ONLY
+			nil, // LC_SYMTAB
+			nil, // LC_DYSYMTAB
+			nil, // LC_LOAD_DYLINKER
+			nil, // LC_UUID
+			nil, // LC_VERSION_MIN_MACOSX
+			nil, // LC_SOURCE_VERSION
+			nil, // LC_MAIN
+			nil, // LC_LOAD_DYLIB
+			&Rpath{nil, "/my/rpath"},
+			nil, // LC_FUNCTION_STARTS
+			nil, // LC_DATA_IN_CODE
+		},
+		nil,
+		nil,
+	},
+	{
+		"testdata/clang-386-darwin.obj.base64",
+		FileHeader{0xfeedface, Cpu386, 0x3, 0x1, 0x4, 0x138, 0x2000},
+		nil,
+		nil,
+		map[string][]Reloc{
+			"__text": {
+				{
+					Addr:      0x1d,
+					Type:      uint8(GENERIC_RELOC_VANILLA),
+					Len:       2,
+					Pcrel:     true,
+					Extern:    true,
+					Value:     1,
+					Scattered: false,
+				},
+				{
+					Addr:      0xe,
+					Type:      uint8(GENERIC_RELOC_LOCAL_SECTDIFF),
+					Len:       2,
+					Pcrel:     false,
+					Value:     0x2d,
+					Scattered: true,
+				},
+				{
+					Addr:      0x0,
+					Type:      uint8(GENERIC_RELOC_PAIR),
+					Len:       2,
+					Pcrel:     false,
+					Value:     0xb,
+					Scattered: true,
+				},
+			},
+		},
+	},
+	{
+		"testdata/clang-amd64-darwin.obj.base64",
+		FileHeader{0xfeedfacf, CpuAmd64, 0x3, 0x1, 0x4, 0x200, 0x2000},
+		nil,
+		nil,
+		map[string][]Reloc{
+			"__text": {
+				{
+					Addr:   0x19,
+					Type:   uint8(X86_64_RELOC_BRANCH),
+					Len:    2,
+					Pcrel:  true,
+					Extern: true,
+					Value:  1,
+				},
+				{
+					Addr:   0xb,
+					Type:   uint8(X86_64_RELOC_SIGNED),
+					Len:    2,
+					Pcrel:  true,
+					Extern: false,
+					Value:  2,
+				},
+			},
+			"__compact_unwind": {
+				{
+					Addr:   0x0,
+					Type:   uint8(X86_64_RELOC_UNSIGNED),
+					Len:    3,
+					Pcrel:  false,
+					Extern: false,
+					Value:  1,
+				},
+			},
+		},
+	},
+}
+
+func readerAtFromObscured(name string) (io.ReaderAt, error) {
+	b, err := obscuretestdata.ReadFile(name)
+	if err != nil {
+		return nil, err
+	}
+	return bytes.NewReader(b), nil
+}
+
+func openObscured(name string) (*File, error) {
+	ra, err := readerAtFromObscured(name)
+	if err != nil {
+		return nil, err
+	}
+	ff, err := NewFile(ra)
+	if err != nil {
+		return nil, err
+	}
+	return ff, nil
+}
+
+func openFatObscured(name string) (*FatFile, error) {
+	ra, err := readerAtFromObscured(name)
+	if err != nil {
+		return nil, err
+	}
+	ff, err := NewFatFile(ra)
+	if err != nil {
+		return nil, err
+	}
+	return ff, nil
+}
+
+func TestOpen(t *testing.T) {
+	for i := range fileTests {
+		tt := &fileTests[i]
+
+		// Use obscured files to prevent Apple’s notarization service from
+		// mistaking them as candidates for notarization and rejecting the entire
+		// toolchain.
+		// See golang.org/issue/34986
+		f, err := openObscured(tt.file)
+		if err != nil {
+			t.Error(err)
+			continue
+		}
+		if !reflect.DeepEqual(f.FileHeader, tt.hdr) {
+			t.Errorf("open %s:\n\thave %#v\n\twant %#v\n", tt.file, f.FileHeader, tt.hdr)
+			continue
+		}
+		for i, l := range f.Loads {
+			if len(l.Raw()) < 8 {
+				t.Errorf("open %s, command %d:\n\tload command %T don't have enough data\n", tt.file, i, l)
+			}
+		}
+		if tt.loads != nil {
+			for i, l := range f.Loads {
+				if i >= len(tt.loads) {
+					break
+				}
+
+				want := tt.loads[i]
+				if want == nil {
+					continue
+				}
+
+				switch l := l.(type) {
+				case *Segment:
+					have := &l.SegmentHeader
+					if !reflect.DeepEqual(have, want) {
+						t.Errorf("open %s, command %d:\n\thave %#v\n\twant %#v\n", tt.file, i, have, want)
+					}
+				case *Dylib:
+					have := l
+					have.LoadBytes = nil
+					if !reflect.DeepEqual(have, want) {
+						t.Errorf("open %s, command %d:\n\thave %#v\n\twant %#v\n", tt.file, i, have, want)
+					}
+				case *Rpath:
+					have := l
+					have.LoadBytes = nil
+					if !reflect.DeepEqual(have, want) {
+						t.Errorf("open %s, command %d:\n\thave %#v\n\twant %#v\n", tt.file, i, have, want)
+					}
+				default:
+					t.Errorf("open %s, command %d: unknown load command\n\thave %#v\n\twant %#v\n", tt.file, i, l, want)
+				}
+			}
+			tn := len(tt.loads)
+			fn := len(f.Loads)
+			if tn != fn {
+				t.Errorf("open %s: len(Loads) = %d, want %d", tt.file, fn, tn)
+			}
+		}
+
+		if tt.sections != nil {
+			for i, sh := range f.Sections {
+				if i >= len(tt.sections) {
+					break
+				}
+				have := &sh.SectionHeader
+				want := tt.sections[i]
+				if !reflect.DeepEqual(have, want) {
+					t.Errorf("open %s, section %d:\n\thave %#v\n\twant %#v\n", tt.file, i, have, want)
+				}
+			}
+			tn := len(tt.sections)
+			fn := len(f.Sections)
+			if tn != fn {
+				t.Errorf("open %s: len(Sections) = %d, want %d", tt.file, fn, tn)
+			}
+		}
+
+		if tt.relocations != nil {
+			for i, sh := range f.Sections {
+				have := sh.Relocs
+				want := tt.relocations[sh.Name]
+				if !reflect.DeepEqual(have, want) {
+					t.Errorf("open %s, relocations in section %d (%s):\n\thave %#v\n\twant %#v\n", tt.file, i, sh.Name, have, want)
+				}
+			}
+		}
+	}
+}
+
+func TestOpenFailure(t *testing.T) {
+	filename := "file.go"    // not a Mach-O file
+	_, err := Open(filename) // don't crash
+	if err == nil {
+		t.Errorf("open %s: succeeded unexpectedly", filename)
+	}
+}
+
+func TestOpenFat(t *testing.T) {
+	ff, err := openFatObscured("testdata/fat-gcc-386-amd64-darwin-exec.base64")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if ff.Magic != MagicFat {
+		t.Errorf("OpenFat: got magic number %#x, want %#x", ff.Magic, MagicFat)
+	}
+	if len(ff.Arches) != 2 {
+		t.Errorf("OpenFat: got %d architectures, want 2", len(ff.Arches))
+	}
+
+	for i := range ff.Arches {
+		arch := &ff.Arches[i]
+		ftArch := &fileTests[i]
+
+		if arch.Cpu != ftArch.hdr.Cpu || arch.SubCpu != ftArch.hdr.SubCpu {
+			t.Errorf("OpenFat: architecture #%d got cpu=%#x subtype=%#x, expected cpu=%#x, subtype=%#x", i, arch.Cpu, arch.SubCpu, ftArch.hdr.Cpu, ftArch.hdr.SubCpu)
+		}
+
+		if !reflect.DeepEqual(arch.FileHeader, ftArch.hdr) {
+			t.Errorf("OpenFat header:\n\tgot %#v\n\twant %#v\n", arch.FileHeader, ftArch.hdr)
+		}
+	}
+}
+
+func TestOpenFatFailure(t *testing.T) {
+	filename := "file.go" // not a Mach-O file
+	if _, err := OpenFat(filename); err == nil {
+		t.Errorf("OpenFat %s: succeeded unexpectedly", filename)
+	}
+
+	filename = "testdata/gcc-386-darwin-exec.base64" // not a fat Mach-O
+	ff, err := openFatObscured(filename)
+	if err != ErrNotFat {
+		t.Errorf("OpenFat %s: got %v, want ErrNotFat", filename, err)
+	}
+	if ff != nil {
+		t.Errorf("OpenFat %s: got %v, want nil", filename, ff)
+	}
+}
+
+func TestRelocTypeString(t *testing.T) {
+	if X86_64_RELOC_BRANCH.String() != "X86_64_RELOC_BRANCH" {
+		t.Errorf("got %v, want %v", X86_64_RELOC_BRANCH.String(), "X86_64_RELOC_BRANCH")
+	}
+	if X86_64_RELOC_BRANCH.GoString() != "macho.X86_64_RELOC_BRANCH" {
+		t.Errorf("got %v, want %v", X86_64_RELOC_BRANCH.GoString(), "macho.X86_64_RELOC_BRANCH")
+	}
+}
+
+func TestTypeString(t *testing.T) {
+	if TypeExec.String() != "Exec" {
+		t.Errorf("got %v, want %v", TypeExec.String(), "Exec")
+	}
+	if TypeExec.GoString() != "macho.Exec" {
+		t.Errorf("got %v, want %v", TypeExec.GoString(), "macho.Exec")
+	}
+}
+
+func TestOpenBadDysymCmd(t *testing.T) {
+	_, err := openObscured("testdata/gcc-amd64-darwin-exec-with-bad-dysym.base64")
+	if err == nil {
+		t.Fatal("openObscured did not fail when opening a file with an invalid dynamic symbol table command")
+	}
+}
diff --git a/src/debug/macho/macho.go b/src/debug/macho/macho.go
new file mode 100644
index 0000000..9fa9f95
--- /dev/null
+++ b/src/debug/macho/macho.go
@@ -0,0 +1,341 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Mach-O header data structures
+// Originally at:
+// http://developer.apple.com/mac/library/documentation/DeveloperTools/Conceptual/MachORuntime/Reference/reference.html (since deleted by Apple)
+// Archived copy at:
+// https://web.archive.org/web/20090819232456/http://developer.apple.com/documentation/DeveloperTools/Conceptual/MachORuntime/index.html
+// For cloned PDF see:
+// https://github.com/aidansteele/osx-abi-macho-file-format-reference
+
+package macho
+
+import "strconv"
+
+// A FileHeader represents a Mach-O file header.
+type FileHeader struct {
+	Magic  uint32
+	Cpu    Cpu
+	SubCpu uint32
+	Type   Type
+	Ncmd   uint32
+	Cmdsz  uint32
+	Flags  uint32
+}
+
+const (
+	fileHeaderSize32 = 7 * 4
+	fileHeaderSize64 = 8 * 4
+)
+
+const (
+	Magic32  uint32 = 0xfeedface
+	Magic64  uint32 = 0xfeedfacf
+	MagicFat uint32 = 0xcafebabe
+)
+
+// A Type is the Mach-O file type, e.g. an object file, executable, or dynamic library.
+type Type uint32
+
+const (
+	TypeObj    Type = 1
+	TypeExec   Type = 2
+	TypeDylib  Type = 6
+	TypeBundle Type = 8
+)
+
+var typeStrings = []intName{
+	{uint32(TypeObj), "Obj"},
+	{uint32(TypeExec), "Exec"},
+	{uint32(TypeDylib), "Dylib"},
+	{uint32(TypeBundle), "Bundle"},
+}
+
+func (t Type) String() string   { return stringName(uint32(t), typeStrings, false) }
+func (t Type) GoString() string { return stringName(uint32(t), typeStrings, true) }
+
+// A Cpu is a Mach-O cpu type.
+type Cpu uint32
+
+const cpuArch64 = 0x01000000
+
+const (
+	Cpu386   Cpu = 7
+	CpuAmd64 Cpu = Cpu386 | cpuArch64
+	CpuArm   Cpu = 12
+	CpuArm64 Cpu = CpuArm | cpuArch64
+	CpuPpc   Cpu = 18
+	CpuPpc64 Cpu = CpuPpc | cpuArch64
+)
+
+var cpuStrings = []intName{
+	{uint32(Cpu386), "Cpu386"},
+	{uint32(CpuAmd64), "CpuAmd64"},
+	{uint32(CpuArm), "CpuArm"},
+	{uint32(CpuArm64), "CpuArm64"},
+	{uint32(CpuPpc), "CpuPpc"},
+	{uint32(CpuPpc64), "CpuPpc64"},
+}
+
+func (i Cpu) String() string   { return stringName(uint32(i), cpuStrings, false) }
+func (i Cpu) GoString() string { return stringName(uint32(i), cpuStrings, true) }
+
+// A LoadCmd is a Mach-O load command.
+type LoadCmd uint32
+
+const (
+	LoadCmdSegment    LoadCmd = 0x1
+	LoadCmdSymtab     LoadCmd = 0x2
+	LoadCmdThread     LoadCmd = 0x4
+	LoadCmdUnixThread LoadCmd = 0x5 // thread+stack
+	LoadCmdDysymtab   LoadCmd = 0xb
+	LoadCmdDylib      LoadCmd = 0xc // load dylib command
+	LoadCmdDylinker   LoadCmd = 0xf // id dylinker command (not load dylinker command)
+	LoadCmdSegment64  LoadCmd = 0x19
+	LoadCmdRpath      LoadCmd = 0x8000001c
+)
+
+var cmdStrings = []intName{
+	{uint32(LoadCmdSegment), "LoadCmdSegment"},
+	{uint32(LoadCmdThread), "LoadCmdThread"},
+	{uint32(LoadCmdUnixThread), "LoadCmdUnixThread"},
+	{uint32(LoadCmdDylib), "LoadCmdDylib"},
+	{uint32(LoadCmdSegment64), "LoadCmdSegment64"},
+	{uint32(LoadCmdRpath), "LoadCmdRpath"},
+}
+
+func (i LoadCmd) String() string   { return stringName(uint32(i), cmdStrings, false) }
+func (i LoadCmd) GoString() string { return stringName(uint32(i), cmdStrings, true) }
+
+type (
+	// A Segment32 is a 32-bit Mach-O segment load command.
+	Segment32 struct {
+		Cmd     LoadCmd
+		Len     uint32
+		Name    [16]byte
+		Addr    uint32
+		Memsz   uint32
+		Offset  uint32
+		Filesz  uint32
+		Maxprot uint32
+		Prot    uint32
+		Nsect   uint32
+		Flag    uint32
+	}
+
+	// A Segment64 is a 64-bit Mach-O segment load command.
+	Segment64 struct {
+		Cmd     LoadCmd
+		Len     uint32
+		Name    [16]byte
+		Addr    uint64
+		Memsz   uint64
+		Offset  uint64
+		Filesz  uint64
+		Maxprot uint32
+		Prot    uint32
+		Nsect   uint32
+		Flag    uint32
+	}
+
+	// A SymtabCmd is a Mach-O symbol table command.
+	SymtabCmd struct {
+		Cmd     LoadCmd
+		Len     uint32
+		Symoff  uint32
+		Nsyms   uint32
+		Stroff  uint32
+		Strsize uint32
+	}
+
+	// A DysymtabCmd is a Mach-O dynamic symbol table command.
+	DysymtabCmd struct {
+		Cmd            LoadCmd
+		Len            uint32
+		Ilocalsym      uint32
+		Nlocalsym      uint32
+		Iextdefsym     uint32
+		Nextdefsym     uint32
+		Iundefsym      uint32
+		Nundefsym      uint32
+		Tocoffset      uint32
+		Ntoc           uint32
+		Modtaboff      uint32
+		Nmodtab        uint32
+		Extrefsymoff   uint32
+		Nextrefsyms    uint32
+		Indirectsymoff uint32
+		Nindirectsyms  uint32
+		Extreloff      uint32
+		Nextrel        uint32
+		Locreloff      uint32
+		Nlocrel        uint32
+	}
+
+	// A DylibCmd is a Mach-O load dynamic library command.
+	DylibCmd struct {
+		Cmd            LoadCmd
+		Len            uint32
+		Name           uint32
+		Time           uint32
+		CurrentVersion uint32
+		CompatVersion  uint32
+	}
+
+	// A RpathCmd is a Mach-O rpath command.
+	RpathCmd struct {
+		Cmd  LoadCmd
+		Len  uint32
+		Path uint32
+	}
+
+	// A Thread is a Mach-O thread state command.
+	Thread struct {
+		Cmd  LoadCmd
+		Len  uint32
+		Type uint32
+		Data []uint32
+	}
+)
+
+const (
+	FlagNoUndefs              uint32 = 0x1
+	FlagIncrLink              uint32 = 0x2
+	FlagDyldLink              uint32 = 0x4
+	FlagBindAtLoad            uint32 = 0x8
+	FlagPrebound              uint32 = 0x10
+	FlagSplitSegs             uint32 = 0x20
+	FlagLazyInit              uint32 = 0x40
+	FlagTwoLevel              uint32 = 0x80
+	FlagForceFlat             uint32 = 0x100
+	FlagNoMultiDefs           uint32 = 0x200
+	FlagNoFixPrebinding       uint32 = 0x400
+	FlagPrebindable           uint32 = 0x800
+	FlagAllModsBound          uint32 = 0x1000
+	FlagSubsectionsViaSymbols uint32 = 0x2000
+	FlagCanonical             uint32 = 0x4000
+	FlagWeakDefines           uint32 = 0x8000
+	FlagBindsToWeak           uint32 = 0x10000
+	FlagAllowStackExecution   uint32 = 0x20000
+	FlagRootSafe              uint32 = 0x40000
+	FlagSetuidSafe            uint32 = 0x80000
+	FlagNoReexportedDylibs    uint32 = 0x100000
+	FlagPIE                   uint32 = 0x200000
+	FlagDeadStrippableDylib   uint32 = 0x400000
+	FlagHasTLVDescriptors     uint32 = 0x800000
+	FlagNoHeapExecution       uint32 = 0x1000000
+	FlagAppExtensionSafe      uint32 = 0x2000000
+)
+
+// A Section32 is a 32-bit Mach-O section header.
+type Section32 struct {
+	Name     [16]byte
+	Seg      [16]byte
+	Addr     uint32
+	Size     uint32
+	Offset   uint32
+	Align    uint32
+	Reloff   uint32
+	Nreloc   uint32
+	Flags    uint32
+	Reserve1 uint32
+	Reserve2 uint32
+}
+
+// A Section64 is a 64-bit Mach-O section header.
+type Section64 struct {
+	Name     [16]byte
+	Seg      [16]byte
+	Addr     uint64
+	Size     uint64
+	Offset   uint32
+	Align    uint32
+	Reloff   uint32
+	Nreloc   uint32
+	Flags    uint32
+	Reserve1 uint32
+	Reserve2 uint32
+	Reserve3 uint32
+}
+
+// An Nlist32 is a Mach-O 32-bit symbol table entry.
+type Nlist32 struct {
+	Name  uint32
+	Type  uint8
+	Sect  uint8
+	Desc  uint16
+	Value uint32
+}
+
+// An Nlist64 is a Mach-O 64-bit symbol table entry.
+type Nlist64 struct {
+	Name  uint32
+	Type  uint8
+	Sect  uint8
+	Desc  uint16
+	Value uint64
+}
+
+// Regs386 is the Mach-O 386 register structure.
+type Regs386 struct {
+	AX    uint32
+	BX    uint32
+	CX    uint32
+	DX    uint32
+	DI    uint32
+	SI    uint32
+	BP    uint32
+	SP    uint32
+	SS    uint32
+	FLAGS uint32
+	IP    uint32
+	CS    uint32
+	DS    uint32
+	ES    uint32
+	FS    uint32
+	GS    uint32
+}
+
+// RegsAMD64 is the Mach-O AMD64 register structure.
+type RegsAMD64 struct {
+	AX    uint64
+	BX    uint64
+	CX    uint64
+	DX    uint64
+	DI    uint64
+	SI    uint64
+	BP    uint64
+	SP    uint64
+	R8    uint64
+	R9    uint64
+	R10   uint64
+	R11   uint64
+	R12   uint64
+	R13   uint64
+	R14   uint64
+	R15   uint64
+	IP    uint64
+	FLAGS uint64
+	CS    uint64
+	FS    uint64
+	GS    uint64
+}
+
+type intName struct {
+	i uint32
+	s string
+}
+
+func stringName(i uint32, names []intName, goSyntax bool) string {
+	for _, n := range names {
+		if n.i == i {
+			if goSyntax {
+				return "macho." + n.s
+			}
+			return n.s
+		}
+	}
+	return strconv.FormatUint(uint64(i), 10)
+}
diff --git a/src/debug/macho/reloctype.go b/src/debug/macho/reloctype.go
new file mode 100644
index 0000000..496dfce
--- /dev/null
+++ b/src/debug/macho/reloctype.go
@@ -0,0 +1,72 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package macho
+
+//go:generate stringer -type=RelocTypeGeneric,RelocTypeX86_64,RelocTypeARM,RelocTypeARM64 -output reloctype_string.go
+
+type RelocTypeGeneric int
+
+const (
+	GENERIC_RELOC_VANILLA        RelocTypeGeneric = 0
+	GENERIC_RELOC_PAIR           RelocTypeGeneric = 1
+	GENERIC_RELOC_SECTDIFF       RelocTypeGeneric = 2
+	GENERIC_RELOC_PB_LA_PTR      RelocTypeGeneric = 3
+	GENERIC_RELOC_LOCAL_SECTDIFF RelocTypeGeneric = 4
+	GENERIC_RELOC_TLV            RelocTypeGeneric = 5
+)
+
+func (r RelocTypeGeneric) GoString() string { return "macho." + r.String() }
+
+type RelocTypeX86_64 int
+
+const (
+	X86_64_RELOC_UNSIGNED   RelocTypeX86_64 = 0
+	X86_64_RELOC_SIGNED     RelocTypeX86_64 = 1
+	X86_64_RELOC_BRANCH     RelocTypeX86_64 = 2
+	X86_64_RELOC_GOT_LOAD   RelocTypeX86_64 = 3
+	X86_64_RELOC_GOT        RelocTypeX86_64 = 4
+	X86_64_RELOC_SUBTRACTOR RelocTypeX86_64 = 5
+	X86_64_RELOC_SIGNED_1   RelocTypeX86_64 = 6
+	X86_64_RELOC_SIGNED_2   RelocTypeX86_64 = 7
+	X86_64_RELOC_SIGNED_4   RelocTypeX86_64 = 8
+	X86_64_RELOC_TLV        RelocTypeX86_64 = 9
+)
+
+func (r RelocTypeX86_64) GoString() string { return "macho." + r.String() }
+
+type RelocTypeARM int
+
+const (
+	ARM_RELOC_VANILLA        RelocTypeARM = 0
+	ARM_RELOC_PAIR           RelocTypeARM = 1
+	ARM_RELOC_SECTDIFF       RelocTypeARM = 2
+	ARM_RELOC_LOCAL_SECTDIFF RelocTypeARM = 3
+	ARM_RELOC_PB_LA_PTR      RelocTypeARM = 4
+	ARM_RELOC_BR24           RelocTypeARM = 5
+	ARM_THUMB_RELOC_BR22     RelocTypeARM = 6
+	ARM_THUMB_32BIT_BRANCH   RelocTypeARM = 7
+	ARM_RELOC_HALF           RelocTypeARM = 8
+	ARM_RELOC_HALF_SECTDIFF  RelocTypeARM = 9
+)
+
+func (r RelocTypeARM) GoString() string { return "macho." + r.String() }
+
+type RelocTypeARM64 int
+
+const (
+	ARM64_RELOC_UNSIGNED            RelocTypeARM64 = 0
+	ARM64_RELOC_SUBTRACTOR          RelocTypeARM64 = 1
+	ARM64_RELOC_BRANCH26            RelocTypeARM64 = 2
+	ARM64_RELOC_PAGE21              RelocTypeARM64 = 3
+	ARM64_RELOC_PAGEOFF12           RelocTypeARM64 = 4
+	ARM64_RELOC_GOT_LOAD_PAGE21     RelocTypeARM64 = 5
+	ARM64_RELOC_GOT_LOAD_PAGEOFF12  RelocTypeARM64 = 6
+	ARM64_RELOC_POINTER_TO_GOT      RelocTypeARM64 = 7
+	ARM64_RELOC_TLVP_LOAD_PAGE21    RelocTypeARM64 = 8
+	ARM64_RELOC_TLVP_LOAD_PAGEOFF12 RelocTypeARM64 = 9
+	ARM64_RELOC_ADDEND              RelocTypeARM64 = 10
+)
+
+func (r RelocTypeARM64) GoString() string { return "macho." + r.String() }
diff --git a/src/debug/macho/reloctype_string.go b/src/debug/macho/reloctype_string.go
new file mode 100644
index 0000000..9c2b131
--- /dev/null
+++ b/src/debug/macho/reloctype_string.go
@@ -0,0 +1,49 @@
+// Code generated by "stringer -type=RelocTypeGeneric,RelocTypeX86_64,RelocTypeARM,RelocTypeARM64 -output reloctype_string.go"; DO NOT EDIT.
+
+package macho
+
+import "strconv"
+
+const _RelocTypeGeneric_name = "GENERIC_RELOC_VANILLAGENERIC_RELOC_PAIRGENERIC_RELOC_SECTDIFFGENERIC_RELOC_PB_LA_PTRGENERIC_RELOC_LOCAL_SECTDIFFGENERIC_RELOC_TLV"
+
+var _RelocTypeGeneric_index = [...]uint8{0, 21, 39, 61, 84, 112, 129}
+
+func (i RelocTypeGeneric) String() string {
+	if i < 0 || i >= RelocTypeGeneric(len(_RelocTypeGeneric_index)-1) {
+		return "RelocTypeGeneric(" + strconv.FormatInt(int64(i), 10) + ")"
+	}
+	return _RelocTypeGeneric_name[_RelocTypeGeneric_index[i]:_RelocTypeGeneric_index[i+1]]
+}
+
+const _RelocTypeX86_64_name = "X86_64_RELOC_UNSIGNEDX86_64_RELOC_SIGNEDX86_64_RELOC_BRANCHX86_64_RELOC_GOT_LOADX86_64_RELOC_GOTX86_64_RELOC_SUBTRACTORX86_64_RELOC_SIGNED_1X86_64_RELOC_SIGNED_2X86_64_RELOC_SIGNED_4X86_64_RELOC_TLV"
+
+var _RelocTypeX86_64_index = [...]uint8{0, 21, 40, 59, 80, 96, 119, 140, 161, 182, 198}
+
+func (i RelocTypeX86_64) String() string {
+	if i < 0 || i >= RelocTypeX86_64(len(_RelocTypeX86_64_index)-1) {
+		return "RelocTypeX86_64(" + strconv.FormatInt(int64(i), 10) + ")"
+	}
+	return _RelocTypeX86_64_name[_RelocTypeX86_64_index[i]:_RelocTypeX86_64_index[i+1]]
+}
+
+const _RelocTypeARM_name = "ARM_RELOC_VANILLAARM_RELOC_PAIRARM_RELOC_SECTDIFFARM_RELOC_LOCAL_SECTDIFFARM_RELOC_PB_LA_PTRARM_RELOC_BR24ARM_THUMB_RELOC_BR22ARM_THUMB_32BIT_BRANCHARM_RELOC_HALFARM_RELOC_HALF_SECTDIFF"
+
+var _RelocTypeARM_index = [...]uint8{0, 17, 31, 49, 73, 92, 106, 126, 148, 162, 185}
+
+func (i RelocTypeARM) String() string {
+	if i < 0 || i >= RelocTypeARM(len(_RelocTypeARM_index)-1) {
+		return "RelocTypeARM(" + strconv.FormatInt(int64(i), 10) + ")"
+	}
+	return _RelocTypeARM_name[_RelocTypeARM_index[i]:_RelocTypeARM_index[i+1]]
+}
+
+const _RelocTypeARM64_name = "ARM64_RELOC_UNSIGNEDARM64_RELOC_SUBTRACTORARM64_RELOC_BRANCH26ARM64_RELOC_PAGE21ARM64_RELOC_PAGEOFF12ARM64_RELOC_GOT_LOAD_PAGE21ARM64_RELOC_GOT_LOAD_PAGEOFF12ARM64_RELOC_POINTER_TO_GOTARM64_RELOC_TLVP_LOAD_PAGE21ARM64_RELOC_TLVP_LOAD_PAGEOFF12ARM64_RELOC_ADDEND"
+
+var _RelocTypeARM64_index = [...]uint16{0, 20, 42, 62, 80, 101, 128, 158, 184, 212, 243, 261}
+
+func (i RelocTypeARM64) String() string {
+	if i < 0 || i >= RelocTypeARM64(len(_RelocTypeARM64_index)-1) {
+		return "RelocTypeARM64(" + strconv.FormatInt(int64(i), 10) + ")"
+	}
+	return _RelocTypeARM64_name[_RelocTypeARM64_index[i]:_RelocTypeARM64_index[i+1]]
+}
diff --git a/src/debug/macho/testdata/clang-386-darwin-exec-with-rpath.base64 b/src/debug/macho/testdata/clang-386-darwin-exec-with-rpath.base64
new file mode 100644
index 0000000..64047f1
--- /dev/null
+++ b/src/debug/macho/testdata/clang-386-darwin-exec-with-rpath.base64
@@ -0,0 +1 @@
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diff --git a/src/debug/macho/testdata/clang-386-darwin.obj.base64 b/src/debug/macho/testdata/clang-386-darwin.obj.base64
new file mode 100644
index 0000000..60a0765
--- /dev/null
+++ b/src/debug/macho/testdata/clang-386-darwin.obj.base64
@@ -0,0 +1 @@
+zvrt/gcAAAADAAAAAQAAAAQAAAA4AQAAACAAAAEAAADAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA7AAAAVAEAADsAAAAHAAAABwAAAAIAAAAAAAAAX190ZXh0AAAAAAAAAAAAAF9fVEVYVAAAAAAAAAAAAAAAAAAALQAAAFQBAAAEAAAAkAEAAAMAAAAABACAAAAAAAAAAABfX2NzdHJpbmcAAAAAAAAAX19URVhUAAAAAAAAAAAAAC0AAAAOAAAAgQEAAAAAAAAAAAAAAAAAAAIAAAAAAAAAAAAAACQAAAAQAAAAAAwKAAAAAAACAAAAGAAAAKgBAAACAAAAwAEAABAAAAALAAAAUAAAAAAAAAAAAAAAAAAAAAEAAAABAAAAAQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAFWJ5YPsGOgAAAAAWI2AIgAAAMdF/AAAAACJBCTo3////zHJiUX4iciDxBhdw2hlbGxvLCB3b3JsZAoAAB0AAAABAAANDgAApC0AAAAAAAChCwAAAAEAAAAPAQAAAAAAAAcAAAABAAAAAAAAAABfbWFpbgBfcHJpbnRmAAA=
diff --git a/src/debug/macho/testdata/clang-amd64-darwin-exec-with-rpath.base64 b/src/debug/macho/testdata/clang-amd64-darwin-exec-with-rpath.base64
new file mode 100644
index 0000000..2682181
--- /dev/null
+++ b/src/debug/macho/testdata/clang-amd64-darwin-exec-with-rpath.base64
@@ -0,0 +1 @@
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diff --git a/src/debug/macho/testdata/clang-amd64-darwin.obj.base64 b/src/debug/macho/testdata/clang-amd64-darwin.obj.base64
new file mode 100644
index 0000000..b8f1fce
--- /dev/null
+++ b/src/debug/macho/testdata/clang-amd64-darwin.obj.base64
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diff --git a/src/debug/macho/testdata/fat-gcc-386-amd64-darwin-exec.base64 b/src/debug/macho/testdata/fat-gcc-386-amd64-darwin-exec.base64
new file mode 100644
index 0000000..407d977
--- /dev/null
+++ b/src/debug/macho/testdata/fat-gcc-386-amd64-darwin-exec.base64
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diff --git a/src/debug/macho/testdata/gcc-386-darwin-exec.base64 b/src/debug/macho/testdata/gcc-386-darwin-exec.base64
new file mode 100644
index 0000000..5e40ed6
--- /dev/null
+++ b/src/debug/macho/testdata/gcc-386-darwin-exec.base64
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diff --git a/src/debug/macho/testdata/gcc-amd64-darwin-exec-debug.base64 b/src/debug/macho/testdata/gcc-amd64-darwin-exec-debug.base64
new file mode 100644
index 0000000..8884566
--- /dev/null
+++ b/src/debug/macho/testdata/gcc-amd64-darwin-exec-debug.base64
@@ -0,0 +1 @@
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diff --git a/src/debug/macho/testdata/gcc-amd64-darwin-exec-with-bad-dysym.base64 b/src/debug/macho/testdata/gcc-amd64-darwin-exec-with-bad-dysym.base64
new file mode 100644
index 0000000..8e04366
--- /dev/null
+++ b/src/debug/macho/testdata/gcc-amd64-darwin-exec-with-bad-dysym.base64
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/src/debug/macho/testdata/gcc-amd64-darwin-exec.base64 b/src/debug/macho/testdata/gcc-amd64-darwin-exec.base64
new file mode 100644
index 0000000..b48ae56
--- /dev/null
+++ b/src/debug/macho/testdata/gcc-amd64-darwin-exec.base64
@@ -0,0 +1 @@
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diff --git a/src/debug/macho/testdata/hello.c b/src/debug/macho/testdata/hello.c
new file mode 100644
index 0000000..a689d36
--- /dev/null
+++ b/src/debug/macho/testdata/hello.c
@@ -0,0 +1,8 @@
+#include <stdio.h>
+
+int
+main(void)
+{
+	printf("hello, world\n");
+	return 0;
+}
diff --git a/src/debug/pe/file.go b/src/debug/pe/file.go
new file mode 100644
index 0000000..ab00a48
--- /dev/null
+++ b/src/debug/pe/file.go
@@ -0,0 +1,614 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package pe implements access to PE (Microsoft Windows Portable Executable) files.
+package pe
+
+import (
+	"bytes"
+	"compress/zlib"
+	"debug/dwarf"
+	"encoding/binary"
+	"fmt"
+	"io"
+	"os"
+	"strings"
+)
+
+// Avoid use of post-Go 1.4 io features, to make safe for toolchain bootstrap.
+const seekStart = 0
+
+// A File represents an open PE file.
+type File struct {
+	FileHeader
+	OptionalHeader interface{} // of type *OptionalHeader32 or *OptionalHeader64
+	Sections       []*Section
+	Symbols        []*Symbol    // COFF symbols with auxiliary symbol records removed
+	COFFSymbols    []COFFSymbol // all COFF symbols (including auxiliary symbol records)
+	StringTable    StringTable
+
+	closer io.Closer
+}
+
+// Open opens the named file using os.Open and prepares it for use as a PE binary.
+func Open(name string) (*File, error) {
+	f, err := os.Open(name)
+	if err != nil {
+		return nil, err
+	}
+	ff, err := NewFile(f)
+	if err != nil {
+		f.Close()
+		return nil, err
+	}
+	ff.closer = f
+	return ff, nil
+}
+
+// Close closes the File.
+// If the File was created using NewFile directly instead of Open,
+// Close has no effect.
+func (f *File) Close() error {
+	var err error
+	if f.closer != nil {
+		err = f.closer.Close()
+		f.closer = nil
+	}
+	return err
+}
+
+// TODO(brainman): add Load function, as a replacement for NewFile, that does not call removeAuxSymbols (for performance)
+
+// NewFile creates a new File for accessing a PE binary in an underlying reader.
+func NewFile(r io.ReaderAt) (*File, error) {
+	f := new(File)
+	sr := io.NewSectionReader(r, 0, 1<<63-1)
+
+	var dosheader [96]byte
+	if _, err := r.ReadAt(dosheader[0:], 0); err != nil {
+		return nil, err
+	}
+	var base int64
+	if dosheader[0] == 'M' && dosheader[1] == 'Z' {
+		signoff := int64(binary.LittleEndian.Uint32(dosheader[0x3c:]))
+		var sign [4]byte
+		r.ReadAt(sign[:], signoff)
+		if !(sign[0] == 'P' && sign[1] == 'E' && sign[2] == 0 && sign[3] == 0) {
+			return nil, fmt.Errorf("invalid PE file signature: % x", sign)
+		}
+		base = signoff + 4
+	} else {
+		base = int64(0)
+	}
+	sr.Seek(base, seekStart)
+	if err := binary.Read(sr, binary.LittleEndian, &f.FileHeader); err != nil {
+		return nil, err
+	}
+	switch f.FileHeader.Machine {
+	case IMAGE_FILE_MACHINE_AMD64,
+		IMAGE_FILE_MACHINE_ARM64,
+		IMAGE_FILE_MACHINE_ARMNT,
+		IMAGE_FILE_MACHINE_I386,
+		IMAGE_FILE_MACHINE_UNKNOWN:
+		// ok
+	default:
+		return nil, fmt.Errorf("unrecognized PE machine: %#x", f.FileHeader.Machine)
+	}
+
+	var err error
+
+	// Read string table.
+	f.StringTable, err = readStringTable(&f.FileHeader, sr)
+	if err != nil {
+		return nil, err
+	}
+
+	// Read symbol table.
+	f.COFFSymbols, err = readCOFFSymbols(&f.FileHeader, sr)
+	if err != nil {
+		return nil, err
+	}
+	f.Symbols, err = removeAuxSymbols(f.COFFSymbols, f.StringTable)
+	if err != nil {
+		return nil, err
+	}
+
+	// Seek past file header.
+	_, err = sr.Seek(base+int64(binary.Size(f.FileHeader)), seekStart)
+	if err != nil {
+		return nil, err
+	}
+
+	// Read optional header.
+	f.OptionalHeader, err = readOptionalHeader(sr, f.FileHeader.SizeOfOptionalHeader)
+	if err != nil {
+		return nil, err
+	}
+
+	// Process sections.
+	f.Sections = make([]*Section, f.FileHeader.NumberOfSections)
+	for i := 0; i < int(f.FileHeader.NumberOfSections); i++ {
+		sh := new(SectionHeader32)
+		if err := binary.Read(sr, binary.LittleEndian, sh); err != nil {
+			return nil, err
+		}
+		name, err := sh.fullName(f.StringTable)
+		if err != nil {
+			return nil, err
+		}
+		s := new(Section)
+		s.SectionHeader = SectionHeader{
+			Name:                 name,
+			VirtualSize:          sh.VirtualSize,
+			VirtualAddress:       sh.VirtualAddress,
+			Size:                 sh.SizeOfRawData,
+			Offset:               sh.PointerToRawData,
+			PointerToRelocations: sh.PointerToRelocations,
+			PointerToLineNumbers: sh.PointerToLineNumbers,
+			NumberOfRelocations:  sh.NumberOfRelocations,
+			NumberOfLineNumbers:  sh.NumberOfLineNumbers,
+			Characteristics:      sh.Characteristics,
+		}
+		r2 := r
+		if sh.PointerToRawData == 0 { // .bss must have all 0s
+			r2 = zeroReaderAt{}
+		}
+		s.sr = io.NewSectionReader(r2, int64(s.SectionHeader.Offset), int64(s.SectionHeader.Size))
+		s.ReaderAt = s.sr
+		f.Sections[i] = s
+	}
+	for i := range f.Sections {
+		var err error
+		f.Sections[i].Relocs, err = readRelocs(&f.Sections[i].SectionHeader, sr)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	return f, nil
+}
+
+// zeroReaderAt is ReaderAt that reads 0s.
+type zeroReaderAt struct{}
+
+// ReadAt writes len(p) 0s into p.
+func (w zeroReaderAt) ReadAt(p []byte, off int64) (n int, err error) {
+	for i := range p {
+		p[i] = 0
+	}
+	return len(p), nil
+}
+
+// getString extracts a string from symbol string table.
+func getString(section []byte, start int) (string, bool) {
+	if start < 0 || start >= len(section) {
+		return "", false
+	}
+
+	for end := start; end < len(section); end++ {
+		if section[end] == 0 {
+			return string(section[start:end]), true
+		}
+	}
+	return "", false
+}
+
+// Section returns the first section with the given name, or nil if no such
+// section exists.
+func (f *File) Section(name string) *Section {
+	for _, s := range f.Sections {
+		if s.Name == name {
+			return s
+		}
+	}
+	return nil
+}
+
+func (f *File) DWARF() (*dwarf.Data, error) {
+	dwarfSuffix := func(s *Section) string {
+		switch {
+		case strings.HasPrefix(s.Name, ".debug_"):
+			return s.Name[7:]
+		case strings.HasPrefix(s.Name, ".zdebug_"):
+			return s.Name[8:]
+		default:
+			return ""
+		}
+
+	}
+
+	// sectionData gets the data for s and checks its size.
+	sectionData := func(s *Section) ([]byte, error) {
+		b, err := s.Data()
+		if err != nil && uint32(len(b)) < s.Size {
+			return nil, err
+		}
+
+		if 0 < s.VirtualSize && s.VirtualSize < s.Size {
+			b = b[:s.VirtualSize]
+		}
+
+		if len(b) >= 12 && string(b[:4]) == "ZLIB" {
+			dlen := binary.BigEndian.Uint64(b[4:12])
+			dbuf := make([]byte, dlen)
+			r, err := zlib.NewReader(bytes.NewBuffer(b[12:]))
+			if err != nil {
+				return nil, err
+			}
+			if _, err := io.ReadFull(r, dbuf); err != nil {
+				return nil, err
+			}
+			if err := r.Close(); err != nil {
+				return nil, err
+			}
+			b = dbuf
+		}
+		return b, nil
+	}
+
+	// There are many other DWARF sections, but these
+	// are the ones the debug/dwarf package uses.
+	// Don't bother loading others.
+	var dat = map[string][]byte{"abbrev": nil, "info": nil, "str": nil, "line": nil, "ranges": nil}
+	for _, s := range f.Sections {
+		suffix := dwarfSuffix(s)
+		if suffix == "" {
+			continue
+		}
+		if _, ok := dat[suffix]; !ok {
+			continue
+		}
+
+		b, err := sectionData(s)
+		if err != nil {
+			return nil, err
+		}
+		dat[suffix] = b
+	}
+
+	d, err := dwarf.New(dat["abbrev"], nil, nil, dat["info"], dat["line"], nil, dat["ranges"], dat["str"])
+	if err != nil {
+		return nil, err
+	}
+
+	// Look for DWARF4 .debug_types sections and DWARF5 sections.
+	for i, s := range f.Sections {
+		suffix := dwarfSuffix(s)
+		if suffix == "" {
+			continue
+		}
+		if _, ok := dat[suffix]; ok {
+			// Already handled.
+			continue
+		}
+
+		b, err := sectionData(s)
+		if err != nil {
+			return nil, err
+		}
+
+		if suffix == "types" {
+			err = d.AddTypes(fmt.Sprintf("types-%d", i), b)
+		} else {
+			err = d.AddSection(".debug_"+suffix, b)
+		}
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	return d, nil
+}
+
+// TODO(brainman): document ImportDirectory once we decide what to do with it.
+
+type ImportDirectory struct {
+	OriginalFirstThunk uint32
+	TimeDateStamp      uint32
+	ForwarderChain     uint32
+	Name               uint32
+	FirstThunk         uint32
+
+	dll string
+}
+
+// ImportedSymbols returns the names of all symbols
+// referred to by the binary f that are expected to be
+// satisfied by other libraries at dynamic load time.
+// It does not return weak symbols.
+func (f *File) ImportedSymbols() ([]string, error) {
+	if f.OptionalHeader == nil {
+		return nil, nil
+	}
+
+	pe64 := f.Machine == IMAGE_FILE_MACHINE_AMD64 || f.Machine == IMAGE_FILE_MACHINE_ARM64
+
+	// grab the number of data directory entries
+	var dd_length uint32
+	if pe64 {
+		dd_length = f.OptionalHeader.(*OptionalHeader64).NumberOfRvaAndSizes
+	} else {
+		dd_length = f.OptionalHeader.(*OptionalHeader32).NumberOfRvaAndSizes
+	}
+
+	// check that the length of data directory entries is large
+	// enough to include the imports directory.
+	if dd_length < IMAGE_DIRECTORY_ENTRY_IMPORT+1 {
+		return nil, nil
+	}
+
+	// grab the import data directory entry
+	var idd DataDirectory
+	if pe64 {
+		idd = f.OptionalHeader.(*OptionalHeader64).DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT]
+	} else {
+		idd = f.OptionalHeader.(*OptionalHeader32).DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT]
+	}
+
+	// figure out which section contains the import directory table
+	var ds *Section
+	ds = nil
+	for _, s := range f.Sections {
+		if s.VirtualAddress <= idd.VirtualAddress && idd.VirtualAddress < s.VirtualAddress+s.VirtualSize {
+			ds = s
+			break
+		}
+	}
+
+	// didn't find a section, so no import libraries were found
+	if ds == nil {
+		return nil, nil
+	}
+
+	d, err := ds.Data()
+	if err != nil {
+		return nil, err
+	}
+
+	// seek to the virtual address specified in the import data directory
+	d = d[idd.VirtualAddress-ds.VirtualAddress:]
+
+	// start decoding the import directory
+	var ida []ImportDirectory
+	for len(d) >= 20 {
+		var dt ImportDirectory
+		dt.OriginalFirstThunk = binary.LittleEndian.Uint32(d[0:4])
+		dt.TimeDateStamp = binary.LittleEndian.Uint32(d[4:8])
+		dt.ForwarderChain = binary.LittleEndian.Uint32(d[8:12])
+		dt.Name = binary.LittleEndian.Uint32(d[12:16])
+		dt.FirstThunk = binary.LittleEndian.Uint32(d[16:20])
+		d = d[20:]
+		if dt.OriginalFirstThunk == 0 {
+			break
+		}
+		ida = append(ida, dt)
+	}
+	// TODO(brainman): this needs to be rewritten
+	//  ds.Data() returns contents of section containing import table. Why store in variable called "names"?
+	//  Why we are retrieving it second time? We already have it in "d", and it is not modified anywhere.
+	//  getString does not extracts a string from symbol string table (as getString doco says).
+	//  Why ds.Data() called again and again in the loop?
+	//  Needs test before rewrite.
+	names, _ := ds.Data()
+	var all []string
+	for _, dt := range ida {
+		dt.dll, _ = getString(names, int(dt.Name-ds.VirtualAddress))
+		d, _ = ds.Data()
+		// seek to OriginalFirstThunk
+		d = d[dt.OriginalFirstThunk-ds.VirtualAddress:]
+		for len(d) > 0 {
+			if pe64 { // 64bit
+				va := binary.LittleEndian.Uint64(d[0:8])
+				d = d[8:]
+				if va == 0 {
+					break
+				}
+				if va&0x8000000000000000 > 0 { // is Ordinal
+					// TODO add dynimport ordinal support.
+				} else {
+					fn, _ := getString(names, int(uint32(va)-ds.VirtualAddress+2))
+					all = append(all, fn+":"+dt.dll)
+				}
+			} else { // 32bit
+				va := binary.LittleEndian.Uint32(d[0:4])
+				d = d[4:]
+				if va == 0 {
+					break
+				}
+				if va&0x80000000 > 0 { // is Ordinal
+					// TODO add dynimport ordinal support.
+					//ord := va&0x0000FFFF
+				} else {
+					fn, _ := getString(names, int(va-ds.VirtualAddress+2))
+					all = append(all, fn+":"+dt.dll)
+				}
+			}
+		}
+	}
+
+	return all, nil
+}
+
+// ImportedLibraries returns the names of all libraries
+// referred to by the binary f that are expected to be
+// linked with the binary at dynamic link time.
+func (f *File) ImportedLibraries() ([]string, error) {
+	// TODO
+	// cgo -dynimport don't use this for windows PE, so just return.
+	return nil, nil
+}
+
+// FormatError is unused.
+// The type is retained for compatibility.
+type FormatError struct {
+}
+
+func (e *FormatError) Error() string {
+	return "unknown error"
+}
+
+// readOptionalHeader accepts a io.ReadSeeker pointing to optional header in the PE file
+// and its size as seen in the file header.
+// It parses the given size of bytes and returns optional header. It infers whether the
+// bytes being parsed refer to 32 bit or 64 bit version of optional header.
+func readOptionalHeader(r io.ReadSeeker, sz uint16) (interface{}, error) {
+	// If optional header size is 0, return empty optional header.
+	if sz == 0 {
+		return nil, nil
+	}
+
+	var (
+		// First couple of bytes in option header state its type.
+		// We need to read them first to determine the type and
+		// validity of optional header.
+		ohMagic   uint16
+		ohMagicSz = binary.Size(ohMagic)
+	)
+
+	// If optional header size is greater than 0 but less than its magic size, return error.
+	if sz < uint16(ohMagicSz) {
+		return nil, fmt.Errorf("optional header size is less than optional header magic size")
+	}
+
+	// read reads from io.ReadSeeke, r, into data.
+	var err error
+	read := func(data interface{}) bool {
+		err = binary.Read(r, binary.LittleEndian, data)
+		return err == nil
+	}
+
+	if !read(&ohMagic) {
+		return nil, fmt.Errorf("failure to read optional header magic: %v", err)
+
+	}
+
+	switch ohMagic {
+	case 0x10b: // PE32
+		var (
+			oh32 OptionalHeader32
+			// There can be 0 or more data directories. So the minimum size of optional
+			// header is calculated by subtracting oh32.DataDirectory size from oh32 size.
+			oh32MinSz = binary.Size(oh32) - binary.Size(oh32.DataDirectory)
+		)
+
+		if sz < uint16(oh32MinSz) {
+			return nil, fmt.Errorf("optional header size(%d) is less minimum size (%d) of PE32 optional header", sz, oh32MinSz)
+		}
+
+		// Init oh32 fields
+		oh32.Magic = ohMagic
+		if !read(&oh32.MajorLinkerVersion) ||
+			!read(&oh32.MinorLinkerVersion) ||
+			!read(&oh32.SizeOfCode) ||
+			!read(&oh32.SizeOfInitializedData) ||
+			!read(&oh32.SizeOfUninitializedData) ||
+			!read(&oh32.AddressOfEntryPoint) ||
+			!read(&oh32.BaseOfCode) ||
+			!read(&oh32.BaseOfData) ||
+			!read(&oh32.ImageBase) ||
+			!read(&oh32.SectionAlignment) ||
+			!read(&oh32.FileAlignment) ||
+			!read(&oh32.MajorOperatingSystemVersion) ||
+			!read(&oh32.MinorOperatingSystemVersion) ||
+			!read(&oh32.MajorImageVersion) ||
+			!read(&oh32.MinorImageVersion) ||
+			!read(&oh32.MajorSubsystemVersion) ||
+			!read(&oh32.MinorSubsystemVersion) ||
+			!read(&oh32.Win32VersionValue) ||
+			!read(&oh32.SizeOfImage) ||
+			!read(&oh32.SizeOfHeaders) ||
+			!read(&oh32.CheckSum) ||
+			!read(&oh32.Subsystem) ||
+			!read(&oh32.DllCharacteristics) ||
+			!read(&oh32.SizeOfStackReserve) ||
+			!read(&oh32.SizeOfStackCommit) ||
+			!read(&oh32.SizeOfHeapReserve) ||
+			!read(&oh32.SizeOfHeapCommit) ||
+			!read(&oh32.LoaderFlags) ||
+			!read(&oh32.NumberOfRvaAndSizes) {
+			return nil, fmt.Errorf("failure to read PE32 optional header: %v", err)
+		}
+
+		dd, err := readDataDirectories(r, sz-uint16(oh32MinSz), oh32.NumberOfRvaAndSizes)
+		if err != nil {
+			return nil, err
+		}
+
+		copy(oh32.DataDirectory[:], dd)
+
+		return &oh32, nil
+	case 0x20b: // PE32+
+		var (
+			oh64 OptionalHeader64
+			// There can be 0 or more data directories. So the minimum size of optional
+			// header is calculated by subtracting oh64.DataDirectory size from oh64 size.
+			oh64MinSz = binary.Size(oh64) - binary.Size(oh64.DataDirectory)
+		)
+
+		if sz < uint16(oh64MinSz) {
+			return nil, fmt.Errorf("optional header size(%d) is less minimum size (%d) for PE32+ optional header", sz, oh64MinSz)
+		}
+
+		// Init oh64 fields
+		oh64.Magic = ohMagic
+		if !read(&oh64.MajorLinkerVersion) ||
+			!read(&oh64.MinorLinkerVersion) ||
+			!read(&oh64.SizeOfCode) ||
+			!read(&oh64.SizeOfInitializedData) ||
+			!read(&oh64.SizeOfUninitializedData) ||
+			!read(&oh64.AddressOfEntryPoint) ||
+			!read(&oh64.BaseOfCode) ||
+			!read(&oh64.ImageBase) ||
+			!read(&oh64.SectionAlignment) ||
+			!read(&oh64.FileAlignment) ||
+			!read(&oh64.MajorOperatingSystemVersion) ||
+			!read(&oh64.MinorOperatingSystemVersion) ||
+			!read(&oh64.MajorImageVersion) ||
+			!read(&oh64.MinorImageVersion) ||
+			!read(&oh64.MajorSubsystemVersion) ||
+			!read(&oh64.MinorSubsystemVersion) ||
+			!read(&oh64.Win32VersionValue) ||
+			!read(&oh64.SizeOfImage) ||
+			!read(&oh64.SizeOfHeaders) ||
+			!read(&oh64.CheckSum) ||
+			!read(&oh64.Subsystem) ||
+			!read(&oh64.DllCharacteristics) ||
+			!read(&oh64.SizeOfStackReserve) ||
+			!read(&oh64.SizeOfStackCommit) ||
+			!read(&oh64.SizeOfHeapReserve) ||
+			!read(&oh64.SizeOfHeapCommit) ||
+			!read(&oh64.LoaderFlags) ||
+			!read(&oh64.NumberOfRvaAndSizes) {
+			return nil, fmt.Errorf("failure to read PE32+ optional header: %v", err)
+		}
+
+		dd, err := readDataDirectories(r, sz-uint16(oh64MinSz), oh64.NumberOfRvaAndSizes)
+		if err != nil {
+			return nil, err
+		}
+
+		copy(oh64.DataDirectory[:], dd)
+
+		return &oh64, nil
+	default:
+		return nil, fmt.Errorf("optional header has unexpected Magic of 0x%x", ohMagic)
+	}
+}
+
+// readDataDirectories accepts a io.ReadSeeker pointing to data directories in the PE file,
+// its size and number of data directories as seen in optional header.
+// It parses the given size of bytes and returns given number of data directories.
+func readDataDirectories(r io.ReadSeeker, sz uint16, n uint32) ([]DataDirectory, error) {
+	ddSz := binary.Size(DataDirectory{})
+	if uint32(sz) != n*uint32(ddSz) {
+		return nil, fmt.Errorf("size of data directories(%d) is inconsistent with number of data directories(%d)", sz, n)
+	}
+
+	dd := make([]DataDirectory, n)
+	if err := binary.Read(r, binary.LittleEndian, dd); err != nil {
+		return nil, fmt.Errorf("failure to read data directories: %v", err)
+	}
+
+	return dd, nil
+}
diff --git a/src/debug/pe/file_cgo_test.go b/src/debug/pe/file_cgo_test.go
new file mode 100644
index 0000000..13eb4e6
--- /dev/null
+++ b/src/debug/pe/file_cgo_test.go
@@ -0,0 +1,36 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build cgo
+// +build cgo
+
+package pe
+
+import (
+	"os/exec"
+	"runtime"
+	"testing"
+)
+
+func testCgoDWARF(t *testing.T, linktype int) {
+	if _, err := exec.LookPath("gcc"); err != nil {
+		t.Skip("skipping test: gcc is missing")
+	}
+	testDWARF(t, linktype)
+}
+
+func TestDefaultLinkerDWARF(t *testing.T) {
+	testCgoDWARF(t, linkCgoDefault)
+}
+
+func TestInternalLinkerDWARF(t *testing.T) {
+	if runtime.GOARCH == "arm64" {
+		t.Skip("internal linker disabled on windows/arm64")
+	}
+	testCgoDWARF(t, linkCgoInternal)
+}
+
+func TestExternalLinkerDWARF(t *testing.T) {
+	testCgoDWARF(t, linkCgoExternal)
+}
diff --git a/src/debug/pe/file_test.go b/src/debug/pe/file_test.go
new file mode 100644
index 0000000..8964b4f
--- /dev/null
+++ b/src/debug/pe/file_test.go
@@ -0,0 +1,745 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package pe
+
+import (
+	"bytes"
+	"debug/dwarf"
+	"internal/testenv"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"reflect"
+	"regexp"
+	"runtime"
+	"strconv"
+	"testing"
+	"text/template"
+)
+
+type fileTest struct {
+	file           string
+	hdr            FileHeader
+	opthdr         interface{}
+	sections       []*SectionHeader
+	symbols        []*Symbol
+	hasNoDwarfInfo bool
+}
+
+var fileTests = []fileTest{
+	{
+		file: "testdata/gcc-386-mingw-obj",
+		hdr:  FileHeader{0x014c, 0x000c, 0x0, 0x64a, 0x1e, 0x0, 0x104},
+		sections: []*SectionHeader{
+			{".text", 0, 0, 36, 500, 1440, 0, 3, 0, 0x60300020},
+			{".data", 0, 0, 0, 0, 0, 0, 0, 0, 3224371264},
+			{".bss", 0, 0, 0, 0, 0, 0, 0, 0, 3224371328},
+			{".debug_abbrev", 0, 0, 137, 536, 0, 0, 0, 0, 0x42100000},
+			{".debug_info", 0, 0, 418, 673, 1470, 0, 7, 0, 1108344832},
+			{".debug_line", 0, 0, 128, 1091, 1540, 0, 1, 0, 1108344832},
+			{".rdata", 0, 0, 16, 1219, 0, 0, 0, 0, 1076887616},
+			{".debug_frame", 0, 0, 52, 1235, 1550, 0, 2, 0, 1110441984},
+			{".debug_loc", 0, 0, 56, 1287, 0, 0, 0, 0, 1108344832},
+			{".debug_pubnames", 0, 0, 27, 1343, 1570, 0, 1, 0, 1108344832},
+			{".debug_pubtypes", 0, 0, 38, 1370, 1580, 0, 1, 0, 1108344832},
+			{".debug_aranges", 0, 0, 32, 1408, 1590, 0, 2, 0, 1108344832},
+		},
+		symbols: []*Symbol{
+			{".file", 0x0, -2, 0x0, 0x67},
+			{"_main", 0x0, 1, 0x20, 0x2},
+			{".text", 0x0, 1, 0x0, 0x3},
+			{".data", 0x0, 2, 0x0, 0x3},
+			{".bss", 0x0, 3, 0x0, 0x3},
+			{".debug_abbrev", 0x0, 4, 0x0, 0x3},
+			{".debug_info", 0x0, 5, 0x0, 0x3},
+			{".debug_line", 0x0, 6, 0x0, 0x3},
+			{".rdata", 0x0, 7, 0x0, 0x3},
+			{".debug_frame", 0x0, 8, 0x0, 0x3},
+			{".debug_loc", 0x0, 9, 0x0, 0x3},
+			{".debug_pubnames", 0x0, 10, 0x0, 0x3},
+			{".debug_pubtypes", 0x0, 11, 0x0, 0x3},
+			{".debug_aranges", 0x0, 12, 0x0, 0x3},
+			{"___main", 0x0, 0, 0x20, 0x2},
+			{"_puts", 0x0, 0, 0x20, 0x2},
+		},
+	},
+	{
+		file: "testdata/gcc-386-mingw-exec",
+		hdr:  FileHeader{0x014c, 0x000f, 0x4c6a1b60, 0x3c00, 0x282, 0xe0, 0x107},
+		opthdr: &OptionalHeader32{
+			0x10b, 0x2, 0x38, 0xe00, 0x1a00, 0x200, 0x1160, 0x1000, 0x2000, 0x400000, 0x1000, 0x200, 0x4, 0x0, 0x1, 0x0, 0x4, 0x0, 0x0, 0x10000, 0x400, 0x14abb, 0x3, 0x0, 0x200000, 0x1000, 0x100000, 0x1000, 0x0, 0x10,
+			[16]DataDirectory{
+				{0x0, 0x0},
+				{0x5000, 0x3c8},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x7000, 0x18},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+			},
+		},
+		sections: []*SectionHeader{
+			{".text", 0xcd8, 0x1000, 0xe00, 0x400, 0x0, 0x0, 0x0, 0x0, 0x60500060},
+			{".data", 0x10, 0x2000, 0x200, 0x1200, 0x0, 0x0, 0x0, 0x0, 0xc0300040},
+			{".rdata", 0x120, 0x3000, 0x200, 0x1400, 0x0, 0x0, 0x0, 0x0, 0x40300040},
+			{".bss", 0xdc, 0x4000, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xc0400080},
+			{".idata", 0x3c8, 0x5000, 0x400, 0x1600, 0x0, 0x0, 0x0, 0x0, 0xc0300040},
+			{".CRT", 0x18, 0x6000, 0x200, 0x1a00, 0x0, 0x0, 0x0, 0x0, 0xc0300040},
+			{".tls", 0x20, 0x7000, 0x200, 0x1c00, 0x0, 0x0, 0x0, 0x0, 0xc0300040},
+			{".debug_aranges", 0x20, 0x8000, 0x200, 0x1e00, 0x0, 0x0, 0x0, 0x0, 0x42100000},
+			{".debug_pubnames", 0x51, 0x9000, 0x200, 0x2000, 0x0, 0x0, 0x0, 0x0, 0x42100000},
+			{".debug_pubtypes", 0x91, 0xa000, 0x200, 0x2200, 0x0, 0x0, 0x0, 0x0, 0x42100000},
+			{".debug_info", 0xe22, 0xb000, 0x1000, 0x2400, 0x0, 0x0, 0x0, 0x0, 0x42100000},
+			{".debug_abbrev", 0x157, 0xc000, 0x200, 0x3400, 0x0, 0x0, 0x0, 0x0, 0x42100000},
+			{".debug_line", 0x144, 0xd000, 0x200, 0x3600, 0x0, 0x0, 0x0, 0x0, 0x42100000},
+			{".debug_frame", 0x34, 0xe000, 0x200, 0x3800, 0x0, 0x0, 0x0, 0x0, 0x42300000},
+			{".debug_loc", 0x38, 0xf000, 0x200, 0x3a00, 0x0, 0x0, 0x0, 0x0, 0x42100000},
+		},
+	},
+	{
+		file: "testdata/gcc-386-mingw-no-symbols-exec",
+		hdr:  FileHeader{0x14c, 0x8, 0x69676572, 0x0, 0x0, 0xe0, 0x30f},
+		opthdr: &OptionalHeader32{0x10b, 0x2, 0x18, 0xe00, 0x1e00, 0x200, 0x1280, 0x1000, 0x2000, 0x400000, 0x1000, 0x200, 0x4, 0x0, 0x1, 0x0, 0x4, 0x0, 0x0, 0x9000, 0x400, 0x5306, 0x3, 0x0, 0x200000, 0x1000, 0x100000, 0x1000, 0x0, 0x10,
+			[16]DataDirectory{
+				{0x0, 0x0},
+				{0x6000, 0x378},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x8004, 0x18},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x60b8, 0x7c},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+			},
+		},
+		sections: []*SectionHeader{
+			{".text", 0xc64, 0x1000, 0xe00, 0x400, 0x0, 0x0, 0x0, 0x0, 0x60500060},
+			{".data", 0x10, 0x2000, 0x200, 0x1200, 0x0, 0x0, 0x0, 0x0, 0xc0300040},
+			{".rdata", 0x134, 0x3000, 0x200, 0x1400, 0x0, 0x0, 0x0, 0x0, 0x40300040},
+			{".eh_fram", 0x3a0, 0x4000, 0x400, 0x1600, 0x0, 0x0, 0x0, 0x0, 0x40300040},
+			{".bss", 0x60, 0x5000, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xc0300080},
+			{".idata", 0x378, 0x6000, 0x400, 0x1a00, 0x0, 0x0, 0x0, 0x0, 0xc0300040},
+			{".CRT", 0x18, 0x7000, 0x200, 0x1e00, 0x0, 0x0, 0x0, 0x0, 0xc0300040},
+			{".tls", 0x20, 0x8000, 0x200, 0x2000, 0x0, 0x0, 0x0, 0x0, 0xc0300040},
+		},
+		hasNoDwarfInfo: true,
+	},
+	{
+		file: "testdata/gcc-amd64-mingw-obj",
+		hdr:  FileHeader{0x8664, 0x6, 0x0, 0x198, 0x12, 0x0, 0x4},
+		sections: []*SectionHeader{
+			{".text", 0x0, 0x0, 0x30, 0x104, 0x15c, 0x0, 0x3, 0x0, 0x60500020},
+			{".data", 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xc0500040},
+			{".bss", 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xc0500080},
+			{".rdata", 0x0, 0x0, 0x10, 0x134, 0x0, 0x0, 0x0, 0x0, 0x40500040},
+			{".xdata", 0x0, 0x0, 0xc, 0x144, 0x0, 0x0, 0x0, 0x0, 0x40300040},
+			{".pdata", 0x0, 0x0, 0xc, 0x150, 0x17a, 0x0, 0x3, 0x0, 0x40300040},
+		},
+		symbols: []*Symbol{
+			{".file", 0x0, -2, 0x0, 0x67},
+			{"main", 0x0, 1, 0x20, 0x2},
+			{".text", 0x0, 1, 0x0, 0x3},
+			{".data", 0x0, 2, 0x0, 0x3},
+			{".bss", 0x0, 3, 0x0, 0x3},
+			{".rdata", 0x0, 4, 0x0, 0x3},
+			{".xdata", 0x0, 5, 0x0, 0x3},
+			{".pdata", 0x0, 6, 0x0, 0x3},
+			{"__main", 0x0, 0, 0x20, 0x2},
+			{"puts", 0x0, 0, 0x20, 0x2},
+		},
+		hasNoDwarfInfo: true,
+	},
+	{
+		file: "testdata/gcc-amd64-mingw-exec",
+		hdr:  FileHeader{0x8664, 0x11, 0x53e4364f, 0x39600, 0x6fc, 0xf0, 0x27},
+		opthdr: &OptionalHeader64{
+			0x20b, 0x2, 0x16, 0x6a00, 0x2400, 0x1600, 0x14e0, 0x1000, 0x400000, 0x1000, 0x200, 0x4, 0x0, 0x0, 0x0, 0x5, 0x2, 0x0, 0x45000, 0x600, 0x46f19, 0x3, 0x0, 0x200000, 0x1000, 0x100000, 0x1000, 0x0, 0x10,
+			[16]DataDirectory{
+				{0x0, 0x0},
+				{0xe000, 0x990},
+				{0x0, 0x0},
+				{0xa000, 0x498},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x10000, 0x28},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0xe254, 0x218},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+			}},
+		sections: []*SectionHeader{
+			{".text", 0x6860, 0x1000, 0x6a00, 0x600, 0x0, 0x0, 0x0, 0x0, 0x60500020},
+			{".data", 0xe0, 0x8000, 0x200, 0x7000, 0x0, 0x0, 0x0, 0x0, 0xc0500040},
+			{".rdata", 0x6b0, 0x9000, 0x800, 0x7200, 0x0, 0x0, 0x0, 0x0, 0x40600040},
+			{".pdata", 0x498, 0xa000, 0x600, 0x7a00, 0x0, 0x0, 0x0, 0x0, 0x40300040},
+			{".xdata", 0x488, 0xb000, 0x600, 0x8000, 0x0, 0x0, 0x0, 0x0, 0x40300040},
+			{".bss", 0x1410, 0xc000, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xc0600080},
+			{".idata", 0x990, 0xe000, 0xa00, 0x8600, 0x0, 0x0, 0x0, 0x0, 0xc0300040},
+			{".CRT", 0x68, 0xf000, 0x200, 0x9000, 0x0, 0x0, 0x0, 0x0, 0xc0400040},
+			{".tls", 0x48, 0x10000, 0x200, 0x9200, 0x0, 0x0, 0x0, 0x0, 0xc0600040},
+			{".debug_aranges", 0x600, 0x11000, 0x600, 0x9400, 0x0, 0x0, 0x0, 0x0, 0x42500040},
+			{".debug_info", 0x1316e, 0x12000, 0x13200, 0x9a00, 0x0, 0x0, 0x0, 0x0, 0x42100040},
+			{".debug_abbrev", 0x2ccb, 0x26000, 0x2e00, 0x1cc00, 0x0, 0x0, 0x0, 0x0, 0x42100040},
+			{".debug_line", 0x3c4d, 0x29000, 0x3e00, 0x1fa00, 0x0, 0x0, 0x0, 0x0, 0x42100040},
+			{".debug_frame", 0x18b8, 0x2d000, 0x1a00, 0x23800, 0x0, 0x0, 0x0, 0x0, 0x42400040},
+			{".debug_str", 0x396, 0x2f000, 0x400, 0x25200, 0x0, 0x0, 0x0, 0x0, 0x42100040},
+			{".debug_loc", 0x13240, 0x30000, 0x13400, 0x25600, 0x0, 0x0, 0x0, 0x0, 0x42100040},
+			{".debug_ranges", 0xa70, 0x44000, 0xc00, 0x38a00, 0x0, 0x0, 0x0, 0x0, 0x42100040},
+		},
+	},
+	{
+		// testdata/vmlinuz-4.15.0-47-generic is a trimmed down version of Linux Kernel image.
+		// The original Linux Kernel image is about 8M and it is not recommended to add such a big binary file to the repo.
+		// Moreover only a very small portion of the original Kernel image was being parsed by debug/pe package.
+		// In order to identify this portion, the original image was first parsed by modified debug/pe package.
+		// Modification essentially communicated reader's positions before and after parsing.
+		// Finally, bytes between those positions where written to a separate file,
+		// generating trimmed down version Linux Kernel image used in this test case.
+		file: "testdata/vmlinuz-4.15.0-47-generic",
+		hdr:  FileHeader{0x8664, 0x4, 0x0, 0x0, 0x1, 0xa0, 0x206},
+		opthdr: &OptionalHeader64{
+			0x20b, 0x2, 0x14, 0x7c0590, 0x0, 0x168f870, 0x4680, 0x200, 0x0, 0x20, 0x20, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x1e50000, 0x200, 0x7c3ab0, 0xa, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x6,
+			[16]DataDirectory{
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x7c07a0, 0x778},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+			}},
+		sections: []*SectionHeader{
+			{".setup", 0x41e0, 0x200, 0x41e0, 0x200, 0x0, 0x0, 0x0, 0x0, 0x60500020},
+			{".reloc", 0x20, 0x43e0, 0x20, 0x43e0, 0x0, 0x0, 0x0, 0x0, 0x42100040},
+			{".text", 0x7bc390, 0x4400, 0x7bc390, 0x4400, 0x0, 0x0, 0x0, 0x0, 0x60500020},
+			{".bss", 0x168f870, 0x7c0790, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xc8000080},
+		},
+		hasNoDwarfInfo: true,
+	},
+}
+
+func isOptHdrEq(a, b interface{}) bool {
+	switch va := a.(type) {
+	case *OptionalHeader32:
+		vb, ok := b.(*OptionalHeader32)
+		if !ok {
+			return false
+		}
+		return *vb == *va
+	case *OptionalHeader64:
+		vb, ok := b.(*OptionalHeader64)
+		if !ok {
+			return false
+		}
+		return *vb == *va
+	case nil:
+		return b == nil
+	}
+	return false
+}
+
+func TestOpen(t *testing.T) {
+	for i := range fileTests {
+		tt := &fileTests[i]
+
+		f, err := Open(tt.file)
+		if err != nil {
+			t.Error(err)
+			continue
+		}
+		if !reflect.DeepEqual(f.FileHeader, tt.hdr) {
+			t.Errorf("open %s:\n\thave %#v\n\twant %#v\n", tt.file, f.FileHeader, tt.hdr)
+			continue
+		}
+		if !isOptHdrEq(tt.opthdr, f.OptionalHeader) {
+			t.Errorf("open %s:\n\thave %#v\n\twant %#v\n", tt.file, f.OptionalHeader, tt.opthdr)
+			continue
+		}
+
+		for i, sh := range f.Sections {
+			if i >= len(tt.sections) {
+				break
+			}
+			have := &sh.SectionHeader
+			want := tt.sections[i]
+			if !reflect.DeepEqual(have, want) {
+				t.Errorf("open %s, section %d:\n\thave %#v\n\twant %#v\n", tt.file, i, have, want)
+			}
+		}
+		tn := len(tt.sections)
+		fn := len(f.Sections)
+		if tn != fn {
+			t.Errorf("open %s: len(Sections) = %d, want %d", tt.file, fn, tn)
+		}
+		for i, have := range f.Symbols {
+			if i >= len(tt.symbols) {
+				break
+			}
+			want := tt.symbols[i]
+			if !reflect.DeepEqual(have, want) {
+				t.Errorf("open %s, symbol %d:\n\thave %#v\n\twant %#v\n", tt.file, i, have, want)
+			}
+		}
+		if !tt.hasNoDwarfInfo {
+			_, err = f.DWARF()
+			if err != nil {
+				t.Errorf("fetching %s dwarf details failed: %v", tt.file, err)
+			}
+		}
+	}
+}
+
+func TestOpenFailure(t *testing.T) {
+	filename := "file.go"    // not a PE file
+	_, err := Open(filename) // don't crash
+	if err == nil {
+		t.Errorf("open %s: succeeded unexpectedly", filename)
+	}
+}
+
+const (
+	linkNoCgo = iota
+	linkCgoDefault
+	linkCgoInternal
+	linkCgoExternal
+)
+
+func getImageBase(f *File) uintptr {
+	switch oh := f.OptionalHeader.(type) {
+	case *OptionalHeader32:
+		return uintptr(oh.ImageBase)
+	case *OptionalHeader64:
+		return uintptr(oh.ImageBase)
+	default:
+		panic("unexpected optionalheader type")
+	}
+}
+
+func testDWARF(t *testing.T, linktype int) {
+	if runtime.GOOS != "windows" {
+		t.Skip("skipping windows only test")
+	}
+	testenv.MustHaveGoRun(t)
+
+	tmpdir := t.TempDir()
+
+	src := filepath.Join(tmpdir, "a.go")
+	file, err := os.Create(src)
+	if err != nil {
+		t.Fatal(err)
+	}
+	err = template.Must(template.New("main").Parse(testprog)).Execute(file, linktype != linkNoCgo)
+	if err != nil {
+		if err := file.Close(); err != nil {
+			t.Error(err)
+		}
+		t.Fatal(err)
+	}
+	if err := file.Close(); err != nil {
+		t.Fatal(err)
+	}
+
+	exe := filepath.Join(tmpdir, "a.exe")
+	args := []string{"build", "-o", exe}
+	switch linktype {
+	case linkNoCgo:
+	case linkCgoDefault:
+	case linkCgoInternal:
+		args = append(args, "-ldflags", "-linkmode=internal")
+	case linkCgoExternal:
+		args = append(args, "-ldflags", "-linkmode=external")
+	default:
+		t.Fatalf("invalid linktype parameter of %v", linktype)
+	}
+	args = append(args, src)
+	out, err := exec.Command(testenv.GoToolPath(t), args...).CombinedOutput()
+	if err != nil {
+		t.Fatalf("building test executable for linktype %d failed: %s %s", linktype, err, out)
+	}
+	out, err = exec.Command(exe).CombinedOutput()
+	if err != nil {
+		t.Fatalf("running test executable failed: %s %s", err, out)
+	}
+	t.Logf("Testprog output:\n%s", string(out))
+
+	matches := regexp.MustCompile("offset=(.*)\n").FindStringSubmatch(string(out))
+	if len(matches) < 2 {
+		t.Fatalf("unexpected program output: %s", out)
+	}
+	wantoffset, err := strconv.ParseUint(matches[1], 0, 64)
+	if err != nil {
+		t.Fatalf("unexpected main offset %q: %s", matches[1], err)
+	}
+
+	f, err := Open(exe)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer f.Close()
+
+	imageBase := getImageBase(f)
+
+	var foundDebugGDBScriptsSection bool
+	for _, sect := range f.Sections {
+		if sect.Name == ".debug_gdb_scripts" {
+			foundDebugGDBScriptsSection = true
+		}
+	}
+	if !foundDebugGDBScriptsSection {
+		t.Error(".debug_gdb_scripts section is not found")
+	}
+
+	d, err := f.DWARF()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// look for main.main
+	r := d.Reader()
+	for {
+		e, err := r.Next()
+		if err != nil {
+			t.Fatal("r.Next:", err)
+		}
+		if e == nil {
+			break
+		}
+		if e.Tag == dwarf.TagSubprogram {
+			name, ok := e.Val(dwarf.AttrName).(string)
+			if ok && name == "main.main" {
+				t.Logf("Found main.main")
+				addr, ok := e.Val(dwarf.AttrLowpc).(uint64)
+				if !ok {
+					t.Fatal("Failed to get AttrLowpc")
+				}
+				offset := uintptr(addr) - imageBase
+				if offset != uintptr(wantoffset) {
+					t.Fatalf("Runtime offset (0x%x) did "+
+						"not match dwarf offset "+
+						"(0x%x)", wantoffset, offset)
+				}
+				return
+			}
+		}
+	}
+	t.Fatal("main.main not found")
+}
+
+func TestBSSHasZeros(t *testing.T) {
+	testenv.MustHaveExec(t)
+
+	if runtime.GOOS != "windows" {
+		t.Skip("skipping windows only test")
+	}
+	gccpath, err := exec.LookPath("gcc")
+	if err != nil {
+		t.Skip("skipping test: gcc is missing")
+	}
+
+	tmpdir := t.TempDir()
+
+	srcpath := filepath.Join(tmpdir, "a.c")
+	src := `
+#include <stdio.h>
+
+int zero = 0;
+
+int
+main(void)
+{
+	printf("%d\n", zero);
+	return 0;
+}
+`
+	err = os.WriteFile(srcpath, []byte(src), 0644)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	objpath := filepath.Join(tmpdir, "a.obj")
+	cmd := exec.Command(gccpath, "-c", srcpath, "-o", objpath)
+	out, err := cmd.CombinedOutput()
+	if err != nil {
+		t.Fatalf("failed to build object file: %v - %v", err, string(out))
+	}
+
+	f, err := Open(objpath)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer f.Close()
+
+	var bss *Section
+	for _, sect := range f.Sections {
+		if sect.Name == ".bss" {
+			bss = sect
+			break
+		}
+	}
+	if bss == nil {
+		t.Fatal("could not find .bss section")
+	}
+	data, err := bss.Data()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(data) == 0 {
+		t.Fatalf("%s file .bss section cannot be empty", objpath)
+	}
+	for _, b := range data {
+		if b != 0 {
+			t.Fatalf(".bss section has non zero bytes: %v", data)
+		}
+	}
+}
+
+func TestDWARF(t *testing.T) {
+	testDWARF(t, linkNoCgo)
+}
+
+const testprog = `
+package main
+
+import "fmt"
+import "syscall"
+import "unsafe"
+{{if .}}import "C"
+{{end}}
+
+// struct MODULEINFO from the Windows SDK
+type moduleinfo struct {
+	BaseOfDll uintptr
+	SizeOfImage uint32
+	EntryPoint uintptr
+}
+
+func add(p unsafe.Pointer, x uintptr) unsafe.Pointer {
+	return unsafe.Pointer(uintptr(p) + x)
+}
+
+func funcPC(f interface{}) uintptr {
+	var a uintptr
+	return **(**uintptr)(add(unsafe.Pointer(&f), unsafe.Sizeof(a)))
+}
+
+func main() {
+	kernel32 := syscall.MustLoadDLL("kernel32.dll")
+	psapi := syscall.MustLoadDLL("psapi.dll")
+	getModuleHandle := kernel32.MustFindProc("GetModuleHandleW")
+	getCurrentProcess := kernel32.MustFindProc("GetCurrentProcess")
+	getModuleInformation := psapi.MustFindProc("GetModuleInformation")
+
+	procHandle, _, _ := getCurrentProcess.Call()
+	moduleHandle, _, err := getModuleHandle.Call(0)
+	if moduleHandle == 0 {
+		panic(fmt.Sprintf("GetModuleHandle() failed: %d", err))
+	}
+
+	var info moduleinfo
+	ret, _, err := getModuleInformation.Call(procHandle, moduleHandle,
+		uintptr(unsafe.Pointer(&info)), unsafe.Sizeof(info))
+
+	if ret == 0 {
+		panic(fmt.Sprintf("GetModuleInformation() failed: %d", err))
+	}
+
+	offset := funcPC(main) - info.BaseOfDll
+	fmt.Printf("base=0x%x\n", info.BaseOfDll)
+	fmt.Printf("main=%p\n", main)
+	fmt.Printf("offset=0x%x\n", offset)
+}
+`
+
+func TestBuildingWindowsGUI(t *testing.T) {
+	testenv.MustHaveGoBuild(t)
+
+	if runtime.GOOS != "windows" {
+		t.Skip("skipping windows only test")
+	}
+	tmpdir := t.TempDir()
+
+	src := filepath.Join(tmpdir, "a.go")
+	if err := os.WriteFile(src, []byte(`package main; func main() {}`), 0644); err != nil {
+		t.Fatal(err)
+	}
+	exe := filepath.Join(tmpdir, "a.exe")
+	cmd := exec.Command(testenv.GoToolPath(t), "build", "-ldflags", "-H=windowsgui", "-o", exe, src)
+	out, err := cmd.CombinedOutput()
+	if err != nil {
+		t.Fatalf("building test executable failed: %s %s", err, out)
+	}
+
+	f, err := Open(exe)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer f.Close()
+
+	switch oh := f.OptionalHeader.(type) {
+	case *OptionalHeader32:
+		if oh.Subsystem != IMAGE_SUBSYSTEM_WINDOWS_GUI {
+			t.Errorf("unexpected Subsystem value: have %d, but want %d", oh.Subsystem, IMAGE_SUBSYSTEM_WINDOWS_GUI)
+		}
+	case *OptionalHeader64:
+		if oh.Subsystem != IMAGE_SUBSYSTEM_WINDOWS_GUI {
+			t.Errorf("unexpected Subsystem value: have %d, but want %d", oh.Subsystem, IMAGE_SUBSYSTEM_WINDOWS_GUI)
+		}
+	default:
+		t.Fatalf("unexpected OptionalHeader type: have %T, but want *pe.OptionalHeader32 or *pe.OptionalHeader64", oh)
+	}
+}
+
+func TestImportTableInUnknownSection(t *testing.T) {
+	if runtime.GOOS != "windows" {
+		t.Skip("skipping Windows-only test")
+	}
+
+	// ws2_32.dll import table is located in ".rdata" section,
+	// so it is good enough to test issue #16103.
+	const filename = "ws2_32.dll"
+	path, err := exec.LookPath(filename)
+	if err != nil {
+		t.Fatalf("unable to locate required file %q in search path: %s", filename, err)
+	}
+
+	f, err := Open(path)
+	if err != nil {
+		t.Error(err)
+	}
+	defer f.Close()
+
+	// now we can extract its imports
+	symbols, err := f.ImportedSymbols()
+	if err != nil {
+		t.Error(err)
+	}
+
+	if len(symbols) == 0 {
+		t.Fatalf("unable to locate any imported symbols within file %q.", path)
+	}
+}
+
+func TestInvalidOptionalHeaderMagic(t *testing.T) {
+	// Files with invalid optional header magic should return error from NewFile()
+	// (see https://golang.org/issue/30250 and https://golang.org/issue/32126 for details).
+	// Input generated by gofuzz
+	data := []byte("\x00\x00\x00\x0000000\x00\x00\x00\x00\x00\x00\x000000" +
+		"00000000000000000000" +
+		"000000000\x00\x00\x0000000000" +
+		"00000000000000000000" +
+		"0000000000000000")
+
+	_, err := NewFile(bytes.NewReader(data))
+	if err == nil {
+		t.Fatal("NewFile succeeded unexpectedly")
+	}
+}
+
+func TestImportedSymbolsNoPanicMissingOptionalHeader(t *testing.T) {
+	// https://golang.org/issue/30250
+	// ImportedSymbols shouldn't panic if optional headers is missing
+	data, err := os.ReadFile("testdata/gcc-amd64-mingw-obj")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	f, err := NewFile(bytes.NewReader(data))
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if f.OptionalHeader != nil {
+		t.Fatal("expected f.OptionalHeader to be nil, received non-nil optional header")
+	}
+
+	syms, err := f.ImportedSymbols()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if len(syms) != 0 {
+		t.Fatalf("expected len(syms) == 0, received len(syms) = %d", len(syms))
+	}
+
+}
+
+func TestImportedSymbolsNoPanicWithSliceOutOfBound(t *testing.T) {
+	// https://golang.org/issue/30253
+	// ImportedSymbols shouldn't panic with slice out of bounds
+	// Input generated by gofuzz
+	data := []byte("L\x01\b\x00regi\x00\x00\x00\x00\x00\x00\x00\x00\xe0\x00\x0f\x03" +
+		"\v\x01\x02\x18\x00\x0e\x00\x00\x00\x1e\x00\x00\x00\x02\x00\x00\x80\x12\x00\x00" +
+		"\x00\x10\x00\x00\x00 \x00\x00\x00\x00@\x00\x00\x10\x00\x00\x00\x02\x00\x00" +
+		"\x04\x00\x00\x00\x01\x00\x00\x00\x04\x00\x00\x00\x00\x00\x00\x00\x00\x90\x00\x00" +
+		"\x00\x04\x00\x00\x06S\x00\x00\x03\x00\x00\x00\x00\x00 \x00\x00\x10\x00\x00" +
+		"\x00\x00\x10\x00\x00\x10\x00\x00\x00\x00\x00\x00\x10\x00\x00\x00\x00\x00\x00\x00" +
+		"\x00\x00\x00\x00\x00`\x00\x00x\x03\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" +
+		"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" +
+		"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" +
+		"\x00\x00\x00\x00\x00\x00\x00\x00\x04\x80\x00\x00\x18\x00\x00\x00\x00\x00\x00\x00" +
+		"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xb8`\x00\x00|\x00\x00\x00" +
+		"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" +
+		"\x00\x00\x00\x00.text\x00\x00\x00d\f\x00\x00\x00\x10\x00\x00" +
+		"\x00\x0e\x00\x00\x00\x04\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" +
+		"`\x00P`.data\x00\x00\x00\x10\x00\x00\x00\x00 \x00\x00" +
+		"\x00\x02\x00\x00\x00\x12\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" +
+		"@\x000\xc0.rdata\x00\x004\x01\x00\x00\x000\x00\x00" +
+		"\x00\x02\x00\x00\x00\x14\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" +
+		"@\x000@.eh_fram\xa0\x03\x00\x00\x00@\x00\x00" +
+		"\x00\x04\x00\x00\x00\x16\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" +
+		"@\x000@.bss\x00\x00\x00\x00`\x00\x00\x00\x00P\x00\x00" +
+		"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" +
+		"\x80\x000\xc0.idata\x00\x00x\x03\x00\x00\x00`\x00\x00" +
+		"\x04\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00@\x00" +
+		"0\xc0.CRT\x00\x00\x00\x00\x18\x00\x00\x00\x00p\x00\x00\x00\x02" +
+		"\x00\x00\x00\x1e\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00@\x00" +
+		"0\xc0.tls\x00\x00\x00\x00 \x00\x00\x00\x00\x80\x00\x00\x00\x02" +
+		"\x00\x00\x00 \x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x001\xc9" +
+		"H\x895\x1d")
+
+	f, err := NewFile(bytes.NewReader(data))
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	syms, err := f.ImportedSymbols()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if len(syms) != 0 {
+		t.Fatalf("expected len(syms) == 0, received len(syms) = %d", len(syms))
+	}
+}
diff --git a/src/debug/pe/pe.go b/src/debug/pe/pe.go
new file mode 100644
index 0000000..db112fe
--- /dev/null
+++ b/src/debug/pe/pe.go
@@ -0,0 +1,184 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package pe
+
+type FileHeader struct {
+	Machine              uint16
+	NumberOfSections     uint16
+	TimeDateStamp        uint32
+	PointerToSymbolTable uint32
+	NumberOfSymbols      uint32
+	SizeOfOptionalHeader uint16
+	Characteristics      uint16
+}
+
+type DataDirectory struct {
+	VirtualAddress uint32
+	Size           uint32
+}
+
+type OptionalHeader32 struct {
+	Magic                       uint16
+	MajorLinkerVersion          uint8
+	MinorLinkerVersion          uint8
+	SizeOfCode                  uint32
+	SizeOfInitializedData       uint32
+	SizeOfUninitializedData     uint32
+	AddressOfEntryPoint         uint32
+	BaseOfCode                  uint32
+	BaseOfData                  uint32
+	ImageBase                   uint32
+	SectionAlignment            uint32
+	FileAlignment               uint32
+	MajorOperatingSystemVersion uint16
+	MinorOperatingSystemVersion uint16
+	MajorImageVersion           uint16
+	MinorImageVersion           uint16
+	MajorSubsystemVersion       uint16
+	MinorSubsystemVersion       uint16
+	Win32VersionValue           uint32
+	SizeOfImage                 uint32
+	SizeOfHeaders               uint32
+	CheckSum                    uint32
+	Subsystem                   uint16
+	DllCharacteristics          uint16
+	SizeOfStackReserve          uint32
+	SizeOfStackCommit           uint32
+	SizeOfHeapReserve           uint32
+	SizeOfHeapCommit            uint32
+	LoaderFlags                 uint32
+	NumberOfRvaAndSizes         uint32
+	DataDirectory               [16]DataDirectory
+}
+
+type OptionalHeader64 struct {
+	Magic                       uint16
+	MajorLinkerVersion          uint8
+	MinorLinkerVersion          uint8
+	SizeOfCode                  uint32
+	SizeOfInitializedData       uint32
+	SizeOfUninitializedData     uint32
+	AddressOfEntryPoint         uint32
+	BaseOfCode                  uint32
+	ImageBase                   uint64
+	SectionAlignment            uint32
+	FileAlignment               uint32
+	MajorOperatingSystemVersion uint16
+	MinorOperatingSystemVersion uint16
+	MajorImageVersion           uint16
+	MinorImageVersion           uint16
+	MajorSubsystemVersion       uint16
+	MinorSubsystemVersion       uint16
+	Win32VersionValue           uint32
+	SizeOfImage                 uint32
+	SizeOfHeaders               uint32
+	CheckSum                    uint32
+	Subsystem                   uint16
+	DllCharacteristics          uint16
+	SizeOfStackReserve          uint64
+	SizeOfStackCommit           uint64
+	SizeOfHeapReserve           uint64
+	SizeOfHeapCommit            uint64
+	LoaderFlags                 uint32
+	NumberOfRvaAndSizes         uint32
+	DataDirectory               [16]DataDirectory
+}
+
+const (
+	IMAGE_FILE_MACHINE_UNKNOWN   = 0x0
+	IMAGE_FILE_MACHINE_AM33      = 0x1d3
+	IMAGE_FILE_MACHINE_AMD64     = 0x8664
+	IMAGE_FILE_MACHINE_ARM       = 0x1c0
+	IMAGE_FILE_MACHINE_ARMNT     = 0x1c4
+	IMAGE_FILE_MACHINE_ARM64     = 0xaa64
+	IMAGE_FILE_MACHINE_EBC       = 0xebc
+	IMAGE_FILE_MACHINE_I386      = 0x14c
+	IMAGE_FILE_MACHINE_IA64      = 0x200
+	IMAGE_FILE_MACHINE_M32R      = 0x9041
+	IMAGE_FILE_MACHINE_MIPS16    = 0x266
+	IMAGE_FILE_MACHINE_MIPSFPU   = 0x366
+	IMAGE_FILE_MACHINE_MIPSFPU16 = 0x466
+	IMAGE_FILE_MACHINE_POWERPC   = 0x1f0
+	IMAGE_FILE_MACHINE_POWERPCFP = 0x1f1
+	IMAGE_FILE_MACHINE_R4000     = 0x166
+	IMAGE_FILE_MACHINE_SH3       = 0x1a2
+	IMAGE_FILE_MACHINE_SH3DSP    = 0x1a3
+	IMAGE_FILE_MACHINE_SH4       = 0x1a6
+	IMAGE_FILE_MACHINE_SH5       = 0x1a8
+	IMAGE_FILE_MACHINE_THUMB     = 0x1c2
+	IMAGE_FILE_MACHINE_WCEMIPSV2 = 0x169
+)
+
+// IMAGE_DIRECTORY_ENTRY constants
+const (
+	IMAGE_DIRECTORY_ENTRY_EXPORT         = 0
+	IMAGE_DIRECTORY_ENTRY_IMPORT         = 1
+	IMAGE_DIRECTORY_ENTRY_RESOURCE       = 2
+	IMAGE_DIRECTORY_ENTRY_EXCEPTION      = 3
+	IMAGE_DIRECTORY_ENTRY_SECURITY       = 4
+	IMAGE_DIRECTORY_ENTRY_BASERELOC      = 5
+	IMAGE_DIRECTORY_ENTRY_DEBUG          = 6
+	IMAGE_DIRECTORY_ENTRY_ARCHITECTURE   = 7
+	IMAGE_DIRECTORY_ENTRY_GLOBALPTR      = 8
+	IMAGE_DIRECTORY_ENTRY_TLS            = 9
+	IMAGE_DIRECTORY_ENTRY_LOAD_CONFIG    = 10
+	IMAGE_DIRECTORY_ENTRY_BOUND_IMPORT   = 11
+	IMAGE_DIRECTORY_ENTRY_IAT            = 12
+	IMAGE_DIRECTORY_ENTRY_DELAY_IMPORT   = 13
+	IMAGE_DIRECTORY_ENTRY_COM_DESCRIPTOR = 14
+)
+
+// Values of IMAGE_FILE_HEADER.Characteristics. These can be combined together.
+const (
+	IMAGE_FILE_RELOCS_STRIPPED         = 0x0001
+	IMAGE_FILE_EXECUTABLE_IMAGE        = 0x0002
+	IMAGE_FILE_LINE_NUMS_STRIPPED      = 0x0004
+	IMAGE_FILE_LOCAL_SYMS_STRIPPED     = 0x0008
+	IMAGE_FILE_AGGRESIVE_WS_TRIM       = 0x0010
+	IMAGE_FILE_LARGE_ADDRESS_AWARE     = 0x0020
+	IMAGE_FILE_BYTES_REVERSED_LO       = 0x0080
+	IMAGE_FILE_32BIT_MACHINE           = 0x0100
+	IMAGE_FILE_DEBUG_STRIPPED          = 0x0200
+	IMAGE_FILE_REMOVABLE_RUN_FROM_SWAP = 0x0400
+	IMAGE_FILE_NET_RUN_FROM_SWAP       = 0x0800
+	IMAGE_FILE_SYSTEM                  = 0x1000
+	IMAGE_FILE_DLL                     = 0x2000
+	IMAGE_FILE_UP_SYSTEM_ONLY          = 0x4000
+	IMAGE_FILE_BYTES_REVERSED_HI       = 0x8000
+)
+
+// OptionalHeader64.Subsystem and OptionalHeader32.Subsystem values.
+const (
+	IMAGE_SUBSYSTEM_UNKNOWN                  = 0
+	IMAGE_SUBSYSTEM_NATIVE                   = 1
+	IMAGE_SUBSYSTEM_WINDOWS_GUI              = 2
+	IMAGE_SUBSYSTEM_WINDOWS_CUI              = 3
+	IMAGE_SUBSYSTEM_OS2_CUI                  = 5
+	IMAGE_SUBSYSTEM_POSIX_CUI                = 7
+	IMAGE_SUBSYSTEM_NATIVE_WINDOWS           = 8
+	IMAGE_SUBSYSTEM_WINDOWS_CE_GUI           = 9
+	IMAGE_SUBSYSTEM_EFI_APPLICATION          = 10
+	IMAGE_SUBSYSTEM_EFI_BOOT_SERVICE_DRIVER  = 11
+	IMAGE_SUBSYSTEM_EFI_RUNTIME_DRIVER       = 12
+	IMAGE_SUBSYSTEM_EFI_ROM                  = 13
+	IMAGE_SUBSYSTEM_XBOX                     = 14
+	IMAGE_SUBSYSTEM_WINDOWS_BOOT_APPLICATION = 16
+)
+
+// OptionalHeader64.DllCharacteristics and OptionalHeader32.DllCharacteristics
+// values. These can be combined together.
+const (
+	IMAGE_DLLCHARACTERISTICS_HIGH_ENTROPY_VA       = 0x0020
+	IMAGE_DLLCHARACTERISTICS_DYNAMIC_BASE          = 0x0040
+	IMAGE_DLLCHARACTERISTICS_FORCE_INTEGRITY       = 0x0080
+	IMAGE_DLLCHARACTERISTICS_NX_COMPAT             = 0x0100
+	IMAGE_DLLCHARACTERISTICS_NO_ISOLATION          = 0x0200
+	IMAGE_DLLCHARACTERISTICS_NO_SEH                = 0x0400
+	IMAGE_DLLCHARACTERISTICS_NO_BIND               = 0x0800
+	IMAGE_DLLCHARACTERISTICS_APPCONTAINER          = 0x1000
+	IMAGE_DLLCHARACTERISTICS_WDM_DRIVER            = 0x2000
+	IMAGE_DLLCHARACTERISTICS_GUARD_CF              = 0x4000
+	IMAGE_DLLCHARACTERISTICS_TERMINAL_SERVER_AWARE = 0x8000
+)
diff --git a/src/debug/pe/section.go b/src/debug/pe/section.go
new file mode 100644
index 0000000..b641158
--- /dev/null
+++ b/src/debug/pe/section.go
@@ -0,0 +1,111 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package pe
+
+import (
+	"encoding/binary"
+	"fmt"
+	"io"
+	"strconv"
+)
+
+// SectionHeader32 represents real PE COFF section header.
+type SectionHeader32 struct {
+	Name                 [8]uint8
+	VirtualSize          uint32
+	VirtualAddress       uint32
+	SizeOfRawData        uint32
+	PointerToRawData     uint32
+	PointerToRelocations uint32
+	PointerToLineNumbers uint32
+	NumberOfRelocations  uint16
+	NumberOfLineNumbers  uint16
+	Characteristics      uint32
+}
+
+// fullName finds real name of section sh. Normally name is stored
+// in sh.Name, but if it is longer then 8 characters, it is stored
+// in COFF string table st instead.
+func (sh *SectionHeader32) fullName(st StringTable) (string, error) {
+	if sh.Name[0] != '/' {
+		return cstring(sh.Name[:]), nil
+	}
+	i, err := strconv.Atoi(cstring(sh.Name[1:]))
+	if err != nil {
+		return "", err
+	}
+	return st.String(uint32(i))
+}
+
+// TODO(brainman): copy all IMAGE_REL_* consts from ldpe.go here
+
+// Reloc represents a PE COFF relocation.
+// Each section contains its own relocation list.
+type Reloc struct {
+	VirtualAddress   uint32
+	SymbolTableIndex uint32
+	Type             uint16
+}
+
+func readRelocs(sh *SectionHeader, r io.ReadSeeker) ([]Reloc, error) {
+	if sh.NumberOfRelocations <= 0 {
+		return nil, nil
+	}
+	_, err := r.Seek(int64(sh.PointerToRelocations), seekStart)
+	if err != nil {
+		return nil, fmt.Errorf("fail to seek to %q section relocations: %v", sh.Name, err)
+	}
+	relocs := make([]Reloc, sh.NumberOfRelocations)
+	err = binary.Read(r, binary.LittleEndian, relocs)
+	if err != nil {
+		return nil, fmt.Errorf("fail to read section relocations: %v", err)
+	}
+	return relocs, nil
+}
+
+// SectionHeader is similar to SectionHeader32 with Name
+// field replaced by Go string.
+type SectionHeader struct {
+	Name                 string
+	VirtualSize          uint32
+	VirtualAddress       uint32
+	Size                 uint32
+	Offset               uint32
+	PointerToRelocations uint32
+	PointerToLineNumbers uint32
+	NumberOfRelocations  uint16
+	NumberOfLineNumbers  uint16
+	Characteristics      uint32
+}
+
+// Section provides access to PE COFF section.
+type Section struct {
+	SectionHeader
+	Relocs []Reloc
+
+	// Embed ReaderAt for ReadAt method.
+	// Do not embed SectionReader directly
+	// to avoid having Read and Seek.
+	// If a client wants Read and Seek it must use
+	// Open() to avoid fighting over the seek offset
+	// with other clients.
+	io.ReaderAt
+	sr *io.SectionReader
+}
+
+// Data reads and returns the contents of the PE section s.
+func (s *Section) Data() ([]byte, error) {
+	dat := make([]byte, s.sr.Size())
+	n, err := s.sr.ReadAt(dat, 0)
+	if n == len(dat) {
+		err = nil
+	}
+	return dat[0:n], err
+}
+
+// Open returns a new ReadSeeker reading the PE section s.
+func (s *Section) Open() io.ReadSeeker {
+	return io.NewSectionReader(s.sr, 0, 1<<63-1)
+}
diff --git a/src/debug/pe/string.go b/src/debug/pe/string.go
new file mode 100644
index 0000000..cab0366
--- /dev/null
+++ b/src/debug/pe/string.go
@@ -0,0 +1,68 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package pe
+
+import (
+	"bytes"
+	"encoding/binary"
+	"fmt"
+	"io"
+)
+
+// cstring converts ASCII byte sequence b to string.
+// It stops once it finds 0 or reaches end of b.
+func cstring(b []byte) string {
+	i := bytes.IndexByte(b, 0)
+	if i == -1 {
+		i = len(b)
+	}
+	return string(b[:i])
+}
+
+// StringTable is a COFF string table.
+type StringTable []byte
+
+func readStringTable(fh *FileHeader, r io.ReadSeeker) (StringTable, error) {
+	// COFF string table is located right after COFF symbol table.
+	if fh.PointerToSymbolTable <= 0 {
+		return nil, nil
+	}
+	offset := fh.PointerToSymbolTable + COFFSymbolSize*fh.NumberOfSymbols
+	_, err := r.Seek(int64(offset), seekStart)
+	if err != nil {
+		return nil, fmt.Errorf("fail to seek to string table: %v", err)
+	}
+	var l uint32
+	err = binary.Read(r, binary.LittleEndian, &l)
+	if err != nil {
+		return nil, fmt.Errorf("fail to read string table length: %v", err)
+	}
+	// string table length includes itself
+	if l <= 4 {
+		return nil, nil
+	}
+	l -= 4
+	buf := make([]byte, l)
+	_, err = io.ReadFull(r, buf)
+	if err != nil {
+		return nil, fmt.Errorf("fail to read string table: %v", err)
+	}
+	return StringTable(buf), nil
+}
+
+// TODO(brainman): decide if start parameter should be int instead of uint32
+
+// String extracts string from COFF string table st at offset start.
+func (st StringTable) String(start uint32) (string, error) {
+	// start includes 4 bytes of string table length
+	if start < 4 {
+		return "", fmt.Errorf("offset %d is before the start of string table", start)
+	}
+	start -= 4
+	if int(start) > len(st) {
+		return "", fmt.Errorf("offset %d is beyond the end of string table", start)
+	}
+	return cstring(st[start:]), nil
+}
diff --git a/src/debug/pe/symbol.go b/src/debug/pe/symbol.go
new file mode 100644
index 0000000..7fa5948
--- /dev/null
+++ b/src/debug/pe/symbol.go
@@ -0,0 +1,98 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package pe
+
+import (
+	"encoding/binary"
+	"fmt"
+	"io"
+)
+
+const COFFSymbolSize = 18
+
+// COFFSymbol represents single COFF symbol table record.
+type COFFSymbol struct {
+	Name               [8]uint8
+	Value              uint32
+	SectionNumber      int16
+	Type               uint16
+	StorageClass       uint8
+	NumberOfAuxSymbols uint8
+}
+
+func readCOFFSymbols(fh *FileHeader, r io.ReadSeeker) ([]COFFSymbol, error) {
+	if fh.PointerToSymbolTable == 0 {
+		return nil, nil
+	}
+	if fh.NumberOfSymbols <= 0 {
+		return nil, nil
+	}
+	_, err := r.Seek(int64(fh.PointerToSymbolTable), seekStart)
+	if err != nil {
+		return nil, fmt.Errorf("fail to seek to symbol table: %v", err)
+	}
+	syms := make([]COFFSymbol, fh.NumberOfSymbols)
+	err = binary.Read(r, binary.LittleEndian, syms)
+	if err != nil {
+		return nil, fmt.Errorf("fail to read symbol table: %v", err)
+	}
+	return syms, nil
+}
+
+// isSymNameOffset checks symbol name if it is encoded as offset into string table.
+func isSymNameOffset(name [8]byte) (bool, uint32) {
+	if name[0] == 0 && name[1] == 0 && name[2] == 0 && name[3] == 0 {
+		return true, binary.LittleEndian.Uint32(name[4:])
+	}
+	return false, 0
+}
+
+// FullName finds real name of symbol sym. Normally name is stored
+// in sym.Name, but if it is longer then 8 characters, it is stored
+// in COFF string table st instead.
+func (sym *COFFSymbol) FullName(st StringTable) (string, error) {
+	if ok, offset := isSymNameOffset(sym.Name); ok {
+		return st.String(offset)
+	}
+	return cstring(sym.Name[:]), nil
+}
+
+func removeAuxSymbols(allsyms []COFFSymbol, st StringTable) ([]*Symbol, error) {
+	if len(allsyms) == 0 {
+		return nil, nil
+	}
+	syms := make([]*Symbol, 0)
+	aux := uint8(0)
+	for _, sym := range allsyms {
+		if aux > 0 {
+			aux--
+			continue
+		}
+		name, err := sym.FullName(st)
+		if err != nil {
+			return nil, err
+		}
+		aux = sym.NumberOfAuxSymbols
+		s := &Symbol{
+			Name:          name,
+			Value:         sym.Value,
+			SectionNumber: sym.SectionNumber,
+			Type:          sym.Type,
+			StorageClass:  sym.StorageClass,
+		}
+		syms = append(syms, s)
+	}
+	return syms, nil
+}
+
+// Symbol is similar to COFFSymbol with Name field replaced
+// by Go string. Symbol also does not have NumberOfAuxSymbols.
+type Symbol struct {
+	Name          string
+	Value         uint32
+	SectionNumber int16
+	Type          uint16
+	StorageClass  uint8
+}
diff --git a/src/debug/pe/testdata/gcc-386-mingw-exec b/src/debug/pe/testdata/gcc-386-mingw-exec
new file mode 100644
index 0000000..4b808d0
--- /dev/null
+++ b/src/debug/pe/testdata/gcc-386-mingw-exec
diff --git a/src/debug/pe/testdata/gcc-386-mingw-no-symbols-exec b/src/debug/pe/testdata/gcc-386-mingw-no-symbols-exec
new file mode 100644
index 0000000..329dca6
--- /dev/null
+++ b/src/debug/pe/testdata/gcc-386-mingw-no-symbols-exec
diff --git a/src/debug/pe/testdata/gcc-386-mingw-obj b/src/debug/pe/testdata/gcc-386-mingw-obj
new file mode 100644
index 0000000..0c84d89
--- /dev/null
+++ b/src/debug/pe/testdata/gcc-386-mingw-obj
diff --git a/src/debug/pe/testdata/gcc-amd64-mingw-exec b/src/debug/pe/testdata/gcc-amd64-mingw-exec
new file mode 100644
index 0000000..ce6feb6
--- /dev/null
+++ b/src/debug/pe/testdata/gcc-amd64-mingw-exec
diff --git a/src/debug/pe/testdata/gcc-amd64-mingw-obj b/src/debug/pe/testdata/gcc-amd64-mingw-obj
new file mode 100644
index 0000000..48ae792
--- /dev/null
+++ b/src/debug/pe/testdata/gcc-amd64-mingw-obj
diff --git a/src/debug/pe/testdata/hello.c b/src/debug/pe/testdata/hello.c
new file mode 100644
index 0000000..a689d36
--- /dev/null
+++ b/src/debug/pe/testdata/hello.c
@@ -0,0 +1,8 @@
+#include <stdio.h>
+
+int
+main(void)
+{
+	printf("hello, world\n");
+	return 0;
+}
diff --git a/src/debug/pe/testdata/vmlinuz-4.15.0-47-generic b/src/debug/pe/testdata/vmlinuz-4.15.0-47-generic
new file mode 100644
index 0000000..d01cf61
--- /dev/null
+++ b/src/debug/pe/testdata/vmlinuz-4.15.0-47-generic
diff --git a/src/debug/plan9obj/file.go b/src/debug/plan9obj/file.go
new file mode 100644
index 0000000..314608d
--- /dev/null
+++ b/src/debug/plan9obj/file.go
@@ -0,0 +1,328 @@
+// Copyright 2014 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package plan9obj implements access to Plan 9 a.out object files.
+package plan9obj
+
+import (
+	"encoding/binary"
+	"errors"
+	"fmt"
+	"io"
+	"os"
+)
+
+// A FileHeader represents a Plan 9 a.out file header.
+type FileHeader struct {
+	Magic       uint32
+	Bss         uint32
+	Entry       uint64
+	PtrSize     int
+	LoadAddress uint64
+	HdrSize     uint64
+}
+
+// A File represents an open Plan 9 a.out file.
+type File struct {
+	FileHeader
+	Sections []*Section
+	closer   io.Closer
+}
+
+// A SectionHeader represents a single Plan 9 a.out section header.
+// This structure doesn't exist on-disk, but eases navigation
+// through the object file.
+type SectionHeader struct {
+	Name   string
+	Size   uint32
+	Offset uint32
+}
+
+// A Section represents a single section in a Plan 9 a.out file.
+type Section struct {
+	SectionHeader
+
+	// Embed ReaderAt for ReadAt method.
+	// Do not embed SectionReader directly
+	// to avoid having Read and Seek.
+	// If a client wants Read and Seek it must use
+	// Open() to avoid fighting over the seek offset
+	// with other clients.
+	io.ReaderAt
+	sr *io.SectionReader
+}
+
+// Data reads and returns the contents of the Plan 9 a.out section.
+func (s *Section) Data() ([]byte, error) {
+	dat := make([]byte, s.sr.Size())
+	n, err := s.sr.ReadAt(dat, 0)
+	if n == len(dat) {
+		err = nil
+	}
+	return dat[0:n], err
+}
+
+// Open returns a new ReadSeeker reading the Plan 9 a.out section.
+func (s *Section) Open() io.ReadSeeker { return io.NewSectionReader(s.sr, 0, 1<<63-1) }
+
+// A Symbol represents an entry in a Plan 9 a.out symbol table section.
+type Sym struct {
+	Value uint64
+	Type  rune
+	Name  string
+}
+
+/*
+ * Plan 9 a.out reader
+ */
+
+// formatError is returned by some operations if the data does
+// not have the correct format for an object file.
+type formatError struct {
+	off int
+	msg string
+	val interface{}
+}
+
+func (e *formatError) Error() string {
+	msg := e.msg
+	if e.val != nil {
+		msg += fmt.Sprintf(" '%v'", e.val)
+	}
+	msg += fmt.Sprintf(" in record at byte %#x", e.off)
+	return msg
+}
+
+// Open opens the named file using os.Open and prepares it for use as a Plan 9 a.out binary.
+func Open(name string) (*File, error) {
+	f, err := os.Open(name)
+	if err != nil {
+		return nil, err
+	}
+	ff, err := NewFile(f)
+	if err != nil {
+		f.Close()
+		return nil, err
+	}
+	ff.closer = f
+	return ff, nil
+}
+
+// Close closes the File.
+// If the File was created using NewFile directly instead of Open,
+// Close has no effect.
+func (f *File) Close() error {
+	var err error
+	if f.closer != nil {
+		err = f.closer.Close()
+		f.closer = nil
+	}
+	return err
+}
+
+func parseMagic(magic []byte) (uint32, error) {
+	m := binary.BigEndian.Uint32(magic)
+	switch m {
+	case Magic386, MagicAMD64, MagicARM:
+		return m, nil
+	}
+	return 0, &formatError{0, "bad magic number", magic}
+}
+
+// NewFile creates a new File for accessing a Plan 9 binary in an underlying reader.
+// The Plan 9 binary is expected to start at position 0 in the ReaderAt.
+func NewFile(r io.ReaderAt) (*File, error) {
+	sr := io.NewSectionReader(r, 0, 1<<63-1)
+	// Read and decode Plan 9 magic
+	var magic [4]byte
+	if _, err := r.ReadAt(magic[:], 0); err != nil {
+		return nil, err
+	}
+	_, err := parseMagic(magic[:])
+	if err != nil {
+		return nil, err
+	}
+
+	ph := new(prog)
+	if err := binary.Read(sr, binary.BigEndian, ph); err != nil {
+		return nil, err
+	}
+
+	f := &File{FileHeader: FileHeader{
+		Magic:       ph.Magic,
+		Bss:         ph.Bss,
+		Entry:       uint64(ph.Entry),
+		PtrSize:     4,
+		LoadAddress: 0x1000,
+		HdrSize:     4 * 8,
+	}}
+
+	if ph.Magic&Magic64 != 0 {
+		if err := binary.Read(sr, binary.BigEndian, &f.Entry); err != nil {
+			return nil, err
+		}
+		f.PtrSize = 8
+		f.LoadAddress = 0x200000
+		f.HdrSize += 8
+	}
+
+	var sects = []struct {
+		name string
+		size uint32
+	}{
+		{"text", ph.Text},
+		{"data", ph.Data},
+		{"syms", ph.Syms},
+		{"spsz", ph.Spsz},
+		{"pcsz", ph.Pcsz},
+	}
+
+	f.Sections = make([]*Section, 5)
+
+	off := uint32(f.HdrSize)
+
+	for i, sect := range sects {
+		s := new(Section)
+		s.SectionHeader = SectionHeader{
+			Name:   sect.name,
+			Size:   sect.size,
+			Offset: off,
+		}
+		off += sect.size
+		s.sr = io.NewSectionReader(r, int64(s.Offset), int64(s.Size))
+		s.ReaderAt = s.sr
+		f.Sections[i] = s
+	}
+
+	return f, nil
+}
+
+func walksymtab(data []byte, ptrsz int, fn func(sym) error) error {
+	var order binary.ByteOrder = binary.BigEndian
+	var s sym
+	p := data
+	for len(p) >= 4 {
+		// Symbol type, value.
+		if len(p) < ptrsz {
+			return &formatError{len(data), "unexpected EOF", nil}
+		}
+		// fixed-width value
+		if ptrsz == 8 {
+			s.value = order.Uint64(p[0:8])
+			p = p[8:]
+		} else {
+			s.value = uint64(order.Uint32(p[0:4]))
+			p = p[4:]
+		}
+
+		var typ byte
+		typ = p[0] & 0x7F
+		s.typ = typ
+		p = p[1:]
+
+		// Name.
+		var i int
+		var nnul int
+		for i = 0; i < len(p); i++ {
+			if p[i] == 0 {
+				nnul = 1
+				break
+			}
+		}
+		switch typ {
+		case 'z', 'Z':
+			p = p[i+nnul:]
+			for i = 0; i+2 <= len(p); i += 2 {
+				if p[i] == 0 && p[i+1] == 0 {
+					nnul = 2
+					break
+				}
+			}
+		}
+		if len(p) < i+nnul {
+			return &formatError{len(data), "unexpected EOF", nil}
+		}
+		s.name = p[0:i]
+		i += nnul
+		p = p[i:]
+
+		fn(s)
+	}
+	return nil
+}
+
+// NewTable decodes the Go symbol table in data,
+// returning an in-memory representation.
+func newTable(symtab []byte, ptrsz int) ([]Sym, error) {
+	var n int
+	err := walksymtab(symtab, ptrsz, func(s sym) error {
+		n++
+		return nil
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	fname := make(map[uint16]string)
+	syms := make([]Sym, 0, n)
+	err = walksymtab(symtab, ptrsz, func(s sym) error {
+		n := len(syms)
+		syms = syms[0 : n+1]
+		ts := &syms[n]
+		ts.Type = rune(s.typ)
+		ts.Value = s.value
+		switch s.typ {
+		default:
+			ts.Name = string(s.name)
+		case 'z', 'Z':
+			for i := 0; i < len(s.name); i += 2 {
+				eltIdx := binary.BigEndian.Uint16(s.name[i : i+2])
+				elt, ok := fname[eltIdx]
+				if !ok {
+					return &formatError{-1, "bad filename code", eltIdx}
+				}
+				if n := len(ts.Name); n > 0 && ts.Name[n-1] != '/' {
+					ts.Name += "/"
+				}
+				ts.Name += elt
+			}
+		}
+		switch s.typ {
+		case 'f':
+			fname[uint16(s.value)] = ts.Name
+		}
+		return nil
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	return syms, nil
+}
+
+// Symbols returns the symbol table for f.
+func (f *File) Symbols() ([]Sym, error) {
+	symtabSection := f.Section("syms")
+	if symtabSection == nil {
+		return nil, errors.New("no symbol section")
+	}
+
+	symtab, err := symtabSection.Data()
+	if err != nil {
+		return nil, errors.New("cannot load symbol section")
+	}
+
+	return newTable(symtab, f.PtrSize)
+}
+
+// Section returns a section with the given name, or nil if no such
+// section exists.
+func (f *File) Section(name string) *Section {
+	for _, s := range f.Sections {
+		if s.Name == name {
+			return s
+		}
+	}
+	return nil
+}
diff --git a/src/debug/plan9obj/file_test.go b/src/debug/plan9obj/file_test.go
new file mode 100644
index 0000000..7e107bc
--- /dev/null
+++ b/src/debug/plan9obj/file_test.go
@@ -0,0 +1,81 @@
+// Copyright 2014 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package plan9obj
+
+import (
+	"reflect"
+	"testing"
+)
+
+type fileTest struct {
+	file     string
+	hdr      FileHeader
+	sections []*SectionHeader
+}
+
+var fileTests = []fileTest{
+	{
+		"testdata/386-plan9-exec",
+		FileHeader{Magic386, 0x324, 0x14, 4, 0x1000, 32},
+		[]*SectionHeader{
+			{"text", 0x4c5f, 0x20},
+			{"data", 0x94c, 0x4c7f},
+			{"syms", 0x2c2b, 0x55cb},
+			{"spsz", 0x0, 0x81f6},
+			{"pcsz", 0xf7a, 0x81f6},
+		},
+	},
+	{
+		"testdata/amd64-plan9-exec",
+		FileHeader{MagicAMD64, 0x618, 0x13, 8, 0x200000, 40},
+		[]*SectionHeader{
+			{"text", 0x4213, 0x28},
+			{"data", 0xa80, 0x423b},
+			{"syms", 0x2c8c, 0x4cbb},
+			{"spsz", 0x0, 0x7947},
+			{"pcsz", 0xca0, 0x7947},
+		},
+	},
+}
+
+func TestOpen(t *testing.T) {
+	for i := range fileTests {
+		tt := &fileTests[i]
+
+		f, err := Open(tt.file)
+		if err != nil {
+			t.Error(err)
+			continue
+		}
+		if !reflect.DeepEqual(f.FileHeader, tt.hdr) {
+			t.Errorf("open %s:\n\thave %#v\n\twant %#v\n", tt.file, f.FileHeader, tt.hdr)
+			continue
+		}
+
+		for i, sh := range f.Sections {
+			if i >= len(tt.sections) {
+				break
+			}
+			have := &sh.SectionHeader
+			want := tt.sections[i]
+			if !reflect.DeepEqual(have, want) {
+				t.Errorf("open %s, section %d:\n\thave %#v\n\twant %#v\n", tt.file, i, have, want)
+			}
+		}
+		tn := len(tt.sections)
+		fn := len(f.Sections)
+		if tn != fn {
+			t.Errorf("open %s: len(Sections) = %d, want %d", tt.file, fn, tn)
+		}
+	}
+}
+
+func TestOpenFailure(t *testing.T) {
+	filename := "file.go"    // not a Plan 9 a.out file
+	_, err := Open(filename) // don't crash
+	if err == nil {
+		t.Errorf("open %s: succeeded unexpectedly", filename)
+	}
+}
diff --git a/src/debug/plan9obj/plan9obj.go b/src/debug/plan9obj/plan9obj.go
new file mode 100644
index 0000000..7a19451
--- /dev/null
+++ b/src/debug/plan9obj/plan9obj.go
@@ -0,0 +1,36 @@
+// Copyright 2014 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+/*
+ * Plan 9 a.out constants and data structures
+ */
+
+package plan9obj
+
+// Plan 9 Program header.
+type prog struct {
+	Magic uint32 /* magic number */
+	Text  uint32 /* size of text segment */
+	Data  uint32 /* size of initialized data */
+	Bss   uint32 /* size of uninitialized data */
+	Syms  uint32 /* size of symbol table */
+	Entry uint32 /* entry point */
+	Spsz  uint32 /* size of pc/sp offset table */
+	Pcsz  uint32 /* size of pc/line number table */
+}
+
+// Plan 9 symbol table entries.
+type sym struct {
+	value uint64
+	typ   byte
+	name  []byte
+}
+
+const (
+	Magic64 = 0x8000 // 64-bit expanded header
+
+	Magic386   = (4*11+0)*11 + 7
+	MagicAMD64 = (4*26+0)*26 + 7 + Magic64
+	MagicARM   = (4*20+0)*20 + 7
+)
diff --git a/src/debug/plan9obj/testdata/386-plan9-exec b/src/debug/plan9obj/testdata/386-plan9-exec
new file mode 100644
index 0000000..748e83f
--- /dev/null
+++ b/src/debug/plan9obj/testdata/386-plan9-exec
diff --git a/src/debug/plan9obj/testdata/amd64-plan9-exec b/src/debug/plan9obj/testdata/amd64-plan9-exec
new file mode 100644
index 0000000..3e257dd
--- /dev/null
+++ b/src/debug/plan9obj/testdata/amd64-plan9-exec
diff --git a/src/debug/plan9obj/testdata/hello.c b/src/debug/plan9obj/testdata/hello.c
new file mode 100644
index 0000000..c0d633e
--- /dev/null
+++ b/src/debug/plan9obj/testdata/hello.c
@@ -0,0 +1,8 @@
+#include <u.h>
+#include <libc.h>
+
+void
+main(void)
+{
+	print("hello, world\n");
+}