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-rw-r--r--src/cmd/link/internal/amd64/asm.go676
-rw-r--r--src/cmd/link/internal/amd64/l.go43
-rw-r--r--src/cmd/link/internal/amd64/obj.go122
3 files changed, 841 insertions, 0 deletions
diff --git a/src/cmd/link/internal/amd64/asm.go b/src/cmd/link/internal/amd64/asm.go
new file mode 100644
index 0000000..2d09a61
--- /dev/null
+++ b/src/cmd/link/internal/amd64/asm.go
@@ -0,0 +1,676 @@
+// Inferno utils/6l/asm.c
+// https://bitbucket.org/inferno-os/inferno-os/src/master/utils/6l/asm.c
+//
+// Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
+// Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net)
+// Portions Copyright © 1997-1999 Vita Nuova Limited
+// Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com)
+// Portions Copyright © 2004,2006 Bruce Ellis
+// Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net)
+// Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others
+// Portions Copyright © 2009 The Go Authors. All rights reserved.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+package amd64
+
+import (
+ "cmd/internal/objabi"
+ "cmd/internal/sys"
+ "cmd/link/internal/ld"
+ "cmd/link/internal/loader"
+ "cmd/link/internal/sym"
+ "debug/elf"
+ "log"
+)
+
+func PADDR(x uint32) uint32 {
+ return x &^ 0x80000000
+}
+
+func gentext(ctxt *ld.Link, ldr *loader.Loader) {
+ initfunc, addmoduledata := ld.PrepareAddmoduledata(ctxt)
+ if initfunc == nil {
+ return
+ }
+
+ o := func(op ...uint8) {
+ for _, op1 := range op {
+ initfunc.AddUint8(op1)
+ }
+ }
+
+ // 0000000000000000 <local.dso_init>:
+ // 0: 48 8d 3d 00 00 00 00 lea 0x0(%rip),%rdi # 7 <local.dso_init+0x7>
+ // 3: R_X86_64_PC32 runtime.firstmoduledata-0x4
+ o(0x48, 0x8d, 0x3d)
+ initfunc.AddPCRelPlus(ctxt.Arch, ctxt.Moduledata, 0)
+ // 7: e8 00 00 00 00 callq c <local.dso_init+0xc>
+ // 8: R_X86_64_PLT32 runtime.addmoduledata-0x4
+ o(0xe8)
+ initfunc.AddSymRef(ctxt.Arch, addmoduledata, 0, objabi.R_CALL, 4)
+ // c: c3 retq
+ o(0xc3)
+}
+
+func adddynrel(target *ld.Target, ldr *loader.Loader, syms *ld.ArchSyms, s loader.Sym, r loader.Reloc, rIdx int) bool {
+ targ := r.Sym()
+ var targType sym.SymKind
+ if targ != 0 {
+ targType = ldr.SymType(targ)
+ }
+
+ switch rt := r.Type(); rt {
+ default:
+ if rt >= objabi.ElfRelocOffset {
+ ldr.Errorf(s, "unexpected relocation type %d (%s)", r.Type(), sym.RelocName(target.Arch, r.Type()))
+ return false
+ }
+
+ // Handle relocations found in ELF object files.
+ case objabi.ElfRelocOffset + objabi.RelocType(elf.R_X86_64_PC32):
+ if targType == sym.SDYNIMPORT {
+ ldr.Errorf(s, "unexpected R_X86_64_PC32 relocation for dynamic symbol %s", ldr.SymName(targ))
+ }
+ // TODO(mwhudson): the test of VisibilityHidden here probably doesn't make
+ // sense and should be removed when someone has thought about it properly.
+ if (targType == 0 || targType == sym.SXREF) && !ldr.AttrVisibilityHidden(targ) {
+ ldr.Errorf(s, "unknown symbol %s in pcrel", ldr.SymName(targ))
+ }
+ su := ldr.MakeSymbolUpdater(s)
+ su.SetRelocType(rIdx, objabi.R_PCREL)
+ su.SetRelocAdd(rIdx, r.Add()+4)
+ return true
+
+ case objabi.ElfRelocOffset + objabi.RelocType(elf.R_X86_64_PC64):
+ if targType == sym.SDYNIMPORT {
+ ldr.Errorf(s, "unexpected R_X86_64_PC64 relocation for dynamic symbol %s", ldr.SymName(targ))
+ }
+ if targType == 0 || targType == sym.SXREF {
+ ldr.Errorf(s, "unknown symbol %s in pcrel", ldr.SymName(targ))
+ }
+ su := ldr.MakeSymbolUpdater(s)
+ su.SetRelocType(rIdx, objabi.R_PCREL)
+ su.SetRelocAdd(rIdx, r.Add()+8)
+ return true
+
+ case objabi.ElfRelocOffset + objabi.RelocType(elf.R_X86_64_PLT32):
+ su := ldr.MakeSymbolUpdater(s)
+ su.SetRelocType(rIdx, objabi.R_PCREL)
+ su.SetRelocAdd(rIdx, r.Add()+4)
+ if targType == sym.SDYNIMPORT {
+ addpltsym(target, ldr, syms, targ)
+ su.SetRelocSym(rIdx, syms.PLT)
+ su.SetRelocAdd(rIdx, r.Add()+int64(ldr.SymPlt(targ)))
+ }
+
+ return true
+
+ case objabi.ElfRelocOffset + objabi.RelocType(elf.R_X86_64_GOTPCREL),
+ objabi.ElfRelocOffset + objabi.RelocType(elf.R_X86_64_GOTPCRELX),
+ objabi.ElfRelocOffset + objabi.RelocType(elf.R_X86_64_REX_GOTPCRELX):
+ su := ldr.MakeSymbolUpdater(s)
+ if targType != sym.SDYNIMPORT {
+ // have symbol
+ sData := ldr.Data(s)
+ if r.Off() >= 2 && sData[r.Off()-2] == 0x8b {
+ su.MakeWritable()
+ // turn MOVQ of GOT entry into LEAQ of symbol itself
+ writeableData := su.Data()
+ writeableData[r.Off()-2] = 0x8d
+ su.SetRelocType(rIdx, objabi.R_PCREL)
+ su.SetRelocAdd(rIdx, r.Add()+4)
+ return true
+ }
+ }
+
+ // fall back to using GOT and hope for the best (CMOV*)
+ // TODO: just needs relocation, no need to put in .dynsym
+ ld.AddGotSym(target, ldr, syms, targ, uint32(elf.R_X86_64_GLOB_DAT))
+
+ su.SetRelocType(rIdx, objabi.R_PCREL)
+ su.SetRelocSym(rIdx, syms.GOT)
+ su.SetRelocAdd(rIdx, r.Add()+4+int64(ldr.SymGot(targ)))
+ return true
+
+ case objabi.ElfRelocOffset + objabi.RelocType(elf.R_X86_64_64):
+ if targType == sym.SDYNIMPORT {
+ ldr.Errorf(s, "unexpected R_X86_64_64 relocation for dynamic symbol %s", ldr.SymName(targ))
+ }
+ su := ldr.MakeSymbolUpdater(s)
+ su.SetRelocType(rIdx, objabi.R_ADDR)
+ if target.IsPIE() && target.IsInternal() {
+ // For internal linking PIE, this R_ADDR relocation cannot
+ // be resolved statically. We need to generate a dynamic
+ // relocation. Let the code below handle it.
+ break
+ }
+ return true
+
+ // Handle relocations found in Mach-O object files.
+ case objabi.MachoRelocOffset + ld.MACHO_X86_64_RELOC_UNSIGNED*2 + 0,
+ objabi.MachoRelocOffset + ld.MACHO_X86_64_RELOC_SIGNED*2 + 0,
+ objabi.MachoRelocOffset + ld.MACHO_X86_64_RELOC_BRANCH*2 + 0:
+ su := ldr.MakeSymbolUpdater(s)
+ su.SetRelocType(rIdx, objabi.R_ADDR)
+
+ if targType == sym.SDYNIMPORT {
+ ldr.Errorf(s, "unexpected reloc for dynamic symbol %s", ldr.SymName(targ))
+ }
+ if target.IsPIE() && target.IsInternal() {
+ // For internal linking PIE, this R_ADDR relocation cannot
+ // be resolved statically. We need to generate a dynamic
+ // relocation. Let the code below handle it.
+ if rt == objabi.MachoRelocOffset+ld.MACHO_X86_64_RELOC_UNSIGNED*2 {
+ break
+ } else {
+ // MACHO_X86_64_RELOC_SIGNED or MACHO_X86_64_RELOC_BRANCH
+ // Can this happen? The object is expected to be PIC.
+ ldr.Errorf(s, "unsupported relocation for PIE: %v", rt)
+ }
+ }
+ return true
+
+ case objabi.MachoRelocOffset + ld.MACHO_X86_64_RELOC_BRANCH*2 + 1:
+ if targType == sym.SDYNIMPORT {
+ addpltsym(target, ldr, syms, targ)
+ su := ldr.MakeSymbolUpdater(s)
+ su.SetRelocSym(rIdx, syms.PLT)
+ su.SetRelocType(rIdx, objabi.R_PCREL)
+ su.SetRelocAdd(rIdx, int64(ldr.SymPlt(targ)))
+ return true
+ }
+ fallthrough
+
+ case objabi.MachoRelocOffset + ld.MACHO_X86_64_RELOC_UNSIGNED*2 + 1,
+ objabi.MachoRelocOffset + ld.MACHO_X86_64_RELOC_SIGNED*2 + 1,
+ objabi.MachoRelocOffset + ld.MACHO_X86_64_RELOC_SIGNED_1*2 + 1,
+ objabi.MachoRelocOffset + ld.MACHO_X86_64_RELOC_SIGNED_2*2 + 1,
+ objabi.MachoRelocOffset + ld.MACHO_X86_64_RELOC_SIGNED_4*2 + 1:
+ su := ldr.MakeSymbolUpdater(s)
+ su.SetRelocType(rIdx, objabi.R_PCREL)
+
+ if targType == sym.SDYNIMPORT {
+ ldr.Errorf(s, "unexpected pc-relative reloc for dynamic symbol %s", ldr.SymName(targ))
+ }
+ return true
+
+ case objabi.MachoRelocOffset + ld.MACHO_X86_64_RELOC_GOT_LOAD*2 + 1:
+ if targType != sym.SDYNIMPORT {
+ // have symbol
+ // turn MOVQ of GOT entry into LEAQ of symbol itself
+ sdata := ldr.Data(s)
+ if r.Off() < 2 || sdata[r.Off()-2] != 0x8b {
+ ldr.Errorf(s, "unexpected GOT_LOAD reloc for non-dynamic symbol %s", ldr.SymName(targ))
+ return false
+ }
+
+ su := ldr.MakeSymbolUpdater(s)
+ su.MakeWritable()
+ sdata = su.Data()
+ sdata[r.Off()-2] = 0x8d
+ su.SetRelocType(rIdx, objabi.R_PCREL)
+ return true
+ }
+ fallthrough
+
+ case objabi.MachoRelocOffset + ld.MACHO_X86_64_RELOC_GOT*2 + 1:
+ if targType != sym.SDYNIMPORT {
+ ldr.Errorf(s, "unexpected GOT reloc for non-dynamic symbol %s", ldr.SymName(targ))
+ }
+ ld.AddGotSym(target, ldr, syms, targ, 0)
+ su := ldr.MakeSymbolUpdater(s)
+ su.SetRelocType(rIdx, objabi.R_PCREL)
+ su.SetRelocSym(rIdx, syms.GOT)
+ su.SetRelocAdd(rIdx, r.Add()+int64(ldr.SymGot(targ)))
+ return true
+ }
+
+ // Reread the reloc to incorporate any changes in type above.
+ relocs := ldr.Relocs(s)
+ r = relocs.At(rIdx)
+
+ switch r.Type() {
+ case objabi.R_CALL,
+ objabi.R_PCREL:
+ if targType != sym.SDYNIMPORT {
+ // nothing to do, the relocation will be laid out in reloc
+ return true
+ }
+ if target.IsExternal() {
+ // External linker will do this relocation.
+ return true
+ }
+ // Internal linking, for both ELF and Mach-O.
+ // Build a PLT entry and change the relocation target to that entry.
+ addpltsym(target, ldr, syms, targ)
+ su := ldr.MakeSymbolUpdater(s)
+ su.SetRelocSym(rIdx, syms.PLT)
+ su.SetRelocAdd(rIdx, int64(ldr.SymPlt(targ)))
+ return true
+
+ case objabi.R_ADDR:
+ if ldr.SymType(s) == sym.STEXT && target.IsElf() {
+ su := ldr.MakeSymbolUpdater(s)
+ if target.IsSolaris() {
+ addpltsym(target, ldr, syms, targ)
+ su.SetRelocSym(rIdx, syms.PLT)
+ su.SetRelocAdd(rIdx, r.Add()+int64(ldr.SymPlt(targ)))
+ return true
+ }
+ // The code is asking for the address of an external
+ // function. We provide it with the address of the
+ // correspondent GOT symbol.
+ ld.AddGotSym(target, ldr, syms, targ, uint32(elf.R_X86_64_GLOB_DAT))
+
+ su.SetRelocSym(rIdx, syms.GOT)
+ su.SetRelocAdd(rIdx, r.Add()+int64(ldr.SymGot(targ)))
+ return true
+ }
+
+ // Process dynamic relocations for the data sections.
+ if target.IsPIE() && target.IsInternal() {
+ // When internally linking, generate dynamic relocations
+ // for all typical R_ADDR relocations. The exception
+ // are those R_ADDR that are created as part of generating
+ // the dynamic relocations and must be resolved statically.
+ //
+ // There are three phases relevant to understanding this:
+ //
+ // dodata() // we are here
+ // address() // symbol address assignment
+ // reloc() // resolution of static R_ADDR relocs
+ //
+ // At this point symbol addresses have not been
+ // assigned yet (as the final size of the .rela section
+ // will affect the addresses), and so we cannot write
+ // the Elf64_Rela.r_offset now. Instead we delay it
+ // until after the 'address' phase of the linker is
+ // complete. We do this via Addaddrplus, which creates
+ // a new R_ADDR relocation which will be resolved in
+ // the 'reloc' phase.
+ //
+ // These synthetic static R_ADDR relocs must be skipped
+ // now, or else we will be caught in an infinite loop
+ // of generating synthetic relocs for our synthetic
+ // relocs.
+ //
+ // Furthermore, the rela sections contain dynamic
+ // relocations with R_ADDR relocations on
+ // Elf64_Rela.r_offset. This field should contain the
+ // symbol offset as determined by reloc(), not the
+ // final dynamically linked address as a dynamic
+ // relocation would provide.
+ switch ldr.SymName(s) {
+ case ".dynsym", ".rela", ".rela.plt", ".got.plt", ".dynamic":
+ return false
+ }
+ } else {
+ // Either internally linking a static executable,
+ // in which case we can resolve these relocations
+ // statically in the 'reloc' phase, or externally
+ // linking, in which case the relocation will be
+ // prepared in the 'reloc' phase and passed to the
+ // external linker in the 'asmb' phase.
+ if ldr.SymType(s) != sym.SDATA && ldr.SymType(s) != sym.SRODATA {
+ break
+ }
+ }
+
+ if target.IsElf() {
+ // Generate R_X86_64_RELATIVE relocations for best
+ // efficiency in the dynamic linker.
+ //
+ // As noted above, symbol addresses have not been
+ // assigned yet, so we can't generate the final reloc
+ // entry yet. We ultimately want:
+ //
+ // r_offset = s + r.Off
+ // r_info = R_X86_64_RELATIVE
+ // r_addend = targ + r.Add
+ //
+ // The dynamic linker will set *offset = base address +
+ // addend.
+ //
+ // AddAddrPlus is used for r_offset and r_addend to
+ // generate new R_ADDR relocations that will update
+ // these fields in the 'reloc' phase.
+ rela := ldr.MakeSymbolUpdater(syms.Rela)
+ rela.AddAddrPlus(target.Arch, s, int64(r.Off()))
+ if r.Siz() == 8 {
+ rela.AddUint64(target.Arch, elf.R_INFO(0, uint32(elf.R_X86_64_RELATIVE)))
+ } else {
+ ldr.Errorf(s, "unexpected relocation for dynamic symbol %s", ldr.SymName(targ))
+ }
+ rela.AddAddrPlus(target.Arch, targ, int64(r.Add()))
+ // Not mark r done here. So we still apply it statically,
+ // so in the file content we'll also have the right offset
+ // to the relocation target. So it can be examined statically
+ // (e.g. go version).
+ return true
+ }
+
+ if target.IsDarwin() {
+ // Mach-O relocations are a royal pain to lay out.
+ // They use a compact stateful bytecode representation.
+ // Here we record what are needed and encode them later.
+ ld.MachoAddRebase(s, int64(r.Off()))
+ // Not mark r done here. So we still apply it statically,
+ // so in the file content we'll also have the right offset
+ // to the relocation target. So it can be examined statically
+ // (e.g. go version).
+ return true
+ }
+ }
+
+ return false
+}
+
+func elfreloc1(ctxt *ld.Link, out *ld.OutBuf, ldr *loader.Loader, s loader.Sym, r loader.ExtReloc, ri int, sectoff int64) bool {
+ out.Write64(uint64(sectoff))
+
+ elfsym := ld.ElfSymForReloc(ctxt, r.Xsym)
+ siz := r.Size
+ switch r.Type {
+ default:
+ return false
+ case objabi.R_ADDR, objabi.R_DWARFSECREF:
+ if siz == 4 {
+ out.Write64(uint64(elf.R_X86_64_32) | uint64(elfsym)<<32)
+ } else if siz == 8 {
+ out.Write64(uint64(elf.R_X86_64_64) | uint64(elfsym)<<32)
+ } else {
+ return false
+ }
+ case objabi.R_TLS_LE:
+ if siz == 4 {
+ out.Write64(uint64(elf.R_X86_64_TPOFF32) | uint64(elfsym)<<32)
+ } else {
+ return false
+ }
+ case objabi.R_TLS_IE:
+ if siz == 4 {
+ out.Write64(uint64(elf.R_X86_64_GOTTPOFF) | uint64(elfsym)<<32)
+ } else {
+ return false
+ }
+ case objabi.R_CALL:
+ if siz == 4 {
+ if ldr.SymType(r.Xsym) == sym.SDYNIMPORT {
+ out.Write64(uint64(elf.R_X86_64_PLT32) | uint64(elfsym)<<32)
+ } else {
+ out.Write64(uint64(elf.R_X86_64_PC32) | uint64(elfsym)<<32)
+ }
+ } else {
+ return false
+ }
+ case objabi.R_PCREL:
+ if siz == 4 {
+ if ldr.SymType(r.Xsym) == sym.SDYNIMPORT && ldr.SymElfType(r.Xsym) == elf.STT_FUNC {
+ out.Write64(uint64(elf.R_X86_64_PLT32) | uint64(elfsym)<<32)
+ } else {
+ out.Write64(uint64(elf.R_X86_64_PC32) | uint64(elfsym)<<32)
+ }
+ } else {
+ return false
+ }
+ case objabi.R_GOTPCREL:
+ if siz == 4 {
+ out.Write64(uint64(elf.R_X86_64_GOTPCREL) | uint64(elfsym)<<32)
+ } else {
+ return false
+ }
+ }
+
+ out.Write64(uint64(r.Xadd))
+ return true
+}
+
+func machoreloc1(arch *sys.Arch, out *ld.OutBuf, ldr *loader.Loader, s loader.Sym, r loader.ExtReloc, sectoff int64) bool {
+ var v uint32
+
+ rs := r.Xsym
+ rt := r.Type
+
+ if ldr.SymType(rs) == sym.SHOSTOBJ || rt == objabi.R_PCREL || rt == objabi.R_GOTPCREL || rt == objabi.R_CALL {
+ if ldr.SymDynid(rs) < 0 {
+ ldr.Errorf(s, "reloc %d (%s) to non-macho symbol %s type=%d (%s)", rt, sym.RelocName(arch, rt), ldr.SymName(rs), ldr.SymType(rs), ldr.SymType(rs))
+ return false
+ }
+
+ v = uint32(ldr.SymDynid(rs))
+ v |= 1 << 27 // external relocation
+ } else {
+ v = uint32(ldr.SymSect(rs).Extnum)
+ if v == 0 {
+ ldr.Errorf(s, "reloc %d (%s) to symbol %s in non-macho section %s type=%d (%s)", rt, sym.RelocName(arch, rt), ldr.SymName(rs), ldr.SymSect(rs).Name, ldr.SymType(rs), ldr.SymType(rs))
+ return false
+ }
+ }
+
+ switch rt {
+ default:
+ return false
+
+ case objabi.R_ADDR:
+ v |= ld.MACHO_X86_64_RELOC_UNSIGNED << 28
+
+ case objabi.R_CALL:
+ v |= 1 << 24 // pc-relative bit
+ v |= ld.MACHO_X86_64_RELOC_BRANCH << 28
+
+ // NOTE: Only works with 'external' relocation. Forced above.
+ case objabi.R_PCREL:
+ v |= 1 << 24 // pc-relative bit
+ v |= ld.MACHO_X86_64_RELOC_SIGNED << 28
+ case objabi.R_GOTPCREL:
+ v |= 1 << 24 // pc-relative bit
+ v |= ld.MACHO_X86_64_RELOC_GOT_LOAD << 28
+ }
+
+ switch r.Size {
+ default:
+ return false
+
+ case 1:
+ v |= 0 << 25
+
+ case 2:
+ v |= 1 << 25
+
+ case 4:
+ v |= 2 << 25
+
+ case 8:
+ v |= 3 << 25
+ }
+
+ out.Write32(uint32(sectoff))
+ out.Write32(v)
+ return true
+}
+
+func pereloc1(arch *sys.Arch, out *ld.OutBuf, ldr *loader.Loader, s loader.Sym, r loader.ExtReloc, sectoff int64) bool {
+ var v uint32
+
+ rs := r.Xsym
+ rt := r.Type
+
+ if ldr.SymDynid(rs) < 0 {
+ ldr.Errorf(s, "reloc %d (%s) to non-coff symbol %s type=%d (%s)", rt, sym.RelocName(arch, rt), ldr.SymName(rs), ldr.SymType(rs), ldr.SymType(rs))
+ return false
+ }
+
+ out.Write32(uint32(sectoff))
+ out.Write32(uint32(ldr.SymDynid(rs)))
+
+ switch rt {
+ default:
+ return false
+
+ case objabi.R_DWARFSECREF:
+ v = ld.IMAGE_REL_AMD64_SECREL
+
+ case objabi.R_ADDR:
+ if r.Size == 8 {
+ v = ld.IMAGE_REL_AMD64_ADDR64
+ } else {
+ v = ld.IMAGE_REL_AMD64_ADDR32
+ }
+
+ case objabi.R_CALL,
+ objabi.R_PCREL:
+ v = ld.IMAGE_REL_AMD64_REL32
+ }
+
+ out.Write16(uint16(v))
+
+ return true
+}
+
+func archreloc(*ld.Target, *loader.Loader, *ld.ArchSyms, loader.Reloc, loader.Sym, int64) (int64, int, bool) {
+ return -1, 0, false
+}
+
+func archrelocvariant(*ld.Target, *loader.Loader, loader.Reloc, sym.RelocVariant, loader.Sym, int64) int64 {
+ log.Fatalf("unexpected relocation variant")
+ return -1
+}
+
+func elfsetupplt(ctxt *ld.Link, plt, got *loader.SymbolBuilder, dynamic loader.Sym) {
+ if plt.Size() == 0 {
+ // pushq got+8(IP)
+ plt.AddUint8(0xff)
+
+ plt.AddUint8(0x35)
+ plt.AddPCRelPlus(ctxt.Arch, got.Sym(), 8)
+
+ // jmpq got+16(IP)
+ plt.AddUint8(0xff)
+
+ plt.AddUint8(0x25)
+ plt.AddPCRelPlus(ctxt.Arch, got.Sym(), 16)
+
+ // nopl 0(AX)
+ plt.AddUint32(ctxt.Arch, 0x00401f0f)
+
+ // assume got->size == 0 too
+ got.AddAddrPlus(ctxt.Arch, dynamic, 0)
+
+ got.AddUint64(ctxt.Arch, 0)
+ got.AddUint64(ctxt.Arch, 0)
+ }
+}
+
+func addpltsym(target *ld.Target, ldr *loader.Loader, syms *ld.ArchSyms, s loader.Sym) {
+ if ldr.SymPlt(s) >= 0 {
+ return
+ }
+
+ ld.Adddynsym(ldr, target, syms, s)
+
+ if target.IsElf() {
+ plt := ldr.MakeSymbolUpdater(syms.PLT)
+ got := ldr.MakeSymbolUpdater(syms.GOTPLT)
+ rela := ldr.MakeSymbolUpdater(syms.RelaPLT)
+ if plt.Size() == 0 {
+ panic("plt is not set up")
+ }
+
+ // jmpq *got+size(IP)
+ plt.AddUint8(0xff)
+
+ plt.AddUint8(0x25)
+ plt.AddPCRelPlus(target.Arch, got.Sym(), got.Size())
+
+ // add to got: pointer to current pos in plt
+ got.AddAddrPlus(target.Arch, plt.Sym(), plt.Size())
+
+ // pushq $x
+ plt.AddUint8(0x68)
+
+ plt.AddUint32(target.Arch, uint32((got.Size()-24-8)/8))
+
+ // jmpq .plt
+ plt.AddUint8(0xe9)
+
+ plt.AddUint32(target.Arch, uint32(-(plt.Size() + 4)))
+
+ // rela
+ rela.AddAddrPlus(target.Arch, got.Sym(), got.Size()-8)
+
+ sDynid := ldr.SymDynid(s)
+ rela.AddUint64(target.Arch, elf.R_INFO(uint32(sDynid), uint32(elf.R_X86_64_JMP_SLOT)))
+ rela.AddUint64(target.Arch, 0)
+
+ ldr.SetPlt(s, int32(plt.Size()-16))
+ } else if target.IsDarwin() {
+ ld.AddGotSym(target, ldr, syms, s, 0)
+
+ sDynid := ldr.SymDynid(s)
+ lep := ldr.MakeSymbolUpdater(syms.LinkEditPLT)
+ lep.AddUint32(target.Arch, uint32(sDynid))
+
+ plt := ldr.MakeSymbolUpdater(syms.PLT)
+ ldr.SetPlt(s, int32(plt.Size()))
+
+ // jmpq *got+size(IP)
+ plt.AddUint8(0xff)
+ plt.AddUint8(0x25)
+ plt.AddPCRelPlus(target.Arch, syms.GOT, int64(ldr.SymGot(s)))
+ } else {
+ ldr.Errorf(s, "addpltsym: unsupported binary format")
+ }
+}
+
+func tlsIEtoLE(P []byte, off, size int) {
+ // Transform the PC-relative instruction into a constant load.
+ // That is,
+ //
+ // MOVQ X(IP), REG -> MOVQ $Y, REG
+ //
+ // To determine the instruction and register, we study the op codes.
+ // Consult an AMD64 instruction encoding guide to decipher this.
+ if off < 3 {
+ log.Fatal("R_X86_64_GOTTPOFF reloc not preceded by MOVQ or ADDQ instruction")
+ }
+ op := P[off-3 : off]
+ reg := op[2] >> 3
+
+ if op[1] == 0x8b || reg == 4 {
+ // MOVQ
+ if op[0] == 0x4c {
+ op[0] = 0x49
+ } else if size == 4 && op[0] == 0x44 {
+ op[0] = 0x41
+ }
+ if op[1] == 0x8b {
+ op[1] = 0xc7
+ } else {
+ op[1] = 0x81 // special case for SP
+ }
+ op[2] = 0xc0 | reg
+ } else {
+ // An alternate op is ADDQ. This is handled by GNU gold,
+ // but right now is not generated by the Go compiler:
+ // ADDQ X(IP), REG -> ADDQ $Y, REG
+ // Consider adding support for it here.
+ log.Fatalf("expected TLS IE op to be MOVQ, got %v", op)
+ }
+}
diff --git a/src/cmd/link/internal/amd64/l.go b/src/cmd/link/internal/amd64/l.go
new file mode 100644
index 0000000..c9ea90a
--- /dev/null
+++ b/src/cmd/link/internal/amd64/l.go
@@ -0,0 +1,43 @@
+// Inferno utils/6l/l.h
+// https://bitbucket.org/inferno-os/inferno-os/src/master/utils/6l/l.h
+//
+// Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
+// Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net)
+// Portions Copyright © 1997-1999 Vita Nuova Limited
+// Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com)
+// Portions Copyright © 2004,2006 Bruce Ellis
+// Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net)
+// Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others
+// Portions Copyright © 2009 The Go Authors. All rights reserved.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+package amd64
+
+const (
+ maxAlign = 32 // max data alignment
+ minAlign = 1 // min data alignment
+ funcAlign = 32
+)
+
+/* Used by ../internal/ld/dwarf.go */
+const (
+ dwarfRegSP = 7
+ dwarfRegLR = 16
+)
diff --git a/src/cmd/link/internal/amd64/obj.go b/src/cmd/link/internal/amd64/obj.go
new file mode 100644
index 0000000..d09c90e
--- /dev/null
+++ b/src/cmd/link/internal/amd64/obj.go
@@ -0,0 +1,122 @@
+// Inferno utils/6l/obj.c
+// https://bitbucket.org/inferno-os/inferno-os/src/master/utils/6l/obj.c
+//
+// Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
+// Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net)
+// Portions Copyright © 1997-1999 Vita Nuova Limited
+// Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com)
+// Portions Copyright © 2004,2006 Bruce Ellis
+// Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net)
+// Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others
+// Portions Copyright © 2009 The Go Authors. All rights reserved.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+package amd64
+
+import (
+ "cmd/internal/objabi"
+ "cmd/internal/sys"
+ "cmd/link/internal/ld"
+)
+
+func Init() (*sys.Arch, ld.Arch) {
+ arch := sys.ArchAMD64
+
+ theArch := ld.Arch{
+ Funcalign: funcAlign,
+ Maxalign: maxAlign,
+ Minalign: minAlign,
+ Dwarfregsp: dwarfRegSP,
+ Dwarfreglr: dwarfRegLR,
+ // 0xCC is INT $3 - breakpoint instruction
+ CodePad: []byte{0xCC},
+
+ Plan9Magic: uint32(4*26*26 + 7),
+ Plan9_64Bit: true,
+
+ Adddynrel: adddynrel,
+ Archinit: archinit,
+ Archreloc: archreloc,
+ Archrelocvariant: archrelocvariant,
+ Elfreloc1: elfreloc1,
+ ElfrelocSize: 24,
+ Elfsetupplt: elfsetupplt,
+ Gentext: gentext,
+ Machoreloc1: machoreloc1,
+ MachorelocSize: 8,
+ PEreloc1: pereloc1,
+ TLSIEtoLE: tlsIEtoLE,
+
+ Linuxdynld: "/lib64/ld-linux-x86-64.so.2",
+ Freebsddynld: "/libexec/ld-elf.so.1",
+ Openbsddynld: "/usr/libexec/ld.so",
+ Netbsddynld: "/libexec/ld.elf_so",
+ Dragonflydynld: "/usr/libexec/ld-elf.so.2",
+ Solarisdynld: "/lib/amd64/ld.so.1",
+ }
+
+ return arch, theArch
+}
+
+func archinit(ctxt *ld.Link) {
+ switch ctxt.HeadType {
+ default:
+ ld.Exitf("unknown -H option: %v", ctxt.HeadType)
+
+ case objabi.Hplan9: /* plan 9 */
+ ld.HEADR = 32 + 8
+
+ if *ld.FlagTextAddr == -1 {
+ *ld.FlagTextAddr = 0x200000 + int64(ld.HEADR)
+ }
+ if *ld.FlagRound == -1 {
+ *ld.FlagRound = 0x200000
+ }
+
+ case objabi.Hdarwin: /* apple MACH */
+ ld.HEADR = ld.INITIAL_MACHO_HEADR
+ if *ld.FlagRound == -1 {
+ *ld.FlagRound = 4096
+ }
+ if *ld.FlagTextAddr == -1 {
+ *ld.FlagTextAddr = 0x1000000 + int64(ld.HEADR)
+ }
+
+ case objabi.Hlinux, /* elf64 executable */
+ objabi.Hfreebsd, /* freebsd */
+ objabi.Hnetbsd, /* netbsd */
+ objabi.Hopenbsd, /* openbsd */
+ objabi.Hdragonfly, /* dragonfly */
+ objabi.Hsolaris: /* solaris */
+ ld.Elfinit(ctxt)
+
+ ld.HEADR = ld.ELFRESERVE
+ if *ld.FlagTextAddr == -1 {
+ *ld.FlagTextAddr = (1 << 22) + int64(ld.HEADR)
+ }
+ if *ld.FlagRound == -1 {
+ *ld.FlagRound = 4096
+ }
+
+ case objabi.Hwindows: /* PE executable */
+ // ld.HEADR, ld.FlagTextAddr, ld.FlagRound are set in ld.Peinit
+ return
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-15 13:18:40 +0000