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Diffstat (limited to 'src/cmd/link/internal/sym/symkind.go')
| -rw-r--r-- | src/cmd/link/internal/sym/symkind.go | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/src/cmd/link/internal/sym/symkind.go b/src/cmd/link/internal/sym/symkind.go new file mode 100644 index 0000000..c176d5e --- /dev/null +++ b/src/cmd/link/internal/sym/symkind.go @@ -0,0 +1,178 @@ +// Derived from Inferno utils/6l/l.h and related files. +// 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 sym + +// A SymKind describes the kind of memory represented by a symbol. +type SymKind uint8 + +// Defined SymKind values. +// +// TODO(rsc): Give idiomatic Go names. +//go:generate stringer -type=SymKind +const ( + Sxxx SymKind = iota + STEXT + SELFRXSECT + SMACHOPLT + + // Read-only sections. + STYPE + SSTRING + SGOSTRING + SGOFUNC + SGCBITS + SRODATA + SFUNCTAB + + SELFROSECT + + // Read-only sections with relocations. + // + // Types STYPE-SFUNCTAB above are written to the .rodata section by default. + // When linking a shared object, some conceptually "read only" types need to + // be written to by relocations and putting them in a section called + // ".rodata" interacts poorly with the system linkers. The GNU linkers + // support this situation by arranging for sections of the name + // ".data.rel.ro.XXX" to be mprotected read only by the dynamic linker after + // relocations have applied, so when the Go linker is creating a shared + // object it checks all objects of the above types and bumps any object that + // has a relocation to it to the corresponding type below, which are then + // written to sections with appropriate magic names. + STYPERELRO + SSTRINGRELRO + SGOSTRINGRELRO + SGOFUNCRELRO + SGCBITSRELRO + SRODATARELRO + SFUNCTABRELRO + + // Part of .data.rel.ro if it exists, otherwise part of .rodata. + STYPELINK + SITABLINK + SSYMTAB + SPCLNTAB + + // Writable sections. + SFirstWritable + SBUILDINFO + SELFSECT + SMACHO + SMACHOGOT + SWINDOWS + SELFGOT + SNOPTRDATA + SINITARR + SDATA + SXCOFFTOC + SBSS + SNOPTRBSS + SLIBFUZZER_EXTRA_COUNTER + STLSBSS + SXREF + SMACHOSYMSTR + SMACHOSYMTAB + SMACHOINDIRECTPLT + SMACHOINDIRECTGOT + SFILEPATH + SDYNIMPORT + SHOSTOBJ + SUNDEFEXT // Undefined symbol for resolution by external linker + + // Sections for debugging information + SDWARFSECT + // DWARF symbol types + SDWARFCUINFO + SDWARFCONST + SDWARFFCN + SDWARFABSFCN + SDWARFTYPE + SDWARFVAR + SDWARFRANGE + SDWARFLOC + SDWARFLINES + + // ABI aliases (these never appear in the output) + SABIALIAS +) + +// AbiSymKindToSymKind maps values read from object files (which are +// of type cmd/internal/objabi.SymKind) to values of type SymKind. +var AbiSymKindToSymKind = [...]SymKind{ + Sxxx, + STEXT, + SRODATA, + SNOPTRDATA, + SDATA, + SBSS, + SNOPTRBSS, + STLSBSS, + SDWARFCUINFO, + SDWARFCONST, + SDWARFFCN, + SDWARFABSFCN, + SDWARFTYPE, + SDWARFVAR, + SDWARFRANGE, + SDWARFLOC, + SDWARFLINES, + SABIALIAS, + SLIBFUZZER_EXTRA_COUNTER, +} + +// ReadOnly are the symbol kinds that form read-only sections. In some +// cases, if they will require relocations, they are transformed into +// rel-ro sections using relROMap. +var ReadOnly = []SymKind{ + STYPE, + SSTRING, + SGOSTRING, + SGOFUNC, + SGCBITS, + SRODATA, + SFUNCTAB, +} + +// RelROMap describes the transformation of read-only symbols to rel-ro +// symbols. +var RelROMap = map[SymKind]SymKind{ + STYPE: STYPERELRO, + SSTRING: SSTRINGRELRO, + SGOSTRING: SGOSTRINGRELRO, + SGOFUNC: SGOFUNCRELRO, + SGCBITS: SGCBITSRELRO, + SRODATA: SRODATARELRO, + SFUNCTAB: SFUNCTABRELRO, +} + +// IsData returns true if the type is a data type. +func (t SymKind) IsData() bool { + return t == SDATA || t == SNOPTRDATA || t == SBSS || t == SNOPTRBSS +} |