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// 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
import "cmd/internal/objabi"
// 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_8BIT_COUNTER
SCOVERAGE_COUNTER
SCOVERAGE_AUXVAR
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
)
// AbiSymKindToSymKind maps values read from object files (which are
// of type cmd/internal/objabi.SymKind) to values of type SymKind.
var AbiSymKindToSymKind = [...]SymKind{
objabi.Sxxx: Sxxx,
objabi.STEXT: STEXT,
objabi.SRODATA: SRODATA,
objabi.SNOPTRDATA: SNOPTRDATA,
objabi.SDATA: SDATA,
objabi.SBSS: SBSS,
objabi.SNOPTRBSS: SNOPTRBSS,
objabi.STLSBSS: STLSBSS,
objabi.SDWARFCUINFO: SDWARFCUINFO,
objabi.SDWARFCONST: SDWARFCONST,
objabi.SDWARFFCN: SDWARFFCN,
objabi.SDWARFABSFCN: SDWARFABSFCN,
objabi.SDWARFTYPE: SDWARFTYPE,
objabi.SDWARFVAR: SDWARFVAR,
objabi.SDWARFRANGE: SDWARFRANGE,
objabi.SDWARFLOC: SDWARFLOC,
objabi.SDWARFLINES: SDWARFLINES,
objabi.SLIBFUZZER_8BIT_COUNTER: SLIBFUZZER_8BIT_COUNTER,
objabi.SCOVERAGE_COUNTER: SCOVERAGE_COUNTER,
objabi.SCOVERAGE_AUXVAR: SCOVERAGE_AUXVAR,
}
// 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
}
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