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go/src/cmd/link/internal/x86/asm.go
Cherry Zhang dd34841de7 [dev.link] cmd/link: write data sections to heap in Asmb on Wasm 
Make Wasm more like other architectures, writing data sections to
heap in Asmb instead of Asmb2. Then we can remove the
copy-on-write logic in applying relocations.

Change-Id: I26d5315ea9fba032fe4bdb9b5c7fe483611c4373
Reviewed-on: https://go-review.googlesource.com/c/go/+/230465
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
2020-04-28 18:36:45 +00:00

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// Inferno utils/8l/asm.c
// https://bitbucket.org/inferno-os/inferno-os/src/default/utils/8l/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 x86
import (
"cmd/internal/objabi"
"cmd/internal/sys"
"cmd/link/internal/ld"
"cmd/link/internal/loader"
"cmd/link/internal/sym"
"debug/elf"
"log"
"sync"
)
func gentext2(ctxt *ld.Link, ldr *loader.Loader) {
if ctxt.DynlinkingGo() {
// We need get_pc_thunk.
} else {
switch ctxt.BuildMode {
case ld.BuildModeCArchive:
if !ctxt.IsELF {
return
}
case ld.BuildModePIE, ld.BuildModeCShared, ld.BuildModePlugin:
// We need get_pc_thunk.
default:
return
}
}
// Generate little thunks that load the PC of the next instruction into a register.
thunks := make([]loader.Sym, 0, 7+len(ctxt.Textp2))
for _, r := range [...]struct {
name string
num uint8
}{
{"ax", 0},
{"cx", 1},
{"dx", 2},
{"bx", 3},
// sp
{"bp", 5},
{"si", 6},
{"di", 7},
} {
thunkfunc := ldr.CreateSymForUpdate("__x86.get_pc_thunk."+r.name, 0)
thunkfunc.SetType(sym.STEXT)
ldr.SetAttrLocal(thunkfunc.Sym(), true)
o := func(op ...uint8) {
for _, op1 := range op {
thunkfunc.AddUint8(op1)
}
}
// 8b 04 24 mov (%esp),%eax
// Destination register is in bits 3-5 of the middle byte, so add that in.
o(0x8b, 0x04+r.num<<3, 0x24)
// c3 ret
o(0xc3)
thunks = append(thunks, thunkfunc.Sym())
}
ctxt.Textp2 = append(thunks, ctxt.Textp2...) // keep Textp2 in dependency order
initfunc, addmoduledata := ld.PrepareAddmoduledata(ctxt)
if initfunc == nil {
return
}
o := func(op ...uint8) {
for _, op1 := range op {
initfunc.AddUint8(op1)
}
}
// go.link.addmoduledata:
// 53 push %ebx
// e8 00 00 00 00 call __x86.get_pc_thunk.cx + R_CALL __x86.get_pc_thunk.cx
// 8d 81 00 00 00 00 lea 0x0(%ecx), %eax + R_PCREL ctxt.Moduledata
// 8d 99 00 00 00 00 lea 0x0(%ecx), %ebx + R_GOTPC _GLOBAL_OFFSET_TABLE_
// e8 00 00 00 00 call runtime.addmoduledata@plt + R_CALL runtime.addmoduledata
// 5b pop %ebx
// c3 ret
o(0x53)
o(0xe8)
initfunc.AddSymRef(ctxt.Arch, ldr.Lookup("__x86.get_pc_thunk.cx", 0), 0, objabi.R_CALL, 4)
o(0x8d, 0x81)
initfunc.AddPCRelPlus(ctxt.Arch, ctxt.Moduledata2, 6)
o(0x8d, 0x99)
gotsym := ldr.LookupOrCreateSym("_GLOBAL_OFFSET_TABLE_", 0)
initfunc.AddSymRef(ctxt.Arch, gotsym, 12, objabi.R_PCREL, 4)
o(0xe8)
initfunc.AddSymRef(ctxt.Arch, addmoduledata, 0, objabi.R_CALL, 4)
o(0x5b)
o(0xc3)
}
func adddynrel2(target *ld.Target, ldr *loader.Loader, syms *ld.ArchSyms, s loader.Sym, r *loader.Reloc2, rIdx int) bool {
targ := r.Sym()
var targType sym.SymKind
if targ != 0 {
targType = ldr.SymType(targ)
}
switch r.Type() {
default:
if r.Type() >= 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_386_PC32):
if targType == sym.SDYNIMPORT {
ldr.Errorf(s, "unexpected R_386_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_386_PLT32):
su := ldr.MakeSymbolUpdater(s)
su.SetRelocType(rIdx, objabi.R_PCREL)
su.SetRelocAdd(rIdx, r.Add()+4)
if targType == sym.SDYNIMPORT {
addpltsym2(target, ldr, syms, targ)
su.SetRelocSym(rIdx, syms.PLT2)
su.SetRelocAdd(rIdx, r.Add()+int64(ldr.SymPlt(targ)))
}
return true
case objabi.ElfRelocOffset + objabi.RelocType(elf.R_386_GOT32),
objabi.ElfRelocOffset + objabi.RelocType(elf.R_386_GOT32X):
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 MOVL of GOT entry into LEAL of symbol address, relative to GOT.
writeableData := su.Data()
writeableData[r.Off()-2] = 0x8d
su.SetRelocType(rIdx, objabi.R_GOTOFF)
return true
}
if r.Off() >= 2 && sData[r.Off()-2] == 0xff && sData[r.Off()-1] == 0xb3 {
su.MakeWritable()
// turn PUSHL of GOT entry into PUSHL of symbol itself.
// use unnecessary SS prefix to keep instruction same length.
writeableData := su.Data()
writeableData[r.Off()-2] = 0x36
writeableData[r.Off()-1] = 0x68
su.SetRelocType(rIdx, objabi.R_ADDR)
return true
}
ldr.Errorf(s, "unexpected GOT reloc for non-dynamic symbol %s", ldr.SymName(targ))
return false
}
addgotsym2(target, ldr, syms, targ)
su.SetRelocType(rIdx, objabi.R_CONST) // write r->add during relocsym
su.SetRelocSym(rIdx, 0)
su.SetRelocAdd(rIdx, r.Add()+int64(ldr.SymGot(targ)))
return true
case objabi.ElfRelocOffset + objabi.RelocType(elf.R_386_GOTOFF):
su := ldr.MakeSymbolUpdater(s)
su.SetRelocType(rIdx, objabi.R_GOTOFF)
return true
case objabi.ElfRelocOffset + objabi.RelocType(elf.R_386_GOTPC):
su := ldr.MakeSymbolUpdater(s)
su.SetRelocType(rIdx, objabi.R_PCREL)
su.SetRelocSym(rIdx, syms.GOT2)
su.SetRelocAdd(rIdx, r.Add()+4)
return true
case objabi.ElfRelocOffset + objabi.RelocType(elf.R_386_32):
if targType == sym.SDYNIMPORT {
ldr.Errorf(s, "unexpected R_386_32 relocation for dynamic symbol %s", ldr.SymName(targ))
}
su := ldr.MakeSymbolUpdater(s)
su.SetRelocType(rIdx, objabi.R_ADDR)
return true
case objabi.MachoRelocOffset + ld.MACHO_GENERIC_RELOC_VANILLA*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))
}
return true
case objabi.MachoRelocOffset + ld.MACHO_GENERIC_RELOC_VANILLA*2 + 1:
su := ldr.MakeSymbolUpdater(s)
if targType == sym.SDYNIMPORT {
addpltsym2(target, ldr, syms, targ)
su.SetRelocSym(rIdx, syms.PLT2)
su.SetRelocAdd(rIdx, int64(ldr.SymPlt(targ)))
su.SetRelocType(rIdx, objabi.R_PCREL)
return true
}
su.SetRelocType(rIdx, objabi.R_PCREL)
return true
case objabi.MachoRelocOffset + ld.MACHO_FAKE_GOTPCREL:
su := ldr.MakeSymbolUpdater(s)
if targType != sym.SDYNIMPORT {
// have symbol
// turn MOVL of GOT entry into LEAL of symbol itself
sData := ldr.Data(s)
if r.Off() < 2 || sData[r.Off()-2] != 0x8b {
ldr.Errorf(s, "unexpected GOT reloc for non-dynamic symbol %s", ldr.SymName(targ))
return false
}
su.MakeWritable()
writeableData := su.Data()
writeableData[r.Off()-2] = 0x8d
su.SetRelocType(rIdx, objabi.R_PCREL)
return true
}
addgotsym2(target, ldr, syms, targ)
su.SetRelocSym(rIdx, syms.GOT2)
su.SetRelocAdd(rIdx, r.Add()+int64(ldr.SymGot(targ)))
su.SetRelocType(rIdx, objabi.R_PCREL)
return true
}
// Handle references to ELF symbols from our own object files.
if targType != sym.SDYNIMPORT {
return true
}
// Reread the reloc to incorporate any changes in type above.
relocs := ldr.Relocs(s)
*r = relocs.At2(rIdx)
switch r.Type() {
case objabi.R_CALL,
objabi.R_PCREL:
if target.IsExternal() {
// External linker will do this relocation.
return true
}
addpltsym2(target, ldr, syms, targ)
su := ldr.MakeSymbolUpdater(s)
su.SetRelocSym(rIdx, syms.PLT2)
su.SetRelocAdd(rIdx, int64(ldr.SymPlt(targ)))
return true
case objabi.R_ADDR:
if ldr.SymType(s) != sym.SDATA {
break
}
if target.IsElf() {
ld.Adddynsym2(ldr, target, syms, targ)
rel := ldr.MakeSymbolUpdater(syms.Rel2)
rel.AddAddrPlus(target.Arch, s, int64(r.Off()))
rel.AddUint32(target.Arch, ld.ELF32_R_INFO(uint32(ldr.SymDynid(targ)), uint32(elf.R_386_32)))
su := ldr.MakeSymbolUpdater(s)
su.SetRelocType(rIdx, objabi.R_CONST) // write r->add during relocsym
su.SetRelocSym(rIdx, 0)
return true
}
if target.IsDarwin() && ldr.SymSize(s) == int64(target.Arch.PtrSize) && r.Off() == 0 {
// Mach-O relocations are a royal pain to lay out.
// They use a compact stateful bytecode representation
// that is too much bother to deal with.
// Instead, interpret the C declaration
// void *_Cvar_stderr = &stderr;
// as making _Cvar_stderr the name of a GOT entry
// for stderr. This is separate from the usual GOT entry,
// just in case the C code assigns to the variable,
// and of course it only works for single pointers,
// but we only need to support cgo and that's all it needs.
ld.Adddynsym2(ldr, target, syms, targ)
got := ldr.MakeSymbolUpdater(syms.GOT2)
su := ldr.MakeSymbolUpdater(s)
su.SetType(got.Type())
got.PrependSub(s)
su.SetValue(got.Size())
got.AddUint32(target.Arch, 0)
leg := ldr.MakeSymbolUpdater(syms.LinkEditGOT2)
leg.AddUint32(target.Arch, uint32(ldr.SymDynid(targ)))
su.SetRelocType(rIdx, objabi.ElfRelocOffset) // ignore during relocsym
return true
}
}
return false
}
func elfreloc1(ctxt *ld.Link, r *sym.Reloc, sectoff int64) bool {
ctxt.Out.Write32(uint32(sectoff))
elfsym := r.Xsym.ElfsymForReloc()
switch r.Type {
default:
return false
case objabi.R_ADDR:
if r.Siz == 4 {
ctxt.Out.Write32(uint32(elf.R_386_32) | uint32(elfsym)<<8)
} else {
return false
}
case objabi.R_GOTPCREL:
if r.Siz == 4 {
ctxt.Out.Write32(uint32(elf.R_386_GOTPC))
if r.Xsym.Name != "_GLOBAL_OFFSET_TABLE_" {
ctxt.Out.Write32(uint32(sectoff))
ctxt.Out.Write32(uint32(elf.R_386_GOT32) | uint32(elfsym)<<8)
}
} else {
return false
}
case objabi.R_CALL:
if r.Siz == 4 {
if r.Xsym.Type == sym.SDYNIMPORT {
ctxt.Out.Write32(uint32(elf.R_386_PLT32) | uint32(elfsym)<<8)
} else {
ctxt.Out.Write32(uint32(elf.R_386_PC32) | uint32(elfsym)<<8)
}
} else {
return false
}
case objabi.R_PCREL:
if r.Siz == 4 {
ctxt.Out.Write32(uint32(elf.R_386_PC32) | uint32(elfsym)<<8)
} else {
return false
}
case objabi.R_TLS_LE:
if r.Siz == 4 {
ctxt.Out.Write32(uint32(elf.R_386_TLS_LE) | uint32(elfsym)<<8)
} else {
return false
}
case objabi.R_TLS_IE:
if r.Siz == 4 {
ctxt.Out.Write32(uint32(elf.R_386_GOTPC))
ctxt.Out.Write32(uint32(sectoff))
ctxt.Out.Write32(uint32(elf.R_386_TLS_GOTIE) | uint32(elfsym)<<8)
} else {
return false
}
}
return true
}
func machoreloc1(arch *sys.Arch, out *ld.OutBuf, s *sym.Symbol, r *sym.Reloc, sectoff int64) bool {
return false
}
func pereloc1(arch *sys.Arch, out *ld.OutBuf, s *sym.Symbol, r *sym.Reloc, sectoff int64) bool {
var v uint32
rs := r.Xsym
if rs.Dynid < 0 {
ld.Errorf(s, "reloc %d (%s) to non-coff symbol %s type=%d (%s)", r.Type, sym.RelocName(arch, r.Type), rs.Name, rs.Type, rs.Type)
return false
}
out.Write32(uint32(sectoff))
out.Write32(uint32(rs.Dynid))
switch r.Type {
default:
return false
case objabi.R_DWARFSECREF:
v = ld.IMAGE_REL_I386_SECREL
case objabi.R_ADDR:
v = ld.IMAGE_REL_I386_DIR32
case objabi.R_CALL,
objabi.R_PCREL:
v = ld.IMAGE_REL_I386_REL32
}
out.Write16(uint16(v))
return true
}
func archreloc(target *ld.Target, syms *ld.ArchSyms, r *sym.Reloc, s *sym.Symbol, val int64) (int64, bool) {
if target.IsExternal() {
return val, false
}
switch r.Type {
case objabi.R_CONST:
return r.Add, true
case objabi.R_GOTOFF:
return ld.Symaddr(r.Sym) + r.Add - ld.Symaddr(syms.GOT), true
}
return val, false
}
func archrelocvariant(target *ld.Target, syms *ld.ArchSyms, r *sym.Reloc, s *sym.Symbol, t int64) int64 {
log.Fatalf("unexpected relocation variant")
return t
}
func elfsetupplt(ctxt *ld.Link, plt, got *loader.SymbolBuilder, dynamic loader.Sym) {
if plt.Size() == 0 {
// pushl got+4
plt.AddUint8(0xff)
plt.AddUint8(0x35)
plt.AddAddrPlus(ctxt.Arch, got.Sym(), 4)
// jmp *got+8
plt.AddUint8(0xff)
plt.AddUint8(0x25)
plt.AddAddrPlus(ctxt.Arch, got.Sym(), 8)
// zero pad
plt.AddUint32(ctxt.Arch, 0)
// assume got->size == 0 too
got.AddAddrPlus(ctxt.Arch, dynamic, 0)
got.AddUint32(ctxt.Arch, 0)
got.AddUint32(ctxt.Arch, 0)
}
}
func addpltsym2(target *ld.Target, ldr *loader.Loader, syms *ld.ArchSyms, s loader.Sym) {
if ldr.SymPlt(s) >= 0 {
return
}
ld.Adddynsym2(ldr, target, syms, s)
if target.IsElf() {
plt := ldr.MakeSymbolUpdater(syms.PLT2)
got := ldr.MakeSymbolUpdater(syms.GOTPLT2)
rel := ldr.MakeSymbolUpdater(syms.RelPLT2)
if plt.Size() == 0 {
panic("plt is not set up")
}
// jmpq *got+size
plt.AddUint8(0xff)
plt.AddUint8(0x25)
plt.AddAddrPlus(target.Arch, got.Sym(), got.Size())
// add to got: pointer to current pos in plt
got.AddAddrPlus(target.Arch, plt.Sym(), plt.Size())
// pushl $x
plt.AddUint8(0x68)
plt.AddUint32(target.Arch, uint32(rel.Size()))
// jmp .plt
plt.AddUint8(0xe9)
plt.AddUint32(target.Arch, uint32(-(plt.Size() + 4)))
// rel
rel.AddAddrPlus(target.Arch, got.Sym(), got.Size()-4)
sDynid := ldr.SymDynid(s)
rel.AddUint32(target.Arch, ld.ELF32_R_INFO(uint32(sDynid), uint32(elf.R_386_JMP_SLOT)))
ldr.SetPlt(s, int32(plt.Size()-16))
} else if target.IsDarwin() {
// Same laziness as in 6l.
plt := ldr.MakeSymbolUpdater(syms.PLT2)
addgotsym2(target, ldr, syms, s)
sDynid := ldr.SymDynid(s)
lep := ldr.MakeSymbolUpdater(syms.LinkEditPLT2)
lep.AddUint32(target.Arch, uint32(sDynid))
// jmpq *got+size(IP)
ldr.SetPlt(s, int32(plt.Size()))
plt.AddUint8(0xff)
plt.AddUint8(0x25)
plt.AddAddrPlus(target.Arch, syms.GOT2, int64(ldr.SymGot(s)))
} else {
ldr.Errorf(s, "addpltsym: unsupported binary format")
}
}
func addgotsym2(target *ld.Target, ldr *loader.Loader, syms *ld.ArchSyms, s loader.Sym) {
if ldr.SymGot(s) >= 0 {
return
}
ld.Adddynsym2(ldr, target, syms, s)
got := ldr.MakeSymbolUpdater(syms.GOT2)
ldr.SetGot(s, int32(got.Size()))
got.AddUint32(target.Arch, 0)
if target.IsElf() {
rel := ldr.MakeSymbolUpdater(syms.Rel2)
rel.AddAddrPlus(target.Arch, got.Sym(), int64(ldr.SymGot(s)))
rel.AddUint32(target.Arch, ld.ELF32_R_INFO(uint32(ldr.SymDynid(s)), uint32(elf.R_386_GLOB_DAT)))
} else if target.IsDarwin() {
leg := ldr.MakeSymbolUpdater(syms.LinkEditGOT2)
leg.AddUint32(target.Arch, uint32(ldr.SymDynid(s)))
} else {
ldr.Errorf(s, "addgotsym: unsupported binary format")
}
}
func asmb(ctxt *ld.Link, _ *loader.Loader) {
if ctxt.IsELF {
ld.Asmbelfsetup()
}
var wg sync.WaitGroup
sect := ld.Segtext.Sections[0]
offset := sect.Vaddr - ld.Segtext.Vaddr + ld.Segtext.Fileoff
f := func(ctxt *ld.Link, out *ld.OutBuf, start, length int64) {
ld.CodeblkPad(ctxt, out, start, length, []byte{0xCC})
}
ld.WriteParallel(&wg, f, ctxt, offset, sect.Vaddr, sect.Length)
for _, sect := range ld.Segtext.Sections[1:] {
offset := sect.Vaddr - ld.Segtext.Vaddr + ld.Segtext.Fileoff
ld.WriteParallel(&wg, ld.Datblk, ctxt, offset, sect.Vaddr, sect.Length)
}
if ld.Segrodata.Filelen > 0 {
ld.WriteParallel(&wg, ld.Datblk, ctxt, ld.Segrodata.Fileoff, ld.Segrodata.Vaddr, ld.Segrodata.Filelen)
}
if ld.Segrelrodata.Filelen > 0 {
ld.WriteParallel(&wg, ld.Datblk, ctxt, ld.Segrelrodata.Fileoff, ld.Segrelrodata.Vaddr, ld.Segrelrodata.Filelen)
}
ld.WriteParallel(&wg, ld.Datblk, ctxt, ld.Segdata.Fileoff, ld.Segdata.Vaddr, ld.Segdata.Filelen)
ld.WriteParallel(&wg, ld.Dwarfblk, ctxt, ld.Segdwarf.Fileoff, ld.Segdwarf.Vaddr, ld.Segdwarf.Filelen)
wg.Wait()
}
func asmb2(ctxt *ld.Link) {
machlink := uint32(0)
if ctxt.HeadType == objabi.Hdarwin {
machlink = uint32(ld.Domacholink(ctxt))
}
ld.Symsize = 0
ld.Spsize = 0
ld.Lcsize = 0
symo := uint32(0)
if !*ld.FlagS {
// TODO: rationalize
switch ctxt.HeadType {
default:
if ctxt.IsELF {
symo = uint32(ld.Segdwarf.Fileoff + ld.Segdwarf.Filelen)
symo = uint32(ld.Rnd(int64(symo), int64(*ld.FlagRound)))
}
case objabi.Hplan9:
symo = uint32(ld.Segdata.Fileoff + ld.Segdata.Filelen)
case objabi.Hdarwin:
symo = uint32(ld.Segdwarf.Fileoff + uint64(ld.Rnd(int64(ld.Segdwarf.Filelen), int64(*ld.FlagRound))) + uint64(machlink))
case objabi.Hwindows:
symo = uint32(ld.Segdwarf.Fileoff + ld.Segdwarf.Filelen)
symo = uint32(ld.Rnd(int64(symo), ld.PEFILEALIGN))
}
ctxt.Out.SeekSet(int64(symo))
switch ctxt.HeadType {
default:
if ctxt.IsELF {
ld.Asmelfsym(ctxt)
ctxt.Out.Write(ld.Elfstrdat)
if ctxt.LinkMode == ld.LinkExternal {
ld.Elfemitreloc(ctxt)
}
}
case objabi.Hplan9:
ld.Asmplan9sym(ctxt)
sym := ctxt.Syms.Lookup("pclntab", 0)
if sym != nil {
ld.Lcsize = int32(len(sym.P))
ctxt.Out.Write(sym.P)
}
case objabi.Hwindows:
// Do nothing
case objabi.Hdarwin:
if ctxt.LinkMode == ld.LinkExternal {
ld.Machoemitreloc(ctxt)
}
}
}
ctxt.Out.SeekSet(0)
switch ctxt.HeadType {
default:
case objabi.Hplan9: /* plan9 */
magic := int32(4*11*11 + 7)
ctxt.Out.Write32b(uint32(magic)) /* magic */
ctxt.Out.Write32b(uint32(ld.Segtext.Filelen)) /* sizes */
ctxt.Out.Write32b(uint32(ld.Segdata.Filelen))
ctxt.Out.Write32b(uint32(ld.Segdata.Length - ld.Segdata.Filelen))
ctxt.Out.Write32b(uint32(ld.Symsize)) /* nsyms */
ctxt.Out.Write32b(uint32(ld.Entryvalue(ctxt))) /* va of entry */
ctxt.Out.Write32b(uint32(ld.Spsize)) /* sp offsets */
ctxt.Out.Write32b(uint32(ld.Lcsize)) /* line offsets */
case objabi.Hdarwin:
ld.Asmbmacho(ctxt)
case objabi.Hlinux,
objabi.Hfreebsd,
objabi.Hnetbsd,
objabi.Hopenbsd:
ld.Asmbelf(ctxt, int64(symo))
case objabi.Hwindows:
ld.Asmbpe(ctxt)
}
}
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