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cmd/link: introduce and use peSection.emitRelocations

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Change-Id: I2bebee5566ee07786695f147c27661e69337a0f7
Reviewed-on: https://go-review.googlesource.com/59418
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Alex Brainman 2017-08-28 13:04:27 +10:00
parent 88a1e85c70
commit 04d410d6cd
1 changed files with 31 additions and 31 deletions
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62
src/cmd/link/internal/ld/pe.go
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@ -439,6 +439,32 @@ func (sect *peSection) write() error {
return binary.Write(&coutbuf, binary.LittleEndian, h) return binary.Write(&coutbuf, binary.LittleEndian, h)
} }
// emitRelocations emits the relocation entries for the sect.
// The actual relocations are emitted by relocfn.
// This updates the corresponding PE section table entry
// with the relocation offset and count.
func (sect *peSection) emitRelocations(relocfn func() int) {
sect.PointerToRelocations = uint32(coutbuf.Offset())
// first entry: extended relocs
Lputl(0) // placeholder for number of relocation + 1
Lputl(0)
Wputl(0)
n := relocfn() + 1
cpos := coutbuf.Offset()
Cseek(int64(sect.PointerToRelocations))
Lputl(uint32(n))
Cseek(cpos)
if n > 0x10000 {
n = 0x10000
sect.Characteristics |= IMAGE_SCN_LNK_NRELOC_OVFL
} else {
sect.PointerToRelocations += 10 // skip the extend reloc entry
}
sect.NumberOfRelocations = uint16(n - 1)
}
// peFile is used to build COFF file. // peFile is used to build COFF file.
type peFile struct { type peFile struct {
sections []*peSection sections []*peSection
@ -950,39 +976,13 @@ func perelocsect(ctxt *Link, sect *Section, syms []*Symbol, base uint64) int {
return relocs return relocs
} }
// peemitsectreloc emits the relocation entries for sect.
// The actual relocations are emitted by relocfn.
// This updates the corresponding PE section table entry
// with the relocation offset and count.
func peemitsectreloc(sect *peSection, relocfn func() int) {
sect.PointerToRelocations = uint32(coutbuf.Offset())
// first entry: extended relocs
Lputl(0) // placeholder for number of relocation + 1
Lputl(0)
Wputl(0)
n := relocfn() + 1
cpos := coutbuf.Offset()
Cseek(int64(sect.PointerToRelocations))
Lputl(uint32(n))
Cseek(cpos)
if n > 0x10000 {
n = 0x10000
sect.Characteristics |= IMAGE_SCN_LNK_NRELOC_OVFL
} else {
sect.PointerToRelocations += 10 // skip the extend reloc entry
}
sect.NumberOfRelocations = uint16(n - 1)
}
// peemitreloc emits relocation entries for go.o in external linking. // peemitreloc emits relocation entries for go.o in external linking.
func peemitreloc(ctxt *Link, text, data, ctors *peSection) { func peemitreloc(ctxt *Link, text, data, ctors *peSection) {
for coutbuf.Offset()&7 != 0 { for coutbuf.Offset()&7 != 0 {
Cput(0) Cput(0)
} }
peemitsectreloc(text, func() int { text.emitRelocations(func() int {
n := perelocsect(ctxt, Segtext.Sections[0], ctxt.Textp, Segtext.Vaddr) n := perelocsect(ctxt, Segtext.Sections[0], ctxt.Textp, Segtext.Vaddr)
for _, sect := range Segtext.Sections[1:] { for _, sect := range Segtext.Sections[1:] {
n += perelocsect(ctxt, sect, datap, Segtext.Vaddr) n += perelocsect(ctxt, sect, datap, Segtext.Vaddr)
@ -990,7 +990,7 @@ func peemitreloc(ctxt *Link, text, data, ctors *peSection) {
return n return n
}) })
peemitsectreloc(data, func() int { data.emitRelocations(func() int {
var n int var n int
for _, sect := range Segdata.Sections { for _, sect := range Segdata.Sections {
n += perelocsect(ctxt, sect, datap, Segdata.Vaddr) n += perelocsect(ctxt, sect, datap, Segdata.Vaddr)
@ -1002,16 +1002,16 @@ dwarfLoop:
for _, sect := range Segdwarf.Sections { for _, sect := range Segdwarf.Sections {
for _, pesect := range pefile.sections { for _, pesect := range pefile.sections {
if sect.Name == pesect.name { if sect.Name == pesect.name {
peemitsectreloc(pesect, func() int { pesect.emitRelocations(func() int {
return perelocsect(ctxt, sect, dwarfp, sect.Vaddr) return perelocsect(ctxt, sect, dwarfp, sect.Vaddr)
}) })
continue dwarfLoop continue dwarfLoop
} }
} }
Errorf(nil, "peemitsectreloc: could not find %q section", sect.Name) Errorf(nil, "peemitreloc: could not find %q section", sect.Name)
} }
peemitsectreloc(ctors, func() int { ctors.emitRelocations(func() int {
dottext := ctxt.Syms.Lookup(".text", 0) dottext := ctxt.Syms.Lookup(".text", 0)
Lputl(0) Lputl(0)
Lputl(uint32(dottext.Dynid)) Lputl(uint32(dottext.Dynid))