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cmd/link: simplify peemitreloc

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No functional changes.

For #10776.

Change-Id: If9a5ef832af116c5802b06a38e0c050d7363f2d5
Reviewed-on: https://go-review.googlesource.com/36981
Run-TryBot: Alex Brainman <alex.brainman@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Alex Brainman 2017-02-08 12:04:11 +11:00
parent d0a978f5b5
commit b32170abdf
1 changed files with 54 additions and 58 deletions
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112
src/cmd/link/internal/ld/pe.go
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@ -854,72 +854,68 @@ func perelocsect(ctxt *Link, sect *Section, syms []*Symbol) int {
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 *IMAGE_SECTION_HEADER, 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.
func peemitreloc(ctxt *Link, text, data, ctors *IMAGE_SECTION_HEADER) {
for coutbuf.Offset()&7 != 0 {
Cput(0)
}
text.PointerToRelocations = uint32(coutbuf.Offset())
// first entry: extended relocs
Lputl(0) // placeholder for number of relocation + 1
Lputl(0)
Wputl(0)
peemitsectreloc(text, func() int {
n := perelocsect(ctxt, Segtext.Sect, ctxt.Textp)
for sect := Segtext.Sect.Next; sect != nil; sect = sect.Next {
n += perelocsect(ctxt, sect, datap)
}
return n
})
n := perelocsect(ctxt, Segtext.Sect, ctxt.Textp) + 1
for sect := Segtext.Sect.Next; sect != nil; sect = sect.Next {
n += perelocsect(ctxt, sect, datap)
}
peemitsectreloc(data, func() int {
var n int
for sect := Segdata.Sect; sect != nil; sect = sect.Next {
n += perelocsect(ctxt, sect, datap)
}
return n
})
cpos := coutbuf.Offset()
Cseek(int64(text.PointerToRelocations))
Lputl(uint32(n))
Cseek(cpos)
if n > 0x10000 {
n = 0x10000
text.Characteristics |= IMAGE_SCN_LNK_NRELOC_OVFL
} else {
text.PointerToRelocations += 10 // skip the extend reloc entry
}
text.NumberOfRelocations = uint16(n - 1)
data.PointerToRelocations = uint32(cpos)
// first entry: extended relocs
Lputl(0) // placeholder for number of relocation + 1
Lputl(0)
Wputl(0)
n = 1
for sect := Segdata.Sect; sect != nil; sect = sect.Next {
n += perelocsect(ctxt, sect, datap)
}
cpos = coutbuf.Offset()
Cseek(int64(data.PointerToRelocations))
Lputl(uint32(n))
Cseek(cpos)
if n > 0x10000 {
n = 0x10000
data.Characteristics |= IMAGE_SCN_LNK_NRELOC_OVFL
} else {
data.PointerToRelocations += 10 // skip the extend reloc entry
}
data.NumberOfRelocations = uint16(n - 1)
dottext := ctxt.Syms.Lookup(".text", 0)
ctors.NumberOfRelocations = 1
ctors.PointerToRelocations = uint32(coutbuf.Offset())
Lputl(0)
Lputl(uint32(dottext.Dynid))
switch obj.GOARCH {
default:
fmt.Fprintf(os.Stderr, "link: unknown architecture for PE: %q\n", obj.GOARCH)
os.Exit(2)
case "386":
Wputl(IMAGE_REL_I386_DIR32)
case "amd64":
Wputl(IMAGE_REL_AMD64_ADDR64)
}
peemitsectreloc(ctors, func() int {
dottext := ctxt.Syms.Lookup(".text", 0)
Lputl(0)
Lputl(uint32(dottext.Dynid))
switch obj.GOARCH {
default:
Errorf(dottext, "unknown architecture for PE: %q\n", obj.GOARCH)
case "386":
Wputl(IMAGE_REL_I386_DIR32)
case "amd64":
Wputl(IMAGE_REL_AMD64_ADDR64)
}
return 1
})
}
func (ctxt *Link) dope() {