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cmd/link: extract windows-specific code from dynrelocsym

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No functional changes.

Change-Id: Ib31bb3f01b515aac6428ec61e0ef02b269623890
Reviewed-on: https://go-review.googlesource.com/62470
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Hiroshi Ioka 2017-09-09 11:23:29 +09:00 committed by Ian Lance Taylor
parent 9dba7335c0
commit f58c48f834
1 changed files with 41 additions and 38 deletions
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79
src/cmd/link/internal/ld/data.go
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@ -759,49 +759,52 @@ func (ctxt *Link) reloc() {
}
}
func dynrelocsym(ctxt *Link, s *Symbol) {
if Headtype == objabi.Hwindows && Linkmode != LinkExternal {
rel := ctxt.Syms.Lookup(".rel", 0)
if s == rel {
return
func windynrelocsym(ctxt *Link, s *Symbol) {
rel := ctxt.Syms.Lookup(".rel", 0)
if s == rel {
return
}
for ri := 0; ri < len(s.R); ri++ {
r := &s.R[ri]
targ := r.Sym
if targ == nil {
continue
}
for ri := 0; ri < len(s.R); ri++ {
r := &s.R[ri]
targ := r.Sym
if targ == nil {
if !targ.Attr.Reachable() {
if r.Type == objabi.R_WEAKADDROFF {
continue
}
if !targ.Attr.Reachable() {
if r.Type == objabi.R_WEAKADDROFF {
continue
}
Errorf(s, "dynamic relocation to unreachable symbol %s", targ.Name)
}
if r.Sym.Plt == -2 && r.Sym.Got != -2 { // make dynimport JMP table for PE object files.
targ.Plt = int32(rel.Size)
r.Sym = rel
r.Add = int64(targ.Plt)
// jmp *addr
if SysArch.Family == sys.I386 {
Adduint8(ctxt, rel, 0xff)
Adduint8(ctxt, rel, 0x25)
Addaddr(ctxt, rel, targ)
Adduint8(ctxt, rel, 0x90)
Adduint8(ctxt, rel, 0x90)
} else {
Adduint8(ctxt, rel, 0xff)
Adduint8(ctxt, rel, 0x24)
Adduint8(ctxt, rel, 0x25)
addaddrplus4(ctxt, rel, targ, 0)
Adduint8(ctxt, rel, 0x90)
}
} else if r.Sym.Plt >= 0 {
r.Sym = rel
r.Add = int64(targ.Plt)
}
Errorf(s, "dynamic relocation to unreachable symbol %s", targ.Name)
}
if r.Sym.Plt == -2 && r.Sym.Got != -2 { // make dynimport JMP table for PE object files.
targ.Plt = int32(rel.Size)
r.Sym = rel
r.Add = int64(targ.Plt)
// jmp *addr
if SysArch.Family == sys.I386 {
Adduint8(ctxt, rel, 0xff)
Adduint8(ctxt, rel, 0x25)
Addaddr(ctxt, rel, targ)
Adduint8(ctxt, rel, 0x90)
Adduint8(ctxt, rel, 0x90)
} else {
Adduint8(ctxt, rel, 0xff)
Adduint8(ctxt, rel, 0x24)
Adduint8(ctxt, rel, 0x25)
addaddrplus4(ctxt, rel, targ, 0)
Adduint8(ctxt, rel, 0x90)
}
} else if r.Sym.Plt >= 0 {
r.Sym = rel
r.Add = int64(targ.Plt)
}
}
}
func dynrelocsym(ctxt *Link, s *Symbol) {
if Headtype == objabi.Hwindows && Linkmode != LinkExternal {
windynrelocsym(ctxt, s)
return
}