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[dev.link] cmd/link/internal/loader: add Loader plt/got access methods

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Add accessor methods to get at the symbol {plt,got} value for
PE symbols. Fix a bug in the loaders SetPlt/SetGot methods.

Change-Id: I975bd6b86122622b206487c8798f8290ecd25a57
Reviewed-on: https://go-review.googlesource.com/c/go/+/225199
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
This commit is contained in:
Than McIntosh 2020-03-24 09:23:09 -04:00
parent a9fb2e5155
commit 912e64ba46
1 changed files with 20 additions and 4 deletions
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24
src/cmd/link/internal/loader/loader.go
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@ -1133,24 +1133,40 @@ func (l *Loader) SetSymElfType(i Sym, et elf.SymType) {
} }
} }
// SymPlt returns the plt value for pe symbols.
func (l *Loader) SymPlt(s Sym) int32 {
if v, ok := l.plt[s]; ok {
return v
}
return -1
}
// SetPlt sets the plt value for pe symbols. // SetPlt sets the plt value for pe symbols.
func (l *Loader) SetPlt(i Sym, v int32) { func (l *Loader) SetPlt(i Sym, v int32) {
if i >= Sym(len(l.objSyms)) || i == 0 { if i >= Sym(len(l.objSyms)) || i == 0 {
panic("bad symbol for SetPlt") panic("bad symbol for SetPlt")
} }
if v == 0 { if v == -1 {
delete(l.plt, i) delete(l.plt, i)
} else { } else {
l.plt[i] = v l.plt[i] = v
} }
} }
// SymGot returns the got value for pe symbols.
func (l *Loader) SymGot(s Sym) int32 {
if v, ok := l.got[s]; ok {
return v
}
return -1
}
// SetGot sets the got value for pe symbols. // SetGot sets the got value for pe symbols.
func (l *Loader) SetGot(i Sym, v int32) { func (l *Loader) SetGot(i Sym, v int32) {
if i >= Sym(len(l.objSyms)) || i == 0 { if i >= Sym(len(l.objSyms)) || i == 0 {
panic("bad symbol for SetGot") panic("bad symbol for SetGot")
} }
if v == 0 { if v == -1 {
delete(l.got, i) delete(l.got, i)
} else { } else {
l.got[i] = v l.got[i] = v
@ -1257,11 +1273,11 @@ func (l *Loader) SymLocalentry(i Sym) uint8 {
return l.localentry[i] return l.localentry[i]
} }
// SetSymExtname sets the "extname" attribute for a symbol. // SetSymLocalentry sets the "local entry" attribute for a symbol.
func (l *Loader) SetSymLocalentry(i Sym, value uint8) { func (l *Loader) SetSymLocalentry(i Sym, value uint8) {
// reject bad symbols // reject bad symbols
if i >= Sym(len(l.objSyms)) || i == 0 { if i >= Sym(len(l.objSyms)) || i == 0 {
panic("bad symbol index in SetExtname") panic("bad symbol index in SetSymLocalentry")
} }
if value == 0 { if value == 0 {
delete(l.localentry, i) delete(l.localentry, i)