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[dev.link] cmd/link: on AIX, use relocation to locate target symbol from TOC symbol

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On AIX, a TOC symbol always has a relocation to its target symbol.
Instead of using name lookup to locate the target symbol, we can
just use the relocation.

Using name lookup, besides being less efficient, needs to provide
the right symbol version. In this particular case, we are looking
for a data symbol so it is almost always version 0. But in case
that it is a text symbol, we may get an ABIALIAS symbol, which
does not have its Sect set.

Change-Id: I1ecfd284b04a86bbbc450059ee89d99d40493e51
Reviewed-on: https://go-review.googlesource.com/c/go/+/201019
Reviewed-by: Than McIntosh <thanm@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Cherry Zhang 2019-10-11 21:51:01 -04:00
parent c9f633487b
commit cfa421c9a6
1 changed files with 1 additions and 1 deletions
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2
src/cmd/link/internal/ppc64/asm.go
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@ -550,7 +550,7 @@ func archreloctoc(ctxt *ld.Link, r *sym.Reloc, s *sym.Symbol, val int64) int64 {
const prefix = "TOC." const prefix = "TOC."
var tarSym *sym.Symbol var tarSym *sym.Symbol
if strings.HasPrefix(r.Sym.Name, prefix) { if strings.HasPrefix(r.Sym.Name, prefix) {
tarSym = ctxt.Syms.ROLookup(strings.TrimPrefix(r.Sym.Name, prefix), 0) tarSym = r.Sym.R[0].Sym
} else { } else {
ld.Errorf(s, "archreloctoc called for a symbol without TOC anchor") ld.Errorf(s, "archreloctoc called for a symbol without TOC anchor")
} }