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cmd/internal/obj/ppc64: Fix ADUFFxxxx generation on aix/ppc64

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ADUFFCOPY and ADUFFZERO instructions weren't handled by rewriteToUseTOC.
These instructions are considered as a simple branch except with -dynlink
where they become an indirect call.

Fixes #34604

Change-Id: I16ca6a152164966fb9cbf792219a8a39aad2b53b
Reviewed-on: https://go-review.googlesource.com/c/go/+/197842
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Clément Chigot 2019-09-30 11:24:19 +02:00 committed by Cherry Zhang
parent a49067aab6
commit 09c9bced82
1 changed files with 59 additions and 3 deletions
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62
src/cmd/internal/obj/ppc64/obj9.go
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@ -106,10 +106,10 @@ func progedit(ctxt *obj.Link, p *obj.Prog, newprog obj.ProgAlloc) {
p.As = AADD
}
}
if c.ctxt.Flag_dynlink {
c.rewriteToUseGot(p)
} else if c.ctxt.Headtype == objabi.Haix {
if c.ctxt.Headtype == objabi.Haix {
c.rewriteToUseTOC(p)
} else if c.ctxt.Flag_dynlink {
c.rewriteToUseGot(p)
}
}
@ -120,6 +120,62 @@ func (c *ctxt9) rewriteToUseTOC(p *obj.Prog) {
return
}
if p.As == obj.ADUFFCOPY || p.As == obj.ADUFFZERO {
// ADUFFZERO/ADUFFCOPY is considered as an ABL except in dynamic
// link where it should be an indirect call.
if !c.ctxt.Flag_dynlink {
return
}
// ADUFFxxx $offset
// becomes
// MOVD runtime.duffxxx@TOC, R12
// ADD $offset, R12
// MOVD R12, CTR
// BL (CTR)
var sym *obj.LSym
if p.As == obj.ADUFFZERO {
sym = c.ctxt.Lookup("runtime.duffzero")
} else {
sym = c.ctxt.Lookup("runtime.duffcopy")
}
// Retrieve or create the TOC anchor.
symtoc := c.ctxt.LookupInit("TOC."+sym.Name, func(s *obj.LSym) {
s.Type = objabi.SDATA
s.Set(obj.AttrDuplicateOK, true)
c.ctxt.Data = append(c.ctxt.Data, s)
s.WriteAddr(c.ctxt, 0, 8, sym, 0)
})
offset := p.To.Offset
p.As = AMOVD
p.From.Type = obj.TYPE_MEM
p.From.Name = obj.NAME_TOCREF
p.From.Sym = symtoc
p.To.Type = obj.TYPE_REG
p.To.Reg = REG_R12
p.To.Name = obj.NAME_NONE
p.To.Offset = 0
p.To.Sym = nil
p1 := obj.Appendp(p, c.newprog)
p1.As = AADD
p1.From.Type = obj.TYPE_CONST
p1.From.Offset = offset
p1.To.Type = obj.TYPE_REG
p1.To.Reg = REG_R12
p2 := obj.Appendp(p1, c.newprog)
p2.As = AMOVD
p2.From.Type = obj.TYPE_REG
p2.From.Reg = REG_R12
p2.To.Type = obj.TYPE_REG
p2.To.Reg = REG_CTR
p3 := obj.Appendp(p2, c.newprog)
p3.As = obj.ACALL
p3.From.Type = obj.TYPE_REG
p3.From.Reg = REG_R12
p3.To.Type = obj.TYPE_REG
p3.To.Reg = REG_CTR
}
var source *obj.Addr
if p.From.Name == obj.NAME_EXTERN || p.From.Name == obj.NAME_STATIC {
if p.From.Type == obj.TYPE_ADDR {