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[dev.power64] liblink: fix g->panicwrap update code generation

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LGTM=rsc
R=golang-codereviews, rsc
CC=golang-codereviews
https://golang.org/cl/123400043
This commit is contained in:
Shenghou Ma 2014-08-15 15:31:54 -04:00
parent e445f75dbc
commit d0be55a662
1 changed files with 30 additions and 0 deletions
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30
src/liblink/obj9.c
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@ -512,6 +512,36 @@ addstacksplit(Link *ctxt, LSym *cursym)
p->to.type = D_BRANCH;
break;
}
if(cursym->text->reg & WRAPPER) {
// g->panicwrap -= autosize;
// MOVWZ panicwrap_offset(g), R3
// ADD $-autosize, R3
// MOVWZ R3, panicwrap_offset(g)
p->as = AMOVWZ;
p->from.type = D_OREG;
p->from.reg = REGG;
p->from.offset = 2*ctxt->arch->ptrsize;
p->to.type = D_REG;
p->to.reg = 3;
p = appendp(ctxt, p);
p->as = AADD;
p->from.type = D_CONST;
p->from.offset = -autosize;
p->to.type = D_REG;
p->to.reg = 3;
p = appendp(ctxt, p);
p->as = AMOVWZ;
p->from.type = D_REG;
p->from.reg = 3;
p->to.type = D_OREG;
p->to.reg = REGG;
p->to.offset = 2*ctxt->arch->ptrsize;
p = appendp(ctxt, p);
p->as = ARETURN;
}
if(cursym->text->mark & LEAF) {
if(!autosize) {
p->as = ABR;