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cmd/ld: change GC_CALL to 32-bit relative address

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The current code uses 64-bit pc-relative on 64-bit systems,
but in ELF linkers there is no such thing, so we cannot
express this in a .o file. Change to 32-bit.

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/7383055
This commit is contained in:
Russ Cox 2013-02-26 19:42:56 -08:00
parent c8dcaeb25d
commit 56a06db360
2 changed files with 4 additions and 23 deletions
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25
src/cmd/ld/data.c
View File

@ -748,27 +748,6 @@ setuint64(Sym *s, vlong r, uint64 v)
setuintxx(s, r, v, 8);
}
static vlong
addaddrpcrelplus(Sym *s, Sym *t, int32 add)
{
vlong i;
Reloc *r;
if(s->type == 0)
s->type = SDATA;
s->reachable = 1;
i = s->size;
s->size += PtrSize;
symgrow(s, s->size);
r = addrel(s);
r->sym = t;
r->off = i;
r->siz = PtrSize;
r->type = D_PCREL;
r->add = add;
return i;
}
vlong
addaddrplus(Sym *s, Sym *t, int32 add)
{
@ -949,7 +928,9 @@ gcaddsym(Sym *gc, Sym *s, int32 off)
//print("gcaddsym: %s %d %s\n", s->name, s->size, gotype->name);
adduintxx(gc, GC_CALL, PtrSize);
adduintxx(gc, off, PtrSize);
addaddrpcrelplus(gc, decodetype_gc(gotype), 4*PtrSize);
addpcrelplus(gc, decodetype_gc(gotype), 3*PtrSize+4);
if(PtrSize == 8)
adduintxx(gc, 0, 4);
} else {
//print("gcaddsym: %s %d <unknown type>\n", s->name, s->size);
for(a = -off&(PtrSize-1); a+PtrSize<=s->size; a+=PtrSize) {

2
src/pkg/runtime/mgc0.c
View File

@ -837,7 +837,7 @@ scanblock(Workbuf *wbuf, Obj *wp, uintptr nobj, bool keepworking)
// Stack push.
*stack_ptr-- = stack_top;
stack_top = (Frame){1, 0, stack_top.b + pc[1], pc+3 /*return address*/};
pc = (uintptr*)((byte*)pc + (uintptr)pc[2]); // target of the CALL instruction
pc = (uintptr*)((byte*)pc + *(int32*)(pc+2)); // target of the CALL instruction
continue;
case GC_MAP_PTR: