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runtime: fix arm softfloat again for R12

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Missed a case, so now generalized.

R=ken2
CC=golang-dev
https://golang.org/cl/2540042
This commit is contained in:
Russ Cox 2010-10-18 13:24:19 -04:00
parent 9cc8e9ef48
commit 2012604002
1 changed files with 8 additions and 34 deletions
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42
src/pkg/runtime/arm/softfloat.c
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@ -449,7 +449,7 @@ loadstore(uint32 *pc, uint32 *regs)
isload = i>>20&1;
p = i>>24&1;
ud = i>>23&1;
tlen = i>>(22 - 1)&1 | i>>15&1;
tlen = i>>(22 - 1)&1 | i>>15&1; // NOTE(rsc): should this say i>>(22-1)&2 (not &1)?
wb = i>>21&1;
reg = i>>16 &0xf;
freg = i>>12 &0x7;
@ -497,33 +497,6 @@ ret:
fabort();
}
static void
loadconst(uint32 *pc, uint32 *regs)
{
uint32 offset;
uint32 *addr;
if ((*pc & 0xfffff000) != 0xe59fb000 || (*(pc+1) & 0xffff8fff) != 0xed9b0100)
goto undef;
offset = *pc & 0xfff;
addr = (uint32*)((uint8*)pc + offset + 8);
//printf("DEBUG: addr %p *addr %x final %p\n", addr, *addr, *addr + regs[12]);
regs[11] = *addr;
loadstore(pc + 1, regs);
goto ret;
undef:
doabort = 1;
ret:
if (trace || doabort) {
printf(" %p coproc const %x %x %x\n", pc, *pc, *(pc+1), *(pc+2));
}
if (doabort)
fabort();
}
static void
fltfix(uint32 *pc, uint32 *regs)
{
@ -622,12 +595,13 @@ stepflt(uint32 *pc, uint32 *regs)
return 1;
}
// lookahead for virtual instructions that span multiple arm instructions
c = ((*pc & 0x0f000000) >> 20) |
((*(pc + 1) & 0x0f000000) >> 24);
if(c == 0x5d) { // 0101 1101
loadconst(pc, regs);
return 2;
if((i&0xfffff000) == 0xe59fb000) {
// load r11 from pc-relative address.
// might be part of a floating point move
// (or might not, but no harm in simulating
// one instruction too many).
regs[11] = *(uint32*)((uint8*)pc + (i&0xfff) + 8);
return 1;
}
return 0;