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[POWERPC] Fix handling of stfiwx math emulation 

Its legal for the stfiwx instruction to have RA = 0 as part of its
effective address calculation.  This is illegal for all other XE
form instructions.

Add code to compute the proper effective address for stfiwx if
RA = 0 rather than treating it as illegal.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
This commit is contained in:
Kumar Gala 2007-10-11 17:07:34 -05:00
parent 65a6ec0d72
commit ba02946a90
1 changed files with 9 additions and 4 deletions
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13
arch/powerpc/math-emu/math.c
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@ -407,11 +407,16 @@ do_mathemu(struct pt_regs *regs)
case XE:
idx = (insn >> 16) & 0x1f;
if (!idx)
goto illegal;
op0 = (void *)&current->thread.fpr[(insn >> 21) & 0x1f];
op1 = (void *)(regs->gpr[idx] + regs->gpr[(insn >> 11) & 0x1f]);
if (!idx) {
if (((insn >> 1) & 0x3ff) == STFIWX)
op1 = (void *)(regs->gpr[(insn >> 11) & 0x1f]);
else
goto illegal;
} else {
op1 = (void *)(regs->gpr[idx] + regs->gpr[(insn >> 11) & 0x1f]);
}
break;
case XEU: