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authorKumar Gala <galak@kernel.crashing.org>2007-10-11 17:07:34 -0500
committerKumar Gala <galak@kernel.crashing.org>2007-10-16 09:05:24 -0500
commitba02946a903015840ef672ccc9dc8620a7e83de6 (patch)
treedb338f067ef63fae6b9c7a5dd51b99b1539f8a57 /arch/powerpc/math-emu
parent65a6ec0d72a07f16719e9b7a96e1c4bae044b591 (diff)
downloadlinaro-lsk-ba02946a903015840ef672ccc9dc8620a7e83de6.tar.gz
[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>
Diffstat (limited to 'arch/powerpc/math-emu')
-rw-r--r--arch/powerpc/math-emu/math.c13
1 files changed, 9 insertions, 4 deletions
diff --git a/arch/powerpc/math-emu/math.c b/arch/powerpc/math-emu/math.c
index 69058b2873d..381306bb159 100644
--- a/arch/powerpc/math-emu/math.c
+++ b/arch/powerpc/math-emu/math.c
@@ -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: