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powerpc: Don't emulate mr. instructions

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Currently emulate_step() emulates mr. instructions without updating cr0
and this can be disastrous. Don't emulate mr.

This bug has been around for a while, but I am not sure if its a worthy
-stable candidate. I'll leave it to Ben do decide.

Signed-off-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Ananth N Mavinakayanahalli 2009-02-06 02:02:00 +00:00 committed by Benjamin Herrenschmidt
parent 6c24b17453
commit eef336189b
1 changed files with 2 additions and 0 deletions
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arch/powerpc/lib/sstep.c
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@ -172,6 +172,8 @@ int __kprobes emulate_step(struct pt_regs *regs, unsigned int instr)
}
break;
case 0x378: /* orx */
if (instr & 1)
break;
rs = (instr >> 21) & 0x1f;
rb = (instr >> 11) & 0x1f;
if (rs == rb) { /* mr */