Commit eef33618 authored Feb 06, 2009 by Ananth N Mavinakayanahalli Committed by Benjamin Herrenschmidt Feb 10, 2009

powerpc: Don't emulate mr. instructions



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>

parent 6c24b174

arch/powerpc/lib/sstep.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -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 */