Hi Paul,
While we are at it, can we also add nop to the list of emulated
instructions?
Ananth
---
From: Ananth N Mavinakayanahalli <ana...@in.ibm.com>
Emulate ori 0,0,0 (nop).
The long winded way is to do:
case 24:
rd = (instr >> 21) & 0x1f;
if (rd != 0)
break;
rb = (instr >> 11) & 0x1f;
if (rb != 0)
break;
imm = (instr & 0xffff);
if (imm == 0) {
regs->nip += 4;
return 1;
}
break;
But, the following is more straightforward for this case at least.
Signed-off-by: Ananth N Mavinakayanahalli <ana...@in.ibm.com>
Signed-off-by: Srikar Dronamraju <sri...@linux.vnet.ibm.com>
---
arch/powerpc/lib/sstep.c | 6 ++++++
1 file changed, 6 insertions(+)
Index: linux-27may/arch/powerpc/lib/sstep.c
===================================================================
--- linux-27may.orig/arch/powerpc/lib/sstep.c
+++ linux-27may/arch/powerpc/lib/sstep.c
@@ -412,6 +412,12 @@ int __kprobes emulate_step(struct pt_reg
int err;
mm_segment_t oldfs;
+ /* ori 0,0,0 is a nop. Emulate that too */
+ if (instr == 0x60000000) {
+ regs->nip += 4;
+ return 1;
+ }
+
opcode = instr >> 26;
switch (opcode) {
case 16: /* bc */
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