From: Paul Mackerras <[email protected]>
On ppc, we emulate instructions that cause alignment exceptions. If we are
single-stepping an instruction and it causes an alignment exception, we
will currently do the next instruction as well before taking the
single-step exception. This patch fixes that, so we take the single-step
exception after emulating the instruction.
Signed-off-by: Paul Mackerras <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
---
25-akpm/arch/ppc/kernel/traps.c | 1 +
1 files changed, 1 insertion(+)
diff -puN arch/ppc/kernel/traps.c~ppc32-fix-single-stepping-of-emulated-instructions arch/ppc/kernel/traps.c
--- 25/arch/ppc/kernel/traps.c~ppc32-fix-single-stepping-of-emulated-instructions 2005-04-12 03:21:10.375559576 -0700
+++ 25-akpm/arch/ppc/kernel/traps.c 2005-04-12 03:21:10.378559120 -0700
@@ -679,6 +679,7 @@ void AlignmentException(struct pt_regs *
fixed = fix_alignment(regs);
if (fixed == 1) {
regs->nip += 4; /* skip over emulated instruction */
+ emulate_single_step(regs);
return;
}
if (fixed == -EFAULT) {
_
-
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