From: Paul Mackerras 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 Signed-off-by: Andrew Morton --- 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 2005-04-04 18:00:52.000000000 -0700 +++ 25-akpm/arch/ppc/kernel/traps.c 2005-04-04 18:00:52.000000000 -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) { _