From 7d6d637dac2050f30a1b57b0a3dc5de4a10616ba Mon Sep 17 00:00:00 2001 From: Roland McGrath Date: Sun, 27 Jul 2008 16:52:52 +1000 Subject: powerpc: Add TIF_NOTIFY_RESUME support for tracehook This adds TIF_NOTIFY_RESUME support for powerpc. When set, we call tracehook_notify_resume() on the way to user mode. This overloads do_signal() to do the work, but changes its arguments to it has the TIF_* bits handy in a register and drops the useless first argument that was always zero. Signed-off-by: Roland McGrath Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/kernel/entry_32.S | 4 ++-- arch/powerpc/kernel/entry_64.S | 3 +-- arch/powerpc/kernel/signal.c | 13 ++++++++++++- 3 files changed, 15 insertions(+), 5 deletions(-) (limited to 'arch') diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S index e6fca6a9014..1cbbf703364 100644 --- a/arch/powerpc/kernel/entry_32.S +++ b/arch/powerpc/kernel/entry_32.S @@ -1060,8 +1060,8 @@ do_user_signal: /* r10 contains MSR_KERNEL here */ SAVE_NVGPRS(r1) rlwinm r3,r3,0,0,30 stw r3,_TRAP(r1) -2: li r3,0 - addi r4,r1,STACK_FRAME_OVERHEAD +2: addi r3,r1,STACK_FRAME_OVERHEAD + mr r4,r9 bl do_signal REST_NVGPRS(r1) b recheck diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S index 79c089e97ce..2d802e97097 100644 --- a/arch/powerpc/kernel/entry_64.S +++ b/arch/powerpc/kernel/entry_64.S @@ -643,8 +643,7 @@ user_work: b .ret_from_except_lite 1: bl .save_nvgprs - li r3,0 - addi r4,r1,STACK_FRAME_OVERHEAD + addi r3,r1,STACK_FRAME_OVERHEAD bl .do_signal b .ret_from_except diff --git a/arch/powerpc/kernel/signal.c b/arch/powerpc/kernel/signal.c index e74aa0ed4e9..a54405ebd7b 100644 --- a/arch/powerpc/kernel/signal.c +++ b/arch/powerpc/kernel/signal.c @@ -112,7 +112,7 @@ static void check_syscall_restart(struct pt_regs *regs, struct k_sigaction *ka, } } -int do_signal(sigset_t *oldset, struct pt_regs *regs) +static int do_signal_pending(sigset_t *oldset, struct pt_regs *regs) { siginfo_t info; int signr; @@ -188,6 +188,17 @@ int do_signal(sigset_t *oldset, struct pt_regs *regs) return ret; } +void do_signal(struct pt_regs *regs, unsigned long thread_info_flags) +{ + if (thread_info_flags & _TIF_SIGPENDING) + do_signal_pending(NULL, regs); + + if (thread_info_flags & _TIF_NOTIFY_RESUME) { + clear_thread_flag(TIF_NOTIFY_RESUME); + tracehook_notify_resume(regs); + } +} + long sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss, unsigned long r5, unsigned long r6, unsigned long r7, unsigned long r8, struct pt_regs *regs) -- cgit v1.2.3