lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

powerpc: Add TIF_NOTIFY_RESUME support for tracehook

Browse Source 
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 <roland@redhat.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Roland McGrath
2008-07-27 16:52:52 +10:00
committed by Benjamin Herrenschmidt
parent f1ba12856b
commit 7d6d637dac
5 changed files with 20 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
arch/powerpc/kernel/entry_32.S
View File

@@ -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

3
arch/powerpc/kernel/entry_64.S
View File

@@ -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

13
arch/powerpc/kernel/signal.c
View File

@@ -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)