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powerpc: Add TIF_NOTIFY_RESUME support for tracehook

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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
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4
arch/powerpc/kernel/entry_32.S
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@ -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