ARC: entry: fix syscall_trace_exit argument

commit b1c6ecfdd06907554518ec384ce8e99889d15193 upstream.

Function syscall_trace_exit expects pointer to pt_regs. However
r0 is also used to keep syscall return value. Restore pointer
to pt_regs before calling syscall_trace_exit.

Cc: <stable@vger.kernel.org>
Signed-off-by: Sergey Matyukevich <sergey.matyukevich@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/arc/kernel/entry.S b/arch/arc/kernel/entry.S
index dd77a0c..66ba549 100644 (file)
--- a/arch/arc/kernel/entry.S
+++ b/arch/arc/kernel/entry.S
@@ -196,6 +196,7 @@ tracesys_exit:
        st  r0, [sp, PT_r0]     ; sys call return value in pt_regs
 
        ;POST Sys Call Ptrace Hook
+       mov r0, sp              ; pt_regs needed
        bl  @syscall_trace_exit
        b   ret_from_exception ; NOT ret_from_system_call at is saves r0 which
        ; we'd done before calling post hook above