[PATCH v2 2/4] ARC: entry: fix syscall_trace_exit argument

[Sergey Matyukevich]

From: Sergey Matyukevich <sergey.matyukevich at synopsys.com>

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.

Signed-off-by: Sergey Matyukevich <sergey.matyukevich at synopsys.com>
---
 arch/arc/kernel/entry.S | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arc/kernel/entry.S b/arch/arc/kernel/entry.S
index dd77a0c8f740..66ba549b520f 100644
--- 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
-- 
2.35.1