From: Sergey Matyukevich <sergey.matyukevich@synopsys.com>
Date: Thu, 14 Apr 2022 08:17:22 +0000 (+0300)
Subject: ARC: entry: fix syscall_trace_exit argument
X-Git-Tag: v5.10.113~23
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=5580b974a84b30f6da90a3a562ea0dbfb0038110;p=thirdparty%2Fkernel%2Fstable.git

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 ae656bfc31c3d..301ade4d0b943 100644
--- a/arch/arc/kernel/entry.S
+++ b/arch/arc/kernel/entry.S
@@ -199,6 +199,7 @@ 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