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ARC: entry: fix syscall_trace_exit argument

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commit b1c6ecfdd0 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>
This commit is contained in:
Sergey Matyukevich 2022-04-14 11:17:22 +03:00 committed by Greg Kroah-Hartman
parent 7082650eb8
commit 5580b974a8
1 changed files with 1 additions and 0 deletions
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arch/arc/kernel/entry.S
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@ -199,6 +199,7 @@ tracesys_exit:
st r0, [sp, PT_r0] ; sys call return value in pt_regs st r0, [sp, PT_r0] ; sys call return value in pt_regs
;POST Sys Call Ptrace Hook ;POST Sys Call Ptrace Hook
mov r0, sp ; pt_regs needed
bl @syscall_trace_exit bl @syscall_trace_exit
b ret_from_exception ; NOT ret_from_system_call at is saves r0 which b ret_from_exception ; NOT ret_from_system_call at is saves r0 which
; we'd done before calling post hook above ; we'd done before calling post hook above