From: Sergey Matyukevich <geomatsi@gmail.com>
To: linux-snps-arc@lists.infradead.org
Cc: Vineet Gupta <vgupta@kernel.org>,
Vladimir Isaev <isaev@synopsys.com>,
Sergey Matyukevich <geomatsi@gmail.com>,
Sergey Matyukevich <sergey.matyukevich@synopsys.com>
Subject: [PATCH v2 2/4] ARC: entry: fix syscall_trace_exit argument
Date: Thu, 14 Apr 2022 11:17:22 +0300 [thread overview]
Message-ID: <20220414081724.3177956-3-geomatsi@gmail.com> (raw)
In-Reply-To: <20220414081724.3177956-1-geomatsi@gmail.com>
From: Sergey Matyukevich <sergey.matyukevich@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@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
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next prev parent reply other threads:[~2022-04-14 8:17 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-14 8:17 [PATCH v2 0/4] ARC: add missing bits for better BPF support Sergey Matyukevich
2022-04-14 8:17 ` [PATCH v2 1/4] ARC: enable HAVE_REGS_AND_STACK_ACCESS_API feature Sergey Matyukevich
2022-04-14 8:17 ` Sergey Matyukevich [this message]
2022-04-18 19:14 ` [PATCH v2 2/4] ARC: entry: fix syscall_trace_exit argument Vineet Gupta
2022-04-14 8:17 ` [PATCH v2 3/4] ARC: implement syscall tracepoints Sergey Matyukevich
2022-04-14 8:17 ` [PATCH v2 4/4] ARC: disasm: handle ARCv2 case in kprobe get/set functions Sergey Matyukevich
2022-04-18 19:10 ` [PATCH v2 0/4] ARC: add missing bits for better BPF support Vineet Gupta
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