From: Francis Laniel <flaniel@linux.microsoft.com>
To: linux-trace-devel@vger.kernel.org
Cc: James Morse <james.morse@arm.com>,
Daniel Kiss <daniel.kiss@arm.com>,
Francis Laniel <flaniel@linux.microsoft.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>, Mark Brown <broonie@kernel.org>,
Peter Collingbourne <pcc@google.com>,
Kees Cook <keescook@chromium.org>,
Mark Rutland <mark.rutland@arm.com>,
Christophe Leroy <christophe.leroy@csgroup.eu>,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: [PATCH v2 1/1] arm64: Do not forget syscall when starting a new thread.
Date: Wed, 8 Jun 2022 17:24:46 +0100 [thread overview]
Message-ID: <20220608162447.666494-2-flaniel@linux.microsoft.com> (raw)
In-Reply-To: <20220608162447.666494-1-flaniel@linux.microsoft.com>
This patch enables exeve*() to be traced with syscalls:sys_exit_execve
tracepoint.
Previous to it, by calling forget_syscall(), this tracepoint would not
print its information as syscall is -1.
So, this patch removes call to forget_syscall() and set regs->syscallno
to its previous value.
Signed-off-by: Francis Laniel <flaniel@linux.microsoft.com>
---
arch/arm64/include/asm/processor.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/include/asm/processor.h b/arch/arm64/include/asm/processor.h
index 9e58749db21d..86eb0bfe3b38 100644
--- a/arch/arm64/include/asm/processor.h
+++ b/arch/arm64/include/asm/processor.h
@@ -272,8 +272,9 @@ void tls_preserve_current_state(void);
static inline void start_thread_common(struct pt_regs *regs, unsigned long pc)
{
+ s32 previous_syscall = regs->syscallno;
memset(regs, 0, sizeof(*regs));
- forget_syscall(regs);
+ regs->syscallno = previous_syscall;
regs->pc = pc;
if (system_uses_irq_prio_masking())
--
2.25.1
next prev parent reply other threads:[~2022-06-08 16:25 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-08 16:24 [PATCH v2 0/1] Remove forget_syscall() from start_thread_common() Francis Laniel
2022-06-08 16:24 ` Francis Laniel [this message]
2022-06-28 13:58 ` [PATCH v2 1/1] arm64: Do not forget syscall when starting a new thread Will Deacon
2022-06-28 19:26 ` Francis Laniel
2022-06-30 17:16 ` Francis Laniel
2022-07-01 11:36 ` Will Deacon
2022-07-01 12:10 ` Francis Laniel
2022-06-23 14:09 ` [PATCH v2 0/1] Remove forget_syscall() from start_thread_common() Francis Laniel
2022-07-01 15:41 ` Will Deacon
2022-07-04 8:55 ` Francis Laniel
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