From: Jinjie Ruan <ruanjinjie@huawei.com>
To: <catalin.marinas@arm.com>, <will@kernel.org>, <oleg@redhat.com>,
<tglx@kernel.org>, <peterz@infradead.org>, <luto@kernel.org>,
<kees@kernel.org>, <wad@chromium.org>, <ruanjinjie@huawei.com>,
<linusw@kernel.org>, <kevin.brodsky@arm.com>,
<yeoreum.yun@arm.com>, <ldv@strace.io>, <song@kernel.org>,
<thuth@redhat.com>, <ryan.roberts@arm.com>,
<mark.rutland@arm.com>, <ada.coupriediaz@arm.com>,
<anshuman.khandual@arm.com>, <broonie@kernel.org>,
<liqiang01@kylinos.cn>, <pengcan@kylinos.cn>,
<mathieu.desnoyers@efficios.com>, <mingo@kernel.org>,
<edumazet@google.com>, <arnd@arndb.de>,
<linux-arm-kernel@lists.infradead.org>,
<linux-kernel@vger.kernel.org>
Subject: [PATCH v14 01/10] arm64/ptrace: Refactor syscall_trace_enter/exit() to accept flags parameter
Date: Fri, 20 Mar 2026 18:26:11 +0800 [thread overview]
Message-ID: <20260320102620.1336796-2-ruanjinjie@huawei.com> (raw)
In-Reply-To: <20260320102620.1336796-1-ruanjinjie@huawei.com>
Refactor syscall_trace_enter() and syscall_trace_exit() to move thread
flag reading to the caller. This aligns arm64's syscall trace enter/exit
function signature with generic entry framework.
[Changes]
1. Function signature changes:
- syscall_trace_enter(regs) → syscall_trace_enter(regs, flags)
- syscall_trace_exit(regs) → syscall_trace_exit(regs, flags)
2. Move flags reading to caller:
- Previously: read_thread_flags() called inside each function.
- Now: caller (like el0_svc_common) passes flags as parameter.
3. Update syscall.c:
- el0_svc_common() now passes flags to tracing functions and
re-fetches flags before exit to handle potential TIF updates.
[Why this matters]
- Aligns arm64 with the generic entry interface.
- Makes future migration to generic entry framework.
No functional changes intended.
Cc: Will Deacon <will@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Linus Walleij <linusw@kernel.org>
Reviewed-by: Yeoreum Yun <yeoreum.yun@arm.com>
Reviewed-by: Kevin Brodsky <kevin.brodsky@arm.com>
Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com>
---
arch/arm64/include/asm/syscall.h | 4 ++--
arch/arm64/kernel/ptrace.c | 7 ++-----
arch/arm64/kernel/syscall.c | 5 +++--
3 files changed, 7 insertions(+), 9 deletions(-)
diff --git a/arch/arm64/include/asm/syscall.h b/arch/arm64/include/asm/syscall.h
index 5e4c7fc44f73..30b203ef156b 100644
--- a/arch/arm64/include/asm/syscall.h
+++ b/arch/arm64/include/asm/syscall.h
@@ -120,7 +120,7 @@ static inline int syscall_get_arch(struct task_struct *task)
return AUDIT_ARCH_AARCH64;
}
-int syscall_trace_enter(struct pt_regs *regs);
-void syscall_trace_exit(struct pt_regs *regs);
+int syscall_trace_enter(struct pt_regs *regs, unsigned long flags);
+void syscall_trace_exit(struct pt_regs *regs, unsigned long flags);
#endif /* __ASM_SYSCALL_H */
diff --git a/arch/arm64/kernel/ptrace.c b/arch/arm64/kernel/ptrace.c
index ba5eab23fd90..e4d524ccbc7b 100644
--- a/arch/arm64/kernel/ptrace.c
+++ b/arch/arm64/kernel/ptrace.c
@@ -2408,9 +2408,8 @@ static void report_syscall_exit(struct pt_regs *regs)
}
}
-int syscall_trace_enter(struct pt_regs *regs)
+int syscall_trace_enter(struct pt_regs *regs, unsigned long flags)
{
- unsigned long flags = read_thread_flags();
int ret;
if (flags & (_TIF_SYSCALL_EMU | _TIF_SYSCALL_TRACE)) {
@@ -2432,10 +2431,8 @@ int syscall_trace_enter(struct pt_regs *regs)
return regs->syscallno;
}
-void syscall_trace_exit(struct pt_regs *regs)
+void syscall_trace_exit(struct pt_regs *regs, unsigned long flags)
{
- unsigned long flags = read_thread_flags();
-
audit_syscall_exit(regs);
if (flags & _TIF_SYSCALL_TRACEPOINT)
diff --git a/arch/arm64/kernel/syscall.c b/arch/arm64/kernel/syscall.c
index c062badd1a56..e8fd0d60ab09 100644
--- a/arch/arm64/kernel/syscall.c
+++ b/arch/arm64/kernel/syscall.c
@@ -124,7 +124,7 @@ static void el0_svc_common(struct pt_regs *regs, int scno, int sc_nr,
*/
if (scno == NO_SYSCALL)
syscall_set_return_value(current, regs, -ENOSYS, 0);
- scno = syscall_trace_enter(regs);
+ scno = syscall_trace_enter(regs, flags);
if (scno == NO_SYSCALL)
goto trace_exit;
}
@@ -143,7 +143,8 @@ static void el0_svc_common(struct pt_regs *regs, int scno, int sc_nr,
}
trace_exit:
- syscall_trace_exit(regs);
+ flags = read_thread_flags();
+ syscall_trace_exit(regs, flags);
}
void do_el0_svc(struct pt_regs *regs)
--
2.34.1
next prev parent reply other threads:[~2026-03-20 10:25 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-20 10:26 [PATCH v14 00/10] arm64: entry: Convert to Generic Entry Jinjie Ruan
2026-03-20 10:26 ` Jinjie Ruan [this message]
2026-03-20 10:26 ` [PATCH v14 02/10] arm64/ptrace: Use syscall_get_nr() helper for syscall_trace_enter() Jinjie Ruan
2026-03-20 10:26 ` [PATCH v14 03/10] arm64/ptrace: Expand secure_computing() in place Jinjie Ruan
2026-03-20 10:26 ` [PATCH v14 04/10] arm64/ptrace: Use syscall_get_arguments() helper for audit Jinjie Ruan
2026-03-20 10:26 ` [PATCH v14 05/10] arm64: ptrace: Move rseq_syscall() before audit_syscall_exit() Jinjie Ruan
2026-03-20 10:26 ` [PATCH v14 06/10] arm64: syscall: Introduce syscall_exit_to_user_mode_work() Jinjie Ruan
2026-03-20 10:26 ` [PATCH v14 07/10] arm64/ptrace: Define and use _TIF_SYSCALL_EXIT_WORK Jinjie Ruan
2026-03-20 10:26 ` [PATCH v14 08/10] arm64/ptrace: Skip syscall exit reporting for PTRACE_SYSEMU_SINGLESTEP Jinjie Ruan
2026-03-20 10:26 ` [PATCH v14 09/10] arm64: entry: Convert to generic entry Jinjie Ruan
2026-03-20 10:26 ` [PATCH v14 10/10] arm64: Inline el0_svc_common() Jinjie Ruan
2026-04-09 6:29 ` [PATCH v14 00/10] arm64: entry: Convert to Generic Entry Jinjie Ruan
2026-04-09 7:36 ` Mark Rutland
2026-04-09 16:14 ` Kees Cook
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20260320102620.1336796-2-ruanjinjie@huawei.com \
--to=ruanjinjie@huawei.com \
--cc=ada.coupriediaz@arm.com \
--cc=anshuman.khandual@arm.com \
--cc=arnd@arndb.de \
--cc=broonie@kernel.org \
--cc=catalin.marinas@arm.com \
--cc=edumazet@google.com \
--cc=kees@kernel.org \
--cc=kevin.brodsky@arm.com \
--cc=ldv@strace.io \
--cc=linusw@kernel.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=liqiang01@kylinos.cn \
--cc=luto@kernel.org \
--cc=mark.rutland@arm.com \
--cc=mathieu.desnoyers@efficios.com \
--cc=mingo@kernel.org \
--cc=oleg@redhat.com \
--cc=pengcan@kylinos.cn \
--cc=peterz@infradead.org \
--cc=ryan.roberts@arm.com \
--cc=song@kernel.org \
--cc=tglx@kernel.org \
--cc=thuth@redhat.com \
--cc=wad@chromium.org \
--cc=will@kernel.org \
--cc=yeoreum.yun@arm.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox