From: Jinjie Ruan <ruanjinjie@huawei.com>
To: <catalin.marinas@arm.com>, <will@kernel.org>,
<mark.rutland@arm.com>, <oleg@redhat.com>, <kees@kernel.org>,
<luto@amacapital.net>, <wad@chromium.org>, <peterz@infradead.org>,
<ada.coupriediaz@arm.com>, <linusw@kernel.org>,
<kevin.brodsky@arm.com>, <yeoreum.yun@arm.com>,
<thuth@redhat.com>, <james.morse@arm.com>,
<vladimir.murzin@arm.com>, <broonie@kernel.org>,
<pengcan@kylinos.cn>, <liqiang01@kylinos.cn>,
<ryan.roberts@arm.com>, <linux-arm-kernel@lists.infradead.org>,
<linux-kernel@vger.kernel.org>
Cc: <ruanjinjie@huawei.com>
Subject: [PATCH v18 07/14] arm64: ptrace: Pass thread flags to trace enter/exit
Date: Wed, 2 Sep 2026 17:55:30 +0800 [thread overview]
Message-ID: <20260902095537.602517-8-ruanjinjie@huawei.com> (raw)
In-Reply-To: <20260902095537.602517-1-ruanjinjie@huawei.com>
Move the reading of thread flags from inside arm64_syscall_trace_enter()
and syscall_trace_exit() to their callers. This aligns the function
signatures with the generic entry framework, where the caller
is responsible for supplying the flags.
In el0_svc_common(), the flags are now passed directly to the tracing
functions, and re-read before the enter/exit path to reflect any updates.
No functional change intended; this is a preparatory step for
converting arm64 to the generic entry infrastructure.
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Ada Couprie Diaz <ada.coupriediaz@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 | 6 ++----
arch/arm64/kernel/syscall.c | 11 +++++++----
3 files changed, 11 insertions(+), 10 deletions(-)
diff --git a/arch/arm64/include/asm/syscall.h b/arch/arm64/include/asm/syscall.h
index d1dabdcde41c..696739f5a250 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 arm64_syscall_trace_enter(struct pt_regs *regs);
-void syscall_trace_exit(struct pt_regs *regs);
+int arm64_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 05800664695c..ed970576d9a7 100644
--- a/arch/arm64/kernel/ptrace.c
+++ b/arch/arm64/kernel/ptrace.c
@@ -2469,9 +2469,8 @@ static inline void syscall_enter_audit(struct pt_regs *regs)
}
#endif
-int arm64_syscall_trace_enter(struct pt_regs *regs)
+int arm64_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)) {
@@ -2506,9 +2505,8 @@ static inline bool report_single_step(unsigned long flags)
return flags & _TIF_SINGLESTEP;
}
-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();
bool step;
rseq_syscall(regs);
diff --git a/arch/arm64/kernel/syscall.c b/arch/arm64/kernel/syscall.c
index b8d7d29a431b..e778aac6fab9 100644
--- a/arch/arm64/kernel/syscall.c
+++ b/arch/arm64/kernel/syscall.c
@@ -113,7 +113,7 @@ 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 = arm64_syscall_trace_enter(regs);
+ scno = arm64_syscall_trace_enter(regs, read_thread_flags());
if (scno == NO_SYSCALL)
goto trace_exit;
}
@@ -127,13 +127,16 @@ static void el0_svc_common(struct pt_regs *regs, int scno, int sc_nr,
*/
if (!has_syscall_work(flags) && !IS_ENABLED(CONFIG_DEBUG_RSEQ)) {
flags = read_thread_flags();
- if (has_syscall_work(flags) || flags & _TIF_SINGLESTEP)
- syscall_trace_exit(regs);
+ if (has_syscall_work(flags) || flags & _TIF_SINGLESTEP) {
+ flags = read_thread_flags();
+ syscall_trace_exit(regs, flags);
+ }
return;
}
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:[~2026-09-02 9:55 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-02 9:55 [PATCH v18 00/14] arm64: entry: Convert to Generic Entry Jinjie Ruan
2026-09-02 9:55 ` [PATCH v18 01/14] arm64: ptrace: Fix redundant syscall exit stop for PTRACE_SYSEMU_SINGLESTEP Jinjie Ruan
2026-09-02 9:55 ` [PATCH v18 02/14] arm64: ptrace: Rework audit_syscall_entry() Jinjie Ruan
2026-09-02 9:55 ` [PATCH v18 03/14] arm64: ptrace: Open-code seccomp check in syscall_trace_enter() Jinjie Ruan
2026-09-02 9:55 ` [PATCH v18 04/14] arm64: ptrace: Rename and clean up syscall_trace_enter() Jinjie Ruan
2026-09-02 9:55 ` [PATCH v18 05/14] arm64: ptrace: Protect rseq_syscall() from tracer PC modifications Jinjie Ruan
2026-09-02 9:55 ` [PATCH v18 06/14] arm64: syscall: Rework the syscall exit path in el0_svc_common() Jinjie Ruan
2026-09-02 9:55 ` Jinjie Ruan [this message]
2026-09-02 9:55 ` [PATCH v18 08/14] arm64: ptrace: Extract arm64_syscall_exit_to_user_mode_work() helper Jinjie Ruan
2026-09-02 9:55 ` [PATCH v18 09/14] arm64: ptrace: Align syscall exit work semantics with generic entry Jinjie Ruan
2026-09-02 9:55 ` [PATCH v18 10/14] arm64: syscall: Use exit-specific flags check in el0_svc_common() Jinjie Ruan
2026-09-02 9:55 ` [PATCH v18 11/14] arm64: syscall: Simplify el0_svc_common() syscall exit path Jinjie Ruan
2026-09-02 9:55 ` [PATCH v18 12/14] arm64: ptrace: Make return type of arm64_syscall_trace_enter() bool Jinjie Ruan
2026-09-02 9:55 ` [PATCH v18 13/14] arm64: entry: Convert to generic entry Jinjie Ruan
2026-09-02 9:55 ` [PATCH v18 14/14] arm64: Inline el0_svc_common() Jinjie Ruan
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