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Message-ID: <ZuqJi3Xoqe2S1i8N@J2N7QTR9R3>
Date: Wed, 18 Sep 2024 10:04:27 +0200
From: Mark Rutland <mark.rutland@....com>
To: Jinjie Ruan <ruanjinjie@...wei.com>
Cc: catalin.marinas@....com, will@...nel.org, oleg@...hat.com,
tglx@...utronix.de, peterz@...radead.org, luto@...nel.org,
kees@...nel.org, wad@...omium.org, rostedt@...dmis.org,
arnd@...db.de, ardb@...nel.org, broonie@...nel.org,
rick.p.edgecombe@...el.com, leobras@...hat.com,
linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 3/3] arm64: entry: Convert to generic entry
On Wed, Sep 18, 2024 at 09:59:19AM +0800, Jinjie Ruan wrote:
> Hi, Catalin, Will and Mark, do you have any good suggestions and ideas?
Hi,
Sorry, this is on my queue of things to review, but I haven't had the
chance to review this in detail yet. This needs a thorough review for
things like noinstr safety, and I intend to take a look at this after
Linux Plumbers Conference.
Mark.
>
> On 2024/6/29 16:56, Jinjie Ruan wrote:
> > Currently, x86, Riscv, Loongarch use the generic entry. Convert arm64
> > to use the generic entry infrastructure from kernel/entry/*. The generic
> > entry makes maintainers' work easier and codes more elegant, which also
> > removed duplicate 150+ LOC. The changes are below:
> >
> > - Remove TIF_SYSCALL_* flag, _TIF_WORK_MASK, _TIF_SYSCALL_WORK
> >
> > - Remove syscall_trace_enter/exit() and use generic one.
> >
> > - Remove *enter_from/exit_to_kernel_mode(), and wrap with generic
> > irqentry_enter/exit().
> >
> > - Remove *enter_from/exit_to_user_mode(), and wrap with generic
> > irqentry_enter_from/exit_to_user_mode().
> >
> > - Remove arm64_enter/exit_nmi() and use generic irqentry_nmi_enter/exit().
> >
> > - Remove PREEMPT_DYNAMIC code, as generic entry will do it ok by
> > implementing arch_irqentry_exit_need_resched().
> >
> > Tested ok with following test cases on Qemu cortex-a53 and HiSilicon
> > Kunpeng-920:
> >
> > - Run `perf top` command
> >
> > - Switch between different `dynamic preempt` mode
> >
> > - Use `pseudo nmi`
> >
> > - stress-ng CPU stress test.
> >
> > - MTE test case in Documentation/arch/arm64/memory-tagging-extension.rst
> > and all test cases in tools/testing/selftests/arm64/mte/* (Only Qemu).
> >
> > Signed-off-by: Jinjie Ruan <ruanjinjie@...wei.com>
> > Tested-by: Jinjie Ruan <ruanjinjie@...wei.com>
> > Tested-by: Kees Cook <kees@...nel.org>
> > ---
> > v3:
> > - Test the MTE test cases.
> > - Handle forget_syscall() in arch_post_report_syscall_entry()
> > - Rebased on the previous patch, so move the arch funcs to entry-common.h.
> > - Change __always_inline() to inline for arch_enter_from_kernel_mode() and
> > arch_exit_to_kernel_mode_prepare(), add inline for the other arch funcs.
> > - Remove unused signal.h for entry-common.h.
> >
> > v2:
> > - Add Tested-by.
> > - Rebased on the refactored report_syscall() code.
> > - Add comment for arch_prepare_report_syscall_exit().
> > - Update the commit message.
> > - Adjust entry-common.h header file inclusion to alphabetical order.
> > ---
> > arch/arm64/Kconfig | 1 +
> > arch/arm64/include/asm/entry-common.h | 172 ++++++++++++
> > arch/arm64/include/asm/syscall.h | 6 +-
> > arch/arm64/include/asm/thread_info.h | 23 +-
> > arch/arm64/kernel/entry-common.c | 368 +++++---------------------
> > arch/arm64/kernel/ptrace.c | 101 -------
> > arch/arm64/kernel/signal.c | 3 +-
> > arch/arm64/kernel/syscall.c | 18 +-
> > 8 files changed, 264 insertions(+), 428 deletions(-)
> > create mode 100644 arch/arm64/include/asm/entry-common.h
> >
> > diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> > index 5d91259ee7b5..e6ccc5ea06fe 100644
> > --- a/arch/arm64/Kconfig
> > +++ b/arch/arm64/Kconfig
> > @@ -138,6 +138,7 @@ config ARM64
> > select GENERIC_CPU_DEVICES
> > select GENERIC_CPU_VULNERABILITIES
> > select GENERIC_EARLY_IOREMAP
> > + select GENERIC_ENTRY
> > select GENERIC_IDLE_POLL_SETUP
> > select GENERIC_IOREMAP
> > select GENERIC_IRQ_IPI
> > diff --git a/arch/arm64/include/asm/entry-common.h b/arch/arm64/include/asm/entry-common.h
> > new file mode 100644
> > index 000000000000..a14d62b2eb69
> > --- /dev/null
> > +++ b/arch/arm64/include/asm/entry-common.h
> > @@ -0,0 +1,172 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +
> > +#ifndef _ASM_ARM64_ENTRY_COMMON_H
> > +#define _ASM_ARM64_ENTRY_COMMON_H
> > +
> > +#include <linux/thread_info.h>
> > +
> > +#include <asm/daifflags.h>
> > +#include <asm/fpsimd.h>
> > +#include <asm/mte.h>
> > +#include <asm/stacktrace.h>
> > +
> > +enum ptrace_syscall_dir {
> > + PTRACE_SYSCALL_ENTER = 0,
> > + PTRACE_SYSCALL_EXIT,
> > +};
> > +
> > +#define ARCH_EXIT_TO_USER_MODE_WORK (_TIF_MTE_ASYNC_FAULT | _TIF_FOREIGN_FPSTATE)
> > +
> > +static __always_inline void arch_enter_from_user_mode(struct pt_regs *regs)
> > +{
> > + mte_disable_tco_entry(current);
> > +}
> > +
> > +#define arch_enter_from_user_mode arch_enter_from_user_mode
> > +
> > +static __always_inline void arch_exit_to_user_mode_work(struct pt_regs *regs,
> > + unsigned long ti_work)
> > +{
> > + if (ti_work & _TIF_MTE_ASYNC_FAULT) {
> > + clear_thread_flag(TIF_MTE_ASYNC_FAULT);
> > + send_sig_fault(SIGSEGV, SEGV_MTEAERR, (void __user *)NULL, current);
> > + }
> > +
> > + if (ti_work & _TIF_FOREIGN_FPSTATE)
> > + fpsimd_restore_current_state();
> > +}
> > +
> > +#define arch_exit_to_user_mode_work arch_exit_to_user_mode_work
> > +
> > +static inline void arch_exit_to_user_mode_prepare(struct pt_regs *regs,
> > + unsigned long ti_work)
> > +{
> > + local_daif_mask();
> > + mte_check_tfsr_exit();
> > +}
> > +
> > +#define arch_exit_to_user_mode_prepare arch_exit_to_user_mode_prepare
> > +
> > +static inline void arch_enter_from_kernel_mode(struct pt_regs *regs)
> > +{
> > + mte_check_tfsr_entry();
> > + mte_disable_tco_entry(current);
> > +}
> > +
> > +#define arch_enter_from_kernel_mode arch_enter_from_kernel_mode
> > +
> > +static inline void arch_exit_to_kernel_mode_prepare(struct pt_regs *regs)
> > +{
> > + mte_check_tfsr_exit();
> > +}
> > +
> > +#define arch_exit_to_kernel_mode_prepare arch_exit_to_kernel_mode_prepare
> > +
> > +static inline bool arch_irqentry_exit_need_resched(void)
> > +{
> > + /*
> > + * DAIF.DA are cleared at the start of IRQ/FIQ handling, and when GIC
> > + * priority masking is used the GIC irqchip driver will clear DAIF.IF
> > + * using gic_arch_enable_irqs() for normal IRQs. If anything is set in
> > + * DAIF we must have handled an NMI, so skip preemption.
> > + */
> > + if (system_uses_irq_prio_masking() && read_sysreg(daif))
> > + return false;
> > +
> > + /*
> > + * Preempting a task from an IRQ means we leave copies of PSTATE
> > + * on the stack. cpufeature's enable calls may modify PSTATE, but
> > + * resuming one of these preempted tasks would undo those changes.
> > + *
> > + * Only allow a task to be preempted once cpufeatures have been
> > + * enabled.
> > + */
> > + if (!system_capabilities_finalized())
> > + return false;
> > +
> > + return true;
> > +}
> > +
> > +#define arch_irqentry_exit_need_resched arch_irqentry_exit_need_resched
> > +
> > +static inline unsigned long arch_prepare_report_syscall_entry(struct pt_regs *regs)
> > +{
> > + unsigned long saved_reg;
> > + int regno;
> > +
> > + /*
> > + * We have some ABI weirdness here in the way that we handle syscall
> > + * exit stops because we indicate whether or not the stop has been
> > + * signalled from syscall entry or syscall exit by clobbering a general
> > + * purpose register (ip/r12 for AArch32, x7 for AArch64) in the tracee
> > + * and restoring its old value after the stop. This means that:
> > + *
> > + * - Any writes by the tracer to this register during the stop are
> > + * ignored/discarded.
> > + *
> > + * - The actual value of the register is not available during the stop,
> > + * so the tracer cannot save it and restore it later.
> > + *
> > + * - Syscall stops behave differently to seccomp and pseudo-step traps
> > + * (the latter do not nobble any registers).
> > + */
> > + regno = (is_compat_task() ? 12 : 7);
> > + saved_reg = regs->regs[regno];
> > + regs->regs[regno] = PTRACE_SYSCALL_ENTER;
> > +
> > + return saved_reg;
> > +}
> > +
> > +#define arch_prepare_report_syscall_entry arch_prepare_report_syscall_entry
> > +
> > +static inline void arch_post_report_syscall_entry(struct pt_regs *regs,
> > + unsigned long saved_reg, long ret)
> > +{
> > + int regno = (is_compat_task() ? 12 : 7);
> > +
> > + if (ret)
> > + forget_syscall(regs);
> > +
> > + regs->regs[regno] = saved_reg;
> > +}
> > +
> > +#define arch_post_report_syscall_entry arch_post_report_syscall_entry
> > +
> > +static inline unsigned long arch_prepare_report_syscall_exit(struct pt_regs *regs,
> > + unsigned long work)
> > +{
> > + unsigned long saved_reg;
> > + int regno;
> > +
> > + /* See comment for arch_prepare_report_syscall_entry() */
> > + regno = (is_compat_task() ? 12 : 7);
> > + saved_reg = regs->regs[regno];
> > + regs->regs[regno] = PTRACE_SYSCALL_EXIT;
> > +
> > + if (report_single_step(work)) {
> > + /*
> > + * Signal a pseudo-step exception since we are stepping but
> > + * tracer modifications to the registers may have rewound the
> > + * state machine.
> > + */
> > + regs->regs[regno] = saved_reg;
> > + }
> > +
> > + return saved_reg;
> > +}
> > +
> > +#define arch_prepare_report_syscall_exit arch_prepare_report_syscall_exit
> > +
> > +static inline void arch_post_report_syscall_exit(struct pt_regs *regs,
> > + unsigned long saved_reg,
> > + unsigned long work)
> > +{
> > + int regno = (is_compat_task() ? 12 : 7);
> > +
> > + if (!report_single_step(work))
> > + regs->regs[regno] = saved_reg;
> > +}
> > +
> > +#define arch_post_report_syscall_exit arch_post_report_syscall_exit
> > +
> > +#endif /* _ASM_ARM64_ENTRY_COMMON_H */
> > diff --git a/arch/arm64/include/asm/syscall.h b/arch/arm64/include/asm/syscall.h
> > index ab8e14b96f68..9891b15da4c3 100644
> > --- a/arch/arm64/include/asm/syscall.h
> > +++ b/arch/arm64/include/asm/syscall.h
> > @@ -85,7 +85,9 @@ 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);
> > +static inline bool arch_syscall_is_vdso_sigreturn(struct pt_regs *regs)
> > +{
> > + return false;
> > +}
> >
> > #endif /* __ASM_SYSCALL_H */
> > diff --git a/arch/arm64/include/asm/thread_info.h b/arch/arm64/include/asm/thread_info.h
> > index e72a3bf9e563..ec5d74c53bf9 100644
> > --- a/arch/arm64/include/asm/thread_info.h
> > +++ b/arch/arm64/include/asm/thread_info.h
> > @@ -43,6 +43,7 @@ struct thread_info {
> > void *scs_sp;
> > #endif
> > u32 cpu;
> > + unsigned long syscall_work; /* SYSCALL_WORK_ flags */
> > };
> >
> > #define thread_saved_pc(tsk) \
> > @@ -64,11 +65,6 @@ void arch_setup_new_exec(void);
> > #define TIF_UPROBE 4 /* uprobe breakpoint or singlestep */
> > #define TIF_MTE_ASYNC_FAULT 5 /* MTE Asynchronous Tag Check Fault */
> > #define TIF_NOTIFY_SIGNAL 6 /* signal notifications exist */
> > -#define TIF_SYSCALL_TRACE 8 /* syscall trace active */
> > -#define TIF_SYSCALL_AUDIT 9 /* syscall auditing */
> > -#define TIF_SYSCALL_TRACEPOINT 10 /* syscall tracepoint for ftrace */
> > -#define TIF_SECCOMP 11 /* syscall secure computing */
> > -#define TIF_SYSCALL_EMU 12 /* syscall emulation active */
> > #define TIF_MEMDIE 18 /* is terminating due to OOM killer */
> > #define TIF_FREEZE 19
> > #define TIF_RESTORE_SIGMASK 20
> > @@ -86,27 +82,12 @@ void arch_setup_new_exec(void);
> > #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
> > #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
> > #define _TIF_FOREIGN_FPSTATE (1 << TIF_FOREIGN_FPSTATE)
> > -#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
> > -#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
> > -#define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
> > -#define _TIF_SECCOMP (1 << TIF_SECCOMP)
> > -#define _TIF_SYSCALL_EMU (1 << TIF_SYSCALL_EMU)
> > -#define _TIF_UPROBE (1 << TIF_UPROBE)
> > -#define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP)
> > +#define _TIF_UPROBE (1 << TIF_UPROBE)
> > #define _TIF_32BIT (1 << TIF_32BIT)
> > #define _TIF_SVE (1 << TIF_SVE)
> > #define _TIF_MTE_ASYNC_FAULT (1 << TIF_MTE_ASYNC_FAULT)
> > #define _TIF_NOTIFY_SIGNAL (1 << TIF_NOTIFY_SIGNAL)
> >
> > -#define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
> > - _TIF_NOTIFY_RESUME | _TIF_FOREIGN_FPSTATE | \
> > - _TIF_UPROBE | _TIF_MTE_ASYNC_FAULT | \
> > - _TIF_NOTIFY_SIGNAL)
> > -
> > -#define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
> > - _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP | \
> > - _TIF_SYSCALL_EMU)
> > -
> > #ifdef CONFIG_SHADOW_CALL_STACK
> > #define INIT_SCS \
> > .scs_base = init_shadow_call_stack, \
> > diff --git a/arch/arm64/kernel/entry-common.c b/arch/arm64/kernel/entry-common.c
> > index b77a15955f28..ac61aeb93933 100644
> > --- a/arch/arm64/kernel/entry-common.c
> > +++ b/arch/arm64/kernel/entry-common.c
> > @@ -14,6 +14,7 @@
> > #include <linux/sched.h>
> > #include <linux/sched/debug.h>
> > #include <linux/thread_info.h>
> > +#include <linux/entry-common.h>
> >
> > #include <asm/cpufeature.h>
> > #include <asm/daifflags.h>
> > @@ -28,201 +29,15 @@
> > #include <asm/sysreg.h>
> > #include <asm/system_misc.h>
> >
> > -/*
> > - * Handle IRQ/context state management when entering from kernel mode.
> > - * Before this function is called it is not safe to call regular kernel code,
> > - * instrumentable code, or any code which may trigger an exception.
> > - *
> > - * This is intended to match the logic in irqentry_enter(), handling the kernel
> > - * mode transitions only.
> > - */
> > -static __always_inline void __enter_from_kernel_mode(struct pt_regs *regs)
> > -{
> > - regs->exit_rcu = false;
> > -
> > - if (!IS_ENABLED(CONFIG_TINY_RCU) && is_idle_task(current)) {
> > - lockdep_hardirqs_off(CALLER_ADDR0);
> > - ct_irq_enter();
> > - trace_hardirqs_off_finish();
> > -
> > - regs->exit_rcu = true;
> > - return;
> > - }
> > -
> > - lockdep_hardirqs_off(CALLER_ADDR0);
> > - rcu_irq_enter_check_tick();
> > - trace_hardirqs_off_finish();
> > -}
> > -
> > -static void noinstr enter_from_kernel_mode(struct pt_regs *regs)
> > -{
> > - __enter_from_kernel_mode(regs);
> > - mte_check_tfsr_entry();
> > - mte_disable_tco_entry(current);
> > -}
> > -
> > -/*
> > - * Handle IRQ/context state management when exiting to kernel mode.
> > - * After this function returns it is not safe to call regular kernel code,
> > - * instrumentable code, or any code which may trigger an exception.
> > - *
> > - * This is intended to match the logic in irqentry_exit(), handling the kernel
> > - * mode transitions only, and with preemption handled elsewhere.
> > - */
> > -static __always_inline void __exit_to_kernel_mode(struct pt_regs *regs)
> > -{
> > - lockdep_assert_irqs_disabled();
> > -
> > - if (interrupts_enabled(regs)) {
> > - if (regs->exit_rcu) {
> > - trace_hardirqs_on_prepare();
> > - lockdep_hardirqs_on_prepare();
> > - ct_irq_exit();
> > - lockdep_hardirqs_on(CALLER_ADDR0);
> > - return;
> > - }
> > -
> > - trace_hardirqs_on();
> > - } else {
> > - if (regs->exit_rcu)
> > - ct_irq_exit();
> > - }
> > -}
> > -
> > -static void noinstr exit_to_kernel_mode(struct pt_regs *regs)
> > -{
> > - mte_check_tfsr_exit();
> > - __exit_to_kernel_mode(regs);
> > -}
> > -
> > -/*
> > - * Handle IRQ/context state management when entering from user mode.
> > - * Before this function is called it is not safe to call regular kernel code,
> > - * instrumentable code, or any code which may trigger an exception.
> > - */
> > -static __always_inline void __enter_from_user_mode(void)
> > +static __always_inline void exit_to_user_mode_wrapper(struct pt_regs *regs)
> > {
> > - lockdep_hardirqs_off(CALLER_ADDR0);
> > - CT_WARN_ON(ct_state() != CONTEXT_USER);
> > - user_exit_irqoff();
> > - trace_hardirqs_off_finish();
> > - mte_disable_tco_entry(current);
> > -}
> > -
> > -static __always_inline void enter_from_user_mode(struct pt_regs *regs)
> > -{
> > - __enter_from_user_mode();
> > -}
> > -
> > -/*
> > - * Handle IRQ/context state management when exiting to user mode.
> > - * After this function returns it is not safe to call regular kernel code,
> > - * instrumentable code, or any code which may trigger an exception.
> > - */
> > -static __always_inline void __exit_to_user_mode(void)
> > -{
> > - trace_hardirqs_on_prepare();
> > - lockdep_hardirqs_on_prepare();
> > - user_enter_irqoff();
> > - lockdep_hardirqs_on(CALLER_ADDR0);
> > -}
> > -
> > -static void do_notify_resume(struct pt_regs *regs, unsigned long thread_flags)
> > -{
> > - do {
> > - local_irq_enable();
> > -
> > - if (thread_flags & _TIF_NEED_RESCHED)
> > - schedule();
> > -
> > - if (thread_flags & _TIF_UPROBE)
> > - uprobe_notify_resume(regs);
> > -
> > - if (thread_flags & _TIF_MTE_ASYNC_FAULT) {
> > - clear_thread_flag(TIF_MTE_ASYNC_FAULT);
> > - send_sig_fault(SIGSEGV, SEGV_MTEAERR,
> > - (void __user *)NULL, current);
> > - }
> > -
> > - if (thread_flags & (_TIF_SIGPENDING | _TIF_NOTIFY_SIGNAL))
> > - do_signal(regs);
> > -
> > - if (thread_flags & _TIF_NOTIFY_RESUME)
> > - resume_user_mode_work(regs);
> > -
> > - if (thread_flags & _TIF_FOREIGN_FPSTATE)
> > - fpsimd_restore_current_state();
> > -
> > - local_irq_disable();
> > - thread_flags = read_thread_flags();
> > - } while (thread_flags & _TIF_WORK_MASK);
> > -}
> > -
> > -static __always_inline void exit_to_user_mode_prepare(struct pt_regs *regs)
> > -{
> > - unsigned long flags;
> > -
> > local_irq_disable();
> > -
> > - flags = read_thread_flags();
> > - if (unlikely(flags & _TIF_WORK_MASK))
> > - do_notify_resume(regs, flags);
> > -
> > - local_daif_mask();
> > -
> > - lockdep_sys_exit();
> > -}
> > -
> > -static __always_inline void exit_to_user_mode(struct pt_regs *regs)
> > -{
> > - exit_to_user_mode_prepare(regs);
> > - mte_check_tfsr_exit();
> > - __exit_to_user_mode();
> > + irqentry_exit_to_user_mode(regs);
> > }
> >
> > asmlinkage void noinstr asm_exit_to_user_mode(struct pt_regs *regs)
> > {
> > - exit_to_user_mode(regs);
> > -}
> > -
> > -/*
> > - * Handle IRQ/context state management when entering an NMI from user/kernel
> > - * mode. Before this function is called it is not safe to call regular kernel
> > - * code, instrumentable code, or any code which may trigger an exception.
> > - */
> > -static void noinstr arm64_enter_nmi(struct pt_regs *regs)
> > -{
> > - regs->lockdep_hardirqs = lockdep_hardirqs_enabled();
> > -
> > - __nmi_enter();
> > - lockdep_hardirqs_off(CALLER_ADDR0);
> > - lockdep_hardirq_enter();
> > - ct_nmi_enter();
> > -
> > - trace_hardirqs_off_finish();
> > - ftrace_nmi_enter();
> > -}
> > -
> > -/*
> > - * Handle IRQ/context state management when exiting an NMI from user/kernel
> > - * mode. After this function returns it is not safe to call regular kernel
> > - * code, instrumentable code, or any code which may trigger an exception.
> > - */
> > -static void noinstr arm64_exit_nmi(struct pt_regs *regs)
> > -{
> > - bool restore = regs->lockdep_hardirqs;
> > -
> > - ftrace_nmi_exit();
> > - if (restore) {
> > - trace_hardirqs_on_prepare();
> > - lockdep_hardirqs_on_prepare();
> > - }
> > -
> > - ct_nmi_exit();
> > - lockdep_hardirq_exit();
> > - if (restore)
> > - lockdep_hardirqs_on(CALLER_ADDR0);
> > - __nmi_exit();
> > + exit_to_user_mode_wrapper(regs);
> > }
> >
> > /*
> > @@ -259,48 +74,6 @@ static void noinstr arm64_exit_el1_dbg(struct pt_regs *regs)
> > lockdep_hardirqs_on(CALLER_ADDR0);
> > }
> >
> > -#ifdef CONFIG_PREEMPT_DYNAMIC
> > -DEFINE_STATIC_KEY_TRUE(sk_dynamic_irqentry_exit_cond_resched);
> > -#define need_irq_preemption() \
> > - (static_branch_unlikely(&sk_dynamic_irqentry_exit_cond_resched))
> > -#else
> > -#define need_irq_preemption() (IS_ENABLED(CONFIG_PREEMPTION))
> > -#endif
> > -
> > -static void __sched arm64_preempt_schedule_irq(void)
> > -{
> > - if (!need_irq_preemption())
> > - return;
> > -
> > - /*
> > - * Note: thread_info::preempt_count includes both thread_info::count
> > - * and thread_info::need_resched, and is not equivalent to
> > - * preempt_count().
> > - */
> > - if (READ_ONCE(current_thread_info()->preempt_count) != 0)
> > - return;
> > -
> > - /*
> > - * DAIF.DA are cleared at the start of IRQ/FIQ handling, and when GIC
> > - * priority masking is used the GIC irqchip driver will clear DAIF.IF
> > - * using gic_arch_enable_irqs() for normal IRQs. If anything is set in
> > - * DAIF we must have handled an NMI, so skip preemption.
> > - */
> > - if (system_uses_irq_prio_masking() && read_sysreg(daif))
> > - return;
> > -
> > - /*
> > - * Preempting a task from an IRQ means we leave copies of PSTATE
> > - * on the stack. cpufeature's enable calls may modify PSTATE, but
> > - * resuming one of these preempted tasks would undo those changes.
> > - *
> > - * Only allow a task to be preempted once cpufeatures have been
> > - * enabled.
> > - */
> > - if (system_capabilities_finalized())
> > - preempt_schedule_irq();
> > -}
> > -
> > static void do_interrupt_handler(struct pt_regs *regs,
> > void (*handler)(struct pt_regs *))
> > {
> > @@ -320,7 +93,7 @@ extern void (*handle_arch_fiq)(struct pt_regs *);
> > static void noinstr __panic_unhandled(struct pt_regs *regs, const char *vector,
> > unsigned long esr)
> > {
> > - arm64_enter_nmi(regs);
> > + irqentry_nmi_enter(regs);
> >
> > console_verbose();
> >
> > @@ -426,41 +199,43 @@ UNHANDLED(el1t, 64, error)
> > static void noinstr el1_abort(struct pt_regs *regs, unsigned long esr)
> > {
> > unsigned long far = read_sysreg(far_el1);
> > + irqentry_state_t state = irqentry_enter(regs);
> >
> > - enter_from_kernel_mode(regs);
> > local_daif_inherit(regs);
> > do_mem_abort(far, esr, regs);
> > local_daif_mask();
> > - exit_to_kernel_mode(regs);
> > + irqentry_exit(regs, state);
> > }
> >
> > static void noinstr el1_pc(struct pt_regs *regs, unsigned long esr)
> > {
> > unsigned long far = read_sysreg(far_el1);
> > + irqentry_state_t state = irqentry_enter(regs);
> >
> > - enter_from_kernel_mode(regs);
> > local_daif_inherit(regs);
> > do_sp_pc_abort(far, esr, regs);
> > local_daif_mask();
> > - exit_to_kernel_mode(regs);
> > + irqentry_exit(regs, state);
> > }
> >
> > static void noinstr el1_undef(struct pt_regs *regs, unsigned long esr)
> > {
> > - enter_from_kernel_mode(regs);
> > + irqentry_state_t state = irqentry_enter(regs);
> > +
> > local_daif_inherit(regs);
> > do_el1_undef(regs, esr);
> > local_daif_mask();
> > - exit_to_kernel_mode(regs);
> > + irqentry_exit(regs, state);
> > }
> >
> > static void noinstr el1_bti(struct pt_regs *regs, unsigned long esr)
> > {
> > - enter_from_kernel_mode(regs);
> > + irqentry_state_t state = irqentry_enter(regs);
> > +
> > local_daif_inherit(regs);
> > do_el1_bti(regs, esr);
> > local_daif_mask();
> > - exit_to_kernel_mode(regs);
> > + irqentry_exit(regs, state);
> > }
> >
> > static void noinstr el1_dbg(struct pt_regs *regs, unsigned long esr)
> > @@ -475,11 +250,12 @@ static void noinstr el1_dbg(struct pt_regs *regs, unsigned long esr)
> >
> > static void noinstr el1_fpac(struct pt_regs *regs, unsigned long esr)
> > {
> > - enter_from_kernel_mode(regs);
> > + irqentry_state_t state = irqentry_enter(regs);
> > +
> > local_daif_inherit(regs);
> > do_el1_fpac(regs, esr);
> > local_daif_mask();
> > - exit_to_kernel_mode(regs);
> > + irqentry_exit(regs, state);
> > }
> >
> > asmlinkage void noinstr el1h_64_sync_handler(struct pt_regs *regs)
> > @@ -522,23 +298,22 @@ asmlinkage void noinstr el1h_64_sync_handler(struct pt_regs *regs)
> > static __always_inline void __el1_pnmi(struct pt_regs *regs,
> > void (*handler)(struct pt_regs *))
> > {
> > - arm64_enter_nmi(regs);
> > + irqentry_state_t state = irqentry_nmi_enter(regs);
> > +
> > do_interrupt_handler(regs, handler);
> > - arm64_exit_nmi(regs);
> > + irqentry_nmi_exit(regs, state);
> > }
> >
> > static __always_inline void __el1_irq(struct pt_regs *regs,
> > void (*handler)(struct pt_regs *))
> > {
> > - enter_from_kernel_mode(regs);
> > + irqentry_state_t state = irqentry_enter(regs);
> >
> > irq_enter_rcu();
> > do_interrupt_handler(regs, handler);
> > irq_exit_rcu();
> >
> > - arm64_preempt_schedule_irq();
> > -
> > - exit_to_kernel_mode(regs);
> > + irqentry_exit(regs, state);
> > }
> > static void noinstr el1_interrupt(struct pt_regs *regs,
> > void (*handler)(struct pt_regs *))
> > @@ -564,21 +339,22 @@ asmlinkage void noinstr el1h_64_fiq_handler(struct pt_regs *regs)
> > asmlinkage void noinstr el1h_64_error_handler(struct pt_regs *regs)
> > {
> > unsigned long esr = read_sysreg(esr_el1);
> > + irqentry_state_t state;
> >
> > local_daif_restore(DAIF_ERRCTX);
> > - arm64_enter_nmi(regs);
> > + state = irqentry_nmi_enter(regs);
> > do_serror(regs, esr);
> > - arm64_exit_nmi(regs);
> > + irqentry_nmi_exit(regs, state);
> > }
> >
> > static void noinstr el0_da(struct pt_regs *regs, unsigned long esr)
> > {
> > unsigned long far = read_sysreg(far_el1);
> >
> > - enter_from_user_mode(regs);
> > + irqentry_enter_from_user_mode(regs);
> > local_daif_restore(DAIF_PROCCTX);
> > do_mem_abort(far, esr, regs);
> > - exit_to_user_mode(regs);
> > + exit_to_user_mode_wrapper(regs);
> > }
> >
> > static void noinstr el0_ia(struct pt_regs *regs, unsigned long esr)
> > @@ -593,50 +369,50 @@ static void noinstr el0_ia(struct pt_regs *regs, unsigned long esr)
> > if (!is_ttbr0_addr(far))
> > arm64_apply_bp_hardening();
> >
> > - enter_from_user_mode(regs);
> > + irqentry_enter_from_user_mode(regs);
> > local_daif_restore(DAIF_PROCCTX);
> > do_mem_abort(far, esr, regs);
> > - exit_to_user_mode(regs);
> > + exit_to_user_mode_wrapper(regs);
> > }
> >
> > static void noinstr el0_fpsimd_acc(struct pt_regs *regs, unsigned long esr)
> > {
> > - enter_from_user_mode(regs);
> > + irqentry_enter_from_user_mode(regs);
> > local_daif_restore(DAIF_PROCCTX);
> > do_fpsimd_acc(esr, regs);
> > - exit_to_user_mode(regs);
> > + exit_to_user_mode_wrapper(regs);
> > }
> >
> > static void noinstr el0_sve_acc(struct pt_regs *regs, unsigned long esr)
> > {
> > - enter_from_user_mode(regs);
> > + irqentry_enter_from_user_mode(regs);
> > local_daif_restore(DAIF_PROCCTX);
> > do_sve_acc(esr, regs);
> > - exit_to_user_mode(regs);
> > + exit_to_user_mode_wrapper(regs);
> > }
> >
> > static void noinstr el0_sme_acc(struct pt_regs *regs, unsigned long esr)
> > {
> > - enter_from_user_mode(regs);
> > + irqentry_enter_from_user_mode(regs);
> > local_daif_restore(DAIF_PROCCTX);
> > do_sme_acc(esr, regs);
> > - exit_to_user_mode(regs);
> > + exit_to_user_mode_wrapper(regs);
> > }
> >
> > static void noinstr el0_fpsimd_exc(struct pt_regs *regs, unsigned long esr)
> > {
> > - enter_from_user_mode(regs);
> > + irqentry_enter_from_user_mode(regs);
> > local_daif_restore(DAIF_PROCCTX);
> > do_fpsimd_exc(esr, regs);
> > - exit_to_user_mode(regs);
> > + exit_to_user_mode_wrapper(regs);
> > }
> >
> > static void noinstr el0_sys(struct pt_regs *regs, unsigned long esr)
> > {
> > - enter_from_user_mode(regs);
> > + irqentry_enter_from_user_mode(regs);
> > local_daif_restore(DAIF_PROCCTX);
> > do_el0_sys(esr, regs);
> > - exit_to_user_mode(regs);
> > + exit_to_user_mode_wrapper(regs);
> > }
> >
> > static void noinstr el0_pc(struct pt_regs *regs, unsigned long esr)
> > @@ -646,50 +422,50 @@ static void noinstr el0_pc(struct pt_regs *regs, unsigned long esr)
> > if (!is_ttbr0_addr(instruction_pointer(regs)))
> > arm64_apply_bp_hardening();
> >
> > - enter_from_user_mode(regs);
> > + irqentry_enter_from_user_mode(regs);
> > local_daif_restore(DAIF_PROCCTX);
> > do_sp_pc_abort(far, esr, regs);
> > - exit_to_user_mode(regs);
> > + exit_to_user_mode_wrapper(regs);
> > }
> >
> > static void noinstr el0_sp(struct pt_regs *regs, unsigned long esr)
> > {
> > - enter_from_user_mode(regs);
> > + irqentry_enter_from_user_mode(regs);
> > local_daif_restore(DAIF_PROCCTX);
> > do_sp_pc_abort(regs->sp, esr, regs);
> > - exit_to_user_mode(regs);
> > + exit_to_user_mode_wrapper(regs);
> > }
> >
> > static void noinstr el0_undef(struct pt_regs *regs, unsigned long esr)
> > {
> > - enter_from_user_mode(regs);
> > + irqentry_enter_from_user_mode(regs);
> > local_daif_restore(DAIF_PROCCTX);
> > do_el0_undef(regs, esr);
> > - exit_to_user_mode(regs);
> > + exit_to_user_mode_wrapper(regs);
> > }
> >
> > static void noinstr el0_bti(struct pt_regs *regs)
> > {
> > - enter_from_user_mode(regs);
> > + irqentry_enter_from_user_mode(regs);
> > local_daif_restore(DAIF_PROCCTX);
> > do_el0_bti(regs);
> > - exit_to_user_mode(regs);
> > + exit_to_user_mode_wrapper(regs);
> > }
> >
> > static void noinstr el0_mops(struct pt_regs *regs, unsigned long esr)
> > {
> > - enter_from_user_mode(regs);
> > + irqentry_enter_from_user_mode(regs);
> > local_daif_restore(DAIF_PROCCTX);
> > do_el0_mops(regs, esr);
> > - exit_to_user_mode(regs);
> > + exit_to_user_mode_wrapper(regs);
> > }
> >
> > static void noinstr el0_inv(struct pt_regs *regs, unsigned long esr)
> > {
> > - enter_from_user_mode(regs);
> > + irqentry_enter_from_user_mode(regs);
> > local_daif_restore(DAIF_PROCCTX);
> > bad_el0_sync(regs, 0, esr);
> > - exit_to_user_mode(regs);
> > + exit_to_user_mode_wrapper(regs);
> > }
> >
> > static void noinstr el0_dbg(struct pt_regs *regs, unsigned long esr)
> > @@ -697,28 +473,28 @@ static void noinstr el0_dbg(struct pt_regs *regs, unsigned long esr)
> > /* Only watchpoints write FAR_EL1, otherwise its UNKNOWN */
> > unsigned long far = read_sysreg(far_el1);
> >
> > - enter_from_user_mode(regs);
> > + irqentry_enter_from_user_mode(regs);
> > do_debug_exception(far, esr, regs);
> > local_daif_restore(DAIF_PROCCTX);
> > - exit_to_user_mode(regs);
> > + exit_to_user_mode_wrapper(regs);
> > }
> >
> > static void noinstr el0_svc(struct pt_regs *regs)
> > {
> > - enter_from_user_mode(regs);
> > + irqentry_enter_from_user_mode(regs);
> > cortex_a76_erratum_1463225_svc_handler();
> > fp_user_discard();
> > local_daif_restore(DAIF_PROCCTX);
> > do_el0_svc(regs);
> > - exit_to_user_mode(regs);
> > + exit_to_user_mode_wrapper(regs);
> > }
> >
> > static void noinstr el0_fpac(struct pt_regs *regs, unsigned long esr)
> > {
> > - enter_from_user_mode(regs);
> > + irqentry_enter_from_user_mode(regs);
> > local_daif_restore(DAIF_PROCCTX);
> > do_el0_fpac(regs, esr);
> > - exit_to_user_mode(regs);
> > + exit_to_user_mode_wrapper(regs);
> > }
> >
> > asmlinkage void noinstr el0t_64_sync_handler(struct pt_regs *regs)
> > @@ -783,7 +559,7 @@ asmlinkage void noinstr el0t_64_sync_handler(struct pt_regs *regs)
> > static void noinstr el0_interrupt(struct pt_regs *regs,
> > void (*handler)(struct pt_regs *))
> > {
> > - enter_from_user_mode(regs);
> > + irqentry_enter_from_user_mode(regs);
> >
> > write_sysreg(DAIF_PROCCTX_NOIRQ, daif);
> >
> > @@ -794,7 +570,7 @@ static void noinstr el0_interrupt(struct pt_regs *regs,
> > do_interrupt_handler(regs, handler);
> > irq_exit_rcu();
> >
> > - exit_to_user_mode(regs);
> > + exit_to_user_mode_wrapper(regs);
> > }
> >
> > static void noinstr __el0_irq_handler_common(struct pt_regs *regs)
> > @@ -820,14 +596,15 @@ asmlinkage void noinstr el0t_64_fiq_handler(struct pt_regs *regs)
> > static void noinstr __el0_error_handler_common(struct pt_regs *regs)
> > {
> > unsigned long esr = read_sysreg(esr_el1);
> > + irqentry_state_t state_nmi;
> >
> > - enter_from_user_mode(regs);
> > + irqentry_enter_from_user_mode(regs);
> > local_daif_restore(DAIF_ERRCTX);
> > - arm64_enter_nmi(regs);
> > + state_nmi = irqentry_nmi_enter(regs);
> > do_serror(regs, esr);
> > - arm64_exit_nmi(regs);
> > + irqentry_nmi_exit(regs, state_nmi);
> > local_daif_restore(DAIF_PROCCTX);
> > - exit_to_user_mode(regs);
> > + exit_to_user_mode_wrapper(regs);
> > }
> >
> > asmlinkage void noinstr el0t_64_error_handler(struct pt_regs *regs)
> > @@ -838,19 +615,19 @@ asmlinkage void noinstr el0t_64_error_handler(struct pt_regs *regs)
> > #ifdef CONFIG_COMPAT
> > static void noinstr el0_cp15(struct pt_regs *regs, unsigned long esr)
> > {
> > - enter_from_user_mode(regs);
> > + irqentry_enter_from_user_mode(regs);
> > local_daif_restore(DAIF_PROCCTX);
> > do_el0_cp15(esr, regs);
> > - exit_to_user_mode(regs);
> > + exit_to_user_mode_wrapper(regs);
> > }
> >
> > static void noinstr el0_svc_compat(struct pt_regs *regs)
> > {
> > - enter_from_user_mode(regs);
> > + irqentry_enter_from_user_mode(regs);
> > cortex_a76_erratum_1463225_svc_handler();
> > local_daif_restore(DAIF_PROCCTX);
> > do_el0_svc_compat(regs);
> > - exit_to_user_mode(regs);
> > + exit_to_user_mode_wrapper(regs);
> > }
> >
> > asmlinkage void noinstr el0t_32_sync_handler(struct pt_regs *regs)
> > @@ -924,7 +701,7 @@ asmlinkage void noinstr __noreturn handle_bad_stack(struct pt_regs *regs)
> > unsigned long esr = read_sysreg(esr_el1);
> > unsigned long far = read_sysreg(far_el1);
> >
> > - arm64_enter_nmi(regs);
> > + irqentry_nmi_enter(regs);
> > panic_bad_stack(regs, esr, far);
> > }
> > #endif /* CONFIG_VMAP_STACK */
> > @@ -933,6 +710,7 @@ asmlinkage void noinstr __noreturn handle_bad_stack(struct pt_regs *regs)
> > asmlinkage noinstr unsigned long
> > __sdei_handler(struct pt_regs *regs, struct sdei_registered_event *arg)
> > {
> > + irqentry_state_t state;
> > unsigned long ret;
> >
> > /*
> > @@ -957,9 +735,9 @@ __sdei_handler(struct pt_regs *regs, struct sdei_registered_event *arg)
> > else if (cpu_has_pan())
> > set_pstate_pan(0);
> >
> > - arm64_enter_nmi(regs);
> > + state = irqentry_nmi_enter(regs);
> > ret = do_sdei_event(regs, arg);
> > - arm64_exit_nmi(regs);
> > + irqentry_nmi_exit(regs, state);
> >
> > return ret;
> > }
> > diff --git a/arch/arm64/kernel/ptrace.c b/arch/arm64/kernel/ptrace.c
> > index 60fd85d5119d..9cc0f450fa76 100644
> > --- a/arch/arm64/kernel/ptrace.c
> > +++ b/arch/arm64/kernel/ptrace.c
> > @@ -41,9 +41,6 @@
> > #include <asm/traps.h>
> > #include <asm/system_misc.h>
> >
> > -#define CREATE_TRACE_POINTS
> > -#include <trace/events/syscalls.h>
> > -
> > struct pt_regs_offset {
> > const char *name;
> > int offset;
> > @@ -2179,104 +2176,6 @@ long arch_ptrace(struct task_struct *child, long request,
> > return ptrace_request(child, request, addr, data);
> > }
> >
> > -enum ptrace_syscall_dir {
> > - PTRACE_SYSCALL_ENTER = 0,
> > - PTRACE_SYSCALL_EXIT,
> > -};
> > -
> > -static void report_syscall_enter(struct pt_regs *regs)
> > -{
> > - int regno;
> > - unsigned long saved_reg;
> > -
> > - /*
> > - * We have some ABI weirdness here in the way that we handle syscall
> > - * exit stops because we indicate whether or not the stop has been
> > - * signalled from syscall entry or syscall exit by clobbering a general
> > - * purpose register (ip/r12 for AArch32, x7 for AArch64) in the tracee
> > - * and restoring its old value after the stop. This means that:
> > - *
> > - * - Any writes by the tracer to this register during the stop are
> > - * ignored/discarded.
> > - *
> > - * - The actual value of the register is not available during the stop,
> > - * so the tracer cannot save it and restore it later.
> > - *
> > - * - Syscall stops behave differently to seccomp and pseudo-step traps
> > - * (the latter do not nobble any registers).
> > - */
> > - regno = (is_compat_task() ? 12 : 7);
> > - saved_reg = regs->regs[regno];
> > - regs->regs[regno] = PTRACE_SYSCALL_ENTER;
> > -
> > - if (ptrace_report_syscall_entry(regs))
> > - forget_syscall(regs);
> > - regs->regs[regno] = saved_reg;
> > -}
> > -
> > -static void report_syscall_exit(struct pt_regs *regs)
> > -{
> > - int regno;
> > - unsigned long saved_reg;
> > -
> > - /* See comment for report_syscall_enter() */
> > - regno = (is_compat_task() ? 12 : 7);
> > - saved_reg = regs->regs[regno];
> > - regs->regs[regno] = PTRACE_SYSCALL_EXIT;
> > -
> > - if (!test_thread_flag(TIF_SINGLESTEP)) {
> > - ptrace_report_syscall_exit(regs, 0);
> > - regs->regs[regno] = saved_reg;
> > - } else {
> > - regs->regs[regno] = saved_reg;
> > -
> > - /*
> > - * Signal a pseudo-step exception since we are stepping but
> > - * tracer modifications to the registers may have rewound the
> > - * state machine.
> > - */
> > - ptrace_report_syscall_exit(regs, 1);
> > - }
> > -}
> > -
> > -int syscall_trace_enter(struct pt_regs *regs)
> > -{
> > - unsigned long flags = read_thread_flags();
> > -
> > - if (flags & (_TIF_SYSCALL_EMU | _TIF_SYSCALL_TRACE)) {
> > - report_syscall_enter(regs);
> > - if (flags & _TIF_SYSCALL_EMU)
> > - return NO_SYSCALL;
> > - }
> > -
> > - /* Do the secure computing after ptrace; failures should be fast. */
> > - if (secure_computing() == -1)
> > - return NO_SYSCALL;
> > -
> > - if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
> > - trace_sys_enter(regs, regs->syscallno);
> > -
> > - audit_syscall_entry(regs->syscallno, regs->orig_x0, regs->regs[1],
> > - regs->regs[2], regs->regs[3]);
> > -
> > - return regs->syscallno;
> > -}
> > -
> > -void syscall_trace_exit(struct pt_regs *regs)
> > -{
> > - unsigned long flags = read_thread_flags();
> > -
> > - audit_syscall_exit(regs);
> > -
> > - if (flags & _TIF_SYSCALL_TRACEPOINT)
> > - trace_sys_exit(regs, syscall_get_return_value(current, regs));
> > -
> > - if (flags & (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP))
> > - report_syscall_exit(regs);
> > -
> > - rseq_syscall(regs);
> > -}
> > -
> > /*
> > * SPSR_ELx bits which are always architecturally RES0 per ARM DDI 0487D.a.
> > * We permit userspace to set SSBS (AArch64 bit 12, AArch32 bit 23) which is
> > diff --git a/arch/arm64/kernel/signal.c b/arch/arm64/kernel/signal.c
> > index 4a77f4976e11..2982f6db6d96 100644
> > --- a/arch/arm64/kernel/signal.c
> > +++ b/arch/arm64/kernel/signal.c
> > @@ -19,6 +19,7 @@
> > #include <linux/ratelimit.h>
> > #include <linux/rseq.h>
> > #include <linux/syscalls.h>
> > +#include <linux/entry-common.h>
> >
> > #include <asm/daifflags.h>
> > #include <asm/debug-monitors.h>
> > @@ -1266,7 +1267,7 @@ static void handle_signal(struct ksignal *ksig, struct pt_regs *regs)
> > * the kernel can handle, and then we build all the user-level signal handling
> > * stack-frames in one go after that.
> > */
> > -void do_signal(struct pt_regs *regs)
> > +void arch_do_signal_or_restart(struct pt_regs *regs)
> > {
> > unsigned long continue_addr = 0, restart_addr = 0;
> > int retval = 0;
> > diff --git a/arch/arm64/kernel/syscall.c b/arch/arm64/kernel/syscall.c
> > index ad198262b981..160ac9d15c27 100644
> > --- a/arch/arm64/kernel/syscall.c
> > +++ b/arch/arm64/kernel/syscall.c
> > @@ -7,6 +7,7 @@
> > #include <linux/ptrace.h>
> > #include <linux/randomize_kstack.h>
> > #include <linux/syscalls.h>
> > +#include <linux/entry-common.h>
> >
> > #include <asm/debug-monitors.h>
> > #include <asm/exception.h>
> > @@ -66,14 +67,15 @@ static void invoke_syscall(struct pt_regs *regs, unsigned int scno,
> > choose_random_kstack_offset(get_random_u16() & 0x1FF);
> > }
> >
> > -static inline bool has_syscall_work(unsigned long flags)
> > +static inline bool has_syscall_work(unsigned long work)
> > {
> > - return unlikely(flags & _TIF_SYSCALL_WORK);
> > + return unlikely(work & SYSCALL_WORK_ENTER);
> > }
> >
> > static void el0_svc_common(struct pt_regs *regs, int scno, int sc_nr,
> > const syscall_fn_t syscall_table[])
> > {
> > + unsigned long work = READ_ONCE(current_thread_info()->syscall_work);
> > unsigned long flags = read_thread_flags();
> >
> > regs->orig_x0 = regs->regs[0];
> > @@ -107,7 +109,7 @@ static void el0_svc_common(struct pt_regs *regs, int scno, int sc_nr,
> > return;
> > }
> >
> > - if (has_syscall_work(flags)) {
> > + if (has_syscall_work(work)) {
> > /*
> > * The de-facto standard way to skip a system call using ptrace
> > * is to set the system call to -1 (NO_SYSCALL) and set x0 to a
> > @@ -125,7 +127,7 @@ 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, regs->syscallno, work);
> > if (scno == NO_SYSCALL)
> > goto trace_exit;
> > }
> > @@ -137,14 +139,14 @@ static void el0_svc_common(struct pt_regs *regs, int scno, int sc_nr,
> > * check again. However, if we were tracing entry, then we always trace
> > * exit regardless, as the old entry assembly did.
> > */
> > - if (!has_syscall_work(flags) && !IS_ENABLED(CONFIG_DEBUG_RSEQ)) {
> > - flags = read_thread_flags();
> > - if (!has_syscall_work(flags) && !(flags & _TIF_SINGLESTEP))
> > + if (!has_syscall_work(work) && !IS_ENABLED(CONFIG_DEBUG_RSEQ)) {
> > + work = READ_ONCE(current_thread_info()->syscall_work);
> > + if (!has_syscall_work(work) && !report_single_step(work))
> > return;
> > }
> >
> > trace_exit:
> > - syscall_trace_exit(regs);
> > + syscall_exit_work(regs, work);
> > }
> >
> > void do_el0_svc(struct pt_regs *regs)
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