#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,
+ * intrumentable 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 void noinstr enter_from_kernel_mode(struct pt_regs *regs)
+static __always_inline void __enter_from_kernel_mode(struct pt_regs *regs)
{
regs->exit_rcu = false;
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();
}
/*
+ * Handle IRQ/context state management when exiting to kernel mode.
+ * After this function returns it is not safe to call regular kernel code,
+ * intrumentable 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 void noinstr exit_to_kernel_mode(struct pt_regs *regs)
+static __always_inline void __exit_to_kernel_mode(struct pt_regs *regs)
{
lockdep_assert_irqs_disabled();
- mte_check_tfsr_exit();
-
if (interrupts_enabled(regs)) {
if (regs->exit_rcu) {
trace_hardirqs_on_prepare();
}
}
+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,
+ * intrumentable code, or any code which may trigger an exception.
+ */
+static __always_inline void __enter_from_user_mode(void)
+{
+ lockdep_hardirqs_off(CALLER_ADDR0);
+ CT_WARN_ON(ct_state() != CONTEXT_USER);
+ user_exit_irqoff();
+ trace_hardirqs_off_finish();
+}
+
+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,
+ * intrumentable 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(CALLER_ADDR0);
+ user_enter_irqoff();
+ lockdep_hardirqs_on(CALLER_ADDR0);
+}
+
+static __always_inline void prepare_exit_to_user_mode(struct pt_regs *regs)
+{
+ unsigned long flags;
+
+ local_daif_mask();
+
+ flags = READ_ONCE(current_thread_info()->flags);
+ if (unlikely(flags & _TIF_WORK_MASK))
+ do_notify_resume(regs, flags);
+}
+
+static __always_inline void exit_to_user_mode(struct pt_regs *regs)
+{
+ prepare_exit_to_user_mode(regs);
+ mte_check_tfsr_exit();
+ __exit_to_user_mode();
+}
+
+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, intrumentable 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();
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, intrumentable code, or any code which may trigger an exception.
+ */
static void noinstr arm64_exit_nmi(struct pt_regs *regs)
{
bool restore = regs->lockdep_hardirqs;
__nmi_exit();
}
+/*
+ * Handle IRQ/context state management when entering a debug exception from
+ * kernel mode. Before this function is called it is not safe to call regular
+ * kernel code, intrumentable code, or any code which may trigger an exception.
+ */
+static void noinstr arm64_enter_el1_dbg(struct pt_regs *regs)
+{
+ regs->lockdep_hardirqs = lockdep_hardirqs_enabled();
+
+ lockdep_hardirqs_off(CALLER_ADDR0);
+ rcu_nmi_enter();
+
+ trace_hardirqs_off_finish();
+}
+
+/*
+ * Handle IRQ/context state management when exiting a debug exception from
+ * kernel mode. After this function returns it is not safe to call regular
+ * kernel code, intrumentable code, or any code which may trigger an exception.
+ */
+static void noinstr arm64_exit_el1_dbg(struct pt_regs *regs)
+{
+ bool restore = regs->lockdep_hardirqs;
+
+ if (restore) {
+ trace_hardirqs_on_prepare();
+ lockdep_hardirqs_on_prepare(CALLER_ADDR0);
+ }
+
+ rcu_nmi_exit();
+ if (restore)
+ lockdep_hardirqs_on(CALLER_ADDR0);
+}
+
static void noinstr enter_el1_irq_or_nmi(struct pt_regs *regs)
{
if (IS_ENABLED(CONFIG_ARM64_PSEUDO_NMI) && !interrupts_enabled(regs))
exit_to_kernel_mode(regs);
}
-static void noinstr arm64_enter_el1_dbg(struct pt_regs *regs)
-{
- regs->lockdep_hardirqs = lockdep_hardirqs_enabled();
-
- lockdep_hardirqs_off(CALLER_ADDR0);
- rcu_nmi_enter();
-
- trace_hardirqs_off_finish();
-}
-
-static void noinstr arm64_exit_el1_dbg(struct pt_regs *regs)
-{
- bool restore = regs->lockdep_hardirqs;
-
- if (restore) {
- trace_hardirqs_on_prepare();
- lockdep_hardirqs_on_prepare(CALLER_ADDR0);
- }
-
- rcu_nmi_exit();
- if (restore)
- lockdep_hardirqs_on(CALLER_ADDR0);
-}
-
static void noinstr el1_dbg(struct pt_regs *regs, unsigned long esr)
{
unsigned long far = read_sysreg(far_el1);
arm64_exit_nmi(regs);
}
-asmlinkage void noinstr enter_from_user_mode(void)
-{
- lockdep_hardirqs_off(CALLER_ADDR0);
- CT_WARN_ON(ct_state() != CONTEXT_USER);
- user_exit_irqoff();
- trace_hardirqs_off_finish();
-}
-
-asmlinkage void noinstr exit_to_user_mode(void)
-{
- mte_check_tfsr_exit();
-
- trace_hardirqs_on_prepare();
- lockdep_hardirqs_on_prepare(CALLER_ADDR0);
- user_enter_irqoff();
- lockdep_hardirqs_on(CALLER_ADDR0);
-}
-
static void noinstr el0_da(struct pt_regs *regs, unsigned long esr)
{
unsigned long far = read_sysreg(far_el1);
- enter_from_user_mode();
+ enter_from_user_mode(regs);
local_daif_restore(DAIF_PROCCTX);
do_mem_abort(far, esr, regs);
+ exit_to_user_mode(regs);
}
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();
+ enter_from_user_mode(regs);
local_daif_restore(DAIF_PROCCTX);
do_mem_abort(far, esr, regs);
+ exit_to_user_mode(regs);
}
static void noinstr el0_fpsimd_acc(struct pt_regs *regs, unsigned long esr)
{
- enter_from_user_mode();
+ enter_from_user_mode(regs);
local_daif_restore(DAIF_PROCCTX);
do_fpsimd_acc(esr, regs);
+ exit_to_user_mode(regs);
}
static void noinstr el0_sve_acc(struct pt_regs *regs, unsigned long esr)
{
- enter_from_user_mode();
+ enter_from_user_mode(regs);
local_daif_restore(DAIF_PROCCTX);
do_sve_acc(esr, regs);
+ exit_to_user_mode(regs);
}
static void noinstr el0_fpsimd_exc(struct pt_regs *regs, unsigned long esr)
{
- enter_from_user_mode();
+ enter_from_user_mode(regs);
local_daif_restore(DAIF_PROCCTX);
do_fpsimd_exc(esr, regs);
+ exit_to_user_mode(regs);
}
static void noinstr el0_sys(struct pt_regs *regs, unsigned long esr)
{
- enter_from_user_mode();
+ enter_from_user_mode(regs);
local_daif_restore(DAIF_PROCCTX);
do_sysinstr(esr, regs);
+ exit_to_user_mode(regs);
}
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();
+ enter_from_user_mode(regs);
local_daif_restore(DAIF_PROCCTX);
do_sp_pc_abort(far, esr, regs);
+ exit_to_user_mode(regs);
}
static void noinstr el0_sp(struct pt_regs *regs, unsigned long esr)
{
- enter_from_user_mode();
+ enter_from_user_mode(regs);
local_daif_restore(DAIF_PROCCTX);
do_sp_pc_abort(regs->sp, esr, regs);
+ exit_to_user_mode(regs);
}
static void noinstr el0_undef(struct pt_regs *regs)
{
- enter_from_user_mode();
+ enter_from_user_mode(regs);
local_daif_restore(DAIF_PROCCTX);
do_undefinstr(regs);
+ exit_to_user_mode(regs);
}
static void noinstr el0_bti(struct pt_regs *regs)
{
- enter_from_user_mode();
+ enter_from_user_mode(regs);
local_daif_restore(DAIF_PROCCTX);
do_bti(regs);
+ exit_to_user_mode(regs);
}
static void noinstr el0_inv(struct pt_regs *regs, unsigned long esr)
{
- enter_from_user_mode();
+ enter_from_user_mode(regs);
local_daif_restore(DAIF_PROCCTX);
bad_el0_sync(regs, 0, esr);
+ exit_to_user_mode(regs);
}
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();
+ enter_from_user_mode(regs);
do_debug_exception(far, esr, regs);
local_daif_restore(DAIF_PROCCTX);
+ exit_to_user_mode(regs);
}
static void noinstr el0_svc(struct pt_regs *regs)
{
- enter_from_user_mode();
+ enter_from_user_mode(regs);
cortex_a76_erratum_1463225_svc_handler();
do_el0_svc(regs);
+ exit_to_user_mode(regs);
}
static void noinstr el0_fpac(struct pt_regs *regs, unsigned long esr)
{
- enter_from_user_mode();
+ enter_from_user_mode(regs);
local_daif_restore(DAIF_PROCCTX);
do_ptrauth_fault(regs, esr);
+ exit_to_user_mode(regs);
}
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();
+ enter_from_user_mode(regs);
write_sysreg(DAIF_PROCCTX_NOIRQ, daif);
arm64_apply_bp_hardening();
do_interrupt_handler(regs, handler);
+
+ exit_to_user_mode(regs);
}
static void noinstr __el0_irq_handler_common(struct pt_regs *regs)
{
unsigned long esr = read_sysreg(esr_el1);
- enter_from_user_mode();
+ enter_from_user_mode(regs);
local_daif_restore(DAIF_ERRCTX);
arm64_enter_nmi(regs);
do_serror(regs, esr);
arm64_exit_nmi(regs);
local_daif_restore(DAIF_PROCCTX);
+ exit_to_user_mode(regs);
}
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();
+ enter_from_user_mode(regs);
local_daif_restore(DAIF_PROCCTX);
do_cp15instr(esr, regs);
+ exit_to_user_mode(regs);
}
static void noinstr el0_svc_compat(struct pt_regs *regs)
{
- enter_from_user_mode();
+ enter_from_user_mode(regs);
cortex_a76_erratum_1463225_svc_handler();
do_el0_svc_compat(regs);
+ exit_to_user_mode(regs);
}
asmlinkage void noinstr el0t_32_sync_handler(struct pt_regs *regs)
projects / linux-2.6-microblaze.git / blobdiff