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142781e1 TG |
1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | #ifndef __LINUX_ENTRYCOMMON_H | |
3 | #define __LINUX_ENTRYCOMMON_H | |
4 | ||
40607ee9 | 5 | #include <linux/static_call_types.h> |
142781e1 TG |
6 | #include <linux/tracehook.h> |
7 | #include <linux/syscalls.h> | |
8 | #include <linux/seccomp.h> | |
9 | #include <linux/sched.h> | |
10 | ||
11 | #include <asm/entry-common.h> | |
12 | ||
13 | /* | |
14 | * Define dummy _TIF work flags if not defined by the architecture or for | |
15 | * disabled functionality. | |
16 | */ | |
a9f3a74a TG |
17 | #ifndef _TIF_PATCH_PENDING |
18 | # define _TIF_PATCH_PENDING (0) | |
19 | #endif | |
20 | ||
21 | #ifndef _TIF_UPROBE | |
22 | # define _TIF_UPROBE (0) | |
23 | #endif | |
24 | ||
142781e1 | 25 | /* |
29915524 | 26 | * SYSCALL_WORK flags handled in syscall_enter_from_user_mode() |
142781e1 | 27 | */ |
29915524 GKB |
28 | #ifndef ARCH_SYSCALL_WORK_ENTER |
29 | # define ARCH_SYSCALL_WORK_ENTER (0) | |
142781e1 TG |
30 | #endif |
31 | ||
a9f3a74a | 32 | /* |
29915524 | 33 | * SYSCALL_WORK flags handled in syscall_exit_to_user_mode() |
a9f3a74a | 34 | */ |
29915524 GKB |
35 | #ifndef ARCH_SYSCALL_WORK_EXIT |
36 | # define ARCH_SYSCALL_WORK_EXIT (0) | |
a9f3a74a TG |
37 | #endif |
38 | ||
524666cb | 39 | #define SYSCALL_WORK_ENTER (SYSCALL_WORK_SECCOMP | \ |
64c19ba2 | 40 | SYSCALL_WORK_SYSCALL_TRACEPOINT | \ |
64eb35f7 | 41 | SYSCALL_WORK_SYSCALL_TRACE | \ |
785dc4eb | 42 | SYSCALL_WORK_SYSCALL_EMU | \ |
29915524 | 43 | SYSCALL_WORK_SYSCALL_AUDIT | \ |
11894468 | 44 | SYSCALL_WORK_SYSCALL_USER_DISPATCH | \ |
29915524 | 45 | ARCH_SYSCALL_WORK_ENTER) |
64c19ba2 | 46 | #define SYSCALL_WORK_EXIT (SYSCALL_WORK_SYSCALL_TRACEPOINT | \ |
785dc4eb | 47 | SYSCALL_WORK_SYSCALL_TRACE | \ |
29915524 | 48 | SYSCALL_WORK_SYSCALL_AUDIT | \ |
11894468 | 49 | SYSCALL_WORK_SYSCALL_USER_DISPATCH | \ |
6342adca | 50 | SYSCALL_WORK_SYSCALL_EXIT_TRAP | \ |
29915524 | 51 | ARCH_SYSCALL_WORK_EXIT) |
b86678cf | 52 | |
a9f3a74a TG |
53 | /* |
54 | * TIF flags handled in exit_to_user_mode_loop() | |
55 | */ | |
56 | #ifndef ARCH_EXIT_TO_USER_MODE_WORK | |
57 | # define ARCH_EXIT_TO_USER_MODE_WORK (0) | |
58 | #endif | |
59 | ||
60 | #define EXIT_TO_USER_MODE_WORK \ | |
61 | (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_UPROBE | \ | |
12db8b69 | 62 | _TIF_NEED_RESCHED | _TIF_PATCH_PENDING | _TIF_NOTIFY_SIGNAL | \ |
a9f3a74a TG |
63 | ARCH_EXIT_TO_USER_MODE_WORK) |
64 | ||
142781e1 TG |
65 | /** |
66 | * arch_check_user_regs - Architecture specific sanity check for user mode regs | |
67 | * @regs: Pointer to currents pt_regs | |
68 | * | |
69 | * Defaults to an empty implementation. Can be replaced by architecture | |
70 | * specific code. | |
71 | * | |
72 | * Invoked from syscall_enter_from_user_mode() in the non-instrumentable | |
73 | * section. Use __always_inline so the compiler cannot push it out of line | |
74 | * and make it instrumentable. | |
75 | */ | |
76 | static __always_inline void arch_check_user_regs(struct pt_regs *regs); | |
77 | ||
78 | #ifndef arch_check_user_regs | |
79 | static __always_inline void arch_check_user_regs(struct pt_regs *regs) {} | |
80 | #endif | |
81 | ||
82 | /** | |
83 | * arch_syscall_enter_tracehook - Wrapper around tracehook_report_syscall_entry() | |
84 | * @regs: Pointer to currents pt_regs | |
85 | * | |
86 | * Returns: 0 on success or an error code to skip the syscall. | |
87 | * | |
88 | * Defaults to tracehook_report_syscall_entry(). Can be replaced by | |
89 | * architecture specific code. | |
90 | * | |
91 | * Invoked from syscall_enter_from_user_mode() | |
92 | */ | |
93 | static inline __must_check int arch_syscall_enter_tracehook(struct pt_regs *regs); | |
94 | ||
95 | #ifndef arch_syscall_enter_tracehook | |
96 | static inline __must_check int arch_syscall_enter_tracehook(struct pt_regs *regs) | |
97 | { | |
98 | return tracehook_report_syscall_entry(regs); | |
99 | } | |
100 | #endif | |
101 | ||
96e2fbcc SS |
102 | /** |
103 | * enter_from_user_mode - Establish state when coming from user mode | |
104 | * | |
105 | * Syscall/interrupt entry disables interrupts, but user mode is traced as | |
106 | * interrupts enabled. Also with NO_HZ_FULL RCU might be idle. | |
107 | * | |
108 | * 1) Tell lockdep that interrupts are disabled | |
109 | * 2) Invoke context tracking if enabled to reactivate RCU | |
110 | * 3) Trace interrupts off state | |
111 | * | |
112 | * Invoked from architecture specific syscall entry code with interrupts | |
113 | * disabled. The calling code has to be non-instrumentable. When the | |
114 | * function returns all state is correct and interrupts are still | |
115 | * disabled. The subsequent functions can be instrumented. | |
116 | * | |
117 | * This is invoked when there is architecture specific functionality to be | |
118 | * done between establishing state and enabling interrupts. The caller must | |
119 | * enable interrupts before invoking syscall_enter_from_user_mode_work(). | |
120 | */ | |
121 | void enter_from_user_mode(struct pt_regs *regs); | |
122 | ||
142781e1 | 123 | /** |
4facb95b | 124 | * syscall_enter_from_user_mode_prepare - Establish state and enable interrupts |
142781e1 | 125 | * @regs: Pointer to currents pt_regs |
142781e1 TG |
126 | * |
127 | * Invoked from architecture specific syscall entry code with interrupts | |
128 | * disabled. The calling code has to be non-instrumentable. When the | |
4facb95b TG |
129 | * function returns all state is correct, interrupts are enabled and the |
130 | * subsequent functions can be instrumented. | |
131 | * | |
96e2fbcc SS |
132 | * This handles lockdep, RCU (context tracking) and tracing state, i.e. |
133 | * the functionality provided by enter_from_user_mode(). | |
4facb95b TG |
134 | * |
135 | * This is invoked when there is extra architecture specific functionality | |
136 | * to be done between establishing state and handling user mode entry work. | |
137 | */ | |
138 | void syscall_enter_from_user_mode_prepare(struct pt_regs *regs); | |
139 | ||
140 | /** | |
141 | * syscall_enter_from_user_mode_work - Check and handle work before invoking | |
142 | * a syscall | |
143 | * @regs: Pointer to currents pt_regs | |
144 | * @syscall: The syscall number | |
145 | * | |
146 | * Invoked from architecture specific syscall entry code with interrupts | |
147 | * enabled after invoking syscall_enter_from_user_mode_prepare() and extra | |
148 | * architecture specific work. | |
142781e1 TG |
149 | * |
150 | * Returns: The original or a modified syscall number | |
151 | * | |
152 | * If the returned syscall number is -1 then the syscall should be | |
153 | * skipped. In this case the caller may invoke syscall_set_error() or | |
154 | * syscall_set_return_value() first. If neither of those are called and -1 | |
155 | * is returned, then the syscall will fail with ENOSYS. | |
156 | * | |
4facb95b | 157 | * It handles the following work items: |
142781e1 | 158 | * |
29915524 GKB |
159 | * 1) syscall_work flag dependent invocations of |
160 | * arch_syscall_enter_tracehook(), __secure_computing(), trace_sys_enter() | |
4facb95b TG |
161 | * 2) Invocation of audit_syscall_entry() |
162 | */ | |
163 | long syscall_enter_from_user_mode_work(struct pt_regs *regs, long syscall); | |
164 | ||
165 | /** | |
166 | * syscall_enter_from_user_mode - Establish state and check and handle work | |
167 | * before invoking a syscall | |
168 | * @regs: Pointer to currents pt_regs | |
169 | * @syscall: The syscall number | |
170 | * | |
171 | * Invoked from architecture specific syscall entry code with interrupts | |
172 | * disabled. The calling code has to be non-instrumentable. When the | |
173 | * function returns all state is correct, interrupts are enabled and the | |
174 | * subsequent functions can be instrumented. | |
175 | * | |
176 | * This is combination of syscall_enter_from_user_mode_prepare() and | |
177 | * syscall_enter_from_user_mode_work(). | |
178 | * | |
179 | * Returns: The original or a modified syscall number. See | |
180 | * syscall_enter_from_user_mode_work() for further explanation. | |
142781e1 TG |
181 | */ |
182 | long syscall_enter_from_user_mode(struct pt_regs *regs, long syscall); | |
183 | ||
a9f3a74a TG |
184 | /** |
185 | * local_irq_enable_exit_to_user - Exit to user variant of local_irq_enable() | |
186 | * @ti_work: Cached TIF flags gathered with interrupts disabled | |
187 | * | |
188 | * Defaults to local_irq_enable(). Can be supplied by architecture specific | |
189 | * code. | |
190 | */ | |
191 | static inline void local_irq_enable_exit_to_user(unsigned long ti_work); | |
192 | ||
193 | #ifndef local_irq_enable_exit_to_user | |
194 | static inline void local_irq_enable_exit_to_user(unsigned long ti_work) | |
195 | { | |
196 | local_irq_enable(); | |
197 | } | |
198 | #endif | |
199 | ||
200 | /** | |
201 | * local_irq_disable_exit_to_user - Exit to user variant of local_irq_disable() | |
202 | * | |
203 | * Defaults to local_irq_disable(). Can be supplied by architecture specific | |
204 | * code. | |
205 | */ | |
206 | static inline void local_irq_disable_exit_to_user(void); | |
207 | ||
208 | #ifndef local_irq_disable_exit_to_user | |
209 | static inline void local_irq_disable_exit_to_user(void) | |
210 | { | |
211 | local_irq_disable(); | |
212 | } | |
213 | #endif | |
214 | ||
215 | /** | |
216 | * arch_exit_to_user_mode_work - Architecture specific TIF work for exit | |
217 | * to user mode. | |
218 | * @regs: Pointer to currents pt_regs | |
219 | * @ti_work: Cached TIF flags gathered with interrupts disabled | |
220 | * | |
221 | * Invoked from exit_to_user_mode_loop() with interrupt enabled | |
222 | * | |
223 | * Defaults to NOOP. Can be supplied by architecture specific code. | |
224 | */ | |
225 | static inline void arch_exit_to_user_mode_work(struct pt_regs *regs, | |
226 | unsigned long ti_work); | |
227 | ||
228 | #ifndef arch_exit_to_user_mode_work | |
229 | static inline void arch_exit_to_user_mode_work(struct pt_regs *regs, | |
230 | unsigned long ti_work) | |
231 | { | |
232 | } | |
233 | #endif | |
234 | ||
235 | /** | |
236 | * arch_exit_to_user_mode_prepare - Architecture specific preparation for | |
237 | * exit to user mode. | |
238 | * @regs: Pointer to currents pt_regs | |
239 | * @ti_work: Cached TIF flags gathered with interrupts disabled | |
240 | * | |
241 | * Invoked from exit_to_user_mode_prepare() with interrupt disabled as the last | |
242 | * function before return. Defaults to NOOP. | |
243 | */ | |
244 | static inline void arch_exit_to_user_mode_prepare(struct pt_regs *regs, | |
245 | unsigned long ti_work); | |
246 | ||
247 | #ifndef arch_exit_to_user_mode_prepare | |
248 | static inline void arch_exit_to_user_mode_prepare(struct pt_regs *regs, | |
249 | unsigned long ti_work) | |
250 | { | |
251 | } | |
252 | #endif | |
253 | ||
254 | /** | |
255 | * arch_exit_to_user_mode - Architecture specific final work before | |
256 | * exit to user mode. | |
257 | * | |
258 | * Invoked from exit_to_user_mode() with interrupt disabled as the last | |
259 | * function before return. Defaults to NOOP. | |
260 | * | |
261 | * This needs to be __always_inline because it is non-instrumentable code | |
262 | * invoked after context tracking switched to user mode. | |
263 | * | |
264 | * An architecture implementation must not do anything complex, no locking | |
265 | * etc. The main purpose is for speculation mitigations. | |
266 | */ | |
267 | static __always_inline void arch_exit_to_user_mode(void); | |
268 | ||
269 | #ifndef arch_exit_to_user_mode | |
270 | static __always_inline void arch_exit_to_user_mode(void) { } | |
271 | #endif | |
272 | ||
273 | /** | |
12db8b69 | 274 | * arch_do_signal_or_restart - Architecture specific signal delivery function |
a9f3a74a | 275 | * @regs: Pointer to currents pt_regs |
12db8b69 | 276 | * @has_signal: actual signal to handle |
a9f3a74a TG |
277 | * |
278 | * Invoked from exit_to_user_mode_loop(). | |
279 | */ | |
12db8b69 | 280 | void arch_do_signal_or_restart(struct pt_regs *regs, bool has_signal); |
a9f3a74a TG |
281 | |
282 | /** | |
283 | * arch_syscall_exit_tracehook - Wrapper around tracehook_report_syscall_exit() | |
284 | * @regs: Pointer to currents pt_regs | |
285 | * @step: Indicator for single step | |
286 | * | |
287 | * Defaults to tracehook_report_syscall_exit(). Can be replaced by | |
288 | * architecture specific code. | |
289 | * | |
290 | * Invoked from syscall_exit_to_user_mode() | |
291 | */ | |
292 | static inline void arch_syscall_exit_tracehook(struct pt_regs *regs, bool step); | |
293 | ||
294 | #ifndef arch_syscall_exit_tracehook | |
295 | static inline void arch_syscall_exit_tracehook(struct pt_regs *regs, bool step) | |
296 | { | |
297 | tracehook_report_syscall_exit(regs, step); | |
298 | } | |
299 | #endif | |
300 | ||
310de1a6 SS |
301 | /** |
302 | * exit_to_user_mode - Fixup state when exiting to user mode | |
303 | * | |
304 | * Syscall/interrupt exit enables interrupts, but the kernel state is | |
305 | * interrupts disabled when this is invoked. Also tell RCU about it. | |
306 | * | |
307 | * 1) Trace interrupts on state | |
308 | * 2) Invoke context tracking if enabled to adjust RCU state | |
309 | * 3) Invoke architecture specific last minute exit code, e.g. speculation | |
310 | * mitigations, etc.: arch_exit_to_user_mode() | |
311 | * 4) Tell lockdep that interrupts are enabled | |
312 | * | |
313 | * Invoked from architecture specific code when syscall_exit_to_user_mode() | |
314 | * is not suitable as the last step before returning to userspace. Must be | |
315 | * invoked with interrupts disabled and the caller must be | |
316 | * non-instrumentable. | |
c6156e1d | 317 | * The caller has to invoke syscall_exit_to_user_mode_work() before this. |
310de1a6 SS |
318 | */ |
319 | void exit_to_user_mode(void); | |
320 | ||
c6156e1d SS |
321 | /** |
322 | * syscall_exit_to_user_mode_work - Handle work before returning to user mode | |
323 | * @regs: Pointer to currents pt_regs | |
324 | * | |
325 | * Same as step 1 and 2 of syscall_exit_to_user_mode() but without calling | |
326 | * exit_to_user_mode() to perform the final transition to user mode. | |
327 | * | |
328 | * Calling convention is the same as for syscall_exit_to_user_mode() and it | |
329 | * returns with all work handled and interrupts disabled. The caller must | |
330 | * invoke exit_to_user_mode() before actually switching to user mode to | |
331 | * make the final state transitions. Interrupts must stay disabled between | |
332 | * return from this function and the invocation of exit_to_user_mode(). | |
333 | */ | |
334 | void syscall_exit_to_user_mode_work(struct pt_regs *regs); | |
335 | ||
a9f3a74a TG |
336 | /** |
337 | * syscall_exit_to_user_mode - Handle work before returning to user mode | |
338 | * @regs: Pointer to currents pt_regs | |
339 | * | |
340 | * Invoked with interrupts enabled and fully valid regs. Returns with all | |
341 | * work handled, interrupts disabled such that the caller can immediately | |
342 | * switch to user mode. Called from architecture specific syscall and ret | |
343 | * from fork code. | |
344 | * | |
345 | * The call order is: | |
346 | * 1) One-time syscall exit work: | |
347 | * - rseq syscall exit | |
348 | * - audit | |
349 | * - syscall tracing | |
350 | * - tracehook (single stepping) | |
351 | * | |
352 | * 2) Preparatory work | |
353 | * - Exit to user mode loop (common TIF handling). Invokes | |
354 | * arch_exit_to_user_mode_work() for architecture specific TIF work | |
355 | * - Architecture specific one time work arch_exit_to_user_mode_prepare() | |
356 | * - Address limit and lockdep checks | |
357 | * | |
310de1a6 SS |
358 | * 3) Final transition (lockdep, tracing, context tracking, RCU), i.e. the |
359 | * functionality in exit_to_user_mode(). | |
c6156e1d SS |
360 | * |
361 | * This is a combination of syscall_exit_to_user_mode_work() (1,2) and | |
362 | * exit_to_user_mode(). This function is preferred unless there is a | |
97258ce9 | 363 | * compelling architectural reason to use the separate functions. |
a9f3a74a TG |
364 | */ |
365 | void syscall_exit_to_user_mode(struct pt_regs *regs); | |
366 | ||
142781e1 TG |
367 | /** |
368 | * irqentry_enter_from_user_mode - Establish state before invoking the irq handler | |
369 | * @regs: Pointer to currents pt_regs | |
370 | * | |
371 | * Invoked from architecture specific entry code with interrupts disabled. | |
372 | * Can only be called when the interrupt entry came from user mode. The | |
373 | * calling code must be non-instrumentable. When the function returns all | |
374 | * state is correct and the subsequent functions can be instrumented. | |
375 | * | |
376 | * The function establishes state (lockdep, RCU (context tracking), tracing) | |
377 | */ | |
378 | void irqentry_enter_from_user_mode(struct pt_regs *regs); | |
379 | ||
a9f3a74a TG |
380 | /** |
381 | * irqentry_exit_to_user_mode - Interrupt exit work | |
382 | * @regs: Pointer to current's pt_regs | |
383 | * | |
97258ce9 | 384 | * Invoked with interrupts disabled and fully valid regs. Returns with all |
a9f3a74a TG |
385 | * work handled, interrupts disabled such that the caller can immediately |
386 | * switch to user mode. Called from architecture specific interrupt | |
387 | * handling code. | |
388 | * | |
389 | * The call order is #2 and #3 as described in syscall_exit_to_user_mode(). | |
390 | * Interrupt exit is not invoking #1 which is the syscall specific one time | |
391 | * work. | |
392 | */ | |
393 | void irqentry_exit_to_user_mode(struct pt_regs *regs); | |
394 | ||
a5497bab | 395 | #ifndef irqentry_state |
b6be002b TG |
396 | /** |
397 | * struct irqentry_state - Opaque object for exception state storage | |
398 | * @exit_rcu: Used exclusively in the irqentry_*() calls; signals whether the | |
399 | * exit path has to invoke rcu_irq_exit(). | |
400 | * @lockdep: Used exclusively in the irqentry_nmi_*() calls; ensures that | |
401 | * lockdep state is restored correctly on exit from nmi. | |
402 | * | |
403 | * This opaque object is filled in by the irqentry_*_enter() functions and | |
404 | * must be passed back into the corresponding irqentry_*_exit() functions | |
405 | * when the exception is complete. | |
406 | * | |
407 | * Callers of irqentry_*_[enter|exit]() must consider this structure opaque | |
408 | * and all members private. Descriptions of the members are provided to aid in | |
409 | * the maintenance of the irqentry_*() functions. | |
410 | */ | |
a5497bab | 411 | typedef struct irqentry_state { |
b6be002b TG |
412 | union { |
413 | bool exit_rcu; | |
414 | bool lockdep; | |
415 | }; | |
a5497bab TG |
416 | } irqentry_state_t; |
417 | #endif | |
418 | ||
419 | /** | |
420 | * irqentry_enter - Handle state tracking on ordinary interrupt entries | |
421 | * @regs: Pointer to pt_regs of interrupted context | |
422 | * | |
423 | * Invokes: | |
424 | * - lockdep irqflag state tracking as low level ASM entry disabled | |
425 | * interrupts. | |
426 | * | |
427 | * - Context tracking if the exception hit user mode. | |
428 | * | |
429 | * - The hardirq tracer to keep the state consistent as low level ASM | |
430 | * entry disabled interrupts. | |
431 | * | |
432 | * As a precondition, this requires that the entry came from user mode, | |
433 | * idle, or a kernel context in which RCU is watching. | |
434 | * | |
435 | * For kernel mode entries RCU handling is done conditional. If RCU is | |
436 | * watching then the only RCU requirement is to check whether the tick has | |
437 | * to be restarted. If RCU is not watching then rcu_irq_enter() has to be | |
438 | * invoked on entry and rcu_irq_exit() on exit. | |
439 | * | |
440 | * Avoiding the rcu_irq_enter/exit() calls is an optimization but also | |
441 | * solves the problem of kernel mode pagefaults which can schedule, which | |
442 | * is not possible after invoking rcu_irq_enter() without undoing it. | |
443 | * | |
444 | * For user mode entries irqentry_enter_from_user_mode() is invoked to | |
445 | * establish the proper context for NOHZ_FULL. Otherwise scheduling on exit | |
446 | * would not be possible. | |
447 | * | |
448 | * Returns: An opaque object that must be passed to idtentry_exit() | |
449 | */ | |
450 | irqentry_state_t noinstr irqentry_enter(struct pt_regs *regs); | |
451 | ||
452 | /** | |
453 | * irqentry_exit_cond_resched - Conditionally reschedule on return from interrupt | |
454 | * | |
455 | * Conditional reschedule with additional sanity checks. | |
456 | */ | |
457 | void irqentry_exit_cond_resched(void); | |
40607ee9 PZI |
458 | #ifdef CONFIG_PREEMPT_DYNAMIC |
459 | DECLARE_STATIC_CALL(irqentry_exit_cond_resched, irqentry_exit_cond_resched); | |
460 | #endif | |
a5497bab TG |
461 | |
462 | /** | |
463 | * irqentry_exit - Handle return from exception that used irqentry_enter() | |
464 | * @regs: Pointer to pt_regs (exception entry regs) | |
465 | * @state: Return value from matching call to irqentry_enter() | |
466 | * | |
467 | * Depending on the return target (kernel/user) this runs the necessary | |
78a56e04 | 468 | * preemption and work checks if possible and required and returns to |
a5497bab TG |
469 | * the caller with interrupts disabled and no further work pending. |
470 | * | |
471 | * This is the last action before returning to the low level ASM code which | |
472 | * just needs to return to the appropriate context. | |
473 | * | |
474 | * Counterpart to irqentry_enter(). | |
475 | */ | |
476 | void noinstr irqentry_exit(struct pt_regs *regs, irqentry_state_t state); | |
477 | ||
b6be002b TG |
478 | /** |
479 | * irqentry_nmi_enter - Handle NMI entry | |
480 | * @regs: Pointer to currents pt_regs | |
481 | * | |
482 | * Similar to irqentry_enter() but taking care of the NMI constraints. | |
483 | */ | |
484 | irqentry_state_t noinstr irqentry_nmi_enter(struct pt_regs *regs); | |
485 | ||
486 | /** | |
487 | * irqentry_nmi_exit - Handle return from NMI handling | |
488 | * @regs: Pointer to pt_regs (NMI entry regs) | |
489 | * @irq_state: Return value from matching call to irqentry_nmi_enter() | |
490 | * | |
78a56e04 | 491 | * Last action before returning to the low level assembly code. |
b6be002b TG |
492 | * |
493 | * Counterpart to irqentry_nmi_enter(). | |
494 | */ | |
495 | void noinstr irqentry_nmi_exit(struct pt_regs *regs, irqentry_state_t irq_state); | |
496 | ||
142781e1 | 497 | #endif |