1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * linux/arch/arm/kernel/signal.c
4 *
5 * Copyright (C) 1995-2009 Russell King
6 */
7 #include <linux/errno.h>
8 #include <linux/random.h>
9 #include <linux/signal.h>
10 #include <linux/personality.h>
11 #include <linux/uaccess.h>
12 #include <linux/resume_user_mode.h>
13 #include <linux/uprobes.h>
14 #include <linux/syscalls.h>
15
16 #include <asm/elf.h>
17 #include <asm/cacheflush.h>
18 #include <asm/traps.h>
19 #include <asm/unistd.h>
20 #include <asm/vfp.h>
21 #include <asm/syscalls.h>
22
23 #include "signal.h"
24
25 extern const unsigned long sigreturn_codes[17];
26
27 static unsigned long signal_return_offset;
28
29 #ifdef CONFIG_IWMMXT
30
preserve_iwmmxt_context(struct iwmmxt_sigframe __user * frame)31 static int preserve_iwmmxt_context(struct iwmmxt_sigframe __user *frame)
32 {
33 char kbuf[sizeof(*frame) + 8];
34 struct iwmmxt_sigframe *kframe;
35 int err = 0;
36
37 /* the iWMMXt context must be 64 bit aligned */
38 kframe = (struct iwmmxt_sigframe *)((unsigned long)(kbuf + 8) & ~7);
39
40 if (test_thread_flag(TIF_USING_IWMMXT)) {
41 kframe->magic = IWMMXT_MAGIC;
42 kframe->size = IWMMXT_STORAGE_SIZE;
43 iwmmxt_task_copy(current_thread_info(), &kframe->storage);
44 } else {
45 /*
46 * For bug-compatibility with older kernels, some space
47 * has to be reserved for iWMMXt even if it's not used.
48 * Set the magic and size appropriately so that properly
49 * written userspace can skip it reliably:
50 */
51 *kframe = (struct iwmmxt_sigframe) {
52 .magic = DUMMY_MAGIC,
53 .size = IWMMXT_STORAGE_SIZE,
54 };
55 }
56
57 err = __copy_to_user(frame, kframe, sizeof(*kframe));
58
59 return err;
60 }
61
restore_iwmmxt_context(char __user ** auxp)62 static int restore_iwmmxt_context(char __user **auxp)
63 {
64 struct iwmmxt_sigframe __user *frame =
65 (struct iwmmxt_sigframe __user *)*auxp;
66 char kbuf[sizeof(*frame) + 8];
67 struct iwmmxt_sigframe *kframe;
68
69 /* the iWMMXt context must be 64 bit aligned */
70 kframe = (struct iwmmxt_sigframe *)((unsigned long)(kbuf + 8) & ~7);
71 if (__copy_from_user(kframe, frame, sizeof(*frame)))
72 return -1;
73
74 /*
75 * For non-iWMMXt threads: a single iwmmxt_sigframe-sized dummy
76 * block is discarded for compatibility with setup_sigframe() if
77 * present, but we don't mandate its presence. If some other
78 * magic is here, it's not for us:
79 */
80 if (!test_thread_flag(TIF_USING_IWMMXT) &&
81 kframe->magic != DUMMY_MAGIC)
82 return 0;
83
84 if (kframe->size != IWMMXT_STORAGE_SIZE)
85 return -1;
86
87 if (test_thread_flag(TIF_USING_IWMMXT)) {
88 if (kframe->magic != IWMMXT_MAGIC)
89 return -1;
90
91 iwmmxt_task_restore(current_thread_info(), &kframe->storage);
92 }
93
94 *auxp += IWMMXT_STORAGE_SIZE;
95 return 0;
96 }
97
98 #endif
99
100 #ifdef CONFIG_VFP
101
preserve_vfp_context(struct vfp_sigframe __user * frame)102 static int preserve_vfp_context(struct vfp_sigframe __user *frame)
103 {
104 struct vfp_sigframe kframe;
105 int err = 0;
106
107 memset(&kframe, 0, sizeof(kframe));
108 kframe.magic = VFP_MAGIC;
109 kframe.size = VFP_STORAGE_SIZE;
110
111 err = vfp_preserve_user_clear_hwstate(&kframe.ufp, &kframe.ufp_exc);
112 if (err)
113 return err;
114
115 return __copy_to_user(frame, &kframe, sizeof(kframe));
116 }
117
restore_vfp_context(char __user ** auxp)118 static int restore_vfp_context(char __user **auxp)
119 {
120 struct vfp_sigframe frame;
121 int err;
122
123 err = __copy_from_user(&frame, *auxp, sizeof(frame));
124 if (err)
125 return err;
126
127 if (frame.magic != VFP_MAGIC || frame.size != VFP_STORAGE_SIZE)
128 return -EINVAL;
129
130 *auxp += sizeof(frame);
131 return vfp_restore_user_hwstate(&frame.ufp, &frame.ufp_exc);
132 }
133
134 #endif
135
136 /*
137 * Do a signal return; undo the signal stack. These are aligned to 64-bit.
138 */
139
restore_sigframe(struct pt_regs * regs,struct sigframe __user * sf)140 static int restore_sigframe(struct pt_regs *regs, struct sigframe __user *sf)
141 {
142 struct sigcontext context;
143 char __user *aux;
144 sigset_t set;
145 int err;
146
147 err = __copy_from_user(&set, &sf->uc.uc_sigmask, sizeof(set));
148 if (err == 0)
149 set_current_blocked(&set);
150
151 err |= __copy_from_user(&context, &sf->uc.uc_mcontext, sizeof(context));
152 if (err == 0) {
153 regs->ARM_r0 = context.arm_r0;
154 regs->ARM_r1 = context.arm_r1;
155 regs->ARM_r2 = context.arm_r2;
156 regs->ARM_r3 = context.arm_r3;
157 regs->ARM_r4 = context.arm_r4;
158 regs->ARM_r5 = context.arm_r5;
159 regs->ARM_r6 = context.arm_r6;
160 regs->ARM_r7 = context.arm_r7;
161 regs->ARM_r8 = context.arm_r8;
162 regs->ARM_r9 = context.arm_r9;
163 regs->ARM_r10 = context.arm_r10;
164 regs->ARM_fp = context.arm_fp;
165 regs->ARM_ip = context.arm_ip;
166 regs->ARM_sp = context.arm_sp;
167 regs->ARM_lr = context.arm_lr;
168 regs->ARM_pc = context.arm_pc;
169 regs->ARM_cpsr = context.arm_cpsr;
170 }
171
172 err |= !valid_user_regs(regs);
173
174 aux = (char __user *) sf->uc.uc_regspace;
175 #ifdef CONFIG_IWMMXT
176 if (err == 0)
177 err |= restore_iwmmxt_context(&aux);
178 #endif
179 #ifdef CONFIG_VFP
180 if (err == 0)
181 err |= restore_vfp_context(&aux);
182 #endif
183
184 return err;
185 }
186
sys_sigreturn(struct pt_regs * regs)187 asmlinkage int sys_sigreturn(struct pt_regs *regs)
188 {
189 struct sigframe __user *frame;
190
191 /* Always make any pending restarted system calls return -EINTR */
192 current->restart_block.fn = do_no_restart_syscall;
193
194 /*
195 * Since we stacked the signal on a 64-bit boundary,
196 * then 'sp' should be word aligned here. If it's
197 * not, then the user is trying to mess with us.
198 */
199 if (regs->ARM_sp & 7)
200 goto badframe;
201
202 frame = (struct sigframe __user *)regs->ARM_sp;
203
204 if (!access_ok(frame, sizeof (*frame)))
205 goto badframe;
206
207 if (restore_sigframe(regs, frame))
208 goto badframe;
209
210 return regs->ARM_r0;
211
212 badframe:
213 force_sig(SIGSEGV);
214 return 0;
215 }
216
sys_rt_sigreturn(struct pt_regs * regs)217 asmlinkage int sys_rt_sigreturn(struct pt_regs *regs)
218 {
219 struct rt_sigframe __user *frame;
220
221 /* Always make any pending restarted system calls return -EINTR */
222 current->restart_block.fn = do_no_restart_syscall;
223
224 /*
225 * Since we stacked the signal on a 64-bit boundary,
226 * then 'sp' should be word aligned here. If it's
227 * not, then the user is trying to mess with us.
228 */
229 if (regs->ARM_sp & 7)
230 goto badframe;
231
232 frame = (struct rt_sigframe __user *)regs->ARM_sp;
233
234 if (!access_ok(frame, sizeof (*frame)))
235 goto badframe;
236
237 if (restore_sigframe(regs, &frame->sig))
238 goto badframe;
239
240 if (restore_altstack(&frame->sig.uc.uc_stack))
241 goto badframe;
242
243 return regs->ARM_r0;
244
245 badframe:
246 force_sig(SIGSEGV);
247 return 0;
248 }
249
250 static int
setup_sigframe(struct sigframe __user * sf,struct pt_regs * regs,sigset_t * set)251 setup_sigframe(struct sigframe __user *sf, struct pt_regs *regs, sigset_t *set)
252 {
253 struct aux_sigframe __user *aux;
254 struct sigcontext context;
255 int err = 0;
256
257 context = (struct sigcontext) {
258 .arm_r0 = regs->ARM_r0,
259 .arm_r1 = regs->ARM_r1,
260 .arm_r2 = regs->ARM_r2,
261 .arm_r3 = regs->ARM_r3,
262 .arm_r4 = regs->ARM_r4,
263 .arm_r5 = regs->ARM_r5,
264 .arm_r6 = regs->ARM_r6,
265 .arm_r7 = regs->ARM_r7,
266 .arm_r8 = regs->ARM_r8,
267 .arm_r9 = regs->ARM_r9,
268 .arm_r10 = regs->ARM_r10,
269 .arm_fp = regs->ARM_fp,
270 .arm_ip = regs->ARM_ip,
271 .arm_sp = regs->ARM_sp,
272 .arm_lr = regs->ARM_lr,
273 .arm_pc = regs->ARM_pc,
274 .arm_cpsr = regs->ARM_cpsr,
275
276 .trap_no = current->thread.trap_no,
277 .error_code = current->thread.error_code,
278 .fault_address = current->thread.address,
279 .oldmask = set->sig[0],
280 };
281
282 err |= __copy_to_user(&sf->uc.uc_mcontext, &context, sizeof(context));
283
284 err |= __copy_to_user(&sf->uc.uc_sigmask, set, sizeof(*set));
285
286 aux = (struct aux_sigframe __user *) sf->uc.uc_regspace;
287 #ifdef CONFIG_IWMMXT
288 if (err == 0)
289 err |= preserve_iwmmxt_context(&aux->iwmmxt);
290 #endif
291 #ifdef CONFIG_VFP
292 if (err == 0)
293 err |= preserve_vfp_context(&aux->vfp);
294 #endif
295 err |= __put_user(0, &aux->end_magic);
296
297 return err;
298 }
299
300 static inline void __user *
get_sigframe(struct ksignal * ksig,struct pt_regs * regs,int framesize)301 get_sigframe(struct ksignal *ksig, struct pt_regs *regs, int framesize)
302 {
303 unsigned long sp = sigsp(regs->ARM_sp, ksig);
304 void __user *frame;
305
306 /*
307 * ATPCS B01 mandates 8-byte alignment
308 */
309 frame = (void __user *)((sp - framesize) & ~7);
310
311 /*
312 * Check that we can actually write to the signal frame.
313 */
314 if (!access_ok(frame, framesize))
315 frame = NULL;
316
317 return frame;
318 }
319
320 static int
setup_return(struct pt_regs * regs,struct ksignal * ksig,unsigned long __user * rc,void __user * frame)321 setup_return(struct pt_regs *regs, struct ksignal *ksig,
322 unsigned long __user *rc, void __user *frame)
323 {
324 unsigned long handler = (unsigned long)ksig->ka.sa.sa_handler;
325 unsigned long handler_fdpic_GOT = 0;
326 unsigned long retcode;
327 unsigned int idx, thumb = 0;
328 unsigned long cpsr = regs->ARM_cpsr & ~(PSR_f | PSR_E_BIT);
329 bool fdpic = IS_ENABLED(CONFIG_BINFMT_ELF_FDPIC) &&
330 (current->personality & FDPIC_FUNCPTRS);
331
332 if (fdpic) {
333 unsigned long __user *fdpic_func_desc =
334 (unsigned long __user *)handler;
335 if (__get_user(handler, &fdpic_func_desc[0]) ||
336 __get_user(handler_fdpic_GOT, &fdpic_func_desc[1]))
337 return 1;
338 }
339
340 if (IS_ENABLED(CONFIG_CPU_ENDIAN_BE8))
341 cpsr |= PSR_E_BIT;
342
343 /*
344 * Maybe we need to deliver a 32-bit signal to a 26-bit task.
345 */
346 if (ksig->ka.sa.sa_flags & SA_THIRTYTWO)
347 cpsr = (cpsr & ~MODE_MASK) | USR_MODE;
348
349 #ifdef CONFIG_ARM_THUMB
350 if (elf_hwcap & HWCAP_THUMB) {
351 /*
352 * The LSB of the handler determines if we're going to
353 * be using THUMB or ARM mode for this signal handler.
354 */
355 thumb = handler & 1;
356
357 /*
358 * Clear the If-Then Thumb-2 execution state. ARM spec
359 * requires this to be all 000s in ARM mode. Snapdragon
360 * S4/Krait misbehaves on a Thumb=>ARM signal transition
361 * without this.
362 *
363 * We must do this whenever we are running on a Thumb-2
364 * capable CPU, which includes ARMv6T2. However, we elect
365 * to always do this to simplify the code; this field is
366 * marked UNK/SBZP for older architectures.
367 */
368 cpsr &= ~PSR_IT_MASK;
369
370 if (thumb) {
371 cpsr |= PSR_T_BIT;
372 } else
373 cpsr &= ~PSR_T_BIT;
374 }
375 #endif
376
377 if (ksig->ka.sa.sa_flags & SA_RESTORER) {
378 retcode = (unsigned long)ksig->ka.sa.sa_restorer;
379 if (fdpic) {
380 /*
381 * We need code to load the function descriptor.
382 * That code follows the standard sigreturn code
383 * (6 words), and is made of 3 + 2 words for each
384 * variant. The 4th copied word is the actual FD
385 * address that the assembly code expects.
386 */
387 idx = 6 + thumb * 3;
388 if (ksig->ka.sa.sa_flags & SA_SIGINFO)
389 idx += 5;
390 if (__put_user(sigreturn_codes[idx], rc ) ||
391 __put_user(sigreturn_codes[idx+1], rc+1) ||
392 __put_user(sigreturn_codes[idx+2], rc+2) ||
393 __put_user(retcode, rc+3))
394 return 1;
395 goto rc_finish;
396 }
397 } else {
398 idx = thumb << 1;
399 if (ksig->ka.sa.sa_flags & SA_SIGINFO)
400 idx += 3;
401
402 /*
403 * Put the sigreturn code on the stack no matter which return
404 * mechanism we use in order to remain ABI compliant
405 */
406 if (__put_user(sigreturn_codes[idx], rc) ||
407 __put_user(sigreturn_codes[idx+1], rc+1))
408 return 1;
409
410 rc_finish:
411 #ifdef CONFIG_MMU
412 if (cpsr & MODE32_BIT) {
413 struct mm_struct *mm = current->mm;
414
415 /*
416 * 32-bit code can use the signal return page
417 * except when the MPU has protected the vectors
418 * page from PL0
419 */
420 retcode = mm->context.sigpage + signal_return_offset +
421 (idx << 2) + thumb;
422 } else
423 #endif
424 {
425 /*
426 * Ensure that the instruction cache sees
427 * the return code written onto the stack.
428 */
429 flush_icache_range((unsigned long)rc,
430 (unsigned long)(rc + 3));
431
432 retcode = ((unsigned long)rc) + thumb;
433 }
434 }
435
436 regs->ARM_r0 = ksig->sig;
437 regs->ARM_sp = (unsigned long)frame;
438 regs->ARM_lr = retcode;
439 regs->ARM_pc = handler;
440 if (fdpic)
441 regs->ARM_r9 = handler_fdpic_GOT;
442 regs->ARM_cpsr = cpsr;
443
444 return 0;
445 }
446
447 static int
setup_frame(struct ksignal * ksig,sigset_t * set,struct pt_regs * regs)448 setup_frame(struct ksignal *ksig, sigset_t *set, struct pt_regs *regs)
449 {
450 struct sigframe __user *frame = get_sigframe(ksig, regs, sizeof(*frame));
451 int err = 0;
452
453 if (!frame)
454 return 1;
455
456 /*
457 * Set uc.uc_flags to a value which sc.trap_no would never have.
458 */
459 err = __put_user(0x5ac3c35a, &frame->uc.uc_flags);
460
461 err |= setup_sigframe(frame, regs, set);
462 if (err == 0)
463 err = setup_return(regs, ksig, frame->retcode, frame);
464
465 return err;
466 }
467
468 static int
setup_rt_frame(struct ksignal * ksig,sigset_t * set,struct pt_regs * regs)469 setup_rt_frame(struct ksignal *ksig, sigset_t *set, struct pt_regs *regs)
470 {
471 struct rt_sigframe __user *frame = get_sigframe(ksig, regs, sizeof(*frame));
472 int err = 0;
473
474 if (!frame)
475 return 1;
476
477 err |= copy_siginfo_to_user(&frame->info, &ksig->info);
478
479 err |= __put_user(0, &frame->sig.uc.uc_flags);
480 err |= __put_user(NULL, &frame->sig.uc.uc_link);
481
482 err |= __save_altstack(&frame->sig.uc.uc_stack, regs->ARM_sp);
483 err |= setup_sigframe(&frame->sig, regs, set);
484 if (err == 0)
485 err = setup_return(regs, ksig, frame->sig.retcode, frame);
486
487 if (err == 0) {
488 /*
489 * For realtime signals we must also set the second and third
490 * arguments for the signal handler.
491 * -- Peter Maydell <pmaydell@chiark.greenend.org.uk> 2000-12-06
492 */
493 regs->ARM_r1 = (unsigned long)&frame->info;
494 regs->ARM_r2 = (unsigned long)&frame->sig.uc;
495 }
496
497 return err;
498 }
499
500 /*
501 * OK, we're invoking a handler
502 */
handle_signal(struct ksignal * ksig,struct pt_regs * regs)503 static void handle_signal(struct ksignal *ksig, struct pt_regs *regs)
504 {
505 sigset_t *oldset = sigmask_to_save();
506 int ret;
507
508 /*
509 * Perform fixup for the pre-signal frame.
510 */
511 rseq_signal_deliver(ksig, regs);
512
513 /*
514 * Set up the stack frame
515 */
516 if (ksig->ka.sa.sa_flags & SA_SIGINFO)
517 ret = setup_rt_frame(ksig, oldset, regs);
518 else
519 ret = setup_frame(ksig, oldset, regs);
520
521 /*
522 * Check that the resulting registers are actually sane.
523 */
524 ret |= !valid_user_regs(regs);
525
526 signal_setup_done(ret, ksig, 0);
527 }
528
529 /*
530 * Note that 'init' is a special process: it doesn't get signals it doesn't
531 * want to handle. Thus you cannot kill init even with a SIGKILL even by
532 * mistake.
533 *
534 * Note that we go through the signals twice: once to check the signals that
535 * the kernel can handle, and then we build all the user-level signal handling
536 * stack-frames in one go after that.
537 */
do_signal(struct pt_regs * regs,int syscall)538 static int do_signal(struct pt_regs *regs, int syscall)
539 {
540 unsigned int retval = 0, continue_addr = 0, restart_addr = 0;
541 struct ksignal ksig;
542 int restart = 0;
543
544 /*
545 * If we were from a system call, check for system call restarting...
546 */
547 if (syscall) {
548 continue_addr = regs->ARM_pc;
549 restart_addr = continue_addr - (thumb_mode(regs) ? 2 : 4);
550 retval = regs->ARM_r0;
551
552 /*
553 * Prepare for system call restart. We do this here so that a
554 * debugger will see the already changed PSW.
555 */
556 switch (retval) {
557 case -ERESTART_RESTARTBLOCK:
558 restart -= 2;
559 fallthrough;
560 case -ERESTARTNOHAND:
561 case -ERESTARTSYS:
562 case -ERESTARTNOINTR:
563 restart++;
564 regs->ARM_r0 = regs->ARM_ORIG_r0;
565 regs->ARM_pc = restart_addr;
566 break;
567 }
568 }
569
570 /*
571 * Get the signal to deliver. When running under ptrace, at this
572 * point the debugger may change all our registers ...
573 */
574 /*
575 * Depending on the signal settings we may need to revert the
576 * decision to restart the system call. But skip this if a
577 * debugger has chosen to restart at a different PC.
578 */
579 if (get_signal(&ksig)) {
580 /* handler */
581 if (unlikely(restart) && regs->ARM_pc == restart_addr) {
582 if (retval == -ERESTARTNOHAND ||
583 retval == -ERESTART_RESTARTBLOCK
584 || (retval == -ERESTARTSYS
585 && !(ksig.ka.sa.sa_flags & SA_RESTART))) {
586 regs->ARM_r0 = -EINTR;
587 regs->ARM_pc = continue_addr;
588 }
589 }
590 handle_signal(&ksig, regs);
591 } else {
592 /* no handler */
593 restore_saved_sigmask();
594 if (unlikely(restart) && regs->ARM_pc == restart_addr) {
595 regs->ARM_pc = continue_addr;
596 return restart;
597 }
598 }
599 return 0;
600 }
601
602 asmlinkage int
do_work_pending(struct pt_regs * regs,unsigned int thread_flags,int syscall)603 do_work_pending(struct pt_regs *regs, unsigned int thread_flags, int syscall)
604 {
605 /*
606 * The assembly code enters us with IRQs off, but it hasn't
607 * informed the tracing code of that for efficiency reasons.
608 * Update the trace code with the current status.
609 */
610 trace_hardirqs_off();
611 do {
612 if (likely(thread_flags & _TIF_NEED_RESCHED)) {
613 schedule();
614 } else {
615 if (unlikely(!user_mode(regs)))
616 return 0;
617 local_irq_enable();
618 if (thread_flags & (_TIF_SIGPENDING | _TIF_NOTIFY_SIGNAL)) {
619 int restart = do_signal(regs, syscall);
620 if (unlikely(restart)) {
621 /*
622 * Restart without handlers.
623 * Deal with it without leaving
624 * the kernel space.
625 */
626 return restart;
627 }
628 syscall = 0;
629 } else if (thread_flags & _TIF_UPROBE) {
630 uprobe_notify_resume(regs);
631 } else {
632 resume_user_mode_work(regs);
633 }
634 }
635 local_irq_disable();
636 thread_flags = read_thread_flags();
637 } while (thread_flags & _TIF_WORK_MASK);
638 return 0;
639 }
640
get_signal_page(void)641 struct page *get_signal_page(void)
642 {
643 unsigned long ptr;
644 unsigned offset;
645 struct page *page;
646 void *addr;
647
648 page = alloc_pages(GFP_KERNEL, 0);
649
650 if (!page)
651 return NULL;
652
653 addr = page_address(page);
654
655 /* Poison the entire page */
656 memset32(addr, __opcode_to_mem_arm(0xe7fddef1),
657 PAGE_SIZE / sizeof(u32));
658
659 /* Give the signal return code some randomness */
660 offset = 0x200 + (get_random_u16() & 0x7fc);
661 signal_return_offset = offset;
662
663 /* Copy signal return handlers into the page */
664 memcpy(addr + offset, sigreturn_codes, sizeof(sigreturn_codes));
665
666 /* Flush out all instructions in this page */
667 ptr = (unsigned long)addr;
668 flush_icache_range(ptr, ptr + PAGE_SIZE);
669
670 return page;
671 }
672
673 #ifdef CONFIG_DEBUG_RSEQ
do_rseq_syscall(struct pt_regs * regs)674 asmlinkage void do_rseq_syscall(struct pt_regs *regs)
675 {
676 rseq_syscall(regs);
677 }
678 #endif
679
680 /*
681 * Compile-time assertions for siginfo_t offsets. Check NSIG* as well, as
682 * changes likely come with new fields that should be added below.
683 */
684 static_assert(NSIGILL == 11);
685 static_assert(NSIGFPE == 15);
686 static_assert(NSIGSEGV == 10);
687 static_assert(NSIGBUS == 5);
688 static_assert(NSIGTRAP == 6);
689 static_assert(NSIGCHLD == 6);
690 static_assert(NSIGSYS == 2);
691 static_assert(sizeof(siginfo_t) == 128);
692 static_assert(__alignof__(siginfo_t) == 4);
693 static_assert(offsetof(siginfo_t, si_signo) == 0x00);
694 static_assert(offsetof(siginfo_t, si_errno) == 0x04);
695 static_assert(offsetof(siginfo_t, si_code) == 0x08);
696 static_assert(offsetof(siginfo_t, si_pid) == 0x0c);
697 static_assert(offsetof(siginfo_t, si_uid) == 0x10);
698 static_assert(offsetof(siginfo_t, si_tid) == 0x0c);
699 static_assert(offsetof(siginfo_t, si_overrun) == 0x10);
700 static_assert(offsetof(siginfo_t, si_status) == 0x14);
701 static_assert(offsetof(siginfo_t, si_utime) == 0x18);
702 static_assert(offsetof(siginfo_t, si_stime) == 0x1c);
703 static_assert(offsetof(siginfo_t, si_value) == 0x14);
704 static_assert(offsetof(siginfo_t, si_int) == 0x14);
705 static_assert(offsetof(siginfo_t, si_ptr) == 0x14);
706 static_assert(offsetof(siginfo_t, si_addr) == 0x0c);
707 static_assert(offsetof(siginfo_t, si_addr_lsb) == 0x10);
708 static_assert(offsetof(siginfo_t, si_lower) == 0x14);
709 static_assert(offsetof(siginfo_t, si_upper) == 0x18);
710 static_assert(offsetof(siginfo_t, si_pkey) == 0x14);
711 static_assert(offsetof(siginfo_t, si_perf_data) == 0x10);
712 static_assert(offsetof(siginfo_t, si_perf_type) == 0x14);
713 static_assert(offsetof(siginfo_t, si_perf_flags) == 0x18);
714 static_assert(offsetof(siginfo_t, si_band) == 0x0c);
715 static_assert(offsetof(siginfo_t, si_fd) == 0x10);
716 static_assert(offsetof(siginfo_t, si_call_addr) == 0x0c);
717 static_assert(offsetof(siginfo_t, si_syscall) == 0x10);
718 static_assert(offsetof(siginfo_t, si_arch) == 0x14);
719