2 * Copyright (C) 1991, 1992 Linus Torvalds
3 * Copyright (C) 2000, 2001, 2002 Andi Kleen SuSE Labs
5 * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson
6 * 2000-06-20 Pentium III FXSR, SSE support by Gareth Hughes
7 * 2000-2002 x86-64 support by Andi Kleen
10 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12 #include <linux/sched.h>
14 #include <linux/smp.h>
15 #include <linux/kernel.h>
16 #include <linux/errno.h>
17 #include <linux/wait.h>
18 #include <linux/tracehook.h>
19 #include <linux/unistd.h>
20 #include <linux/stddef.h>
21 #include <linux/personality.h>
22 #include <linux/uaccess.h>
23 #include <linux/user-return-notifier.h>
24 #include <linux/uprobes.h>
25 #include <linux/context_tracking.h>
27 #include <asm/processor.h>
28 #include <asm/ucontext.h>
29 #include <asm/fpu/internal.h>
30 #include <asm/fpu/signal.h>
33 #include <asm/sighandling.h>
37 #include <asm/proto.h>
38 #include <asm/ia32_unistd.h>
39 #endif /* CONFIG_X86_64 */
41 #include <asm/syscall.h>
42 #include <asm/syscalls.h>
44 #include <asm/sigframe.h>
45 #include <asm/signal.h>
47 #define COPY(x) do { \
48 get_user_ex(regs->x, &sc->x); \
51 #define GET_SEG(seg) ({ \
53 get_user_ex(tmp, &sc->seg); \
57 #define COPY_SEG(seg) do { \
58 regs->seg = GET_SEG(seg); \
61 #define COPY_SEG_CPL3(seg) do { \
62 regs->seg = GET_SEG(seg) | 3; \
67 * If regs->ss will cause an IRET fault, change it. Otherwise leave it
68 * alone. Using this generally makes no sense unless
69 * user_64bit_mode(regs) would return true.
71 static void force_valid_ss(struct pt_regs *regs)
74 asm volatile ("lar %[old_ss], %[ar]\n\t"
75 "jz 1f\n\t" /* If invalid: */
76 "xorl %[ar], %[ar]\n\t" /* set ar = 0 */
79 : [old_ss] "rm" ((u16)regs->ss));
82 * For a valid 64-bit user context, we need DPL 3, type
83 * read-write data or read-write exp-down data, and S and P
84 * set. We can't use VERW because VERW doesn't check the
87 ar &= AR_DPL_MASK | AR_S | AR_P | AR_TYPE_MASK;
88 if (ar != (AR_DPL3 | AR_S | AR_P | AR_TYPE_RWDATA) &&
89 ar != (AR_DPL3 | AR_S | AR_P | AR_TYPE_RWDATA_EXPDOWN))
94 static int restore_sigcontext(struct pt_regs *regs,
95 struct sigcontext __user *sc,
96 unsigned long uc_flags)
98 unsigned long buf_val;
100 unsigned int tmpflags;
101 unsigned int err = 0;
103 /* Always make any pending restarted system calls return -EINTR */
104 current->restart_block.fn = do_no_restart_syscall;
109 set_user_gs(regs, GET_SEG(gs));
113 #endif /* CONFIG_X86_32 */
115 COPY(di); COPY(si); COPY(bp); COPY(sp); COPY(bx);
116 COPY(dx); COPY(cx); COPY(ip); COPY(ax);
127 #endif /* CONFIG_X86_64 */
132 get_user_ex(tmpflags, &sc->flags);
133 regs->flags = (regs->flags & ~FIX_EFLAGS) | (tmpflags & FIX_EFLAGS);
134 regs->orig_ax = -1; /* disable syscall checks */
136 get_user_ex(buf_val, &sc->fpstate);
137 buf = (void __user *)buf_val;
138 } get_user_catch(err);
142 * Fix up SS if needed for the benefit of old DOSEMU and
145 if (unlikely(!(uc_flags & UC_STRICT_RESTORE_SS) && user_64bit_mode(regs)))
146 force_valid_ss(regs);
149 err |= fpu__restore_sig(buf, IS_ENABLED(CONFIG_X86_32));
156 int setup_sigcontext(struct sigcontext __user *sc, void __user *fpstate,
157 struct pt_regs *regs, unsigned long mask)
164 put_user_ex(get_user_gs(regs), (unsigned int __user *)&sc->gs);
165 put_user_ex(regs->fs, (unsigned int __user *)&sc->fs);
166 put_user_ex(regs->es, (unsigned int __user *)&sc->es);
167 put_user_ex(regs->ds, (unsigned int __user *)&sc->ds);
168 #endif /* CONFIG_X86_32 */
170 put_user_ex(regs->di, &sc->di);
171 put_user_ex(regs->si, &sc->si);
172 put_user_ex(regs->bp, &sc->bp);
173 put_user_ex(regs->sp, &sc->sp);
174 put_user_ex(regs->bx, &sc->bx);
175 put_user_ex(regs->dx, &sc->dx);
176 put_user_ex(regs->cx, &sc->cx);
177 put_user_ex(regs->ax, &sc->ax);
179 put_user_ex(regs->r8, &sc->r8);
180 put_user_ex(regs->r9, &sc->r9);
181 put_user_ex(regs->r10, &sc->r10);
182 put_user_ex(regs->r11, &sc->r11);
183 put_user_ex(regs->r12, &sc->r12);
184 put_user_ex(regs->r13, &sc->r13);
185 put_user_ex(regs->r14, &sc->r14);
186 put_user_ex(regs->r15, &sc->r15);
187 #endif /* CONFIG_X86_64 */
189 put_user_ex(current->thread.trap_nr, &sc->trapno);
190 put_user_ex(current->thread.error_code, &sc->err);
191 put_user_ex(regs->ip, &sc->ip);
193 put_user_ex(regs->cs, (unsigned int __user *)&sc->cs);
194 put_user_ex(regs->flags, &sc->flags);
195 put_user_ex(regs->sp, &sc->sp_at_signal);
196 put_user_ex(regs->ss, (unsigned int __user *)&sc->ss);
197 #else /* !CONFIG_X86_32 */
198 put_user_ex(regs->flags, &sc->flags);
199 put_user_ex(regs->cs, &sc->cs);
200 put_user_ex(0, &sc->gs);
201 put_user_ex(0, &sc->fs);
202 put_user_ex(regs->ss, &sc->ss);
203 #endif /* CONFIG_X86_32 */
205 put_user_ex(fpstate, &sc->fpstate);
207 /* non-iBCS2 extensions.. */
208 put_user_ex(mask, &sc->oldmask);
209 put_user_ex(current->thread.cr2, &sc->cr2);
210 } put_user_catch(err);
216 * Set up a signal frame.
220 * Determine which stack to use..
222 static unsigned long align_sigframe(unsigned long sp)
226 * Align the stack pointer according to the i386 ABI,
227 * i.e. so that on function entry ((sp + 4) & 15) == 0.
229 sp = ((sp + 4) & -16ul) - 4;
230 #else /* !CONFIG_X86_32 */
231 sp = round_down(sp, 16) - 8;
237 get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size,
238 void __user **fpstate)
240 /* Default to using normal stack */
241 unsigned long math_size = 0;
242 unsigned long sp = regs->sp;
243 unsigned long buf_fx = 0;
244 int onsigstack = on_sig_stack(sp);
245 struct fpu *fpu = ¤t->thread.fpu;
248 if (IS_ENABLED(CONFIG_X86_64))
251 /* This is the X/Open sanctioned signal stack switching. */
252 if (ka->sa.sa_flags & SA_ONSTACK) {
253 if (sas_ss_flags(sp) == 0)
254 sp = current->sas_ss_sp + current->sas_ss_size;
255 } else if (IS_ENABLED(CONFIG_X86_32) &&
257 (regs->ss & 0xffff) != __USER_DS &&
258 !(ka->sa.sa_flags & SA_RESTORER) &&
259 ka->sa.sa_restorer) {
260 /* This is the legacy signal stack switching. */
261 sp = (unsigned long) ka->sa.sa_restorer;
264 if (fpu->fpstate_active) {
265 sp = fpu__alloc_mathframe(sp, IS_ENABLED(CONFIG_X86_32),
266 &buf_fx, &math_size);
267 *fpstate = (void __user *)sp;
270 sp = align_sigframe(sp - frame_size);
273 * If we are on the alternate signal stack and would overflow it, don't.
274 * Return an always-bogus address instead so we will die with SIGSEGV.
276 if (onsigstack && !likely(on_sig_stack(sp)))
277 return (void __user *)-1L;
279 /* save i387 and extended state */
280 if (fpu->fpstate_active &&
281 copy_fpstate_to_sigframe(*fpstate, (void __user *)buf_fx, math_size) < 0)
282 return (void __user *)-1L;
284 return (void __user *)sp;
288 static const struct {
292 } __attribute__((packed)) retcode = {
293 0xb858, /* popl %eax; movl $..., %eax */
295 0x80cd, /* int $0x80 */
298 static const struct {
303 } __attribute__((packed)) rt_retcode = {
304 0xb8, /* movl $..., %eax */
306 0x80cd, /* int $0x80 */
311 __setup_frame(int sig, struct ksignal *ksig, sigset_t *set,
312 struct pt_regs *regs)
314 struct sigframe __user *frame;
315 void __user *restorer;
317 void __user *fpstate = NULL;
319 frame = get_sigframe(&ksig->ka, regs, sizeof(*frame), &fpstate);
321 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
324 if (__put_user(sig, &frame->sig))
327 if (setup_sigcontext(&frame->sc, fpstate, regs, set->sig[0]))
330 if (_NSIG_WORDS > 1) {
331 if (__copy_to_user(&frame->extramask, &set->sig[1],
332 sizeof(frame->extramask)))
336 if (current->mm->context.vdso)
337 restorer = current->mm->context.vdso +
338 vdso_image_32.sym___kernel_sigreturn;
340 restorer = &frame->retcode;
341 if (ksig->ka.sa.sa_flags & SA_RESTORER)
342 restorer = ksig->ka.sa.sa_restorer;
344 /* Set up to return from userspace. */
345 err |= __put_user(restorer, &frame->pretcode);
348 * This is popl %eax ; movl $__NR_sigreturn, %eax ; int $0x80
350 * WE DO NOT USE IT ANY MORE! It's only left here for historical
351 * reasons and because gdb uses it as a signature to notice
352 * signal handler stack frames.
354 err |= __put_user(*((u64 *)&retcode), (u64 *)frame->retcode);
359 /* Set up registers for signal handler */
360 regs->sp = (unsigned long)frame;
361 regs->ip = (unsigned long)ksig->ka.sa.sa_handler;
362 regs->ax = (unsigned long)sig;
366 regs->ds = __USER_DS;
367 regs->es = __USER_DS;
368 regs->ss = __USER_DS;
369 regs->cs = __USER_CS;
374 static int __setup_rt_frame(int sig, struct ksignal *ksig,
375 sigset_t *set, struct pt_regs *regs)
377 struct rt_sigframe __user *frame;
378 void __user *restorer;
380 void __user *fpstate = NULL;
382 frame = get_sigframe(&ksig->ka, regs, sizeof(*frame), &fpstate);
384 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
388 put_user_ex(sig, &frame->sig);
389 put_user_ex(&frame->info, &frame->pinfo);
390 put_user_ex(&frame->uc, &frame->puc);
392 /* Create the ucontext. */
393 if (boot_cpu_has(X86_FEATURE_XSAVE))
394 put_user_ex(UC_FP_XSTATE, &frame->uc.uc_flags);
396 put_user_ex(0, &frame->uc.uc_flags);
397 put_user_ex(0, &frame->uc.uc_link);
398 save_altstack_ex(&frame->uc.uc_stack, regs->sp);
400 /* Set up to return from userspace. */
401 restorer = current->mm->context.vdso +
402 vdso_image_32.sym___kernel_rt_sigreturn;
403 if (ksig->ka.sa.sa_flags & SA_RESTORER)
404 restorer = ksig->ka.sa.sa_restorer;
405 put_user_ex(restorer, &frame->pretcode);
408 * This is movl $__NR_rt_sigreturn, %ax ; int $0x80
410 * WE DO NOT USE IT ANY MORE! It's only left here for historical
411 * reasons and because gdb uses it as a signature to notice
412 * signal handler stack frames.
414 put_user_ex(*((u64 *)&rt_retcode), (u64 *)frame->retcode);
415 } put_user_catch(err);
417 err |= copy_siginfo_to_user(&frame->info, &ksig->info);
418 err |= setup_sigcontext(&frame->uc.uc_mcontext, fpstate,
420 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
425 /* Set up registers for signal handler */
426 regs->sp = (unsigned long)frame;
427 regs->ip = (unsigned long)ksig->ka.sa.sa_handler;
428 regs->ax = (unsigned long)sig;
429 regs->dx = (unsigned long)&frame->info;
430 regs->cx = (unsigned long)&frame->uc;
432 regs->ds = __USER_DS;
433 regs->es = __USER_DS;
434 regs->ss = __USER_DS;
435 regs->cs = __USER_CS;
439 #else /* !CONFIG_X86_32 */
440 static unsigned long frame_uc_flags(struct pt_regs *regs)
444 if (boot_cpu_has(X86_FEATURE_XSAVE))
445 flags = UC_FP_XSTATE | UC_SIGCONTEXT_SS;
447 flags = UC_SIGCONTEXT_SS;
449 if (likely(user_64bit_mode(regs)))
450 flags |= UC_STRICT_RESTORE_SS;
455 static int __setup_rt_frame(int sig, struct ksignal *ksig,
456 sigset_t *set, struct pt_regs *regs)
458 struct rt_sigframe __user *frame;
459 void __user *fp = NULL;
460 unsigned long uc_flags;
463 frame = get_sigframe(&ksig->ka, regs, sizeof(struct rt_sigframe), &fp);
465 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
468 if (ksig->ka.sa.sa_flags & SA_SIGINFO) {
469 if (copy_siginfo_to_user(&frame->info, &ksig->info))
473 uc_flags = frame_uc_flags(regs);
476 /* Create the ucontext. */
477 put_user_ex(uc_flags, &frame->uc.uc_flags);
478 put_user_ex(0, &frame->uc.uc_link);
479 save_altstack_ex(&frame->uc.uc_stack, regs->sp);
481 /* Set up to return from userspace. If provided, use a stub
482 already in userspace. */
483 /* x86-64 should always use SA_RESTORER. */
484 if (ksig->ka.sa.sa_flags & SA_RESTORER) {
485 put_user_ex(ksig->ka.sa.sa_restorer, &frame->pretcode);
487 /* could use a vstub here */
490 } put_user_catch(err);
492 err |= setup_sigcontext(&frame->uc.uc_mcontext, fp, regs, set->sig[0]);
493 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
498 /* Set up registers for signal handler */
500 /* In case the signal handler was declared without prototypes */
503 /* This also works for non SA_SIGINFO handlers because they expect the
504 next argument after the signal number on the stack. */
505 regs->si = (unsigned long)&frame->info;
506 regs->dx = (unsigned long)&frame->uc;
507 regs->ip = (unsigned long) ksig->ka.sa.sa_handler;
509 regs->sp = (unsigned long)frame;
512 * Set up the CS and SS registers to run signal handlers in
513 * 64-bit mode, even if the handler happens to be interrupting
514 * 32-bit or 16-bit code.
516 * SS is subtle. In 64-bit mode, we don't need any particular
517 * SS descriptor, but we do need SS to be valid. It's possible
518 * that the old SS is entirely bogus -- this can happen if the
519 * signal we're trying to deliver is #GP or #SS caused by a bad
520 * SS value. We also have a compatbility issue here: DOSEMU
521 * relies on the contents of the SS register indicating the
522 * SS value at the time of the signal, even though that code in
523 * DOSEMU predates sigreturn's ability to restore SS. (DOSEMU
524 * avoids relying on sigreturn to restore SS; instead it uses
525 * a trampoline.) So we do our best: if the old SS was valid,
526 * we keep it. Otherwise we replace it.
528 regs->cs = __USER_CS;
530 if (unlikely(regs->ss != __USER_DS))
531 force_valid_ss(regs);
535 #endif /* CONFIG_X86_32 */
537 static int x32_setup_rt_frame(struct ksignal *ksig,
538 compat_sigset_t *set,
539 struct pt_regs *regs)
541 #ifdef CONFIG_X86_X32_ABI
542 struct rt_sigframe_x32 __user *frame;
543 unsigned long uc_flags;
544 void __user *restorer;
546 void __user *fpstate = NULL;
548 frame = get_sigframe(&ksig->ka, regs, sizeof(*frame), &fpstate);
550 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
553 if (ksig->ka.sa.sa_flags & SA_SIGINFO) {
554 if (__copy_siginfo_to_user32(&frame->info, &ksig->info, true))
558 uc_flags = frame_uc_flags(regs);
561 /* Create the ucontext. */
562 put_user_ex(uc_flags, &frame->uc.uc_flags);
563 put_user_ex(0, &frame->uc.uc_link);
564 compat_save_altstack_ex(&frame->uc.uc_stack, regs->sp);
565 put_user_ex(0, &frame->uc.uc__pad0);
567 if (ksig->ka.sa.sa_flags & SA_RESTORER) {
568 restorer = ksig->ka.sa.sa_restorer;
570 /* could use a vstub here */
574 put_user_ex(restorer, &frame->pretcode);
575 } put_user_catch(err);
577 err |= setup_sigcontext(&frame->uc.uc_mcontext, fpstate,
579 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
584 /* Set up registers for signal handler */
585 regs->sp = (unsigned long) frame;
586 regs->ip = (unsigned long) ksig->ka.sa.sa_handler;
588 /* We use the x32 calling convention here... */
589 regs->di = ksig->sig;
590 regs->si = (unsigned long) &frame->info;
591 regs->dx = (unsigned long) &frame->uc;
593 loadsegment(ds, __USER_DS);
594 loadsegment(es, __USER_DS);
596 regs->cs = __USER_CS;
597 regs->ss = __USER_DS;
598 #endif /* CONFIG_X86_X32_ABI */
604 * Do a signal return; undo the signal stack.
607 asmlinkage unsigned long sys_sigreturn(void)
609 struct pt_regs *regs = current_pt_regs();
610 struct sigframe __user *frame;
613 frame = (struct sigframe __user *)(regs->sp - 8);
615 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
617 if (__get_user(set.sig[0], &frame->sc.oldmask) || (_NSIG_WORDS > 1
618 && __copy_from_user(&set.sig[1], &frame->extramask,
619 sizeof(frame->extramask))))
622 set_current_blocked(&set);
625 * x86_32 has no uc_flags bits relevant to restore_sigcontext.
626 * Save a few cycles by skipping the __get_user.
628 if (restore_sigcontext(regs, &frame->sc, 0))
633 signal_fault(regs, frame, "sigreturn");
637 #endif /* CONFIG_X86_32 */
639 asmlinkage long sys_rt_sigreturn(void)
641 struct pt_regs *regs = current_pt_regs();
642 struct rt_sigframe __user *frame;
644 unsigned long uc_flags;
646 frame = (struct rt_sigframe __user *)(regs->sp - sizeof(long));
647 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
649 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
651 if (__get_user(uc_flags, &frame->uc.uc_flags))
654 set_current_blocked(&set);
656 if (restore_sigcontext(regs, &frame->uc.uc_mcontext, uc_flags))
659 if (restore_altstack(&frame->uc.uc_stack))
665 signal_fault(regs, frame, "rt_sigreturn");
669 static inline int is_ia32_compat_frame(struct ksignal *ksig)
671 return IS_ENABLED(CONFIG_IA32_EMULATION) &&
672 ksig->ka.sa.sa_flags & SA_IA32_ABI;
675 static inline int is_ia32_frame(struct ksignal *ksig)
677 return IS_ENABLED(CONFIG_X86_32) || is_ia32_compat_frame(ksig);
680 static inline int is_x32_frame(struct ksignal *ksig)
682 return IS_ENABLED(CONFIG_X86_X32_ABI) &&
683 ksig->ka.sa.sa_flags & SA_X32_ABI;
687 setup_rt_frame(struct ksignal *ksig, struct pt_regs *regs)
689 int usig = ksig->sig;
690 sigset_t *set = sigmask_to_save();
691 compat_sigset_t *cset = (compat_sigset_t *) set;
693 /* Set up the stack frame */
694 if (is_ia32_frame(ksig)) {
695 if (ksig->ka.sa.sa_flags & SA_SIGINFO)
696 return ia32_setup_rt_frame(usig, ksig, cset, regs);
698 return ia32_setup_frame(usig, ksig, cset, regs);
699 } else if (is_x32_frame(ksig)) {
700 return x32_setup_rt_frame(ksig, cset, regs);
702 return __setup_rt_frame(ksig->sig, ksig, set, regs);
707 handle_signal(struct ksignal *ksig, struct pt_regs *regs)
709 bool stepping, failed;
710 struct fpu *fpu = ¤t->thread.fpu;
712 if (v8086_mode(regs))
713 save_v86_state((struct kernel_vm86_regs *) regs, VM86_SIGNAL);
715 /* Are we from a system call? */
716 if (syscall_get_nr(current, regs) >= 0) {
717 /* If so, check system call restarting.. */
718 switch (syscall_get_error(current, regs)) {
719 case -ERESTART_RESTARTBLOCK:
720 case -ERESTARTNOHAND:
725 if (!(ksig->ka.sa.sa_flags & SA_RESTART)) {
730 case -ERESTARTNOINTR:
731 regs->ax = regs->orig_ax;
738 * If TF is set due to a debugger (TIF_FORCED_TF), clear TF now
739 * so that register information in the sigcontext is correct and
740 * then notify the tracer before entering the signal handler.
742 stepping = test_thread_flag(TIF_SINGLESTEP);
744 user_disable_single_step(current);
746 failed = (setup_rt_frame(ksig, regs) < 0);
749 * Clear the direction flag as per the ABI for function entry.
751 * Clear RF when entering the signal handler, because
752 * it might disable possible debug exception from the
755 * Clear TF for the case when it wasn't set by debugger to
756 * avoid the recursive send_sigtrap() in SIGTRAP handler.
758 regs->flags &= ~(X86_EFLAGS_DF|X86_EFLAGS_RF|X86_EFLAGS_TF);
760 * Ensure the signal handler starts with the new fpu state.
762 if (fpu->fpstate_active)
765 signal_setup_done(failed, ksig, stepping);
768 static inline unsigned long get_nr_restart_syscall(const struct pt_regs *regs)
770 #ifdef CONFIG_IA32_EMULATION
771 if (current_thread_info()->status & TS_COMPAT_RESTART)
772 return __NR_ia32_restart_syscall;
774 #ifdef CONFIG_X86_X32_ABI
775 return __NR_restart_syscall | (regs->orig_ax & __X32_SYSCALL_BIT);
777 return __NR_restart_syscall;
782 * Note that 'init' is a special process: it doesn't get signals it doesn't
783 * want to handle. Thus you cannot kill init even with a SIGKILL even by
786 void do_signal(struct pt_regs *regs)
790 if (get_signal(&ksig)) {
791 /* Whee! Actually deliver the signal. */
792 handle_signal(&ksig, regs);
796 /* Did we come from a system call? */
797 if (syscall_get_nr(current, regs) >= 0) {
798 /* Restart the system call - no handlers present */
799 switch (syscall_get_error(current, regs)) {
800 case -ERESTARTNOHAND:
802 case -ERESTARTNOINTR:
803 regs->ax = regs->orig_ax;
807 case -ERESTART_RESTARTBLOCK:
808 regs->ax = get_nr_restart_syscall(regs);
815 * If there's no signal to deliver, we just put the saved sigmask
818 restore_saved_sigmask();
821 void signal_fault(struct pt_regs *regs, void __user *frame, char *where)
823 struct task_struct *me = current;
825 if (show_unhandled_signals && printk_ratelimit()) {
827 "%s[%d] bad frame in %s frame:%p ip:%lx sp:%lx orax:%lx",
828 task_pid_nr(current) > 1 ? KERN_INFO : KERN_EMERG,
829 me->comm, me->pid, where, frame,
830 regs->ip, regs->sp, regs->orig_ax);
831 print_vma_addr(" in ", regs->ip);
835 force_sig(SIGSEGV, me);
838 #ifdef CONFIG_X86_X32_ABI
839 asmlinkage long sys32_x32_rt_sigreturn(void)
841 struct pt_regs *regs = current_pt_regs();
842 struct rt_sigframe_x32 __user *frame;
844 unsigned long uc_flags;
846 frame = (struct rt_sigframe_x32 __user *)(regs->sp - 8);
848 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
850 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
852 if (__get_user(uc_flags, &frame->uc.uc_flags))
855 set_current_blocked(&set);
857 if (restore_sigcontext(regs, &frame->uc.uc_mcontext, uc_flags))
860 if (compat_restore_altstack(&frame->uc.uc_stack))
866 signal_fault(regs, frame, "x32 rt_sigreturn");