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
9 #include <linux/sched.h>
11 #include <linux/smp.h>
12 #include <linux/kernel.h>
13 #include <linux/errno.h>
14 #include <linux/wait.h>
15 #include <linux/tracehook.h>
16 #include <linux/unistd.h>
17 #include <linux/stddef.h>
18 #include <linux/personality.h>
19 #include <linux/uaccess.h>
20 #include <linux/user-return-notifier.h>
21 #include <linux/uprobes.h>
23 #include <asm/processor.h>
24 #include <asm/ucontext.h>
26 #include <asm/fpu-internal.h>
29 #include <asm/sighandling.h>
32 #include <asm/proto.h>
33 #include <asm/ia32_unistd.h>
34 #include <asm/sys_ia32.h>
35 #endif /* CONFIG_X86_64 */
37 #include <asm/syscall.h>
38 #include <asm/syscalls.h>
40 #include <asm/sigframe.h>
43 # define FIX_EFLAGS (__FIX_EFLAGS | X86_EFLAGS_RF)
45 # define FIX_EFLAGS __FIX_EFLAGS
48 #define COPY(x) do { \
49 get_user_ex(regs->x, &sc->x); \
52 #define GET_SEG(seg) ({ \
54 get_user_ex(tmp, &sc->seg); \
58 #define COPY_SEG(seg) do { \
59 regs->seg = GET_SEG(seg); \
62 #define COPY_SEG_CPL3(seg) do { \
63 regs->seg = GET_SEG(seg) | 3; \
66 int restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc,
70 unsigned int tmpflags;
73 /* Always make any pending restarted system calls return -EINTR */
74 current_thread_info()->restart_block.fn = do_no_restart_syscall;
79 set_user_gs(regs, GET_SEG(gs));
83 #endif /* CONFIG_X86_32 */
85 COPY(di); COPY(si); COPY(bp); COPY(sp); COPY(bx);
86 COPY(dx); COPY(cx); COPY(ip);
97 #endif /* CONFIG_X86_64 */
102 #else /* !CONFIG_X86_32 */
103 /* Kernel saves and restores only the CS segment register on signals,
104 * which is the bare minimum needed to allow mixed 32/64-bit code.
105 * App's signal handler can save/restore other segments if needed. */
107 #endif /* CONFIG_X86_32 */
109 get_user_ex(tmpflags, &sc->flags);
110 regs->flags = (regs->flags & ~FIX_EFLAGS) | (tmpflags & FIX_EFLAGS);
111 regs->orig_ax = -1; /* disable syscall checks */
113 get_user_ex(buf, &sc->fpstate);
114 err |= restore_i387_xstate(buf);
116 get_user_ex(*pax, &sc->ax);
117 } get_user_catch(err);
122 int setup_sigcontext(struct sigcontext __user *sc, void __user *fpstate,
123 struct pt_regs *regs, unsigned long mask)
130 put_user_ex(get_user_gs(regs), (unsigned int __user *)&sc->gs);
131 put_user_ex(regs->fs, (unsigned int __user *)&sc->fs);
132 put_user_ex(regs->es, (unsigned int __user *)&sc->es);
133 put_user_ex(regs->ds, (unsigned int __user *)&sc->ds);
134 #endif /* CONFIG_X86_32 */
136 put_user_ex(regs->di, &sc->di);
137 put_user_ex(regs->si, &sc->si);
138 put_user_ex(regs->bp, &sc->bp);
139 put_user_ex(regs->sp, &sc->sp);
140 put_user_ex(regs->bx, &sc->bx);
141 put_user_ex(regs->dx, &sc->dx);
142 put_user_ex(regs->cx, &sc->cx);
143 put_user_ex(regs->ax, &sc->ax);
145 put_user_ex(regs->r8, &sc->r8);
146 put_user_ex(regs->r9, &sc->r9);
147 put_user_ex(regs->r10, &sc->r10);
148 put_user_ex(regs->r11, &sc->r11);
149 put_user_ex(regs->r12, &sc->r12);
150 put_user_ex(regs->r13, &sc->r13);
151 put_user_ex(regs->r14, &sc->r14);
152 put_user_ex(regs->r15, &sc->r15);
153 #endif /* CONFIG_X86_64 */
155 put_user_ex(current->thread.trap_nr, &sc->trapno);
156 put_user_ex(current->thread.error_code, &sc->err);
157 put_user_ex(regs->ip, &sc->ip);
159 put_user_ex(regs->cs, (unsigned int __user *)&sc->cs);
160 put_user_ex(regs->flags, &sc->flags);
161 put_user_ex(regs->sp, &sc->sp_at_signal);
162 put_user_ex(regs->ss, (unsigned int __user *)&sc->ss);
163 #else /* !CONFIG_X86_32 */
164 put_user_ex(regs->flags, &sc->flags);
165 put_user_ex(regs->cs, &sc->cs);
166 put_user_ex(0, &sc->gs);
167 put_user_ex(0, &sc->fs);
168 #endif /* CONFIG_X86_32 */
170 put_user_ex(fpstate, &sc->fpstate);
172 /* non-iBCS2 extensions.. */
173 put_user_ex(mask, &sc->oldmask);
174 put_user_ex(current->thread.cr2, &sc->cr2);
175 } put_user_catch(err);
181 * Set up a signal frame.
185 * Determine which stack to use..
187 static unsigned long align_sigframe(unsigned long sp)
191 * Align the stack pointer according to the i386 ABI,
192 * i.e. so that on function entry ((sp + 4) & 15) == 0.
194 sp = ((sp + 4) & -16ul) - 4;
195 #else /* !CONFIG_X86_32 */
196 sp = round_down(sp, 16) - 8;
201 static inline void __user *
202 get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size,
203 void __user **fpstate)
205 /* Default to using normal stack */
206 unsigned long sp = regs->sp;
207 int onsigstack = on_sig_stack(sp);
212 #endif /* CONFIG_X86_64 */
215 /* This is the X/Open sanctioned signal stack switching. */
216 if (ka->sa.sa_flags & SA_ONSTACK) {
217 if (current->sas_ss_size)
218 sp = current->sas_ss_sp + current->sas_ss_size;
221 /* This is the legacy signal stack switching. */
222 if ((regs->ss & 0xffff) != __USER_DS &&
223 !(ka->sa.sa_flags & SA_RESTORER) &&
225 sp = (unsigned long) ka->sa.sa_restorer;
226 #endif /* CONFIG_X86_32 */
231 sp -= sig_xstate_size;
233 sp = round_down(sp, 64);
234 #endif /* CONFIG_X86_64 */
235 *fpstate = (void __user *)sp;
238 sp = align_sigframe(sp - frame_size);
241 * If we are on the alternate signal stack and would overflow it, don't.
242 * Return an always-bogus address instead so we will die with SIGSEGV.
244 if (onsigstack && !likely(on_sig_stack(sp)))
245 return (void __user *)-1L;
247 /* save i387 state */
248 if (used_math() && save_i387_xstate(*fpstate) < 0)
249 return (void __user *)-1L;
251 return (void __user *)sp;
255 static const struct {
259 } __attribute__((packed)) retcode = {
260 0xb858, /* popl %eax; movl $..., %eax */
262 0x80cd, /* int $0x80 */
265 static const struct {
270 } __attribute__((packed)) rt_retcode = {
271 0xb8, /* movl $..., %eax */
273 0x80cd, /* int $0x80 */
278 __setup_frame(int sig, struct k_sigaction *ka, sigset_t *set,
279 struct pt_regs *regs)
281 struct sigframe __user *frame;
282 void __user *restorer;
284 void __user *fpstate = NULL;
286 frame = get_sigframe(ka, regs, sizeof(*frame), &fpstate);
288 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
291 if (__put_user(sig, &frame->sig))
294 if (setup_sigcontext(&frame->sc, fpstate, regs, set->sig[0]))
297 if (_NSIG_WORDS > 1) {
298 if (__copy_to_user(&frame->extramask, &set->sig[1],
299 sizeof(frame->extramask)))
303 if (current->mm->context.vdso)
304 restorer = VDSO32_SYMBOL(current->mm->context.vdso, sigreturn);
306 restorer = &frame->retcode;
307 if (ka->sa.sa_flags & SA_RESTORER)
308 restorer = ka->sa.sa_restorer;
310 /* Set up to return from userspace. */
311 err |= __put_user(restorer, &frame->pretcode);
314 * This is popl %eax ; movl $__NR_sigreturn, %eax ; int $0x80
316 * WE DO NOT USE IT ANY MORE! It's only left here for historical
317 * reasons and because gdb uses it as a signature to notice
318 * signal handler stack frames.
320 err |= __put_user(*((u64 *)&retcode), (u64 *)frame->retcode);
325 /* Set up registers for signal handler */
326 regs->sp = (unsigned long)frame;
327 regs->ip = (unsigned long)ka->sa.sa_handler;
328 regs->ax = (unsigned long)sig;
332 regs->ds = __USER_DS;
333 regs->es = __USER_DS;
334 regs->ss = __USER_DS;
335 regs->cs = __USER_CS;
340 static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
341 sigset_t *set, struct pt_regs *regs)
343 struct rt_sigframe __user *frame;
344 void __user *restorer;
346 void __user *fpstate = NULL;
348 frame = get_sigframe(ka, regs, sizeof(*frame), &fpstate);
350 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
354 put_user_ex(sig, &frame->sig);
355 put_user_ex(&frame->info, &frame->pinfo);
356 put_user_ex(&frame->uc, &frame->puc);
357 err |= copy_siginfo_to_user(&frame->info, info);
359 /* Create the ucontext. */
361 put_user_ex(UC_FP_XSTATE, &frame->uc.uc_flags);
363 put_user_ex(0, &frame->uc.uc_flags);
364 put_user_ex(0, &frame->uc.uc_link);
365 put_user_ex(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
366 put_user_ex(sas_ss_flags(regs->sp),
367 &frame->uc.uc_stack.ss_flags);
368 put_user_ex(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
369 err |= setup_sigcontext(&frame->uc.uc_mcontext, fpstate,
371 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
373 /* Set up to return from userspace. */
374 restorer = VDSO32_SYMBOL(current->mm->context.vdso, rt_sigreturn);
375 if (ka->sa.sa_flags & SA_RESTORER)
376 restorer = ka->sa.sa_restorer;
377 put_user_ex(restorer, &frame->pretcode);
380 * This is movl $__NR_rt_sigreturn, %ax ; int $0x80
382 * WE DO NOT USE IT ANY MORE! It's only left here for historical
383 * reasons and because gdb uses it as a signature to notice
384 * signal handler stack frames.
386 put_user_ex(*((u64 *)&rt_retcode), (u64 *)frame->retcode);
387 } put_user_catch(err);
392 /* Set up registers for signal handler */
393 regs->sp = (unsigned long)frame;
394 regs->ip = (unsigned long)ka->sa.sa_handler;
395 regs->ax = (unsigned long)sig;
396 regs->dx = (unsigned long)&frame->info;
397 regs->cx = (unsigned long)&frame->uc;
399 regs->ds = __USER_DS;
400 regs->es = __USER_DS;
401 regs->ss = __USER_DS;
402 regs->cs = __USER_CS;
406 #else /* !CONFIG_X86_32 */
407 static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
408 sigset_t *set, struct pt_regs *regs)
410 struct rt_sigframe __user *frame;
411 void __user *fp = NULL;
413 struct task_struct *me = current;
415 frame = get_sigframe(ka, regs, sizeof(struct rt_sigframe), &fp);
417 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
420 if (ka->sa.sa_flags & SA_SIGINFO) {
421 if (copy_siginfo_to_user(&frame->info, info))
426 /* Create the ucontext. */
428 put_user_ex(UC_FP_XSTATE, &frame->uc.uc_flags);
430 put_user_ex(0, &frame->uc.uc_flags);
431 put_user_ex(0, &frame->uc.uc_link);
432 put_user_ex(me->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
433 put_user_ex(sas_ss_flags(regs->sp),
434 &frame->uc.uc_stack.ss_flags);
435 put_user_ex(me->sas_ss_size, &frame->uc.uc_stack.ss_size);
436 err |= setup_sigcontext(&frame->uc.uc_mcontext, fp, regs, set->sig[0]);
437 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
439 /* Set up to return from userspace. If provided, use a stub
440 already in userspace. */
441 /* x86-64 should always use SA_RESTORER. */
442 if (ka->sa.sa_flags & SA_RESTORER) {
443 put_user_ex(ka->sa.sa_restorer, &frame->pretcode);
445 /* could use a vstub here */
448 } put_user_catch(err);
453 /* Set up registers for signal handler */
455 /* In case the signal handler was declared without prototypes */
458 /* This also works for non SA_SIGINFO handlers because they expect the
459 next argument after the signal number on the stack. */
460 regs->si = (unsigned long)&frame->info;
461 regs->dx = (unsigned long)&frame->uc;
462 regs->ip = (unsigned long) ka->sa.sa_handler;
464 regs->sp = (unsigned long)frame;
466 /* Set up the CS register to run signal handlers in 64-bit mode,
467 even if the handler happens to be interrupting 32-bit code. */
468 regs->cs = __USER_CS;
472 #endif /* CONFIG_X86_32 */
476 * Atomically swap in the new signal mask, and wait for a signal.
479 sys_sigsuspend(int history0, int history1, old_sigset_t mask)
482 siginitset(&blocked, mask);
483 return sigsuspend(&blocked);
487 sys_sigaction(int sig, const struct old_sigaction __user *act,
488 struct old_sigaction __user *oact)
490 struct k_sigaction new_ka, old_ka;
496 if (!access_ok(VERIFY_READ, act, sizeof(*act)))
500 get_user_ex(new_ka.sa.sa_handler, &act->sa_handler);
501 get_user_ex(new_ka.sa.sa_flags, &act->sa_flags);
502 get_user_ex(mask, &act->sa_mask);
503 get_user_ex(new_ka.sa.sa_restorer, &act->sa_restorer);
504 } get_user_catch(ret);
508 siginitset(&new_ka.sa.sa_mask, mask);
511 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
514 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)))
518 put_user_ex(old_ka.sa.sa_handler, &oact->sa_handler);
519 put_user_ex(old_ka.sa.sa_flags, &oact->sa_flags);
520 put_user_ex(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
521 put_user_ex(old_ka.sa.sa_restorer, &oact->sa_restorer);
522 } put_user_catch(ret);
530 #endif /* CONFIG_X86_32 */
533 sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
534 struct pt_regs *regs)
536 return do_sigaltstack(uss, uoss, regs->sp);
540 * Do a signal return; undo the signal stack.
543 unsigned long sys_sigreturn(struct pt_regs *regs)
545 struct sigframe __user *frame;
549 frame = (struct sigframe __user *)(regs->sp - 8);
551 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
553 if (__get_user(set.sig[0], &frame->sc.oldmask) || (_NSIG_WORDS > 1
554 && __copy_from_user(&set.sig[1], &frame->extramask,
555 sizeof(frame->extramask))))
558 set_current_blocked(&set);
560 if (restore_sigcontext(regs, &frame->sc, &ax))
565 signal_fault(regs, frame, "sigreturn");
569 #endif /* CONFIG_X86_32 */
571 long sys_rt_sigreturn(struct pt_regs *regs)
573 struct rt_sigframe __user *frame;
577 frame = (struct rt_sigframe __user *)(regs->sp - sizeof(long));
578 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
580 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
583 set_current_blocked(&set);
585 if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &ax))
588 if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->sp) == -EFAULT)
594 signal_fault(regs, frame, "rt_sigreturn");
599 * OK, we're invoking a handler:
601 static int signr_convert(int sig)
604 struct thread_info *info = current_thread_info();
606 if (info->exec_domain && info->exec_domain->signal_invmap && sig < 32)
607 return info->exec_domain->signal_invmap[sig];
608 #endif /* CONFIG_X86_32 */
615 #define ia32_setup_frame __setup_frame
616 #define ia32_setup_rt_frame __setup_rt_frame
618 #else /* !CONFIG_X86_32 */
620 #ifdef CONFIG_IA32_EMULATION
621 #define is_ia32 test_thread_flag(TIF_IA32)
622 #else /* !CONFIG_IA32_EMULATION */
624 #endif /* CONFIG_IA32_EMULATION */
626 #ifdef CONFIG_X86_X32_ABI
627 #define is_x32 test_thread_flag(TIF_X32)
629 static int x32_setup_rt_frame(int sig, struct k_sigaction *ka,
630 siginfo_t *info, compat_sigset_t *set,
631 struct pt_regs *regs);
632 #else /* !CONFIG_X86_X32_ABI */
634 #endif /* CONFIG_X86_X32_ABI */
636 int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
637 sigset_t *set, struct pt_regs *regs);
638 int ia32_setup_frame(int sig, struct k_sigaction *ka,
639 sigset_t *set, struct pt_regs *regs);
641 #endif /* CONFIG_X86_32 */
644 setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
645 struct pt_regs *regs)
647 int usig = signr_convert(sig);
648 sigset_t *set = sigmask_to_save();
650 /* Set up the stack frame */
652 if (ka->sa.sa_flags & SA_SIGINFO)
653 return ia32_setup_rt_frame(usig, ka, info, set, regs);
655 return ia32_setup_frame(usig, ka, set, regs);
656 #ifdef CONFIG_X86_X32_ABI
658 return x32_setup_rt_frame(usig, ka, info,
659 (compat_sigset_t *)set, regs);
662 return __setup_rt_frame(sig, ka, info, set, regs);
667 handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
668 struct pt_regs *regs)
670 /* Are we from a system call? */
671 if (syscall_get_nr(current, regs) >= 0) {
672 /* If so, check system call restarting.. */
673 switch (syscall_get_error(current, regs)) {
674 case -ERESTART_RESTARTBLOCK:
675 case -ERESTARTNOHAND:
680 if (!(ka->sa.sa_flags & SA_RESTART)) {
685 case -ERESTARTNOINTR:
686 regs->ax = regs->orig_ax;
693 * If TF is set due to a debugger (TIF_FORCED_TF), clear the TF
694 * flag so that register information in the sigcontext is correct.
696 if (unlikely(regs->flags & X86_EFLAGS_TF) &&
697 likely(test_and_clear_thread_flag(TIF_FORCED_TF)))
698 regs->flags &= ~X86_EFLAGS_TF;
700 if (setup_rt_frame(sig, ka, info, regs) < 0) {
701 force_sigsegv(sig, current);
706 * Clear the direction flag as per the ABI for function entry.
708 regs->flags &= ~X86_EFLAGS_DF;
711 * Clear TF when entering the signal handler, but
712 * notify any tracer that was single-stepping it.
713 * The tracer may want to single-step inside the
716 regs->flags &= ~X86_EFLAGS_TF;
718 signal_delivered(sig, info, ka, regs,
719 test_thread_flag(TIF_SINGLESTEP));
723 #define NR_restart_syscall __NR_restart_syscall
724 #else /* !CONFIG_X86_32 */
725 #define NR_restart_syscall \
726 test_thread_flag(TIF_IA32) ? __NR_ia32_restart_syscall : __NR_restart_syscall
727 #endif /* CONFIG_X86_32 */
730 * Note that 'init' is a special process: it doesn't get signals it doesn't
731 * want to handle. Thus you cannot kill init even with a SIGKILL even by
734 static void do_signal(struct pt_regs *regs)
736 struct k_sigaction ka;
740 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
742 /* Whee! Actually deliver the signal. */
743 handle_signal(signr, &info, &ka, regs);
747 /* Did we come from a system call? */
748 if (syscall_get_nr(current, regs) >= 0) {
749 /* Restart the system call - no handlers present */
750 switch (syscall_get_error(current, regs)) {
751 case -ERESTARTNOHAND:
753 case -ERESTARTNOINTR:
754 regs->ax = regs->orig_ax;
758 case -ERESTART_RESTARTBLOCK:
759 regs->ax = NR_restart_syscall;
766 * If there's no signal to deliver, we just put the saved sigmask
769 restore_saved_sigmask();
773 * notification of userspace execution resumption
774 * - triggered by the TIF_WORK_MASK flags
777 do_notify_resume(struct pt_regs *regs, void *unused, __u32 thread_info_flags)
779 #ifdef CONFIG_X86_MCE
780 /* notify userspace of pending MCEs */
781 if (thread_info_flags & _TIF_MCE_NOTIFY)
782 mce_notify_process();
783 #endif /* CONFIG_X86_64 && CONFIG_X86_MCE */
785 if (thread_info_flags & _TIF_UPROBE) {
786 clear_thread_flag(TIF_UPROBE);
787 uprobe_notify_resume(regs);
790 /* deal with pending signal delivery */
791 if (thread_info_flags & _TIF_SIGPENDING)
794 if (thread_info_flags & _TIF_NOTIFY_RESUME) {
795 clear_thread_flag(TIF_NOTIFY_RESUME);
796 tracehook_notify_resume(regs);
798 if (thread_info_flags & _TIF_USER_RETURN_NOTIFY)
799 fire_user_return_notifiers();
802 clear_thread_flag(TIF_IRET);
803 #endif /* CONFIG_X86_32 */
806 void signal_fault(struct pt_regs *regs, void __user *frame, char *where)
808 struct task_struct *me = current;
810 if (show_unhandled_signals && printk_ratelimit()) {
812 "%s[%d] bad frame in %s frame:%p ip:%lx sp:%lx orax:%lx",
813 task_pid_nr(current) > 1 ? KERN_INFO : KERN_EMERG,
814 me->comm, me->pid, where, frame,
815 regs->ip, regs->sp, regs->orig_ax);
816 print_vma_addr(" in ", regs->ip);
817 printk(KERN_CONT "\n");
820 force_sig(SIGSEGV, me);
823 #ifdef CONFIG_X86_X32_ABI
824 static int x32_setup_rt_frame(int sig, struct k_sigaction *ka,
825 siginfo_t *info, compat_sigset_t *set,
826 struct pt_regs *regs)
828 struct rt_sigframe_x32 __user *frame;
829 void __user *restorer;
831 void __user *fpstate = NULL;
833 frame = get_sigframe(ka, regs, sizeof(*frame), &fpstate);
835 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
838 if (ka->sa.sa_flags & SA_SIGINFO) {
839 if (copy_siginfo_to_user32(&frame->info, info))
844 /* Create the ucontext. */
846 put_user_ex(UC_FP_XSTATE, &frame->uc.uc_flags);
848 put_user_ex(0, &frame->uc.uc_flags);
849 put_user_ex(0, &frame->uc.uc_link);
850 put_user_ex(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
851 put_user_ex(sas_ss_flags(regs->sp),
852 &frame->uc.uc_stack.ss_flags);
853 put_user_ex(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
854 put_user_ex(0, &frame->uc.uc__pad0);
855 err |= setup_sigcontext(&frame->uc.uc_mcontext, fpstate,
857 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
859 if (ka->sa.sa_flags & SA_RESTORER) {
860 restorer = ka->sa.sa_restorer;
862 /* could use a vstub here */
866 put_user_ex(restorer, &frame->pretcode);
867 } put_user_catch(err);
872 /* Set up registers for signal handler */
873 regs->sp = (unsigned long) frame;
874 regs->ip = (unsigned long) ka->sa.sa_handler;
876 /* We use the x32 calling convention here... */
878 regs->si = (unsigned long) &frame->info;
879 regs->dx = (unsigned long) &frame->uc;
881 loadsegment(ds, __USER_DS);
882 loadsegment(es, __USER_DS);
884 regs->cs = __USER_CS;
885 regs->ss = __USER_DS;
890 asmlinkage long sys32_x32_rt_sigreturn(struct pt_regs *regs)
892 struct rt_sigframe_x32 __user *frame;
895 struct pt_regs tregs;
897 frame = (struct rt_sigframe_x32 __user *)(regs->sp - 8);
899 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
901 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
904 set_current_blocked(&set);
906 if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &ax))
910 if (sys32_sigaltstack(&frame->uc.uc_stack, NULL, &tregs) == -EFAULT)
916 signal_fault(regs, frame, "x32 rt_sigreturn");