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>
22 #include <asm/processor.h>
23 #include <asm/ucontext.h>
25 #include <asm/fpu-internal.h>
28 #include <asm/sighandling.h>
31 #include <asm/proto.h>
32 #include <asm/ia32_unistd.h>
33 #include <asm/sys_ia32.h>
34 #endif /* CONFIG_X86_64 */
36 #include <asm/syscall.h>
37 #include <asm/syscalls.h>
39 #include <asm/sigframe.h>
42 # define FIX_EFLAGS (__FIX_EFLAGS | X86_EFLAGS_RF)
44 # define FIX_EFLAGS __FIX_EFLAGS
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; \
65 int restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc,
69 unsigned int tmpflags;
72 /* Always make any pending restarted system calls return -EINTR */
73 current_thread_info()->restart_block.fn = do_no_restart_syscall;
78 set_user_gs(regs, GET_SEG(gs));
82 #endif /* CONFIG_X86_32 */
84 COPY(di); COPY(si); COPY(bp); COPY(sp); COPY(bx);
85 COPY(dx); COPY(cx); COPY(ip);
96 #endif /* CONFIG_X86_64 */
101 #else /* !CONFIG_X86_32 */
102 /* Kernel saves and restores only the CS segment register on signals,
103 * which is the bare minimum needed to allow mixed 32/64-bit code.
104 * App's signal handler can save/restore other segments if needed. */
106 #endif /* CONFIG_X86_32 */
108 get_user_ex(tmpflags, &sc->flags);
109 regs->flags = (regs->flags & ~FIX_EFLAGS) | (tmpflags & FIX_EFLAGS);
110 regs->orig_ax = -1; /* disable syscall checks */
112 get_user_ex(buf, &sc->fpstate);
113 err |= restore_i387_xstate(buf);
115 get_user_ex(*pax, &sc->ax);
116 } get_user_catch(err);
121 int setup_sigcontext(struct sigcontext __user *sc, void __user *fpstate,
122 struct pt_regs *regs, unsigned long mask)
129 put_user_ex(get_user_gs(regs), (unsigned int __user *)&sc->gs);
130 put_user_ex(regs->fs, (unsigned int __user *)&sc->fs);
131 put_user_ex(regs->es, (unsigned int __user *)&sc->es);
132 put_user_ex(regs->ds, (unsigned int __user *)&sc->ds);
133 #endif /* CONFIG_X86_32 */
135 put_user_ex(regs->di, &sc->di);
136 put_user_ex(regs->si, &sc->si);
137 put_user_ex(regs->bp, &sc->bp);
138 put_user_ex(regs->sp, &sc->sp);
139 put_user_ex(regs->bx, &sc->bx);
140 put_user_ex(regs->dx, &sc->dx);
141 put_user_ex(regs->cx, &sc->cx);
142 put_user_ex(regs->ax, &sc->ax);
144 put_user_ex(regs->r8, &sc->r8);
145 put_user_ex(regs->r9, &sc->r9);
146 put_user_ex(regs->r10, &sc->r10);
147 put_user_ex(regs->r11, &sc->r11);
148 put_user_ex(regs->r12, &sc->r12);
149 put_user_ex(regs->r13, &sc->r13);
150 put_user_ex(regs->r14, &sc->r14);
151 put_user_ex(regs->r15, &sc->r15);
152 #endif /* CONFIG_X86_64 */
154 put_user_ex(current->thread.trap_nr, &sc->trapno);
155 put_user_ex(current->thread.error_code, &sc->err);
156 put_user_ex(regs->ip, &sc->ip);
158 put_user_ex(regs->cs, (unsigned int __user *)&sc->cs);
159 put_user_ex(regs->flags, &sc->flags);
160 put_user_ex(regs->sp, &sc->sp_at_signal);
161 put_user_ex(regs->ss, (unsigned int __user *)&sc->ss);
162 #else /* !CONFIG_X86_32 */
163 put_user_ex(regs->flags, &sc->flags);
164 put_user_ex(regs->cs, &sc->cs);
165 put_user_ex(0, &sc->gs);
166 put_user_ex(0, &sc->fs);
167 #endif /* CONFIG_X86_32 */
169 put_user_ex(fpstate, &sc->fpstate);
171 /* non-iBCS2 extensions.. */
172 put_user_ex(mask, &sc->oldmask);
173 put_user_ex(current->thread.cr2, &sc->cr2);
174 } put_user_catch(err);
180 * Set up a signal frame.
184 * Determine which stack to use..
186 static unsigned long align_sigframe(unsigned long sp)
190 * Align the stack pointer according to the i386 ABI,
191 * i.e. so that on function entry ((sp + 4) & 15) == 0.
193 sp = ((sp + 4) & -16ul) - 4;
194 #else /* !CONFIG_X86_32 */
195 sp = round_down(sp, 16) - 8;
200 static inline void __user *
201 get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size,
202 void __user **fpstate)
204 /* Default to using normal stack */
205 unsigned long sp = regs->sp;
206 int onsigstack = on_sig_stack(sp);
211 #endif /* CONFIG_X86_64 */
214 /* This is the X/Open sanctioned signal stack switching. */
215 if (ka->sa.sa_flags & SA_ONSTACK) {
216 if (current->sas_ss_size)
217 sp = current->sas_ss_sp + current->sas_ss_size;
220 /* This is the legacy signal stack switching. */
221 if ((regs->ss & 0xffff) != __USER_DS &&
222 !(ka->sa.sa_flags & SA_RESTORER) &&
224 sp = (unsigned long) ka->sa.sa_restorer;
225 #endif /* CONFIG_X86_32 */
230 sp -= sig_xstate_size;
232 sp = round_down(sp, 64);
233 #endif /* CONFIG_X86_64 */
234 *fpstate = (void __user *)sp;
237 sp = align_sigframe(sp - frame_size);
240 * If we are on the alternate signal stack and would overflow it, don't.
241 * Return an always-bogus address instead so we will die with SIGSEGV.
243 if (onsigstack && !likely(on_sig_stack(sp)))
244 return (void __user *)-1L;
246 /* save i387 state */
247 if (used_math() && save_i387_xstate(*fpstate) < 0)
248 return (void __user *)-1L;
250 return (void __user *)sp;
254 static const struct {
258 } __attribute__((packed)) retcode = {
259 0xb858, /* popl %eax; movl $..., %eax */
261 0x80cd, /* int $0x80 */
264 static const struct {
269 } __attribute__((packed)) rt_retcode = {
270 0xb8, /* movl $..., %eax */
272 0x80cd, /* int $0x80 */
277 __setup_frame(int sig, struct k_sigaction *ka, sigset_t *set,
278 struct pt_regs *regs)
280 struct sigframe __user *frame;
281 void __user *restorer;
283 void __user *fpstate = NULL;
285 frame = get_sigframe(ka, regs, sizeof(*frame), &fpstate);
287 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
290 if (__put_user(sig, &frame->sig))
293 if (setup_sigcontext(&frame->sc, fpstate, regs, set->sig[0]))
296 if (_NSIG_WORDS > 1) {
297 if (__copy_to_user(&frame->extramask, &set->sig[1],
298 sizeof(frame->extramask)))
302 if (current->mm->context.vdso)
303 restorer = VDSO32_SYMBOL(current->mm->context.vdso, sigreturn);
305 restorer = &frame->retcode;
306 if (ka->sa.sa_flags & SA_RESTORER)
307 restorer = ka->sa.sa_restorer;
309 /* Set up to return from userspace. */
310 err |= __put_user(restorer, &frame->pretcode);
313 * This is popl %eax ; movl $__NR_sigreturn, %eax ; int $0x80
315 * WE DO NOT USE IT ANY MORE! It's only left here for historical
316 * reasons and because gdb uses it as a signature to notice
317 * signal handler stack frames.
319 err |= __put_user(*((u64 *)&retcode), (u64 *)frame->retcode);
324 /* Set up registers for signal handler */
325 regs->sp = (unsigned long)frame;
326 regs->ip = (unsigned long)ka->sa.sa_handler;
327 regs->ax = (unsigned long)sig;
331 regs->ds = __USER_DS;
332 regs->es = __USER_DS;
333 regs->ss = __USER_DS;
334 regs->cs = __USER_CS;
339 static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
340 sigset_t *set, struct pt_regs *regs)
342 struct rt_sigframe __user *frame;
343 void __user *restorer;
345 void __user *fpstate = NULL;
347 frame = get_sigframe(ka, regs, sizeof(*frame), &fpstate);
349 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
353 put_user_ex(sig, &frame->sig);
354 put_user_ex(&frame->info, &frame->pinfo);
355 put_user_ex(&frame->uc, &frame->puc);
356 err |= copy_siginfo_to_user(&frame->info, info);
358 /* Create the ucontext. */
360 put_user_ex(UC_FP_XSTATE, &frame->uc.uc_flags);
362 put_user_ex(0, &frame->uc.uc_flags);
363 put_user_ex(0, &frame->uc.uc_link);
364 put_user_ex(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
365 put_user_ex(sas_ss_flags(regs->sp),
366 &frame->uc.uc_stack.ss_flags);
367 put_user_ex(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
368 err |= setup_sigcontext(&frame->uc.uc_mcontext, fpstate,
370 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
372 /* Set up to return from userspace. */
373 restorer = VDSO32_SYMBOL(current->mm->context.vdso, rt_sigreturn);
374 if (ka->sa.sa_flags & SA_RESTORER)
375 restorer = ka->sa.sa_restorer;
376 put_user_ex(restorer, &frame->pretcode);
379 * This is movl $__NR_rt_sigreturn, %ax ; int $0x80
381 * WE DO NOT USE IT ANY MORE! It's only left here for historical
382 * reasons and because gdb uses it as a signature to notice
383 * signal handler stack frames.
385 put_user_ex(*((u64 *)&rt_retcode), (u64 *)frame->retcode);
386 } put_user_catch(err);
391 /* Set up registers for signal handler */
392 regs->sp = (unsigned long)frame;
393 regs->ip = (unsigned long)ka->sa.sa_handler;
394 regs->ax = (unsigned long)sig;
395 regs->dx = (unsigned long)&frame->info;
396 regs->cx = (unsigned long)&frame->uc;
398 regs->ds = __USER_DS;
399 regs->es = __USER_DS;
400 regs->ss = __USER_DS;
401 regs->cs = __USER_CS;
405 #else /* !CONFIG_X86_32 */
406 static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
407 sigset_t *set, struct pt_regs *regs)
409 struct rt_sigframe __user *frame;
410 void __user *fp = NULL;
412 struct task_struct *me = current;
414 frame = get_sigframe(ka, regs, sizeof(struct rt_sigframe), &fp);
416 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
419 if (ka->sa.sa_flags & SA_SIGINFO) {
420 if (copy_siginfo_to_user(&frame->info, info))
425 /* Create the ucontext. */
427 put_user_ex(UC_FP_XSTATE, &frame->uc.uc_flags);
429 put_user_ex(0, &frame->uc.uc_flags);
430 put_user_ex(0, &frame->uc.uc_link);
431 put_user_ex(me->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
432 put_user_ex(sas_ss_flags(regs->sp),
433 &frame->uc.uc_stack.ss_flags);
434 put_user_ex(me->sas_ss_size, &frame->uc.uc_stack.ss_size);
435 err |= setup_sigcontext(&frame->uc.uc_mcontext, fp, regs, set->sig[0]);
436 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
438 /* Set up to return from userspace. If provided, use a stub
439 already in userspace. */
440 /* x86-64 should always use SA_RESTORER. */
441 if (ka->sa.sa_flags & SA_RESTORER) {
442 put_user_ex(ka->sa.sa_restorer, &frame->pretcode);
444 /* could use a vstub here */
447 } put_user_catch(err);
452 /* Set up registers for signal handler */
454 /* In case the signal handler was declared without prototypes */
457 /* This also works for non SA_SIGINFO handlers because they expect the
458 next argument after the signal number on the stack. */
459 regs->si = (unsigned long)&frame->info;
460 regs->dx = (unsigned long)&frame->uc;
461 regs->ip = (unsigned long) ka->sa.sa_handler;
463 regs->sp = (unsigned long)frame;
465 /* Set up the CS register to run signal handlers in 64-bit mode,
466 even if the handler happens to be interrupting 32-bit code. */
467 regs->cs = __USER_CS;
471 #endif /* CONFIG_X86_32 */
475 * Atomically swap in the new signal mask, and wait for a signal.
478 sys_sigsuspend(int history0, int history1, old_sigset_t mask)
481 siginitset(&blocked, mask);
482 return sigsuspend(&blocked);
486 sys_sigaction(int sig, const struct old_sigaction __user *act,
487 struct old_sigaction __user *oact)
489 struct k_sigaction new_ka, old_ka;
495 if (!access_ok(VERIFY_READ, act, sizeof(*act)))
499 get_user_ex(new_ka.sa.sa_handler, &act->sa_handler);
500 get_user_ex(new_ka.sa.sa_flags, &act->sa_flags);
501 get_user_ex(mask, &act->sa_mask);
502 get_user_ex(new_ka.sa.sa_restorer, &act->sa_restorer);
503 } get_user_catch(ret);
507 siginitset(&new_ka.sa.sa_mask, mask);
510 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
513 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)))
517 put_user_ex(old_ka.sa.sa_handler, &oact->sa_handler);
518 put_user_ex(old_ka.sa.sa_flags, &oact->sa_flags);
519 put_user_ex(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
520 put_user_ex(old_ka.sa.sa_restorer, &oact->sa_restorer);
521 } put_user_catch(ret);
529 #endif /* CONFIG_X86_32 */
532 sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
533 struct pt_regs *regs)
535 return do_sigaltstack(uss, uoss, regs->sp);
539 * Do a signal return; undo the signal stack.
542 unsigned long sys_sigreturn(struct pt_regs *regs)
544 struct sigframe __user *frame;
548 frame = (struct sigframe __user *)(regs->sp - 8);
550 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
552 if (__get_user(set.sig[0], &frame->sc.oldmask) || (_NSIG_WORDS > 1
553 && __copy_from_user(&set.sig[1], &frame->extramask,
554 sizeof(frame->extramask))))
557 sigdelsetmask(&set, ~_BLOCKABLE);
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 sigdelsetmask(&set, ~_BLOCKABLE);
584 set_current_blocked(&set);
586 if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &ax))
589 if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->sp) == -EFAULT)
595 signal_fault(regs, frame, "rt_sigreturn");
600 * OK, we're invoking a handler:
602 static int signr_convert(int sig)
605 struct thread_info *info = current_thread_info();
607 if (info->exec_domain && info->exec_domain->signal_invmap && sig < 32)
608 return info->exec_domain->signal_invmap[sig];
609 #endif /* CONFIG_X86_32 */
616 #define ia32_setup_frame __setup_frame
617 #define ia32_setup_rt_frame __setup_rt_frame
619 #else /* !CONFIG_X86_32 */
621 #ifdef CONFIG_IA32_EMULATION
622 #define is_ia32 test_thread_flag(TIF_IA32)
623 #else /* !CONFIG_IA32_EMULATION */
625 #endif /* CONFIG_IA32_EMULATION */
627 #ifdef CONFIG_X86_X32_ABI
628 #define is_x32 test_thread_flag(TIF_X32)
630 static int x32_setup_rt_frame(int sig, struct k_sigaction *ka,
631 siginfo_t *info, compat_sigset_t *set,
632 struct pt_regs *regs);
633 #else /* !CONFIG_X86_X32_ABI */
635 #endif /* CONFIG_X86_X32_ABI */
637 int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
638 sigset_t *set, struct pt_regs *regs);
639 int ia32_setup_frame(int sig, struct k_sigaction *ka,
640 sigset_t *set, struct pt_regs *regs);
642 #endif /* CONFIG_X86_32 */
645 setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
646 struct pt_regs *regs)
648 int usig = signr_convert(sig);
649 sigset_t *set = ¤t->blocked;
652 if (current_thread_info()->status & TS_RESTORE_SIGMASK)
653 set = ¤t->saved_sigmask;
655 /* Set up the stack frame */
657 if (ka->sa.sa_flags & SA_SIGINFO)
658 ret = ia32_setup_rt_frame(usig, ka, info, set, regs);
660 ret = ia32_setup_frame(usig, ka, set, regs);
661 #ifdef CONFIG_X86_X32_ABI
663 ret = x32_setup_rt_frame(usig, ka, info,
664 (compat_sigset_t *)set, regs);
667 ret = __setup_rt_frame(sig, ka, info, set, regs);
671 force_sigsegv(sig, current);
675 current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
680 handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
681 struct pt_regs *regs)
685 /* Are we from a system call? */
686 if (syscall_get_nr(current, regs) >= 0) {
687 /* If so, check system call restarting.. */
688 switch (syscall_get_error(current, regs)) {
689 case -ERESTART_RESTARTBLOCK:
690 case -ERESTARTNOHAND:
695 if (!(ka->sa.sa_flags & SA_RESTART)) {
700 case -ERESTARTNOINTR:
701 regs->ax = regs->orig_ax;
708 * If TF is set due to a debugger (TIF_FORCED_TF), clear the TF
709 * flag so that register information in the sigcontext is correct.
711 if (unlikely(regs->flags & X86_EFLAGS_TF) &&
712 likely(test_and_clear_thread_flag(TIF_FORCED_TF)))
713 regs->flags &= ~X86_EFLAGS_TF;
715 ret = setup_rt_frame(sig, ka, info, regs);
721 * Clear the direction flag as per the ABI for function entry.
723 regs->flags &= ~X86_EFLAGS_DF;
726 * Clear TF when entering the signal handler, but
727 * notify any tracer that was single-stepping it.
728 * The tracer may want to single-step inside the
731 regs->flags &= ~X86_EFLAGS_TF;
733 block_sigmask(ka, sig);
735 tracehook_signal_handler(sig, info, ka, regs,
736 test_thread_flag(TIF_SINGLESTEP));
742 #define NR_restart_syscall __NR_restart_syscall
743 #else /* !CONFIG_X86_32 */
744 #define NR_restart_syscall \
745 test_thread_flag(TIF_IA32) ? __NR_ia32_restart_syscall : __NR_restart_syscall
746 #endif /* CONFIG_X86_32 */
749 * Note that 'init' is a special process: it doesn't get signals it doesn't
750 * want to handle. Thus you cannot kill init even with a SIGKILL even by
753 static void do_signal(struct pt_regs *regs)
755 struct k_sigaction ka;
760 * We want the common case to go fast, which is why we may in certain
761 * cases get here from kernel mode. Just return without doing anything
763 * X86_32: vm86 regs switched out by assembly code before reaching
764 * here, so testing against kernel CS suffices.
766 if (!user_mode(regs))
769 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
771 /* Whee! Actually deliver the signal. */
772 handle_signal(signr, &info, &ka, regs);
776 /* Did we come from a system call? */
777 if (syscall_get_nr(current, regs) >= 0) {
778 /* Restart the system call - no handlers present */
779 switch (syscall_get_error(current, regs)) {
780 case -ERESTARTNOHAND:
782 case -ERESTARTNOINTR:
783 regs->ax = regs->orig_ax;
787 case -ERESTART_RESTARTBLOCK:
788 regs->ax = NR_restart_syscall;
795 * If there's no signal to deliver, we just put the saved sigmask
798 if (current_thread_info()->status & TS_RESTORE_SIGMASK) {
799 current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
800 set_current_blocked(¤t->saved_sigmask);
805 * notification of userspace execution resumption
806 * - triggered by the TIF_WORK_MASK flags
809 do_notify_resume(struct pt_regs *regs, void *unused, __u32 thread_info_flags)
811 #ifdef CONFIG_X86_MCE
812 /* notify userspace of pending MCEs */
813 if (thread_info_flags & _TIF_MCE_NOTIFY)
814 mce_notify_process();
815 #endif /* CONFIG_X86_64 && CONFIG_X86_MCE */
817 /* deal with pending signal delivery */
818 if (thread_info_flags & _TIF_SIGPENDING)
821 if (thread_info_flags & _TIF_NOTIFY_RESUME) {
822 clear_thread_flag(TIF_NOTIFY_RESUME);
823 tracehook_notify_resume(regs);
824 if (current->replacement_session_keyring)
825 key_replace_session_keyring();
827 if (thread_info_flags & _TIF_USER_RETURN_NOTIFY)
828 fire_user_return_notifiers();
831 clear_thread_flag(TIF_IRET);
832 #endif /* CONFIG_X86_32 */
835 void signal_fault(struct pt_regs *regs, void __user *frame, char *where)
837 struct task_struct *me = current;
839 if (show_unhandled_signals && printk_ratelimit()) {
841 "%s[%d] bad frame in %s frame:%p ip:%lx sp:%lx orax:%lx",
842 task_pid_nr(current) > 1 ? KERN_INFO : KERN_EMERG,
843 me->comm, me->pid, where, frame,
844 regs->ip, regs->sp, regs->orig_ax);
845 print_vma_addr(" in ", regs->ip);
846 printk(KERN_CONT "\n");
849 force_sig(SIGSEGV, me);
852 #ifdef CONFIG_X86_X32_ABI
853 static int x32_setup_rt_frame(int sig, struct k_sigaction *ka,
854 siginfo_t *info, compat_sigset_t *set,
855 struct pt_regs *regs)
857 struct rt_sigframe_x32 __user *frame;
858 void __user *restorer;
860 void __user *fpstate = NULL;
862 frame = get_sigframe(ka, regs, sizeof(*frame), &fpstate);
864 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
867 if (ka->sa.sa_flags & SA_SIGINFO) {
868 if (copy_siginfo_to_user32(&frame->info, info))
873 /* Create the ucontext. */
875 put_user_ex(UC_FP_XSTATE, &frame->uc.uc_flags);
877 put_user_ex(0, &frame->uc.uc_flags);
878 put_user_ex(0, &frame->uc.uc_link);
879 put_user_ex(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
880 put_user_ex(sas_ss_flags(regs->sp),
881 &frame->uc.uc_stack.ss_flags);
882 put_user_ex(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
883 put_user_ex(0, &frame->uc.uc__pad0);
884 err |= setup_sigcontext(&frame->uc.uc_mcontext, fpstate,
886 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
888 if (ka->sa.sa_flags & SA_RESTORER) {
889 restorer = ka->sa.sa_restorer;
891 /* could use a vstub here */
895 put_user_ex(restorer, &frame->pretcode);
896 } put_user_catch(err);
901 /* Set up registers for signal handler */
902 regs->sp = (unsigned long) frame;
903 regs->ip = (unsigned long) ka->sa.sa_handler;
905 /* We use the x32 calling convention here... */
907 regs->si = (unsigned long) &frame->info;
908 regs->dx = (unsigned long) &frame->uc;
910 loadsegment(ds, __USER_DS);
911 loadsegment(es, __USER_DS);
913 regs->cs = __USER_CS;
914 regs->ss = __USER_DS;
919 asmlinkage long sys32_x32_rt_sigreturn(struct pt_regs *regs)
921 struct rt_sigframe_x32 __user *frame;
924 struct pt_regs tregs;
926 frame = (struct rt_sigframe_x32 __user *)(regs->sp - 8);
928 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
930 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
933 sigdelsetmask(&set, ~_BLOCKABLE);
934 set_current_blocked(&set);
936 if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &ax))
940 if (sys32_sigaltstack(&frame->uc.uc_stack, NULL, &tregs) == -EFAULT)
946 signal_fault(regs, frame, "x32 rt_sigreturn");