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/signal.h>
14 #include <linux/errno.h>
15 #include <linux/wait.h>
16 #include <linux/ptrace.h>
17 #include <linux/tracehook.h>
18 #include <linux/unistd.h>
19 #include <linux/stddef.h>
20 #include <linux/personality.h>
21 #include <linux/uaccess.h>
23 #include <asm/processor.h>
24 #include <asm/ucontext.h>
29 #include <asm/proto.h>
30 #include <asm/ia32_unistd.h>
32 #endif /* CONFIG_X86_64 */
34 #include <asm/syscall.h>
35 #include <asm/syscalls.h>
37 #include <asm/sigframe.h>
39 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
41 #define __FIX_EFLAGS (X86_EFLAGS_AC | X86_EFLAGS_OF | \
42 X86_EFLAGS_DF | X86_EFLAGS_TF | X86_EFLAGS_SF | \
43 X86_EFLAGS_ZF | X86_EFLAGS_AF | X86_EFLAGS_PF | \
47 # define FIX_EFLAGS (__FIX_EFLAGS | X86_EFLAGS_RF)
49 # define FIX_EFLAGS __FIX_EFLAGS
52 #define COPY(x) do { \
53 get_user_ex(regs->x, &sc->x); \
56 #define GET_SEG(seg) ({ \
58 get_user_ex(tmp, &sc->seg); \
62 #define COPY_SEG(seg) do { \
63 regs->seg = GET_SEG(seg); \
66 #define COPY_SEG_CPL3(seg) do { \
67 regs->seg = GET_SEG(seg) | 3; \
71 restore_sigcontext(struct pt_regs
*regs
, struct sigcontext __user
*sc
,
75 unsigned int tmpflags
;
78 /* Always make any pending restarted system calls return -EINTR */
79 current_thread_info()->restart_block
.fn
= do_no_restart_syscall
;
84 set_user_gs(regs
, GET_SEG(gs
));
88 #endif /* CONFIG_X86_32 */
90 COPY(di
); COPY(si
); COPY(bp
); COPY(sp
); COPY(bx
);
91 COPY(dx
); COPY(cx
); COPY(ip
);
102 #endif /* CONFIG_X86_64 */
107 #else /* !CONFIG_X86_32 */
108 /* Kernel saves and restores only the CS segment register on signals,
109 * which is the bare minimum needed to allow mixed 32/64-bit code.
110 * App's signal handler can save/restore other segments if needed. */
112 #endif /* CONFIG_X86_32 */
114 get_user_ex(tmpflags
, &sc
->flags
);
115 regs
->flags
= (regs
->flags
& ~FIX_EFLAGS
) | (tmpflags
& FIX_EFLAGS
);
116 regs
->orig_ax
= -1; /* disable syscall checks */
118 get_user_ex(buf
, &sc
->fpstate
);
119 err
|= restore_i387_xstate(buf
);
121 get_user_ex(*pax
, &sc
->ax
);
122 } get_user_catch(err
);
128 setup_sigcontext(struct sigcontext __user
*sc
, void __user
*fpstate
,
129 struct pt_regs
*regs
, unsigned long mask
)
136 put_user_ex(get_user_gs(regs
), (unsigned int __user
*)&sc
->gs
);
137 put_user_ex(regs
->fs
, (unsigned int __user
*)&sc
->fs
);
138 put_user_ex(regs
->es
, (unsigned int __user
*)&sc
->es
);
139 put_user_ex(regs
->ds
, (unsigned int __user
*)&sc
->ds
);
140 #endif /* CONFIG_X86_32 */
142 put_user_ex(regs
->di
, &sc
->di
);
143 put_user_ex(regs
->si
, &sc
->si
);
144 put_user_ex(regs
->bp
, &sc
->bp
);
145 put_user_ex(regs
->sp
, &sc
->sp
);
146 put_user_ex(regs
->bx
, &sc
->bx
);
147 put_user_ex(regs
->dx
, &sc
->dx
);
148 put_user_ex(regs
->cx
, &sc
->cx
);
149 put_user_ex(regs
->ax
, &sc
->ax
);
151 put_user_ex(regs
->r8
, &sc
->r8
);
152 put_user_ex(regs
->r9
, &sc
->r9
);
153 put_user_ex(regs
->r10
, &sc
->r10
);
154 put_user_ex(regs
->r11
, &sc
->r11
);
155 put_user_ex(regs
->r12
, &sc
->r12
);
156 put_user_ex(regs
->r13
, &sc
->r13
);
157 put_user_ex(regs
->r14
, &sc
->r14
);
158 put_user_ex(regs
->r15
, &sc
->r15
);
159 #endif /* CONFIG_X86_64 */
161 put_user_ex(current
->thread
.trap_no
, &sc
->trapno
);
162 put_user_ex(current
->thread
.error_code
, &sc
->err
);
163 put_user_ex(regs
->ip
, &sc
->ip
);
165 put_user_ex(regs
->cs
, (unsigned int __user
*)&sc
->cs
);
166 put_user_ex(regs
->flags
, &sc
->flags
);
167 put_user_ex(regs
->sp
, &sc
->sp_at_signal
);
168 put_user_ex(regs
->ss
, (unsigned int __user
*)&sc
->ss
);
169 #else /* !CONFIG_X86_32 */
170 put_user_ex(regs
->flags
, &sc
->flags
);
171 put_user_ex(regs
->cs
, &sc
->cs
);
172 put_user_ex(0, &sc
->gs
);
173 put_user_ex(0, &sc
->fs
);
174 #endif /* CONFIG_X86_32 */
176 put_user_ex(fpstate
, &sc
->fpstate
);
178 /* non-iBCS2 extensions.. */
179 put_user_ex(mask
, &sc
->oldmask
);
180 put_user_ex(current
->thread
.cr2
, &sc
->cr2
);
181 } put_user_catch(err
);
187 * Set up a signal frame.
191 * Determine which stack to use..
193 static unsigned long align_sigframe(unsigned long sp
)
197 * Align the stack pointer according to the i386 ABI,
198 * i.e. so that on function entry ((sp + 4) & 15) == 0.
200 sp
= ((sp
+ 4) & -16ul) - 4;
201 #else /* !CONFIG_X86_32 */
202 sp
= round_down(sp
, 16) - 8;
207 static inline void __user
*
208 get_sigframe(struct k_sigaction
*ka
, struct pt_regs
*regs
, size_t frame_size
,
209 void __user
**fpstate
)
211 /* Default to using normal stack */
212 unsigned long sp
= regs
->sp
;
213 int onsigstack
= on_sig_stack(sp
);
218 #endif /* CONFIG_X86_64 */
221 /* This is the X/Open sanctioned signal stack switching. */
222 if (ka
->sa
.sa_flags
& SA_ONSTACK
) {
223 if (current
->sas_ss_size
)
224 sp
= current
->sas_ss_sp
+ current
->sas_ss_size
;
227 /* This is the legacy signal stack switching. */
228 if ((regs
->ss
& 0xffff) != __USER_DS
&&
229 !(ka
->sa
.sa_flags
& SA_RESTORER
) &&
231 sp
= (unsigned long) ka
->sa
.sa_restorer
;
232 #endif /* CONFIG_X86_32 */
237 sp
-= sig_xstate_size
;
239 sp
= round_down(sp
, 64);
240 #endif /* CONFIG_X86_64 */
241 *fpstate
= (void __user
*)sp
;
244 sp
= align_sigframe(sp
- frame_size
);
247 * If we are on the alternate signal stack and would overflow it, don't.
248 * Return an always-bogus address instead so we will die with SIGSEGV.
250 if (onsigstack
&& !likely(on_sig_stack(sp
)))
251 return (void __user
*)-1L;
253 /* save i387 state */
254 if (used_math() && save_i387_xstate(*fpstate
) < 0)
255 return (void __user
*)-1L;
257 return (void __user
*)sp
;
261 static const struct {
265 } __attribute__((packed
)) retcode
= {
266 0xb858, /* popl %eax; movl $..., %eax */
268 0x80cd, /* int $0x80 */
271 static const struct {
276 } __attribute__((packed
)) rt_retcode
= {
277 0xb8, /* movl $..., %eax */
279 0x80cd, /* int $0x80 */
284 __setup_frame(int sig
, struct k_sigaction
*ka
, sigset_t
*set
,
285 struct pt_regs
*regs
)
287 struct sigframe __user
*frame
;
288 void __user
*restorer
;
290 void __user
*fpstate
= NULL
;
292 frame
= get_sigframe(ka
, regs
, sizeof(*frame
), &fpstate
);
294 if (!access_ok(VERIFY_WRITE
, frame
, sizeof(*frame
)))
297 if (__put_user(sig
, &frame
->sig
))
300 if (setup_sigcontext(&frame
->sc
, fpstate
, regs
, set
->sig
[0]))
303 if (_NSIG_WORDS
> 1) {
304 if (__copy_to_user(&frame
->extramask
, &set
->sig
[1],
305 sizeof(frame
->extramask
)))
309 if (current
->mm
->context
.vdso
)
310 restorer
= VDSO32_SYMBOL(current
->mm
->context
.vdso
, sigreturn
);
312 restorer
= &frame
->retcode
;
313 if (ka
->sa
.sa_flags
& SA_RESTORER
)
314 restorer
= ka
->sa
.sa_restorer
;
316 /* Set up to return from userspace. */
317 err
|= __put_user(restorer
, &frame
->pretcode
);
320 * This is popl %eax ; movl $__NR_sigreturn, %eax ; int $0x80
322 * WE DO NOT USE IT ANY MORE! It's only left here for historical
323 * reasons and because gdb uses it as a signature to notice
324 * signal handler stack frames.
326 err
|= __put_user(*((u64
*)&retcode
), (u64
*)frame
->retcode
);
331 /* Set up registers for signal handler */
332 regs
->sp
= (unsigned long)frame
;
333 regs
->ip
= (unsigned long)ka
->sa
.sa_handler
;
334 regs
->ax
= (unsigned long)sig
;
338 regs
->ds
= __USER_DS
;
339 regs
->es
= __USER_DS
;
340 regs
->ss
= __USER_DS
;
341 regs
->cs
= __USER_CS
;
346 static int __setup_rt_frame(int sig
, struct k_sigaction
*ka
, siginfo_t
*info
,
347 sigset_t
*set
, struct pt_regs
*regs
)
349 struct rt_sigframe __user
*frame
;
350 void __user
*restorer
;
352 void __user
*fpstate
= NULL
;
354 frame
= get_sigframe(ka
, regs
, sizeof(*frame
), &fpstate
);
356 if (!access_ok(VERIFY_WRITE
, frame
, sizeof(*frame
)))
360 put_user_ex(sig
, &frame
->sig
);
361 put_user_ex(&frame
->info
, &frame
->pinfo
);
362 put_user_ex(&frame
->uc
, &frame
->puc
);
363 err
|= copy_siginfo_to_user(&frame
->info
, info
);
365 /* Create the ucontext. */
367 put_user_ex(UC_FP_XSTATE
, &frame
->uc
.uc_flags
);
369 put_user_ex(0, &frame
->uc
.uc_flags
);
370 put_user_ex(0, &frame
->uc
.uc_link
);
371 put_user_ex(current
->sas_ss_sp
, &frame
->uc
.uc_stack
.ss_sp
);
372 put_user_ex(sas_ss_flags(regs
->sp
),
373 &frame
->uc
.uc_stack
.ss_flags
);
374 put_user_ex(current
->sas_ss_size
, &frame
->uc
.uc_stack
.ss_size
);
375 err
|= setup_sigcontext(&frame
->uc
.uc_mcontext
, fpstate
,
377 err
|= __copy_to_user(&frame
->uc
.uc_sigmask
, set
, sizeof(*set
));
379 /* Set up to return from userspace. */
380 restorer
= VDSO32_SYMBOL(current
->mm
->context
.vdso
, rt_sigreturn
);
381 if (ka
->sa
.sa_flags
& SA_RESTORER
)
382 restorer
= ka
->sa
.sa_restorer
;
383 put_user_ex(restorer
, &frame
->pretcode
);
386 * This is movl $__NR_rt_sigreturn, %ax ; int $0x80
388 * WE DO NOT USE IT ANY MORE! It's only left here for historical
389 * reasons and because gdb uses it as a signature to notice
390 * signal handler stack frames.
392 put_user_ex(*((u64
*)&rt_retcode
), (u64
*)frame
->retcode
);
393 } put_user_catch(err
);
398 /* Set up registers for signal handler */
399 regs
->sp
= (unsigned long)frame
;
400 regs
->ip
= (unsigned long)ka
->sa
.sa_handler
;
401 regs
->ax
= (unsigned long)sig
;
402 regs
->dx
= (unsigned long)&frame
->info
;
403 regs
->cx
= (unsigned long)&frame
->uc
;
405 regs
->ds
= __USER_DS
;
406 regs
->es
= __USER_DS
;
407 regs
->ss
= __USER_DS
;
408 regs
->cs
= __USER_CS
;
412 #else /* !CONFIG_X86_32 */
413 static int __setup_rt_frame(int sig
, struct k_sigaction
*ka
, siginfo_t
*info
,
414 sigset_t
*set
, struct pt_regs
*regs
)
416 struct rt_sigframe __user
*frame
;
417 void __user
*fp
= NULL
;
419 struct task_struct
*me
= current
;
421 frame
= get_sigframe(ka
, regs
, sizeof(struct rt_sigframe
), &fp
);
423 if (!access_ok(VERIFY_WRITE
, frame
, sizeof(*frame
)))
426 if (ka
->sa
.sa_flags
& SA_SIGINFO
) {
427 if (copy_siginfo_to_user(&frame
->info
, info
))
432 /* Create the ucontext. */
434 put_user_ex(UC_FP_XSTATE
, &frame
->uc
.uc_flags
);
436 put_user_ex(0, &frame
->uc
.uc_flags
);
437 put_user_ex(0, &frame
->uc
.uc_link
);
438 put_user_ex(me
->sas_ss_sp
, &frame
->uc
.uc_stack
.ss_sp
);
439 put_user_ex(sas_ss_flags(regs
->sp
),
440 &frame
->uc
.uc_stack
.ss_flags
);
441 put_user_ex(me
->sas_ss_size
, &frame
->uc
.uc_stack
.ss_size
);
442 err
|= setup_sigcontext(&frame
->uc
.uc_mcontext
, fp
, regs
, set
->sig
[0]);
443 err
|= __copy_to_user(&frame
->uc
.uc_sigmask
, set
, sizeof(*set
));
445 /* Set up to return from userspace. If provided, use a stub
446 already in userspace. */
447 /* x86-64 should always use SA_RESTORER. */
448 if (ka
->sa
.sa_flags
& SA_RESTORER
) {
449 put_user_ex(ka
->sa
.sa_restorer
, &frame
->pretcode
);
451 /* could use a vstub here */
454 } put_user_catch(err
);
459 /* Set up registers for signal handler */
461 /* In case the signal handler was declared without prototypes */
464 /* This also works for non SA_SIGINFO handlers because they expect the
465 next argument after the signal number on the stack. */
466 regs
->si
= (unsigned long)&frame
->info
;
467 regs
->dx
= (unsigned long)&frame
->uc
;
468 regs
->ip
= (unsigned long) ka
->sa
.sa_handler
;
470 regs
->sp
= (unsigned long)frame
;
472 /* Set up the CS register to run signal handlers in 64-bit mode,
473 even if the handler happens to be interrupting 32-bit code. */
474 regs
->cs
= __USER_CS
;
478 #endif /* CONFIG_X86_32 */
482 * Atomically swap in the new signal mask, and wait for a signal.
485 sys_sigsuspend(int history0
, int history1
, old_sigset_t mask
)
488 spin_lock_irq(¤t
->sighand
->siglock
);
489 current
->saved_sigmask
= current
->blocked
;
490 siginitset(¤t
->blocked
, mask
);
492 spin_unlock_irq(¤t
->sighand
->siglock
);
494 current
->state
= TASK_INTERRUPTIBLE
;
496 set_restore_sigmask();
498 return -ERESTARTNOHAND
;
502 sys_sigaction(int sig
, const struct old_sigaction __user
*act
,
503 struct old_sigaction __user
*oact
)
505 struct k_sigaction new_ka
, old_ka
;
511 if (!access_ok(VERIFY_READ
, act
, sizeof(*act
)))
515 get_user_ex(new_ka
.sa
.sa_handler
, &act
->sa_handler
);
516 get_user_ex(new_ka
.sa
.sa_flags
, &act
->sa_flags
);
517 get_user_ex(mask
, &act
->sa_mask
);
518 get_user_ex(new_ka
.sa
.sa_restorer
, &act
->sa_restorer
);
519 } get_user_catch(ret
);
523 siginitset(&new_ka
.sa
.sa_mask
, mask
);
526 ret
= do_sigaction(sig
, act
? &new_ka
: NULL
, oact
? &old_ka
: NULL
);
529 if (!access_ok(VERIFY_WRITE
, oact
, sizeof(*oact
)))
533 put_user_ex(old_ka
.sa
.sa_handler
, &oact
->sa_handler
);
534 put_user_ex(old_ka
.sa
.sa_flags
, &oact
->sa_flags
);
535 put_user_ex(old_ka
.sa
.sa_mask
.sig
[0], &oact
->sa_mask
);
536 put_user_ex(old_ka
.sa
.sa_restorer
, &oact
->sa_restorer
);
537 } put_user_catch(ret
);
545 #endif /* CONFIG_X86_32 */
548 int sys_sigaltstack(struct pt_regs
*regs
)
550 const stack_t __user
*uss
= (const stack_t __user
*)regs
->bx
;
551 stack_t __user
*uoss
= (stack_t __user
*)regs
->cx
;
553 return do_sigaltstack(uss
, uoss
, regs
->sp
);
555 #else /* !CONFIG_X86_32 */
557 sys_sigaltstack(const stack_t __user
*uss
, stack_t __user
*uoss
,
558 struct pt_regs
*regs
)
560 return do_sigaltstack(uss
, uoss
, regs
->sp
);
562 #endif /* CONFIG_X86_32 */
565 * Do a signal return; undo the signal stack.
568 unsigned long sys_sigreturn(struct pt_regs
*regs
)
570 struct sigframe __user
*frame
;
574 frame
= (struct sigframe __user
*)(regs
->sp
- 8);
576 if (!access_ok(VERIFY_READ
, frame
, sizeof(*frame
)))
578 if (__get_user(set
.sig
[0], &frame
->sc
.oldmask
) || (_NSIG_WORDS
> 1
579 && __copy_from_user(&set
.sig
[1], &frame
->extramask
,
580 sizeof(frame
->extramask
))))
583 sigdelsetmask(&set
, ~_BLOCKABLE
);
584 spin_lock_irq(¤t
->sighand
->siglock
);
585 current
->blocked
= set
;
587 spin_unlock_irq(¤t
->sighand
->siglock
);
589 if (restore_sigcontext(regs
, &frame
->sc
, &ax
))
594 signal_fault(regs
, frame
, "sigreturn");
598 #endif /* CONFIG_X86_32 */
600 long sys_rt_sigreturn(struct pt_regs
*regs
)
602 struct rt_sigframe __user
*frame
;
606 frame
= (struct rt_sigframe __user
*)(regs
->sp
- sizeof(long));
607 if (!access_ok(VERIFY_READ
, frame
, sizeof(*frame
)))
609 if (__copy_from_user(&set
, &frame
->uc
.uc_sigmask
, sizeof(set
)))
612 sigdelsetmask(&set
, ~_BLOCKABLE
);
613 spin_lock_irq(¤t
->sighand
->siglock
);
614 current
->blocked
= set
;
616 spin_unlock_irq(¤t
->sighand
->siglock
);
618 if (restore_sigcontext(regs
, &frame
->uc
.uc_mcontext
, &ax
))
621 if (do_sigaltstack(&frame
->uc
.uc_stack
, NULL
, regs
->sp
) == -EFAULT
)
627 signal_fault(regs
, frame
, "rt_sigreturn");
632 * OK, we're invoking a handler:
634 static int signr_convert(int sig
)
637 struct thread_info
*info
= current_thread_info();
639 if (info
->exec_domain
&& info
->exec_domain
->signal_invmap
&& sig
< 32)
640 return info
->exec_domain
->signal_invmap
[sig
];
641 #endif /* CONFIG_X86_32 */
648 #define ia32_setup_frame __setup_frame
649 #define ia32_setup_rt_frame __setup_rt_frame
651 #else /* !CONFIG_X86_32 */
653 #ifdef CONFIG_IA32_EMULATION
654 #define is_ia32 test_thread_flag(TIF_IA32)
655 #else /* !CONFIG_IA32_EMULATION */
657 #endif /* CONFIG_IA32_EMULATION */
659 int ia32_setup_rt_frame(int sig
, struct k_sigaction
*ka
, siginfo_t
*info
,
660 sigset_t
*set
, struct pt_regs
*regs
);
661 int ia32_setup_frame(int sig
, struct k_sigaction
*ka
,
662 sigset_t
*set
, struct pt_regs
*regs
);
664 #endif /* CONFIG_X86_32 */
667 setup_rt_frame(int sig
, struct k_sigaction
*ka
, siginfo_t
*info
,
668 sigset_t
*set
, struct pt_regs
*regs
)
670 int usig
= signr_convert(sig
);
673 /* Set up the stack frame */
675 if (ka
->sa
.sa_flags
& SA_SIGINFO
)
676 ret
= ia32_setup_rt_frame(usig
, ka
, info
, set
, regs
);
678 ret
= ia32_setup_frame(usig
, ka
, set
, regs
);
680 ret
= __setup_rt_frame(sig
, ka
, info
, set
, regs
);
683 force_sigsegv(sig
, current
);
691 handle_signal(unsigned long sig
, siginfo_t
*info
, struct k_sigaction
*ka
,
692 sigset_t
*oldset
, struct pt_regs
*regs
)
696 /* Are we from a system call? */
697 if (syscall_get_nr(current
, regs
) >= 0) {
698 /* If so, check system call restarting.. */
699 switch (syscall_get_error(current
, regs
)) {
700 case -ERESTART_RESTARTBLOCK
:
701 case -ERESTARTNOHAND
:
706 if (!(ka
->sa
.sa_flags
& SA_RESTART
)) {
711 case -ERESTARTNOINTR
:
712 regs
->ax
= regs
->orig_ax
;
719 * If TF is set due to a debugger (TIF_FORCED_TF), clear the TF
720 * flag so that register information in the sigcontext is correct.
722 if (unlikely(regs
->flags
& X86_EFLAGS_TF
) &&
723 likely(test_and_clear_thread_flag(TIF_FORCED_TF
)))
724 regs
->flags
&= ~X86_EFLAGS_TF
;
726 ret
= setup_rt_frame(sig
, ka
, info
, oldset
, regs
);
733 * This has nothing to do with segment registers,
734 * despite the name. This magic affects uaccess.h
735 * macros' behavior. Reset it to the normal setting.
741 * Clear the direction flag as per the ABI for function entry.
743 regs
->flags
&= ~X86_EFLAGS_DF
;
746 * Clear TF when entering the signal handler, but
747 * notify any tracer that was single-stepping it.
748 * The tracer may want to single-step inside the
751 regs
->flags
&= ~X86_EFLAGS_TF
;
753 spin_lock_irq(¤t
->sighand
->siglock
);
754 sigorsets(¤t
->blocked
, ¤t
->blocked
, &ka
->sa
.sa_mask
);
755 if (!(ka
->sa
.sa_flags
& SA_NODEFER
))
756 sigaddset(¤t
->blocked
, sig
);
758 spin_unlock_irq(¤t
->sighand
->siglock
);
760 tracehook_signal_handler(sig
, info
, ka
, regs
,
761 test_thread_flag(TIF_SINGLESTEP
));
767 #define NR_restart_syscall __NR_restart_syscall
768 #else /* !CONFIG_X86_32 */
769 #define NR_restart_syscall \
770 test_thread_flag(TIF_IA32) ? __NR_ia32_restart_syscall : __NR_restart_syscall
771 #endif /* CONFIG_X86_32 */
774 * Note that 'init' is a special process: it doesn't get signals it doesn't
775 * want to handle. Thus you cannot kill init even with a SIGKILL even by
778 static void do_signal(struct pt_regs
*regs
)
780 struct k_sigaction ka
;
786 * We want the common case to go fast, which is why we may in certain
787 * cases get here from kernel mode. Just return without doing anything
789 * X86_32: vm86 regs switched out by assembly code before reaching
790 * here, so testing against kernel CS suffices.
792 if (!user_mode(regs
))
795 if (current_thread_info()->status
& TS_RESTORE_SIGMASK
)
796 oldset
= ¤t
->saved_sigmask
;
798 oldset
= ¤t
->blocked
;
800 signr
= get_signal_to_deliver(&info
, &ka
, regs
, NULL
);
803 * Re-enable any watchpoints before delivering the
804 * signal to user space. The processor register will
805 * have been cleared if the watchpoint triggered
808 if (current
->thread
.debugreg7
)
809 set_debugreg(current
->thread
.debugreg7
, 7);
811 /* Whee! Actually deliver the signal. */
812 if (handle_signal(signr
, &info
, &ka
, oldset
, regs
) == 0) {
814 * A signal was successfully delivered; the saved
815 * sigmask will have been stored in the signal frame,
816 * and will be restored by sigreturn, so we can simply
817 * clear the TS_RESTORE_SIGMASK flag.
819 current_thread_info()->status
&= ~TS_RESTORE_SIGMASK
;
824 /* Did we come from a system call? */
825 if (syscall_get_nr(current
, regs
) >= 0) {
826 /* Restart the system call - no handlers present */
827 switch (syscall_get_error(current
, regs
)) {
828 case -ERESTARTNOHAND
:
830 case -ERESTARTNOINTR
:
831 regs
->ax
= regs
->orig_ax
;
835 case -ERESTART_RESTARTBLOCK
:
836 regs
->ax
= NR_restart_syscall
;
843 * If there's no signal to deliver, we just put the saved sigmask
846 if (current_thread_info()->status
& TS_RESTORE_SIGMASK
) {
847 current_thread_info()->status
&= ~TS_RESTORE_SIGMASK
;
848 sigprocmask(SIG_SETMASK
, ¤t
->saved_sigmask
, NULL
);
853 * notification of userspace execution resumption
854 * - triggered by the TIF_WORK_MASK flags
857 do_notify_resume(struct pt_regs
*regs
, void *unused
, __u32 thread_info_flags
)
859 #if defined(CONFIG_X86_64) && defined(CONFIG_X86_MCE)
860 /* notify userspace of pending MCEs */
861 if (thread_info_flags
& _TIF_MCE_NOTIFY
)
863 #endif /* CONFIG_X86_64 && CONFIG_X86_MCE */
865 /* deal with pending signal delivery */
866 if (thread_info_flags
& _TIF_SIGPENDING
)
869 if (thread_info_flags
& _TIF_NOTIFY_RESUME
) {
870 clear_thread_flag(TIF_NOTIFY_RESUME
);
871 tracehook_notify_resume(regs
);
875 clear_thread_flag(TIF_IRET
);
876 #endif /* CONFIG_X86_32 */
879 void signal_fault(struct pt_regs
*regs
, void __user
*frame
, char *where
)
881 struct task_struct
*me
= current
;
883 if (show_unhandled_signals
&& printk_ratelimit()) {
885 "%s[%d] bad frame in %s frame:%p ip:%lx sp:%lx orax:%lx",
886 task_pid_nr(current
) > 1 ? KERN_INFO
: KERN_EMERG
,
887 me
->comm
, me
->pid
, where
, frame
,
888 regs
->ip
, regs
->sp
, regs
->orig_ax
);
889 print_vma_addr(" in ", regs
->ip
);
890 printk(KERN_CONT
"\n");
893 force_sig(SIGSEGV
, me
);