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 #include <linux/sched.h>
12 #include <linux/smp.h>
13 #include <linux/kernel.h>
14 #include <linux/signal.h>
15 #include <linux/errno.h>
16 #include <linux/wait.h>
17 #include <linux/ptrace.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>
24 #include <asm/processor.h>
25 #include <asm/ucontext.h>
30 #include <asm/proto.h>
31 #include <asm/ia32_unistd.h>
33 #endif /* CONFIG_X86_64 */
35 #include <asm/syscall.h>
36 #include <asm/syscalls.h>
40 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
42 #define __FIX_EFLAGS (X86_EFLAGS_AC | X86_EFLAGS_OF | \
43 X86_EFLAGS_DF | X86_EFLAGS_TF | X86_EFLAGS_SF | \
44 X86_EFLAGS_ZF | X86_EFLAGS_AF | X86_EFLAGS_PF | \
48 # define FIX_EFLAGS (__FIX_EFLAGS | X86_EFLAGS_RF)
50 # define FIX_EFLAGS __FIX_EFLAGS
54 err |= __get_user(regs->x, &sc->x); \
57 #define COPY_SEG(seg) { \
59 err |= __get_user(tmp, &sc->seg); \
63 #define COPY_SEG_CPL3(seg) { \
65 err |= __get_user(tmp, &sc->seg); \
66 regs->seg = tmp | 3; \
69 #define GET_SEG(seg) { \
71 err |= __get_user(tmp, &sc->seg); \
72 loadsegment(seg, tmp); \
76 restore_sigcontext(struct pt_regs
*regs
, struct sigcontext __user
*sc
,
80 unsigned int tmpflags
;
83 /* Always make any pending restarted system calls return -EINTR */
84 current_thread_info()->restart_block
.fn
= do_no_restart_syscall
;
91 #endif /* CONFIG_X86_32 */
93 COPY(di
); COPY(si
); COPY(bp
); COPY(sp
); COPY(bx
);
94 COPY(dx
); COPY(cx
); COPY(ip
);
105 #endif /* CONFIG_X86_64 */
110 #else /* !CONFIG_X86_32 */
111 /* Kernel saves and restores only the CS segment register on signals,
112 * which is the bare minimum needed to allow mixed 32/64-bit code.
113 * App's signal handler can save/restore other segments if needed. */
115 #endif /* CONFIG_X86_32 */
117 err
|= __get_user(tmpflags
, &sc
->flags
);
118 regs
->flags
= (regs
->flags
& ~FIX_EFLAGS
) | (tmpflags
& FIX_EFLAGS
);
119 regs
->orig_ax
= -1; /* disable syscall checks */
121 err
|= __get_user(buf
, &sc
->fpstate
);
122 err
|= restore_i387_xstate(buf
);
124 err
|= __get_user(*pax
, &sc
->ax
);
129 setup_sigcontext(struct sigcontext __user
*sc
, void __user
*fpstate
,
130 struct pt_regs
*regs
, unsigned long mask
)
138 savesegment(gs
, tmp
);
139 err
|= __put_user(tmp
, (unsigned int __user
*)&sc
->gs
);
141 err
|= __put_user(regs
->fs
, (unsigned int __user
*)&sc
->fs
);
142 err
|= __put_user(regs
->es
, (unsigned int __user
*)&sc
->es
);
143 err
|= __put_user(regs
->ds
, (unsigned int __user
*)&sc
->ds
);
144 #endif /* CONFIG_X86_32 */
146 err
|= __put_user(regs
->di
, &sc
->di
);
147 err
|= __put_user(regs
->si
, &sc
->si
);
148 err
|= __put_user(regs
->bp
, &sc
->bp
);
149 err
|= __put_user(regs
->sp
, &sc
->sp
);
150 err
|= __put_user(regs
->bx
, &sc
->bx
);
151 err
|= __put_user(regs
->dx
, &sc
->dx
);
152 err
|= __put_user(regs
->cx
, &sc
->cx
);
153 err
|= __put_user(regs
->ax
, &sc
->ax
);
155 err
|= __put_user(regs
->r8
, &sc
->r8
);
156 err
|= __put_user(regs
->r9
, &sc
->r9
);
157 err
|= __put_user(regs
->r10
, &sc
->r10
);
158 err
|= __put_user(regs
->r11
, &sc
->r11
);
159 err
|= __put_user(regs
->r12
, &sc
->r12
);
160 err
|= __put_user(regs
->r13
, &sc
->r13
);
161 err
|= __put_user(regs
->r14
, &sc
->r14
);
162 err
|= __put_user(regs
->r15
, &sc
->r15
);
163 #endif /* CONFIG_X86_64 */
165 err
|= __put_user(current
->thread
.trap_no
, &sc
->trapno
);
166 err
|= __put_user(current
->thread
.error_code
, &sc
->err
);
167 err
|= __put_user(regs
->ip
, &sc
->ip
);
169 err
|= __put_user(regs
->cs
, (unsigned int __user
*)&sc
->cs
);
170 err
|= __put_user(regs
->flags
, &sc
->flags
);
171 err
|= __put_user(regs
->sp
, &sc
->sp_at_signal
);
172 err
|= __put_user(regs
->ss
, (unsigned int __user
*)&sc
->ss
);
173 #else /* !CONFIG_X86_32 */
174 err
|= __put_user(regs
->flags
, &sc
->flags
);
175 err
|= __put_user(regs
->cs
, &sc
->cs
);
176 err
|= __put_user(0, &sc
->gs
);
177 err
|= __put_user(0, &sc
->fs
);
178 #endif /* CONFIG_X86_32 */
180 err
|= __put_user(fpstate
, &sc
->fpstate
);
182 /* non-iBCS2 extensions.. */
183 err
|= __put_user(mask
, &sc
->oldmask
);
184 err
|= __put_user(current
->thread
.cr2
, &sc
->cr2
);
190 * Set up a signal frame.
193 static const struct {
197 } __attribute__((packed
)) retcode
= {
198 0xb858, /* popl %eax; movl $..., %eax */
200 0x80cd, /* int $0x80 */
203 static const struct {
208 } __attribute__((packed
)) rt_retcode
= {
209 0xb8, /* movl $..., %eax */
211 0x80cd, /* int $0x80 */
216 * Determine which stack to use..
218 static inline void __user
*
219 get_sigframe(struct k_sigaction
*ka
, struct pt_regs
*regs
, size_t frame_size
,
224 /* Default to using normal stack */
228 * If we are on the alternate signal stack and would overflow it, don't.
229 * Return an always-bogus address instead so we will die with SIGSEGV.
231 if (on_sig_stack(sp
) && !likely(on_sig_stack(sp
- frame_size
)))
232 return (void __user
*) -1L;
234 /* This is the X/Open sanctioned signal stack switching. */
235 if (ka
->sa
.sa_flags
& SA_ONSTACK
) {
236 if (sas_ss_flags(sp
) == 0)
237 sp
= current
->sas_ss_sp
+ current
->sas_ss_size
;
239 /* This is the legacy signal stack switching. */
240 if ((regs
->ss
& 0xffff) != __USER_DS
&&
241 !(ka
->sa
.sa_flags
& SA_RESTORER
) &&
243 sp
= (unsigned long) ka
->sa
.sa_restorer
;
247 sp
= sp
- sig_xstate_size
;
248 *fpstate
= (struct _fpstate
*) sp
;
249 if (save_i387_xstate(*fpstate
) < 0)
250 return (void __user
*)-1L;
255 * Align the stack pointer according to the i386 ABI,
256 * i.e. so that on function entry ((sp + 4) & 15) == 0.
258 sp
= ((sp
+ 4) & -16ul) - 4;
260 return (void __user
*) sp
;
264 __setup_frame(int sig
, struct k_sigaction
*ka
, sigset_t
*set
,
265 struct pt_regs
*regs
)
267 struct sigframe __user
*frame
;
268 void __user
*restorer
;
270 void __user
*fpstate
= NULL
;
272 frame
= get_sigframe(ka
, regs
, sizeof(*frame
), &fpstate
);
274 if (!access_ok(VERIFY_WRITE
, frame
, sizeof(*frame
)))
277 if (__put_user(sig
, &frame
->sig
))
280 if (setup_sigcontext(&frame
->sc
, fpstate
, regs
, set
->sig
[0]))
283 if (_NSIG_WORDS
> 1) {
284 if (__copy_to_user(&frame
->extramask
, &set
->sig
[1],
285 sizeof(frame
->extramask
)))
289 if (current
->mm
->context
.vdso
)
290 restorer
= VDSO32_SYMBOL(current
->mm
->context
.vdso
, sigreturn
);
292 restorer
= &frame
->retcode
;
293 if (ka
->sa
.sa_flags
& SA_RESTORER
)
294 restorer
= ka
->sa
.sa_restorer
;
296 /* Set up to return from userspace. */
297 err
|= __put_user(restorer
, &frame
->pretcode
);
300 * This is popl %eax ; movl $__NR_sigreturn, %eax ; int $0x80
302 * WE DO NOT USE IT ANY MORE! It's only left here for historical
303 * reasons and because gdb uses it as a signature to notice
304 * signal handler stack frames.
306 err
|= __put_user(*((u64
*)&retcode
), (u64
*)frame
->retcode
);
311 /* Set up registers for signal handler */
312 regs
->sp
= (unsigned long)frame
;
313 regs
->ip
= (unsigned long)ka
->sa
.sa_handler
;
314 regs
->ax
= (unsigned long)sig
;
318 regs
->ds
= __USER_DS
;
319 regs
->es
= __USER_DS
;
320 regs
->ss
= __USER_DS
;
321 regs
->cs
= __USER_CS
;
326 static int __setup_rt_frame(int sig
, struct k_sigaction
*ka
, siginfo_t
*info
,
327 sigset_t
*set
, struct pt_regs
*regs
)
329 struct rt_sigframe __user
*frame
;
330 void __user
*restorer
;
332 void __user
*fpstate
= NULL
;
334 frame
= get_sigframe(ka
, regs
, sizeof(*frame
), &fpstate
);
336 if (!access_ok(VERIFY_WRITE
, frame
, sizeof(*frame
)))
339 err
|= __put_user(sig
, &frame
->sig
);
340 err
|= __put_user(&frame
->info
, &frame
->pinfo
);
341 err
|= __put_user(&frame
->uc
, &frame
->puc
);
342 err
|= copy_siginfo_to_user(&frame
->info
, info
);
346 /* Create the ucontext. */
348 err
|= __put_user(UC_FP_XSTATE
, &frame
->uc
.uc_flags
);
350 err
|= __put_user(0, &frame
->uc
.uc_flags
);
351 err
|= __put_user(0, &frame
->uc
.uc_link
);
352 err
|= __put_user(current
->sas_ss_sp
, &frame
->uc
.uc_stack
.ss_sp
);
353 err
|= __put_user(sas_ss_flags(regs
->sp
),
354 &frame
->uc
.uc_stack
.ss_flags
);
355 err
|= __put_user(current
->sas_ss_size
, &frame
->uc
.uc_stack
.ss_size
);
356 err
|= setup_sigcontext(&frame
->uc
.uc_mcontext
, fpstate
,
358 err
|= __copy_to_user(&frame
->uc
.uc_sigmask
, set
, sizeof(*set
));
362 /* Set up to return from userspace. */
363 restorer
= VDSO32_SYMBOL(current
->mm
->context
.vdso
, rt_sigreturn
);
364 if (ka
->sa
.sa_flags
& SA_RESTORER
)
365 restorer
= ka
->sa
.sa_restorer
;
366 err
|= __put_user(restorer
, &frame
->pretcode
);
369 * This is movl $__NR_rt_sigreturn, %ax ; int $0x80
371 * WE DO NOT USE IT ANY MORE! It's only left here for historical
372 * reasons and because gdb uses it as a signature to notice
373 * signal handler stack frames.
375 err
|= __put_user(*((u64
*)&rt_retcode
), (u64
*)frame
->retcode
);
380 /* Set up registers for signal handler */
381 regs
->sp
= (unsigned long)frame
;
382 regs
->ip
= (unsigned long)ka
->sa
.sa_handler
;
383 regs
->ax
= (unsigned long)sig
;
384 regs
->dx
= (unsigned long)&frame
->info
;
385 regs
->cx
= (unsigned long)&frame
->uc
;
387 regs
->ds
= __USER_DS
;
388 regs
->es
= __USER_DS
;
389 regs
->ss
= __USER_DS
;
390 regs
->cs
= __USER_CS
;
394 #else /* !CONFIG_X86_32 */
396 * Determine which stack to use..
399 get_stack(struct k_sigaction
*ka
, unsigned long sp
, unsigned long size
)
401 /* Default to using normal stack - redzone*/
404 /* This is the X/Open sanctioned signal stack switching. */
405 if (ka
->sa
.sa_flags
& SA_ONSTACK
) {
406 if (sas_ss_flags(sp
) == 0)
407 sp
= current
->sas_ss_sp
+ current
->sas_ss_size
;
410 return (void __user
*)round_down(sp
- size
, 64);
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
;
422 fp
= get_stack(ka
, regs
->sp
, sig_xstate_size
);
423 frame
= (void __user
*)round_down(
424 (unsigned long)fp
- sizeof(struct rt_sigframe
), 16) - 8;
426 if (save_i387_xstate(fp
) < 0)
429 frame
= get_stack(ka
, regs
->sp
, sizeof(struct rt_sigframe
)) - 8;
431 if (!access_ok(VERIFY_WRITE
, frame
, sizeof(*frame
)))
434 if (ka
->sa
.sa_flags
& SA_SIGINFO
) {
435 if (copy_siginfo_to_user(&frame
->info
, info
))
439 /* Create the ucontext. */
441 err
|= __put_user(UC_FP_XSTATE
, &frame
->uc
.uc_flags
);
443 err
|= __put_user(0, &frame
->uc
.uc_flags
);
444 err
|= __put_user(0, &frame
->uc
.uc_link
);
445 err
|= __put_user(me
->sas_ss_sp
, &frame
->uc
.uc_stack
.ss_sp
);
446 err
|= __put_user(sas_ss_flags(regs
->sp
),
447 &frame
->uc
.uc_stack
.ss_flags
);
448 err
|= __put_user(me
->sas_ss_size
, &frame
->uc
.uc_stack
.ss_size
);
449 err
|= setup_sigcontext(&frame
->uc
.uc_mcontext
, fp
, regs
, set
->sig
[0]);
450 err
|= __copy_to_user(&frame
->uc
.uc_sigmask
, set
, sizeof(*set
));
452 /* Set up to return from userspace. If provided, use a stub
453 already in userspace. */
454 /* x86-64 should always use SA_RESTORER. */
455 if (ka
->sa
.sa_flags
& SA_RESTORER
) {
456 err
|= __put_user(ka
->sa
.sa_restorer
, &frame
->pretcode
);
458 /* could use a vstub here */
465 /* Set up registers for signal handler */
467 /* In case the signal handler was declared without prototypes */
470 /* This also works for non SA_SIGINFO handlers because they expect the
471 next argument after the signal number on the stack. */
472 regs
->si
= (unsigned long)&frame
->info
;
473 regs
->dx
= (unsigned long)&frame
->uc
;
474 regs
->ip
= (unsigned long) ka
->sa
.sa_handler
;
476 regs
->sp
= (unsigned long)frame
;
478 /* Set up the CS register to run signal handlers in 64-bit mode,
479 even if the handler happens to be interrupting 32-bit code. */
480 regs
->cs
= __USER_CS
;
484 #endif /* CONFIG_X86_32 */
488 * Atomically swap in the new signal mask, and wait for a signal.
491 sys_sigsuspend(int history0
, int history1
, old_sigset_t mask
)
494 spin_lock_irq(¤t
->sighand
->siglock
);
495 current
->saved_sigmask
= current
->blocked
;
496 siginitset(¤t
->blocked
, mask
);
498 spin_unlock_irq(¤t
->sighand
->siglock
);
500 current
->state
= TASK_INTERRUPTIBLE
;
502 set_restore_sigmask();
504 return -ERESTARTNOHAND
;
508 sys_sigaction(int sig
, const struct old_sigaction __user
*act
,
509 struct old_sigaction __user
*oact
)
511 struct k_sigaction new_ka
, old_ka
;
517 if (!access_ok(VERIFY_READ
, act
, sizeof(*act
)) ||
518 __get_user(new_ka
.sa
.sa_handler
, &act
->sa_handler
) ||
519 __get_user(new_ka
.sa
.sa_restorer
, &act
->sa_restorer
))
522 __get_user(new_ka
.sa
.sa_flags
, &act
->sa_flags
);
523 __get_user(mask
, &act
->sa_mask
);
524 siginitset(&new_ka
.sa
.sa_mask
, mask
);
527 ret
= do_sigaction(sig
, act
? &new_ka
: NULL
, oact
? &old_ka
: NULL
);
530 if (!access_ok(VERIFY_WRITE
, oact
, sizeof(*oact
)) ||
531 __put_user(old_ka
.sa
.sa_handler
, &oact
->sa_handler
) ||
532 __put_user(old_ka
.sa
.sa_restorer
, &oact
->sa_restorer
))
535 __put_user(old_ka
.sa
.sa_flags
, &oact
->sa_flags
);
536 __put_user(old_ka
.sa
.sa_mask
.sig
[0], &oact
->sa_mask
);
541 #endif /* CONFIG_X86_32 */
544 asmlinkage
int sys_sigaltstack(unsigned long bx
)
547 * This is needed to make gcc realize it doesn't own the
550 struct pt_regs
*regs
= (struct pt_regs
*)&bx
;
551 const stack_t __user
*uss
= (const stack_t __user
*)bx
;
552 stack_t __user
*uoss
= (stack_t __user
*)regs
->cx
;
554 return do_sigaltstack(uss
, uoss
, regs
->sp
);
556 #else /* !CONFIG_X86_32 */
558 sys_sigaltstack(const stack_t __user
*uss
, stack_t __user
*uoss
,
559 struct pt_regs
*regs
)
561 return do_sigaltstack(uss
, uoss
, regs
->sp
);
563 #endif /* CONFIG_X86_32 */
566 * Do a signal return; undo the signal stack.
569 asmlinkage
unsigned long sys_sigreturn(unsigned long __unused
)
571 struct sigframe __user
*frame
;
572 struct pt_regs
*regs
;
576 regs
= (struct pt_regs
*) &__unused
;
577 frame
= (struct sigframe __user
*)(regs
->sp
- 8);
579 if (!access_ok(VERIFY_READ
, frame
, sizeof(*frame
)))
581 if (__get_user(set
.sig
[0], &frame
->sc
.oldmask
) || (_NSIG_WORDS
> 1
582 && __copy_from_user(&set
.sig
[1], &frame
->extramask
,
583 sizeof(frame
->extramask
))))
586 sigdelsetmask(&set
, ~_BLOCKABLE
);
587 spin_lock_irq(¤t
->sighand
->siglock
);
588 current
->blocked
= set
;
590 spin_unlock_irq(¤t
->sighand
->siglock
);
592 if (restore_sigcontext(regs
, &frame
->sc
, &ax
))
597 if (show_unhandled_signals
&& printk_ratelimit()) {
598 printk("%s%s[%d] bad frame in sigreturn frame:"
599 "%p ip:%lx sp:%lx oeax:%lx",
600 task_pid_nr(current
) > 1 ? KERN_INFO
: KERN_EMERG
,
601 current
->comm
, task_pid_nr(current
), frame
, regs
->ip
,
602 regs
->sp
, regs
->orig_ax
);
603 print_vma_addr(" in ", regs
->ip
);
604 printk(KERN_CONT
"\n");
607 force_sig(SIGSEGV
, current
);
611 #endif /* CONFIG_X86_32 */
613 static long do_rt_sigreturn(struct pt_regs
*regs
)
615 struct rt_sigframe __user
*frame
;
619 frame
= (struct rt_sigframe __user
*)(regs
->sp
- sizeof(long));
620 if (!access_ok(VERIFY_READ
, frame
, sizeof(*frame
)))
622 if (__copy_from_user(&set
, &frame
->uc
.uc_sigmask
, sizeof(set
)))
625 sigdelsetmask(&set
, ~_BLOCKABLE
);
626 spin_lock_irq(¤t
->sighand
->siglock
);
627 current
->blocked
= set
;
629 spin_unlock_irq(¤t
->sighand
->siglock
);
631 if (restore_sigcontext(regs
, &frame
->uc
.uc_mcontext
, &ax
))
634 if (do_sigaltstack(&frame
->uc
.uc_stack
, NULL
, regs
->sp
) == -EFAULT
)
640 signal_fault(regs
, frame
, "rt_sigreturn");
645 asmlinkage
int sys_rt_sigreturn(unsigned long __unused
)
647 struct pt_regs
*regs
= (struct pt_regs
*)&__unused
;
649 return do_rt_sigreturn(regs
);
651 #else /* !CONFIG_X86_32 */
652 asmlinkage
long sys_rt_sigreturn(struct pt_regs
*regs
)
654 return do_rt_sigreturn(regs
);
656 #endif /* CONFIG_X86_32 */
659 * OK, we're invoking a handler:
661 static int signr_convert(int sig
)
664 struct thread_info
*info
= current_thread_info();
666 if (info
->exec_domain
&& info
->exec_domain
->signal_invmap
&& sig
< 32)
667 return info
->exec_domain
->signal_invmap
[sig
];
668 #endif /* CONFIG_X86_32 */
675 #define ia32_setup_frame __setup_frame
676 #define ia32_setup_rt_frame __setup_rt_frame
678 #else /* !CONFIG_X86_32 */
680 #ifdef CONFIG_IA32_EMULATION
681 #define is_ia32 test_thread_flag(TIF_IA32)
682 #else /* !CONFIG_IA32_EMULATION */
684 #endif /* CONFIG_IA32_EMULATION */
686 #endif /* CONFIG_X86_32 */
689 setup_rt_frame(int sig
, struct k_sigaction
*ka
, siginfo_t
*info
,
690 sigset_t
*set
, struct pt_regs
*regs
)
692 int usig
= signr_convert(sig
);
695 /* Set up the stack frame */
697 if (ka
->sa
.sa_flags
& SA_SIGINFO
)
698 ret
= ia32_setup_rt_frame(usig
, ka
, info
, set
, regs
);
700 ret
= ia32_setup_frame(usig
, ka
, set
, regs
);
702 ret
= __setup_rt_frame(sig
, ka
, info
, set
, regs
);
705 force_sigsegv(sig
, current
);
713 handle_signal(unsigned long sig
, siginfo_t
*info
, struct k_sigaction
*ka
,
714 sigset_t
*oldset
, struct pt_regs
*regs
)
718 /* Are we from a system call? */
719 if (syscall_get_nr(current
, regs
) >= 0) {
720 /* If so, check system call restarting.. */
721 switch (syscall_get_error(current
, regs
)) {
722 case -ERESTART_RESTARTBLOCK
:
723 case -ERESTARTNOHAND
:
728 if (!(ka
->sa
.sa_flags
& SA_RESTART
)) {
733 case -ERESTARTNOINTR
:
734 regs
->ax
= regs
->orig_ax
;
741 * If TF is set due to a debugger (TIF_FORCED_TF), clear the TF
742 * flag so that register information in the sigcontext is correct.
744 if (unlikely(regs
->flags
& X86_EFLAGS_TF
) &&
745 likely(test_and_clear_thread_flag(TIF_FORCED_TF
)))
746 regs
->flags
&= ~X86_EFLAGS_TF
;
748 ret
= setup_rt_frame(sig
, ka
, info
, oldset
, regs
);
755 * This has nothing to do with segment registers,
756 * despite the name. This magic affects uaccess.h
757 * macros' behavior. Reset it to the normal setting.
763 * Clear the direction flag as per the ABI for function entry.
765 regs
->flags
&= ~X86_EFLAGS_DF
;
768 * Clear TF when entering the signal handler, but
769 * notify any tracer that was single-stepping it.
770 * The tracer may want to single-step inside the
773 regs
->flags
&= ~X86_EFLAGS_TF
;
775 spin_lock_irq(¤t
->sighand
->siglock
);
776 sigorsets(¤t
->blocked
, ¤t
->blocked
, &ka
->sa
.sa_mask
);
777 if (!(ka
->sa
.sa_flags
& SA_NODEFER
))
778 sigaddset(¤t
->blocked
, sig
);
780 spin_unlock_irq(¤t
->sighand
->siglock
);
782 tracehook_signal_handler(sig
, info
, ka
, regs
,
783 test_thread_flag(TIF_SINGLESTEP
));
789 #define NR_restart_syscall __NR_restart_syscall
790 #else /* !CONFIG_X86_32 */
791 #define NR_restart_syscall \
792 test_thread_flag(TIF_IA32) ? __NR_ia32_restart_syscall : __NR_restart_syscall
793 #endif /* CONFIG_X86_32 */
796 * Note that 'init' is a special process: it doesn't get signals it doesn't
797 * want to handle. Thus you cannot kill init even with a SIGKILL even by
800 static void do_signal(struct pt_regs
*regs
)
802 struct k_sigaction ka
;
808 * We want the common case to go fast, which is why we may in certain
809 * cases get here from kernel mode. Just return without doing anything
811 * X86_32: vm86 regs switched out by assembly code before reaching
812 * here, so testing against kernel CS suffices.
814 if (!user_mode(regs
))
817 if (current_thread_info()->status
& TS_RESTORE_SIGMASK
)
818 oldset
= ¤t
->saved_sigmask
;
820 oldset
= ¤t
->blocked
;
822 signr
= get_signal_to_deliver(&info
, &ka
, regs
, NULL
);
825 * Re-enable any watchpoints before delivering the
826 * signal to user space. The processor register will
827 * have been cleared if the watchpoint triggered
830 if (current
->thread
.debugreg7
)
831 set_debugreg(current
->thread
.debugreg7
, 7);
833 /* Whee! Actually deliver the signal. */
834 if (handle_signal(signr
, &info
, &ka
, oldset
, regs
) == 0) {
836 * A signal was successfully delivered; the saved
837 * sigmask will have been stored in the signal frame,
838 * and will be restored by sigreturn, so we can simply
839 * clear the TS_RESTORE_SIGMASK flag.
841 current_thread_info()->status
&= ~TS_RESTORE_SIGMASK
;
846 /* Did we come from a system call? */
847 if (syscall_get_nr(current
, regs
) >= 0) {
848 /* Restart the system call - no handlers present */
849 switch (syscall_get_error(current
, regs
)) {
850 case -ERESTARTNOHAND
:
852 case -ERESTARTNOINTR
:
853 regs
->ax
= regs
->orig_ax
;
857 case -ERESTART_RESTARTBLOCK
:
858 regs
->ax
= NR_restart_syscall
;
865 * If there's no signal to deliver, we just put the saved sigmask
868 if (current_thread_info()->status
& TS_RESTORE_SIGMASK
) {
869 current_thread_info()->status
&= ~TS_RESTORE_SIGMASK
;
870 sigprocmask(SIG_SETMASK
, ¤t
->saved_sigmask
, NULL
);
875 * notification of userspace execution resumption
876 * - triggered by the TIF_WORK_MASK flags
879 do_notify_resume(struct pt_regs
*regs
, void *unused
, __u32 thread_info_flags
)
881 #if defined(CONFIG_X86_64) && defined(CONFIG_X86_MCE)
882 /* notify userspace of pending MCEs */
883 if (thread_info_flags
& _TIF_MCE_NOTIFY
)
885 #endif /* CONFIG_X86_64 && CONFIG_X86_MCE */
887 /* deal with pending signal delivery */
888 if (thread_info_flags
& _TIF_SIGPENDING
)
891 if (thread_info_flags
& _TIF_NOTIFY_RESUME
) {
892 clear_thread_flag(TIF_NOTIFY_RESUME
);
893 tracehook_notify_resume(regs
);
897 clear_thread_flag(TIF_IRET
);
898 #endif /* CONFIG_X86_32 */
901 void signal_fault(struct pt_regs
*regs
, void __user
*frame
, char *where
)
903 struct task_struct
*me
= current
;
905 if (show_unhandled_signals
&& printk_ratelimit()) {
907 "%s[%d] bad frame in %s frame:%p ip:%lx sp:%lx orax:%lx",
908 me
->comm
, me
->pid
, where
, frame
,
909 regs
->ip
, regs
->sp
, regs
->orig_ax
);
910 print_vma_addr(" in ", regs
->ip
);
911 printk(KERN_CONT
"\n");
914 force_sig(SIGSEGV
, me
);