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>
26 #include <asm/processor.h>
27 #include <asm/ucontext.h>
29 #include <asm/fpu-internal.h>
32 #include <asm/sighandling.h>
35 #include <asm/proto.h>
36 #include <asm/ia32_unistd.h>
37 #include <asm/sys_ia32.h>
38 #endif /* CONFIG_X86_64 */
40 #include <asm/syscall.h>
41 #include <asm/syscalls.h>
43 #include <asm/sigframe.h>
46 # define FIX_EFLAGS (__FIX_EFLAGS | X86_EFLAGS_RF)
48 # define FIX_EFLAGS __FIX_EFLAGS
51 #define COPY(x) do { \
52 get_user_ex(regs->x, &sc->x); \
55 #define GET_SEG(seg) ({ \
57 get_user_ex(tmp, &sc->seg); \
61 #define COPY_SEG(seg) do { \
62 regs->seg = GET_SEG(seg); \
65 #define COPY_SEG_CPL3(seg) do { \
66 regs->seg = GET_SEG(seg) | 3; \
69 int restore_sigcontext(struct pt_regs
*regs
, struct sigcontext __user
*sc
,
73 unsigned int tmpflags
;
76 /* Always make any pending restarted system calls return -EINTR */
77 current_thread_info()->restart_block
.fn
= do_no_restart_syscall
;
82 set_user_gs(regs
, GET_SEG(gs
));
86 #endif /* CONFIG_X86_32 */
88 COPY(di
); COPY(si
); COPY(bp
); COPY(sp
); COPY(bx
);
89 COPY(dx
); COPY(cx
); COPY(ip
);
100 #endif /* CONFIG_X86_64 */
105 #else /* !CONFIG_X86_32 */
106 /* Kernel saves and restores only the CS segment register on signals,
107 * which is the bare minimum needed to allow mixed 32/64-bit code.
108 * App's signal handler can save/restore other segments if needed. */
110 #endif /* CONFIG_X86_32 */
112 get_user_ex(tmpflags
, &sc
->flags
);
113 regs
->flags
= (regs
->flags
& ~FIX_EFLAGS
) | (tmpflags
& FIX_EFLAGS
);
114 regs
->orig_ax
= -1; /* disable syscall checks */
116 get_user_ex(buf
, &sc
->fpstate
);
118 get_user_ex(*pax
, &sc
->ax
);
119 } get_user_catch(err
);
121 err
|= restore_xstate_sig(buf
, config_enabled(CONFIG_X86_32
));
126 int setup_sigcontext(struct sigcontext __user
*sc
, void __user
*fpstate
,
127 struct pt_regs
*regs
, unsigned long mask
)
134 put_user_ex(get_user_gs(regs
), (unsigned int __user
*)&sc
->gs
);
135 put_user_ex(regs
->fs
, (unsigned int __user
*)&sc
->fs
);
136 put_user_ex(regs
->es
, (unsigned int __user
*)&sc
->es
);
137 put_user_ex(regs
->ds
, (unsigned int __user
*)&sc
->ds
);
138 #endif /* CONFIG_X86_32 */
140 put_user_ex(regs
->di
, &sc
->di
);
141 put_user_ex(regs
->si
, &sc
->si
);
142 put_user_ex(regs
->bp
, &sc
->bp
);
143 put_user_ex(regs
->sp
, &sc
->sp
);
144 put_user_ex(regs
->bx
, &sc
->bx
);
145 put_user_ex(regs
->dx
, &sc
->dx
);
146 put_user_ex(regs
->cx
, &sc
->cx
);
147 put_user_ex(regs
->ax
, &sc
->ax
);
149 put_user_ex(regs
->r8
, &sc
->r8
);
150 put_user_ex(regs
->r9
, &sc
->r9
);
151 put_user_ex(regs
->r10
, &sc
->r10
);
152 put_user_ex(regs
->r11
, &sc
->r11
);
153 put_user_ex(regs
->r12
, &sc
->r12
);
154 put_user_ex(regs
->r13
, &sc
->r13
);
155 put_user_ex(regs
->r14
, &sc
->r14
);
156 put_user_ex(regs
->r15
, &sc
->r15
);
157 #endif /* CONFIG_X86_64 */
159 put_user_ex(current
->thread
.trap_nr
, &sc
->trapno
);
160 put_user_ex(current
->thread
.error_code
, &sc
->err
);
161 put_user_ex(regs
->ip
, &sc
->ip
);
163 put_user_ex(regs
->cs
, (unsigned int __user
*)&sc
->cs
);
164 put_user_ex(regs
->flags
, &sc
->flags
);
165 put_user_ex(regs
->sp
, &sc
->sp_at_signal
);
166 put_user_ex(regs
->ss
, (unsigned int __user
*)&sc
->ss
);
167 #else /* !CONFIG_X86_32 */
168 put_user_ex(regs
->flags
, &sc
->flags
);
169 put_user_ex(regs
->cs
, &sc
->cs
);
170 put_user_ex(0, &sc
->gs
);
171 put_user_ex(0, &sc
->fs
);
172 #endif /* CONFIG_X86_32 */
174 put_user_ex(fpstate
, &sc
->fpstate
);
176 /* non-iBCS2 extensions.. */
177 put_user_ex(mask
, &sc
->oldmask
);
178 put_user_ex(current
->thread
.cr2
, &sc
->cr2
);
179 } put_user_catch(err
);
185 * Set up a signal frame.
189 * Determine which stack to use..
191 static unsigned long align_sigframe(unsigned long sp
)
195 * Align the stack pointer according to the i386 ABI,
196 * i.e. so that on function entry ((sp + 4) & 15) == 0.
198 sp
= ((sp
+ 4) & -16ul) - 4;
199 #else /* !CONFIG_X86_32 */
200 sp
= round_down(sp
, 16) - 8;
205 static inline void __user
*
206 get_sigframe(struct k_sigaction
*ka
, struct pt_regs
*regs
, size_t frame_size
,
207 void __user
**fpstate
)
209 /* Default to using normal stack */
210 unsigned long math_size
= 0;
211 unsigned long sp
= regs
->sp
;
212 unsigned long buf_fx
= 0;
213 int onsigstack
= on_sig_stack(sp
);
216 if (config_enabled(CONFIG_X86_64
))
220 /* This is the X/Open sanctioned signal stack switching. */
221 if (ka
->sa
.sa_flags
& SA_ONSTACK
) {
222 if (current
->sas_ss_size
)
223 sp
= current
->sas_ss_sp
+ current
->sas_ss_size
;
224 } else if (config_enabled(CONFIG_X86_32
) &&
225 (regs
->ss
& 0xffff) != __USER_DS
&&
226 !(ka
->sa
.sa_flags
& SA_RESTORER
) &&
227 ka
->sa
.sa_restorer
) {
228 /* This is the legacy signal stack switching. */
229 sp
= (unsigned long) ka
->sa
.sa_restorer
;
234 sp
= alloc_mathframe(sp
, config_enabled(CONFIG_X86_32
),
235 &buf_fx
, &math_size
);
236 *fpstate
= (void __user
*)sp
;
239 sp
= align_sigframe(sp
- frame_size
);
242 * If we are on the alternate signal stack and would overflow it, don't.
243 * Return an always-bogus address instead so we will die with SIGSEGV.
245 if (onsigstack
&& !likely(on_sig_stack(sp
)))
246 return (void __user
*)-1L;
248 /* save i387 and extended state */
250 save_xstate_sig(*fpstate
, (void __user
*)buf_fx
, math_size
) < 0)
251 return (void __user
*)-1L;
253 return (void __user
*)sp
;
257 static const struct {
261 } __attribute__((packed
)) retcode
= {
262 0xb858, /* popl %eax; movl $..., %eax */
264 0x80cd, /* int $0x80 */
267 static const struct {
272 } __attribute__((packed
)) rt_retcode
= {
273 0xb8, /* movl $..., %eax */
275 0x80cd, /* int $0x80 */
280 __setup_frame(int sig
, struct k_sigaction
*ka
, sigset_t
*set
,
281 struct pt_regs
*regs
)
283 struct sigframe __user
*frame
;
284 void __user
*restorer
;
286 void __user
*fpstate
= NULL
;
288 frame
= get_sigframe(ka
, regs
, sizeof(*frame
), &fpstate
);
290 if (!access_ok(VERIFY_WRITE
, frame
, sizeof(*frame
)))
293 if (__put_user(sig
, &frame
->sig
))
296 if (setup_sigcontext(&frame
->sc
, fpstate
, regs
, set
->sig
[0]))
299 if (_NSIG_WORDS
> 1) {
300 if (__copy_to_user(&frame
->extramask
, &set
->sig
[1],
301 sizeof(frame
->extramask
)))
305 if (current
->mm
->context
.vdso
)
306 restorer
= VDSO32_SYMBOL(current
->mm
->context
.vdso
, sigreturn
);
308 restorer
= &frame
->retcode
;
309 if (ka
->sa
.sa_flags
& SA_RESTORER
)
310 restorer
= ka
->sa
.sa_restorer
;
312 /* Set up to return from userspace. */
313 err
|= __put_user(restorer
, &frame
->pretcode
);
316 * This is popl %eax ; movl $__NR_sigreturn, %eax ; int $0x80
318 * WE DO NOT USE IT ANY MORE! It's only left here for historical
319 * reasons and because gdb uses it as a signature to notice
320 * signal handler stack frames.
322 err
|= __put_user(*((u64
*)&retcode
), (u64
*)frame
->retcode
);
327 /* Set up registers for signal handler */
328 regs
->sp
= (unsigned long)frame
;
329 regs
->ip
= (unsigned long)ka
->sa
.sa_handler
;
330 regs
->ax
= (unsigned long)sig
;
334 regs
->ds
= __USER_DS
;
335 regs
->es
= __USER_DS
;
336 regs
->ss
= __USER_DS
;
337 regs
->cs
= __USER_CS
;
342 static int __setup_rt_frame(int sig
, struct k_sigaction
*ka
, siginfo_t
*info
,
343 sigset_t
*set
, struct pt_regs
*regs
)
345 struct rt_sigframe __user
*frame
;
346 void __user
*restorer
;
348 void __user
*fpstate
= NULL
;
350 frame
= get_sigframe(ka
, regs
, sizeof(*frame
), &fpstate
);
352 if (!access_ok(VERIFY_WRITE
, frame
, sizeof(*frame
)))
356 put_user_ex(sig
, &frame
->sig
);
357 put_user_ex(&frame
->info
, &frame
->pinfo
);
358 put_user_ex(&frame
->uc
, &frame
->puc
);
360 /* Create the ucontext. */
362 put_user_ex(UC_FP_XSTATE
, &frame
->uc
.uc_flags
);
364 put_user_ex(0, &frame
->uc
.uc_flags
);
365 put_user_ex(0, &frame
->uc
.uc_link
);
366 put_user_ex(current
->sas_ss_sp
, &frame
->uc
.uc_stack
.ss_sp
);
367 put_user_ex(sas_ss_flags(regs
->sp
),
368 &frame
->uc
.uc_stack
.ss_flags
);
369 put_user_ex(current
->sas_ss_size
, &frame
->uc
.uc_stack
.ss_size
);
371 /* Set up to return from userspace. */
372 restorer
= VDSO32_SYMBOL(current
->mm
->context
.vdso
, rt_sigreturn
);
373 if (ka
->sa
.sa_flags
& SA_RESTORER
)
374 restorer
= ka
->sa
.sa_restorer
;
375 put_user_ex(restorer
, &frame
->pretcode
);
378 * This is movl $__NR_rt_sigreturn, %ax ; int $0x80
380 * WE DO NOT USE IT ANY MORE! It's only left here for historical
381 * reasons and because gdb uses it as a signature to notice
382 * signal handler stack frames.
384 put_user_ex(*((u64
*)&rt_retcode
), (u64
*)frame
->retcode
);
385 } put_user_catch(err
);
387 err
|= copy_siginfo_to_user(&frame
->info
, info
);
388 err
|= setup_sigcontext(&frame
->uc
.uc_mcontext
, fpstate
,
390 err
|= __copy_to_user(&frame
->uc
.uc_sigmask
, set
, sizeof(*set
));
395 /* Set up registers for signal handler */
396 regs
->sp
= (unsigned long)frame
;
397 regs
->ip
= (unsigned long)ka
->sa
.sa_handler
;
398 regs
->ax
= (unsigned long)sig
;
399 regs
->dx
= (unsigned long)&frame
->info
;
400 regs
->cx
= (unsigned long)&frame
->uc
;
402 regs
->ds
= __USER_DS
;
403 regs
->es
= __USER_DS
;
404 regs
->ss
= __USER_DS
;
405 regs
->cs
= __USER_CS
;
409 #else /* !CONFIG_X86_32 */
410 static int __setup_rt_frame(int sig
, struct k_sigaction
*ka
, siginfo_t
*info
,
411 sigset_t
*set
, struct pt_regs
*regs
)
413 struct rt_sigframe __user
*frame
;
414 void __user
*fp
= NULL
;
416 struct task_struct
*me
= current
;
418 frame
= get_sigframe(ka
, regs
, sizeof(struct rt_sigframe
), &fp
);
420 if (!access_ok(VERIFY_WRITE
, frame
, sizeof(*frame
)))
423 if (ka
->sa
.sa_flags
& SA_SIGINFO
) {
424 if (copy_siginfo_to_user(&frame
->info
, info
))
429 /* Create the ucontext. */
431 put_user_ex(UC_FP_XSTATE
, &frame
->uc
.uc_flags
);
433 put_user_ex(0, &frame
->uc
.uc_flags
);
434 put_user_ex(0, &frame
->uc
.uc_link
);
435 put_user_ex(me
->sas_ss_sp
, &frame
->uc
.uc_stack
.ss_sp
);
436 put_user_ex(sas_ss_flags(regs
->sp
),
437 &frame
->uc
.uc_stack
.ss_flags
);
438 put_user_ex(me
->sas_ss_size
, &frame
->uc
.uc_stack
.ss_size
);
440 /* Set up to return from userspace. If provided, use a stub
441 already in userspace. */
442 /* x86-64 should always use SA_RESTORER. */
443 if (ka
->sa
.sa_flags
& SA_RESTORER
) {
444 put_user_ex(ka
->sa
.sa_restorer
, &frame
->pretcode
);
446 /* could use a vstub here */
449 } put_user_catch(err
);
451 err
|= setup_sigcontext(&frame
->uc
.uc_mcontext
, fp
, regs
, set
->sig
[0]);
452 err
|= __copy_to_user(&frame
->uc
.uc_sigmask
, set
, sizeof(*set
));
457 /* Set up registers for signal handler */
459 /* In case the signal handler was declared without prototypes */
462 /* This also works for non SA_SIGINFO handlers because they expect the
463 next argument after the signal number on the stack. */
464 regs
->si
= (unsigned long)&frame
->info
;
465 regs
->dx
= (unsigned long)&frame
->uc
;
466 regs
->ip
= (unsigned long) ka
->sa
.sa_handler
;
468 regs
->sp
= (unsigned long)frame
;
470 /* Set up the CS register to run signal handlers in 64-bit mode,
471 even if the handler happens to be interrupting 32-bit code. */
472 regs
->cs
= __USER_CS
;
476 #endif /* CONFIG_X86_32 */
478 static int x32_setup_rt_frame(int sig
, struct k_sigaction
*ka
,
479 siginfo_t
*info
, compat_sigset_t
*set
,
480 struct pt_regs
*regs
)
482 #ifdef CONFIG_X86_X32_ABI
483 struct rt_sigframe_x32 __user
*frame
;
484 void __user
*restorer
;
486 void __user
*fpstate
= NULL
;
488 frame
= get_sigframe(ka
, regs
, sizeof(*frame
), &fpstate
);
490 if (!access_ok(VERIFY_WRITE
, frame
, sizeof(*frame
)))
493 if (ka
->sa
.sa_flags
& SA_SIGINFO
) {
494 if (copy_siginfo_to_user32(&frame
->info
, info
))
499 /* Create the ucontext. */
501 put_user_ex(UC_FP_XSTATE
, &frame
->uc
.uc_flags
);
503 put_user_ex(0, &frame
->uc
.uc_flags
);
504 put_user_ex(0, &frame
->uc
.uc_link
);
505 put_user_ex(current
->sas_ss_sp
, &frame
->uc
.uc_stack
.ss_sp
);
506 put_user_ex(sas_ss_flags(regs
->sp
),
507 &frame
->uc
.uc_stack
.ss_flags
);
508 put_user_ex(current
->sas_ss_size
, &frame
->uc
.uc_stack
.ss_size
);
509 put_user_ex(0, &frame
->uc
.uc__pad0
);
511 if (ka
->sa
.sa_flags
& SA_RESTORER
) {
512 restorer
= ka
->sa
.sa_restorer
;
514 /* could use a vstub here */
518 put_user_ex(restorer
, &frame
->pretcode
);
519 } put_user_catch(err
);
521 err
|= setup_sigcontext(&frame
->uc
.uc_mcontext
, fpstate
,
523 err
|= __copy_to_user(&frame
->uc
.uc_sigmask
, set
, sizeof(*set
));
528 /* Set up registers for signal handler */
529 regs
->sp
= (unsigned long) frame
;
530 regs
->ip
= (unsigned long) ka
->sa
.sa_handler
;
532 /* We use the x32 calling convention here... */
534 regs
->si
= (unsigned long) &frame
->info
;
535 regs
->dx
= (unsigned long) &frame
->uc
;
537 loadsegment(ds
, __USER_DS
);
538 loadsegment(es
, __USER_DS
);
540 regs
->cs
= __USER_CS
;
541 regs
->ss
= __USER_DS
;
542 #endif /* CONFIG_X86_X32_ABI */
549 * Atomically swap in the new signal mask, and wait for a signal.
552 sys_sigsuspend(int history0
, int history1
, old_sigset_t mask
)
555 siginitset(&blocked
, mask
);
556 return sigsuspend(&blocked
);
560 sys_sigaction(int sig
, const struct old_sigaction __user
*act
,
561 struct old_sigaction __user
*oact
)
563 struct k_sigaction new_ka
, old_ka
;
569 if (!access_ok(VERIFY_READ
, act
, sizeof(*act
)))
573 get_user_ex(new_ka
.sa
.sa_handler
, &act
->sa_handler
);
574 get_user_ex(new_ka
.sa
.sa_flags
, &act
->sa_flags
);
575 get_user_ex(mask
, &act
->sa_mask
);
576 get_user_ex(new_ka
.sa
.sa_restorer
, &act
->sa_restorer
);
577 } get_user_catch(ret
);
581 siginitset(&new_ka
.sa
.sa_mask
, mask
);
584 ret
= do_sigaction(sig
, act
? &new_ka
: NULL
, oact
? &old_ka
: NULL
);
587 if (!access_ok(VERIFY_WRITE
, oact
, sizeof(*oact
)))
591 put_user_ex(old_ka
.sa
.sa_handler
, &oact
->sa_handler
);
592 put_user_ex(old_ka
.sa
.sa_flags
, &oact
->sa_flags
);
593 put_user_ex(old_ka
.sa
.sa_mask
.sig
[0], &oact
->sa_mask
);
594 put_user_ex(old_ka
.sa
.sa_restorer
, &oact
->sa_restorer
);
595 } put_user_catch(ret
);
603 #endif /* CONFIG_X86_32 */
606 sys_sigaltstack(const stack_t __user
*uss
, stack_t __user
*uoss
,
607 struct pt_regs
*regs
)
609 return do_sigaltstack(uss
, uoss
, regs
->sp
);
613 * Do a signal return; undo the signal stack.
616 unsigned long sys_sigreturn(struct pt_regs
*regs
)
618 struct sigframe __user
*frame
;
622 frame
= (struct sigframe __user
*)(regs
->sp
- 8);
624 if (!access_ok(VERIFY_READ
, frame
, sizeof(*frame
)))
626 if (__get_user(set
.sig
[0], &frame
->sc
.oldmask
) || (_NSIG_WORDS
> 1
627 && __copy_from_user(&set
.sig
[1], &frame
->extramask
,
628 sizeof(frame
->extramask
))))
631 set_current_blocked(&set
);
633 if (restore_sigcontext(regs
, &frame
->sc
, &ax
))
638 signal_fault(regs
, frame
, "sigreturn");
642 #endif /* CONFIG_X86_32 */
644 long sys_rt_sigreturn(struct pt_regs
*regs
)
646 struct rt_sigframe __user
*frame
;
650 frame
= (struct rt_sigframe __user
*)(regs
->sp
- sizeof(long));
651 if (!access_ok(VERIFY_READ
, frame
, sizeof(*frame
)))
653 if (__copy_from_user(&set
, &frame
->uc
.uc_sigmask
, sizeof(set
)))
656 set_current_blocked(&set
);
658 if (restore_sigcontext(regs
, &frame
->uc
.uc_mcontext
, &ax
))
661 if (do_sigaltstack(&frame
->uc
.uc_stack
, NULL
, regs
->sp
) == -EFAULT
)
667 signal_fault(regs
, frame
, "rt_sigreturn");
672 * OK, we're invoking a handler:
674 static int signr_convert(int sig
)
677 struct thread_info
*info
= current_thread_info();
679 if (info
->exec_domain
&& info
->exec_domain
->signal_invmap
&& sig
< 32)
680 return info
->exec_domain
->signal_invmap
[sig
];
681 #endif /* CONFIG_X86_32 */
686 setup_rt_frame(int sig
, struct k_sigaction
*ka
, siginfo_t
*info
,
687 struct pt_regs
*regs
)
689 int usig
= signr_convert(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()) {
695 if (ka
->sa
.sa_flags
& SA_SIGINFO
)
696 return ia32_setup_rt_frame(usig
, ka
, info
, cset
, regs
);
698 return ia32_setup_frame(usig
, ka
, cset
, regs
);
699 } else if (is_x32_frame()) {
700 return x32_setup_rt_frame(usig
, ka
, info
, cset
, regs
);
702 return __setup_rt_frame(sig
, ka
, info
, set
, regs
);
707 handle_signal(unsigned long sig
, siginfo_t
*info
, struct k_sigaction
*ka
,
708 struct pt_regs
*regs
)
710 /* Are we from a system call? */
711 if (syscall_get_nr(current
, regs
) >= 0) {
712 /* If so, check system call restarting.. */
713 switch (syscall_get_error(current
, regs
)) {
714 case -ERESTART_RESTARTBLOCK
:
715 case -ERESTARTNOHAND
:
720 if (!(ka
->sa
.sa_flags
& SA_RESTART
)) {
725 case -ERESTARTNOINTR
:
726 regs
->ax
= regs
->orig_ax
;
733 * If TF is set due to a debugger (TIF_FORCED_TF), clear the TF
734 * flag so that register information in the sigcontext is correct.
736 if (unlikely(regs
->flags
& X86_EFLAGS_TF
) &&
737 likely(test_and_clear_thread_flag(TIF_FORCED_TF
)))
738 regs
->flags
&= ~X86_EFLAGS_TF
;
740 if (setup_rt_frame(sig
, ka
, info
, regs
) < 0) {
741 force_sigsegv(sig
, current
);
746 * Clear the direction flag as per the ABI for function entry.
748 regs
->flags
&= ~X86_EFLAGS_DF
;
751 * Clear TF when entering the signal handler, but
752 * notify any tracer that was single-stepping it.
753 * The tracer may want to single-step inside the
756 regs
->flags
&= ~X86_EFLAGS_TF
;
758 signal_delivered(sig
, info
, ka
, regs
,
759 test_thread_flag(TIF_SINGLESTEP
));
763 #define NR_restart_syscall __NR_restart_syscall
764 #else /* !CONFIG_X86_32 */
765 #define NR_restart_syscall \
766 test_thread_flag(TIF_IA32) ? __NR_ia32_restart_syscall : __NR_restart_syscall
767 #endif /* CONFIG_X86_32 */
770 * Note that 'init' is a special process: it doesn't get signals it doesn't
771 * want to handle. Thus you cannot kill init even with a SIGKILL even by
774 static void do_signal(struct pt_regs
*regs
)
776 struct k_sigaction ka
;
780 signr
= get_signal_to_deliver(&info
, &ka
, regs
, NULL
);
782 /* Whee! Actually deliver the signal. */
783 handle_signal(signr
, &info
, &ka
, regs
);
787 /* Did we come from a system call? */
788 if (syscall_get_nr(current
, regs
) >= 0) {
789 /* Restart the system call - no handlers present */
790 switch (syscall_get_error(current
, regs
)) {
791 case -ERESTARTNOHAND
:
793 case -ERESTARTNOINTR
:
794 regs
->ax
= regs
->orig_ax
;
798 case -ERESTART_RESTARTBLOCK
:
799 regs
->ax
= NR_restart_syscall
;
806 * If there's no signal to deliver, we just put the saved sigmask
809 restore_saved_sigmask();
813 * notification of userspace execution resumption
814 * - triggered by the TIF_WORK_MASK flags
817 do_notify_resume(struct pt_regs
*regs
, void *unused
, __u32 thread_info_flags
)
821 #ifdef CONFIG_X86_MCE
822 /* notify userspace of pending MCEs */
823 if (thread_info_flags
& _TIF_MCE_NOTIFY
)
824 mce_notify_process();
825 #endif /* CONFIG_X86_64 && CONFIG_X86_MCE */
827 if (thread_info_flags
& _TIF_UPROBE
) {
828 clear_thread_flag(TIF_UPROBE
);
829 uprobe_notify_resume(regs
);
832 /* deal with pending signal delivery */
833 if (thread_info_flags
& _TIF_SIGPENDING
)
836 if (thread_info_flags
& _TIF_NOTIFY_RESUME
) {
837 clear_thread_flag(TIF_NOTIFY_RESUME
);
838 tracehook_notify_resume(regs
);
840 if (thread_info_flags
& _TIF_USER_RETURN_NOTIFY
)
841 fire_user_return_notifiers();
844 clear_thread_flag(TIF_IRET
);
845 #endif /* CONFIG_X86_32 */
850 void signal_fault(struct pt_regs
*regs
, void __user
*frame
, char *where
)
852 struct task_struct
*me
= current
;
854 if (show_unhandled_signals
&& printk_ratelimit()) {
856 "%s[%d] bad frame in %s frame:%p ip:%lx sp:%lx orax:%lx",
857 task_pid_nr(current
) > 1 ? KERN_INFO
: KERN_EMERG
,
858 me
->comm
, me
->pid
, where
, frame
,
859 regs
->ip
, regs
->sp
, regs
->orig_ax
);
860 print_vma_addr(" in ", regs
->ip
);
864 force_sig(SIGSEGV
, me
);
867 #ifdef CONFIG_X86_X32_ABI
868 asmlinkage
long sys32_x32_rt_sigreturn(struct pt_regs
*regs
)
870 struct rt_sigframe_x32 __user
*frame
;
873 struct pt_regs tregs
;
875 frame
= (struct rt_sigframe_x32 __user
*)(regs
->sp
- 8);
877 if (!access_ok(VERIFY_READ
, frame
, sizeof(*frame
)))
879 if (__copy_from_user(&set
, &frame
->uc
.uc_sigmask
, sizeof(set
)))
882 set_current_blocked(&set
);
884 if (restore_sigcontext(regs
, &frame
->uc
.uc_mcontext
, &ax
))
888 if (sys32_sigaltstack(&frame
->uc
.uc_stack
, NULL
, &tregs
) == -EFAULT
)
894 signal_fault(regs
, frame
, "x32 rt_sigreturn");
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