932612887e92ebb241e2e6e0cdcadf9695960fa6
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_i387_xstate(buf
);
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 sp
= regs
->sp
;
211 int onsigstack
= on_sig_stack(sp
);
216 #endif /* CONFIG_X86_64 */
219 /* This is the X/Open sanctioned signal stack switching. */
220 if (ka
->sa
.sa_flags
& SA_ONSTACK
) {
221 if (current
->sas_ss_size
)
222 sp
= current
->sas_ss_sp
+ current
->sas_ss_size
;
225 /* This is the legacy signal stack switching. */
226 if ((regs
->ss
& 0xffff) != __USER_DS
&&
227 !(ka
->sa
.sa_flags
& SA_RESTORER
) &&
229 sp
= (unsigned long) ka
->sa
.sa_restorer
;
230 #endif /* CONFIG_X86_32 */
235 sp
-= sig_xstate_size
;
237 sp
= round_down(sp
, 64);
238 #endif /* CONFIG_X86_64 */
239 *fpstate
= (void __user
*)sp
;
242 sp
= align_sigframe(sp
- frame_size
);
245 * If we are on the alternate signal stack and would overflow it, don't.
246 * Return an always-bogus address instead so we will die with SIGSEGV.
248 if (onsigstack
&& !likely(on_sig_stack(sp
)))
249 return (void __user
*)-1L;
251 /* save i387 state */
252 if (used_math() && save_i387_xstate(*fpstate
) < 0)
253 return (void __user
*)-1L;
255 return (void __user
*)sp
;
259 static const struct {
263 } __attribute__((packed
)) retcode
= {
264 0xb858, /* popl %eax; movl $..., %eax */
266 0x80cd, /* int $0x80 */
269 static const struct {
274 } __attribute__((packed
)) rt_retcode
= {
275 0xb8, /* movl $..., %eax */
277 0x80cd, /* int $0x80 */
282 __setup_frame(int sig
, struct k_sigaction
*ka
, sigset_t
*set
,
283 struct pt_regs
*regs
)
285 struct sigframe __user
*frame
;
286 void __user
*restorer
;
288 void __user
*fpstate
= NULL
;
290 frame
= get_sigframe(ka
, regs
, sizeof(*frame
), &fpstate
);
292 if (!access_ok(VERIFY_WRITE
, frame
, sizeof(*frame
)))
295 if (__put_user(sig
, &frame
->sig
))
298 if (setup_sigcontext(&frame
->sc
, fpstate
, regs
, set
->sig
[0]))
301 if (_NSIG_WORDS
> 1) {
302 if (__copy_to_user(&frame
->extramask
, &set
->sig
[1],
303 sizeof(frame
->extramask
)))
307 if (current
->mm
->context
.vdso
)
308 restorer
= VDSO32_SYMBOL(current
->mm
->context
.vdso
, sigreturn
);
310 restorer
= &frame
->retcode
;
311 if (ka
->sa
.sa_flags
& SA_RESTORER
)
312 restorer
= ka
->sa
.sa_restorer
;
314 /* Set up to return from userspace. */
315 err
|= __put_user(restorer
, &frame
->pretcode
);
318 * This is popl %eax ; movl $__NR_sigreturn, %eax ; int $0x80
320 * WE DO NOT USE IT ANY MORE! It's only left here for historical
321 * reasons and because gdb uses it as a signature to notice
322 * signal handler stack frames.
324 err
|= __put_user(*((u64
*)&retcode
), (u64
*)frame
->retcode
);
329 /* Set up registers for signal handler */
330 regs
->sp
= (unsigned long)frame
;
331 regs
->ip
= (unsigned long)ka
->sa
.sa_handler
;
332 regs
->ax
= (unsigned long)sig
;
336 regs
->ds
= __USER_DS
;
337 regs
->es
= __USER_DS
;
338 regs
->ss
= __USER_DS
;
339 regs
->cs
= __USER_CS
;
344 static int __setup_rt_frame(int sig
, struct k_sigaction
*ka
, siginfo_t
*info
,
345 sigset_t
*set
, struct pt_regs
*regs
)
347 struct rt_sigframe __user
*frame
;
348 void __user
*restorer
;
350 void __user
*fpstate
= NULL
;
352 frame
= get_sigframe(ka
, regs
, sizeof(*frame
), &fpstate
);
354 if (!access_ok(VERIFY_WRITE
, frame
, sizeof(*frame
)))
358 put_user_ex(sig
, &frame
->sig
);
359 put_user_ex(&frame
->info
, &frame
->pinfo
);
360 put_user_ex(&frame
->uc
, &frame
->puc
);
362 /* Create the ucontext. */
364 put_user_ex(UC_FP_XSTATE
, &frame
->uc
.uc_flags
);
366 put_user_ex(0, &frame
->uc
.uc_flags
);
367 put_user_ex(0, &frame
->uc
.uc_link
);
368 put_user_ex(current
->sas_ss_sp
, &frame
->uc
.uc_stack
.ss_sp
);
369 put_user_ex(sas_ss_flags(regs
->sp
),
370 &frame
->uc
.uc_stack
.ss_flags
);
371 put_user_ex(current
->sas_ss_size
, &frame
->uc
.uc_stack
.ss_size
);
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
);
389 err
|= copy_siginfo_to_user(&frame
->info
, info
);
390 err
|= setup_sigcontext(&frame
->uc
.uc_mcontext
, fpstate
,
392 err
|= __copy_to_user(&frame
->uc
.uc_sigmask
, set
, sizeof(*set
));
397 /* Set up registers for signal handler */
398 regs
->sp
= (unsigned long)frame
;
399 regs
->ip
= (unsigned long)ka
->sa
.sa_handler
;
400 regs
->ax
= (unsigned long)sig
;
401 regs
->dx
= (unsigned long)&frame
->info
;
402 regs
->cx
= (unsigned long)&frame
->uc
;
404 regs
->ds
= __USER_DS
;
405 regs
->es
= __USER_DS
;
406 regs
->ss
= __USER_DS
;
407 regs
->cs
= __USER_CS
;
411 #else /* !CONFIG_X86_32 */
412 static int __setup_rt_frame(int sig
, struct k_sigaction
*ka
, siginfo_t
*info
,
413 sigset_t
*set
, struct pt_regs
*regs
)
415 struct rt_sigframe __user
*frame
;
416 void __user
*fp
= NULL
;
418 struct task_struct
*me
= current
;
420 frame
= get_sigframe(ka
, regs
, sizeof(struct rt_sigframe
), &fp
);
422 if (!access_ok(VERIFY_WRITE
, frame
, sizeof(*frame
)))
425 if (ka
->sa
.sa_flags
& SA_SIGINFO
) {
426 if (copy_siginfo_to_user(&frame
->info
, info
))
431 /* Create the ucontext. */
433 put_user_ex(UC_FP_XSTATE
, &frame
->uc
.uc_flags
);
435 put_user_ex(0, &frame
->uc
.uc_flags
);
436 put_user_ex(0, &frame
->uc
.uc_link
);
437 put_user_ex(me
->sas_ss_sp
, &frame
->uc
.uc_stack
.ss_sp
);
438 put_user_ex(sas_ss_flags(regs
->sp
),
439 &frame
->uc
.uc_stack
.ss_flags
);
440 put_user_ex(me
->sas_ss_size
, &frame
->uc
.uc_stack
.ss_size
);
442 /* Set up to return from userspace. If provided, use a stub
443 already in userspace. */
444 /* x86-64 should always use SA_RESTORER. */
445 if (ka
->sa
.sa_flags
& SA_RESTORER
) {
446 put_user_ex(ka
->sa
.sa_restorer
, &frame
->pretcode
);
448 /* could use a vstub here */
451 } put_user_catch(err
);
453 err
|= setup_sigcontext(&frame
->uc
.uc_mcontext
, fp
, regs
, set
->sig
[0]);
454 err
|= __copy_to_user(&frame
->uc
.uc_sigmask
, set
, sizeof(*set
));
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 siginitset(&blocked
, mask
);
489 return sigsuspend(&blocked
);
493 sys_sigaction(int sig
, const struct old_sigaction __user
*act
,
494 struct old_sigaction __user
*oact
)
496 struct k_sigaction new_ka
, old_ka
;
502 if (!access_ok(VERIFY_READ
, act
, sizeof(*act
)))
506 get_user_ex(new_ka
.sa
.sa_handler
, &act
->sa_handler
);
507 get_user_ex(new_ka
.sa
.sa_flags
, &act
->sa_flags
);
508 get_user_ex(mask
, &act
->sa_mask
);
509 get_user_ex(new_ka
.sa
.sa_restorer
, &act
->sa_restorer
);
510 } get_user_catch(ret
);
514 siginitset(&new_ka
.sa
.sa_mask
, mask
);
517 ret
= do_sigaction(sig
, act
? &new_ka
: NULL
, oact
? &old_ka
: NULL
);
520 if (!access_ok(VERIFY_WRITE
, oact
, sizeof(*oact
)))
524 put_user_ex(old_ka
.sa
.sa_handler
, &oact
->sa_handler
);
525 put_user_ex(old_ka
.sa
.sa_flags
, &oact
->sa_flags
);
526 put_user_ex(old_ka
.sa
.sa_mask
.sig
[0], &oact
->sa_mask
);
527 put_user_ex(old_ka
.sa
.sa_restorer
, &oact
->sa_restorer
);
528 } put_user_catch(ret
);
536 #endif /* CONFIG_X86_32 */
539 sys_sigaltstack(const stack_t __user
*uss
, stack_t __user
*uoss
,
540 struct pt_regs
*regs
)
542 return do_sigaltstack(uss
, uoss
, regs
->sp
);
546 * Do a signal return; undo the signal stack.
549 unsigned long sys_sigreturn(struct pt_regs
*regs
)
551 struct sigframe __user
*frame
;
555 frame
= (struct sigframe __user
*)(regs
->sp
- 8);
557 if (!access_ok(VERIFY_READ
, frame
, sizeof(*frame
)))
559 if (__get_user(set
.sig
[0], &frame
->sc
.oldmask
) || (_NSIG_WORDS
> 1
560 && __copy_from_user(&set
.sig
[1], &frame
->extramask
,
561 sizeof(frame
->extramask
))))
564 set_current_blocked(&set
);
566 if (restore_sigcontext(regs
, &frame
->sc
, &ax
))
571 signal_fault(regs
, frame
, "sigreturn");
575 #endif /* CONFIG_X86_32 */
577 long sys_rt_sigreturn(struct pt_regs
*regs
)
579 struct rt_sigframe __user
*frame
;
583 frame
= (struct rt_sigframe __user
*)(regs
->sp
- sizeof(long));
584 if (!access_ok(VERIFY_READ
, frame
, sizeof(*frame
)))
586 if (__copy_from_user(&set
, &frame
->uc
.uc_sigmask
, sizeof(set
)))
589 set_current_blocked(&set
);
591 if (restore_sigcontext(regs
, &frame
->uc
.uc_mcontext
, &ax
))
594 if (do_sigaltstack(&frame
->uc
.uc_stack
, NULL
, regs
->sp
) == -EFAULT
)
600 signal_fault(regs
, frame
, "rt_sigreturn");
605 * OK, we're invoking a handler:
607 static int signr_convert(int sig
)
610 struct thread_info
*info
= current_thread_info();
612 if (info
->exec_domain
&& info
->exec_domain
->signal_invmap
&& sig
< 32)
613 return info
->exec_domain
->signal_invmap
[sig
];
614 #endif /* CONFIG_X86_32 */
621 #define ia32_setup_frame __setup_frame
622 #define ia32_setup_rt_frame __setup_rt_frame
624 #else /* !CONFIG_X86_32 */
626 #ifdef CONFIG_IA32_EMULATION
627 #define is_ia32 test_thread_flag(TIF_IA32)
628 #else /* !CONFIG_IA32_EMULATION */
630 #endif /* CONFIG_IA32_EMULATION */
632 #ifdef CONFIG_X86_X32_ABI
633 #define is_x32 test_thread_flag(TIF_X32)
635 static int x32_setup_rt_frame(int sig
, struct k_sigaction
*ka
,
636 siginfo_t
*info
, compat_sigset_t
*set
,
637 struct pt_regs
*regs
);
638 #else /* !CONFIG_X86_X32_ABI */
640 #endif /* CONFIG_X86_X32_ABI */
642 int ia32_setup_rt_frame(int sig
, struct k_sigaction
*ka
, siginfo_t
*info
,
643 sigset_t
*set
, struct pt_regs
*regs
);
644 int ia32_setup_frame(int sig
, struct k_sigaction
*ka
,
645 sigset_t
*set
, struct pt_regs
*regs
);
647 #endif /* CONFIG_X86_32 */
650 setup_rt_frame(int sig
, struct k_sigaction
*ka
, siginfo_t
*info
,
651 struct pt_regs
*regs
)
653 int usig
= signr_convert(sig
);
654 sigset_t
*set
= sigmask_to_save();
656 /* Set up the stack frame */
658 if (ka
->sa
.sa_flags
& SA_SIGINFO
)
659 return ia32_setup_rt_frame(usig
, ka
, info
, set
, regs
);
661 return ia32_setup_frame(usig
, ka
, set
, regs
);
662 #ifdef CONFIG_X86_X32_ABI
664 return x32_setup_rt_frame(usig
, ka
, info
,
665 (compat_sigset_t
*)set
, regs
);
668 return __setup_rt_frame(sig
, ka
, info
, set
, regs
);
673 handle_signal(unsigned long sig
, siginfo_t
*info
, struct k_sigaction
*ka
,
674 struct pt_regs
*regs
)
676 /* Are we from a system call? */
677 if (syscall_get_nr(current
, regs
) >= 0) {
678 /* If so, check system call restarting.. */
679 switch (syscall_get_error(current
, regs
)) {
680 case -ERESTART_RESTARTBLOCK
:
681 case -ERESTARTNOHAND
:
686 if (!(ka
->sa
.sa_flags
& SA_RESTART
)) {
691 case -ERESTARTNOINTR
:
692 regs
->ax
= regs
->orig_ax
;
699 * If TF is set due to a debugger (TIF_FORCED_TF), clear the TF
700 * flag so that register information in the sigcontext is correct.
702 if (unlikely(regs
->flags
& X86_EFLAGS_TF
) &&
703 likely(test_and_clear_thread_flag(TIF_FORCED_TF
)))
704 regs
->flags
&= ~X86_EFLAGS_TF
;
706 if (setup_rt_frame(sig
, ka
, info
, regs
) < 0) {
707 force_sigsegv(sig
, current
);
712 * Clear the direction flag as per the ABI for function entry.
714 regs
->flags
&= ~X86_EFLAGS_DF
;
717 * Clear TF when entering the signal handler, but
718 * notify any tracer that was single-stepping it.
719 * The tracer may want to single-step inside the
722 regs
->flags
&= ~X86_EFLAGS_TF
;
724 signal_delivered(sig
, info
, ka
, regs
,
725 test_thread_flag(TIF_SINGLESTEP
));
729 #define NR_restart_syscall __NR_restart_syscall
730 #else /* !CONFIG_X86_32 */
731 #define NR_restart_syscall \
732 test_thread_flag(TIF_IA32) ? __NR_ia32_restart_syscall : __NR_restart_syscall
733 #endif /* CONFIG_X86_32 */
736 * Note that 'init' is a special process: it doesn't get signals it doesn't
737 * want to handle. Thus you cannot kill init even with a SIGKILL even by
740 static void do_signal(struct pt_regs
*regs
)
742 struct k_sigaction ka
;
746 signr
= get_signal_to_deliver(&info
, &ka
, regs
, NULL
);
748 /* Whee! Actually deliver the signal. */
749 handle_signal(signr
, &info
, &ka
, regs
);
753 /* Did we come from a system call? */
754 if (syscall_get_nr(current
, regs
) >= 0) {
755 /* Restart the system call - no handlers present */
756 switch (syscall_get_error(current
, regs
)) {
757 case -ERESTARTNOHAND
:
759 case -ERESTARTNOINTR
:
760 regs
->ax
= regs
->orig_ax
;
764 case -ERESTART_RESTARTBLOCK
:
765 regs
->ax
= NR_restart_syscall
;
772 * If there's no signal to deliver, we just put the saved sigmask
775 restore_saved_sigmask();
779 * notification of userspace execution resumption
780 * - triggered by the TIF_WORK_MASK flags
783 do_notify_resume(struct pt_regs
*regs
, void *unused
, __u32 thread_info_flags
)
785 #ifdef CONFIG_X86_MCE
786 /* notify userspace of pending MCEs */
787 if (thread_info_flags
& _TIF_MCE_NOTIFY
)
788 mce_notify_process();
789 #endif /* CONFIG_X86_64 && CONFIG_X86_MCE */
791 if (thread_info_flags
& _TIF_UPROBE
) {
792 clear_thread_flag(TIF_UPROBE
);
793 uprobe_notify_resume(regs
);
796 /* deal with pending signal delivery */
797 if (thread_info_flags
& _TIF_SIGPENDING
)
800 if (thread_info_flags
& _TIF_NOTIFY_RESUME
) {
801 clear_thread_flag(TIF_NOTIFY_RESUME
);
802 tracehook_notify_resume(regs
);
804 if (thread_info_flags
& _TIF_USER_RETURN_NOTIFY
)
805 fire_user_return_notifiers();
808 clear_thread_flag(TIF_IRET
);
809 #endif /* CONFIG_X86_32 */
812 void signal_fault(struct pt_regs
*regs
, void __user
*frame
, char *where
)
814 struct task_struct
*me
= current
;
816 if (show_unhandled_signals
&& printk_ratelimit()) {
818 "%s[%d] bad frame in %s frame:%p ip:%lx sp:%lx orax:%lx",
819 task_pid_nr(current
) > 1 ? KERN_INFO
: KERN_EMERG
,
820 me
->comm
, me
->pid
, where
, frame
,
821 regs
->ip
, regs
->sp
, regs
->orig_ax
);
822 print_vma_addr(" in ", regs
->ip
);
826 force_sig(SIGSEGV
, me
);
829 #ifdef CONFIG_X86_X32_ABI
830 static int x32_setup_rt_frame(int sig
, struct k_sigaction
*ka
,
831 siginfo_t
*info
, compat_sigset_t
*set
,
832 struct pt_regs
*regs
)
834 struct rt_sigframe_x32 __user
*frame
;
835 void __user
*restorer
;
837 void __user
*fpstate
= NULL
;
839 frame
= get_sigframe(ka
, regs
, sizeof(*frame
), &fpstate
);
841 if (!access_ok(VERIFY_WRITE
, frame
, sizeof(*frame
)))
844 if (ka
->sa
.sa_flags
& SA_SIGINFO
) {
845 if (copy_siginfo_to_user32(&frame
->info
, info
))
850 /* Create the ucontext. */
852 put_user_ex(UC_FP_XSTATE
, &frame
->uc
.uc_flags
);
854 put_user_ex(0, &frame
->uc
.uc_flags
);
855 put_user_ex(0, &frame
->uc
.uc_link
);
856 put_user_ex(current
->sas_ss_sp
, &frame
->uc
.uc_stack
.ss_sp
);
857 put_user_ex(sas_ss_flags(regs
->sp
),
858 &frame
->uc
.uc_stack
.ss_flags
);
859 put_user_ex(current
->sas_ss_size
, &frame
->uc
.uc_stack
.ss_size
);
860 put_user_ex(0, &frame
->uc
.uc__pad0
);
862 if (ka
->sa
.sa_flags
& SA_RESTORER
) {
863 restorer
= ka
->sa
.sa_restorer
;
865 /* could use a vstub here */
869 put_user_ex(restorer
, &frame
->pretcode
);
870 } put_user_catch(err
);
872 err
|= setup_sigcontext(&frame
->uc
.uc_mcontext
, fpstate
,
874 err
|= __copy_to_user(&frame
->uc
.uc_sigmask
, set
, sizeof(*set
));
879 /* Set up registers for signal handler */
880 regs
->sp
= (unsigned long) frame
;
881 regs
->ip
= (unsigned long) ka
->sa
.sa_handler
;
883 /* We use the x32 calling convention here... */
885 regs
->si
= (unsigned long) &frame
->info
;
886 regs
->dx
= (unsigned long) &frame
->uc
;
888 loadsegment(ds
, __USER_DS
);
889 loadsegment(es
, __USER_DS
);
891 regs
->cs
= __USER_CS
;
892 regs
->ss
= __USER_DS
;
897 asmlinkage
long sys32_x32_rt_sigreturn(struct pt_regs
*regs
)
899 struct rt_sigframe_x32 __user
*frame
;
902 struct pt_regs tregs
;
904 frame
= (struct rt_sigframe_x32 __user
*)(regs
->sp
- 8);
906 if (!access_ok(VERIFY_READ
, frame
, sizeof(*frame
)))
908 if (__copy_from_user(&set
, &frame
->uc
.uc_sigmask
, sizeof(set
)))
911 set_current_blocked(&set
);
913 if (restore_sigcontext(regs
, &frame
->uc
.uc_mcontext
, &ax
))
917 if (sys32_sigaltstack(&frame
->uc
.uc_stack
, NULL
, &tregs
) == -EFAULT
)
923 signal_fault(regs
, frame
, "x32 rt_sigreturn");
This page took 0.068538 seconds and 5 git commands to generate.