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>
27 #include <asm/sighandling.h>
30 #include <asm/proto.h>
31 #include <asm/ia32_unistd.h>
32 #include <asm/sys_ia32.h>
33 #endif /* CONFIG_X86_64 */
35 #include <asm/syscall.h>
36 #include <asm/syscalls.h>
38 #include <asm/sigframe.h>
41 # define FIX_EFLAGS (__FIX_EFLAGS | X86_EFLAGS_RF)
43 # define FIX_EFLAGS __FIX_EFLAGS
46 #define COPY(x) do { \
47 get_user_ex(regs->x, &sc->x); \
50 #define GET_SEG(seg) ({ \
52 get_user_ex(tmp, &sc->seg); \
56 #define COPY_SEG(seg) do { \
57 regs->seg = GET_SEG(seg); \
60 #define COPY_SEG_CPL3(seg) do { \
61 regs->seg = GET_SEG(seg) | 3; \
64 int restore_sigcontext(struct pt_regs
*regs
, struct sigcontext __user
*sc
,
68 unsigned int tmpflags
;
71 /* Always make any pending restarted system calls return -EINTR */
72 current_thread_info()->restart_block
.fn
= do_no_restart_syscall
;
77 set_user_gs(regs
, GET_SEG(gs
));
81 #endif /* CONFIG_X86_32 */
83 COPY(di
); COPY(si
); COPY(bp
); COPY(sp
); COPY(bx
);
84 COPY(dx
); COPY(cx
); COPY(ip
);
95 #endif /* CONFIG_X86_64 */
100 #else /* !CONFIG_X86_32 */
101 /* Kernel saves and restores only the CS segment register on signals,
102 * which is the bare minimum needed to allow mixed 32/64-bit code.
103 * App's signal handler can save/restore other segments if needed. */
105 #endif /* CONFIG_X86_32 */
107 get_user_ex(tmpflags
, &sc
->flags
);
108 regs
->flags
= (regs
->flags
& ~FIX_EFLAGS
) | (tmpflags
& FIX_EFLAGS
);
109 regs
->orig_ax
= -1; /* disable syscall checks */
111 get_user_ex(buf
, &sc
->fpstate
);
112 err
|= restore_i387_xstate(buf
);
114 get_user_ex(*pax
, &sc
->ax
);
115 } get_user_catch(err
);
120 int setup_sigcontext(struct sigcontext __user
*sc
, void __user
*fpstate
,
121 struct pt_regs
*regs
, unsigned long mask
)
128 put_user_ex(get_user_gs(regs
), (unsigned int __user
*)&sc
->gs
);
129 put_user_ex(regs
->fs
, (unsigned int __user
*)&sc
->fs
);
130 put_user_ex(regs
->es
, (unsigned int __user
*)&sc
->es
);
131 put_user_ex(regs
->ds
, (unsigned int __user
*)&sc
->ds
);
132 #endif /* CONFIG_X86_32 */
134 put_user_ex(regs
->di
, &sc
->di
);
135 put_user_ex(regs
->si
, &sc
->si
);
136 put_user_ex(regs
->bp
, &sc
->bp
);
137 put_user_ex(regs
->sp
, &sc
->sp
);
138 put_user_ex(regs
->bx
, &sc
->bx
);
139 put_user_ex(regs
->dx
, &sc
->dx
);
140 put_user_ex(regs
->cx
, &sc
->cx
);
141 put_user_ex(regs
->ax
, &sc
->ax
);
143 put_user_ex(regs
->r8
, &sc
->r8
);
144 put_user_ex(regs
->r9
, &sc
->r9
);
145 put_user_ex(regs
->r10
, &sc
->r10
);
146 put_user_ex(regs
->r11
, &sc
->r11
);
147 put_user_ex(regs
->r12
, &sc
->r12
);
148 put_user_ex(regs
->r13
, &sc
->r13
);
149 put_user_ex(regs
->r14
, &sc
->r14
);
150 put_user_ex(regs
->r15
, &sc
->r15
);
151 #endif /* CONFIG_X86_64 */
153 put_user_ex(current
->thread
.trap_no
, &sc
->trapno
);
154 put_user_ex(current
->thread
.error_code
, &sc
->err
);
155 put_user_ex(regs
->ip
, &sc
->ip
);
157 put_user_ex(regs
->cs
, (unsigned int __user
*)&sc
->cs
);
158 put_user_ex(regs
->flags
, &sc
->flags
);
159 put_user_ex(regs
->sp
, &sc
->sp_at_signal
);
160 put_user_ex(regs
->ss
, (unsigned int __user
*)&sc
->ss
);
161 #else /* !CONFIG_X86_32 */
162 put_user_ex(regs
->flags
, &sc
->flags
);
163 put_user_ex(regs
->cs
, &sc
->cs
);
164 put_user_ex(0, &sc
->gs
);
165 put_user_ex(0, &sc
->fs
);
166 #endif /* CONFIG_X86_32 */
168 put_user_ex(fpstate
, &sc
->fpstate
);
170 /* non-iBCS2 extensions.. */
171 put_user_ex(mask
, &sc
->oldmask
);
172 put_user_ex(current
->thread
.cr2
, &sc
->cr2
);
173 } put_user_catch(err
);
179 * Set up a signal frame.
183 * Determine which stack to use..
185 static unsigned long align_sigframe(unsigned long sp
)
189 * Align the stack pointer according to the i386 ABI,
190 * i.e. so that on function entry ((sp + 4) & 15) == 0.
192 sp
= ((sp
+ 4) & -16ul) - 4;
193 #else /* !CONFIG_X86_32 */
194 sp
= round_down(sp
, 16) - 8;
199 static inline void __user
*
200 get_sigframe(struct k_sigaction
*ka
, struct pt_regs
*regs
, size_t frame_size
,
201 void __user
**fpstate
)
203 /* Default to using normal stack */
204 unsigned long sp
= regs
->sp
;
205 int onsigstack
= on_sig_stack(sp
);
210 #endif /* CONFIG_X86_64 */
213 /* This is the X/Open sanctioned signal stack switching. */
214 if (ka
->sa
.sa_flags
& SA_ONSTACK
) {
215 if (current
->sas_ss_size
)
216 sp
= current
->sas_ss_sp
+ current
->sas_ss_size
;
219 /* This is the legacy signal stack switching. */
220 if ((regs
->ss
& 0xffff) != __USER_DS
&&
221 !(ka
->sa
.sa_flags
& SA_RESTORER
) &&
223 sp
= (unsigned long) ka
->sa
.sa_restorer
;
224 #endif /* CONFIG_X86_32 */
229 sp
-= sig_xstate_size
;
231 sp
= round_down(sp
, 64);
232 #endif /* CONFIG_X86_64 */
233 *fpstate
= (void __user
*)sp
;
236 sp
= align_sigframe(sp
- frame_size
);
239 * If we are on the alternate signal stack and would overflow it, don't.
240 * Return an always-bogus address instead so we will die with SIGSEGV.
242 if (onsigstack
&& !likely(on_sig_stack(sp
)))
243 return (void __user
*)-1L;
245 /* save i387 state */
246 if (used_math() && save_i387_xstate(*fpstate
) < 0)
247 return (void __user
*)-1L;
249 return (void __user
*)sp
;
253 static const struct {
257 } __attribute__((packed
)) retcode
= {
258 0xb858, /* popl %eax; movl $..., %eax */
260 0x80cd, /* int $0x80 */
263 static const struct {
268 } __attribute__((packed
)) rt_retcode
= {
269 0xb8, /* movl $..., %eax */
271 0x80cd, /* int $0x80 */
276 __setup_frame(int sig
, struct k_sigaction
*ka
, sigset_t
*set
,
277 struct pt_regs
*regs
)
279 struct sigframe __user
*frame
;
280 void __user
*restorer
;
282 void __user
*fpstate
= NULL
;
284 frame
= get_sigframe(ka
, regs
, sizeof(*frame
), &fpstate
);
286 if (!access_ok(VERIFY_WRITE
, frame
, sizeof(*frame
)))
289 if (__put_user(sig
, &frame
->sig
))
292 if (setup_sigcontext(&frame
->sc
, fpstate
, regs
, set
->sig
[0]))
295 if (_NSIG_WORDS
> 1) {
296 if (__copy_to_user(&frame
->extramask
, &set
->sig
[1],
297 sizeof(frame
->extramask
)))
301 if (current
->mm
->context
.vdso
)
302 restorer
= VDSO32_SYMBOL(current
->mm
->context
.vdso
, sigreturn
);
304 restorer
= &frame
->retcode
;
305 if (ka
->sa
.sa_flags
& SA_RESTORER
)
306 restorer
= ka
->sa
.sa_restorer
;
308 /* Set up to return from userspace. */
309 err
|= __put_user(restorer
, &frame
->pretcode
);
312 * This is popl %eax ; movl $__NR_sigreturn, %eax ; int $0x80
314 * WE DO NOT USE IT ANY MORE! It's only left here for historical
315 * reasons and because gdb uses it as a signature to notice
316 * signal handler stack frames.
318 err
|= __put_user(*((u64
*)&retcode
), (u64
*)frame
->retcode
);
323 /* Set up registers for signal handler */
324 regs
->sp
= (unsigned long)frame
;
325 regs
->ip
= (unsigned long)ka
->sa
.sa_handler
;
326 regs
->ax
= (unsigned long)sig
;
330 regs
->ds
= __USER_DS
;
331 regs
->es
= __USER_DS
;
332 regs
->ss
= __USER_DS
;
333 regs
->cs
= __USER_CS
;
338 static int __setup_rt_frame(int sig
, struct k_sigaction
*ka
, siginfo_t
*info
,
339 sigset_t
*set
, struct pt_regs
*regs
)
341 struct rt_sigframe __user
*frame
;
342 void __user
*restorer
;
344 void __user
*fpstate
= NULL
;
346 frame
= get_sigframe(ka
, regs
, sizeof(*frame
), &fpstate
);
348 if (!access_ok(VERIFY_WRITE
, frame
, sizeof(*frame
)))
352 put_user_ex(sig
, &frame
->sig
);
353 put_user_ex(&frame
->info
, &frame
->pinfo
);
354 put_user_ex(&frame
->uc
, &frame
->puc
);
355 err
|= copy_siginfo_to_user(&frame
->info
, info
);
357 /* Create the ucontext. */
359 put_user_ex(UC_FP_XSTATE
, &frame
->uc
.uc_flags
);
361 put_user_ex(0, &frame
->uc
.uc_flags
);
362 put_user_ex(0, &frame
->uc
.uc_link
);
363 put_user_ex(current
->sas_ss_sp
, &frame
->uc
.uc_stack
.ss_sp
);
364 put_user_ex(sas_ss_flags(regs
->sp
),
365 &frame
->uc
.uc_stack
.ss_flags
);
366 put_user_ex(current
->sas_ss_size
, &frame
->uc
.uc_stack
.ss_size
);
367 err
|= setup_sigcontext(&frame
->uc
.uc_mcontext
, fpstate
,
369 err
|= __copy_to_user(&frame
->uc
.uc_sigmask
, set
, sizeof(*set
));
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
);
390 /* Set up registers for signal handler */
391 regs
->sp
= (unsigned long)frame
;
392 regs
->ip
= (unsigned long)ka
->sa
.sa_handler
;
393 regs
->ax
= (unsigned long)sig
;
394 regs
->dx
= (unsigned long)&frame
->info
;
395 regs
->cx
= (unsigned long)&frame
->uc
;
397 regs
->ds
= __USER_DS
;
398 regs
->es
= __USER_DS
;
399 regs
->ss
= __USER_DS
;
400 regs
->cs
= __USER_CS
;
404 #else /* !CONFIG_X86_32 */
405 static int __setup_rt_frame(int sig
, struct k_sigaction
*ka
, siginfo_t
*info
,
406 sigset_t
*set
, struct pt_regs
*regs
)
408 struct rt_sigframe __user
*frame
;
409 void __user
*fp
= NULL
;
411 struct task_struct
*me
= current
;
413 frame
= get_sigframe(ka
, regs
, sizeof(struct rt_sigframe
), &fp
);
415 if (!access_ok(VERIFY_WRITE
, frame
, sizeof(*frame
)))
418 if (ka
->sa
.sa_flags
& SA_SIGINFO
) {
419 if (copy_siginfo_to_user(&frame
->info
, info
))
424 /* Create the ucontext. */
426 put_user_ex(UC_FP_XSTATE
, &frame
->uc
.uc_flags
);
428 put_user_ex(0, &frame
->uc
.uc_flags
);
429 put_user_ex(0, &frame
->uc
.uc_link
);
430 put_user_ex(me
->sas_ss_sp
, &frame
->uc
.uc_stack
.ss_sp
);
431 put_user_ex(sas_ss_flags(regs
->sp
),
432 &frame
->uc
.uc_stack
.ss_flags
);
433 put_user_ex(me
->sas_ss_size
, &frame
->uc
.uc_stack
.ss_size
);
434 err
|= setup_sigcontext(&frame
->uc
.uc_mcontext
, fp
, regs
, set
->sig
[0]);
435 err
|= __copy_to_user(&frame
->uc
.uc_sigmask
, set
, sizeof(*set
));
437 /* Set up to return from userspace. If provided, use a stub
438 already in userspace. */
439 /* x86-64 should always use SA_RESTORER. */
440 if (ka
->sa
.sa_flags
& SA_RESTORER
) {
441 put_user_ex(ka
->sa
.sa_restorer
, &frame
->pretcode
);
443 /* could use a vstub here */
446 } put_user_catch(err
);
451 /* Set up registers for signal handler */
453 /* In case the signal handler was declared without prototypes */
456 /* This also works for non SA_SIGINFO handlers because they expect the
457 next argument after the signal number on the stack. */
458 regs
->si
= (unsigned long)&frame
->info
;
459 regs
->dx
= (unsigned long)&frame
->uc
;
460 regs
->ip
= (unsigned long) ka
->sa
.sa_handler
;
462 regs
->sp
= (unsigned long)frame
;
464 /* Set up the CS register to run signal handlers in 64-bit mode,
465 even if the handler happens to be interrupting 32-bit code. */
466 regs
->cs
= __USER_CS
;
470 #endif /* CONFIG_X86_32 */
474 * Atomically swap in the new signal mask, and wait for a signal.
477 sys_sigsuspend(int history0
, int history1
, old_sigset_t mask
)
481 current
->saved_sigmask
= current
->blocked
;
484 siginitset(&blocked
, mask
);
485 set_current_blocked(&blocked
);
487 current
->state
= TASK_INTERRUPTIBLE
;
490 set_restore_sigmask();
491 return -ERESTARTNOHAND
;
495 sys_sigaction(int sig
, const struct old_sigaction __user
*act
,
496 struct old_sigaction __user
*oact
)
498 struct k_sigaction new_ka
, old_ka
;
504 if (!access_ok(VERIFY_READ
, act
, sizeof(*act
)))
508 get_user_ex(new_ka
.sa
.sa_handler
, &act
->sa_handler
);
509 get_user_ex(new_ka
.sa
.sa_flags
, &act
->sa_flags
);
510 get_user_ex(mask
, &act
->sa_mask
);
511 get_user_ex(new_ka
.sa
.sa_restorer
, &act
->sa_restorer
);
512 } get_user_catch(ret
);
516 siginitset(&new_ka
.sa
.sa_mask
, mask
);
519 ret
= do_sigaction(sig
, act
? &new_ka
: NULL
, oact
? &old_ka
: NULL
);
522 if (!access_ok(VERIFY_WRITE
, oact
, sizeof(*oact
)))
526 put_user_ex(old_ka
.sa
.sa_handler
, &oact
->sa_handler
);
527 put_user_ex(old_ka
.sa
.sa_flags
, &oact
->sa_flags
);
528 put_user_ex(old_ka
.sa
.sa_mask
.sig
[0], &oact
->sa_mask
);
529 put_user_ex(old_ka
.sa
.sa_restorer
, &oact
->sa_restorer
);
530 } put_user_catch(ret
);
538 #endif /* CONFIG_X86_32 */
541 sys_sigaltstack(const stack_t __user
*uss
, stack_t __user
*uoss
,
542 struct pt_regs
*regs
)
544 return do_sigaltstack(uss
, uoss
, regs
->sp
);
548 * Do a signal return; undo the signal stack.
551 unsigned long sys_sigreturn(struct pt_regs
*regs
)
553 struct sigframe __user
*frame
;
557 frame
= (struct sigframe __user
*)(regs
->sp
- 8);
559 if (!access_ok(VERIFY_READ
, frame
, sizeof(*frame
)))
561 if (__get_user(set
.sig
[0], &frame
->sc
.oldmask
) || (_NSIG_WORDS
> 1
562 && __copy_from_user(&set
.sig
[1], &frame
->extramask
,
563 sizeof(frame
->extramask
))))
566 sigdelsetmask(&set
, ~_BLOCKABLE
);
567 set_current_blocked(&set
);
569 if (restore_sigcontext(regs
, &frame
->sc
, &ax
))
574 signal_fault(regs
, frame
, "sigreturn");
578 #endif /* CONFIG_X86_32 */
580 long sys_rt_sigreturn(struct pt_regs
*regs
)
582 struct rt_sigframe __user
*frame
;
586 frame
= (struct rt_sigframe __user
*)(regs
->sp
- sizeof(long));
587 if (!access_ok(VERIFY_READ
, frame
, sizeof(*frame
)))
589 if (__copy_from_user(&set
, &frame
->uc
.uc_sigmask
, sizeof(set
)))
592 sigdelsetmask(&set
, ~_BLOCKABLE
);
593 set_current_blocked(&set
);
595 if (restore_sigcontext(regs
, &frame
->uc
.uc_mcontext
, &ax
))
598 if (do_sigaltstack(&frame
->uc
.uc_stack
, NULL
, regs
->sp
) == -EFAULT
)
604 signal_fault(regs
, frame
, "rt_sigreturn");
609 * OK, we're invoking a handler:
611 static int signr_convert(int sig
)
614 struct thread_info
*info
= current_thread_info();
616 if (info
->exec_domain
&& info
->exec_domain
->signal_invmap
&& sig
< 32)
617 return info
->exec_domain
->signal_invmap
[sig
];
618 #endif /* CONFIG_X86_32 */
625 #define ia32_setup_frame __setup_frame
626 #define ia32_setup_rt_frame __setup_rt_frame
628 #else /* !CONFIG_X86_32 */
630 #ifdef CONFIG_IA32_EMULATION
631 #define is_ia32 test_thread_flag(TIF_IA32)
632 #else /* !CONFIG_IA32_EMULATION */
634 #endif /* CONFIG_IA32_EMULATION */
636 #ifdef CONFIG_X86_X32_ABI
637 #define is_x32 test_thread_flag(TIF_X32)
639 static int x32_setup_rt_frame(int sig
, struct k_sigaction
*ka
,
640 siginfo_t
*info
, compat_sigset_t
*set
,
641 struct pt_regs
*regs
);
642 #else /* !CONFIG_X86_X32_ABI */
644 #endif /* CONFIG_X86_X32_ABI */
646 int ia32_setup_rt_frame(int sig
, struct k_sigaction
*ka
, siginfo_t
*info
,
647 sigset_t
*set
, struct pt_regs
*regs
);
648 int ia32_setup_frame(int sig
, struct k_sigaction
*ka
,
649 sigset_t
*set
, struct pt_regs
*regs
);
651 #endif /* CONFIG_X86_32 */
654 setup_rt_frame(int sig
, struct k_sigaction
*ka
, siginfo_t
*info
,
655 struct pt_regs
*regs
)
657 int usig
= signr_convert(sig
);
658 sigset_t
*set
= ¤t
->blocked
;
661 if (current_thread_info()->status
& TS_RESTORE_SIGMASK
)
662 set
= ¤t
->saved_sigmask
;
664 /* Set up the stack frame */
666 if (ka
->sa
.sa_flags
& SA_SIGINFO
)
667 ret
= ia32_setup_rt_frame(usig
, ka
, info
, set
, regs
);
669 ret
= ia32_setup_frame(usig
, ka
, set
, regs
);
670 #ifdef CONFIG_X86_X32_ABI
672 ret
= x32_setup_rt_frame(usig
, ka
, info
,
673 (compat_sigset_t
*)set
, regs
);
676 ret
= __setup_rt_frame(sig
, ka
, info
, set
, regs
);
680 force_sigsegv(sig
, current
);
684 current_thread_info()->status
&= ~TS_RESTORE_SIGMASK
;
689 handle_signal(unsigned long sig
, siginfo_t
*info
, struct k_sigaction
*ka
,
690 struct pt_regs
*regs
)
694 /* Are we from a system call? */
695 if (syscall_get_nr(current
, regs
) >= 0) {
696 /* If so, check system call restarting.. */
697 switch (syscall_get_error(current
, regs
)) {
698 case -ERESTART_RESTARTBLOCK
:
699 case -ERESTARTNOHAND
:
704 if (!(ka
->sa
.sa_flags
& SA_RESTART
)) {
709 case -ERESTARTNOINTR
:
710 regs
->ax
= regs
->orig_ax
;
717 * If TF is set due to a debugger (TIF_FORCED_TF), clear the TF
718 * flag so that register information in the sigcontext is correct.
720 if (unlikely(regs
->flags
& X86_EFLAGS_TF
) &&
721 likely(test_and_clear_thread_flag(TIF_FORCED_TF
)))
722 regs
->flags
&= ~X86_EFLAGS_TF
;
724 ret
= setup_rt_frame(sig
, ka
, info
, regs
);
730 * Clear the direction flag as per the ABI for function entry.
732 regs
->flags
&= ~X86_EFLAGS_DF
;
735 * Clear TF when entering the signal handler, but
736 * notify any tracer that was single-stepping it.
737 * The tracer may want to single-step inside the
740 regs
->flags
&= ~X86_EFLAGS_TF
;
742 block_sigmask(ka
, sig
);
744 tracehook_signal_handler(sig
, info
, ka
, regs
,
745 test_thread_flag(TIF_SINGLESTEP
));
751 #define NR_restart_syscall __NR_restart_syscall
752 #else /* !CONFIG_X86_32 */
753 #define NR_restart_syscall \
754 test_thread_flag(TIF_IA32) ? __NR_ia32_restart_syscall : __NR_restart_syscall
755 #endif /* CONFIG_X86_32 */
758 * Note that 'init' is a special process: it doesn't get signals it doesn't
759 * want to handle. Thus you cannot kill init even with a SIGKILL even by
762 static void do_signal(struct pt_regs
*regs
)
764 struct k_sigaction ka
;
769 * We want the common case to go fast, which is why we may in certain
770 * cases get here from kernel mode. Just return without doing anything
772 * X86_32: vm86 regs switched out by assembly code before reaching
773 * here, so testing against kernel CS suffices.
775 if (!user_mode(regs
))
778 signr
= get_signal_to_deliver(&info
, &ka
, regs
, NULL
);
780 /* Whee! Actually deliver the signal. */
781 handle_signal(signr
, &info
, &ka
, regs
);
785 /* Did we come from a system call? */
786 if (syscall_get_nr(current
, regs
) >= 0) {
787 /* Restart the system call - no handlers present */
788 switch (syscall_get_error(current
, regs
)) {
789 case -ERESTARTNOHAND
:
791 case -ERESTARTNOINTR
:
792 regs
->ax
= regs
->orig_ax
;
796 case -ERESTART_RESTARTBLOCK
:
797 regs
->ax
= NR_restart_syscall
;
804 * If there's no signal to deliver, we just put the saved sigmask
807 if (current_thread_info()->status
& TS_RESTORE_SIGMASK
) {
808 current_thread_info()->status
&= ~TS_RESTORE_SIGMASK
;
809 set_current_blocked(¤t
->saved_sigmask
);
814 * notification of userspace execution resumption
815 * - triggered by the TIF_WORK_MASK flags
818 do_notify_resume(struct pt_regs
*regs
, void *unused
, __u32 thread_info_flags
)
820 #ifdef CONFIG_X86_MCE
821 /* notify userspace of pending MCEs */
822 if (thread_info_flags
& _TIF_MCE_NOTIFY
)
823 mce_notify_process();
824 #endif /* CONFIG_X86_64 && CONFIG_X86_MCE */
826 /* deal with pending signal delivery */
827 if (thread_info_flags
& _TIF_SIGPENDING
)
830 if (thread_info_flags
& _TIF_NOTIFY_RESUME
) {
831 clear_thread_flag(TIF_NOTIFY_RESUME
);
832 tracehook_notify_resume(regs
);
833 if (current
->replacement_session_keyring
)
834 key_replace_session_keyring();
836 if (thread_info_flags
& _TIF_USER_RETURN_NOTIFY
)
837 fire_user_return_notifiers();
840 clear_thread_flag(TIF_IRET
);
841 #endif /* CONFIG_X86_32 */
844 void signal_fault(struct pt_regs
*regs
, void __user
*frame
, char *where
)
846 struct task_struct
*me
= current
;
848 if (show_unhandled_signals
&& printk_ratelimit()) {
850 "%s[%d] bad frame in %s frame:%p ip:%lx sp:%lx orax:%lx",
851 task_pid_nr(current
) > 1 ? KERN_INFO
: KERN_EMERG
,
852 me
->comm
, me
->pid
, where
, frame
,
853 regs
->ip
, regs
->sp
, regs
->orig_ax
);
854 print_vma_addr(" in ", regs
->ip
);
855 printk(KERN_CONT
"\n");
858 force_sig(SIGSEGV
, me
);
861 #ifdef CONFIG_X86_X32_ABI
862 static int x32_setup_rt_frame(int sig
, struct k_sigaction
*ka
,
863 siginfo_t
*info
, compat_sigset_t
*set
,
864 struct pt_regs
*regs
)
866 struct rt_sigframe_x32 __user
*frame
;
867 void __user
*restorer
;
869 void __user
*fpstate
= NULL
;
871 frame
= get_sigframe(ka
, regs
, sizeof(*frame
), &fpstate
);
873 if (!access_ok(VERIFY_WRITE
, frame
, sizeof(*frame
)))
876 if (ka
->sa
.sa_flags
& SA_SIGINFO
) {
877 if (copy_siginfo_to_user32(&frame
->info
, info
))
882 /* Create the ucontext. */
884 put_user_ex(UC_FP_XSTATE
, &frame
->uc
.uc_flags
);
886 put_user_ex(0, &frame
->uc
.uc_flags
);
887 put_user_ex(0, &frame
->uc
.uc_link
);
888 put_user_ex(current
->sas_ss_sp
, &frame
->uc
.uc_stack
.ss_sp
);
889 put_user_ex(sas_ss_flags(regs
->sp
),
890 &frame
->uc
.uc_stack
.ss_flags
);
891 put_user_ex(current
->sas_ss_size
, &frame
->uc
.uc_stack
.ss_size
);
892 put_user_ex(0, &frame
->uc
.uc__pad0
);
893 err
|= setup_sigcontext(&frame
->uc
.uc_mcontext
, fpstate
,
895 err
|= __copy_to_user(&frame
->uc
.uc_sigmask
, set
, sizeof(*set
));
897 if (ka
->sa
.sa_flags
& SA_RESTORER
) {
898 restorer
= ka
->sa
.sa_restorer
;
900 /* could use a vstub here */
904 put_user_ex(restorer
, &frame
->pretcode
);
905 } put_user_catch(err
);
910 /* Set up registers for signal handler */
911 regs
->sp
= (unsigned long) frame
;
912 regs
->ip
= (unsigned long) ka
->sa
.sa_handler
;
914 /* We use the x32 calling convention here... */
916 regs
->si
= (unsigned long) &frame
->info
;
917 regs
->dx
= (unsigned long) &frame
->uc
;
919 loadsegment(ds
, __USER_DS
);
920 loadsegment(es
, __USER_DS
);
922 regs
->cs
= __USER_CS
;
923 regs
->ss
= __USER_DS
;
928 asmlinkage
long sys32_x32_rt_sigreturn(struct pt_regs
*regs
)
930 struct rt_sigframe_x32 __user
*frame
;
933 struct pt_regs tregs
;
935 frame
= (struct rt_sigframe_x32 __user
*)(regs
->sp
- 8);
937 if (!access_ok(VERIFY_READ
, frame
, sizeof(*frame
)))
939 if (__copy_from_user(&set
, &frame
->uc
.uc_sigmask
, sizeof(set
)))
942 sigdelsetmask(&set
, ~_BLOCKABLE
);
943 set_current_blocked(&set
);
945 if (restore_sigcontext(regs
, &frame
->uc
.uc_mcontext
, &ax
))
949 if (sys32_sigaltstack(&frame
->uc
.uc_stack
, NULL
, &tregs
) == -EFAULT
)
955 signal_fault(regs
, frame
, "x32 rt_sigreturn");