Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
1da177e4 LT |
2 | * Copyright (C) 1991, 1992 Linus Torvalds |
3 | * Copyright (C) 2000, 2001, 2002 Andi Kleen SuSE Labs | |
4 | * | |
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 | |
1da177e4 LT |
8 | */ |
9 | ||
10 | #include <linux/sched.h> | |
11 | #include <linux/mm.h> | |
12 | #include <linux/smp.h> | |
1da177e4 LT |
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/unistd.h> | |
19 | #include <linux/stddef.h> | |
20 | #include <linux/personality.h> | |
21 | #include <linux/compiler.h> | |
1a176803 | 22 | #include <asm/processor.h> |
1da177e4 LT |
23 | #include <asm/ucontext.h> |
24 | #include <asm/uaccess.h> | |
25 | #include <asm/i387.h> | |
26 | #include <asm/proto.h> | |
c5924b7d | 27 | #include <asm/ia32_unistd.h> |
e02e68d3 | 28 | #include <asm/mce.h> |
123a6347 | 29 | #include "sigframe.h" |
1da177e4 | 30 | |
1da177e4 LT |
31 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) |
32 | ||
1a176803 HH |
33 | #define __FIX_EFLAGS (X86_EFLAGS_AC | X86_EFLAGS_OF | \ |
34 | X86_EFLAGS_DF | X86_EFLAGS_TF | X86_EFLAGS_SF | \ | |
35 | X86_EFLAGS_ZF | X86_EFLAGS_AF | X86_EFLAGS_PF | \ | |
36 | X86_EFLAGS_CF) | |
37 | ||
38 | #ifdef CONFIG_X86_32 | |
39 | # define FIX_EFLAGS (__FIX_EFLAGS | X86_EFLAGS_RF) | |
40 | #else | |
41 | # define FIX_EFLAGS __FIX_EFLAGS | |
42 | #endif | |
43 | ||
0928d6ef | 44 | int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, |
1da177e4 | 45 | sigset_t *set, struct pt_regs * regs); |
0928d6ef | 46 | int ia32_setup_frame(int sig, struct k_sigaction *ka, |
1da177e4 LT |
47 | sigset_t *set, struct pt_regs * regs); |
48 | ||
1da177e4 LT |
49 | asmlinkage long |
50 | sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss, | |
51 | struct pt_regs *regs) | |
52 | { | |
65ea5b03 | 53 | return do_sigaltstack(uss, uoss, regs->sp); |
1da177e4 LT |
54 | } |
55 | ||
56 | ||
57 | /* | |
58 | * Do a signal return; undo the signal stack. | |
59 | */ | |
1da177e4 | 60 | static int |
866bc13f HH |
61 | restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, |
62 | unsigned long *pax) | |
1da177e4 LT |
63 | { |
64 | unsigned int err = 0; | |
65 | ||
66 | /* Always make any pending restarted system calls return -EINTR */ | |
67 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
68 | ||
69 | #define COPY(x) err |= __get_user(regs->x, &sc->x) | |
70 | ||
742fa54a PA |
71 | COPY(di); COPY(si); COPY(bp); COPY(sp); COPY(bx); |
72 | COPY(dx); COPY(cx); COPY(ip); | |
1da177e4 LT |
73 | COPY(r8); |
74 | COPY(r9); | |
75 | COPY(r10); | |
76 | COPY(r11); | |
77 | COPY(r12); | |
78 | COPY(r13); | |
79 | COPY(r14); | |
80 | COPY(r15); | |
81 | ||
e4e5d324 BF |
82 | /* Kernel saves and restores only the CS segment register on signals, |
83 | * which is the bare minimum needed to allow mixed 32/64-bit code. | |
84 | * App's signal handler can save/restore other segments if needed. */ | |
85 | { | |
86 | unsigned cs; | |
87 | err |= __get_user(cs, &sc->cs); | |
88 | regs->cs = cs | 3; /* Force into user mode */ | |
89 | } | |
90 | ||
1da177e4 LT |
91 | { |
92 | unsigned int tmpflags; | |
742fa54a | 93 | err |= __get_user(tmpflags, &sc->flags); |
1a176803 | 94 | regs->flags = (regs->flags & ~FIX_EFLAGS) | (tmpflags & FIX_EFLAGS); |
65ea5b03 | 95 | regs->orig_ax = -1; /* disable syscall checks */ |
1da177e4 LT |
96 | } |
97 | ||
98 | { | |
99 | struct _fpstate __user * buf; | |
100 | err |= __get_user(buf, &sc->fpstate); | |
101 | ||
102 | if (buf) { | |
103 | if (!access_ok(VERIFY_READ, buf, sizeof(*buf))) | |
104 | goto badframe; | |
105 | err |= restore_i387(buf); | |
106 | } else { | |
107 | struct task_struct *me = current; | |
108 | if (used_math()) { | |
109 | clear_fpu(me); | |
110 | clear_used_math(); | |
111 | } | |
112 | } | |
113 | } | |
114 | ||
866bc13f | 115 | err |= __get_user(*pax, &sc->ax); |
1da177e4 LT |
116 | return err; |
117 | ||
118 | badframe: | |
119 | return 1; | |
120 | } | |
121 | ||
122 | asmlinkage long sys_rt_sigreturn(struct pt_regs *regs) | |
123 | { | |
124 | struct rt_sigframe __user *frame; | |
125 | sigset_t set; | |
65ea5b03 | 126 | unsigned long ax; |
1da177e4 | 127 | |
2d19c458 HH |
128 | frame = (struct rt_sigframe __user *)(regs->sp - sizeof(long)); |
129 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
1da177e4 | 130 | goto badframe; |
2d19c458 | 131 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) |
1da177e4 | 132 | goto badframe; |
1da177e4 LT |
133 | |
134 | sigdelsetmask(&set, ~_BLOCKABLE); | |
135 | spin_lock_irq(¤t->sighand->siglock); | |
136 | current->blocked = set; | |
137 | recalc_sigpending(); | |
138 | spin_unlock_irq(¤t->sighand->siglock); | |
139 | ||
65ea5b03 | 140 | if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &ax)) |
1da177e4 LT |
141 | goto badframe; |
142 | ||
65ea5b03 | 143 | if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->sp) == -EFAULT) |
1da177e4 LT |
144 | goto badframe; |
145 | ||
65ea5b03 | 146 | return ax; |
1da177e4 LT |
147 | |
148 | badframe: | |
149 | signal_fault(regs,frame,"sigreturn"); | |
150 | return 0; | |
151 | } | |
152 | ||
153 | /* | |
154 | * Set up a signal frame. | |
155 | */ | |
156 | ||
157 | static inline int | |
158 | setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, unsigned long mask, struct task_struct *me) | |
159 | { | |
160 | int err = 0; | |
1da177e4 | 161 | |
e4e5d324 | 162 | err |= __put_user(regs->cs, &sc->cs); |
1da177e4 LT |
163 | err |= __put_user(0, &sc->gs); |
164 | err |= __put_user(0, &sc->fs); | |
165 | ||
742fa54a PA |
166 | err |= __put_user(regs->di, &sc->di); |
167 | err |= __put_user(regs->si, &sc->si); | |
168 | err |= __put_user(regs->bp, &sc->bp); | |
169 | err |= __put_user(regs->sp, &sc->sp); | |
170 | err |= __put_user(regs->bx, &sc->bx); | |
171 | err |= __put_user(regs->dx, &sc->dx); | |
172 | err |= __put_user(regs->cx, &sc->cx); | |
173 | err |= __put_user(regs->ax, &sc->ax); | |
1da177e4 LT |
174 | err |= __put_user(regs->r8, &sc->r8); |
175 | err |= __put_user(regs->r9, &sc->r9); | |
176 | err |= __put_user(regs->r10, &sc->r10); | |
177 | err |= __put_user(regs->r11, &sc->r11); | |
178 | err |= __put_user(regs->r12, &sc->r12); | |
179 | err |= __put_user(regs->r13, &sc->r13); | |
180 | err |= __put_user(regs->r14, &sc->r14); | |
181 | err |= __put_user(regs->r15, &sc->r15); | |
182 | err |= __put_user(me->thread.trap_no, &sc->trapno); | |
183 | err |= __put_user(me->thread.error_code, &sc->err); | |
742fa54a PA |
184 | err |= __put_user(regs->ip, &sc->ip); |
185 | err |= __put_user(regs->flags, &sc->flags); | |
1da177e4 LT |
186 | err |= __put_user(mask, &sc->oldmask); |
187 | err |= __put_user(me->thread.cr2, &sc->cr2); | |
188 | ||
189 | return err; | |
190 | } | |
191 | ||
192 | /* | |
193 | * Determine which stack to use.. | |
194 | */ | |
195 | ||
196 | static void __user * | |
197 | get_stack(struct k_sigaction *ka, struct pt_regs *regs, unsigned long size) | |
198 | { | |
65ea5b03 | 199 | unsigned long sp; |
1da177e4 LT |
200 | |
201 | /* Default to using normal stack - redzone*/ | |
65ea5b03 | 202 | sp = regs->sp - 128; |
1da177e4 LT |
203 | |
204 | /* This is the X/Open sanctioned signal stack switching. */ | |
1da177e4 | 205 | if (ka->sa.sa_flags & SA_ONSTACK) { |
65ea5b03 PA |
206 | if (sas_ss_flags(sp) == 0) |
207 | sp = current->sas_ss_sp + current->sas_ss_size; | |
1da177e4 LT |
208 | } |
209 | ||
65ea5b03 | 210 | return (void __user *)round_down(sp - size, 16); |
1da177e4 LT |
211 | } |
212 | ||
0928d6ef | 213 | static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, |
1da177e4 LT |
214 | sigset_t *set, struct pt_regs * regs) |
215 | { | |
216 | struct rt_sigframe __user *frame; | |
217 | struct _fpstate __user *fp = NULL; | |
218 | int err = 0; | |
219 | struct task_struct *me = current; | |
220 | ||
221 | if (used_math()) { | |
222 | fp = get_stack(ka, regs, sizeof(struct _fpstate)); | |
223 | frame = (void __user *)round_down( | |
224 | (unsigned long)fp - sizeof(struct rt_sigframe), 16) - 8; | |
225 | ||
226 | if (!access_ok(VERIFY_WRITE, fp, sizeof(struct _fpstate))) | |
227 | goto give_sigsegv; | |
228 | ||
229 | if (save_i387(fp) < 0) | |
230 | err |= -1; | |
231 | } else | |
232 | frame = get_stack(ka, regs, sizeof(struct rt_sigframe)) - 8; | |
233 | ||
234 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
235 | goto give_sigsegv; | |
236 | ||
237 | if (ka->sa.sa_flags & SA_SIGINFO) { | |
238 | err |= copy_siginfo_to_user(&frame->info, info); | |
239 | if (err) | |
240 | goto give_sigsegv; | |
241 | } | |
242 | ||
243 | /* Create the ucontext. */ | |
244 | err |= __put_user(0, &frame->uc.uc_flags); | |
245 | err |= __put_user(0, &frame->uc.uc_link); | |
246 | err |= __put_user(me->sas_ss_sp, &frame->uc.uc_stack.ss_sp); | |
65ea5b03 | 247 | err |= __put_user(sas_ss_flags(regs->sp), |
1da177e4 LT |
248 | &frame->uc.uc_stack.ss_flags); |
249 | err |= __put_user(me->sas_ss_size, &frame->uc.uc_stack.ss_size); | |
250 | err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, set->sig[0], me); | |
251 | err |= __put_user(fp, &frame->uc.uc_mcontext.fpstate); | |
252 | if (sizeof(*set) == 16) { | |
253 | __put_user(set->sig[0], &frame->uc.uc_sigmask.sig[0]); | |
254 | __put_user(set->sig[1], &frame->uc.uc_sigmask.sig[1]); | |
255 | } else | |
256 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); | |
257 | ||
258 | /* Set up to return from userspace. If provided, use a stub | |
259 | already in userspace. */ | |
260 | /* x86-64 should always use SA_RESTORER. */ | |
261 | if (ka->sa.sa_flags & SA_RESTORER) { | |
262 | err |= __put_user(ka->sa.sa_restorer, &frame->pretcode); | |
263 | } else { | |
264 | /* could use a vstub here */ | |
265 | goto give_sigsegv; | |
266 | } | |
267 | ||
268 | if (err) | |
269 | goto give_sigsegv; | |
270 | ||
1da177e4 | 271 | /* Set up registers for signal handler */ |
65ea5b03 | 272 | regs->di = sig; |
1da177e4 | 273 | /* In case the signal handler was declared without prototypes */ |
65ea5b03 | 274 | regs->ax = 0; |
1da177e4 LT |
275 | |
276 | /* This also works for non SA_SIGINFO handlers because they expect the | |
277 | next argument after the signal number on the stack. */ | |
65ea5b03 PA |
278 | regs->si = (unsigned long)&frame->info; |
279 | regs->dx = (unsigned long)&frame->uc; | |
280 | regs->ip = (unsigned long) ka->sa.sa_handler; | |
1da177e4 | 281 | |
65ea5b03 | 282 | regs->sp = (unsigned long)frame; |
1da177e4 | 283 | |
e4e5d324 BF |
284 | /* Set up the CS register to run signal handlers in 64-bit mode, |
285 | even if the handler happens to be interrupting 32-bit code. */ | |
286 | regs->cs = __USER_CS; | |
287 | ||
1d001df1 | 288 | return 0; |
1da177e4 LT |
289 | |
290 | give_sigsegv: | |
291 | force_sigsegv(sig, current); | |
1d001df1 | 292 | return -EFAULT; |
1da177e4 LT |
293 | } |
294 | ||
40f0933d RM |
295 | /* |
296 | * Return -1L or the syscall number that @regs is executing. | |
297 | */ | |
298 | static long current_syscall(struct pt_regs *regs) | |
299 | { | |
300 | /* | |
301 | * We always sign-extend a -1 value being set here, | |
302 | * so this is always either -1L or a syscall number. | |
303 | */ | |
304 | return regs->orig_ax; | |
305 | } | |
306 | ||
307 | /* | |
308 | * Return a value that is -EFOO if the system call in @regs->orig_ax | |
309 | * returned an error. This only works for @regs from @current. | |
310 | */ | |
311 | static long current_syscall_ret(struct pt_regs *regs) | |
312 | { | |
313 | #ifdef CONFIG_IA32_EMULATION | |
314 | if (test_thread_flag(TIF_IA32)) | |
315 | /* | |
316 | * Sign-extend the value so (int)-EFOO becomes (long)-EFOO | |
317 | * and will match correctly in comparisons. | |
318 | */ | |
319 | return (int) regs->ax; | |
320 | #endif | |
321 | return regs->ax; | |
322 | } | |
323 | ||
1da177e4 LT |
324 | /* |
325 | * OK, we're invoking a handler | |
326 | */ | |
327 | ||
0928d6ef | 328 | static int |
1da177e4 | 329 | handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka, |
ac66f3fd | 330 | sigset_t *oldset, struct pt_regs *regs) |
1da177e4 | 331 | { |
0928d6ef RM |
332 | int ret; |
333 | ||
1da177e4 | 334 | /* Are we from a system call? */ |
40f0933d | 335 | if (current_syscall(regs) >= 0) { |
1da177e4 | 336 | /* If so, check system call restarting.. */ |
40f0933d | 337 | switch (current_syscall_ret(regs)) { |
ac66f3fd HH |
338 | case -ERESTART_RESTARTBLOCK: |
339 | case -ERESTARTNOHAND: | |
340 | regs->ax = -EINTR; | |
341 | break; | |
1da177e4 | 342 | |
ac66f3fd HH |
343 | case -ERESTARTSYS: |
344 | if (!(ka->sa.sa_flags & SA_RESTART)) { | |
345 | regs->ax = -EINTR; | |
1da177e4 | 346 | break; |
ac66f3fd HH |
347 | } |
348 | /* fallthrough */ | |
349 | case -ERESTARTNOINTR: | |
350 | regs->ax = regs->orig_ax; | |
351 | regs->ip -= 2; | |
352 | break; | |
1da177e4 LT |
353 | } |
354 | } | |
355 | ||
d61915da | 356 | /* |
e1f28773 RM |
357 | * If TF is set due to a debugger (TIF_FORCED_TF), clear the TF |
358 | * flag so that register information in the sigcontext is correct. | |
d61915da | 359 | */ |
65ea5b03 | 360 | if (unlikely(regs->flags & X86_EFLAGS_TF) && |
e1f28773 | 361 | likely(test_and_clear_thread_flag(TIF_FORCED_TF))) |
65ea5b03 | 362 | regs->flags &= ~X86_EFLAGS_TF; |
d61915da | 363 | |
1da177e4 LT |
364 | #ifdef CONFIG_IA32_EMULATION |
365 | if (test_thread_flag(TIF_IA32)) { | |
366 | if (ka->sa.sa_flags & SA_SIGINFO) | |
0928d6ef | 367 | ret = ia32_setup_rt_frame(sig, ka, info, oldset, regs); |
1da177e4 | 368 | else |
0928d6ef | 369 | ret = ia32_setup_frame(sig, ka, oldset, regs); |
1da177e4 LT |
370 | } else |
371 | #endif | |
0928d6ef | 372 | ret = setup_rt_frame(sig, ka, info, oldset, regs); |
1da177e4 | 373 | |
1d001df1 | 374 | if (ret == 0) { |
55928e37 RM |
375 | /* |
376 | * This has nothing to do with segment registers, | |
377 | * despite the name. This magic affects uaccess.h | |
378 | * macros' behavior. Reset it to the normal setting. | |
379 | */ | |
380 | set_fs(USER_DS); | |
381 | ||
8b9c5ff3 RM |
382 | /* |
383 | * Clear the direction flag as per the ABI for function entry. | |
384 | */ | |
385 | regs->flags &= ~X86_EFLAGS_DF; | |
386 | ||
387 | /* | |
388 | * Clear TF when entering the signal handler, but | |
389 | * notify any tracer that was single-stepping it. | |
390 | * The tracer may want to single-step inside the | |
391 | * handler too. | |
392 | */ | |
393 | regs->flags &= ~X86_EFLAGS_TF; | |
394 | if (test_thread_flag(TIF_SINGLESTEP)) | |
395 | ptrace_notify(SIGTRAP); | |
396 | ||
1da177e4 LT |
397 | spin_lock_irq(¤t->sighand->siglock); |
398 | sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); | |
69be8f18 SR |
399 | if (!(ka->sa.sa_flags & SA_NODEFER)) |
400 | sigaddset(¤t->blocked,sig); | |
1da177e4 LT |
401 | recalc_sigpending(); |
402 | spin_unlock_irq(¤t->sighand->siglock); | |
403 | } | |
0928d6ef RM |
404 | |
405 | return ret; | |
1da177e4 LT |
406 | } |
407 | ||
408 | /* | |
409 | * Note that 'init' is a special process: it doesn't get signals it doesn't | |
410 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
411 | * mistake. | |
412 | */ | |
1d001df1 | 413 | static void do_signal(struct pt_regs *regs) |
1da177e4 LT |
414 | { |
415 | struct k_sigaction ka; | |
416 | siginfo_t info; | |
417 | int signr; | |
1d001df1 | 418 | sigset_t *oldset; |
1da177e4 LT |
419 | |
420 | /* | |
ac66f3fd HH |
421 | * We want the common case to go fast, which is why we may in certain |
422 | * cases get here from kernel mode. Just return without doing anything | |
1da177e4 | 423 | * if so. |
ac66f3fd HH |
424 | * X86_32: vm86 regs switched out by assembly code before reaching |
425 | * here, so testing against kernel CS suffices. | |
1da177e4 | 426 | */ |
76381fee | 427 | if (!user_mode(regs)) |
1d001df1 | 428 | return; |
1da177e4 | 429 | |
5a8da0ea | 430 | if (current_thread_info()->status & TS_RESTORE_SIGMASK) |
1d001df1 AK |
431 | oldset = ¤t->saved_sigmask; |
432 | else | |
1da177e4 LT |
433 | oldset = ¤t->blocked; |
434 | ||
435 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); | |
436 | if (signr > 0) { | |
676b1855 | 437 | /* Re-enable any watchpoints before delivering the |
1da177e4 LT |
438 | * signal to user space. The processor register will |
439 | * have been cleared if the watchpoint triggered | |
440 | * inside the kernel. | |
441 | */ | |
442 | if (current->thread.debugreg7) | |
e9129e56 | 443 | set_debugreg(current->thread.debugreg7, 7); |
1da177e4 LT |
444 | |
445 | /* Whee! Actually deliver the signal. */ | |
1d001df1 | 446 | if (handle_signal(signr, &info, &ka, oldset, regs) == 0) { |
5a8da0ea RM |
447 | /* |
448 | * A signal was successfully delivered; the saved | |
1d001df1 AK |
449 | * sigmask will have been stored in the signal frame, |
450 | * and will be restored by sigreturn, so we can simply | |
5a8da0ea RM |
451 | * clear the TS_RESTORE_SIGMASK flag. |
452 | */ | |
453 | current_thread_info()->status &= ~TS_RESTORE_SIGMASK; | |
1d001df1 AK |
454 | } |
455 | return; | |
1da177e4 LT |
456 | } |
457 | ||
1da177e4 | 458 | /* Did we come from a system call? */ |
40f0933d | 459 | if (current_syscall(regs) >= 0) { |
1da177e4 | 460 | /* Restart the system call - no handlers present */ |
40f0933d | 461 | switch (current_syscall_ret(regs)) { |
1d001df1 AK |
462 | case -ERESTARTNOHAND: |
463 | case -ERESTARTSYS: | |
464 | case -ERESTARTNOINTR: | |
65ea5b03 PA |
465 | regs->ax = regs->orig_ax; |
466 | regs->ip -= 2; | |
1d001df1 AK |
467 | break; |
468 | case -ERESTART_RESTARTBLOCK: | |
65ea5b03 | 469 | regs->ax = test_thread_flag(TIF_IA32) ? |
607a1685 AK |
470 | __NR_ia32_restart_syscall : |
471 | __NR_restart_syscall; | |
65ea5b03 | 472 | regs->ip -= 2; |
1d001df1 | 473 | break; |
1da177e4 LT |
474 | } |
475 | } | |
1d001df1 | 476 | |
ac66f3fd HH |
477 | /* |
478 | * If there's no signal to deliver, we just put the saved sigmask | |
479 | * back. | |
480 | */ | |
5a8da0ea RM |
481 | if (current_thread_info()->status & TS_RESTORE_SIGMASK) { |
482 | current_thread_info()->status &= ~TS_RESTORE_SIGMASK; | |
1d001df1 AK |
483 | sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); |
484 | } | |
1da177e4 LT |
485 | } |
486 | ||
ac66f3fd HH |
487 | void do_notify_resume(struct pt_regs *regs, void *unused, |
488 | __u32 thread_info_flags) | |
1da177e4 | 489 | { |
1da177e4 LT |
490 | /* Pending single-step? */ |
491 | if (thread_info_flags & _TIF_SINGLESTEP) { | |
053de044 | 492 | regs->flags |= X86_EFLAGS_TF; |
1da177e4 LT |
493 | clear_thread_flag(TIF_SINGLESTEP); |
494 | } | |
495 | ||
e02e68d3 TH |
496 | #ifdef CONFIG_X86_MCE |
497 | /* notify userspace of pending MCEs */ | |
498 | if (thread_info_flags & _TIF_MCE_NOTIFY) | |
499 | mce_notify_user(); | |
500 | #endif /* CONFIG_X86_MCE */ | |
501 | ||
1da177e4 | 502 | /* deal with pending signal delivery */ |
5a8da0ea | 503 | if (thread_info_flags & _TIF_SIGPENDING) |
1d001df1 | 504 | do_signal(regs); |
8f4d37ec PZ |
505 | |
506 | if (thread_info_flags & _TIF_HRTICK_RESCHED) | |
507 | hrtick_resched(); | |
1da177e4 LT |
508 | } |
509 | ||
510 | void signal_fault(struct pt_regs *regs, void __user *frame, char *where) | |
511 | { | |
512 | struct task_struct *me = current; | |
03252919 AK |
513 | if (show_unhandled_signals && printk_ratelimit()) { |
514 | printk("%s[%d] bad frame in %s frame:%p ip:%lx sp:%lx orax:%lx", | |
65ea5b03 | 515 | me->comm,me->pid,where,frame,regs->ip,regs->sp,regs->orig_ax); |
03252919 AK |
516 | print_vma_addr(" in ", regs->ip); |
517 | printk("\n"); | |
518 | } | |
1da177e4 LT |
519 | |
520 | force_sig(SIGSEGV, me); | |
521 | } |