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> | |
36a03308 | 18 | #include <linux/tracehook.h> |
1da177e4 LT |
19 | #include <linux/unistd.h> |
20 | #include <linux/stddef.h> | |
21 | #include <linux/personality.h> | |
22 | #include <linux/compiler.h> | |
caa007dd GP |
23 | #include <linux/uaccess.h> |
24 | ||
1a176803 | 25 | #include <asm/processor.h> |
1da177e4 | 26 | #include <asm/ucontext.h> |
1da177e4 LT |
27 | #include <asm/i387.h> |
28 | #include <asm/proto.h> | |
c5924b7d | 29 | #include <asm/ia32_unistd.h> |
e02e68d3 | 30 | #include <asm/mce.h> |
4dfcbb99 | 31 | #include <asm/syscall.h> |
bbc1f698 | 32 | #include <asm/syscalls.h> |
123a6347 | 33 | #include "sigframe.h" |
1da177e4 | 34 | |
1da177e4 LT |
35 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) |
36 | ||
1a176803 HH |
37 | #define __FIX_EFLAGS (X86_EFLAGS_AC | X86_EFLAGS_OF | \ |
38 | X86_EFLAGS_DF | X86_EFLAGS_TF | X86_EFLAGS_SF | \ | |
39 | X86_EFLAGS_ZF | X86_EFLAGS_AF | X86_EFLAGS_PF | \ | |
40 | X86_EFLAGS_CF) | |
41 | ||
42 | #ifdef CONFIG_X86_32 | |
43 | # define FIX_EFLAGS (__FIX_EFLAGS | X86_EFLAGS_RF) | |
44 | #else | |
45 | # define FIX_EFLAGS __FIX_EFLAGS | |
46 | #endif | |
47 | ||
1da177e4 LT |
48 | asmlinkage long |
49 | sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss, | |
50 | struct pt_regs *regs) | |
51 | { | |
65ea5b03 | 52 | return do_sigaltstack(uss, uoss, regs->sp); |
1da177e4 LT |
53 | } |
54 | ||
a2e8d3dc HS |
55 | #define COPY(x) { \ |
56 | err |= __get_user(regs->x, &sc->x); \ | |
57 | } | |
58 | ||
59 | #define COPY_SEG_STRICT(seg) { \ | |
60 | unsigned short tmp; \ | |
61 | err |= __get_user(tmp, &sc->seg); \ | |
62 | regs->seg = tmp | 3; \ | |
63 | } | |
64 | ||
1da177e4 LT |
65 | /* |
66 | * Do a signal return; undo the signal stack. | |
67 | */ | |
1da177e4 | 68 | static int |
866bc13f HH |
69 | restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, |
70 | unsigned long *pax) | |
1da177e4 | 71 | { |
69e13ad5 HS |
72 | void __user *buf; |
73 | unsigned int tmpflags; | |
1da177e4 LT |
74 | unsigned int err = 0; |
75 | ||
76 | /* Always make any pending restarted system calls return -EINTR */ | |
77 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
78 | ||
742fa54a PA |
79 | COPY(di); COPY(si); COPY(bp); COPY(sp); COPY(bx); |
80 | COPY(dx); COPY(cx); COPY(ip); | |
1da177e4 LT |
81 | COPY(r8); |
82 | COPY(r9); | |
83 | COPY(r10); | |
84 | COPY(r11); | |
85 | COPY(r12); | |
86 | COPY(r13); | |
87 | COPY(r14); | |
88 | COPY(r15); | |
89 | ||
e4e5d324 BF |
90 | /* Kernel saves and restores only the CS segment register on signals, |
91 | * which is the bare minimum needed to allow mixed 32/64-bit code. | |
92 | * App's signal handler can save/restore other segments if needed. */ | |
a2e8d3dc | 93 | COPY_SEG_STRICT(cs); |
e4e5d324 | 94 | |
69e13ad5 HS |
95 | err |= __get_user(tmpflags, &sc->flags); |
96 | regs->flags = (regs->flags & ~FIX_EFLAGS) | (tmpflags & FIX_EFLAGS); | |
97 | regs->orig_ax = -1; /* disable syscall checks */ | |
1da177e4 | 98 | |
69e13ad5 HS |
99 | err |= __get_user(buf, &sc->fpstate); |
100 | err |= restore_i387_xstate(buf); | |
1da177e4 | 101 | |
866bc13f | 102 | err |= __get_user(*pax, &sc->ax); |
1da177e4 | 103 | return err; |
1da177e4 LT |
104 | } |
105 | ||
e6babb6b | 106 | static long do_rt_sigreturn(struct pt_regs *regs) |
1da177e4 LT |
107 | { |
108 | struct rt_sigframe __user *frame; | |
65ea5b03 | 109 | unsigned long ax; |
e6babb6b | 110 | sigset_t set; |
1da177e4 | 111 | |
2d19c458 HH |
112 | frame = (struct rt_sigframe __user *)(regs->sp - sizeof(long)); |
113 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
1da177e4 | 114 | goto badframe; |
2d19c458 | 115 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) |
1da177e4 | 116 | goto badframe; |
1da177e4 LT |
117 | |
118 | sigdelsetmask(&set, ~_BLOCKABLE); | |
119 | spin_lock_irq(¤t->sighand->siglock); | |
120 | current->blocked = set; | |
121 | recalc_sigpending(); | |
122 | spin_unlock_irq(¤t->sighand->siglock); | |
caa007dd | 123 | |
65ea5b03 | 124 | if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &ax)) |
1da177e4 LT |
125 | goto badframe; |
126 | ||
65ea5b03 | 127 | if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->sp) == -EFAULT) |
1da177e4 LT |
128 | goto badframe; |
129 | ||
65ea5b03 | 130 | return ax; |
1da177e4 LT |
131 | |
132 | badframe: | |
e6babb6b | 133 | signal_fault(regs, frame, "rt_sigreturn"); |
1da177e4 | 134 | return 0; |
caa007dd | 135 | } |
1da177e4 | 136 | |
e6babb6b HS |
137 | asmlinkage long sys_rt_sigreturn(struct pt_regs *regs) |
138 | { | |
139 | return do_rt_sigreturn(regs); | |
140 | } | |
141 | ||
1da177e4 LT |
142 | /* |
143 | * Set up a signal frame. | |
144 | */ | |
145 | ||
146 | static inline int | |
caa007dd GP |
147 | setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, |
148 | unsigned long mask, struct task_struct *me) | |
1da177e4 LT |
149 | { |
150 | int err = 0; | |
1da177e4 | 151 | |
e4e5d324 | 152 | err |= __put_user(regs->cs, &sc->cs); |
1da177e4 LT |
153 | err |= __put_user(0, &sc->gs); |
154 | err |= __put_user(0, &sc->fs); | |
155 | ||
742fa54a PA |
156 | err |= __put_user(regs->di, &sc->di); |
157 | err |= __put_user(regs->si, &sc->si); | |
158 | err |= __put_user(regs->bp, &sc->bp); | |
159 | err |= __put_user(regs->sp, &sc->sp); | |
160 | err |= __put_user(regs->bx, &sc->bx); | |
161 | err |= __put_user(regs->dx, &sc->dx); | |
162 | err |= __put_user(regs->cx, &sc->cx); | |
163 | err |= __put_user(regs->ax, &sc->ax); | |
1da177e4 LT |
164 | err |= __put_user(regs->r8, &sc->r8); |
165 | err |= __put_user(regs->r9, &sc->r9); | |
166 | err |= __put_user(regs->r10, &sc->r10); | |
167 | err |= __put_user(regs->r11, &sc->r11); | |
168 | err |= __put_user(regs->r12, &sc->r12); | |
169 | err |= __put_user(regs->r13, &sc->r13); | |
170 | err |= __put_user(regs->r14, &sc->r14); | |
171 | err |= __put_user(regs->r15, &sc->r15); | |
172 | err |= __put_user(me->thread.trap_no, &sc->trapno); | |
173 | err |= __put_user(me->thread.error_code, &sc->err); | |
742fa54a PA |
174 | err |= __put_user(regs->ip, &sc->ip); |
175 | err |= __put_user(regs->flags, &sc->flags); | |
1da177e4 LT |
176 | err |= __put_user(mask, &sc->oldmask); |
177 | err |= __put_user(me->thread.cr2, &sc->cr2); | |
178 | ||
179 | return err; | |
180 | } | |
181 | ||
182 | /* | |
183 | * Determine which stack to use.. | |
184 | */ | |
185 | ||
186 | static void __user * | |
187 | get_stack(struct k_sigaction *ka, struct pt_regs *regs, unsigned long size) | |
188 | { | |
65ea5b03 | 189 | unsigned long sp; |
1da177e4 LT |
190 | |
191 | /* Default to using normal stack - redzone*/ | |
65ea5b03 | 192 | sp = regs->sp - 128; |
1da177e4 LT |
193 | |
194 | /* This is the X/Open sanctioned signal stack switching. */ | |
1da177e4 | 195 | if (ka->sa.sa_flags & SA_ONSTACK) { |
65ea5b03 PA |
196 | if (sas_ss_flags(sp) == 0) |
197 | sp = current->sas_ss_sp + current->sas_ss_size; | |
1da177e4 LT |
198 | } |
199 | ||
c37b5efe | 200 | return (void __user *)round_down(sp - size, 64); |
1da177e4 LT |
201 | } |
202 | ||
1d13024e HS |
203 | static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, |
204 | sigset_t *set, struct pt_regs *regs) | |
1da177e4 LT |
205 | { |
206 | struct rt_sigframe __user *frame; | |
ab513701 | 207 | void __user *fp = NULL; |
1da177e4 LT |
208 | int err = 0; |
209 | struct task_struct *me = current; | |
210 | ||
211 | if (used_math()) { | |
3c1c7f10 | 212 | fp = get_stack(ka, regs, sig_xstate_size); |
1da177e4 LT |
213 | frame = (void __user *)round_down( |
214 | (unsigned long)fp - sizeof(struct rt_sigframe), 16) - 8; | |
215 | ||
ab513701 | 216 | if (save_i387_xstate(fp) < 0) |
2ba48e16 | 217 | return -EFAULT; |
1da177e4 LT |
218 | } else |
219 | frame = get_stack(ka, regs, sizeof(struct rt_sigframe)) - 8; | |
220 | ||
221 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
3d0aedd9 | 222 | return -EFAULT; |
1da177e4 | 223 | |
caa007dd | 224 | if (ka->sa.sa_flags & SA_SIGINFO) { |
2ba48e16 | 225 | if (copy_siginfo_to_user(&frame->info, info)) |
3d0aedd9 | 226 | return -EFAULT; |
1da177e4 | 227 | } |
caa007dd | 228 | |
1da177e4 | 229 | /* Create the ucontext. */ |
c37b5efe SS |
230 | if (cpu_has_xsave) |
231 | err |= __put_user(UC_FP_XSTATE, &frame->uc.uc_flags); | |
232 | else | |
233 | err |= __put_user(0, &frame->uc.uc_flags); | |
1da177e4 LT |
234 | err |= __put_user(0, &frame->uc.uc_link); |
235 | err |= __put_user(me->sas_ss_sp, &frame->uc.uc_stack.ss_sp); | |
65ea5b03 | 236 | err |= __put_user(sas_ss_flags(regs->sp), |
1da177e4 LT |
237 | &frame->uc.uc_stack.ss_flags); |
238 | err |= __put_user(me->sas_ss_size, &frame->uc.uc_stack.ss_size); | |
239 | err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, set->sig[0], me); | |
240 | err |= __put_user(fp, &frame->uc.uc_mcontext.fpstate); | |
caa007dd | 241 | if (sizeof(*set) == 16) { |
1da177e4 | 242 | __put_user(set->sig[0], &frame->uc.uc_sigmask.sig[0]); |
caa007dd | 243 | __put_user(set->sig[1], &frame->uc.uc_sigmask.sig[1]); |
1da177e4 LT |
244 | } else |
245 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); | |
246 | ||
247 | /* Set up to return from userspace. If provided, use a stub | |
248 | already in userspace. */ | |
249 | /* x86-64 should always use SA_RESTORER. */ | |
250 | if (ka->sa.sa_flags & SA_RESTORER) { | |
251 | err |= __put_user(ka->sa.sa_restorer, &frame->pretcode); | |
252 | } else { | |
253 | /* could use a vstub here */ | |
3d0aedd9 | 254 | return -EFAULT; |
1da177e4 LT |
255 | } |
256 | ||
257 | if (err) | |
3d0aedd9 | 258 | return -EFAULT; |
1da177e4 | 259 | |
1da177e4 | 260 | /* Set up registers for signal handler */ |
65ea5b03 | 261 | regs->di = sig; |
caa007dd | 262 | /* In case the signal handler was declared without prototypes */ |
65ea5b03 | 263 | regs->ax = 0; |
1da177e4 LT |
264 | |
265 | /* This also works for non SA_SIGINFO handlers because they expect the | |
266 | next argument after the signal number on the stack. */ | |
65ea5b03 PA |
267 | regs->si = (unsigned long)&frame->info; |
268 | regs->dx = (unsigned long)&frame->uc; | |
269 | regs->ip = (unsigned long) ka->sa.sa_handler; | |
1da177e4 | 270 | |
65ea5b03 | 271 | regs->sp = (unsigned long)frame; |
1da177e4 | 272 | |
e4e5d324 BF |
273 | /* Set up the CS register to run signal handlers in 64-bit mode, |
274 | even if the handler happens to be interrupting 32-bit code. */ | |
275 | regs->cs = __USER_CS; | |
276 | ||
1d001df1 | 277 | return 0; |
1da177e4 LT |
278 | } |
279 | ||
280 | /* | |
281 | * OK, we're invoking a handler | |
caa007dd | 282 | */ |
b94fd698 HS |
283 | static int signr_convert(int sig) |
284 | { | |
285 | return sig; | |
286 | } | |
287 | ||
455edbc4 HS |
288 | #ifdef CONFIG_IA32_EMULATION |
289 | #define is_ia32 test_thread_flag(TIF_IA32) | |
290 | #else | |
291 | #define is_ia32 0 | |
292 | #endif | |
293 | ||
1d13024e HS |
294 | static int |
295 | setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, | |
296 | sigset_t *set, struct pt_regs *regs) | |
297 | { | |
b94fd698 | 298 | int usig = signr_convert(sig); |
1d13024e HS |
299 | int ret; |
300 | ||
455edbc4 HS |
301 | /* Set up the stack frame */ |
302 | if (is_ia32) { | |
1d13024e | 303 | if (ka->sa.sa_flags & SA_SIGINFO) |
b94fd698 | 304 | ret = ia32_setup_rt_frame(usig, ka, info, set, regs); |
1d13024e | 305 | else |
b94fd698 | 306 | ret = ia32_setup_frame(usig, ka, set, regs); |
1d13024e | 307 | } else |
455edbc4 | 308 | ret = __setup_rt_frame(sig, ka, info, set, regs); |
1d13024e | 309 | |
3d0aedd9 HS |
310 | if (ret) { |
311 | force_sigsegv(sig, current); | |
312 | return -EFAULT; | |
313 | } | |
314 | ||
1d13024e HS |
315 | return ret; |
316 | } | |
1da177e4 | 317 | |
0928d6ef | 318 | static int |
1da177e4 | 319 | handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka, |
ac66f3fd | 320 | sigset_t *oldset, struct pt_regs *regs) |
1da177e4 | 321 | { |
0928d6ef RM |
322 | int ret; |
323 | ||
1da177e4 | 324 | /* Are we from a system call? */ |
4dfcbb99 | 325 | if (syscall_get_nr(current, regs) >= 0) { |
1da177e4 | 326 | /* If so, check system call restarting.. */ |
4dfcbb99 | 327 | switch (syscall_get_error(current, regs)) { |
ac66f3fd HH |
328 | case -ERESTART_RESTARTBLOCK: |
329 | case -ERESTARTNOHAND: | |
330 | regs->ax = -EINTR; | |
331 | break; | |
1da177e4 | 332 | |
ac66f3fd HH |
333 | case -ERESTARTSYS: |
334 | if (!(ka->sa.sa_flags & SA_RESTART)) { | |
335 | regs->ax = -EINTR; | |
1da177e4 | 336 | break; |
ac66f3fd HH |
337 | } |
338 | /* fallthrough */ | |
339 | case -ERESTARTNOINTR: | |
340 | regs->ax = regs->orig_ax; | |
341 | regs->ip -= 2; | |
342 | break; | |
1da177e4 LT |
343 | } |
344 | } | |
345 | ||
d61915da | 346 | /* |
e1f28773 RM |
347 | * If TF is set due to a debugger (TIF_FORCED_TF), clear the TF |
348 | * flag so that register information in the sigcontext is correct. | |
d61915da | 349 | */ |
65ea5b03 | 350 | if (unlikely(regs->flags & X86_EFLAGS_TF) && |
e1f28773 | 351 | likely(test_and_clear_thread_flag(TIF_FORCED_TF))) |
65ea5b03 | 352 | regs->flags &= ~X86_EFLAGS_TF; |
d61915da | 353 | |
0928d6ef | 354 | ret = setup_rt_frame(sig, ka, info, oldset, regs); |
1da177e4 | 355 | |
764e8d12 HS |
356 | if (ret) |
357 | return ret; | |
8b9c5ff3 | 358 | |
86d3237c | 359 | #ifdef CONFIG_X86_64 |
764e8d12 HS |
360 | /* |
361 | * This has nothing to do with segment registers, | |
362 | * despite the name. This magic affects uaccess.h | |
363 | * macros' behavior. Reset it to the normal setting. | |
364 | */ | |
365 | set_fs(USER_DS); | |
86d3237c | 366 | #endif |
36a03308 | 367 | |
764e8d12 HS |
368 | /* |
369 | * Clear the direction flag as per the ABI for function entry. | |
370 | */ | |
371 | regs->flags &= ~X86_EFLAGS_DF; | |
0928d6ef | 372 | |
764e8d12 HS |
373 | /* |
374 | * Clear TF when entering the signal handler, but | |
375 | * notify any tracer that was single-stepping it. | |
376 | * The tracer may want to single-step inside the | |
377 | * handler too. | |
378 | */ | |
379 | regs->flags &= ~X86_EFLAGS_TF; | |
380 | ||
381 | spin_lock_irq(¤t->sighand->siglock); | |
382 | sigorsets(¤t->blocked, ¤t->blocked, &ka->sa.sa_mask); | |
383 | if (!(ka->sa.sa_flags & SA_NODEFER)) | |
384 | sigaddset(¤t->blocked, sig); | |
385 | recalc_sigpending(); | |
386 | spin_unlock_irq(¤t->sighand->siglock); | |
387 | ||
388 | tracehook_signal_handler(sig, info, ka, regs, | |
389 | test_thread_flag(TIF_SINGLESTEP)); | |
390 | ||
391 | return 0; | |
1da177e4 LT |
392 | } |
393 | ||
8fcd8e20 HS |
394 | #define NR_restart_syscall \ |
395 | test_thread_flag(TIF_IA32) ? __NR_ia32_restart_syscall : __NR_restart_syscall | |
1da177e4 LT |
396 | /* |
397 | * Note that 'init' is a special process: it doesn't get signals it doesn't | |
398 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
399 | * mistake. | |
400 | */ | |
1d001df1 | 401 | static void do_signal(struct pt_regs *regs) |
1da177e4 LT |
402 | { |
403 | struct k_sigaction ka; | |
404 | siginfo_t info; | |
405 | int signr; | |
1d001df1 | 406 | sigset_t *oldset; |
1da177e4 LT |
407 | |
408 | /* | |
ac66f3fd HH |
409 | * We want the common case to go fast, which is why we may in certain |
410 | * cases get here from kernel mode. Just return without doing anything | |
1da177e4 | 411 | * if so. |
ac66f3fd HH |
412 | * X86_32: vm86 regs switched out by assembly code before reaching |
413 | * here, so testing against kernel CS suffices. | |
1da177e4 | 414 | */ |
76381fee | 415 | if (!user_mode(regs)) |
1d001df1 | 416 | return; |
1da177e4 | 417 | |
5a8da0ea | 418 | if (current_thread_info()->status & TS_RESTORE_SIGMASK) |
1d001df1 AK |
419 | oldset = ¤t->saved_sigmask; |
420 | else | |
1da177e4 LT |
421 | oldset = ¤t->blocked; |
422 | ||
423 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); | |
424 | if (signr > 0) { | |
5fd93330 HS |
425 | /* |
426 | * Re-enable any watchpoints before delivering the | |
1da177e4 LT |
427 | * signal to user space. The processor register will |
428 | * have been cleared if the watchpoint triggered | |
429 | * inside the kernel. | |
430 | */ | |
431 | if (current->thread.debugreg7) | |
e9129e56 | 432 | set_debugreg(current->thread.debugreg7, 7); |
1da177e4 | 433 | |
5fd93330 | 434 | /* Whee! Actually deliver the signal. */ |
1d001df1 | 435 | if (handle_signal(signr, &info, &ka, oldset, regs) == 0) { |
5a8da0ea RM |
436 | /* |
437 | * A signal was successfully delivered; the saved | |
1d001df1 AK |
438 | * sigmask will have been stored in the signal frame, |
439 | * and will be restored by sigreturn, so we can simply | |
5a8da0ea RM |
440 | * clear the TS_RESTORE_SIGMASK flag. |
441 | */ | |
442 | current_thread_info()->status &= ~TS_RESTORE_SIGMASK; | |
1d001df1 AK |
443 | } |
444 | return; | |
1da177e4 LT |
445 | } |
446 | ||
1da177e4 | 447 | /* Did we come from a system call? */ |
4dfcbb99 | 448 | if (syscall_get_nr(current, regs) >= 0) { |
1da177e4 | 449 | /* Restart the system call - no handlers present */ |
4dfcbb99 | 450 | switch (syscall_get_error(current, regs)) { |
1d001df1 AK |
451 | case -ERESTARTNOHAND: |
452 | case -ERESTARTSYS: | |
453 | case -ERESTARTNOINTR: | |
65ea5b03 PA |
454 | regs->ax = regs->orig_ax; |
455 | regs->ip -= 2; | |
1d001df1 | 456 | break; |
5fd93330 | 457 | |
1d001df1 | 458 | case -ERESTART_RESTARTBLOCK: |
8fcd8e20 | 459 | regs->ax = NR_restart_syscall; |
65ea5b03 | 460 | regs->ip -= 2; |
1d001df1 | 461 | break; |
1da177e4 LT |
462 | } |
463 | } | |
1d001df1 | 464 | |
ac66f3fd HH |
465 | /* |
466 | * If there's no signal to deliver, we just put the saved sigmask | |
467 | * back. | |
468 | */ | |
5a8da0ea RM |
469 | if (current_thread_info()->status & TS_RESTORE_SIGMASK) { |
470 | current_thread_info()->status &= ~TS_RESTORE_SIGMASK; | |
1d001df1 AK |
471 | sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); |
472 | } | |
1da177e4 LT |
473 | } |
474 | ||
ee847c54 HS |
475 | /* |
476 | * notification of userspace execution resumption | |
477 | * - triggered by the TIF_WORK_MASK flags | |
478 | */ | |
479 | void | |
480 | do_notify_resume(struct pt_regs *regs, void *unused, __u32 thread_info_flags) | |
1da177e4 | 481 | { |
ee847c54 | 482 | #if defined(CONFIG_X86_64) && defined(CONFIG_X86_MCE) |
e02e68d3 TH |
483 | /* notify userspace of pending MCEs */ |
484 | if (thread_info_flags & _TIF_MCE_NOTIFY) | |
485 | mce_notify_user(); | |
ee847c54 | 486 | #endif /* CONFIG_X86_64 && CONFIG_X86_MCE */ |
e02e68d3 | 487 | |
1da177e4 | 488 | /* deal with pending signal delivery */ |
5a8da0ea | 489 | if (thread_info_flags & _TIF_SIGPENDING) |
1d001df1 | 490 | do_signal(regs); |
59e52130 RM |
491 | |
492 | if (thread_info_flags & _TIF_NOTIFY_RESUME) { | |
493 | clear_thread_flag(TIF_NOTIFY_RESUME); | |
494 | tracehook_notify_resume(regs); | |
495 | } | |
ee847c54 HS |
496 | |
497 | #ifdef CONFIG_X86_32 | |
498 | clear_thread_flag(TIF_IRET); | |
499 | #endif /* CONFIG_X86_32 */ | |
1da177e4 LT |
500 | } |
501 | ||
502 | void signal_fault(struct pt_regs *regs, void __user *frame, char *where) | |
caa007dd GP |
503 | { |
504 | struct task_struct *me = current; | |
b2994ef0 | 505 | |
03252919 | 506 | if (show_unhandled_signals && printk_ratelimit()) { |
b2994ef0 HS |
507 | printk(KERN_INFO |
508 | "%s[%d] bad frame in %s frame:%p ip:%lx sp:%lx orax:%lx", | |
509 | me->comm, me->pid, where, frame, | |
510 | regs->ip, regs->sp, regs->orig_ax); | |
03252919 | 511 | print_vma_addr(" in ", regs->ip); |
b2994ef0 | 512 | printk(KERN_CONT "\n"); |
03252919 | 513 | } |
1da177e4 | 514 | |
caa007dd GP |
515 | force_sig(SIGSEGV, me); |
516 | } |