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 | ||
709110bd HS |
79 | #ifdef CONFIG_X86_32 |
80 | GET_SEG(gs); | |
81 | COPY_SEG(fs); | |
82 | COPY_SEG(es); | |
83 | COPY_SEG(ds); | |
84 | #endif /* CONFIG_X86_32 */ | |
85 | ||
742fa54a PA |
86 | COPY(di); COPY(si); COPY(bp); COPY(sp); COPY(bx); |
87 | COPY(dx); COPY(cx); COPY(ip); | |
709110bd HS |
88 | |
89 | #ifdef CONFIG_X86_64 | |
1da177e4 LT |
90 | COPY(r8); |
91 | COPY(r9); | |
92 | COPY(r10); | |
93 | COPY(r11); | |
94 | COPY(r12); | |
95 | COPY(r13); | |
96 | COPY(r14); | |
97 | COPY(r15); | |
709110bd | 98 | #endif /* CONFIG_X86_64 */ |
1da177e4 | 99 | |
709110bd HS |
100 | #ifdef CONFIG_X86_32 |
101 | COPY_SEG_STRICT(cs); | |
102 | COPY_SEG_STRICT(ss); | |
103 | #else /* !CONFIG_X86_32 */ | |
e4e5d324 BF |
104 | /* Kernel saves and restores only the CS segment register on signals, |
105 | * which is the bare minimum needed to allow mixed 32/64-bit code. | |
106 | * App's signal handler can save/restore other segments if needed. */ | |
a2e8d3dc | 107 | COPY_SEG_STRICT(cs); |
709110bd | 108 | #endif /* CONFIG_X86_32 */ |
e4e5d324 | 109 | |
69e13ad5 HS |
110 | err |= __get_user(tmpflags, &sc->flags); |
111 | regs->flags = (regs->flags & ~FIX_EFLAGS) | (tmpflags & FIX_EFLAGS); | |
112 | regs->orig_ax = -1; /* disable syscall checks */ | |
1da177e4 | 113 | |
69e13ad5 HS |
114 | err |= __get_user(buf, &sc->fpstate); |
115 | err |= restore_i387_xstate(buf); | |
1da177e4 | 116 | |
866bc13f | 117 | err |= __get_user(*pax, &sc->ax); |
1da177e4 | 118 | return err; |
1da177e4 LT |
119 | } |
120 | ||
e6babb6b | 121 | static long do_rt_sigreturn(struct pt_regs *regs) |
1da177e4 LT |
122 | { |
123 | struct rt_sigframe __user *frame; | |
65ea5b03 | 124 | unsigned long ax; |
e6babb6b | 125 | sigset_t set; |
1da177e4 | 126 | |
2d19c458 HH |
127 | frame = (struct rt_sigframe __user *)(regs->sp - sizeof(long)); |
128 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
1da177e4 | 129 | goto badframe; |
2d19c458 | 130 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) |
1da177e4 | 131 | goto badframe; |
1da177e4 LT |
132 | |
133 | sigdelsetmask(&set, ~_BLOCKABLE); | |
134 | spin_lock_irq(¤t->sighand->siglock); | |
135 | current->blocked = set; | |
136 | recalc_sigpending(); | |
137 | spin_unlock_irq(¤t->sighand->siglock); | |
caa007dd | 138 | |
65ea5b03 | 139 | if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &ax)) |
1da177e4 LT |
140 | goto badframe; |
141 | ||
65ea5b03 | 142 | if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->sp) == -EFAULT) |
1da177e4 LT |
143 | goto badframe; |
144 | ||
65ea5b03 | 145 | return ax; |
1da177e4 LT |
146 | |
147 | badframe: | |
e6babb6b | 148 | signal_fault(regs, frame, "rt_sigreturn"); |
1da177e4 | 149 | return 0; |
caa007dd | 150 | } |
1da177e4 | 151 | |
e6babb6b HS |
152 | asmlinkage long sys_rt_sigreturn(struct pt_regs *regs) |
153 | { | |
154 | return do_rt_sigreturn(regs); | |
155 | } | |
156 | ||
1da177e4 LT |
157 | /* |
158 | * Set up a signal frame. | |
159 | */ | |
15002fa9 | 160 | static int |
ee7d523c | 161 | setup_sigcontext(struct sigcontext __user *sc, void __user *fpstate, |
8735b7d0 | 162 | struct pt_regs *regs, unsigned long mask) |
1da177e4 LT |
163 | { |
164 | int err = 0; | |
1da177e4 | 165 | |
15002fa9 HS |
166 | #ifdef CONFIG_X86_32 |
167 | { | |
168 | unsigned int tmp; | |
169 | ||
170 | savesegment(gs, tmp); | |
171 | err |= __put_user(tmp, (unsigned int __user *)&sc->gs); | |
172 | } | |
173 | err |= __put_user(regs->fs, (unsigned int __user *)&sc->fs); | |
174 | err |= __put_user(regs->es, (unsigned int __user *)&sc->es); | |
175 | err |= __put_user(regs->ds, (unsigned int __user *)&sc->ds); | |
176 | #endif /* CONFIG_X86_32 */ | |
1da177e4 | 177 | |
742fa54a PA |
178 | err |= __put_user(regs->di, &sc->di); |
179 | err |= __put_user(regs->si, &sc->si); | |
180 | err |= __put_user(regs->bp, &sc->bp); | |
181 | err |= __put_user(regs->sp, &sc->sp); | |
182 | err |= __put_user(regs->bx, &sc->bx); | |
183 | err |= __put_user(regs->dx, &sc->dx); | |
184 | err |= __put_user(regs->cx, &sc->cx); | |
185 | err |= __put_user(regs->ax, &sc->ax); | |
15002fa9 | 186 | #ifdef CONFIG_X86_64 |
1da177e4 LT |
187 | err |= __put_user(regs->r8, &sc->r8); |
188 | err |= __put_user(regs->r9, &sc->r9); | |
189 | err |= __put_user(regs->r10, &sc->r10); | |
190 | err |= __put_user(regs->r11, &sc->r11); | |
191 | err |= __put_user(regs->r12, &sc->r12); | |
192 | err |= __put_user(regs->r13, &sc->r13); | |
193 | err |= __put_user(regs->r14, &sc->r14); | |
194 | err |= __put_user(regs->r15, &sc->r15); | |
15002fa9 HS |
195 | #endif /* CONFIG_X86_64 */ |
196 | ||
8735b7d0 HS |
197 | err |= __put_user(current->thread.trap_no, &sc->trapno); |
198 | err |= __put_user(current->thread.error_code, &sc->err); | |
742fa54a | 199 | err |= __put_user(regs->ip, &sc->ip); |
15002fa9 HS |
200 | #ifdef CONFIG_X86_32 |
201 | err |= __put_user(regs->cs, (unsigned int __user *)&sc->cs); | |
202 | err |= __put_user(regs->flags, &sc->flags); | |
203 | err |= __put_user(regs->sp, &sc->sp_at_signal); | |
204 | err |= __put_user(regs->ss, (unsigned int __user *)&sc->ss); | |
205 | #else /* !CONFIG_X86_32 */ | |
742fa54a | 206 | err |= __put_user(regs->flags, &sc->flags); |
15002fa9 HS |
207 | err |= __put_user(regs->cs, &sc->cs); |
208 | err |= __put_user(0, &sc->gs); | |
209 | err |= __put_user(0, &sc->fs); | |
210 | #endif /* CONFIG_X86_32 */ | |
211 | ||
ee7d523c | 212 | err |= __put_user(fpstate, &sc->fpstate); |
15002fa9 HS |
213 | |
214 | /* non-iBCS2 extensions.. */ | |
1da177e4 | 215 | err |= __put_user(mask, &sc->oldmask); |
8735b7d0 | 216 | err |= __put_user(current->thread.cr2, &sc->cr2); |
1da177e4 LT |
217 | |
218 | return err; | |
219 | } | |
220 | ||
221 | /* | |
222 | * Determine which stack to use.. | |
223 | */ | |
224 | ||
225 | static void __user * | |
fd4a2030 | 226 | get_stack(struct k_sigaction *ka, unsigned long sp, unsigned long size) |
1da177e4 | 227 | { |
1da177e4 | 228 | /* Default to using normal stack - redzone*/ |
fd4a2030 | 229 | sp -= 128; |
1da177e4 LT |
230 | |
231 | /* This is the X/Open sanctioned signal stack switching. */ | |
1da177e4 | 232 | if (ka->sa.sa_flags & SA_ONSTACK) { |
65ea5b03 PA |
233 | if (sas_ss_flags(sp) == 0) |
234 | sp = current->sas_ss_sp + current->sas_ss_size; | |
1da177e4 LT |
235 | } |
236 | ||
c37b5efe | 237 | return (void __user *)round_down(sp - size, 64); |
1da177e4 LT |
238 | } |
239 | ||
1d13024e HS |
240 | static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, |
241 | sigset_t *set, struct pt_regs *regs) | |
1da177e4 LT |
242 | { |
243 | struct rt_sigframe __user *frame; | |
ab513701 | 244 | void __user *fp = NULL; |
1da177e4 LT |
245 | int err = 0; |
246 | struct task_struct *me = current; | |
247 | ||
248 | if (used_math()) { | |
fd4a2030 | 249 | fp = get_stack(ka, regs->sp, sig_xstate_size); |
1da177e4 LT |
250 | frame = (void __user *)round_down( |
251 | (unsigned long)fp - sizeof(struct rt_sigframe), 16) - 8; | |
252 | ||
ab513701 | 253 | if (save_i387_xstate(fp) < 0) |
2ba48e16 | 254 | return -EFAULT; |
1da177e4 | 255 | } else |
fd4a2030 | 256 | frame = get_stack(ka, regs->sp, sizeof(struct rt_sigframe)) - 8; |
1da177e4 LT |
257 | |
258 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
3d0aedd9 | 259 | return -EFAULT; |
1da177e4 | 260 | |
caa007dd | 261 | if (ka->sa.sa_flags & SA_SIGINFO) { |
2ba48e16 | 262 | if (copy_siginfo_to_user(&frame->info, info)) |
3d0aedd9 | 263 | return -EFAULT; |
1da177e4 | 264 | } |
caa007dd | 265 | |
1da177e4 | 266 | /* Create the ucontext. */ |
c37b5efe SS |
267 | if (cpu_has_xsave) |
268 | err |= __put_user(UC_FP_XSTATE, &frame->uc.uc_flags); | |
269 | else | |
270 | err |= __put_user(0, &frame->uc.uc_flags); | |
1da177e4 LT |
271 | err |= __put_user(0, &frame->uc.uc_link); |
272 | err |= __put_user(me->sas_ss_sp, &frame->uc.uc_stack.ss_sp); | |
65ea5b03 | 273 | err |= __put_user(sas_ss_flags(regs->sp), |
1da177e4 LT |
274 | &frame->uc.uc_stack.ss_flags); |
275 | err |= __put_user(me->sas_ss_size, &frame->uc.uc_stack.ss_size); | |
8735b7d0 | 276 | err |= setup_sigcontext(&frame->uc.uc_mcontext, fp, regs, set->sig[0]); |
124ffe14 | 277 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); |
1da177e4 LT |
278 | |
279 | /* Set up to return from userspace. If provided, use a stub | |
280 | already in userspace. */ | |
281 | /* x86-64 should always use SA_RESTORER. */ | |
282 | if (ka->sa.sa_flags & SA_RESTORER) { | |
283 | err |= __put_user(ka->sa.sa_restorer, &frame->pretcode); | |
284 | } else { | |
285 | /* could use a vstub here */ | |
3d0aedd9 | 286 | return -EFAULT; |
1da177e4 LT |
287 | } |
288 | ||
289 | if (err) | |
3d0aedd9 | 290 | return -EFAULT; |
1da177e4 | 291 | |
1da177e4 | 292 | /* Set up registers for signal handler */ |
65ea5b03 | 293 | regs->di = sig; |
caa007dd | 294 | /* In case the signal handler was declared without prototypes */ |
65ea5b03 | 295 | regs->ax = 0; |
1da177e4 LT |
296 | |
297 | /* This also works for non SA_SIGINFO handlers because they expect the | |
298 | next argument after the signal number on the stack. */ | |
65ea5b03 PA |
299 | regs->si = (unsigned long)&frame->info; |
300 | regs->dx = (unsigned long)&frame->uc; | |
301 | regs->ip = (unsigned long) ka->sa.sa_handler; | |
1da177e4 | 302 | |
65ea5b03 | 303 | regs->sp = (unsigned long)frame; |
1da177e4 | 304 | |
e4e5d324 BF |
305 | /* Set up the CS register to run signal handlers in 64-bit mode, |
306 | even if the handler happens to be interrupting 32-bit code. */ | |
307 | regs->cs = __USER_CS; | |
308 | ||
1d001df1 | 309 | return 0; |
1da177e4 LT |
310 | } |
311 | ||
312 | /* | |
313 | * OK, we're invoking a handler | |
caa007dd | 314 | */ |
b94fd698 HS |
315 | static int signr_convert(int sig) |
316 | { | |
96bf84b7 HS |
317 | #ifdef CONFIG_X86_32 |
318 | struct thread_info *info = current_thread_info(); | |
319 | ||
320 | if (info->exec_domain && info->exec_domain->signal_invmap && sig < 32) | |
321 | return info->exec_domain->signal_invmap[sig]; | |
322 | #endif /* CONFIG_X86_32 */ | |
b94fd698 HS |
323 | return sig; |
324 | } | |
325 | ||
cabf5035 HS |
326 | #ifdef CONFIG_X86_32 |
327 | ||
328 | #define is_ia32 1 | |
329 | #define ia32_setup_frame __setup_frame | |
330 | #define ia32_setup_rt_frame __setup_rt_frame | |
331 | ||
332 | #else /* !CONFIG_X86_32 */ | |
333 | ||
455edbc4 HS |
334 | #ifdef CONFIG_IA32_EMULATION |
335 | #define is_ia32 test_thread_flag(TIF_IA32) | |
cabf5035 | 336 | #else /* !CONFIG_IA32_EMULATION */ |
455edbc4 | 337 | #define is_ia32 0 |
cabf5035 HS |
338 | #endif /* CONFIG_IA32_EMULATION */ |
339 | ||
340 | #endif /* CONFIG_X86_32 */ | |
455edbc4 | 341 | |
1d13024e HS |
342 | static int |
343 | setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, | |
344 | sigset_t *set, struct pt_regs *regs) | |
345 | { | |
b94fd698 | 346 | int usig = signr_convert(sig); |
1d13024e HS |
347 | int ret; |
348 | ||
455edbc4 HS |
349 | /* Set up the stack frame */ |
350 | if (is_ia32) { | |
1d13024e | 351 | if (ka->sa.sa_flags & SA_SIGINFO) |
b94fd698 | 352 | ret = ia32_setup_rt_frame(usig, ka, info, set, regs); |
1d13024e | 353 | else |
b94fd698 | 354 | ret = ia32_setup_frame(usig, ka, set, regs); |
1d13024e | 355 | } else |
455edbc4 | 356 | ret = __setup_rt_frame(sig, ka, info, set, regs); |
1d13024e | 357 | |
3d0aedd9 HS |
358 | if (ret) { |
359 | force_sigsegv(sig, current); | |
360 | return -EFAULT; | |
361 | } | |
362 | ||
1d13024e HS |
363 | return ret; |
364 | } | |
1da177e4 | 365 | |
0928d6ef | 366 | static int |
1da177e4 | 367 | handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka, |
ac66f3fd | 368 | sigset_t *oldset, struct pt_regs *regs) |
1da177e4 | 369 | { |
0928d6ef RM |
370 | int ret; |
371 | ||
1da177e4 | 372 | /* Are we from a system call? */ |
4dfcbb99 | 373 | if (syscall_get_nr(current, regs) >= 0) { |
1da177e4 | 374 | /* If so, check system call restarting.. */ |
4dfcbb99 | 375 | switch (syscall_get_error(current, regs)) { |
ac66f3fd HH |
376 | case -ERESTART_RESTARTBLOCK: |
377 | case -ERESTARTNOHAND: | |
378 | regs->ax = -EINTR; | |
379 | break; | |
1da177e4 | 380 | |
ac66f3fd HH |
381 | case -ERESTARTSYS: |
382 | if (!(ka->sa.sa_flags & SA_RESTART)) { | |
383 | regs->ax = -EINTR; | |
1da177e4 | 384 | break; |
ac66f3fd HH |
385 | } |
386 | /* fallthrough */ | |
387 | case -ERESTARTNOINTR: | |
388 | regs->ax = regs->orig_ax; | |
389 | regs->ip -= 2; | |
390 | break; | |
1da177e4 LT |
391 | } |
392 | } | |
393 | ||
d61915da | 394 | /* |
e1f28773 RM |
395 | * If TF is set due to a debugger (TIF_FORCED_TF), clear the TF |
396 | * flag so that register information in the sigcontext is correct. | |
d61915da | 397 | */ |
65ea5b03 | 398 | if (unlikely(regs->flags & X86_EFLAGS_TF) && |
e1f28773 | 399 | likely(test_and_clear_thread_flag(TIF_FORCED_TF))) |
65ea5b03 | 400 | regs->flags &= ~X86_EFLAGS_TF; |
d61915da | 401 | |
0928d6ef | 402 | ret = setup_rt_frame(sig, ka, info, oldset, regs); |
1da177e4 | 403 | |
764e8d12 HS |
404 | if (ret) |
405 | return ret; | |
8b9c5ff3 | 406 | |
86d3237c | 407 | #ifdef CONFIG_X86_64 |
764e8d12 HS |
408 | /* |
409 | * This has nothing to do with segment registers, | |
410 | * despite the name. This magic affects uaccess.h | |
411 | * macros' behavior. Reset it to the normal setting. | |
412 | */ | |
413 | set_fs(USER_DS); | |
86d3237c | 414 | #endif |
36a03308 | 415 | |
764e8d12 HS |
416 | /* |
417 | * Clear the direction flag as per the ABI for function entry. | |
418 | */ | |
419 | regs->flags &= ~X86_EFLAGS_DF; | |
0928d6ef | 420 | |
764e8d12 HS |
421 | /* |
422 | * Clear TF when entering the signal handler, but | |
423 | * notify any tracer that was single-stepping it. | |
424 | * The tracer may want to single-step inside the | |
425 | * handler too. | |
426 | */ | |
427 | regs->flags &= ~X86_EFLAGS_TF; | |
428 | ||
429 | spin_lock_irq(¤t->sighand->siglock); | |
430 | sigorsets(¤t->blocked, ¤t->blocked, &ka->sa.sa_mask); | |
431 | if (!(ka->sa.sa_flags & SA_NODEFER)) | |
432 | sigaddset(¤t->blocked, sig); | |
433 | recalc_sigpending(); | |
434 | spin_unlock_irq(¤t->sighand->siglock); | |
435 | ||
436 | tracehook_signal_handler(sig, info, ka, regs, | |
437 | test_thread_flag(TIF_SINGLESTEP)); | |
438 | ||
439 | return 0; | |
1da177e4 LT |
440 | } |
441 | ||
57917752 HS |
442 | #ifdef CONFIG_X86_32 |
443 | #define NR_restart_syscall __NR_restart_syscall | |
444 | #else /* !CONFIG_X86_32 */ | |
8fcd8e20 HS |
445 | #define NR_restart_syscall \ |
446 | test_thread_flag(TIF_IA32) ? __NR_ia32_restart_syscall : __NR_restart_syscall | |
57917752 HS |
447 | #endif /* CONFIG_X86_32 */ |
448 | ||
1da177e4 LT |
449 | /* |
450 | * Note that 'init' is a special process: it doesn't get signals it doesn't | |
451 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
452 | * mistake. | |
453 | */ | |
1d001df1 | 454 | static void do_signal(struct pt_regs *regs) |
1da177e4 LT |
455 | { |
456 | struct k_sigaction ka; | |
457 | siginfo_t info; | |
458 | int signr; | |
1d001df1 | 459 | sigset_t *oldset; |
1da177e4 LT |
460 | |
461 | /* | |
ac66f3fd HH |
462 | * We want the common case to go fast, which is why we may in certain |
463 | * cases get here from kernel mode. Just return without doing anything | |
1da177e4 | 464 | * if so. |
ac66f3fd HH |
465 | * X86_32: vm86 regs switched out by assembly code before reaching |
466 | * here, so testing against kernel CS suffices. | |
1da177e4 | 467 | */ |
76381fee | 468 | if (!user_mode(regs)) |
1d001df1 | 469 | return; |
1da177e4 | 470 | |
5a8da0ea | 471 | if (current_thread_info()->status & TS_RESTORE_SIGMASK) |
1d001df1 AK |
472 | oldset = ¤t->saved_sigmask; |
473 | else | |
1da177e4 LT |
474 | oldset = ¤t->blocked; |
475 | ||
476 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); | |
477 | if (signr > 0) { | |
5fd93330 HS |
478 | /* |
479 | * Re-enable any watchpoints before delivering the | |
1da177e4 LT |
480 | * signal to user space. The processor register will |
481 | * have been cleared if the watchpoint triggered | |
482 | * inside the kernel. | |
483 | */ | |
484 | if (current->thread.debugreg7) | |
e9129e56 | 485 | set_debugreg(current->thread.debugreg7, 7); |
1da177e4 | 486 | |
5fd93330 | 487 | /* Whee! Actually deliver the signal. */ |
1d001df1 | 488 | if (handle_signal(signr, &info, &ka, oldset, regs) == 0) { |
5a8da0ea RM |
489 | /* |
490 | * A signal was successfully delivered; the saved | |
1d001df1 AK |
491 | * sigmask will have been stored in the signal frame, |
492 | * and will be restored by sigreturn, so we can simply | |
5a8da0ea RM |
493 | * clear the TS_RESTORE_SIGMASK flag. |
494 | */ | |
495 | current_thread_info()->status &= ~TS_RESTORE_SIGMASK; | |
1d001df1 AK |
496 | } |
497 | return; | |
1da177e4 LT |
498 | } |
499 | ||
1da177e4 | 500 | /* Did we come from a system call? */ |
4dfcbb99 | 501 | if (syscall_get_nr(current, regs) >= 0) { |
1da177e4 | 502 | /* Restart the system call - no handlers present */ |
4dfcbb99 | 503 | switch (syscall_get_error(current, regs)) { |
1d001df1 AK |
504 | case -ERESTARTNOHAND: |
505 | case -ERESTARTSYS: | |
506 | case -ERESTARTNOINTR: | |
65ea5b03 PA |
507 | regs->ax = regs->orig_ax; |
508 | regs->ip -= 2; | |
1d001df1 | 509 | break; |
5fd93330 | 510 | |
1d001df1 | 511 | case -ERESTART_RESTARTBLOCK: |
8fcd8e20 | 512 | regs->ax = NR_restart_syscall; |
65ea5b03 | 513 | regs->ip -= 2; |
1d001df1 | 514 | break; |
1da177e4 LT |
515 | } |
516 | } | |
1d001df1 | 517 | |
ac66f3fd HH |
518 | /* |
519 | * If there's no signal to deliver, we just put the saved sigmask | |
520 | * back. | |
521 | */ | |
5a8da0ea RM |
522 | if (current_thread_info()->status & TS_RESTORE_SIGMASK) { |
523 | current_thread_info()->status &= ~TS_RESTORE_SIGMASK; | |
1d001df1 AK |
524 | sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); |
525 | } | |
1da177e4 LT |
526 | } |
527 | ||
ee847c54 HS |
528 | /* |
529 | * notification of userspace execution resumption | |
530 | * - triggered by the TIF_WORK_MASK flags | |
531 | */ | |
532 | void | |
533 | do_notify_resume(struct pt_regs *regs, void *unused, __u32 thread_info_flags) | |
1da177e4 | 534 | { |
ee847c54 | 535 | #if defined(CONFIG_X86_64) && defined(CONFIG_X86_MCE) |
e02e68d3 TH |
536 | /* notify userspace of pending MCEs */ |
537 | if (thread_info_flags & _TIF_MCE_NOTIFY) | |
538 | mce_notify_user(); | |
ee847c54 | 539 | #endif /* CONFIG_X86_64 && CONFIG_X86_MCE */ |
e02e68d3 | 540 | |
1da177e4 | 541 | /* deal with pending signal delivery */ |
5a8da0ea | 542 | if (thread_info_flags & _TIF_SIGPENDING) |
1d001df1 | 543 | do_signal(regs); |
59e52130 RM |
544 | |
545 | if (thread_info_flags & _TIF_NOTIFY_RESUME) { | |
546 | clear_thread_flag(TIF_NOTIFY_RESUME); | |
547 | tracehook_notify_resume(regs); | |
548 | } | |
ee847c54 HS |
549 | |
550 | #ifdef CONFIG_X86_32 | |
551 | clear_thread_flag(TIF_IRET); | |
552 | #endif /* CONFIG_X86_32 */ | |
1da177e4 LT |
553 | } |
554 | ||
555 | void signal_fault(struct pt_regs *regs, void __user *frame, char *where) | |
caa007dd GP |
556 | { |
557 | struct task_struct *me = current; | |
b2994ef0 | 558 | |
03252919 | 559 | if (show_unhandled_signals && printk_ratelimit()) { |
b2994ef0 HS |
560 | printk(KERN_INFO |
561 | "%s[%d] bad frame in %s frame:%p ip:%lx sp:%lx orax:%lx", | |
562 | me->comm, me->pid, where, frame, | |
563 | regs->ip, regs->sp, regs->orig_ax); | |
03252919 | 564 | print_vma_addr(" in ", regs->ip); |
b2994ef0 | 565 | printk(KERN_CONT "\n"); |
03252919 | 566 | } |
1da177e4 | 567 | |
caa007dd GP |
568 | force_sig(SIGSEGV, me); |
569 | } |