Commit | Line | Data |
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1da177e4 | 1 | /* |
a23ba435 | 2 | * arch/sh/kernel/signal_64.c |
1da177e4 LT |
3 | * |
4 | * Copyright (C) 2000, 2001 Paolo Alberelli | |
6ac03437 | 5 | * Copyright (C) 2003 - 2008 Paul Mundt |
1da177e4 LT |
6 | * Copyright (C) 2004 Richard Curnow |
7 | * | |
a23ba435 PM |
8 | * This file is subject to the terms and conditions of the GNU General Public |
9 | * License. See the file "COPYING" in the main directory of this archive | |
10 | * for more details. | |
1da177e4 LT |
11 | */ |
12 | #include <linux/rwsem.h> | |
13 | #include <linux/sched.h> | |
14 | #include <linux/mm.h> | |
15 | #include <linux/smp.h> | |
1da177e4 LT |
16 | #include <linux/kernel.h> |
17 | #include <linux/signal.h> | |
18 | #include <linux/errno.h> | |
19 | #include <linux/wait.h> | |
20 | #include <linux/personality.h> | |
7dfb7103 | 21 | #include <linux/freezer.h> |
1da177e4 LT |
22 | #include <linux/ptrace.h> |
23 | #include <linux/unistd.h> | |
24 | #include <linux/stddef.h> | |
ab99c733 | 25 | #include <linux/tracehook.h> |
1da177e4 LT |
26 | #include <asm/ucontext.h> |
27 | #include <asm/uaccess.h> | |
28 | #include <asm/pgtable.h> | |
f7a7b153 | 29 | #include <asm/cacheflush.h> |
50387b3e | 30 | #include <asm/fpu.h> |
1da177e4 LT |
31 | |
32 | #define REG_RET 9 | |
33 | #define REG_ARG1 2 | |
34 | #define REG_ARG2 3 | |
35 | #define REG_ARG3 4 | |
36 | #define REG_SP 15 | |
37 | #define REG_PR 18 | |
38 | #define REF_REG_RET regs->regs[REG_RET] | |
39 | #define REF_REG_SP regs->regs[REG_SP] | |
40 | #define DEREF_REG_PR regs->regs[REG_PR] | |
41 | ||
42 | #define DEBUG_SIG 0 | |
43 | ||
44 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) | |
45 | ||
6ac03437 | 46 | static int |
8a80a5e9 PM |
47 | handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka, |
48 | sigset_t *oldset, struct pt_regs * regs); | |
49 | ||
94e2fb3d PM |
50 | static inline void |
51 | handle_syscall_restart(struct pt_regs *regs, struct sigaction *sa) | |
52 | { | |
53 | /* If we're not from a syscall, bail out */ | |
54 | if (regs->syscall_nr < 0) | |
55 | return; | |
56 | ||
57 | /* check for system call restart.. */ | |
58 | switch (regs->regs[REG_RET]) { | |
59 | case -ERESTART_RESTARTBLOCK: | |
60 | case -ERESTARTNOHAND: | |
61 | no_system_call_restart: | |
62 | regs->regs[REG_RET] = -EINTR; | |
94e2fb3d PM |
63 | break; |
64 | ||
65 | case -ERESTARTSYS: | |
66 | if (!(sa->sa_flags & SA_RESTART)) | |
67 | goto no_system_call_restart; | |
68 | /* fallthrough */ | |
69 | case -ERESTARTNOINTR: | |
70 | /* Decode syscall # */ | |
71 | regs->regs[REG_RET] = regs->syscall_nr; | |
72 | regs->pc -= 4; | |
73 | break; | |
74 | } | |
75 | } | |
76 | ||
ab99c733 PM |
77 | /* |
78 | * Note that 'init' is a special process: it doesn't get signals it doesn't | |
79 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
80 | * mistake. | |
81 | * | |
82 | * Note that we go through the signals twice: once to check the signals that | |
83 | * the kernel can handle, and then we build all the user-level signal handling | |
84 | * stack-frames in one go after that. | |
85 | */ | |
86 | static int do_signal(struct pt_regs *regs, sigset_t *oldset) | |
87 | { | |
88 | siginfo_t info; | |
89 | int signr; | |
90 | struct k_sigaction ka; | |
91 | ||
92 | /* | |
93 | * We want the common case to go fast, which | |
94 | * is why we may in certain cases get here from | |
95 | * kernel mode. Just return without doing anything | |
96 | * if so. | |
97 | */ | |
98 | if (!user_mode(regs)) | |
99 | return 1; | |
100 | ||
101 | if (try_to_freeze()) | |
102 | goto no_signal; | |
103 | ||
104 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) | |
105 | oldset = ¤t->saved_sigmask; | |
106 | else if (!oldset) | |
107 | oldset = ¤t->blocked; | |
108 | ||
109 | signr = get_signal_to_deliver(&info, &ka, regs, 0); | |
ab99c733 | 110 | if (signr > 0) { |
03f07876 | 111 | handle_syscall_restart(regs, &ka.sa); |
94e2fb3d | 112 | |
ab99c733 | 113 | /* Whee! Actually deliver the signal. */ |
6ac03437 PM |
114 | if (handle_signal(signr, &info, &ka, oldset, regs) == 0) { |
115 | /* | |
116 | * If a signal was successfully delivered, the | |
117 | * saved sigmask is in its frame, and we can | |
118 | * clear the TIF_RESTORE_SIGMASK flag. | |
119 | */ | |
120 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) | |
121 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
122 | ||
123 | tracehook_signal_handler(signr, &info, &ka, regs, 0); | |
124 | return 1; | |
125 | } | |
ab99c733 PM |
126 | } |
127 | ||
128 | no_signal: | |
129 | /* Did we come from a system call? */ | |
130 | if (regs->syscall_nr >= 0) { | |
131 | /* Restart the system call - no handlers present */ | |
132 | switch (regs->regs[REG_RET]) { | |
133 | case -ERESTARTNOHAND: | |
134 | case -ERESTARTSYS: | |
135 | case -ERESTARTNOINTR: | |
136 | /* Decode Syscall # */ | |
137 | regs->regs[REG_RET] = regs->syscall_nr; | |
138 | regs->pc -= 4; | |
139 | break; | |
140 | ||
141 | case -ERESTART_RESTARTBLOCK: | |
142 | regs->regs[REG_RET] = __NR_restart_syscall; | |
143 | regs->pc -= 4; | |
144 | break; | |
145 | } | |
146 | } | |
147 | ||
148 | /* No signal to deliver -- put the saved sigmask back */ | |
149 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) { | |
150 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
151 | sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); | |
152 | } | |
153 | ||
154 | return 0; | |
155 | } | |
1da177e4 LT |
156 | |
157 | /* | |
158 | * Atomically swap in the new signal mask, and wait for a signal. | |
159 | */ | |
1da177e4 LT |
160 | asmlinkage int |
161 | sys_sigsuspend(old_sigset_t mask, | |
162 | unsigned long r3, unsigned long r4, unsigned long r5, | |
163 | unsigned long r6, unsigned long r7, | |
164 | struct pt_regs * regs) | |
165 | { | |
166 | sigset_t saveset; | |
167 | ||
168 | mask &= _BLOCKABLE; | |
169 | spin_lock_irq(¤t->sighand->siglock); | |
170 | saveset = current->blocked; | |
171 | siginitset(¤t->blocked, mask); | |
172 | recalc_sigpending(); | |
173 | spin_unlock_irq(¤t->sighand->siglock); | |
174 | ||
175 | REF_REG_RET = -EINTR; | |
176 | while (1) { | |
177 | current->state = TASK_INTERRUPTIBLE; | |
178 | schedule(); | |
179 | regs->pc += 4; /* because sys_sigreturn decrements the pc */ | |
180 | if (do_signal(regs, &saveset)) { | |
181 | /* pc now points at signal handler. Need to decrement | |
182 | it because entry.S will increment it. */ | |
183 | regs->pc -= 4; | |
184 | return -EINTR; | |
185 | } | |
186 | } | |
187 | } | |
188 | ||
189 | asmlinkage int | |
190 | sys_rt_sigsuspend(sigset_t *unewset, size_t sigsetsize, | |
191 | unsigned long r4, unsigned long r5, unsigned long r6, | |
192 | unsigned long r7, | |
193 | struct pt_regs * regs) | |
194 | { | |
195 | sigset_t saveset, newset; | |
196 | ||
197 | /* XXX: Don't preclude handling different sized sigset_t's. */ | |
198 | if (sigsetsize != sizeof(sigset_t)) | |
199 | return -EINVAL; | |
200 | ||
201 | if (copy_from_user(&newset, unewset, sizeof(newset))) | |
202 | return -EFAULT; | |
203 | sigdelsetmask(&newset, ~_BLOCKABLE); | |
204 | spin_lock_irq(¤t->sighand->siglock); | |
205 | saveset = current->blocked; | |
206 | current->blocked = newset; | |
207 | recalc_sigpending(); | |
208 | spin_unlock_irq(¤t->sighand->siglock); | |
209 | ||
210 | REF_REG_RET = -EINTR; | |
211 | while (1) { | |
212 | current->state = TASK_INTERRUPTIBLE; | |
213 | schedule(); | |
214 | regs->pc += 4; /* because sys_sigreturn decrements the pc */ | |
215 | if (do_signal(regs, &saveset)) { | |
216 | /* pc now points at signal handler. Need to decrement | |
217 | it because entry.S will increment it. */ | |
218 | regs->pc -= 4; | |
219 | return -EINTR; | |
220 | } | |
221 | } | |
222 | } | |
223 | ||
224 | asmlinkage int | |
225 | sys_sigaction(int sig, const struct old_sigaction __user *act, | |
226 | struct old_sigaction __user *oact) | |
227 | { | |
228 | struct k_sigaction new_ka, old_ka; | |
229 | int ret; | |
230 | ||
231 | if (act) { | |
232 | old_sigset_t mask; | |
233 | if (!access_ok(VERIFY_READ, act, sizeof(*act)) || | |
234 | __get_user(new_ka.sa.sa_handler, &act->sa_handler) || | |
235 | __get_user(new_ka.sa.sa_restorer, &act->sa_restorer)) | |
236 | return -EFAULT; | |
237 | __get_user(new_ka.sa.sa_flags, &act->sa_flags); | |
238 | __get_user(mask, &act->sa_mask); | |
239 | siginitset(&new_ka.sa.sa_mask, mask); | |
240 | } | |
241 | ||
242 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
243 | ||
244 | if (!ret && oact) { | |
245 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || | |
246 | __put_user(old_ka.sa.sa_handler, &oact->sa_handler) || | |
247 | __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer)) | |
248 | return -EFAULT; | |
249 | __put_user(old_ka.sa.sa_flags, &oact->sa_flags); | |
250 | __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask); | |
251 | } | |
252 | ||
253 | return ret; | |
254 | } | |
255 | ||
256 | asmlinkage int | |
257 | sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss, | |
258 | unsigned long r4, unsigned long r5, unsigned long r6, | |
259 | unsigned long r7, | |
260 | struct pt_regs * regs) | |
261 | { | |
262 | return do_sigaltstack(uss, uoss, REF_REG_SP); | |
263 | } | |
264 | ||
1da177e4 LT |
265 | /* |
266 | * Do a signal return; undo the signal stack. | |
267 | */ | |
94e2fb3d | 268 | struct sigframe { |
1da177e4 LT |
269 | struct sigcontext sc; |
270 | unsigned long extramask[_NSIG_WORDS-1]; | |
271 | long long retcode[2]; | |
272 | }; | |
273 | ||
94e2fb3d | 274 | struct rt_sigframe { |
1da177e4 LT |
275 | struct siginfo __user *pinfo; |
276 | void *puc; | |
277 | struct siginfo info; | |
278 | struct ucontext uc; | |
279 | long long retcode[2]; | |
280 | }; | |
281 | ||
282 | #ifdef CONFIG_SH_FPU | |
283 | static inline int | |
284 | restore_sigcontext_fpu(struct pt_regs *regs, struct sigcontext __user *sc) | |
285 | { | |
286 | int err = 0; | |
287 | int fpvalid; | |
288 | ||
289 | err |= __get_user (fpvalid, &sc->sc_fpvalid); | |
290 | conditional_used_math(fpvalid); | |
291 | if (! fpvalid) | |
292 | return err; | |
293 | ||
294 | if (current == last_task_used_math) { | |
295 | last_task_used_math = NULL; | |
296 | regs->sr |= SR_FD; | |
297 | } | |
298 | ||
299 | err |= __copy_from_user(¤t->thread.fpu.hard, &sc->sc_fpregs[0], | |
300 | (sizeof(long long) * 32) + (sizeof(int) * 1)); | |
301 | ||
302 | return err; | |
303 | } | |
304 | ||
305 | static inline int | |
306 | setup_sigcontext_fpu(struct pt_regs *regs, struct sigcontext __user *sc) | |
307 | { | |
308 | int err = 0; | |
309 | int fpvalid; | |
310 | ||
311 | fpvalid = !!used_math(); | |
312 | err |= __put_user(fpvalid, &sc->sc_fpvalid); | |
313 | if (! fpvalid) | |
314 | return err; | |
315 | ||
316 | if (current == last_task_used_math) { | |
600ee240 | 317 | enable_fpu(); |
332fd57b | 318 | save_fpu(current, regs); |
600ee240 | 319 | disable_fpu(); |
1da177e4 LT |
320 | last_task_used_math = NULL; |
321 | regs->sr |= SR_FD; | |
322 | } | |
323 | ||
324 | err |= __copy_to_user(&sc->sc_fpregs[0], ¤t->thread.fpu.hard, | |
325 | (sizeof(long long) * 32) + (sizeof(int) * 1)); | |
326 | clear_used_math(); | |
327 | ||
328 | return err; | |
329 | } | |
330 | #else | |
331 | static inline int | |
332 | restore_sigcontext_fpu(struct pt_regs *regs, struct sigcontext __user *sc) | |
f7a7b153 PM |
333 | { |
334 | return 0; | |
335 | } | |
1da177e4 LT |
336 | static inline int |
337 | setup_sigcontext_fpu(struct pt_regs *regs, struct sigcontext __user *sc) | |
f7a7b153 PM |
338 | { |
339 | return 0; | |
340 | } | |
1da177e4 LT |
341 | #endif |
342 | ||
343 | static int | |
344 | restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, long long *r2_p) | |
345 | { | |
346 | unsigned int err = 0; | |
347 | unsigned long long current_sr, new_sr; | |
348 | #define SR_MASK 0xffff8cfd | |
349 | ||
350 | #define COPY(x) err |= __get_user(regs->x, &sc->sc_##x) | |
351 | ||
352 | COPY(regs[0]); COPY(regs[1]); COPY(regs[2]); COPY(regs[3]); | |
353 | COPY(regs[4]); COPY(regs[5]); COPY(regs[6]); COPY(regs[7]); | |
354 | COPY(regs[8]); COPY(regs[9]); COPY(regs[10]); COPY(regs[11]); | |
355 | COPY(regs[12]); COPY(regs[13]); COPY(regs[14]); COPY(regs[15]); | |
356 | COPY(regs[16]); COPY(regs[17]); COPY(regs[18]); COPY(regs[19]); | |
357 | COPY(regs[20]); COPY(regs[21]); COPY(regs[22]); COPY(regs[23]); | |
358 | COPY(regs[24]); COPY(regs[25]); COPY(regs[26]); COPY(regs[27]); | |
359 | COPY(regs[28]); COPY(regs[29]); COPY(regs[30]); COPY(regs[31]); | |
360 | COPY(regs[32]); COPY(regs[33]); COPY(regs[34]); COPY(regs[35]); | |
361 | COPY(regs[36]); COPY(regs[37]); COPY(regs[38]); COPY(regs[39]); | |
362 | COPY(regs[40]); COPY(regs[41]); COPY(regs[42]); COPY(regs[43]); | |
363 | COPY(regs[44]); COPY(regs[45]); COPY(regs[46]); COPY(regs[47]); | |
364 | COPY(regs[48]); COPY(regs[49]); COPY(regs[50]); COPY(regs[51]); | |
365 | COPY(regs[52]); COPY(regs[53]); COPY(regs[54]); COPY(regs[55]); | |
366 | COPY(regs[56]); COPY(regs[57]); COPY(regs[58]); COPY(regs[59]); | |
367 | COPY(regs[60]); COPY(regs[61]); COPY(regs[62]); | |
368 | COPY(tregs[0]); COPY(tregs[1]); COPY(tregs[2]); COPY(tregs[3]); | |
369 | COPY(tregs[4]); COPY(tregs[5]); COPY(tregs[6]); COPY(tregs[7]); | |
370 | ||
371 | /* Prevent the signal handler manipulating SR in a way that can | |
372 | crash the kernel. i.e. only allow S, Q, M, PR, SZ, FR to be | |
373 | modified */ | |
374 | current_sr = regs->sr; | |
375 | err |= __get_user(new_sr, &sc->sc_sr); | |
376 | regs->sr &= SR_MASK; | |
377 | regs->sr |= (new_sr & ~SR_MASK); | |
378 | ||
379 | COPY(pc); | |
380 | ||
381 | #undef COPY | |
382 | ||
383 | /* Must do this last in case it sets regs->sr.fd (i.e. after rest of sr | |
384 | * has been restored above.) */ | |
385 | err |= restore_sigcontext_fpu(regs, sc); | |
386 | ||
387 | regs->syscall_nr = -1; /* disable syscall checks */ | |
388 | err |= __get_user(*r2_p, &sc->sc_regs[REG_RET]); | |
389 | return err; | |
390 | } | |
391 | ||
392 | asmlinkage int sys_sigreturn(unsigned long r2, unsigned long r3, | |
393 | unsigned long r4, unsigned long r5, | |
394 | unsigned long r6, unsigned long r7, | |
395 | struct pt_regs * regs) | |
396 | { | |
397 | struct sigframe __user *frame = (struct sigframe __user *) (long) REF_REG_SP; | |
398 | sigset_t set; | |
399 | long long ret; | |
400 | ||
1bec157a PM |
401 | /* Always make any pending restarted system calls return -EINTR */ |
402 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
403 | ||
1da177e4 LT |
404 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
405 | goto badframe; | |
406 | ||
407 | if (__get_user(set.sig[0], &frame->sc.oldmask) | |
408 | || (_NSIG_WORDS > 1 | |
409 | && __copy_from_user(&set.sig[1], &frame->extramask, | |
410 | sizeof(frame->extramask)))) | |
411 | goto badframe; | |
412 | ||
413 | sigdelsetmask(&set, ~_BLOCKABLE); | |
414 | ||
415 | spin_lock_irq(¤t->sighand->siglock); | |
416 | current->blocked = set; | |
417 | recalc_sigpending(); | |
418 | spin_unlock_irq(¤t->sighand->siglock); | |
419 | ||
420 | if (restore_sigcontext(regs, &frame->sc, &ret)) | |
421 | goto badframe; | |
422 | regs->pc -= 4; | |
423 | ||
424 | return (int) ret; | |
425 | ||
426 | badframe: | |
427 | force_sig(SIGSEGV, current); | |
428 | return 0; | |
429 | } | |
430 | ||
431 | asmlinkage int sys_rt_sigreturn(unsigned long r2, unsigned long r3, | |
432 | unsigned long r4, unsigned long r5, | |
433 | unsigned long r6, unsigned long r7, | |
434 | struct pt_regs * regs) | |
435 | { | |
436 | struct rt_sigframe __user *frame = (struct rt_sigframe __user *) (long) REF_REG_SP; | |
437 | sigset_t set; | |
438 | stack_t __user st; | |
439 | long long ret; | |
440 | ||
1bec157a PM |
441 | /* Always make any pending restarted system calls return -EINTR */ |
442 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
443 | ||
1da177e4 LT |
444 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
445 | goto badframe; | |
446 | ||
447 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) | |
448 | goto badframe; | |
449 | ||
450 | sigdelsetmask(&set, ~_BLOCKABLE); | |
451 | spin_lock_irq(¤t->sighand->siglock); | |
452 | current->blocked = set; | |
453 | recalc_sigpending(); | |
454 | spin_unlock_irq(¤t->sighand->siglock); | |
455 | ||
456 | if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &ret)) | |
457 | goto badframe; | |
458 | regs->pc -= 4; | |
459 | ||
460 | if (__copy_from_user(&st, &frame->uc.uc_stack, sizeof(st))) | |
461 | goto badframe; | |
462 | /* It is more difficult to avoid calling this function than to | |
463 | call it and ignore errors. */ | |
464 | do_sigaltstack(&st, NULL, REF_REG_SP); | |
465 | ||
466 | return (int) ret; | |
467 | ||
468 | badframe: | |
469 | force_sig(SIGSEGV, current); | |
470 | return 0; | |
471 | } | |
472 | ||
473 | /* | |
474 | * Set up a signal frame. | |
475 | */ | |
1da177e4 LT |
476 | static int |
477 | setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, | |
478 | unsigned long mask) | |
479 | { | |
480 | int err = 0; | |
481 | ||
482 | /* Do this first, otherwise is this sets sr->fd, that value isn't preserved. */ | |
483 | err |= setup_sigcontext_fpu(regs, sc); | |
484 | ||
485 | #define COPY(x) err |= __put_user(regs->x, &sc->sc_##x) | |
486 | ||
487 | COPY(regs[0]); COPY(regs[1]); COPY(regs[2]); COPY(regs[3]); | |
488 | COPY(regs[4]); COPY(regs[5]); COPY(regs[6]); COPY(regs[7]); | |
489 | COPY(regs[8]); COPY(regs[9]); COPY(regs[10]); COPY(regs[11]); | |
490 | COPY(regs[12]); COPY(regs[13]); COPY(regs[14]); COPY(regs[15]); | |
491 | COPY(regs[16]); COPY(regs[17]); COPY(regs[18]); COPY(regs[19]); | |
492 | COPY(regs[20]); COPY(regs[21]); COPY(regs[22]); COPY(regs[23]); | |
493 | COPY(regs[24]); COPY(regs[25]); COPY(regs[26]); COPY(regs[27]); | |
494 | COPY(regs[28]); COPY(regs[29]); COPY(regs[30]); COPY(regs[31]); | |
495 | COPY(regs[32]); COPY(regs[33]); COPY(regs[34]); COPY(regs[35]); | |
496 | COPY(regs[36]); COPY(regs[37]); COPY(regs[38]); COPY(regs[39]); | |
497 | COPY(regs[40]); COPY(regs[41]); COPY(regs[42]); COPY(regs[43]); | |
498 | COPY(regs[44]); COPY(regs[45]); COPY(regs[46]); COPY(regs[47]); | |
499 | COPY(regs[48]); COPY(regs[49]); COPY(regs[50]); COPY(regs[51]); | |
500 | COPY(regs[52]); COPY(regs[53]); COPY(regs[54]); COPY(regs[55]); | |
501 | COPY(regs[56]); COPY(regs[57]); COPY(regs[58]); COPY(regs[59]); | |
502 | COPY(regs[60]); COPY(regs[61]); COPY(regs[62]); | |
503 | COPY(tregs[0]); COPY(tregs[1]); COPY(tregs[2]); COPY(tregs[3]); | |
504 | COPY(tregs[4]); COPY(tregs[5]); COPY(tregs[6]); COPY(tregs[7]); | |
505 | COPY(sr); COPY(pc); | |
506 | ||
507 | #undef COPY | |
508 | ||
509 | err |= __put_user(mask, &sc->oldmask); | |
510 | ||
511 | return err; | |
512 | } | |
513 | ||
514 | /* | |
515 | * Determine which stack to use.. | |
516 | */ | |
517 | static inline void __user * | |
518 | get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size) | |
519 | { | |
d09042da | 520 | if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && ! sas_ss_flags(sp)) |
1da177e4 LT |
521 | sp = current->sas_ss_sp + current->sas_ss_size; |
522 | ||
523 | return (void __user *)((sp - frame_size) & -8ul); | |
524 | } | |
525 | ||
526 | void sa_default_restorer(void); /* See comments below */ | |
527 | void sa_default_rt_restorer(void); /* See comments below */ | |
528 | ||
6ac03437 PM |
529 | static int setup_frame(int sig, struct k_sigaction *ka, |
530 | sigset_t *set, struct pt_regs *regs) | |
1da177e4 LT |
531 | { |
532 | struct sigframe __user *frame; | |
533 | int err = 0; | |
534 | int signal; | |
535 | ||
536 | frame = get_sigframe(ka, regs->regs[REG_SP], sizeof(*frame)); | |
537 | ||
538 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
539 | goto give_sigsegv; | |
540 | ||
541 | signal = current_thread_info()->exec_domain | |
542 | && current_thread_info()->exec_domain->signal_invmap | |
543 | && sig < 32 | |
544 | ? current_thread_info()->exec_domain->signal_invmap[sig] | |
545 | : sig; | |
546 | ||
547 | err |= setup_sigcontext(&frame->sc, regs, set->sig[0]); | |
548 | ||
549 | /* Give up earlier as i386, in case */ | |
550 | if (err) | |
551 | goto give_sigsegv; | |
552 | ||
553 | if (_NSIG_WORDS > 1) { | |
554 | err |= __copy_to_user(frame->extramask, &set->sig[1], | |
555 | sizeof(frame->extramask)); } | |
556 | ||
557 | /* Give up earlier as i386, in case */ | |
558 | if (err) | |
559 | goto give_sigsegv; | |
560 | ||
561 | /* Set up to return from userspace. If provided, use a stub | |
562 | already in userspace. */ | |
563 | if (ka->sa.sa_flags & SA_RESTORER) { | |
564 | DEREF_REG_PR = (unsigned long) ka->sa.sa_restorer | 0x1; | |
565 | ||
566 | /* | |
567 | * On SH5 all edited pointers are subject to NEFF | |
568 | */ | |
569 | DEREF_REG_PR = (DEREF_REG_PR & NEFF_SIGN) ? | |
1bec157a | 570 | (DEREF_REG_PR | NEFF_MASK) : DEREF_REG_PR; |
1da177e4 LT |
571 | } else { |
572 | /* | |
573 | * Different approach on SH5. | |
574 | * . Endianness independent asm code gets placed in entry.S . | |
575 | * This is limited to four ASM instructions corresponding | |
576 | * to two long longs in size. | |
577 | * . err checking is done on the else branch only | |
578 | * . flush_icache_range() is called upon __put_user() only | |
579 | * . all edited pointers are subject to NEFF | |
580 | * . being code, linker turns ShMedia bit on, always | |
581 | * dereference index -1. | |
582 | */ | |
583 | DEREF_REG_PR = (unsigned long) frame->retcode | 0x01; | |
584 | DEREF_REG_PR = (DEREF_REG_PR & NEFF_SIGN) ? | |
1bec157a | 585 | (DEREF_REG_PR | NEFF_MASK) : DEREF_REG_PR; |
1da177e4 LT |
586 | |
587 | if (__copy_to_user(frame->retcode, | |
091db045 | 588 | (void *)((unsigned long)sa_default_restorer & (~1)), 16) != 0) |
1da177e4 LT |
589 | goto give_sigsegv; |
590 | ||
591 | /* Cohere the trampoline with the I-cache. */ | |
b613881e | 592 | flush_cache_sigtramp(DEREF_REG_PR-1); |
1da177e4 LT |
593 | } |
594 | ||
595 | /* | |
596 | * Set up registers for signal handler. | |
597 | * All edited pointers are subject to NEFF. | |
598 | */ | |
599 | regs->regs[REG_SP] = (unsigned long) frame; | |
600 | regs->regs[REG_SP] = (regs->regs[REG_SP] & NEFF_SIGN) ? | |
1bec157a | 601 | (regs->regs[REG_SP] | NEFF_MASK) : regs->regs[REG_SP]; |
1da177e4 LT |
602 | regs->regs[REG_ARG1] = signal; /* Arg for signal handler */ |
603 | ||
604 | /* FIXME: | |
605 | The glibc profiling support for SH-5 needs to be passed a sigcontext | |
606 | so it can retrieve the PC. At some point during 2003 the glibc | |
607 | support was changed to receive the sigcontext through the 2nd | |
608 | argument, but there are still versions of libc.so in use that use | |
609 | the 3rd argument. Until libc.so is stabilised, pass the sigcontext | |
610 | through both 2nd and 3rd arguments. | |
611 | */ | |
612 | ||
613 | regs->regs[REG_ARG2] = (unsigned long long)(unsigned long)(signed long)&frame->sc; | |
614 | regs->regs[REG_ARG3] = (unsigned long long)(unsigned long)(signed long)&frame->sc; | |
615 | ||
616 | regs->pc = (unsigned long) ka->sa.sa_handler; | |
617 | regs->pc = (regs->pc & NEFF_SIGN) ? (regs->pc | NEFF_MASK) : regs->pc; | |
618 | ||
619 | set_fs(USER_DS); | |
620 | ||
1da177e4 | 621 | /* Broken %016Lx */ |
6ac03437 PM |
622 | pr_debug("SIG deliver (#%d,%s:%d): sp=%p pc=%08Lx%08Lx link=%08Lx%08Lx\n", |
623 | signal, current->comm, current->pid, frame, | |
624 | regs->pc >> 32, regs->pc & 0xffffffff, | |
625 | DEREF_REG_PR >> 32, DEREF_REG_PR & 0xffffffff); | |
1da177e4 | 626 | |
6ac03437 | 627 | return 0; |
1da177e4 LT |
628 | |
629 | give_sigsegv: | |
630 | force_sigsegv(sig, current); | |
6ac03437 | 631 | return -EFAULT; |
1da177e4 LT |
632 | } |
633 | ||
6ac03437 PM |
634 | static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, |
635 | sigset_t *set, struct pt_regs *regs) | |
1da177e4 LT |
636 | { |
637 | struct rt_sigframe __user *frame; | |
638 | int err = 0; | |
639 | int signal; | |
640 | ||
641 | frame = get_sigframe(ka, regs->regs[REG_SP], sizeof(*frame)); | |
642 | ||
643 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
644 | goto give_sigsegv; | |
645 | ||
646 | signal = current_thread_info()->exec_domain | |
647 | && current_thread_info()->exec_domain->signal_invmap | |
648 | && sig < 32 | |
649 | ? current_thread_info()->exec_domain->signal_invmap[sig] | |
650 | : sig; | |
651 | ||
652 | err |= __put_user(&frame->info, &frame->pinfo); | |
653 | err |= __put_user(&frame->uc, &frame->puc); | |
654 | err |= copy_siginfo_to_user(&frame->info, info); | |
655 | ||
656 | /* Give up earlier as i386, in case */ | |
657 | if (err) | |
658 | goto give_sigsegv; | |
659 | ||
660 | /* Create the ucontext. */ | |
661 | err |= __put_user(0, &frame->uc.uc_flags); | |
662 | err |= __put_user(0, &frame->uc.uc_link); | |
663 | err |= __put_user((void *)current->sas_ss_sp, | |
664 | &frame->uc.uc_stack.ss_sp); | |
665 | err |= __put_user(sas_ss_flags(regs->regs[REG_SP]), | |
666 | &frame->uc.uc_stack.ss_flags); | |
667 | err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size); | |
668 | err |= setup_sigcontext(&frame->uc.uc_mcontext, | |
669 | regs, set->sig[0]); | |
670 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); | |
671 | ||
672 | /* Give up earlier as i386, in case */ | |
673 | if (err) | |
674 | goto give_sigsegv; | |
675 | ||
676 | /* Set up to return from userspace. If provided, use a stub | |
677 | already in userspace. */ | |
678 | if (ka->sa.sa_flags & SA_RESTORER) { | |
679 | DEREF_REG_PR = (unsigned long) ka->sa.sa_restorer | 0x1; | |
680 | ||
681 | /* | |
682 | * On SH5 all edited pointers are subject to NEFF | |
683 | */ | |
684 | DEREF_REG_PR = (DEREF_REG_PR & NEFF_SIGN) ? | |
1bec157a | 685 | (DEREF_REG_PR | NEFF_MASK) : DEREF_REG_PR; |
1da177e4 LT |
686 | } else { |
687 | /* | |
688 | * Different approach on SH5. | |
689 | * . Endianness independent asm code gets placed in entry.S . | |
690 | * This is limited to four ASM instructions corresponding | |
691 | * to two long longs in size. | |
692 | * . err checking is done on the else branch only | |
693 | * . flush_icache_range() is called upon __put_user() only | |
694 | * . all edited pointers are subject to NEFF | |
695 | * . being code, linker turns ShMedia bit on, always | |
696 | * dereference index -1. | |
697 | */ | |
698 | ||
699 | DEREF_REG_PR = (unsigned long) frame->retcode | 0x01; | |
700 | DEREF_REG_PR = (DEREF_REG_PR & NEFF_SIGN) ? | |
1bec157a | 701 | (DEREF_REG_PR | NEFF_MASK) : DEREF_REG_PR; |
1da177e4 LT |
702 | |
703 | if (__copy_to_user(frame->retcode, | |
091db045 | 704 | (void *)((unsigned long)sa_default_rt_restorer & (~1)), 16) != 0) |
1da177e4 LT |
705 | goto give_sigsegv; |
706 | ||
707 | flush_icache_range(DEREF_REG_PR-1, DEREF_REG_PR-1+15); | |
708 | } | |
709 | ||
710 | /* | |
711 | * Set up registers for signal handler. | |
712 | * All edited pointers are subject to NEFF. | |
713 | */ | |
714 | regs->regs[REG_SP] = (unsigned long) frame; | |
715 | regs->regs[REG_SP] = (regs->regs[REG_SP] & NEFF_SIGN) ? | |
1bec157a | 716 | (regs->regs[REG_SP] | NEFF_MASK) : regs->regs[REG_SP]; |
1da177e4 LT |
717 | regs->regs[REG_ARG1] = signal; /* Arg for signal handler */ |
718 | regs->regs[REG_ARG2] = (unsigned long long)(unsigned long)(signed long)&frame->info; | |
719 | regs->regs[REG_ARG3] = (unsigned long long)(unsigned long)(signed long)&frame->uc.uc_mcontext; | |
720 | regs->pc = (unsigned long) ka->sa.sa_handler; | |
721 | regs->pc = (regs->pc & NEFF_SIGN) ? (regs->pc | NEFF_MASK) : regs->pc; | |
722 | ||
723 | set_fs(USER_DS); | |
724 | ||
6ac03437 PM |
725 | pr_debug("SIG deliver (#%d,%s:%d): sp=%p pc=%08Lx%08Lx link=%08Lx%08Lx\n", |
726 | signal, current->comm, current->pid, frame, | |
727 | regs->pc >> 32, regs->pc & 0xffffffff, | |
728 | DEREF_REG_PR >> 32, DEREF_REG_PR & 0xffffffff); | |
1da177e4 | 729 | |
6ac03437 | 730 | return 0; |
1da177e4 LT |
731 | |
732 | give_sigsegv: | |
733 | force_sigsegv(sig, current); | |
6ac03437 | 734 | return -EFAULT; |
1da177e4 LT |
735 | } |
736 | ||
737 | /* | |
738 | * OK, we're invoking a handler | |
739 | */ | |
6ac03437 | 740 | static int |
1da177e4 LT |
741 | handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka, |
742 | sigset_t *oldset, struct pt_regs * regs) | |
743 | { | |
6ac03437 PM |
744 | int ret; |
745 | ||
1da177e4 LT |
746 | /* Set up the stack frame */ |
747 | if (ka->sa.sa_flags & SA_SIGINFO) | |
6ac03437 | 748 | ret = setup_rt_frame(sig, ka, info, oldset, regs); |
1da177e4 | 749 | else |
6ac03437 PM |
750 | ret = setup_frame(sig, ka, oldset, regs); |
751 | ||
752 | if (ka->sa.sa_flags & SA_ONESHOT) | |
753 | ka->sa.sa_handler = SIG_DFL; | |
754 | ||
755 | if (ret == 0) { | |
756 | spin_lock_irq(¤t->sighand->siglock); | |
757 | sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); | |
758 | if (!(ka->sa.sa_flags & SA_NODEFER)) | |
759 | sigaddset(¤t->blocked,sig); | |
760 | recalc_sigpending(); | |
761 | spin_unlock_irq(¤t->sighand->siglock); | |
762 | } | |
1da177e4 | 763 | |
6ac03437 | 764 | return ret; |
1da177e4 LT |
765 | } |
766 | ||
ab99c733 | 767 | asmlinkage void do_notify_resume(struct pt_regs *regs, unsigned long thread_info_flags) |
1da177e4 | 768 | { |
ab99c733 PM |
769 | if (thread_info_flags & _TIF_SIGPENDING) |
770 | do_signal(regs, 0); | |
c18fe9a0 | 771 | |
ab99c733 PM |
772 | if (thread_info_flags & _TIF_NOTIFY_RESUME) { |
773 | clear_thread_flag(TIF_NOTIFY_RESUME); | |
774 | tracehook_notify_resume(regs); | |
1da177e4 | 775 | } |
1da177e4 | 776 | } |