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1da177e4 | 1 | /* |
a23ba435 | 2 | * arch/sh/kernel/signal_64.c |
1da177e4 LT |
3 | * |
4 | * Copyright (C) 2000, 2001 Paolo Alberelli | |
5 | * Copyright (C) 2003 Paul Mundt | |
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> | |
1da177e4 LT |
25 | #include <asm/ucontext.h> |
26 | #include <asm/uaccess.h> | |
27 | #include <asm/pgtable.h> | |
f7a7b153 | 28 | #include <asm/cacheflush.h> |
1da177e4 LT |
29 | |
30 | #define REG_RET 9 | |
31 | #define REG_ARG1 2 | |
32 | #define REG_ARG2 3 | |
33 | #define REG_ARG3 4 | |
34 | #define REG_SP 15 | |
35 | #define REG_PR 18 | |
36 | #define REF_REG_RET regs->regs[REG_RET] | |
37 | #define REF_REG_SP regs->regs[REG_SP] | |
38 | #define DEREF_REG_PR regs->regs[REG_PR] | |
39 | ||
40 | #define DEBUG_SIG 0 | |
41 | ||
42 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) | |
43 | ||
44 | asmlinkage int do_signal(struct pt_regs *regs, sigset_t *oldset); | |
45 | ||
46 | /* | |
47 | * Atomically swap in the new signal mask, and wait for a signal. | |
48 | */ | |
49 | ||
50 | asmlinkage int | |
51 | sys_sigsuspend(old_sigset_t mask, | |
52 | unsigned long r3, unsigned long r4, unsigned long r5, | |
53 | unsigned long r6, unsigned long r7, | |
54 | struct pt_regs * regs) | |
55 | { | |
56 | sigset_t saveset; | |
57 | ||
58 | mask &= _BLOCKABLE; | |
59 | spin_lock_irq(¤t->sighand->siglock); | |
60 | saveset = current->blocked; | |
61 | siginitset(¤t->blocked, mask); | |
62 | recalc_sigpending(); | |
63 | spin_unlock_irq(¤t->sighand->siglock); | |
64 | ||
65 | REF_REG_RET = -EINTR; | |
66 | while (1) { | |
67 | current->state = TASK_INTERRUPTIBLE; | |
68 | schedule(); | |
69 | regs->pc += 4; /* because sys_sigreturn decrements the pc */ | |
70 | if (do_signal(regs, &saveset)) { | |
71 | /* pc now points at signal handler. Need to decrement | |
72 | it because entry.S will increment it. */ | |
73 | regs->pc -= 4; | |
74 | return -EINTR; | |
75 | } | |
76 | } | |
77 | } | |
78 | ||
79 | asmlinkage int | |
80 | sys_rt_sigsuspend(sigset_t *unewset, size_t sigsetsize, | |
81 | unsigned long r4, unsigned long r5, unsigned long r6, | |
82 | unsigned long r7, | |
83 | struct pt_regs * regs) | |
84 | { | |
85 | sigset_t saveset, newset; | |
86 | ||
87 | /* XXX: Don't preclude handling different sized sigset_t's. */ | |
88 | if (sigsetsize != sizeof(sigset_t)) | |
89 | return -EINVAL; | |
90 | ||
91 | if (copy_from_user(&newset, unewset, sizeof(newset))) | |
92 | return -EFAULT; | |
93 | sigdelsetmask(&newset, ~_BLOCKABLE); | |
94 | spin_lock_irq(¤t->sighand->siglock); | |
95 | saveset = current->blocked; | |
96 | current->blocked = newset; | |
97 | recalc_sigpending(); | |
98 | spin_unlock_irq(¤t->sighand->siglock); | |
99 | ||
100 | REF_REG_RET = -EINTR; | |
101 | while (1) { | |
102 | current->state = TASK_INTERRUPTIBLE; | |
103 | schedule(); | |
104 | regs->pc += 4; /* because sys_sigreturn decrements the pc */ | |
105 | if (do_signal(regs, &saveset)) { | |
106 | /* pc now points at signal handler. Need to decrement | |
107 | it because entry.S will increment it. */ | |
108 | regs->pc -= 4; | |
109 | return -EINTR; | |
110 | } | |
111 | } | |
112 | } | |
113 | ||
114 | asmlinkage int | |
115 | sys_sigaction(int sig, const struct old_sigaction __user *act, | |
116 | struct old_sigaction __user *oact) | |
117 | { | |
118 | struct k_sigaction new_ka, old_ka; | |
119 | int ret; | |
120 | ||
121 | if (act) { | |
122 | old_sigset_t mask; | |
123 | if (!access_ok(VERIFY_READ, act, sizeof(*act)) || | |
124 | __get_user(new_ka.sa.sa_handler, &act->sa_handler) || | |
125 | __get_user(new_ka.sa.sa_restorer, &act->sa_restorer)) | |
126 | return -EFAULT; | |
127 | __get_user(new_ka.sa.sa_flags, &act->sa_flags); | |
128 | __get_user(mask, &act->sa_mask); | |
129 | siginitset(&new_ka.sa.sa_mask, mask); | |
130 | } | |
131 | ||
132 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
133 | ||
134 | if (!ret && oact) { | |
135 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || | |
136 | __put_user(old_ka.sa.sa_handler, &oact->sa_handler) || | |
137 | __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer)) | |
138 | return -EFAULT; | |
139 | __put_user(old_ka.sa.sa_flags, &oact->sa_flags); | |
140 | __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask); | |
141 | } | |
142 | ||
143 | return ret; | |
144 | } | |
145 | ||
146 | asmlinkage int | |
147 | sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss, | |
148 | unsigned long r4, unsigned long r5, unsigned long r6, | |
149 | unsigned long r7, | |
150 | struct pt_regs * regs) | |
151 | { | |
152 | return do_sigaltstack(uss, uoss, REF_REG_SP); | |
153 | } | |
154 | ||
155 | ||
156 | /* | |
157 | * Do a signal return; undo the signal stack. | |
158 | */ | |
159 | ||
160 | struct sigframe | |
161 | { | |
162 | struct sigcontext sc; | |
163 | unsigned long extramask[_NSIG_WORDS-1]; | |
164 | long long retcode[2]; | |
165 | }; | |
166 | ||
167 | struct rt_sigframe | |
168 | { | |
169 | struct siginfo __user *pinfo; | |
170 | void *puc; | |
171 | struct siginfo info; | |
172 | struct ucontext uc; | |
173 | long long retcode[2]; | |
174 | }; | |
175 | ||
176 | #ifdef CONFIG_SH_FPU | |
177 | static inline int | |
178 | restore_sigcontext_fpu(struct pt_regs *regs, struct sigcontext __user *sc) | |
179 | { | |
180 | int err = 0; | |
181 | int fpvalid; | |
182 | ||
183 | err |= __get_user (fpvalid, &sc->sc_fpvalid); | |
184 | conditional_used_math(fpvalid); | |
185 | if (! fpvalid) | |
186 | return err; | |
187 | ||
188 | if (current == last_task_used_math) { | |
189 | last_task_used_math = NULL; | |
190 | regs->sr |= SR_FD; | |
191 | } | |
192 | ||
193 | err |= __copy_from_user(¤t->thread.fpu.hard, &sc->sc_fpregs[0], | |
194 | (sizeof(long long) * 32) + (sizeof(int) * 1)); | |
195 | ||
196 | return err; | |
197 | } | |
198 | ||
199 | static inline int | |
200 | setup_sigcontext_fpu(struct pt_regs *regs, struct sigcontext __user *sc) | |
201 | { | |
202 | int err = 0; | |
203 | int fpvalid; | |
204 | ||
205 | fpvalid = !!used_math(); | |
206 | err |= __put_user(fpvalid, &sc->sc_fpvalid); | |
207 | if (! fpvalid) | |
208 | return err; | |
209 | ||
210 | if (current == last_task_used_math) { | |
600ee240 | 211 | enable_fpu(); |
332fd57b | 212 | save_fpu(current, regs); |
600ee240 | 213 | disable_fpu(); |
1da177e4 LT |
214 | last_task_used_math = NULL; |
215 | regs->sr |= SR_FD; | |
216 | } | |
217 | ||
218 | err |= __copy_to_user(&sc->sc_fpregs[0], ¤t->thread.fpu.hard, | |
219 | (sizeof(long long) * 32) + (sizeof(int) * 1)); | |
220 | clear_used_math(); | |
221 | ||
222 | return err; | |
223 | } | |
224 | #else | |
225 | static inline int | |
226 | restore_sigcontext_fpu(struct pt_regs *regs, struct sigcontext __user *sc) | |
f7a7b153 PM |
227 | { |
228 | return 0; | |
229 | } | |
1da177e4 LT |
230 | static inline int |
231 | setup_sigcontext_fpu(struct pt_regs *regs, struct sigcontext __user *sc) | |
f7a7b153 PM |
232 | { |
233 | return 0; | |
234 | } | |
1da177e4 LT |
235 | #endif |
236 | ||
237 | static int | |
238 | restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, long long *r2_p) | |
239 | { | |
240 | unsigned int err = 0; | |
241 | unsigned long long current_sr, new_sr; | |
242 | #define SR_MASK 0xffff8cfd | |
243 | ||
244 | #define COPY(x) err |= __get_user(regs->x, &sc->sc_##x) | |
245 | ||
246 | COPY(regs[0]); COPY(regs[1]); COPY(regs[2]); COPY(regs[3]); | |
247 | COPY(regs[4]); COPY(regs[5]); COPY(regs[6]); COPY(regs[7]); | |
248 | COPY(regs[8]); COPY(regs[9]); COPY(regs[10]); COPY(regs[11]); | |
249 | COPY(regs[12]); COPY(regs[13]); COPY(regs[14]); COPY(regs[15]); | |
250 | COPY(regs[16]); COPY(regs[17]); COPY(regs[18]); COPY(regs[19]); | |
251 | COPY(regs[20]); COPY(regs[21]); COPY(regs[22]); COPY(regs[23]); | |
252 | COPY(regs[24]); COPY(regs[25]); COPY(regs[26]); COPY(regs[27]); | |
253 | COPY(regs[28]); COPY(regs[29]); COPY(regs[30]); COPY(regs[31]); | |
254 | COPY(regs[32]); COPY(regs[33]); COPY(regs[34]); COPY(regs[35]); | |
255 | COPY(regs[36]); COPY(regs[37]); COPY(regs[38]); COPY(regs[39]); | |
256 | COPY(regs[40]); COPY(regs[41]); COPY(regs[42]); COPY(regs[43]); | |
257 | COPY(regs[44]); COPY(regs[45]); COPY(regs[46]); COPY(regs[47]); | |
258 | COPY(regs[48]); COPY(regs[49]); COPY(regs[50]); COPY(regs[51]); | |
259 | COPY(regs[52]); COPY(regs[53]); COPY(regs[54]); COPY(regs[55]); | |
260 | COPY(regs[56]); COPY(regs[57]); COPY(regs[58]); COPY(regs[59]); | |
261 | COPY(regs[60]); COPY(regs[61]); COPY(regs[62]); | |
262 | COPY(tregs[0]); COPY(tregs[1]); COPY(tregs[2]); COPY(tregs[3]); | |
263 | COPY(tregs[4]); COPY(tregs[5]); COPY(tregs[6]); COPY(tregs[7]); | |
264 | ||
265 | /* Prevent the signal handler manipulating SR in a way that can | |
266 | crash the kernel. i.e. only allow S, Q, M, PR, SZ, FR to be | |
267 | modified */ | |
268 | current_sr = regs->sr; | |
269 | err |= __get_user(new_sr, &sc->sc_sr); | |
270 | regs->sr &= SR_MASK; | |
271 | regs->sr |= (new_sr & ~SR_MASK); | |
272 | ||
273 | COPY(pc); | |
274 | ||
275 | #undef COPY | |
276 | ||
277 | /* Must do this last in case it sets regs->sr.fd (i.e. after rest of sr | |
278 | * has been restored above.) */ | |
279 | err |= restore_sigcontext_fpu(regs, sc); | |
280 | ||
281 | regs->syscall_nr = -1; /* disable syscall checks */ | |
282 | err |= __get_user(*r2_p, &sc->sc_regs[REG_RET]); | |
283 | return err; | |
284 | } | |
285 | ||
286 | asmlinkage int sys_sigreturn(unsigned long r2, unsigned long r3, | |
287 | unsigned long r4, unsigned long r5, | |
288 | unsigned long r6, unsigned long r7, | |
289 | struct pt_regs * regs) | |
290 | { | |
291 | struct sigframe __user *frame = (struct sigframe __user *) (long) REF_REG_SP; | |
292 | sigset_t set; | |
293 | long long ret; | |
294 | ||
295 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
296 | goto badframe; | |
297 | ||
298 | if (__get_user(set.sig[0], &frame->sc.oldmask) | |
299 | || (_NSIG_WORDS > 1 | |
300 | && __copy_from_user(&set.sig[1], &frame->extramask, | |
301 | sizeof(frame->extramask)))) | |
302 | goto badframe; | |
303 | ||
304 | sigdelsetmask(&set, ~_BLOCKABLE); | |
305 | ||
306 | spin_lock_irq(¤t->sighand->siglock); | |
307 | current->blocked = set; | |
308 | recalc_sigpending(); | |
309 | spin_unlock_irq(¤t->sighand->siglock); | |
310 | ||
311 | if (restore_sigcontext(regs, &frame->sc, &ret)) | |
312 | goto badframe; | |
313 | regs->pc -= 4; | |
314 | ||
315 | return (int) ret; | |
316 | ||
317 | badframe: | |
318 | force_sig(SIGSEGV, current); | |
319 | return 0; | |
320 | } | |
321 | ||
322 | asmlinkage int sys_rt_sigreturn(unsigned long r2, unsigned long r3, | |
323 | unsigned long r4, unsigned long r5, | |
324 | unsigned long r6, unsigned long r7, | |
325 | struct pt_regs * regs) | |
326 | { | |
327 | struct rt_sigframe __user *frame = (struct rt_sigframe __user *) (long) REF_REG_SP; | |
328 | sigset_t set; | |
329 | stack_t __user st; | |
330 | long long ret; | |
331 | ||
332 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
333 | goto badframe; | |
334 | ||
335 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) | |
336 | goto badframe; | |
337 | ||
338 | sigdelsetmask(&set, ~_BLOCKABLE); | |
339 | spin_lock_irq(¤t->sighand->siglock); | |
340 | current->blocked = set; | |
341 | recalc_sigpending(); | |
342 | spin_unlock_irq(¤t->sighand->siglock); | |
343 | ||
344 | if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &ret)) | |
345 | goto badframe; | |
346 | regs->pc -= 4; | |
347 | ||
348 | if (__copy_from_user(&st, &frame->uc.uc_stack, sizeof(st))) | |
349 | goto badframe; | |
350 | /* It is more difficult to avoid calling this function than to | |
351 | call it and ignore errors. */ | |
352 | do_sigaltstack(&st, NULL, REF_REG_SP); | |
353 | ||
354 | return (int) ret; | |
355 | ||
356 | badframe: | |
357 | force_sig(SIGSEGV, current); | |
358 | return 0; | |
359 | } | |
360 | ||
361 | /* | |
362 | * Set up a signal frame. | |
363 | */ | |
364 | ||
365 | static int | |
366 | setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, | |
367 | unsigned long mask) | |
368 | { | |
369 | int err = 0; | |
370 | ||
371 | /* Do this first, otherwise is this sets sr->fd, that value isn't preserved. */ | |
372 | err |= setup_sigcontext_fpu(regs, sc); | |
373 | ||
374 | #define COPY(x) err |= __put_user(regs->x, &sc->sc_##x) | |
375 | ||
376 | COPY(regs[0]); COPY(regs[1]); COPY(regs[2]); COPY(regs[3]); | |
377 | COPY(regs[4]); COPY(regs[5]); COPY(regs[6]); COPY(regs[7]); | |
378 | COPY(regs[8]); COPY(regs[9]); COPY(regs[10]); COPY(regs[11]); | |
379 | COPY(regs[12]); COPY(regs[13]); COPY(regs[14]); COPY(regs[15]); | |
380 | COPY(regs[16]); COPY(regs[17]); COPY(regs[18]); COPY(regs[19]); | |
381 | COPY(regs[20]); COPY(regs[21]); COPY(regs[22]); COPY(regs[23]); | |
382 | COPY(regs[24]); COPY(regs[25]); COPY(regs[26]); COPY(regs[27]); | |
383 | COPY(regs[28]); COPY(regs[29]); COPY(regs[30]); COPY(regs[31]); | |
384 | COPY(regs[32]); COPY(regs[33]); COPY(regs[34]); COPY(regs[35]); | |
385 | COPY(regs[36]); COPY(regs[37]); COPY(regs[38]); COPY(regs[39]); | |
386 | COPY(regs[40]); COPY(regs[41]); COPY(regs[42]); COPY(regs[43]); | |
387 | COPY(regs[44]); COPY(regs[45]); COPY(regs[46]); COPY(regs[47]); | |
388 | COPY(regs[48]); COPY(regs[49]); COPY(regs[50]); COPY(regs[51]); | |
389 | COPY(regs[52]); COPY(regs[53]); COPY(regs[54]); COPY(regs[55]); | |
390 | COPY(regs[56]); COPY(regs[57]); COPY(regs[58]); COPY(regs[59]); | |
391 | COPY(regs[60]); COPY(regs[61]); COPY(regs[62]); | |
392 | COPY(tregs[0]); COPY(tregs[1]); COPY(tregs[2]); COPY(tregs[3]); | |
393 | COPY(tregs[4]); COPY(tregs[5]); COPY(tregs[6]); COPY(tregs[7]); | |
394 | COPY(sr); COPY(pc); | |
395 | ||
396 | #undef COPY | |
397 | ||
398 | err |= __put_user(mask, &sc->oldmask); | |
399 | ||
400 | return err; | |
401 | } | |
402 | ||
403 | /* | |
404 | * Determine which stack to use.. | |
405 | */ | |
406 | static inline void __user * | |
407 | get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size) | |
408 | { | |
d09042da | 409 | if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && ! sas_ss_flags(sp)) |
1da177e4 LT |
410 | sp = current->sas_ss_sp + current->sas_ss_size; |
411 | ||
412 | return (void __user *)((sp - frame_size) & -8ul); | |
413 | } | |
414 | ||
415 | void sa_default_restorer(void); /* See comments below */ | |
416 | void sa_default_rt_restorer(void); /* See comments below */ | |
417 | ||
418 | static void setup_frame(int sig, struct k_sigaction *ka, | |
419 | sigset_t *set, struct pt_regs *regs) | |
420 | { | |
421 | struct sigframe __user *frame; | |
422 | int err = 0; | |
423 | int signal; | |
424 | ||
425 | frame = get_sigframe(ka, regs->regs[REG_SP], sizeof(*frame)); | |
426 | ||
427 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
428 | goto give_sigsegv; | |
429 | ||
430 | signal = current_thread_info()->exec_domain | |
431 | && current_thread_info()->exec_domain->signal_invmap | |
432 | && sig < 32 | |
433 | ? current_thread_info()->exec_domain->signal_invmap[sig] | |
434 | : sig; | |
435 | ||
436 | err |= setup_sigcontext(&frame->sc, regs, set->sig[0]); | |
437 | ||
438 | /* Give up earlier as i386, in case */ | |
439 | if (err) | |
440 | goto give_sigsegv; | |
441 | ||
442 | if (_NSIG_WORDS > 1) { | |
443 | err |= __copy_to_user(frame->extramask, &set->sig[1], | |
444 | sizeof(frame->extramask)); } | |
445 | ||
446 | /* Give up earlier as i386, in case */ | |
447 | if (err) | |
448 | goto give_sigsegv; | |
449 | ||
450 | /* Set up to return from userspace. If provided, use a stub | |
451 | already in userspace. */ | |
452 | if (ka->sa.sa_flags & SA_RESTORER) { | |
453 | DEREF_REG_PR = (unsigned long) ka->sa.sa_restorer | 0x1; | |
454 | ||
455 | /* | |
456 | * On SH5 all edited pointers are subject to NEFF | |
457 | */ | |
458 | DEREF_REG_PR = (DEREF_REG_PR & NEFF_SIGN) ? | |
459 | (DEREF_REG_PR | NEFF_MASK) : DEREF_REG_PR; | |
460 | } else { | |
461 | /* | |
462 | * Different approach on SH5. | |
463 | * . Endianness independent asm code gets placed in entry.S . | |
464 | * This is limited to four ASM instructions corresponding | |
465 | * to two long longs in size. | |
466 | * . err checking is done on the else branch only | |
467 | * . flush_icache_range() is called upon __put_user() only | |
468 | * . all edited pointers are subject to NEFF | |
469 | * . being code, linker turns ShMedia bit on, always | |
470 | * dereference index -1. | |
471 | */ | |
472 | DEREF_REG_PR = (unsigned long) frame->retcode | 0x01; | |
473 | DEREF_REG_PR = (DEREF_REG_PR & NEFF_SIGN) ? | |
474 | (DEREF_REG_PR | NEFF_MASK) : DEREF_REG_PR; | |
475 | ||
476 | if (__copy_to_user(frame->retcode, | |
477 | (unsigned long long)sa_default_restorer & (~1), 16) != 0) | |
478 | goto give_sigsegv; | |
479 | ||
480 | /* Cohere the trampoline with the I-cache. */ | |
b613881e | 481 | flush_cache_sigtramp(DEREF_REG_PR-1); |
1da177e4 LT |
482 | } |
483 | ||
484 | /* | |
485 | * Set up registers for signal handler. | |
486 | * All edited pointers are subject to NEFF. | |
487 | */ | |
488 | regs->regs[REG_SP] = (unsigned long) frame; | |
489 | regs->regs[REG_SP] = (regs->regs[REG_SP] & NEFF_SIGN) ? | |
490 | (regs->regs[REG_SP] | NEFF_MASK) : regs->regs[REG_SP]; | |
491 | regs->regs[REG_ARG1] = signal; /* Arg for signal handler */ | |
492 | ||
493 | /* FIXME: | |
494 | The glibc profiling support for SH-5 needs to be passed a sigcontext | |
495 | so it can retrieve the PC. At some point during 2003 the glibc | |
496 | support was changed to receive the sigcontext through the 2nd | |
497 | argument, but there are still versions of libc.so in use that use | |
498 | the 3rd argument. Until libc.so is stabilised, pass the sigcontext | |
499 | through both 2nd and 3rd arguments. | |
500 | */ | |
501 | ||
502 | regs->regs[REG_ARG2] = (unsigned long long)(unsigned long)(signed long)&frame->sc; | |
503 | regs->regs[REG_ARG3] = (unsigned long long)(unsigned long)(signed long)&frame->sc; | |
504 | ||
505 | regs->pc = (unsigned long) ka->sa.sa_handler; | |
506 | regs->pc = (regs->pc & NEFF_SIGN) ? (regs->pc | NEFF_MASK) : regs->pc; | |
507 | ||
508 | set_fs(USER_DS); | |
509 | ||
510 | #if DEBUG_SIG | |
511 | /* Broken %016Lx */ | |
512 | printk("SIG deliver (#%d,%s:%d): sp=%p pc=%08Lx%08Lx link=%08Lx%08Lx\n", | |
513 | signal, | |
514 | current->comm, current->pid, frame, | |
515 | regs->pc >> 32, regs->pc & 0xffffffff, | |
516 | DEREF_REG_PR >> 32, DEREF_REG_PR & 0xffffffff); | |
517 | #endif | |
518 | ||
519 | return; | |
520 | ||
521 | give_sigsegv: | |
522 | force_sigsegv(sig, current); | |
523 | } | |
524 | ||
525 | static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, | |
526 | sigset_t *set, struct pt_regs *regs) | |
527 | { | |
528 | struct rt_sigframe __user *frame; | |
529 | int err = 0; | |
530 | int signal; | |
531 | ||
532 | frame = get_sigframe(ka, regs->regs[REG_SP], sizeof(*frame)); | |
533 | ||
534 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
535 | goto give_sigsegv; | |
536 | ||
537 | signal = current_thread_info()->exec_domain | |
538 | && current_thread_info()->exec_domain->signal_invmap | |
539 | && sig < 32 | |
540 | ? current_thread_info()->exec_domain->signal_invmap[sig] | |
541 | : sig; | |
542 | ||
543 | err |= __put_user(&frame->info, &frame->pinfo); | |
544 | err |= __put_user(&frame->uc, &frame->puc); | |
545 | err |= copy_siginfo_to_user(&frame->info, info); | |
546 | ||
547 | /* Give up earlier as i386, in case */ | |
548 | if (err) | |
549 | goto give_sigsegv; | |
550 | ||
551 | /* Create the ucontext. */ | |
552 | err |= __put_user(0, &frame->uc.uc_flags); | |
553 | err |= __put_user(0, &frame->uc.uc_link); | |
554 | err |= __put_user((void *)current->sas_ss_sp, | |
555 | &frame->uc.uc_stack.ss_sp); | |
556 | err |= __put_user(sas_ss_flags(regs->regs[REG_SP]), | |
557 | &frame->uc.uc_stack.ss_flags); | |
558 | err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size); | |
559 | err |= setup_sigcontext(&frame->uc.uc_mcontext, | |
560 | regs, set->sig[0]); | |
561 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); | |
562 | ||
563 | /* Give up earlier as i386, in case */ | |
564 | if (err) | |
565 | goto give_sigsegv; | |
566 | ||
567 | /* Set up to return from userspace. If provided, use a stub | |
568 | already in userspace. */ | |
569 | if (ka->sa.sa_flags & SA_RESTORER) { | |
570 | DEREF_REG_PR = (unsigned long) ka->sa.sa_restorer | 0x1; | |
571 | ||
572 | /* | |
573 | * On SH5 all edited pointers are subject to NEFF | |
574 | */ | |
575 | DEREF_REG_PR = (DEREF_REG_PR & NEFF_SIGN) ? | |
576 | (DEREF_REG_PR | NEFF_MASK) : DEREF_REG_PR; | |
577 | } else { | |
578 | /* | |
579 | * Different approach on SH5. | |
580 | * . Endianness independent asm code gets placed in entry.S . | |
581 | * This is limited to four ASM instructions corresponding | |
582 | * to two long longs in size. | |
583 | * . err checking is done on the else branch only | |
584 | * . flush_icache_range() is called upon __put_user() only | |
585 | * . all edited pointers are subject to NEFF | |
586 | * . being code, linker turns ShMedia bit on, always | |
587 | * dereference index -1. | |
588 | */ | |
589 | ||
590 | DEREF_REG_PR = (unsigned long) frame->retcode | 0x01; | |
591 | DEREF_REG_PR = (DEREF_REG_PR & NEFF_SIGN) ? | |
592 | (DEREF_REG_PR | NEFF_MASK) : DEREF_REG_PR; | |
593 | ||
594 | if (__copy_to_user(frame->retcode, | |
595 | (unsigned long long)sa_default_rt_restorer & (~1), 16) != 0) | |
596 | goto give_sigsegv; | |
597 | ||
598 | flush_icache_range(DEREF_REG_PR-1, DEREF_REG_PR-1+15); | |
599 | } | |
600 | ||
601 | /* | |
602 | * Set up registers for signal handler. | |
603 | * All edited pointers are subject to NEFF. | |
604 | */ | |
605 | regs->regs[REG_SP] = (unsigned long) frame; | |
606 | regs->regs[REG_SP] = (regs->regs[REG_SP] & NEFF_SIGN) ? | |
607 | (regs->regs[REG_SP] | NEFF_MASK) : regs->regs[REG_SP]; | |
608 | regs->regs[REG_ARG1] = signal; /* Arg for signal handler */ | |
609 | regs->regs[REG_ARG2] = (unsigned long long)(unsigned long)(signed long)&frame->info; | |
610 | regs->regs[REG_ARG3] = (unsigned long long)(unsigned long)(signed long)&frame->uc.uc_mcontext; | |
611 | regs->pc = (unsigned long) ka->sa.sa_handler; | |
612 | regs->pc = (regs->pc & NEFF_SIGN) ? (regs->pc | NEFF_MASK) : regs->pc; | |
613 | ||
614 | set_fs(USER_DS); | |
615 | ||
616 | #if DEBUG_SIG | |
617 | /* Broken %016Lx */ | |
618 | printk("SIG deliver (#%d,%s:%d): sp=%p pc=%08Lx%08Lx link=%08Lx%08Lx\n", | |
619 | signal, | |
620 | current->comm, current->pid, frame, | |
621 | regs->pc >> 32, regs->pc & 0xffffffff, | |
622 | DEREF_REG_PR >> 32, DEREF_REG_PR & 0xffffffff); | |
623 | #endif | |
624 | ||
625 | return; | |
626 | ||
627 | give_sigsegv: | |
628 | force_sigsegv(sig, current); | |
629 | } | |
630 | ||
631 | /* | |
632 | * OK, we're invoking a handler | |
633 | */ | |
634 | ||
635 | static void | |
636 | handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka, | |
637 | sigset_t *oldset, struct pt_regs * regs) | |
638 | { | |
639 | /* Are we from a system call? */ | |
640 | if (regs->syscall_nr >= 0) { | |
641 | /* If so, check system call restarting.. */ | |
642 | switch (regs->regs[REG_RET]) { | |
e227e8f3 | 643 | case -ERESTART_RESTARTBLOCK: |
1da177e4 LT |
644 | case -ERESTARTNOHAND: |
645 | regs->regs[REG_RET] = -EINTR; | |
646 | break; | |
647 | ||
648 | case -ERESTARTSYS: | |
649 | if (!(ka->sa.sa_flags & SA_RESTART)) { | |
650 | regs->regs[REG_RET] = -EINTR; | |
651 | break; | |
652 | } | |
653 | /* fallthrough */ | |
654 | case -ERESTARTNOINTR: | |
655 | /* Decode syscall # */ | |
656 | regs->regs[REG_RET] = regs->syscall_nr; | |
657 | regs->pc -= 4; | |
658 | } | |
659 | } | |
660 | ||
661 | /* Set up the stack frame */ | |
662 | if (ka->sa.sa_flags & SA_SIGINFO) | |
663 | setup_rt_frame(sig, ka, info, oldset, regs); | |
664 | else | |
665 | setup_frame(sig, ka, oldset, regs); | |
666 | ||
69be8f18 SR |
667 | spin_lock_irq(¤t->sighand->siglock); |
668 | sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); | |
669 | if (!(ka->sa.sa_flags & SA_NODEFER)) | |
1da177e4 | 670 | sigaddset(¤t->blocked,sig); |
69be8f18 SR |
671 | recalc_sigpending(); |
672 | spin_unlock_irq(¤t->sighand->siglock); | |
1da177e4 LT |
673 | } |
674 | ||
675 | /* | |
676 | * Note that 'init' is a special process: it doesn't get signals it doesn't | |
677 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
678 | * mistake. | |
679 | * | |
680 | * Note that we go through the signals twice: once to check the signals that | |
681 | * the kernel can handle, and then we build all the user-level signal handling | |
682 | * stack-frames in one go after that. | |
683 | */ | |
684 | int do_signal(struct pt_regs *regs, sigset_t *oldset) | |
685 | { | |
686 | siginfo_t info; | |
687 | int signr; | |
688 | struct k_sigaction ka; | |
689 | ||
690 | /* | |
691 | * We want the common case to go fast, which | |
692 | * is why we may in certain cases get here from | |
693 | * kernel mode. Just return without doing anything | |
694 | * if so. | |
695 | */ | |
696 | if (!user_mode(regs)) | |
697 | return 1; | |
698 | ||
0e6c1f5f | 699 | if (try_to_freeze()) |
1da177e4 LT |
700 | goto no_signal; |
701 | ||
c18fe9a0 PM |
702 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) |
703 | oldset = ¤t->saved_sigmask; | |
704 | else if (!oldset) | |
1da177e4 LT |
705 | oldset = ¤t->blocked; |
706 | ||
707 | signr = get_signal_to_deliver(&info, &ka, regs, 0); | |
708 | ||
709 | if (signr > 0) { | |
710 | /* Whee! Actually deliver the signal. */ | |
711 | handle_signal(signr, &info, &ka, oldset, regs); | |
c18fe9a0 PM |
712 | |
713 | /* | |
714 | * If a signal was successfully delivered, the saved sigmask | |
715 | * is in its frame, and we can clear the TIF_RESTORE_SIGMASK | |
716 | * flag. | |
717 | */ | |
718 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) | |
719 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
720 | ||
1da177e4 LT |
721 | return 1; |
722 | } | |
723 | ||
724 | no_signal: | |
725 | /* Did we come from a system call? */ | |
726 | if (regs->syscall_nr >= 0) { | |
727 | /* Restart the system call - no handlers present */ | |
c18fe9a0 PM |
728 | switch (regs->regs[REG_RET]) { |
729 | case -ERESTARTNOHAND: | |
730 | case -ERESTARTSYS: | |
731 | case -ERESTARTNOINTR: | |
1da177e4 LT |
732 | /* Decode Syscall # */ |
733 | regs->regs[REG_RET] = regs->syscall_nr; | |
734 | regs->pc -= 4; | |
c18fe9a0 PM |
735 | break; |
736 | ||
737 | case -ERESTART_RESTARTBLOCK: | |
738 | regs->regs[REG_RET] = __NR_restart_syscall; | |
739 | regs->pc -= 4; | |
740 | break; | |
1da177e4 LT |
741 | } |
742 | } | |
c18fe9a0 PM |
743 | |
744 | /* No signal to deliver -- put the saved sigmask back */ | |
745 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) { | |
746 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
747 | sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); | |
748 | } | |
749 | ||
1da177e4 LT |
750 | return 0; |
751 | } |