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1da177e4 LT |
1 | /* |
2 | * This file is subject to the terms and conditions of the GNU General Public | |
3 | * License. See the file "COPYING" in the main directory of this archive | |
4 | * for more details. | |
5 | * | |
6 | * arch/sh64/kernel/signal.c | |
7 | * | |
8 | * Copyright (C) 2000, 2001 Paolo Alberelli | |
9 | * Copyright (C) 2003 Paul Mundt | |
10 | * Copyright (C) 2004 Richard Curnow | |
11 | * | |
12 | * Started from sh version. | |
13 | * | |
14 | */ | |
15 | #include <linux/rwsem.h> | |
16 | #include <linux/sched.h> | |
17 | #include <linux/mm.h> | |
18 | #include <linux/smp.h> | |
1da177e4 LT |
19 | #include <linux/kernel.h> |
20 | #include <linux/signal.h> | |
21 | #include <linux/errno.h> | |
22 | #include <linux/wait.h> | |
23 | #include <linux/personality.h> | |
7dfb7103 | 24 | #include <linux/freezer.h> |
1da177e4 LT |
25 | #include <linux/ptrace.h> |
26 | #include <linux/unistd.h> | |
27 | #include <linux/stddef.h> | |
1da177e4 LT |
28 | #include <asm/ucontext.h> |
29 | #include <asm/uaccess.h> | |
30 | #include <asm/pgtable.h> | |
31 | ||
32 | ||
33 | #define REG_RET 9 | |
34 | #define REG_ARG1 2 | |
35 | #define REG_ARG2 3 | |
36 | #define REG_ARG3 4 | |
37 | #define REG_SP 15 | |
38 | #define REG_PR 18 | |
39 | #define REF_REG_RET regs->regs[REG_RET] | |
40 | #define REF_REG_SP regs->regs[REG_SP] | |
41 | #define DEREF_REG_PR regs->regs[REG_PR] | |
42 | ||
43 | #define DEBUG_SIG 0 | |
44 | ||
45 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) | |
46 | ||
47 | asmlinkage int do_signal(struct pt_regs *regs, sigset_t *oldset); | |
48 | ||
49 | /* | |
50 | * Atomically swap in the new signal mask, and wait for a signal. | |
51 | */ | |
52 | ||
53 | asmlinkage int | |
54 | sys_sigsuspend(old_sigset_t mask, | |
55 | unsigned long r3, unsigned long r4, unsigned long r5, | |
56 | unsigned long r6, unsigned long r7, | |
57 | struct pt_regs * regs) | |
58 | { | |
59 | sigset_t saveset; | |
60 | ||
61 | mask &= _BLOCKABLE; | |
62 | spin_lock_irq(¤t->sighand->siglock); | |
63 | saveset = current->blocked; | |
64 | siginitset(¤t->blocked, mask); | |
65 | recalc_sigpending(); | |
66 | spin_unlock_irq(¤t->sighand->siglock); | |
67 | ||
68 | REF_REG_RET = -EINTR; | |
69 | while (1) { | |
70 | current->state = TASK_INTERRUPTIBLE; | |
71 | schedule(); | |
72 | regs->pc += 4; /* because sys_sigreturn decrements the pc */ | |
73 | if (do_signal(regs, &saveset)) { | |
74 | /* pc now points at signal handler. Need to decrement | |
75 | it because entry.S will increment it. */ | |
76 | regs->pc -= 4; | |
77 | return -EINTR; | |
78 | } | |
79 | } | |
80 | } | |
81 | ||
82 | asmlinkage int | |
83 | sys_rt_sigsuspend(sigset_t *unewset, size_t sigsetsize, | |
84 | unsigned long r4, unsigned long r5, unsigned long r6, | |
85 | unsigned long r7, | |
86 | struct pt_regs * regs) | |
87 | { | |
88 | sigset_t saveset, newset; | |
89 | ||
90 | /* XXX: Don't preclude handling different sized sigset_t's. */ | |
91 | if (sigsetsize != sizeof(sigset_t)) | |
92 | return -EINVAL; | |
93 | ||
94 | if (copy_from_user(&newset, unewset, sizeof(newset))) | |
95 | return -EFAULT; | |
96 | sigdelsetmask(&newset, ~_BLOCKABLE); | |
97 | spin_lock_irq(¤t->sighand->siglock); | |
98 | saveset = current->blocked; | |
99 | current->blocked = newset; | |
100 | recalc_sigpending(); | |
101 | spin_unlock_irq(¤t->sighand->siglock); | |
102 | ||
103 | REF_REG_RET = -EINTR; | |
104 | while (1) { | |
105 | current->state = TASK_INTERRUPTIBLE; | |
106 | schedule(); | |
107 | regs->pc += 4; /* because sys_sigreturn decrements the pc */ | |
108 | if (do_signal(regs, &saveset)) { | |
109 | /* pc now points at signal handler. Need to decrement | |
110 | it because entry.S will increment it. */ | |
111 | regs->pc -= 4; | |
112 | return -EINTR; | |
113 | } | |
114 | } | |
115 | } | |
116 | ||
117 | asmlinkage int | |
118 | sys_sigaction(int sig, const struct old_sigaction __user *act, | |
119 | struct old_sigaction __user *oact) | |
120 | { | |
121 | struct k_sigaction new_ka, old_ka; | |
122 | int ret; | |
123 | ||
124 | if (act) { | |
125 | old_sigset_t mask; | |
126 | if (!access_ok(VERIFY_READ, act, sizeof(*act)) || | |
127 | __get_user(new_ka.sa.sa_handler, &act->sa_handler) || | |
128 | __get_user(new_ka.sa.sa_restorer, &act->sa_restorer)) | |
129 | return -EFAULT; | |
130 | __get_user(new_ka.sa.sa_flags, &act->sa_flags); | |
131 | __get_user(mask, &act->sa_mask); | |
132 | siginitset(&new_ka.sa.sa_mask, mask); | |
133 | } | |
134 | ||
135 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
136 | ||
137 | if (!ret && oact) { | |
138 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || | |
139 | __put_user(old_ka.sa.sa_handler, &oact->sa_handler) || | |
140 | __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer)) | |
141 | return -EFAULT; | |
142 | __put_user(old_ka.sa.sa_flags, &oact->sa_flags); | |
143 | __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask); | |
144 | } | |
145 | ||
146 | return ret; | |
147 | } | |
148 | ||
149 | asmlinkage int | |
150 | sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss, | |
151 | unsigned long r4, unsigned long r5, unsigned long r6, | |
152 | unsigned long r7, | |
153 | struct pt_regs * regs) | |
154 | { | |
155 | return do_sigaltstack(uss, uoss, REF_REG_SP); | |
156 | } | |
157 | ||
158 | ||
159 | /* | |
160 | * Do a signal return; undo the signal stack. | |
161 | */ | |
162 | ||
163 | struct sigframe | |
164 | { | |
165 | struct sigcontext sc; | |
166 | unsigned long extramask[_NSIG_WORDS-1]; | |
167 | long long retcode[2]; | |
168 | }; | |
169 | ||
170 | struct rt_sigframe | |
171 | { | |
172 | struct siginfo __user *pinfo; | |
173 | void *puc; | |
174 | struct siginfo info; | |
175 | struct ucontext uc; | |
176 | long long retcode[2]; | |
177 | }; | |
178 | ||
179 | #ifdef CONFIG_SH_FPU | |
180 | static inline int | |
181 | restore_sigcontext_fpu(struct pt_regs *regs, struct sigcontext __user *sc) | |
182 | { | |
183 | int err = 0; | |
184 | int fpvalid; | |
185 | ||
186 | err |= __get_user (fpvalid, &sc->sc_fpvalid); | |
187 | conditional_used_math(fpvalid); | |
188 | if (! fpvalid) | |
189 | return err; | |
190 | ||
191 | if (current == last_task_used_math) { | |
192 | last_task_used_math = NULL; | |
193 | regs->sr |= SR_FD; | |
194 | } | |
195 | ||
196 | err |= __copy_from_user(¤t->thread.fpu.hard, &sc->sc_fpregs[0], | |
197 | (sizeof(long long) * 32) + (sizeof(int) * 1)); | |
198 | ||
199 | return err; | |
200 | } | |
201 | ||
202 | static inline int | |
203 | setup_sigcontext_fpu(struct pt_regs *regs, struct sigcontext __user *sc) | |
204 | { | |
205 | int err = 0; | |
206 | int fpvalid; | |
207 | ||
208 | fpvalid = !!used_math(); | |
209 | err |= __put_user(fpvalid, &sc->sc_fpvalid); | |
210 | if (! fpvalid) | |
211 | return err; | |
212 | ||
213 | if (current == last_task_used_math) { | |
214 | grab_fpu(); | |
215 | fpsave(¤t->thread.fpu.hard); | |
216 | release_fpu(); | |
217 | last_task_used_math = NULL; | |
218 | regs->sr |= SR_FD; | |
219 | } | |
220 | ||
221 | err |= __copy_to_user(&sc->sc_fpregs[0], ¤t->thread.fpu.hard, | |
222 | (sizeof(long long) * 32) + (sizeof(int) * 1)); | |
223 | clear_used_math(); | |
224 | ||
225 | return err; | |
226 | } | |
227 | #else | |
228 | static inline int | |
229 | restore_sigcontext_fpu(struct pt_regs *regs, struct sigcontext __user *sc) | |
230 | {} | |
231 | static inline int | |
232 | setup_sigcontext_fpu(struct pt_regs *regs, struct sigcontext __user *sc) | |
233 | {} | |
234 | #endif | |
235 | ||
236 | static int | |
237 | restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, long long *r2_p) | |
238 | { | |
239 | unsigned int err = 0; | |
240 | unsigned long long current_sr, new_sr; | |
241 | #define SR_MASK 0xffff8cfd | |
242 | ||
243 | #define COPY(x) err |= __get_user(regs->x, &sc->sc_##x) | |
244 | ||
245 | COPY(regs[0]); COPY(regs[1]); COPY(regs[2]); COPY(regs[3]); | |
246 | COPY(regs[4]); COPY(regs[5]); COPY(regs[6]); COPY(regs[7]); | |
247 | COPY(regs[8]); COPY(regs[9]); COPY(regs[10]); COPY(regs[11]); | |
248 | COPY(regs[12]); COPY(regs[13]); COPY(regs[14]); COPY(regs[15]); | |
249 | COPY(regs[16]); COPY(regs[17]); COPY(regs[18]); COPY(regs[19]); | |
250 | COPY(regs[20]); COPY(regs[21]); COPY(regs[22]); COPY(regs[23]); | |
251 | COPY(regs[24]); COPY(regs[25]); COPY(regs[26]); COPY(regs[27]); | |
252 | COPY(regs[28]); COPY(regs[29]); COPY(regs[30]); COPY(regs[31]); | |
253 | COPY(regs[32]); COPY(regs[33]); COPY(regs[34]); COPY(regs[35]); | |
254 | COPY(regs[36]); COPY(regs[37]); COPY(regs[38]); COPY(regs[39]); | |
255 | COPY(regs[40]); COPY(regs[41]); COPY(regs[42]); COPY(regs[43]); | |
256 | COPY(regs[44]); COPY(regs[45]); COPY(regs[46]); COPY(regs[47]); | |
257 | COPY(regs[48]); COPY(regs[49]); COPY(regs[50]); COPY(regs[51]); | |
258 | COPY(regs[52]); COPY(regs[53]); COPY(regs[54]); COPY(regs[55]); | |
259 | COPY(regs[56]); COPY(regs[57]); COPY(regs[58]); COPY(regs[59]); | |
260 | COPY(regs[60]); COPY(regs[61]); COPY(regs[62]); | |
261 | COPY(tregs[0]); COPY(tregs[1]); COPY(tregs[2]); COPY(tregs[3]); | |
262 | COPY(tregs[4]); COPY(tregs[5]); COPY(tregs[6]); COPY(tregs[7]); | |
263 | ||
264 | /* Prevent the signal handler manipulating SR in a way that can | |
265 | crash the kernel. i.e. only allow S, Q, M, PR, SZ, FR to be | |
266 | modified */ | |
267 | current_sr = regs->sr; | |
268 | err |= __get_user(new_sr, &sc->sc_sr); | |
269 | regs->sr &= SR_MASK; | |
270 | regs->sr |= (new_sr & ~SR_MASK); | |
271 | ||
272 | COPY(pc); | |
273 | ||
274 | #undef COPY | |
275 | ||
276 | /* Must do this last in case it sets regs->sr.fd (i.e. after rest of sr | |
277 | * has been restored above.) */ | |
278 | err |= restore_sigcontext_fpu(regs, sc); | |
279 | ||
280 | regs->syscall_nr = -1; /* disable syscall checks */ | |
281 | err |= __get_user(*r2_p, &sc->sc_regs[REG_RET]); | |
282 | return err; | |
283 | } | |
284 | ||
285 | asmlinkage int sys_sigreturn(unsigned long r2, unsigned long r3, | |
286 | unsigned long r4, unsigned long r5, | |
287 | unsigned long r6, unsigned long r7, | |
288 | struct pt_regs * regs) | |
289 | { | |
290 | struct sigframe __user *frame = (struct sigframe __user *) (long) REF_REG_SP; | |
291 | sigset_t set; | |
292 | long long ret; | |
293 | ||
294 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
295 | goto badframe; | |
296 | ||
297 | if (__get_user(set.sig[0], &frame->sc.oldmask) | |
298 | || (_NSIG_WORDS > 1 | |
299 | && __copy_from_user(&set.sig[1], &frame->extramask, | |
300 | sizeof(frame->extramask)))) | |
301 | goto badframe; | |
302 | ||
303 | sigdelsetmask(&set, ~_BLOCKABLE); | |
304 | ||
305 | spin_lock_irq(¤t->sighand->siglock); | |
306 | current->blocked = set; | |
307 | recalc_sigpending(); | |
308 | spin_unlock_irq(¤t->sighand->siglock); | |
309 | ||
310 | if (restore_sigcontext(regs, &frame->sc, &ret)) | |
311 | goto badframe; | |
312 | regs->pc -= 4; | |
313 | ||
314 | return (int) ret; | |
315 | ||
316 | badframe: | |
317 | force_sig(SIGSEGV, current); | |
318 | return 0; | |
319 | } | |
320 | ||
321 | asmlinkage int sys_rt_sigreturn(unsigned long r2, unsigned long r3, | |
322 | unsigned long r4, unsigned long r5, | |
323 | unsigned long r6, unsigned long r7, | |
324 | struct pt_regs * regs) | |
325 | { | |
326 | struct rt_sigframe __user *frame = (struct rt_sigframe __user *) (long) REF_REG_SP; | |
327 | sigset_t set; | |
328 | stack_t __user st; | |
329 | long long ret; | |
330 | ||
331 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
332 | goto badframe; | |
333 | ||
334 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) | |
335 | goto badframe; | |
336 | ||
337 | sigdelsetmask(&set, ~_BLOCKABLE); | |
338 | spin_lock_irq(¤t->sighand->siglock); | |
339 | current->blocked = set; | |
340 | recalc_sigpending(); | |
341 | spin_unlock_irq(¤t->sighand->siglock); | |
342 | ||
343 | if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &ret)) | |
344 | goto badframe; | |
345 | regs->pc -= 4; | |
346 | ||
347 | if (__copy_from_user(&st, &frame->uc.uc_stack, sizeof(st))) | |
348 | goto badframe; | |
349 | /* It is more difficult to avoid calling this function than to | |
350 | call it and ignore errors. */ | |
351 | do_sigaltstack(&st, NULL, REF_REG_SP); | |
352 | ||
353 | return (int) ret; | |
354 | ||
355 | badframe: | |
356 | force_sig(SIGSEGV, current); | |
357 | return 0; | |
358 | } | |
359 | ||
360 | /* | |
361 | * Set up a signal frame. | |
362 | */ | |
363 | ||
364 | static int | |
365 | setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, | |
366 | unsigned long mask) | |
367 | { | |
368 | int err = 0; | |
369 | ||
370 | /* Do this first, otherwise is this sets sr->fd, that value isn't preserved. */ | |
371 | err |= setup_sigcontext_fpu(regs, sc); | |
372 | ||
373 | #define COPY(x) err |= __put_user(regs->x, &sc->sc_##x) | |
374 | ||
375 | COPY(regs[0]); COPY(regs[1]); COPY(regs[2]); COPY(regs[3]); | |
376 | COPY(regs[4]); COPY(regs[5]); COPY(regs[6]); COPY(regs[7]); | |
377 | COPY(regs[8]); COPY(regs[9]); COPY(regs[10]); COPY(regs[11]); | |
378 | COPY(regs[12]); COPY(regs[13]); COPY(regs[14]); COPY(regs[15]); | |
379 | COPY(regs[16]); COPY(regs[17]); COPY(regs[18]); COPY(regs[19]); | |
380 | COPY(regs[20]); COPY(regs[21]); COPY(regs[22]); COPY(regs[23]); | |
381 | COPY(regs[24]); COPY(regs[25]); COPY(regs[26]); COPY(regs[27]); | |
382 | COPY(regs[28]); COPY(regs[29]); COPY(regs[30]); COPY(regs[31]); | |
383 | COPY(regs[32]); COPY(regs[33]); COPY(regs[34]); COPY(regs[35]); | |
384 | COPY(regs[36]); COPY(regs[37]); COPY(regs[38]); COPY(regs[39]); | |
385 | COPY(regs[40]); COPY(regs[41]); COPY(regs[42]); COPY(regs[43]); | |
386 | COPY(regs[44]); COPY(regs[45]); COPY(regs[46]); COPY(regs[47]); | |
387 | COPY(regs[48]); COPY(regs[49]); COPY(regs[50]); COPY(regs[51]); | |
388 | COPY(regs[52]); COPY(regs[53]); COPY(regs[54]); COPY(regs[55]); | |
389 | COPY(regs[56]); COPY(regs[57]); COPY(regs[58]); COPY(regs[59]); | |
390 | COPY(regs[60]); COPY(regs[61]); COPY(regs[62]); | |
391 | COPY(tregs[0]); COPY(tregs[1]); COPY(tregs[2]); COPY(tregs[3]); | |
392 | COPY(tregs[4]); COPY(tregs[5]); COPY(tregs[6]); COPY(tregs[7]); | |
393 | COPY(sr); COPY(pc); | |
394 | ||
395 | #undef COPY | |
396 | ||
397 | err |= __put_user(mask, &sc->oldmask); | |
398 | ||
399 | return err; | |
400 | } | |
401 | ||
402 | /* | |
403 | * Determine which stack to use.. | |
404 | */ | |
405 | static inline void __user * | |
406 | get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size) | |
407 | { | |
d09042da | 408 | if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && ! sas_ss_flags(sp)) |
1da177e4 LT |
409 | sp = current->sas_ss_sp + current->sas_ss_size; |
410 | ||
411 | return (void __user *)((sp - frame_size) & -8ul); | |
412 | } | |
413 | ||
414 | void sa_default_restorer(void); /* See comments below */ | |
415 | void sa_default_rt_restorer(void); /* See comments below */ | |
416 | ||
417 | static void setup_frame(int sig, struct k_sigaction *ka, | |
418 | sigset_t *set, struct pt_regs *regs) | |
419 | { | |
420 | struct sigframe __user *frame; | |
421 | int err = 0; | |
422 | int signal; | |
423 | ||
424 | frame = get_sigframe(ka, regs->regs[REG_SP], sizeof(*frame)); | |
425 | ||
426 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
427 | goto give_sigsegv; | |
428 | ||
429 | signal = current_thread_info()->exec_domain | |
430 | && current_thread_info()->exec_domain->signal_invmap | |
431 | && sig < 32 | |
432 | ? current_thread_info()->exec_domain->signal_invmap[sig] | |
433 | : sig; | |
434 | ||
435 | err |= setup_sigcontext(&frame->sc, regs, set->sig[0]); | |
436 | ||
437 | /* Give up earlier as i386, in case */ | |
438 | if (err) | |
439 | goto give_sigsegv; | |
440 | ||
441 | if (_NSIG_WORDS > 1) { | |
442 | err |= __copy_to_user(frame->extramask, &set->sig[1], | |
443 | sizeof(frame->extramask)); } | |
444 | ||
445 | /* Give up earlier as i386, in case */ | |
446 | if (err) | |
447 | goto give_sigsegv; | |
448 | ||
449 | /* Set up to return from userspace. If provided, use a stub | |
450 | already in userspace. */ | |
451 | if (ka->sa.sa_flags & SA_RESTORER) { | |
452 | DEREF_REG_PR = (unsigned long) ka->sa.sa_restorer | 0x1; | |
453 | ||
454 | /* | |
455 | * On SH5 all edited pointers are subject to NEFF | |
456 | */ | |
457 | DEREF_REG_PR = (DEREF_REG_PR & NEFF_SIGN) ? | |
458 | (DEREF_REG_PR | NEFF_MASK) : DEREF_REG_PR; | |
459 | } else { | |
460 | /* | |
461 | * Different approach on SH5. | |
462 | * . Endianness independent asm code gets placed in entry.S . | |
463 | * This is limited to four ASM instructions corresponding | |
464 | * to two long longs in size. | |
465 | * . err checking is done on the else branch only | |
466 | * . flush_icache_range() is called upon __put_user() only | |
467 | * . all edited pointers are subject to NEFF | |
468 | * . being code, linker turns ShMedia bit on, always | |
469 | * dereference index -1. | |
470 | */ | |
471 | DEREF_REG_PR = (unsigned long) frame->retcode | 0x01; | |
472 | DEREF_REG_PR = (DEREF_REG_PR & NEFF_SIGN) ? | |
473 | (DEREF_REG_PR | NEFF_MASK) : DEREF_REG_PR; | |
474 | ||
475 | if (__copy_to_user(frame->retcode, | |
476 | (unsigned long long)sa_default_restorer & (~1), 16) != 0) | |
477 | goto give_sigsegv; | |
478 | ||
479 | /* Cohere the trampoline with the I-cache. */ | |
480 | flush_cache_sigtramp(DEREF_REG_PR-1, DEREF_REG_PR-1+16); | |
481 | } | |
482 | ||
483 | /* | |
484 | * Set up registers for signal handler. | |
485 | * All edited pointers are subject to NEFF. | |
486 | */ | |
487 | regs->regs[REG_SP] = (unsigned long) frame; | |
488 | regs->regs[REG_SP] = (regs->regs[REG_SP] & NEFF_SIGN) ? | |
489 | (regs->regs[REG_SP] | NEFF_MASK) : regs->regs[REG_SP]; | |
490 | regs->regs[REG_ARG1] = signal; /* Arg for signal handler */ | |
491 | ||
492 | /* FIXME: | |
493 | The glibc profiling support for SH-5 needs to be passed a sigcontext | |
494 | so it can retrieve the PC. At some point during 2003 the glibc | |
495 | support was changed to receive the sigcontext through the 2nd | |
496 | argument, but there are still versions of libc.so in use that use | |
497 | the 3rd argument. Until libc.so is stabilised, pass the sigcontext | |
498 | through both 2nd and 3rd arguments. | |
499 | */ | |
500 | ||
501 | regs->regs[REG_ARG2] = (unsigned long long)(unsigned long)(signed long)&frame->sc; | |
502 | regs->regs[REG_ARG3] = (unsigned long long)(unsigned long)(signed long)&frame->sc; | |
503 | ||
504 | regs->pc = (unsigned long) ka->sa.sa_handler; | |
505 | regs->pc = (regs->pc & NEFF_SIGN) ? (regs->pc | NEFF_MASK) : regs->pc; | |
506 | ||
507 | set_fs(USER_DS); | |
508 | ||
509 | #if DEBUG_SIG | |
510 | /* Broken %016Lx */ | |
511 | printk("SIG deliver (#%d,%s:%d): sp=%p pc=%08Lx%08Lx link=%08Lx%08Lx\n", | |
512 | signal, | |
513 | current->comm, current->pid, frame, | |
514 | regs->pc >> 32, regs->pc & 0xffffffff, | |
515 | DEREF_REG_PR >> 32, DEREF_REG_PR & 0xffffffff); | |
516 | #endif | |
517 | ||
518 | return; | |
519 | ||
520 | give_sigsegv: | |
521 | force_sigsegv(sig, current); | |
522 | } | |
523 | ||
524 | static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, | |
525 | sigset_t *set, struct pt_regs *regs) | |
526 | { | |
527 | struct rt_sigframe __user *frame; | |
528 | int err = 0; | |
529 | int signal; | |
530 | ||
531 | frame = get_sigframe(ka, regs->regs[REG_SP], sizeof(*frame)); | |
532 | ||
533 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
534 | goto give_sigsegv; | |
535 | ||
536 | signal = current_thread_info()->exec_domain | |
537 | && current_thread_info()->exec_domain->signal_invmap | |
538 | && sig < 32 | |
539 | ? current_thread_info()->exec_domain->signal_invmap[sig] | |
540 | : sig; | |
541 | ||
542 | err |= __put_user(&frame->info, &frame->pinfo); | |
543 | err |= __put_user(&frame->uc, &frame->puc); | |
544 | err |= copy_siginfo_to_user(&frame->info, info); | |
545 | ||
546 | /* Give up earlier as i386, in case */ | |
547 | if (err) | |
548 | goto give_sigsegv; | |
549 | ||
550 | /* Create the ucontext. */ | |
551 | err |= __put_user(0, &frame->uc.uc_flags); | |
552 | err |= __put_user(0, &frame->uc.uc_link); | |
553 | err |= __put_user((void *)current->sas_ss_sp, | |
554 | &frame->uc.uc_stack.ss_sp); | |
555 | err |= __put_user(sas_ss_flags(regs->regs[REG_SP]), | |
556 | &frame->uc.uc_stack.ss_flags); | |
557 | err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size); | |
558 | err |= setup_sigcontext(&frame->uc.uc_mcontext, | |
559 | regs, set->sig[0]); | |
560 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); | |
561 | ||
562 | /* Give up earlier as i386, in case */ | |
563 | if (err) | |
564 | goto give_sigsegv; | |
565 | ||
566 | /* Set up to return from userspace. If provided, use a stub | |
567 | already in userspace. */ | |
568 | if (ka->sa.sa_flags & SA_RESTORER) { | |
569 | DEREF_REG_PR = (unsigned long) ka->sa.sa_restorer | 0x1; | |
570 | ||
571 | /* | |
572 | * On SH5 all edited pointers are subject to NEFF | |
573 | */ | |
574 | DEREF_REG_PR = (DEREF_REG_PR & NEFF_SIGN) ? | |
575 | (DEREF_REG_PR | NEFF_MASK) : DEREF_REG_PR; | |
576 | } else { | |
577 | /* | |
578 | * Different approach on SH5. | |
579 | * . Endianness independent asm code gets placed in entry.S . | |
580 | * This is limited to four ASM instructions corresponding | |
581 | * to two long longs in size. | |
582 | * . err checking is done on the else branch only | |
583 | * . flush_icache_range() is called upon __put_user() only | |
584 | * . all edited pointers are subject to NEFF | |
585 | * . being code, linker turns ShMedia bit on, always | |
586 | * dereference index -1. | |
587 | */ | |
588 | ||
589 | DEREF_REG_PR = (unsigned long) frame->retcode | 0x01; | |
590 | DEREF_REG_PR = (DEREF_REG_PR & NEFF_SIGN) ? | |
591 | (DEREF_REG_PR | NEFF_MASK) : DEREF_REG_PR; | |
592 | ||
593 | if (__copy_to_user(frame->retcode, | |
594 | (unsigned long long)sa_default_rt_restorer & (~1), 16) != 0) | |
595 | goto give_sigsegv; | |
596 | ||
597 | flush_icache_range(DEREF_REG_PR-1, DEREF_REG_PR-1+15); | |
598 | } | |
599 | ||
600 | /* | |
601 | * Set up registers for signal handler. | |
602 | * All edited pointers are subject to NEFF. | |
603 | */ | |
604 | regs->regs[REG_SP] = (unsigned long) frame; | |
605 | regs->regs[REG_SP] = (regs->regs[REG_SP] & NEFF_SIGN) ? | |
606 | (regs->regs[REG_SP] | NEFF_MASK) : regs->regs[REG_SP]; | |
607 | regs->regs[REG_ARG1] = signal; /* Arg for signal handler */ | |
608 | regs->regs[REG_ARG2] = (unsigned long long)(unsigned long)(signed long)&frame->info; | |
609 | regs->regs[REG_ARG3] = (unsigned long long)(unsigned long)(signed long)&frame->uc.uc_mcontext; | |
610 | regs->pc = (unsigned long) ka->sa.sa_handler; | |
611 | regs->pc = (regs->pc & NEFF_SIGN) ? (regs->pc | NEFF_MASK) : regs->pc; | |
612 | ||
613 | set_fs(USER_DS); | |
614 | ||
615 | #if DEBUG_SIG | |
616 | /* Broken %016Lx */ | |
617 | printk("SIG deliver (#%d,%s:%d): sp=%p pc=%08Lx%08Lx link=%08Lx%08Lx\n", | |
618 | signal, | |
619 | current->comm, current->pid, frame, | |
620 | regs->pc >> 32, regs->pc & 0xffffffff, | |
621 | DEREF_REG_PR >> 32, DEREF_REG_PR & 0xffffffff); | |
622 | #endif | |
623 | ||
624 | return; | |
625 | ||
626 | give_sigsegv: | |
627 | force_sigsegv(sig, current); | |
628 | } | |
629 | ||
630 | /* | |
631 | * OK, we're invoking a handler | |
632 | */ | |
633 | ||
634 | static void | |
635 | handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka, | |
636 | sigset_t *oldset, struct pt_regs * regs) | |
637 | { | |
638 | /* Are we from a system call? */ | |
639 | if (regs->syscall_nr >= 0) { | |
640 | /* If so, check system call restarting.. */ | |
641 | switch (regs->regs[REG_RET]) { | |
e227e8f3 | 642 | case -ERESTART_RESTARTBLOCK: |
1da177e4 LT |
643 | case -ERESTARTNOHAND: |
644 | regs->regs[REG_RET] = -EINTR; | |
645 | break; | |
646 | ||
647 | case -ERESTARTSYS: | |
648 | if (!(ka->sa.sa_flags & SA_RESTART)) { | |
649 | regs->regs[REG_RET] = -EINTR; | |
650 | break; | |
651 | } | |
652 | /* fallthrough */ | |
653 | case -ERESTARTNOINTR: | |
654 | /* Decode syscall # */ | |
655 | regs->regs[REG_RET] = regs->syscall_nr; | |
656 | regs->pc -= 4; | |
657 | } | |
658 | } | |
659 | ||
660 | /* Set up the stack frame */ | |
661 | if (ka->sa.sa_flags & SA_SIGINFO) | |
662 | setup_rt_frame(sig, ka, info, oldset, regs); | |
663 | else | |
664 | setup_frame(sig, ka, oldset, regs); | |
665 | ||
69be8f18 SR |
666 | spin_lock_irq(¤t->sighand->siglock); |
667 | sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); | |
668 | if (!(ka->sa.sa_flags & SA_NODEFER)) | |
1da177e4 | 669 | sigaddset(¤t->blocked,sig); |
69be8f18 SR |
670 | recalc_sigpending(); |
671 | spin_unlock_irq(¤t->sighand->siglock); | |
1da177e4 LT |
672 | } |
673 | ||
674 | /* | |
675 | * Note that 'init' is a special process: it doesn't get signals it doesn't | |
676 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
677 | * mistake. | |
678 | * | |
679 | * Note that we go through the signals twice: once to check the signals that | |
680 | * the kernel can handle, and then we build all the user-level signal handling | |
681 | * stack-frames in one go after that. | |
682 | */ | |
683 | int do_signal(struct pt_regs *regs, sigset_t *oldset) | |
684 | { | |
685 | siginfo_t info; | |
686 | int signr; | |
687 | struct k_sigaction ka; | |
688 | ||
689 | /* | |
690 | * We want the common case to go fast, which | |
691 | * is why we may in certain cases get here from | |
692 | * kernel mode. Just return without doing anything | |
693 | * if so. | |
694 | */ | |
695 | if (!user_mode(regs)) | |
696 | return 1; | |
697 | ||
0e6c1f5f | 698 | if (try_to_freeze()) |
1da177e4 LT |
699 | goto no_signal; |
700 | ||
c18fe9a0 PM |
701 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) |
702 | oldset = ¤t->saved_sigmask; | |
703 | else if (!oldset) | |
1da177e4 LT |
704 | oldset = ¤t->blocked; |
705 | ||
706 | signr = get_signal_to_deliver(&info, &ka, regs, 0); | |
707 | ||
708 | if (signr > 0) { | |
709 | /* Whee! Actually deliver the signal. */ | |
710 | handle_signal(signr, &info, &ka, oldset, regs); | |
c18fe9a0 PM |
711 | |
712 | /* | |
713 | * If a signal was successfully delivered, the saved sigmask | |
714 | * is in its frame, and we can clear the TIF_RESTORE_SIGMASK | |
715 | * flag. | |
716 | */ | |
717 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) | |
718 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
719 | ||
1da177e4 LT |
720 | return 1; |
721 | } | |
722 | ||
723 | no_signal: | |
724 | /* Did we come from a system call? */ | |
725 | if (regs->syscall_nr >= 0) { | |
726 | /* Restart the system call - no handlers present */ | |
c18fe9a0 PM |
727 | switch (regs->regs[REG_RET]) { |
728 | case -ERESTARTNOHAND: | |
729 | case -ERESTARTSYS: | |
730 | case -ERESTARTNOINTR: | |
1da177e4 LT |
731 | /* Decode Syscall # */ |
732 | regs->regs[REG_RET] = regs->syscall_nr; | |
733 | regs->pc -= 4; | |
c18fe9a0 PM |
734 | break; |
735 | ||
736 | case -ERESTART_RESTARTBLOCK: | |
737 | regs->regs[REG_RET] = __NR_restart_syscall; | |
738 | regs->pc -= 4; | |
739 | break; | |
1da177e4 LT |
740 | } |
741 | } | |
c18fe9a0 PM |
742 | |
743 | /* No signal to deliver -- put the saved sigmask back */ | |
744 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) { | |
745 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
746 | sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); | |
747 | } | |
748 | ||
1da177e4 LT |
749 | return 0; |
750 | } |