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