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b920de1b DH |
1 | /* MN10300 Signal handling |
2 | * | |
3 | * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. | |
4 | * Written by David Howells (dhowells@redhat.com) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public Licence | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the Licence, or (at your option) any later version. | |
10 | */ | |
11 | ||
12 | #include <linux/sched.h> | |
13 | #include <linux/mm.h> | |
14 | #include <linux/smp.h> | |
b920de1b DH |
15 | #include <linux/kernel.h> |
16 | #include <linux/signal.h> | |
17 | #include <linux/errno.h> | |
18 | #include <linux/wait.h> | |
19 | #include <linux/ptrace.h> | |
20 | #include <linux/unistd.h> | |
21 | #include <linux/stddef.h> | |
22 | #include <linux/tty.h> | |
23 | #include <linux/personality.h> | |
24 | #include <linux/suspend.h> | |
5d289964 | 25 | #include <linux/tracehook.h> |
b920de1b DH |
26 | #include <asm/cacheflush.h> |
27 | #include <asm/ucontext.h> | |
28 | #include <asm/uaccess.h> | |
29 | #include <asm/fpu.h> | |
30 | #include "sigframe.h" | |
31 | ||
32 | #define DEBUG_SIG 0 | |
33 | ||
b920de1b DH |
34 | /* |
35 | * atomically swap in the new signal mask, and wait for a signal. | |
36 | */ | |
37 | asmlinkage long sys_sigsuspend(int history0, int history1, old_sigset_t mask) | |
38 | { | |
68f3f16d AV |
39 | sigset_t blocked; |
40 | siginitset(&blocked, mask); | |
41 | return sigsuspend(&blocked); | |
b920de1b DH |
42 | } |
43 | ||
44 | /* | |
45 | * set signal action syscall | |
46 | */ | |
47 | asmlinkage long sys_sigaction(int sig, | |
48 | const struct old_sigaction __user *act, | |
49 | struct old_sigaction __user *oact) | |
50 | { | |
51 | struct k_sigaction new_ka, old_ka; | |
52 | int ret; | |
53 | ||
54 | if (act) { | |
55 | old_sigset_t mask; | |
56 | if (verify_area(VERIFY_READ, act, sizeof(*act)) || | |
57 | __get_user(new_ka.sa.sa_handler, &act->sa_handler) || | |
60bdb72e AV |
58 | __get_user(new_ka.sa.sa_restorer, &act->sa_restorer) || |
59 | __get_user(new_ka.sa.sa_flags, &act->sa_flags) || | |
60 | __get_user(mask, &act->sa_mask)) | |
b920de1b | 61 | return -EFAULT; |
b920de1b DH |
62 | siginitset(&new_ka.sa.sa_mask, mask); |
63 | } | |
64 | ||
65 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
66 | ||
67 | if (!ret && oact) { | |
68 | if (verify_area(VERIFY_WRITE, oact, sizeof(*oact)) || | |
69 | __put_user(old_ka.sa.sa_handler, &oact->sa_handler) || | |
60bdb72e AV |
70 | __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer) || |
71 | __put_user(old_ka.sa.sa_flags, &oact->sa_flags) || | |
72 | __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask)) | |
b920de1b | 73 | return -EFAULT; |
b920de1b DH |
74 | } |
75 | ||
76 | return ret; | |
77 | } | |
78 | ||
79 | /* | |
80 | * set alternate signal stack syscall | |
81 | */ | |
82 | asmlinkage long sys_sigaltstack(const stack_t __user *uss, stack_t *uoss) | |
83 | { | |
7c7fcf76 | 84 | return do_sigaltstack(uss, uoss, current_frame()->sp); |
b920de1b DH |
85 | } |
86 | ||
87 | /* | |
88 | * do a signal return; undo the signal stack. | |
89 | */ | |
90 | static int restore_sigcontext(struct pt_regs *regs, | |
91 | struct sigcontext __user *sc, long *_d0) | |
92 | { | |
93 | unsigned int err = 0; | |
94 | ||
c05628b4 AV |
95 | /* Always make any pending restarted system calls return -EINTR */ |
96 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
97 | ||
b920de1b DH |
98 | if (is_using_fpu(current)) |
99 | fpu_kill_state(current); | |
100 | ||
101 | #define COPY(x) err |= __get_user(regs->x, &sc->x) | |
102 | COPY(d1); COPY(d2); COPY(d3); | |
103 | COPY(a0); COPY(a1); COPY(a2); COPY(a3); | |
104 | COPY(e0); COPY(e1); COPY(e2); COPY(e3); | |
105 | COPY(e4); COPY(e5); COPY(e6); COPY(e7); | |
106 | COPY(lar); COPY(lir); | |
107 | COPY(mdr); COPY(mdrq); | |
108 | COPY(mcvf); COPY(mcrl); COPY(mcrh); | |
109 | COPY(sp); COPY(pc); | |
110 | #undef COPY | |
111 | ||
112 | { | |
113 | unsigned int tmpflags; | |
114 | #ifndef CONFIG_MN10300_USING_JTAG | |
115 | #define USER_EPSW (EPSW_FLAG_Z | EPSW_FLAG_N | EPSW_FLAG_C | EPSW_FLAG_V | \ | |
116 | EPSW_T | EPSW_nAR) | |
117 | #else | |
118 | #define USER_EPSW (EPSW_FLAG_Z | EPSW_FLAG_N | EPSW_FLAG_C | EPSW_FLAG_V | \ | |
119 | EPSW_nAR) | |
120 | #endif | |
121 | err |= __get_user(tmpflags, &sc->epsw); | |
122 | regs->epsw = (regs->epsw & ~USER_EPSW) | | |
123 | (tmpflags & USER_EPSW); | |
124 | regs->orig_d0 = -1; /* disable syscall checks */ | |
125 | } | |
126 | ||
127 | { | |
128 | struct fpucontext *buf; | |
129 | err |= __get_user(buf, &sc->fpucontext); | |
130 | if (buf) { | |
131 | if (verify_area(VERIFY_READ, buf, sizeof(*buf))) | |
132 | goto badframe; | |
133 | err |= fpu_restore_sigcontext(buf); | |
134 | } | |
135 | } | |
136 | ||
137 | err |= __get_user(*_d0, &sc->d0); | |
138 | return err; | |
139 | ||
140 | badframe: | |
141 | return 1; | |
142 | } | |
143 | ||
144 | /* | |
145 | * standard signal return syscall | |
146 | */ | |
147 | asmlinkage long sys_sigreturn(void) | |
148 | { | |
7c7fcf76 | 149 | struct sigframe __user *frame; |
b920de1b DH |
150 | sigset_t set; |
151 | long d0; | |
152 | ||
7c7fcf76 | 153 | frame = (struct sigframe __user *) current_frame()->sp; |
b920de1b DH |
154 | if (verify_area(VERIFY_READ, frame, sizeof(*frame))) |
155 | goto badframe; | |
156 | if (__get_user(set.sig[0], &frame->sc.oldmask)) | |
157 | goto badframe; | |
158 | ||
159 | if (_NSIG_WORDS > 1 && | |
160 | __copy_from_user(&set.sig[1], &frame->extramask, | |
161 | sizeof(frame->extramask))) | |
162 | goto badframe; | |
163 | ||
00f35785 | 164 | set_current_blocked(&set); |
b920de1b | 165 | |
7c7fcf76 | 166 | if (restore_sigcontext(current_frame(), &frame->sc, &d0)) |
b920de1b DH |
167 | goto badframe; |
168 | ||
169 | return d0; | |
170 | ||
171 | badframe: | |
172 | force_sig(SIGSEGV, current); | |
173 | return 0; | |
174 | } | |
175 | ||
176 | /* | |
177 | * realtime signal return syscall | |
178 | */ | |
179 | asmlinkage long sys_rt_sigreturn(void) | |
180 | { | |
7c7fcf76 | 181 | struct rt_sigframe __user *frame; |
b920de1b | 182 | sigset_t set; |
7c7fcf76 | 183 | long d0; |
b920de1b | 184 | |
7c7fcf76 | 185 | frame = (struct rt_sigframe __user *) current_frame()->sp; |
b920de1b DH |
186 | if (verify_area(VERIFY_READ, frame, sizeof(*frame))) |
187 | goto badframe; | |
188 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) | |
189 | goto badframe; | |
190 | ||
00f35785 | 191 | set_current_blocked(&set); |
b920de1b | 192 | |
7c7fcf76 | 193 | if (restore_sigcontext(current_frame(), &frame->uc.uc_mcontext, &d0)) |
b920de1b DH |
194 | goto badframe; |
195 | ||
7c7fcf76 DH |
196 | if (do_sigaltstack(&frame->uc.uc_stack, NULL, current_frame()->sp) == |
197 | -EFAULT) | |
b920de1b DH |
198 | goto badframe; |
199 | ||
200 | return d0; | |
201 | ||
202 | badframe: | |
203 | force_sig(SIGSEGV, current); | |
204 | return 0; | |
205 | } | |
206 | ||
207 | /* | |
208 | * store the userspace context into a signal frame | |
209 | */ | |
210 | static int setup_sigcontext(struct sigcontext __user *sc, | |
211 | struct fpucontext *fpuctx, | |
212 | struct pt_regs *regs, | |
213 | unsigned long mask) | |
214 | { | |
215 | int tmp, err = 0; | |
216 | ||
217 | #define COPY(x) err |= __put_user(regs->x, &sc->x) | |
218 | COPY(d0); COPY(d1); COPY(d2); COPY(d3); | |
219 | COPY(a0); COPY(a1); COPY(a2); COPY(a3); | |
220 | COPY(e0); COPY(e1); COPY(e2); COPY(e3); | |
221 | COPY(e4); COPY(e5); COPY(e6); COPY(e7); | |
222 | COPY(lar); COPY(lir); | |
223 | COPY(mdr); COPY(mdrq); | |
224 | COPY(mcvf); COPY(mcrl); COPY(mcrh); | |
225 | COPY(sp); COPY(epsw); COPY(pc); | |
226 | #undef COPY | |
227 | ||
228 | tmp = fpu_setup_sigcontext(fpuctx); | |
229 | if (tmp < 0) | |
230 | err = 1; | |
231 | else | |
232 | err |= __put_user(tmp ? fpuctx : NULL, &sc->fpucontext); | |
233 | ||
234 | /* non-iBCS2 extensions.. */ | |
235 | err |= __put_user(mask, &sc->oldmask); | |
236 | ||
237 | return err; | |
238 | } | |
239 | ||
240 | /* | |
241 | * determine which stack to use.. | |
242 | */ | |
243 | static inline void __user *get_sigframe(struct k_sigaction *ka, | |
244 | struct pt_regs *regs, | |
245 | size_t frame_size) | |
246 | { | |
247 | unsigned long sp; | |
248 | ||
249 | /* default to using normal stack */ | |
250 | sp = regs->sp; | |
251 | ||
252 | /* this is the X/Open sanctioned signal stack switching. */ | |
253 | if (ka->sa.sa_flags & SA_ONSTACK) { | |
4c03ee73 | 254 | if (sas_ss_flags(sp) == 0) |
b920de1b DH |
255 | sp = current->sas_ss_sp + current->sas_ss_size; |
256 | } | |
257 | ||
258 | return (void __user *) ((sp - frame_size) & ~7UL); | |
259 | } | |
260 | ||
261 | /* | |
262 | * set up a normal signal frame | |
263 | */ | |
264 | static int setup_frame(int sig, struct k_sigaction *ka, sigset_t *set, | |
265 | struct pt_regs *regs) | |
266 | { | |
267 | struct sigframe __user *frame; | |
268 | int rsig; | |
269 | ||
270 | frame = get_sigframe(ka, regs, sizeof(*frame)); | |
271 | ||
272 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
273 | goto give_sigsegv; | |
274 | ||
275 | rsig = sig; | |
276 | if (sig < 32 && | |
277 | current_thread_info()->exec_domain && | |
278 | current_thread_info()->exec_domain->signal_invmap) | |
279 | rsig = current_thread_info()->exec_domain->signal_invmap[sig]; | |
280 | ||
281 | if (__put_user(rsig, &frame->sig) < 0 || | |
282 | __put_user(&frame->sc, &frame->psc) < 0) | |
283 | goto give_sigsegv; | |
284 | ||
285 | if (setup_sigcontext(&frame->sc, &frame->fpuctx, regs, set->sig[0])) | |
286 | goto give_sigsegv; | |
287 | ||
288 | if (_NSIG_WORDS > 1) { | |
289 | if (__copy_to_user(frame->extramask, &set->sig[1], | |
290 | sizeof(frame->extramask))) | |
291 | goto give_sigsegv; | |
292 | } | |
293 | ||
294 | /* set up to return from userspace. If provided, use a stub already in | |
295 | * userspace */ | |
296 | if (ka->sa.sa_flags & SA_RESTORER) { | |
297 | if (__put_user(ka->sa.sa_restorer, &frame->pretcode)) | |
298 | goto give_sigsegv; | |
299 | } else { | |
300 | if (__put_user((void (*)(void))frame->retcode, | |
301 | &frame->pretcode)) | |
302 | goto give_sigsegv; | |
303 | /* this is mov $,d0; syscall 0 */ | |
304 | if (__put_user(0x2c, (char *)(frame->retcode + 0)) || | |
305 | __put_user(__NR_sigreturn, (char *)(frame->retcode + 1)) || | |
306 | __put_user(0x00, (char *)(frame->retcode + 2)) || | |
307 | __put_user(0xf0, (char *)(frame->retcode + 3)) || | |
308 | __put_user(0xe0, (char *)(frame->retcode + 4))) | |
309 | goto give_sigsegv; | |
310 | flush_icache_range((unsigned long) frame->retcode, | |
311 | (unsigned long) frame->retcode + 5); | |
312 | } | |
313 | ||
314 | /* set up registers for signal handler */ | |
315 | regs->sp = (unsigned long) frame; | |
316 | regs->pc = (unsigned long) ka->sa.sa_handler; | |
317 | regs->d0 = sig; | |
318 | regs->d1 = (unsigned long) &frame->sc; | |
319 | ||
b920de1b DH |
320 | #if DEBUG_SIG |
321 | printk(KERN_DEBUG "SIG deliver %d (%s:%d): sp=%p pc=%lx ra=%p\n", | |
322 | sig, current->comm, current->pid, frame, regs->pc, | |
323 | frame->pretcode); | |
324 | #endif | |
325 | ||
326 | return 0; | |
327 | ||
328 | give_sigsegv: | |
e46924d2 | 329 | force_sigsegv(sig, current); |
b920de1b DH |
330 | return -EFAULT; |
331 | } | |
332 | ||
333 | /* | |
334 | * set up a realtime signal frame | |
335 | */ | |
336 | static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, | |
337 | sigset_t *set, struct pt_regs *regs) | |
338 | { | |
339 | struct rt_sigframe __user *frame; | |
340 | int rsig; | |
341 | ||
342 | frame = get_sigframe(ka, regs, sizeof(*frame)); | |
343 | ||
344 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
345 | goto give_sigsegv; | |
346 | ||
347 | rsig = sig; | |
348 | if (sig < 32 && | |
349 | current_thread_info()->exec_domain && | |
350 | current_thread_info()->exec_domain->signal_invmap) | |
351 | rsig = current_thread_info()->exec_domain->signal_invmap[sig]; | |
352 | ||
353 | if (__put_user(rsig, &frame->sig) || | |
354 | __put_user(&frame->info, &frame->pinfo) || | |
355 | __put_user(&frame->uc, &frame->puc) || | |
356 | copy_siginfo_to_user(&frame->info, info)) | |
357 | goto give_sigsegv; | |
358 | ||
359 | /* create the ucontext. */ | |
360 | if (__put_user(0, &frame->uc.uc_flags) || | |
361 | __put_user(0, &frame->uc.uc_link) || | |
362 | __put_user((void *)current->sas_ss_sp, &frame->uc.uc_stack.ss_sp) || | |
363 | __put_user(sas_ss_flags(regs->sp), &frame->uc.uc_stack.ss_flags) || | |
364 | __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size) || | |
365 | setup_sigcontext(&frame->uc.uc_mcontext, | |
366 | &frame->fpuctx, regs, set->sig[0]) || | |
367 | __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set))) | |
368 | goto give_sigsegv; | |
369 | ||
370 | /* set up to return from userspace. If provided, use a stub already in | |
371 | * userspace */ | |
372 | if (ka->sa.sa_flags & SA_RESTORER) { | |
373 | if (__put_user(ka->sa.sa_restorer, &frame->pretcode)) | |
374 | goto give_sigsegv; | |
375 | } else { | |
376 | if (__put_user((void(*)(void))frame->retcode, | |
377 | &frame->pretcode) || | |
378 | /* This is mov $,d0; syscall 0 */ | |
379 | __put_user(0x2c, (char *)(frame->retcode + 0)) || | |
380 | __put_user(__NR_rt_sigreturn, | |
381 | (char *)(frame->retcode + 1)) || | |
382 | __put_user(0x00, (char *)(frame->retcode + 2)) || | |
383 | __put_user(0xf0, (char *)(frame->retcode + 3)) || | |
384 | __put_user(0xe0, (char *)(frame->retcode + 4))) | |
385 | goto give_sigsegv; | |
386 | ||
387 | flush_icache_range((u_long) frame->retcode, | |
388 | (u_long) frame->retcode + 5); | |
389 | } | |
390 | ||
391 | /* Set up registers for signal handler */ | |
392 | regs->sp = (unsigned long) frame; | |
393 | regs->pc = (unsigned long) ka->sa.sa_handler; | |
394 | regs->d0 = sig; | |
395 | regs->d1 = (long) &frame->info; | |
396 | ||
b920de1b DH |
397 | #if DEBUG_SIG |
398 | printk(KERN_DEBUG "SIG deliver %d (%s:%d): sp=%p pc=%lx ra=%p\n", | |
399 | sig, current->comm, current->pid, frame, regs->pc, | |
400 | frame->pretcode); | |
401 | #endif | |
402 | ||
403 | return 0; | |
404 | ||
405 | give_sigsegv: | |
e46924d2 | 406 | force_sigsegv(sig, current); |
b920de1b DH |
407 | return -EFAULT; |
408 | } | |
409 | ||
00cbf608 AV |
410 | static inline void stepback(struct pt_regs *regs) |
411 | { | |
412 | regs->pc -= 2; | |
413 | regs->orig_d0 = -1; | |
414 | } | |
415 | ||
b920de1b DH |
416 | /* |
417 | * handle the actual delivery of a signal to userspace | |
418 | */ | |
419 | static int handle_signal(int sig, | |
420 | siginfo_t *info, struct k_sigaction *ka, | |
b7f9a11a | 421 | struct pt_regs *regs) |
b920de1b | 422 | { |
b7f9a11a | 423 | sigset_t *oldset = sigmask_to_save(); |
b920de1b DH |
424 | int ret; |
425 | ||
426 | /* Are we from a system call? */ | |
427 | if (regs->orig_d0 >= 0) { | |
428 | /* If so, check system call restarting.. */ | |
429 | switch (regs->d0) { | |
430 | case -ERESTART_RESTARTBLOCK: | |
431 | case -ERESTARTNOHAND: | |
432 | regs->d0 = -EINTR; | |
433 | break; | |
434 | ||
435 | case -ERESTARTSYS: | |
436 | if (!(ka->sa.sa_flags & SA_RESTART)) { | |
437 | regs->d0 = -EINTR; | |
438 | break; | |
439 | } | |
440 | ||
441 | /* fallthrough */ | |
442 | case -ERESTARTNOINTR: | |
443 | regs->d0 = regs->orig_d0; | |
00cbf608 | 444 | stepback(regs); |
b920de1b DH |
445 | } |
446 | } | |
447 | ||
448 | /* Set up the stack frame */ | |
449 | if (ka->sa.sa_flags & SA_SIGINFO) | |
450 | ret = setup_rt_frame(sig, ka, info, oldset, regs); | |
451 | else | |
452 | ret = setup_frame(sig, ka, oldset, regs); | |
a610d6e6 | 453 | if (ret) |
b45f9330 | 454 | return ret; |
b920de1b | 455 | |
efee984c | 456 | signal_delivered(sig, info, ka, regs, |
b45f9330 GU |
457 | test_thread_flag(TIF_SINGLESTEP)); |
458 | return 0; | |
b920de1b DH |
459 | } |
460 | ||
461 | /* | |
462 | * handle a potential signal | |
463 | */ | |
464 | static void do_signal(struct pt_regs *regs) | |
465 | { | |
466 | struct k_sigaction ka; | |
467 | siginfo_t info; | |
b920de1b DH |
468 | int signr; |
469 | ||
b920de1b DH |
470 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); |
471 | if (signr > 0) { | |
b7f9a11a | 472 | if (handle_signal(signr, &info, &ka, regs) == 0) { |
b920de1b DH |
473 | } |
474 | ||
475 | return; | |
476 | } | |
477 | ||
478 | /* did we come from a system call? */ | |
479 | if (regs->orig_d0 >= 0) { | |
480 | /* restart the system call - no handlers present */ | |
481 | switch (regs->d0) { | |
482 | case -ERESTARTNOHAND: | |
483 | case -ERESTARTSYS: | |
484 | case -ERESTARTNOINTR: | |
485 | regs->d0 = regs->orig_d0; | |
00cbf608 | 486 | stepback(regs); |
b920de1b DH |
487 | break; |
488 | ||
489 | case -ERESTART_RESTARTBLOCK: | |
490 | regs->d0 = __NR_restart_syscall; | |
00cbf608 | 491 | stepback(regs); |
b920de1b DH |
492 | break; |
493 | } | |
494 | } | |
495 | ||
496 | /* if there's no signal to deliver, we just put the saved sigmask | |
497 | * back */ | |
51a7b448 | 498 | restore_saved_sigmask(); |
b920de1b DH |
499 | } |
500 | ||
501 | /* | |
502 | * notification of userspace execution resumption | |
503 | * - triggered by current->work.notify_resume | |
504 | */ | |
505 | asmlinkage void do_notify_resume(struct pt_regs *regs, u32 thread_info_flags) | |
506 | { | |
507 | /* Pending single-step? */ | |
508 | if (thread_info_flags & _TIF_SINGLESTEP) { | |
509 | #ifndef CONFIG_MN10300_USING_JTAG | |
510 | regs->epsw |= EPSW_T; | |
511 | clear_thread_flag(TIF_SINGLESTEP); | |
512 | #else | |
513 | BUG(); /* no h/w single-step if using JTAG unit */ | |
514 | #endif | |
515 | } | |
516 | ||
517 | /* deal with pending signal delivery */ | |
6fd84c08 | 518 | if (thread_info_flags & _TIF_SIGPENDING) |
b920de1b | 519 | do_signal(regs); |
5d289964 DH |
520 | |
521 | if (thread_info_flags & _TIF_NOTIFY_RESUME) { | |
522 | clear_thread_flag(TIF_NOTIFY_RESUME); | |
7c7fcf76 | 523 | tracehook_notify_resume(current_frame()); |
5d289964 | 524 | } |
b920de1b | 525 | } |