Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/arch/sh/kernel/signal.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992 Linus Torvalds | |
5 | * | |
6 | * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson | |
7 | * | |
8 | * SuperH version: Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima | |
9 | * | |
10 | */ | |
1da177e4 LT |
11 | #include <linux/sched.h> |
12 | #include <linux/mm.h> | |
13 | #include <linux/smp.h> | |
14 | #include <linux/smp_lock.h> | |
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> | |
19f9a34f | 23 | #include <linux/elf.h> |
1da177e4 LT |
24 | #include <linux/personality.h> |
25 | #include <linux/binfmts.h> | |
7dfb7103 | 26 | #include <linux/freezer.h> |
1da177e4 LT |
27 | |
28 | #include <asm/ucontext.h> | |
29 | #include <asm/uaccess.h> | |
30 | #include <asm/pgtable.h> | |
31 | #include <asm/cacheflush.h> | |
32 | ||
1da177e4 LT |
33 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) |
34 | ||
1da177e4 LT |
35 | /* |
36 | * Atomically swap in the new signal mask, and wait for a signal. | |
37 | */ | |
38 | asmlinkage int | |
39 | sys_sigsuspend(old_sigset_t mask, | |
40 | unsigned long r5, unsigned long r6, unsigned long r7, | |
f0bc814c | 41 | struct pt_regs __regs) |
1da177e4 | 42 | { |
1da177e4 LT |
43 | mask &= _BLOCKABLE; |
44 | spin_lock_irq(¤t->sighand->siglock); | |
9f23e7e9 | 45 | current->saved_sigmask = current->blocked; |
1da177e4 LT |
46 | siginitset(¤t->blocked, mask); |
47 | recalc_sigpending(); | |
48 | spin_unlock_irq(¤t->sighand->siglock); | |
49 | ||
9f23e7e9 PM |
50 | current->state = TASK_INTERRUPTIBLE; |
51 | schedule(); | |
52 | set_thread_flag(TIF_RESTORE_SIGMASK); | |
53 | return -ERESTARTNOHAND; | |
1da177e4 LT |
54 | } |
55 | ||
f0bc814c | 56 | asmlinkage int |
1da177e4 LT |
57 | sys_sigaction(int sig, const struct old_sigaction __user *act, |
58 | struct old_sigaction __user *oact) | |
59 | { | |
60 | struct k_sigaction new_ka, old_ka; | |
61 | int ret; | |
62 | ||
63 | if (act) { | |
64 | old_sigset_t mask; | |
65 | if (!access_ok(VERIFY_READ, act, sizeof(*act)) || | |
66 | __get_user(new_ka.sa.sa_handler, &act->sa_handler) || | |
67 | __get_user(new_ka.sa.sa_restorer, &act->sa_restorer)) | |
68 | return -EFAULT; | |
69 | __get_user(new_ka.sa.sa_flags, &act->sa_flags); | |
70 | __get_user(mask, &act->sa_mask); | |
71 | siginitset(&new_ka.sa.sa_mask, mask); | |
72 | } | |
73 | ||
74 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
75 | ||
76 | if (!ret && oact) { | |
77 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || | |
78 | __put_user(old_ka.sa.sa_handler, &oact->sa_handler) || | |
79 | __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer)) | |
80 | return -EFAULT; | |
81 | __put_user(old_ka.sa.sa_flags, &oact->sa_flags); | |
82 | __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask); | |
83 | } | |
84 | ||
85 | return ret; | |
86 | } | |
87 | ||
88 | asmlinkage int | |
89 | sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss, | |
90 | unsigned long r6, unsigned long r7, | |
f0bc814c | 91 | struct pt_regs __regs) |
1da177e4 | 92 | { |
f0bc814c SM |
93 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
94 | ||
95 | return do_sigaltstack(uss, uoss, regs->regs[15]); | |
1da177e4 LT |
96 | } |
97 | ||
98 | ||
99 | /* | |
100 | * Do a signal return; undo the signal stack. | |
101 | */ | |
102 | ||
103 | #define MOVW(n) (0x9300|((n)-2)) /* Move mem word at PC+n to R3 */ | |
9d4436a6 YS |
104 | #if defined(CONFIG_CPU_SH2) || defined(CONFIG_CPU_SH2A) |
105 | #define TRAP_NOARG 0xc320 /* Syscall w/no args (NR in R3) */ | |
106 | #else | |
107 | #define TRAP_NOARG 0xc310 /* Syscall w/no args (NR in R3) */ | |
108 | #endif | |
1da177e4 LT |
109 | #define OR_R0_R0 0x200b /* or r0,r0 (insert to avoid hardware bug) */ |
110 | ||
111 | struct sigframe | |
112 | { | |
113 | struct sigcontext sc; | |
114 | unsigned long extramask[_NSIG_WORDS-1]; | |
115 | u16 retcode[8]; | |
116 | }; | |
117 | ||
118 | struct rt_sigframe | |
119 | { | |
120 | struct siginfo info; | |
121 | struct ucontext uc; | |
122 | u16 retcode[8]; | |
123 | }; | |
124 | ||
125 | #ifdef CONFIG_SH_FPU | |
126 | static inline int restore_sigcontext_fpu(struct sigcontext __user *sc) | |
127 | { | |
128 | struct task_struct *tsk = current; | |
129 | ||
130 | if (!(cpu_data->flags & CPU_HAS_FPU)) | |
131 | return 0; | |
132 | ||
133 | set_used_math(); | |
134 | return __copy_from_user(&tsk->thread.fpu.hard, &sc->sc_fpregs[0], | |
135 | sizeof(long)*(16*2+2)); | |
136 | } | |
137 | ||
138 | static inline int save_sigcontext_fpu(struct sigcontext __user *sc, | |
139 | struct pt_regs *regs) | |
140 | { | |
141 | struct task_struct *tsk = current; | |
142 | ||
143 | if (!(cpu_data->flags & CPU_HAS_FPU)) | |
144 | return 0; | |
145 | ||
146 | if (!used_math()) { | |
147 | __put_user(0, &sc->sc_ownedfp); | |
148 | return 0; | |
149 | } | |
150 | ||
151 | __put_user(1, &sc->sc_ownedfp); | |
152 | ||
153 | /* This will cause a "finit" to be triggered by the next | |
154 | attempted FPU operation by the 'current' process. | |
155 | */ | |
156 | clear_used_math(); | |
157 | ||
158 | unlazy_fpu(tsk, regs); | |
159 | return __copy_to_user(&sc->sc_fpregs[0], &tsk->thread.fpu.hard, | |
160 | sizeof(long)*(16*2+2)); | |
161 | } | |
162 | #endif /* CONFIG_SH_FPU */ | |
163 | ||
164 | static int | |
165 | restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, int *r0_p) | |
166 | { | |
167 | unsigned int err = 0; | |
168 | ||
169 | #define COPY(x) err |= __get_user(regs->x, &sc->sc_##x) | |
170 | COPY(regs[1]); | |
171 | COPY(regs[2]); COPY(regs[3]); | |
172 | COPY(regs[4]); COPY(regs[5]); | |
173 | COPY(regs[6]); COPY(regs[7]); | |
174 | COPY(regs[8]); COPY(regs[9]); | |
175 | COPY(regs[10]); COPY(regs[11]); | |
176 | COPY(regs[12]); COPY(regs[13]); | |
177 | COPY(regs[14]); COPY(regs[15]); | |
178 | COPY(gbr); COPY(mach); | |
179 | COPY(macl); COPY(pr); | |
180 | COPY(sr); COPY(pc); | |
181 | #undef COPY | |
182 | ||
183 | #ifdef CONFIG_SH_FPU | |
184 | if (cpu_data->flags & CPU_HAS_FPU) { | |
185 | int owned_fp; | |
186 | struct task_struct *tsk = current; | |
187 | ||
188 | regs->sr |= SR_FD; /* Release FPU */ | |
189 | clear_fpu(tsk, regs); | |
190 | clear_used_math(); | |
191 | __get_user (owned_fp, &sc->sc_ownedfp); | |
192 | if (owned_fp) | |
193 | err |= restore_sigcontext_fpu(sc); | |
194 | } | |
195 | #endif | |
196 | ||
197 | regs->tra = -1; /* disable syscall checks */ | |
198 | err |= __get_user(*r0_p, &sc->sc_regs[0]); | |
199 | return err; | |
200 | } | |
201 | ||
202 | asmlinkage int sys_sigreturn(unsigned long r4, unsigned long r5, | |
203 | unsigned long r6, unsigned long r7, | |
f0bc814c | 204 | struct pt_regs __regs) |
1da177e4 | 205 | { |
f0bc814c SM |
206 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
207 | struct sigframe __user *frame = (struct sigframe __user *)regs->regs[15]; | |
1da177e4 LT |
208 | sigset_t set; |
209 | int r0; | |
210 | ||
211 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
212 | goto badframe; | |
213 | ||
214 | if (__get_user(set.sig[0], &frame->sc.oldmask) | |
215 | || (_NSIG_WORDS > 1 | |
216 | && __copy_from_user(&set.sig[1], &frame->extramask, | |
217 | sizeof(frame->extramask)))) | |
218 | goto badframe; | |
219 | ||
220 | sigdelsetmask(&set, ~_BLOCKABLE); | |
221 | ||
222 | spin_lock_irq(¤t->sighand->siglock); | |
223 | current->blocked = set; | |
224 | recalc_sigpending(); | |
225 | spin_unlock_irq(¤t->sighand->siglock); | |
226 | ||
f0bc814c | 227 | if (restore_sigcontext(regs, &frame->sc, &r0)) |
1da177e4 LT |
228 | goto badframe; |
229 | return r0; | |
230 | ||
231 | badframe: | |
232 | force_sig(SIGSEGV, current); | |
233 | return 0; | |
234 | } | |
235 | ||
236 | asmlinkage int sys_rt_sigreturn(unsigned long r4, unsigned long r5, | |
237 | unsigned long r6, unsigned long r7, | |
f0bc814c | 238 | struct pt_regs __regs) |
1da177e4 | 239 | { |
f0bc814c SM |
240 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
241 | struct rt_sigframe __user *frame = (struct rt_sigframe __user *)regs->regs[15]; | |
1da177e4 LT |
242 | sigset_t set; |
243 | stack_t st; | |
244 | int r0; | |
245 | ||
246 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
247 | goto badframe; | |
248 | ||
249 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) | |
250 | goto badframe; | |
251 | ||
252 | sigdelsetmask(&set, ~_BLOCKABLE); | |
253 | spin_lock_irq(¤t->sighand->siglock); | |
254 | current->blocked = set; | |
255 | recalc_sigpending(); | |
256 | spin_unlock_irq(¤t->sighand->siglock); | |
257 | ||
f0bc814c | 258 | if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &r0)) |
1da177e4 LT |
259 | goto badframe; |
260 | ||
261 | if (__copy_from_user(&st, &frame->uc.uc_stack, sizeof(st))) | |
262 | goto badframe; | |
263 | /* It is more difficult to avoid calling this function than to | |
264 | call it and ignore errors. */ | |
f0bc814c | 265 | do_sigaltstack(&st, NULL, regs->regs[15]); |
1da177e4 LT |
266 | |
267 | return r0; | |
268 | ||
269 | badframe: | |
270 | force_sig(SIGSEGV, current); | |
271 | return 0; | |
272 | } | |
273 | ||
274 | /* | |
275 | * Set up a signal frame. | |
276 | */ | |
277 | ||
278 | static int | |
279 | setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, | |
280 | unsigned long mask) | |
281 | { | |
282 | int err = 0; | |
283 | ||
284 | #define COPY(x) err |= __put_user(regs->x, &sc->sc_##x) | |
285 | COPY(regs[0]); COPY(regs[1]); | |
286 | COPY(regs[2]); COPY(regs[3]); | |
287 | COPY(regs[4]); COPY(regs[5]); | |
288 | COPY(regs[6]); COPY(regs[7]); | |
289 | COPY(regs[8]); COPY(regs[9]); | |
290 | COPY(regs[10]); COPY(regs[11]); | |
291 | COPY(regs[12]); COPY(regs[13]); | |
292 | COPY(regs[14]); COPY(regs[15]); | |
293 | COPY(gbr); COPY(mach); | |
294 | COPY(macl); COPY(pr); | |
295 | COPY(sr); COPY(pc); | |
296 | #undef COPY | |
297 | ||
298 | #ifdef CONFIG_SH_FPU | |
299 | err |= save_sigcontext_fpu(sc, regs); | |
300 | #endif | |
301 | ||
302 | /* non-iBCS2 extensions.. */ | |
303 | err |= __put_user(mask, &sc->oldmask); | |
304 | ||
305 | return err; | |
306 | } | |
307 | ||
308 | /* | |
309 | * Determine which stack to use.. | |
310 | */ | |
311 | static inline void __user * | |
312 | get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size) | |
313 | { | |
314 | if (ka->sa.sa_flags & SA_ONSTACK) { | |
315 | if (sas_ss_flags(sp) == 0) | |
316 | sp = current->sas_ss_sp + current->sas_ss_size; | |
317 | } | |
318 | ||
319 | return (void __user *)((sp - frame_size) & -8ul); | |
320 | } | |
321 | ||
19f9a34f PM |
322 | /* These symbols are defined with the addresses in the vsyscall page. |
323 | See vsyscall-trapa.S. */ | |
324 | extern void __user __kernel_sigreturn; | |
325 | extern void __user __kernel_rt_sigreturn; | |
326 | ||
9f23e7e9 | 327 | static int setup_frame(int sig, struct k_sigaction *ka, |
1da177e4 LT |
328 | sigset_t *set, struct pt_regs *regs) |
329 | { | |
330 | struct sigframe __user *frame; | |
331 | int err = 0; | |
332 | int signal; | |
333 | ||
334 | frame = get_sigframe(ka, regs->regs[15], sizeof(*frame)); | |
335 | ||
336 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
337 | goto give_sigsegv; | |
338 | ||
339 | signal = current_thread_info()->exec_domain | |
340 | && current_thread_info()->exec_domain->signal_invmap | |
341 | && sig < 32 | |
342 | ? current_thread_info()->exec_domain->signal_invmap[sig] | |
343 | : sig; | |
344 | ||
345 | err |= setup_sigcontext(&frame->sc, regs, set->sig[0]); | |
346 | ||
9f23e7e9 | 347 | if (_NSIG_WORDS > 1) |
1da177e4 LT |
348 | err |= __copy_to_user(frame->extramask, &set->sig[1], |
349 | sizeof(frame->extramask)); | |
1da177e4 LT |
350 | |
351 | /* Set up to return from userspace. If provided, use a stub | |
352 | already in userspace. */ | |
353 | if (ka->sa.sa_flags & SA_RESTORER) { | |
354 | regs->pr = (unsigned long) ka->sa.sa_restorer; | |
19f9a34f PM |
355 | #ifdef CONFIG_VSYSCALL |
356 | } else if (likely(current->mm->context.vdso)) { | |
357 | regs->pr = VDSO_SYM(&__kernel_sigreturn); | |
358 | #endif | |
1da177e4 LT |
359 | } else { |
360 | /* Generate return code (system call to sigreturn) */ | |
361 | err |= __put_user(MOVW(7), &frame->retcode[0]); | |
9d4436a6 | 362 | err |= __put_user(TRAP_NOARG, &frame->retcode[1]); |
1da177e4 LT |
363 | err |= __put_user(OR_R0_R0, &frame->retcode[2]); |
364 | err |= __put_user(OR_R0_R0, &frame->retcode[3]); | |
365 | err |= __put_user(OR_R0_R0, &frame->retcode[4]); | |
366 | err |= __put_user(OR_R0_R0, &frame->retcode[5]); | |
367 | err |= __put_user(OR_R0_R0, &frame->retcode[6]); | |
368 | err |= __put_user((__NR_sigreturn), &frame->retcode[7]); | |
369 | regs->pr = (unsigned long) frame->retcode; | |
370 | } | |
371 | ||
372 | if (err) | |
373 | goto give_sigsegv; | |
374 | ||
375 | /* Set up registers for signal handler */ | |
376 | regs->regs[15] = (unsigned long) frame; | |
377 | regs->regs[4] = signal; /* Arg for signal handler */ | |
378 | regs->regs[5] = 0; | |
379 | regs->regs[6] = (unsigned long) &frame->sc; | |
380 | regs->pc = (unsigned long) ka->sa.sa_handler; | |
381 | ||
382 | set_fs(USER_DS); | |
383 | ||
9f23e7e9 PM |
384 | pr_debug("SIG deliver (%s:%d): sp=%p pc=%08lx pr=%08lx\n", |
385 | current->comm, current->pid, frame, regs->pc, regs->pr); | |
1da177e4 LT |
386 | |
387 | flush_cache_sigtramp(regs->pr); | |
9f23e7e9 | 388 | |
1da177e4 LT |
389 | if ((-regs->pr & (L1_CACHE_BYTES-1)) < sizeof(frame->retcode)) |
390 | flush_cache_sigtramp(regs->pr + L1_CACHE_BYTES); | |
9f23e7e9 PM |
391 | |
392 | return 0; | |
1da177e4 LT |
393 | |
394 | give_sigsegv: | |
395 | force_sigsegv(sig, current); | |
9f23e7e9 | 396 | return -EFAULT; |
1da177e4 LT |
397 | } |
398 | ||
9f23e7e9 | 399 | static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, |
1da177e4 LT |
400 | sigset_t *set, struct pt_regs *regs) |
401 | { | |
402 | struct rt_sigframe __user *frame; | |
403 | int err = 0; | |
404 | int signal; | |
405 | ||
406 | frame = get_sigframe(ka, regs->regs[15], sizeof(*frame)); | |
407 | ||
408 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
409 | goto give_sigsegv; | |
410 | ||
411 | signal = current_thread_info()->exec_domain | |
412 | && current_thread_info()->exec_domain->signal_invmap | |
413 | && sig < 32 | |
414 | ? current_thread_info()->exec_domain->signal_invmap[sig] | |
415 | : sig; | |
416 | ||
417 | err |= copy_siginfo_to_user(&frame->info, info); | |
418 | ||
419 | /* Create the ucontext. */ | |
420 | err |= __put_user(0, &frame->uc.uc_flags); | |
421 | err |= __put_user(0, &frame->uc.uc_link); | |
422 | err |= __put_user((void *)current->sas_ss_sp, | |
423 | &frame->uc.uc_stack.ss_sp); | |
424 | err |= __put_user(sas_ss_flags(regs->regs[15]), | |
425 | &frame->uc.uc_stack.ss_flags); | |
426 | err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size); | |
427 | err |= setup_sigcontext(&frame->uc.uc_mcontext, | |
428 | regs, set->sig[0]); | |
429 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); | |
430 | ||
431 | /* Set up to return from userspace. If provided, use a stub | |
432 | already in userspace. */ | |
433 | if (ka->sa.sa_flags & SA_RESTORER) { | |
434 | regs->pr = (unsigned long) ka->sa.sa_restorer; | |
19f9a34f PM |
435 | #ifdef CONFIG_VSYSCALL |
436 | } else if (likely(current->mm->context.vdso)) { | |
437 | regs->pr = VDSO_SYM(&__kernel_rt_sigreturn); | |
438 | #endif | |
1da177e4 LT |
439 | } else { |
440 | /* Generate return code (system call to rt_sigreturn) */ | |
441 | err |= __put_user(MOVW(7), &frame->retcode[0]); | |
9d4436a6 | 442 | err |= __put_user(TRAP_NOARG, &frame->retcode[1]); |
1da177e4 LT |
443 | err |= __put_user(OR_R0_R0, &frame->retcode[2]); |
444 | err |= __put_user(OR_R0_R0, &frame->retcode[3]); | |
445 | err |= __put_user(OR_R0_R0, &frame->retcode[4]); | |
446 | err |= __put_user(OR_R0_R0, &frame->retcode[5]); | |
447 | err |= __put_user(OR_R0_R0, &frame->retcode[6]); | |
448 | err |= __put_user((__NR_rt_sigreturn), &frame->retcode[7]); | |
449 | regs->pr = (unsigned long) frame->retcode; | |
450 | } | |
451 | ||
452 | if (err) | |
453 | goto give_sigsegv; | |
454 | ||
455 | /* Set up registers for signal handler */ | |
456 | regs->regs[15] = (unsigned long) frame; | |
457 | regs->regs[4] = signal; /* Arg for signal handler */ | |
458 | regs->regs[5] = (unsigned long) &frame->info; | |
459 | regs->regs[6] = (unsigned long) &frame->uc; | |
460 | regs->pc = (unsigned long) ka->sa.sa_handler; | |
461 | ||
462 | set_fs(USER_DS); | |
463 | ||
9f23e7e9 PM |
464 | pr_debug("SIG deliver (%s:%d): sp=%p pc=%08lx pr=%08lx\n", |
465 | current->comm, current->pid, frame, regs->pc, regs->pr); | |
1da177e4 LT |
466 | |
467 | flush_cache_sigtramp(regs->pr); | |
9f23e7e9 | 468 | |
1da177e4 LT |
469 | if ((-regs->pr & (L1_CACHE_BYTES-1)) < sizeof(frame->retcode)) |
470 | flush_cache_sigtramp(regs->pr + L1_CACHE_BYTES); | |
9f23e7e9 PM |
471 | |
472 | return 0; | |
1da177e4 LT |
473 | |
474 | give_sigsegv: | |
475 | force_sigsegv(sig, current); | |
9f23e7e9 | 476 | return -EFAULT; |
1da177e4 LT |
477 | } |
478 | ||
479 | /* | |
480 | * OK, we're invoking a handler | |
481 | */ | |
482 | ||
9f23e7e9 | 483 | static int |
1da177e4 LT |
484 | handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info, |
485 | sigset_t *oldset, struct pt_regs *regs) | |
486 | { | |
9f23e7e9 PM |
487 | int ret; |
488 | ||
1da177e4 LT |
489 | /* Are we from a system call? */ |
490 | if (regs->tra >= 0) { | |
491 | /* If so, check system call restarting.. */ | |
492 | switch (regs->regs[0]) { | |
493 | case -ERESTARTNOHAND: | |
494 | regs->regs[0] = -EINTR; | |
495 | break; | |
496 | ||
497 | case -ERESTARTSYS: | |
498 | if (!(ka->sa.sa_flags & SA_RESTART)) { | |
499 | regs->regs[0] = -EINTR; | |
500 | break; | |
501 | } | |
502 | /* fallthrough */ | |
503 | case -ERESTARTNOINTR: | |
504 | regs->pc -= 2; | |
505 | } | |
506 | } else { | |
507 | /* gUSA handling */ | |
508 | #ifdef CONFIG_PREEMPT | |
509 | unsigned long flags; | |
510 | ||
511 | local_irq_save(flags); | |
512 | #endif | |
513 | if (regs->regs[15] >= 0xc0000000) { | |
514 | int offset = (int)regs->regs[15]; | |
515 | ||
516 | /* Reset stack pointer: clear critical region mark */ | |
517 | regs->regs[15] = regs->regs[1]; | |
518 | if (regs->pc < regs->regs[0]) | |
519 | /* Go to rewind point #1 */ | |
520 | regs->pc = regs->regs[0] + offset - 2; | |
521 | } | |
522 | #ifdef CONFIG_PREEMPT | |
523 | local_irq_restore(flags); | |
524 | #endif | |
525 | } | |
526 | ||
527 | /* Set up the stack frame */ | |
528 | if (ka->sa.sa_flags & SA_SIGINFO) | |
9f23e7e9 | 529 | ret = setup_rt_frame(sig, ka, info, oldset, regs); |
1da177e4 | 530 | else |
9f23e7e9 | 531 | ret = setup_frame(sig, ka, oldset, regs); |
1da177e4 LT |
532 | |
533 | if (ka->sa.sa_flags & SA_ONESHOT) | |
534 | ka->sa.sa_handler = SIG_DFL; | |
535 | ||
9f23e7e9 PM |
536 | if (ret == 0) { |
537 | spin_lock_irq(¤t->sighand->siglock); | |
538 | sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); | |
539 | if (!(ka->sa.sa_flags & SA_NODEFER)) | |
540 | sigaddset(¤t->blocked,sig); | |
541 | recalc_sigpending(); | |
542 | spin_unlock_irq(¤t->sighand->siglock); | |
543 | } | |
544 | ||
545 | return ret; | |
1da177e4 LT |
546 | } |
547 | ||
548 | /* | |
549 | * Note that 'init' is a special process: it doesn't get signals it doesn't | |
550 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
551 | * mistake. | |
552 | * | |
553 | * Note that we go through the signals twice: once to check the signals that | |
554 | * the kernel can handle, and then we build all the user-level signal handling | |
555 | * stack-frames in one go after that. | |
556 | */ | |
9f23e7e9 | 557 | static void do_signal(struct pt_regs *regs, unsigned int save_r0) |
1da177e4 LT |
558 | { |
559 | siginfo_t info; | |
560 | int signr; | |
561 | struct k_sigaction ka; | |
9f23e7e9 | 562 | sigset_t *oldset; |
1da177e4 LT |
563 | |
564 | /* | |
565 | * We want the common case to go fast, which | |
566 | * is why we may in certain cases get here from | |
567 | * kernel mode. Just return without doing anything | |
568 | * if so. | |
569 | */ | |
570 | if (!user_mode(regs)) | |
9f23e7e9 | 571 | return; |
1da177e4 | 572 | |
0e6c1f5f | 573 | if (try_to_freeze()) |
1da177e4 LT |
574 | goto no_signal; |
575 | ||
9f23e7e9 PM |
576 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) |
577 | oldset = ¤t->saved_sigmask; | |
578 | else | |
1da177e4 LT |
579 | oldset = ¤t->blocked; |
580 | ||
581 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); | |
582 | if (signr > 0) { | |
583 | /* Whee! Actually deliver the signal. */ | |
9f23e7e9 PM |
584 | if (handle_signal(signr, &ka, &info, oldset, regs) == 0) { |
585 | /* a signal was successfully delivered; the saved | |
586 | * sigmask will have been stored in the signal frame, | |
587 | * and will be restored by sigreturn, so we can simply | |
588 | * clear the TIF_RESTORE_SIGMASK flag */ | |
589 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) | |
590 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
591 | } | |
1da177e4 LT |
592 | } |
593 | ||
594 | no_signal: | |
595 | /* Did we come from a system call? */ | |
596 | if (regs->tra >= 0) { | |
597 | /* Restart the system call - no handlers present */ | |
598 | if (regs->regs[0] == -ERESTARTNOHAND || | |
599 | regs->regs[0] == -ERESTARTSYS || | |
0b892935 PM |
600 | regs->regs[0] == -ERESTARTNOINTR) { |
601 | regs->regs[0] = save_r0; | |
1da177e4 | 602 | regs->pc -= 2; |
0b892935 PM |
603 | } else if (regs->regs[0] == -ERESTART_RESTARTBLOCK) { |
604 | regs->pc -= 2; | |
605 | regs->regs[3] = __NR_restart_syscall; | |
1da177e4 LT |
606 | } |
607 | } | |
9f23e7e9 PM |
608 | |
609 | /* if there's no signal to deliver, we just put the saved sigmask | |
610 | * back */ | |
611 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) { | |
612 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
613 | sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); | |
614 | } | |
615 | } | |
616 | ||
617 | asmlinkage void do_notify_resume(struct pt_regs *regs, unsigned int save_r0, | |
618 | __u32 thread_info_flags) | |
619 | { | |
620 | /* deal with pending signal delivery */ | |
621 | if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK)) | |
622 | do_signal(regs, save_r0); | |
1da177e4 | 623 | } |