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> | |
1da177e4 LT |
14 | #include <linux/kernel.h> |
15 | #include <linux/signal.h> | |
16 | #include <linux/errno.h> | |
17 | #include <linux/wait.h> | |
18 | #include <linux/ptrace.h> | |
19 | #include <linux/unistd.h> | |
20 | #include <linux/stddef.h> | |
21 | #include <linux/tty.h> | |
19f9a34f | 22 | #include <linux/elf.h> |
1da177e4 LT |
23 | #include <linux/personality.h> |
24 | #include <linux/binfmts.h> | |
7dfb7103 | 25 | #include <linux/freezer.h> |
1da177e4 LT |
26 | |
27 | #include <asm/ucontext.h> | |
28 | #include <asm/uaccess.h> | |
29 | #include <asm/pgtable.h> | |
30 | #include <asm/cacheflush.h> | |
31 | ||
1da177e4 LT |
32 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) |
33 | ||
1da177e4 LT |
34 | /* |
35 | * Atomically swap in the new signal mask, and wait for a signal. | |
36 | */ | |
37 | asmlinkage int | |
38 | sys_sigsuspend(old_sigset_t mask, | |
39 | unsigned long r5, unsigned long r6, unsigned long r7, | |
f0bc814c | 40 | struct pt_regs __regs) |
1da177e4 | 41 | { |
1da177e4 LT |
42 | mask &= _BLOCKABLE; |
43 | spin_lock_irq(¤t->sighand->siglock); | |
9f23e7e9 | 44 | current->saved_sigmask = current->blocked; |
1da177e4 LT |
45 | siginitset(¤t->blocked, mask); |
46 | recalc_sigpending(); | |
47 | spin_unlock_irq(¤t->sighand->siglock); | |
48 | ||
9f23e7e9 PM |
49 | current->state = TASK_INTERRUPTIBLE; |
50 | schedule(); | |
51 | set_thread_flag(TIF_RESTORE_SIGMASK); | |
52 | return -ERESTARTNOHAND; | |
1da177e4 LT |
53 | } |
54 | ||
f0bc814c | 55 | asmlinkage int |
1da177e4 LT |
56 | sys_sigaction(int sig, const struct old_sigaction __user *act, |
57 | struct old_sigaction __user *oact) | |
58 | { | |
59 | struct k_sigaction new_ka, old_ka; | |
60 | int ret; | |
61 | ||
62 | if (act) { | |
63 | old_sigset_t mask; | |
64 | if (!access_ok(VERIFY_READ, act, sizeof(*act)) || | |
65 | __get_user(new_ka.sa.sa_handler, &act->sa_handler) || | |
66 | __get_user(new_ka.sa.sa_restorer, &act->sa_restorer)) | |
67 | return -EFAULT; | |
68 | __get_user(new_ka.sa.sa_flags, &act->sa_flags); | |
69 | __get_user(mask, &act->sa_mask); | |
70 | siginitset(&new_ka.sa.sa_mask, mask); | |
71 | } | |
72 | ||
73 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
74 | ||
75 | if (!ret && oact) { | |
76 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || | |
77 | __put_user(old_ka.sa.sa_handler, &oact->sa_handler) || | |
78 | __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer)) | |
79 | return -EFAULT; | |
80 | __put_user(old_ka.sa.sa_flags, &oact->sa_flags); | |
81 | __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask); | |
82 | } | |
83 | ||
84 | return ret; | |
85 | } | |
86 | ||
87 | asmlinkage int | |
88 | sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss, | |
89 | unsigned long r6, unsigned long r7, | |
f0bc814c | 90 | struct pt_regs __regs) |
1da177e4 | 91 | { |
f0bc814c SM |
92 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
93 | ||
94 | return do_sigaltstack(uss, uoss, regs->regs[15]); | |
1da177e4 LT |
95 | } |
96 | ||
97 | ||
98 | /* | |
99 | * Do a signal return; undo the signal stack. | |
100 | */ | |
101 | ||
102 | #define MOVW(n) (0x9300|((n)-2)) /* Move mem word at PC+n to R3 */ | |
11cbb70e | 103 | #if defined(CONFIG_CPU_SH2) |
9d4436a6 YS |
104 | #define TRAP_NOARG 0xc320 /* Syscall w/no args (NR in R3) */ |
105 | #else | |
106 | #define TRAP_NOARG 0xc310 /* Syscall w/no args (NR in R3) */ | |
107 | #endif | |
1da177e4 LT |
108 | #define OR_R0_R0 0x200b /* or r0,r0 (insert to avoid hardware bug) */ |
109 | ||
110 | struct sigframe | |
111 | { | |
112 | struct sigcontext sc; | |
113 | unsigned long extramask[_NSIG_WORDS-1]; | |
114 | u16 retcode[8]; | |
115 | }; | |
116 | ||
117 | struct rt_sigframe | |
118 | { | |
119 | struct siginfo info; | |
120 | struct ucontext uc; | |
121 | u16 retcode[8]; | |
122 | }; | |
123 | ||
124 | #ifdef CONFIG_SH_FPU | |
125 | static inline int restore_sigcontext_fpu(struct sigcontext __user *sc) | |
126 | { | |
127 | struct task_struct *tsk = current; | |
128 | ||
11c19656 | 129 | if (!(current_cpu_data.flags & CPU_HAS_FPU)) |
1da177e4 LT |
130 | return 0; |
131 | ||
132 | set_used_math(); | |
133 | return __copy_from_user(&tsk->thread.fpu.hard, &sc->sc_fpregs[0], | |
134 | sizeof(long)*(16*2+2)); | |
135 | } | |
136 | ||
137 | static inline int save_sigcontext_fpu(struct sigcontext __user *sc, | |
138 | struct pt_regs *regs) | |
139 | { | |
140 | struct task_struct *tsk = current; | |
141 | ||
11c19656 | 142 | if (!(current_cpu_data.flags & CPU_HAS_FPU)) |
1da177e4 LT |
143 | return 0; |
144 | ||
145 | if (!used_math()) { | |
146 | __put_user(0, &sc->sc_ownedfp); | |
147 | return 0; | |
148 | } | |
149 | ||
150 | __put_user(1, &sc->sc_ownedfp); | |
151 | ||
152 | /* This will cause a "finit" to be triggered by the next | |
153 | attempted FPU operation by the 'current' process. | |
154 | */ | |
155 | clear_used_math(); | |
156 | ||
157 | unlazy_fpu(tsk, regs); | |
158 | return __copy_to_user(&sc->sc_fpregs[0], &tsk->thread.fpu.hard, | |
159 | sizeof(long)*(16*2+2)); | |
160 | } | |
161 | #endif /* CONFIG_SH_FPU */ | |
162 | ||
163 | static int | |
164 | restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, int *r0_p) | |
165 | { | |
166 | unsigned int err = 0; | |
167 | ||
168 | #define COPY(x) err |= __get_user(regs->x, &sc->sc_##x) | |
169 | COPY(regs[1]); | |
170 | COPY(regs[2]); COPY(regs[3]); | |
171 | COPY(regs[4]); COPY(regs[5]); | |
172 | COPY(regs[6]); COPY(regs[7]); | |
173 | COPY(regs[8]); COPY(regs[9]); | |
174 | COPY(regs[10]); COPY(regs[11]); | |
175 | COPY(regs[12]); COPY(regs[13]); | |
176 | COPY(regs[14]); COPY(regs[15]); | |
177 | COPY(gbr); COPY(mach); | |
178 | COPY(macl); COPY(pr); | |
179 | COPY(sr); COPY(pc); | |
180 | #undef COPY | |
181 | ||
182 | #ifdef CONFIG_SH_FPU | |
11c19656 | 183 | if (current_cpu_data.flags & CPU_HAS_FPU) { |
1da177e4 LT |
184 | int owned_fp; |
185 | struct task_struct *tsk = current; | |
186 | ||
187 | regs->sr |= SR_FD; /* Release FPU */ | |
188 | clear_fpu(tsk, regs); | |
189 | clear_used_math(); | |
190 | __get_user (owned_fp, &sc->sc_ownedfp); | |
191 | if (owned_fp) | |
192 | err |= restore_sigcontext_fpu(sc); | |
193 | } | |
194 | #endif | |
195 | ||
196 | regs->tra = -1; /* disable syscall checks */ | |
197 | err |= __get_user(*r0_p, &sc->sc_regs[0]); | |
198 | return err; | |
199 | } | |
200 | ||
201 | asmlinkage int sys_sigreturn(unsigned long r4, unsigned long r5, | |
202 | unsigned long r6, unsigned long r7, | |
f0bc814c | 203 | struct pt_regs __regs) |
1da177e4 | 204 | { |
f0bc814c SM |
205 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
206 | struct sigframe __user *frame = (struct sigframe __user *)regs->regs[15]; | |
1da177e4 LT |
207 | sigset_t set; |
208 | int r0; | |
209 | ||
210 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
211 | goto badframe; | |
212 | ||
213 | if (__get_user(set.sig[0], &frame->sc.oldmask) | |
214 | || (_NSIG_WORDS > 1 | |
215 | && __copy_from_user(&set.sig[1], &frame->extramask, | |
216 | sizeof(frame->extramask)))) | |
217 | goto badframe; | |
218 | ||
219 | sigdelsetmask(&set, ~_BLOCKABLE); | |
220 | ||
221 | spin_lock_irq(¤t->sighand->siglock); | |
222 | current->blocked = set; | |
223 | recalc_sigpending(); | |
224 | spin_unlock_irq(¤t->sighand->siglock); | |
225 | ||
f0bc814c | 226 | if (restore_sigcontext(regs, &frame->sc, &r0)) |
1da177e4 LT |
227 | goto badframe; |
228 | return r0; | |
229 | ||
230 | badframe: | |
231 | force_sig(SIGSEGV, current); | |
232 | return 0; | |
233 | } | |
234 | ||
235 | asmlinkage int sys_rt_sigreturn(unsigned long r4, unsigned long r5, | |
236 | unsigned long r6, unsigned long r7, | |
f0bc814c | 237 | struct pt_regs __regs) |
1da177e4 | 238 | { |
f0bc814c SM |
239 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
240 | struct rt_sigframe __user *frame = (struct rt_sigframe __user *)regs->regs[15]; | |
1da177e4 LT |
241 | sigset_t set; |
242 | stack_t st; | |
243 | int r0; | |
244 | ||
245 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
246 | goto badframe; | |
247 | ||
248 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) | |
249 | goto badframe; | |
250 | ||
251 | sigdelsetmask(&set, ~_BLOCKABLE); | |
252 | spin_lock_irq(¤t->sighand->siglock); | |
253 | current->blocked = set; | |
254 | recalc_sigpending(); | |
255 | spin_unlock_irq(¤t->sighand->siglock); | |
256 | ||
f0bc814c | 257 | if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &r0)) |
1da177e4 LT |
258 | goto badframe; |
259 | ||
260 | if (__copy_from_user(&st, &frame->uc.uc_stack, sizeof(st))) | |
261 | goto badframe; | |
262 | /* It is more difficult to avoid calling this function than to | |
263 | call it and ignore errors. */ | |
f0bc814c | 264 | do_sigaltstack(&st, NULL, regs->regs[15]); |
1da177e4 LT |
265 | |
266 | return r0; | |
267 | ||
268 | badframe: | |
269 | force_sig(SIGSEGV, current); | |
270 | return 0; | |
271 | } | |
272 | ||
273 | /* | |
274 | * Set up a signal frame. | |
275 | */ | |
276 | ||
277 | static int | |
278 | setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, | |
279 | unsigned long mask) | |
280 | { | |
281 | int err = 0; | |
282 | ||
283 | #define COPY(x) err |= __put_user(regs->x, &sc->sc_##x) | |
284 | COPY(regs[0]); COPY(regs[1]); | |
285 | COPY(regs[2]); COPY(regs[3]); | |
286 | COPY(regs[4]); COPY(regs[5]); | |
287 | COPY(regs[6]); COPY(regs[7]); | |
288 | COPY(regs[8]); COPY(regs[9]); | |
289 | COPY(regs[10]); COPY(regs[11]); | |
290 | COPY(regs[12]); COPY(regs[13]); | |
291 | COPY(regs[14]); COPY(regs[15]); | |
292 | COPY(gbr); COPY(mach); | |
293 | COPY(macl); COPY(pr); | |
294 | COPY(sr); COPY(pc); | |
295 | #undef COPY | |
296 | ||
297 | #ifdef CONFIG_SH_FPU | |
298 | err |= save_sigcontext_fpu(sc, regs); | |
299 | #endif | |
300 | ||
301 | /* non-iBCS2 extensions.. */ | |
302 | err |= __put_user(mask, &sc->oldmask); | |
303 | ||
304 | return err; | |
305 | } | |
306 | ||
307 | /* | |
308 | * Determine which stack to use.. | |
309 | */ | |
310 | static inline void __user * | |
311 | get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size) | |
312 | { | |
313 | if (ka->sa.sa_flags & SA_ONSTACK) { | |
314 | if (sas_ss_flags(sp) == 0) | |
315 | sp = current->sas_ss_sp + current->sas_ss_size; | |
316 | } | |
317 | ||
318 | return (void __user *)((sp - frame_size) & -8ul); | |
319 | } | |
320 | ||
19f9a34f PM |
321 | /* These symbols are defined with the addresses in the vsyscall page. |
322 | See vsyscall-trapa.S. */ | |
323 | extern void __user __kernel_sigreturn; | |
324 | extern void __user __kernel_rt_sigreturn; | |
325 | ||
9f23e7e9 | 326 | static int setup_frame(int sig, struct k_sigaction *ka, |
1da177e4 LT |
327 | sigset_t *set, struct pt_regs *regs) |
328 | { | |
329 | struct sigframe __user *frame; | |
330 | int err = 0; | |
331 | int signal; | |
332 | ||
333 | frame = get_sigframe(ka, regs->regs[15], sizeof(*frame)); | |
334 | ||
335 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
336 | goto give_sigsegv; | |
337 | ||
338 | signal = current_thread_info()->exec_domain | |
339 | && current_thread_info()->exec_domain->signal_invmap | |
340 | && sig < 32 | |
341 | ? current_thread_info()->exec_domain->signal_invmap[sig] | |
342 | : sig; | |
343 | ||
344 | err |= setup_sigcontext(&frame->sc, regs, set->sig[0]); | |
345 | ||
9f23e7e9 | 346 | if (_NSIG_WORDS > 1) |
1da177e4 LT |
347 | err |= __copy_to_user(frame->extramask, &set->sig[1], |
348 | sizeof(frame->extramask)); | |
1da177e4 LT |
349 | |
350 | /* Set up to return from userspace. If provided, use a stub | |
351 | already in userspace. */ | |
352 | if (ka->sa.sa_flags & SA_RESTORER) { | |
353 | regs->pr = (unsigned long) ka->sa.sa_restorer; | |
19f9a34f PM |
354 | #ifdef CONFIG_VSYSCALL |
355 | } else if (likely(current->mm->context.vdso)) { | |
356 | regs->pr = VDSO_SYM(&__kernel_sigreturn); | |
357 | #endif | |
1da177e4 LT |
358 | } else { |
359 | /* Generate return code (system call to sigreturn) */ | |
360 | err |= __put_user(MOVW(7), &frame->retcode[0]); | |
9d4436a6 | 361 | err |= __put_user(TRAP_NOARG, &frame->retcode[1]); |
1da177e4 LT |
362 | err |= __put_user(OR_R0_R0, &frame->retcode[2]); |
363 | err |= __put_user(OR_R0_R0, &frame->retcode[3]); | |
364 | err |= __put_user(OR_R0_R0, &frame->retcode[4]); | |
365 | err |= __put_user(OR_R0_R0, &frame->retcode[5]); | |
366 | err |= __put_user(OR_R0_R0, &frame->retcode[6]); | |
367 | err |= __put_user((__NR_sigreturn), &frame->retcode[7]); | |
368 | regs->pr = (unsigned long) frame->retcode; | |
369 | } | |
370 | ||
371 | if (err) | |
372 | goto give_sigsegv; | |
373 | ||
374 | /* Set up registers for signal handler */ | |
375 | regs->regs[15] = (unsigned long) frame; | |
376 | regs->regs[4] = signal; /* Arg for signal handler */ | |
377 | regs->regs[5] = 0; | |
378 | regs->regs[6] = (unsigned long) &frame->sc; | |
379 | regs->pc = (unsigned long) ka->sa.sa_handler; | |
380 | ||
381 | set_fs(USER_DS); | |
382 | ||
9f23e7e9 PM |
383 | pr_debug("SIG deliver (%s:%d): sp=%p pc=%08lx pr=%08lx\n", |
384 | current->comm, current->pid, frame, regs->pc, regs->pr); | |
1da177e4 LT |
385 | |
386 | flush_cache_sigtramp(regs->pr); | |
9f23e7e9 | 387 | |
1da177e4 LT |
388 | if ((-regs->pr & (L1_CACHE_BYTES-1)) < sizeof(frame->retcode)) |
389 | flush_cache_sigtramp(regs->pr + L1_CACHE_BYTES); | |
9f23e7e9 PM |
390 | |
391 | return 0; | |
1da177e4 LT |
392 | |
393 | give_sigsegv: | |
394 | force_sigsegv(sig, current); | |
9f23e7e9 | 395 | return -EFAULT; |
1da177e4 LT |
396 | } |
397 | ||
9f23e7e9 | 398 | static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, |
1da177e4 LT |
399 | sigset_t *set, struct pt_regs *regs) |
400 | { | |
401 | struct rt_sigframe __user *frame; | |
402 | int err = 0; | |
403 | int signal; | |
404 | ||
405 | frame = get_sigframe(ka, regs->regs[15], sizeof(*frame)); | |
406 | ||
407 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
408 | goto give_sigsegv; | |
409 | ||
410 | signal = current_thread_info()->exec_domain | |
411 | && current_thread_info()->exec_domain->signal_invmap | |
412 | && sig < 32 | |
413 | ? current_thread_info()->exec_domain->signal_invmap[sig] | |
414 | : sig; | |
415 | ||
416 | err |= copy_siginfo_to_user(&frame->info, info); | |
417 | ||
418 | /* Create the ucontext. */ | |
419 | err |= __put_user(0, &frame->uc.uc_flags); | |
420 | err |= __put_user(0, &frame->uc.uc_link); | |
421 | err |= __put_user((void *)current->sas_ss_sp, | |
422 | &frame->uc.uc_stack.ss_sp); | |
423 | err |= __put_user(sas_ss_flags(regs->regs[15]), | |
424 | &frame->uc.uc_stack.ss_flags); | |
425 | err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size); | |
426 | err |= setup_sigcontext(&frame->uc.uc_mcontext, | |
427 | regs, set->sig[0]); | |
428 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); | |
429 | ||
430 | /* Set up to return from userspace. If provided, use a stub | |
431 | already in userspace. */ | |
432 | if (ka->sa.sa_flags & SA_RESTORER) { | |
433 | regs->pr = (unsigned long) ka->sa.sa_restorer; | |
19f9a34f PM |
434 | #ifdef CONFIG_VSYSCALL |
435 | } else if (likely(current->mm->context.vdso)) { | |
436 | regs->pr = VDSO_SYM(&__kernel_rt_sigreturn); | |
437 | #endif | |
1da177e4 LT |
438 | } else { |
439 | /* Generate return code (system call to rt_sigreturn) */ | |
440 | err |= __put_user(MOVW(7), &frame->retcode[0]); | |
9d4436a6 | 441 | err |= __put_user(TRAP_NOARG, &frame->retcode[1]); |
1da177e4 LT |
442 | err |= __put_user(OR_R0_R0, &frame->retcode[2]); |
443 | err |= __put_user(OR_R0_R0, &frame->retcode[3]); | |
444 | err |= __put_user(OR_R0_R0, &frame->retcode[4]); | |
445 | err |= __put_user(OR_R0_R0, &frame->retcode[5]); | |
446 | err |= __put_user(OR_R0_R0, &frame->retcode[6]); | |
447 | err |= __put_user((__NR_rt_sigreturn), &frame->retcode[7]); | |
448 | regs->pr = (unsigned long) frame->retcode; | |
449 | } | |
450 | ||
451 | if (err) | |
452 | goto give_sigsegv; | |
453 | ||
454 | /* Set up registers for signal handler */ | |
455 | regs->regs[15] = (unsigned long) frame; | |
456 | regs->regs[4] = signal; /* Arg for signal handler */ | |
457 | regs->regs[5] = (unsigned long) &frame->info; | |
458 | regs->regs[6] = (unsigned long) &frame->uc; | |
459 | regs->pc = (unsigned long) ka->sa.sa_handler; | |
460 | ||
461 | set_fs(USER_DS); | |
462 | ||
9f23e7e9 PM |
463 | pr_debug("SIG deliver (%s:%d): sp=%p pc=%08lx pr=%08lx\n", |
464 | current->comm, current->pid, frame, regs->pc, regs->pr); | |
1da177e4 LT |
465 | |
466 | flush_cache_sigtramp(regs->pr); | |
9f23e7e9 | 467 | |
1da177e4 LT |
468 | if ((-regs->pr & (L1_CACHE_BYTES-1)) < sizeof(frame->retcode)) |
469 | flush_cache_sigtramp(regs->pr + L1_CACHE_BYTES); | |
9f23e7e9 PM |
470 | |
471 | return 0; | |
1da177e4 LT |
472 | |
473 | give_sigsegv: | |
474 | force_sigsegv(sig, current); | |
9f23e7e9 | 475 | return -EFAULT; |
1da177e4 LT |
476 | } |
477 | ||
478 | /* | |
479 | * OK, we're invoking a handler | |
480 | */ | |
481 | ||
9f23e7e9 | 482 | static int |
1da177e4 LT |
483 | handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info, |
484 | sigset_t *oldset, struct pt_regs *regs) | |
485 | { | |
9f23e7e9 PM |
486 | int ret; |
487 | ||
1da177e4 LT |
488 | /* Are we from a system call? */ |
489 | if (regs->tra >= 0) { | |
490 | /* If so, check system call restarting.. */ | |
491 | switch (regs->regs[0]) { | |
492 | case -ERESTARTNOHAND: | |
493 | regs->regs[0] = -EINTR; | |
494 | break; | |
495 | ||
496 | case -ERESTARTSYS: | |
497 | if (!(ka->sa.sa_flags & SA_RESTART)) { | |
498 | regs->regs[0] = -EINTR; | |
499 | break; | |
500 | } | |
501 | /* fallthrough */ | |
502 | case -ERESTARTNOINTR: | |
503 | regs->pc -= 2; | |
504 | } | |
505 | } else { | |
506 | /* gUSA handling */ | |
507 | #ifdef CONFIG_PREEMPT | |
508 | unsigned long flags; | |
509 | ||
510 | local_irq_save(flags); | |
511 | #endif | |
512 | if (regs->regs[15] >= 0xc0000000) { | |
513 | int offset = (int)regs->regs[15]; | |
514 | ||
515 | /* Reset stack pointer: clear critical region mark */ | |
516 | regs->regs[15] = regs->regs[1]; | |
517 | if (regs->pc < regs->regs[0]) | |
518 | /* Go to rewind point #1 */ | |
519 | regs->pc = regs->regs[0] + offset - 2; | |
520 | } | |
521 | #ifdef CONFIG_PREEMPT | |
522 | local_irq_restore(flags); | |
523 | #endif | |
524 | } | |
525 | ||
526 | /* Set up the stack frame */ | |
527 | if (ka->sa.sa_flags & SA_SIGINFO) | |
9f23e7e9 | 528 | ret = setup_rt_frame(sig, ka, info, oldset, regs); |
1da177e4 | 529 | else |
9f23e7e9 | 530 | ret = setup_frame(sig, ka, oldset, regs); |
1da177e4 LT |
531 | |
532 | if (ka->sa.sa_flags & SA_ONESHOT) | |
533 | ka->sa.sa_handler = SIG_DFL; | |
534 | ||
9f23e7e9 PM |
535 | if (ret == 0) { |
536 | spin_lock_irq(¤t->sighand->siglock); | |
537 | sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); | |
538 | if (!(ka->sa.sa_flags & SA_NODEFER)) | |
539 | sigaddset(¤t->blocked,sig); | |
540 | recalc_sigpending(); | |
541 | spin_unlock_irq(¤t->sighand->siglock); | |
542 | } | |
543 | ||
544 | return ret; | |
1da177e4 LT |
545 | } |
546 | ||
547 | /* | |
548 | * Note that 'init' is a special process: it doesn't get signals it doesn't | |
549 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
550 | * mistake. | |
551 | * | |
552 | * Note that we go through the signals twice: once to check the signals that | |
553 | * the kernel can handle, and then we build all the user-level signal handling | |
554 | * stack-frames in one go after that. | |
555 | */ | |
9f23e7e9 | 556 | static void do_signal(struct pt_regs *regs, unsigned int save_r0) |
1da177e4 LT |
557 | { |
558 | siginfo_t info; | |
559 | int signr; | |
560 | struct k_sigaction ka; | |
9f23e7e9 | 561 | sigset_t *oldset; |
1da177e4 LT |
562 | |
563 | /* | |
564 | * We want the common case to go fast, which | |
565 | * is why we may in certain cases get here from | |
566 | * kernel mode. Just return without doing anything | |
567 | * if so. | |
568 | */ | |
569 | if (!user_mode(regs)) | |
9f23e7e9 | 570 | return; |
1da177e4 | 571 | |
0e6c1f5f | 572 | if (try_to_freeze()) |
1da177e4 LT |
573 | goto no_signal; |
574 | ||
9f23e7e9 PM |
575 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) |
576 | oldset = ¤t->saved_sigmask; | |
577 | else | |
1da177e4 LT |
578 | oldset = ¤t->blocked; |
579 | ||
580 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); | |
581 | if (signr > 0) { | |
582 | /* Whee! Actually deliver the signal. */ | |
9f23e7e9 PM |
583 | if (handle_signal(signr, &ka, &info, oldset, regs) == 0) { |
584 | /* a signal was successfully delivered; the saved | |
585 | * sigmask will have been stored in the signal frame, | |
586 | * and will be restored by sigreturn, so we can simply | |
587 | * clear the TIF_RESTORE_SIGMASK flag */ | |
588 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) | |
589 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
590 | } | |
c8bfa1fd RS |
591 | |
592 | return; | |
1da177e4 LT |
593 | } |
594 | ||
595 | no_signal: | |
596 | /* Did we come from a system call? */ | |
597 | if (regs->tra >= 0) { | |
598 | /* Restart the system call - no handlers present */ | |
599 | if (regs->regs[0] == -ERESTARTNOHAND || | |
600 | regs->regs[0] == -ERESTARTSYS || | |
0b892935 | 601 | regs->regs[0] == -ERESTARTNOINTR) { |
c8bfa1fd | 602 | regs->regs[0] = save_r0; |
1da177e4 | 603 | regs->pc -= 2; |
0b892935 PM |
604 | } else if (regs->regs[0] == -ERESTART_RESTARTBLOCK) { |
605 | regs->pc -= 2; | |
606 | regs->regs[3] = __NR_restart_syscall; | |
1da177e4 LT |
607 | } |
608 | } | |
9f23e7e9 PM |
609 | |
610 | /* if there's no signal to deliver, we just put the saved sigmask | |
611 | * back */ | |
612 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) { | |
613 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
614 | sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); | |
615 | } | |
616 | } | |
617 | ||
618 | asmlinkage void do_notify_resume(struct pt_regs *regs, unsigned int save_r0, | |
619 | __u32 thread_info_flags) | |
620 | { | |
621 | /* deal with pending signal delivery */ | |
622 | if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK)) | |
623 | do_signal(regs, save_r0); | |
1da177e4 | 624 | } |