Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/arch/alpha/kernel/signal.c | |
3 | * | |
4 | * Copyright (C) 1995 Linus Torvalds | |
5 | * | |
6 | * 1997-11-02 Modified for POSIX.1b signals by Richard Henderson | |
7 | */ | |
8 | ||
9 | #include <linux/sched.h> | |
10 | #include <linux/kernel.h> | |
11 | #include <linux/signal.h> | |
12 | #include <linux/errno.h> | |
13 | #include <linux/wait.h> | |
14 | #include <linux/ptrace.h> | |
15 | #include <linux/unistd.h> | |
16 | #include <linux/mm.h> | |
17 | #include <linux/smp.h> | |
1da177e4 LT |
18 | #include <linux/stddef.h> |
19 | #include <linux/tty.h> | |
20 | #include <linux/binfmts.h> | |
21 | #include <linux/bitops.h> | |
e5d9a90c | 22 | #include <linux/syscalls.h> |
733e5e4b | 23 | #include <linux/tracehook.h> |
1da177e4 LT |
24 | |
25 | #include <asm/uaccess.h> | |
26 | #include <asm/sigcontext.h> | |
27 | #include <asm/ucontext.h> | |
28 | ||
29 | #include "proto.h" | |
30 | ||
31 | ||
32 | #define DEBUG_SIG 0 | |
33 | ||
34 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) | |
35 | ||
36 | asmlinkage void ret_from_sys_call(void); | |
b927b3e2 RH |
37 | static void do_signal(struct pt_regs *, struct switch_stack *, |
38 | unsigned long, unsigned long); | |
1da177e4 LT |
39 | |
40 | ||
41 | /* | |
42 | * The OSF/1 sigprocmask calling sequence is different from the | |
43 | * C sigprocmask() sequence.. | |
44 | * | |
45 | * how: | |
46 | * 1 - SIG_BLOCK | |
47 | * 2 - SIG_UNBLOCK | |
48 | * 3 - SIG_SETMASK | |
49 | * | |
50 | * We change the range to -1 .. 1 in order to let gcc easily | |
51 | * use the conditional move instructions. | |
52 | * | |
53 | * Note that we don't need to acquire the kernel lock for SMP | |
54 | * operation, as all of this is local to this thread. | |
55 | */ | |
e5d9a90c IK |
56 | SYSCALL_DEFINE3(osf_sigprocmask, int, how, unsigned long, newmask, |
57 | struct pt_regs *, regs) | |
1da177e4 LT |
58 | { |
59 | unsigned long oldmask = -EINVAL; | |
60 | ||
61 | if ((unsigned long)how-1 <= 2) { | |
62 | long sign = how-2; /* -1 .. 1 */ | |
63 | unsigned long block, unblock; | |
64 | ||
65 | newmask &= _BLOCKABLE; | |
66 | spin_lock_irq(¤t->sighand->siglock); | |
67 | oldmask = current->blocked.sig[0]; | |
68 | ||
69 | unblock = oldmask & ~newmask; | |
70 | block = oldmask | newmask; | |
71 | if (!sign) | |
72 | block = unblock; | |
73 | if (sign <= 0) | |
74 | newmask = block; | |
75 | if (_NSIG_WORDS > 1 && sign > 0) | |
76 | sigemptyset(¤t->blocked); | |
77 | current->blocked.sig[0] = newmask; | |
78 | recalc_sigpending(); | |
79 | spin_unlock_irq(¤t->sighand->siglock); | |
80 | ||
81 | regs->r0 = 0; /* special no error return */ | |
82 | } | |
83 | return oldmask; | |
84 | } | |
85 | ||
e5d9a90c IK |
86 | SYSCALL_DEFINE3(osf_sigaction, int, sig, |
87 | const struct osf_sigaction __user *, act, | |
88 | struct osf_sigaction __user *, oact) | |
1da177e4 LT |
89 | { |
90 | struct k_sigaction new_ka, old_ka; | |
91 | int ret; | |
92 | ||
93 | if (act) { | |
94 | old_sigset_t mask; | |
95 | if (!access_ok(VERIFY_READ, act, sizeof(*act)) || | |
96 | __get_user(new_ka.sa.sa_handler, &act->sa_handler) || | |
97 | __get_user(new_ka.sa.sa_flags, &act->sa_flags)) | |
98 | return -EFAULT; | |
99 | __get_user(mask, &act->sa_mask); | |
100 | siginitset(&new_ka.sa.sa_mask, mask); | |
101 | new_ka.ka_restorer = NULL; | |
102 | } | |
103 | ||
104 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
105 | ||
106 | if (!ret && oact) { | |
107 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || | |
108 | __put_user(old_ka.sa.sa_handler, &oact->sa_handler) || | |
109 | __put_user(old_ka.sa.sa_flags, &oact->sa_flags)) | |
110 | return -EFAULT; | |
111 | __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask); | |
112 | } | |
113 | ||
114 | return ret; | |
115 | } | |
116 | ||
e5d9a90c IK |
117 | SYSCALL_DEFINE5(rt_sigaction, int, sig, const struct sigaction __user *, act, |
118 | struct sigaction __user *, oact, | |
119 | size_t, sigsetsize, void __user *, restorer) | |
1da177e4 LT |
120 | { |
121 | struct k_sigaction new_ka, old_ka; | |
122 | int ret; | |
123 | ||
124 | /* XXX: Don't preclude handling different sized sigset_t's. */ | |
125 | if (sigsetsize != sizeof(sigset_t)) | |
126 | return -EINVAL; | |
127 | ||
128 | if (act) { | |
129 | new_ka.ka_restorer = restorer; | |
130 | if (copy_from_user(&new_ka.sa, act, sizeof(*act))) | |
131 | return -EFAULT; | |
132 | } | |
133 | ||
134 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
135 | ||
136 | if (!ret && oact) { | |
137 | if (copy_to_user(oact, &old_ka.sa, sizeof(*oact))) | |
138 | return -EFAULT; | |
139 | } | |
140 | ||
141 | return ret; | |
142 | } | |
143 | ||
144 | /* | |
145 | * Atomically swap in the new signal mask, and wait for a signal. | |
146 | */ | |
147 | asmlinkage int | |
148 | do_sigsuspend(old_sigset_t mask, struct pt_regs *regs, struct switch_stack *sw) | |
149 | { | |
1da177e4 LT |
150 | mask &= _BLOCKABLE; |
151 | spin_lock_irq(¤t->sighand->siglock); | |
b927b3e2 | 152 | current->saved_sigmask = current->blocked; |
1da177e4 LT |
153 | siginitset(¤t->blocked, mask); |
154 | recalc_sigpending(); | |
155 | spin_unlock_irq(¤t->sighand->siglock); | |
156 | ||
157 | /* Indicate EINTR on return from any possible signal handler, | |
158 | which will not come back through here, but via sigreturn. */ | |
159 | regs->r0 = EINTR; | |
160 | regs->r19 = 1; | |
161 | ||
b927b3e2 RH |
162 | current->state = TASK_INTERRUPTIBLE; |
163 | schedule(); | |
164 | set_thread_flag(TIF_RESTORE_SIGMASK); | |
165 | return -ERESTARTNOHAND; | |
1da177e4 LT |
166 | } |
167 | ||
168 | asmlinkage int | |
169 | do_rt_sigsuspend(sigset_t __user *uset, size_t sigsetsize, | |
170 | struct pt_regs *regs, struct switch_stack *sw) | |
171 | { | |
b927b3e2 | 172 | sigset_t set; |
1da177e4 LT |
173 | |
174 | /* XXX: Don't preclude handling different sized sigset_t's. */ | |
175 | if (sigsetsize != sizeof(sigset_t)) | |
176 | return -EINVAL; | |
177 | if (copy_from_user(&set, uset, sizeof(set))) | |
178 | return -EFAULT; | |
179 | ||
180 | sigdelsetmask(&set, ~_BLOCKABLE); | |
181 | spin_lock_irq(¤t->sighand->siglock); | |
b927b3e2 | 182 | current->saved_sigmask = current->blocked; |
1da177e4 LT |
183 | current->blocked = set; |
184 | recalc_sigpending(); | |
185 | spin_unlock_irq(¤t->sighand->siglock); | |
186 | ||
187 | /* Indicate EINTR on return from any possible signal handler, | |
188 | which will not come back through here, but via sigreturn. */ | |
189 | regs->r0 = EINTR; | |
190 | regs->r19 = 1; | |
191 | ||
b927b3e2 RH |
192 | current->state = TASK_INTERRUPTIBLE; |
193 | schedule(); | |
194 | set_thread_flag(TIF_RESTORE_SIGMASK); | |
195 | return -ERESTARTNOHAND; | |
1da177e4 LT |
196 | } |
197 | ||
198 | asmlinkage int | |
199 | sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss) | |
200 | { | |
201 | return do_sigaltstack(uss, uoss, rdusp()); | |
202 | } | |
203 | ||
204 | /* | |
205 | * Do a signal return; undo the signal stack. | |
206 | */ | |
207 | ||
208 | #if _NSIG_WORDS > 1 | |
209 | # error "Non SA_SIGINFO frame needs rearranging" | |
210 | #endif | |
211 | ||
212 | struct sigframe | |
213 | { | |
214 | struct sigcontext sc; | |
215 | unsigned int retcode[3]; | |
216 | }; | |
217 | ||
218 | struct rt_sigframe | |
219 | { | |
220 | struct siginfo info; | |
221 | struct ucontext uc; | |
222 | unsigned int retcode[3]; | |
223 | }; | |
224 | ||
225 | /* If this changes, userland unwinders that Know Things about our signal | |
226 | frame will break. Do not undertake lightly. It also implies an ABI | |
227 | change wrt the size of siginfo_t, which may cause some pain. */ | |
228 | extern char compile_time_assert | |
229 | [offsetof(struct rt_sigframe, uc.uc_mcontext) == 176 ? 1 : -1]; | |
230 | ||
231 | #define INSN_MOV_R30_R16 0x47fe0410 | |
232 | #define INSN_LDI_R0 0x201f0000 | |
233 | #define INSN_CALLSYS 0x00000083 | |
234 | ||
235 | static long | |
236 | restore_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, | |
237 | struct switch_stack *sw) | |
238 | { | |
239 | unsigned long usp; | |
240 | long i, err = __get_user(regs->pc, &sc->sc_pc); | |
241 | ||
242 | sw->r26 = (unsigned long) ret_from_sys_call; | |
243 | ||
244 | err |= __get_user(regs->r0, sc->sc_regs+0); | |
245 | err |= __get_user(regs->r1, sc->sc_regs+1); | |
246 | err |= __get_user(regs->r2, sc->sc_regs+2); | |
247 | err |= __get_user(regs->r3, sc->sc_regs+3); | |
248 | err |= __get_user(regs->r4, sc->sc_regs+4); | |
249 | err |= __get_user(regs->r5, sc->sc_regs+5); | |
250 | err |= __get_user(regs->r6, sc->sc_regs+6); | |
251 | err |= __get_user(regs->r7, sc->sc_regs+7); | |
252 | err |= __get_user(regs->r8, sc->sc_regs+8); | |
253 | err |= __get_user(sw->r9, sc->sc_regs+9); | |
254 | err |= __get_user(sw->r10, sc->sc_regs+10); | |
255 | err |= __get_user(sw->r11, sc->sc_regs+11); | |
256 | err |= __get_user(sw->r12, sc->sc_regs+12); | |
257 | err |= __get_user(sw->r13, sc->sc_regs+13); | |
258 | err |= __get_user(sw->r14, sc->sc_regs+14); | |
259 | err |= __get_user(sw->r15, sc->sc_regs+15); | |
260 | err |= __get_user(regs->r16, sc->sc_regs+16); | |
261 | err |= __get_user(regs->r17, sc->sc_regs+17); | |
262 | err |= __get_user(regs->r18, sc->sc_regs+18); | |
263 | err |= __get_user(regs->r19, sc->sc_regs+19); | |
264 | err |= __get_user(regs->r20, sc->sc_regs+20); | |
265 | err |= __get_user(regs->r21, sc->sc_regs+21); | |
266 | err |= __get_user(regs->r22, sc->sc_regs+22); | |
267 | err |= __get_user(regs->r23, sc->sc_regs+23); | |
268 | err |= __get_user(regs->r24, sc->sc_regs+24); | |
269 | err |= __get_user(regs->r25, sc->sc_regs+25); | |
270 | err |= __get_user(regs->r26, sc->sc_regs+26); | |
271 | err |= __get_user(regs->r27, sc->sc_regs+27); | |
272 | err |= __get_user(regs->r28, sc->sc_regs+28); | |
273 | err |= __get_user(regs->gp, sc->sc_regs+29); | |
274 | err |= __get_user(usp, sc->sc_regs+30); | |
275 | wrusp(usp); | |
276 | ||
277 | for (i = 0; i < 31; i++) | |
278 | err |= __get_user(sw->fp[i], sc->sc_fpregs+i); | |
279 | err |= __get_user(sw->fp[31], &sc->sc_fpcr); | |
280 | ||
281 | return err; | |
282 | } | |
283 | ||
284 | /* Note that this syscall is also used by setcontext(3) to install | |
285 | a given sigcontext. This because it's impossible to set *all* | |
286 | registers and transfer control from userland. */ | |
287 | ||
288 | asmlinkage void | |
289 | do_sigreturn(struct sigcontext __user *sc, struct pt_regs *regs, | |
290 | struct switch_stack *sw) | |
291 | { | |
292 | sigset_t set; | |
293 | ||
294 | /* Verify that it's a good sigcontext before using it */ | |
295 | if (!access_ok(VERIFY_READ, sc, sizeof(*sc))) | |
296 | goto give_sigsegv; | |
297 | if (__get_user(set.sig[0], &sc->sc_mask)) | |
298 | goto give_sigsegv; | |
299 | ||
300 | sigdelsetmask(&set, ~_BLOCKABLE); | |
301 | spin_lock_irq(¤t->sighand->siglock); | |
302 | current->blocked = set; | |
303 | recalc_sigpending(); | |
304 | spin_unlock_irq(¤t->sighand->siglock); | |
305 | ||
306 | if (restore_sigcontext(sc, regs, sw)) | |
307 | goto give_sigsegv; | |
308 | ||
309 | /* Send SIGTRAP if we're single-stepping: */ | |
310 | if (ptrace_cancel_bpt (current)) { | |
311 | siginfo_t info; | |
312 | ||
313 | info.si_signo = SIGTRAP; | |
314 | info.si_errno = 0; | |
315 | info.si_code = TRAP_BRKPT; | |
316 | info.si_addr = (void __user *) regs->pc; | |
317 | info.si_trapno = 0; | |
318 | send_sig_info(SIGTRAP, &info, current); | |
319 | } | |
320 | return; | |
321 | ||
322 | give_sigsegv: | |
323 | force_sig(SIGSEGV, current); | |
324 | } | |
325 | ||
326 | asmlinkage void | |
327 | do_rt_sigreturn(struct rt_sigframe __user *frame, struct pt_regs *regs, | |
328 | struct switch_stack *sw) | |
329 | { | |
330 | sigset_t set; | |
331 | ||
332 | /* Verify that it's a good ucontext_t before using it */ | |
333 | if (!access_ok(VERIFY_READ, &frame->uc, sizeof(frame->uc))) | |
334 | goto give_sigsegv; | |
335 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) | |
336 | goto give_sigsegv; | |
337 | ||
338 | sigdelsetmask(&set, ~_BLOCKABLE); | |
339 | spin_lock_irq(¤t->sighand->siglock); | |
340 | current->blocked = set; | |
341 | recalc_sigpending(); | |
342 | spin_unlock_irq(¤t->sighand->siglock); | |
343 | ||
344 | if (restore_sigcontext(&frame->uc.uc_mcontext, regs, sw)) | |
345 | goto give_sigsegv; | |
346 | ||
347 | /* Send SIGTRAP if we're single-stepping: */ | |
348 | if (ptrace_cancel_bpt (current)) { | |
349 | siginfo_t info; | |
350 | ||
351 | info.si_signo = SIGTRAP; | |
352 | info.si_errno = 0; | |
353 | info.si_code = TRAP_BRKPT; | |
354 | info.si_addr = (void __user *) regs->pc; | |
355 | info.si_trapno = 0; | |
356 | send_sig_info(SIGTRAP, &info, current); | |
357 | } | |
358 | return; | |
359 | ||
360 | give_sigsegv: | |
361 | force_sig(SIGSEGV, current); | |
362 | } | |
363 | ||
364 | ||
365 | /* | |
366 | * Set up a signal frame. | |
367 | */ | |
368 | ||
369 | static inline void __user * | |
370 | get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size) | |
371 | { | |
d09042da | 372 | if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && ! sas_ss_flags(sp)) |
1da177e4 LT |
373 | sp = current->sas_ss_sp + current->sas_ss_size; |
374 | ||
375 | return (void __user *)((sp - frame_size) & -32ul); | |
376 | } | |
377 | ||
378 | static long | |
379 | setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, | |
380 | struct switch_stack *sw, unsigned long mask, unsigned long sp) | |
381 | { | |
382 | long i, err = 0; | |
383 | ||
384 | err |= __put_user(on_sig_stack((unsigned long)sc), &sc->sc_onstack); | |
385 | err |= __put_user(mask, &sc->sc_mask); | |
386 | err |= __put_user(regs->pc, &sc->sc_pc); | |
387 | err |= __put_user(8, &sc->sc_ps); | |
388 | ||
389 | err |= __put_user(regs->r0 , sc->sc_regs+0); | |
390 | err |= __put_user(regs->r1 , sc->sc_regs+1); | |
391 | err |= __put_user(regs->r2 , sc->sc_regs+2); | |
392 | err |= __put_user(regs->r3 , sc->sc_regs+3); | |
393 | err |= __put_user(regs->r4 , sc->sc_regs+4); | |
394 | err |= __put_user(regs->r5 , sc->sc_regs+5); | |
395 | err |= __put_user(regs->r6 , sc->sc_regs+6); | |
396 | err |= __put_user(regs->r7 , sc->sc_regs+7); | |
397 | err |= __put_user(regs->r8 , sc->sc_regs+8); | |
398 | err |= __put_user(sw->r9 , sc->sc_regs+9); | |
399 | err |= __put_user(sw->r10 , sc->sc_regs+10); | |
400 | err |= __put_user(sw->r11 , sc->sc_regs+11); | |
401 | err |= __put_user(sw->r12 , sc->sc_regs+12); | |
402 | err |= __put_user(sw->r13 , sc->sc_regs+13); | |
403 | err |= __put_user(sw->r14 , sc->sc_regs+14); | |
404 | err |= __put_user(sw->r15 , sc->sc_regs+15); | |
405 | err |= __put_user(regs->r16, sc->sc_regs+16); | |
406 | err |= __put_user(regs->r17, sc->sc_regs+17); | |
407 | err |= __put_user(regs->r18, sc->sc_regs+18); | |
408 | err |= __put_user(regs->r19, sc->sc_regs+19); | |
409 | err |= __put_user(regs->r20, sc->sc_regs+20); | |
410 | err |= __put_user(regs->r21, sc->sc_regs+21); | |
411 | err |= __put_user(regs->r22, sc->sc_regs+22); | |
412 | err |= __put_user(regs->r23, sc->sc_regs+23); | |
413 | err |= __put_user(regs->r24, sc->sc_regs+24); | |
414 | err |= __put_user(regs->r25, sc->sc_regs+25); | |
415 | err |= __put_user(regs->r26, sc->sc_regs+26); | |
416 | err |= __put_user(regs->r27, sc->sc_regs+27); | |
417 | err |= __put_user(regs->r28, sc->sc_regs+28); | |
418 | err |= __put_user(regs->gp , sc->sc_regs+29); | |
419 | err |= __put_user(sp, sc->sc_regs+30); | |
420 | err |= __put_user(0, sc->sc_regs+31); | |
421 | ||
422 | for (i = 0; i < 31; i++) | |
423 | err |= __put_user(sw->fp[i], sc->sc_fpregs+i); | |
424 | err |= __put_user(0, sc->sc_fpregs+31); | |
425 | err |= __put_user(sw->fp[31], &sc->sc_fpcr); | |
426 | ||
427 | err |= __put_user(regs->trap_a0, &sc->sc_traparg_a0); | |
428 | err |= __put_user(regs->trap_a1, &sc->sc_traparg_a1); | |
429 | err |= __put_user(regs->trap_a2, &sc->sc_traparg_a2); | |
430 | ||
431 | return err; | |
432 | } | |
433 | ||
b927b3e2 | 434 | static int |
1da177e4 LT |
435 | setup_frame(int sig, struct k_sigaction *ka, sigset_t *set, |
436 | struct pt_regs *regs, struct switch_stack * sw) | |
437 | { | |
438 | unsigned long oldsp, r26, err = 0; | |
439 | struct sigframe __user *frame; | |
440 | ||
441 | oldsp = rdusp(); | |
442 | frame = get_sigframe(ka, oldsp, sizeof(*frame)); | |
443 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
444 | goto give_sigsegv; | |
445 | ||
446 | err |= setup_sigcontext(&frame->sc, regs, sw, set->sig[0], oldsp); | |
447 | if (err) | |
448 | goto give_sigsegv; | |
449 | ||
450 | /* Set up to return from userspace. If provided, use a stub | |
451 | already in userspace. */ | |
452 | if (ka->ka_restorer) { | |
453 | r26 = (unsigned long) ka->ka_restorer; | |
454 | } else { | |
455 | err |= __put_user(INSN_MOV_R30_R16, frame->retcode+0); | |
456 | err |= __put_user(INSN_LDI_R0+__NR_sigreturn, frame->retcode+1); | |
457 | err |= __put_user(INSN_CALLSYS, frame->retcode+2); | |
458 | imb(); | |
459 | r26 = (unsigned long) frame->retcode; | |
460 | } | |
461 | ||
462 | /* Check that everything was written properly. */ | |
463 | if (err) | |
464 | goto give_sigsegv; | |
465 | ||
466 | /* "Return" to the handler */ | |
467 | regs->r26 = r26; | |
468 | regs->r27 = regs->pc = (unsigned long) ka->sa.sa_handler; | |
469 | regs->r16 = sig; /* a0: signal number */ | |
470 | regs->r17 = 0; /* a1: exception code */ | |
471 | regs->r18 = (unsigned long) &frame->sc; /* a2: sigcontext pointer */ | |
472 | wrusp((unsigned long) frame); | |
473 | ||
474 | #if DEBUG_SIG | |
475 | printk("SIG deliver (%s:%d): sp=%p pc=%p ra=%p\n", | |
476 | current->comm, current->pid, frame, regs->pc, regs->r26); | |
477 | #endif | |
478 | ||
b927b3e2 | 479 | return 0; |
1da177e4 LT |
480 | |
481 | give_sigsegv: | |
482 | force_sigsegv(sig, current); | |
b927b3e2 | 483 | return -EFAULT; |
1da177e4 LT |
484 | } |
485 | ||
b927b3e2 | 486 | static int |
1da177e4 LT |
487 | setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, |
488 | sigset_t *set, struct pt_regs *regs, struct switch_stack * sw) | |
489 | { | |
490 | unsigned long oldsp, r26, err = 0; | |
491 | struct rt_sigframe __user *frame; | |
492 | ||
493 | oldsp = rdusp(); | |
494 | frame = get_sigframe(ka, oldsp, sizeof(*frame)); | |
495 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
496 | goto give_sigsegv; | |
497 | ||
498 | err |= copy_siginfo_to_user(&frame->info, info); | |
499 | ||
500 | /* Create the ucontext. */ | |
501 | err |= __put_user(0, &frame->uc.uc_flags); | |
502 | err |= __put_user(0, &frame->uc.uc_link); | |
503 | err |= __put_user(set->sig[0], &frame->uc.uc_osf_sigmask); | |
504 | err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp); | |
505 | err |= __put_user(sas_ss_flags(oldsp), &frame->uc.uc_stack.ss_flags); | |
506 | err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size); | |
507 | err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, sw, | |
508 | set->sig[0], oldsp); | |
509 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); | |
510 | if (err) | |
511 | goto give_sigsegv; | |
512 | ||
513 | /* Set up to return from userspace. If provided, use a stub | |
514 | already in userspace. */ | |
515 | if (ka->ka_restorer) { | |
516 | r26 = (unsigned long) ka->ka_restorer; | |
517 | } else { | |
518 | err |= __put_user(INSN_MOV_R30_R16, frame->retcode+0); | |
519 | err |= __put_user(INSN_LDI_R0+__NR_rt_sigreturn, | |
520 | frame->retcode+1); | |
521 | err |= __put_user(INSN_CALLSYS, frame->retcode+2); | |
522 | imb(); | |
523 | r26 = (unsigned long) frame->retcode; | |
524 | } | |
525 | ||
526 | if (err) | |
527 | goto give_sigsegv; | |
528 | ||
529 | /* "Return" to the handler */ | |
530 | regs->r26 = r26; | |
531 | regs->r27 = regs->pc = (unsigned long) ka->sa.sa_handler; | |
532 | regs->r16 = sig; /* a0: signal number */ | |
533 | regs->r17 = (unsigned long) &frame->info; /* a1: siginfo pointer */ | |
534 | regs->r18 = (unsigned long) &frame->uc; /* a2: ucontext pointer */ | |
535 | wrusp((unsigned long) frame); | |
536 | ||
537 | #if DEBUG_SIG | |
538 | printk("SIG deliver (%s:%d): sp=%p pc=%p ra=%p\n", | |
539 | current->comm, current->pid, frame, regs->pc, regs->r26); | |
540 | #endif | |
541 | ||
b927b3e2 | 542 | return 0; |
1da177e4 LT |
543 | |
544 | give_sigsegv: | |
545 | force_sigsegv(sig, current); | |
b927b3e2 | 546 | return -EFAULT; |
1da177e4 LT |
547 | } |
548 | ||
549 | ||
550 | /* | |
551 | * OK, we're invoking a handler. | |
552 | */ | |
b927b3e2 | 553 | static inline int |
1da177e4 LT |
554 | handle_signal(int sig, struct k_sigaction *ka, siginfo_t *info, |
555 | sigset_t *oldset, struct pt_regs * regs, struct switch_stack *sw) | |
556 | { | |
b927b3e2 RH |
557 | int ret; |
558 | ||
1da177e4 | 559 | if (ka->sa.sa_flags & SA_SIGINFO) |
b927b3e2 | 560 | ret = setup_rt_frame(sig, ka, info, oldset, regs, sw); |
1da177e4 | 561 | else |
b927b3e2 | 562 | ret = setup_frame(sig, ka, oldset, regs, sw); |
1da177e4 | 563 | |
b927b3e2 RH |
564 | if (ret == 0) { |
565 | spin_lock_irq(¤t->sighand->siglock); | |
566 | sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); | |
567 | if (!(ka->sa.sa_flags & SA_NODEFER)) | |
568 | sigaddset(¤t->blocked,sig); | |
569 | recalc_sigpending(); | |
570 | spin_unlock_irq(¤t->sighand->siglock); | |
571 | } | |
1da177e4 | 572 | |
b927b3e2 | 573 | return ret; |
1da177e4 LT |
574 | } |
575 | ||
576 | static inline void | |
577 | syscall_restart(unsigned long r0, unsigned long r19, | |
578 | struct pt_regs *regs, struct k_sigaction *ka) | |
579 | { | |
580 | switch (regs->r0) { | |
581 | case ERESTARTSYS: | |
582 | if (!(ka->sa.sa_flags & SA_RESTART)) { | |
583 | case ERESTARTNOHAND: | |
584 | regs->r0 = EINTR; | |
585 | break; | |
586 | } | |
587 | /* fallthrough */ | |
588 | case ERESTARTNOINTR: | |
589 | regs->r0 = r0; /* reset v0 and a3 and replay syscall */ | |
590 | regs->r19 = r19; | |
591 | regs->pc -= 4; | |
592 | break; | |
593 | case ERESTART_RESTARTBLOCK: | |
594 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
595 | regs->r0 = EINTR; | |
596 | break; | |
597 | } | |
598 | } | |
599 | ||
600 | ||
601 | /* | |
602 | * Note that 'init' is a special process: it doesn't get signals it doesn't | |
603 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
604 | * mistake. | |
605 | * | |
606 | * Note that we go through the signals twice: once to check the signals that | |
607 | * the kernel can handle, and then we build all the user-level signal handling | |
608 | * stack-frames in one go after that. | |
609 | * | |
610 | * "r0" and "r19" are the registers we need to restore for system call | |
611 | * restart. "r0" is also used as an indicator whether we can restart at | |
612 | * all (if we get here from anything but a syscall return, it will be 0) | |
613 | */ | |
b927b3e2 RH |
614 | static void |
615 | do_signal(struct pt_regs * regs, struct switch_stack * sw, | |
1da177e4 LT |
616 | unsigned long r0, unsigned long r19) |
617 | { | |
618 | siginfo_t info; | |
619 | int signr; | |
620 | unsigned long single_stepping = ptrace_cancel_bpt(current); | |
621 | struct k_sigaction ka; | |
b927b3e2 | 622 | sigset_t *oldset; |
1da177e4 | 623 | |
b927b3e2 RH |
624 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) |
625 | oldset = ¤t->saved_sigmask; | |
626 | else | |
1da177e4 LT |
627 | oldset = ¤t->blocked; |
628 | ||
629 | /* This lets the debugger run, ... */ | |
630 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); | |
b927b3e2 | 631 | |
1da177e4 LT |
632 | /* ... so re-check the single stepping. */ |
633 | single_stepping |= ptrace_cancel_bpt(current); | |
634 | ||
635 | if (signr > 0) { | |
636 | /* Whee! Actually deliver the signal. */ | |
b927b3e2 RH |
637 | if (r0) |
638 | syscall_restart(r0, r19, regs, &ka); | |
639 | if (handle_signal(signr, &ka, &info, oldset, regs, sw) == 0) { | |
640 | /* A signal was successfully delivered, and the | |
641 | saved sigmask was stored on the signal frame, | |
642 | and will be restored by sigreturn. So we can | |
643 | simply clear the restore sigmask flag. */ | |
644 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) | |
645 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
646 | } | |
1da177e4 LT |
647 | if (single_stepping) |
648 | ptrace_set_bpt(current); /* re-set bpt */ | |
b927b3e2 | 649 | return; |
1da177e4 LT |
650 | } |
651 | ||
652 | if (r0) { | |
653 | switch (regs->r0) { | |
654 | case ERESTARTNOHAND: | |
655 | case ERESTARTSYS: | |
656 | case ERESTARTNOINTR: | |
657 | /* Reset v0 and a3 and replay syscall. */ | |
658 | regs->r0 = r0; | |
659 | regs->r19 = r19; | |
660 | regs->pc -= 4; | |
661 | break; | |
662 | case ERESTART_RESTARTBLOCK: | |
663 | /* Force v0 to the restart syscall and reply. */ | |
664 | regs->r0 = __NR_restart_syscall; | |
665 | regs->pc -= 4; | |
666 | break; | |
667 | } | |
668 | } | |
b927b3e2 RH |
669 | |
670 | /* If there's no signal to deliver, we just restore the saved mask. */ | |
671 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) { | |
672 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
673 | sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); | |
674 | } | |
675 | ||
1da177e4 LT |
676 | if (single_stepping) |
677 | ptrace_set_bpt(current); /* re-set breakpoint */ | |
1da177e4 LT |
678 | } |
679 | ||
680 | void | |
b927b3e2 RH |
681 | do_notify_resume(struct pt_regs *regs, struct switch_stack *sw, |
682 | unsigned long thread_info_flags, | |
683 | unsigned long r0, unsigned long r19) | |
1da177e4 | 684 | { |
b927b3e2 RH |
685 | if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK)) |
686 | do_signal(regs, sw, r0, r19); | |
d0420c83 DH |
687 | |
688 | if (thread_info_flags & _TIF_NOTIFY_RESUME) { | |
689 | clear_thread_flag(TIF_NOTIFY_RESUME); | |
690 | tracehook_notify_resume(regs); | |
ee18d64c DH |
691 | if (current->replacement_session_keyring) |
692 | key_replace_session_keyring(); | |
d0420c83 | 693 | } |
1da177e4 | 694 | } |