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1 | /* | |
2 | * arch/sh/kernel/signal_64.c | |
3 | * | |
4 | * Copyright (C) 2000, 2001 Paolo Alberelli | |
5 | * Copyright (C) 2003 - 2008 Paul Mundt | |
6 | * Copyright (C) 2004 Richard Curnow | |
7 | * | |
8 | * This file is subject to the terms and conditions of the GNU General Public | |
9 | * License. See the file "COPYING" in the main directory of this archive | |
10 | * for more details. | |
11 | */ | |
12 | #include <linux/rwsem.h> | |
13 | #include <linux/sched.h> | |
14 | #include <linux/mm.h> | |
15 | #include <linux/smp.h> | |
16 | #include <linux/kernel.h> | |
17 | #include <linux/signal.h> | |
18 | #include <linux/errno.h> | |
19 | #include <linux/wait.h> | |
20 | #include <linux/personality.h> | |
21 | #include <linux/ptrace.h> | |
22 | #include <linux/unistd.h> | |
23 | #include <linux/stddef.h> | |
24 | #include <linux/tracehook.h> | |
25 | #include <asm/ucontext.h> | |
26 | #include <linux/uaccess.h> | |
27 | #include <asm/pgtable.h> | |
28 | #include <asm/cacheflush.h> | |
29 | #include <asm/fpu.h> | |
30 | ||
31 | #define REG_RET 9 | |
32 | #define REG_ARG1 2 | |
33 | #define REG_ARG2 3 | |
34 | #define REG_ARG3 4 | |
35 | #define REG_SP 15 | |
36 | #define REG_PR 18 | |
37 | #define REF_REG_RET regs->regs[REG_RET] | |
38 | #define REF_REG_SP regs->regs[REG_SP] | |
39 | #define DEREF_REG_PR regs->regs[REG_PR] | |
40 | ||
41 | #define DEBUG_SIG 0 | |
42 | ||
43 | static void | |
44 | handle_signal(struct ksignal *ksig, struct pt_regs *regs); | |
45 | ||
46 | static inline void | |
47 | handle_syscall_restart(struct pt_regs *regs, struct sigaction *sa) | |
48 | { | |
49 | /* If we're not from a syscall, bail out */ | |
50 | if (regs->syscall_nr < 0) | |
51 | return; | |
52 | ||
53 | /* check for system call restart.. */ | |
54 | switch (regs->regs[REG_RET]) { | |
55 | case -ERESTART_RESTARTBLOCK: | |
56 | case -ERESTARTNOHAND: | |
57 | no_system_call_restart: | |
58 | regs->regs[REG_RET] = -EINTR; | |
59 | break; | |
60 | ||
61 | case -ERESTARTSYS: | |
62 | if (!(sa->sa_flags & SA_RESTART)) | |
63 | goto no_system_call_restart; | |
64 | /* fallthrough */ | |
65 | case -ERESTARTNOINTR: | |
66 | /* Decode syscall # */ | |
67 | regs->regs[REG_RET] = regs->syscall_nr; | |
68 | regs->pc -= 4; | |
69 | break; | |
70 | } | |
71 | } | |
72 | ||
73 | /* | |
74 | * Note that 'init' is a special process: it doesn't get signals it doesn't | |
75 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
76 | * mistake. | |
77 | * | |
78 | * Note that we go through the signals twice: once to check the signals that | |
79 | * the kernel can handle, and then we build all the user-level signal handling | |
80 | * stack-frames in one go after that. | |
81 | */ | |
82 | static void do_signal(struct pt_regs *regs) | |
83 | { | |
84 | struct ksignal ksig; | |
85 | ||
86 | /* | |
87 | * We want the common case to go fast, which | |
88 | * is why we may in certain cases get here from | |
89 | * kernel mode. Just return without doing anything | |
90 | * if so. | |
91 | */ | |
92 | if (!user_mode(regs)) | |
93 | return; | |
94 | ||
95 | if (get_signal(&ksig)) { | |
96 | handle_syscall_restart(regs, &ksig.ka.sa); | |
97 | ||
98 | /* Whee! Actually deliver the signal. */ | |
99 | handle_signal(&ksig, regs); | |
100 | return; | |
101 | } | |
102 | ||
103 | /* Did we come from a system call? */ | |
104 | if (regs->syscall_nr >= 0) { | |
105 | /* Restart the system call - no handlers present */ | |
106 | switch (regs->regs[REG_RET]) { | |
107 | case -ERESTARTNOHAND: | |
108 | case -ERESTARTSYS: | |
109 | case -ERESTARTNOINTR: | |
110 | /* Decode Syscall # */ | |
111 | regs->regs[REG_RET] = regs->syscall_nr; | |
112 | regs->pc -= 4; | |
113 | break; | |
114 | ||
115 | case -ERESTART_RESTARTBLOCK: | |
116 | regs->regs[REG_RET] = __NR_restart_syscall; | |
117 | regs->pc -= 4; | |
118 | break; | |
119 | } | |
120 | } | |
121 | ||
122 | /* No signal to deliver -- put the saved sigmask back */ | |
123 | restore_saved_sigmask(); | |
124 | } | |
125 | ||
126 | /* | |
127 | * Do a signal return; undo the signal stack. | |
128 | */ | |
129 | struct sigframe { | |
130 | struct sigcontext sc; | |
131 | unsigned long extramask[_NSIG_WORDS-1]; | |
132 | long long retcode[2]; | |
133 | }; | |
134 | ||
135 | struct rt_sigframe { | |
136 | struct siginfo __user *pinfo; | |
137 | void *puc; | |
138 | struct siginfo info; | |
139 | struct ucontext uc; | |
140 | long long retcode[2]; | |
141 | }; | |
142 | ||
143 | #ifdef CONFIG_SH_FPU | |
144 | static inline int | |
145 | restore_sigcontext_fpu(struct pt_regs *regs, struct sigcontext __user *sc) | |
146 | { | |
147 | int err = 0; | |
148 | int fpvalid; | |
149 | ||
150 | err |= __get_user (fpvalid, &sc->sc_fpvalid); | |
151 | conditional_used_math(fpvalid); | |
152 | if (! fpvalid) | |
153 | return err; | |
154 | ||
155 | if (current == last_task_used_math) { | |
156 | last_task_used_math = NULL; | |
157 | regs->sr |= SR_FD; | |
158 | } | |
159 | ||
160 | err |= __copy_from_user(¤t->thread.xstate->hardfpu, &sc->sc_fpregs[0], | |
161 | (sizeof(long long) * 32) + (sizeof(int) * 1)); | |
162 | ||
163 | return err; | |
164 | } | |
165 | ||
166 | static inline int | |
167 | setup_sigcontext_fpu(struct pt_regs *regs, struct sigcontext __user *sc) | |
168 | { | |
169 | int err = 0; | |
170 | int fpvalid; | |
171 | ||
172 | fpvalid = !!used_math(); | |
173 | err |= __put_user(fpvalid, &sc->sc_fpvalid); | |
174 | if (! fpvalid) | |
175 | return err; | |
176 | ||
177 | if (current == last_task_used_math) { | |
178 | enable_fpu(); | |
179 | save_fpu(current); | |
180 | disable_fpu(); | |
181 | last_task_used_math = NULL; | |
182 | regs->sr |= SR_FD; | |
183 | } | |
184 | ||
185 | err |= __copy_to_user(&sc->sc_fpregs[0], ¤t->thread.xstate->hardfpu, | |
186 | (sizeof(long long) * 32) + (sizeof(int) * 1)); | |
187 | clear_used_math(); | |
188 | ||
189 | return err; | |
190 | } | |
191 | #else | |
192 | static inline int | |
193 | restore_sigcontext_fpu(struct pt_regs *regs, struct sigcontext __user *sc) | |
194 | { | |
195 | return 0; | |
196 | } | |
197 | static inline int | |
198 | setup_sigcontext_fpu(struct pt_regs *regs, struct sigcontext __user *sc) | |
199 | { | |
200 | return 0; | |
201 | } | |
202 | #endif | |
203 | ||
204 | static int | |
205 | restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, long long *r2_p) | |
206 | { | |
207 | unsigned int err = 0; | |
208 | unsigned long long current_sr, new_sr; | |
209 | #define SR_MASK 0xffff8cfd | |
210 | ||
211 | #define COPY(x) err |= __get_user(regs->x, &sc->sc_##x) | |
212 | ||
213 | COPY(regs[0]); COPY(regs[1]); COPY(regs[2]); COPY(regs[3]); | |
214 | COPY(regs[4]); COPY(regs[5]); COPY(regs[6]); COPY(regs[7]); | |
215 | COPY(regs[8]); COPY(regs[9]); COPY(regs[10]); COPY(regs[11]); | |
216 | COPY(regs[12]); COPY(regs[13]); COPY(regs[14]); COPY(regs[15]); | |
217 | COPY(regs[16]); COPY(regs[17]); COPY(regs[18]); COPY(regs[19]); | |
218 | COPY(regs[20]); COPY(regs[21]); COPY(regs[22]); COPY(regs[23]); | |
219 | COPY(regs[24]); COPY(regs[25]); COPY(regs[26]); COPY(regs[27]); | |
220 | COPY(regs[28]); COPY(regs[29]); COPY(regs[30]); COPY(regs[31]); | |
221 | COPY(regs[32]); COPY(regs[33]); COPY(regs[34]); COPY(regs[35]); | |
222 | COPY(regs[36]); COPY(regs[37]); COPY(regs[38]); COPY(regs[39]); | |
223 | COPY(regs[40]); COPY(regs[41]); COPY(regs[42]); COPY(regs[43]); | |
224 | COPY(regs[44]); COPY(regs[45]); COPY(regs[46]); COPY(regs[47]); | |
225 | COPY(regs[48]); COPY(regs[49]); COPY(regs[50]); COPY(regs[51]); | |
226 | COPY(regs[52]); COPY(regs[53]); COPY(regs[54]); COPY(regs[55]); | |
227 | COPY(regs[56]); COPY(regs[57]); COPY(regs[58]); COPY(regs[59]); | |
228 | COPY(regs[60]); COPY(regs[61]); COPY(regs[62]); | |
229 | COPY(tregs[0]); COPY(tregs[1]); COPY(tregs[2]); COPY(tregs[3]); | |
230 | COPY(tregs[4]); COPY(tregs[5]); COPY(tregs[6]); COPY(tregs[7]); | |
231 | ||
232 | /* Prevent the signal handler manipulating SR in a way that can | |
233 | crash the kernel. i.e. only allow S, Q, M, PR, SZ, FR to be | |
234 | modified */ | |
235 | current_sr = regs->sr; | |
236 | err |= __get_user(new_sr, &sc->sc_sr); | |
237 | regs->sr &= SR_MASK; | |
238 | regs->sr |= (new_sr & ~SR_MASK); | |
239 | ||
240 | COPY(pc); | |
241 | ||
242 | #undef COPY | |
243 | ||
244 | /* Must do this last in case it sets regs->sr.fd (i.e. after rest of sr | |
245 | * has been restored above.) */ | |
246 | err |= restore_sigcontext_fpu(regs, sc); | |
247 | ||
248 | regs->syscall_nr = -1; /* disable syscall checks */ | |
249 | err |= __get_user(*r2_p, &sc->sc_regs[REG_RET]); | |
250 | return err; | |
251 | } | |
252 | ||
253 | asmlinkage int sys_sigreturn(unsigned long r2, unsigned long r3, | |
254 | unsigned long r4, unsigned long r5, | |
255 | unsigned long r6, unsigned long r7, | |
256 | struct pt_regs * regs) | |
257 | { | |
258 | struct sigframe __user *frame = (struct sigframe __user *) (long) REF_REG_SP; | |
259 | sigset_t set; | |
260 | long long ret; | |
261 | ||
262 | /* Always make any pending restarted system calls return -EINTR */ | |
263 | current->restart_block.fn = do_no_restart_syscall; | |
264 | ||
265 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
266 | goto badframe; | |
267 | ||
268 | if (__get_user(set.sig[0], &frame->sc.oldmask) | |
269 | || (_NSIG_WORDS > 1 | |
270 | && __copy_from_user(&set.sig[1], &frame->extramask, | |
271 | sizeof(frame->extramask)))) | |
272 | goto badframe; | |
273 | ||
274 | set_current_blocked(&set); | |
275 | ||
276 | if (restore_sigcontext(regs, &frame->sc, &ret)) | |
277 | goto badframe; | |
278 | regs->pc -= 4; | |
279 | ||
280 | return (int) ret; | |
281 | ||
282 | badframe: | |
283 | force_sig(SIGSEGV, current); | |
284 | return 0; | |
285 | } | |
286 | ||
287 | asmlinkage int sys_rt_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 rt_sigframe __user *frame = (struct rt_sigframe __user *) (long) REF_REG_SP; | |
293 | sigset_t set; | |
294 | long long ret; | |
295 | ||
296 | /* Always make any pending restarted system calls return -EINTR */ | |
297 | current->restart_block.fn = do_no_restart_syscall; | |
298 | ||
299 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
300 | goto badframe; | |
301 | ||
302 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) | |
303 | goto badframe; | |
304 | ||
305 | set_current_blocked(&set); | |
306 | ||
307 | if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &ret)) | |
308 | goto badframe; | |
309 | regs->pc -= 4; | |
310 | ||
311 | if (restore_altstack(&frame->uc.uc_stack)) | |
312 | goto badframe; | |
313 | ||
314 | return (int) ret; | |
315 | ||
316 | badframe: | |
317 | force_sig(SIGSEGV, current); | |
318 | return 0; | |
319 | } | |
320 | ||
321 | /* | |
322 | * Set up a signal frame. | |
323 | */ | |
324 | static int | |
325 | setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, | |
326 | unsigned long mask) | |
327 | { | |
328 | int err = 0; | |
329 | ||
330 | /* Do this first, otherwise is this sets sr->fd, that value isn't preserved. */ | |
331 | err |= setup_sigcontext_fpu(regs, sc); | |
332 | ||
333 | #define COPY(x) err |= __put_user(regs->x, &sc->sc_##x) | |
334 | ||
335 | COPY(regs[0]); COPY(regs[1]); COPY(regs[2]); COPY(regs[3]); | |
336 | COPY(regs[4]); COPY(regs[5]); COPY(regs[6]); COPY(regs[7]); | |
337 | COPY(regs[8]); COPY(regs[9]); COPY(regs[10]); COPY(regs[11]); | |
338 | COPY(regs[12]); COPY(regs[13]); COPY(regs[14]); COPY(regs[15]); | |
339 | COPY(regs[16]); COPY(regs[17]); COPY(regs[18]); COPY(regs[19]); | |
340 | COPY(regs[20]); COPY(regs[21]); COPY(regs[22]); COPY(regs[23]); | |
341 | COPY(regs[24]); COPY(regs[25]); COPY(regs[26]); COPY(regs[27]); | |
342 | COPY(regs[28]); COPY(regs[29]); COPY(regs[30]); COPY(regs[31]); | |
343 | COPY(regs[32]); COPY(regs[33]); COPY(regs[34]); COPY(regs[35]); | |
344 | COPY(regs[36]); COPY(regs[37]); COPY(regs[38]); COPY(regs[39]); | |
345 | COPY(regs[40]); COPY(regs[41]); COPY(regs[42]); COPY(regs[43]); | |
346 | COPY(regs[44]); COPY(regs[45]); COPY(regs[46]); COPY(regs[47]); | |
347 | COPY(regs[48]); COPY(regs[49]); COPY(regs[50]); COPY(regs[51]); | |
348 | COPY(regs[52]); COPY(regs[53]); COPY(regs[54]); COPY(regs[55]); | |
349 | COPY(regs[56]); COPY(regs[57]); COPY(regs[58]); COPY(regs[59]); | |
350 | COPY(regs[60]); COPY(regs[61]); COPY(regs[62]); | |
351 | COPY(tregs[0]); COPY(tregs[1]); COPY(tregs[2]); COPY(tregs[3]); | |
352 | COPY(tregs[4]); COPY(tregs[5]); COPY(tregs[6]); COPY(tregs[7]); | |
353 | COPY(sr); COPY(pc); | |
354 | ||
355 | #undef COPY | |
356 | ||
357 | err |= __put_user(mask, &sc->oldmask); | |
358 | ||
359 | return err; | |
360 | } | |
361 | ||
362 | /* | |
363 | * Determine which stack to use.. | |
364 | */ | |
365 | static inline void __user * | |
366 | get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size) | |
367 | { | |
368 | if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && ! sas_ss_flags(sp)) | |
369 | sp = current->sas_ss_sp + current->sas_ss_size; | |
370 | ||
371 | return (void __user *)((sp - frame_size) & -8ul); | |
372 | } | |
373 | ||
374 | void sa_default_restorer(void); /* See comments below */ | |
375 | void sa_default_rt_restorer(void); /* See comments below */ | |
376 | ||
377 | static int setup_frame(struct ksignal *ksig, sigset_t *set, struct pt_regs *regs) | |
378 | { | |
379 | struct sigframe __user *frame; | |
380 | int err = 0, sig = ksig->sig; | |
381 | int signal; | |
382 | ||
383 | frame = get_sigframe(&ksig->ka, regs->regs[REG_SP], sizeof(*frame)); | |
384 | ||
385 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
386 | return -EFAULT; | |
387 | ||
388 | err |= setup_sigcontext(&frame->sc, regs, set->sig[0]); | |
389 | ||
390 | /* Give up earlier as i386, in case */ | |
391 | if (err) | |
392 | return -EFAULT; | |
393 | ||
394 | if (_NSIG_WORDS > 1) { | |
395 | err |= __copy_to_user(frame->extramask, &set->sig[1], | |
396 | sizeof(frame->extramask)); } | |
397 | ||
398 | /* Give up earlier as i386, in case */ | |
399 | if (err) | |
400 | return -EFAULT; | |
401 | ||
402 | /* Set up to return from userspace. If provided, use a stub | |
403 | already in userspace. */ | |
404 | if (ksig->ka.sa.sa_flags & SA_RESTORER) { | |
405 | /* | |
406 | * On SH5 all edited pointers are subject to NEFF | |
407 | */ | |
408 | DEREF_REG_PR = neff_sign_extend((unsigned long) | |
409 | ksig->ka->sa.sa_restorer | 0x1); | |
410 | } else { | |
411 | /* | |
412 | * Different approach on SH5. | |
413 | * . Endianness independent asm code gets placed in entry.S . | |
414 | * This is limited to four ASM instructions corresponding | |
415 | * to two long longs in size. | |
416 | * . err checking is done on the else branch only | |
417 | * . flush_icache_range() is called upon __put_user() only | |
418 | * . all edited pointers are subject to NEFF | |
419 | * . being code, linker turns ShMedia bit on, always | |
420 | * dereference index -1. | |
421 | */ | |
422 | DEREF_REG_PR = neff_sign_extend((unsigned long) | |
423 | frame->retcode | 0x01); | |
424 | ||
425 | if (__copy_to_user(frame->retcode, | |
426 | (void *)((unsigned long)sa_default_restorer & (~1)), 16) != 0) | |
427 | return -EFAULT; | |
428 | ||
429 | /* Cohere the trampoline with the I-cache. */ | |
430 | flush_cache_sigtramp(DEREF_REG_PR-1); | |
431 | } | |
432 | ||
433 | /* | |
434 | * Set up registers for signal handler. | |
435 | * All edited pointers are subject to NEFF. | |
436 | */ | |
437 | regs->regs[REG_SP] = neff_sign_extend((unsigned long)frame); | |
438 | regs->regs[REG_ARG1] = sig; /* Arg for signal handler */ | |
439 | ||
440 | /* FIXME: | |
441 | The glibc profiling support for SH-5 needs to be passed a sigcontext | |
442 | so it can retrieve the PC. At some point during 2003 the glibc | |
443 | support was changed to receive the sigcontext through the 2nd | |
444 | argument, but there are still versions of libc.so in use that use | |
445 | the 3rd argument. Until libc.so is stabilised, pass the sigcontext | |
446 | through both 2nd and 3rd arguments. | |
447 | */ | |
448 | ||
449 | regs->regs[REG_ARG2] = (unsigned long long)(unsigned long)(signed long)&frame->sc; | |
450 | regs->regs[REG_ARG3] = (unsigned long long)(unsigned long)(signed long)&frame->sc; | |
451 | ||
452 | regs->pc = neff_sign_extend((unsigned long)ksig->ka.sa.sa_handler); | |
453 | ||
454 | /* Broken %016Lx */ | |
455 | pr_debug("SIG deliver (#%d,%s:%d): sp=%p pc=%08Lx%08Lx link=%08Lx%08Lx\n", | |
456 | sig, current->comm, current->pid, frame, | |
457 | regs->pc >> 32, regs->pc & 0xffffffff, | |
458 | DEREF_REG_PR >> 32, DEREF_REG_PR & 0xffffffff); | |
459 | ||
460 | return 0; | |
461 | } | |
462 | ||
463 | static int setup_rt_frame(struct ksignal *kig, sigset_t *set, | |
464 | struct pt_regs *regs) | |
465 | { | |
466 | struct rt_sigframe __user *frame; | |
467 | int err = 0, sig = ksig->sig; | |
468 | ||
469 | frame = get_sigframe(&ksig->ka, regs->regs[REG_SP], sizeof(*frame)); | |
470 | ||
471 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
472 | return -EFAULT; | |
473 | ||
474 | err |= __put_user(&frame->info, &frame->pinfo); | |
475 | err |= __put_user(&frame->uc, &frame->puc); | |
476 | err |= copy_siginfo_to_user(&frame->info, &ksig->info); | |
477 | ||
478 | /* Give up earlier as i386, in case */ | |
479 | if (err) | |
480 | return -EFAULT; | |
481 | ||
482 | /* Create the ucontext. */ | |
483 | err |= __put_user(0, &frame->uc.uc_flags); | |
484 | err |= __put_user(0, &frame->uc.uc_link); | |
485 | err |= __save_altstack(&frame->uc.uc_stack, regs->regs[REG_SP]); | |
486 | err |= setup_sigcontext(&frame->uc.uc_mcontext, | |
487 | regs, set->sig[0]); | |
488 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); | |
489 | ||
490 | /* Give up earlier as i386, in case */ | |
491 | if (err) | |
492 | return -EFAULT; | |
493 | ||
494 | /* Set up to return from userspace. If provided, use a stub | |
495 | already in userspace. */ | |
496 | if (ksig->ka.sa.sa_flags & SA_RESTORER) { | |
497 | /* | |
498 | * On SH5 all edited pointers are subject to NEFF | |
499 | */ | |
500 | DEREF_REG_PR = neff_sign_extend((unsigned long) | |
501 | ksig->ka.sa.sa_restorer | 0x1); | |
502 | } else { | |
503 | /* | |
504 | * Different approach on SH5. | |
505 | * . Endianness independent asm code gets placed in entry.S . | |
506 | * This is limited to four ASM instructions corresponding | |
507 | * to two long longs in size. | |
508 | * . err checking is done on the else branch only | |
509 | * . flush_icache_range() is called upon __put_user() only | |
510 | * . all edited pointers are subject to NEFF | |
511 | * . being code, linker turns ShMedia bit on, always | |
512 | * dereference index -1. | |
513 | */ | |
514 | DEREF_REG_PR = neff_sign_extend((unsigned long) | |
515 | frame->retcode | 0x01); | |
516 | ||
517 | if (__copy_to_user(frame->retcode, | |
518 | (void *)((unsigned long)sa_default_rt_restorer & (~1)), 16) != 0) | |
519 | return -EFAULT; | |
520 | ||
521 | /* Cohere the trampoline with the I-cache. */ | |
522 | flush_icache_range(DEREF_REG_PR-1, DEREF_REG_PR-1+15); | |
523 | } | |
524 | ||
525 | /* | |
526 | * Set up registers for signal handler. | |
527 | * All edited pointers are subject to NEFF. | |
528 | */ | |
529 | regs->regs[REG_SP] = neff_sign_extend((unsigned long)frame); | |
530 | regs->regs[REG_ARG1] = sig; /* Arg for signal handler */ | |
531 | regs->regs[REG_ARG2] = (unsigned long long)(unsigned long)(signed long)&frame->info; | |
532 | regs->regs[REG_ARG3] = (unsigned long long)(unsigned long)(signed long)&frame->uc.uc_mcontext; | |
533 | regs->pc = neff_sign_extend((unsigned long)ksig->ka.sa.sa_handler); | |
534 | ||
535 | pr_debug("SIG deliver (#%d,%s:%d): sp=%p pc=%08Lx%08Lx link=%08Lx%08Lx\n", | |
536 | sig, current->comm, current->pid, frame, | |
537 | regs->pc >> 32, regs->pc & 0xffffffff, | |
538 | DEREF_REG_PR >> 32, DEREF_REG_PR & 0xffffffff); | |
539 | ||
540 | return 0; | |
541 | } | |
542 | ||
543 | /* | |
544 | * OK, we're invoking a handler | |
545 | */ | |
546 | static void | |
547 | handle_signal(struct ksignal *ksig, struct pt_regs *regs) | |
548 | { | |
549 | sigset_t *oldset = sigmask_to_save(); | |
550 | int ret; | |
551 | ||
552 | /* Set up the stack frame */ | |
553 | if (ksig->ka.sa.sa_flags & SA_SIGINFO) | |
554 | ret = setup_rt_frame(ksig, oldset, regs); | |
555 | else | |
556 | ret = setup_frame(ksig, oldset, regs); | |
557 | ||
558 | signal_setup_done(ret, ksig, test_thread_flag(TIF_SINGLESTEP)); | |
559 | } | |
560 | ||
561 | asmlinkage void do_notify_resume(struct pt_regs *regs, unsigned long thread_info_flags) | |
562 | { | |
563 | if (thread_info_flags & _TIF_SIGPENDING) | |
564 | do_signal(regs); | |
565 | ||
566 | if (thread_info_flags & _TIF_NOTIFY_RESUME) { | |
567 | clear_thread_flag(TIF_NOTIFY_RESUME); | |
568 | tracehook_notify_resume(regs); | |
569 | } | |
570 | } |