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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * arch/sh/kernel/signal_64.c
4 *
5 * Copyright (C) 2000, 2001 Paolo Alberelli
6 * Copyright (C) 2003 - 2008 Paul Mundt
7 * Copyright (C) 2004 Richard Curnow
8 */
9#include <linux/rwsem.h>
10#include <linux/sched.h>
11#include <linux/mm.h>
12#include <linux/smp.h>
13#include <linux/kernel.h>
14#include <linux/signal.h>
15#include <linux/errno.h>
16#include <linux/wait.h>
17#include <linux/personality.h>
18#include <linux/ptrace.h>
19#include <linux/unistd.h>
20#include <linux/stddef.h>
21#include <linux/tracehook.h>
22#include <asm/ucontext.h>
23#include <linux/uaccess.h>
24#include <asm/pgtable.h>
25#include <asm/cacheflush.h>
26#include <asm/fpu.h>
27
28#define REG_RET 9
29#define REG_ARG1 2
30#define REG_ARG2 3
31#define REG_ARG3 4
32#define REG_SP 15
33#define REG_PR 18
34#define REF_REG_RET regs->regs[REG_RET]
35#define REF_REG_SP regs->regs[REG_SP]
36#define DEREF_REG_PR regs->regs[REG_PR]
37
38#define DEBUG_SIG 0
39
40static void
41handle_signal(struct ksignal *ksig, struct pt_regs *regs);
42
43static inline void
44handle_syscall_restart(struct pt_regs *regs, struct sigaction *sa)
45{
46 /* If we're not from a syscall, bail out */
47 if (regs->syscall_nr < 0)
48 return;
49
50 /* check for system call restart.. */
51 switch (regs->regs[REG_RET]) {
52 case -ERESTART_RESTARTBLOCK:
53 case -ERESTARTNOHAND:
54 no_system_call_restart:
55 regs->regs[REG_RET] = -EINTR;
56 break;
57
58 case -ERESTARTSYS:
59 if (!(sa->sa_flags & SA_RESTART))
60 goto no_system_call_restart;
61 /* fallthrough */
62 case -ERESTARTNOINTR:
63 /* Decode syscall # */
64 regs->regs[REG_RET] = regs->syscall_nr;
65 regs->pc -= 4;
66 break;
67 }
68}
69
70/*
71 * Note that 'init' is a special process: it doesn't get signals it doesn't
72 * want to handle. Thus you cannot kill init even with a SIGKILL even by
73 * mistake.
74 *
75 * Note that we go through the signals twice: once to check the signals that
76 * the kernel can handle, and then we build all the user-level signal handling
77 * stack-frames in one go after that.
78 */
79static void do_signal(struct pt_regs *regs)
80{
81 struct ksignal ksig;
82
83 /*
84 * We want the common case to go fast, which
85 * is why we may in certain cases get here from
86 * kernel mode. Just return without doing anything
87 * if so.
88 */
89 if (!user_mode(regs))
90 return;
91
92 if (get_signal(&ksig)) {
93 handle_syscall_restart(regs, &ksig.ka.sa);
94
95 /* Whee! Actually deliver the signal. */
96 handle_signal(&ksig, regs);
97 return;
98 }
99
100 /* Did we come from a system call? */
101 if (regs->syscall_nr >= 0) {
102 /* Restart the system call - no handlers present */
103 switch (regs->regs[REG_RET]) {
104 case -ERESTARTNOHAND:
105 case -ERESTARTSYS:
106 case -ERESTARTNOINTR:
107 /* Decode Syscall # */
108 regs->regs[REG_RET] = regs->syscall_nr;
109 regs->pc -= 4;
110 break;
111
112 case -ERESTART_RESTARTBLOCK:
113 regs->regs[REG_RET] = __NR_restart_syscall;
114 regs->pc -= 4;
115 break;
116 }
117 }
118
119 /* No signal to deliver -- put the saved sigmask back */
120 restore_saved_sigmask();
121}
122
123/*
124 * Do a signal return; undo the signal stack.
125 */
126struct sigframe {
127 struct sigcontext sc;
128 unsigned long extramask[_NSIG_WORDS-1];
129 long long retcode[2];
130};
131
132struct rt_sigframe {
133 struct siginfo __user *pinfo;
134 void *puc;
135 struct siginfo info;
136 struct ucontext uc;
137 long long retcode[2];
138};
139
140#ifdef CONFIG_SH_FPU
141static inline int
142restore_sigcontext_fpu(struct pt_regs *regs, struct sigcontext __user *sc)
143{
144 int err = 0;
145 int fpvalid;
146
147 err |= __get_user (fpvalid, &sc->sc_fpvalid);
148 conditional_used_math(fpvalid);
149 if (! fpvalid)
150 return err;
151
152 if (current == last_task_used_math) {
153 last_task_used_math = NULL;
154 regs->sr |= SR_FD;
155 }
156
157 err |= __copy_from_user(¤t->thread.xstate->hardfpu, &sc->sc_fpregs[0],
158 (sizeof(long long) * 32) + (sizeof(int) * 1));
159
160 return err;
161}
162
163static inline int
164setup_sigcontext_fpu(struct pt_regs *regs, struct sigcontext __user *sc)
165{
166 int err = 0;
167 int fpvalid;
168
169 fpvalid = !!used_math();
170 err |= __put_user(fpvalid, &sc->sc_fpvalid);
171 if (! fpvalid)
172 return err;
173
174 if (current == last_task_used_math) {
175 enable_fpu();
176 save_fpu(current);
177 disable_fpu();
178 last_task_used_math = NULL;
179 regs->sr |= SR_FD;
180 }
181
182 err |= __copy_to_user(&sc->sc_fpregs[0], ¤t->thread.xstate->hardfpu,
183 (sizeof(long long) * 32) + (sizeof(int) * 1));
184 clear_used_math();
185
186 return err;
187}
188#else
189static inline int
190restore_sigcontext_fpu(struct pt_regs *regs, struct sigcontext __user *sc)
191{
192 return 0;
193}
194static inline int
195setup_sigcontext_fpu(struct pt_regs *regs, struct sigcontext __user *sc)
196{
197 return 0;
198}
199#endif
200
201static int
202restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, long long *r2_p)
203{
204 unsigned int err = 0;
205 unsigned long long current_sr, new_sr;
206#define SR_MASK 0xffff8cfd
207
208#define COPY(x) err |= __get_user(regs->x, &sc->sc_##x)
209
210 COPY(regs[0]); COPY(regs[1]); COPY(regs[2]); COPY(regs[3]);
211 COPY(regs[4]); COPY(regs[5]); COPY(regs[6]); COPY(regs[7]);
212 COPY(regs[8]); COPY(regs[9]); COPY(regs[10]); COPY(regs[11]);
213 COPY(regs[12]); COPY(regs[13]); COPY(regs[14]); COPY(regs[15]);
214 COPY(regs[16]); COPY(regs[17]); COPY(regs[18]); COPY(regs[19]);
215 COPY(regs[20]); COPY(regs[21]); COPY(regs[22]); COPY(regs[23]);
216 COPY(regs[24]); COPY(regs[25]); COPY(regs[26]); COPY(regs[27]);
217 COPY(regs[28]); COPY(regs[29]); COPY(regs[30]); COPY(regs[31]);
218 COPY(regs[32]); COPY(regs[33]); COPY(regs[34]); COPY(regs[35]);
219 COPY(regs[36]); COPY(regs[37]); COPY(regs[38]); COPY(regs[39]);
220 COPY(regs[40]); COPY(regs[41]); COPY(regs[42]); COPY(regs[43]);
221 COPY(regs[44]); COPY(regs[45]); COPY(regs[46]); COPY(regs[47]);
222 COPY(regs[48]); COPY(regs[49]); COPY(regs[50]); COPY(regs[51]);
223 COPY(regs[52]); COPY(regs[53]); COPY(regs[54]); COPY(regs[55]);
224 COPY(regs[56]); COPY(regs[57]); COPY(regs[58]); COPY(regs[59]);
225 COPY(regs[60]); COPY(regs[61]); COPY(regs[62]);
226 COPY(tregs[0]); COPY(tregs[1]); COPY(tregs[2]); COPY(tregs[3]);
227 COPY(tregs[4]); COPY(tregs[5]); COPY(tregs[6]); COPY(tregs[7]);
228
229 /* Prevent the signal handler manipulating SR in a way that can
230 crash the kernel. i.e. only allow S, Q, M, PR, SZ, FR to be
231 modified */
232 current_sr = regs->sr;
233 err |= __get_user(new_sr, &sc->sc_sr);
234 regs->sr &= SR_MASK;
235 regs->sr |= (new_sr & ~SR_MASK);
236
237 COPY(pc);
238
239#undef COPY
240
241 /* Must do this last in case it sets regs->sr.fd (i.e. after rest of sr
242 * has been restored above.) */
243 err |= restore_sigcontext_fpu(regs, sc);
244
245 regs->syscall_nr = -1; /* disable syscall checks */
246 err |= __get_user(*r2_p, &sc->sc_regs[REG_RET]);
247 return err;
248}
249
250asmlinkage int sys_sigreturn(unsigned long r2, unsigned long r3,
251 unsigned long r4, unsigned long r5,
252 unsigned long r6, unsigned long r7,
253 struct pt_regs * regs)
254{
255 struct sigframe __user *frame = (struct sigframe __user *) (long) REF_REG_SP;
256 sigset_t set;
257 long long ret;
258
259 /* Always make any pending restarted system calls return -EINTR */
260 current->restart_block.fn = do_no_restart_syscall;
261
262 if (!access_ok(frame, sizeof(*frame)))
263 goto badframe;
264
265 if (__get_user(set.sig[0], &frame->sc.oldmask)
266 || (_NSIG_WORDS > 1
267 && __copy_from_user(&set.sig[1], &frame->extramask,
268 sizeof(frame->extramask))))
269 goto badframe;
270
271 set_current_blocked(&set);
272
273 if (restore_sigcontext(regs, &frame->sc, &ret))
274 goto badframe;
275 regs->pc -= 4;
276
277 return (int) ret;
278
279badframe:
280 force_sig(SIGSEGV);
281 return 0;
282}
283
284asmlinkage int sys_rt_sigreturn(unsigned long r2, unsigned long r3,
285 unsigned long r4, unsigned long r5,
286 unsigned long r6, unsigned long r7,
287 struct pt_regs * regs)
288{
289 struct rt_sigframe __user *frame = (struct rt_sigframe __user *) (long) REF_REG_SP;
290 sigset_t set;
291 long long ret;
292
293 /* Always make any pending restarted system calls return -EINTR */
294 current->restart_block.fn = do_no_restart_syscall;
295
296 if (!access_ok(frame, sizeof(*frame)))
297 goto badframe;
298
299 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
300 goto badframe;
301
302 set_current_blocked(&set);
303
304 if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &ret))
305 goto badframe;
306 regs->pc -= 4;
307
308 if (restore_altstack(&frame->uc.uc_stack))
309 goto badframe;
310
311 return (int) ret;
312
313badframe:
314 force_sig(SIGSEGV);
315 return 0;
316}
317
318/*
319 * Set up a signal frame.
320 */
321static int
322setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
323 unsigned long mask)
324{
325 int err = 0;
326
327 /* Do this first, otherwise is this sets sr->fd, that value isn't preserved. */
328 err |= setup_sigcontext_fpu(regs, sc);
329
330#define COPY(x) err |= __put_user(regs->x, &sc->sc_##x)
331
332 COPY(regs[0]); COPY(regs[1]); COPY(regs[2]); COPY(regs[3]);
333 COPY(regs[4]); COPY(regs[5]); COPY(regs[6]); COPY(regs[7]);
334 COPY(regs[8]); COPY(regs[9]); COPY(regs[10]); COPY(regs[11]);
335 COPY(regs[12]); COPY(regs[13]); COPY(regs[14]); COPY(regs[15]);
336 COPY(regs[16]); COPY(regs[17]); COPY(regs[18]); COPY(regs[19]);
337 COPY(regs[20]); COPY(regs[21]); COPY(regs[22]); COPY(regs[23]);
338 COPY(regs[24]); COPY(regs[25]); COPY(regs[26]); COPY(regs[27]);
339 COPY(regs[28]); COPY(regs[29]); COPY(regs[30]); COPY(regs[31]);
340 COPY(regs[32]); COPY(regs[33]); COPY(regs[34]); COPY(regs[35]);
341 COPY(regs[36]); COPY(regs[37]); COPY(regs[38]); COPY(regs[39]);
342 COPY(regs[40]); COPY(regs[41]); COPY(regs[42]); COPY(regs[43]);
343 COPY(regs[44]); COPY(regs[45]); COPY(regs[46]); COPY(regs[47]);
344 COPY(regs[48]); COPY(regs[49]); COPY(regs[50]); COPY(regs[51]);
345 COPY(regs[52]); COPY(regs[53]); COPY(regs[54]); COPY(regs[55]);
346 COPY(regs[56]); COPY(regs[57]); COPY(regs[58]); COPY(regs[59]);
347 COPY(regs[60]); COPY(regs[61]); COPY(regs[62]);
348 COPY(tregs[0]); COPY(tregs[1]); COPY(tregs[2]); COPY(tregs[3]);
349 COPY(tregs[4]); COPY(tregs[5]); COPY(tregs[6]); COPY(tregs[7]);
350 COPY(sr); COPY(pc);
351
352#undef COPY
353
354 err |= __put_user(mask, &sc->oldmask);
355
356 return err;
357}
358
359/*
360 * Determine which stack to use..
361 */
362static inline void __user *
363get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size)
364{
365 if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && ! sas_ss_flags(sp))
366 sp = current->sas_ss_sp + current->sas_ss_size;
367
368 return (void __user *)((sp - frame_size) & -8ul);
369}
370
371void sa_default_restorer(void); /* See comments below */
372void sa_default_rt_restorer(void); /* See comments below */
373
374static int setup_frame(struct ksignal *ksig, sigset_t *set, struct pt_regs *regs)
375{
376 struct sigframe __user *frame;
377 int err = 0, sig = ksig->sig;
378 int signal;
379
380 frame = get_sigframe(&ksig->ka, regs->regs[REG_SP], sizeof(*frame));
381
382 if (!access_ok(frame, sizeof(*frame)))
383 return -EFAULT;
384
385 err |= setup_sigcontext(&frame->sc, regs, set->sig[0]);
386
387 /* Give up earlier as i386, in case */
388 if (err)
389 return -EFAULT;
390
391 if (_NSIG_WORDS > 1) {
392 err |= __copy_to_user(frame->extramask, &set->sig[1],
393 sizeof(frame->extramask)); }
394
395 /* Give up earlier as i386, in case */
396 if (err)
397 return -EFAULT;
398
399 /* Set up to return from userspace. If provided, use a stub
400 already in userspace. */
401 if (ksig->ka.sa.sa_flags & SA_RESTORER) {
402 /*
403 * On SH5 all edited pointers are subject to NEFF
404 */
405 DEREF_REG_PR = neff_sign_extend((unsigned long)
406 ksig->ka->sa.sa_restorer | 0x1);
407 } else {
408 /*
409 * Different approach on SH5.
410 * . Endianness independent asm code gets placed in entry.S .
411 * This is limited to four ASM instructions corresponding
412 * to two long longs in size.
413 * . err checking is done on the else branch only
414 * . flush_icache_range() is called upon __put_user() only
415 * . all edited pointers are subject to NEFF
416 * . being code, linker turns ShMedia bit on, always
417 * dereference index -1.
418 */
419 DEREF_REG_PR = neff_sign_extend((unsigned long)
420 frame->retcode | 0x01);
421
422 if (__copy_to_user(frame->retcode,
423 (void *)((unsigned long)sa_default_restorer & (~1)), 16) != 0)
424 return -EFAULT;
425
426 /* Cohere the trampoline with the I-cache. */
427 flush_cache_sigtramp(DEREF_REG_PR-1);
428 }
429
430 /*
431 * Set up registers for signal handler.
432 * All edited pointers are subject to NEFF.
433 */
434 regs->regs[REG_SP] = neff_sign_extend((unsigned long)frame);
435 regs->regs[REG_ARG1] = sig; /* Arg for signal handler */
436
437 /* FIXME:
438 The glibc profiling support for SH-5 needs to be passed a sigcontext
439 so it can retrieve the PC. At some point during 2003 the glibc
440 support was changed to receive the sigcontext through the 2nd
441 argument, but there are still versions of libc.so in use that use
442 the 3rd argument. Until libc.so is stabilised, pass the sigcontext
443 through both 2nd and 3rd arguments.
444 */
445
446 regs->regs[REG_ARG2] = (unsigned long long)(unsigned long)(signed long)&frame->sc;
447 regs->regs[REG_ARG3] = (unsigned long long)(unsigned long)(signed long)&frame->sc;
448
449 regs->pc = neff_sign_extend((unsigned long)ksig->ka.sa.sa_handler);
450
451 /* Broken %016Lx */
452 pr_debug("SIG deliver (#%d,%s:%d): sp=%p pc=%08Lx%08Lx link=%08Lx%08Lx\n",
453 sig, current->comm, current->pid, frame,
454 regs->pc >> 32, regs->pc & 0xffffffff,
455 DEREF_REG_PR >> 32, DEREF_REG_PR & 0xffffffff);
456
457 return 0;
458}
459
460static int setup_rt_frame(struct ksignal *kig, sigset_t *set,
461 struct pt_regs *regs)
462{
463 struct rt_sigframe __user *frame;
464 int err = 0, sig = ksig->sig;
465
466 frame = get_sigframe(&ksig->ka, regs->regs[REG_SP], sizeof(*frame));
467
468 if (!access_ok(frame, sizeof(*frame)))
469 return -EFAULT;
470
471 err |= __put_user(&frame->info, &frame->pinfo);
472 err |= __put_user(&frame->uc, &frame->puc);
473 err |= copy_siginfo_to_user(&frame->info, &ksig->info);
474
475 /* Give up earlier as i386, in case */
476 if (err)
477 return -EFAULT;
478
479 /* Create the ucontext. */
480 err |= __put_user(0, &frame->uc.uc_flags);
481 err |= __put_user(0, &frame->uc.uc_link);
482 err |= __save_altstack(&frame->uc.uc_stack, regs->regs[REG_SP]);
483 err |= setup_sigcontext(&frame->uc.uc_mcontext,
484 regs, set->sig[0]);
485 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
486
487 /* Give up earlier as i386, in case */
488 if (err)
489 return -EFAULT;
490
491 /* Set up to return from userspace. If provided, use a stub
492 already in userspace. */
493 if (ksig->ka.sa.sa_flags & SA_RESTORER) {
494 /*
495 * On SH5 all edited pointers are subject to NEFF
496 */
497 DEREF_REG_PR = neff_sign_extend((unsigned long)
498 ksig->ka.sa.sa_restorer | 0x1);
499 } else {
500 /*
501 * Different approach on SH5.
502 * . Endianness independent asm code gets placed in entry.S .
503 * This is limited to four ASM instructions corresponding
504 * to two long longs in size.
505 * . err checking is done on the else branch only
506 * . flush_icache_range() is called upon __put_user() only
507 * . all edited pointers are subject to NEFF
508 * . being code, linker turns ShMedia bit on, always
509 * dereference index -1.
510 */
511 DEREF_REG_PR = neff_sign_extend((unsigned long)
512 frame->retcode | 0x01);
513
514 if (__copy_to_user(frame->retcode,
515 (void *)((unsigned long)sa_default_rt_restorer & (~1)), 16) != 0)
516 return -EFAULT;
517
518 /* Cohere the trampoline with the I-cache. */
519 flush_icache_range(DEREF_REG_PR-1, DEREF_REG_PR-1+15);
520 }
521
522 /*
523 * Set up registers for signal handler.
524 * All edited pointers are subject to NEFF.
525 */
526 regs->regs[REG_SP] = neff_sign_extend((unsigned long)frame);
527 regs->regs[REG_ARG1] = sig; /* Arg for signal handler */
528 regs->regs[REG_ARG2] = (unsigned long long)(unsigned long)(signed long)&frame->info;
529 regs->regs[REG_ARG3] = (unsigned long long)(unsigned long)(signed long)&frame->uc.uc_mcontext;
530 regs->pc = neff_sign_extend((unsigned long)ksig->ka.sa.sa_handler);
531
532 pr_debug("SIG deliver (#%d,%s:%d): sp=%p pc=%08Lx%08Lx link=%08Lx%08Lx\n",
533 sig, current->comm, current->pid, frame,
534 regs->pc >> 32, regs->pc & 0xffffffff,
535 DEREF_REG_PR >> 32, DEREF_REG_PR & 0xffffffff);
536
537 return 0;
538}
539
540/*
541 * OK, we're invoking a handler
542 */
543static void
544handle_signal(struct ksignal *ksig, struct pt_regs *regs)
545{
546 sigset_t *oldset = sigmask_to_save();
547 int ret;
548
549 /* Set up the stack frame */
550 if (ksig->ka.sa.sa_flags & SA_SIGINFO)
551 ret = setup_rt_frame(ksig, oldset, regs);
552 else
553 ret = setup_frame(ksig, oldset, regs);
554
555 signal_setup_done(ret, ksig, test_thread_flag(TIF_SINGLESTEP));
556}
557
558asmlinkage void do_notify_resume(struct pt_regs *regs, unsigned long thread_info_flags)
559{
560 if (thread_info_flags & _TIF_SIGPENDING)
561 do_signal(regs);
562
563 if (thread_info_flags & _TIF_NOTIFY_RESUME) {
564 clear_thread_flag(TIF_NOTIFY_RESUME);
565 tracehook_notify_resume(regs);
566 }
567}
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/freezer.h>
22#include <linux/ptrace.h>
23#include <linux/unistd.h>
24#include <linux/stddef.h>
25#include <linux/tracehook.h>
26#include <asm/ucontext.h>
27#include <asm/uaccess.h>
28#include <asm/pgtable.h>
29#include <asm/cacheflush.h>
30#include <asm/fpu.h>
31
32#define REG_RET 9
33#define REG_ARG1 2
34#define REG_ARG2 3
35#define REG_ARG3 4
36#define REG_SP 15
37#define REG_PR 18
38#define REF_REG_RET regs->regs[REG_RET]
39#define REF_REG_SP regs->regs[REG_SP]
40#define DEREF_REG_PR regs->regs[REG_PR]
41
42#define DEBUG_SIG 0
43
44#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
45
46static int
47handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
48 sigset_t *oldset, struct pt_regs * regs);
49
50static inline void
51handle_syscall_restart(struct pt_regs *regs, struct sigaction *sa)
52{
53 /* If we're not from a syscall, bail out */
54 if (regs->syscall_nr < 0)
55 return;
56
57 /* check for system call restart.. */
58 switch (regs->regs[REG_RET]) {
59 case -ERESTART_RESTARTBLOCK:
60 case -ERESTARTNOHAND:
61 no_system_call_restart:
62 regs->regs[REG_RET] = -EINTR;
63 break;
64
65 case -ERESTARTSYS:
66 if (!(sa->sa_flags & SA_RESTART))
67 goto no_system_call_restart;
68 /* fallthrough */
69 case -ERESTARTNOINTR:
70 /* Decode syscall # */
71 regs->regs[REG_RET] = regs->syscall_nr;
72 regs->pc -= 4;
73 break;
74 }
75}
76
77/*
78 * Note that 'init' is a special process: it doesn't get signals it doesn't
79 * want to handle. Thus you cannot kill init even with a SIGKILL even by
80 * mistake.
81 *
82 * Note that we go through the signals twice: once to check the signals that
83 * the kernel can handle, and then we build all the user-level signal handling
84 * stack-frames in one go after that.
85 */
86static int do_signal(struct pt_regs *regs, sigset_t *oldset)
87{
88 siginfo_t info;
89 int signr;
90 struct k_sigaction ka;
91
92 /*
93 * We want the common case to go fast, which
94 * is why we may in certain cases get here from
95 * kernel mode. Just return without doing anything
96 * if so.
97 */
98 if (!user_mode(regs))
99 return 1;
100
101 if (try_to_freeze())
102 goto no_signal;
103
104 if (current_thread_info()->status & TS_RESTORE_SIGMASK)
105 oldset = ¤t->saved_sigmask;
106 else if (!oldset)
107 oldset = ¤t->blocked;
108
109 signr = get_signal_to_deliver(&info, &ka, regs, 0);
110 if (signr > 0) {
111 handle_syscall_restart(regs, &ka.sa);
112
113 /* Whee! Actually deliver the signal. */
114 if (handle_signal(signr, &info, &ka, oldset, regs) == 0) {
115 /*
116 * If a signal was successfully delivered, the
117 * saved sigmask is in its frame, and we can
118 * clear the TS_RESTORE_SIGMASK flag.
119 */
120 current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
121
122 tracehook_signal_handler(signr, &info, &ka, regs,
123 test_thread_flag(TIF_SINGLESTEP));
124 return 1;
125 }
126 }
127
128no_signal:
129 /* Did we come from a system call? */
130 if (regs->syscall_nr >= 0) {
131 /* Restart the system call - no handlers present */
132 switch (regs->regs[REG_RET]) {
133 case -ERESTARTNOHAND:
134 case -ERESTARTSYS:
135 case -ERESTARTNOINTR:
136 /* Decode Syscall # */
137 regs->regs[REG_RET] = regs->syscall_nr;
138 regs->pc -= 4;
139 break;
140
141 case -ERESTART_RESTARTBLOCK:
142 regs->regs[REG_RET] = __NR_restart_syscall;
143 regs->pc -= 4;
144 break;
145 }
146 }
147
148 /* No signal to deliver -- put the saved sigmask back */
149 if (current_thread_info()->status & TS_RESTORE_SIGMASK) {
150 current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
151 sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL);
152 }
153
154 return 0;
155}
156
157/*
158 * Atomically swap in the new signal mask, and wait for a signal.
159 */
160asmlinkage int
161sys_sigsuspend(old_sigset_t mask,
162 unsigned long r3, unsigned long r4, unsigned long r5,
163 unsigned long r6, unsigned long r7,
164 struct pt_regs * regs)
165{
166 sigset_t saveset;
167
168 mask &= _BLOCKABLE;
169 spin_lock_irq(¤t->sighand->siglock);
170 saveset = current->blocked;
171 siginitset(¤t->blocked, mask);
172 recalc_sigpending();
173 spin_unlock_irq(¤t->sighand->siglock);
174
175 REF_REG_RET = -EINTR;
176 while (1) {
177 current->state = TASK_INTERRUPTIBLE;
178 schedule();
179 set_restore_sigmask();
180 regs->pc += 4; /* because sys_sigreturn decrements the pc */
181 if (do_signal(regs, &saveset)) {
182 /* pc now points at signal handler. Need to decrement
183 it because entry.S will increment it. */
184 regs->pc -= 4;
185 return -EINTR;
186 }
187 }
188}
189
190asmlinkage int
191sys_rt_sigsuspend(sigset_t *unewset, size_t sigsetsize,
192 unsigned long r4, unsigned long r5, unsigned long r6,
193 unsigned long r7,
194 struct pt_regs * regs)
195{
196 sigset_t saveset, newset;
197
198 /* XXX: Don't preclude handling different sized sigset_t's. */
199 if (sigsetsize != sizeof(sigset_t))
200 return -EINVAL;
201
202 if (copy_from_user(&newset, unewset, sizeof(newset)))
203 return -EFAULT;
204 sigdelsetmask(&newset, ~_BLOCKABLE);
205 spin_lock_irq(¤t->sighand->siglock);
206 saveset = current->blocked;
207 current->blocked = newset;
208 recalc_sigpending();
209 spin_unlock_irq(¤t->sighand->siglock);
210
211 REF_REG_RET = -EINTR;
212 while (1) {
213 current->state = TASK_INTERRUPTIBLE;
214 schedule();
215 regs->pc += 4; /* because sys_sigreturn decrements the pc */
216 if (do_signal(regs, &saveset)) {
217 /* pc now points at signal handler. Need to decrement
218 it because entry.S will increment it. */
219 regs->pc -= 4;
220 return -EINTR;
221 }
222 }
223}
224
225asmlinkage int
226sys_sigaction(int sig, const struct old_sigaction __user *act,
227 struct old_sigaction __user *oact)
228{
229 struct k_sigaction new_ka, old_ka;
230 int ret;
231
232 if (act) {
233 old_sigset_t mask;
234 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
235 __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
236 __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
237 return -EFAULT;
238 __get_user(new_ka.sa.sa_flags, &act->sa_flags);
239 __get_user(mask, &act->sa_mask);
240 siginitset(&new_ka.sa.sa_mask, mask);
241 }
242
243 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
244
245 if (!ret && oact) {
246 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
247 __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
248 __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
249 return -EFAULT;
250 __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
251 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
252 }
253
254 return ret;
255}
256
257asmlinkage int
258sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
259 unsigned long r4, unsigned long r5, unsigned long r6,
260 unsigned long r7,
261 struct pt_regs * regs)
262{
263 return do_sigaltstack(uss, uoss, REF_REG_SP);
264}
265
266/*
267 * Do a signal return; undo the signal stack.
268 */
269struct sigframe {
270 struct sigcontext sc;
271 unsigned long extramask[_NSIG_WORDS-1];
272 long long retcode[2];
273};
274
275struct rt_sigframe {
276 struct siginfo __user *pinfo;
277 void *puc;
278 struct siginfo info;
279 struct ucontext uc;
280 long long retcode[2];
281};
282
283#ifdef CONFIG_SH_FPU
284static inline int
285restore_sigcontext_fpu(struct pt_regs *regs, struct sigcontext __user *sc)
286{
287 int err = 0;
288 int fpvalid;
289
290 err |= __get_user (fpvalid, &sc->sc_fpvalid);
291 conditional_used_math(fpvalid);
292 if (! fpvalid)
293 return err;
294
295 if (current == last_task_used_math) {
296 last_task_used_math = NULL;
297 regs->sr |= SR_FD;
298 }
299
300 err |= __copy_from_user(¤t->thread.xstate->hardfpu, &sc->sc_fpregs[0],
301 (sizeof(long long) * 32) + (sizeof(int) * 1));
302
303 return err;
304}
305
306static inline int
307setup_sigcontext_fpu(struct pt_regs *regs, struct sigcontext __user *sc)
308{
309 int err = 0;
310 int fpvalid;
311
312 fpvalid = !!used_math();
313 err |= __put_user(fpvalid, &sc->sc_fpvalid);
314 if (! fpvalid)
315 return err;
316
317 if (current == last_task_used_math) {
318 enable_fpu();
319 save_fpu(current);
320 disable_fpu();
321 last_task_used_math = NULL;
322 regs->sr |= SR_FD;
323 }
324
325 err |= __copy_to_user(&sc->sc_fpregs[0], ¤t->thread.xstate->hardfpu,
326 (sizeof(long long) * 32) + (sizeof(int) * 1));
327 clear_used_math();
328
329 return err;
330}
331#else
332static inline int
333restore_sigcontext_fpu(struct pt_regs *regs, struct sigcontext __user *sc)
334{
335 return 0;
336}
337static inline int
338setup_sigcontext_fpu(struct pt_regs *regs, struct sigcontext __user *sc)
339{
340 return 0;
341}
342#endif
343
344static int
345restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, long long *r2_p)
346{
347 unsigned int err = 0;
348 unsigned long long current_sr, new_sr;
349#define SR_MASK 0xffff8cfd
350
351#define COPY(x) err |= __get_user(regs->x, &sc->sc_##x)
352
353 COPY(regs[0]); COPY(regs[1]); COPY(regs[2]); COPY(regs[3]);
354 COPY(regs[4]); COPY(regs[5]); COPY(regs[6]); COPY(regs[7]);
355 COPY(regs[8]); COPY(regs[9]); COPY(regs[10]); COPY(regs[11]);
356 COPY(regs[12]); COPY(regs[13]); COPY(regs[14]); COPY(regs[15]);
357 COPY(regs[16]); COPY(regs[17]); COPY(regs[18]); COPY(regs[19]);
358 COPY(regs[20]); COPY(regs[21]); COPY(regs[22]); COPY(regs[23]);
359 COPY(regs[24]); COPY(regs[25]); COPY(regs[26]); COPY(regs[27]);
360 COPY(regs[28]); COPY(regs[29]); COPY(regs[30]); COPY(regs[31]);
361 COPY(regs[32]); COPY(regs[33]); COPY(regs[34]); COPY(regs[35]);
362 COPY(regs[36]); COPY(regs[37]); COPY(regs[38]); COPY(regs[39]);
363 COPY(regs[40]); COPY(regs[41]); COPY(regs[42]); COPY(regs[43]);
364 COPY(regs[44]); COPY(regs[45]); COPY(regs[46]); COPY(regs[47]);
365 COPY(regs[48]); COPY(regs[49]); COPY(regs[50]); COPY(regs[51]);
366 COPY(regs[52]); COPY(regs[53]); COPY(regs[54]); COPY(regs[55]);
367 COPY(regs[56]); COPY(regs[57]); COPY(regs[58]); COPY(regs[59]);
368 COPY(regs[60]); COPY(regs[61]); COPY(regs[62]);
369 COPY(tregs[0]); COPY(tregs[1]); COPY(tregs[2]); COPY(tregs[3]);
370 COPY(tregs[4]); COPY(tregs[5]); COPY(tregs[6]); COPY(tregs[7]);
371
372 /* Prevent the signal handler manipulating SR in a way that can
373 crash the kernel. i.e. only allow S, Q, M, PR, SZ, FR to be
374 modified */
375 current_sr = regs->sr;
376 err |= __get_user(new_sr, &sc->sc_sr);
377 regs->sr &= SR_MASK;
378 regs->sr |= (new_sr & ~SR_MASK);
379
380 COPY(pc);
381
382#undef COPY
383
384 /* Must do this last in case it sets regs->sr.fd (i.e. after rest of sr
385 * has been restored above.) */
386 err |= restore_sigcontext_fpu(regs, sc);
387
388 regs->syscall_nr = -1; /* disable syscall checks */
389 err |= __get_user(*r2_p, &sc->sc_regs[REG_RET]);
390 return err;
391}
392
393asmlinkage int sys_sigreturn(unsigned long r2, unsigned long r3,
394 unsigned long r4, unsigned long r5,
395 unsigned long r6, unsigned long r7,
396 struct pt_regs * regs)
397{
398 struct sigframe __user *frame = (struct sigframe __user *) (long) REF_REG_SP;
399 sigset_t set;
400 long long ret;
401
402 /* Always make any pending restarted system calls return -EINTR */
403 current_thread_info()->restart_block.fn = do_no_restart_syscall;
404
405 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
406 goto badframe;
407
408 if (__get_user(set.sig[0], &frame->sc.oldmask)
409 || (_NSIG_WORDS > 1
410 && __copy_from_user(&set.sig[1], &frame->extramask,
411 sizeof(frame->extramask))))
412 goto badframe;
413
414 sigdelsetmask(&set, ~_BLOCKABLE);
415
416 spin_lock_irq(¤t->sighand->siglock);
417 current->blocked = set;
418 recalc_sigpending();
419 spin_unlock_irq(¤t->sighand->siglock);
420
421 if (restore_sigcontext(regs, &frame->sc, &ret))
422 goto badframe;
423 regs->pc -= 4;
424
425 return (int) ret;
426
427badframe:
428 force_sig(SIGSEGV, current);
429 return 0;
430}
431
432asmlinkage int sys_rt_sigreturn(unsigned long r2, unsigned long r3,
433 unsigned long r4, unsigned long r5,
434 unsigned long r6, unsigned long r7,
435 struct pt_regs * regs)
436{
437 struct rt_sigframe __user *frame = (struct rt_sigframe __user *) (long) REF_REG_SP;
438 sigset_t set;
439 stack_t __user st;
440 long long ret;
441
442 /* Always make any pending restarted system calls return -EINTR */
443 current_thread_info()->restart_block.fn = do_no_restart_syscall;
444
445 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
446 goto badframe;
447
448 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
449 goto badframe;
450
451 sigdelsetmask(&set, ~_BLOCKABLE);
452 spin_lock_irq(¤t->sighand->siglock);
453 current->blocked = set;
454 recalc_sigpending();
455 spin_unlock_irq(¤t->sighand->siglock);
456
457 if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &ret))
458 goto badframe;
459 regs->pc -= 4;
460
461 if (__copy_from_user(&st, &frame->uc.uc_stack, sizeof(st)))
462 goto badframe;
463 /* It is more difficult to avoid calling this function than to
464 call it and ignore errors. */
465 do_sigaltstack(&st, NULL, REF_REG_SP);
466
467 return (int) ret;
468
469badframe:
470 force_sig(SIGSEGV, current);
471 return 0;
472}
473
474/*
475 * Set up a signal frame.
476 */
477static int
478setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
479 unsigned long mask)
480{
481 int err = 0;
482
483 /* Do this first, otherwise is this sets sr->fd, that value isn't preserved. */
484 err |= setup_sigcontext_fpu(regs, sc);
485
486#define COPY(x) err |= __put_user(regs->x, &sc->sc_##x)
487
488 COPY(regs[0]); COPY(regs[1]); COPY(regs[2]); COPY(regs[3]);
489 COPY(regs[4]); COPY(regs[5]); COPY(regs[6]); COPY(regs[7]);
490 COPY(regs[8]); COPY(regs[9]); COPY(regs[10]); COPY(regs[11]);
491 COPY(regs[12]); COPY(regs[13]); COPY(regs[14]); COPY(regs[15]);
492 COPY(regs[16]); COPY(regs[17]); COPY(regs[18]); COPY(regs[19]);
493 COPY(regs[20]); COPY(regs[21]); COPY(regs[22]); COPY(regs[23]);
494 COPY(regs[24]); COPY(regs[25]); COPY(regs[26]); COPY(regs[27]);
495 COPY(regs[28]); COPY(regs[29]); COPY(regs[30]); COPY(regs[31]);
496 COPY(regs[32]); COPY(regs[33]); COPY(regs[34]); COPY(regs[35]);
497 COPY(regs[36]); COPY(regs[37]); COPY(regs[38]); COPY(regs[39]);
498 COPY(regs[40]); COPY(regs[41]); COPY(regs[42]); COPY(regs[43]);
499 COPY(regs[44]); COPY(regs[45]); COPY(regs[46]); COPY(regs[47]);
500 COPY(regs[48]); COPY(regs[49]); COPY(regs[50]); COPY(regs[51]);
501 COPY(regs[52]); COPY(regs[53]); COPY(regs[54]); COPY(regs[55]);
502 COPY(regs[56]); COPY(regs[57]); COPY(regs[58]); COPY(regs[59]);
503 COPY(regs[60]); COPY(regs[61]); COPY(regs[62]);
504 COPY(tregs[0]); COPY(tregs[1]); COPY(tregs[2]); COPY(tregs[3]);
505 COPY(tregs[4]); COPY(tregs[5]); COPY(tregs[6]); COPY(tregs[7]);
506 COPY(sr); COPY(pc);
507
508#undef COPY
509
510 err |= __put_user(mask, &sc->oldmask);
511
512 return err;
513}
514
515/*
516 * Determine which stack to use..
517 */
518static inline void __user *
519get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size)
520{
521 if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && ! sas_ss_flags(sp))
522 sp = current->sas_ss_sp + current->sas_ss_size;
523
524 return (void __user *)((sp - frame_size) & -8ul);
525}
526
527void sa_default_restorer(void); /* See comments below */
528void sa_default_rt_restorer(void); /* See comments below */
529
530static int setup_frame(int sig, struct k_sigaction *ka,
531 sigset_t *set, struct pt_regs *regs)
532{
533 struct sigframe __user *frame;
534 int err = 0;
535 int signal;
536
537 frame = get_sigframe(ka, regs->regs[REG_SP], sizeof(*frame));
538
539 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
540 goto give_sigsegv;
541
542 signal = current_thread_info()->exec_domain
543 && current_thread_info()->exec_domain->signal_invmap
544 && sig < 32
545 ? current_thread_info()->exec_domain->signal_invmap[sig]
546 : sig;
547
548 err |= setup_sigcontext(&frame->sc, regs, set->sig[0]);
549
550 /* Give up earlier as i386, in case */
551 if (err)
552 goto give_sigsegv;
553
554 if (_NSIG_WORDS > 1) {
555 err |= __copy_to_user(frame->extramask, &set->sig[1],
556 sizeof(frame->extramask)); }
557
558 /* Give up earlier as i386, in case */
559 if (err)
560 goto give_sigsegv;
561
562 /* Set up to return from userspace. If provided, use a stub
563 already in userspace. */
564 if (ka->sa.sa_flags & SA_RESTORER) {
565 /*
566 * On SH5 all edited pointers are subject to NEFF
567 */
568 DEREF_REG_PR = neff_sign_extend((unsigned long)
569 ka->sa.sa_restorer | 0x1);
570 } else {
571 /*
572 * Different approach on SH5.
573 * . Endianness independent asm code gets placed in entry.S .
574 * This is limited to four ASM instructions corresponding
575 * to two long longs in size.
576 * . err checking is done on the else branch only
577 * . flush_icache_range() is called upon __put_user() only
578 * . all edited pointers are subject to NEFF
579 * . being code, linker turns ShMedia bit on, always
580 * dereference index -1.
581 */
582 DEREF_REG_PR = neff_sign_extend((unsigned long)
583 frame->retcode | 0x01);
584
585 if (__copy_to_user(frame->retcode,
586 (void *)((unsigned long)sa_default_restorer & (~1)), 16) != 0)
587 goto give_sigsegv;
588
589 /* Cohere the trampoline with the I-cache. */
590 flush_cache_sigtramp(DEREF_REG_PR-1);
591 }
592
593 /*
594 * Set up registers for signal handler.
595 * All edited pointers are subject to NEFF.
596 */
597 regs->regs[REG_SP] = neff_sign_extend((unsigned long)frame);
598 regs->regs[REG_ARG1] = signal; /* Arg for signal handler */
599
600 /* FIXME:
601 The glibc profiling support for SH-5 needs to be passed a sigcontext
602 so it can retrieve the PC. At some point during 2003 the glibc
603 support was changed to receive the sigcontext through the 2nd
604 argument, but there are still versions of libc.so in use that use
605 the 3rd argument. Until libc.so is stabilised, pass the sigcontext
606 through both 2nd and 3rd arguments.
607 */
608
609 regs->regs[REG_ARG2] = (unsigned long long)(unsigned long)(signed long)&frame->sc;
610 regs->regs[REG_ARG3] = (unsigned long long)(unsigned long)(signed long)&frame->sc;
611
612 regs->pc = neff_sign_extend((unsigned long)ka->sa.sa_handler);
613
614 set_fs(USER_DS);
615
616 /* Broken %016Lx */
617 pr_debug("SIG deliver (#%d,%s:%d): sp=%p pc=%08Lx%08Lx link=%08Lx%08Lx\n",
618 signal, current->comm, current->pid, frame,
619 regs->pc >> 32, regs->pc & 0xffffffff,
620 DEREF_REG_PR >> 32, DEREF_REG_PR & 0xffffffff);
621
622 return 0;
623
624give_sigsegv:
625 force_sigsegv(sig, current);
626 return -EFAULT;
627}
628
629static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
630 sigset_t *set, struct pt_regs *regs)
631{
632 struct rt_sigframe __user *frame;
633 int err = 0;
634 int signal;
635
636 frame = get_sigframe(ka, regs->regs[REG_SP], sizeof(*frame));
637
638 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
639 goto give_sigsegv;
640
641 signal = current_thread_info()->exec_domain
642 && current_thread_info()->exec_domain->signal_invmap
643 && sig < 32
644 ? current_thread_info()->exec_domain->signal_invmap[sig]
645 : sig;
646
647 err |= __put_user(&frame->info, &frame->pinfo);
648 err |= __put_user(&frame->uc, &frame->puc);
649 err |= copy_siginfo_to_user(&frame->info, info);
650
651 /* Give up earlier as i386, in case */
652 if (err)
653 goto give_sigsegv;
654
655 /* Create the ucontext. */
656 err |= __put_user(0, &frame->uc.uc_flags);
657 err |= __put_user(0, &frame->uc.uc_link);
658 err |= __put_user((void *)current->sas_ss_sp,
659 &frame->uc.uc_stack.ss_sp);
660 err |= __put_user(sas_ss_flags(regs->regs[REG_SP]),
661 &frame->uc.uc_stack.ss_flags);
662 err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
663 err |= setup_sigcontext(&frame->uc.uc_mcontext,
664 regs, set->sig[0]);
665 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
666
667 /* Give up earlier as i386, in case */
668 if (err)
669 goto give_sigsegv;
670
671 /* Set up to return from userspace. If provided, use a stub
672 already in userspace. */
673 if (ka->sa.sa_flags & SA_RESTORER) {
674 /*
675 * On SH5 all edited pointers are subject to NEFF
676 */
677 DEREF_REG_PR = neff_sign_extend((unsigned long)
678 ka->sa.sa_restorer | 0x1);
679 } else {
680 /*
681 * Different approach on SH5.
682 * . Endianness independent asm code gets placed in entry.S .
683 * This is limited to four ASM instructions corresponding
684 * to two long longs in size.
685 * . err checking is done on the else branch only
686 * . flush_icache_range() is called upon __put_user() only
687 * . all edited pointers are subject to NEFF
688 * . being code, linker turns ShMedia bit on, always
689 * dereference index -1.
690 */
691 DEREF_REG_PR = neff_sign_extend((unsigned long)
692 frame->retcode | 0x01);
693
694 if (__copy_to_user(frame->retcode,
695 (void *)((unsigned long)sa_default_rt_restorer & (~1)), 16) != 0)
696 goto give_sigsegv;
697
698 /* Cohere the trampoline with the I-cache. */
699 flush_icache_range(DEREF_REG_PR-1, DEREF_REG_PR-1+15);
700 }
701
702 /*
703 * Set up registers for signal handler.
704 * All edited pointers are subject to NEFF.
705 */
706 regs->regs[REG_SP] = neff_sign_extend((unsigned long)frame);
707 regs->regs[REG_ARG1] = signal; /* Arg for signal handler */
708 regs->regs[REG_ARG2] = (unsigned long long)(unsigned long)(signed long)&frame->info;
709 regs->regs[REG_ARG3] = (unsigned long long)(unsigned long)(signed long)&frame->uc.uc_mcontext;
710 regs->pc = neff_sign_extend((unsigned long)ka->sa.sa_handler);
711
712 set_fs(USER_DS);
713
714 pr_debug("SIG deliver (#%d,%s:%d): sp=%p pc=%08Lx%08Lx link=%08Lx%08Lx\n",
715 signal, current->comm, current->pid, frame,
716 regs->pc >> 32, regs->pc & 0xffffffff,
717 DEREF_REG_PR >> 32, DEREF_REG_PR & 0xffffffff);
718
719 return 0;
720
721give_sigsegv:
722 force_sigsegv(sig, current);
723 return -EFAULT;
724}
725
726/*
727 * OK, we're invoking a handler
728 */
729static int
730handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
731 sigset_t *oldset, struct pt_regs * regs)
732{
733 int ret;
734
735 /* Set up the stack frame */
736 if (ka->sa.sa_flags & SA_SIGINFO)
737 ret = setup_rt_frame(sig, ka, info, oldset, regs);
738 else
739 ret = setup_frame(sig, ka, oldset, regs);
740
741 if (ka->sa.sa_flags & SA_ONESHOT)
742 ka->sa.sa_handler = SIG_DFL;
743
744 if (ret == 0) {
745 spin_lock_irq(¤t->sighand->siglock);
746 sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask);
747 if (!(ka->sa.sa_flags & SA_NODEFER))
748 sigaddset(¤t->blocked,sig);
749 recalc_sigpending();
750 spin_unlock_irq(¤t->sighand->siglock);
751 }
752
753 return ret;
754}
755
756asmlinkage void do_notify_resume(struct pt_regs *regs, unsigned long thread_info_flags)
757{
758 if (thread_info_flags & _TIF_SIGPENDING)
759 do_signal(regs, 0);
760
761 if (thread_info_flags & _TIF_NOTIFY_RESUME) {
762 clear_thread_flag(TIF_NOTIFY_RESUME);
763 tracehook_notify_resume(regs);
764 if (current->replacement_session_keyring)
765 key_replace_session_keyring();
766 }
767}