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most of set_current_blocked() callers want SIGKILL/SIGSTOP removed from set
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / sh / kernel / signal_64.c
CommitLineData
1da177e4 1/*
a23ba435 2 * arch/sh/kernel/signal_64.c
1da177e4
LT		 3 *
4 * Copyright (C) 2000, 2001 Paolo Alberelli
6ac03437 5 * Copyright (C) 2003 - 2008 Paul Mundt
1da177e4
LT		 6 * Copyright (C) 2004 Richard Curnow
7 *
a23ba435
PM		 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.
1da177e4
LT		 11 */
12#include <linux/rwsem.h>
13#include <linux/sched.h>
14#include <linux/mm.h>
15#include <linux/smp.h>
1da177e4
LT		 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>
7dfb7103 21#include <linux/freezer.h>
1da177e4
LT		 22#include <linux/ptrace.h>
23#include <linux/unistd.h>
24#include <linux/stddef.h>
ab99c733 25#include <linux/tracehook.h>
1da177e4
LT		 26#include <asm/ucontext.h>
27#include <asm/uaccess.h>
28#include <asm/pgtable.h>
f7a7b153 29#include <asm/cacheflush.h>
50387b3e 30#include <asm/fpu.h>
1da177e4
LT		 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
a610d6e6 44static void
8a80a5e9 45handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
b7f9a11a 46 struct pt_regs * regs);
8a80a5e9 47
94e2fb3d
PM		 48static inline void
49handle_syscall_restart(struct pt_regs *regs, struct sigaction *sa)
50{
51 /* If we're not from a syscall, bail out */
52 if (regs->syscall_nr < 0)
53 return;
54
55 /* check for system call restart.. */
56 switch (regs->regs[REG_RET]) {
57 case -ERESTART_RESTARTBLOCK:
58 case -ERESTARTNOHAND:
59 no_system_call_restart:
60 regs->regs[REG_RET] = -EINTR;
94e2fb3d
PM		 61 break;
62
63 case -ERESTARTSYS:
64 if (!(sa->sa_flags & SA_RESTART))
65 goto no_system_call_restart;
66 /* fallthrough */
67 case -ERESTARTNOINTR:
68 /* Decode syscall # */
69 regs->regs[REG_RET] = regs->syscall_nr;
70 regs->pc -= 4;
71 break;
72 }
73}
74
ab99c733
PM		 75/*
76 * Note that 'init' is a special process: it doesn't get signals it doesn't
77 * want to handle. Thus you cannot kill init even with a SIGKILL even by
78 * mistake.
79 *
80 * Note that we go through the signals twice: once to check the signals that
81 * the kernel can handle, and then we build all the user-level signal handling
82 * stack-frames in one go after that.
83 */
9ef461ad 84static void do_signal(struct pt_regs *regs)
ab99c733
PM		 85{
86 siginfo_t info;
87 int signr;
88 struct k_sigaction ka;
89
90 /*
91 * We want the common case to go fast, which
92 * is why we may in certain cases get here from
93 * kernel mode. Just return without doing anything
94 * if so.
95 */
96 if (!user_mode(regs))
9ef461ad 97 return;
ab99c733 98
ab99c733 99 signr = get_signal_to_deliver(&info, &ka, regs, 0);
ab99c733 100 if (signr > 0) {
03f07876 101 handle_syscall_restart(regs, &ka.sa);
94e2fb3d 102
ab99c733 103 /* Whee! Actually deliver the signal. */
a610d6e6 104 handle_signal(signr, &info, &ka, regs);
5754f412 105 return;
ab99c733
PM		 106 }
107
ab99c733
PM		 108 /* Did we come from a system call? */
109 if (regs->syscall_nr >= 0) {
110 /* Restart the system call - no handlers present */
111 switch (regs->regs[REG_RET]) {
112 case -ERESTARTNOHAND:
113 case -ERESTARTSYS:
114 case -ERESTARTNOINTR:
115 /* Decode Syscall # */
116 regs->regs[REG_RET] = regs->syscall_nr;
117 regs->pc -= 4;
118 break;
119
120 case -ERESTART_RESTARTBLOCK:
121 regs->regs[REG_RET] = __NR_restart_syscall;
122 regs->pc -= 4;
123 break;
124 }
125 }
126
127 /* No signal to deliver -- put the saved sigmask back */
51a7b448 128 restore_saved_sigmask();
ab99c733 129}
1da177e4
LT		 130
131/*
132 * Atomically swap in the new signal mask, and wait for a signal.
133 */
1da177e4 134asmlinkage int
9ef461ad 135sys_sigsuspend(old_sigset_t mask)
1da177e4 136{
9ef461ad 137 sigset_t blocked;
5e047fa1 138 siginitset(&blocked, mask);
9ef461ad 139 return sigsuspend(&blocked);
1da177e4
LT		 140}
141
142asmlinkage int
143sys_sigaction(int sig, const struct old_sigaction __user *act,
144 struct old_sigaction __user *oact)
145{
146 struct k_sigaction new_ka, old_ka;
147 int ret;
148
149 if (act) {
150 old_sigset_t mask;
151 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
152 __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
a46808e1
AV		 153 __get_user(new_ka.sa.sa_restorer, &act->sa_restorer) ||
154 __get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
155 __get_user(mask, &act->sa_mask))
1da177e4 156 return -EFAULT;
1da177e4
LT		 157 siginitset(&new_ka.sa.sa_mask, mask);
158 }
159
160 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
161
162 if (!ret && oact) {
163 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
164 __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
a46808e1
AV		 165 __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer) ||
166 __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
167 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
1da177e4 168 return -EFAULT;
1da177e4
LT		 169 }
170
171 return ret;
172}
173
174asmlinkage int
175sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
176 unsigned long r4, unsigned long r5, unsigned long r6,
177 unsigned long r7,
178 struct pt_regs * regs)
179{
180 return do_sigaltstack(uss, uoss, REF_REG_SP);
181}
182
1da177e4
LT		 183/*
184 * Do a signal return; undo the signal stack.
185 */
94e2fb3d 186struct sigframe {
1da177e4
LT		 187 struct sigcontext sc;
188 unsigned long extramask[_NSIG_WORDS-1];
189 long long retcode[2];
190};
191
94e2fb3d 192struct rt_sigframe {
1da177e4
LT		 193 struct siginfo __user *pinfo;
194 void *puc;
195 struct siginfo info;
196 struct ucontext uc;
197 long long retcode[2];
198};
199
200#ifdef CONFIG_SH_FPU
201static inline int
202restore_sigcontext_fpu(struct pt_regs *regs, struct sigcontext __user *sc)
203{
204 int err = 0;
205 int fpvalid;
206
207 err |= __get_user (fpvalid, &sc->sc_fpvalid);
208 conditional_used_math(fpvalid);
209 if (! fpvalid)
210 return err;
211
212 if (current == last_task_used_math) {
213 last_task_used_math = NULL;
214 regs->sr |= SR_FD;
215 }
216
3ef2932b 217 err |= __copy_from_user(&current->thread.xstate->hardfpu, &sc->sc_fpregs[0],
1da177e4
LT		 218 (sizeof(long long) * 32) + (sizeof(int) * 1));
219
220 return err;
221}
222
223static inline int
224setup_sigcontext_fpu(struct pt_regs *regs, struct sigcontext __user *sc)
225{
226 int err = 0;
227 int fpvalid;
228
229 fpvalid = !!used_math();
230 err |= __put_user(fpvalid, &sc->sc_fpvalid);
231 if (! fpvalid)
232 return err;
233
234 if (current == last_task_used_math) {
600ee240 235 enable_fpu();
61cc7b0a 236 save_fpu(current);
600ee240 237 disable_fpu();
1da177e4
LT		 238 last_task_used_math = NULL;
239 regs->sr |= SR_FD;
240 }
241
3ef2932b 242 err |= __copy_to_user(&sc->sc_fpregs[0], &current->thread.xstate->hardfpu,
1da177e4
LT		 243 (sizeof(long long) * 32) + (sizeof(int) * 1));
244 clear_used_math();
245
246 return err;
247}
248#else
249static inline int
250restore_sigcontext_fpu(struct pt_regs *regs, struct sigcontext __user *sc)
f7a7b153
PM		 251{
252 return 0;
253}
1da177e4
LT		 254static inline int
255setup_sigcontext_fpu(struct pt_regs *regs, struct sigcontext __user *sc)
f7a7b153
PM		 256{
257 return 0;
258}
1da177e4
LT		 259#endif
260
261static int
262restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, long long *r2_p)
263{
264 unsigned int err = 0;
265 unsigned long long current_sr, new_sr;
266#define SR_MASK 0xffff8cfd
267
268#define COPY(x) err |= __get_user(regs->x, &sc->sc_##x)
269
270 COPY(regs[0]); COPY(regs[1]); COPY(regs[2]); COPY(regs[3]);
271 COPY(regs[4]); COPY(regs[5]); COPY(regs[6]); COPY(regs[7]);
272 COPY(regs[8]); COPY(regs[9]); COPY(regs[10]); COPY(regs[11]);
273 COPY(regs[12]); COPY(regs[13]); COPY(regs[14]); COPY(regs[15]);
274 COPY(regs[16]); COPY(regs[17]); COPY(regs[18]); COPY(regs[19]);
275 COPY(regs[20]); COPY(regs[21]); COPY(regs[22]); COPY(regs[23]);
276 COPY(regs[24]); COPY(regs[25]); COPY(regs[26]); COPY(regs[27]);
277 COPY(regs[28]); COPY(regs[29]); COPY(regs[30]); COPY(regs[31]);
278 COPY(regs[32]); COPY(regs[33]); COPY(regs[34]); COPY(regs[35]);
279 COPY(regs[36]); COPY(regs[37]); COPY(regs[38]); COPY(regs[39]);
280 COPY(regs[40]); COPY(regs[41]); COPY(regs[42]); COPY(regs[43]);
281 COPY(regs[44]); COPY(regs[45]); COPY(regs[46]); COPY(regs[47]);
282 COPY(regs[48]); COPY(regs[49]); COPY(regs[50]); COPY(regs[51]);
283 COPY(regs[52]); COPY(regs[53]); COPY(regs[54]); COPY(regs[55]);
284 COPY(regs[56]); COPY(regs[57]); COPY(regs[58]); COPY(regs[59]);
285 COPY(regs[60]); COPY(regs[61]); COPY(regs[62]);
286 COPY(tregs[0]); COPY(tregs[1]); COPY(tregs[2]); COPY(tregs[3]);
287 COPY(tregs[4]); COPY(tregs[5]); COPY(tregs[6]); COPY(tregs[7]);
288
289 /* Prevent the signal handler manipulating SR in a way that can
290 crash the kernel. i.e. only allow S, Q, M, PR, SZ, FR to be
291 modified */
292 current_sr = regs->sr;
293 err |= __get_user(new_sr, &sc->sc_sr);
294 regs->sr &= SR_MASK;
295 regs->sr |= (new_sr & ~SR_MASK);
296
297 COPY(pc);
298
299#undef COPY
300
301 /* Must do this last in case it sets regs->sr.fd (i.e. after rest of sr
302 * has been restored above.) */
303 err |= restore_sigcontext_fpu(regs, sc);
304
305 regs->syscall_nr = -1; /* disable syscall checks */
306 err |= __get_user(*r2_p, &sc->sc_regs[REG_RET]);
307 return err;
308}
309
310asmlinkage int sys_sigreturn(unsigned long r2, unsigned long r3,
311 unsigned long r4, unsigned long r5,
312 unsigned long r6, unsigned long r7,
313 struct pt_regs * regs)
314{
315 struct sigframe __user *frame = (struct sigframe __user *) (long) REF_REG_SP;
316 sigset_t set;
317 long long ret;
318
1bec157a
PM		 319 /* Always make any pending restarted system calls return -EINTR */
320 current_thread_info()->restart_block.fn = do_no_restart_syscall;
321
1da177e4
LT		 322 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
323 goto badframe;
324
325 if (__get_user(set.sig[0], &frame->sc.oldmask)
326 || (_NSIG_WORDS > 1
327 && __copy_from_user(&set.sig[1], &frame->extramask,
328 sizeof(frame->extramask))))
329 goto badframe;
330
5e047fa1 331 set_current_blocked(&set);
1da177e4
LT		 332
333 if (restore_sigcontext(regs, &frame->sc, &ret))
334 goto badframe;
335 regs->pc -= 4;
336
337 return (int) ret;
338
339badframe:
340 force_sig(SIGSEGV, current);
341 return 0;
342}
343
344asmlinkage int sys_rt_sigreturn(unsigned long r2, unsigned long r3,
345 unsigned long r4, unsigned long r5,
346 unsigned long r6, unsigned long r7,
347 struct pt_regs * regs)
348{
349 struct rt_sigframe __user *frame = (struct rt_sigframe __user *) (long) REF_REG_SP;
350 sigset_t set;
351 stack_t __user st;
352 long long ret;
353
1bec157a
PM		 354 /* Always make any pending restarted system calls return -EINTR */
355 current_thread_info()->restart_block.fn = do_no_restart_syscall;
356
1da177e4
LT		 357 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
358 goto badframe;
359
360 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
361 goto badframe;
362
5e047fa1 363 set_current_blocked(&set);
1da177e4
LT		 364
365 if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &ret))
366 goto badframe;
367 regs->pc -= 4;
368
369 if (__copy_from_user(&st, &frame->uc.uc_stack, sizeof(st)))
370 goto badframe;
371 /* It is more difficult to avoid calling this function than to
372 call it and ignore errors. */
373 do_sigaltstack(&st, NULL, REF_REG_SP);
374
375 return (int) ret;
376
377badframe:
378 force_sig(SIGSEGV, current);
379 return 0;
380}
381
382/*
383 * Set up a signal frame.
384 */
1da177e4
LT		 385static int
386setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
387 unsigned long mask)
388{
389 int err = 0;
390
391 /* Do this first, otherwise is this sets sr->fd, that value isn't preserved. */
392 err |= setup_sigcontext_fpu(regs, sc);
393
394#define COPY(x) err |= __put_user(regs->x, &sc->sc_##x)
395
396 COPY(regs[0]); COPY(regs[1]); COPY(regs[2]); COPY(regs[3]);
397 COPY(regs[4]); COPY(regs[5]); COPY(regs[6]); COPY(regs[7]);
398 COPY(regs[8]); COPY(regs[9]); COPY(regs[10]); COPY(regs[11]);
399 COPY(regs[12]); COPY(regs[13]); COPY(regs[14]); COPY(regs[15]);
400 COPY(regs[16]); COPY(regs[17]); COPY(regs[18]); COPY(regs[19]);
401 COPY(regs[20]); COPY(regs[21]); COPY(regs[22]); COPY(regs[23]);
402 COPY(regs[24]); COPY(regs[25]); COPY(regs[26]); COPY(regs[27]);
403 COPY(regs[28]); COPY(regs[29]); COPY(regs[30]); COPY(regs[31]);
404 COPY(regs[32]); COPY(regs[33]); COPY(regs[34]); COPY(regs[35]);
405 COPY(regs[36]); COPY(regs[37]); COPY(regs[38]); COPY(regs[39]);
406 COPY(regs[40]); COPY(regs[41]); COPY(regs[42]); COPY(regs[43]);
407 COPY(regs[44]); COPY(regs[45]); COPY(regs[46]); COPY(regs[47]);
408 COPY(regs[48]); COPY(regs[49]); COPY(regs[50]); COPY(regs[51]);
409 COPY(regs[52]); COPY(regs[53]); COPY(regs[54]); COPY(regs[55]);
410 COPY(regs[56]); COPY(regs[57]); COPY(regs[58]); COPY(regs[59]);
411 COPY(regs[60]); COPY(regs[61]); COPY(regs[62]);
412 COPY(tregs[0]); COPY(tregs[1]); COPY(tregs[2]); COPY(tregs[3]);
413 COPY(tregs[4]); COPY(tregs[5]); COPY(tregs[6]); COPY(tregs[7]);
414 COPY(sr); COPY(pc);
415
416#undef COPY
417
418 err |= __put_user(mask, &sc->oldmask);
419
420 return err;
421}
422
423/*
424 * Determine which stack to use..
425 */
426static inline void __user *
427get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size)
428{
d09042da 429 if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && ! sas_ss_flags(sp))
1da177e4
LT		 430 sp = current->sas_ss_sp + current->sas_ss_size;
431
432 return (void __user *)((sp - frame_size) & -8ul);
433}
434
435void sa_default_restorer(void); /* See comments below */
436void sa_default_rt_restorer(void); /* See comments below */
437
6ac03437
PM		 438static int setup_frame(int sig, struct k_sigaction *ka,
439 sigset_t *set, struct pt_regs *regs)
1da177e4
LT		 440{
441 struct sigframe __user *frame;
442 int err = 0;
443 int signal;
444
445 frame = get_sigframe(ka, regs->regs[REG_SP], sizeof(*frame));
446
447 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
448 goto give_sigsegv;
449
450 signal = current_thread_info()->exec_domain
451 && current_thread_info()->exec_domain->signal_invmap
452 && sig < 32
453 ? current_thread_info()->exec_domain->signal_invmap[sig]
454 : sig;
455
456 err |= setup_sigcontext(&frame->sc, regs, set->sig[0]);
457
458 /* Give up earlier as i386, in case */
459 if (err)
460 goto give_sigsegv;
461
462 if (_NSIG_WORDS > 1) {
463 err |= __copy_to_user(frame->extramask, &set->sig[1],
464 sizeof(frame->extramask)); }
465
466 /* Give up earlier as i386, in case */
467 if (err)
468 goto give_sigsegv;
469
470 /* Set up to return from userspace. If provided, use a stub
471 already in userspace. */
472 if (ka->sa.sa_flags & SA_RESTORER) {
1da177e4
LT		 473 /*
474 * On SH5 all edited pointers are subject to NEFF
475 */
c7914834
PM		 476 DEREF_REG_PR = neff_sign_extend((unsigned long)
477 ka->sa.sa_restorer | 0x1);
1da177e4
LT		 478 } else {
479 /*
480 * Different approach on SH5.
481 * . Endianness independent asm code gets placed in entry.S .
482 * This is limited to four ASM instructions corresponding
483 * to two long longs in size.
484 * . err checking is done on the else branch only
485 * . flush_icache_range() is called upon __put_user() only
486 * . all edited pointers are subject to NEFF
487 * . being code, linker turns ShMedia bit on, always
488 * dereference index -1.
489 */
c7914834
PM		 490 DEREF_REG_PR = neff_sign_extend((unsigned long)
491 frame->retcode | 0x01);
1da177e4
LT		 492
493 if (__copy_to_user(frame->retcode,
091db045 494 (void *)((unsigned long)sa_default_restorer & (~1)), 16) != 0)
1da177e4
LT		 495 goto give_sigsegv;
496
497 /* Cohere the trampoline with the I-cache. */
b613881e 498 flush_cache_sigtramp(DEREF_REG_PR-1);
1da177e4
LT		 499 }
500
501 /*
502 * Set up registers for signal handler.
503 * All edited pointers are subject to NEFF.
504 */
c7914834 505 regs->regs[REG_SP] = neff_sign_extend((unsigned long)frame);
1da177e4
LT		 506 regs->regs[REG_ARG1] = signal; /* Arg for signal handler */
507
508 /* FIXME:
509 The glibc profiling support for SH-5 needs to be passed a sigcontext
510 so it can retrieve the PC. At some point during 2003 the glibc
511 support was changed to receive the sigcontext through the 2nd
512 argument, but there are still versions of libc.so in use that use
513 the 3rd argument. Until libc.so is stabilised, pass the sigcontext
514 through both 2nd and 3rd arguments.
515 */
516
517 regs->regs[REG_ARG2] = (unsigned long long)(unsigned long)(signed long)&frame->sc;
518 regs->regs[REG_ARG3] = (unsigned long long)(unsigned long)(signed long)&frame->sc;
519
c7914834 520 regs->pc = neff_sign_extend((unsigned long)ka->sa.sa_handler);
1da177e4
LT		 521
522 set_fs(USER_DS);
523
1da177e4 524 /* Broken %016Lx */
6ac03437
PM		 525 pr_debug("SIG deliver (#%d,%s:%d): sp=%p pc=%08Lx%08Lx link=%08Lx%08Lx\n",
526 signal, current->comm, current->pid, frame,
527 regs->pc >> 32, regs->pc & 0xffffffff,
528 DEREF_REG_PR >> 32, DEREF_REG_PR & 0xffffffff);
1da177e4 529
6ac03437 530 return 0;
1da177e4
LT		 531
532give_sigsegv:
533 force_sigsegv(sig, current);
6ac03437 534 return -EFAULT;
1da177e4
LT		 535}
536
6ac03437
PM		 537static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
538 sigset_t *set, struct pt_regs *regs)
1da177e4
LT		 539{
540 struct rt_sigframe __user *frame;
541 int err = 0;
542 int signal;
543
544 frame = get_sigframe(ka, regs->regs[REG_SP], sizeof(*frame));
545
546 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
547 goto give_sigsegv;
548
549 signal = current_thread_info()->exec_domain
550 && current_thread_info()->exec_domain->signal_invmap
551 && sig < 32
552 ? current_thread_info()->exec_domain->signal_invmap[sig]
553 : sig;
554
555 err |= __put_user(&frame->info, &frame->pinfo);
556 err |= __put_user(&frame->uc, &frame->puc);
557 err |= copy_siginfo_to_user(&frame->info, info);
558
559 /* Give up earlier as i386, in case */
560 if (err)
561 goto give_sigsegv;
562
563 /* Create the ucontext. */
564 err |= __put_user(0, &frame->uc.uc_flags);
565 err |= __put_user(0, &frame->uc.uc_link);
566 err |= __put_user((void *)current->sas_ss_sp,
567 &frame->uc.uc_stack.ss_sp);
568 err |= __put_user(sas_ss_flags(regs->regs[REG_SP]),
569 &frame->uc.uc_stack.ss_flags);
570 err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
571 err |= setup_sigcontext(&frame->uc.uc_mcontext,
572 regs, set->sig[0]);
573 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
574
575 /* Give up earlier as i386, in case */
576 if (err)
577 goto give_sigsegv;
578
579 /* Set up to return from userspace. If provided, use a stub
580 already in userspace. */
581 if (ka->sa.sa_flags & SA_RESTORER) {
1da177e4
LT		 582 /*
583 * On SH5 all edited pointers are subject to NEFF
584 */
c7914834
PM		 585 DEREF_REG_PR = neff_sign_extend((unsigned long)
586 ka->sa.sa_restorer | 0x1);
1da177e4
LT		 587 } else {
588 /*
589 * Different approach on SH5.
590 * . Endianness independent asm code gets placed in entry.S .
591 * This is limited to four ASM instructions corresponding
592 * to two long longs in size.
593 * . err checking is done on the else branch only
594 * . flush_icache_range() is called upon __put_user() only
595 * . all edited pointers are subject to NEFF
596 * . being code, linker turns ShMedia bit on, always
597 * dereference index -1.
598 */
c7914834
PM		 599 DEREF_REG_PR = neff_sign_extend((unsigned long)
600 frame->retcode | 0x01);
1da177e4
LT		 601
602 if (__copy_to_user(frame->retcode,
091db045 603 (void *)((unsigned long)sa_default_rt_restorer & (~1)), 16) != 0)
1da177e4
LT		 604 goto give_sigsegv;
605
c7914834 606 /* Cohere the trampoline with the I-cache. */
1da177e4
LT		 607 flush_icache_range(DEREF_REG_PR-1, DEREF_REG_PR-1+15);
608 }
609
610 /*
611 * Set up registers for signal handler.
612 * All edited pointers are subject to NEFF.
613 */
c7914834 614 regs->regs[REG_SP] = neff_sign_extend((unsigned long)frame);
1da177e4
LT		 615 regs->regs[REG_ARG1] = signal; /* Arg for signal handler */
616 regs->regs[REG_ARG2] = (unsigned long long)(unsigned long)(signed long)&frame->info;
617 regs->regs[REG_ARG3] = (unsigned long long)(unsigned long)(signed long)&frame->uc.uc_mcontext;
c7914834 618 regs->pc = neff_sign_extend((unsigned long)ka->sa.sa_handler);
1da177e4
LT		 619
620 set_fs(USER_DS);
621
6ac03437
PM		 622 pr_debug("SIG deliver (#%d,%s:%d): sp=%p pc=%08Lx%08Lx link=%08Lx%08Lx\n",
623 signal, current->comm, current->pid, frame,
624 regs->pc >> 32, regs->pc & 0xffffffff,
625 DEREF_REG_PR >> 32, DEREF_REG_PR & 0xffffffff);
1da177e4 626
6ac03437 627 return 0;
1da177e4
LT		 628
629give_sigsegv:
630 force_sigsegv(sig, current);
6ac03437 631 return -EFAULT;
1da177e4
LT		 632}
633
634/*
635 * OK, we're invoking a handler
636 */
a610d6e6 637static void
1da177e4 638handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
b7f9a11a 639 struct pt_regs * regs)
1da177e4 640{
b7f9a11a 641 sigset_t *oldset = sigmask_to_save();
6ac03437
PM		 642 int ret;
643
1da177e4
LT		 644 /* Set up the stack frame */
645 if (ka->sa.sa_flags & SA_SIGINFO)
6ac03437 646 ret = setup_rt_frame(sig, ka, info, oldset, regs);
1da177e4 647 else
6ac03437
PM		 648 ret = setup_frame(sig, ka, oldset, regs);
649
a610d6e6
AV		 650 if (ret)
651 return;
1da177e4 652
a610d6e6
AV		 653 block_sigmask(ka, sig);
654 tracehook_signal_handler(sig, info, ka, regs,
655 test_thread_flag(TIF_SINGLESTEP));
1da177e4
LT		 656}
657
ab99c733 658asmlinkage void do_notify_resume(struct pt_regs *regs, unsigned long thread_info_flags)
1da177e4 659{
ab99c733 660 if (thread_info_flags & _TIF_SIGPENDING)
9ef461ad 661 do_signal(regs);
c18fe9a0 662
ab99c733
PM		 663 if (thread_info_flags & _TIF_NOTIFY_RESUME) {
664 clear_thread_flag(TIF_NOTIFY_RESUME);
665 tracehook_notify_resume(regs);
1da177e4 666 }
1da177e4 667}
kernel source for telekom puls (alcatel/mediatek)