]> bbs.cooldavid.org Git - net-next-2.6.git/blame - arch/sh/kernel/signal_64.c
git://bbs.cooldavid.org / net-next-2.6.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Merge branch 'ebt_config_compat_v4' of git://git.breakpoint.cc/fw/nf-next-2.6
[net-next-2.6.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
44#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
45
6ac03437 46static int
8a80a5e9
PM		 47handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
48 sigset_t *oldset, struct pt_regs * regs);
49
94e2fb3d
PM		 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;
94e2fb3d
PM		 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
ab99c733
PM		 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
56bfc42f 104 if (current_thread_info()->status & TS_RESTORE_SIGMASK)
ab99c733
PM		 105 oldset = &current->saved_sigmask;
106 else if (!oldset)
107 oldset = &current->blocked;
108
109 signr = get_signal_to_deliver(&info, &ka, regs, 0);
ab99c733 110 if (signr > 0) {
03f07876 111 handle_syscall_restart(regs, &ka.sa);
94e2fb3d 112
ab99c733 113 /* Whee! Actually deliver the signal. */
6ac03437
PM		 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
56bfc42f 118 * clear the TS_RESTORE_SIGMASK flag.
6ac03437 119 */
56bfc42f 120 current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
4b505db9
PM		 121
122 tracehook_signal_handler(signr, &info, &ka, regs,
123 test_thread_flag(TIF_SINGLESTEP));
6ac03437
PM		 124 return 1;
125 }
ab99c733
PM		 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 */
56bfc42f
PM		 149 if (current_thread_info()->status & TS_RESTORE_SIGMASK) {
150 current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
ab99c733
PM		 151 sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
152 }
153
154 return 0;
155}
1da177e4
LT		 156
157/*
158 * Atomically swap in the new signal mask, and wait for a signal.
159 */
1da177e4
LT		 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(&current->sighand->siglock);
170 saveset = current->blocked;
171 siginitset(&current->blocked, mask);
172 recalc_sigpending();
173 spin_unlock_irq(&current->sighand->siglock);
174
175 REF_REG_RET = -EINTR;
176 while (1) {
177 current->state = TASK_INTERRUPTIBLE;
178 schedule();
56bfc42f 179 set_restore_sigmask();
1da177e4
LT		 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(&current->sighand->siglock);
206 saveset = current->blocked;
207 current->blocked = newset;
208 recalc_sigpending();
209 spin_unlock_irq(&current->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
1da177e4
LT		 266/*
267 * Do a signal return; undo the signal stack.
268 */
94e2fb3d 269struct sigframe {
1da177e4
LT		 270 struct sigcontext sc;
271 unsigned long extramask[_NSIG_WORDS-1];
272 long long retcode[2];
273};
274
94e2fb3d 275struct rt_sigframe {
1da177e4
LT		 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(&current->thread.fpu.hard, &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) {
600ee240 318 enable_fpu();
61cc7b0a 319 save_fpu(current);
600ee240 320 disable_fpu();
1da177e4
LT		 321 last_task_used_math = NULL;
322 regs->sr |= SR_FD;
323 }
324
325 err |= __copy_to_user(&sc->sc_fpregs[0], &current->thread.fpu.hard,
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)
f7a7b153
PM		 334{
335 return 0;
336}
1da177e4
LT		 337static inline int
338setup_sigcontext_fpu(struct pt_regs *regs, struct sigcontext __user *sc)
f7a7b153
PM		 339{
340 return 0;
341}
1da177e4
LT		 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
1bec157a
PM		 402 /* Always make any pending restarted system calls return -EINTR */
403 current_thread_info()->restart_block.fn = do_no_restart_syscall;
404
1da177e4
LT		 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(&current->sighand->siglock);
417 current->blocked = set;
418 recalc_sigpending();
419 spin_unlock_irq(&current->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
1bec157a
PM		 442 /* Always make any pending restarted system calls return -EINTR */
443 current_thread_info()->restart_block.fn = do_no_restart_syscall;
444
1da177e4
LT		 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(&current->sighand->siglock);
453 current->blocked = set;
454 recalc_sigpending();
455 spin_unlock_irq(&current->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 */
1da177e4
LT		 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{
d09042da 521 if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && ! sas_ss_flags(sp))
1da177e4
LT		 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
6ac03437
PM		 530static int setup_frame(int sig, struct k_sigaction *ka,
531 sigset_t *set, struct pt_regs *regs)
1da177e4
LT		 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) {
1da177e4
LT		 565 /*
566 * On SH5 all edited pointers are subject to NEFF
567 */
c7914834
PM		 568 DEREF_REG_PR = neff_sign_extend((unsigned long)
569 ka->sa.sa_restorer | 0x1);
1da177e4
LT		 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 */
c7914834
PM		 582 DEREF_REG_PR = neff_sign_extend((unsigned long)
583 frame->retcode | 0x01);
1da177e4
LT		 584
585 if (__copy_to_user(frame->retcode,
091db045 586 (void *)((unsigned long)sa_default_restorer & (~1)), 16) != 0)
1da177e4
LT		 587 goto give_sigsegv;
588
589 /* Cohere the trampoline with the I-cache. */
b613881e 590 flush_cache_sigtramp(DEREF_REG_PR-1);
1da177e4
LT		 591 }
592
593 /*
594 * Set up registers for signal handler.
595 * All edited pointers are subject to NEFF.
596 */
c7914834 597 regs->regs[REG_SP] = neff_sign_extend((unsigned long)frame);
1da177e4
LT		 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
c7914834 612 regs->pc = neff_sign_extend((unsigned long)ka->sa.sa_handler);
1da177e4
LT		 613
614 set_fs(USER_DS);
615
1da177e4 616 /* Broken %016Lx */
6ac03437
PM		 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);
1da177e4 621
6ac03437 622 return 0;
1da177e4
LT		 623
624give_sigsegv:
625 force_sigsegv(sig, current);
6ac03437 626 return -EFAULT;
1da177e4
LT		 627}
628
6ac03437
PM		 629static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
630 sigset_t *set, struct pt_regs *regs)
1da177e4
LT		 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) {
1da177e4
LT		 674 /*
675 * On SH5 all edited pointers are subject to NEFF
676 */
c7914834
PM		 677 DEREF_REG_PR = neff_sign_extend((unsigned long)
678 ka->sa.sa_restorer | 0x1);
1da177e4
LT		 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 */
c7914834
PM		 691 DEREF_REG_PR = neff_sign_extend((unsigned long)
692 frame->retcode | 0x01);
1da177e4
LT		 693
694 if (__copy_to_user(frame->retcode,
091db045 695 (void *)((unsigned long)sa_default_rt_restorer & (~1)), 16) != 0)
1da177e4
LT		 696 goto give_sigsegv;
697
c7914834 698 /* Cohere the trampoline with the I-cache. */
1da177e4
LT		 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 */
c7914834 706 regs->regs[REG_SP] = neff_sign_extend((unsigned long)frame);
1da177e4
LT		 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;
c7914834 710 regs->pc = neff_sign_extend((unsigned long)ka->sa.sa_handler);
1da177e4
LT		 711
712 set_fs(USER_DS);
713
6ac03437
PM		 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);
1da177e4 718
6ac03437 719 return 0;
1da177e4
LT		 720
721give_sigsegv:
722 force_sigsegv(sig, current);
6ac03437 723 return -EFAULT;
1da177e4
LT		 724}
725
726/*
727 * OK, we're invoking a handler
728 */
6ac03437 729static int
1da177e4
LT		 730handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
731 sigset_t *oldset, struct pt_regs * regs)
732{
6ac03437
PM		 733 int ret;
734
1da177e4
LT		 735 /* Set up the stack frame */
736 if (ka->sa.sa_flags & SA_SIGINFO)
6ac03437 737 ret = setup_rt_frame(sig, ka, info, oldset, regs);
1da177e4 738 else
6ac03437
PM		 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(&current->sighand->siglock);
746 sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
747 if (!(ka->sa.sa_flags & SA_NODEFER))
748 sigaddset(&current->blocked,sig);
749 recalc_sigpending();
750 spin_unlock_irq(&current->sighand->siglock);
751 }
1da177e4 752
6ac03437 753 return ret;
1da177e4
LT		 754}
755
ab99c733 756asmlinkage void do_notify_resume(struct pt_regs *regs, unsigned long thread_info_flags)
1da177e4 757{
ab99c733
PM		 758 if (thread_info_flags & _TIF_SIGPENDING)
759 do_signal(regs, 0);
c18fe9a0 760
ab99c733
PM		 761 if (thread_info_flags & _TIF_NOTIFY_RESUME) {
762 clear_thread_flag(TIF_NOTIFY_RESUME);
763 tracehook_notify_resume(regs);
ee18d64c
DH		 764 if (current->replacement_session_keyring)
765 key_replace_session_keyring();
1da177e4 766 }
1da177e4 767}
Clone of davem's net-next-2.6 tree