blob: 5a9f1f10ebf4b359f573a35f3e70ea34b88fc388 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Paul Mundta23ba432007-11-28 20:19:38 +09002 * arch/sh/kernel/signal_64.c
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 *
4 * Copyright (C) 2000, 2001 Paolo Alberelli
Paul Mundt6ac03432008-12-10 19:26:44 +09005 * Copyright (C) 2003 - 2008 Paul Mundt
Linus Torvalds1da177e2005-04-16 15:20:36 -07006 * Copyright (C) 2004 Richard Curnow
7 *
Paul Mundta23ba432007-11-28 20:19:38 +09008 * 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.
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 */
12#include <linux/rwsem.h>
13#include <linux/sched.h>
14#include <linux/mm.h>
15#include <linux/smp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <linux/kernel.h>
17#include <linux/signal.h>
18#include <linux/errno.h>
19#include <linux/wait.h>
20#include <linux/personality.h>
Nigel Cunningham7dfb7102006-12-06 20:34:23 -080021#include <linux/freezer.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <linux/ptrace.h>
23#include <linux/unistd.h>
24#include <linux/stddef.h>
Paul Mundtab99c732008-07-30 19:55:30 +090025#include <linux/tracehook.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#include <asm/ucontext.h>
27#include <asm/uaccess.h>
28#include <asm/pgtable.h>
Paul Mundtf7a7b152007-11-10 20:07:57 +090029#include <asm/cacheflush.h>
Adrian Bunk50387b32008-04-13 21:15:38 +030030#include <asm/fpu.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031
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
Paul Mundt6ac03432008-12-10 19:26:44 +090046static int
Paul Mundt8a80a5e2008-09-17 23:14:36 +090047handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
48 sigset_t *oldset, struct pt_regs * regs);
49
Paul Mundt94e2fb32008-12-10 19:46:18 +090050static 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;
Paul Mundt94e2fb32008-12-10 19:46:18 +090063 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
Paul Mundtab99c732008-07-30 19:55:30 +090077/*
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
Paul Mundt56bfc422009-10-14 16:05:42 +0900104 if (current_thread_info()->status & TS_RESTORE_SIGMASK)
Paul Mundtab99c732008-07-30 19:55:30 +0900105 oldset = &current->saved_sigmask;
106 else if (!oldset)
107 oldset = &current->blocked;
108
109 signr = get_signal_to_deliver(&info, &ka, regs, 0);
Paul Mundtab99c732008-07-30 19:55:30 +0900110 if (signr > 0) {
Paul Mundt03f07872009-01-29 11:21:38 +0900111 handle_syscall_restart(regs, &ka.sa);
Paul Mundt94e2fb32008-12-10 19:46:18 +0900112
Paul Mundtab99c732008-07-30 19:55:30 +0900113 /* Whee! Actually deliver the signal. */
Paul Mundt6ac03432008-12-10 19:26:44 +0900114 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
Paul Mundt56bfc422009-10-14 16:05:42 +0900118 * clear the TS_RESTORE_SIGMASK flag.
Paul Mundt6ac03432008-12-10 19:26:44 +0900119 */
Paul Mundt56bfc422009-10-14 16:05:42 +0900120 current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
Paul Mundt4b505db2010-02-15 14:17:45 +0900121
122 tracehook_signal_handler(signr, &info, &ka, regs,
123 test_thread_flag(TIF_SINGLESTEP));
Paul Mundt6ac03432008-12-10 19:26:44 +0900124 return 1;
125 }
Paul Mundtab99c732008-07-30 19:55:30 +0900126 }
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 */
Paul Mundt56bfc422009-10-14 16:05:42 +0900149 if (current_thread_info()->status & TS_RESTORE_SIGMASK) {
150 current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
Paul Mundtab99c732008-07-30 19:55:30 +0900151 sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
152 }
153
154 return 0;
155}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156
157/*
158 * Atomically swap in the new signal mask, and wait for a signal.
159 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160asmlinkage 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();
Paul Mundt56bfc422009-10-14 16:05:42 +0900179 set_restore_sigmask();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266/*
267 * Do a signal return; undo the signal stack.
268 */
Paul Mundt94e2fb32008-12-10 19:46:18 +0900269struct sigframe {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 struct sigcontext sc;
271 unsigned long extramask[_NSIG_WORDS-1];
272 long long retcode[2];
273};
274
Paul Mundt94e2fb32008-12-10 19:46:18 +0900275struct rt_sigframe {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276 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
Paul Mundt3ef29322010-01-19 15:40:03 +0900300 err |= __copy_from_user(&current->thread.xstate->hardfpu, &sc->sc_fpregs[0],
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301 (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) {
Paul Mundt600ee242007-11-19 19:13:38 +0900318 enable_fpu();
Matt Fleming61cc7b02009-12-14 20:12:04 +0000319 save_fpu(current);
Paul Mundt600ee242007-11-19 19:13:38 +0900320 disable_fpu();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 last_task_used_math = NULL;
322 regs->sr |= SR_FD;
323 }
324
Paul Mundt3ef29322010-01-19 15:40:03 +0900325 err |= __copy_to_user(&sc->sc_fpregs[0], &current->thread.xstate->hardfpu,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 (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)
Paul Mundtf7a7b152007-11-10 20:07:57 +0900334{
335 return 0;
336}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337static inline int
338setup_sigcontext_fpu(struct pt_regs *regs, struct sigcontext __user *sc)
Paul Mundtf7a7b152007-11-10 20:07:57 +0900339{
340 return 0;
341}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342#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
Paul Mundt1bec1572008-09-24 14:37:35 +0900402 /* Always make any pending restarted system calls return -EINTR */
403 current_thread_info()->restart_block.fn = do_no_restart_syscall;
404
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405 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
Paul Mundt1bec1572008-09-24 14:37:35 +0900442 /* Always make any pending restarted system calls return -EINTR */
443 current_thread_info()->restart_block.fn = do_no_restart_syscall;
444
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445 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 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477static 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{
Laurent MEYERd09042d2006-06-23 02:05:36 -0700521 if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && ! sas_ss_flags(sp))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522 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
Paul Mundt6ac03432008-12-10 19:26:44 +0900530static int setup_frame(int sig, struct k_sigaction *ka,
531 sigset_t *set, struct pt_regs *regs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532{
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) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 /*
566 * On SH5 all edited pointers are subject to NEFF
567 */
Paul Mundtc7914832009-08-04 17:14:39 +0900568 DEREF_REG_PR = neff_sign_extend((unsigned long)
569 ka->sa.sa_restorer | 0x1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570 } 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 */
Paul Mundtc7914832009-08-04 17:14:39 +0900582 DEREF_REG_PR = neff_sign_extend((unsigned long)
583 frame->retcode | 0x01);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584
585 if (__copy_to_user(frame->retcode,
Paul Mundt091db042008-09-29 19:44:40 +0900586 (void *)((unsigned long)sa_default_restorer & (~1)), 16) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587 goto give_sigsegv;
588
589 /* Cohere the trampoline with the I-cache. */
Paul Mundtb6138812007-11-11 15:53:51 +0900590 flush_cache_sigtramp(DEREF_REG_PR-1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591 }
592
593 /*
594 * Set up registers for signal handler.
595 * All edited pointers are subject to NEFF.
596 */
Paul Mundtc7914832009-08-04 17:14:39 +0900597 regs->regs[REG_SP] = neff_sign_extend((unsigned long)frame);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598 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
Paul Mundtc7914832009-08-04 17:14:39 +0900612 regs->pc = neff_sign_extend((unsigned long)ka->sa.sa_handler);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613
614 set_fs(USER_DS);
615
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616 /* Broken %016Lx */
Paul Mundt6ac03432008-12-10 19:26:44 +0900617 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621
Paul Mundt6ac03432008-12-10 19:26:44 +0900622 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623
624give_sigsegv:
625 force_sigsegv(sig, current);
Paul Mundt6ac03432008-12-10 19:26:44 +0900626 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627}
628
Paul Mundt6ac03432008-12-10 19:26:44 +0900629static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
630 sigset_t *set, struct pt_regs *regs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631{
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) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674 /*
675 * On SH5 all edited pointers are subject to NEFF
676 */
Paul Mundtc7914832009-08-04 17:14:39 +0900677 DEREF_REG_PR = neff_sign_extend((unsigned long)
678 ka->sa.sa_restorer | 0x1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679 } 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 */
Paul Mundtc7914832009-08-04 17:14:39 +0900691 DEREF_REG_PR = neff_sign_extend((unsigned long)
692 frame->retcode | 0x01);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693
694 if (__copy_to_user(frame->retcode,
Paul Mundt091db042008-09-29 19:44:40 +0900695 (void *)((unsigned long)sa_default_rt_restorer & (~1)), 16) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696 goto give_sigsegv;
697
Paul Mundtc7914832009-08-04 17:14:39 +0900698 /* Cohere the trampoline with the I-cache. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699 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 */
Paul Mundtc7914832009-08-04 17:14:39 +0900706 regs->regs[REG_SP] = neff_sign_extend((unsigned long)frame);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707 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;
Paul Mundtc7914832009-08-04 17:14:39 +0900710 regs->pc = neff_sign_extend((unsigned long)ka->sa.sa_handler);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711
712 set_fs(USER_DS);
713
Paul Mundt6ac03432008-12-10 19:26:44 +0900714 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718
Paul Mundt6ac03432008-12-10 19:26:44 +0900719 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720
721give_sigsegv:
722 force_sigsegv(sig, current);
Paul Mundt6ac03432008-12-10 19:26:44 +0900723 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724}
725
726/*
727 * OK, we're invoking a handler
728 */
Paul Mundt6ac03432008-12-10 19:26:44 +0900729static int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
731 sigset_t *oldset, struct pt_regs * regs)
732{
Paul Mundt6ac03432008-12-10 19:26:44 +0900733 int ret;
734
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735 /* Set up the stack frame */
736 if (ka->sa.sa_flags & SA_SIGINFO)
Paul Mundt6ac03432008-12-10 19:26:44 +0900737 ret = setup_rt_frame(sig, ka, info, oldset, regs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738 else
Paul Mundt6ac03432008-12-10 19:26:44 +0900739 ret = setup_frame(sig, ka, oldset, regs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740
Paul Mundt6ac03432008-12-10 19:26:44 +0900741 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 }
752
753 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754}
755
Paul Mundtab99c732008-07-30 19:55:30 +0900756asmlinkage void do_notify_resume(struct pt_regs *regs, unsigned long thread_info_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757{
Paul Mundtab99c732008-07-30 19:55:30 +0900758 if (thread_info_flags & _TIF_SIGPENDING)
759 do_signal(regs, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760
Paul Mundtab99c732008-07-30 19:55:30 +0900761 if (thread_info_flags & _TIF_NOTIFY_RESUME) {
762 clear_thread_flag(TIF_NOTIFY_RESUME);
763 tracehook_notify_resume(regs);
David Howellsee18d642009-09-02 09:14:21 +0100764 if (current->replacement_session_keyring)
765 key_replace_session_keyring();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767}