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[openwrt/staging/chunkeey.git] / target / linux / coldfire / files-2.6.31 / arch / m68k / coldfire / common / signal.c
1 /*
2 * linux/arch/m68k/kernel/signal.c
3 *
4 * Copyright 2007-2009 Freescale Semiconductor, Inc. All Rights Reserved.
5 * Matt Waddel Matt.Waddel@freescale.com
6 * Jason Jin Jason.Jin@freescale.com
7 * Shrek Wu B16972@freescale.com
8 *
9 * This file is subject to the terms and conditions of the GNU General Public
10 * License. See the file COPYING in the main directory of this archive
11 * for more details.
12 *
13 * Derived from m68k/kernel/signal.c and the original authors are credited
14 * there.
15 */
16
17 #include <linux/sched.h>
18 #include <linux/mm.h>
19 #include <linux/kernel.h>
20 #include <linux/signal.h>
21 #include <linux/syscalls.h>
22 #include <linux/errno.h>
23 #include <linux/wait.h>
24 #include <linux/ptrace.h>
25 #include <linux/unistd.h>
26 #include <linux/stddef.h>
27 #include <linux/highuid.h>
28 #include <linux/personality.h>
29 #include <linux/tty.h>
30 #include <linux/binfmts.h>
31
32 #include <asm/setup.h>
33 #include <asm/cf_uaccess.h>
34 #include <asm/cf_pgtable.h>
35 #include <asm/traps.h>
36 #include <asm/ucontext.h>
37 #include <asm/cacheflush.h>
38
39 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
40
41 asmlinkage int do_signal(sigset_t *oldset, struct pt_regs *regs);
42
43 const int frame_extra_sizes[16] = {
44 [1] = -1,
45 [2] = sizeof(((struct frame *)0)->un.fmt2),
46 [3] = sizeof(((struct frame *)0)->un.fmt3),
47 [4] = 0,
48 [5] = -1,
49 [6] = -1,
50 [7] = sizeof(((struct frame *)0)->un.fmt7),
51 [8] = -1,
52 [9] = sizeof(((struct frame *)0)->un.fmt9),
53 [10] = sizeof(((struct frame *)0)->un.fmta),
54 [11] = sizeof(((struct frame *)0)->un.fmtb),
55 [12] = -1,
56 [13] = -1,
57 [14] = -1,
58 [15] = -1,
59 };
60
61 /*
62 * Atomically swap in the new signal mask, and wait for a signal.
63 */
64 asmlinkage int do_sigsuspend(struct pt_regs *regs)
65 {
66 old_sigset_t mask = regs->d3;
67 sigset_t saveset;
68
69 mask &= _BLOCKABLE;
70 spin_lock_irq(&current->sighand->siglock);
71 saveset = current->blocked;
72 siginitset(&current->blocked, mask);
73 recalc_sigpending();
74 spin_unlock_irq(&current->sighand->siglock);
75
76 regs->d0 = -EINTR;
77 while (1) {
78 current->state = TASK_INTERRUPTIBLE;
79 schedule();
80 if (do_signal(&saveset, regs))
81 return -EINTR;
82 }
83 }
84
85 asmlinkage int
86 do_rt_sigsuspend(struct pt_regs *regs)
87 {
88 sigset_t __user *unewset = (sigset_t __user *)regs->d1;
89 size_t sigsetsize = (size_t)regs->d2;
90 sigset_t saveset, newset;
91
92 /* XXX: Don't preclude handling different sized sigset_t's. */
93 if (sigsetsize != sizeof(sigset_t))
94 return -EINVAL;
95
96 if (copy_from_user(&newset, unewset, sizeof(newset)))
97 return -EFAULT;
98 sigdelsetmask(&newset, ~_BLOCKABLE);
99
100 spin_lock_irq(&current->sighand->siglock);
101 saveset = current->blocked;
102 current->blocked = newset;
103 recalc_sigpending();
104 spin_unlock_irq(&current->sighand->siglock);
105
106 regs->d0 = -EINTR;
107 while (1) {
108 current->state = TASK_INTERRUPTIBLE;
109 schedule();
110 if (do_signal(&saveset, regs))
111 return -EINTR;
112 }
113 }
114
115 asmlinkage int
116 sys_sigaction(int sig, const struct old_sigaction __user *act,
117 struct old_sigaction __user *oact)
118 {
119 struct k_sigaction new_ka, old_ka;
120 int ret;
121
122 if (act) {
123 old_sigset_t mask;
124 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
125 __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
126 __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
127 return -EFAULT;
128 __get_user(new_ka.sa.sa_flags, &act->sa_flags);
129 __get_user(mask, &act->sa_mask);
130 siginitset(&new_ka.sa.sa_mask, mask);
131 }
132
133 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
134
135 if (!ret && oact) {
136 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
137 __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
138 __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
139 return -EFAULT;
140 __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
141 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
142 }
143
144 return ret;
145 }
146
147 asmlinkage int
148 sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss)
149 {
150 return do_sigaltstack(uss, uoss, rdusp());
151 }
152
153
154 /*
155 * Do a signal return; undo the signal stack.
156 *
157 * Keep the return code on the stack quadword aligned!
158 * That makes the cache flush below easier.
159 */
160
161 struct sigframe
162 {
163 char __user *pretcode;
164 int sig;
165 int code;
166 struct sigcontext __user *psc;
167 char retcode[8];
168 unsigned long extramask[_NSIG_WORDS-1];
169 struct sigcontext sc;
170 };
171
172 struct rt_sigframe
173 {
174 char __user *pretcode;
175 int sig;
176 struct siginfo __user *pinfo;
177 void __user *puc;
178 char retcode[8];
179 struct siginfo info;
180 struct ucontext uc;
181 };
182
183 #define FPCONTEXT_SIZE 216
184 #define uc_fpstate uc_filler[0]
185 #define uc_formatvec uc_filler[FPCONTEXT_SIZE/4]
186 #define uc_extra uc_filler[FPCONTEXT_SIZE/4+1]
187
188 #ifdef CONFIG_FPU
189 static unsigned char fpu_version; /* version num of fpu, set by setup_frame */
190
191 static inline int restore_fpu_state(struct sigcontext *sc)
192 {
193 int err = 1;
194
195 if (FPU_IS_EMU) {
196 /* restore registers */
197 memcpy(current->thread.fpcntl, sc->sc_fpcntl, 12);
198 memcpy(current->thread.fp, sc->sc_fpregs, 24);
199 return 0;
200 }
201
202 if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) {
203 /* Verify the frame format. */
204 if (!CPU_IS_060 && (sc->sc_fpstate[0] != fpu_version))
205 goto out;
206 if (CPU_IS_020_OR_030) {
207 if (m68k_fputype & FPU_68881 &&
208 !(sc->sc_fpstate[1] == 0x18 || sc->sc_fpstate[1] == 0xb4))
209 goto out;
210 if (m68k_fputype & FPU_68882 &&
211 !(sc->sc_fpstate[1] == 0x38 || sc->sc_fpstate[1] == 0xd4))
212 goto out;
213 } else if (CPU_IS_040) {
214 if (!(sc->sc_fpstate[1] == 0x00 ||
215 sc->sc_fpstate[1] == 0x28 ||
216 sc->sc_fpstate[1] == 0x60))
217 goto out;
218 } else if (CPU_IS_060) {
219 if (!(sc->sc_fpstate[3] == 0x00 ||
220 sc->sc_fpstate[3] == 0x60 ||
221 sc->sc_fpstate[3] == 0xe0))
222 goto out;
223 } else if (CPU_IS_CFV4E) {
224 pr_debug("restore v4e fpu state at %s\n", __func__);
225 } else
226 goto out;
227 #ifdef CONFIG_CFV4E
228 __asm__ volatile ("fmovem %0,%/fp0-%/fp1\n\t"
229 QCHIP_RESTORE_DIRECTIVE
230 : /* no outputs */
231 : "m" (sc->sc_fpregs[0][0])
232 : "memory");
233 __asm__ volatile ("fmovel %0,%/fpcr"
234 : : "m" (sc->sc_fpcntl[0])
235 : "memory" );
236 __asm__ volatile ("fmovel %0,%/fpsr"
237 : : "m" (sc->sc_fpcntl[1])
238 : "memory" );
239 __asm__ volatile ("fmovel %0,%/fpiar"
240 : : "m" (sc->sc_fpcntl[2])
241 : "memory" );
242
243 #endif
244 }
245
246 #ifdef CONFIG_CFV4E
247 __asm__ volatile ("frestore %0\n\t"
248 QCHIP_RESTORE_DIRECTIVE : : "m" (*sc->sc_fpstate));
249 #endif
250 err = 0;
251
252 out:
253 return err;
254 }
255
256 static inline int rt_restore_fpu_state(struct ucontext __user *uc)
257 {
258 unsigned char fpstate[FPCONTEXT_SIZE];
259 int context_size = CPU_IS_060 ? 8 : 0;
260 fpregset_t fpregs;
261 int err = 1;
262
263 if (FPU_IS_EMU) {
264 /* restore fpu control register */
265 if (__copy_from_user(current->thread.fpcntl,
266 uc->uc_mcontext.fpregs.f_fpcntl, 12))
267 goto out;
268 /* restore all other fpu register */
269 if (__copy_from_user(current->thread.fp,
270 uc->uc_mcontext.fpregs.f_fpregs, 96))
271 goto out;
272 return 0;
273 }
274
275 if (__get_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate))
276 goto out;
277 if (CPU_IS_060 ? fpstate[2] : fpstate[0]) {
278 if (!CPU_IS_060)
279 context_size = fpstate[1];
280 /* Verify the frame format. */
281 if (!CPU_IS_060 && (fpstate[0] != fpu_version))
282 goto out;
283 if (CPU_IS_020_OR_030) {
284 if (m68k_fputype & FPU_68881 &&
285 !(context_size == 0x18 || context_size == 0xb4))
286 goto out;
287 if (m68k_fputype & FPU_68882 &&
288 !(context_size == 0x38 || context_size == 0xd4))
289 goto out;
290 } else if (CPU_IS_040) {
291 if (!(context_size == 0x00 ||
292 context_size == 0x28 ||
293 context_size == 0x60))
294 goto out;
295 } else if (CPU_IS_060) {
296 if (!(fpstate[3] == 0x00 ||
297 fpstate[3] == 0x60 ||
298 fpstate[3] == 0xe0))
299 goto out;
300 } else if (CPU_IS_CFV4E) {
301 pr_debug("restore coldfire rt v4e fpu"
302 " state at %s\n", __func__);
303 } else
304 goto out;
305 if (__copy_from_user(&fpregs, &uc->uc_mcontext.fpregs,
306 sizeof(fpregs)))
307 goto out;
308 #ifdef CONFIG_CFV4E
309 __asm__ volatile ("fmovem %0,%/fp0-%/fp7\n\t"
310 QCHIP_RESTORE_DIRECTIVE
311 : /* no outputs */
312 : "m" (fpregs.f_fpregs[0][0])
313 : "memory");
314 __asm__ volatile ("fmovel %0,%/fpcr"
315 : : "m" (fpregs.f_fpcntl[0])
316 : "memory" );
317 __asm__ volatile ("fmovel %0,%/fpsr"
318 : : "m" (fpregs.f_fpcntl[1])
319 : "memory" );
320 __asm__ volatile ("fmovel %0,%/fpiar"
321 : : "m" (fpregs.f_fpcntl[2])
322 : "memory" );
323 #endif
324 }
325 if (context_size &&
326 __copy_from_user(fpstate + 4, (long __user *)&uc->uc_fpstate + 1,
327 context_size))
328 goto out;
329 #ifdef CONFIG_CFV4E
330 __asm__ volatile ("frestore %0\n\t"
331 QCHIP_RESTORE_DIRECTIVE : : "m" (*fpstate));
332 #endif
333 err = 0;
334
335 out:
336 return err;
337 }
338 #endif
339
340 static inline int
341 restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *usc,
342 void __user *fp, int *pd0)
343 {
344 int fsize, formatvec;
345 struct sigcontext context;
346 int err = 0;
347
348 /* get previous context */
349 if (copy_from_user(&context, usc, sizeof(context)))
350 goto badframe;
351
352 /* restore passed registers */
353 regs->d1 = context.sc_d1;
354 regs->a0 = context.sc_a0;
355 regs->a1 = context.sc_a1;
356 regs->sr = (regs->sr & 0xff00) | (context.sc_sr & 0xff);
357 regs->pc = context.sc_pc;
358 regs->orig_d0 = -1; /* disable syscall checks */
359 wrusp(context.sc_usp);
360 formatvec = context.sc_formatvec;
361 regs->format = formatvec >> 12;
362 regs->vector = formatvec & 0xfff;
363
364 #ifdef CONFIG_FPU
365 err = restore_fpu_state(&context);
366 #endif
367
368 fsize = frame_extra_sizes[regs->format];
369 if (fsize < 0) {
370 /*
371 * user process trying to return with weird frame format
372 */
373 #ifdef DEBUG
374 printk(KERN_DEBUG "user process returning with weird \
375 frame format\n");
376 #endif
377 goto badframe;
378 }
379
380 /* OK. Make room on the supervisor stack for the extra junk,
381 * if necessary.
382 */
383
384 {
385 struct switch_stack *sw = (struct switch_stack *)regs - 1;
386 regs->d0 = context.sc_d0;
387 #define frame_offset (sizeof(struct pt_regs)+sizeof(struct switch_stack))
388 __asm__ __volatile__
389 (" movel %0,%/sp\n\t"
390 " bra ret_from_signal\n"
391 "4:\n"
392 ".section __ex_table,\"a\"\n"
393 " .align 4\n"
394 " .long 2b,4b\n"
395 ".previous"
396 : /* no outputs, it doesn't ever return */
397 : "a" (sw), "d" (fsize), "d" (frame_offset/4-1),
398 "n" (frame_offset), "a" (fp)
399 : "a0");
400 #undef frame_offset
401 /*
402 * If we ever get here an exception occurred while
403 * building the above stack-frame.
404 */
405 goto badframe;
406 }
407
408 *pd0 = context.sc_d0;
409 return err;
410
411 badframe:
412 return 1;
413 }
414
415 static inline int
416 rt_restore_ucontext(struct pt_regs *regs, struct switch_stack *sw,
417 struct ucontext __user *uc, int *pd0)
418 {
419 int fsize, temp;
420 greg_t __user *gregs = uc->uc_mcontext.gregs;
421 unsigned long usp;
422 int err;
423
424 err = __get_user(temp, &uc->uc_mcontext.version);
425 if (temp != MCONTEXT_VERSION)
426 goto badframe;
427 /* restore passed registers */
428 err |= __get_user(regs->d0, &gregs[0]);
429 err |= __get_user(regs->d1, &gregs[1]);
430 err |= __get_user(regs->d2, &gregs[2]);
431 err |= __get_user(regs->d3, &gregs[3]);
432 err |= __get_user(regs->d4, &gregs[4]);
433 err |= __get_user(regs->d5, &gregs[5]);
434 err |= __get_user(sw->d6, &gregs[6]);
435 err |= __get_user(sw->d7, &gregs[7]);
436 err |= __get_user(regs->a0, &gregs[8]);
437 err |= __get_user(regs->a1, &gregs[9]);
438 err |= __get_user(regs->a2, &gregs[10]);
439 err |= __get_user(sw->a3, &gregs[11]);
440 err |= __get_user(sw->a4, &gregs[12]);
441 err |= __get_user(sw->a5, &gregs[13]);
442 err |= __get_user(sw->a6, &gregs[14]);
443 err |= __get_user(usp, &gregs[15]);
444 wrusp(usp);
445 err |= __get_user(regs->pc, &gregs[16]);
446 err |= __get_user(temp, &gregs[17]);
447 regs->sr = (regs->sr & 0xff00) | (temp & 0xff);
448 regs->orig_d0 = -1; /* disable syscall checks */
449 err |= __get_user(temp, &uc->uc_formatvec);
450 regs->format = temp >> 12;
451 regs->vector = temp & 0xfff;
452
453 #ifdef CONFIG_FPU
454 err |= rt_restore_fpu_state(uc);
455 #endif
456
457 if (do_sigaltstack(&uc->uc_stack, NULL, usp) == -EFAULT)
458 goto badframe;
459
460 fsize = frame_extra_sizes[regs->format];
461 if (fsize < 0) {
462 /*
463 * user process trying to return with weird frame format
464 */
465 #ifdef DEBUG
466 printk(KERN_DEBUG "user process returning with weird \
467 frame format\n");
468 #endif
469 goto badframe;
470 }
471
472 /* OK. Make room on the supervisor stack for the extra junk,
473 * if necessary.
474 */
475
476 {
477 #define frame_offset (sizeof(struct pt_regs)+sizeof(struct switch_stack))
478 __asm__ __volatile__
479 (" movel %0,%/sp\n\t"
480 " bra ret_from_signal\n"
481 "4:\n"
482 ".section __ex_table,\"a\"\n"
483 " .align 4\n"
484 " .long 2b,4b\n"
485 ".previous"
486 : /* no outputs, it doesn't ever return */
487 : "a" (sw), "d" (fsize), "d" (frame_offset/4-1),
488 "n" (frame_offset), "a" (&uc->uc_extra)
489 : "a0");
490 #undef frame_offset
491 /*
492 * If we ever get here an exception occurred while
493 * building the above stack-frame.
494 */
495 goto badframe;
496 }
497
498 *pd0 = regs->d0;
499 return err;
500
501 badframe:
502 return 1;
503 }
504
505 asmlinkage int do_sigreturn(unsigned long __unused)
506 {
507 struct switch_stack *sw = (struct switch_stack *) &__unused;
508 struct pt_regs *regs = (struct pt_regs *) (sw + 1);
509 unsigned long usp = rdusp();
510 struct sigframe __user *frame = (struct sigframe __user *)(usp - 4);
511 sigset_t set;
512 int d0;
513
514 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
515 goto badframe;
516 if (__get_user(set.sig[0], &frame->sc.sc_mask) ||
517 (_NSIG_WORDS > 1 &&
518 __copy_from_user(&set.sig[1], &frame->extramask,
519 sizeof(frame->extramask))))
520 goto badframe;
521
522 sigdelsetmask(&set, ~_BLOCKABLE);
523 spin_lock_irq(&current->sighand->siglock);
524 current->blocked = set;
525 recalc_sigpending();
526 spin_unlock_irq(&current->sighand->siglock);
527
528 if (restore_sigcontext(regs, &frame->sc, frame + 1, &d0))
529 goto badframe;
530 return d0;
531
532 badframe:
533 force_sig(SIGSEGV, current);
534 return 0;
535 }
536
537 asmlinkage int do_rt_sigreturn(unsigned long __unused)
538 {
539 struct switch_stack *sw = (struct switch_stack *) &__unused;
540 struct pt_regs *regs = (struct pt_regs *) (sw + 1);
541 unsigned long usp = rdusp();
542 struct rt_sigframe __user *frame =
543 (struct rt_sigframe __user *)(usp - 4);
544 sigset_t set;
545 int d0;
546
547 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
548 goto badframe;
549 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
550 goto badframe;
551
552 sigdelsetmask(&set, ~_BLOCKABLE);
553 spin_lock_irq(&current->sighand->siglock);
554 current->blocked = set;
555 recalc_sigpending();
556 spin_unlock_irq(&current->sighand->siglock);
557
558 if (rt_restore_ucontext(regs, sw, &frame->uc, &d0))
559 goto badframe;
560 return d0;
561
562 badframe:
563 force_sig(SIGSEGV, current);
564 return 0;
565 }
566
567 #ifdef CONFIG_FPU
568 /*
569 * Set up a signal frame.
570 */
571
572 static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs)
573 {
574 if (FPU_IS_EMU) {
575 /* save registers */
576 memcpy(sc->sc_fpcntl, current->thread.fpcntl, 12);
577 memcpy(sc->sc_fpregs, current->thread.fp, 24);
578 return;
579 }
580
581 #ifdef CONFIG_CFV4E
582 __asm__ volatile ("fsave %0\n\t"
583 QCHIP_RESTORE_DIRECTIVE
584 : : "m" (*sc->sc_fpstate) : "memory");
585 #endif
586
587 if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) {
588 fpu_version = sc->sc_fpstate[0];
589 if (CPU_IS_020_OR_030 &&
590 regs->vector >= (VEC_FPBRUC * 4) &&
591 regs->vector <= (VEC_FPNAN * 4)) {
592 /* Clear pending exception in 68882 idle frame */
593 if (*(unsigned short *) sc->sc_fpstate == 0x1f38)
594 sc->sc_fpstate[0x38] |= 1 << 3;
595 }
596 #ifdef CONFIG_CFV4E
597 __asm__ volatile ("fmovemd %/fp0-%/fp1,%0"
598 : : "m" (sc->sc_fpregs[0][0])
599 : "memory");
600 __asm__ volatile ("fmovel %/fpcr,%0"
601 : : "m" (sc->sc_fpcntl[0])
602 : "memory");
603 __asm__ volatile ("fmovel %/fpsr,%0"
604 : : "m" (sc->sc_fpcntl[1])
605 : "memory");
606 __asm__ volatile ("fmovel %/fpiar,%0"
607 : : "m" (sc->sc_fpcntl[2])
608 : "memory");
609
610 #endif
611 }
612 }
613
614 static inline int rt_save_fpu_state(struct ucontext __user *uc,
615 struct pt_regs *regs)
616 {
617 unsigned char fpstate[FPCONTEXT_SIZE];
618 int context_size = CPU_IS_060 ? 8 : 0;
619 int err = 0;
620
621 if (FPU_IS_EMU) {
622 /* save fpu control register */
623 err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpcntl,
624 current->thread.fpcntl, 12);
625 /* save all other fpu register */
626 err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpregs,
627 current->thread.fp, 96);
628 return err;
629 }
630
631 #ifdef CONFIG_CFV4E
632 __asm__ volatile ("fsave %0\n\t"
633 QCHIP_RESTORE_DIRECTIVE
634 : : "m" (*fpstate) : "memory");
635 #endif
636 err |= __put_user(*(long *)fpstate, (long *)&uc->uc_fpstate);
637 if (CPU_IS_060 ? fpstate[2] : fpstate[0]) {
638 fpregset_t fpregs;
639 if (!CPU_IS_060)
640 context_size = fpstate[1];
641 fpu_version = fpstate[0];
642 #ifdef CONFIG_CFV4E
643 __asm__ volatile ("fmovemd %/fp0-%/fp7,%0"
644 : : "m" (fpregs.f_fpregs[0][0])
645 : "memory");
646 __asm__ volatile ("fmovel %/fpcr,%0"
647 : : "m" (fpregs.f_fpcntl[0])
648 : "memory");
649 __asm__ volatile ("fmovel %/fpsr,%0"
650 : : "m" (fpregs.f_fpcntl[1])
651 : "memory");
652 __asm__ volatile ("fmovel %/fpiar,%0"
653 : : "m" (fpregs.f_fpcntl[2])
654 : "memory");
655 #endif
656 err |= copy_to_user(&uc->uc_mcontext.fpregs, &fpregs,
657 sizeof(fpregs));
658 }
659 if (context_size)
660 err |= copy_to_user((long *)&uc->uc_fpstate + 1, fpstate + 4,
661 context_size);
662 return err;
663
664
665 return err;
666 }
667 #endif
668
669 static void setup_sigcontext(struct sigcontext *sc, struct pt_regs *regs,
670 unsigned long mask)
671 {
672 sc->sc_mask = mask;
673 sc->sc_usp = rdusp();
674 sc->sc_d0 = regs->d0;
675 sc->sc_d1 = regs->d1;
676 sc->sc_a0 = regs->a0;
677 sc->sc_a1 = regs->a1;
678 sc->sc_sr = regs->sr;
679 sc->sc_pc = regs->pc;
680 sc->sc_formatvec = regs->format << 12 | regs->vector;
681 #ifdef CONFIG_FPU
682 save_fpu_state(sc, regs);
683 #endif
684 }
685
686 static inline int rt_setup_ucontext(struct ucontext __user *uc,
687 struct pt_regs *regs)
688 {
689 struct switch_stack *sw = (struct switch_stack *)regs - 1;
690 greg_t __user *gregs = uc->uc_mcontext.gregs;
691 int err = 0;
692
693 err |= __put_user(MCONTEXT_VERSION, &uc->uc_mcontext.version);
694 err |= __put_user(regs->d0, &gregs[0]);
695 err |= __put_user(regs->d1, &gregs[1]);
696 err |= __put_user(regs->d2, &gregs[2]);
697 err |= __put_user(regs->d3, &gregs[3]);
698 err |= __put_user(regs->d4, &gregs[4]);
699 err |= __put_user(regs->d5, &gregs[5]);
700 err |= __put_user(sw->d6, &gregs[6]);
701 err |= __put_user(sw->d7, &gregs[7]);
702 err |= __put_user(regs->a0, &gregs[8]);
703 err |= __put_user(regs->a1, &gregs[9]);
704 err |= __put_user(regs->a2, &gregs[10]);
705 err |= __put_user(sw->a3, &gregs[11]);
706 err |= __put_user(sw->a4, &gregs[12]);
707 err |= __put_user(sw->a5, &gregs[13]);
708 err |= __put_user(sw->a6, &gregs[14]);
709 err |= __put_user(rdusp(), &gregs[15]);
710 err |= __put_user(regs->pc, &gregs[16]);
711 err |= __put_user(regs->sr, &gregs[17]);
712 err |= __put_user((regs->format << 12) | regs->vector,
713 &uc->uc_formatvec);
714 #ifdef CONFIG_FPU
715 err |= rt_save_fpu_state(uc, regs);
716 #endif
717 return err;
718 }
719
720 static inline void push_cache(unsigned long vaddr)
721 {
722 #ifdef CONFIG_M5445X
723 pgd_t *pdir;
724 pmd_t *pmdp;
725 pte_t *ptep;
726 unsigned long paddr;
727
728 pdir = pgd_offset(current->mm, vaddr);
729 pmdp = pmd_offset(pdir, vaddr);
730 ptep = pte_offset_map(pmdp, vaddr);
731 paddr = ((pte_val(*ptep) & PAGE_MASK) | (vaddr & ~PAGE_MASK));
732 cf_icache_flush_range(paddr, paddr + 8);
733 #elif CONFIG_M547X_8X
734 flush_icache_range(vaddr, vaddr + 8);
735 #endif
736 }
737
738 static inline void __user *
739 get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size)
740 {
741 unsigned long usp;
742
743 /* Default to using normal stack. */
744 usp = rdusp();
745
746 /* This is the X/Open sanctioned signal stack switching. */
747 if (ka->sa.sa_flags & SA_ONSTACK) {
748 if (!sas_ss_flags(usp))
749 usp = current->sas_ss_sp + current->sas_ss_size;
750 }
751 return (void __user *)((usp - frame_size) & -8UL);
752 }
753
754 static void setup_frame(int sig, struct k_sigaction *ka,
755 sigset_t *set, struct pt_regs *regs)
756 {
757 struct sigframe __user *frame;
758 int fsize = frame_extra_sizes[regs->format];
759 struct sigcontext context;
760 int err = 0;
761
762 if (fsize < 0) {
763 #ifdef DEBUG
764 printk(KERN_DEBUG "setup_frame: Unknown frame format %#x\n",
765 regs->format);
766 #endif
767 goto give_sigsegv;
768 }
769
770 frame = get_sigframe(ka, regs, sizeof(*frame));
771
772 err |= __put_user((current_thread_info()->exec_domain
773 && current_thread_info()->exec_domain->signal_invmap
774 && sig < 32
775 ? current_thread_info()->exec_domain->signal_invmap[sig]
776 : sig),
777 &frame->sig);
778
779 err |= __put_user(regs->vector, &frame->code);
780 err |= __put_user(&frame->sc, &frame->psc);
781
782 if (_NSIG_WORDS > 1)
783 err |= copy_to_user(frame->extramask, &set->sig[1],
784 sizeof(frame->extramask));
785
786 setup_sigcontext(&context, regs, set->sig[0]);
787 err |= copy_to_user(&frame->sc, &context, sizeof(context));
788
789 /* Set up to return from userspace. */
790 err |= __put_user(frame->retcode, &frame->pretcode);
791 /* moveq #,d0; trap #0 */
792 err |= __put_user(0x70004e40 + (__NR_sigreturn << 16),
793 (long __user *)(frame->retcode));
794
795 if (err)
796 goto give_sigsegv;
797
798 push_cache((unsigned long) &frame->retcode);
799
800 /* Set up registers for signal handler */
801 wrusp((unsigned long) frame);
802 regs->pc = (unsigned long) ka->sa.sa_handler;
803
804 adjust_stack:
805 /* Prepare to skip over the extra stuff in the exception frame. */
806 if (regs->stkadj) {
807 struct pt_regs *tregs =
808 (struct pt_regs *)((ulong)regs + regs->stkadj);
809 #ifdef DEBUG
810 printk(KERN_DEBUG "Performing stackadjust=%04x\n",
811 regs->stkadj);
812 #endif
813 /* This must be copied with decreasing addresses to
814 handle overlaps. */
815 tregs->vector = 0;
816 tregs->format = 0;
817 tregs->pc = regs->pc;
818 tregs->sr = regs->sr;
819 }
820 return;
821
822 give_sigsegv:
823 force_sigsegv(sig, current);
824 goto adjust_stack;
825 }
826
827 static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
828 sigset_t *set, struct pt_regs *regs)
829 {
830 struct rt_sigframe __user *frame;
831 int fsize = frame_extra_sizes[regs->format];
832 int err = 0;
833
834 if (fsize < 0) {
835 #ifdef DEBUG
836 printk(KERN_DEBUG "setup_frame: Unknown frame format %#x\n",
837 regs->format);
838 #endif
839 goto give_sigsegv;
840 }
841
842 frame = get_sigframe(ka, regs, sizeof(*frame));
843
844 if (fsize) {
845 err |= copy_to_user(&frame->uc.uc_extra, regs + 1, fsize);
846 regs->stkadj = fsize;
847 }
848
849 err |= __put_user((current_thread_info()->exec_domain
850 && current_thread_info()->exec_domain->signal_invmap
851 && sig < 32
852 ? current_thread_info()->exec_domain->signal_invmap[sig]
853 : sig),
854 &frame->sig);
855 err |= __put_user(&frame->info, &frame->pinfo);
856 err |= __put_user(&frame->uc, &frame->puc);
857 err |= copy_siginfo_to_user(&frame->info, info);
858
859 /* Create the ucontext. */
860 err |= __put_user(0, &frame->uc.uc_flags);
861 err |= __put_user(NULL, &frame->uc.uc_link);
862 err |= __put_user((void __user *)current->sas_ss_sp,
863 &frame->uc.uc_stack.ss_sp);
864 err |= __put_user(sas_ss_flags(rdusp()),
865 &frame->uc.uc_stack.ss_flags);
866 err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
867 err |= rt_setup_ucontext(&frame->uc, regs);
868 err |= copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
869
870 /* Set up to return from userspace. */
871 err |= __put_user(frame->retcode, &frame->pretcode);
872
873 /* movel #__NR_rt_sigreturn(0xAD),d0; trap #0 */
874 err |= __put_user(0x203c0000, (long *)(frame->retcode + 0));
875 err |= __put_user(0x00ad4e40, (long *)(frame->retcode + 4));
876
877 if (err)
878 goto give_sigsegv;
879
880 push_cache((unsigned long) &frame->retcode);
881
882 /* Set up registers for signal handler */
883 wrusp((unsigned long) frame);
884 regs->pc = (unsigned long) ka->sa.sa_handler;
885
886 adjust_stack:
887 /* Prepare to skip over the extra stuff in the exception frame. */
888 if (regs->stkadj) {
889 struct pt_regs *tregs =
890 (struct pt_regs *)((ulong)regs + regs->stkadj);
891 #ifdef DEBUG
892 printk(KERN_DEBUG "Performing stackadjust=%04x\n",
893 regs->stkadj);
894 #endif
895 /* This must be copied with decreasing addresses to
896 handle overlaps. */
897 tregs->vector = 0;
898 tregs->format = 0;
899 tregs->pc = regs->pc;
900 tregs->sr = regs->sr;
901 }
902 return;
903
904 give_sigsegv:
905 force_sigsegv(sig, current);
906 goto adjust_stack;
907 }
908
909 static inline void
910 handle_restart(struct pt_regs *regs, struct k_sigaction *ka, int has_handler)
911 {
912 switch (regs->d0) {
913 case -ERESTARTNOHAND:
914 if (!has_handler)
915 goto do_restart;
916 regs->d0 = -EINTR;
917 break;
918
919 case -ERESTARTSYS:
920 if (has_handler && !(ka->sa.sa_flags & SA_RESTART)) {
921 regs->d0 = -EINTR;
922 break;
923 }
924 /* fallthrough */
925 case -ERESTARTNOINTR:
926 do_restart:
927 regs->d0 = regs->orig_d0;
928 regs->pc -= 2;
929 break;
930 }
931 }
932
933 /*
934 * OK, we're invoking a handler
935 */
936 static void
937 handle_signal(int sig, struct k_sigaction *ka, siginfo_t *info,
938 sigset_t *oldset, struct pt_regs *regs)
939 {
940 /* are we from a system call? */
941 if (regs->orig_d0 >= 0)
942 /* If so, check system call restarting.. */
943 handle_restart(regs, ka, 1);
944
945 /* set up the stack frame */
946 if (ka->sa.sa_flags & SA_SIGINFO)
947 setup_rt_frame(sig, ka, info, oldset, regs);
948 else
949 setup_frame(sig, ka, oldset, regs);
950
951 if (ka->sa.sa_flags & SA_ONESHOT)
952 ka->sa.sa_handler = SIG_DFL;
953
954 spin_lock_irq(&current->sighand->siglock);
955 sigorsets(&current->blocked, &current->blocked, &ka->sa.sa_mask);
956 if (!(ka->sa.sa_flags & SA_NODEFER))
957 sigaddset(&current->blocked, sig);
958 recalc_sigpending();
959 spin_unlock_irq(&current->sighand->siglock);
960 }
961
962 /*
963 * Note that 'init' is a special process: it doesn't get signals it doesn't
964 * want to handle. Thus you cannot kill init even with a SIGKILL even by
965 * mistake.
966 */
967 asmlinkage int do_signal(sigset_t *oldset, struct pt_regs *regs)
968 {
969 siginfo_t info;
970 struct k_sigaction ka;
971 int signr;
972
973 current->thread.esp0 = (unsigned long) regs;
974
975 if (!oldset)
976 oldset = &current->blocked;
977
978 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
979 if (signr > 0) {
980 /* Whee! Actually deliver the signal. */
981 handle_signal(signr, &ka, &info, oldset, regs);
982 return 1;
983 }
984
985 /* Did we come from a system call? */
986 if (regs->orig_d0 >= 0)
987 /* Restart the system call - no handlers present */
988 handle_restart(regs, NULL, 0);
989
990 return 0;
991 }
Staging tree of Christian Lamparter