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drivers: power: report battery voltage in AOSP compatible format
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / m68k / kernel / signal.c
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0c22fafd
GU		 1/*
2 * linux/arch/m68k/kernel/signal.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 *
6 * This file is subject to the terms and conditions of the GNU General Public
7 * License. See the file COPYING in the main directory of this archive
8 * for more details.
9 */
10
11/*
12 * Linux/m68k support by Hamish Macdonald
13 *
14 * 68060 fixes by Jesper Skov
15 *
16 * 1997-12-01 Modified for POSIX.1b signals by Andreas Schwab
17 *
18 * mathemu support by Roman Zippel
19 * (Note: fpstate in the signal context is completely ignored for the emulator
20 * and the internal floating point format is put on stack)
21 */
22
23/*
24 * ++roman (07/09/96): implemented signal stacks (specially for tosemu on
25 * Atari :-) Current limitation: Only one sigstack can be active at one time.
26 * If a second signal with SA_ONSTACK set arrives while working on a sigstack,
27 * SA_ONSTACK is ignored. This behaviour avoids lots of trouble with nested
28 * signal handlers!
29 */
30
31#include <linux/sched.h>
32#include <linux/mm.h>
33#include <linux/kernel.h>
34#include <linux/signal.h>
35#include <linux/syscalls.h>
36#include <linux/errno.h>
37#include <linux/wait.h>
38#include <linux/ptrace.h>
39#include <linux/unistd.h>
40#include <linux/stddef.h>
41#include <linux/highuid.h>
42#include <linux/personality.h>
43#include <linux/tty.h>
44#include <linux/binfmts.h>
45#include <linux/module.h>
a54f1655 46#include <linux/tracehook.h>
0c22fafd
GU		 47
48#include <asm/setup.h>
49#include <asm/uaccess.h>
50#include <asm/pgtable.h>
51#include <asm/traps.h>
52#include <asm/ucontext.h>
53
66d857b0 54#ifdef CONFIG_MMU
0c22fafd
GU		 55
56/*
57 * Handle the slight differences in classic 68k and ColdFire trap frames.
58 */
59#ifdef CONFIG_COLDFIRE
60#define FORMAT 4
61#define FMT4SIZE 0
00ebfe58 62#else
0c22fafd
GU		 63#define FORMAT 0
64#define FMT4SIZE sizeof(((struct frame *)0)->un.fmt4)
1da177e4 65#endif
0c22fafd
GU		 66
67static const int frame_size_change[16] = {
68 [1] = -1, /* sizeof(((struct frame *)0)->un.fmt1), */
69 [2] = sizeof(((struct frame *)0)->un.fmt2),
70 [3] = sizeof(((struct frame *)0)->un.fmt3),
71 [4] = FMT4SIZE,
72 [5] = -1, /* sizeof(((struct frame *)0)->un.fmt5), */
73 [6] = -1, /* sizeof(((struct frame *)0)->un.fmt6), */
74 [7] = sizeof(((struct frame *)0)->un.fmt7),
75 [8] = -1, /* sizeof(((struct frame *)0)->un.fmt8), */
76 [9] = sizeof(((struct frame *)0)->un.fmt9),
77 [10] = sizeof(((struct frame *)0)->un.fmta),
78 [11] = sizeof(((struct frame *)0)->un.fmtb),
79 [12] = -1, /* sizeof(((struct frame *)0)->un.fmtc), */
80 [13] = -1, /* sizeof(((struct frame *)0)->un.fmtd), */
81 [14] = -1, /* sizeof(((struct frame *)0)->un.fmte), */
82 [15] = -1, /* sizeof(((struct frame *)0)->un.fmtf), */
83};
84
85static inline int frame_extra_sizes(int f)
86{
87 return frame_size_change[f];
88}
89
90int handle_kernel_fault(struct pt_regs *regs)
91{
92 const struct exception_table_entry *fixup;
93 struct pt_regs *tregs;
94
95 /* Are we prepared to handle this kernel fault? */
96 fixup = search_exception_tables(regs->pc);
97 if (!fixup)
98 return 0;
99
100 /* Create a new four word stack frame, discarding the old one. */
101 regs->stkadj = frame_extra_sizes(regs->format);
102 tregs = (struct pt_regs *)((long)regs + regs->stkadj);
103 tregs->vector = regs->vector;
104 tregs->format = FORMAT;
105 tregs->pc = fixup->fixup;
106 tregs->sr = regs->sr;
107
108 return 1;
109}
110
b7f9591c 111void ptrace_signal_deliver(void)
0c22fafd 112{
b7f9591c 113 struct pt_regs *regs = signal_pt_regs();
0c22fafd
GU		 114 if (regs->orig_d0 < 0)
115 return;
116 switch (regs->d0) {
117 case -ERESTARTNOHAND:
118 case -ERESTARTSYS:
119 case -ERESTARTNOINTR:
120 regs->d0 = regs->orig_d0;
121 regs->orig_d0 = -1;
122 regs->pc -= 2;
123 break;
124 }
125}
126
127static inline void push_cache (unsigned long vaddr)
128{
129 /*
130 * Using the old cache_push_v() was really a big waste.
131 *
132 * What we are trying to do is to flush 8 bytes to ram.
133 * Flushing 2 cache lines of 16 bytes is much cheaper than
134 * flushing 1 or 2 pages, as previously done in
135 * cache_push_v().
136 * Jes
137 */
138 if (CPU_IS_040) {
139 unsigned long temp;
140
141 __asm__ __volatile__ (".chip 68040\n\t"
142 "nop\n\t"
143 "ptestr (%1)\n\t"
144 "movec %%mmusr,%0\n\t"
145 ".chip 68k"
146 : "=r" (temp)
147 : "a" (vaddr));
148
149 temp &= PAGE_MASK;
150 temp |= vaddr & ~PAGE_MASK;
151
152 __asm__ __volatile__ (".chip 68040\n\t"
153 "nop\n\t"
154 "cpushl %%bc,(%0)\n\t"
155 ".chip 68k"
156 : : "a" (temp));
157 }
158 else if (CPU_IS_060) {
159 unsigned long temp;
160 __asm__ __volatile__ (".chip 68060\n\t"
161 "plpar (%0)\n\t"
162 ".chip 68k"
163 : "=a" (temp)
164 : "0" (vaddr));
165 __asm__ __volatile__ (".chip 68060\n\t"
166 "cpushl %%bc,(%0)\n\t"
167 ".chip 68k"
168 : : "a" (temp));
169 } else if (!CPU_IS_COLDFIRE) {
170 /*
171 * 68030/68020 have no writeback cache;
172 * still need to clear icache.
173 * Note that vaddr is guaranteed to be long word aligned.
174 */
175 unsigned long temp;
176 asm volatile ("movec %%cacr,%0" : "=r" (temp));
177 temp += 4;
178 asm volatile ("movec %0,%%caar\n\t"
179 "movec %1,%%cacr"
180 : : "r" (vaddr), "r" (temp));
181 asm volatile ("movec %0,%%caar\n\t"
182 "movec %1,%%cacr"
183 : : "r" (vaddr + 4), "r" (temp));
184 }
185}
186
187static inline void adjustformat(struct pt_regs *regs)
188{
189}
190
191static inline void save_a5_state(struct sigcontext *sc, struct pt_regs *regs)
192{
193}
194
195#else /* CONFIG_MMU */
196
197void ret_from_user_signal(void);
198void ret_from_user_rt_signal(void);
199
200static inline int frame_extra_sizes(int f)
201{
202 /* No frame size adjustments required on non-MMU CPUs */
203 return 0;
204}
205
206static inline void adjustformat(struct pt_regs *regs)
207{
208 ((struct switch_stack *)regs - 1)->a5 = current->mm->start_data;
209 /*
210 * set format byte to make stack appear modulo 4, which it will
211 * be when doing the rte
212 */
213 regs->format = 0x4;
214}
215
216static inline void save_a5_state(struct sigcontext *sc, struct pt_regs *regs)
217{
218 sc->sc_a5 = ((struct switch_stack *)regs - 1)->a5;
219}
220
221static inline void push_cache(unsigned long vaddr)
222{
223}
224
225#endif /* CONFIG_MMU */
226
0c22fafd
GU		 227/*
228 * Do a signal return; undo the signal stack.
229 *
230 * Keep the return code on the stack quadword aligned!
231 * That makes the cache flush below easier.
232 */
233
234struct sigframe
235{
236 char __user *pretcode;
237 int sig;
238 int code;
239 struct sigcontext __user *psc;
240 char retcode[8];
241 unsigned long extramask[_NSIG_WORDS-1];
242 struct sigcontext sc;
243};
244
245struct rt_sigframe
246{
247 char __user *pretcode;
248 int sig;
249 struct siginfo __user *pinfo;
250 void __user *puc;
251 char retcode[8];
252 struct siginfo info;
253 struct ucontext uc;
254};
255
256#define FPCONTEXT_SIZE 216
257#define uc_fpstate uc_filler[0]
258#define uc_formatvec uc_filler[FPCONTEXT_SIZE/4]
259#define uc_extra uc_filler[FPCONTEXT_SIZE/4+1]
260
261#ifdef CONFIG_FPU
262
263static unsigned char fpu_version; /* version number of fpu, set by setup_frame */
264
265static inline int restore_fpu_state(struct sigcontext *sc)
266{
267 int err = 1;
268
269 if (FPU_IS_EMU) {
270 /* restore registers */
271 memcpy(current->thread.fpcntl, sc->sc_fpcntl, 12);
272 memcpy(current->thread.fp, sc->sc_fpregs, 24);
273 return 0;
274 }
275
276 if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) {
277 /* Verify the frame format. */
278 if (!(CPU_IS_060 || CPU_IS_COLDFIRE) &&
279 (sc->sc_fpstate[0] != fpu_version))
280 goto out;
281 if (CPU_IS_020_OR_030) {
282 if (m68k_fputype & FPU_68881 &&
283 !(sc->sc_fpstate[1] == 0x18 || sc->sc_fpstate[1] == 0xb4))
284 goto out;
285 if (m68k_fputype & FPU_68882 &&
286 !(sc->sc_fpstate[1] == 0x38 || sc->sc_fpstate[1] == 0xd4))
287 goto out;
288 } else if (CPU_IS_040) {
289 if (!(sc->sc_fpstate[1] == 0x00 ||
290 sc->sc_fpstate[1] == 0x28 ||
291 sc->sc_fpstate[1] == 0x60))
292 goto out;
293 } else if (CPU_IS_060) {
294 if (!(sc->sc_fpstate[3] == 0x00 ||
295 sc->sc_fpstate[3] == 0x60 ||
296 sc->sc_fpstate[3] == 0xe0))
297 goto out;
298 } else if (CPU_IS_COLDFIRE) {
299 if (!(sc->sc_fpstate[0] == 0x00 ||
300 sc->sc_fpstate[0] == 0x05 ||
301 sc->sc_fpstate[0] == 0xe5))
302 goto out;
303 } else
304 goto out;
305
306 if (CPU_IS_COLDFIRE) {
307 __asm__ volatile ("fmovemd %0,%%fp0-%%fp1\n\t"
308 "fmovel %1,%%fpcr\n\t"
309 "fmovel %2,%%fpsr\n\t"
310 "fmovel %3,%%fpiar"
311 : /* no outputs */
312 : "m" (sc->sc_fpregs[0]),
313 "m" (sc->sc_fpcntl[0]),
314 "m" (sc->sc_fpcntl[1]),
315 "m" (sc->sc_fpcntl[2]));
316 } else {
317 __asm__ volatile (".chip 68k/68881\n\t"
318 "fmovemx %0,%%fp0-%%fp1\n\t"
319 "fmoveml %1,%%fpcr/%%fpsr/%%fpiar\n\t"
320 ".chip 68k"
321 : /* no outputs */
322 : "m" (*sc->sc_fpregs),
323 "m" (*sc->sc_fpcntl));
324 }
325 }
326
327 if (CPU_IS_COLDFIRE) {
328 __asm__ volatile ("frestore %0" : : "m" (*sc->sc_fpstate));
329 } else {
330 __asm__ volatile (".chip 68k/68881\n\t"
331 "frestore %0\n\t"
332 ".chip 68k"
333 : : "m" (*sc->sc_fpstate));
334 }
335 err = 0;
336
337out:
338 return err;
339}
340
341static inline int rt_restore_fpu_state(struct ucontext __user *uc)
342{
343 unsigned char fpstate[FPCONTEXT_SIZE];
344 int context_size = CPU_IS_060 ? 8 : (CPU_IS_COLDFIRE ? 12 : 0);
345 fpregset_t fpregs;
346 int err = 1;
347
348 if (FPU_IS_EMU) {
349 /* restore fpu control register */
350 if (__copy_from_user(current->thread.fpcntl,
351 uc->uc_mcontext.fpregs.f_fpcntl, 12))
352 goto out;
353 /* restore all other fpu register */
354 if (__copy_from_user(current->thread.fp,
355 uc->uc_mcontext.fpregs.f_fpregs, 96))
356 goto out;
357 return 0;
358 }
359
360 if (__get_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate))
361 goto out;
362 if (CPU_IS_060 ? fpstate[2] : fpstate[0]) {
363 if (!(CPU_IS_060 || CPU_IS_COLDFIRE))
364 context_size = fpstate[1];
365 /* Verify the frame format. */
366 if (!(CPU_IS_060 || CPU_IS_COLDFIRE) &&
367 (fpstate[0] != fpu_version))
368 goto out;
369 if (CPU_IS_020_OR_030) {
370 if (m68k_fputype & FPU_68881 &&
371 !(context_size == 0x18 || context_size == 0xb4))
372 goto out;
373 if (m68k_fputype & FPU_68882 &&
374 !(context_size == 0x38 || context_size == 0xd4))
375 goto out;
376 } else if (CPU_IS_040) {
377 if (!(context_size == 0x00 ||
378 context_size == 0x28 ||
379 context_size == 0x60))
380 goto out;
381 } else if (CPU_IS_060) {
382 if (!(fpstate[3] == 0x00 ||
383 fpstate[3] == 0x60 ||
384 fpstate[3] == 0xe0))
385 goto out;
386 } else if (CPU_IS_COLDFIRE) {
387 if (!(fpstate[3] == 0x00 ||
388 fpstate[3] == 0x05 ||
389 fpstate[3] == 0xe5))
390 goto out;
391 } else
392 goto out;
393 if (__copy_from_user(&fpregs, &uc->uc_mcontext.fpregs,
394 sizeof(fpregs)))
395 goto out;
396
397 if (CPU_IS_COLDFIRE) {
398 __asm__ volatile ("fmovemd %0,%%fp0-%%fp7\n\t"
399 "fmovel %1,%%fpcr\n\t"
400 "fmovel %2,%%fpsr\n\t"
401 "fmovel %3,%%fpiar"
402 : /* no outputs */
403 : "m" (fpregs.f_fpregs[0]),
404 "m" (fpregs.f_fpcntl[0]),
405 "m" (fpregs.f_fpcntl[1]),
406 "m" (fpregs.f_fpcntl[2]));
407 } else {
408 __asm__ volatile (".chip 68k/68881\n\t"
409 "fmovemx %0,%%fp0-%%fp7\n\t"
410 "fmoveml %1,%%fpcr/%%fpsr/%%fpiar\n\t"
411 ".chip 68k"
412 : /* no outputs */
413 : "m" (*fpregs.f_fpregs),
414 "m" (*fpregs.f_fpcntl));
415 }
416 }
417 if (context_size &&
418 __copy_from_user(fpstate + 4, (long __user *)&uc->uc_fpstate + 1,
419 context_size))
420 goto out;
421
422 if (CPU_IS_COLDFIRE) {
423 __asm__ volatile ("frestore %0" : : "m" (*fpstate));
424 } else {
425 __asm__ volatile (".chip 68k/68881\n\t"
426 "frestore %0\n\t"
427 ".chip 68k"
428 : : "m" (*fpstate));
429 }
430 err = 0;
431
432out:
433 return err;
434}
435
436/*
437 * Set up a signal frame.
438 */
439static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs)
440{
441 if (FPU_IS_EMU) {
442 /* save registers */
443 memcpy(sc->sc_fpcntl, current->thread.fpcntl, 12);
444 memcpy(sc->sc_fpregs, current->thread.fp, 24);
445 return;
446 }
447
448 if (CPU_IS_COLDFIRE) {
449 __asm__ volatile ("fsave %0"
450 : : "m" (*sc->sc_fpstate) : "memory");
451 } else {
452 __asm__ volatile (".chip 68k/68881\n\t"
453 "fsave %0\n\t"
454 ".chip 68k"
455 : : "m" (*sc->sc_fpstate) : "memory");
456 }
457
458 if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) {
459 fpu_version = sc->sc_fpstate[0];
460 if (CPU_IS_020_OR_030 &&
461 regs->vector >= (VEC_FPBRUC * 4) &&
462 regs->vector <= (VEC_FPNAN * 4)) {
463 /* Clear pending exception in 68882 idle frame */
464 if (*(unsigned short *) sc->sc_fpstate == 0x1f38)
465 sc->sc_fpstate[0x38] |= 1 << 3;
466 }
467
468 if (CPU_IS_COLDFIRE) {
469 __asm__ volatile ("fmovemd %%fp0-%%fp1,%0\n\t"
470 "fmovel %%fpcr,%1\n\t"
471 "fmovel %%fpsr,%2\n\t"
472 "fmovel %%fpiar,%3"
473 : "=m" (sc->sc_fpregs[0]),
474 "=m" (sc->sc_fpcntl[0]),
475 "=m" (sc->sc_fpcntl[1]),
476 "=m" (sc->sc_fpcntl[2])
477 : /* no inputs */
478 : "memory");
479 } else {
480 __asm__ volatile (".chip 68k/68881\n\t"
481 "fmovemx %%fp0-%%fp1,%0\n\t"
482 "fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t"
483 ".chip 68k"
484 : "=m" (*sc->sc_fpregs),
485 "=m" (*sc->sc_fpcntl)
486 : /* no inputs */
487 : "memory");
488 }
489 }
490}
491
492static inline int rt_save_fpu_state(struct ucontext __user *uc, struct pt_regs *regs)
493{
494 unsigned char fpstate[FPCONTEXT_SIZE];
495 int context_size = CPU_IS_060 ? 8 : (CPU_IS_COLDFIRE ? 12 : 0);
496 int err = 0;
497
498 if (FPU_IS_EMU) {
499 /* save fpu control register */
500 err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpcntl,
501 current->thread.fpcntl, 12);
502 /* save all other fpu register */
503 err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpregs,
504 current->thread.fp, 96);
505 return err;
506 }
507
508 if (CPU_IS_COLDFIRE) {
509 __asm__ volatile ("fsave %0" : : "m" (*fpstate) : "memory");
510 } else {
511 __asm__ volatile (".chip 68k/68881\n\t"
512 "fsave %0\n\t"
513 ".chip 68k"
514 : : "m" (*fpstate) : "memory");
515 }
516
517 err |= __put_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate);
518 if (CPU_IS_060 ? fpstate[2] : fpstate[0]) {
519 fpregset_t fpregs;
520 if (!(CPU_IS_060 || CPU_IS_COLDFIRE))
521 context_size = fpstate[1];
522 fpu_version = fpstate[0];
523 if (CPU_IS_020_OR_030 &&
524 regs->vector >= (VEC_FPBRUC * 4) &&
525 regs->vector <= (VEC_FPNAN * 4)) {
526 /* Clear pending exception in 68882 idle frame */
527 if (*(unsigned short *) fpstate == 0x1f38)
528 fpstate[0x38] |= 1 << 3;
529 }
530 if (CPU_IS_COLDFIRE) {
531 __asm__ volatile ("fmovemd %%fp0-%%fp7,%0\n\t"
532 "fmovel %%fpcr,%1\n\t"
533 "fmovel %%fpsr,%2\n\t"
534 "fmovel %%fpiar,%3"
535 : "=m" (fpregs.f_fpregs[0]),
536 "=m" (fpregs.f_fpcntl[0]),
537 "=m" (fpregs.f_fpcntl[1]),
538 "=m" (fpregs.f_fpcntl[2])
539 : /* no inputs */
540 : "memory");
541 } else {
542 __asm__ volatile (".chip 68k/68881\n\t"
543 "fmovemx %%fp0-%%fp7,%0\n\t"
544 "fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t"
545 ".chip 68k"
546 : "=m" (*fpregs.f_fpregs),
547 "=m" (*fpregs.f_fpcntl)
548 : /* no inputs */
549 : "memory");
550 }
551 err |= copy_to_user(&uc->uc_mcontext.fpregs, &fpregs,
552 sizeof(fpregs));
553 }
554 if (context_size)
555 err |= copy_to_user((long __user *)&uc->uc_fpstate + 1, fpstate + 4,
556 context_size);
557 return err;
558}
559
560#else /* CONFIG_FPU */
561
562/*
563 * For the case with no FPU configured these all do nothing.
564 */
565static inline int restore_fpu_state(struct sigcontext *sc)
566{
567 return 0;
568}
569
570static inline int rt_restore_fpu_state(struct ucontext __user *uc)
571{
572 return 0;
573}
574
575static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs)
576{
577}
578
579static inline int rt_save_fpu_state(struct ucontext __user *uc, struct pt_regs *regs)
580{
581 return 0;
582}
583
584#endif /* CONFIG_FPU */
585
586static int mangle_kernel_stack(struct pt_regs *regs, int formatvec,
587 void __user *fp)
588{
589 int fsize = frame_extra_sizes(formatvec >> 12);
590 if (fsize < 0) {
591 /*
592 * user process trying to return with weird frame format
593 */
594#ifdef DEBUG
595 printk("user process returning with weird frame format\n");
596#endif
597 return 1;
598 }
599 if (!fsize) {
600 regs->format = formatvec >> 12;
601 regs->vector = formatvec & 0xfff;
602 } else {
603 struct switch_stack *sw = (struct switch_stack *)regs - 1;
604 unsigned long buf[fsize / 2]; /* yes, twice as much */
605
606 /* that'll make sure that expansion won't crap over data */
607 if (copy_from_user(buf + fsize / 4, fp, fsize))
608 return 1;
609
610 /* point of no return */
611 regs->format = formatvec >> 12;
612 regs->vector = formatvec & 0xfff;
613#define frame_offset (sizeof(struct pt_regs)+sizeof(struct switch_stack))
614 __asm__ __volatile__ (
615#ifdef CONFIG_COLDFIRE
616 " movel %0,%/sp\n\t"
617 " bra ret_from_signal\n"
618#else
619 " movel %0,%/a0\n\t"
620 " subl %1,%/a0\n\t" /* make room on stack */
621 " movel %/a0,%/sp\n\t" /* set stack pointer */
622 /* move switch_stack and pt_regs */
623 "1: movel %0@+,%/a0@+\n\t"
624 " dbra %2,1b\n\t"
625 " lea %/sp@(%c3),%/a0\n\t" /* add offset of fmt */
626 " lsrl #2,%1\n\t"
627 " subql #1,%1\n\t"
628 /* copy to the gap we'd made */
629 "2: movel %4@+,%/a0@+\n\t"
630 " dbra %1,2b\n\t"
631 " bral ret_from_signal\n"
632#endif
633 : /* no outputs, it doesn't ever return */
634 : "a" (sw), "d" (fsize), "d" (frame_offset/4-1),
635 "n" (frame_offset), "a" (buf + fsize/4)
636 : "a0");
637#undef frame_offset
638 }
639 return 0;
640}
641
642static inline int
643restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *usc, void __user *fp)
644{
645 int formatvec;
646 struct sigcontext context;
647 int err = 0;
648
649 /* Always make any pending restarted system calls return -EINTR */
650 current_thread_info()->restart_block.fn = do_no_restart_syscall;
651
652 /* get previous context */
653 if (copy_from_user(&context, usc, sizeof(context)))
654 goto badframe;
655
656 /* restore passed registers */
657 regs->d0 = context.sc_d0;
658 regs->d1 = context.sc_d1;
659 regs->a0 = context.sc_a0;
660 regs->a1 = context.sc_a1;
661 regs->sr = (regs->sr & 0xff00) | (context.sc_sr & 0xff);
662 regs->pc = context.sc_pc;
663 regs->orig_d0 = -1; /* disable syscall checks */
664 wrusp(context.sc_usp);
665 formatvec = context.sc_formatvec;
666
667 err = restore_fpu_state(&context);
668
669 if (err || mangle_kernel_stack(regs, formatvec, fp))
670 goto badframe;
671
672 return 0;
673
674badframe:
675 return 1;
676}
677
678static inline int
679rt_restore_ucontext(struct pt_regs *regs, struct switch_stack *sw,
680 struct ucontext __user *uc)
681{
682 int temp;
683 greg_t __user *gregs = uc->uc_mcontext.gregs;
684 unsigned long usp;
685 int err;
686
687 /* Always make any pending restarted system calls return -EINTR */
688 current_thread_info()->restart_block.fn = do_no_restart_syscall;
689
690 err = __get_user(temp, &uc->uc_mcontext.version);
691 if (temp != MCONTEXT_VERSION)
692 goto badframe;
693 /* restore passed registers */
694 err |= __get_user(regs->d0, &gregs[0]);
695 err |= __get_user(regs->d1, &gregs[1]);
696 err |= __get_user(regs->d2, &gregs[2]);
697 err |= __get_user(regs->d3, &gregs[3]);
698 err |= __get_user(regs->d4, &gregs[4]);
699 err |= __get_user(regs->d5, &gregs[5]);
700 err |= __get_user(sw->d6, &gregs[6]);
701 err |= __get_user(sw->d7, &gregs[7]);
702 err |= __get_user(regs->a0, &gregs[8]);
703 err |= __get_user(regs->a1, &gregs[9]);
704 err |= __get_user(regs->a2, &gregs[10]);
705 err |= __get_user(sw->a3, &gregs[11]);
706 err |= __get_user(sw->a4, &gregs[12]);
707 err |= __get_user(sw->a5, &gregs[13]);
708 err |= __get_user(sw->a6, &gregs[14]);
709 err |= __get_user(usp, &gregs[15]);
710 wrusp(usp);
711 err |= __get_user(regs->pc, &gregs[16]);
712 err |= __get_user(temp, &gregs[17]);
713 regs->sr = (regs->sr & 0xff00) | (temp & 0xff);
714 regs->orig_d0 = -1; /* disable syscall checks */
715 err |= __get_user(temp, &uc->uc_formatvec);
716
717 err |= rt_restore_fpu_state(uc);
08d4f653 718 err |= restore_altstack(&uc->uc_stack);
0c22fafd 719
08d4f653 720 if (err)
0c22fafd
GU		 721 goto badframe;
722
723 if (mangle_kernel_stack(regs, temp, &uc->uc_extra))
724 goto badframe;
725
726 return 0;
727
728badframe:
729 return 1;
730}
731
732asmlinkage int do_sigreturn(unsigned long __unused)
733{
734 struct switch_stack *sw = (struct switch_stack *) &__unused;
735 struct pt_regs *regs = (struct pt_regs *) (sw + 1);
736 unsigned long usp = rdusp();
737 struct sigframe __user *frame = (struct sigframe __user *)(usp - 4);
738 sigset_t set;
739
740 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
741 goto badframe;
742 if (__get_user(set.sig[0], &frame->sc.sc_mask) ||
743 (_NSIG_WORDS > 1 &&
744 __copy_from_user(&set.sig[1], &frame->extramask,
745 sizeof(frame->extramask))))
746 goto badframe;
747
43a35995 748 set_current_blocked(&set);
0c22fafd
GU		 749
750 if (restore_sigcontext(regs, &frame->sc, frame + 1))
751 goto badframe;
752 return regs->d0;
753
754badframe:
755 force_sig(SIGSEGV, current);
756 return 0;
757}
758
759asmlinkage int do_rt_sigreturn(unsigned long __unused)
760{
761 struct switch_stack *sw = (struct switch_stack *) &__unused;
762 struct pt_regs *regs = (struct pt_regs *) (sw + 1);
763 unsigned long usp = rdusp();
764 struct rt_sigframe __user *frame = (struct rt_sigframe __user *)(usp - 4);
765 sigset_t set;
766
767 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
768 goto badframe;
769 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
770 goto badframe;
771
43a35995 772 set_current_blocked(&set);
0c22fafd
GU		 773
774 if (rt_restore_ucontext(regs, sw, &frame->uc))
775 goto badframe;
776 return regs->d0;
777
778badframe:
779 force_sig(SIGSEGV, current);
780 return 0;
781}
782
783static void setup_sigcontext(struct sigcontext *sc, struct pt_regs *regs,
784 unsigned long mask)
785{
786 sc->sc_mask = mask;
787 sc->sc_usp = rdusp();
788 sc->sc_d0 = regs->d0;
789 sc->sc_d1 = regs->d1;
790 sc->sc_a0 = regs->a0;
791 sc->sc_a1 = regs->a1;
792 sc->sc_sr = regs->sr;
793 sc->sc_pc = regs->pc;
794 sc->sc_formatvec = regs->format << 12 | regs->vector;
795 save_a5_state(sc, regs);
796 save_fpu_state(sc, regs);
797}
798
799static inline int rt_setup_ucontext(struct ucontext __user *uc, struct pt_regs *regs)
800{
801 struct switch_stack *sw = (struct switch_stack *)regs - 1;
802 greg_t __user *gregs = uc->uc_mcontext.gregs;
803 int err = 0;
804
805 err |= __put_user(MCONTEXT_VERSION, &uc->uc_mcontext.version);
806 err |= __put_user(regs->d0, &gregs[0]);
807 err |= __put_user(regs->d1, &gregs[1]);
808 err |= __put_user(regs->d2, &gregs[2]);
809 err |= __put_user(regs->d3, &gregs[3]);
810 err |= __put_user(regs->d4, &gregs[4]);
811 err |= __put_user(regs->d5, &gregs[5]);
812 err |= __put_user(sw->d6, &gregs[6]);
813 err |= __put_user(sw->d7, &gregs[7]);
814 err |= __put_user(regs->a0, &gregs[8]);
815 err |= __put_user(regs->a1, &gregs[9]);
816 err |= __put_user(regs->a2, &gregs[10]);
817 err |= __put_user(sw->a3, &gregs[11]);
818 err |= __put_user(sw->a4, &gregs[12]);
819 err |= __put_user(sw->a5, &gregs[13]);
820 err |= __put_user(sw->a6, &gregs[14]);
821 err |= __put_user(rdusp(), &gregs[15]);
822 err |= __put_user(regs->pc, &gregs[16]);
823 err |= __put_user(regs->sr, &gregs[17]);
824 err |= __put_user((regs->format << 12) | regs->vector, &uc->uc_formatvec);
825 err |= rt_save_fpu_state(uc, regs);
826 return err;
827}
828
829static inline void __user *
830get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size)
831{
832 unsigned long usp;
833
834 /* Default to using normal stack. */
835 usp = rdusp();
836
837 /* This is the X/Open sanctioned signal stack switching. */
838 if (ka->sa.sa_flags & SA_ONSTACK) {
839 if (!sas_ss_flags(usp))
840 usp = current->sas_ss_sp + current->sas_ss_size;
841 }
842 return (void __user *)((usp - frame_size) & -8UL);
843}
844
845static int setup_frame (int sig, struct k_sigaction *ka,
846 sigset_t *set, struct pt_regs *regs)
847{
848 struct sigframe __user *frame;
849 int fsize = frame_extra_sizes(regs->format);
850 struct sigcontext context;
851 int err = 0;
852
853 if (fsize < 0) {
854#ifdef DEBUG
855 printk ("setup_frame: Unknown frame format %#x\n",
856 regs->format);
857#endif
858 goto give_sigsegv;
859 }
860
861 frame = get_sigframe(ka, regs, sizeof(*frame) + fsize);
862
863 if (fsize)
864 err |= copy_to_user (frame + 1, regs + 1, fsize);
865
866 err |= __put_user((current_thread_info()->exec_domain
867 && current_thread_info()->exec_domain->signal_invmap
868 && sig < 32
869 ? current_thread_info()->exec_domain->signal_invmap[sig]
870 : sig),
871 &frame->sig);
872
873 err |= __put_user(regs->vector, &frame->code);
874 err |= __put_user(&frame->sc, &frame->psc);
875
876 if (_NSIG_WORDS > 1)
877 err |= copy_to_user(frame->extramask, &set->sig[1],
878 sizeof(frame->extramask));
879
880 setup_sigcontext(&context, regs, set->sig[0]);
881 err |= copy_to_user (&frame->sc, &context, sizeof(context));
882
883 /* Set up to return from userspace. */
884#ifdef CONFIG_MMU
885 err |= __put_user(frame->retcode, &frame->pretcode);
886 /* moveq #,d0; trap #0 */
887 err |= __put_user(0x70004e40 + (__NR_sigreturn << 16),
888 (long __user *)(frame->retcode));
889#else
890 err |= __put_user((void *) ret_from_user_signal, &frame->pretcode);
891#endif
892
893 if (err)
894 goto give_sigsegv;
895
896 push_cache ((unsigned long) &frame->retcode);
897
898 /*
899 * Set up registers for signal handler. All the state we are about
900 * to destroy is successfully copied to sigframe.
901 */
902 wrusp ((unsigned long) frame);
903 regs->pc = (unsigned long) ka->sa.sa_handler;
904 adjustformat(regs);
905
906 /*
907 * This is subtle; if we build more than one sigframe, all but the
908 * first one will see frame format 0 and have fsize == 0, so we won't
909 * screw stkadj.
910 */
911 if (fsize)
912 regs->stkadj = fsize;
913
914 /* Prepare to skip over the extra stuff in the exception frame. */
915 if (regs->stkadj) {
916 struct pt_regs *tregs =
917 (struct pt_regs *)((ulong)regs + regs->stkadj);
918#ifdef DEBUG
919 printk("Performing stackadjust=%04x\n", regs->stkadj);
920#endif
921 /* This must be copied with decreasing addresses to
922 handle overlaps. */
923 tregs->vector = 0;
924 tregs->format = 0;
925 tregs->pc = regs->pc;
926 tregs->sr = regs->sr;
927 }
928 return 0;
929
930give_sigsegv:
931 force_sigsegv(sig, current);
932 return err;
933}
934
935static int setup_rt_frame (int sig, struct k_sigaction *ka, siginfo_t *info,
936 sigset_t *set, struct pt_regs *regs)
937{
938 struct rt_sigframe __user *frame;
939 int fsize = frame_extra_sizes(regs->format);
940 int err = 0;
941
942 if (fsize < 0) {
943#ifdef DEBUG
944 printk ("setup_frame: Unknown frame format %#x\n",
945 regs->format);
946#endif
947 goto give_sigsegv;
948 }
949
950 frame = get_sigframe(ka, regs, sizeof(*frame));
951
952 if (fsize)
953 err |= copy_to_user (&frame->uc.uc_extra, regs + 1, fsize);
954
955 err |= __put_user((current_thread_info()->exec_domain
956 && current_thread_info()->exec_domain->signal_invmap
957 && sig < 32
958 ? current_thread_info()->exec_domain->signal_invmap[sig]
959 : sig),
960 &frame->sig);
961 err |= __put_user(&frame->info, &frame->pinfo);
962 err |= __put_user(&frame->uc, &frame->puc);
963 err |= copy_siginfo_to_user(&frame->info, info);
964
965 /* Create the ucontext. */
966 err |= __put_user(0, &frame->uc.uc_flags);
967 err |= __put_user(NULL, &frame->uc.uc_link);
08d4f653 968 err |= __save_altstack(&frame->uc.uc_stack, rdusp());
0c22fafd
GU		 969 err |= rt_setup_ucontext(&frame->uc, regs);
970 err |= copy_to_user (&frame->uc.uc_sigmask, set, sizeof(*set));
971
972 /* Set up to return from userspace. */
973#ifdef CONFIG_MMU
974 err |= __put_user(frame->retcode, &frame->pretcode);
975#ifdef __mcoldfire__
976 /* movel #__NR_rt_sigreturn,d0; trap #0 */
977 err |= __put_user(0x203c0000, (long __user *)(frame->retcode + 0));
978 err |= __put_user(0x00004e40 + (__NR_rt_sigreturn << 16),
979 (long __user *)(frame->retcode + 4));
980#else
981 /* moveq #,d0; notb d0; trap #0 */
982 err |= __put_user(0x70004600 + ((__NR_rt_sigreturn ^ 0xff) << 16),
983 (long __user *)(frame->retcode + 0));
984 err |= __put_user(0x4e40, (short __user *)(frame->retcode + 4));
985#endif
986#else
987 err |= __put_user((void *) ret_from_user_rt_signal, &frame->pretcode);
988#endif /* CONFIG_MMU */
989
990 if (err)
991 goto give_sigsegv;
992
993 push_cache ((unsigned long) &frame->retcode);
994
995 /*
996 * Set up registers for signal handler. All the state we are about
997 * to destroy is successfully copied to sigframe.
998 */
999 wrusp ((unsigned long) frame);
1000 regs->pc = (unsigned long) ka->sa.sa_handler;
1001 adjustformat(regs);
1002
1003 /*
1004 * This is subtle; if we build more than one sigframe, all but the
1005 * first one will see frame format 0 and have fsize == 0, so we won't
1006 * screw stkadj.
1007 */
1008 if (fsize)
1009 regs->stkadj = fsize;
1010
1011 /* Prepare to skip over the extra stuff in the exception frame. */
1012 if (regs->stkadj) {
1013 struct pt_regs *tregs =
1014 (struct pt_regs *)((ulong)regs + regs->stkadj);
1015#ifdef DEBUG
1016 printk("Performing stackadjust=%04x\n", regs->stkadj);
1017#endif
1018 /* This must be copied with decreasing addresses to
1019 handle overlaps. */
1020 tregs->vector = 0;
1021 tregs->format = 0;
1022 tregs->pc = regs->pc;
1023 tregs->sr = regs->sr;
1024 }
1025 return 0;
1026
1027give_sigsegv:
1028 force_sigsegv(sig, current);
1029 return err;
1030}
1031
1032static inline void
1033handle_restart(struct pt_regs *regs, struct k_sigaction *ka, int has_handler)
1034{
1035 switch (regs->d0) {
1036 case -ERESTARTNOHAND:
1037 if (!has_handler)
1038 goto do_restart;
1039 regs->d0 = -EINTR;
1040 break;
1041
1042 case -ERESTART_RESTARTBLOCK:
1043 if (!has_handler) {
1044 regs->d0 = __NR_restart_syscall;
1045 regs->pc -= 2;
1046 break;
1047 }
1048 regs->d0 = -EINTR;
1049 break;
1050
1051 case -ERESTARTSYS:
1052 if (has_handler && !(ka->sa.sa_flags & SA_RESTART)) {
1053 regs->d0 = -EINTR;
1054 break;
1055 }
1056 /* fallthrough */
1057 case -ERESTARTNOINTR:
1058 do_restart:
1059 regs->d0 = regs->orig_d0;
1060 regs->pc -= 2;
1061 break;
1062 }
1063}
1064
1065/*
1066 * OK, we're invoking a handler
1067 */
1068static void
1069handle_signal(int sig, struct k_sigaction *ka, siginfo_t *info,
b7f9a11a 1070 struct pt_regs *regs)
0c22fafd 1071{
b7f9a11a 1072 sigset_t *oldset = sigmask_to_save();
0c22fafd
GU		 1073 int err;
1074 /* are we from a system call? */
1075 if (regs->orig_d0 >= 0)
1076 /* If so, check system call restarting.. */
1077 handle_restart(regs, ka, 1);
1078
1079 /* set up the stack frame */
1080 if (ka->sa.sa_flags & SA_SIGINFO)
1081 err = setup_rt_frame(sig, ka, info, oldset, regs);
1082 else
1083 err = setup_frame(sig, ka, oldset, regs);
1084
1085 if (err)
1086 return;
1087
efee984c 1088 signal_delivered(sig, info, ka, regs, 0);
0c22fafd
GU		 1089
1090 if (test_thread_flag(TIF_DELAYED_TRACE)) {
1091 regs->sr &= ~0x8000;
1092 send_sig(SIGTRAP, current, 1);
1093 }
0c22fafd
GU		 1094}
1095
1096/*
1097 * Note that 'init' is a special process: it doesn't get signals it doesn't
1098 * want to handle. Thus you cannot kill init even with a SIGKILL even by
1099 * mistake.
1100 */
a54f1655 1101static void do_signal(struct pt_regs *regs)
0c22fafd
GU		 1102{
1103 siginfo_t info;
1104 struct k_sigaction ka;
1105 int signr;
0c22fafd
GU		 1106
1107 current->thread.esp0 = (unsigned long) regs;
1108
0c22fafd
GU		 1109 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
1110 if (signr > 0) {
1111 /* Whee! Actually deliver the signal. */
b7f9a11a 1112 handle_signal(signr, &ka, &info, regs);
0c22fafd
GU		 1113 return;
1114 }
1115
1116 /* Did we come from a system call? */
1117 if (regs->orig_d0 >= 0)
1118 /* Restart the system call - no handlers present */
1119 handle_restart(regs, NULL, 0);
1120
1121 /* If there's no signal to deliver, we just restore the saved mask. */
51a7b448 1122 restore_saved_sigmask();
0c22fafd 1123}
a54f1655
AV		 1124
1125void do_notify_resume(struct pt_regs *regs)
1126{
1127 if (test_thread_flag(TIF_SIGPENDING))
1128 do_signal(regs);
1129
a42c6ded 1130 if (test_and_clear_thread_flag(TIF_NOTIFY_RESUME))
a54f1655 1131 tracehook_notify_resume(regs);
a54f1655 1132}
kernel source for telekom puls (alcatel/mediatek)