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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>
46#include <linux/tracehook.h>
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#include <asm/cacheflush.h>
54
55#ifdef CONFIG_MMU
56
57
58
59
60#ifdef CONFIG_COLDFIRE
61#define FORMAT 4
62#define FMT4SIZE 0
63#else
64#define FORMAT 0
65#define FMT4SIZE sizeof(((struct frame *)0)->un.fmt4)
66#endif
67
68static const int frame_size_change[16] = {
69 [1] = -1,
70 [2] = sizeof(((struct frame *)0)->un.fmt2),
71 [3] = sizeof(((struct frame *)0)->un.fmt3),
72 [4] = FMT4SIZE,
73 [5] = -1,
74 [6] = -1,
75 [7] = sizeof(((struct frame *)0)->un.fmt7),
76 [8] = -1,
77 [9] = sizeof(((struct frame *)0)->un.fmt9),
78 [10] = sizeof(((struct frame *)0)->un.fmta),
79 [11] = sizeof(((struct frame *)0)->un.fmtb),
80 [12] = -1,
81 [13] = -1,
82 [14] = -1,
83 [15] = -1,
84};
85
86static inline int frame_extra_sizes(int f)
87{
88 return frame_size_change[f];
89}
90
91int handle_kernel_fault(struct pt_regs *regs)
92{
93 const struct exception_table_entry *fixup;
94 struct pt_regs *tregs;
95
96
97 fixup = search_exception_tables(regs->pc);
98 if (!fixup)
99 return 0;
100
101
102 regs->stkadj = frame_extra_sizes(regs->format);
103 tregs = (struct pt_regs *)((long)regs + regs->stkadj);
104 tregs->vector = regs->vector;
105 tregs->format = FORMAT;
106 tregs->pc = fixup->fixup;
107 tregs->sr = regs->sr;
108
109 return 1;
110}
111
112void ptrace_signal_deliver(void)
113{
114 struct pt_regs *regs = signal_pt_regs();
115 if (regs->orig_d0 < 0)
116 return;
117 switch (regs->d0) {
118 case -ERESTARTNOHAND:
119 case -ERESTARTSYS:
120 case -ERESTARTNOINTR:
121 regs->d0 = regs->orig_d0;
122 regs->orig_d0 = -1;
123 regs->pc -= 2;
124 break;
125 }
126}
127
128static inline void push_cache (unsigned long vaddr)
129{
130
131
132
133
134
135
136
137
138
139 if (CPU_IS_040) {
140 unsigned long temp;
141
142 __asm__ __volatile__ (".chip 68040\n\t"
143 "nop\n\t"
144 "ptestr (%1)\n\t"
145 "movec %%mmusr,%0\n\t"
146 ".chip 68k"
147 : "=r" (temp)
148 : "a" (vaddr));
149
150 temp &= PAGE_MASK;
151 temp |= vaddr & ~PAGE_MASK;
152
153 __asm__ __volatile__ (".chip 68040\n\t"
154 "nop\n\t"
155 "cpushl %%bc,(%0)\n\t"
156 ".chip 68k"
157 : : "a" (temp));
158 }
159 else if (CPU_IS_060) {
160 unsigned long temp;
161 __asm__ __volatile__ (".chip 68060\n\t"
162 "plpar (%0)\n\t"
163 ".chip 68k"
164 : "=a" (temp)
165 : "0" (vaddr));
166 __asm__ __volatile__ (".chip 68060\n\t"
167 "cpushl %%bc,(%0)\n\t"
168 ".chip 68k"
169 : : "a" (temp));
170 } else if (!CPU_IS_COLDFIRE) {
171
172
173
174
175
176 unsigned long temp;
177 asm volatile ("movec %%cacr,%0" : "=r" (temp));
178 temp += 4;
179 asm volatile ("movec %0,%%caar\n\t"
180 "movec %1,%%cacr"
181 : : "r" (vaddr), "r" (temp));
182 asm volatile ("movec %0,%%caar\n\t"
183 "movec %1,%%cacr"
184 : : "r" (vaddr + 4), "r" (temp));
185 } else {
186
187#if defined(CONFIG_CACHE_COPYBACK)
188 flush_cf_dcache(0, DCACHE_MAX_ADDR);
189#endif
190
191 clear_cf_icache(vaddr, vaddr + 8);
192 }
193}
194
195static inline void adjustformat(struct pt_regs *regs)
196{
197}
198
199static inline void save_a5_state(struct sigcontext *sc, struct pt_regs *regs)
200{
201}
202
203#else
204
205void ret_from_user_signal(void);
206void ret_from_user_rt_signal(void);
207
208static inline int frame_extra_sizes(int f)
209{
210
211 return 0;
212}
213
214static inline void adjustformat(struct pt_regs *regs)
215{
216 ((struct switch_stack *)regs - 1)->a5 = current->mm->start_data;
217
218
219
220
221 regs->format = 0x4;
222}
223
224static inline void save_a5_state(struct sigcontext *sc, struct pt_regs *regs)
225{
226 sc->sc_a5 = ((struct switch_stack *)regs - 1)->a5;
227}
228
229static inline void push_cache(unsigned long vaddr)
230{
231}
232
233#endif
234
235
236
237
238
239
240
241
242struct sigframe
243{
244 char __user *pretcode;
245 int sig;
246 int code;
247 struct sigcontext __user *psc;
248 char retcode[8];
249 unsigned long extramask[_NSIG_WORDS-1];
250 struct sigcontext sc;
251};
252
253struct rt_sigframe
254{
255 char __user *pretcode;
256 int sig;
257 struct siginfo __user *pinfo;
258 void __user *puc;
259 char retcode[8];
260 struct siginfo info;
261 struct ucontext uc;
262};
263
264#define FPCONTEXT_SIZE 216
265#define uc_fpstate uc_filler[0]
266#define uc_formatvec uc_filler[FPCONTEXT_SIZE/4]
267#define uc_extra uc_filler[FPCONTEXT_SIZE/4+1]
268
269#ifdef CONFIG_FPU
270
271static unsigned char fpu_version;
272
273static inline int restore_fpu_state(struct sigcontext *sc)
274{
275 int err = 1;
276
277 if (FPU_IS_EMU) {
278
279 memcpy(current->thread.fpcntl, sc->sc_fpcntl, 12);
280 memcpy(current->thread.fp, sc->sc_fpregs, 24);
281 return 0;
282 }
283
284 if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) {
285
286 if (!(CPU_IS_060 || CPU_IS_COLDFIRE) &&
287 (sc->sc_fpstate[0] != fpu_version))
288 goto out;
289 if (CPU_IS_020_OR_030) {
290 if (m68k_fputype & FPU_68881 &&
291 !(sc->sc_fpstate[1] == 0x18 || sc->sc_fpstate[1] == 0xb4))
292 goto out;
293 if (m68k_fputype & FPU_68882 &&
294 !(sc->sc_fpstate[1] == 0x38 || sc->sc_fpstate[1] == 0xd4))
295 goto out;
296 } else if (CPU_IS_040) {
297 if (!(sc->sc_fpstate[1] == 0x00 ||
298 sc->sc_fpstate[1] == 0x28 ||
299 sc->sc_fpstate[1] == 0x60))
300 goto out;
301 } else if (CPU_IS_060) {
302 if (!(sc->sc_fpstate[3] == 0x00 ||
303 sc->sc_fpstate[3] == 0x60 ||
304 sc->sc_fpstate[3] == 0xe0))
305 goto out;
306 } else if (CPU_IS_COLDFIRE) {
307 if (!(sc->sc_fpstate[0] == 0x00 ||
308 sc->sc_fpstate[0] == 0x05 ||
309 sc->sc_fpstate[0] == 0xe5))
310 goto out;
311 } else
312 goto out;
313
314 if (CPU_IS_COLDFIRE) {
315 __asm__ volatile ("fmovemd %0,%%fp0-%%fp1\n\t"
316 "fmovel %1,%%fpcr\n\t"
317 "fmovel %2,%%fpsr\n\t"
318 "fmovel %3,%%fpiar"
319 :
320 : "m" (sc->sc_fpregs[0]),
321 "m" (sc->sc_fpcntl[0]),
322 "m" (sc->sc_fpcntl[1]),
323 "m" (sc->sc_fpcntl[2]));
324 } else {
325 __asm__ volatile (".chip 68k/68881\n\t"
326 "fmovemx %0,%%fp0-%%fp1\n\t"
327 "fmoveml %1,%%fpcr/%%fpsr/%%fpiar\n\t"
328 ".chip 68k"
329 :
330 : "m" (*sc->sc_fpregs),
331 "m" (*sc->sc_fpcntl));
332 }
333 }
334
335 if (CPU_IS_COLDFIRE) {
336 __asm__ volatile ("frestore %0" : : "m" (*sc->sc_fpstate));
337 } else {
338 __asm__ volatile (".chip 68k/68881\n\t"
339 "frestore %0\n\t"
340 ".chip 68k"
341 : : "m" (*sc->sc_fpstate));
342 }
343 err = 0;
344
345out:
346 return err;
347}
348
349static inline int rt_restore_fpu_state(struct ucontext __user *uc)
350{
351 unsigned char fpstate[FPCONTEXT_SIZE];
352 int context_size = CPU_IS_060 ? 8 : (CPU_IS_COLDFIRE ? 12 : 0);
353 fpregset_t fpregs;
354 int err = 1;
355
356 if (FPU_IS_EMU) {
357
358 if (__copy_from_user(current->thread.fpcntl,
359 uc->uc_mcontext.fpregs.f_fpcntl, 12))
360 goto out;
361
362 if (__copy_from_user(current->thread.fp,
363 uc->uc_mcontext.fpregs.f_fpregs, 96))
364 goto out;
365 return 0;
366 }
367
368 if (__get_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate))
369 goto out;
370 if (CPU_IS_060 ? fpstate[2] : fpstate[0]) {
371 if (!(CPU_IS_060 || CPU_IS_COLDFIRE))
372 context_size = fpstate[1];
373
374 if (!(CPU_IS_060 || CPU_IS_COLDFIRE) &&
375 (fpstate[0] != fpu_version))
376 goto out;
377 if (CPU_IS_020_OR_030) {
378 if (m68k_fputype & FPU_68881 &&
379 !(context_size == 0x18 || context_size == 0xb4))
380 goto out;
381 if (m68k_fputype & FPU_68882 &&
382 !(context_size == 0x38 || context_size == 0xd4))
383 goto out;
384 } else if (CPU_IS_040) {
385 if (!(context_size == 0x00 ||
386 context_size == 0x28 ||
387 context_size == 0x60))
388 goto out;
389 } else if (CPU_IS_060) {
390 if (!(fpstate[3] == 0x00 ||
391 fpstate[3] == 0x60 ||
392 fpstate[3] == 0xe0))
393 goto out;
394 } else if (CPU_IS_COLDFIRE) {
395 if (!(fpstate[3] == 0x00 ||
396 fpstate[3] == 0x05 ||
397 fpstate[3] == 0xe5))
398 goto out;
399 } else
400 goto out;
401 if (__copy_from_user(&fpregs, &uc->uc_mcontext.fpregs,
402 sizeof(fpregs)))
403 goto out;
404
405 if (CPU_IS_COLDFIRE) {
406 __asm__ volatile ("fmovemd %0,%%fp0-%%fp7\n\t"
407 "fmovel %1,%%fpcr\n\t"
408 "fmovel %2,%%fpsr\n\t"
409 "fmovel %3,%%fpiar"
410 :
411 : "m" (fpregs.f_fpregs[0]),
412 "m" (fpregs.f_fpcntl[0]),
413 "m" (fpregs.f_fpcntl[1]),
414 "m" (fpregs.f_fpcntl[2]));
415 } else {
416 __asm__ volatile (".chip 68k/68881\n\t"
417 "fmovemx %0,%%fp0-%%fp7\n\t"
418 "fmoveml %1,%%fpcr/%%fpsr/%%fpiar\n\t"
419 ".chip 68k"
420 :
421 : "m" (*fpregs.f_fpregs),
422 "m" (*fpregs.f_fpcntl));
423 }
424 }
425 if (context_size &&
426 __copy_from_user(fpstate + 4, (long __user *)&uc->uc_fpstate + 1,
427 context_size))
428 goto out;
429
430 if (CPU_IS_COLDFIRE) {
431 __asm__ volatile ("frestore %0" : : "m" (*fpstate));
432 } else {
433 __asm__ volatile (".chip 68k/68881\n\t"
434 "frestore %0\n\t"
435 ".chip 68k"
436 : : "m" (*fpstate));
437 }
438 err = 0;
439
440out:
441 return err;
442}
443
444
445
446
447static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs)
448{
449 if (FPU_IS_EMU) {
450
451 memcpy(sc->sc_fpcntl, current->thread.fpcntl, 12);
452 memcpy(sc->sc_fpregs, current->thread.fp, 24);
453 return;
454 }
455
456 if (CPU_IS_COLDFIRE) {
457 __asm__ volatile ("fsave %0"
458 : : "m" (*sc->sc_fpstate) : "memory");
459 } else {
460 __asm__ volatile (".chip 68k/68881\n\t"
461 "fsave %0\n\t"
462 ".chip 68k"
463 : : "m" (*sc->sc_fpstate) : "memory");
464 }
465
466 if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) {
467 fpu_version = sc->sc_fpstate[0];
468 if (CPU_IS_020_OR_030 &&
469 regs->vector >= (VEC_FPBRUC * 4) &&
470 regs->vector <= (VEC_FPNAN * 4)) {
471
472 if (*(unsigned short *) sc->sc_fpstate == 0x1f38)
473 sc->sc_fpstate[0x38] |= 1 << 3;
474 }
475
476 if (CPU_IS_COLDFIRE) {
477 __asm__ volatile ("fmovemd %%fp0-%%fp1,%0\n\t"
478 "fmovel %%fpcr,%1\n\t"
479 "fmovel %%fpsr,%2\n\t"
480 "fmovel %%fpiar,%3"
481 : "=m" (sc->sc_fpregs[0]),
482 "=m" (sc->sc_fpcntl[0]),
483 "=m" (sc->sc_fpcntl[1]),
484 "=m" (sc->sc_fpcntl[2])
485 :
486 : "memory");
487 } else {
488 __asm__ volatile (".chip 68k/68881\n\t"
489 "fmovemx %%fp0-%%fp1,%0\n\t"
490 "fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t"
491 ".chip 68k"
492 : "=m" (*sc->sc_fpregs),
493 "=m" (*sc->sc_fpcntl)
494 :
495 : "memory");
496 }
497 }
498}
499
500static inline int rt_save_fpu_state(struct ucontext __user *uc, struct pt_regs *regs)
501{
502 unsigned char fpstate[FPCONTEXT_SIZE];
503 int context_size = CPU_IS_060 ? 8 : (CPU_IS_COLDFIRE ? 12 : 0);
504 int err = 0;
505
506 if (FPU_IS_EMU) {
507
508 err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpcntl,
509 current->thread.fpcntl, 12);
510
511 err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpregs,
512 current->thread.fp, 96);
513 return err;
514 }
515
516 if (CPU_IS_COLDFIRE) {
517 __asm__ volatile ("fsave %0" : : "m" (*fpstate) : "memory");
518 } else {
519 __asm__ volatile (".chip 68k/68881\n\t"
520 "fsave %0\n\t"
521 ".chip 68k"
522 : : "m" (*fpstate) : "memory");
523 }
524
525 err |= __put_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate);
526 if (CPU_IS_060 ? fpstate[2] : fpstate[0]) {
527 fpregset_t fpregs;
528 if (!(CPU_IS_060 || CPU_IS_COLDFIRE))
529 context_size = fpstate[1];
530 fpu_version = fpstate[0];
531 if (CPU_IS_020_OR_030 &&
532 regs->vector >= (VEC_FPBRUC * 4) &&
533 regs->vector <= (VEC_FPNAN * 4)) {
534
535 if (*(unsigned short *) fpstate == 0x1f38)
536 fpstate[0x38] |= 1 << 3;
537 }
538 if (CPU_IS_COLDFIRE) {
539 __asm__ volatile ("fmovemd %%fp0-%%fp7,%0\n\t"
540 "fmovel %%fpcr,%1\n\t"
541 "fmovel %%fpsr,%2\n\t"
542 "fmovel %%fpiar,%3"
543 : "=m" (fpregs.f_fpregs[0]),
544 "=m" (fpregs.f_fpcntl[0]),
545 "=m" (fpregs.f_fpcntl[1]),
546 "=m" (fpregs.f_fpcntl[2])
547 :
548 : "memory");
549 } else {
550 __asm__ volatile (".chip 68k/68881\n\t"
551 "fmovemx %%fp0-%%fp7,%0\n\t"
552 "fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t"
553 ".chip 68k"
554 : "=m" (*fpregs.f_fpregs),
555 "=m" (*fpregs.f_fpcntl)
556 :
557 : "memory");
558 }
559 err |= copy_to_user(&uc->uc_mcontext.fpregs, &fpregs,
560 sizeof(fpregs));
561 }
562 if (context_size)
563 err |= copy_to_user((long __user *)&uc->uc_fpstate + 1, fpstate + 4,
564 context_size);
565 return err;
566}
567
568#else
569
570
571
572
573static inline int restore_fpu_state(struct sigcontext *sc)
574{
575 return 0;
576}
577
578static inline int rt_restore_fpu_state(struct ucontext __user *uc)
579{
580 return 0;
581}
582
583static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs)
584{
585}
586
587static inline int rt_save_fpu_state(struct ucontext __user *uc, struct pt_regs *regs)
588{
589 return 0;
590}
591
592#endif
593
594static int mangle_kernel_stack(struct pt_regs *regs, int formatvec,
595 void __user *fp)
596{
597 int fsize = frame_extra_sizes(formatvec >> 12);
598 if (fsize < 0) {
599
600
601
602#ifdef DEBUG
603 printk("user process returning with weird frame format\n");
604#endif
605 return 1;
606 }
607 if (!fsize) {
608 regs->format = formatvec >> 12;
609 regs->vector = formatvec & 0xfff;
610 } else {
611 struct switch_stack *sw = (struct switch_stack *)regs - 1;
612 unsigned long buf[fsize / 2];
613
614
615 if (copy_from_user(buf + fsize / 4, fp, fsize))
616 return 1;
617
618
619 regs->format = formatvec >> 12;
620 regs->vector = formatvec & 0xfff;
621#define frame_offset (sizeof(struct pt_regs)+sizeof(struct switch_stack))
622 __asm__ __volatile__ (
623#ifdef CONFIG_COLDFIRE
624 " movel %0,%/sp\n\t"
625 " bra ret_from_signal\n"
626#else
627 " movel %0,%/a0\n\t"
628 " subl %1,%/a0\n\t"
629 " movel %/a0,%/sp\n\t"
630
631 "1: movel %0@+,%/a0@+\n\t"
632 " dbra %2,1b\n\t"
633 " lea %/sp@(%c3),%/a0\n\t"
634 " lsrl #2,%1\n\t"
635 " subql #1,%1\n\t"
636
637 "2: movel %4@+,%/a0@+\n\t"
638 " dbra %1,2b\n\t"
639 " bral ret_from_signal\n"
640#endif
641 :
642 : "a" (sw), "d" (fsize), "d" (frame_offset/4-1),
643 "n" (frame_offset), "a" (buf + fsize/4)
644 : "a0");
645#undef frame_offset
646 }
647 return 0;
648}
649
650static inline int
651restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *usc, void __user *fp)
652{
653 int formatvec;
654 struct sigcontext context;
655 int err = 0;
656
657
658 current->restart_block.fn = do_no_restart_syscall;
659
660
661 if (copy_from_user(&context, usc, sizeof(context)))
662 goto badframe;
663
664
665 regs->d0 = context.sc_d0;
666 regs->d1 = context.sc_d1;
667 regs->a0 = context.sc_a0;
668 regs->a1 = context.sc_a1;
669 regs->sr = (regs->sr & 0xff00) | (context.sc_sr & 0xff);
670 regs->pc = context.sc_pc;
671 regs->orig_d0 = -1;
672 wrusp(context.sc_usp);
673 formatvec = context.sc_formatvec;
674
675 err = restore_fpu_state(&context);
676
677 if (err || mangle_kernel_stack(regs, formatvec, fp))
678 goto badframe;
679
680 return 0;
681
682badframe:
683 return 1;
684}
685
686static inline int
687rt_restore_ucontext(struct pt_regs *regs, struct switch_stack *sw,
688 struct ucontext __user *uc)
689{
690 int temp;
691 greg_t __user *gregs = uc->uc_mcontext.gregs;
692 unsigned long usp;
693 int err;
694
695
696 current->restart_block.fn = do_no_restart_syscall;
697
698 err = __get_user(temp, &uc->uc_mcontext.version);
699 if (temp != MCONTEXT_VERSION)
700 goto badframe;
701
702 err |= __get_user(regs->d0, &gregs[0]);
703 err |= __get_user(regs->d1, &gregs[1]);
704 err |= __get_user(regs->d2, &gregs[2]);
705 err |= __get_user(regs->d3, &gregs[3]);
706 err |= __get_user(regs->d4, &gregs[4]);
707 err |= __get_user(regs->d5, &gregs[5]);
708 err |= __get_user(sw->d6, &gregs[6]);
709 err |= __get_user(sw->d7, &gregs[7]);
710 err |= __get_user(regs->a0, &gregs[8]);
711 err |= __get_user(regs->a1, &gregs[9]);
712 err |= __get_user(regs->a2, &gregs[10]);
713 err |= __get_user(sw->a3, &gregs[11]);
714 err |= __get_user(sw->a4, &gregs[12]);
715 err |= __get_user(sw->a5, &gregs[13]);
716 err |= __get_user(sw->a6, &gregs[14]);
717 err |= __get_user(usp, &gregs[15]);
718 wrusp(usp);
719 err |= __get_user(regs->pc, &gregs[16]);
720 err |= __get_user(temp, &gregs[17]);
721 regs->sr = (regs->sr & 0xff00) | (temp & 0xff);
722 regs->orig_d0 = -1;
723 err |= __get_user(temp, &uc->uc_formatvec);
724
725 err |= rt_restore_fpu_state(uc);
726 err |= restore_altstack(&uc->uc_stack);
727
728 if (err)
729 goto badframe;
730
731 if (mangle_kernel_stack(regs, temp, &uc->uc_extra))
732 goto badframe;
733
734 return 0;
735
736badframe:
737 return 1;
738}
739
740asmlinkage int do_sigreturn(struct pt_regs *regs, struct switch_stack *sw)
741{
742 unsigned long usp = rdusp();
743 struct sigframe __user *frame = (struct sigframe __user *)(usp - 4);
744 sigset_t set;
745
746 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
747 goto badframe;
748 if (__get_user(set.sig[0], &frame->sc.sc_mask) ||
749 (_NSIG_WORDS > 1 &&
750 __copy_from_user(&set.sig[1], &frame->extramask,
751 sizeof(frame->extramask))))
752 goto badframe;
753
754 set_current_blocked(&set);
755
756 if (restore_sigcontext(regs, &frame->sc, frame + 1))
757 goto badframe;
758 return regs->d0;
759
760badframe:
761 force_sig(SIGSEGV, current);
762 return 0;
763}
764
765asmlinkage int do_rt_sigreturn(struct pt_regs *regs, struct switch_stack *sw)
766{
767 unsigned long usp = rdusp();
768 struct rt_sigframe __user *frame = (struct rt_sigframe __user *)(usp - 4);
769 sigset_t set;
770
771 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
772 goto badframe;
773 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
774 goto badframe;
775
776 set_current_blocked(&set);
777
778 if (rt_restore_ucontext(regs, sw, &frame->uc))
779 goto badframe;
780 return regs->d0;
781
782badframe:
783 force_sig(SIGSEGV, current);
784 return 0;
785}
786
787static void setup_sigcontext(struct sigcontext *sc, struct pt_regs *regs,
788 unsigned long mask)
789{
790 sc->sc_mask = mask;
791 sc->sc_usp = rdusp();
792 sc->sc_d0 = regs->d0;
793 sc->sc_d1 = regs->d1;
794 sc->sc_a0 = regs->a0;
795 sc->sc_a1 = regs->a1;
796 sc->sc_sr = regs->sr;
797 sc->sc_pc = regs->pc;
798 sc->sc_formatvec = regs->format << 12 | regs->vector;
799 save_a5_state(sc, regs);
800 save_fpu_state(sc, regs);
801}
802
803static inline int rt_setup_ucontext(struct ucontext __user *uc, struct pt_regs *regs)
804{
805 struct switch_stack *sw = (struct switch_stack *)regs - 1;
806 greg_t __user *gregs = uc->uc_mcontext.gregs;
807 int err = 0;
808
809 err |= __put_user(MCONTEXT_VERSION, &uc->uc_mcontext.version);
810 err |= __put_user(regs->d0, &gregs[0]);
811 err |= __put_user(regs->d1, &gregs[1]);
812 err |= __put_user(regs->d2, &gregs[2]);
813 err |= __put_user(regs->d3, &gregs[3]);
814 err |= __put_user(regs->d4, &gregs[4]);
815 err |= __put_user(regs->d5, &gregs[5]);
816 err |= __put_user(sw->d6, &gregs[6]);
817 err |= __put_user(sw->d7, &gregs[7]);
818 err |= __put_user(regs->a0, &gregs[8]);
819 err |= __put_user(regs->a1, &gregs[9]);
820 err |= __put_user(regs->a2, &gregs[10]);
821 err |= __put_user(sw->a3, &gregs[11]);
822 err |= __put_user(sw->a4, &gregs[12]);
823 err |= __put_user(sw->a5, &gregs[13]);
824 err |= __put_user(sw->a6, &gregs[14]);
825 err |= __put_user(rdusp(), &gregs[15]);
826 err |= __put_user(regs->pc, &gregs[16]);
827 err |= __put_user(regs->sr, &gregs[17]);
828 err |= __put_user((regs->format << 12) | regs->vector, &uc->uc_formatvec);
829 err |= rt_save_fpu_state(uc, regs);
830 return err;
831}
832
833static inline void __user *
834get_sigframe(struct ksignal *ksig, size_t frame_size)
835{
836 unsigned long usp = sigsp(rdusp(), ksig);
837
838 return (void __user *)((usp - frame_size) & -8UL);
839}
840
841static int setup_frame(struct ksignal *ksig, sigset_t *set,
842 struct pt_regs *regs)
843{
844 struct sigframe __user *frame;
845 int fsize = frame_extra_sizes(regs->format);
846 struct sigcontext context;
847 int err = 0, sig = ksig->sig;
848
849 if (fsize < 0) {
850#ifdef DEBUG
851 printk ("setup_frame: Unknown frame format %#x\n",
852 regs->format);
853#endif
854 return -EFAULT;
855 }
856
857 frame = get_sigframe(ksig, sizeof(*frame) + fsize);
858
859 if (fsize)
860 err |= copy_to_user (frame + 1, regs + 1, fsize);
861
862 err |= __put_user(sig, &frame->sig);
863
864 err |= __put_user(regs->vector, &frame->code);
865 err |= __put_user(&frame->sc, &frame->psc);
866
867 if (_NSIG_WORDS > 1)
868 err |= copy_to_user(frame->extramask, &set->sig[1],
869 sizeof(frame->extramask));
870
871 setup_sigcontext(&context, regs, set->sig[0]);
872 err |= copy_to_user (&frame->sc, &context, sizeof(context));
873
874
875#ifdef CONFIG_MMU
876 err |= __put_user(frame->retcode, &frame->pretcode);
877
878 err |= __put_user(0x70004e40 + (__NR_sigreturn << 16),
879 (long __user *)(frame->retcode));
880#else
881 err |= __put_user((void *) ret_from_user_signal, &frame->pretcode);
882#endif
883
884 if (err)
885 return -EFAULT;
886
887 push_cache ((unsigned long) &frame->retcode);
888
889
890
891
892
893 wrusp ((unsigned long) frame);
894 regs->pc = (unsigned long) ksig->ka.sa.sa_handler;
895 adjustformat(regs);
896
897
898
899
900
901
902 if (fsize)
903 regs->stkadj = fsize;
904
905
906 if (regs->stkadj) {
907 struct pt_regs *tregs =
908 (struct pt_regs *)((ulong)regs + regs->stkadj);
909#ifdef DEBUG
910 printk("Performing stackadjust=%04x\n", regs->stkadj);
911#endif
912
913
914 tregs->vector = 0;
915 tregs->format = 0;
916 tregs->pc = regs->pc;
917 tregs->sr = regs->sr;
918 }
919 return 0;
920}
921
922static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
923 struct pt_regs *regs)
924{
925 struct rt_sigframe __user *frame;
926 int fsize = frame_extra_sizes(regs->format);
927 int err = 0, sig = ksig->sig;
928
929 if (fsize < 0) {
930#ifdef DEBUG
931 printk ("setup_frame: Unknown frame format %#x\n",
932 regs->format);
933#endif
934 return -EFAULT;
935 }
936
937 frame = get_sigframe(ksig, sizeof(*frame));
938
939 if (fsize)
940 err |= copy_to_user (&frame->uc.uc_extra, regs + 1, fsize);
941
942 err |= __put_user(sig, &frame->sig);
943 err |= __put_user(&frame->info, &frame->pinfo);
944 err |= __put_user(&frame->uc, &frame->puc);
945 err |= copy_siginfo_to_user(&frame->info, &ksig->info);
946
947
948 err |= __put_user(0, &frame->uc.uc_flags);
949 err |= __put_user(NULL, &frame->uc.uc_link);
950 err |= __save_altstack(&frame->uc.uc_stack, rdusp());
951 err |= rt_setup_ucontext(&frame->uc, regs);
952 err |= copy_to_user (&frame->uc.uc_sigmask, set, sizeof(*set));
953
954
955#ifdef CONFIG_MMU
956 err |= __put_user(frame->retcode, &frame->pretcode);
957#ifdef __mcoldfire__
958
959 err |= __put_user(0x203c0000, (long __user *)(frame->retcode + 0));
960 err |= __put_user(0x00004e40 + (__NR_rt_sigreturn << 16),
961 (long __user *)(frame->retcode + 4));
962#else
963
964 err |= __put_user(0x70004600 + ((__NR_rt_sigreturn ^ 0xff) << 16),
965 (long __user *)(frame->retcode + 0));
966 err |= __put_user(0x4e40, (short __user *)(frame->retcode + 4));
967#endif
968#else
969 err |= __put_user((void *) ret_from_user_rt_signal, &frame->pretcode);
970#endif
971
972 if (err)
973 return -EFAULT;
974
975 push_cache ((unsigned long) &frame->retcode);
976
977
978
979
980
981 wrusp ((unsigned long) frame);
982 regs->pc = (unsigned long) ksig->ka.sa.sa_handler;
983 adjustformat(regs);
984
985
986
987
988
989
990 if (fsize)
991 regs->stkadj = fsize;
992
993
994 if (regs->stkadj) {
995 struct pt_regs *tregs =
996 (struct pt_regs *)((ulong)regs + regs->stkadj);
997#ifdef DEBUG
998 printk("Performing stackadjust=%04x\n", regs->stkadj);
999#endif
1000
1001
1002 tregs->vector = 0;
1003 tregs->format = 0;
1004 tregs->pc = regs->pc;
1005 tregs->sr = regs->sr;
1006 }
1007 return 0;
1008}
1009
1010static inline void
1011handle_restart(struct pt_regs *regs, struct k_sigaction *ka, int has_handler)
1012{
1013 switch (regs->d0) {
1014 case -ERESTARTNOHAND:
1015 if (!has_handler)
1016 goto do_restart;
1017 regs->d0 = -EINTR;
1018 break;
1019
1020 case -ERESTART_RESTARTBLOCK:
1021 if (!has_handler) {
1022 regs->d0 = __NR_restart_syscall;
1023 regs->pc -= 2;
1024 break;
1025 }
1026 regs->d0 = -EINTR;
1027 break;
1028
1029 case -ERESTARTSYS:
1030 if (has_handler && !(ka->sa.sa_flags & SA_RESTART)) {
1031 regs->d0 = -EINTR;
1032 break;
1033 }
1034
1035 case -ERESTARTNOINTR:
1036 do_restart:
1037 regs->d0 = regs->orig_d0;
1038 regs->pc -= 2;
1039 break;
1040 }
1041}
1042
1043
1044
1045
1046static void
1047handle_signal(struct ksignal *ksig, struct pt_regs *regs)
1048{
1049 sigset_t *oldset = sigmask_to_save();
1050 int err;
1051
1052 if (regs->orig_d0 >= 0)
1053
1054 handle_restart(regs, &ksig->ka, 1);
1055
1056
1057 if (ksig->ka.sa.sa_flags & SA_SIGINFO)
1058 err = setup_rt_frame(ksig, oldset, regs);
1059 else
1060 err = setup_frame(ksig, oldset, regs);
1061
1062 signal_setup_done(err, ksig, 0);
1063
1064 if (test_thread_flag(TIF_DELAYED_TRACE)) {
1065 regs->sr &= ~0x8000;
1066 send_sig(SIGTRAP, current, 1);
1067 }
1068}
1069
1070
1071
1072
1073
1074
1075static void do_signal(struct pt_regs *regs)
1076{
1077 struct ksignal ksig;
1078
1079 current->thread.esp0 = (unsigned long) regs;
1080
1081 if (get_signal(&ksig)) {
1082
1083 handle_signal(&ksig, regs);
1084 return;
1085 }
1086
1087
1088 if (regs->orig_d0 >= 0)
1089
1090 handle_restart(regs, NULL, 0);
1091
1092
1093 restore_saved_sigmask();
1094}
1095
1096void do_notify_resume(struct pt_regs *regs)
1097{
1098 if (test_thread_flag(TIF_SIGPENDING))
1099 do_signal(regs);
1100
1101 if (test_and_clear_thread_flag(TIF_NOTIFY_RESUME))
1102 tracehook_notify_resume(regs);
1103}
1104