/arch/powerpc/kernel/signal_32.c
C | 1300 lines | 874 code | 148 blank | 278 comment | 169 complexity | 76094c55d45491cae089916068a94643 MD5 | raw file
Possible License(s): LGPL-2.0, AGPL-1.0, GPL-2.0
1/*
2 * Signal handling for 32bit PPC and 32bit tasks on 64bit PPC
3 *
4 * PowerPC version
5 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
6 * Copyright (C) 2001 IBM
7 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
8 * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
9 *
10 * Derived from "arch/i386/kernel/signal.c"
11 * Copyright (C) 1991, 1992 Linus Torvalds
12 * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson
13 *
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License
16 * as published by the Free Software Foundation; either version
17 * 2 of the License, or (at your option) any later version.
18 */
19
20#include <linux/sched.h>
21#include <linux/mm.h>
22#include <linux/smp.h>
23#include <linux/kernel.h>
24#include <linux/signal.h>
25#include <linux/errno.h>
26#include <linux/elf.h>
27#include <linux/ptrace.h>
28#ifdef CONFIG_PPC64
29#include <linux/syscalls.h>
30#include <linux/compat.h>
31#else
32#include <linux/wait.h>
33#include <linux/unistd.h>
34#include <linux/stddef.h>
35#include <linux/tty.h>
36#include <linux/binfmts.h>
37#include <linux/freezer.h>
38#endif
39
40#include <asm/uaccess.h>
41#include <asm/cacheflush.h>
42#include <asm/syscalls.h>
43#include <asm/sigcontext.h>
44#include <asm/vdso.h>
45#ifdef CONFIG_PPC64
46#include "ppc32.h"
47#include <asm/unistd.h>
48#else
49#include <asm/ucontext.h>
50#include <asm/pgtable.h>
51#endif
52
53#include "signal.h"
54
55#undef DEBUG_SIG
56
57#ifdef CONFIG_PPC64
58#define sys_sigsuspend compat_sys_sigsuspend
59#define sys_rt_sigsuspend compat_sys_rt_sigsuspend
60#define sys_rt_sigreturn compat_sys_rt_sigreturn
61#define sys_sigaction compat_sys_sigaction
62#define sys_swapcontext compat_sys_swapcontext
63#define sys_sigreturn compat_sys_sigreturn
64
65#define old_sigaction old_sigaction32
66#define sigcontext sigcontext32
67#define mcontext mcontext32
68#define ucontext ucontext32
69
70/*
71 * Userspace code may pass a ucontext which doesn't include VSX added
72 * at the end. We need to check for this case.
73 */
74#define UCONTEXTSIZEWITHOUTVSX \
75 (sizeof(struct ucontext) - sizeof(elf_vsrreghalf_t32))
76
77/*
78 * Returning 0 means we return to userspace via
79 * ret_from_except and thus restore all user
80 * registers from *regs. This is what we need
81 * to do when a signal has been delivered.
82 */
83
84#define GP_REGS_SIZE min(sizeof(elf_gregset_t32), sizeof(struct pt_regs32))
85#undef __SIGNAL_FRAMESIZE
86#define __SIGNAL_FRAMESIZE __SIGNAL_FRAMESIZE32
87#undef ELF_NVRREG
88#define ELF_NVRREG ELF_NVRREG32
89
90/*
91 * Functions for flipping sigsets (thanks to brain dead generic
92 * implementation that makes things simple for little endian only)
93 */
94static inline int put_sigset_t(compat_sigset_t __user *uset, sigset_t *set)
95{
96 compat_sigset_t cset;
97
98 switch (_NSIG_WORDS) {
99 case 4: cset.sig[5] = set->sig[3] & 0xffffffffull;
100 cset.sig[7] = set->sig[3] >> 32;
101 case 3: cset.sig[4] = set->sig[2] & 0xffffffffull;
102 cset.sig[5] = set->sig[2] >> 32;
103 case 2: cset.sig[2] = set->sig[1] & 0xffffffffull;
104 cset.sig[3] = set->sig[1] >> 32;
105 case 1: cset.sig[0] = set->sig[0] & 0xffffffffull;
106 cset.sig[1] = set->sig[0] >> 32;
107 }
108 return copy_to_user(uset, &cset, sizeof(*uset));
109}
110
111static inline int get_sigset_t(sigset_t *set,
112 const compat_sigset_t __user *uset)
113{
114 compat_sigset_t s32;
115
116 if (copy_from_user(&s32, uset, sizeof(*uset)))
117 return -EFAULT;
118
119 /*
120 * Swap the 2 words of the 64-bit sigset_t (they are stored
121 * in the "wrong" endian in 32-bit user storage).
122 */
123 switch (_NSIG_WORDS) {
124 case 4: set->sig[3] = s32.sig[6] | (((long)s32.sig[7]) << 32);
125 case 3: set->sig[2] = s32.sig[4] | (((long)s32.sig[5]) << 32);
126 case 2: set->sig[1] = s32.sig[2] | (((long)s32.sig[3]) << 32);
127 case 1: set->sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32);
128 }
129 return 0;
130}
131
132static inline int get_old_sigaction(struct k_sigaction *new_ka,
133 struct old_sigaction __user *act)
134{
135 compat_old_sigset_t mask;
136 compat_uptr_t handler, restorer;
137
138 if (get_user(handler, &act->sa_handler) ||
139 __get_user(restorer, &act->sa_restorer) ||
140 __get_user(new_ka->sa.sa_flags, &act->sa_flags) ||
141 __get_user(mask, &act->sa_mask))
142 return -EFAULT;
143 new_ka->sa.sa_handler = compat_ptr(handler);
144 new_ka->sa.sa_restorer = compat_ptr(restorer);
145 siginitset(&new_ka->sa.sa_mask, mask);
146 return 0;
147}
148
149#define to_user_ptr(p) ptr_to_compat(p)
150#define from_user_ptr(p) compat_ptr(p)
151
152static inline int save_general_regs(struct pt_regs *regs,
153 struct mcontext __user *frame)
154{
155 elf_greg_t64 *gregs = (elf_greg_t64 *)regs;
156 int i;
157
158 WARN_ON(!FULL_REGS(regs));
159
160 for (i = 0; i <= PT_RESULT; i ++) {
161 if (i == 14 && !FULL_REGS(regs))
162 i = 32;
163 if (__put_user((unsigned int)gregs[i], &frame->mc_gregs[i]))
164 return -EFAULT;
165 }
166 return 0;
167}
168
169static inline int restore_general_regs(struct pt_regs *regs,
170 struct mcontext __user *sr)
171{
172 elf_greg_t64 *gregs = (elf_greg_t64 *)regs;
173 int i;
174
175 for (i = 0; i <= PT_RESULT; i++) {
176 if ((i == PT_MSR) || (i == PT_SOFTE))
177 continue;
178 if (__get_user(gregs[i], &sr->mc_gregs[i]))
179 return -EFAULT;
180 }
181 return 0;
182}
183
184#else /* CONFIG_PPC64 */
185
186#define GP_REGS_SIZE min(sizeof(elf_gregset_t), sizeof(struct pt_regs))
187
188static inline int put_sigset_t(sigset_t __user *uset, sigset_t *set)
189{
190 return copy_to_user(uset, set, sizeof(*uset));
191}
192
193static inline int get_sigset_t(sigset_t *set, const sigset_t __user *uset)
194{
195 return copy_from_user(set, uset, sizeof(*uset));
196}
197
198static inline int get_old_sigaction(struct k_sigaction *new_ka,
199 struct old_sigaction __user *act)
200{
201 old_sigset_t mask;
202
203 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
204 __get_user(new_ka->sa.sa_handler, &act->sa_handler) ||
205 __get_user(new_ka->sa.sa_restorer, &act->sa_restorer))
206 return -EFAULT;
207 __get_user(new_ka->sa.sa_flags, &act->sa_flags);
208 __get_user(mask, &act->sa_mask);
209 siginitset(&new_ka->sa.sa_mask, mask);
210 return 0;
211}
212
213#define to_user_ptr(p) ((unsigned long)(p))
214#define from_user_ptr(p) ((void __user *)(p))
215
216static inline int save_general_regs(struct pt_regs *regs,
217 struct mcontext __user *frame)
218{
219 WARN_ON(!FULL_REGS(regs));
220 return __copy_to_user(&frame->mc_gregs, regs, GP_REGS_SIZE);
221}
222
223static inline int restore_general_regs(struct pt_regs *regs,
224 struct mcontext __user *sr)
225{
226 /* copy up to but not including MSR */
227 if (__copy_from_user(regs, &sr->mc_gregs,
228 PT_MSR * sizeof(elf_greg_t)))
229 return -EFAULT;
230 /* copy from orig_r3 (the word after the MSR) up to the end */
231 if (__copy_from_user(®s->orig_gpr3, &sr->mc_gregs[PT_ORIG_R3],
232 GP_REGS_SIZE - PT_ORIG_R3 * sizeof(elf_greg_t)))
233 return -EFAULT;
234 return 0;
235}
236
237#endif /* CONFIG_PPC64 */
238
239/*
240 * Atomically swap in the new signal mask, and wait for a signal.
241 */
242long sys_sigsuspend(old_sigset_t mask)
243{
244 mask &= _BLOCKABLE;
245 spin_lock_irq(¤t->sighand->siglock);
246 current->saved_sigmask = current->blocked;
247 siginitset(¤t->blocked, mask);
248 recalc_sigpending();
249 spin_unlock_irq(¤t->sighand->siglock);
250
251 current->state = TASK_INTERRUPTIBLE;
252 schedule();
253 set_restore_sigmask();
254 return -ERESTARTNOHAND;
255}
256
257long sys_sigaction(int sig, struct old_sigaction __user *act,
258 struct old_sigaction __user *oact)
259{
260 struct k_sigaction new_ka, old_ka;
261 int ret;
262
263#ifdef CONFIG_PPC64
264 if (sig < 0)
265 sig = -sig;
266#endif
267
268 if (act) {
269 if (get_old_sigaction(&new_ka, act))
270 return -EFAULT;
271 }
272
273 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
274 if (!ret && oact) {
275 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
276 __put_user(to_user_ptr(old_ka.sa.sa_handler),
277 &oact->sa_handler) ||
278 __put_user(to_user_ptr(old_ka.sa.sa_restorer),
279 &oact->sa_restorer) ||
280 __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
281 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
282 return -EFAULT;
283 }
284
285 return ret;
286}
287
288/*
289 * When we have signals to deliver, we set up on the
290 * user stack, going down from the original stack pointer:
291 * an ABI gap of 56 words
292 * an mcontext struct
293 * a sigcontext struct
294 * a gap of __SIGNAL_FRAMESIZE bytes
295 *
296 * Each of these things must be a multiple of 16 bytes in size. The following
297 * structure represent all of this except the __SIGNAL_FRAMESIZE gap
298 *
299 */
300struct sigframe {
301 struct sigcontext sctx; /* the sigcontext */
302 struct mcontext mctx; /* all the register values */
303 /*
304 * Programs using the rs6000/xcoff abi can save up to 19 gp
305 * regs and 18 fp regs below sp before decrementing it.
306 */
307 int abigap[56];
308};
309
310/* We use the mc_pad field for the signal return trampoline. */
311#define tramp mc_pad
312
313/*
314 * When we have rt signals to deliver, we set up on the
315 * user stack, going down from the original stack pointer:
316 * one rt_sigframe struct (siginfo + ucontext + ABI gap)
317 * a gap of __SIGNAL_FRAMESIZE+16 bytes
318 * (the +16 is to get the siginfo and ucontext in the same
319 * positions as in older kernels).
320 *
321 * Each of these things must be a multiple of 16 bytes in size.
322 *
323 */
324struct rt_sigframe {
325#ifdef CONFIG_PPC64
326 compat_siginfo_t info;
327#else
328 struct siginfo info;
329#endif
330 struct ucontext uc;
331 /*
332 * Programs using the rs6000/xcoff abi can save up to 19 gp
333 * regs and 18 fp regs below sp before decrementing it.
334 */
335 int abigap[56];
336};
337
338#ifdef CONFIG_VSX
339unsigned long copy_fpr_to_user(void __user *to,
340 struct task_struct *task)
341{
342 double buf[ELF_NFPREG];
343 int i;
344
345 /* save FPR copy to local buffer then write to the thread_struct */
346 for (i = 0; i < (ELF_NFPREG - 1) ; i++)
347 buf[i] = task->thread.TS_FPR(i);
348 memcpy(&buf[i], &task->thread.fpscr, sizeof(double));
349 return __copy_to_user(to, buf, ELF_NFPREG * sizeof(double));
350}
351
352unsigned long copy_fpr_from_user(struct task_struct *task,
353 void __user *from)
354{
355 double buf[ELF_NFPREG];
356 int i;
357
358 if (__copy_from_user(buf, from, ELF_NFPREG * sizeof(double)))
359 return 1;
360 for (i = 0; i < (ELF_NFPREG - 1) ; i++)
361 task->thread.TS_FPR(i) = buf[i];
362 memcpy(&task->thread.fpscr, &buf[i], sizeof(double));
363
364 return 0;
365}
366
367unsigned long copy_vsx_to_user(void __user *to,
368 struct task_struct *task)
369{
370 double buf[ELF_NVSRHALFREG];
371 int i;
372
373 /* save FPR copy to local buffer then write to the thread_struct */
374 for (i = 0; i < ELF_NVSRHALFREG; i++)
375 buf[i] = task->thread.fpr[i][TS_VSRLOWOFFSET];
376 return __copy_to_user(to, buf, ELF_NVSRHALFREG * sizeof(double));
377}
378
379unsigned long copy_vsx_from_user(struct task_struct *task,
380 void __user *from)
381{
382 double buf[ELF_NVSRHALFREG];
383 int i;
384
385 if (__copy_from_user(buf, from, ELF_NVSRHALFREG * sizeof(double)))
386 return 1;
387 for (i = 0; i < ELF_NVSRHALFREG ; i++)
388 task->thread.fpr[i][TS_VSRLOWOFFSET] = buf[i];
389 return 0;
390}
391#else
392inline unsigned long copy_fpr_to_user(void __user *to,
393 struct task_struct *task)
394{
395 return __copy_to_user(to, task->thread.fpr,
396 ELF_NFPREG * sizeof(double));
397}
398
399inline unsigned long copy_fpr_from_user(struct task_struct *task,
400 void __user *from)
401{
402 return __copy_from_user(task->thread.fpr, from,
403 ELF_NFPREG * sizeof(double));
404}
405#endif
406
407/*
408 * Save the current user registers on the user stack.
409 * We only save the altivec/spe registers if the process has used
410 * altivec/spe instructions at some point.
411 */
412static int save_user_regs(struct pt_regs *regs, struct mcontext __user *frame,
413 int sigret, int ctx_has_vsx_region)
414{
415 unsigned long msr = regs->msr;
416
417 /* Make sure floating point registers are stored in regs */
418 flush_fp_to_thread(current);
419
420 /* save general registers */
421 if (save_general_regs(regs, frame))
422 return 1;
423
424#ifdef CONFIG_ALTIVEC
425 /* save altivec registers */
426 if (current->thread.used_vr) {
427 flush_altivec_to_thread(current);
428 if (__copy_to_user(&frame->mc_vregs, current->thread.vr,
429 ELF_NVRREG * sizeof(vector128)))
430 return 1;
431 /* set MSR_VEC in the saved MSR value to indicate that
432 frame->mc_vregs contains valid data */
433 msr |= MSR_VEC;
434 }
435 /* else assert((regs->msr & MSR_VEC) == 0) */
436
437 /* We always copy to/from vrsave, it's 0 if we don't have or don't
438 * use altivec. Since VSCR only contains 32 bits saved in the least
439 * significant bits of a vector, we "cheat" and stuff VRSAVE in the
440 * most significant bits of that same vector. --BenH
441 */
442 if (__put_user(current->thread.vrsave, (u32 __user *)&frame->mc_vregs[32]))
443 return 1;
444#endif /* CONFIG_ALTIVEC */
445 if (copy_fpr_to_user(&frame->mc_fregs, current))
446 return 1;
447#ifdef CONFIG_VSX
448 /*
449 * Copy VSR 0-31 upper half from thread_struct to local
450 * buffer, then write that to userspace. Also set MSR_VSX in
451 * the saved MSR value to indicate that frame->mc_vregs
452 * contains valid data
453 */
454 if (current->thread.used_vsr && ctx_has_vsx_region) {
455 __giveup_vsx(current);
456 if (copy_vsx_to_user(&frame->mc_vsregs, current))
457 return 1;
458 msr |= MSR_VSX;
459 }
460#endif /* CONFIG_VSX */
461#ifdef CONFIG_SPE
462 /* save spe registers */
463 if (current->thread.used_spe) {
464 flush_spe_to_thread(current);
465 if (__copy_to_user(&frame->mc_vregs, current->thread.evr,
466 ELF_NEVRREG * sizeof(u32)))
467 return 1;
468 /* set MSR_SPE in the saved MSR value to indicate that
469 frame->mc_vregs contains valid data */
470 msr |= MSR_SPE;
471 }
472 /* else assert((regs->msr & MSR_SPE) == 0) */
473
474 /* We always copy to/from spefscr */
475 if (__put_user(current->thread.spefscr, (u32 __user *)&frame->mc_vregs + ELF_NEVRREG))
476 return 1;
477#endif /* CONFIG_SPE */
478
479 if (__put_user(msr, &frame->mc_gregs[PT_MSR]))
480 return 1;
481 if (sigret) {
482 /* Set up the sigreturn trampoline: li r0,sigret; sc */
483 if (__put_user(0x38000000UL + sigret, &frame->tramp[0])
484 || __put_user(0x44000002UL, &frame->tramp[1]))
485 return 1;
486 flush_icache_range((unsigned long) &frame->tramp[0],
487 (unsigned long) &frame->tramp[2]);
488 }
489
490 return 0;
491}
492
493/*
494 * Restore the current user register values from the user stack,
495 * (except for MSR).
496 */
497static long restore_user_regs(struct pt_regs *regs,
498 struct mcontext __user *sr, int sig)
499{
500 long err;
501 unsigned int save_r2 = 0;
502 unsigned long msr;
503#ifdef CONFIG_VSX
504 int i;
505#endif
506
507 /*
508 * restore general registers but not including MSR or SOFTE. Also
509 * take care of keeping r2 (TLS) intact if not a signal
510 */
511 if (!sig)
512 save_r2 = (unsigned int)regs->gpr[2];
513 err = restore_general_regs(regs, sr);
514 err |= __get_user(msr, &sr->mc_gregs[PT_MSR]);
515 if (!sig)
516 regs->gpr[2] = (unsigned long) save_r2;
517 if (err)
518 return 1;
519
520 /* if doing signal return, restore the previous little-endian mode */
521 if (sig)
522 regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE);
523
524 /*
525 * Do this before updating the thread state in
526 * current->thread.fpr/vr/evr. That way, if we get preempted
527 * and another task grabs the FPU/Altivec/SPE, it won't be
528 * tempted to save the current CPU state into the thread_struct
529 * and corrupt what we are writing there.
530 */
531 discard_lazy_cpu_state();
532
533#ifdef CONFIG_ALTIVEC
534 /*
535 * Force the process to reload the altivec registers from
536 * current->thread when it next does altivec instructions
537 */
538 regs->msr &= ~MSR_VEC;
539 if (msr & MSR_VEC) {
540 /* restore altivec registers from the stack */
541 if (__copy_from_user(current->thread.vr, &sr->mc_vregs,
542 sizeof(sr->mc_vregs)))
543 return 1;
544 } else if (current->thread.used_vr)
545 memset(current->thread.vr, 0, ELF_NVRREG * sizeof(vector128));
546
547 /* Always get VRSAVE back */
548 if (__get_user(current->thread.vrsave, (u32 __user *)&sr->mc_vregs[32]))
549 return 1;
550#endif /* CONFIG_ALTIVEC */
551 if (copy_fpr_from_user(current, &sr->mc_fregs))
552 return 1;
553
554#ifdef CONFIG_VSX
555 /*
556 * Force the process to reload the VSX registers from
557 * current->thread when it next does VSX instruction.
558 */
559 regs->msr &= ~MSR_VSX;
560 if (msr & MSR_VSX) {
561 /*
562 * Restore altivec registers from the stack to a local
563 * buffer, then write this out to the thread_struct
564 */
565 if (copy_vsx_from_user(current, &sr->mc_vsregs))
566 return 1;
567 } else if (current->thread.used_vsr)
568 for (i = 0; i < 32 ; i++)
569 current->thread.fpr[i][TS_VSRLOWOFFSET] = 0;
570#endif /* CONFIG_VSX */
571 /*
572 * force the process to reload the FP registers from
573 * current->thread when it next does FP instructions
574 */
575 regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1);
576
577#ifdef CONFIG_SPE
578 /* force the process to reload the spe registers from
579 current->thread when it next does spe instructions */
580 regs->msr &= ~MSR_SPE;
581 if (msr & MSR_SPE) {
582 /* restore spe registers from the stack */
583 if (__copy_from_user(current->thread.evr, &sr->mc_vregs,
584 ELF_NEVRREG * sizeof(u32)))
585 return 1;
586 } else if (current->thread.used_spe)
587 memset(current->thread.evr, 0, ELF_NEVRREG * sizeof(u32));
588
589 /* Always get SPEFSCR back */
590 if (__get_user(current->thread.spefscr, (u32 __user *)&sr->mc_vregs + ELF_NEVRREG))
591 return 1;
592#endif /* CONFIG_SPE */
593
594 return 0;
595}
596
597#ifdef CONFIG_PPC64
598long compat_sys_rt_sigaction(int sig, const struct sigaction32 __user *act,
599 struct sigaction32 __user *oact, size_t sigsetsize)
600{
601 struct k_sigaction new_ka, old_ka;
602 int ret;
603
604 /* XXX: Don't preclude handling different sized sigset_t's. */
605 if (sigsetsize != sizeof(compat_sigset_t))
606 return -EINVAL;
607
608 if (act) {
609 compat_uptr_t handler;
610
611 ret = get_user(handler, &act->sa_handler);
612 new_ka.sa.sa_handler = compat_ptr(handler);
613 ret |= get_sigset_t(&new_ka.sa.sa_mask, &act->sa_mask);
614 ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
615 if (ret)
616 return -EFAULT;
617 }
618
619 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
620 if (!ret && oact) {
621 ret = put_user(to_user_ptr(old_ka.sa.sa_handler), &oact->sa_handler);
622 ret |= put_sigset_t(&oact->sa_mask, &old_ka.sa.sa_mask);
623 ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
624 }
625 return ret;
626}
627
628/*
629 * Note: it is necessary to treat how as an unsigned int, with the
630 * corresponding cast to a signed int to insure that the proper
631 * conversion (sign extension) between the register representation
632 * of a signed int (msr in 32-bit mode) and the register representation
633 * of a signed int (msr in 64-bit mode) is performed.
634 */
635long compat_sys_rt_sigprocmask(u32 how, compat_sigset_t __user *set,
636 compat_sigset_t __user *oset, size_t sigsetsize)
637{
638 sigset_t s;
639 sigset_t __user *up;
640 int ret;
641 mm_segment_t old_fs = get_fs();
642
643 if (set) {
644 if (get_sigset_t(&s, set))
645 return -EFAULT;
646 }
647
648 set_fs(KERNEL_DS);
649 /* This is valid because of the set_fs() */
650 up = (sigset_t __user *) &s;
651 ret = sys_rt_sigprocmask((int)how, set ? up : NULL, oset ? up : NULL,
652 sigsetsize);
653 set_fs(old_fs);
654 if (ret)
655 return ret;
656 if (oset) {
657 if (put_sigset_t(oset, &s))
658 return -EFAULT;
659 }
660 return 0;
661}
662
663long compat_sys_rt_sigpending(compat_sigset_t __user *set, compat_size_t sigsetsize)
664{
665 sigset_t s;
666 int ret;
667 mm_segment_t old_fs = get_fs();
668
669 set_fs(KERNEL_DS);
670 /* The __user pointer cast is valid because of the set_fs() */
671 ret = sys_rt_sigpending((sigset_t __user *) &s, sigsetsize);
672 set_fs(old_fs);
673 if (!ret) {
674 if (put_sigset_t(set, &s))
675 return -EFAULT;
676 }
677 return ret;
678}
679
680
681int copy_siginfo_to_user32(struct compat_siginfo __user *d, siginfo_t *s)
682{
683 int err;
684
685 if (!access_ok (VERIFY_WRITE, d, sizeof(*d)))
686 return -EFAULT;
687
688 /* If you change siginfo_t structure, please be sure
689 * this code is fixed accordingly.
690 * It should never copy any pad contained in the structure
691 * to avoid security leaks, but must copy the generic
692 * 3 ints plus the relevant union member.
693 * This routine must convert siginfo from 64bit to 32bit as well
694 * at the same time.
695 */
696 err = __put_user(s->si_signo, &d->si_signo);
697 err |= __put_user(s->si_errno, &d->si_errno);
698 err |= __put_user((short)s->si_code, &d->si_code);
699 if (s->si_code < 0)
700 err |= __copy_to_user(&d->_sifields._pad, &s->_sifields._pad,
701 SI_PAD_SIZE32);
702 else switch(s->si_code >> 16) {
703 case __SI_CHLD >> 16:
704 err |= __put_user(s->si_pid, &d->si_pid);
705 err |= __put_user(s->si_uid, &d->si_uid);
706 err |= __put_user(s->si_utime, &d->si_utime);
707 err |= __put_user(s->si_stime, &d->si_stime);
708 err |= __put_user(s->si_status, &d->si_status);
709 break;
710 case __SI_FAULT >> 16:
711 err |= __put_user((unsigned int)(unsigned long)s->si_addr,
712 &d->si_addr);
713 break;
714 case __SI_POLL >> 16:
715 err |= __put_user(s->si_band, &d->si_band);
716 err |= __put_user(s->si_fd, &d->si_fd);
717 break;
718 case __SI_TIMER >> 16:
719 err |= __put_user(s->si_tid, &d->si_tid);
720 err |= __put_user(s->si_overrun, &d->si_overrun);
721 err |= __put_user(s->si_int, &d->si_int);
722 break;
723 case __SI_RT >> 16: /* This is not generated by the kernel as of now. */
724 case __SI_MESGQ >> 16:
725 err |= __put_user(s->si_int, &d->si_int);
726 /* fallthrough */
727 case __SI_KILL >> 16:
728 default:
729 err |= __put_user(s->si_pid, &d->si_pid);
730 err |= __put_user(s->si_uid, &d->si_uid);
731 break;
732 }
733 return err;
734}
735
736#define copy_siginfo_to_user copy_siginfo_to_user32
737
738int copy_siginfo_from_user32(siginfo_t *to, struct compat_siginfo __user *from)
739{
740 memset(to, 0, sizeof *to);
741
742 if (copy_from_user(to, from, 3*sizeof(int)) ||
743 copy_from_user(to->_sifields._pad,
744 from->_sifields._pad, SI_PAD_SIZE32))
745 return -EFAULT;
746
747 return 0;
748}
749
750/*
751 * Note: it is necessary to treat pid and sig as unsigned ints, with the
752 * corresponding cast to a signed int to insure that the proper conversion
753 * (sign extension) between the register representation of a signed int
754 * (msr in 32-bit mode) and the register representation of a signed int
755 * (msr in 64-bit mode) is performed.
756 */
757long compat_sys_rt_sigqueueinfo(u32 pid, u32 sig, compat_siginfo_t __user *uinfo)
758{
759 siginfo_t info;
760 int ret;
761 mm_segment_t old_fs = get_fs();
762
763 ret = copy_siginfo_from_user32(&info, uinfo);
764 if (unlikely(ret))
765 return ret;
766
767 set_fs (KERNEL_DS);
768 /* The __user pointer cast is valid becasuse of the set_fs() */
769 ret = sys_rt_sigqueueinfo((int)pid, (int)sig, (siginfo_t __user *) &info);
770 set_fs (old_fs);
771 return ret;
772}
773/*
774 * Start Alternate signal stack support
775 *
776 * System Calls
777 * sigaltatck compat_sys_sigaltstack
778 */
779
780int compat_sys_sigaltstack(u32 __new, u32 __old, int r5,
781 int r6, int r7, int r8, struct pt_regs *regs)
782{
783 stack_32_t __user * newstack = compat_ptr(__new);
784 stack_32_t __user * oldstack = compat_ptr(__old);
785 stack_t uss, uoss;
786 int ret;
787 mm_segment_t old_fs;
788 unsigned long sp;
789 compat_uptr_t ss_sp;
790
791 /*
792 * set sp to the user stack on entry to the system call
793 * the system call router sets R9 to the saved registers
794 */
795 sp = regs->gpr[1];
796
797 /* Put new stack info in local 64 bit stack struct */
798 if (newstack) {
799 if (get_user(ss_sp, &newstack->ss_sp) ||
800 __get_user(uss.ss_flags, &newstack->ss_flags) ||
801 __get_user(uss.ss_size, &newstack->ss_size))
802 return -EFAULT;
803 uss.ss_sp = compat_ptr(ss_sp);
804 }
805
806 old_fs = get_fs();
807 set_fs(KERNEL_DS);
808 /* The __user pointer casts are valid because of the set_fs() */
809 ret = do_sigaltstack(
810 newstack ? (stack_t __user *) &uss : NULL,
811 oldstack ? (stack_t __user *) &uoss : NULL,
812 sp);
813 set_fs(old_fs);
814 /* Copy the stack information to the user output buffer */
815 if (!ret && oldstack &&
816 (put_user(ptr_to_compat(uoss.ss_sp), &oldstack->ss_sp) ||
817 __put_user(uoss.ss_flags, &oldstack->ss_flags) ||
818 __put_user(uoss.ss_size, &oldstack->ss_size)))
819 return -EFAULT;
820 return ret;
821}
822#endif /* CONFIG_PPC64 */
823
824/*
825 * Set up a signal frame for a "real-time" signal handler
826 * (one which gets siginfo).
827 */
828int handle_rt_signal32(unsigned long sig, struct k_sigaction *ka,
829 siginfo_t *info, sigset_t *oldset,
830 struct pt_regs *regs)
831{
832 struct rt_sigframe __user *rt_sf;
833 struct mcontext __user *frame;
834 void __user *addr;
835 unsigned long newsp = 0;
836
837 /* Set up Signal Frame */
838 /* Put a Real Time Context onto stack */
839 rt_sf = get_sigframe(ka, regs, sizeof(*rt_sf), 1);
840 addr = rt_sf;
841 if (unlikely(rt_sf == NULL))
842 goto badframe;
843
844 /* Put the siginfo & fill in most of the ucontext */
845 if (copy_siginfo_to_user(&rt_sf->info, info)
846 || __put_user(0, &rt_sf->uc.uc_flags)
847 || __put_user(0, &rt_sf->uc.uc_link)
848 || __put_user(current->sas_ss_sp, &rt_sf->uc.uc_stack.ss_sp)
849 || __put_user(sas_ss_flags(regs->gpr[1]),
850 &rt_sf->uc.uc_stack.ss_flags)
851 || __put_user(current->sas_ss_size, &rt_sf->uc.uc_stack.ss_size)
852 || __put_user(to_user_ptr(&rt_sf->uc.uc_mcontext),
853 &rt_sf->uc.uc_regs)
854 || put_sigset_t(&rt_sf->uc.uc_sigmask, oldset))
855 goto badframe;
856
857 /* Save user registers on the stack */
858 frame = &rt_sf->uc.uc_mcontext;
859 addr = frame;
860 if (vdso32_rt_sigtramp && current->mm->context.vdso_base) {
861 if (save_user_regs(regs, frame, 0, 1))
862 goto badframe;
863 regs->link = current->mm->context.vdso_base + vdso32_rt_sigtramp;
864 } else {
865 if (save_user_regs(regs, frame, __NR_rt_sigreturn, 1))
866 goto badframe;
867 regs->link = (unsigned long) frame->tramp;
868 }
869
870 current->thread.fpscr.val = 0; /* turn off all fp exceptions */
871
872 /* create a stack frame for the caller of the handler */
873 newsp = ((unsigned long)rt_sf) - (__SIGNAL_FRAMESIZE + 16);
874 addr = (void __user *)regs->gpr[1];
875 if (put_user(regs->gpr[1], (u32 __user *)newsp))
876 goto badframe;
877
878 /* Fill registers for signal handler */
879 regs->gpr[1] = newsp;
880 regs->gpr[3] = sig;
881 regs->gpr[4] = (unsigned long) &rt_sf->info;
882 regs->gpr[5] = (unsigned long) &rt_sf->uc;
883 regs->gpr[6] = (unsigned long) rt_sf;
884 regs->nip = (unsigned long) ka->sa.sa_handler;
885 /* enter the signal handler in big-endian mode */
886 regs->msr &= ~MSR_LE;
887 regs->trap = 0;
888 return 1;
889
890badframe:
891#ifdef DEBUG_SIG
892 printk("badframe in handle_rt_signal, regs=%p frame=%p newsp=%lx\n",
893 regs, frame, newsp);
894#endif
895 if (show_unhandled_signals && printk_ratelimit())
896 printk(KERN_INFO "%s[%d]: bad frame in handle_rt_signal32: "
897 "%p nip %08lx lr %08lx\n",
898 current->comm, current->pid,
899 addr, regs->nip, regs->link);
900
901 force_sigsegv(sig, current);
902 return 0;
903}
904
905static int do_setcontext(struct ucontext __user *ucp, struct pt_regs *regs, int sig)
906{
907 sigset_t set;
908 struct mcontext __user *mcp;
909
910 if (get_sigset_t(&set, &ucp->uc_sigmask))
911 return -EFAULT;
912#ifdef CONFIG_PPC64
913 {
914 u32 cmcp;
915
916 if (__get_user(cmcp, &ucp->uc_regs))
917 return -EFAULT;
918 mcp = (struct mcontext __user *)(u64)cmcp;
919 /* no need to check access_ok(mcp), since mcp < 4GB */
920 }
921#else
922 if (__get_user(mcp, &ucp->uc_regs))
923 return -EFAULT;
924 if (!access_ok(VERIFY_READ, mcp, sizeof(*mcp)))
925 return -EFAULT;
926#endif
927 restore_sigmask(&set);
928 if (restore_user_regs(regs, mcp, sig))
929 return -EFAULT;
930
931 return 0;
932}
933
934long sys_swapcontext(struct ucontext __user *old_ctx,
935 struct ucontext __user *new_ctx,
936 int ctx_size, int r6, int r7, int r8, struct pt_regs *regs)
937{
938 unsigned char tmp;
939 int ctx_has_vsx_region = 0;
940
941#ifdef CONFIG_PPC64
942 unsigned long new_msr = 0;
943
944 if (new_ctx) {
945 struct mcontext __user *mcp;
946 u32 cmcp;
947
948 /*
949 * Get pointer to the real mcontext. No need for
950 * access_ok since we are dealing with compat
951 * pointers.
952 */
953 if (__get_user(cmcp, &new_ctx->uc_regs))
954 return -EFAULT;
955 mcp = (struct mcontext __user *)(u64)cmcp;
956 if (__get_user(new_msr, &mcp->mc_gregs[PT_MSR]))
957 return -EFAULT;
958 }
959 /*
960 * Check that the context is not smaller than the original
961 * size (with VMX but without VSX)
962 */
963 if (ctx_size < UCONTEXTSIZEWITHOUTVSX)
964 return -EINVAL;
965 /*
966 * If the new context state sets the MSR VSX bits but
967 * it doesn't provide VSX state.
968 */
969 if ((ctx_size < sizeof(struct ucontext)) &&
970 (new_msr & MSR_VSX))
971 return -EINVAL;
972 /* Does the context have enough room to store VSX data? */
973 if (ctx_size >= sizeof(struct ucontext))
974 ctx_has_vsx_region = 1;
975#else
976 /* Context size is for future use. Right now, we only make sure
977 * we are passed something we understand
978 */
979 if (ctx_size < sizeof(struct ucontext))
980 return -EINVAL;
981#endif
982 if (old_ctx != NULL) {
983 struct mcontext __user *mctx;
984
985 /*
986 * old_ctx might not be 16-byte aligned, in which
987 * case old_ctx->uc_mcontext won't be either.
988 * Because we have the old_ctx->uc_pad2 field
989 * before old_ctx->uc_mcontext, we need to round down
990 * from &old_ctx->uc_mcontext to a 16-byte boundary.
991 */
992 mctx = (struct mcontext __user *)
993 ((unsigned long) &old_ctx->uc_mcontext & ~0xfUL);
994 if (!access_ok(VERIFY_WRITE, old_ctx, ctx_size)
995 || save_user_regs(regs, mctx, 0, ctx_has_vsx_region)
996 || put_sigset_t(&old_ctx->uc_sigmask, ¤t->blocked)
997 || __put_user(to_user_ptr(mctx), &old_ctx->uc_regs))
998 return -EFAULT;
999 }
1000 if (new_ctx == NULL)
1001 return 0;
1002 if (!access_ok(VERIFY_READ, new_ctx, ctx_size)
1003 || __get_user(tmp, (u8 __user *) new_ctx)
1004 || __get_user(tmp, (u8 __user *) new_ctx + ctx_size - 1))
1005 return -EFAULT;
1006
1007 /*
1008 * If we get a fault copying the context into the kernel's
1009 * image of the user's registers, we can't just return -EFAULT
1010 * because the user's registers will be corrupted. For instance
1011 * the NIP value may have been updated but not some of the
1012 * other registers. Given that we have done the access_ok
1013 * and successfully read the first and last bytes of the region
1014 * above, this should only happen in an out-of-memory situation
1015 * or if another thread unmaps the region containing the context.
1016 * We kill the task with a SIGSEGV in this situation.
1017 */
1018 if (do_setcontext(new_ctx, regs, 0))
1019 do_exit(SIGSEGV);
1020
1021 set_thread_flag(TIF_RESTOREALL);
1022 return 0;
1023}
1024
1025long sys_rt_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8,
1026 struct pt_regs *regs)
1027{
1028 struct rt_sigframe __user *rt_sf;
1029
1030 /* Always make any pending restarted system calls return -EINTR */
1031 current_thread_info()->restart_block.fn = do_no_restart_syscall;
1032
1033 rt_sf = (struct rt_sigframe __user *)
1034 (regs->gpr[1] + __SIGNAL_FRAMESIZE + 16);
1035 if (!access_ok(VERIFY_READ, rt_sf, sizeof(*rt_sf)))
1036 goto bad;
1037 if (do_setcontext(&rt_sf->uc, regs, 1))
1038 goto bad;
1039
1040 /*
1041 * It's not clear whether or why it is desirable to save the
1042 * sigaltstack setting on signal delivery and restore it on
1043 * signal return. But other architectures do this and we have
1044 * always done it up until now so it is probably better not to
1045 * change it. -- paulus
1046 */
1047#ifdef CONFIG_PPC64
1048 /*
1049 * We use the compat_sys_ version that does the 32/64 bits conversion
1050 * and takes userland pointer directly. What about error checking ?
1051 * nobody does any...
1052 */
1053 compat_sys_sigaltstack((u32)(u64)&rt_sf->uc.uc_stack, 0, 0, 0, 0, 0, regs);
1054#else
1055 do_sigaltstack(&rt_sf->uc.uc_stack, NULL, regs->gpr[1]);
1056#endif
1057 set_thread_flag(TIF_RESTOREALL);
1058 return 0;
1059
1060 bad:
1061 if (show_unhandled_signals && printk_ratelimit())
1062 printk(KERN_INFO "%s[%d]: bad frame in sys_rt_sigreturn: "
1063 "%p nip %08lx lr %08lx\n",
1064 current->comm, current->pid,
1065 rt_sf, regs->nip, regs->link);
1066
1067 force_sig(SIGSEGV, current);
1068 return 0;
1069}
1070
1071#ifdef CONFIG_PPC32
1072int sys_debug_setcontext(struct ucontext __user *ctx,
1073 int ndbg, struct sig_dbg_op __user *dbg,
1074 int r6, int r7, int r8,
1075 struct pt_regs *regs)
1076{
1077 struct sig_dbg_op op;
1078 int i;
1079 unsigned char tmp;
1080 unsigned long new_msr = regs->msr;
1081#ifdef CONFIG_PPC_ADV_DEBUG_REGS
1082 unsigned long new_dbcr0 = current->thread.dbcr0;
1083#endif
1084
1085 for (i=0; i<ndbg; i++) {
1086 if (copy_from_user(&op, dbg + i, sizeof(op)))
1087 return -EFAULT;
1088 switch (op.dbg_type) {
1089 case SIG_DBG_SINGLE_STEPPING:
1090#ifdef CONFIG_PPC_ADV_DEBUG_REGS
1091 if (op.dbg_value) {
1092 new_msr |= MSR_DE;
1093 new_dbcr0 |= (DBCR0_IDM | DBCR0_IC);
1094 } else {
1095 new_dbcr0 &= ~DBCR0_IC;
1096 if (!DBCR_ACTIVE_EVENTS(new_dbcr0,
1097 current->thread.dbcr1)) {
1098 new_msr &= ~MSR_DE;
1099 new_dbcr0 &= ~DBCR0_IDM;
1100 }
1101 }
1102#else
1103 if (op.dbg_value)
1104 new_msr |= MSR_SE;
1105 else
1106 new_msr &= ~MSR_SE;
1107#endif
1108 break;
1109 case SIG_DBG_BRANCH_TRACING:
1110#ifdef CONFIG_PPC_ADV_DEBUG_REGS
1111 return -EINVAL;
1112#else
1113 if (op.dbg_value)
1114 new_msr |= MSR_BE;
1115 else
1116 new_msr &= ~MSR_BE;
1117#endif
1118 break;
1119
1120 default:
1121 return -EINVAL;
1122 }
1123 }
1124
1125 /* We wait until here to actually install the values in the
1126 registers so if we fail in the above loop, it will not
1127 affect the contents of these registers. After this point,
1128 failure is a problem, anyway, and it's very unlikely unless
1129 the user is really doing something wrong. */
1130 regs->msr = new_msr;
1131#ifdef CONFIG_PPC_ADV_DEBUG_REGS
1132 current->thread.dbcr0 = new_dbcr0;
1133#endif
1134
1135 if (!access_ok(VERIFY_READ, ctx, sizeof(*ctx))
1136 || __get_user(tmp, (u8 __user *) ctx)
1137 || __get_user(tmp, (u8 __user *) (ctx + 1) - 1))
1138 return -EFAULT;
1139
1140 /*
1141 * If we get a fault copying the context into the kernel's
1142 * image of the user's registers, we can't just return -EFAULT
1143 * because the user's registers will be corrupted. For instance
1144 * the NIP value may have been updated but not some of the
1145 * other registers. Given that we have done the access_ok
1146 * and successfully read the first and last bytes of the region
1147 * above, this should only happen in an out-of-memory situation
1148 * or if another thread unmaps the region containing the context.
1149 * We kill the task with a SIGSEGV in this situation.
1150 */
1151 if (do_setcontext(ctx, regs, 1)) {
1152 if (show_unhandled_signals && printk_ratelimit())
1153 printk(KERN_INFO "%s[%d]: bad frame in "
1154 "sys_debug_setcontext: %p nip %08lx "
1155 "lr %08lx\n",
1156 current->comm, current->pid,
1157 ctx, regs->nip, regs->link);
1158
1159 force_sig(SIGSEGV, current);
1160 goto out;
1161 }
1162
1163 /*
1164 * It's not clear whether or why it is desirable to save the
1165 * sigaltstack setting on signal delivery and restore it on
1166 * signal return. But other architectures do this and we have
1167 * always done it up until now so it is probably better not to
1168 * change it. -- paulus
1169 */
1170 do_sigaltstack(&ctx->uc_stack, NULL, regs->gpr[1]);
1171
1172 set_thread_flag(TIF_RESTOREALL);
1173 out:
1174 return 0;
1175}
1176#endif
1177
1178/*
1179 * OK, we're invoking a handler
1180 */
1181int handle_signal32(unsigned long sig, struct k_sigaction *ka,
1182 siginfo_t *info, sigset_t *oldset, struct pt_regs *regs)
1183{
1184 struct sigcontext __user *sc;
1185 struct sigframe __user *frame;
1186 unsigned long newsp = 0;
1187
1188 /* Set up Signal Frame */
1189 frame = get_sigframe(ka, regs, sizeof(*frame), 1);
1190 if (unlikely(frame == NULL))
1191 goto badframe;
1192 sc = (struct sigcontext __user *) &frame->sctx;
1193
1194#if _NSIG != 64
1195#error "Please adjust handle_signal()"
1196#endif
1197 if (__put_user(to_user_ptr(ka->sa.sa_handler), &sc->handler)
1198 || __put_user(oldset->sig[0], &sc->oldmask)
1199#ifdef CONFIG_PPC64
1200 || __put_user((oldset->sig[0] >> 32), &sc->_unused[3])
1201#else
1202 || __put_user(oldset->sig[1], &sc->_unused[3])
1203#endif
1204 || __put_user(to_user_ptr(&frame->mctx), &sc->regs)
1205 || __put_user(sig, &sc->signal))
1206 goto badframe;
1207
1208 if (vdso32_sigtramp && current->mm->context.vdso_base) {
1209 if (save_user_regs(regs, &frame->mctx, 0, 1))
1210 goto badframe;
1211 regs->link = current->mm->context.vdso_base + vdso32_sigtramp;
1212 } else {
1213 if (save_user_regs(regs, &frame->mctx, __NR_sigreturn, 1))
1214 goto badframe;
1215 regs->link = (unsigned long) frame->mctx.tramp;
1216 }
1217
1218 current->thread.fpscr.val = 0; /* turn off all fp exceptions */
1219
1220 /* create a stack frame for the caller of the handler */
1221 newsp = ((unsigned long)frame) - __SIGNAL_FRAMESIZE;
1222 if (put_user(regs->gpr[1], (u32 __user *)newsp))
1223 goto badframe;
1224
1225 regs->gpr[1] = newsp;
1226 regs->gpr[3] = sig;
1227 regs->gpr[4] = (unsigned long) sc;
1228 regs->nip = (unsigned long) ka->sa.sa_handler;
1229 /* enter the signal handler in big-endian mode */
1230 regs->msr &= ~MSR_LE;
1231 regs->trap = 0;
1232
1233 return 1;
1234
1235badframe:
1236#ifdef DEBUG_SIG
1237 printk("badframe in handle_signal, regs=%p frame=%p newsp=%lx\n",
1238 regs, frame, newsp);
1239#endif
1240 if (show_unhandled_signals && printk_ratelimit())
1241 printk(KERN_INFO "%s[%d]: bad frame in handle_signal32: "
1242 "%p nip %08lx lr %08lx\n",
1243 current->comm, current->pid,
1244 frame, regs->nip, regs->link);
1245
1246 force_sigsegv(sig, current);
1247 return 0;
1248}
1249
1250/*
1251 * Do a signal return; undo the signal stack.
1252 */
1253long sys_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8,
1254 struct pt_regs *regs)
1255{
1256 struct sigcontext __user *sc;
1257 struct sigcontext sigctx;
1258 struct mcontext __user *sr;
1259 void __user *addr;
1260 sigset_t set;
1261
1262 /* Always make any pending restarted system calls return -EINTR */
1263 current_thread_info()->restart_block.fn = do_no_restart_syscall;
1264
1265 sc = (struct sigcontext __user *)(regs->gpr[1] + __SIGNAL_FRAMESIZE);
1266 addr = sc;
1267 if (copy_from_user(&sigctx, sc, sizeof(sigctx)))
1268 goto badframe;
1269
1270#ifdef CONFIG_PPC64
1271 /*
1272 * Note that PPC32 puts the upper 32 bits of the sigmask in the
1273 * unused part of the signal stackframe
1274 */
1275 set.sig[0] = sigctx.oldmask + ((long)(sigctx._unused[3]) << 32);
1276#else
1277 set.sig[0] = sigctx.oldmask;
1278 set.sig[1] = sigctx._unused[3];
1279#endif
1280 restore_sigmask(&set);
1281
1282 sr = (struct mcontext __user *)from_user_ptr(sigctx.regs);
1283 addr = sr;
1284 if (!access_ok(VERIFY_READ, sr, sizeof(*sr))
1285 || restore_user_regs(regs, sr, 1))
1286 goto badframe;
1287
1288 set_thread_flag(TIF_RESTOREALL);
1289 return 0;
1290
1291badframe:
1292 if (show_unhandled_signals && printk_ratelimit())
1293 printk(KERN_INFO "%s[%d]: bad frame in sys_sigreturn: "
1294 "%p nip %08lx lr %08lx\n",
1295 current->comm, current->pid,
1296 addr, regs->nip, regs->link);
1297
1298 force_sig(SIGSEGV, current);
1299 return 0;
1300}