2 * Signal handling for 32bit PPC and 32bit tasks on 64bit PPC
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)
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
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.
20 #include <linux/sched.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 #include <linux/ratelimit.h>
30 #include <linux/syscalls.h>
31 #include <linux/compat.h>
33 #include <linux/wait.h>
34 #include <linux/unistd.h>
35 #include <linux/stddef.h>
36 #include <linux/tty.h>
37 #include <linux/binfmts.h>
40 #include <asm/uaccess.h>
41 #include <asm/cacheflush.h>
42 #include <asm/syscalls.h>
43 #include <asm/sigcontext.h>
45 #include <asm/switch_to.h>
49 #include <asm/unistd.h>
51 #include <asm/ucontext.h>
52 #include <asm/pgtable.h>
60 #define sys_rt_sigreturn compat_sys_rt_sigreturn
61 #define sys_swapcontext compat_sys_swapcontext
62 #define sys_sigreturn compat_sys_sigreturn
64 #define old_sigaction old_sigaction32
65 #define sigcontext sigcontext32
66 #define mcontext mcontext32
67 #define ucontext ucontext32
69 #define __save_altstack __compat_save_altstack
72 * Userspace code may pass a ucontext which doesn't include VSX added
73 * at the end. We need to check for this case.
75 #define UCONTEXTSIZEWITHOUTVSX \
76 (sizeof(struct ucontext) - sizeof(elf_vsrreghalf_t32))
79 * Returning 0 means we return to userspace via
80 * ret_from_except and thus restore all user
81 * registers from *regs. This is what we need
82 * to do when a signal has been delivered.
85 #define GP_REGS_SIZE min(sizeof(elf_gregset_t32), sizeof(struct pt_regs32))
86 #undef __SIGNAL_FRAMESIZE
87 #define __SIGNAL_FRAMESIZE __SIGNAL_FRAMESIZE32
89 #define ELF_NVRREG ELF_NVRREG32
92 * Functions for flipping sigsets (thanks to brain dead generic
93 * implementation that makes things simple for little endian only)
95 static inline int put_sigset_t(compat_sigset_t __user *uset, sigset_t *set)
99 switch (_NSIG_WORDS) {
100 case 4: cset.sig[6] = set->sig[3] & 0xffffffffull;
101 cset.sig[7] = set->sig[3] >> 32;
102 case 3: cset.sig[4] = set->sig[2] & 0xffffffffull;
103 cset.sig[5] = set->sig[2] >> 32;
104 case 2: cset.sig[2] = set->sig[1] & 0xffffffffull;
105 cset.sig[3] = set->sig[1] >> 32;
106 case 1: cset.sig[0] = set->sig[0] & 0xffffffffull;
107 cset.sig[1] = set->sig[0] >> 32;
109 return copy_to_user(uset, &cset, sizeof(*uset));
112 static inline int get_sigset_t(sigset_t *set,
113 const compat_sigset_t __user *uset)
117 if (copy_from_user(&s32, uset, sizeof(*uset)))
121 * Swap the 2 words of the 64-bit sigset_t (they are stored
122 * in the "wrong" endian in 32-bit user storage).
124 switch (_NSIG_WORDS) {
125 case 4: set->sig[3] = s32.sig[6] | (((long)s32.sig[7]) << 32);
126 case 3: set->sig[2] = s32.sig[4] | (((long)s32.sig[5]) << 32);
127 case 2: set->sig[1] = s32.sig[2] | (((long)s32.sig[3]) << 32);
128 case 1: set->sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32);
133 #define to_user_ptr(p) ptr_to_compat(p)
134 #define from_user_ptr(p) compat_ptr(p)
136 static inline int save_general_regs(struct pt_regs *regs,
137 struct mcontext __user *frame)
139 elf_greg_t64 *gregs = (elf_greg_t64 *)regs;
142 WARN_ON(!FULL_REGS(regs));
144 for (i = 0; i <= PT_RESULT; i ++) {
145 if (i == 14 && !FULL_REGS(regs))
147 if (__put_user((unsigned int)gregs[i], &frame->mc_gregs[i]))
153 static inline int restore_general_regs(struct pt_regs *regs,
154 struct mcontext __user *sr)
156 elf_greg_t64 *gregs = (elf_greg_t64 *)regs;
159 for (i = 0; i <= PT_RESULT; i++) {
160 if ((i == PT_MSR) || (i == PT_SOFTE))
162 if (__get_user(gregs[i], &sr->mc_gregs[i]))
168 #else /* CONFIG_PPC64 */
170 #define GP_REGS_SIZE min(sizeof(elf_gregset_t), sizeof(struct pt_regs))
172 static inline int put_sigset_t(sigset_t __user *uset, sigset_t *set)
174 return copy_to_user(uset, set, sizeof(*uset));
177 static inline int get_sigset_t(sigset_t *set, const sigset_t __user *uset)
179 return copy_from_user(set, uset, sizeof(*uset));
182 #define to_user_ptr(p) ((unsigned long)(p))
183 #define from_user_ptr(p) ((void __user *)(p))
185 static inline int save_general_regs(struct pt_regs *regs,
186 struct mcontext __user *frame)
188 WARN_ON(!FULL_REGS(regs));
189 return __copy_to_user(&frame->mc_gregs, regs, GP_REGS_SIZE);
192 static inline int restore_general_regs(struct pt_regs *regs,
193 struct mcontext __user *sr)
195 /* copy up to but not including MSR */
196 if (__copy_from_user(regs, &sr->mc_gregs,
197 PT_MSR * sizeof(elf_greg_t)))
199 /* copy from orig_r3 (the word after the MSR) up to the end */
200 if (__copy_from_user(®s->orig_gpr3, &sr->mc_gregs[PT_ORIG_R3],
201 GP_REGS_SIZE - PT_ORIG_R3 * sizeof(elf_greg_t)))
208 * When we have signals to deliver, we set up on the
209 * user stack, going down from the original stack pointer:
210 * an ABI gap of 56 words
212 * a sigcontext struct
213 * a gap of __SIGNAL_FRAMESIZE bytes
215 * Each of these things must be a multiple of 16 bytes in size. The following
216 * structure represent all of this except the __SIGNAL_FRAMESIZE gap
220 struct sigcontext sctx; /* the sigcontext */
221 struct mcontext mctx; /* all the register values */
222 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
223 struct sigcontext sctx_transact;
224 struct mcontext mctx_transact;
227 * Programs using the rs6000/xcoff abi can save up to 19 gp
228 * regs and 18 fp regs below sp before decrementing it.
233 /* We use the mc_pad field for the signal return trampoline. */
237 * When we have rt signals to deliver, we set up on the
238 * user stack, going down from the original stack pointer:
239 * one rt_sigframe struct (siginfo + ucontext + ABI gap)
240 * a gap of __SIGNAL_FRAMESIZE+16 bytes
241 * (the +16 is to get the siginfo and ucontext in the same
242 * positions as in older kernels).
244 * Each of these things must be a multiple of 16 bytes in size.
249 compat_siginfo_t info;
254 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
255 struct ucontext uc_transact;
258 * Programs using the rs6000/xcoff abi can save up to 19 gp
259 * regs and 18 fp regs below sp before decrementing it.
265 unsigned long copy_fpr_to_user(void __user *to,
266 struct task_struct *task)
268 double buf[ELF_NFPREG];
271 /* save FPR copy to local buffer then write to the thread_struct */
272 for (i = 0; i < (ELF_NFPREG - 1) ; i++)
273 buf[i] = task->thread.TS_FPR(i);
274 memcpy(&buf[i], &task->thread.fpscr, sizeof(double));
275 return __copy_to_user(to, buf, ELF_NFPREG * sizeof(double));
278 unsigned long copy_fpr_from_user(struct task_struct *task,
281 double buf[ELF_NFPREG];
284 if (__copy_from_user(buf, from, ELF_NFPREG * sizeof(double)))
286 for (i = 0; i < (ELF_NFPREG - 1) ; i++)
287 task->thread.TS_FPR(i) = buf[i];
288 memcpy(&task->thread.fpscr, &buf[i], sizeof(double));
293 unsigned long copy_vsx_to_user(void __user *to,
294 struct task_struct *task)
296 double buf[ELF_NVSRHALFREG];
299 /* save FPR copy to local buffer then write to the thread_struct */
300 for (i = 0; i < ELF_NVSRHALFREG; i++)
301 buf[i] = task->thread.fpr[i][TS_VSRLOWOFFSET];
302 return __copy_to_user(to, buf, ELF_NVSRHALFREG * sizeof(double));
305 unsigned long copy_vsx_from_user(struct task_struct *task,
308 double buf[ELF_NVSRHALFREG];
311 if (__copy_from_user(buf, from, ELF_NVSRHALFREG * sizeof(double)))
313 for (i = 0; i < ELF_NVSRHALFREG ; i++)
314 task->thread.fpr[i][TS_VSRLOWOFFSET] = buf[i];
318 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
319 unsigned long copy_transact_fpr_to_user(void __user *to,
320 struct task_struct *task)
322 double buf[ELF_NFPREG];
325 /* save FPR copy to local buffer then write to the thread_struct */
326 for (i = 0; i < (ELF_NFPREG - 1) ; i++)
327 buf[i] = task->thread.TS_TRANS_FPR(i);
328 memcpy(&buf[i], &task->thread.transact_fpscr, sizeof(double));
329 return __copy_to_user(to, buf, ELF_NFPREG * sizeof(double));
332 unsigned long copy_transact_fpr_from_user(struct task_struct *task,
335 double buf[ELF_NFPREG];
338 if (__copy_from_user(buf, from, ELF_NFPREG * sizeof(double)))
340 for (i = 0; i < (ELF_NFPREG - 1) ; i++)
341 task->thread.TS_TRANS_FPR(i) = buf[i];
342 memcpy(&task->thread.transact_fpscr, &buf[i], sizeof(double));
347 unsigned long copy_transact_vsx_to_user(void __user *to,
348 struct task_struct *task)
350 double buf[ELF_NVSRHALFREG];
353 /* save FPR copy to local buffer then write to the thread_struct */
354 for (i = 0; i < ELF_NVSRHALFREG; i++)
355 buf[i] = task->thread.transact_fpr[i][TS_VSRLOWOFFSET];
356 return __copy_to_user(to, buf, ELF_NVSRHALFREG * sizeof(double));
359 unsigned long copy_transact_vsx_from_user(struct task_struct *task,
362 double buf[ELF_NVSRHALFREG];
365 if (__copy_from_user(buf, from, ELF_NVSRHALFREG * sizeof(double)))
367 for (i = 0; i < ELF_NVSRHALFREG ; i++)
368 task->thread.transact_fpr[i][TS_VSRLOWOFFSET] = buf[i];
371 #endif /* CONFIG_PPC_TRANSACTIONAL_MEM */
373 inline unsigned long copy_fpr_to_user(void __user *to,
374 struct task_struct *task)
376 return __copy_to_user(to, task->thread.fpr,
377 ELF_NFPREG * sizeof(double));
380 inline unsigned long copy_fpr_from_user(struct task_struct *task,
383 return __copy_from_user(task->thread.fpr, from,
384 ELF_NFPREG * sizeof(double));
387 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
388 inline unsigned long copy_transact_fpr_to_user(void __user *to,
389 struct task_struct *task)
391 return __copy_to_user(to, task->thread.transact_fpr,
392 ELF_NFPREG * sizeof(double));
395 inline unsigned long copy_transact_fpr_from_user(struct task_struct *task,
398 return __copy_from_user(task->thread.transact_fpr, from,
399 ELF_NFPREG * sizeof(double));
401 #endif /* CONFIG_PPC_TRANSACTIONAL_MEM */
405 * Save the current user registers on the user stack.
406 * We only save the altivec/spe registers if the process has used
407 * altivec/spe instructions at some point.
409 static int save_user_regs(struct pt_regs *regs, struct mcontext __user *frame,
410 struct mcontext __user *tm_frame, int sigret,
411 int ctx_has_vsx_region)
413 unsigned long msr = regs->msr;
415 /* Make sure floating point registers are stored in regs */
416 flush_fp_to_thread(current);
418 /* save general registers */
419 if (save_general_regs(regs, frame))
422 #ifdef CONFIG_ALTIVEC
423 /* save altivec registers */
424 if (current->thread.used_vr) {
425 flush_altivec_to_thread(current);
426 if (__copy_to_user(&frame->mc_vregs, current->thread.vr,
427 ELF_NVRREG * sizeof(vector128)))
429 /* set MSR_VEC in the saved MSR value to indicate that
430 frame->mc_vregs contains valid data */
433 /* else assert((regs->msr & MSR_VEC) == 0) */
435 /* We always copy to/from vrsave, it's 0 if we don't have or don't
436 * use altivec. Since VSCR only contains 32 bits saved in the least
437 * significant bits of a vector, we "cheat" and stuff VRSAVE in the
438 * most significant bits of that same vector. --BenH
440 if (__put_user(current->thread.vrsave, (u32 __user *)&frame->mc_vregs[32]))
442 #endif /* CONFIG_ALTIVEC */
443 if (copy_fpr_to_user(&frame->mc_fregs, current))
447 * Clear the MSR VSX bit to indicate there is no valid state attached
448 * to this context, except in the specific case below where we set it.
453 * Copy VSR 0-31 upper half from thread_struct to local
454 * buffer, then write that to userspace. Also set MSR_VSX in
455 * the saved MSR value to indicate that frame->mc_vregs
456 * contains valid data
458 if (current->thread.used_vsr && ctx_has_vsx_region) {
459 __giveup_vsx(current);
460 if (copy_vsx_to_user(&frame->mc_vsregs, current))
464 #endif /* CONFIG_VSX */
466 /* save spe registers */
467 if (current->thread.used_spe) {
468 flush_spe_to_thread(current);
469 if (__copy_to_user(&frame->mc_vregs, current->thread.evr,
470 ELF_NEVRREG * sizeof(u32)))
472 /* set MSR_SPE in the saved MSR value to indicate that
473 frame->mc_vregs contains valid data */
476 /* else assert((regs->msr & MSR_SPE) == 0) */
478 /* We always copy to/from spefscr */
479 if (__put_user(current->thread.spefscr, (u32 __user *)&frame->mc_vregs + ELF_NEVRREG))
481 #endif /* CONFIG_SPE */
483 if (__put_user(msr, &frame->mc_gregs[PT_MSR]))
485 /* We need to write 0 the MSR top 32 bits in the tm frame so that we
486 * can check it on the restore to see if TM is active
488 if (tm_frame && __put_user(0, &tm_frame->mc_gregs[PT_MSR]))
492 /* Set up the sigreturn trampoline: li r0,sigret; sc */
493 if (__put_user(0x38000000UL + sigret, &frame->tramp[0])
494 || __put_user(0x44000002UL, &frame->tramp[1]))
496 flush_icache_range((unsigned long) &frame->tramp[0],
497 (unsigned long) &frame->tramp[2]);
503 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
505 * Save the current user registers on the user stack.
506 * We only save the altivec/spe registers if the process has used
507 * altivec/spe instructions at some point.
508 * We also save the transactional registers to a second ucontext in the
511 * See save_user_regs() and signal_64.c:setup_tm_sigcontexts().
513 static int save_tm_user_regs(struct pt_regs *regs,
514 struct mcontext __user *frame,
515 struct mcontext __user *tm_frame, int sigret)
517 unsigned long msr = regs->msr;
519 /* Make sure floating point registers are stored in regs */
520 flush_fp_to_thread(current);
522 /* Save both sets of general registers */
523 if (save_general_regs(¤t->thread.ckpt_regs, frame)
524 || save_general_regs(regs, tm_frame))
527 /* Stash the top half of the 64bit MSR into the 32bit MSR word
528 * of the transactional mcontext. This way we have a backward-compatible
529 * MSR in the 'normal' (checkpointed) mcontext and additionally one can
530 * also look at what type of transaction (T or S) was active at the
531 * time of the signal.
533 if (__put_user((msr >> 32), &tm_frame->mc_gregs[PT_MSR]))
536 #ifdef CONFIG_ALTIVEC
537 /* save altivec registers */
538 if (current->thread.used_vr) {
539 flush_altivec_to_thread(current);
540 if (__copy_to_user(&frame->mc_vregs, current->thread.vr,
541 ELF_NVRREG * sizeof(vector128)))
544 if (__copy_to_user(&tm_frame->mc_vregs,
545 current->thread.transact_vr,
546 ELF_NVRREG * sizeof(vector128)))
549 if (__copy_to_user(&tm_frame->mc_vregs,
551 ELF_NVRREG * sizeof(vector128)))
555 /* set MSR_VEC in the saved MSR value to indicate that
556 * frame->mc_vregs contains valid data
561 /* We always copy to/from vrsave, it's 0 if we don't have or don't
562 * use altivec. Since VSCR only contains 32 bits saved in the least
563 * significant bits of a vector, we "cheat" and stuff VRSAVE in the
564 * most significant bits of that same vector. --BenH
566 if (__put_user(current->thread.vrsave,
567 (u32 __user *)&frame->mc_vregs[32]))
570 if (__put_user(current->thread.transact_vrsave,
571 (u32 __user *)&tm_frame->mc_vregs[32]))
574 if (__put_user(current->thread.vrsave,
575 (u32 __user *)&tm_frame->mc_vregs[32]))
578 #endif /* CONFIG_ALTIVEC */
580 if (copy_fpr_to_user(&frame->mc_fregs, current))
583 if (copy_transact_fpr_to_user(&tm_frame->mc_fregs, current))
586 if (copy_fpr_to_user(&tm_frame->mc_fregs, current))
592 * Copy VSR 0-31 upper half from thread_struct to local
593 * buffer, then write that to userspace. Also set MSR_VSX in
594 * the saved MSR value to indicate that frame->mc_vregs
595 * contains valid data
597 if (current->thread.used_vsr) {
598 __giveup_vsx(current);
599 if (copy_vsx_to_user(&frame->mc_vsregs, current))
602 if (copy_transact_vsx_to_user(&tm_frame->mc_vsregs,
606 if (copy_vsx_to_user(&tm_frame->mc_vsregs, current))
612 #endif /* CONFIG_VSX */
614 /* SPE regs are not checkpointed with TM, so this section is
615 * simply the same as in save_user_regs().
617 if (current->thread.used_spe) {
618 flush_spe_to_thread(current);
619 if (__copy_to_user(&frame->mc_vregs, current->thread.evr,
620 ELF_NEVRREG * sizeof(u32)))
622 /* set MSR_SPE in the saved MSR value to indicate that
623 * frame->mc_vregs contains valid data */
627 /* We always copy to/from spefscr */
628 if (__put_user(current->thread.spefscr, (u32 __user *)&frame->mc_vregs + ELF_NEVRREG))
630 #endif /* CONFIG_SPE */
632 if (__put_user(msr, &frame->mc_gregs[PT_MSR]))
635 /* Set up the sigreturn trampoline: li r0,sigret; sc */
636 if (__put_user(0x38000000UL + sigret, &frame->tramp[0])
637 || __put_user(0x44000002UL, &frame->tramp[1]))
639 flush_icache_range((unsigned long) &frame->tramp[0],
640 (unsigned long) &frame->tramp[2]);
648 * Restore the current user register values from the user stack,
651 static long restore_user_regs(struct pt_regs *regs,
652 struct mcontext __user *sr, int sig)
655 unsigned int save_r2 = 0;
662 * restore general registers but not including MSR or SOFTE. Also
663 * take care of keeping r2 (TLS) intact if not a signal
666 save_r2 = (unsigned int)regs->gpr[2];
667 err = restore_general_regs(regs, sr);
669 err |= __get_user(msr, &sr->mc_gregs[PT_MSR]);
671 regs->gpr[2] = (unsigned long) save_r2;
675 /* if doing signal return, restore the previous little-endian mode */
677 regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE);
680 * Do this before updating the thread state in
681 * current->thread.fpr/vr/evr. That way, if we get preempted
682 * and another task grabs the FPU/Altivec/SPE, it won't be
683 * tempted to save the current CPU state into the thread_struct
684 * and corrupt what we are writing there.
686 discard_lazy_cpu_state();
688 #ifdef CONFIG_ALTIVEC
690 * Force the process to reload the altivec registers from
691 * current->thread when it next does altivec instructions
693 regs->msr &= ~MSR_VEC;
695 /* restore altivec registers from the stack */
696 if (__copy_from_user(current->thread.vr, &sr->mc_vregs,
697 sizeof(sr->mc_vregs)))
699 } else if (current->thread.used_vr)
700 memset(current->thread.vr, 0, ELF_NVRREG * sizeof(vector128));
702 /* Always get VRSAVE back */
703 if (__get_user(current->thread.vrsave, (u32 __user *)&sr->mc_vregs[32]))
705 #endif /* CONFIG_ALTIVEC */
706 if (copy_fpr_from_user(current, &sr->mc_fregs))
711 * Force the process to reload the VSX registers from
712 * current->thread when it next does VSX instruction.
714 regs->msr &= ~MSR_VSX;
717 * Restore altivec registers from the stack to a local
718 * buffer, then write this out to the thread_struct
720 if (copy_vsx_from_user(current, &sr->mc_vsregs))
722 } else if (current->thread.used_vsr)
723 for (i = 0; i < 32 ; i++)
724 current->thread.fpr[i][TS_VSRLOWOFFSET] = 0;
725 #endif /* CONFIG_VSX */
727 * force the process to reload the FP registers from
728 * current->thread when it next does FP instructions
730 regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1);
733 /* force the process to reload the spe registers from
734 current->thread when it next does spe instructions */
735 regs->msr &= ~MSR_SPE;
737 /* restore spe registers from the stack */
738 if (__copy_from_user(current->thread.evr, &sr->mc_vregs,
739 ELF_NEVRREG * sizeof(u32)))
741 } else if (current->thread.used_spe)
742 memset(current->thread.evr, 0, ELF_NEVRREG * sizeof(u32));
744 /* Always get SPEFSCR back */
745 if (__get_user(current->thread.spefscr, (u32 __user *)&sr->mc_vregs + ELF_NEVRREG))
747 #endif /* CONFIG_SPE */
752 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
754 * Restore the current user register values from the user stack, except for
755 * MSR, and recheckpoint the original checkpointed register state for processes
758 static long restore_tm_user_regs(struct pt_regs *regs,
759 struct mcontext __user *sr,
760 struct mcontext __user *tm_sr)
763 unsigned long msr, msr_hi;
769 * restore general registers but not including MSR or SOFTE. Also
770 * take care of keeping r2 (TLS) intact if not a signal.
771 * See comment in signal_64.c:restore_tm_sigcontexts();
772 * TFHAR is restored from the checkpointed NIP; TEXASR and TFIAR
773 * were set by the signal delivery.
775 err = restore_general_regs(regs, tm_sr);
776 err |= restore_general_regs(¤t->thread.ckpt_regs, sr);
778 err |= __get_user(current->thread.tm_tfhar, &sr->mc_gregs[PT_NIP]);
780 err |= __get_user(msr, &sr->mc_gregs[PT_MSR]);
784 /* Restore the previous little-endian mode */
785 regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE);
788 * Do this before updating the thread state in
789 * current->thread.fpr/vr/evr. That way, if we get preempted
790 * and another task grabs the FPU/Altivec/SPE, it won't be
791 * tempted to save the current CPU state into the thread_struct
792 * and corrupt what we are writing there.
794 discard_lazy_cpu_state();
796 #ifdef CONFIG_ALTIVEC
797 regs->msr &= ~MSR_VEC;
799 /* restore altivec registers from the stack */
800 if (__copy_from_user(current->thread.vr, &sr->mc_vregs,
801 sizeof(sr->mc_vregs)) ||
802 __copy_from_user(current->thread.transact_vr,
804 sizeof(sr->mc_vregs)))
806 } else if (current->thread.used_vr) {
807 memset(current->thread.vr, 0, ELF_NVRREG * sizeof(vector128));
808 memset(current->thread.transact_vr, 0,
809 ELF_NVRREG * sizeof(vector128));
812 /* Always get VRSAVE back */
813 if (__get_user(current->thread.vrsave,
814 (u32 __user *)&sr->mc_vregs[32]) ||
815 __get_user(current->thread.transact_vrsave,
816 (u32 __user *)&tm_sr->mc_vregs[32]))
818 #endif /* CONFIG_ALTIVEC */
820 regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1);
822 if (copy_fpr_from_user(current, &sr->mc_fregs) ||
823 copy_transact_fpr_from_user(current, &tm_sr->mc_fregs))
827 regs->msr &= ~MSR_VSX;
830 * Restore altivec registers from the stack to a local
831 * buffer, then write this out to the thread_struct
833 if (copy_vsx_from_user(current, &sr->mc_vsregs) ||
834 copy_transact_vsx_from_user(current, &tm_sr->mc_vsregs))
836 } else if (current->thread.used_vsr)
837 for (i = 0; i < 32 ; i++) {
838 current->thread.fpr[i][TS_VSRLOWOFFSET] = 0;
839 current->thread.transact_fpr[i][TS_VSRLOWOFFSET] = 0;
841 #endif /* CONFIG_VSX */
844 /* SPE regs are not checkpointed with TM, so this section is
845 * simply the same as in restore_user_regs().
847 regs->msr &= ~MSR_SPE;
849 if (__copy_from_user(current->thread.evr, &sr->mc_vregs,
850 ELF_NEVRREG * sizeof(u32)))
852 } else if (current->thread.used_spe)
853 memset(current->thread.evr, 0, ELF_NEVRREG * sizeof(u32));
855 /* Always get SPEFSCR back */
856 if (__get_user(current->thread.spefscr, (u32 __user *)&sr->mc_vregs
859 #endif /* CONFIG_SPE */
861 /* Now, recheckpoint. This loads up all of the checkpointed (older)
862 * registers, including FP and V[S]Rs. After recheckpointing, the
863 * transactional versions should be loaded.
866 /* Make sure the transaction is marked as failed */
867 current->thread.tm_texasr |= TEXASR_FS;
868 /* This loads the checkpointed FP/VEC state, if used */
869 tm_recheckpoint(¤t->thread, msr);
870 /* Get the top half of the MSR */
871 if (__get_user(msr_hi, &tm_sr->mc_gregs[PT_MSR]))
873 /* Pull in MSR TM from user context */
874 regs->msr = (regs->msr & ~MSR_TS_MASK) | ((msr_hi<<32) & MSR_TS_MASK);
876 /* This loads the speculative FP/VEC state, if used */
878 do_load_up_transact_fpu(¤t->thread);
879 regs->msr |= (MSR_FP | current->thread.fpexc_mode);
881 #ifdef CONFIG_ALTIVEC
883 do_load_up_transact_altivec(¤t->thread);
884 regs->msr |= MSR_VEC;
893 int copy_siginfo_to_user32(struct compat_siginfo __user *d, siginfo_t *s)
897 if (!access_ok (VERIFY_WRITE, d, sizeof(*d)))
900 /* If you change siginfo_t structure, please be sure
901 * this code is fixed accordingly.
902 * It should never copy any pad contained in the structure
903 * to avoid security leaks, but must copy the generic
904 * 3 ints plus the relevant union member.
905 * This routine must convert siginfo from 64bit to 32bit as well
908 err = __put_user(s->si_signo, &d->si_signo);
909 err |= __put_user(s->si_errno, &d->si_errno);
910 err |= __put_user((short)s->si_code, &d->si_code);
912 err |= __copy_to_user(&d->_sifields._pad, &s->_sifields._pad,
914 else switch(s->si_code >> 16) {
915 case __SI_CHLD >> 16:
916 err |= __put_user(s->si_pid, &d->si_pid);
917 err |= __put_user(s->si_uid, &d->si_uid);
918 err |= __put_user(s->si_utime, &d->si_utime);
919 err |= __put_user(s->si_stime, &d->si_stime);
920 err |= __put_user(s->si_status, &d->si_status);
922 case __SI_FAULT >> 16:
923 err |= __put_user((unsigned int)(unsigned long)s->si_addr,
926 case __SI_POLL >> 16:
927 err |= __put_user(s->si_band, &d->si_band);
928 err |= __put_user(s->si_fd, &d->si_fd);
930 case __SI_TIMER >> 16:
931 err |= __put_user(s->si_tid, &d->si_tid);
932 err |= __put_user(s->si_overrun, &d->si_overrun);
933 err |= __put_user(s->si_int, &d->si_int);
935 case __SI_RT >> 16: /* This is not generated by the kernel as of now. */
936 case __SI_MESGQ >> 16:
937 err |= __put_user(s->si_int, &d->si_int);
939 case __SI_KILL >> 16:
941 err |= __put_user(s->si_pid, &d->si_pid);
942 err |= __put_user(s->si_uid, &d->si_uid);
948 #define copy_siginfo_to_user copy_siginfo_to_user32
950 int copy_siginfo_from_user32(siginfo_t *to, struct compat_siginfo __user *from)
952 memset(to, 0, sizeof *to);
954 if (copy_from_user(to, from, 3*sizeof(int)) ||
955 copy_from_user(to->_sifields._pad,
956 from->_sifields._pad, SI_PAD_SIZE32))
961 #endif /* CONFIG_PPC64 */
964 * Set up a signal frame for a "real-time" signal handler
965 * (one which gets siginfo).
967 int handle_rt_signal32(unsigned long sig, struct k_sigaction *ka,
968 siginfo_t *info, sigset_t *oldset,
969 struct pt_regs *regs)
971 struct rt_sigframe __user *rt_sf;
972 struct mcontext __user *frame;
973 struct mcontext __user *tm_frame = NULL;
975 unsigned long newsp = 0;
979 /* Set up Signal Frame */
980 /* Put a Real Time Context onto stack */
981 rt_sf = get_sigframe(ka, get_tm_stackpointer(regs), sizeof(*rt_sf), 1);
983 if (unlikely(rt_sf == NULL))
986 /* Put the siginfo & fill in most of the ucontext */
987 if (copy_siginfo_to_user(&rt_sf->info, info)
988 || __put_user(0, &rt_sf->uc.uc_flags)
989 || __save_altstack(&rt_sf->uc.uc_stack, regs->gpr[1])
990 || __put_user(to_user_ptr(&rt_sf->uc.uc_mcontext),
992 || put_sigset_t(&rt_sf->uc.uc_sigmask, oldset))
995 /* Save user registers on the stack */
996 frame = &rt_sf->uc.uc_mcontext;
998 if (vdso32_rt_sigtramp && current->mm->context.vdso_base) {
1000 tramp = current->mm->context.vdso_base + vdso32_rt_sigtramp;
1002 sigret = __NR_rt_sigreturn;
1003 tramp = (unsigned long) frame->tramp;
1006 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1007 tm_frame = &rt_sf->uc_transact.uc_mcontext;
1008 if (MSR_TM_ACTIVE(regs->msr)) {
1009 if (save_tm_user_regs(regs, frame, tm_frame, sigret))
1015 if (save_user_regs(regs, frame, tm_frame, sigret, 1))
1020 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1021 if (MSR_TM_ACTIVE(regs->msr)) {
1022 if (__put_user((unsigned long)&rt_sf->uc_transact,
1024 || __put_user((unsigned long)tm_frame, &rt_sf->uc_transact.uc_regs))
1029 if (__put_user(0, &rt_sf->uc.uc_link))
1032 current->thread.fpscr.val = 0; /* turn off all fp exceptions */
1034 /* create a stack frame for the caller of the handler */
1035 newsp = ((unsigned long)rt_sf) - (__SIGNAL_FRAMESIZE + 16);
1036 addr = (void __user *)regs->gpr[1];
1037 if (put_user(regs->gpr[1], (u32 __user *)newsp))
1040 /* Fill registers for signal handler */
1041 regs->gpr[1] = newsp;
1043 regs->gpr[4] = (unsigned long) &rt_sf->info;
1044 regs->gpr[5] = (unsigned long) &rt_sf->uc;
1045 regs->gpr[6] = (unsigned long) rt_sf;
1046 regs->nip = (unsigned long) ka->sa.sa_handler;
1047 /* enter the signal handler in big-endian mode */
1048 regs->msr &= ~MSR_LE;
1049 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1050 /* Remove TM bits from thread's MSR. The MSR in the sigcontext
1051 * just indicates to userland that we were doing a transaction, but we
1052 * don't want to return in transactional state:
1054 regs->msr &= ~MSR_TS_MASK;
1060 printk("badframe in handle_rt_signal, regs=%p frame=%p newsp=%lx\n",
1061 regs, frame, newsp);
1063 if (show_unhandled_signals)
1064 printk_ratelimited(KERN_INFO
1065 "%s[%d]: bad frame in handle_rt_signal32: "
1066 "%p nip %08lx lr %08lx\n",
1067 current->comm, current->pid,
1068 addr, regs->nip, regs->link);
1070 force_sigsegv(sig, current);
1074 static int do_setcontext(struct ucontext __user *ucp, struct pt_regs *regs, int sig)
1077 struct mcontext __user *mcp;
1079 if (get_sigset_t(&set, &ucp->uc_sigmask))
1085 if (__get_user(cmcp, &ucp->uc_regs))
1087 mcp = (struct mcontext __user *)(u64)cmcp;
1088 /* no need to check access_ok(mcp), since mcp < 4GB */
1091 if (__get_user(mcp, &ucp->uc_regs))
1093 if (!access_ok(VERIFY_READ, mcp, sizeof(*mcp)))
1096 set_current_blocked(&set);
1097 if (restore_user_regs(regs, mcp, sig))
1103 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1104 static int do_setcontext_tm(struct ucontext __user *ucp,
1105 struct ucontext __user *tm_ucp,
1106 struct pt_regs *regs)
1109 struct mcontext __user *mcp;
1110 struct mcontext __user *tm_mcp;
1114 if (get_sigset_t(&set, &ucp->uc_sigmask))
1117 if (__get_user(cmcp, &ucp->uc_regs) ||
1118 __get_user(tm_cmcp, &tm_ucp->uc_regs))
1120 mcp = (struct mcontext __user *)(u64)cmcp;
1121 tm_mcp = (struct mcontext __user *)(u64)tm_cmcp;
1122 /* no need to check access_ok(mcp), since mcp < 4GB */
1124 set_current_blocked(&set);
1125 if (restore_tm_user_regs(regs, mcp, tm_mcp))
1132 long sys_swapcontext(struct ucontext __user *old_ctx,
1133 struct ucontext __user *new_ctx,
1134 int ctx_size, int r6, int r7, int r8, struct pt_regs *regs)
1137 int ctx_has_vsx_region = 0;
1140 unsigned long new_msr = 0;
1143 struct mcontext __user *mcp;
1147 * Get pointer to the real mcontext. No need for
1148 * access_ok since we are dealing with compat
1151 if (__get_user(cmcp, &new_ctx->uc_regs))
1153 mcp = (struct mcontext __user *)(u64)cmcp;
1154 if (__get_user(new_msr, &mcp->mc_gregs[PT_MSR]))
1158 * Check that the context is not smaller than the original
1159 * size (with VMX but without VSX)
1161 if (ctx_size < UCONTEXTSIZEWITHOUTVSX)
1164 * If the new context state sets the MSR VSX bits but
1165 * it doesn't provide VSX state.
1167 if ((ctx_size < sizeof(struct ucontext)) &&
1168 (new_msr & MSR_VSX))
1170 /* Does the context have enough room to store VSX data? */
1171 if (ctx_size >= sizeof(struct ucontext))
1172 ctx_has_vsx_region = 1;
1174 /* Context size is for future use. Right now, we only make sure
1175 * we are passed something we understand
1177 if (ctx_size < sizeof(struct ucontext))
1180 if (old_ctx != NULL) {
1181 struct mcontext __user *mctx;
1184 * old_ctx might not be 16-byte aligned, in which
1185 * case old_ctx->uc_mcontext won't be either.
1186 * Because we have the old_ctx->uc_pad2 field
1187 * before old_ctx->uc_mcontext, we need to round down
1188 * from &old_ctx->uc_mcontext to a 16-byte boundary.
1190 mctx = (struct mcontext __user *)
1191 ((unsigned long) &old_ctx->uc_mcontext & ~0xfUL);
1192 if (!access_ok(VERIFY_WRITE, old_ctx, ctx_size)
1193 || save_user_regs(regs, mctx, NULL, 0, ctx_has_vsx_region)
1194 || put_sigset_t(&old_ctx->uc_sigmask, ¤t->blocked)
1195 || __put_user(to_user_ptr(mctx), &old_ctx->uc_regs))
1198 if (new_ctx == NULL)
1200 if (!access_ok(VERIFY_READ, new_ctx, ctx_size)
1201 || __get_user(tmp, (u8 __user *) new_ctx)
1202 || __get_user(tmp, (u8 __user *) new_ctx + ctx_size - 1))
1206 * If we get a fault copying the context into the kernel's
1207 * image of the user's registers, we can't just return -EFAULT
1208 * because the user's registers will be corrupted. For instance
1209 * the NIP value may have been updated but not some of the
1210 * other registers. Given that we have done the access_ok
1211 * and successfully read the first and last bytes of the region
1212 * above, this should only happen in an out-of-memory situation
1213 * or if another thread unmaps the region containing the context.
1214 * We kill the task with a SIGSEGV in this situation.
1216 if (do_setcontext(new_ctx, regs, 0))
1219 set_thread_flag(TIF_RESTOREALL);
1223 long sys_rt_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8,
1224 struct pt_regs *regs)
1226 struct rt_sigframe __user *rt_sf;
1227 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1228 struct ucontext __user *uc_transact;
1229 unsigned long msr_hi;
1233 /* Always make any pending restarted system calls return -EINTR */
1234 current_thread_info()->restart_block.fn = do_no_restart_syscall;
1236 rt_sf = (struct rt_sigframe __user *)
1237 (regs->gpr[1] + __SIGNAL_FRAMESIZE + 16);
1238 if (!access_ok(VERIFY_READ, rt_sf, sizeof(*rt_sf)))
1240 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1241 if (__get_user(tmp, &rt_sf->uc.uc_link))
1243 uc_transact = (struct ucontext __user *)(uintptr_t)tmp;
1246 struct mcontext __user *mcp;
1248 if (__get_user(cmcp, &uc_transact->uc_regs))
1250 mcp = (struct mcontext __user *)(u64)cmcp;
1251 /* The top 32 bits of the MSR are stashed in the transactional
1253 if (__get_user(msr_hi, &mcp->mc_gregs[PT_MSR]))
1256 if (MSR_TM_ACTIVE(msr_hi<<32)) {
1257 /* We only recheckpoint on return if we're
1261 if (do_setcontext_tm(&rt_sf->uc, uc_transact, regs))
1266 /* Fall through, for non-TM restore */
1268 if (do_setcontext(&rt_sf->uc, regs, 1))
1272 * It's not clear whether or why it is desirable to save the
1273 * sigaltstack setting on signal delivery and restore it on
1274 * signal return. But other architectures do this and we have
1275 * always done it up until now so it is probably better not to
1276 * change it. -- paulus
1279 if (compat_restore_altstack(&rt_sf->uc.uc_stack))
1282 if (restore_altstack(&rt_sf->uc.uc_stack))
1285 set_thread_flag(TIF_RESTOREALL);
1289 if (show_unhandled_signals)
1290 printk_ratelimited(KERN_INFO
1291 "%s[%d]: bad frame in sys_rt_sigreturn: "
1292 "%p nip %08lx lr %08lx\n",
1293 current->comm, current->pid,
1294 rt_sf, regs->nip, regs->link);
1296 force_sig(SIGSEGV, current);
1301 int sys_debug_setcontext(struct ucontext __user *ctx,
1302 int ndbg, struct sig_dbg_op __user *dbg,
1303 int r6, int r7, int r8,
1304 struct pt_regs *regs)
1306 struct sig_dbg_op op;
1309 unsigned long new_msr = regs->msr;
1310 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
1311 unsigned long new_dbcr0 = current->thread.dbcr0;
1314 for (i=0; i<ndbg; i++) {
1315 if (copy_from_user(&op, dbg + i, sizeof(op)))
1317 switch (op.dbg_type) {
1318 case SIG_DBG_SINGLE_STEPPING:
1319 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
1322 new_dbcr0 |= (DBCR0_IDM | DBCR0_IC);
1324 new_dbcr0 &= ~DBCR0_IC;
1325 if (!DBCR_ACTIVE_EVENTS(new_dbcr0,
1326 current->thread.dbcr1)) {
1328 new_dbcr0 &= ~DBCR0_IDM;
1338 case SIG_DBG_BRANCH_TRACING:
1339 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
1354 /* We wait until here to actually install the values in the
1355 registers so if we fail in the above loop, it will not
1356 affect the contents of these registers. After this point,
1357 failure is a problem, anyway, and it's very unlikely unless
1358 the user is really doing something wrong. */
1359 regs->msr = new_msr;
1360 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
1361 current->thread.dbcr0 = new_dbcr0;
1364 if (!access_ok(VERIFY_READ, ctx, sizeof(*ctx))
1365 || __get_user(tmp, (u8 __user *) ctx)
1366 || __get_user(tmp, (u8 __user *) (ctx + 1) - 1))
1370 * If we get a fault copying the context into the kernel's
1371 * image of the user's registers, we can't just return -EFAULT
1372 * because the user's registers will be corrupted. For instance
1373 * the NIP value may have been updated but not some of the
1374 * other registers. Given that we have done the access_ok
1375 * and successfully read the first and last bytes of the region
1376 * above, this should only happen in an out-of-memory situation
1377 * or if another thread unmaps the region containing the context.
1378 * We kill the task with a SIGSEGV in this situation.
1380 if (do_setcontext(ctx, regs, 1)) {
1381 if (show_unhandled_signals)
1382 printk_ratelimited(KERN_INFO "%s[%d]: bad frame in "
1383 "sys_debug_setcontext: %p nip %08lx "
1385 current->comm, current->pid,
1386 ctx, regs->nip, regs->link);
1388 force_sig(SIGSEGV, current);
1393 * It's not clear whether or why it is desirable to save the
1394 * sigaltstack setting on signal delivery and restore it on
1395 * signal return. But other architectures do this and we have
1396 * always done it up until now so it is probably better not to
1397 * change it. -- paulus
1399 restore_altstack(&ctx->uc_stack);
1401 set_thread_flag(TIF_RESTOREALL);
1408 * OK, we're invoking a handler
1410 int handle_signal32(unsigned long sig, struct k_sigaction *ka,
1411 siginfo_t *info, sigset_t *oldset, struct pt_regs *regs)
1413 struct sigcontext __user *sc;
1414 struct sigframe __user *frame;
1415 struct mcontext __user *tm_mctx = NULL;
1416 unsigned long newsp = 0;
1418 unsigned long tramp;
1420 /* Set up Signal Frame */
1421 frame = get_sigframe(ka, get_tm_stackpointer(regs), sizeof(*frame), 1);
1422 if (unlikely(frame == NULL))
1424 sc = (struct sigcontext __user *) &frame->sctx;
1427 #error "Please adjust handle_signal()"
1429 if (__put_user(to_user_ptr(ka->sa.sa_handler), &sc->handler)
1430 || __put_user(oldset->sig[0], &sc->oldmask)
1432 || __put_user((oldset->sig[0] >> 32), &sc->_unused[3])
1434 || __put_user(oldset->sig[1], &sc->_unused[3])
1436 || __put_user(to_user_ptr(&frame->mctx), &sc->regs)
1437 || __put_user(sig, &sc->signal))
1440 if (vdso32_sigtramp && current->mm->context.vdso_base) {
1442 tramp = current->mm->context.vdso_base + vdso32_sigtramp;
1444 sigret = __NR_sigreturn;
1445 tramp = (unsigned long) frame->mctx.tramp;
1448 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1449 tm_mctx = &frame->mctx_transact;
1450 if (MSR_TM_ACTIVE(regs->msr)) {
1451 if (save_tm_user_regs(regs, &frame->mctx, &frame->mctx_transact,
1458 if (save_user_regs(regs, &frame->mctx, tm_mctx, sigret, 1))
1464 current->thread.fpscr.val = 0; /* turn off all fp exceptions */
1466 /* create a stack frame for the caller of the handler */
1467 newsp = ((unsigned long)frame) - __SIGNAL_FRAMESIZE;
1468 if (put_user(regs->gpr[1], (u32 __user *)newsp))
1471 regs->gpr[1] = newsp;
1473 regs->gpr[4] = (unsigned long) sc;
1474 regs->nip = (unsigned long) ka->sa.sa_handler;
1475 /* enter the signal handler in big-endian mode */
1476 regs->msr &= ~MSR_LE;
1477 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1478 /* Remove TM bits from thread's MSR. The MSR in the sigcontext
1479 * just indicates to userland that we were doing a transaction, but we
1480 * don't want to return in transactional state:
1482 regs->msr &= ~MSR_TS_MASK;
1488 printk("badframe in handle_signal, regs=%p frame=%p newsp=%lx\n",
1489 regs, frame, newsp);
1491 if (show_unhandled_signals)
1492 printk_ratelimited(KERN_INFO
1493 "%s[%d]: bad frame in handle_signal32: "
1494 "%p nip %08lx lr %08lx\n",
1495 current->comm, current->pid,
1496 frame, regs->nip, regs->link);
1498 force_sigsegv(sig, current);
1503 * Do a signal return; undo the signal stack.
1505 long sys_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8,
1506 struct pt_regs *regs)
1508 struct sigframe __user *sf;
1509 struct sigcontext __user *sc;
1510 struct sigcontext sigctx;
1511 struct mcontext __user *sr;
1514 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1515 struct mcontext __user *mcp, *tm_mcp;
1516 unsigned long msr_hi;
1519 /* Always make any pending restarted system calls return -EINTR */
1520 current_thread_info()->restart_block.fn = do_no_restart_syscall;
1522 sf = (struct sigframe __user *)(regs->gpr[1] + __SIGNAL_FRAMESIZE);
1525 if (copy_from_user(&sigctx, sc, sizeof(sigctx)))
1530 * Note that PPC32 puts the upper 32 bits of the sigmask in the
1531 * unused part of the signal stackframe
1533 set.sig[0] = sigctx.oldmask + ((long)(sigctx._unused[3]) << 32);
1535 set.sig[0] = sigctx.oldmask;
1536 set.sig[1] = sigctx._unused[3];
1538 set_current_blocked(&set);
1540 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1541 mcp = (struct mcontext __user *)&sf->mctx;
1542 tm_mcp = (struct mcontext __user *)&sf->mctx_transact;
1543 if (__get_user(msr_hi, &tm_mcp->mc_gregs[PT_MSR]))
1545 if (MSR_TM_ACTIVE(msr_hi<<32)) {
1546 if (!cpu_has_feature(CPU_FTR_TM))
1548 if (restore_tm_user_regs(regs, mcp, tm_mcp))
1553 sr = (struct mcontext __user *)from_user_ptr(sigctx.regs);
1555 if (!access_ok(VERIFY_READ, sr, sizeof(*sr))
1556 || restore_user_regs(regs, sr, 1))
1560 set_thread_flag(TIF_RESTOREALL);
1564 if (show_unhandled_signals)
1565 printk_ratelimited(KERN_INFO
1566 "%s[%d]: bad frame in sys_sigreturn: "
1567 "%p nip %08lx lr %08lx\n",
1568 current->comm, current->pid,
1569 addr, regs->nip, regs->link);
1571 force_sig(SIGSEGV, current);