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
439 * Note that the current VRSAVE value is in the SPR at this point.
441 if (cpu_has_feature(CPU_FTR_ALTIVEC))
442 current->thread.vrsave = mfspr(SPRN_VRSAVE);
443 if (__put_user(current->thread.vrsave, (u32 __user *)&frame->mc_vregs[32]))
445 #endif /* CONFIG_ALTIVEC */
446 if (copy_fpr_to_user(&frame->mc_fregs, current))
450 * Copy VSR 0-31 upper half from thread_struct to local
451 * buffer, then write that to userspace. Also set MSR_VSX in
452 * the saved MSR value to indicate that frame->mc_vregs
453 * contains valid data
455 if (current->thread.used_vsr && ctx_has_vsx_region) {
456 __giveup_vsx(current);
457 if (copy_vsx_to_user(&frame->mc_vsregs, current))
461 #endif /* CONFIG_VSX */
463 /* save spe registers */
464 if (current->thread.used_spe) {
465 flush_spe_to_thread(current);
466 if (__copy_to_user(&frame->mc_vregs, current->thread.evr,
467 ELF_NEVRREG * sizeof(u32)))
469 /* set MSR_SPE in the saved MSR value to indicate that
470 frame->mc_vregs contains valid data */
473 /* else assert((regs->msr & MSR_SPE) == 0) */
475 /* We always copy to/from spefscr */
476 if (__put_user(current->thread.spefscr, (u32 __user *)&frame->mc_vregs + ELF_NEVRREG))
478 #endif /* CONFIG_SPE */
480 if (__put_user(msr, &frame->mc_gregs[PT_MSR]))
482 /* We need to write 0 the MSR top 32 bits in the tm frame so that we
483 * can check it on the restore to see if TM is active
485 if (tm_frame && __put_user(0, &tm_frame->mc_gregs[PT_MSR]))
489 /* Set up the sigreturn trampoline: li r0,sigret; sc */
490 if (__put_user(0x38000000UL + sigret, &frame->tramp[0])
491 || __put_user(0x44000002UL, &frame->tramp[1]))
493 flush_icache_range((unsigned long) &frame->tramp[0],
494 (unsigned long) &frame->tramp[2]);
500 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
502 * Save the current user registers on the user stack.
503 * We only save the altivec/spe registers if the process has used
504 * altivec/spe instructions at some point.
505 * We also save the transactional registers to a second ucontext in the
508 * See save_user_regs() and signal_64.c:setup_tm_sigcontexts().
510 static int save_tm_user_regs(struct pt_regs *regs,
511 struct mcontext __user *frame,
512 struct mcontext __user *tm_frame, int sigret)
514 unsigned long msr = regs->msr;
516 /* Make sure floating point registers are stored in regs */
517 flush_fp_to_thread(current);
519 /* Save both sets of general registers */
520 if (save_general_regs(¤t->thread.ckpt_regs, frame)
521 || save_general_regs(regs, tm_frame))
524 /* Stash the top half of the 64bit MSR into the 32bit MSR word
525 * of the transactional mcontext. This way we have a backward-compatible
526 * MSR in the 'normal' (checkpointed) mcontext and additionally one can
527 * also look at what type of transaction (T or S) was active at the
528 * time of the signal.
530 if (__put_user((msr >> 32), &tm_frame->mc_gregs[PT_MSR]))
533 #ifdef CONFIG_ALTIVEC
534 /* save altivec registers */
535 if (current->thread.used_vr) {
536 flush_altivec_to_thread(current);
537 if (__copy_to_user(&frame->mc_vregs, current->thread.vr,
538 ELF_NVRREG * sizeof(vector128)))
541 if (__copy_to_user(&tm_frame->mc_vregs,
542 current->thread.transact_vr,
543 ELF_NVRREG * sizeof(vector128)))
546 if (__copy_to_user(&tm_frame->mc_vregs,
548 ELF_NVRREG * sizeof(vector128)))
552 /* set MSR_VEC in the saved MSR value to indicate that
553 * frame->mc_vregs contains valid data
558 /* We always copy to/from vrsave, it's 0 if we don't have or don't
559 * use altivec. Since VSCR only contains 32 bits saved in the least
560 * significant bits of a vector, we "cheat" and stuff VRSAVE in the
561 * most significant bits of that same vector. --BenH
563 if (cpu_has_feature(CPU_FTR_ALTIVEC))
564 current->thread.vrsave = mfspr(SPRN_VRSAVE);
565 if (__put_user(current->thread.vrsave,
566 (u32 __user *)&frame->mc_vregs[32]))
569 if (__put_user(current->thread.transact_vrsave,
570 (u32 __user *)&tm_frame->mc_vregs[32]))
573 if (__put_user(current->thread.vrsave,
574 (u32 __user *)&tm_frame->mc_vregs[32]))
577 #endif /* CONFIG_ALTIVEC */
579 if (copy_fpr_to_user(&frame->mc_fregs, current))
582 if (copy_transact_fpr_to_user(&tm_frame->mc_fregs, current))
585 if (copy_fpr_to_user(&tm_frame->mc_fregs, current))
591 * Copy VSR 0-31 upper half from thread_struct to local
592 * buffer, then write that to userspace. Also set MSR_VSX in
593 * the saved MSR value to indicate that frame->mc_vregs
594 * contains valid data
596 if (current->thread.used_vsr) {
597 __giveup_vsx(current);
598 if (copy_vsx_to_user(&frame->mc_vsregs, current))
601 if (copy_transact_vsx_to_user(&tm_frame->mc_vsregs,
605 if (copy_vsx_to_user(&tm_frame->mc_vsregs, current))
611 #endif /* CONFIG_VSX */
613 /* SPE regs are not checkpointed with TM, so this section is
614 * simply the same as in save_user_regs().
616 if (current->thread.used_spe) {
617 flush_spe_to_thread(current);
618 if (__copy_to_user(&frame->mc_vregs, current->thread.evr,
619 ELF_NEVRREG * sizeof(u32)))
621 /* set MSR_SPE in the saved MSR value to indicate that
622 * frame->mc_vregs contains valid data */
626 /* We always copy to/from spefscr */
627 if (__put_user(current->thread.spefscr, (u32 __user *)&frame->mc_vregs + ELF_NEVRREG))
629 #endif /* CONFIG_SPE */
631 if (__put_user(msr, &frame->mc_gregs[PT_MSR]))
634 /* Set up the sigreturn trampoline: li r0,sigret; sc */
635 if (__put_user(0x38000000UL + sigret, &frame->tramp[0])
636 || __put_user(0x44000002UL, &frame->tramp[1]))
638 flush_icache_range((unsigned long) &frame->tramp[0],
639 (unsigned long) &frame->tramp[2]);
647 * Restore the current user register values from the user stack,
650 static long restore_user_regs(struct pt_regs *regs,
651 struct mcontext __user *sr, int sig)
654 unsigned int save_r2 = 0;
661 * restore general registers but not including MSR or SOFTE. Also
662 * take care of keeping r2 (TLS) intact if not a signal
665 save_r2 = (unsigned int)regs->gpr[2];
666 err = restore_general_regs(regs, sr);
668 err |= __get_user(msr, &sr->mc_gregs[PT_MSR]);
670 regs->gpr[2] = (unsigned long) save_r2;
674 /* if doing signal return, restore the previous little-endian mode */
676 regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE);
679 * Do this before updating the thread state in
680 * current->thread.fpr/vr/evr. That way, if we get preempted
681 * and another task grabs the FPU/Altivec/SPE, it won't be
682 * tempted to save the current CPU state into the thread_struct
683 * and corrupt what we are writing there.
685 discard_lazy_cpu_state();
687 #ifdef CONFIG_ALTIVEC
689 * Force the process to reload the altivec registers from
690 * current->thread when it next does altivec instructions
692 regs->msr &= ~MSR_VEC;
694 /* restore altivec registers from the stack */
695 if (__copy_from_user(current->thread.vr, &sr->mc_vregs,
696 sizeof(sr->mc_vregs)))
698 } else if (current->thread.used_vr)
699 memset(current->thread.vr, 0, ELF_NVRREG * sizeof(vector128));
701 /* Always get VRSAVE back */
702 if (__get_user(current->thread.vrsave, (u32 __user *)&sr->mc_vregs[32]))
704 if (cpu_has_feature(CPU_FTR_ALTIVEC))
705 mtspr(SPRN_VRSAVE, current->thread.vrsave);
706 #endif /* CONFIG_ALTIVEC */
707 if (copy_fpr_from_user(current, &sr->mc_fregs))
712 * Force the process to reload the VSX registers from
713 * current->thread when it next does VSX instruction.
715 regs->msr &= ~MSR_VSX;
718 * Restore altivec registers from the stack to a local
719 * buffer, then write this out to the thread_struct
721 if (copy_vsx_from_user(current, &sr->mc_vsregs))
723 } else if (current->thread.used_vsr)
724 for (i = 0; i < 32 ; i++)
725 current->thread.fpr[i][TS_VSRLOWOFFSET] = 0;
726 #endif /* CONFIG_VSX */
728 * force the process to reload the FP registers from
729 * current->thread when it next does FP instructions
731 regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1);
734 /* force the process to reload the spe registers from
735 current->thread when it next does spe instructions */
736 regs->msr &= ~MSR_SPE;
738 /* restore spe registers from the stack */
739 if (__copy_from_user(current->thread.evr, &sr->mc_vregs,
740 ELF_NEVRREG * sizeof(u32)))
742 } else if (current->thread.used_spe)
743 memset(current->thread.evr, 0, ELF_NEVRREG * sizeof(u32));
745 /* Always get SPEFSCR back */
746 if (__get_user(current->thread.spefscr, (u32 __user *)&sr->mc_vregs + ELF_NEVRREG))
748 #endif /* CONFIG_SPE */
753 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
755 * Restore the current user register values from the user stack, except for
756 * MSR, and recheckpoint the original checkpointed register state for processes
759 static long restore_tm_user_regs(struct pt_regs *regs,
760 struct mcontext __user *sr,
761 struct mcontext __user *tm_sr)
764 unsigned long msr, msr_hi;
770 * restore general registers but not including MSR or SOFTE. Also
771 * take care of keeping r2 (TLS) intact if not a signal.
772 * See comment in signal_64.c:restore_tm_sigcontexts();
773 * TFHAR is restored from the checkpointed NIP; TEXASR and TFIAR
774 * were set by the signal delivery.
776 err = restore_general_regs(regs, tm_sr);
777 err |= restore_general_regs(¤t->thread.ckpt_regs, sr);
779 err |= __get_user(current->thread.tm_tfhar, &sr->mc_gregs[PT_NIP]);
781 err |= __get_user(msr, &sr->mc_gregs[PT_MSR]);
785 /* Restore the previous little-endian mode */
786 regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE);
789 * Do this before updating the thread state in
790 * current->thread.fpr/vr/evr. That way, if we get preempted
791 * and another task grabs the FPU/Altivec/SPE, it won't be
792 * tempted to save the current CPU state into the thread_struct
793 * and corrupt what we are writing there.
795 discard_lazy_cpu_state();
797 #ifdef CONFIG_ALTIVEC
798 regs->msr &= ~MSR_VEC;
800 /* restore altivec registers from the stack */
801 if (__copy_from_user(current->thread.vr, &sr->mc_vregs,
802 sizeof(sr->mc_vregs)) ||
803 __copy_from_user(current->thread.transact_vr,
805 sizeof(sr->mc_vregs)))
807 } else if (current->thread.used_vr) {
808 memset(current->thread.vr, 0, ELF_NVRREG * sizeof(vector128));
809 memset(current->thread.transact_vr, 0,
810 ELF_NVRREG * sizeof(vector128));
813 /* Always get VRSAVE back */
814 if (__get_user(current->thread.vrsave,
815 (u32 __user *)&sr->mc_vregs[32]) ||
816 __get_user(current->thread.transact_vrsave,
817 (u32 __user *)&tm_sr->mc_vregs[32]))
819 if (cpu_has_feature(CPU_FTR_ALTIVEC))
820 mtspr(SPRN_VRSAVE, current->thread.vrsave);
821 #endif /* CONFIG_ALTIVEC */
823 regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1);
825 if (copy_fpr_from_user(current, &sr->mc_fregs) ||
826 copy_transact_fpr_from_user(current, &tm_sr->mc_fregs))
830 regs->msr &= ~MSR_VSX;
833 * Restore altivec registers from the stack to a local
834 * buffer, then write this out to the thread_struct
836 if (copy_vsx_from_user(current, &sr->mc_vsregs) ||
837 copy_transact_vsx_from_user(current, &tm_sr->mc_vsregs))
839 } else if (current->thread.used_vsr)
840 for (i = 0; i < 32 ; i++) {
841 current->thread.fpr[i][TS_VSRLOWOFFSET] = 0;
842 current->thread.transact_fpr[i][TS_VSRLOWOFFSET] = 0;
844 #endif /* CONFIG_VSX */
847 /* SPE regs are not checkpointed with TM, so this section is
848 * simply the same as in restore_user_regs().
850 regs->msr &= ~MSR_SPE;
852 if (__copy_from_user(current->thread.evr, &sr->mc_vregs,
853 ELF_NEVRREG * sizeof(u32)))
855 } else if (current->thread.used_spe)
856 memset(current->thread.evr, 0, ELF_NEVRREG * sizeof(u32));
858 /* Always get SPEFSCR back */
859 if (__get_user(current->thread.spefscr, (u32 __user *)&sr->mc_vregs
862 #endif /* CONFIG_SPE */
864 /* Now, recheckpoint. This loads up all of the checkpointed (older)
865 * registers, including FP and V[S]Rs. After recheckpointing, the
866 * transactional versions should be loaded.
869 /* This loads the checkpointed FP/VEC state, if used */
870 tm_recheckpoint(¤t->thread, msr);
871 /* Get the top half of the MSR */
872 if (__get_user(msr_hi, &tm_sr->mc_gregs[PT_MSR]))
874 /* Pull in MSR TM from user context */
875 regs->msr = (regs->msr & ~MSR_TS_MASK) | ((msr_hi<<32) & MSR_TS_MASK);
877 /* This loads the speculative FP/VEC state, if used */
879 do_load_up_transact_fpu(¤t->thread);
880 regs->msr |= (MSR_FP | current->thread.fpexc_mode);
882 #ifdef CONFIG_ALTIVEC
884 do_load_up_transact_altivec(¤t->thread);
885 regs->msr |= MSR_VEC;
894 int copy_siginfo_to_user32(struct compat_siginfo __user *d, siginfo_t *s)
898 if (!access_ok (VERIFY_WRITE, d, sizeof(*d)))
901 /* If you change siginfo_t structure, please be sure
902 * this code is fixed accordingly.
903 * It should never copy any pad contained in the structure
904 * to avoid security leaks, but must copy the generic
905 * 3 ints plus the relevant union member.
906 * This routine must convert siginfo from 64bit to 32bit as well
909 err = __put_user(s->si_signo, &d->si_signo);
910 err |= __put_user(s->si_errno, &d->si_errno);
911 err |= __put_user((short)s->si_code, &d->si_code);
913 err |= __copy_to_user(&d->_sifields._pad, &s->_sifields._pad,
915 else switch(s->si_code >> 16) {
916 case __SI_CHLD >> 16:
917 err |= __put_user(s->si_pid, &d->si_pid);
918 err |= __put_user(s->si_uid, &d->si_uid);
919 err |= __put_user(s->si_utime, &d->si_utime);
920 err |= __put_user(s->si_stime, &d->si_stime);
921 err |= __put_user(s->si_status, &d->si_status);
923 case __SI_FAULT >> 16:
924 err |= __put_user((unsigned int)(unsigned long)s->si_addr,
927 case __SI_POLL >> 16:
928 err |= __put_user(s->si_band, &d->si_band);
929 err |= __put_user(s->si_fd, &d->si_fd);
931 case __SI_TIMER >> 16:
932 err |= __put_user(s->si_tid, &d->si_tid);
933 err |= __put_user(s->si_overrun, &d->si_overrun);
934 err |= __put_user(s->si_int, &d->si_int);
936 case __SI_RT >> 16: /* This is not generated by the kernel as of now. */
937 case __SI_MESGQ >> 16:
938 err |= __put_user(s->si_int, &d->si_int);
940 case __SI_KILL >> 16:
942 err |= __put_user(s->si_pid, &d->si_pid);
943 err |= __put_user(s->si_uid, &d->si_uid);
949 #define copy_siginfo_to_user copy_siginfo_to_user32
951 int copy_siginfo_from_user32(siginfo_t *to, struct compat_siginfo __user *from)
953 memset(to, 0, sizeof *to);
955 if (copy_from_user(to, from, 3*sizeof(int)) ||
956 copy_from_user(to->_sifields._pad,
957 from->_sifields._pad, SI_PAD_SIZE32))
962 #endif /* CONFIG_PPC64 */
965 * Set up a signal frame for a "real-time" signal handler
966 * (one which gets siginfo).
968 int handle_rt_signal32(unsigned long sig, struct k_sigaction *ka,
969 siginfo_t *info, sigset_t *oldset,
970 struct pt_regs *regs)
972 struct rt_sigframe __user *rt_sf;
973 struct mcontext __user *frame;
974 struct mcontext __user *tm_frame = NULL;
976 unsigned long newsp = 0;
980 /* Set up Signal Frame */
981 /* Put a Real Time Context onto stack */
982 rt_sf = get_sigframe(ka, get_tm_stackpointer(regs), sizeof(*rt_sf), 1);
984 if (unlikely(rt_sf == NULL))
987 /* Put the siginfo & fill in most of the ucontext */
988 if (copy_siginfo_to_user(&rt_sf->info, info)
989 || __put_user(0, &rt_sf->uc.uc_flags)
990 || __save_altstack(&rt_sf->uc.uc_stack, regs->gpr[1])
991 || __put_user(to_user_ptr(&rt_sf->uc.uc_mcontext),
993 || put_sigset_t(&rt_sf->uc.uc_sigmask, oldset))
996 /* Save user registers on the stack */
997 frame = &rt_sf->uc.uc_mcontext;
999 if (vdso32_rt_sigtramp && current->mm->context.vdso_base) {
1001 tramp = current->mm->context.vdso_base + vdso32_rt_sigtramp;
1003 sigret = __NR_rt_sigreturn;
1004 tramp = (unsigned long) frame->tramp;
1007 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1008 tm_frame = &rt_sf->uc_transact.uc_mcontext;
1009 if (MSR_TM_ACTIVE(regs->msr)) {
1010 if (save_tm_user_regs(regs, frame, tm_frame, sigret))
1016 if (save_user_regs(regs, frame, tm_frame, sigret, 1))
1021 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1022 if (MSR_TM_ACTIVE(regs->msr)) {
1023 if (__put_user((unsigned long)&rt_sf->uc_transact,
1025 || __put_user((unsigned long)tm_frame, &rt_sf->uc_transact.uc_regs))
1030 if (__put_user(0, &rt_sf->uc.uc_link))
1033 current->thread.fpscr.val = 0; /* turn off all fp exceptions */
1035 /* create a stack frame for the caller of the handler */
1036 newsp = ((unsigned long)rt_sf) - (__SIGNAL_FRAMESIZE + 16);
1037 addr = (void __user *)regs->gpr[1];
1038 if (put_user(regs->gpr[1], (u32 __user *)newsp))
1041 /* Fill registers for signal handler */
1042 regs->gpr[1] = newsp;
1044 regs->gpr[4] = (unsigned long) &rt_sf->info;
1045 regs->gpr[5] = (unsigned long) &rt_sf->uc;
1046 regs->gpr[6] = (unsigned long) rt_sf;
1047 regs->nip = (unsigned long) ka->sa.sa_handler;
1048 /* enter the signal handler in big-endian mode */
1049 regs->msr &= ~MSR_LE;
1050 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1051 /* Remove TM bits from thread's MSR. The MSR in the sigcontext
1052 * just indicates to userland that we were doing a transaction, but we
1053 * don't want to return in transactional state:
1055 regs->msr &= ~MSR_TS_MASK;
1061 printk("badframe in handle_rt_signal, regs=%p frame=%p newsp=%lx\n",
1062 regs, frame, newsp);
1064 if (show_unhandled_signals)
1065 printk_ratelimited(KERN_INFO
1066 "%s[%d]: bad frame in handle_rt_signal32: "
1067 "%p nip %08lx lr %08lx\n",
1068 current->comm, current->pid,
1069 addr, regs->nip, regs->link);
1071 force_sigsegv(sig, current);
1075 static int do_setcontext(struct ucontext __user *ucp, struct pt_regs *regs, int sig)
1078 struct mcontext __user *mcp;
1080 if (get_sigset_t(&set, &ucp->uc_sigmask))
1086 if (__get_user(cmcp, &ucp->uc_regs))
1088 mcp = (struct mcontext __user *)(u64)cmcp;
1089 /* no need to check access_ok(mcp), since mcp < 4GB */
1092 if (__get_user(mcp, &ucp->uc_regs))
1094 if (!access_ok(VERIFY_READ, mcp, sizeof(*mcp)))
1097 set_current_blocked(&set);
1098 if (restore_user_regs(regs, mcp, sig))
1104 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1105 static int do_setcontext_tm(struct ucontext __user *ucp,
1106 struct ucontext __user *tm_ucp,
1107 struct pt_regs *regs)
1110 struct mcontext __user *mcp;
1111 struct mcontext __user *tm_mcp;
1115 if (get_sigset_t(&set, &ucp->uc_sigmask))
1118 if (__get_user(cmcp, &ucp->uc_regs) ||
1119 __get_user(tm_cmcp, &tm_ucp->uc_regs))
1121 mcp = (struct mcontext __user *)(u64)cmcp;
1122 tm_mcp = (struct mcontext __user *)(u64)tm_cmcp;
1123 /* no need to check access_ok(mcp), since mcp < 4GB */
1125 set_current_blocked(&set);
1126 if (restore_tm_user_regs(regs, mcp, tm_mcp))
1133 long sys_swapcontext(struct ucontext __user *old_ctx,
1134 struct ucontext __user *new_ctx,
1135 int ctx_size, int r6, int r7, int r8, struct pt_regs *regs)
1138 int ctx_has_vsx_region = 0;
1141 unsigned long new_msr = 0;
1144 struct mcontext __user *mcp;
1148 * Get pointer to the real mcontext. No need for
1149 * access_ok since we are dealing with compat
1152 if (__get_user(cmcp, &new_ctx->uc_regs))
1154 mcp = (struct mcontext __user *)(u64)cmcp;
1155 if (__get_user(new_msr, &mcp->mc_gregs[PT_MSR]))
1159 * Check that the context is not smaller than the original
1160 * size (with VMX but without VSX)
1162 if (ctx_size < UCONTEXTSIZEWITHOUTVSX)
1165 * If the new context state sets the MSR VSX bits but
1166 * it doesn't provide VSX state.
1168 if ((ctx_size < sizeof(struct ucontext)) &&
1169 (new_msr & MSR_VSX))
1171 /* Does the context have enough room to store VSX data? */
1172 if (ctx_size >= sizeof(struct ucontext))
1173 ctx_has_vsx_region = 1;
1175 /* Context size is for future use. Right now, we only make sure
1176 * we are passed something we understand
1178 if (ctx_size < sizeof(struct ucontext))
1181 if (old_ctx != NULL) {
1182 struct mcontext __user *mctx;
1185 * old_ctx might not be 16-byte aligned, in which
1186 * case old_ctx->uc_mcontext won't be either.
1187 * Because we have the old_ctx->uc_pad2 field
1188 * before old_ctx->uc_mcontext, we need to round down
1189 * from &old_ctx->uc_mcontext to a 16-byte boundary.
1191 mctx = (struct mcontext __user *)
1192 ((unsigned long) &old_ctx->uc_mcontext & ~0xfUL);
1193 if (!access_ok(VERIFY_WRITE, old_ctx, ctx_size)
1194 || save_user_regs(regs, mctx, NULL, 0, ctx_has_vsx_region)
1195 || put_sigset_t(&old_ctx->uc_sigmask, ¤t->blocked)
1196 || __put_user(to_user_ptr(mctx), &old_ctx->uc_regs))
1199 if (new_ctx == NULL)
1201 if (!access_ok(VERIFY_READ, new_ctx, ctx_size)
1202 || __get_user(tmp, (u8 __user *) new_ctx)
1203 || __get_user(tmp, (u8 __user *) new_ctx + ctx_size - 1))
1207 * If we get a fault copying the context into the kernel's
1208 * image of the user's registers, we can't just return -EFAULT
1209 * because the user's registers will be corrupted. For instance
1210 * the NIP value may have been updated but not some of the
1211 * other registers. Given that we have done the access_ok
1212 * and successfully read the first and last bytes of the region
1213 * above, this should only happen in an out-of-memory situation
1214 * or if another thread unmaps the region containing the context.
1215 * We kill the task with a SIGSEGV in this situation.
1217 if (do_setcontext(new_ctx, regs, 0))
1220 set_thread_flag(TIF_RESTOREALL);
1224 long sys_rt_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8,
1225 struct pt_regs *regs)
1227 struct rt_sigframe __user *rt_sf;
1228 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1229 struct ucontext __user *uc_transact;
1230 unsigned long msr_hi;
1234 /* Always make any pending restarted system calls return -EINTR */
1235 current_thread_info()->restart_block.fn = do_no_restart_syscall;
1237 rt_sf = (struct rt_sigframe __user *)
1238 (regs->gpr[1] + __SIGNAL_FRAMESIZE + 16);
1239 if (!access_ok(VERIFY_READ, rt_sf, sizeof(*rt_sf)))
1241 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1242 if (__get_user(tmp, &rt_sf->uc.uc_link))
1244 uc_transact = (struct ucontext __user *)(uintptr_t)tmp;
1247 struct mcontext __user *mcp;
1249 if (__get_user(cmcp, &uc_transact->uc_regs))
1251 mcp = (struct mcontext __user *)(u64)cmcp;
1252 /* The top 32 bits of the MSR are stashed in the transactional
1254 if (__get_user(msr_hi, &mcp->mc_gregs[PT_MSR]))
1257 if (MSR_TM_ACTIVE(msr_hi<<32)) {
1258 /* We only recheckpoint on return if we're
1262 if (do_setcontext_tm(&rt_sf->uc, uc_transact, regs))
1267 /* Fall through, for non-TM restore */
1269 if (do_setcontext(&rt_sf->uc, regs, 1))
1273 * It's not clear whether or why it is desirable to save the
1274 * sigaltstack setting on signal delivery and restore it on
1275 * signal return. But other architectures do this and we have
1276 * always done it up until now so it is probably better not to
1277 * change it. -- paulus
1280 if (compat_restore_altstack(&rt_sf->uc.uc_stack))
1283 if (restore_altstack(&rt_sf->uc.uc_stack))
1286 set_thread_flag(TIF_RESTOREALL);
1290 if (show_unhandled_signals)
1291 printk_ratelimited(KERN_INFO
1292 "%s[%d]: bad frame in sys_rt_sigreturn: "
1293 "%p nip %08lx lr %08lx\n",
1294 current->comm, current->pid,
1295 rt_sf, regs->nip, regs->link);
1297 force_sig(SIGSEGV, current);
1302 int sys_debug_setcontext(struct ucontext __user *ctx,
1303 int ndbg, struct sig_dbg_op __user *dbg,
1304 int r6, int r7, int r8,
1305 struct pt_regs *regs)
1307 struct sig_dbg_op op;
1310 unsigned long new_msr = regs->msr;
1311 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
1312 unsigned long new_dbcr0 = current->thread.dbcr0;
1315 for (i=0; i<ndbg; i++) {
1316 if (copy_from_user(&op, dbg + i, sizeof(op)))
1318 switch (op.dbg_type) {
1319 case SIG_DBG_SINGLE_STEPPING:
1320 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
1323 new_dbcr0 |= (DBCR0_IDM | DBCR0_IC);
1325 new_dbcr0 &= ~DBCR0_IC;
1326 if (!DBCR_ACTIVE_EVENTS(new_dbcr0,
1327 current->thread.dbcr1)) {
1329 new_dbcr0 &= ~DBCR0_IDM;
1339 case SIG_DBG_BRANCH_TRACING:
1340 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
1355 /* We wait until here to actually install the values in the
1356 registers so if we fail in the above loop, it will not
1357 affect the contents of these registers. After this point,
1358 failure is a problem, anyway, and it's very unlikely unless
1359 the user is really doing something wrong. */
1360 regs->msr = new_msr;
1361 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
1362 current->thread.dbcr0 = new_dbcr0;
1365 if (!access_ok(VERIFY_READ, ctx, sizeof(*ctx))
1366 || __get_user(tmp, (u8 __user *) ctx)
1367 || __get_user(tmp, (u8 __user *) (ctx + 1) - 1))
1371 * If we get a fault copying the context into the kernel's
1372 * image of the user's registers, we can't just return -EFAULT
1373 * because the user's registers will be corrupted. For instance
1374 * the NIP value may have been updated but not some of the
1375 * other registers. Given that we have done the access_ok
1376 * and successfully read the first and last bytes of the region
1377 * above, this should only happen in an out-of-memory situation
1378 * or if another thread unmaps the region containing the context.
1379 * We kill the task with a SIGSEGV in this situation.
1381 if (do_setcontext(ctx, regs, 1)) {
1382 if (show_unhandled_signals)
1383 printk_ratelimited(KERN_INFO "%s[%d]: bad frame in "
1384 "sys_debug_setcontext: %p nip %08lx "
1386 current->comm, current->pid,
1387 ctx, regs->nip, regs->link);
1389 force_sig(SIGSEGV, current);
1394 * It's not clear whether or why it is desirable to save the
1395 * sigaltstack setting on signal delivery and restore it on
1396 * signal return. But other architectures do this and we have
1397 * always done it up until now so it is probably better not to
1398 * change it. -- paulus
1400 restore_altstack(&ctx->uc_stack);
1402 set_thread_flag(TIF_RESTOREALL);
1409 * OK, we're invoking a handler
1411 int handle_signal32(unsigned long sig, struct k_sigaction *ka,
1412 siginfo_t *info, sigset_t *oldset, struct pt_regs *regs)
1414 struct sigcontext __user *sc;
1415 struct sigframe __user *frame;
1416 struct mcontext __user *tm_mctx = NULL;
1417 unsigned long newsp = 0;
1419 unsigned long tramp;
1421 /* Set up Signal Frame */
1422 frame = get_sigframe(ka, get_tm_stackpointer(regs), sizeof(*frame), 1);
1423 if (unlikely(frame == NULL))
1425 sc = (struct sigcontext __user *) &frame->sctx;
1428 #error "Please adjust handle_signal()"
1430 if (__put_user(to_user_ptr(ka->sa.sa_handler), &sc->handler)
1431 || __put_user(oldset->sig[0], &sc->oldmask)
1433 || __put_user((oldset->sig[0] >> 32), &sc->_unused[3])
1435 || __put_user(oldset->sig[1], &sc->_unused[3])
1437 || __put_user(to_user_ptr(&frame->mctx), &sc->regs)
1438 || __put_user(sig, &sc->signal))
1441 if (vdso32_sigtramp && current->mm->context.vdso_base) {
1443 tramp = current->mm->context.vdso_base + vdso32_sigtramp;
1445 sigret = __NR_sigreturn;
1446 tramp = (unsigned long) frame->mctx.tramp;
1449 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1450 tm_mctx = &frame->mctx_transact;
1451 if (MSR_TM_ACTIVE(regs->msr)) {
1452 if (save_tm_user_regs(regs, &frame->mctx, &frame->mctx_transact,
1459 if (save_user_regs(regs, &frame->mctx, tm_mctx, sigret, 1))
1465 current->thread.fpscr.val = 0; /* turn off all fp exceptions */
1467 /* create a stack frame for the caller of the handler */
1468 newsp = ((unsigned long)frame) - __SIGNAL_FRAMESIZE;
1469 if (put_user(regs->gpr[1], (u32 __user *)newsp))
1472 regs->gpr[1] = newsp;
1474 regs->gpr[4] = (unsigned long) sc;
1475 regs->nip = (unsigned long) ka->sa.sa_handler;
1476 /* enter the signal handler in big-endian mode */
1477 regs->msr &= ~MSR_LE;
1478 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1479 /* Remove TM bits from thread's MSR. The MSR in the sigcontext
1480 * just indicates to userland that we were doing a transaction, but we
1481 * don't want to return in transactional state:
1483 regs->msr &= ~MSR_TS_MASK;
1489 printk("badframe in handle_signal, regs=%p frame=%p newsp=%lx\n",
1490 regs, frame, newsp);
1492 if (show_unhandled_signals)
1493 printk_ratelimited(KERN_INFO
1494 "%s[%d]: bad frame in handle_signal32: "
1495 "%p nip %08lx lr %08lx\n",
1496 current->comm, current->pid,
1497 frame, regs->nip, regs->link);
1499 force_sigsegv(sig, current);
1504 * Do a signal return; undo the signal stack.
1506 long sys_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8,
1507 struct pt_regs *regs)
1509 struct sigframe __user *sf;
1510 struct sigcontext __user *sc;
1511 struct sigcontext sigctx;
1512 struct mcontext __user *sr;
1515 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1516 struct mcontext __user *mcp, *tm_mcp;
1517 unsigned long msr_hi;
1520 /* Always make any pending restarted system calls return -EINTR */
1521 current_thread_info()->restart_block.fn = do_no_restart_syscall;
1523 sf = (struct sigframe __user *)(regs->gpr[1] + __SIGNAL_FRAMESIZE);
1526 if (copy_from_user(&sigctx, sc, sizeof(sigctx)))
1531 * Note that PPC32 puts the upper 32 bits of the sigmask in the
1532 * unused part of the signal stackframe
1534 set.sig[0] = sigctx.oldmask + ((long)(sigctx._unused[3]) << 32);
1536 set.sig[0] = sigctx.oldmask;
1537 set.sig[1] = sigctx._unused[3];
1539 set_current_blocked(&set);
1541 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1542 mcp = (struct mcontext __user *)&sf->mctx;
1543 tm_mcp = (struct mcontext __user *)&sf->mctx_transact;
1544 if (__get_user(msr_hi, &tm_mcp->mc_gregs[PT_MSR]))
1546 if (MSR_TM_ACTIVE(msr_hi<<32)) {
1547 if (!cpu_has_feature(CPU_FTR_TM))
1549 if (restore_tm_user_regs(regs, mcp, tm_mcp))
1554 sr = (struct mcontext __user *)from_user_ptr(sigctx.regs);
1556 if (!access_ok(VERIFY_READ, sr, sizeof(*sr))
1557 || restore_user_regs(regs, sr, 1))
1561 set_thread_flag(TIF_RESTOREALL);
1565 if (show_unhandled_signals)
1566 printk_ratelimited(KERN_INFO
1567 "%s[%d]: bad frame in sys_sigreturn: "
1568 "%p nip %08lx lr %08lx\n",
1569 current->comm, current->pid,
1570 addr, regs->nip, regs->link);
1572 force_sig(SIGSEGV, current);