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)
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 buf[i] = task->thread.fp_state.fpscr;
275 return __copy_to_user(to, buf, ELF_NFPREG * sizeof(double));
278 unsigned long copy_fpr_from_user(struct task_struct *task,
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 task->thread.fp_state.fpscr = buf[i];
293 unsigned long copy_vsx_to_user(void __user *to,
294 struct task_struct *task)
296 u64 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.fp_state.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 u64 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.fp_state.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)
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 buf[i] = task->thread.transact_fp.fpscr;
329 return __copy_to_user(to, buf, ELF_NFPREG * sizeof(double));
332 unsigned long copy_transact_fpr_from_user(struct task_struct *task,
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 task->thread.transact_fp.fpscr = buf[i];
347 unsigned long copy_transact_vsx_to_user(void __user *to,
348 struct task_struct *task)
350 u64 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_fp.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 u64 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_fp.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.fp_state.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.fp_state.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_fp.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_fp.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, ¤t->thread.vr_state,
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, ¤t->thread.vr_state,
538 ELF_NVRREG * sizeof(vector128)))
541 if (__copy_to_user(&tm_frame->mc_vregs,
542 ¤t->thread.transact_vr,
543 ELF_NVRREG * sizeof(vector128)))
546 if (__copy_to_user(&tm_frame->mc_vregs,
547 ¤t->thread.vr_state,
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(¤t->thread.vr_state, &sr->mc_vregs,
696 sizeof(sr->mc_vregs)))
698 } else if (current->thread.used_vr)
699 memset(¤t->thread.vr_state, 0,
700 ELF_NVRREG * sizeof(vector128));
702 /* Always get VRSAVE back */
703 if (__get_user(current->thread.vrsave, (u32 __user *)&sr->mc_vregs[32]))
705 if (cpu_has_feature(CPU_FTR_ALTIVEC))
706 mtspr(SPRN_VRSAVE, current->thread.vrsave);
707 #endif /* CONFIG_ALTIVEC */
708 if (copy_fpr_from_user(current, &sr->mc_fregs))
713 * Force the process to reload the VSX registers from
714 * current->thread when it next does VSX instruction.
716 regs->msr &= ~MSR_VSX;
719 * Restore altivec registers from the stack to a local
720 * buffer, then write this out to the thread_struct
722 if (copy_vsx_from_user(current, &sr->mc_vsregs))
724 } else if (current->thread.used_vsr)
725 for (i = 0; i < 32 ; i++)
726 current->thread.fp_state.fpr[i][TS_VSRLOWOFFSET] = 0;
727 #endif /* CONFIG_VSX */
729 * force the process to reload the FP registers from
730 * current->thread when it next does FP instructions
732 regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1);
735 /* force the process to reload the spe registers from
736 current->thread when it next does spe instructions */
737 regs->msr &= ~MSR_SPE;
739 /* restore spe registers from the stack */
740 if (__copy_from_user(current->thread.evr, &sr->mc_vregs,
741 ELF_NEVRREG * sizeof(u32)))
743 } else if (current->thread.used_spe)
744 memset(current->thread.evr, 0, ELF_NEVRREG * sizeof(u32));
746 /* Always get SPEFSCR back */
747 if (__get_user(current->thread.spefscr, (u32 __user *)&sr->mc_vregs + ELF_NEVRREG))
749 #endif /* CONFIG_SPE */
754 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
756 * Restore the current user register values from the user stack, except for
757 * MSR, and recheckpoint the original checkpointed register state for processes
760 static long restore_tm_user_regs(struct pt_regs *regs,
761 struct mcontext __user *sr,
762 struct mcontext __user *tm_sr)
765 unsigned long msr, msr_hi;
771 * restore general registers but not including MSR or SOFTE. Also
772 * take care of keeping r2 (TLS) intact if not a signal.
773 * See comment in signal_64.c:restore_tm_sigcontexts();
774 * TFHAR is restored from the checkpointed NIP; TEXASR and TFIAR
775 * were set by the signal delivery.
777 err = restore_general_regs(regs, tm_sr);
778 err |= restore_general_regs(¤t->thread.ckpt_regs, sr);
780 err |= __get_user(current->thread.tm_tfhar, &sr->mc_gregs[PT_NIP]);
782 err |= __get_user(msr, &sr->mc_gregs[PT_MSR]);
786 /* Restore the previous little-endian mode */
787 regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE);
790 * Do this before updating the thread state in
791 * current->thread.fpr/vr/evr. That way, if we get preempted
792 * and another task grabs the FPU/Altivec/SPE, it won't be
793 * tempted to save the current CPU state into the thread_struct
794 * and corrupt what we are writing there.
796 discard_lazy_cpu_state();
798 #ifdef CONFIG_ALTIVEC
799 regs->msr &= ~MSR_VEC;
801 /* restore altivec registers from the stack */
802 if (__copy_from_user(¤t->thread.vr_state, &sr->mc_vregs,
803 sizeof(sr->mc_vregs)) ||
804 __copy_from_user(¤t->thread.transact_vr,
806 sizeof(sr->mc_vregs)))
808 } else if (current->thread.used_vr) {
809 memset(¤t->thread.vr_state, 0,
810 ELF_NVRREG * sizeof(vector128));
811 memset(¤t->thread.transact_vr, 0,
812 ELF_NVRREG * sizeof(vector128));
815 /* Always get VRSAVE back */
816 if (__get_user(current->thread.vrsave,
817 (u32 __user *)&sr->mc_vregs[32]) ||
818 __get_user(current->thread.transact_vrsave,
819 (u32 __user *)&tm_sr->mc_vregs[32]))
821 if (cpu_has_feature(CPU_FTR_ALTIVEC))
822 mtspr(SPRN_VRSAVE, current->thread.vrsave);
823 #endif /* CONFIG_ALTIVEC */
825 regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1);
827 if (copy_fpr_from_user(current, &sr->mc_fregs) ||
828 copy_transact_fpr_from_user(current, &tm_sr->mc_fregs))
832 regs->msr &= ~MSR_VSX;
835 * Restore altivec registers from the stack to a local
836 * buffer, then write this out to the thread_struct
838 if (copy_vsx_from_user(current, &sr->mc_vsregs) ||
839 copy_transact_vsx_from_user(current, &tm_sr->mc_vsregs))
841 } else if (current->thread.used_vsr)
842 for (i = 0; i < 32 ; i++) {
843 current->thread.fp_state.fpr[i][TS_VSRLOWOFFSET] = 0;
844 current->thread.transact_fp.fpr[i][TS_VSRLOWOFFSET] = 0;
846 #endif /* CONFIG_VSX */
849 /* SPE regs are not checkpointed with TM, so this section is
850 * simply the same as in restore_user_regs().
852 regs->msr &= ~MSR_SPE;
854 if (__copy_from_user(current->thread.evr, &sr->mc_vregs,
855 ELF_NEVRREG * sizeof(u32)))
857 } else if (current->thread.used_spe)
858 memset(current->thread.evr, 0, ELF_NEVRREG * sizeof(u32));
860 /* Always get SPEFSCR back */
861 if (__get_user(current->thread.spefscr, (u32 __user *)&sr->mc_vregs
864 #endif /* CONFIG_SPE */
866 /* Now, recheckpoint. This loads up all of the checkpointed (older)
867 * registers, including FP and V[S]Rs. After recheckpointing, the
868 * transactional versions should be loaded.
871 /* This loads the checkpointed FP/VEC state, if used */
872 tm_recheckpoint(¤t->thread, msr);
873 /* Get the top half of the MSR */
874 if (__get_user(msr_hi, &tm_sr->mc_gregs[PT_MSR]))
876 /* Pull in MSR TM from user context */
877 regs->msr = (regs->msr & ~MSR_TS_MASK) | ((msr_hi<<32) & MSR_TS_MASK);
879 /* This loads the speculative FP/VEC state, if used */
881 do_load_up_transact_fpu(¤t->thread);
882 regs->msr |= (MSR_FP | current->thread.fpexc_mode);
884 #ifdef CONFIG_ALTIVEC
886 do_load_up_transact_altivec(¤t->thread);
887 regs->msr |= MSR_VEC;
896 int copy_siginfo_to_user32(struct compat_siginfo __user *d, const siginfo_t *s)
900 if (!access_ok (VERIFY_WRITE, d, sizeof(*d)))
903 /* If you change siginfo_t structure, please be sure
904 * this code is fixed accordingly.
905 * It should never copy any pad contained in the structure
906 * to avoid security leaks, but must copy the generic
907 * 3 ints plus the relevant union member.
908 * This routine must convert siginfo from 64bit to 32bit as well
911 err = __put_user(s->si_signo, &d->si_signo);
912 err |= __put_user(s->si_errno, &d->si_errno);
913 err |= __put_user((short)s->si_code, &d->si_code);
915 err |= __copy_to_user(&d->_sifields._pad, &s->_sifields._pad,
917 else switch(s->si_code >> 16) {
918 case __SI_CHLD >> 16:
919 err |= __put_user(s->si_pid, &d->si_pid);
920 err |= __put_user(s->si_uid, &d->si_uid);
921 err |= __put_user(s->si_utime, &d->si_utime);
922 err |= __put_user(s->si_stime, &d->si_stime);
923 err |= __put_user(s->si_status, &d->si_status);
925 case __SI_FAULT >> 16:
926 err |= __put_user((unsigned int)(unsigned long)s->si_addr,
929 case __SI_POLL >> 16:
930 err |= __put_user(s->si_band, &d->si_band);
931 err |= __put_user(s->si_fd, &d->si_fd);
933 case __SI_TIMER >> 16:
934 err |= __put_user(s->si_tid, &d->si_tid);
935 err |= __put_user(s->si_overrun, &d->si_overrun);
936 err |= __put_user(s->si_int, &d->si_int);
938 case __SI_RT >> 16: /* This is not generated by the kernel as of now. */
939 case __SI_MESGQ >> 16:
940 err |= __put_user(s->si_int, &d->si_int);
942 case __SI_KILL >> 16:
944 err |= __put_user(s->si_pid, &d->si_pid);
945 err |= __put_user(s->si_uid, &d->si_uid);
951 #define copy_siginfo_to_user copy_siginfo_to_user32
953 int copy_siginfo_from_user32(siginfo_t *to, struct compat_siginfo __user *from)
955 memset(to, 0, sizeof *to);
957 if (copy_from_user(to, from, 3*sizeof(int)) ||
958 copy_from_user(to->_sifields._pad,
959 from->_sifields._pad, SI_PAD_SIZE32))
964 #endif /* CONFIG_PPC64 */
967 * Set up a signal frame for a "real-time" signal handler
968 * (one which gets siginfo).
970 int handle_rt_signal32(unsigned long sig, struct k_sigaction *ka,
971 siginfo_t *info, sigset_t *oldset,
972 struct pt_regs *regs)
974 struct rt_sigframe __user *rt_sf;
975 struct mcontext __user *frame;
976 struct mcontext __user *tm_frame = NULL;
978 unsigned long newsp = 0;
982 /* Set up Signal Frame */
983 /* Put a Real Time Context onto stack */
984 rt_sf = get_sigframe(ka, get_tm_stackpointer(regs), sizeof(*rt_sf), 1);
986 if (unlikely(rt_sf == NULL))
989 /* Put the siginfo & fill in most of the ucontext */
990 if (copy_siginfo_to_user(&rt_sf->info, info)
991 || __put_user(0, &rt_sf->uc.uc_flags)
992 || __save_altstack(&rt_sf->uc.uc_stack, regs->gpr[1])
993 || __put_user(to_user_ptr(&rt_sf->uc.uc_mcontext),
995 || put_sigset_t(&rt_sf->uc.uc_sigmask, oldset))
998 /* Save user registers on the stack */
999 frame = &rt_sf->uc.uc_mcontext;
1001 if (vdso32_rt_sigtramp && current->mm->context.vdso_base) {
1003 tramp = current->mm->context.vdso_base + vdso32_rt_sigtramp;
1005 sigret = __NR_rt_sigreturn;
1006 tramp = (unsigned long) frame->tramp;
1009 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1010 tm_frame = &rt_sf->uc_transact.uc_mcontext;
1011 if (MSR_TM_ACTIVE(regs->msr)) {
1012 if (save_tm_user_regs(regs, frame, tm_frame, sigret))
1018 if (save_user_regs(regs, frame, tm_frame, sigret, 1))
1023 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1024 if (MSR_TM_ACTIVE(regs->msr)) {
1025 if (__put_user((unsigned long)&rt_sf->uc_transact,
1027 || __put_user((unsigned long)tm_frame, &rt_sf->uc_transact.uc_regs))
1032 if (__put_user(0, &rt_sf->uc.uc_link))
1035 current->thread.fp_state.fpscr = 0; /* turn off all fp exceptions */
1037 /* create a stack frame for the caller of the handler */
1038 newsp = ((unsigned long)rt_sf) - (__SIGNAL_FRAMESIZE + 16);
1039 addr = (void __user *)regs->gpr[1];
1040 if (put_user(regs->gpr[1], (u32 __user *)newsp))
1043 /* Fill registers for signal handler */
1044 regs->gpr[1] = newsp;
1046 regs->gpr[4] = (unsigned long) &rt_sf->info;
1047 regs->gpr[5] = (unsigned long) &rt_sf->uc;
1048 regs->gpr[6] = (unsigned long) rt_sf;
1049 regs->nip = (unsigned long) ka->sa.sa_handler;
1050 /* enter the signal handler in native-endian mode */
1051 regs->msr &= ~MSR_LE;
1052 regs->msr |= (MSR_KERNEL & MSR_LE);
1053 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1054 /* Remove TM bits from thread's MSR. The MSR in the sigcontext
1055 * just indicates to userland that we were doing a transaction, but we
1056 * don't want to return in transactional state:
1058 regs->msr &= ~MSR_TS_MASK;
1064 printk("badframe in handle_rt_signal, regs=%p frame=%p newsp=%lx\n",
1065 regs, frame, newsp);
1067 if (show_unhandled_signals)
1068 printk_ratelimited(KERN_INFO
1069 "%s[%d]: bad frame in handle_rt_signal32: "
1070 "%p nip %08lx lr %08lx\n",
1071 current->comm, current->pid,
1072 addr, regs->nip, regs->link);
1074 force_sigsegv(sig, current);
1078 static int do_setcontext(struct ucontext __user *ucp, struct pt_regs *regs, int sig)
1081 struct mcontext __user *mcp;
1083 if (get_sigset_t(&set, &ucp->uc_sigmask))
1089 if (__get_user(cmcp, &ucp->uc_regs))
1091 mcp = (struct mcontext __user *)(u64)cmcp;
1092 /* no need to check access_ok(mcp), since mcp < 4GB */
1095 if (__get_user(mcp, &ucp->uc_regs))
1097 if (!access_ok(VERIFY_READ, mcp, sizeof(*mcp)))
1100 set_current_blocked(&set);
1101 if (restore_user_regs(regs, mcp, sig))
1107 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1108 static int do_setcontext_tm(struct ucontext __user *ucp,
1109 struct ucontext __user *tm_ucp,
1110 struct pt_regs *regs)
1113 struct mcontext __user *mcp;
1114 struct mcontext __user *tm_mcp;
1118 if (get_sigset_t(&set, &ucp->uc_sigmask))
1121 if (__get_user(cmcp, &ucp->uc_regs) ||
1122 __get_user(tm_cmcp, &tm_ucp->uc_regs))
1124 mcp = (struct mcontext __user *)(u64)cmcp;
1125 tm_mcp = (struct mcontext __user *)(u64)tm_cmcp;
1126 /* no need to check access_ok(mcp), since mcp < 4GB */
1128 set_current_blocked(&set);
1129 if (restore_tm_user_regs(regs, mcp, tm_mcp))
1136 long sys_swapcontext(struct ucontext __user *old_ctx,
1137 struct ucontext __user *new_ctx,
1138 int ctx_size, int r6, int r7, int r8, struct pt_regs *regs)
1141 int ctx_has_vsx_region = 0;
1144 unsigned long new_msr = 0;
1147 struct mcontext __user *mcp;
1151 * Get pointer to the real mcontext. No need for
1152 * access_ok since we are dealing with compat
1155 if (__get_user(cmcp, &new_ctx->uc_regs))
1157 mcp = (struct mcontext __user *)(u64)cmcp;
1158 if (__get_user(new_msr, &mcp->mc_gregs[PT_MSR]))
1162 * Check that the context is not smaller than the original
1163 * size (with VMX but without VSX)
1165 if (ctx_size < UCONTEXTSIZEWITHOUTVSX)
1168 * If the new context state sets the MSR VSX bits but
1169 * it doesn't provide VSX state.
1171 if ((ctx_size < sizeof(struct ucontext)) &&
1172 (new_msr & MSR_VSX))
1174 /* Does the context have enough room to store VSX data? */
1175 if (ctx_size >= sizeof(struct ucontext))
1176 ctx_has_vsx_region = 1;
1178 /* Context size is for future use. Right now, we only make sure
1179 * we are passed something we understand
1181 if (ctx_size < sizeof(struct ucontext))
1184 if (old_ctx != NULL) {
1185 struct mcontext __user *mctx;
1188 * old_ctx might not be 16-byte aligned, in which
1189 * case old_ctx->uc_mcontext won't be either.
1190 * Because we have the old_ctx->uc_pad2 field
1191 * before old_ctx->uc_mcontext, we need to round down
1192 * from &old_ctx->uc_mcontext to a 16-byte boundary.
1194 mctx = (struct mcontext __user *)
1195 ((unsigned long) &old_ctx->uc_mcontext & ~0xfUL);
1196 if (!access_ok(VERIFY_WRITE, old_ctx, ctx_size)
1197 || save_user_regs(regs, mctx, NULL, 0, ctx_has_vsx_region)
1198 || put_sigset_t(&old_ctx->uc_sigmask, ¤t->blocked)
1199 || __put_user(to_user_ptr(mctx), &old_ctx->uc_regs))
1202 if (new_ctx == NULL)
1204 if (!access_ok(VERIFY_READ, new_ctx, ctx_size)
1205 || __get_user(tmp, (u8 __user *) new_ctx)
1206 || __get_user(tmp, (u8 __user *) new_ctx + ctx_size - 1))
1210 * If we get a fault copying the context into the kernel's
1211 * image of the user's registers, we can't just return -EFAULT
1212 * because the user's registers will be corrupted. For instance
1213 * the NIP value may have been updated but not some of the
1214 * other registers. Given that we have done the access_ok
1215 * and successfully read the first and last bytes of the region
1216 * above, this should only happen in an out-of-memory situation
1217 * or if another thread unmaps the region containing the context.
1218 * We kill the task with a SIGSEGV in this situation.
1220 if (do_setcontext(new_ctx, regs, 0))
1223 set_thread_flag(TIF_RESTOREALL);
1227 long sys_rt_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8,
1228 struct pt_regs *regs)
1230 struct rt_sigframe __user *rt_sf;
1231 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1232 struct ucontext __user *uc_transact;
1233 unsigned long msr_hi;
1237 /* Always make any pending restarted system calls return -EINTR */
1238 current_thread_info()->restart_block.fn = do_no_restart_syscall;
1240 rt_sf = (struct rt_sigframe __user *)
1241 (regs->gpr[1] + __SIGNAL_FRAMESIZE + 16);
1242 if (!access_ok(VERIFY_READ, rt_sf, sizeof(*rt_sf)))
1244 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1245 if (__get_user(tmp, &rt_sf->uc.uc_link))
1247 uc_transact = (struct ucontext __user *)(uintptr_t)tmp;
1250 struct mcontext __user *mcp;
1252 if (__get_user(cmcp, &uc_transact->uc_regs))
1254 mcp = (struct mcontext __user *)(u64)cmcp;
1255 /* The top 32 bits of the MSR are stashed in the transactional
1257 if (__get_user(msr_hi, &mcp->mc_gregs[PT_MSR]))
1260 if (MSR_TM_ACTIVE(msr_hi<<32)) {
1261 /* We only recheckpoint on return if we're
1265 if (do_setcontext_tm(&rt_sf->uc, uc_transact, regs))
1270 /* Fall through, for non-TM restore */
1272 if (do_setcontext(&rt_sf->uc, regs, 1))
1276 * It's not clear whether or why it is desirable to save the
1277 * sigaltstack setting on signal delivery and restore it on
1278 * signal return. But other architectures do this and we have
1279 * always done it up until now so it is probably better not to
1280 * change it. -- paulus
1283 if (compat_restore_altstack(&rt_sf->uc.uc_stack))
1286 if (restore_altstack(&rt_sf->uc.uc_stack))
1289 set_thread_flag(TIF_RESTOREALL);
1293 if (show_unhandled_signals)
1294 printk_ratelimited(KERN_INFO
1295 "%s[%d]: bad frame in sys_rt_sigreturn: "
1296 "%p nip %08lx lr %08lx\n",
1297 current->comm, current->pid,
1298 rt_sf, regs->nip, regs->link);
1300 force_sig(SIGSEGV, current);
1305 int sys_debug_setcontext(struct ucontext __user *ctx,
1306 int ndbg, struct sig_dbg_op __user *dbg,
1307 int r6, int r7, int r8,
1308 struct pt_regs *regs)
1310 struct sig_dbg_op op;
1313 unsigned long new_msr = regs->msr;
1314 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
1315 unsigned long new_dbcr0 = current->thread.debug.dbcr0;
1318 for (i=0; i<ndbg; i++) {
1319 if (copy_from_user(&op, dbg + i, sizeof(op)))
1321 switch (op.dbg_type) {
1322 case SIG_DBG_SINGLE_STEPPING:
1323 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
1326 new_dbcr0 |= (DBCR0_IDM | DBCR0_IC);
1328 new_dbcr0 &= ~DBCR0_IC;
1329 if (!DBCR_ACTIVE_EVENTS(new_dbcr0,
1330 current->thread.debug.dbcr1)) {
1332 new_dbcr0 &= ~DBCR0_IDM;
1342 case SIG_DBG_BRANCH_TRACING:
1343 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
1358 /* We wait until here to actually install the values in the
1359 registers so if we fail in the above loop, it will not
1360 affect the contents of these registers. After this point,
1361 failure is a problem, anyway, and it's very unlikely unless
1362 the user is really doing something wrong. */
1363 regs->msr = new_msr;
1364 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
1365 current->thread.debug.dbcr0 = new_dbcr0;
1368 if (!access_ok(VERIFY_READ, ctx, sizeof(*ctx))
1369 || __get_user(tmp, (u8 __user *) ctx)
1370 || __get_user(tmp, (u8 __user *) (ctx + 1) - 1))
1374 * If we get a fault copying the context into the kernel's
1375 * image of the user's registers, we can't just return -EFAULT
1376 * because the user's registers will be corrupted. For instance
1377 * the NIP value may have been updated but not some of the
1378 * other registers. Given that we have done the access_ok
1379 * and successfully read the first and last bytes of the region
1380 * above, this should only happen in an out-of-memory situation
1381 * or if another thread unmaps the region containing the context.
1382 * We kill the task with a SIGSEGV in this situation.
1384 if (do_setcontext(ctx, regs, 1)) {
1385 if (show_unhandled_signals)
1386 printk_ratelimited(KERN_INFO "%s[%d]: bad frame in "
1387 "sys_debug_setcontext: %p nip %08lx "
1389 current->comm, current->pid,
1390 ctx, regs->nip, regs->link);
1392 force_sig(SIGSEGV, current);
1397 * It's not clear whether or why it is desirable to save the
1398 * sigaltstack setting on signal delivery and restore it on
1399 * signal return. But other architectures do this and we have
1400 * always done it up until now so it is probably better not to
1401 * change it. -- paulus
1403 restore_altstack(&ctx->uc_stack);
1405 set_thread_flag(TIF_RESTOREALL);
1412 * OK, we're invoking a handler
1414 int handle_signal32(unsigned long sig, struct k_sigaction *ka,
1415 siginfo_t *info, sigset_t *oldset, struct pt_regs *regs)
1417 struct sigcontext __user *sc;
1418 struct sigframe __user *frame;
1419 struct mcontext __user *tm_mctx = NULL;
1420 unsigned long newsp = 0;
1422 unsigned long tramp;
1424 /* Set up Signal Frame */
1425 frame = get_sigframe(ka, get_tm_stackpointer(regs), sizeof(*frame), 1);
1426 if (unlikely(frame == NULL))
1428 sc = (struct sigcontext __user *) &frame->sctx;
1431 #error "Please adjust handle_signal()"
1433 if (__put_user(to_user_ptr(ka->sa.sa_handler), &sc->handler)
1434 || __put_user(oldset->sig[0], &sc->oldmask)
1436 || __put_user((oldset->sig[0] >> 32), &sc->_unused[3])
1438 || __put_user(oldset->sig[1], &sc->_unused[3])
1440 || __put_user(to_user_ptr(&frame->mctx), &sc->regs)
1441 || __put_user(sig, &sc->signal))
1444 if (vdso32_sigtramp && current->mm->context.vdso_base) {
1446 tramp = current->mm->context.vdso_base + vdso32_sigtramp;
1448 sigret = __NR_sigreturn;
1449 tramp = (unsigned long) frame->mctx.tramp;
1452 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1453 tm_mctx = &frame->mctx_transact;
1454 if (MSR_TM_ACTIVE(regs->msr)) {
1455 if (save_tm_user_regs(regs, &frame->mctx, &frame->mctx_transact,
1462 if (save_user_regs(regs, &frame->mctx, tm_mctx, sigret, 1))
1468 current->thread.fp_state.fpscr = 0; /* turn off all fp exceptions */
1470 /* create a stack frame for the caller of the handler */
1471 newsp = ((unsigned long)frame) - __SIGNAL_FRAMESIZE;
1472 if (put_user(regs->gpr[1], (u32 __user *)newsp))
1475 regs->gpr[1] = newsp;
1477 regs->gpr[4] = (unsigned long) sc;
1478 regs->nip = (unsigned long) ka->sa.sa_handler;
1479 /* enter the signal handler in big-endian mode */
1480 regs->msr &= ~MSR_LE;
1481 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1482 /* Remove TM bits from thread's MSR. The MSR in the sigcontext
1483 * just indicates to userland that we were doing a transaction, but we
1484 * don't want to return in transactional state:
1486 regs->msr &= ~MSR_TS_MASK;
1492 printk("badframe in handle_signal, regs=%p frame=%p newsp=%lx\n",
1493 regs, frame, newsp);
1495 if (show_unhandled_signals)
1496 printk_ratelimited(KERN_INFO
1497 "%s[%d]: bad frame in handle_signal32: "
1498 "%p nip %08lx lr %08lx\n",
1499 current->comm, current->pid,
1500 frame, regs->nip, regs->link);
1502 force_sigsegv(sig, current);
1507 * Do a signal return; undo the signal stack.
1509 long sys_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8,
1510 struct pt_regs *regs)
1512 struct sigframe __user *sf;
1513 struct sigcontext __user *sc;
1514 struct sigcontext sigctx;
1515 struct mcontext __user *sr;
1518 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1519 struct mcontext __user *mcp, *tm_mcp;
1520 unsigned long msr_hi;
1523 /* Always make any pending restarted system calls return -EINTR */
1524 current_thread_info()->restart_block.fn = do_no_restart_syscall;
1526 sf = (struct sigframe __user *)(regs->gpr[1] + __SIGNAL_FRAMESIZE);
1529 if (copy_from_user(&sigctx, sc, sizeof(sigctx)))
1534 * Note that PPC32 puts the upper 32 bits of the sigmask in the
1535 * unused part of the signal stackframe
1537 set.sig[0] = sigctx.oldmask + ((long)(sigctx._unused[3]) << 32);
1539 set.sig[0] = sigctx.oldmask;
1540 set.sig[1] = sigctx._unused[3];
1542 set_current_blocked(&set);
1544 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1545 mcp = (struct mcontext __user *)&sf->mctx;
1546 tm_mcp = (struct mcontext __user *)&sf->mctx_transact;
1547 if (__get_user(msr_hi, &tm_mcp->mc_gregs[PT_MSR]))
1549 if (MSR_TM_ACTIVE(msr_hi<<32)) {
1550 if (!cpu_has_feature(CPU_FTR_TM))
1552 if (restore_tm_user_regs(regs, mcp, tm_mcp))
1557 sr = (struct mcontext __user *)from_user_ptr(sigctx.regs);
1559 if (!access_ok(VERIFY_READ, sr, sizeof(*sr))
1560 || restore_user_regs(regs, sr, 1))
1564 set_thread_flag(TIF_RESTOREALL);
1568 if (show_unhandled_signals)
1569 printk_ratelimited(KERN_INFO
1570 "%s[%d]: bad frame in sys_sigreturn: "
1571 "%p nip %08lx lr %08lx\n",
1572 current->comm, current->pid,
1573 addr, regs->nip, regs->link);
1575 force_sig(SIGSEGV, current);