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>
47 #include <asm/asm-prototypes.h>
50 #include <asm/unistd.h>
52 #include <asm/ucontext.h>
53 #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 * Clear the MSR VSX bit to indicate there is no valid state attached
451 * to this context, except in the specific case below where we set it.
456 * Copy VSR 0-31 upper half from thread_struct to local
457 * buffer, then write that to userspace. Also set MSR_VSX in
458 * the saved MSR value to indicate that frame->mc_vregs
459 * contains valid data
461 if (current->thread.used_vsr && ctx_has_vsx_region) {
462 flush_vsx_to_thread(current);
463 if (copy_vsx_to_user(&frame->mc_vsregs, current))
467 #endif /* CONFIG_VSX */
469 /* save spe registers */
470 if (current->thread.used_spe) {
471 flush_spe_to_thread(current);
472 if (__copy_to_user(&frame->mc_vregs, current->thread.evr,
473 ELF_NEVRREG * sizeof(u32)))
475 /* set MSR_SPE in the saved MSR value to indicate that
476 frame->mc_vregs contains valid data */
479 /* else assert((regs->msr & MSR_SPE) == 0) */
481 /* We always copy to/from spefscr */
482 if (__put_user(current->thread.spefscr, (u32 __user *)&frame->mc_vregs + ELF_NEVRREG))
484 #endif /* CONFIG_SPE */
486 if (__put_user(msr, &frame->mc_gregs[PT_MSR]))
488 /* We need to write 0 the MSR top 32 bits in the tm frame so that we
489 * can check it on the restore to see if TM is active
491 if (tm_frame && __put_user(0, &tm_frame->mc_gregs[PT_MSR]))
495 /* Set up the sigreturn trampoline: li r0,sigret; sc */
496 if (__put_user(0x38000000UL + sigret, &frame->tramp[0])
497 || __put_user(0x44000002UL, &frame->tramp[1]))
499 flush_icache_range((unsigned long) &frame->tramp[0],
500 (unsigned long) &frame->tramp[2]);
506 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
508 * Save the current user registers on the user stack.
509 * We only save the altivec/spe registers if the process has used
510 * altivec/spe instructions at some point.
511 * We also save the transactional registers to a second ucontext in the
514 * See save_user_regs() and signal_64.c:setup_tm_sigcontexts().
516 static int save_tm_user_regs(struct pt_regs *regs,
517 struct mcontext __user *frame,
518 struct mcontext __user *tm_frame, int sigret)
520 unsigned long msr = regs->msr;
522 /* Remove TM bits from thread's MSR. The MSR in the sigcontext
523 * just indicates to userland that we were doing a transaction, but we
524 * don't want to return in transactional state. This also ensures
525 * that flush_fp_to_thread won't set TIF_RESTORE_TM again.
527 regs->msr &= ~MSR_TS_MASK;
529 /* Make sure floating point registers are stored in regs */
530 flush_fp_to_thread(current);
532 /* Save both sets of general registers */
533 if (save_general_regs(¤t->thread.ckpt_regs, frame)
534 || save_general_regs(regs, tm_frame))
537 /* Stash the top half of the 64bit MSR into the 32bit MSR word
538 * of the transactional mcontext. This way we have a backward-compatible
539 * MSR in the 'normal' (checkpointed) mcontext and additionally one can
540 * also look at what type of transaction (T or S) was active at the
541 * time of the signal.
543 if (__put_user((msr >> 32), &tm_frame->mc_gregs[PT_MSR]))
546 #ifdef CONFIG_ALTIVEC
547 /* save altivec registers */
548 if (current->thread.used_vr) {
549 flush_altivec_to_thread(current);
550 if (__copy_to_user(&frame->mc_vregs, ¤t->thread.vr_state,
551 ELF_NVRREG * sizeof(vector128)))
554 if (__copy_to_user(&tm_frame->mc_vregs,
555 ¤t->thread.transact_vr,
556 ELF_NVRREG * sizeof(vector128)))
559 if (__copy_to_user(&tm_frame->mc_vregs,
560 ¤t->thread.vr_state,
561 ELF_NVRREG * sizeof(vector128)))
565 /* set MSR_VEC in the saved MSR value to indicate that
566 * frame->mc_vregs contains valid data
571 /* We always copy to/from vrsave, it's 0 if we don't have or don't
572 * use altivec. Since VSCR only contains 32 bits saved in the least
573 * significant bits of a vector, we "cheat" and stuff VRSAVE in the
574 * most significant bits of that same vector. --BenH
576 if (cpu_has_feature(CPU_FTR_ALTIVEC))
577 current->thread.vrsave = mfspr(SPRN_VRSAVE);
578 if (__put_user(current->thread.vrsave,
579 (u32 __user *)&frame->mc_vregs[32]))
582 if (__put_user(current->thread.transact_vrsave,
583 (u32 __user *)&tm_frame->mc_vregs[32]))
586 if (__put_user(current->thread.vrsave,
587 (u32 __user *)&tm_frame->mc_vregs[32]))
590 #endif /* CONFIG_ALTIVEC */
592 if (copy_fpr_to_user(&frame->mc_fregs, current))
595 if (copy_transact_fpr_to_user(&tm_frame->mc_fregs, current))
598 if (copy_fpr_to_user(&tm_frame->mc_fregs, current))
604 * Copy VSR 0-31 upper half from thread_struct to local
605 * buffer, then write that to userspace. Also set MSR_VSX in
606 * the saved MSR value to indicate that frame->mc_vregs
607 * contains valid data
609 if (current->thread.used_vsr) {
610 flush_vsx_to_thread(current);
611 if (copy_vsx_to_user(&frame->mc_vsregs, current))
614 if (copy_transact_vsx_to_user(&tm_frame->mc_vsregs,
618 if (copy_vsx_to_user(&tm_frame->mc_vsregs, current))
624 #endif /* CONFIG_VSX */
626 /* SPE regs are not checkpointed with TM, so this section is
627 * simply the same as in save_user_regs().
629 if (current->thread.used_spe) {
630 flush_spe_to_thread(current);
631 if (__copy_to_user(&frame->mc_vregs, current->thread.evr,
632 ELF_NEVRREG * sizeof(u32)))
634 /* set MSR_SPE in the saved MSR value to indicate that
635 * frame->mc_vregs contains valid data */
639 /* We always copy to/from spefscr */
640 if (__put_user(current->thread.spefscr, (u32 __user *)&frame->mc_vregs + ELF_NEVRREG))
642 #endif /* CONFIG_SPE */
644 if (__put_user(msr, &frame->mc_gregs[PT_MSR]))
647 /* Set up the sigreturn trampoline: li r0,sigret; sc */
648 if (__put_user(0x38000000UL + sigret, &frame->tramp[0])
649 || __put_user(0x44000002UL, &frame->tramp[1]))
651 flush_icache_range((unsigned long) &frame->tramp[0],
652 (unsigned long) &frame->tramp[2]);
660 * Restore the current user register values from the user stack,
663 static long restore_user_regs(struct pt_regs *regs,
664 struct mcontext __user *sr, int sig)
667 unsigned int save_r2 = 0;
674 * restore general registers but not including MSR or SOFTE. Also
675 * take care of keeping r2 (TLS) intact if not a signal
678 save_r2 = (unsigned int)regs->gpr[2];
679 err = restore_general_regs(regs, sr);
681 err |= __get_user(msr, &sr->mc_gregs[PT_MSR]);
683 regs->gpr[2] = (unsigned long) save_r2;
687 /* if doing signal return, restore the previous little-endian mode */
689 regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE);
691 #ifdef CONFIG_ALTIVEC
693 * Force the process to reload the altivec registers from
694 * current->thread when it next does altivec instructions
696 regs->msr &= ~MSR_VEC;
698 /* restore altivec registers from the stack */
699 if (__copy_from_user(¤t->thread.vr_state, &sr->mc_vregs,
700 sizeof(sr->mc_vregs)))
702 current->thread.used_vr = true;
703 } else if (current->thread.used_vr)
704 memset(¤t->thread.vr_state, 0,
705 ELF_NVRREG * sizeof(vector128));
707 /* Always get VRSAVE back */
708 if (__get_user(current->thread.vrsave, (u32 __user *)&sr->mc_vregs[32]))
710 if (cpu_has_feature(CPU_FTR_ALTIVEC))
711 mtspr(SPRN_VRSAVE, current->thread.vrsave);
712 #endif /* CONFIG_ALTIVEC */
713 if (copy_fpr_from_user(current, &sr->mc_fregs))
718 * Force the process to reload the VSX registers from
719 * current->thread when it next does VSX instruction.
721 regs->msr &= ~MSR_VSX;
724 * Restore altivec registers from the stack to a local
725 * buffer, then write this out to the thread_struct
727 if (copy_vsx_from_user(current, &sr->mc_vsregs))
729 current->thread.used_vsr = true;
730 } else if (current->thread.used_vsr)
731 for (i = 0; i < 32 ; i++)
732 current->thread.fp_state.fpr[i][TS_VSRLOWOFFSET] = 0;
733 #endif /* CONFIG_VSX */
735 * force the process to reload the FP registers from
736 * current->thread when it next does FP instructions
738 regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1);
741 /* force the process to reload the spe registers from
742 current->thread when it next does spe instructions */
743 regs->msr &= ~MSR_SPE;
745 /* restore spe registers from the stack */
746 if (__copy_from_user(current->thread.evr, &sr->mc_vregs,
747 ELF_NEVRREG * sizeof(u32)))
749 current->thread.used_spe = true;
750 } else if (current->thread.used_spe)
751 memset(current->thread.evr, 0, ELF_NEVRREG * sizeof(u32));
753 /* Always get SPEFSCR back */
754 if (__get_user(current->thread.spefscr, (u32 __user *)&sr->mc_vregs + ELF_NEVRREG))
756 #endif /* CONFIG_SPE */
761 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
763 * Restore the current user register values from the user stack, except for
764 * MSR, and recheckpoint the original checkpointed register state for processes
767 static long restore_tm_user_regs(struct pt_regs *regs,
768 struct mcontext __user *sr,
769 struct mcontext __user *tm_sr)
772 unsigned long msr, msr_hi;
778 * restore general registers but not including MSR or SOFTE. Also
779 * take care of keeping r2 (TLS) intact if not a signal.
780 * See comment in signal_64.c:restore_tm_sigcontexts();
781 * TFHAR is restored from the checkpointed NIP; TEXASR and TFIAR
782 * were set by the signal delivery.
784 err = restore_general_regs(regs, tm_sr);
785 err |= restore_general_regs(¤t->thread.ckpt_regs, sr);
787 err |= __get_user(current->thread.tm_tfhar, &sr->mc_gregs[PT_NIP]);
789 err |= __get_user(msr, &sr->mc_gregs[PT_MSR]);
793 /* Restore the previous little-endian mode */
794 regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE);
796 #ifdef CONFIG_ALTIVEC
797 regs->msr &= ~MSR_VEC;
799 /* restore altivec registers from the stack */
800 if (__copy_from_user(¤t->thread.vr_state, &sr->mc_vregs,
801 sizeof(sr->mc_vregs)) ||
802 __copy_from_user(¤t->thread.transact_vr,
804 sizeof(sr->mc_vregs)))
806 current->thread.used_vr = true;
807 } else if (current->thread.used_vr) {
808 memset(¤t->thread.vr_state, 0,
809 ELF_NVRREG * sizeof(vector128));
810 memset(¤t->thread.transact_vr, 0,
811 ELF_NVRREG * sizeof(vector128));
814 /* Always get VRSAVE back */
815 if (__get_user(current->thread.vrsave,
816 (u32 __user *)&sr->mc_vregs[32]) ||
817 __get_user(current->thread.transact_vrsave,
818 (u32 __user *)&tm_sr->mc_vregs[32]))
820 if (cpu_has_feature(CPU_FTR_ALTIVEC))
821 mtspr(SPRN_VRSAVE, current->thread.vrsave);
822 #endif /* CONFIG_ALTIVEC */
824 regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1);
826 if (copy_fpr_from_user(current, &sr->mc_fregs) ||
827 copy_transact_fpr_from_user(current, &tm_sr->mc_fregs))
831 regs->msr &= ~MSR_VSX;
834 * Restore altivec registers from the stack to a local
835 * buffer, then write this out to the thread_struct
837 if (copy_vsx_from_user(current, &sr->mc_vsregs) ||
838 copy_transact_vsx_from_user(current, &tm_sr->mc_vsregs))
840 current->thread.used_vsr = true;
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 current->thread.used_spe = true;
858 } else if (current->thread.used_spe)
859 memset(current->thread.evr, 0, ELF_NEVRREG * sizeof(u32));
861 /* Always get SPEFSCR back */
862 if (__get_user(current->thread.spefscr, (u32 __user *)&sr->mc_vregs
865 #endif /* CONFIG_SPE */
867 /* Get the top half of the MSR from the user context */
868 if (__get_user(msr_hi, &tm_sr->mc_gregs[PT_MSR]))
871 /* If TM bits are set to the reserved value, it's an invalid context */
872 if (MSR_TM_RESV(msr_hi))
874 /* Pull in the MSR TM bits from the user context */
875 regs->msr = (regs->msr & ~MSR_TS_MASK) | (msr_hi & MSR_TS_MASK);
876 /* Now, recheckpoint. This loads up all of the checkpointed (older)
877 * registers, including FP and V[S]Rs. After recheckpointing, the
878 * transactional versions should be loaded.
881 /* Make sure the transaction is marked as failed */
882 current->thread.tm_texasr |= TEXASR_FS;
883 /* This loads the checkpointed FP/VEC state, if used */
884 tm_recheckpoint(¤t->thread, msr);
886 /* This loads the speculative FP/VEC state, if used */
888 do_load_up_transact_fpu(¤t->thread);
889 regs->msr |= (MSR_FP | current->thread.fpexc_mode);
891 #ifdef CONFIG_ALTIVEC
893 do_load_up_transact_altivec(¤t->thread);
894 regs->msr |= MSR_VEC;
903 int copy_siginfo_to_user32(struct compat_siginfo __user *d, const siginfo_t *s)
907 if (!access_ok (VERIFY_WRITE, d, sizeof(*d)))
910 /* If you change siginfo_t structure, please be sure
911 * this code is fixed accordingly.
912 * It should never copy any pad contained in the structure
913 * to avoid security leaks, but must copy the generic
914 * 3 ints plus the relevant union member.
915 * This routine must convert siginfo from 64bit to 32bit as well
918 err = __put_user(s->si_signo, &d->si_signo);
919 err |= __put_user(s->si_errno, &d->si_errno);
920 err |= __put_user((short)s->si_code, &d->si_code);
922 err |= __copy_to_user(&d->_sifields._pad, &s->_sifields._pad,
924 else switch(s->si_code >> 16) {
925 case __SI_CHLD >> 16:
926 err |= __put_user(s->si_pid, &d->si_pid);
927 err |= __put_user(s->si_uid, &d->si_uid);
928 err |= __put_user(s->si_utime, &d->si_utime);
929 err |= __put_user(s->si_stime, &d->si_stime);
930 err |= __put_user(s->si_status, &d->si_status);
932 case __SI_FAULT >> 16:
933 err |= __put_user((unsigned int)(unsigned long)s->si_addr,
936 case __SI_POLL >> 16:
937 err |= __put_user(s->si_band, &d->si_band);
938 err |= __put_user(s->si_fd, &d->si_fd);
940 case __SI_TIMER >> 16:
941 err |= __put_user(s->si_tid, &d->si_tid);
942 err |= __put_user(s->si_overrun, &d->si_overrun);
943 err |= __put_user(s->si_int, &d->si_int);
946 err |= __put_user(ptr_to_compat(s->si_call_addr), &d->si_call_addr);
947 err |= __put_user(s->si_syscall, &d->si_syscall);
948 err |= __put_user(s->si_arch, &d->si_arch);
950 case __SI_RT >> 16: /* This is not generated by the kernel as of now. */
951 case __SI_MESGQ >> 16:
952 err |= __put_user(s->si_int, &d->si_int);
954 case __SI_KILL >> 16:
956 err |= __put_user(s->si_pid, &d->si_pid);
957 err |= __put_user(s->si_uid, &d->si_uid);
963 #define copy_siginfo_to_user copy_siginfo_to_user32
965 int copy_siginfo_from_user32(siginfo_t *to, struct compat_siginfo __user *from)
967 if (copy_from_user(to, from, 3*sizeof(int)) ||
968 copy_from_user(to->_sifields._pad,
969 from->_sifields._pad, SI_PAD_SIZE32))
974 #endif /* CONFIG_PPC64 */
977 * Set up a signal frame for a "real-time" signal handler
978 * (one which gets siginfo).
980 int handle_rt_signal32(struct ksignal *ksig, sigset_t *oldset,
981 struct pt_regs *regs)
983 struct rt_sigframe __user *rt_sf;
984 struct mcontext __user *frame;
985 struct mcontext __user *tm_frame = NULL;
987 unsigned long newsp = 0;
991 /* Set up Signal Frame */
992 /* Put a Real Time Context onto stack */
993 rt_sf = get_sigframe(ksig, get_tm_stackpointer(regs), sizeof(*rt_sf), 1);
995 if (unlikely(rt_sf == NULL))
998 /* Put the siginfo & fill in most of the ucontext */
999 if (copy_siginfo_to_user(&rt_sf->info, &ksig->info)
1000 || __put_user(0, &rt_sf->uc.uc_flags)
1001 || __save_altstack(&rt_sf->uc.uc_stack, regs->gpr[1])
1002 || __put_user(to_user_ptr(&rt_sf->uc.uc_mcontext),
1004 || put_sigset_t(&rt_sf->uc.uc_sigmask, oldset))
1007 /* Save user registers on the stack */
1008 frame = &rt_sf->uc.uc_mcontext;
1010 if (vdso32_rt_sigtramp && current->mm->context.vdso_base) {
1012 tramp = current->mm->context.vdso_base + vdso32_rt_sigtramp;
1014 sigret = __NR_rt_sigreturn;
1015 tramp = (unsigned long) frame->tramp;
1018 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1019 tm_frame = &rt_sf->uc_transact.uc_mcontext;
1020 if (MSR_TM_ACTIVE(regs->msr)) {
1021 if (__put_user((unsigned long)&rt_sf->uc_transact,
1022 &rt_sf->uc.uc_link) ||
1023 __put_user((unsigned long)tm_frame,
1024 &rt_sf->uc_transact.uc_regs))
1026 if (save_tm_user_regs(regs, frame, tm_frame, sigret))
1032 if (__put_user(0, &rt_sf->uc.uc_link))
1034 if (save_user_regs(regs, frame, tm_frame, sigret, 1))
1039 current->thread.fp_state.fpscr = 0; /* turn off all fp exceptions */
1041 /* create a stack frame for the caller of the handler */
1042 newsp = ((unsigned long)rt_sf) - (__SIGNAL_FRAMESIZE + 16);
1043 addr = (void __user *)regs->gpr[1];
1044 if (put_user(regs->gpr[1], (u32 __user *)newsp))
1047 /* Fill registers for signal handler */
1048 regs->gpr[1] = newsp;
1049 regs->gpr[3] = ksig->sig;
1050 regs->gpr[4] = (unsigned long) &rt_sf->info;
1051 regs->gpr[5] = (unsigned long) &rt_sf->uc;
1052 regs->gpr[6] = (unsigned long) rt_sf;
1053 regs->nip = (unsigned long) ksig->ka.sa.sa_handler;
1054 /* enter the signal handler in native-endian mode */
1055 regs->msr &= ~MSR_LE;
1056 regs->msr |= (MSR_KERNEL & MSR_LE);
1060 if (show_unhandled_signals)
1061 printk_ratelimited(KERN_INFO
1062 "%s[%d]: bad frame in handle_rt_signal32: "
1063 "%p nip %08lx lr %08lx\n",
1064 current->comm, current->pid,
1065 addr, regs->nip, regs->link);
1070 static int do_setcontext(struct ucontext __user *ucp, struct pt_regs *regs, int sig)
1073 struct mcontext __user *mcp;
1075 if (get_sigset_t(&set, &ucp->uc_sigmask))
1081 if (__get_user(cmcp, &ucp->uc_regs))
1083 mcp = (struct mcontext __user *)(u64)cmcp;
1084 /* no need to check access_ok(mcp), since mcp < 4GB */
1087 if (__get_user(mcp, &ucp->uc_regs))
1089 if (!access_ok(VERIFY_READ, mcp, sizeof(*mcp)))
1092 set_current_blocked(&set);
1093 if (restore_user_regs(regs, mcp, sig))
1099 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1100 static int do_setcontext_tm(struct ucontext __user *ucp,
1101 struct ucontext __user *tm_ucp,
1102 struct pt_regs *regs)
1105 struct mcontext __user *mcp;
1106 struct mcontext __user *tm_mcp;
1110 if (get_sigset_t(&set, &ucp->uc_sigmask))
1113 if (__get_user(cmcp, &ucp->uc_regs) ||
1114 __get_user(tm_cmcp, &tm_ucp->uc_regs))
1116 mcp = (struct mcontext __user *)(u64)cmcp;
1117 tm_mcp = (struct mcontext __user *)(u64)tm_cmcp;
1118 /* no need to check access_ok(mcp), since mcp < 4GB */
1120 set_current_blocked(&set);
1121 if (restore_tm_user_regs(regs, mcp, tm_mcp))
1128 long sys_swapcontext(struct ucontext __user *old_ctx,
1129 struct ucontext __user *new_ctx,
1130 int ctx_size, int r6, int r7, int r8, struct pt_regs *regs)
1133 int ctx_has_vsx_region = 0;
1136 unsigned long new_msr = 0;
1139 struct mcontext __user *mcp;
1143 * Get pointer to the real mcontext. No need for
1144 * access_ok since we are dealing with compat
1147 if (__get_user(cmcp, &new_ctx->uc_regs))
1149 mcp = (struct mcontext __user *)(u64)cmcp;
1150 if (__get_user(new_msr, &mcp->mc_gregs[PT_MSR]))
1154 * Check that the context is not smaller than the original
1155 * size (with VMX but without VSX)
1157 if (ctx_size < UCONTEXTSIZEWITHOUTVSX)
1160 * If the new context state sets the MSR VSX bits but
1161 * it doesn't provide VSX state.
1163 if ((ctx_size < sizeof(struct ucontext)) &&
1164 (new_msr & MSR_VSX))
1166 /* Does the context have enough room to store VSX data? */
1167 if (ctx_size >= sizeof(struct ucontext))
1168 ctx_has_vsx_region = 1;
1170 /* Context size is for future use. Right now, we only make sure
1171 * we are passed something we understand
1173 if (ctx_size < sizeof(struct ucontext))
1176 if (old_ctx != NULL) {
1177 struct mcontext __user *mctx;
1180 * old_ctx might not be 16-byte aligned, in which
1181 * case old_ctx->uc_mcontext won't be either.
1182 * Because we have the old_ctx->uc_pad2 field
1183 * before old_ctx->uc_mcontext, we need to round down
1184 * from &old_ctx->uc_mcontext to a 16-byte boundary.
1186 mctx = (struct mcontext __user *)
1187 ((unsigned long) &old_ctx->uc_mcontext & ~0xfUL);
1188 if (!access_ok(VERIFY_WRITE, old_ctx, ctx_size)
1189 || save_user_regs(regs, mctx, NULL, 0, ctx_has_vsx_region)
1190 || put_sigset_t(&old_ctx->uc_sigmask, ¤t->blocked)
1191 || __put_user(to_user_ptr(mctx), &old_ctx->uc_regs))
1194 if (new_ctx == NULL)
1196 if (!access_ok(VERIFY_READ, new_ctx, ctx_size)
1197 || __get_user(tmp, (u8 __user *) new_ctx)
1198 || __get_user(tmp, (u8 __user *) new_ctx + ctx_size - 1))
1202 * If we get a fault copying the context into the kernel's
1203 * image of the user's registers, we can't just return -EFAULT
1204 * because the user's registers will be corrupted. For instance
1205 * the NIP value may have been updated but not some of the
1206 * other registers. Given that we have done the access_ok
1207 * and successfully read the first and last bytes of the region
1208 * above, this should only happen in an out-of-memory situation
1209 * or if another thread unmaps the region containing the context.
1210 * We kill the task with a SIGSEGV in this situation.
1212 if (do_setcontext(new_ctx, regs, 0))
1215 set_thread_flag(TIF_RESTOREALL);
1219 long sys_rt_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8,
1220 struct pt_regs *regs)
1222 struct rt_sigframe __user *rt_sf;
1223 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1224 struct ucontext __user *uc_transact;
1225 unsigned long msr_hi;
1229 /* Always make any pending restarted system calls return -EINTR */
1230 current->restart_block.fn = do_no_restart_syscall;
1232 rt_sf = (struct rt_sigframe __user *)
1233 (regs->gpr[1] + __SIGNAL_FRAMESIZE + 16);
1234 if (!access_ok(VERIFY_READ, rt_sf, sizeof(*rt_sf)))
1237 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1239 * If there is a transactional state then throw it away.
1240 * The purpose of a sigreturn is to destroy all traces of the
1241 * signal frame, this includes any transactional state created
1242 * within in. We only check for suspended as we can never be
1243 * active in the kernel, we are active, there is nothing better to
1244 * do than go ahead and Bad Thing later.
1245 * The cause is not important as there will never be a
1246 * recheckpoint so it's not user visible.
1248 if (MSR_TM_SUSPENDED(mfmsr()))
1249 tm_reclaim_current(0);
1251 if (__get_user(tmp, &rt_sf->uc.uc_link))
1253 uc_transact = (struct ucontext __user *)(uintptr_t)tmp;
1256 struct mcontext __user *mcp;
1258 if (__get_user(cmcp, &uc_transact->uc_regs))
1260 mcp = (struct mcontext __user *)(u64)cmcp;
1261 /* The top 32 bits of the MSR are stashed in the transactional
1263 if (__get_user(msr_hi, &mcp->mc_gregs[PT_MSR]))
1266 if (MSR_TM_ACTIVE(msr_hi<<32)) {
1267 /* We only recheckpoint on return if we're
1271 if (do_setcontext_tm(&rt_sf->uc, uc_transact, regs))
1276 /* Fall through, for non-TM restore */
1278 if (do_setcontext(&rt_sf->uc, regs, 1))
1282 * It's not clear whether or why it is desirable to save the
1283 * sigaltstack setting on signal delivery and restore it on
1284 * signal return. But other architectures do this and we have
1285 * always done it up until now so it is probably better not to
1286 * change it. -- paulus
1289 if (compat_restore_altstack(&rt_sf->uc.uc_stack))
1292 if (restore_altstack(&rt_sf->uc.uc_stack))
1295 set_thread_flag(TIF_RESTOREALL);
1299 if (show_unhandled_signals)
1300 printk_ratelimited(KERN_INFO
1301 "%s[%d]: bad frame in sys_rt_sigreturn: "
1302 "%p nip %08lx lr %08lx\n",
1303 current->comm, current->pid,
1304 rt_sf, regs->nip, regs->link);
1306 force_sig(SIGSEGV, current);
1311 int sys_debug_setcontext(struct ucontext __user *ctx,
1312 int ndbg, struct sig_dbg_op __user *dbg,
1313 int r6, int r7, int r8,
1314 struct pt_regs *regs)
1316 struct sig_dbg_op op;
1319 unsigned long new_msr = regs->msr;
1320 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
1321 unsigned long new_dbcr0 = current->thread.debug.dbcr0;
1324 for (i=0; i<ndbg; i++) {
1325 if (copy_from_user(&op, dbg + i, sizeof(op)))
1327 switch (op.dbg_type) {
1328 case SIG_DBG_SINGLE_STEPPING:
1329 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
1332 new_dbcr0 |= (DBCR0_IDM | DBCR0_IC);
1334 new_dbcr0 &= ~DBCR0_IC;
1335 if (!DBCR_ACTIVE_EVENTS(new_dbcr0,
1336 current->thread.debug.dbcr1)) {
1338 new_dbcr0 &= ~DBCR0_IDM;
1348 case SIG_DBG_BRANCH_TRACING:
1349 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
1364 /* We wait until here to actually install the values in the
1365 registers so if we fail in the above loop, it will not
1366 affect the contents of these registers. After this point,
1367 failure is a problem, anyway, and it's very unlikely unless
1368 the user is really doing something wrong. */
1369 regs->msr = new_msr;
1370 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
1371 current->thread.debug.dbcr0 = new_dbcr0;
1374 if (!access_ok(VERIFY_READ, ctx, sizeof(*ctx))
1375 || __get_user(tmp, (u8 __user *) ctx)
1376 || __get_user(tmp, (u8 __user *) (ctx + 1) - 1))
1380 * If we get a fault copying the context into the kernel's
1381 * image of the user's registers, we can't just return -EFAULT
1382 * because the user's registers will be corrupted. For instance
1383 * the NIP value may have been updated but not some of the
1384 * other registers. Given that we have done the access_ok
1385 * and successfully read the first and last bytes of the region
1386 * above, this should only happen in an out-of-memory situation
1387 * or if another thread unmaps the region containing the context.
1388 * We kill the task with a SIGSEGV in this situation.
1390 if (do_setcontext(ctx, regs, 1)) {
1391 if (show_unhandled_signals)
1392 printk_ratelimited(KERN_INFO "%s[%d]: bad frame in "
1393 "sys_debug_setcontext: %p nip %08lx "
1395 current->comm, current->pid,
1396 ctx, regs->nip, regs->link);
1398 force_sig(SIGSEGV, current);
1403 * It's not clear whether or why it is desirable to save the
1404 * sigaltstack setting on signal delivery and restore it on
1405 * signal return. But other architectures do this and we have
1406 * always done it up until now so it is probably better not to
1407 * change it. -- paulus
1409 restore_altstack(&ctx->uc_stack);
1411 set_thread_flag(TIF_RESTOREALL);
1418 * OK, we're invoking a handler
1420 int handle_signal32(struct ksignal *ksig, sigset_t *oldset, struct pt_regs *regs)
1422 struct sigcontext __user *sc;
1423 struct sigframe __user *frame;
1424 struct mcontext __user *tm_mctx = NULL;
1425 unsigned long newsp = 0;
1427 unsigned long tramp;
1429 /* Set up Signal Frame */
1430 frame = get_sigframe(ksig, get_tm_stackpointer(regs), sizeof(*frame), 1);
1431 if (unlikely(frame == NULL))
1433 sc = (struct sigcontext __user *) &frame->sctx;
1436 #error "Please adjust handle_signal()"
1438 if (__put_user(to_user_ptr(ksig->ka.sa.sa_handler), &sc->handler)
1439 || __put_user(oldset->sig[0], &sc->oldmask)
1441 || __put_user((oldset->sig[0] >> 32), &sc->_unused[3])
1443 || __put_user(oldset->sig[1], &sc->_unused[3])
1445 || __put_user(to_user_ptr(&frame->mctx), &sc->regs)
1446 || __put_user(ksig->sig, &sc->signal))
1449 if (vdso32_sigtramp && current->mm->context.vdso_base) {
1451 tramp = current->mm->context.vdso_base + vdso32_sigtramp;
1453 sigret = __NR_sigreturn;
1454 tramp = (unsigned long) frame->mctx.tramp;
1457 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1458 tm_mctx = &frame->mctx_transact;
1459 if (MSR_TM_ACTIVE(regs->msr)) {
1460 if (save_tm_user_regs(regs, &frame->mctx, &frame->mctx_transact,
1467 if (save_user_regs(regs, &frame->mctx, tm_mctx, sigret, 1))
1473 current->thread.fp_state.fpscr = 0; /* turn off all fp exceptions */
1475 /* create a stack frame for the caller of the handler */
1476 newsp = ((unsigned long)frame) - __SIGNAL_FRAMESIZE;
1477 if (put_user(regs->gpr[1], (u32 __user *)newsp))
1480 regs->gpr[1] = newsp;
1481 regs->gpr[3] = ksig->sig;
1482 regs->gpr[4] = (unsigned long) sc;
1483 regs->nip = (unsigned long) (unsigned long)ksig->ka.sa.sa_handler;
1484 /* enter the signal handler in big-endian mode */
1485 regs->msr &= ~MSR_LE;
1489 if (show_unhandled_signals)
1490 printk_ratelimited(KERN_INFO
1491 "%s[%d]: bad frame in handle_signal32: "
1492 "%p nip %08lx lr %08lx\n",
1493 current->comm, current->pid,
1494 frame, regs->nip, regs->link);
1500 * Do a signal return; undo the signal stack.
1502 long sys_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8,
1503 struct pt_regs *regs)
1505 struct sigframe __user *sf;
1506 struct sigcontext __user *sc;
1507 struct sigcontext sigctx;
1508 struct mcontext __user *sr;
1511 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1512 struct mcontext __user *mcp, *tm_mcp;
1513 unsigned long msr_hi;
1516 /* Always make any pending restarted system calls return -EINTR */
1517 current->restart_block.fn = do_no_restart_syscall;
1519 sf = (struct sigframe __user *)(regs->gpr[1] + __SIGNAL_FRAMESIZE);
1522 if (copy_from_user(&sigctx, sc, sizeof(sigctx)))
1527 * Note that PPC32 puts the upper 32 bits of the sigmask in the
1528 * unused part of the signal stackframe
1530 set.sig[0] = sigctx.oldmask + ((long)(sigctx._unused[3]) << 32);
1532 set.sig[0] = sigctx.oldmask;
1533 set.sig[1] = sigctx._unused[3];
1535 set_current_blocked(&set);
1537 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1538 mcp = (struct mcontext __user *)&sf->mctx;
1539 tm_mcp = (struct mcontext __user *)&sf->mctx_transact;
1540 if (__get_user(msr_hi, &tm_mcp->mc_gregs[PT_MSR]))
1542 if (MSR_TM_ACTIVE(msr_hi<<32)) {
1543 if (!cpu_has_feature(CPU_FTR_TM))
1545 if (restore_tm_user_regs(regs, mcp, tm_mcp))
1550 sr = (struct mcontext __user *)from_user_ptr(sigctx.regs);
1552 if (!access_ok(VERIFY_READ, sr, sizeof(*sr))
1553 || restore_user_regs(regs, sr, 1))
1557 set_thread_flag(TIF_RESTOREALL);
1561 if (show_unhandled_signals)
1562 printk_ratelimited(KERN_INFO
1563 "%s[%d]: bad frame in sys_sigreturn: "
1564 "%p nip %08lx lr %08lx\n",
1565 current->comm, current->pid,
1566 addr, regs->nip, regs->link);
1568 force_sig(SIGSEGV, current);