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 * 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 __giveup_vsx(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 /* Make sure floating point registers are stored in regs */
523 flush_fp_to_thread(current);
525 /* Save both sets of general registers */
526 if (save_general_regs(¤t->thread.ckpt_regs, frame)
527 || save_general_regs(regs, tm_frame))
530 /* Stash the top half of the 64bit MSR into the 32bit MSR word
531 * of the transactional mcontext. This way we have a backward-compatible
532 * MSR in the 'normal' (checkpointed) mcontext and additionally one can
533 * also look at what type of transaction (T or S) was active at the
534 * time of the signal.
536 if (__put_user((msr >> 32), &tm_frame->mc_gregs[PT_MSR]))
539 #ifdef CONFIG_ALTIVEC
540 /* save altivec registers */
541 if (current->thread.used_vr) {
542 flush_altivec_to_thread(current);
543 if (__copy_to_user(&frame->mc_vregs, ¤t->thread.vr_state,
544 ELF_NVRREG * sizeof(vector128)))
547 if (__copy_to_user(&tm_frame->mc_vregs,
548 ¤t->thread.transact_vr,
549 ELF_NVRREG * sizeof(vector128)))
552 if (__copy_to_user(&tm_frame->mc_vregs,
553 ¤t->thread.vr_state,
554 ELF_NVRREG * sizeof(vector128)))
558 /* set MSR_VEC in the saved MSR value to indicate that
559 * frame->mc_vregs contains valid data
564 /* We always copy to/from vrsave, it's 0 if we don't have or don't
565 * use altivec. Since VSCR only contains 32 bits saved in the least
566 * significant bits of a vector, we "cheat" and stuff VRSAVE in the
567 * most significant bits of that same vector. --BenH
569 if (cpu_has_feature(CPU_FTR_ALTIVEC))
570 current->thread.vrsave = mfspr(SPRN_VRSAVE);
571 if (__put_user(current->thread.vrsave,
572 (u32 __user *)&frame->mc_vregs[32]))
575 if (__put_user(current->thread.transact_vrsave,
576 (u32 __user *)&tm_frame->mc_vregs[32]))
579 if (__put_user(current->thread.vrsave,
580 (u32 __user *)&tm_frame->mc_vregs[32]))
583 #endif /* CONFIG_ALTIVEC */
585 if (copy_fpr_to_user(&frame->mc_fregs, current))
588 if (copy_transact_fpr_to_user(&tm_frame->mc_fregs, current))
591 if (copy_fpr_to_user(&tm_frame->mc_fregs, current))
597 * Copy VSR 0-31 upper half from thread_struct to local
598 * buffer, then write that to userspace. Also set MSR_VSX in
599 * the saved MSR value to indicate that frame->mc_vregs
600 * contains valid data
602 if (current->thread.used_vsr) {
603 __giveup_vsx(current);
604 if (copy_vsx_to_user(&frame->mc_vsregs, current))
607 if (copy_transact_vsx_to_user(&tm_frame->mc_vsregs,
611 if (copy_vsx_to_user(&tm_frame->mc_vsregs, current))
617 #endif /* CONFIG_VSX */
619 /* SPE regs are not checkpointed with TM, so this section is
620 * simply the same as in save_user_regs().
622 if (current->thread.used_spe) {
623 flush_spe_to_thread(current);
624 if (__copy_to_user(&frame->mc_vregs, current->thread.evr,
625 ELF_NEVRREG * sizeof(u32)))
627 /* set MSR_SPE in the saved MSR value to indicate that
628 * frame->mc_vregs contains valid data */
632 /* We always copy to/from spefscr */
633 if (__put_user(current->thread.spefscr, (u32 __user *)&frame->mc_vregs + ELF_NEVRREG))
635 #endif /* CONFIG_SPE */
637 if (__put_user(msr, &frame->mc_gregs[PT_MSR]))
640 /* Set up the sigreturn trampoline: li r0,sigret; sc */
641 if (__put_user(0x38000000UL + sigret, &frame->tramp[0])
642 || __put_user(0x44000002UL, &frame->tramp[1]))
644 flush_icache_range((unsigned long) &frame->tramp[0],
645 (unsigned long) &frame->tramp[2]);
653 * Restore the current user register values from the user stack,
656 static long restore_user_regs(struct pt_regs *regs,
657 struct mcontext __user *sr, int sig)
660 unsigned int save_r2 = 0;
667 * restore general registers but not including MSR or SOFTE. Also
668 * take care of keeping r2 (TLS) intact if not a signal
671 save_r2 = (unsigned int)regs->gpr[2];
672 err = restore_general_regs(regs, sr);
674 err |= __get_user(msr, &sr->mc_gregs[PT_MSR]);
676 regs->gpr[2] = (unsigned long) save_r2;
680 /* if doing signal return, restore the previous little-endian mode */
682 regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE);
685 * Do this before updating the thread state in
686 * current->thread.fpr/vr/evr. That way, if we get preempted
687 * and another task grabs the FPU/Altivec/SPE, it won't be
688 * tempted to save the current CPU state into the thread_struct
689 * and corrupt what we are writing there.
691 discard_lazy_cpu_state();
693 #ifdef CONFIG_ALTIVEC
695 * Force the process to reload the altivec registers from
696 * current->thread when it next does altivec instructions
698 regs->msr &= ~MSR_VEC;
700 /* restore altivec registers from the stack */
701 if (__copy_from_user(¤t->thread.vr_state, &sr->mc_vregs,
702 sizeof(sr->mc_vregs)))
704 } else if (current->thread.used_vr)
705 memset(¤t->thread.vr_state, 0,
706 ELF_NVRREG * sizeof(vector128));
708 /* Always get VRSAVE back */
709 if (__get_user(current->thread.vrsave, (u32 __user *)&sr->mc_vregs[32]))
711 if (cpu_has_feature(CPU_FTR_ALTIVEC))
712 mtspr(SPRN_VRSAVE, current->thread.vrsave);
713 #endif /* CONFIG_ALTIVEC */
714 if (copy_fpr_from_user(current, &sr->mc_fregs))
719 * Force the process to reload the VSX registers from
720 * current->thread when it next does VSX instruction.
722 regs->msr &= ~MSR_VSX;
725 * Restore altivec registers from the stack to a local
726 * buffer, then write this out to the thread_struct
728 if (copy_vsx_from_user(current, &sr->mc_vsregs))
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 } else if (current->thread.used_spe)
750 memset(current->thread.evr, 0, ELF_NEVRREG * sizeof(u32));
752 /* Always get SPEFSCR back */
753 if (__get_user(current->thread.spefscr, (u32 __user *)&sr->mc_vregs + ELF_NEVRREG))
755 #endif /* CONFIG_SPE */
760 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
762 * Restore the current user register values from the user stack, except for
763 * MSR, and recheckpoint the original checkpointed register state for processes
766 static long restore_tm_user_regs(struct pt_regs *regs,
767 struct mcontext __user *sr,
768 struct mcontext __user *tm_sr)
771 unsigned long msr, msr_hi;
777 * restore general registers but not including MSR or SOFTE. Also
778 * take care of keeping r2 (TLS) intact if not a signal.
779 * See comment in signal_64.c:restore_tm_sigcontexts();
780 * TFHAR is restored from the checkpointed NIP; TEXASR and TFIAR
781 * were set by the signal delivery.
783 err = restore_general_regs(regs, tm_sr);
784 err |= restore_general_regs(¤t->thread.ckpt_regs, sr);
786 err |= __get_user(current->thread.tm_tfhar, &sr->mc_gregs[PT_NIP]);
788 err |= __get_user(msr, &sr->mc_gregs[PT_MSR]);
792 /* Restore the previous little-endian mode */
793 regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE);
796 * Do this before updating the thread state in
797 * current->thread.fpr/vr/evr. That way, if we get preempted
798 * and another task grabs the FPU/Altivec/SPE, it won't be
799 * tempted to save the current CPU state into the thread_struct
800 * and corrupt what we are writing there.
802 discard_lazy_cpu_state();
804 #ifdef CONFIG_ALTIVEC
805 regs->msr &= ~MSR_VEC;
807 /* restore altivec registers from the stack */
808 if (__copy_from_user(¤t->thread.vr_state, &sr->mc_vregs,
809 sizeof(sr->mc_vregs)) ||
810 __copy_from_user(¤t->thread.transact_vr,
812 sizeof(sr->mc_vregs)))
814 } else if (current->thread.used_vr) {
815 memset(¤t->thread.vr_state, 0,
816 ELF_NVRREG * sizeof(vector128));
817 memset(¤t->thread.transact_vr, 0,
818 ELF_NVRREG * sizeof(vector128));
821 /* Always get VRSAVE back */
822 if (__get_user(current->thread.vrsave,
823 (u32 __user *)&sr->mc_vregs[32]) ||
824 __get_user(current->thread.transact_vrsave,
825 (u32 __user *)&tm_sr->mc_vregs[32]))
827 if (cpu_has_feature(CPU_FTR_ALTIVEC))
828 mtspr(SPRN_VRSAVE, current->thread.vrsave);
829 #endif /* CONFIG_ALTIVEC */
831 regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1);
833 if (copy_fpr_from_user(current, &sr->mc_fregs) ||
834 copy_transact_fpr_from_user(current, &tm_sr->mc_fregs))
838 regs->msr &= ~MSR_VSX;
841 * Restore altivec registers from the stack to a local
842 * buffer, then write this out to the thread_struct
844 if (copy_vsx_from_user(current, &sr->mc_vsregs) ||
845 copy_transact_vsx_from_user(current, &tm_sr->mc_vsregs))
847 } else if (current->thread.used_vsr)
848 for (i = 0; i < 32 ; i++) {
849 current->thread.fp_state.fpr[i][TS_VSRLOWOFFSET] = 0;
850 current->thread.transact_fp.fpr[i][TS_VSRLOWOFFSET] = 0;
852 #endif /* CONFIG_VSX */
855 /* SPE regs are not checkpointed with TM, so this section is
856 * simply the same as in restore_user_regs().
858 regs->msr &= ~MSR_SPE;
860 if (__copy_from_user(current->thread.evr, &sr->mc_vregs,
861 ELF_NEVRREG * sizeof(u32)))
863 } else if (current->thread.used_spe)
864 memset(current->thread.evr, 0, ELF_NEVRREG * sizeof(u32));
866 /* Always get SPEFSCR back */
867 if (__get_user(current->thread.spefscr, (u32 __user *)&sr->mc_vregs
870 #endif /* CONFIG_SPE */
872 /* Now, recheckpoint. This loads up all of the checkpointed (older)
873 * registers, including FP and V[S]Rs. After recheckpointing, the
874 * transactional versions should be loaded.
877 /* This loads the checkpointed FP/VEC state, if used */
878 tm_recheckpoint(¤t->thread, msr);
879 /* Get the top half of the MSR */
880 if (__get_user(msr_hi, &tm_sr->mc_gregs[PT_MSR]))
882 /* Pull in MSR TM from user context */
883 regs->msr = (regs->msr & ~MSR_TS_MASK) | ((msr_hi<<32) & MSR_TS_MASK);
885 /* This loads the speculative FP/VEC state, if used */
887 do_load_up_transact_fpu(¤t->thread);
888 regs->msr |= (MSR_FP | current->thread.fpexc_mode);
890 #ifdef CONFIG_ALTIVEC
892 do_load_up_transact_altivec(¤t->thread);
893 regs->msr |= MSR_VEC;
902 int copy_siginfo_to_user32(struct compat_siginfo __user *d, const siginfo_t *s)
906 if (!access_ok (VERIFY_WRITE, d, sizeof(*d)))
909 /* If you change siginfo_t structure, please be sure
910 * this code is fixed accordingly.
911 * It should never copy any pad contained in the structure
912 * to avoid security leaks, but must copy the generic
913 * 3 ints plus the relevant union member.
914 * This routine must convert siginfo from 64bit to 32bit as well
917 err = __put_user(s->si_signo, &d->si_signo);
918 err |= __put_user(s->si_errno, &d->si_errno);
919 err |= __put_user((short)s->si_code, &d->si_code);
921 err |= __copy_to_user(&d->_sifields._pad, &s->_sifields._pad,
923 else switch(s->si_code >> 16) {
924 case __SI_CHLD >> 16:
925 err |= __put_user(s->si_pid, &d->si_pid);
926 err |= __put_user(s->si_uid, &d->si_uid);
927 err |= __put_user(s->si_utime, &d->si_utime);
928 err |= __put_user(s->si_stime, &d->si_stime);
929 err |= __put_user(s->si_status, &d->si_status);
931 case __SI_FAULT >> 16:
932 err |= __put_user((unsigned int)(unsigned long)s->si_addr,
935 case __SI_POLL >> 16:
936 err |= __put_user(s->si_band, &d->si_band);
937 err |= __put_user(s->si_fd, &d->si_fd);
939 case __SI_TIMER >> 16:
940 err |= __put_user(s->si_tid, &d->si_tid);
941 err |= __put_user(s->si_overrun, &d->si_overrun);
942 err |= __put_user(s->si_int, &d->si_int);
944 case __SI_RT >> 16: /* This is not generated by the kernel as of now. */
945 case __SI_MESGQ >> 16:
946 err |= __put_user(s->si_int, &d->si_int);
948 case __SI_KILL >> 16:
950 err |= __put_user(s->si_pid, &d->si_pid);
951 err |= __put_user(s->si_uid, &d->si_uid);
957 #define copy_siginfo_to_user copy_siginfo_to_user32
959 int copy_siginfo_from_user32(siginfo_t *to, struct compat_siginfo __user *from)
961 memset(to, 0, sizeof *to);
963 if (copy_from_user(to, from, 3*sizeof(int)) ||
964 copy_from_user(to->_sifields._pad,
965 from->_sifields._pad, SI_PAD_SIZE32))
970 #endif /* CONFIG_PPC64 */
973 * Set up a signal frame for a "real-time" signal handler
974 * (one which gets siginfo).
976 int handle_rt_signal32(unsigned long sig, struct k_sigaction *ka,
977 siginfo_t *info, sigset_t *oldset,
978 struct pt_regs *regs)
980 struct rt_sigframe __user *rt_sf;
981 struct mcontext __user *frame;
982 struct mcontext __user *tm_frame = NULL;
984 unsigned long newsp = 0;
988 /* Set up Signal Frame */
989 /* Put a Real Time Context onto stack */
990 rt_sf = get_sigframe(ka, get_tm_stackpointer(regs), sizeof(*rt_sf), 1);
992 if (unlikely(rt_sf == NULL))
995 /* Put the siginfo & fill in most of the ucontext */
996 if (copy_siginfo_to_user(&rt_sf->info, info)
997 || __put_user(0, &rt_sf->uc.uc_flags)
998 || __save_altstack(&rt_sf->uc.uc_stack, regs->gpr[1])
999 || __put_user(to_user_ptr(&rt_sf->uc.uc_mcontext),
1001 || put_sigset_t(&rt_sf->uc.uc_sigmask, oldset))
1004 /* Save user registers on the stack */
1005 frame = &rt_sf->uc.uc_mcontext;
1007 if (vdso32_rt_sigtramp && current->mm->context.vdso_base) {
1009 tramp = current->mm->context.vdso_base + vdso32_rt_sigtramp;
1011 sigret = __NR_rt_sigreturn;
1012 tramp = (unsigned long) frame->tramp;
1015 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1016 tm_frame = &rt_sf->uc_transact.uc_mcontext;
1017 if (MSR_TM_ACTIVE(regs->msr)) {
1018 if (save_tm_user_regs(regs, frame, tm_frame, sigret))
1024 if (save_user_regs(regs, frame, tm_frame, sigret, 1))
1029 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1030 if (MSR_TM_ACTIVE(regs->msr)) {
1031 if (__put_user((unsigned long)&rt_sf->uc_transact,
1033 || __put_user((unsigned long)tm_frame, &rt_sf->uc_transact.uc_regs))
1038 if (__put_user(0, &rt_sf->uc.uc_link))
1041 current->thread.fp_state.fpscr = 0; /* turn off all fp exceptions */
1043 /* create a stack frame for the caller of the handler */
1044 newsp = ((unsigned long)rt_sf) - (__SIGNAL_FRAMESIZE + 16);
1045 addr = (void __user *)regs->gpr[1];
1046 if (put_user(regs->gpr[1], (u32 __user *)newsp))
1049 /* Fill registers for signal handler */
1050 regs->gpr[1] = newsp;
1052 regs->gpr[4] = (unsigned long) &rt_sf->info;
1053 regs->gpr[5] = (unsigned long) &rt_sf->uc;
1054 regs->gpr[6] = (unsigned long) rt_sf;
1055 regs->nip = (unsigned long) ka->sa.sa_handler;
1056 /* enter the signal handler in native-endian mode */
1057 regs->msr &= ~MSR_LE;
1058 regs->msr |= (MSR_KERNEL & MSR_LE);
1059 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1060 /* Remove TM bits from thread's MSR. The MSR in the sigcontext
1061 * just indicates to userland that we were doing a transaction, but we
1062 * don't want to return in transactional state:
1064 regs->msr &= ~MSR_TS_MASK;
1070 printk("badframe in handle_rt_signal, regs=%p frame=%p newsp=%lx\n",
1071 regs, frame, newsp);
1073 if (show_unhandled_signals)
1074 printk_ratelimited(KERN_INFO
1075 "%s[%d]: bad frame in handle_rt_signal32: "
1076 "%p nip %08lx lr %08lx\n",
1077 current->comm, current->pid,
1078 addr, regs->nip, regs->link);
1080 force_sigsegv(sig, current);
1084 static int do_setcontext(struct ucontext __user *ucp, struct pt_regs *regs, int sig)
1087 struct mcontext __user *mcp;
1089 if (get_sigset_t(&set, &ucp->uc_sigmask))
1095 if (__get_user(cmcp, &ucp->uc_regs))
1097 mcp = (struct mcontext __user *)(u64)cmcp;
1098 /* no need to check access_ok(mcp), since mcp < 4GB */
1101 if (__get_user(mcp, &ucp->uc_regs))
1103 if (!access_ok(VERIFY_READ, mcp, sizeof(*mcp)))
1106 set_current_blocked(&set);
1107 if (restore_user_regs(regs, mcp, sig))
1113 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1114 static int do_setcontext_tm(struct ucontext __user *ucp,
1115 struct ucontext __user *tm_ucp,
1116 struct pt_regs *regs)
1119 struct mcontext __user *mcp;
1120 struct mcontext __user *tm_mcp;
1124 if (get_sigset_t(&set, &ucp->uc_sigmask))
1127 if (__get_user(cmcp, &ucp->uc_regs) ||
1128 __get_user(tm_cmcp, &tm_ucp->uc_regs))
1130 mcp = (struct mcontext __user *)(u64)cmcp;
1131 tm_mcp = (struct mcontext __user *)(u64)tm_cmcp;
1132 /* no need to check access_ok(mcp), since mcp < 4GB */
1134 set_current_blocked(&set);
1135 if (restore_tm_user_regs(regs, mcp, tm_mcp))
1142 long sys_swapcontext(struct ucontext __user *old_ctx,
1143 struct ucontext __user *new_ctx,
1144 int ctx_size, int r6, int r7, int r8, struct pt_regs *regs)
1147 int ctx_has_vsx_region = 0;
1150 unsigned long new_msr = 0;
1153 struct mcontext __user *mcp;
1157 * Get pointer to the real mcontext. No need for
1158 * access_ok since we are dealing with compat
1161 if (__get_user(cmcp, &new_ctx->uc_regs))
1163 mcp = (struct mcontext __user *)(u64)cmcp;
1164 if (__get_user(new_msr, &mcp->mc_gregs[PT_MSR]))
1168 * Check that the context is not smaller than the original
1169 * size (with VMX but without VSX)
1171 if (ctx_size < UCONTEXTSIZEWITHOUTVSX)
1174 * If the new context state sets the MSR VSX bits but
1175 * it doesn't provide VSX state.
1177 if ((ctx_size < sizeof(struct ucontext)) &&
1178 (new_msr & MSR_VSX))
1180 /* Does the context have enough room to store VSX data? */
1181 if (ctx_size >= sizeof(struct ucontext))
1182 ctx_has_vsx_region = 1;
1184 /* Context size is for future use. Right now, we only make sure
1185 * we are passed something we understand
1187 if (ctx_size < sizeof(struct ucontext))
1190 if (old_ctx != NULL) {
1191 struct mcontext __user *mctx;
1194 * old_ctx might not be 16-byte aligned, in which
1195 * case old_ctx->uc_mcontext won't be either.
1196 * Because we have the old_ctx->uc_pad2 field
1197 * before old_ctx->uc_mcontext, we need to round down
1198 * from &old_ctx->uc_mcontext to a 16-byte boundary.
1200 mctx = (struct mcontext __user *)
1201 ((unsigned long) &old_ctx->uc_mcontext & ~0xfUL);
1202 if (!access_ok(VERIFY_WRITE, old_ctx, ctx_size)
1203 || save_user_regs(regs, mctx, NULL, 0, ctx_has_vsx_region)
1204 || put_sigset_t(&old_ctx->uc_sigmask, ¤t->blocked)
1205 || __put_user(to_user_ptr(mctx), &old_ctx->uc_regs))
1208 if (new_ctx == NULL)
1210 if (!access_ok(VERIFY_READ, new_ctx, ctx_size)
1211 || __get_user(tmp, (u8 __user *) new_ctx)
1212 || __get_user(tmp, (u8 __user *) new_ctx + ctx_size - 1))
1216 * If we get a fault copying the context into the kernel's
1217 * image of the user's registers, we can't just return -EFAULT
1218 * because the user's registers will be corrupted. For instance
1219 * the NIP value may have been updated but not some of the
1220 * other registers. Given that we have done the access_ok
1221 * and successfully read the first and last bytes of the region
1222 * above, this should only happen in an out-of-memory situation
1223 * or if another thread unmaps the region containing the context.
1224 * We kill the task with a SIGSEGV in this situation.
1226 if (do_setcontext(new_ctx, regs, 0))
1229 set_thread_flag(TIF_RESTOREALL);
1233 long sys_rt_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8,
1234 struct pt_regs *regs)
1236 struct rt_sigframe __user *rt_sf;
1237 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1238 struct ucontext __user *uc_transact;
1239 unsigned long msr_hi;
1243 /* Always make any pending restarted system calls return -EINTR */
1244 current_thread_info()->restart_block.fn = do_no_restart_syscall;
1246 rt_sf = (struct rt_sigframe __user *)
1247 (regs->gpr[1] + __SIGNAL_FRAMESIZE + 16);
1248 if (!access_ok(VERIFY_READ, rt_sf, sizeof(*rt_sf)))
1250 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
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(unsigned long sig, struct k_sigaction *ka,
1421 siginfo_t *info, sigset_t *oldset, struct pt_regs *regs)
1423 struct sigcontext __user *sc;
1424 struct sigframe __user *frame;
1425 struct mcontext __user *tm_mctx = NULL;
1426 unsigned long newsp = 0;
1428 unsigned long tramp;
1430 /* Set up Signal Frame */
1431 frame = get_sigframe(ka, get_tm_stackpointer(regs), sizeof(*frame), 1);
1432 if (unlikely(frame == NULL))
1434 sc = (struct sigcontext __user *) &frame->sctx;
1437 #error "Please adjust handle_signal()"
1439 if (__put_user(to_user_ptr(ka->sa.sa_handler), &sc->handler)
1440 || __put_user(oldset->sig[0], &sc->oldmask)
1442 || __put_user((oldset->sig[0] >> 32), &sc->_unused[3])
1444 || __put_user(oldset->sig[1], &sc->_unused[3])
1446 || __put_user(to_user_ptr(&frame->mctx), &sc->regs)
1447 || __put_user(sig, &sc->signal))
1450 if (vdso32_sigtramp && current->mm->context.vdso_base) {
1452 tramp = current->mm->context.vdso_base + vdso32_sigtramp;
1454 sigret = __NR_sigreturn;
1455 tramp = (unsigned long) frame->mctx.tramp;
1458 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1459 tm_mctx = &frame->mctx_transact;
1460 if (MSR_TM_ACTIVE(regs->msr)) {
1461 if (save_tm_user_regs(regs, &frame->mctx, &frame->mctx_transact,
1468 if (save_user_regs(regs, &frame->mctx, tm_mctx, sigret, 1))
1474 current->thread.fp_state.fpscr = 0; /* turn off all fp exceptions */
1476 /* create a stack frame for the caller of the handler */
1477 newsp = ((unsigned long)frame) - __SIGNAL_FRAMESIZE;
1478 if (put_user(regs->gpr[1], (u32 __user *)newsp))
1481 regs->gpr[1] = newsp;
1483 regs->gpr[4] = (unsigned long) sc;
1484 regs->nip = (unsigned long) ka->sa.sa_handler;
1485 /* enter the signal handler in big-endian mode */
1486 regs->msr &= ~MSR_LE;
1487 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1488 /* Remove TM bits from thread's MSR. The MSR in the sigcontext
1489 * just indicates to userland that we were doing a transaction, but we
1490 * don't want to return in transactional state:
1492 regs->msr &= ~MSR_TS_MASK;
1498 printk("badframe in handle_signal, regs=%p frame=%p newsp=%lx\n",
1499 regs, frame, newsp);
1501 if (show_unhandled_signals)
1502 printk_ratelimited(KERN_INFO
1503 "%s[%d]: bad frame in handle_signal32: "
1504 "%p nip %08lx lr %08lx\n",
1505 current->comm, current->pid,
1506 frame, regs->nip, regs->link);
1508 force_sigsegv(sig, current);
1513 * Do a signal return; undo the signal stack.
1515 long sys_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8,
1516 struct pt_regs *regs)
1518 struct sigframe __user *sf;
1519 struct sigcontext __user *sc;
1520 struct sigcontext sigctx;
1521 struct mcontext __user *sr;
1524 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1525 struct mcontext __user *mcp, *tm_mcp;
1526 unsigned long msr_hi;
1529 /* Always make any pending restarted system calls return -EINTR */
1530 current_thread_info()->restart_block.fn = do_no_restart_syscall;
1532 sf = (struct sigframe __user *)(regs->gpr[1] + __SIGNAL_FRAMESIZE);
1535 if (copy_from_user(&sigctx, sc, sizeof(sigctx)))
1540 * Note that PPC32 puts the upper 32 bits of the sigmask in the
1541 * unused part of the signal stackframe
1543 set.sig[0] = sigctx.oldmask + ((long)(sigctx._unused[3]) << 32);
1545 set.sig[0] = sigctx.oldmask;
1546 set.sig[1] = sigctx._unused[3];
1548 set_current_blocked(&set);
1550 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1551 mcp = (struct mcontext __user *)&sf->mctx;
1552 tm_mcp = (struct mcontext __user *)&sf->mctx_transact;
1553 if (__get_user(msr_hi, &tm_mcp->mc_gregs[PT_MSR]))
1555 if (MSR_TM_ACTIVE(msr_hi<<32)) {
1556 if (!cpu_has_feature(CPU_FTR_TM))
1558 if (restore_tm_user_regs(regs, mcp, tm_mcp))
1563 sr = (struct mcontext __user *)from_user_ptr(sigctx.regs);
1565 if (!access_ok(VERIFY_READ, sr, sizeof(*sr))
1566 || restore_user_regs(regs, sr, 1))
1570 set_thread_flag(TIF_RESTOREALL);
1574 if (show_unhandled_signals)
1575 printk_ratelimited(KERN_INFO
1576 "%s[%d]: bad frame in sys_sigreturn: "
1577 "%p nip %08lx lr %08lx\n",
1578 current->comm, current->pid,
1579 addr, regs->nip, regs->link);
1581 force_sig(SIGSEGV, current);