2 * Signal handling for 32bit PPC and 32bit tasks on 64bit PPC
5 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
6 * Copyright (C) 2001 IBM
7 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
8 * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
10 * Derived from "arch/i386/kernel/signal.c"
11 * Copyright (C) 1991, 1992 Linus Torvalds
12 * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License
16 * as published by the Free Software Foundation; either version
17 * 2 of the License, or (at your option) any later version.
20 #include <linux/sched.h>
22 #include <linux/smp.h>
23 #include <linux/kernel.h>
24 #include <linux/signal.h>
25 #include <linux/errno.h>
26 #include <linux/elf.h>
27 #include <linux/ptrace.h>
28 #include <linux/ratelimit.h>
30 #include <linux/syscalls.h>
31 #include <linux/compat.h>
33 #include <linux/wait.h>
34 #include <linux/unistd.h>
35 #include <linux/stddef.h>
36 #include <linux/tty.h>
37 #include <linux/binfmts.h>
40 #include <asm/uaccess.h>
41 #include <asm/cacheflush.h>
42 #include <asm/syscalls.h>
43 #include <asm/sigcontext.h>
45 #include <asm/switch_to.h>
49 #include <asm/unistd.h>
51 #include <asm/ucontext.h>
52 #include <asm/pgtable.h>
60 #define sys_rt_sigreturn compat_sys_rt_sigreturn
61 #define sys_swapcontext compat_sys_swapcontext
62 #define sys_sigreturn compat_sys_sigreturn
64 #define old_sigaction old_sigaction32
65 #define sigcontext sigcontext32
66 #define mcontext mcontext32
67 #define ucontext ucontext32
69 #define __save_altstack __compat_save_altstack
72 * Userspace code may pass a ucontext which doesn't include VSX added
73 * at the end. We need to check for this case.
75 #define UCONTEXTSIZEWITHOUTVSX \
76 (sizeof(struct ucontext) - sizeof(elf_vsrreghalf_t32))
79 * Returning 0 means we return to userspace via
80 * ret_from_except and thus restore all user
81 * registers from *regs. This is what we need
82 * to do when a signal has been delivered.
85 #define GP_REGS_SIZE min(sizeof(elf_gregset_t32), sizeof(struct pt_regs32))
86 #undef __SIGNAL_FRAMESIZE
87 #define __SIGNAL_FRAMESIZE __SIGNAL_FRAMESIZE32
89 #define ELF_NVRREG ELF_NVRREG32
92 * Functions for flipping sigsets (thanks to brain dead generic
93 * implementation that makes things simple for little endian only)
95 static inline int put_sigset_t(compat_sigset_t __user *uset, sigset_t *set)
99 switch (_NSIG_WORDS) {
100 case 4: cset.sig[6] = set->sig[3] & 0xffffffffull;
101 cset.sig[7] = set->sig[3] >> 32;
102 case 3: cset.sig[4] = set->sig[2] & 0xffffffffull;
103 cset.sig[5] = set->sig[2] >> 32;
104 case 2: cset.sig[2] = set->sig[1] & 0xffffffffull;
105 cset.sig[3] = set->sig[1] >> 32;
106 case 1: cset.sig[0] = set->sig[0] & 0xffffffffull;
107 cset.sig[1] = set->sig[0] >> 32;
109 return copy_to_user(uset, &cset, sizeof(*uset));
112 static inline int get_sigset_t(sigset_t *set,
113 const compat_sigset_t __user *uset)
117 if (copy_from_user(&s32, uset, sizeof(*uset)))
121 * Swap the 2 words of the 64-bit sigset_t (they are stored
122 * in the "wrong" endian in 32-bit user storage).
124 switch (_NSIG_WORDS) {
125 case 4: set->sig[3] = s32.sig[6] | (((long)s32.sig[7]) << 32);
126 case 3: set->sig[2] = s32.sig[4] | (((long)s32.sig[5]) << 32);
127 case 2: set->sig[1] = s32.sig[2] | (((long)s32.sig[3]) << 32);
128 case 1: set->sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32);
133 #define to_user_ptr(p) ptr_to_compat(p)
134 #define from_user_ptr(p) compat_ptr(p)
136 static inline int save_general_regs(struct pt_regs *regs,
137 struct mcontext __user *frame)
139 elf_greg_t64 *gregs = (elf_greg_t64 *)regs;
142 WARN_ON(!FULL_REGS(regs));
144 for (i = 0; i <= PT_RESULT; i ++) {
145 if (i == 14 && !FULL_REGS(regs))
147 if (__put_user((unsigned int)gregs[i], &frame->mc_gregs[i]))
153 static inline int restore_general_regs(struct pt_regs *regs,
154 struct mcontext __user *sr)
156 elf_greg_t64 *gregs = (elf_greg_t64 *)regs;
159 for (i = 0; i <= PT_RESULT; i++) {
160 if ((i == PT_MSR) || (i == PT_SOFTE))
162 if (__get_user(gregs[i], &sr->mc_gregs[i]))
168 #else /* CONFIG_PPC64 */
170 #define GP_REGS_SIZE min(sizeof(elf_gregset_t), sizeof(struct pt_regs))
172 static inline int put_sigset_t(sigset_t __user *uset, sigset_t *set)
174 return copy_to_user(uset, set, sizeof(*uset));
177 static inline int get_sigset_t(sigset_t *set, const sigset_t __user *uset)
179 return copy_from_user(set, uset, sizeof(*uset));
182 #define to_user_ptr(p) ((unsigned long)(p))
183 #define from_user_ptr(p) ((void __user *)(p))
185 static inline int save_general_regs(struct pt_regs *regs,
186 struct mcontext __user *frame)
188 WARN_ON(!FULL_REGS(regs));
189 return __copy_to_user(&frame->mc_gregs, regs, GP_REGS_SIZE);
192 static inline int restore_general_regs(struct pt_regs *regs,
193 struct mcontext __user *sr)
195 /* copy up to but not including MSR */
196 if (__copy_from_user(regs, &sr->mc_gregs,
197 PT_MSR * sizeof(elf_greg_t)))
199 /* copy from orig_r3 (the word after the MSR) up to the end */
200 if (__copy_from_user(®s->orig_gpr3, &sr->mc_gregs[PT_ORIG_R3],
201 GP_REGS_SIZE - PT_ORIG_R3 * sizeof(elf_greg_t)))
208 * When we have signals to deliver, we set up on the
209 * user stack, going down from the original stack pointer:
210 * an ABI gap of 56 words
212 * a sigcontext struct
213 * a gap of __SIGNAL_FRAMESIZE bytes
215 * Each of these things must be a multiple of 16 bytes in size. The following
216 * structure represent all of this except the __SIGNAL_FRAMESIZE gap
220 struct sigcontext sctx; /* the sigcontext */
221 struct mcontext mctx; /* all the register values */
222 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
223 struct sigcontext sctx_transact;
224 struct mcontext mctx_transact;
227 * Programs using the rs6000/xcoff abi can save up to 19 gp
228 * regs and 18 fp regs below sp before decrementing it.
233 /* We use the mc_pad field for the signal return trampoline. */
237 * When we have rt signals to deliver, we set up on the
238 * user stack, going down from the original stack pointer:
239 * one rt_sigframe struct (siginfo + ucontext + ABI gap)
240 * a gap of __SIGNAL_FRAMESIZE+16 bytes
241 * (the +16 is to get the siginfo and ucontext in the same
242 * positions as in older kernels).
244 * Each of these things must be a multiple of 16 bytes in size.
249 compat_siginfo_t info;
254 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
255 struct ucontext uc_transact;
258 * Programs using the rs6000/xcoff abi can save up to 19 gp
259 * regs and 18 fp regs below sp before decrementing it.
265 unsigned long copy_fpr_to_user(void __user *to,
266 struct task_struct *task)
268 double buf[ELF_NFPREG];
271 /* save FPR copy to local buffer then write to the thread_struct */
272 for (i = 0; i < (ELF_NFPREG - 1) ; i++)
273 buf[i] = task->thread.TS_FPR(i);
274 memcpy(&buf[i], &task->thread.fpscr, sizeof(double));
275 return __copy_to_user(to, buf, ELF_NFPREG * sizeof(double));
278 unsigned long copy_fpr_from_user(struct task_struct *task,
281 double buf[ELF_NFPREG];
284 if (__copy_from_user(buf, from, ELF_NFPREG * sizeof(double)))
286 for (i = 0; i < (ELF_NFPREG - 1) ; i++)
287 task->thread.TS_FPR(i) = buf[i];
288 memcpy(&task->thread.fpscr, &buf[i], sizeof(double));
293 unsigned long copy_vsx_to_user(void __user *to,
294 struct task_struct *task)
296 double buf[ELF_NVSRHALFREG];
299 /* save FPR copy to local buffer then write to the thread_struct */
300 for (i = 0; i < ELF_NVSRHALFREG; i++)
301 buf[i] = task->thread.fpr[i][TS_VSRLOWOFFSET];
302 return __copy_to_user(to, buf, ELF_NVSRHALFREG * sizeof(double));
305 unsigned long copy_vsx_from_user(struct task_struct *task,
308 double buf[ELF_NVSRHALFREG];
311 if (__copy_from_user(buf, from, ELF_NVSRHALFREG * sizeof(double)))
313 for (i = 0; i < ELF_NVSRHALFREG ; i++)
314 task->thread.fpr[i][TS_VSRLOWOFFSET] = buf[i];
318 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
319 unsigned long copy_transact_fpr_to_user(void __user *to,
320 struct task_struct *task)
322 double buf[ELF_NFPREG];
325 /* save FPR copy to local buffer then write to the thread_struct */
326 for (i = 0; i < (ELF_NFPREG - 1) ; i++)
327 buf[i] = task->thread.TS_TRANS_FPR(i);
328 memcpy(&buf[i], &task->thread.transact_fpscr, sizeof(double));
329 return __copy_to_user(to, buf, ELF_NFPREG * sizeof(double));
332 unsigned long copy_transact_fpr_from_user(struct task_struct *task,
335 double buf[ELF_NFPREG];
338 if (__copy_from_user(buf, from, ELF_NFPREG * sizeof(double)))
340 for (i = 0; i < (ELF_NFPREG - 1) ; i++)
341 task->thread.TS_TRANS_FPR(i) = buf[i];
342 memcpy(&task->thread.transact_fpscr, &buf[i], sizeof(double));
347 unsigned long copy_transact_vsx_to_user(void __user *to,
348 struct task_struct *task)
350 double buf[ELF_NVSRHALFREG];
353 /* save FPR copy to local buffer then write to the thread_struct */
354 for (i = 0; i < ELF_NVSRHALFREG; i++)
355 buf[i] = task->thread.transact_fpr[i][TS_VSRLOWOFFSET];
356 return __copy_to_user(to, buf, ELF_NVSRHALFREG * sizeof(double));
359 unsigned long copy_transact_vsx_from_user(struct task_struct *task,
362 double buf[ELF_NVSRHALFREG];
365 if (__copy_from_user(buf, from, ELF_NVSRHALFREG * sizeof(double)))
367 for (i = 0; i < ELF_NVSRHALFREG ; i++)
368 task->thread.transact_fpr[i][TS_VSRLOWOFFSET] = buf[i];
371 #endif /* CONFIG_PPC_TRANSACTIONAL_MEM */
373 inline unsigned long copy_fpr_to_user(void __user *to,
374 struct task_struct *task)
376 return __copy_to_user(to, task->thread.fpr,
377 ELF_NFPREG * sizeof(double));
380 inline unsigned long copy_fpr_from_user(struct task_struct *task,
383 return __copy_from_user(task->thread.fpr, from,
384 ELF_NFPREG * sizeof(double));
387 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
388 inline unsigned long copy_transact_fpr_to_user(void __user *to,
389 struct task_struct *task)
391 return __copy_to_user(to, task->thread.transact_fpr,
392 ELF_NFPREG * sizeof(double));
395 inline unsigned long copy_transact_fpr_from_user(struct task_struct *task,
398 return __copy_from_user(task->thread.transact_fpr, from,
399 ELF_NFPREG * sizeof(double));
401 #endif /* CONFIG_PPC_TRANSACTIONAL_MEM */
405 * Save the current user registers on the user stack.
406 * We only save the altivec/spe registers if the process has used
407 * altivec/spe instructions at some point.
409 static int save_user_regs(struct pt_regs *regs, struct mcontext __user *frame,
410 struct mcontext __user *tm_frame, int sigret,
411 int ctx_has_vsx_region)
413 unsigned long msr = regs->msr;
415 /* Make sure floating point registers are stored in regs */
416 flush_fp_to_thread(current);
418 /* save general registers */
419 if (save_general_regs(regs, frame))
422 #ifdef CONFIG_ALTIVEC
423 /* save altivec registers */
424 if (current->thread.used_vr) {
425 flush_altivec_to_thread(current);
426 if (__copy_to_user(&frame->mc_vregs, current->thread.vr,
427 ELF_NVRREG * sizeof(vector128)))
429 /* set MSR_VEC in the saved MSR value to indicate that
430 frame->mc_vregs contains valid data */
433 /* else assert((regs->msr & MSR_VEC) == 0) */
435 /* We always copy to/from vrsave, it's 0 if we don't have or don't
436 * use altivec. Since VSCR only contains 32 bits saved in the least
437 * significant bits of a vector, we "cheat" and stuff VRSAVE in the
438 * most significant bits of that same vector. --BenH
440 if (__put_user(current->thread.vrsave, (u32 __user *)&frame->mc_vregs[32]))
442 #endif /* CONFIG_ALTIVEC */
443 if (copy_fpr_to_user(&frame->mc_fregs, current))
447 * Copy VSR 0-31 upper half from thread_struct to local
448 * buffer, then write that to userspace. Also set MSR_VSX in
449 * the saved MSR value to indicate that frame->mc_vregs
450 * contains valid data
452 if (current->thread.used_vsr && ctx_has_vsx_region) {
453 __giveup_vsx(current);
454 if (copy_vsx_to_user(&frame->mc_vsregs, current))
458 #endif /* CONFIG_VSX */
460 /* save spe registers */
461 if (current->thread.used_spe) {
462 flush_spe_to_thread(current);
463 if (__copy_to_user(&frame->mc_vregs, current->thread.evr,
464 ELF_NEVRREG * sizeof(u32)))
466 /* set MSR_SPE in the saved MSR value to indicate that
467 frame->mc_vregs contains valid data */
470 /* else assert((regs->msr & MSR_SPE) == 0) */
472 /* We always copy to/from spefscr */
473 if (__put_user(current->thread.spefscr, (u32 __user *)&frame->mc_vregs + ELF_NEVRREG))
475 #endif /* CONFIG_SPE */
477 if (__put_user(msr, &frame->mc_gregs[PT_MSR]))
479 /* We need to write 0 the MSR top 32 bits in the tm frame so that we
480 * can check it on the restore to see if TM is active
482 if (tm_frame && __put_user(0, &tm_frame->mc_gregs[PT_MSR]))
486 /* Set up the sigreturn trampoline: li r0,sigret; sc */
487 if (__put_user(0x38000000UL + sigret, &frame->tramp[0])
488 || __put_user(0x44000002UL, &frame->tramp[1]))
490 flush_icache_range((unsigned long) &frame->tramp[0],
491 (unsigned long) &frame->tramp[2]);
497 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
499 * Save the current user registers on the user stack.
500 * We only save the altivec/spe registers if the process has used
501 * altivec/spe instructions at some point.
502 * We also save the transactional registers to a second ucontext in the
505 * See save_user_regs() and signal_64.c:setup_tm_sigcontexts().
507 static int save_tm_user_regs(struct pt_regs *regs,
508 struct mcontext __user *frame,
509 struct mcontext __user *tm_frame, int sigret)
511 unsigned long msr = regs->msr;
513 /* Make sure floating point registers are stored in regs */
514 flush_fp_to_thread(current);
516 /* Save both sets of general registers */
517 if (save_general_regs(¤t->thread.ckpt_regs, frame)
518 || save_general_regs(regs, tm_frame))
521 /* Stash the top half of the 64bit MSR into the 32bit MSR word
522 * of the transactional mcontext. This way we have a backward-compatible
523 * MSR in the 'normal' (checkpointed) mcontext and additionally one can
524 * also look at what type of transaction (T or S) was active at the
525 * time of the signal.
527 if (__put_user((msr >> 32), &tm_frame->mc_gregs[PT_MSR]))
530 #ifdef CONFIG_ALTIVEC
531 /* save altivec registers */
532 if (current->thread.used_vr) {
533 flush_altivec_to_thread(current);
534 if (__copy_to_user(&frame->mc_vregs, current->thread.vr,
535 ELF_NVRREG * sizeof(vector128)))
538 if (__copy_to_user(&tm_frame->mc_vregs,
539 current->thread.transact_vr,
540 ELF_NVRREG * sizeof(vector128)))
543 if (__copy_to_user(&tm_frame->mc_vregs,
545 ELF_NVRREG * sizeof(vector128)))
549 /* set MSR_VEC in the saved MSR value to indicate that
550 * frame->mc_vregs contains valid data
555 /* We always copy to/from vrsave, it's 0 if we don't have or don't
556 * use altivec. Since VSCR only contains 32 bits saved in the least
557 * significant bits of a vector, we "cheat" and stuff VRSAVE in the
558 * most significant bits of that same vector. --BenH
560 if (__put_user(current->thread.vrsave,
561 (u32 __user *)&frame->mc_vregs[32]))
564 if (__put_user(current->thread.transact_vrsave,
565 (u32 __user *)&tm_frame->mc_vregs[32]))
568 if (__put_user(current->thread.vrsave,
569 (u32 __user *)&tm_frame->mc_vregs[32]))
572 #endif /* CONFIG_ALTIVEC */
574 if (copy_fpr_to_user(&frame->mc_fregs, current))
577 if (copy_transact_fpr_to_user(&tm_frame->mc_fregs, current))
580 if (copy_fpr_to_user(&tm_frame->mc_fregs, current))
586 * Copy VSR 0-31 upper half from thread_struct to local
587 * buffer, then write that to userspace. Also set MSR_VSX in
588 * the saved MSR value to indicate that frame->mc_vregs
589 * contains valid data
591 if (current->thread.used_vsr) {
592 __giveup_vsx(current);
593 if (copy_vsx_to_user(&frame->mc_vsregs, current))
596 if (copy_transact_vsx_to_user(&tm_frame->mc_vsregs,
600 if (copy_vsx_to_user(&tm_frame->mc_vsregs, current))
606 #endif /* CONFIG_VSX */
608 /* SPE regs are not checkpointed with TM, so this section is
609 * simply the same as in save_user_regs().
611 if (current->thread.used_spe) {
612 flush_spe_to_thread(current);
613 if (__copy_to_user(&frame->mc_vregs, current->thread.evr,
614 ELF_NEVRREG * sizeof(u32)))
616 /* set MSR_SPE in the saved MSR value to indicate that
617 * frame->mc_vregs contains valid data */
621 /* We always copy to/from spefscr */
622 if (__put_user(current->thread.spefscr, (u32 __user *)&frame->mc_vregs + ELF_NEVRREG))
624 #endif /* CONFIG_SPE */
626 if (__put_user(msr, &frame->mc_gregs[PT_MSR]))
629 /* Set up the sigreturn trampoline: li r0,sigret; sc */
630 if (__put_user(0x38000000UL + sigret, &frame->tramp[0])
631 || __put_user(0x44000002UL, &frame->tramp[1]))
633 flush_icache_range((unsigned long) &frame->tramp[0],
634 (unsigned long) &frame->tramp[2]);
642 * Restore the current user register values from the user stack,
645 static long restore_user_regs(struct pt_regs *regs,
646 struct mcontext __user *sr, int sig)
649 unsigned int save_r2 = 0;
656 * restore general registers but not including MSR or SOFTE. Also
657 * take care of keeping r2 (TLS) intact if not a signal
660 save_r2 = (unsigned int)regs->gpr[2];
661 err = restore_general_regs(regs, sr);
663 err |= __get_user(msr, &sr->mc_gregs[PT_MSR]);
665 regs->gpr[2] = (unsigned long) save_r2;
669 /* if doing signal return, restore the previous little-endian mode */
671 regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE);
674 * Do this before updating the thread state in
675 * current->thread.fpr/vr/evr. That way, if we get preempted
676 * and another task grabs the FPU/Altivec/SPE, it won't be
677 * tempted to save the current CPU state into the thread_struct
678 * and corrupt what we are writing there.
680 discard_lazy_cpu_state();
682 #ifdef CONFIG_ALTIVEC
684 * Force the process to reload the altivec registers from
685 * current->thread when it next does altivec instructions
687 regs->msr &= ~MSR_VEC;
689 /* restore altivec registers from the stack */
690 if (__copy_from_user(current->thread.vr, &sr->mc_vregs,
691 sizeof(sr->mc_vregs)))
693 } else if (current->thread.used_vr)
694 memset(current->thread.vr, 0, ELF_NVRREG * sizeof(vector128));
696 /* Always get VRSAVE back */
697 if (__get_user(current->thread.vrsave, (u32 __user *)&sr->mc_vregs[32]))
699 #endif /* CONFIG_ALTIVEC */
700 if (copy_fpr_from_user(current, &sr->mc_fregs))
705 * Force the process to reload the VSX registers from
706 * current->thread when it next does VSX instruction.
708 regs->msr &= ~MSR_VSX;
711 * Restore altivec registers from the stack to a local
712 * buffer, then write this out to the thread_struct
714 if (copy_vsx_from_user(current, &sr->mc_vsregs))
716 } else if (current->thread.used_vsr)
717 for (i = 0; i < 32 ; i++)
718 current->thread.fpr[i][TS_VSRLOWOFFSET] = 0;
719 #endif /* CONFIG_VSX */
721 * force the process to reload the FP registers from
722 * current->thread when it next does FP instructions
724 regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1);
727 /* force the process to reload the spe registers from
728 current->thread when it next does spe instructions */
729 regs->msr &= ~MSR_SPE;
731 /* restore spe registers from the stack */
732 if (__copy_from_user(current->thread.evr, &sr->mc_vregs,
733 ELF_NEVRREG * sizeof(u32)))
735 } else if (current->thread.used_spe)
736 memset(current->thread.evr, 0, ELF_NEVRREG * sizeof(u32));
738 /* Always get SPEFSCR back */
739 if (__get_user(current->thread.spefscr, (u32 __user *)&sr->mc_vregs + ELF_NEVRREG))
741 #endif /* CONFIG_SPE */
746 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
748 * Restore the current user register values from the user stack, except for
749 * MSR, and recheckpoint the original checkpointed register state for processes
752 static long restore_tm_user_regs(struct pt_regs *regs,
753 struct mcontext __user *sr,
754 struct mcontext __user *tm_sr)
757 unsigned long msr, msr_hi;
763 * restore general registers but not including MSR or SOFTE. Also
764 * take care of keeping r2 (TLS) intact if not a signal.
765 * See comment in signal_64.c:restore_tm_sigcontexts();
766 * TFHAR is restored from the checkpointed NIP; TEXASR and TFIAR
767 * were set by the signal delivery.
769 err = restore_general_regs(regs, tm_sr);
770 err |= restore_general_regs(¤t->thread.ckpt_regs, sr);
772 err |= __get_user(current->thread.tm_tfhar, &sr->mc_gregs[PT_NIP]);
774 err |= __get_user(msr, &sr->mc_gregs[PT_MSR]);
778 /* Restore the previous little-endian mode */
779 regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE);
782 * Do this before updating the thread state in
783 * current->thread.fpr/vr/evr. That way, if we get preempted
784 * and another task grabs the FPU/Altivec/SPE, it won't be
785 * tempted to save the current CPU state into the thread_struct
786 * and corrupt what we are writing there.
788 discard_lazy_cpu_state();
790 #ifdef CONFIG_ALTIVEC
791 regs->msr &= ~MSR_VEC;
793 /* restore altivec registers from the stack */
794 if (__copy_from_user(current->thread.vr, &sr->mc_vregs,
795 sizeof(sr->mc_vregs)) ||
796 __copy_from_user(current->thread.transact_vr,
798 sizeof(sr->mc_vregs)))
800 } else if (current->thread.used_vr) {
801 memset(current->thread.vr, 0, ELF_NVRREG * sizeof(vector128));
802 memset(current->thread.transact_vr, 0,
803 ELF_NVRREG * sizeof(vector128));
806 /* Always get VRSAVE back */
807 if (__get_user(current->thread.vrsave,
808 (u32 __user *)&sr->mc_vregs[32]) ||
809 __get_user(current->thread.transact_vrsave,
810 (u32 __user *)&tm_sr->mc_vregs[32]))
812 #endif /* CONFIG_ALTIVEC */
814 regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1);
816 if (copy_fpr_from_user(current, &sr->mc_fregs) ||
817 copy_transact_fpr_from_user(current, &tm_sr->mc_fregs))
821 regs->msr &= ~MSR_VSX;
824 * Restore altivec registers from the stack to a local
825 * buffer, then write this out to the thread_struct
827 if (copy_vsx_from_user(current, &sr->mc_vsregs) ||
828 copy_transact_vsx_from_user(current, &tm_sr->mc_vsregs))
830 } else if (current->thread.used_vsr)
831 for (i = 0; i < 32 ; i++) {
832 current->thread.fpr[i][TS_VSRLOWOFFSET] = 0;
833 current->thread.transact_fpr[i][TS_VSRLOWOFFSET] = 0;
835 #endif /* CONFIG_VSX */
838 /* SPE regs are not checkpointed with TM, so this section is
839 * simply the same as in restore_user_regs().
841 regs->msr &= ~MSR_SPE;
843 if (__copy_from_user(current->thread.evr, &sr->mc_vregs,
844 ELF_NEVRREG * sizeof(u32)))
846 } else if (current->thread.used_spe)
847 memset(current->thread.evr, 0, ELF_NEVRREG * sizeof(u32));
849 /* Always get SPEFSCR back */
850 if (__get_user(current->thread.spefscr, (u32 __user *)&sr->mc_vregs
853 #endif /* CONFIG_SPE */
855 /* Now, recheckpoint. This loads up all of the checkpointed (older)
856 * registers, including FP and V[S]Rs. After recheckpointing, the
857 * transactional versions should be loaded.
860 /* This loads the checkpointed FP/VEC state, if used */
861 tm_recheckpoint(¤t->thread, msr);
862 /* Get the top half of the MSR */
863 if (__get_user(msr_hi, &tm_sr->mc_gregs[PT_MSR]))
865 /* Pull in MSR TM from user context */
866 regs->msr = (regs->msr & ~MSR_TS_MASK) | ((msr_hi<<32) & MSR_TS_MASK);
868 /* This loads the speculative FP/VEC state, if used */
870 do_load_up_transact_fpu(¤t->thread);
871 regs->msr |= (MSR_FP | current->thread.fpexc_mode);
873 #ifdef CONFIG_ALTIVEC
875 do_load_up_transact_altivec(¤t->thread);
876 regs->msr |= MSR_VEC;
885 int copy_siginfo_to_user32(struct compat_siginfo __user *d, siginfo_t *s)
889 if (!access_ok (VERIFY_WRITE, d, sizeof(*d)))
892 /* If you change siginfo_t structure, please be sure
893 * this code is fixed accordingly.
894 * It should never copy any pad contained in the structure
895 * to avoid security leaks, but must copy the generic
896 * 3 ints plus the relevant union member.
897 * This routine must convert siginfo from 64bit to 32bit as well
900 err = __put_user(s->si_signo, &d->si_signo);
901 err |= __put_user(s->si_errno, &d->si_errno);
902 err |= __put_user((short)s->si_code, &d->si_code);
904 err |= __copy_to_user(&d->_sifields._pad, &s->_sifields._pad,
906 else switch(s->si_code >> 16) {
907 case __SI_CHLD >> 16:
908 err |= __put_user(s->si_pid, &d->si_pid);
909 err |= __put_user(s->si_uid, &d->si_uid);
910 err |= __put_user(s->si_utime, &d->si_utime);
911 err |= __put_user(s->si_stime, &d->si_stime);
912 err |= __put_user(s->si_status, &d->si_status);
914 case __SI_FAULT >> 16:
915 err |= __put_user((unsigned int)(unsigned long)s->si_addr,
918 case __SI_POLL >> 16:
919 err |= __put_user(s->si_band, &d->si_band);
920 err |= __put_user(s->si_fd, &d->si_fd);
922 case __SI_TIMER >> 16:
923 err |= __put_user(s->si_tid, &d->si_tid);
924 err |= __put_user(s->si_overrun, &d->si_overrun);
925 err |= __put_user(s->si_int, &d->si_int);
927 case __SI_RT >> 16: /* This is not generated by the kernel as of now. */
928 case __SI_MESGQ >> 16:
929 err |= __put_user(s->si_int, &d->si_int);
931 case __SI_KILL >> 16:
933 err |= __put_user(s->si_pid, &d->si_pid);
934 err |= __put_user(s->si_uid, &d->si_uid);
940 #define copy_siginfo_to_user copy_siginfo_to_user32
942 int copy_siginfo_from_user32(siginfo_t *to, struct compat_siginfo __user *from)
944 memset(to, 0, sizeof *to);
946 if (copy_from_user(to, from, 3*sizeof(int)) ||
947 copy_from_user(to->_sifields._pad,
948 from->_sifields._pad, SI_PAD_SIZE32))
953 #endif /* CONFIG_PPC64 */
956 * Set up a signal frame for a "real-time" signal handler
957 * (one which gets siginfo).
959 int handle_rt_signal32(unsigned long sig, struct k_sigaction *ka,
960 siginfo_t *info, sigset_t *oldset,
961 struct pt_regs *regs)
963 struct rt_sigframe __user *rt_sf;
964 struct mcontext __user *frame;
965 struct mcontext __user *tm_frame = NULL;
967 unsigned long newsp = 0;
971 /* Set up Signal Frame */
972 /* Put a Real Time Context onto stack */
973 rt_sf = get_sigframe(ka, get_tm_stackpointer(regs), sizeof(*rt_sf), 1);
975 if (unlikely(rt_sf == NULL))
978 /* Put the siginfo & fill in most of the ucontext */
979 if (copy_siginfo_to_user(&rt_sf->info, info)
980 || __put_user(0, &rt_sf->uc.uc_flags)
981 || __save_altstack(&rt_sf->uc.uc_stack, regs->gpr[1])
982 || __put_user(to_user_ptr(&rt_sf->uc.uc_mcontext),
984 || put_sigset_t(&rt_sf->uc.uc_sigmask, oldset))
987 /* Save user registers on the stack */
988 frame = &rt_sf->uc.uc_mcontext;
990 if (vdso32_rt_sigtramp && current->mm->context.vdso_base) {
992 tramp = current->mm->context.vdso_base + vdso32_rt_sigtramp;
994 sigret = __NR_rt_sigreturn;
995 tramp = (unsigned long) frame->tramp;
998 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
999 tm_frame = &rt_sf->uc_transact.uc_mcontext;
1000 if (MSR_TM_ACTIVE(regs->msr)) {
1001 if (save_tm_user_regs(regs, frame, tm_frame, sigret))
1007 if (save_user_regs(regs, frame, tm_frame, sigret, 1))
1012 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1013 if (MSR_TM_ACTIVE(regs->msr)) {
1014 if (__put_user((unsigned long)&rt_sf->uc_transact,
1016 || __put_user((unsigned long)tm_frame, &rt_sf->uc_transact.uc_regs))
1021 if (__put_user(0, &rt_sf->uc.uc_link))
1024 current->thread.fpscr.val = 0; /* turn off all fp exceptions */
1026 /* create a stack frame for the caller of the handler */
1027 newsp = ((unsigned long)rt_sf) - (__SIGNAL_FRAMESIZE + 16);
1028 addr = (void __user *)regs->gpr[1];
1029 if (put_user(regs->gpr[1], (u32 __user *)newsp))
1032 /* Fill registers for signal handler */
1033 regs->gpr[1] = newsp;
1035 regs->gpr[4] = (unsigned long) &rt_sf->info;
1036 regs->gpr[5] = (unsigned long) &rt_sf->uc;
1037 regs->gpr[6] = (unsigned long) rt_sf;
1038 regs->nip = (unsigned long) ka->sa.sa_handler;
1039 /* enter the signal handler in big-endian mode */
1040 regs->msr &= ~MSR_LE;
1041 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1042 /* Remove TM bits from thread's MSR. The MSR in the sigcontext
1043 * just indicates to userland that we were doing a transaction, but we
1044 * don't want to return in transactional state:
1046 regs->msr &= ~MSR_TS_MASK;
1052 printk("badframe in handle_rt_signal, regs=%p frame=%p newsp=%lx\n",
1053 regs, frame, newsp);
1055 if (show_unhandled_signals)
1056 printk_ratelimited(KERN_INFO
1057 "%s[%d]: bad frame in handle_rt_signal32: "
1058 "%p nip %08lx lr %08lx\n",
1059 current->comm, current->pid,
1060 addr, regs->nip, regs->link);
1062 force_sigsegv(sig, current);
1066 static int do_setcontext(struct ucontext __user *ucp, struct pt_regs *regs, int sig)
1069 struct mcontext __user *mcp;
1071 if (get_sigset_t(&set, &ucp->uc_sigmask))
1077 if (__get_user(cmcp, &ucp->uc_regs))
1079 mcp = (struct mcontext __user *)(u64)cmcp;
1080 /* no need to check access_ok(mcp), since mcp < 4GB */
1083 if (__get_user(mcp, &ucp->uc_regs))
1085 if (!access_ok(VERIFY_READ, mcp, sizeof(*mcp)))
1088 set_current_blocked(&set);
1089 if (restore_user_regs(regs, mcp, sig))
1095 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1096 static int do_setcontext_tm(struct ucontext __user *ucp,
1097 struct ucontext __user *tm_ucp,
1098 struct pt_regs *regs)
1101 struct mcontext __user *mcp;
1102 struct mcontext __user *tm_mcp;
1106 if (get_sigset_t(&set, &ucp->uc_sigmask))
1109 if (__get_user(cmcp, &ucp->uc_regs) ||
1110 __get_user(tm_cmcp, &tm_ucp->uc_regs))
1112 mcp = (struct mcontext __user *)(u64)cmcp;
1113 tm_mcp = (struct mcontext __user *)(u64)tm_cmcp;
1114 /* no need to check access_ok(mcp), since mcp < 4GB */
1116 set_current_blocked(&set);
1117 if (restore_tm_user_regs(regs, mcp, tm_mcp))
1124 long sys_swapcontext(struct ucontext __user *old_ctx,
1125 struct ucontext __user *new_ctx,
1126 int ctx_size, int r6, int r7, int r8, struct pt_regs *regs)
1129 int ctx_has_vsx_region = 0;
1132 unsigned long new_msr = 0;
1135 struct mcontext __user *mcp;
1139 * Get pointer to the real mcontext. No need for
1140 * access_ok since we are dealing with compat
1143 if (__get_user(cmcp, &new_ctx->uc_regs))
1145 mcp = (struct mcontext __user *)(u64)cmcp;
1146 if (__get_user(new_msr, &mcp->mc_gregs[PT_MSR]))
1150 * Check that the context is not smaller than the original
1151 * size (with VMX but without VSX)
1153 if (ctx_size < UCONTEXTSIZEWITHOUTVSX)
1156 * If the new context state sets the MSR VSX bits but
1157 * it doesn't provide VSX state.
1159 if ((ctx_size < sizeof(struct ucontext)) &&
1160 (new_msr & MSR_VSX))
1162 /* Does the context have enough room to store VSX data? */
1163 if (ctx_size >= sizeof(struct ucontext))
1164 ctx_has_vsx_region = 1;
1166 /* Context size is for future use. Right now, we only make sure
1167 * we are passed something we understand
1169 if (ctx_size < sizeof(struct ucontext))
1172 if (old_ctx != NULL) {
1173 struct mcontext __user *mctx;
1176 * old_ctx might not be 16-byte aligned, in which
1177 * case old_ctx->uc_mcontext won't be either.
1178 * Because we have the old_ctx->uc_pad2 field
1179 * before old_ctx->uc_mcontext, we need to round down
1180 * from &old_ctx->uc_mcontext to a 16-byte boundary.
1182 mctx = (struct mcontext __user *)
1183 ((unsigned long) &old_ctx->uc_mcontext & ~0xfUL);
1184 if (!access_ok(VERIFY_WRITE, old_ctx, ctx_size)
1185 || save_user_regs(regs, mctx, NULL, 0, ctx_has_vsx_region)
1186 || put_sigset_t(&old_ctx->uc_sigmask, ¤t->blocked)
1187 || __put_user(to_user_ptr(mctx), &old_ctx->uc_regs))
1190 if (new_ctx == NULL)
1192 if (!access_ok(VERIFY_READ, new_ctx, ctx_size)
1193 || __get_user(tmp, (u8 __user *) new_ctx)
1194 || __get_user(tmp, (u8 __user *) new_ctx + ctx_size - 1))
1198 * If we get a fault copying the context into the kernel's
1199 * image of the user's registers, we can't just return -EFAULT
1200 * because the user's registers will be corrupted. For instance
1201 * the NIP value may have been updated but not some of the
1202 * other registers. Given that we have done the access_ok
1203 * and successfully read the first and last bytes of the region
1204 * above, this should only happen in an out-of-memory situation
1205 * or if another thread unmaps the region containing the context.
1206 * We kill the task with a SIGSEGV in this situation.
1208 if (do_setcontext(new_ctx, regs, 0))
1211 set_thread_flag(TIF_RESTOREALL);
1215 long sys_rt_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8,
1216 struct pt_regs *regs)
1218 struct rt_sigframe __user *rt_sf;
1219 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1220 struct ucontext __user *uc_transact;
1221 unsigned long msr_hi;
1225 /* Always make any pending restarted system calls return -EINTR */
1226 current_thread_info()->restart_block.fn = do_no_restart_syscall;
1228 rt_sf = (struct rt_sigframe __user *)
1229 (regs->gpr[1] + __SIGNAL_FRAMESIZE + 16);
1230 if (!access_ok(VERIFY_READ, rt_sf, sizeof(*rt_sf)))
1232 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1233 if (__get_user(tmp, &rt_sf->uc.uc_link))
1235 uc_transact = (struct ucontext __user *)(uintptr_t)tmp;
1238 struct mcontext __user *mcp;
1240 if (__get_user(cmcp, &uc_transact->uc_regs))
1242 mcp = (struct mcontext __user *)(u64)cmcp;
1243 /* The top 32 bits of the MSR are stashed in the transactional
1245 if (__get_user(msr_hi, &mcp->mc_gregs[PT_MSR]))
1248 if (MSR_TM_ACTIVE(msr_hi<<32)) {
1249 /* We only recheckpoint on return if we're
1253 if (do_setcontext_tm(&rt_sf->uc, uc_transact, regs))
1258 /* Fall through, for non-TM restore */
1260 if (do_setcontext(&rt_sf->uc, regs, 1))
1264 * It's not clear whether or why it is desirable to save the
1265 * sigaltstack setting on signal delivery and restore it on
1266 * signal return. But other architectures do this and we have
1267 * always done it up until now so it is probably better not to
1268 * change it. -- paulus
1271 if (compat_restore_altstack(&rt_sf->uc.uc_stack))
1274 if (restore_altstack(&rt_sf->uc.uc_stack))
1277 set_thread_flag(TIF_RESTOREALL);
1281 if (show_unhandled_signals)
1282 printk_ratelimited(KERN_INFO
1283 "%s[%d]: bad frame in sys_rt_sigreturn: "
1284 "%p nip %08lx lr %08lx\n",
1285 current->comm, current->pid,
1286 rt_sf, regs->nip, regs->link);
1288 force_sig(SIGSEGV, current);
1293 int sys_debug_setcontext(struct ucontext __user *ctx,
1294 int ndbg, struct sig_dbg_op __user *dbg,
1295 int r6, int r7, int r8,
1296 struct pt_regs *regs)
1298 struct sig_dbg_op op;
1301 unsigned long new_msr = regs->msr;
1302 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
1303 unsigned long new_dbcr0 = current->thread.dbcr0;
1306 for (i=0; i<ndbg; i++) {
1307 if (copy_from_user(&op, dbg + i, sizeof(op)))
1309 switch (op.dbg_type) {
1310 case SIG_DBG_SINGLE_STEPPING:
1311 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
1314 new_dbcr0 |= (DBCR0_IDM | DBCR0_IC);
1316 new_dbcr0 &= ~DBCR0_IC;
1317 if (!DBCR_ACTIVE_EVENTS(new_dbcr0,
1318 current->thread.dbcr1)) {
1320 new_dbcr0 &= ~DBCR0_IDM;
1330 case SIG_DBG_BRANCH_TRACING:
1331 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
1346 /* We wait until here to actually install the values in the
1347 registers so if we fail in the above loop, it will not
1348 affect the contents of these registers. After this point,
1349 failure is a problem, anyway, and it's very unlikely unless
1350 the user is really doing something wrong. */
1351 regs->msr = new_msr;
1352 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
1353 current->thread.dbcr0 = new_dbcr0;
1356 if (!access_ok(VERIFY_READ, ctx, sizeof(*ctx))
1357 || __get_user(tmp, (u8 __user *) ctx)
1358 || __get_user(tmp, (u8 __user *) (ctx + 1) - 1))
1362 * If we get a fault copying the context into the kernel's
1363 * image of the user's registers, we can't just return -EFAULT
1364 * because the user's registers will be corrupted. For instance
1365 * the NIP value may have been updated but not some of the
1366 * other registers. Given that we have done the access_ok
1367 * and successfully read the first and last bytes of the region
1368 * above, this should only happen in an out-of-memory situation
1369 * or if another thread unmaps the region containing the context.
1370 * We kill the task with a SIGSEGV in this situation.
1372 if (do_setcontext(ctx, regs, 1)) {
1373 if (show_unhandled_signals)
1374 printk_ratelimited(KERN_INFO "%s[%d]: bad frame in "
1375 "sys_debug_setcontext: %p nip %08lx "
1377 current->comm, current->pid,
1378 ctx, regs->nip, regs->link);
1380 force_sig(SIGSEGV, current);
1385 * It's not clear whether or why it is desirable to save the
1386 * sigaltstack setting on signal delivery and restore it on
1387 * signal return. But other architectures do this and we have
1388 * always done it up until now so it is probably better not to
1389 * change it. -- paulus
1391 restore_altstack(&ctx->uc_stack);
1393 set_thread_flag(TIF_RESTOREALL);
1400 * OK, we're invoking a handler
1402 int handle_signal32(unsigned long sig, struct k_sigaction *ka,
1403 siginfo_t *info, sigset_t *oldset, struct pt_regs *regs)
1405 struct sigcontext __user *sc;
1406 struct sigframe __user *frame;
1407 struct mcontext __user *tm_mctx = NULL;
1408 unsigned long newsp = 0;
1410 unsigned long tramp;
1412 /* Set up Signal Frame */
1413 frame = get_sigframe(ka, get_tm_stackpointer(regs), sizeof(*frame), 1);
1414 if (unlikely(frame == NULL))
1416 sc = (struct sigcontext __user *) &frame->sctx;
1419 #error "Please adjust handle_signal()"
1421 if (__put_user(to_user_ptr(ka->sa.sa_handler), &sc->handler)
1422 || __put_user(oldset->sig[0], &sc->oldmask)
1424 || __put_user((oldset->sig[0] >> 32), &sc->_unused[3])
1426 || __put_user(oldset->sig[1], &sc->_unused[3])
1428 || __put_user(to_user_ptr(&frame->mctx), &sc->regs)
1429 || __put_user(sig, &sc->signal))
1432 if (vdso32_sigtramp && current->mm->context.vdso_base) {
1434 tramp = current->mm->context.vdso_base + vdso32_sigtramp;
1436 sigret = __NR_sigreturn;
1437 tramp = (unsigned long) frame->mctx.tramp;
1440 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1441 tm_mctx = &frame->mctx_transact;
1442 if (MSR_TM_ACTIVE(regs->msr)) {
1443 if (save_tm_user_regs(regs, &frame->mctx, &frame->mctx_transact,
1450 if (save_user_regs(regs, &frame->mctx, tm_mctx, sigret, 1))
1456 current->thread.fpscr.val = 0; /* turn off all fp exceptions */
1458 /* create a stack frame for the caller of the handler */
1459 newsp = ((unsigned long)frame) - __SIGNAL_FRAMESIZE;
1460 if (put_user(regs->gpr[1], (u32 __user *)newsp))
1463 regs->gpr[1] = newsp;
1465 regs->gpr[4] = (unsigned long) sc;
1466 regs->nip = (unsigned long) ka->sa.sa_handler;
1467 /* enter the signal handler in big-endian mode */
1468 regs->msr &= ~MSR_LE;
1469 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1470 /* Remove TM bits from thread's MSR. The MSR in the sigcontext
1471 * just indicates to userland that we were doing a transaction, but we
1472 * don't want to return in transactional state:
1474 regs->msr &= ~MSR_TS_MASK;
1480 printk("badframe in handle_signal, regs=%p frame=%p newsp=%lx\n",
1481 regs, frame, newsp);
1483 if (show_unhandled_signals)
1484 printk_ratelimited(KERN_INFO
1485 "%s[%d]: bad frame in handle_signal32: "
1486 "%p nip %08lx lr %08lx\n",
1487 current->comm, current->pid,
1488 frame, regs->nip, regs->link);
1490 force_sigsegv(sig, current);
1495 * Do a signal return; undo the signal stack.
1497 long sys_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8,
1498 struct pt_regs *regs)
1500 struct sigframe __user *sf;
1501 struct sigcontext __user *sc;
1502 struct sigcontext sigctx;
1503 struct mcontext __user *sr;
1506 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1507 struct mcontext __user *mcp, *tm_mcp;
1508 unsigned long msr_hi;
1511 /* Always make any pending restarted system calls return -EINTR */
1512 current_thread_info()->restart_block.fn = do_no_restart_syscall;
1514 sf = (struct sigframe __user *)(regs->gpr[1] + __SIGNAL_FRAMESIZE);
1517 if (copy_from_user(&sigctx, sc, sizeof(sigctx)))
1522 * Note that PPC32 puts the upper 32 bits of the sigmask in the
1523 * unused part of the signal stackframe
1525 set.sig[0] = sigctx.oldmask + ((long)(sigctx._unused[3]) << 32);
1527 set.sig[0] = sigctx.oldmask;
1528 set.sig[1] = sigctx._unused[3];
1530 set_current_blocked(&set);
1532 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1533 mcp = (struct mcontext __user *)&sf->mctx;
1534 tm_mcp = (struct mcontext __user *)&sf->mctx_transact;
1535 if (__get_user(msr_hi, &tm_mcp->mc_gregs[PT_MSR]))
1537 if (MSR_TM_ACTIVE(msr_hi<<32)) {
1538 if (!cpu_has_feature(CPU_FTR_TM))
1540 if (restore_tm_user_regs(regs, mcp, tm_mcp))
1545 sr = (struct mcontext __user *)from_user_ptr(sigctx.regs);
1547 if (!access_ok(VERIFY_READ, sr, sizeof(*sr))
1548 || restore_user_regs(regs, sr, 1))
1552 set_thread_flag(TIF_RESTOREALL);
1556 if (show_unhandled_signals)
1557 printk_ratelimited(KERN_INFO
1558 "%s[%d]: bad frame in sys_sigreturn: "
1559 "%p nip %08lx lr %08lx\n",
1560 current->comm, current->pid,
1561 addr, regs->nip, regs->link);
1563 force_sig(SIGSEGV, current);