1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Signal handling for 32bit PPC and 32bit tasks on 64bit PPC
6 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
7 * Copyright (C) 2001 IBM
8 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
9 * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
11 * Derived from "arch/i386/kernel/signal.c"
12 * Copyright (C) 1991, 1992 Linus Torvalds
13 * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson
16 #include <linux/sched.h>
18 #include <linux/smp.h>
19 #include <linux/kernel.h>
20 #include <linux/signal.h>
21 #include <linux/errno.h>
22 #include <linux/elf.h>
23 #include <linux/ptrace.h>
24 #include <linux/pagemap.h>
25 #include <linux/ratelimit.h>
26 #include <linux/syscalls.h>
28 #include <linux/compat.h>
30 #include <linux/wait.h>
31 #include <linux/unistd.h>
32 #include <linux/stddef.h>
33 #include <linux/tty.h>
34 #include <linux/binfmts.h>
37 #include <linux/uaccess.h>
38 #include <asm/cacheflush.h>
39 #include <asm/syscalls.h>
40 #include <asm/sigcontext.h>
42 #include <asm/switch_to.h>
44 #include <asm/asm-prototypes.h>
46 #include <asm/syscalls_32.h>
47 #include <asm/unistd.h>
49 #include <asm/ucontext.h>
56 #define old_sigaction old_sigaction32
57 #define sigcontext sigcontext32
58 #define mcontext mcontext32
59 #define ucontext ucontext32
62 * Userspace code may pass a ucontext which doesn't include VSX added
63 * at the end. We need to check for this case.
65 #define UCONTEXTSIZEWITHOUTVSX \
66 (sizeof(struct ucontext) - sizeof(elf_vsrreghalf_t32))
69 * Returning 0 means we return to userspace via
70 * ret_from_except and thus restore all user
71 * registers from *regs. This is what we need
72 * to do when a signal has been delivered.
75 #define GP_REGS_SIZE min(sizeof(elf_gregset_t32), sizeof(struct pt_regs32))
76 #undef __SIGNAL_FRAMESIZE
77 #define __SIGNAL_FRAMESIZE __SIGNAL_FRAMESIZE32
79 #define ELF_NVRREG ELF_NVRREG32
82 * Functions for flipping sigsets (thanks to brain dead generic
83 * implementation that makes things simple for little endian only)
85 #define unsafe_put_sigset_t unsafe_put_compat_sigset
86 #define unsafe_get_sigset_t unsafe_get_compat_sigset
88 #define to_user_ptr(p) ptr_to_compat(p)
89 #define from_user_ptr(p) compat_ptr(p)
91 static __always_inline int
92 __unsafe_save_general_regs(struct pt_regs *regs, struct mcontext __user *frame)
94 elf_greg_t64 *gregs = (elf_greg_t64 *)regs;
97 for (i = 0; i <= PT_RESULT; i ++) {
98 /* Force usr to alway see softe as 1 (interrupts enabled) */
104 unsafe_put_user(val, &frame->mc_gregs[i], failed);
112 static __always_inline int
113 __unsafe_restore_general_regs(struct pt_regs *regs, struct mcontext __user *sr)
115 elf_greg_t64 *gregs = (elf_greg_t64 *)regs;
118 for (i = 0; i <= PT_RESULT; i++) {
119 if ((i == PT_MSR) || (i == PT_SOFTE))
121 unsafe_get_user(gregs[i], &sr->mc_gregs[i], failed);
129 #else /* CONFIG_PPC64 */
131 #define GP_REGS_SIZE min(sizeof(elf_gregset_t), sizeof(struct pt_regs))
133 #define unsafe_put_sigset_t(uset, set, label) do { \
134 sigset_t __user *__us = uset ; \
135 const sigset_t *__s = set; \
137 unsafe_copy_to_user(__us, __s, sizeof(*__us), label); \
140 #define unsafe_get_sigset_t unsafe_get_user_sigset
142 #define to_user_ptr(p) ((unsigned long)(p))
143 #define from_user_ptr(p) ((void __user *)(p))
145 static __always_inline int
146 __unsafe_save_general_regs(struct pt_regs *regs, struct mcontext __user *frame)
148 unsafe_copy_to_user(&frame->mc_gregs, regs, GP_REGS_SIZE, failed);
155 static __always_inline
156 int __unsafe_restore_general_regs(struct pt_regs *regs, struct mcontext __user *sr)
158 /* copy up to but not including MSR */
159 unsafe_copy_from_user(regs, &sr->mc_gregs, PT_MSR * sizeof(elf_greg_t), failed);
161 /* copy from orig_r3 (the word after the MSR) up to the end */
162 unsafe_copy_from_user(®s->orig_gpr3, &sr->mc_gregs[PT_ORIG_R3],
163 GP_REGS_SIZE - PT_ORIG_R3 * sizeof(elf_greg_t), failed);
172 #define unsafe_save_general_regs(regs, frame, label) do { \
173 if (__unsafe_save_general_regs(regs, frame)) \
177 #define unsafe_restore_general_regs(regs, frame, label) do { \
178 if (__unsafe_restore_general_regs(regs, frame)) \
183 * When we have signals to deliver, we set up on the
184 * user stack, going down from the original stack pointer:
185 * an ABI gap of 56 words
187 * a sigcontext struct
188 * a gap of __SIGNAL_FRAMESIZE bytes
190 * Each of these things must be a multiple of 16 bytes in size. The following
191 * structure represent all of this except the __SIGNAL_FRAMESIZE gap
195 struct sigcontext sctx; /* the sigcontext */
196 struct mcontext mctx; /* all the register values */
197 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
198 struct sigcontext sctx_transact;
199 struct mcontext mctx_transact;
202 * Programs using the rs6000/xcoff abi can save up to 19 gp
203 * regs and 18 fp regs below sp before decrementing it.
209 * When we have rt signals to deliver, we set up on the
210 * user stack, going down from the original stack pointer:
211 * one rt_sigframe struct (siginfo + ucontext + ABI gap)
212 * a gap of __SIGNAL_FRAMESIZE+16 bytes
213 * (the +16 is to get the siginfo and ucontext in the same
214 * positions as in older kernels).
216 * Each of these things must be a multiple of 16 bytes in size.
221 compat_siginfo_t info;
226 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
227 struct ucontext uc_transact;
230 * Programs using the rs6000/xcoff abi can save up to 19 gp
231 * regs and 18 fp regs below sp before decrementing it.
236 unsigned long get_min_sigframe_size_32(void)
238 return max(sizeof(struct rt_sigframe) + __SIGNAL_FRAMESIZE + 16,
239 sizeof(struct sigframe) + __SIGNAL_FRAMESIZE);
243 * Save the current user registers on the user stack.
244 * We only save the altivec/spe registers if the process has used
245 * altivec/spe instructions at some point.
247 static void prepare_save_user_regs(int ctx_has_vsx_region)
249 /* Make sure floating point registers are stored in regs */
250 flush_fp_to_thread(current);
251 #ifdef CONFIG_ALTIVEC
252 if (current->thread.used_vr)
253 flush_altivec_to_thread(current);
254 if (cpu_has_feature(CPU_FTR_ALTIVEC))
255 current->thread.vrsave = mfspr(SPRN_VRSAVE);
258 if (current->thread.used_vsr && ctx_has_vsx_region)
259 flush_vsx_to_thread(current);
262 if (current->thread.used_spe)
263 flush_spe_to_thread(current);
267 static int __unsafe_save_user_regs(struct pt_regs *regs, struct mcontext __user *frame,
268 struct mcontext __user *tm_frame, int ctx_has_vsx_region)
270 unsigned long msr = regs->msr;
272 /* save general registers */
273 unsafe_save_general_regs(regs, frame, failed);
275 #ifdef CONFIG_ALTIVEC
276 /* save altivec registers */
277 if (current->thread.used_vr) {
278 unsafe_copy_to_user(&frame->mc_vregs, ¤t->thread.vr_state,
279 ELF_NVRREG * sizeof(vector128), failed);
280 /* set MSR_VEC in the saved MSR value to indicate that
281 frame->mc_vregs contains valid data */
284 /* else assert((regs->msr & MSR_VEC) == 0) */
286 /* We always copy to/from vrsave, it's 0 if we don't have or don't
287 * use altivec. Since VSCR only contains 32 bits saved in the least
288 * significant bits of a vector, we "cheat" and stuff VRSAVE in the
289 * most significant bits of that same vector. --BenH
290 * Note that the current VRSAVE value is in the SPR at this point.
292 unsafe_put_user(current->thread.vrsave, (u32 __user *)&frame->mc_vregs[32],
294 #endif /* CONFIG_ALTIVEC */
295 unsafe_copy_fpr_to_user(&frame->mc_fregs, current, failed);
298 * Clear the MSR VSX bit to indicate there is no valid state attached
299 * to this context, except in the specific case below where we set it.
304 * Copy VSR 0-31 upper half from thread_struct to local
305 * buffer, then write that to userspace. Also set MSR_VSX in
306 * the saved MSR value to indicate that frame->mc_vregs
307 * contains valid data
309 if (current->thread.used_vsr && ctx_has_vsx_region) {
310 unsafe_copy_vsx_to_user(&frame->mc_vsregs, current, failed);
313 #endif /* CONFIG_VSX */
315 /* save spe registers */
316 if (current->thread.used_spe) {
317 unsafe_copy_to_user(&frame->mc_vregs, current->thread.evr,
318 ELF_NEVRREG * sizeof(u32), failed);
319 /* set MSR_SPE in the saved MSR value to indicate that
320 frame->mc_vregs contains valid data */
323 /* else assert((regs->msr & MSR_SPE) == 0) */
325 /* We always copy to/from spefscr */
326 unsafe_put_user(current->thread.spefscr,
327 (u32 __user *)&frame->mc_vregs + ELF_NEVRREG, failed);
328 #endif /* CONFIG_SPE */
330 unsafe_put_user(msr, &frame->mc_gregs[PT_MSR], failed);
332 /* We need to write 0 the MSR top 32 bits in the tm frame so that we
333 * can check it on the restore to see if TM is active
336 unsafe_put_user(0, &tm_frame->mc_gregs[PT_MSR], failed);
344 #define unsafe_save_user_regs(regs, frame, tm_frame, has_vsx, label) do { \
345 if (__unsafe_save_user_regs(regs, frame, tm_frame, has_vsx)) \
349 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
351 * Save the current user registers on the user stack.
352 * We only save the altivec/spe registers if the process has used
353 * altivec/spe instructions at some point.
354 * We also save the transactional registers to a second ucontext in the
357 * See __unsafe_save_user_regs() and signal_64.c:setup_tm_sigcontexts().
359 static void prepare_save_tm_user_regs(void)
361 WARN_ON(tm_suspend_disabled);
363 if (cpu_has_feature(CPU_FTR_ALTIVEC))
364 current->thread.ckvrsave = mfspr(SPRN_VRSAVE);
367 static int save_tm_user_regs_unsafe(struct pt_regs *regs, struct mcontext __user *frame,
368 struct mcontext __user *tm_frame, unsigned long msr)
370 /* Save both sets of general registers */
371 unsafe_save_general_regs(¤t->thread.ckpt_regs, frame, failed);
372 unsafe_save_general_regs(regs, tm_frame, failed);
374 /* Stash the top half of the 64bit MSR into the 32bit MSR word
375 * of the transactional mcontext. This way we have a backward-compatible
376 * MSR in the 'normal' (checkpointed) mcontext and additionally one can
377 * also look at what type of transaction (T or S) was active at the
378 * time of the signal.
380 unsafe_put_user((msr >> 32), &tm_frame->mc_gregs[PT_MSR], failed);
382 /* save altivec registers */
383 if (current->thread.used_vr) {
384 unsafe_copy_to_user(&frame->mc_vregs, ¤t->thread.ckvr_state,
385 ELF_NVRREG * sizeof(vector128), failed);
387 unsafe_copy_to_user(&tm_frame->mc_vregs,
388 ¤t->thread.vr_state,
389 ELF_NVRREG * sizeof(vector128), failed);
391 unsafe_copy_to_user(&tm_frame->mc_vregs,
392 ¤t->thread.ckvr_state,
393 ELF_NVRREG * sizeof(vector128), failed);
395 /* set MSR_VEC in the saved MSR value to indicate that
396 * frame->mc_vregs contains valid data
401 /* We always copy to/from vrsave, it's 0 if we don't have or don't
402 * use altivec. Since VSCR only contains 32 bits saved in the least
403 * significant bits of a vector, we "cheat" and stuff VRSAVE in the
404 * most significant bits of that same vector. --BenH
406 unsafe_put_user(current->thread.ckvrsave,
407 (u32 __user *)&frame->mc_vregs[32], failed);
409 unsafe_put_user(current->thread.vrsave,
410 (u32 __user *)&tm_frame->mc_vregs[32], failed);
412 unsafe_put_user(current->thread.ckvrsave,
413 (u32 __user *)&tm_frame->mc_vregs[32], failed);
415 unsafe_copy_ckfpr_to_user(&frame->mc_fregs, current, failed);
417 unsafe_copy_fpr_to_user(&tm_frame->mc_fregs, current, failed);
419 unsafe_copy_ckfpr_to_user(&tm_frame->mc_fregs, current, failed);
422 * Copy VSR 0-31 upper half from thread_struct to local
423 * buffer, then write that to userspace. Also set MSR_VSX in
424 * the saved MSR value to indicate that frame->mc_vregs
425 * contains valid data
427 if (current->thread.used_vsr) {
428 unsafe_copy_ckvsx_to_user(&frame->mc_vsregs, current, failed);
430 unsafe_copy_vsx_to_user(&tm_frame->mc_vsregs, current, failed);
432 unsafe_copy_ckvsx_to_user(&tm_frame->mc_vsregs, current, failed);
437 unsafe_put_user(msr, &frame->mc_gregs[PT_MSR], failed);
445 static void prepare_save_tm_user_regs(void) { }
447 static int save_tm_user_regs_unsafe(struct pt_regs *regs, struct mcontext __user *frame,
448 struct mcontext __user *tm_frame, unsigned long msr)
454 #define unsafe_save_tm_user_regs(regs, frame, tm_frame, msr, label) do { \
455 if (save_tm_user_regs_unsafe(regs, frame, tm_frame, msr)) \
460 * Restore the current user register values from the user stack,
463 static long restore_user_regs(struct pt_regs *regs,
464 struct mcontext __user *sr, int sig)
466 unsigned int save_r2 = 0;
472 if (!user_read_access_begin(sr, sizeof(*sr)))
475 * restore general registers but not including MSR or SOFTE. Also
476 * take care of keeping r2 (TLS) intact if not a signal
479 save_r2 = (unsigned int)regs->gpr[2];
480 unsafe_restore_general_regs(regs, sr, failed);
481 set_trap_norestart(regs);
482 unsafe_get_user(msr, &sr->mc_gregs[PT_MSR], failed);
484 regs->gpr[2] = (unsigned long) save_r2;
486 /* if doing signal return, restore the previous little-endian mode */
488 regs_set_return_msr(regs, (regs->msr & ~MSR_LE) | (msr & MSR_LE));
490 #ifdef CONFIG_ALTIVEC
492 * Force the process to reload the altivec registers from
493 * current->thread when it next does altivec instructions
495 regs_set_return_msr(regs, regs->msr & ~MSR_VEC);
497 /* restore altivec registers from the stack */
498 unsafe_copy_from_user(¤t->thread.vr_state, &sr->mc_vregs,
499 sizeof(sr->mc_vregs), failed);
500 current->thread.used_vr = true;
501 } else if (current->thread.used_vr)
502 memset(¤t->thread.vr_state, 0,
503 ELF_NVRREG * sizeof(vector128));
505 /* Always get VRSAVE back */
506 unsafe_get_user(current->thread.vrsave, (u32 __user *)&sr->mc_vregs[32], failed);
507 if (cpu_has_feature(CPU_FTR_ALTIVEC))
508 mtspr(SPRN_VRSAVE, current->thread.vrsave);
509 #endif /* CONFIG_ALTIVEC */
510 unsafe_copy_fpr_from_user(current, &sr->mc_fregs, failed);
514 * Force the process to reload the VSX registers from
515 * current->thread when it next does VSX instruction.
517 regs_set_return_msr(regs, regs->msr & ~MSR_VSX);
520 * Restore altivec registers from the stack to a local
521 * buffer, then write this out to the thread_struct
523 unsafe_copy_vsx_from_user(current, &sr->mc_vsregs, failed);
524 current->thread.used_vsr = true;
525 } else if (current->thread.used_vsr)
526 for (i = 0; i < 32 ; i++)
527 current->thread.fp_state.fpr[i][TS_VSRLOWOFFSET] = 0;
528 #endif /* CONFIG_VSX */
530 * force the process to reload the FP registers from
531 * current->thread when it next does FP instructions
533 regs_set_return_msr(regs, regs->msr & ~(MSR_FP | MSR_FE0 | MSR_FE1));
537 * Force the process to reload the spe registers from
538 * current->thread when it next does spe instructions.
539 * Since this is user ABI, we must enforce the sizing.
541 BUILD_BUG_ON(sizeof(current->thread.spe) != ELF_NEVRREG * sizeof(u32));
542 regs_set_return_msr(regs, regs->msr & ~MSR_SPE);
544 /* restore spe registers from the stack */
545 unsafe_copy_from_user(¤t->thread.spe, &sr->mc_vregs,
546 sizeof(current->thread.spe), failed);
547 current->thread.used_spe = true;
548 } else if (current->thread.used_spe)
549 memset(¤t->thread.spe, 0, sizeof(current->thread.spe));
551 /* Always get SPEFSCR back */
552 unsafe_get_user(current->thread.spefscr, (u32 __user *)&sr->mc_vregs + ELF_NEVRREG, failed);
553 #endif /* CONFIG_SPE */
555 user_read_access_end();
559 user_read_access_end();
563 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
565 * Restore the current user register values from the user stack, except for
566 * MSR, and recheckpoint the original checkpointed register state for processes
569 static long restore_tm_user_regs(struct pt_regs *regs,
570 struct mcontext __user *sr,
571 struct mcontext __user *tm_sr)
573 unsigned long msr, msr_hi;
576 if (tm_suspend_disabled)
579 * restore general registers but not including MSR or SOFTE. Also
580 * take care of keeping r2 (TLS) intact if not a signal.
581 * See comment in signal_64.c:restore_tm_sigcontexts();
582 * TFHAR is restored from the checkpointed NIP; TEXASR and TFIAR
583 * were set by the signal delivery.
585 if (!user_read_access_begin(sr, sizeof(*sr)))
588 unsafe_restore_general_regs(¤t->thread.ckpt_regs, sr, failed);
589 unsafe_get_user(current->thread.tm_tfhar, &sr->mc_gregs[PT_NIP], failed);
590 unsafe_get_user(msr, &sr->mc_gregs[PT_MSR], failed);
592 /* Restore the previous little-endian mode */
593 regs_set_return_msr(regs, (regs->msr & ~MSR_LE) | (msr & MSR_LE));
595 regs_set_return_msr(regs, regs->msr & ~MSR_VEC);
597 /* restore altivec registers from the stack */
598 unsafe_copy_from_user(¤t->thread.ckvr_state, &sr->mc_vregs,
599 sizeof(sr->mc_vregs), failed);
600 current->thread.used_vr = true;
601 } else if (current->thread.used_vr) {
602 memset(¤t->thread.vr_state, 0,
603 ELF_NVRREG * sizeof(vector128));
604 memset(¤t->thread.ckvr_state, 0,
605 ELF_NVRREG * sizeof(vector128));
608 /* Always get VRSAVE back */
609 unsafe_get_user(current->thread.ckvrsave,
610 (u32 __user *)&sr->mc_vregs[32], failed);
611 if (cpu_has_feature(CPU_FTR_ALTIVEC))
612 mtspr(SPRN_VRSAVE, current->thread.ckvrsave);
614 regs_set_return_msr(regs, regs->msr & ~(MSR_FP | MSR_FE0 | MSR_FE1));
616 unsafe_copy_fpr_from_user(current, &sr->mc_fregs, failed);
618 regs_set_return_msr(regs, regs->msr & ~MSR_VSX);
621 * Restore altivec registers from the stack to a local
622 * buffer, then write this out to the thread_struct
624 unsafe_copy_ckvsx_from_user(current, &sr->mc_vsregs, failed);
625 current->thread.used_vsr = true;
626 } else if (current->thread.used_vsr)
627 for (i = 0; i < 32 ; i++) {
628 current->thread.fp_state.fpr[i][TS_VSRLOWOFFSET] = 0;
629 current->thread.ckfp_state.fpr[i][TS_VSRLOWOFFSET] = 0;
632 user_read_access_end();
634 if (!user_read_access_begin(tm_sr, sizeof(*tm_sr)))
637 unsafe_restore_general_regs(regs, tm_sr, failed);
639 /* restore altivec registers from the stack */
641 unsafe_copy_from_user(¤t->thread.vr_state, &tm_sr->mc_vregs,
642 sizeof(sr->mc_vregs), failed);
644 /* Always get VRSAVE back */
645 unsafe_get_user(current->thread.vrsave,
646 (u32 __user *)&tm_sr->mc_vregs[32], failed);
648 unsafe_copy_ckfpr_from_user(current, &tm_sr->mc_fregs, failed);
652 * Restore altivec registers from the stack to a local
653 * buffer, then write this out to the thread_struct
655 unsafe_copy_vsx_from_user(current, &tm_sr->mc_vsregs, failed);
656 current->thread.used_vsr = true;
659 /* Get the top half of the MSR from the user context */
660 unsafe_get_user(msr_hi, &tm_sr->mc_gregs[PT_MSR], failed);
663 user_read_access_end();
665 /* If TM bits are set to the reserved value, it's an invalid context */
666 if (MSR_TM_RESV(msr_hi))
670 * Disabling preemption, since it is unsafe to be preempted
671 * with MSR[TS] set without recheckpointing.
677 * After regs->MSR[TS] being updated, make sure that get_user(),
678 * put_user() or similar functions are *not* called. These
679 * functions can generate page faults which will cause the process
680 * to be de-scheduled with MSR[TS] set but without calling
681 * tm_recheckpoint(). This can cause a bug.
683 * Pull in the MSR TM bits from the user context
685 regs_set_return_msr(regs, (regs->msr & ~MSR_TS_MASK) | (msr_hi & MSR_TS_MASK));
686 /* Now, recheckpoint. This loads up all of the checkpointed (older)
687 * registers, including FP and V[S]Rs. After recheckpointing, the
688 * transactional versions should be loaded.
691 /* Make sure the transaction is marked as failed */
692 current->thread.tm_texasr |= TEXASR_FS;
693 /* This loads the checkpointed FP/VEC state, if used */
694 tm_recheckpoint(¤t->thread);
696 /* This loads the speculative FP/VEC state, if used */
697 msr_check_and_set(msr & (MSR_FP | MSR_VEC));
699 load_fp_state(¤t->thread.fp_state);
700 regs_set_return_msr(regs, regs->msr | (MSR_FP | current->thread.fpexc_mode));
703 load_vr_state(¤t->thread.vr_state);
704 regs_set_return_msr(regs, regs->msr | MSR_VEC);
712 user_read_access_end();
716 static long restore_tm_user_regs(struct pt_regs *regs, struct mcontext __user *sr,
717 struct mcontext __user *tm_sr)
725 #define copy_siginfo_to_user copy_siginfo_to_user32
727 #endif /* CONFIG_PPC64 */
730 * Set up a signal frame for a "real-time" signal handler
731 * (one which gets siginfo).
733 int handle_rt_signal32(struct ksignal *ksig, sigset_t *oldset,
734 struct task_struct *tsk)
736 struct rt_sigframe __user *frame;
737 struct mcontext __user *mctx;
738 struct mcontext __user *tm_mctx = NULL;
739 unsigned long newsp = 0;
741 struct pt_regs *regs = tsk->thread.regs;
742 /* Save the thread's msr before get_tm_stackpointer() changes it */
743 unsigned long msr = regs->msr;
745 /* Set up Signal Frame */
746 frame = get_sigframe(ksig, tsk, sizeof(*frame), 1);
747 mctx = &frame->uc.uc_mcontext;
748 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
749 tm_mctx = &frame->uc_transact.uc_mcontext;
751 if (MSR_TM_ACTIVE(msr))
752 prepare_save_tm_user_regs();
754 prepare_save_user_regs(1);
756 if (!user_access_begin(frame, sizeof(*frame)))
759 /* Put the siginfo & fill in most of the ucontext */
760 unsafe_put_user(0, &frame->uc.uc_flags, failed);
762 unsafe_compat_save_altstack(&frame->uc.uc_stack, regs->gpr[1], failed);
764 unsafe_save_altstack(&frame->uc.uc_stack, regs->gpr[1], failed);
766 unsafe_put_user(to_user_ptr(&frame->uc.uc_mcontext), &frame->uc.uc_regs, failed);
768 if (MSR_TM_ACTIVE(msr)) {
769 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
770 unsafe_put_user((unsigned long)&frame->uc_transact,
771 &frame->uc.uc_link, failed);
772 unsafe_put_user((unsigned long)tm_mctx,
773 &frame->uc_transact.uc_regs, failed);
775 unsafe_save_tm_user_regs(regs, mctx, tm_mctx, msr, failed);
777 unsafe_put_user(0, &frame->uc.uc_link, failed);
778 unsafe_save_user_regs(regs, mctx, tm_mctx, 1, failed);
781 /* Save user registers on the stack */
782 if (tsk->mm->context.vdso) {
783 tramp = VDSO32_SYMBOL(tsk->mm->context.vdso, sigtramp_rt32);
785 tramp = (unsigned long)mctx->mc_pad;
786 unsafe_put_user(PPC_RAW_LI(_R0, __NR_rt_sigreturn), &mctx->mc_pad[0], failed);
787 unsafe_put_user(PPC_RAW_SC(), &mctx->mc_pad[1], failed);
788 asm("dcbst %y0; sync; icbi %y0; sync" :: "Z" (mctx->mc_pad[0]));
790 unsafe_put_sigset_t(&frame->uc.uc_sigmask, oldset, failed);
794 if (copy_siginfo_to_user(&frame->info, &ksig->info))
799 #ifdef CONFIG_PPC_FPU_REGS
800 tsk->thread.fp_state.fpscr = 0; /* turn off all fp exceptions */
803 /* create a stack frame for the caller of the handler */
804 newsp = ((unsigned long)frame) - (__SIGNAL_FRAMESIZE + 16);
805 if (put_user(regs->gpr[1], (u32 __user *)newsp))
808 /* Fill registers for signal handler */
809 regs->gpr[1] = newsp;
810 regs->gpr[3] = ksig->sig;
811 regs->gpr[4] = (unsigned long)&frame->info;
812 regs->gpr[5] = (unsigned long)&frame->uc;
813 regs->gpr[6] = (unsigned long)frame;
814 regs_set_return_ip(regs, (unsigned long) ksig->ka.sa.sa_handler);
815 /* enter the signal handler in native-endian mode */
816 regs_set_return_msr(regs, (regs->msr & ~MSR_LE) | (MSR_KERNEL & MSR_LE));
824 signal_fault(tsk, regs, "handle_rt_signal32", frame);
830 * OK, we're invoking a handler
832 int handle_signal32(struct ksignal *ksig, sigset_t *oldset,
833 struct task_struct *tsk)
835 struct sigcontext __user *sc;
836 struct sigframe __user *frame;
837 struct mcontext __user *mctx;
838 struct mcontext __user *tm_mctx = NULL;
839 unsigned long newsp = 0;
841 struct pt_regs *regs = tsk->thread.regs;
842 /* Save the thread's msr before get_tm_stackpointer() changes it */
843 unsigned long msr = regs->msr;
845 /* Set up Signal Frame */
846 frame = get_sigframe(ksig, tsk, sizeof(*frame), 1);
848 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
849 tm_mctx = &frame->mctx_transact;
851 if (MSR_TM_ACTIVE(msr))
852 prepare_save_tm_user_regs();
854 prepare_save_user_regs(1);
856 if (!user_access_begin(frame, sizeof(*frame)))
858 sc = (struct sigcontext __user *) &frame->sctx;
861 #error "Please adjust handle_signal()"
863 unsafe_put_user(to_user_ptr(ksig->ka.sa.sa_handler), &sc->handler, failed);
864 unsafe_put_user(oldset->sig[0], &sc->oldmask, failed);
866 unsafe_put_user((oldset->sig[0] >> 32), &sc->_unused[3], failed);
868 unsafe_put_user(oldset->sig[1], &sc->_unused[3], failed);
870 unsafe_put_user(to_user_ptr(mctx), &sc->regs, failed);
871 unsafe_put_user(ksig->sig, &sc->signal, failed);
873 if (MSR_TM_ACTIVE(msr))
874 unsafe_save_tm_user_regs(regs, mctx, tm_mctx, msr, failed);
876 unsafe_save_user_regs(regs, mctx, tm_mctx, 1, failed);
878 if (tsk->mm->context.vdso) {
879 tramp = VDSO32_SYMBOL(tsk->mm->context.vdso, sigtramp32);
881 tramp = (unsigned long)mctx->mc_pad;
882 unsafe_put_user(PPC_RAW_LI(_R0, __NR_sigreturn), &mctx->mc_pad[0], failed);
883 unsafe_put_user(PPC_RAW_SC(), &mctx->mc_pad[1], failed);
884 asm("dcbst %y0; sync; icbi %y0; sync" :: "Z" (mctx->mc_pad[0]));
890 #ifdef CONFIG_PPC_FPU_REGS
891 tsk->thread.fp_state.fpscr = 0; /* turn off all fp exceptions */
894 /* create a stack frame for the caller of the handler */
895 newsp = ((unsigned long)frame) - __SIGNAL_FRAMESIZE;
896 if (put_user(regs->gpr[1], (u32 __user *)newsp))
899 regs->gpr[1] = newsp;
900 regs->gpr[3] = ksig->sig;
901 regs->gpr[4] = (unsigned long) sc;
902 regs_set_return_ip(regs, (unsigned long) ksig->ka.sa.sa_handler);
903 /* enter the signal handler in native-endian mode */
904 regs_set_return_msr(regs, (regs->msr & ~MSR_LE) | (MSR_KERNEL & MSR_LE));
912 signal_fault(tsk, regs, "handle_signal32", frame);
917 static int do_setcontext(struct ucontext __user *ucp, struct pt_regs *regs, int sig)
920 struct mcontext __user *mcp;
922 if (!user_read_access_begin(ucp, sizeof(*ucp)))
925 unsafe_get_sigset_t(&set, &ucp->uc_sigmask, failed);
930 unsafe_get_user(cmcp, &ucp->uc_regs, failed);
931 mcp = (struct mcontext __user *)(u64)cmcp;
934 unsafe_get_user(mcp, &ucp->uc_regs, failed);
936 user_read_access_end();
938 set_current_blocked(&set);
939 if (restore_user_regs(regs, mcp, sig))
945 user_read_access_end();
949 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
950 static int do_setcontext_tm(struct ucontext __user *ucp,
951 struct ucontext __user *tm_ucp,
952 struct pt_regs *regs)
955 struct mcontext __user *mcp;
956 struct mcontext __user *tm_mcp;
960 if (!user_read_access_begin(ucp, sizeof(*ucp)))
963 unsafe_get_sigset_t(&set, &ucp->uc_sigmask, failed);
964 unsafe_get_user(cmcp, &ucp->uc_regs, failed);
966 user_read_access_end();
968 if (__get_user(tm_cmcp, &tm_ucp->uc_regs))
970 mcp = (struct mcontext __user *)(u64)cmcp;
971 tm_mcp = (struct mcontext __user *)(u64)tm_cmcp;
972 /* no need to check access_ok(mcp), since mcp < 4GB */
974 set_current_blocked(&set);
975 if (restore_tm_user_regs(regs, mcp, tm_mcp))
981 user_read_access_end();
987 COMPAT_SYSCALL_DEFINE3(swapcontext, struct ucontext __user *, old_ctx,
988 struct ucontext __user *, new_ctx, int, ctx_size)
990 SYSCALL_DEFINE3(swapcontext, struct ucontext __user *, old_ctx,
991 struct ucontext __user *, new_ctx, long, ctx_size)
994 struct pt_regs *regs = current_pt_regs();
995 int ctx_has_vsx_region = 0;
998 unsigned long new_msr = 0;
1001 struct mcontext __user *mcp;
1005 * Get pointer to the real mcontext. No need for
1006 * access_ok since we are dealing with compat
1009 if (__get_user(cmcp, &new_ctx->uc_regs))
1011 mcp = (struct mcontext __user *)(u64)cmcp;
1012 if (__get_user(new_msr, &mcp->mc_gregs[PT_MSR]))
1016 * Check that the context is not smaller than the original
1017 * size (with VMX but without VSX)
1019 if (ctx_size < UCONTEXTSIZEWITHOUTVSX)
1022 * If the new context state sets the MSR VSX bits but
1023 * it doesn't provide VSX state.
1025 if ((ctx_size < sizeof(struct ucontext)) &&
1026 (new_msr & MSR_VSX))
1028 /* Does the context have enough room to store VSX data? */
1029 if (ctx_size >= sizeof(struct ucontext))
1030 ctx_has_vsx_region = 1;
1032 /* Context size is for future use. Right now, we only make sure
1033 * we are passed something we understand
1035 if (ctx_size < sizeof(struct ucontext))
1038 if (old_ctx != NULL) {
1039 struct mcontext __user *mctx;
1042 * old_ctx might not be 16-byte aligned, in which
1043 * case old_ctx->uc_mcontext won't be either.
1044 * Because we have the old_ctx->uc_pad2 field
1045 * before old_ctx->uc_mcontext, we need to round down
1046 * from &old_ctx->uc_mcontext to a 16-byte boundary.
1048 mctx = (struct mcontext __user *)
1049 ((unsigned long) &old_ctx->uc_mcontext & ~0xfUL);
1050 prepare_save_user_regs(ctx_has_vsx_region);
1051 if (!user_write_access_begin(old_ctx, ctx_size))
1053 unsafe_save_user_regs(regs, mctx, NULL, ctx_has_vsx_region, failed);
1054 unsafe_put_sigset_t(&old_ctx->uc_sigmask, ¤t->blocked, failed);
1055 unsafe_put_user(to_user_ptr(mctx), &old_ctx->uc_regs, failed);
1056 user_write_access_end();
1058 if (new_ctx == NULL)
1060 if (!access_ok(new_ctx, ctx_size) ||
1061 fault_in_readable((char __user *)new_ctx, ctx_size))
1065 * If we get a fault copying the context into the kernel's
1066 * image of the user's registers, we can't just return -EFAULT
1067 * because the user's registers will be corrupted. For instance
1068 * the NIP value may have been updated but not some of the
1069 * other registers. Given that we have done the access_ok
1070 * and successfully read the first and last bytes of the region
1071 * above, this should only happen in an out-of-memory situation
1072 * or if another thread unmaps the region containing the context.
1073 * We kill the task with a SIGSEGV in this situation.
1075 if (do_setcontext(new_ctx, regs, 0)) {
1076 force_exit_sig(SIGSEGV);
1080 set_thread_flag(TIF_RESTOREALL);
1084 user_write_access_end();
1089 COMPAT_SYSCALL_DEFINE0(rt_sigreturn)
1091 SYSCALL_DEFINE0(rt_sigreturn)
1094 struct rt_sigframe __user *rt_sf;
1095 struct pt_regs *regs = current_pt_regs();
1097 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1098 struct ucontext __user *uc_transact;
1099 unsigned long msr_hi;
1102 /* Always make any pending restarted system calls return -EINTR */
1103 current->restart_block.fn = do_no_restart_syscall;
1105 rt_sf = (struct rt_sigframe __user *)
1106 (regs->gpr[1] + __SIGNAL_FRAMESIZE + 16);
1107 if (!access_ok(rt_sf, sizeof(*rt_sf)))
1110 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1112 * If there is a transactional state then throw it away.
1113 * The purpose of a sigreturn is to destroy all traces of the
1114 * signal frame, this includes any transactional state created
1115 * within in. We only check for suspended as we can never be
1116 * active in the kernel, we are active, there is nothing better to
1117 * do than go ahead and Bad Thing later.
1118 * The cause is not important as there will never be a
1119 * recheckpoint so it's not user visible.
1121 if (MSR_TM_SUSPENDED(mfmsr()))
1122 tm_reclaim_current(0);
1124 if (__get_user(tmp, &rt_sf->uc.uc_link))
1126 uc_transact = (struct ucontext __user *)(uintptr_t)tmp;
1129 struct mcontext __user *mcp;
1131 if (__get_user(cmcp, &uc_transact->uc_regs))
1133 mcp = (struct mcontext __user *)(u64)cmcp;
1134 /* The top 32 bits of the MSR are stashed in the transactional
1136 if (__get_user(msr_hi, &mcp->mc_gregs[PT_MSR]))
1139 if (MSR_TM_ACTIVE(msr_hi<<32)) {
1140 /* Trying to start TM on non TM system */
1141 if (!cpu_has_feature(CPU_FTR_TM))
1143 /* We only recheckpoint on return if we're
1147 if (do_setcontext_tm(&rt_sf->uc, uc_transact, regs))
1153 * Unset regs->msr because ucontext MSR TS is not
1154 * set, and recheckpoint was not called. This avoid
1155 * hitting a TM Bad thing at RFID
1157 regs_set_return_msr(regs, regs->msr & ~MSR_TS_MASK);
1159 /* Fall through, for non-TM restore */
1162 if (do_setcontext(&rt_sf->uc, regs, 1))
1166 * It's not clear whether or why it is desirable to save the
1167 * sigaltstack setting on signal delivery and restore it on
1168 * signal return. But other architectures do this and we have
1169 * always done it up until now so it is probably better not to
1170 * change it. -- paulus
1173 if (compat_restore_altstack(&rt_sf->uc.uc_stack))
1176 if (restore_altstack(&rt_sf->uc.uc_stack))
1179 set_thread_flag(TIF_RESTOREALL);
1183 signal_fault(current, regs, "sys_rt_sigreturn", rt_sf);
1190 SYSCALL_DEFINE3(debug_setcontext, struct ucontext __user *, ctx,
1191 int, ndbg, struct sig_dbg_op __user *, dbg)
1193 struct pt_regs *regs = current_pt_regs();
1194 struct sig_dbg_op op;
1196 unsigned long new_msr = regs->msr;
1197 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
1198 unsigned long new_dbcr0 = current->thread.debug.dbcr0;
1201 for (i=0; i<ndbg; i++) {
1202 if (copy_from_user(&op, dbg + i, sizeof(op)))
1204 switch (op.dbg_type) {
1205 case SIG_DBG_SINGLE_STEPPING:
1206 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
1209 new_dbcr0 |= (DBCR0_IDM | DBCR0_IC);
1211 new_dbcr0 &= ~DBCR0_IC;
1212 if (!DBCR_ACTIVE_EVENTS(new_dbcr0,
1213 current->thread.debug.dbcr1)) {
1215 new_dbcr0 &= ~DBCR0_IDM;
1225 case SIG_DBG_BRANCH_TRACING:
1226 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
1241 /* We wait until here to actually install the values in the
1242 registers so if we fail in the above loop, it will not
1243 affect the contents of these registers. After this point,
1244 failure is a problem, anyway, and it's very unlikely unless
1245 the user is really doing something wrong. */
1246 regs_set_return_msr(regs, new_msr);
1247 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
1248 current->thread.debug.dbcr0 = new_dbcr0;
1251 if (!access_ok(ctx, sizeof(*ctx)) ||
1252 fault_in_readable((char __user *)ctx, sizeof(*ctx)))
1256 * If we get a fault copying the context into the kernel's
1257 * image of the user's registers, we can't just return -EFAULT
1258 * because the user's registers will be corrupted. For instance
1259 * the NIP value may have been updated but not some of the
1260 * other registers. Given that we have done the access_ok
1261 * and successfully read the first and last bytes of the region
1262 * above, this should only happen in an out-of-memory situation
1263 * or if another thread unmaps the region containing the context.
1264 * We kill the task with a SIGSEGV in this situation.
1266 if (do_setcontext(ctx, regs, 1)) {
1267 signal_fault(current, regs, "sys_debug_setcontext", ctx);
1274 * It's not clear whether or why it is desirable to save the
1275 * sigaltstack setting on signal delivery and restore it on
1276 * signal return. But other architectures do this and we have
1277 * always done it up until now so it is probably better not to
1278 * change it. -- paulus
1280 restore_altstack(&ctx->uc_stack);
1282 set_thread_flag(TIF_RESTOREALL);
1289 * Do a signal return; undo the signal stack.
1292 COMPAT_SYSCALL_DEFINE0(sigreturn)
1294 SYSCALL_DEFINE0(sigreturn)
1297 struct pt_regs *regs = current_pt_regs();
1298 struct sigframe __user *sf;
1299 struct sigcontext __user *sc;
1300 struct sigcontext sigctx;
1301 struct mcontext __user *sr;
1303 struct mcontext __user *mcp;
1304 struct mcontext __user *tm_mcp = NULL;
1305 unsigned long long msr_hi = 0;
1307 /* Always make any pending restarted system calls return -EINTR */
1308 current->restart_block.fn = do_no_restart_syscall;
1310 sf = (struct sigframe __user *)(regs->gpr[1] + __SIGNAL_FRAMESIZE);
1312 if (copy_from_user(&sigctx, sc, sizeof(sigctx)))
1317 * Note that PPC32 puts the upper 32 bits of the sigmask in the
1318 * unused part of the signal stackframe
1320 set.sig[0] = sigctx.oldmask + ((long)(sigctx._unused[3]) << 32);
1322 set.sig[0] = sigctx.oldmask;
1323 set.sig[1] = sigctx._unused[3];
1325 set_current_blocked(&set);
1327 mcp = (struct mcontext __user *)&sf->mctx;
1328 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1329 tm_mcp = (struct mcontext __user *)&sf->mctx_transact;
1330 if (__get_user(msr_hi, &tm_mcp->mc_gregs[PT_MSR]))
1333 if (MSR_TM_ACTIVE(msr_hi<<32)) {
1334 if (!cpu_has_feature(CPU_FTR_TM))
1336 if (restore_tm_user_regs(regs, mcp, tm_mcp))
1339 sr = (struct mcontext __user *)from_user_ptr(sigctx.regs);
1340 if (restore_user_regs(regs, sr, 1)) {
1341 signal_fault(current, regs, "sys_sigreturn", sr);
1348 set_thread_flag(TIF_RESTOREALL);
1352 signal_fault(current, regs, "sys_sigreturn", sc);