3 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
5 * Derived from "arch/i386/kernel/signal.c"
6 * Copyright (C) 1991, 1992 Linus Torvalds
7 * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
15 #include <linux/sched.h>
17 #include <linux/smp.h>
18 #include <linux/kernel.h>
19 #include <linux/signal.h>
20 #include <linux/errno.h>
21 #include <linux/wait.h>
22 #include <linux/unistd.h>
23 #include <linux/stddef.h>
24 #include <linux/elf.h>
25 #include <linux/ptrace.h>
26 #include <linux/ratelimit.h>
28 #include <asm/sigcontext.h>
29 #include <asm/ucontext.h>
30 #include <asm/uaccess.h>
31 #include <asm/pgtable.h>
32 #include <asm/unistd.h>
33 #include <asm/cacheflush.h>
34 #include <asm/syscalls.h>
36 #include <asm/switch_to.h>
42 #define GP_REGS_SIZE min(sizeof(elf_gregset_t), sizeof(struct pt_regs))
43 #define FP_REGS_SIZE sizeof(elf_fpregset_t)
45 #define TRAMP_TRACEBACK 3
49 * When we have signals to deliver, we set up on the user stack,
50 * going down from the original stack pointer:
51 * 1) a rt_sigframe struct which contains the ucontext
52 * 2) a gap of __SIGNAL_FRAMESIZE bytes which acts as a dummy caller
53 * frame for the signal handler.
57 /* sys_rt_sigreturn requires the ucontext be the first field */
59 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
60 struct ucontext uc_transact;
62 unsigned long _unused[2];
63 unsigned int tramp[TRAMP_SIZE];
64 struct siginfo __user *pinfo;
67 /* New 64 bit little-endian ABI allows redzone of 512 bytes below sp */
68 char abigap[USER_REDZONE_SIZE];
69 } __attribute__ ((aligned (16)));
71 static const char fmt32[] = KERN_INFO \
72 "%s[%d]: bad frame in %s: %08lx nip %08lx lr %08lx\n";
73 static const char fmt64[] = KERN_INFO \
74 "%s[%d]: bad frame in %s: %016lx nip %016lx lr %016lx\n";
77 * This computes a quad word aligned pointer inside the vmx_reserve array
78 * element. For historical reasons sigcontext might not be quad word aligned,
79 * but the location we write the VMX regs to must be. See the comment in
80 * sigcontext for more detail.
83 static elf_vrreg_t __user *sigcontext_vmx_regs(struct sigcontext __user *sc)
85 return (elf_vrreg_t __user *) (((unsigned long)sc->vmx_reserve + 15) & ~0xful);
90 * Set up the sigcontext for the signal frame.
93 static long setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
94 int signr, sigset_t *set, unsigned long handler,
95 int ctx_has_vsx_region)
97 /* When CONFIG_ALTIVEC is set, we _always_ setup v_regs even if the
98 * process never used altivec yet (MSR_VEC is zero in pt_regs of
99 * the context). This is very important because we must ensure we
100 * don't lose the VRSAVE content that may have been set prior to
101 * the process doing its first vector operation
102 * Userland shall check AT_HWCAP to know whether it can rely on the
103 * v_regs pointer or not
105 #ifdef CONFIG_ALTIVEC
106 elf_vrreg_t __user *v_regs = sigcontext_vmx_regs(sc);
108 unsigned long msr = regs->msr;
111 #ifdef CONFIG_ALTIVEC
112 err |= __put_user(v_regs, &sc->v_regs);
114 /* save altivec registers */
115 if (current->thread.used_vr) {
116 flush_altivec_to_thread(current);
117 /* Copy 33 vec registers (vr0..31 and vscr) to the stack */
118 err |= __copy_to_user(v_regs, ¤t->thread.vr_state,
119 33 * sizeof(vector128));
120 /* set MSR_VEC in the MSR value in the frame to indicate that sc->v_reg)
121 * contains valid data.
125 /* We always copy to/from vrsave, it's 0 if we don't have or don't
128 if (cpu_has_feature(CPU_FTR_ALTIVEC))
129 current->thread.vrsave = mfspr(SPRN_VRSAVE);
130 err |= __put_user(current->thread.vrsave, (u32 __user *)&v_regs[33]);
131 #else /* CONFIG_ALTIVEC */
132 err |= __put_user(0, &sc->v_regs);
133 #endif /* CONFIG_ALTIVEC */
134 flush_fp_to_thread(current);
135 /* copy fpr regs and fpscr */
136 err |= copy_fpr_to_user(&sc->fp_regs, current);
139 * Clear the MSR VSX bit to indicate there is no valid state attached
140 * to this context, except in the specific case below where we set it.
145 * Copy VSX low doubleword to local buffer for formatting,
146 * then out to userspace. Update v_regs to point after the
149 if (current->thread.used_vsr && ctx_has_vsx_region) {
150 __giveup_vsx(current);
151 v_regs += ELF_NVRREG;
152 err |= copy_vsx_to_user(v_regs, current);
153 /* set MSR_VSX in the MSR value in the frame to
154 * indicate that sc->vs_reg) contains valid data.
158 #endif /* CONFIG_VSX */
159 err |= __put_user(&sc->gp_regs, &sc->regs);
160 WARN_ON(!FULL_REGS(regs));
161 err |= __copy_to_user(&sc->gp_regs, regs, GP_REGS_SIZE);
162 err |= __put_user(msr, &sc->gp_regs[PT_MSR]);
163 err |= __put_user(signr, &sc->signal);
164 err |= __put_user(handler, &sc->handler);
166 err |= __put_user(set->sig[0], &sc->oldmask);
171 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
173 * As above, but Transactional Memory is in use, so deliver sigcontexts
174 * containing checkpointed and transactional register states.
176 * To do this, we treclaim (done before entering here) to gather both sets of
177 * registers and set up the 'normal' sigcontext registers with rolled-back
178 * register values such that a simple signal handler sees a correct
179 * checkpointed register state. If interested, a TM-aware sighandler can
180 * examine the transactional registers in the 2nd sigcontext to determine the
181 * real origin of the signal.
183 static long setup_tm_sigcontexts(struct sigcontext __user *sc,
184 struct sigcontext __user *tm_sc,
185 struct pt_regs *regs,
186 int signr, sigset_t *set, unsigned long handler)
188 /* When CONFIG_ALTIVEC is set, we _always_ setup v_regs even if the
189 * process never used altivec yet (MSR_VEC is zero in pt_regs of
190 * the context). This is very important because we must ensure we
191 * don't lose the VRSAVE content that may have been set prior to
192 * the process doing its first vector operation
193 * Userland shall check AT_HWCAP to know wether it can rely on the
194 * v_regs pointer or not.
196 #ifdef CONFIG_ALTIVEC
197 elf_vrreg_t __user *v_regs = sigcontext_vmx_regs(sc);
198 elf_vrreg_t __user *tm_v_regs = sigcontext_vmx_regs(tm_sc);
200 unsigned long msr = regs->msr;
203 BUG_ON(!MSR_TM_ACTIVE(regs->msr));
205 /* Remove TM bits from thread's MSR. The MSR in the sigcontext
206 * just indicates to userland that we were doing a transaction, but we
207 * don't want to return in transactional state. This also ensures
208 * that flush_fp_to_thread won't set TIF_RESTORE_TM again.
210 regs->msr &= ~MSR_TS_MASK;
212 flush_fp_to_thread(current);
214 #ifdef CONFIG_ALTIVEC
215 err |= __put_user(v_regs, &sc->v_regs);
216 err |= __put_user(tm_v_regs, &tm_sc->v_regs);
218 /* save altivec registers */
219 if (current->thread.used_vr) {
220 flush_altivec_to_thread(current);
221 /* Copy 33 vec registers (vr0..31 and vscr) to the stack */
222 err |= __copy_to_user(v_regs, ¤t->thread.vr_state,
223 33 * sizeof(vector128));
224 /* If VEC was enabled there are transactional VRs valid too,
225 * else they're a copy of the checkpointed VRs.
228 err |= __copy_to_user(tm_v_regs,
229 ¤t->thread.transact_vr,
230 33 * sizeof(vector128));
232 err |= __copy_to_user(tm_v_regs,
233 ¤t->thread.vr_state,
234 33 * sizeof(vector128));
236 /* set MSR_VEC in the MSR value in the frame to indicate
237 * that sc->v_reg contains valid data.
241 /* We always copy to/from vrsave, it's 0 if we don't have or don't
244 if (cpu_has_feature(CPU_FTR_ALTIVEC))
245 current->thread.vrsave = mfspr(SPRN_VRSAVE);
246 err |= __put_user(current->thread.vrsave, (u32 __user *)&v_regs[33]);
248 err |= __put_user(current->thread.transact_vrsave,
249 (u32 __user *)&tm_v_regs[33]);
251 err |= __put_user(current->thread.vrsave,
252 (u32 __user *)&tm_v_regs[33]);
254 #else /* CONFIG_ALTIVEC */
255 err |= __put_user(0, &sc->v_regs);
256 err |= __put_user(0, &tm_sc->v_regs);
257 #endif /* CONFIG_ALTIVEC */
259 /* copy fpr regs and fpscr */
260 err |= copy_fpr_to_user(&sc->fp_regs, current);
262 err |= copy_transact_fpr_to_user(&tm_sc->fp_regs, current);
264 err |= copy_fpr_to_user(&tm_sc->fp_regs, current);
268 * Copy VSX low doubleword to local buffer for formatting,
269 * then out to userspace. Update v_regs to point after the
272 if (current->thread.used_vsr) {
273 __giveup_vsx(current);
274 v_regs += ELF_NVRREG;
275 tm_v_regs += ELF_NVRREG;
277 err |= copy_vsx_to_user(v_regs, current);
280 err |= copy_transact_vsx_to_user(tm_v_regs, current);
282 err |= copy_vsx_to_user(tm_v_regs, current);
284 /* set MSR_VSX in the MSR value in the frame to
285 * indicate that sc->vs_reg) contains valid data.
289 #endif /* CONFIG_VSX */
291 err |= __put_user(&sc->gp_regs, &sc->regs);
292 err |= __put_user(&tm_sc->gp_regs, &tm_sc->regs);
293 WARN_ON(!FULL_REGS(regs));
294 err |= __copy_to_user(&tm_sc->gp_regs, regs, GP_REGS_SIZE);
295 err |= __copy_to_user(&sc->gp_regs,
296 ¤t->thread.ckpt_regs, GP_REGS_SIZE);
297 err |= __put_user(msr, &tm_sc->gp_regs[PT_MSR]);
298 err |= __put_user(msr, &sc->gp_regs[PT_MSR]);
299 err |= __put_user(signr, &sc->signal);
300 err |= __put_user(handler, &sc->handler);
302 err |= __put_user(set->sig[0], &sc->oldmask);
309 * Restore the sigcontext from the signal frame.
312 static long restore_sigcontext(struct pt_regs *regs, sigset_t *set, int sig,
313 struct sigcontext __user *sc)
315 #ifdef CONFIG_ALTIVEC
316 elf_vrreg_t __user *v_regs;
318 unsigned long err = 0;
319 unsigned long save_r13 = 0;
325 /* If this is not a signal return, we preserve the TLS in r13 */
327 save_r13 = regs->gpr[13];
330 err |= __copy_from_user(regs->gpr, sc->gp_regs, sizeof(regs->gpr));
331 err |= __get_user(regs->nip, &sc->gp_regs[PT_NIP]);
332 /* get MSR separately, transfer the LE bit if doing signal return */
333 err |= __get_user(msr, &sc->gp_regs[PT_MSR]);
335 regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE);
336 err |= __get_user(regs->orig_gpr3, &sc->gp_regs[PT_ORIG_R3]);
337 err |= __get_user(regs->ctr, &sc->gp_regs[PT_CTR]);
338 err |= __get_user(regs->link, &sc->gp_regs[PT_LNK]);
339 err |= __get_user(regs->xer, &sc->gp_regs[PT_XER]);
340 err |= __get_user(regs->ccr, &sc->gp_regs[PT_CCR]);
343 err |= __get_user(regs->dar, &sc->gp_regs[PT_DAR]);
344 err |= __get_user(regs->dsisr, &sc->gp_regs[PT_DSISR]);
345 err |= __get_user(regs->result, &sc->gp_regs[PT_RESULT]);
348 regs->gpr[13] = save_r13;
350 err |= __get_user(set->sig[0], &sc->oldmask);
353 * Do this before updating the thread state in
354 * current->thread.fpr/vr. That way, if we get preempted
355 * and another task grabs the FPU/Altivec, it won't be
356 * tempted to save the current CPU state into the thread_struct
357 * and corrupt what we are writing there.
359 discard_lazy_cpu_state();
362 * Force reload of FP/VEC.
363 * This has to be done before copying stuff into current->thread.fpr/vr
364 * for the reasons explained in the previous comment.
366 regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1 | MSR_VEC | MSR_VSX);
368 #ifdef CONFIG_ALTIVEC
369 err |= __get_user(v_regs, &sc->v_regs);
372 if (v_regs && !access_ok(VERIFY_READ, v_regs, 34 * sizeof(vector128)))
374 /* Copy 33 vec registers (vr0..31 and vscr) from the stack */
375 if (v_regs != NULL && (msr & MSR_VEC) != 0)
376 err |= __copy_from_user(¤t->thread.vr_state, v_regs,
377 33 * sizeof(vector128));
378 else if (current->thread.used_vr)
379 memset(¤t->thread.vr_state, 0, 33 * sizeof(vector128));
380 /* Always get VRSAVE back */
382 err |= __get_user(current->thread.vrsave, (u32 __user *)&v_regs[33]);
384 current->thread.vrsave = 0;
385 if (cpu_has_feature(CPU_FTR_ALTIVEC))
386 mtspr(SPRN_VRSAVE, current->thread.vrsave);
387 #endif /* CONFIG_ALTIVEC */
388 /* restore floating point */
389 err |= copy_fpr_from_user(current, &sc->fp_regs);
392 * Get additional VSX data. Update v_regs to point after the
393 * VMX data. Copy VSX low doubleword from userspace to local
394 * buffer for formatting, then into the taskstruct.
396 v_regs += ELF_NVRREG;
397 if ((msr & MSR_VSX) != 0)
398 err |= copy_vsx_from_user(current, v_regs);
400 for (i = 0; i < 32 ; i++)
401 current->thread.fp_state.fpr[i][TS_VSRLOWOFFSET] = 0;
406 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
408 * Restore the two sigcontexts from the frame of a transactional processes.
411 static long restore_tm_sigcontexts(struct pt_regs *regs,
412 struct sigcontext __user *sc,
413 struct sigcontext __user *tm_sc)
415 #ifdef CONFIG_ALTIVEC
416 elf_vrreg_t __user *v_regs, *tm_v_regs;
418 unsigned long err = 0;
424 err |= __copy_from_user(regs->gpr, tm_sc->gp_regs, sizeof(regs->gpr));
425 err |= __copy_from_user(¤t->thread.ckpt_regs, sc->gp_regs,
429 * TFHAR is restored from the checkpointed 'wound-back' ucontext's NIP.
430 * TEXASR was set by the signal delivery reclaim, as was TFIAR.
431 * Users doing anything abhorrent like thread-switching w/ signals for
432 * TM-Suspended code will have to back TEXASR/TFIAR up themselves.
433 * For the case of getting a signal and simply returning from it,
434 * we don't need to re-copy them here.
436 err |= __get_user(regs->nip, &tm_sc->gp_regs[PT_NIP]);
437 err |= __get_user(current->thread.tm_tfhar, &sc->gp_regs[PT_NIP]);
439 /* get MSR separately, transfer the LE bit if doing signal return */
440 err |= __get_user(msr, &sc->gp_regs[PT_MSR]);
441 /* Don't allow reserved mode. */
442 if (MSR_TM_RESV(msr))
445 /* pull in MSR TM from user context */
446 regs->msr = (regs->msr & ~MSR_TS_MASK) | (msr & MSR_TS_MASK);
448 /* pull in MSR LE from user context */
449 regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE);
451 /* The following non-GPR non-FPR non-VR state is also checkpointed: */
452 err |= __get_user(regs->ctr, &tm_sc->gp_regs[PT_CTR]);
453 err |= __get_user(regs->link, &tm_sc->gp_regs[PT_LNK]);
454 err |= __get_user(regs->xer, &tm_sc->gp_regs[PT_XER]);
455 err |= __get_user(regs->ccr, &tm_sc->gp_regs[PT_CCR]);
456 err |= __get_user(current->thread.ckpt_regs.ctr,
457 &sc->gp_regs[PT_CTR]);
458 err |= __get_user(current->thread.ckpt_regs.link,
459 &sc->gp_regs[PT_LNK]);
460 err |= __get_user(current->thread.ckpt_regs.xer,
461 &sc->gp_regs[PT_XER]);
462 err |= __get_user(current->thread.ckpt_regs.ccr,
463 &sc->gp_regs[PT_CCR]);
465 /* Don't allow userspace to set the trap value */
468 /* These regs are not checkpointed; they can go in 'regs'. */
469 err |= __get_user(regs->dar, &sc->gp_regs[PT_DAR]);
470 err |= __get_user(regs->dsisr, &sc->gp_regs[PT_DSISR]);
471 err |= __get_user(regs->result, &sc->gp_regs[PT_RESULT]);
474 * Do this before updating the thread state in
475 * current->thread.fpr/vr. That way, if we get preempted
476 * and another task grabs the FPU/Altivec, it won't be
477 * tempted to save the current CPU state into the thread_struct
478 * and corrupt what we are writing there.
480 discard_lazy_cpu_state();
483 * Force reload of FP/VEC.
484 * This has to be done before copying stuff into current->thread.fpr/vr
485 * for the reasons explained in the previous comment.
487 regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1 | MSR_VEC | MSR_VSX);
489 #ifdef CONFIG_ALTIVEC
490 err |= __get_user(v_regs, &sc->v_regs);
491 err |= __get_user(tm_v_regs, &tm_sc->v_regs);
494 if (v_regs && !access_ok(VERIFY_READ, v_regs, 34 * sizeof(vector128)))
496 if (tm_v_regs && !access_ok(VERIFY_READ,
497 tm_v_regs, 34 * sizeof(vector128)))
499 /* Copy 33 vec registers (vr0..31 and vscr) from the stack */
500 if (v_regs != NULL && tm_v_regs != NULL && (msr & MSR_VEC) != 0) {
501 err |= __copy_from_user(¤t->thread.vr_state, v_regs,
502 33 * sizeof(vector128));
503 err |= __copy_from_user(¤t->thread.transact_vr, tm_v_regs,
504 33 * sizeof(vector128));
506 else if (current->thread.used_vr) {
507 memset(¤t->thread.vr_state, 0, 33 * sizeof(vector128));
508 memset(¤t->thread.transact_vr, 0, 33 * sizeof(vector128));
510 /* Always get VRSAVE back */
511 if (v_regs != NULL && tm_v_regs != NULL) {
512 err |= __get_user(current->thread.vrsave,
513 (u32 __user *)&v_regs[33]);
514 err |= __get_user(current->thread.transact_vrsave,
515 (u32 __user *)&tm_v_regs[33]);
518 current->thread.vrsave = 0;
519 current->thread.transact_vrsave = 0;
521 if (cpu_has_feature(CPU_FTR_ALTIVEC))
522 mtspr(SPRN_VRSAVE, current->thread.vrsave);
523 #endif /* CONFIG_ALTIVEC */
524 /* restore floating point */
525 err |= copy_fpr_from_user(current, &sc->fp_regs);
526 err |= copy_transact_fpr_from_user(current, &tm_sc->fp_regs);
529 * Get additional VSX data. Update v_regs to point after the
530 * VMX data. Copy VSX low doubleword from userspace to local
531 * buffer for formatting, then into the taskstruct.
533 if (v_regs && ((msr & MSR_VSX) != 0)) {
534 v_regs += ELF_NVRREG;
535 tm_v_regs += ELF_NVRREG;
536 err |= copy_vsx_from_user(current, v_regs);
537 err |= copy_transact_vsx_from_user(current, tm_v_regs);
539 for (i = 0; i < 32 ; i++) {
540 current->thread.fp_state.fpr[i][TS_VSRLOWOFFSET] = 0;
541 current->thread.transact_fp.fpr[i][TS_VSRLOWOFFSET] = 0;
546 /* Make sure the transaction is marked as failed */
547 current->thread.tm_texasr |= TEXASR_FS;
548 /* This loads the checkpointed FP/VEC state, if used */
549 tm_recheckpoint(¤t->thread, msr);
551 /* This loads the speculative FP/VEC state, if used */
553 do_load_up_transact_fpu(¤t->thread);
554 regs->msr |= (MSR_FP | current->thread.fpexc_mode);
556 #ifdef CONFIG_ALTIVEC
558 do_load_up_transact_altivec(¤t->thread);
559 regs->msr |= MSR_VEC;
568 * Setup the trampoline code on the stack
570 static long setup_trampoline(unsigned int syscall, unsigned int __user *tramp)
575 /* addi r1, r1, __SIGNAL_FRAMESIZE # Pop the dummy stackframe */
576 err |= __put_user(0x38210000UL | (__SIGNAL_FRAMESIZE & 0xffff), &tramp[0]);
577 /* li r0, __NR_[rt_]sigreturn| */
578 err |= __put_user(0x38000000UL | (syscall & 0xffff), &tramp[1]);
580 err |= __put_user(0x44000002UL, &tramp[2]);
582 /* Minimal traceback info */
583 for (i=TRAMP_TRACEBACK; i < TRAMP_SIZE ;i++)
584 err |= __put_user(0, &tramp[i]);
587 flush_icache_range((unsigned long) &tramp[0],
588 (unsigned long) &tramp[TRAMP_SIZE]);
594 * Userspace code may pass a ucontext which doesn't include VSX added
595 * at the end. We need to check for this case.
597 #define UCONTEXTSIZEWITHOUTVSX \
598 (sizeof(struct ucontext) - 32*sizeof(long))
601 * Handle {get,set,swap}_context operations
603 int sys_swapcontext(struct ucontext __user *old_ctx,
604 struct ucontext __user *new_ctx,
605 long ctx_size, long r6, long r7, long r8, struct pt_regs *regs)
609 unsigned long new_msr = 0;
610 int ctx_has_vsx_region = 0;
613 get_user(new_msr, &new_ctx->uc_mcontext.gp_regs[PT_MSR]))
616 * Check that the context is not smaller than the original
617 * size (with VMX but without VSX)
619 if (ctx_size < UCONTEXTSIZEWITHOUTVSX)
622 * If the new context state sets the MSR VSX bits but
623 * it doesn't provide VSX state.
625 if ((ctx_size < sizeof(struct ucontext)) &&
628 /* Does the context have enough room to store VSX data? */
629 if (ctx_size >= sizeof(struct ucontext))
630 ctx_has_vsx_region = 1;
632 if (old_ctx != NULL) {
633 if (!access_ok(VERIFY_WRITE, old_ctx, ctx_size)
634 || setup_sigcontext(&old_ctx->uc_mcontext, regs, 0, NULL, 0,
636 || __copy_to_user(&old_ctx->uc_sigmask,
637 ¤t->blocked, sizeof(sigset_t)))
642 if (!access_ok(VERIFY_READ, new_ctx, ctx_size)
643 || __get_user(tmp, (u8 __user *) new_ctx)
644 || __get_user(tmp, (u8 __user *) new_ctx + ctx_size - 1))
648 * If we get a fault copying the context into the kernel's
649 * image of the user's registers, we can't just return -EFAULT
650 * because the user's registers will be corrupted. For instance
651 * the NIP value may have been updated but not some of the
652 * other registers. Given that we have done the access_ok
653 * and successfully read the first and last bytes of the region
654 * above, this should only happen in an out-of-memory situation
655 * or if another thread unmaps the region containing the context.
656 * We kill the task with a SIGSEGV in this situation.
659 if (__copy_from_user(&set, &new_ctx->uc_sigmask, sizeof(set)))
661 set_current_blocked(&set);
662 if (restore_sigcontext(regs, NULL, 0, &new_ctx->uc_mcontext))
665 /* This returns like rt_sigreturn */
666 set_thread_flag(TIF_RESTOREALL);
672 * Do a signal return; undo the signal stack.
675 int sys_rt_sigreturn(unsigned long r3, unsigned long r4, unsigned long r5,
676 unsigned long r6, unsigned long r7, unsigned long r8,
677 struct pt_regs *regs)
679 struct ucontext __user *uc = (struct ucontext __user *)regs->gpr[1];
681 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
685 /* Always make any pending restarted system calls return -EINTR */
686 current->restart_block.fn = do_no_restart_syscall;
688 if (!access_ok(VERIFY_READ, uc, sizeof(*uc)))
691 if (__copy_from_user(&set, &uc->uc_sigmask, sizeof(set)))
693 set_current_blocked(&set);
694 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
695 if (__get_user(msr, &uc->uc_mcontext.gp_regs[PT_MSR]))
697 if (MSR_TM_ACTIVE(msr)) {
698 /* We recheckpoint on return. */
699 struct ucontext __user *uc_transact;
701 /* Trying to start TM on non TM system */
702 if (!cpu_has_feature(CPU_FTR_TM))
705 if (__get_user(uc_transact, &uc->uc_link))
707 if (restore_tm_sigcontexts(regs, &uc->uc_mcontext,
708 &uc_transact->uc_mcontext))
712 /* Fall through, for non-TM restore */
714 if (restore_sigcontext(regs, NULL, 1, &uc->uc_mcontext))
717 if (restore_altstack(&uc->uc_stack))
720 set_thread_flag(TIF_RESTOREALL);
724 if (show_unhandled_signals)
725 printk_ratelimited(regs->msr & MSR_64BIT ? fmt64 : fmt32,
726 current->comm, current->pid, "rt_sigreturn",
727 (long)uc, regs->nip, regs->link);
729 force_sig(SIGSEGV, current);
733 int handle_rt_signal64(struct ksignal *ksig, sigset_t *set, struct pt_regs *regs)
735 struct rt_sigframe __user *frame;
736 unsigned long newsp = 0;
739 frame = get_sigframe(ksig, get_tm_stackpointer(regs), sizeof(*frame), 0);
740 if (unlikely(frame == NULL))
743 err |= __put_user(&frame->info, &frame->pinfo);
744 err |= __put_user(&frame->uc, &frame->puc);
745 err |= copy_siginfo_to_user(&frame->info, &ksig->info);
749 /* Create the ucontext. */
750 err |= __put_user(0, &frame->uc.uc_flags);
751 err |= __save_altstack(&frame->uc.uc_stack, regs->gpr[1]);
752 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
753 if (MSR_TM_ACTIVE(regs->msr)) {
754 /* The ucontext_t passed to userland points to the second
755 * ucontext_t (for transactional state) with its uc_link ptr.
757 err |= __put_user(&frame->uc_transact, &frame->uc.uc_link);
758 err |= setup_tm_sigcontexts(&frame->uc.uc_mcontext,
759 &frame->uc_transact.uc_mcontext,
762 (unsigned long)ksig->ka.sa.sa_handler);
766 err |= __put_user(0, &frame->uc.uc_link);
767 err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, ksig->sig,
768 NULL, (unsigned long)ksig->ka.sa.sa_handler,
771 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
775 /* Make sure signal handler doesn't get spurious FP exceptions */
776 current->thread.fp_state.fpscr = 0;
778 /* Set up to return from userspace. */
779 if (vdso64_rt_sigtramp && current->mm->context.vdso_base) {
780 regs->link = current->mm->context.vdso_base + vdso64_rt_sigtramp;
782 err |= setup_trampoline(__NR_rt_sigreturn, &frame->tramp[0]);
785 regs->link = (unsigned long) &frame->tramp[0];
788 /* Allocate a dummy caller frame for the signal handler. */
789 newsp = ((unsigned long)frame) - __SIGNAL_FRAMESIZE;
790 err |= put_user(regs->gpr[1], (unsigned long __user *)newsp);
792 /* Set up "regs" so we "return" to the signal handler. */
793 if (is_elf2_task()) {
794 regs->nip = (unsigned long) ksig->ka.sa.sa_handler;
795 regs->gpr[12] = regs->nip;
797 /* Handler is *really* a pointer to the function descriptor for
798 * the signal routine. The first entry in the function
799 * descriptor is the entry address of signal and the second
800 * entry is the TOC value we need to use.
802 func_descr_t __user *funct_desc_ptr =
803 (func_descr_t __user *) ksig->ka.sa.sa_handler;
805 err |= get_user(regs->nip, &funct_desc_ptr->entry);
806 err |= get_user(regs->gpr[2], &funct_desc_ptr->toc);
809 /* enter the signal handler in native-endian mode */
810 regs->msr &= ~MSR_LE;
811 regs->msr |= (MSR_KERNEL & MSR_LE);
812 regs->gpr[1] = newsp;
813 regs->gpr[3] = ksig->sig;
815 if (ksig->ka.sa.sa_flags & SA_SIGINFO) {
816 err |= get_user(regs->gpr[4], (unsigned long __user *)&frame->pinfo);
817 err |= get_user(regs->gpr[5], (unsigned long __user *)&frame->puc);
818 regs->gpr[6] = (unsigned long) frame;
820 regs->gpr[4] = (unsigned long)&frame->uc.uc_mcontext;
828 if (show_unhandled_signals)
829 printk_ratelimited(regs->msr & MSR_64BIT ? fmt64 : fmt32,
830 current->comm, current->pid, "setup_rt_frame",
831 (long)frame, regs->nip, regs->link);