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 <linux/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>
38 #include <asm/asm-prototypes.h>
43 #define GP_REGS_SIZE min(sizeof(elf_gregset_t), sizeof(struct pt_regs))
44 #define FP_REGS_SIZE sizeof(elf_fpregset_t)
46 #define TRAMP_TRACEBACK 3
50 * When we have signals to deliver, we set up on the user stack,
51 * going down from the original stack pointer:
52 * 1) a rt_sigframe struct which contains the ucontext
53 * 2) a gap of __SIGNAL_FRAMESIZE bytes which acts as a dummy caller
54 * frame for the signal handler.
58 /* sys_rt_sigreturn requires the ucontext be the first field */
60 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
61 struct ucontext uc_transact;
63 unsigned long _unused[2];
64 unsigned int tramp[TRAMP_SIZE];
65 struct siginfo __user *pinfo;
68 /* New 64 bit little-endian ABI allows redzone of 512 bytes below sp */
69 char abigap[USER_REDZONE_SIZE];
70 } __attribute__ ((aligned (16)));
72 static const char fmt32[] = KERN_INFO \
73 "%s[%d]: bad frame in %s: %08lx nip %08lx lr %08lx\n";
74 static const char fmt64[] = KERN_INFO \
75 "%s[%d]: bad frame in %s: %016lx nip %016lx lr %016lx\n";
78 * This computes a quad word aligned pointer inside the vmx_reserve array
79 * element. For historical reasons sigcontext might not be quad word aligned,
80 * but the location we write the VMX regs to must be. See the comment in
81 * sigcontext for more detail.
84 static elf_vrreg_t __user *sigcontext_vmx_regs(struct sigcontext __user *sc)
86 return (elf_vrreg_t __user *) (((unsigned long)sc->vmx_reserve + 15) & ~0xful);
91 * Set up the sigcontext for the signal frame.
94 static long setup_sigcontext(struct sigcontext __user *sc,
95 struct task_struct *tsk, int signr, sigset_t *set,
96 unsigned long handler, int ctx_has_vsx_region)
98 /* When CONFIG_ALTIVEC is set, we _always_ setup v_regs even if the
99 * process never used altivec yet (MSR_VEC is zero in pt_regs of
100 * the context). This is very important because we must ensure we
101 * don't lose the VRSAVE content that may have been set prior to
102 * the process doing its first vector operation
103 * Userland shall check AT_HWCAP to know whether it can rely on the
104 * v_regs pointer or not
106 #ifdef CONFIG_ALTIVEC
107 elf_vrreg_t __user *v_regs = sigcontext_vmx_regs(sc);
108 unsigned long vrsave;
110 struct pt_regs *regs = tsk->thread.regs;
111 unsigned long msr = regs->msr;
114 BUG_ON(tsk != current);
116 #ifdef CONFIG_ALTIVEC
117 err |= __put_user(v_regs, &sc->v_regs);
119 /* save altivec registers */
120 if (tsk->thread.used_vr) {
121 flush_altivec_to_thread(tsk);
122 /* Copy 33 vec registers (vr0..31 and vscr) to the stack */
123 err |= __copy_to_user(v_regs, &tsk->thread.vr_state,
124 33 * sizeof(vector128));
125 /* set MSR_VEC in the MSR value in the frame to indicate that sc->v_reg)
126 * contains valid data.
130 /* We always copy to/from vrsave, it's 0 if we don't have or don't
134 if (cpu_has_feature(CPU_FTR_ALTIVEC)) {
135 vrsave = mfspr(SPRN_VRSAVE);
136 tsk->thread.vrsave = vrsave;
139 err |= __put_user(vrsave, (u32 __user *)&v_regs[33]);
140 #else /* CONFIG_ALTIVEC */
141 err |= __put_user(0, &sc->v_regs);
142 #endif /* CONFIG_ALTIVEC */
143 flush_fp_to_thread(tsk);
144 /* copy fpr regs and fpscr */
145 err |= copy_fpr_to_user(&sc->fp_regs, tsk);
148 * Clear the MSR VSX bit to indicate there is no valid state attached
149 * to this context, except in the specific case below where we set it.
154 * Copy VSX low doubleword to local buffer for formatting,
155 * then out to userspace. Update v_regs to point after the
158 if (tsk->thread.used_vsr && ctx_has_vsx_region) {
159 flush_vsx_to_thread(tsk);
160 v_regs += ELF_NVRREG;
161 err |= copy_vsx_to_user(v_regs, tsk);
162 /* set MSR_VSX in the MSR value in the frame to
163 * indicate that sc->vs_reg) contains valid data.
167 #endif /* CONFIG_VSX */
168 err |= __put_user(&sc->gp_regs, &sc->regs);
169 WARN_ON(!FULL_REGS(regs));
170 err |= __copy_to_user(&sc->gp_regs, regs, GP_REGS_SIZE);
171 err |= __put_user(msr, &sc->gp_regs[PT_MSR]);
172 err |= __put_user(signr, &sc->signal);
173 err |= __put_user(handler, &sc->handler);
175 err |= __put_user(set->sig[0], &sc->oldmask);
180 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
182 * As above, but Transactional Memory is in use, so deliver sigcontexts
183 * containing checkpointed and transactional register states.
185 * To do this, we treclaim (done before entering here) to gather both sets of
186 * registers and set up the 'normal' sigcontext registers with rolled-back
187 * register values such that a simple signal handler sees a correct
188 * checkpointed register state. If interested, a TM-aware sighandler can
189 * examine the transactional registers in the 2nd sigcontext to determine the
190 * real origin of the signal.
192 static long setup_tm_sigcontexts(struct sigcontext __user *sc,
193 struct sigcontext __user *tm_sc,
194 struct task_struct *tsk,
195 int signr, sigset_t *set, unsigned long handler)
197 /* When CONFIG_ALTIVEC is set, we _always_ setup v_regs even if the
198 * process never used altivec yet (MSR_VEC is zero in pt_regs of
199 * the context). This is very important because we must ensure we
200 * don't lose the VRSAVE content that may have been set prior to
201 * the process doing its first vector operation
202 * Userland shall check AT_HWCAP to know wether it can rely on the
203 * v_regs pointer or not.
205 #ifdef CONFIG_ALTIVEC
206 elf_vrreg_t __user *v_regs = sigcontext_vmx_regs(sc);
207 elf_vrreg_t __user *tm_v_regs = sigcontext_vmx_regs(tm_sc);
209 struct pt_regs *regs = tsk->thread.regs;
210 unsigned long msr = tsk->thread.ckpt_regs.msr;
213 BUG_ON(tsk != current);
215 BUG_ON(!MSR_TM_ACTIVE(regs->msr));
217 WARN_ON(tm_suspend_disabled);
219 /* Remove TM bits from thread's MSR. The MSR in the sigcontext
220 * just indicates to userland that we were doing a transaction, but we
221 * don't want to return in transactional state. This also ensures
222 * that flush_fp_to_thread won't set TIF_RESTORE_TM again.
224 regs->msr &= ~MSR_TS_MASK;
226 #ifdef CONFIG_ALTIVEC
227 err |= __put_user(v_regs, &sc->v_regs);
228 err |= __put_user(tm_v_regs, &tm_sc->v_regs);
230 /* save altivec registers */
231 if (tsk->thread.used_vr) {
232 /* Copy 33 vec registers (vr0..31 and vscr) to the stack */
233 err |= __copy_to_user(v_regs, &tsk->thread.ckvr_state,
234 33 * sizeof(vector128));
235 /* If VEC was enabled there are transactional VRs valid too,
236 * else they're a copy of the checkpointed VRs.
239 err |= __copy_to_user(tm_v_regs,
240 &tsk->thread.vr_state,
241 33 * sizeof(vector128));
243 err |= __copy_to_user(tm_v_regs,
244 &tsk->thread.ckvr_state,
245 33 * sizeof(vector128));
247 /* set MSR_VEC in the MSR value in the frame to indicate
248 * that sc->v_reg contains valid data.
252 /* We always copy to/from vrsave, it's 0 if we don't have or don't
255 if (cpu_has_feature(CPU_FTR_ALTIVEC))
256 tsk->thread.ckvrsave = mfspr(SPRN_VRSAVE);
257 err |= __put_user(tsk->thread.ckvrsave, (u32 __user *)&v_regs[33]);
259 err |= __put_user(tsk->thread.vrsave,
260 (u32 __user *)&tm_v_regs[33]);
262 err |= __put_user(tsk->thread.ckvrsave,
263 (u32 __user *)&tm_v_regs[33]);
265 #else /* CONFIG_ALTIVEC */
266 err |= __put_user(0, &sc->v_regs);
267 err |= __put_user(0, &tm_sc->v_regs);
268 #endif /* CONFIG_ALTIVEC */
270 /* copy fpr regs and fpscr */
271 err |= copy_ckfpr_to_user(&sc->fp_regs, tsk);
273 err |= copy_fpr_to_user(&tm_sc->fp_regs, tsk);
275 err |= copy_ckfpr_to_user(&tm_sc->fp_regs, tsk);
279 * Copy VSX low doubleword to local buffer for formatting,
280 * then out to userspace. Update v_regs to point after the
283 if (tsk->thread.used_vsr) {
284 v_regs += ELF_NVRREG;
285 tm_v_regs += ELF_NVRREG;
287 err |= copy_ckvsx_to_user(v_regs, tsk);
290 err |= copy_vsx_to_user(tm_v_regs, tsk);
292 err |= copy_ckvsx_to_user(tm_v_regs, tsk);
294 /* set MSR_VSX in the MSR value in the frame to
295 * indicate that sc->vs_reg) contains valid data.
299 #endif /* CONFIG_VSX */
301 err |= __put_user(&sc->gp_regs, &sc->regs);
302 err |= __put_user(&tm_sc->gp_regs, &tm_sc->regs);
303 WARN_ON(!FULL_REGS(regs));
304 err |= __copy_to_user(&tm_sc->gp_regs, regs, GP_REGS_SIZE);
305 err |= __copy_to_user(&sc->gp_regs,
306 &tsk->thread.ckpt_regs, GP_REGS_SIZE);
307 err |= __put_user(msr, &tm_sc->gp_regs[PT_MSR]);
308 err |= __put_user(msr, &sc->gp_regs[PT_MSR]);
309 err |= __put_user(signr, &sc->signal);
310 err |= __put_user(handler, &sc->handler);
312 err |= __put_user(set->sig[0], &sc->oldmask);
319 * Restore the sigcontext from the signal frame.
322 static long restore_sigcontext(struct task_struct *tsk, sigset_t *set, int sig,
323 struct sigcontext __user *sc)
325 #ifdef CONFIG_ALTIVEC
326 elf_vrreg_t __user *v_regs;
328 unsigned long err = 0;
329 unsigned long save_r13 = 0;
331 struct pt_regs *regs = tsk->thread.regs;
336 BUG_ON(tsk != current);
338 /* If this is not a signal return, we preserve the TLS in r13 */
340 save_r13 = regs->gpr[13];
343 err |= __copy_from_user(regs->gpr, sc->gp_regs, sizeof(regs->gpr));
344 err |= __get_user(regs->nip, &sc->gp_regs[PT_NIP]);
345 /* get MSR separately, transfer the LE bit if doing signal return */
346 err |= __get_user(msr, &sc->gp_regs[PT_MSR]);
348 regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE);
349 err |= __get_user(regs->orig_gpr3, &sc->gp_regs[PT_ORIG_R3]);
350 err |= __get_user(regs->ctr, &sc->gp_regs[PT_CTR]);
351 err |= __get_user(regs->link, &sc->gp_regs[PT_LNK]);
352 err |= __get_user(regs->xer, &sc->gp_regs[PT_XER]);
353 err |= __get_user(regs->ccr, &sc->gp_regs[PT_CCR]);
356 err |= __get_user(regs->dar, &sc->gp_regs[PT_DAR]);
357 err |= __get_user(regs->dsisr, &sc->gp_regs[PT_DSISR]);
358 err |= __get_user(regs->result, &sc->gp_regs[PT_RESULT]);
361 regs->gpr[13] = save_r13;
363 err |= __get_user(set->sig[0], &sc->oldmask);
366 * Force reload of FP/VEC.
367 * This has to be done before copying stuff into tsk->thread.fpr/vr
368 * for the reasons explained in the previous comment.
370 regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1 | MSR_VEC | MSR_VSX);
372 #ifdef CONFIG_ALTIVEC
373 err |= __get_user(v_regs, &sc->v_regs);
376 if (v_regs && !access_ok(VERIFY_READ, v_regs, 34 * sizeof(vector128)))
378 /* Copy 33 vec registers (vr0..31 and vscr) from the stack */
379 if (v_regs != NULL && (msr & MSR_VEC) != 0) {
380 err |= __copy_from_user(&tsk->thread.vr_state, v_regs,
381 33 * sizeof(vector128));
382 tsk->thread.used_vr = true;
383 } else if (tsk->thread.used_vr) {
384 memset(&tsk->thread.vr_state, 0, 33 * sizeof(vector128));
386 /* Always get VRSAVE back */
388 err |= __get_user(tsk->thread.vrsave, (u32 __user *)&v_regs[33]);
390 tsk->thread.vrsave = 0;
391 if (cpu_has_feature(CPU_FTR_ALTIVEC))
392 mtspr(SPRN_VRSAVE, tsk->thread.vrsave);
393 #endif /* CONFIG_ALTIVEC */
394 /* restore floating point */
395 err |= copy_fpr_from_user(tsk, &sc->fp_regs);
398 * Get additional VSX data. Update v_regs to point after the
399 * VMX data. Copy VSX low doubleword from userspace to local
400 * buffer for formatting, then into the taskstruct.
402 v_regs += ELF_NVRREG;
403 if ((msr & MSR_VSX) != 0) {
404 err |= copy_vsx_from_user(tsk, v_regs);
405 tsk->thread.used_vsr = true;
407 for (i = 0; i < 32 ; i++)
408 tsk->thread.fp_state.fpr[i][TS_VSRLOWOFFSET] = 0;
414 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
416 * Restore the two sigcontexts from the frame of a transactional processes.
419 static long restore_tm_sigcontexts(struct task_struct *tsk,
420 struct sigcontext __user *sc,
421 struct sigcontext __user *tm_sc)
423 #ifdef CONFIG_ALTIVEC
424 elf_vrreg_t __user *v_regs, *tm_v_regs;
426 unsigned long err = 0;
428 struct pt_regs *regs = tsk->thread.regs;
433 BUG_ON(tsk != current);
435 if (tm_suspend_disabled)
439 err |= __copy_from_user(regs->gpr, tm_sc->gp_regs, sizeof(regs->gpr));
440 err |= __copy_from_user(&tsk->thread.ckpt_regs, sc->gp_regs,
444 * TFHAR is restored from the checkpointed 'wound-back' ucontext's NIP.
445 * TEXASR was set by the signal delivery reclaim, as was TFIAR.
446 * Users doing anything abhorrent like thread-switching w/ signals for
447 * TM-Suspended code will have to back TEXASR/TFIAR up themselves.
448 * For the case of getting a signal and simply returning from it,
449 * we don't need to re-copy them here.
451 err |= __get_user(regs->nip, &tm_sc->gp_regs[PT_NIP]);
452 err |= __get_user(tsk->thread.tm_tfhar, &sc->gp_regs[PT_NIP]);
454 /* get MSR separately, transfer the LE bit if doing signal return */
455 err |= __get_user(msr, &sc->gp_regs[PT_MSR]);
456 /* Don't allow reserved mode. */
457 if (MSR_TM_RESV(msr))
460 /* pull in MSR TS bits from user context */
461 regs->msr = (regs->msr & ~MSR_TS_MASK) | (msr & MSR_TS_MASK);
464 * Ensure that TM is enabled in regs->msr before we leave the signal
465 * handler. It could be the case that (a) user disabled the TM bit
466 * through the manipulation of the MSR bits in uc_mcontext or (b) the
467 * TM bit was disabled because a sufficient number of context switches
468 * happened whilst in the signal handler and load_tm overflowed,
469 * disabling the TM bit. In either case we can end up with an illegal
470 * TM state leading to a TM Bad Thing when we return to userspace.
474 /* pull in MSR LE from user context */
475 regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE);
477 /* The following non-GPR non-FPR non-VR state is also checkpointed: */
478 err |= __get_user(regs->ctr, &tm_sc->gp_regs[PT_CTR]);
479 err |= __get_user(regs->link, &tm_sc->gp_regs[PT_LNK]);
480 err |= __get_user(regs->xer, &tm_sc->gp_regs[PT_XER]);
481 err |= __get_user(regs->ccr, &tm_sc->gp_regs[PT_CCR]);
482 err |= __get_user(tsk->thread.ckpt_regs.ctr,
483 &sc->gp_regs[PT_CTR]);
484 err |= __get_user(tsk->thread.ckpt_regs.link,
485 &sc->gp_regs[PT_LNK]);
486 err |= __get_user(tsk->thread.ckpt_regs.xer,
487 &sc->gp_regs[PT_XER]);
488 err |= __get_user(tsk->thread.ckpt_regs.ccr,
489 &sc->gp_regs[PT_CCR]);
491 /* These regs are not checkpointed; they can go in 'regs'. */
492 err |= __get_user(regs->trap, &sc->gp_regs[PT_TRAP]);
493 err |= __get_user(regs->dar, &sc->gp_regs[PT_DAR]);
494 err |= __get_user(regs->dsisr, &sc->gp_regs[PT_DSISR]);
495 err |= __get_user(regs->result, &sc->gp_regs[PT_RESULT]);
498 * Force reload of FP/VEC.
499 * This has to be done before copying stuff into tsk->thread.fpr/vr
500 * for the reasons explained in the previous comment.
502 regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1 | MSR_VEC | MSR_VSX);
504 #ifdef CONFIG_ALTIVEC
505 err |= __get_user(v_regs, &sc->v_regs);
506 err |= __get_user(tm_v_regs, &tm_sc->v_regs);
509 if (v_regs && !access_ok(VERIFY_READ, v_regs, 34 * sizeof(vector128)))
511 if (tm_v_regs && !access_ok(VERIFY_READ,
512 tm_v_regs, 34 * sizeof(vector128)))
514 /* Copy 33 vec registers (vr0..31 and vscr) from the stack */
515 if (v_regs != NULL && tm_v_regs != NULL && (msr & MSR_VEC) != 0) {
516 err |= __copy_from_user(&tsk->thread.ckvr_state, v_regs,
517 33 * sizeof(vector128));
518 err |= __copy_from_user(&tsk->thread.vr_state, tm_v_regs,
519 33 * sizeof(vector128));
520 current->thread.used_vr = true;
522 else if (tsk->thread.used_vr) {
523 memset(&tsk->thread.vr_state, 0, 33 * sizeof(vector128));
524 memset(&tsk->thread.ckvr_state, 0, 33 * sizeof(vector128));
526 /* Always get VRSAVE back */
527 if (v_regs != NULL && tm_v_regs != NULL) {
528 err |= __get_user(tsk->thread.ckvrsave,
529 (u32 __user *)&v_regs[33]);
530 err |= __get_user(tsk->thread.vrsave,
531 (u32 __user *)&tm_v_regs[33]);
534 tsk->thread.vrsave = 0;
535 tsk->thread.ckvrsave = 0;
537 if (cpu_has_feature(CPU_FTR_ALTIVEC))
538 mtspr(SPRN_VRSAVE, tsk->thread.vrsave);
539 #endif /* CONFIG_ALTIVEC */
540 /* restore floating point */
541 err |= copy_fpr_from_user(tsk, &tm_sc->fp_regs);
542 err |= copy_ckfpr_from_user(tsk, &sc->fp_regs);
545 * Get additional VSX data. Update v_regs to point after the
546 * VMX data. Copy VSX low doubleword from userspace to local
547 * buffer for formatting, then into the taskstruct.
549 if (v_regs && ((msr & MSR_VSX) != 0)) {
550 v_regs += ELF_NVRREG;
551 tm_v_regs += ELF_NVRREG;
552 err |= copy_vsx_from_user(tsk, tm_v_regs);
553 err |= copy_ckvsx_from_user(tsk, v_regs);
554 tsk->thread.used_vsr = true;
556 for (i = 0; i < 32 ; i++) {
557 tsk->thread.fp_state.fpr[i][TS_VSRLOWOFFSET] = 0;
558 tsk->thread.ckfp_state.fpr[i][TS_VSRLOWOFFSET] = 0;
563 /* Make sure the transaction is marked as failed */
564 tsk->thread.tm_texasr |= TEXASR_FS;
565 /* This loads the checkpointed FP/VEC state, if used */
566 tm_recheckpoint(&tsk->thread);
568 msr_check_and_set(msr & (MSR_FP | MSR_VEC));
570 load_fp_state(&tsk->thread.fp_state);
571 regs->msr |= (MSR_FP | tsk->thread.fpexc_mode);
574 load_vr_state(&tsk->thread.vr_state);
575 regs->msr |= MSR_VEC;
583 * Setup the trampoline code on the stack
585 static long setup_trampoline(unsigned int syscall, unsigned int __user *tramp)
590 /* addi r1, r1, __SIGNAL_FRAMESIZE # Pop the dummy stackframe */
591 err |= __put_user(0x38210000UL | (__SIGNAL_FRAMESIZE & 0xffff), &tramp[0]);
592 /* li r0, __NR_[rt_]sigreturn| */
593 err |= __put_user(0x38000000UL | (syscall & 0xffff), &tramp[1]);
595 err |= __put_user(0x44000002UL, &tramp[2]);
597 /* Minimal traceback info */
598 for (i=TRAMP_TRACEBACK; i < TRAMP_SIZE ;i++)
599 err |= __put_user(0, &tramp[i]);
602 flush_icache_range((unsigned long) &tramp[0],
603 (unsigned long) &tramp[TRAMP_SIZE]);
609 * Userspace code may pass a ucontext which doesn't include VSX added
610 * at the end. We need to check for this case.
612 #define UCONTEXTSIZEWITHOUTVSX \
613 (sizeof(struct ucontext) - 32*sizeof(long))
616 * Handle {get,set,swap}_context operations
618 int sys_swapcontext(struct ucontext __user *old_ctx,
619 struct ucontext __user *new_ctx,
620 long ctx_size, long r6, long r7, long r8, struct pt_regs *regs)
624 unsigned long new_msr = 0;
625 int ctx_has_vsx_region = 0;
627 BUG_ON(regs != current->thread.regs);
630 get_user(new_msr, &new_ctx->uc_mcontext.gp_regs[PT_MSR]))
633 * Check that the context is not smaller than the original
634 * size (with VMX but without VSX)
636 if (ctx_size < UCONTEXTSIZEWITHOUTVSX)
639 * If the new context state sets the MSR VSX bits but
640 * it doesn't provide VSX state.
642 if ((ctx_size < sizeof(struct ucontext)) &&
645 /* Does the context have enough room to store VSX data? */
646 if (ctx_size >= sizeof(struct ucontext))
647 ctx_has_vsx_region = 1;
649 if (old_ctx != NULL) {
650 if (!access_ok(VERIFY_WRITE, old_ctx, ctx_size)
651 || setup_sigcontext(&old_ctx->uc_mcontext, current, 0, NULL, 0,
653 || __copy_to_user(&old_ctx->uc_sigmask,
654 ¤t->blocked, sizeof(sigset_t)))
659 if (!access_ok(VERIFY_READ, new_ctx, ctx_size)
660 || __get_user(tmp, (u8 __user *) new_ctx)
661 || __get_user(tmp, (u8 __user *) new_ctx + ctx_size - 1))
665 * If we get a fault copying the context into the kernel's
666 * image of the user's registers, we can't just return -EFAULT
667 * because the user's registers will be corrupted. For instance
668 * the NIP value may have been updated but not some of the
669 * other registers. Given that we have done the access_ok
670 * and successfully read the first and last bytes of the region
671 * above, this should only happen in an out-of-memory situation
672 * or if another thread unmaps the region containing the context.
673 * We kill the task with a SIGSEGV in this situation.
676 if (__copy_from_user(&set, &new_ctx->uc_sigmask, sizeof(set)))
678 set_current_blocked(&set);
679 if (restore_sigcontext(current, NULL, 0, &new_ctx->uc_mcontext))
682 /* This returns like rt_sigreturn */
683 set_thread_flag(TIF_RESTOREALL);
689 * Do a signal return; undo the signal stack.
692 int sys_rt_sigreturn(unsigned long r3, unsigned long r4, unsigned long r5,
693 unsigned long r6, unsigned long r7, unsigned long r8,
694 struct pt_regs *regs)
696 struct ucontext __user *uc = (struct ucontext __user *)regs->gpr[1];
698 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
702 BUG_ON(current->thread.regs != regs);
704 /* Always make any pending restarted system calls return -EINTR */
705 current->restart_block.fn = do_no_restart_syscall;
707 if (!access_ok(VERIFY_READ, uc, sizeof(*uc)))
710 if (__copy_from_user(&set, &uc->uc_sigmask, sizeof(set)))
712 set_current_blocked(&set);
714 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
716 * If there is a transactional state then throw it away.
717 * The purpose of a sigreturn is to destroy all traces of the
718 * signal frame, this includes any transactional state created
719 * within in. We only check for suspended as we can never be
720 * active in the kernel, we are active, there is nothing better to
721 * do than go ahead and Bad Thing later.
722 * The cause is not important as there will never be a
723 * recheckpoint so it's not user visible.
725 if (MSR_TM_SUSPENDED(mfmsr()))
726 tm_reclaim_current(0);
728 if (__get_user(msr, &uc->uc_mcontext.gp_regs[PT_MSR]))
730 if (MSR_TM_ACTIVE(msr)) {
731 /* We recheckpoint on return. */
732 struct ucontext __user *uc_transact;
733 if (__get_user(uc_transact, &uc->uc_link))
735 if (restore_tm_sigcontexts(current, &uc->uc_mcontext,
736 &uc_transact->uc_mcontext))
740 /* Fall through, for non-TM restore */
742 if (restore_sigcontext(current, NULL, 1, &uc->uc_mcontext))
745 if (restore_altstack(&uc->uc_stack))
748 set_thread_flag(TIF_RESTOREALL);
752 if (show_unhandled_signals)
753 printk_ratelimited(regs->msr & MSR_64BIT ? fmt64 : fmt32,
754 current->comm, current->pid, "rt_sigreturn",
755 (long)uc, regs->nip, regs->link);
757 force_sig(SIGSEGV, current);
761 int handle_rt_signal64(struct ksignal *ksig, sigset_t *set,
762 struct task_struct *tsk)
764 struct rt_sigframe __user *frame;
765 unsigned long newsp = 0;
767 struct pt_regs *regs = tsk->thread.regs;
769 BUG_ON(tsk != current);
771 frame = get_sigframe(ksig, get_tm_stackpointer(tsk), sizeof(*frame), 0);
772 if (unlikely(frame == NULL))
775 err |= __put_user(&frame->info, &frame->pinfo);
776 err |= __put_user(&frame->uc, &frame->puc);
777 err |= copy_siginfo_to_user(&frame->info, &ksig->info);
781 /* Create the ucontext. */
782 err |= __put_user(0, &frame->uc.uc_flags);
783 err |= __save_altstack(&frame->uc.uc_stack, regs->gpr[1]);
784 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
785 if (MSR_TM_ACTIVE(regs->msr)) {
786 /* The ucontext_t passed to userland points to the second
787 * ucontext_t (for transactional state) with its uc_link ptr.
789 err |= __put_user(&frame->uc_transact, &frame->uc.uc_link);
790 err |= setup_tm_sigcontexts(&frame->uc.uc_mcontext,
791 &frame->uc_transact.uc_mcontext,
792 tsk, ksig->sig, NULL,
793 (unsigned long)ksig->ka.sa.sa_handler);
797 err |= __put_user(0, &frame->uc.uc_link);
798 err |= setup_sigcontext(&frame->uc.uc_mcontext, tsk, ksig->sig,
799 NULL, (unsigned long)ksig->ka.sa.sa_handler,
802 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
806 /* Make sure signal handler doesn't get spurious FP exceptions */
807 tsk->thread.fp_state.fpscr = 0;
809 /* Set up to return from userspace. */
810 if (vdso64_rt_sigtramp && tsk->mm->context.vdso_base) {
811 regs->link = tsk->mm->context.vdso_base + vdso64_rt_sigtramp;
813 err |= setup_trampoline(__NR_rt_sigreturn, &frame->tramp[0]);
816 regs->link = (unsigned long) &frame->tramp[0];
819 /* Allocate a dummy caller frame for the signal handler. */
820 newsp = ((unsigned long)frame) - __SIGNAL_FRAMESIZE;
821 err |= put_user(regs->gpr[1], (unsigned long __user *)newsp);
823 /* Set up "regs" so we "return" to the signal handler. */
824 if (is_elf2_task()) {
825 regs->nip = (unsigned long) ksig->ka.sa.sa_handler;
826 regs->gpr[12] = regs->nip;
828 /* Handler is *really* a pointer to the function descriptor for
829 * the signal routine. The first entry in the function
830 * descriptor is the entry address of signal and the second
831 * entry is the TOC value we need to use.
833 func_descr_t __user *funct_desc_ptr =
834 (func_descr_t __user *) ksig->ka.sa.sa_handler;
836 err |= get_user(regs->nip, &funct_desc_ptr->entry);
837 err |= get_user(regs->gpr[2], &funct_desc_ptr->toc);
840 /* enter the signal handler in native-endian mode */
841 regs->msr &= ~MSR_LE;
842 regs->msr |= (MSR_KERNEL & MSR_LE);
843 regs->gpr[1] = newsp;
844 regs->gpr[3] = ksig->sig;
846 if (ksig->ka.sa.sa_flags & SA_SIGINFO) {
847 err |= get_user(regs->gpr[4], (unsigned long __user *)&frame->pinfo);
848 err |= get_user(regs->gpr[5], (unsigned long __user *)&frame->puc);
849 regs->gpr[6] = (unsigned long) frame;
851 regs->gpr[4] = (unsigned long)&frame->uc.uc_mcontext;
859 if (show_unhandled_signals)
860 printk_ratelimited(regs->msr & MSR_64BIT ? fmt64 : fmt32,
861 tsk->comm, tsk->pid, "setup_rt_frame",
862 (long)frame, regs->nip, regs->link);