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 flush_vsx_to_thread(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 flush_vsx_to_thread(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 * Force reload of FP/VEC.
354 * This has to be done before copying stuff into current->thread.fpr/vr
355 * for the reasons explained in the previous comment.
357 regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1 | MSR_VEC | MSR_VSX);
359 #ifdef CONFIG_ALTIVEC
360 err |= __get_user(v_regs, &sc->v_regs);
363 if (v_regs && !access_ok(VERIFY_READ, v_regs, 34 * sizeof(vector128)))
365 /* Copy 33 vec registers (vr0..31 and vscr) from the stack */
366 if (v_regs != NULL && (msr & MSR_VEC) != 0)
367 err |= __copy_from_user(¤t->thread.vr_state, v_regs,
368 33 * sizeof(vector128));
369 else if (current->thread.used_vr)
370 memset(¤t->thread.vr_state, 0, 33 * sizeof(vector128));
371 /* Always get VRSAVE back */
373 err |= __get_user(current->thread.vrsave, (u32 __user *)&v_regs[33]);
375 current->thread.vrsave = 0;
376 if (cpu_has_feature(CPU_FTR_ALTIVEC))
377 mtspr(SPRN_VRSAVE, current->thread.vrsave);
378 #endif /* CONFIG_ALTIVEC */
379 /* restore floating point */
380 err |= copy_fpr_from_user(current, &sc->fp_regs);
383 * Get additional VSX data. Update v_regs to point after the
384 * VMX data. Copy VSX low doubleword from userspace to local
385 * buffer for formatting, then into the taskstruct.
387 v_regs += ELF_NVRREG;
388 if ((msr & MSR_VSX) != 0)
389 err |= copy_vsx_from_user(current, v_regs);
391 for (i = 0; i < 32 ; i++)
392 current->thread.fp_state.fpr[i][TS_VSRLOWOFFSET] = 0;
397 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
399 * Restore the two sigcontexts from the frame of a transactional processes.
402 static long restore_tm_sigcontexts(struct pt_regs *regs,
403 struct sigcontext __user *sc,
404 struct sigcontext __user *tm_sc)
406 #ifdef CONFIG_ALTIVEC
407 elf_vrreg_t __user *v_regs, *tm_v_regs;
409 unsigned long err = 0;
415 err |= __copy_from_user(regs->gpr, tm_sc->gp_regs, sizeof(regs->gpr));
416 err |= __copy_from_user(¤t->thread.ckpt_regs, sc->gp_regs,
420 * TFHAR is restored from the checkpointed 'wound-back' ucontext's NIP.
421 * TEXASR was set by the signal delivery reclaim, as was TFIAR.
422 * Users doing anything abhorrent like thread-switching w/ signals for
423 * TM-Suspended code will have to back TEXASR/TFIAR up themselves.
424 * For the case of getting a signal and simply returning from it,
425 * we don't need to re-copy them here.
427 err |= __get_user(regs->nip, &tm_sc->gp_regs[PT_NIP]);
428 err |= __get_user(current->thread.tm_tfhar, &sc->gp_regs[PT_NIP]);
430 /* get MSR separately, transfer the LE bit if doing signal return */
431 err |= __get_user(msr, &sc->gp_regs[PT_MSR]);
432 /* Don't allow reserved mode. */
433 if (MSR_TM_RESV(msr))
436 /* pull in MSR TM from user context */
437 regs->msr = (regs->msr & ~MSR_TS_MASK) | (msr & MSR_TS_MASK);
439 /* pull in MSR LE from user context */
440 regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE);
442 /* The following non-GPR non-FPR non-VR state is also checkpointed: */
443 err |= __get_user(regs->ctr, &tm_sc->gp_regs[PT_CTR]);
444 err |= __get_user(regs->link, &tm_sc->gp_regs[PT_LNK]);
445 err |= __get_user(regs->xer, &tm_sc->gp_regs[PT_XER]);
446 err |= __get_user(regs->ccr, &tm_sc->gp_regs[PT_CCR]);
447 err |= __get_user(current->thread.ckpt_regs.ctr,
448 &sc->gp_regs[PT_CTR]);
449 err |= __get_user(current->thread.ckpt_regs.link,
450 &sc->gp_regs[PT_LNK]);
451 err |= __get_user(current->thread.ckpt_regs.xer,
452 &sc->gp_regs[PT_XER]);
453 err |= __get_user(current->thread.ckpt_regs.ccr,
454 &sc->gp_regs[PT_CCR]);
456 /* These regs are not checkpointed; they can go in 'regs'. */
457 err |= __get_user(regs->trap, &sc->gp_regs[PT_TRAP]);
458 err |= __get_user(regs->dar, &sc->gp_regs[PT_DAR]);
459 err |= __get_user(regs->dsisr, &sc->gp_regs[PT_DSISR]);
460 err |= __get_user(regs->result, &sc->gp_regs[PT_RESULT]);
463 * Force reload of FP/VEC.
464 * This has to be done before copying stuff into current->thread.fpr/vr
465 * for the reasons explained in the previous comment.
467 regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1 | MSR_VEC | MSR_VSX);
469 #ifdef CONFIG_ALTIVEC
470 err |= __get_user(v_regs, &sc->v_regs);
471 err |= __get_user(tm_v_regs, &tm_sc->v_regs);
474 if (v_regs && !access_ok(VERIFY_READ, v_regs, 34 * sizeof(vector128)))
476 if (tm_v_regs && !access_ok(VERIFY_READ,
477 tm_v_regs, 34 * sizeof(vector128)))
479 /* Copy 33 vec registers (vr0..31 and vscr) from the stack */
480 if (v_regs != NULL && tm_v_regs != NULL && (msr & MSR_VEC) != 0) {
481 err |= __copy_from_user(¤t->thread.vr_state, v_regs,
482 33 * sizeof(vector128));
483 err |= __copy_from_user(¤t->thread.transact_vr, tm_v_regs,
484 33 * sizeof(vector128));
486 else if (current->thread.used_vr) {
487 memset(¤t->thread.vr_state, 0, 33 * sizeof(vector128));
488 memset(¤t->thread.transact_vr, 0, 33 * sizeof(vector128));
490 /* Always get VRSAVE back */
491 if (v_regs != NULL && tm_v_regs != NULL) {
492 err |= __get_user(current->thread.vrsave,
493 (u32 __user *)&v_regs[33]);
494 err |= __get_user(current->thread.transact_vrsave,
495 (u32 __user *)&tm_v_regs[33]);
498 current->thread.vrsave = 0;
499 current->thread.transact_vrsave = 0;
501 if (cpu_has_feature(CPU_FTR_ALTIVEC))
502 mtspr(SPRN_VRSAVE, current->thread.vrsave);
503 #endif /* CONFIG_ALTIVEC */
504 /* restore floating point */
505 err |= copy_fpr_from_user(current, &sc->fp_regs);
506 err |= copy_transact_fpr_from_user(current, &tm_sc->fp_regs);
509 * Get additional VSX data. Update v_regs to point after the
510 * VMX data. Copy VSX low doubleword from userspace to local
511 * buffer for formatting, then into the taskstruct.
513 if (v_regs && ((msr & MSR_VSX) != 0)) {
514 v_regs += ELF_NVRREG;
515 tm_v_regs += ELF_NVRREG;
516 err |= copy_vsx_from_user(current, v_regs);
517 err |= copy_transact_vsx_from_user(current, tm_v_regs);
519 for (i = 0; i < 32 ; i++) {
520 current->thread.fp_state.fpr[i][TS_VSRLOWOFFSET] = 0;
521 current->thread.transact_fp.fpr[i][TS_VSRLOWOFFSET] = 0;
526 /* Make sure the transaction is marked as failed */
527 current->thread.tm_texasr |= TEXASR_FS;
528 /* This loads the checkpointed FP/VEC state, if used */
529 tm_recheckpoint(¤t->thread, msr);
531 /* This loads the speculative FP/VEC state, if used */
533 do_load_up_transact_fpu(¤t->thread);
534 regs->msr |= (MSR_FP | current->thread.fpexc_mode);
536 #ifdef CONFIG_ALTIVEC
538 do_load_up_transact_altivec(¤t->thread);
539 regs->msr |= MSR_VEC;
548 * Setup the trampoline code on the stack
550 static long setup_trampoline(unsigned int syscall, unsigned int __user *tramp)
555 /* addi r1, r1, __SIGNAL_FRAMESIZE # Pop the dummy stackframe */
556 err |= __put_user(0x38210000UL | (__SIGNAL_FRAMESIZE & 0xffff), &tramp[0]);
557 /* li r0, __NR_[rt_]sigreturn| */
558 err |= __put_user(0x38000000UL | (syscall & 0xffff), &tramp[1]);
560 err |= __put_user(0x44000002UL, &tramp[2]);
562 /* Minimal traceback info */
563 for (i=TRAMP_TRACEBACK; i < TRAMP_SIZE ;i++)
564 err |= __put_user(0, &tramp[i]);
567 flush_icache_range((unsigned long) &tramp[0],
568 (unsigned long) &tramp[TRAMP_SIZE]);
574 * Userspace code may pass a ucontext which doesn't include VSX added
575 * at the end. We need to check for this case.
577 #define UCONTEXTSIZEWITHOUTVSX \
578 (sizeof(struct ucontext) - 32*sizeof(long))
581 * Handle {get,set,swap}_context operations
583 int sys_swapcontext(struct ucontext __user *old_ctx,
584 struct ucontext __user *new_ctx,
585 long ctx_size, long r6, long r7, long r8, struct pt_regs *regs)
589 unsigned long new_msr = 0;
590 int ctx_has_vsx_region = 0;
593 get_user(new_msr, &new_ctx->uc_mcontext.gp_regs[PT_MSR]))
596 * Check that the context is not smaller than the original
597 * size (with VMX but without VSX)
599 if (ctx_size < UCONTEXTSIZEWITHOUTVSX)
602 * If the new context state sets the MSR VSX bits but
603 * it doesn't provide VSX state.
605 if ((ctx_size < sizeof(struct ucontext)) &&
608 /* Does the context have enough room to store VSX data? */
609 if (ctx_size >= sizeof(struct ucontext))
610 ctx_has_vsx_region = 1;
612 if (old_ctx != NULL) {
613 if (!access_ok(VERIFY_WRITE, old_ctx, ctx_size)
614 || setup_sigcontext(&old_ctx->uc_mcontext, regs, 0, NULL, 0,
616 || __copy_to_user(&old_ctx->uc_sigmask,
617 ¤t->blocked, sizeof(sigset_t)))
622 if (!access_ok(VERIFY_READ, new_ctx, ctx_size)
623 || __get_user(tmp, (u8 __user *) new_ctx)
624 || __get_user(tmp, (u8 __user *) new_ctx + ctx_size - 1))
628 * If we get a fault copying the context into the kernel's
629 * image of the user's registers, we can't just return -EFAULT
630 * because the user's registers will be corrupted. For instance
631 * the NIP value may have been updated but not some of the
632 * other registers. Given that we have done the access_ok
633 * and successfully read the first and last bytes of the region
634 * above, this should only happen in an out-of-memory situation
635 * or if another thread unmaps the region containing the context.
636 * We kill the task with a SIGSEGV in this situation.
639 if (__copy_from_user(&set, &new_ctx->uc_sigmask, sizeof(set)))
641 set_current_blocked(&set);
642 if (restore_sigcontext(regs, NULL, 0, &new_ctx->uc_mcontext))
645 /* This returns like rt_sigreturn */
646 set_thread_flag(TIF_RESTOREALL);
652 * Do a signal return; undo the signal stack.
655 int sys_rt_sigreturn(unsigned long r3, unsigned long r4, unsigned long r5,
656 unsigned long r6, unsigned long r7, unsigned long r8,
657 struct pt_regs *regs)
659 struct ucontext __user *uc = (struct ucontext __user *)regs->gpr[1];
661 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
665 /* Always make any pending restarted system calls return -EINTR */
666 current->restart_block.fn = do_no_restart_syscall;
668 if (!access_ok(VERIFY_READ, uc, sizeof(*uc)))
671 if (__copy_from_user(&set, &uc->uc_sigmask, sizeof(set)))
673 set_current_blocked(&set);
674 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
675 if (__get_user(msr, &uc->uc_mcontext.gp_regs[PT_MSR]))
677 if (MSR_TM_ACTIVE(msr)) {
678 /* We recheckpoint on return. */
679 struct ucontext __user *uc_transact;
680 if (__get_user(uc_transact, &uc->uc_link))
682 if (restore_tm_sigcontexts(regs, &uc->uc_mcontext,
683 &uc_transact->uc_mcontext))
687 /* Fall through, for non-TM restore */
689 if (restore_sigcontext(regs, NULL, 1, &uc->uc_mcontext))
692 if (restore_altstack(&uc->uc_stack))
695 set_thread_flag(TIF_RESTOREALL);
699 if (show_unhandled_signals)
700 printk_ratelimited(regs->msr & MSR_64BIT ? fmt64 : fmt32,
701 current->comm, current->pid, "rt_sigreturn",
702 (long)uc, regs->nip, regs->link);
704 force_sig(SIGSEGV, current);
708 int handle_rt_signal64(struct ksignal *ksig, sigset_t *set, struct pt_regs *regs)
710 struct rt_sigframe __user *frame;
711 unsigned long newsp = 0;
714 frame = get_sigframe(ksig, get_tm_stackpointer(regs), sizeof(*frame), 0);
715 if (unlikely(frame == NULL))
718 err |= __put_user(&frame->info, &frame->pinfo);
719 err |= __put_user(&frame->uc, &frame->puc);
720 err |= copy_siginfo_to_user(&frame->info, &ksig->info);
724 /* Create the ucontext. */
725 err |= __put_user(0, &frame->uc.uc_flags);
726 err |= __save_altstack(&frame->uc.uc_stack, regs->gpr[1]);
727 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
728 if (MSR_TM_ACTIVE(regs->msr)) {
729 /* The ucontext_t passed to userland points to the second
730 * ucontext_t (for transactional state) with its uc_link ptr.
732 err |= __put_user(&frame->uc_transact, &frame->uc.uc_link);
733 err |= setup_tm_sigcontexts(&frame->uc.uc_mcontext,
734 &frame->uc_transact.uc_mcontext,
737 (unsigned long)ksig->ka.sa.sa_handler);
741 err |= __put_user(0, &frame->uc.uc_link);
742 err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, ksig->sig,
743 NULL, (unsigned long)ksig->ka.sa.sa_handler,
746 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
750 /* Make sure signal handler doesn't get spurious FP exceptions */
751 current->thread.fp_state.fpscr = 0;
753 /* Set up to return from userspace. */
754 if (vdso64_rt_sigtramp && current->mm->context.vdso_base) {
755 regs->link = current->mm->context.vdso_base + vdso64_rt_sigtramp;
757 err |= setup_trampoline(__NR_rt_sigreturn, &frame->tramp[0]);
760 regs->link = (unsigned long) &frame->tramp[0];
763 /* Allocate a dummy caller frame for the signal handler. */
764 newsp = ((unsigned long)frame) - __SIGNAL_FRAMESIZE;
765 err |= put_user(regs->gpr[1], (unsigned long __user *)newsp);
767 /* Set up "regs" so we "return" to the signal handler. */
768 if (is_elf2_task()) {
769 regs->nip = (unsigned long) ksig->ka.sa.sa_handler;
770 regs->gpr[12] = regs->nip;
772 /* Handler is *really* a pointer to the function descriptor for
773 * the signal routine. The first entry in the function
774 * descriptor is the entry address of signal and the second
775 * entry is the TOC value we need to use.
777 func_descr_t __user *funct_desc_ptr =
778 (func_descr_t __user *) ksig->ka.sa.sa_handler;
780 err |= get_user(regs->nip, &funct_desc_ptr->entry);
781 err |= get_user(regs->gpr[2], &funct_desc_ptr->toc);
784 /* enter the signal handler in native-endian mode */
785 regs->msr &= ~MSR_LE;
786 regs->msr |= (MSR_KERNEL & MSR_LE);
787 regs->gpr[1] = newsp;
788 regs->gpr[3] = ksig->sig;
790 if (ksig->ka.sa.sa_flags & SA_SIGINFO) {
791 err |= get_user(regs->gpr[4], (unsigned long __user *)&frame->pinfo);
792 err |= get_user(regs->gpr[5], (unsigned long __user *)&frame->puc);
793 regs->gpr[6] = (unsigned long) frame;
795 regs->gpr[4] = (unsigned long)&frame->uc.uc_mcontext;
803 if (show_unhandled_signals)
804 printk_ratelimited(regs->msr & MSR_64BIT ? fmt64 : fmt32,
805 current->comm, current->pid, "setup_rt_frame",
806 (long)frame, regs->nip, regs->link);