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>
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 /* 64 bit ABI allows for 288 bytes below sp before decrementing it. */
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 * Set up the sigcontext for the signal frame.
81 static long setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
82 int signr, sigset_t *set, unsigned long handler,
83 int ctx_has_vsx_region)
85 /* When CONFIG_ALTIVEC is set, we _always_ setup v_regs even if the
86 * process never used altivec yet (MSR_VEC is zero in pt_regs of
87 * the context). This is very important because we must ensure we
88 * don't lose the VRSAVE content that may have been set prior to
89 * the process doing its first vector operation
90 * Userland shall check AT_HWCAP to know whether it can rely on the
91 * v_regs pointer or not
94 elf_vrreg_t __user *v_regs = (elf_vrreg_t __user *)(((unsigned long)sc->vmx_reserve + 15) & ~0xful);
96 unsigned long msr = regs->msr;
100 err |= __put_user(v_regs, &sc->v_regs);
102 /* save altivec registers */
103 if (current->thread.used_vr) {
104 flush_altivec_to_thread(current);
105 /* Copy 33 vec registers (vr0..31 and vscr) to the stack */
106 err |= __copy_to_user(v_regs, ¤t->thread.vr_state,
107 33 * sizeof(vector128));
108 /* set MSR_VEC in the MSR value in the frame to indicate that sc->v_reg)
109 * contains valid data.
113 /* We always copy to/from vrsave, it's 0 if we don't have or don't
116 if (cpu_has_feature(CPU_FTR_ALTIVEC))
117 current->thread.vrsave = mfspr(SPRN_VRSAVE);
118 err |= __put_user(current->thread.vrsave, (u32 __user *)&v_regs[33]);
119 #else /* CONFIG_ALTIVEC */
120 err |= __put_user(0, &sc->v_regs);
121 #endif /* CONFIG_ALTIVEC */
122 flush_fp_to_thread(current);
123 /* copy fpr regs and fpscr */
124 err |= copy_fpr_to_user(&sc->fp_regs, current);
127 * Clear the MSR VSX bit to indicate there is no valid state attached
128 * to this context, except in the specific case below where we set it.
133 * Copy VSX low doubleword to local buffer for formatting,
134 * then out to userspace. Update v_regs to point after the
137 if (current->thread.used_vsr && ctx_has_vsx_region) {
138 __giveup_vsx(current);
139 v_regs += ELF_NVRREG;
140 err |= copy_vsx_to_user(v_regs, current);
141 /* set MSR_VSX in the MSR value in the frame to
142 * indicate that sc->vs_reg) contains valid data.
146 #endif /* CONFIG_VSX */
147 err |= __put_user(&sc->gp_regs, &sc->regs);
148 WARN_ON(!FULL_REGS(regs));
149 err |= __copy_to_user(&sc->gp_regs, regs, GP_REGS_SIZE);
150 err |= __put_user(msr, &sc->gp_regs[PT_MSR]);
151 err |= __put_user(signr, &sc->signal);
152 err |= __put_user(handler, &sc->handler);
154 err |= __put_user(set->sig[0], &sc->oldmask);
159 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
161 * As above, but Transactional Memory is in use, so deliver sigcontexts
162 * containing checkpointed and transactional register states.
164 * To do this, we treclaim (done before entering here) to gather both sets of
165 * registers and set up the 'normal' sigcontext registers with rolled-back
166 * register values such that a simple signal handler sees a correct
167 * checkpointed register state. If interested, a TM-aware sighandler can
168 * examine the transactional registers in the 2nd sigcontext to determine the
169 * real origin of the signal.
171 static long setup_tm_sigcontexts(struct sigcontext __user *sc,
172 struct sigcontext __user *tm_sc,
173 struct pt_regs *regs,
174 int signr, sigset_t *set, unsigned long handler)
176 /* When CONFIG_ALTIVEC is set, we _always_ setup v_regs even if the
177 * process never used altivec yet (MSR_VEC is zero in pt_regs of
178 * the context). This is very important because we must ensure we
179 * don't lose the VRSAVE content that may have been set prior to
180 * the process doing its first vector operation
181 * Userland shall check AT_HWCAP to know wether it can rely on the
182 * v_regs pointer or not.
184 #ifdef CONFIG_ALTIVEC
185 elf_vrreg_t __user *v_regs = (elf_vrreg_t __user *)
186 (((unsigned long)sc->vmx_reserve + 15) & ~0xful);
187 elf_vrreg_t __user *tm_v_regs = (elf_vrreg_t __user *)
188 (((unsigned long)tm_sc->vmx_reserve + 15) & ~0xful);
190 unsigned long msr = regs->msr;
193 BUG_ON(!MSR_TM_ACTIVE(regs->msr));
195 /* Remove TM bits from thread's MSR. The MSR in the sigcontext
196 * just indicates to userland that we were doing a transaction, but we
197 * don't want to return in transactional state. This also ensures
198 * that flush_fp_to_thread won't set TIF_RESTORE_TM again.
200 regs->msr &= ~MSR_TS_MASK;
202 flush_fp_to_thread(current);
204 #ifdef CONFIG_ALTIVEC
205 err |= __put_user(v_regs, &sc->v_regs);
206 err |= __put_user(tm_v_regs, &tm_sc->v_regs);
208 /* save altivec registers */
209 if (current->thread.used_vr) {
210 flush_altivec_to_thread(current);
211 /* Copy 33 vec registers (vr0..31 and vscr) to the stack */
212 err |= __copy_to_user(v_regs, ¤t->thread.vr_state,
213 33 * sizeof(vector128));
214 /* If VEC was enabled there are transactional VRs valid too,
215 * else they're a copy of the checkpointed VRs.
218 err |= __copy_to_user(tm_v_regs,
219 ¤t->thread.transact_vr,
220 33 * sizeof(vector128));
222 err |= __copy_to_user(tm_v_regs,
223 ¤t->thread.vr_state,
224 33 * sizeof(vector128));
226 /* set MSR_VEC in the MSR value in the frame to indicate
227 * that sc->v_reg contains valid data.
231 /* We always copy to/from vrsave, it's 0 if we don't have or don't
234 if (cpu_has_feature(CPU_FTR_ALTIVEC))
235 current->thread.vrsave = mfspr(SPRN_VRSAVE);
236 err |= __put_user(current->thread.vrsave, (u32 __user *)&v_regs[33]);
238 err |= __put_user(current->thread.transact_vrsave,
239 (u32 __user *)&tm_v_regs[33]);
241 err |= __put_user(current->thread.vrsave,
242 (u32 __user *)&tm_v_regs[33]);
244 #else /* CONFIG_ALTIVEC */
245 err |= __put_user(0, &sc->v_regs);
246 err |= __put_user(0, &tm_sc->v_regs);
247 #endif /* CONFIG_ALTIVEC */
249 /* copy fpr regs and fpscr */
250 err |= copy_fpr_to_user(&sc->fp_regs, current);
252 err |= copy_transact_fpr_to_user(&tm_sc->fp_regs, current);
254 err |= copy_fpr_to_user(&tm_sc->fp_regs, current);
258 * Copy VSX low doubleword to local buffer for formatting,
259 * then out to userspace. Update v_regs to point after the
262 if (current->thread.used_vsr) {
263 __giveup_vsx(current);
264 v_regs += ELF_NVRREG;
265 tm_v_regs += ELF_NVRREG;
267 err |= copy_vsx_to_user(v_regs, current);
270 err |= copy_transact_vsx_to_user(tm_v_regs, current);
272 err |= copy_vsx_to_user(tm_v_regs, current);
274 /* set MSR_VSX in the MSR value in the frame to
275 * indicate that sc->vs_reg) contains valid data.
279 #endif /* CONFIG_VSX */
281 err |= __put_user(&sc->gp_regs, &sc->regs);
282 err |= __put_user(&tm_sc->gp_regs, &tm_sc->regs);
283 WARN_ON(!FULL_REGS(regs));
284 err |= __copy_to_user(&tm_sc->gp_regs, regs, GP_REGS_SIZE);
285 err |= __copy_to_user(&sc->gp_regs,
286 ¤t->thread.ckpt_regs, GP_REGS_SIZE);
287 err |= __put_user(msr, &tm_sc->gp_regs[PT_MSR]);
288 err |= __put_user(msr, &sc->gp_regs[PT_MSR]);
289 err |= __put_user(signr, &sc->signal);
290 err |= __put_user(handler, &sc->handler);
292 err |= __put_user(set->sig[0], &sc->oldmask);
299 * Restore the sigcontext from the signal frame.
302 static long restore_sigcontext(struct pt_regs *regs, sigset_t *set, int sig,
303 struct sigcontext __user *sc)
305 #ifdef CONFIG_ALTIVEC
306 elf_vrreg_t __user *v_regs;
308 unsigned long err = 0;
309 unsigned long save_r13 = 0;
315 /* If this is not a signal return, we preserve the TLS in r13 */
317 save_r13 = regs->gpr[13];
320 err |= __copy_from_user(regs->gpr, sc->gp_regs, sizeof(regs->gpr));
321 err |= __get_user(regs->nip, &sc->gp_regs[PT_NIP]);
322 /* get MSR separately, transfer the LE bit if doing signal return */
323 err |= __get_user(msr, &sc->gp_regs[PT_MSR]);
325 regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE);
326 err |= __get_user(regs->orig_gpr3, &sc->gp_regs[PT_ORIG_R3]);
327 err |= __get_user(regs->ctr, &sc->gp_regs[PT_CTR]);
328 err |= __get_user(regs->link, &sc->gp_regs[PT_LNK]);
329 err |= __get_user(regs->xer, &sc->gp_regs[PT_XER]);
330 err |= __get_user(regs->ccr, &sc->gp_regs[PT_CCR]);
333 err |= __get_user(regs->dar, &sc->gp_regs[PT_DAR]);
334 err |= __get_user(regs->dsisr, &sc->gp_regs[PT_DSISR]);
335 err |= __get_user(regs->result, &sc->gp_regs[PT_RESULT]);
338 regs->gpr[13] = save_r13;
340 err |= __get_user(set->sig[0], &sc->oldmask);
343 * Do this before updating the thread state in
344 * current->thread.fpr/vr. That way, if we get preempted
345 * and another task grabs the FPU/Altivec, it won't be
346 * tempted to save the current CPU state into the thread_struct
347 * and corrupt what we are writing there.
349 discard_lazy_cpu_state();
352 * Force reload of FP/VEC.
353 * This has to be done before copying stuff into current->thread.fpr/vr
354 * for the reasons explained in the previous comment.
356 regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1 | MSR_VEC | MSR_VSX);
358 #ifdef CONFIG_ALTIVEC
359 err |= __get_user(v_regs, &sc->v_regs);
362 if (v_regs && !access_ok(VERIFY_READ, v_regs, 34 * sizeof(vector128)))
364 /* Copy 33 vec registers (vr0..31 and vscr) from the stack */
365 if (v_regs != NULL && (msr & MSR_VEC) != 0)
366 err |= __copy_from_user(¤t->thread.vr_state, v_regs,
367 33 * sizeof(vector128));
368 else if (current->thread.used_vr)
369 memset(¤t->thread.vr_state, 0, 33 * sizeof(vector128));
370 /* Always get VRSAVE back */
372 err |= __get_user(current->thread.vrsave, (u32 __user *)&v_regs[33]);
374 current->thread.vrsave = 0;
375 if (cpu_has_feature(CPU_FTR_ALTIVEC))
376 mtspr(SPRN_VRSAVE, current->thread.vrsave);
377 #endif /* CONFIG_ALTIVEC */
378 /* restore floating point */
379 err |= copy_fpr_from_user(current, &sc->fp_regs);
382 * Get additional VSX data. Update v_regs to point after the
383 * VMX data. Copy VSX low doubleword from userspace to local
384 * buffer for formatting, then into the taskstruct.
386 v_regs += ELF_NVRREG;
387 if ((msr & MSR_VSX) != 0)
388 err |= copy_vsx_from_user(current, v_regs);
390 for (i = 0; i < 32 ; i++)
391 current->thread.fp_state.fpr[i][TS_VSRLOWOFFSET] = 0;
396 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
398 * Restore the two sigcontexts from the frame of a transactional processes.
401 static long restore_tm_sigcontexts(struct pt_regs *regs,
402 struct sigcontext __user *sc,
403 struct sigcontext __user *tm_sc)
405 #ifdef CONFIG_ALTIVEC
406 elf_vrreg_t __user *v_regs, *tm_v_regs;
408 unsigned long err = 0;
414 err |= __copy_from_user(regs->gpr, tm_sc->gp_regs, sizeof(regs->gpr));
415 err |= __copy_from_user(¤t->thread.ckpt_regs, sc->gp_regs,
419 * TFHAR is restored from the checkpointed 'wound-back' ucontext's NIP.
420 * TEXASR was set by the signal delivery reclaim, as was TFIAR.
421 * Users doing anything abhorrent like thread-switching w/ signals for
422 * TM-Suspended code will have to back TEXASR/TFIAR up themselves.
423 * For the case of getting a signal and simply returning from it,
424 * we don't need to re-copy them here.
426 err |= __get_user(regs->nip, &tm_sc->gp_regs[PT_NIP]);
427 err |= __get_user(current->thread.tm_tfhar, &sc->gp_regs[PT_NIP]);
429 /* get MSR separately, transfer the LE bit if doing signal return */
430 err |= __get_user(msr, &sc->gp_regs[PT_MSR]);
431 /* pull in MSR TM from user context */
432 regs->msr = (regs->msr & ~MSR_TS_MASK) | (msr & MSR_TS_MASK);
434 /* pull in MSR LE from user context */
435 regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE);
437 /* The following non-GPR non-FPR non-VR state is also checkpointed: */
438 err |= __get_user(regs->ctr, &tm_sc->gp_regs[PT_CTR]);
439 err |= __get_user(regs->link, &tm_sc->gp_regs[PT_LNK]);
440 err |= __get_user(regs->xer, &tm_sc->gp_regs[PT_XER]);
441 err |= __get_user(regs->ccr, &tm_sc->gp_regs[PT_CCR]);
442 err |= __get_user(current->thread.ckpt_regs.ctr,
443 &sc->gp_regs[PT_CTR]);
444 err |= __get_user(current->thread.ckpt_regs.link,
445 &sc->gp_regs[PT_LNK]);
446 err |= __get_user(current->thread.ckpt_regs.xer,
447 &sc->gp_regs[PT_XER]);
448 err |= __get_user(current->thread.ckpt_regs.ccr,
449 &sc->gp_regs[PT_CCR]);
451 /* These regs are not checkpointed; they can go in 'regs'. */
452 err |= __get_user(regs->trap, &sc->gp_regs[PT_TRAP]);
453 err |= __get_user(regs->dar, &sc->gp_regs[PT_DAR]);
454 err |= __get_user(regs->dsisr, &sc->gp_regs[PT_DSISR]);
455 err |= __get_user(regs->result, &sc->gp_regs[PT_RESULT]);
458 * Do this before updating the thread state in
459 * current->thread.fpr/vr. That way, if we get preempted
460 * and another task grabs the FPU/Altivec, it won't be
461 * tempted to save the current CPU state into the thread_struct
462 * and corrupt what we are writing there.
464 discard_lazy_cpu_state();
467 * Force reload of FP/VEC.
468 * This has to be done before copying stuff into current->thread.fpr/vr
469 * for the reasons explained in the previous comment.
471 regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1 | MSR_VEC | MSR_VSX);
473 #ifdef CONFIG_ALTIVEC
474 err |= __get_user(v_regs, &sc->v_regs);
475 err |= __get_user(tm_v_regs, &tm_sc->v_regs);
478 if (v_regs && !access_ok(VERIFY_READ, v_regs, 34 * sizeof(vector128)))
480 if (tm_v_regs && !access_ok(VERIFY_READ,
481 tm_v_regs, 34 * sizeof(vector128)))
483 /* Copy 33 vec registers (vr0..31 and vscr) from the stack */
484 if (v_regs != NULL && tm_v_regs != NULL && (msr & MSR_VEC) != 0) {
485 err |= __copy_from_user(¤t->thread.vr_state, v_regs,
486 33 * sizeof(vector128));
487 err |= __copy_from_user(¤t->thread.transact_vr, tm_v_regs,
488 33 * sizeof(vector128));
490 else if (current->thread.used_vr) {
491 memset(¤t->thread.vr_state, 0, 33 * sizeof(vector128));
492 memset(¤t->thread.transact_vr, 0, 33 * sizeof(vector128));
494 /* Always get VRSAVE back */
495 if (v_regs != NULL && tm_v_regs != NULL) {
496 err |= __get_user(current->thread.vrsave,
497 (u32 __user *)&v_regs[33]);
498 err |= __get_user(current->thread.transact_vrsave,
499 (u32 __user *)&tm_v_regs[33]);
502 current->thread.vrsave = 0;
503 current->thread.transact_vrsave = 0;
505 if (cpu_has_feature(CPU_FTR_ALTIVEC))
506 mtspr(SPRN_VRSAVE, current->thread.vrsave);
507 #endif /* CONFIG_ALTIVEC */
508 /* restore floating point */
509 err |= copy_fpr_from_user(current, &sc->fp_regs);
510 err |= copy_transact_fpr_from_user(current, &tm_sc->fp_regs);
513 * Get additional VSX data. Update v_regs to point after the
514 * VMX data. Copy VSX low doubleword from userspace to local
515 * buffer for formatting, then into the taskstruct.
517 if (v_regs && ((msr & MSR_VSX) != 0)) {
518 v_regs += ELF_NVRREG;
519 tm_v_regs += ELF_NVRREG;
520 err |= copy_vsx_from_user(current, v_regs);
521 err |= copy_transact_vsx_from_user(current, tm_v_regs);
523 for (i = 0; i < 32 ; i++) {
524 current->thread.fp_state.fpr[i][TS_VSRLOWOFFSET] = 0;
525 current->thread.transact_fp.fpr[i][TS_VSRLOWOFFSET] = 0;
530 /* This loads the checkpointed FP/VEC state, if used */
531 tm_recheckpoint(¤t->thread, msr);
533 /* This loads the speculative FP/VEC state, if used */
535 do_load_up_transact_fpu(¤t->thread);
536 regs->msr |= (MSR_FP | current->thread.fpexc_mode);
538 #ifdef CONFIG_ALTIVEC
540 do_load_up_transact_altivec(¤t->thread);
541 regs->msr |= MSR_VEC;
550 * Setup the trampoline code on the stack
552 static long setup_trampoline(unsigned int syscall, unsigned int __user *tramp)
557 /* addi r1, r1, __SIGNAL_FRAMESIZE # Pop the dummy stackframe */
558 err |= __put_user(0x38210000UL | (__SIGNAL_FRAMESIZE & 0xffff), &tramp[0]);
559 /* li r0, __NR_[rt_]sigreturn| */
560 err |= __put_user(0x38000000UL | (syscall & 0xffff), &tramp[1]);
562 err |= __put_user(0x44000002UL, &tramp[2]);
564 /* Minimal traceback info */
565 for (i=TRAMP_TRACEBACK; i < TRAMP_SIZE ;i++)
566 err |= __put_user(0, &tramp[i]);
569 flush_icache_range((unsigned long) &tramp[0],
570 (unsigned long) &tramp[TRAMP_SIZE]);
576 * Userspace code may pass a ucontext which doesn't include VSX added
577 * at the end. We need to check for this case.
579 #define UCONTEXTSIZEWITHOUTVSX \
580 (sizeof(struct ucontext) - 32*sizeof(long))
583 * Handle {get,set,swap}_context operations
585 int sys_swapcontext(struct ucontext __user *old_ctx,
586 struct ucontext __user *new_ctx,
587 long ctx_size, long r6, long r7, long r8, struct pt_regs *regs)
591 unsigned long new_msr = 0;
592 int ctx_has_vsx_region = 0;
595 get_user(new_msr, &new_ctx->uc_mcontext.gp_regs[PT_MSR]))
598 * Check that the context is not smaller than the original
599 * size (with VMX but without VSX)
601 if (ctx_size < UCONTEXTSIZEWITHOUTVSX)
604 * If the new context state sets the MSR VSX bits but
605 * it doesn't provide VSX state.
607 if ((ctx_size < sizeof(struct ucontext)) &&
610 /* Does the context have enough room to store VSX data? */
611 if (ctx_size >= sizeof(struct ucontext))
612 ctx_has_vsx_region = 1;
614 if (old_ctx != NULL) {
615 if (!access_ok(VERIFY_WRITE, old_ctx, ctx_size)
616 || setup_sigcontext(&old_ctx->uc_mcontext, regs, 0, NULL, 0,
618 || __copy_to_user(&old_ctx->uc_sigmask,
619 ¤t->blocked, sizeof(sigset_t)))
624 if (!access_ok(VERIFY_READ, new_ctx, ctx_size)
625 || __get_user(tmp, (u8 __user *) new_ctx)
626 || __get_user(tmp, (u8 __user *) new_ctx + ctx_size - 1))
630 * If we get a fault copying the context into the kernel's
631 * image of the user's registers, we can't just return -EFAULT
632 * because the user's registers will be corrupted. For instance
633 * the NIP value may have been updated but not some of the
634 * other registers. Given that we have done the access_ok
635 * and successfully read the first and last bytes of the region
636 * above, this should only happen in an out-of-memory situation
637 * or if another thread unmaps the region containing the context.
638 * We kill the task with a SIGSEGV in this situation.
641 if (__copy_from_user(&set, &new_ctx->uc_sigmask, sizeof(set)))
643 set_current_blocked(&set);
644 if (restore_sigcontext(regs, NULL, 0, &new_ctx->uc_mcontext))
647 /* This returns like rt_sigreturn */
648 set_thread_flag(TIF_RESTOREALL);
654 * Do a signal return; undo the signal stack.
657 int sys_rt_sigreturn(unsigned long r3, unsigned long r4, unsigned long r5,
658 unsigned long r6, unsigned long r7, unsigned long r8,
659 struct pt_regs *regs)
661 struct ucontext __user *uc = (struct ucontext __user *)regs->gpr[1];
663 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
667 /* Always make any pending restarted system calls return -EINTR */
668 current_thread_info()->restart_block.fn = do_no_restart_syscall;
670 if (!access_ok(VERIFY_READ, uc, sizeof(*uc)))
673 if (__copy_from_user(&set, &uc->uc_sigmask, sizeof(set)))
675 set_current_blocked(&set);
676 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
677 if (__get_user(msr, &uc->uc_mcontext.gp_regs[PT_MSR]))
679 if (MSR_TM_ACTIVE(msr)) {
680 /* We recheckpoint on return. */
681 struct ucontext __user *uc_transact;
682 if (__get_user(uc_transact, &uc->uc_link))
684 if (restore_tm_sigcontexts(regs, &uc->uc_mcontext,
685 &uc_transact->uc_mcontext))
689 /* Fall through, for non-TM restore */
691 if (restore_sigcontext(regs, NULL, 1, &uc->uc_mcontext))
694 if (restore_altstack(&uc->uc_stack))
697 set_thread_flag(TIF_RESTOREALL);
702 printk("badframe in sys_rt_sigreturn, regs=%p uc=%p &uc->uc_mcontext=%p\n",
703 regs, uc, &uc->uc_mcontext);
705 if (show_unhandled_signals)
706 printk_ratelimited(regs->msr & MSR_64BIT ? fmt64 : fmt32,
707 current->comm, current->pid, "rt_sigreturn",
708 (long)uc, regs->nip, regs->link);
710 force_sig(SIGSEGV, current);
714 int handle_rt_signal64(int signr, struct k_sigaction *ka, siginfo_t *info,
715 sigset_t *set, struct pt_regs *regs)
717 struct rt_sigframe __user *frame;
718 unsigned long newsp = 0;
721 frame = get_sigframe(ka, get_tm_stackpointer(regs), sizeof(*frame), 0);
722 if (unlikely(frame == NULL))
725 err |= __put_user(&frame->info, &frame->pinfo);
726 err |= __put_user(&frame->uc, &frame->puc);
727 err |= copy_siginfo_to_user(&frame->info, info);
731 /* Create the ucontext. */
732 err |= __put_user(0, &frame->uc.uc_flags);
733 err |= __save_altstack(&frame->uc.uc_stack, regs->gpr[1]);
734 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
735 if (MSR_TM_ACTIVE(regs->msr)) {
736 /* The ucontext_t passed to userland points to the second
737 * ucontext_t (for transactional state) with its uc_link ptr.
739 err |= __put_user(&frame->uc_transact, &frame->uc.uc_link);
740 err |= setup_tm_sigcontexts(&frame->uc.uc_mcontext,
741 &frame->uc_transact.uc_mcontext,
744 (unsigned long)ka->sa.sa_handler);
748 err |= __put_user(0, &frame->uc.uc_link);
749 err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, signr,
750 NULL, (unsigned long)ka->sa.sa_handler,
753 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
757 /* Make sure signal handler doesn't get spurious FP exceptions */
758 current->thread.fp_state.fpscr = 0;
760 /* Set up to return from userspace. */
761 if (vdso64_rt_sigtramp && current->mm->context.vdso_base) {
762 regs->link = current->mm->context.vdso_base + vdso64_rt_sigtramp;
764 err |= setup_trampoline(__NR_rt_sigreturn, &frame->tramp[0]);
767 regs->link = (unsigned long) &frame->tramp[0];
770 /* Allocate a dummy caller frame for the signal handler. */
771 newsp = ((unsigned long)frame) - __SIGNAL_FRAMESIZE;
772 err |= put_user(regs->gpr[1], (unsigned long __user *)newsp);
774 /* Set up "regs" so we "return" to the signal handler. */
775 if (is_elf2_task()) {
776 regs->nip = (unsigned long) ka->sa.sa_handler;
777 regs->gpr[12] = regs->nip;
779 /* Handler is *really* a pointer to the function descriptor for
780 * the signal routine. The first entry in the function
781 * descriptor is the entry address of signal and the second
782 * entry is the TOC value we need to use.
784 func_descr_t __user *funct_desc_ptr =
785 (func_descr_t __user *) ka->sa.sa_handler;
787 err |= get_user(regs->nip, &funct_desc_ptr->entry);
788 err |= get_user(regs->gpr[2], &funct_desc_ptr->toc);
791 /* enter the signal handler in native-endian mode */
792 regs->msr &= ~MSR_LE;
793 regs->msr |= (MSR_KERNEL & MSR_LE);
794 regs->gpr[1] = newsp;
795 regs->gpr[3] = signr;
797 if (ka->sa.sa_flags & SA_SIGINFO) {
798 err |= get_user(regs->gpr[4], (unsigned long __user *)&frame->pinfo);
799 err |= get_user(regs->gpr[5], (unsigned long __user *)&frame->puc);
800 regs->gpr[6] = (unsigned long) frame;
802 regs->gpr[4] = (unsigned long)&frame->uc.uc_mcontext;
811 printk("badframe in setup_rt_frame, regs=%p frame=%p newsp=%lx\n",
814 if (show_unhandled_signals)
815 printk_ratelimited(regs->msr & MSR_64BIT ? fmt64 : fmt32,
816 current->comm, current->pid, "setup_rt_frame",
817 (long)frame, regs->nip, regs->link);
819 force_sigsegv(signr, current);