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 * Copy VSX low doubleword to local buffer for formatting,
128 * then out to userspace. Update v_regs to point after the
131 if (current->thread.used_vsr && ctx_has_vsx_region) {
132 __giveup_vsx(current);
133 v_regs += ELF_NVRREG;
134 err |= copy_vsx_to_user(v_regs, current);
135 /* set MSR_VSX in the MSR value in the frame to
136 * indicate that sc->vs_reg) contains valid data.
140 #endif /* CONFIG_VSX */
141 err |= __put_user(&sc->gp_regs, &sc->regs);
142 WARN_ON(!FULL_REGS(regs));
143 err |= __copy_to_user(&sc->gp_regs, regs, GP_REGS_SIZE);
144 err |= __put_user(msr, &sc->gp_regs[PT_MSR]);
145 err |= __put_user(signr, &sc->signal);
146 err |= __put_user(handler, &sc->handler);
148 err |= __put_user(set->sig[0], &sc->oldmask);
153 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
155 * As above, but Transactional Memory is in use, so deliver sigcontexts
156 * containing checkpointed and transactional register states.
158 * To do this, we treclaim (done before entering here) to gather both sets of
159 * registers and set up the 'normal' sigcontext registers with rolled-back
160 * register values such that a simple signal handler sees a correct
161 * checkpointed register state. If interested, a TM-aware sighandler can
162 * examine the transactional registers in the 2nd sigcontext to determine the
163 * real origin of the signal.
165 static long setup_tm_sigcontexts(struct sigcontext __user *sc,
166 struct sigcontext __user *tm_sc,
167 struct pt_regs *regs,
168 int signr, sigset_t *set, unsigned long handler)
170 /* When CONFIG_ALTIVEC is set, we _always_ setup v_regs even if the
171 * process never used altivec yet (MSR_VEC is zero in pt_regs of
172 * the context). This is very important because we must ensure we
173 * don't lose the VRSAVE content that may have been set prior to
174 * the process doing its first vector operation
175 * Userland shall check AT_HWCAP to know wether it can rely on the
176 * v_regs pointer or not.
178 #ifdef CONFIG_ALTIVEC
179 elf_vrreg_t __user *v_regs = (elf_vrreg_t __user *)
180 (((unsigned long)sc->vmx_reserve + 15) & ~0xful);
181 elf_vrreg_t __user *tm_v_regs = (elf_vrreg_t __user *)
182 (((unsigned long)tm_sc->vmx_reserve + 15) & ~0xful);
184 unsigned long msr = regs->msr;
187 BUG_ON(!MSR_TM_ACTIVE(regs->msr));
189 flush_fp_to_thread(current);
191 #ifdef CONFIG_ALTIVEC
192 err |= __put_user(v_regs, &sc->v_regs);
193 err |= __put_user(tm_v_regs, &tm_sc->v_regs);
195 /* save altivec registers */
196 if (current->thread.used_vr) {
197 flush_altivec_to_thread(current);
198 /* Copy 33 vec registers (vr0..31 and vscr) to the stack */
199 err |= __copy_to_user(v_regs, ¤t->thread.vr_state,
200 33 * sizeof(vector128));
201 /* If VEC was enabled there are transactional VRs valid too,
202 * else they're a copy of the checkpointed VRs.
205 err |= __copy_to_user(tm_v_regs,
206 ¤t->thread.transact_vr,
207 33 * sizeof(vector128));
209 err |= __copy_to_user(tm_v_regs,
210 ¤t->thread.vr_state,
211 33 * sizeof(vector128));
213 /* set MSR_VEC in the MSR value in the frame to indicate
214 * that sc->v_reg contains valid data.
218 /* We always copy to/from vrsave, it's 0 if we don't have or don't
221 if (cpu_has_feature(CPU_FTR_ALTIVEC))
222 current->thread.vrsave = mfspr(SPRN_VRSAVE);
223 err |= __put_user(current->thread.vrsave, (u32 __user *)&v_regs[33]);
225 err |= __put_user(current->thread.transact_vrsave,
226 (u32 __user *)&tm_v_regs[33]);
228 err |= __put_user(current->thread.vrsave,
229 (u32 __user *)&tm_v_regs[33]);
231 #else /* CONFIG_ALTIVEC */
232 err |= __put_user(0, &sc->v_regs);
233 err |= __put_user(0, &tm_sc->v_regs);
234 #endif /* CONFIG_ALTIVEC */
236 /* copy fpr regs and fpscr */
237 err |= copy_fpr_to_user(&sc->fp_regs, current);
239 err |= copy_transact_fpr_to_user(&tm_sc->fp_regs, current);
241 err |= copy_fpr_to_user(&tm_sc->fp_regs, current);
245 * Copy VSX low doubleword to local buffer for formatting,
246 * then out to userspace. Update v_regs to point after the
249 if (current->thread.used_vsr) {
250 __giveup_vsx(current);
251 v_regs += ELF_NVRREG;
252 tm_v_regs += ELF_NVRREG;
254 err |= copy_vsx_to_user(v_regs, current);
257 err |= copy_transact_vsx_to_user(tm_v_regs, current);
259 err |= copy_vsx_to_user(tm_v_regs, current);
261 /* set MSR_VSX in the MSR value in the frame to
262 * indicate that sc->vs_reg) contains valid data.
266 #endif /* CONFIG_VSX */
268 err |= __put_user(&sc->gp_regs, &sc->regs);
269 err |= __put_user(&tm_sc->gp_regs, &tm_sc->regs);
270 WARN_ON(!FULL_REGS(regs));
271 err |= __copy_to_user(&tm_sc->gp_regs, regs, GP_REGS_SIZE);
272 err |= __copy_to_user(&sc->gp_regs,
273 ¤t->thread.ckpt_regs, GP_REGS_SIZE);
274 err |= __put_user(msr, &tm_sc->gp_regs[PT_MSR]);
275 err |= __put_user(msr, &sc->gp_regs[PT_MSR]);
276 err |= __put_user(signr, &sc->signal);
277 err |= __put_user(handler, &sc->handler);
279 err |= __put_user(set->sig[0], &sc->oldmask);
286 * Restore the sigcontext from the signal frame.
289 static long restore_sigcontext(struct pt_regs *regs, sigset_t *set, int sig,
290 struct sigcontext __user *sc)
292 #ifdef CONFIG_ALTIVEC
293 elf_vrreg_t __user *v_regs;
295 unsigned long err = 0;
296 unsigned long save_r13 = 0;
302 /* If this is not a signal return, we preserve the TLS in r13 */
304 save_r13 = regs->gpr[13];
307 err |= __copy_from_user(regs->gpr, sc->gp_regs, sizeof(regs->gpr));
308 err |= __get_user(regs->nip, &sc->gp_regs[PT_NIP]);
309 /* get MSR separately, transfer the LE bit if doing signal return */
310 err |= __get_user(msr, &sc->gp_regs[PT_MSR]);
312 regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE);
313 err |= __get_user(regs->orig_gpr3, &sc->gp_regs[PT_ORIG_R3]);
314 err |= __get_user(regs->ctr, &sc->gp_regs[PT_CTR]);
315 err |= __get_user(regs->link, &sc->gp_regs[PT_LNK]);
316 err |= __get_user(regs->xer, &sc->gp_regs[PT_XER]);
317 err |= __get_user(regs->ccr, &sc->gp_regs[PT_CCR]);
320 err |= __get_user(regs->dar, &sc->gp_regs[PT_DAR]);
321 err |= __get_user(regs->dsisr, &sc->gp_regs[PT_DSISR]);
322 err |= __get_user(regs->result, &sc->gp_regs[PT_RESULT]);
325 regs->gpr[13] = save_r13;
327 err |= __get_user(set->sig[0], &sc->oldmask);
330 * Do this before updating the thread state in
331 * current->thread.fpr/vr. That way, if we get preempted
332 * and another task grabs the FPU/Altivec, it won't be
333 * tempted to save the current CPU state into the thread_struct
334 * and corrupt what we are writing there.
336 discard_lazy_cpu_state();
339 * Force reload of FP/VEC.
340 * This has to be done before copying stuff into current->thread.fpr/vr
341 * for the reasons explained in the previous comment.
343 regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1 | MSR_VEC | MSR_VSX);
345 #ifdef CONFIG_ALTIVEC
346 err |= __get_user(v_regs, &sc->v_regs);
349 if (v_regs && !access_ok(VERIFY_READ, v_regs, 34 * sizeof(vector128)))
351 /* Copy 33 vec registers (vr0..31 and vscr) from the stack */
352 if (v_regs != NULL && (msr & MSR_VEC) != 0)
353 err |= __copy_from_user(¤t->thread.vr_state, v_regs,
354 33 * sizeof(vector128));
355 else if (current->thread.used_vr)
356 memset(¤t->thread.vr_state, 0, 33 * sizeof(vector128));
357 /* Always get VRSAVE back */
359 err |= __get_user(current->thread.vrsave, (u32 __user *)&v_regs[33]);
361 current->thread.vrsave = 0;
362 if (cpu_has_feature(CPU_FTR_ALTIVEC))
363 mtspr(SPRN_VRSAVE, current->thread.vrsave);
364 #endif /* CONFIG_ALTIVEC */
365 /* restore floating point */
366 err |= copy_fpr_from_user(current, &sc->fp_regs);
369 * Get additional VSX data. Update v_regs to point after the
370 * VMX data. Copy VSX low doubleword from userspace to local
371 * buffer for formatting, then into the taskstruct.
373 v_regs += ELF_NVRREG;
374 if ((msr & MSR_VSX) != 0)
375 err |= copy_vsx_from_user(current, v_regs);
377 for (i = 0; i < 32 ; i++)
378 current->thread.fp_state.fpr[i][TS_VSRLOWOFFSET] = 0;
383 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
385 * Restore the two sigcontexts from the frame of a transactional processes.
388 static long restore_tm_sigcontexts(struct pt_regs *regs,
389 struct sigcontext __user *sc,
390 struct sigcontext __user *tm_sc)
392 #ifdef CONFIG_ALTIVEC
393 elf_vrreg_t __user *v_regs, *tm_v_regs;
395 unsigned long err = 0;
401 err |= __copy_from_user(regs->gpr, tm_sc->gp_regs, sizeof(regs->gpr));
402 err |= __copy_from_user(¤t->thread.ckpt_regs, sc->gp_regs,
406 * TFHAR is restored from the checkpointed 'wound-back' ucontext's NIP.
407 * TEXASR was set by the signal delivery reclaim, as was TFIAR.
408 * Users doing anything abhorrent like thread-switching w/ signals for
409 * TM-Suspended code will have to back TEXASR/TFIAR up themselves.
410 * For the case of getting a signal and simply returning from it,
411 * we don't need to re-copy them here.
413 err |= __get_user(regs->nip, &tm_sc->gp_regs[PT_NIP]);
414 err |= __get_user(current->thread.tm_tfhar, &sc->gp_regs[PT_NIP]);
416 /* get MSR separately, transfer the LE bit if doing signal return */
417 err |= __get_user(msr, &sc->gp_regs[PT_MSR]);
418 /* pull in MSR TM from user context */
419 regs->msr = (regs->msr & ~MSR_TS_MASK) | (msr & MSR_TS_MASK);
421 /* pull in MSR LE from user context */
422 regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE);
424 /* The following non-GPR non-FPR non-VR state is also checkpointed: */
425 err |= __get_user(regs->ctr, &tm_sc->gp_regs[PT_CTR]);
426 err |= __get_user(regs->link, &tm_sc->gp_regs[PT_LNK]);
427 err |= __get_user(regs->xer, &tm_sc->gp_regs[PT_XER]);
428 err |= __get_user(regs->ccr, &tm_sc->gp_regs[PT_CCR]);
429 err |= __get_user(current->thread.ckpt_regs.ctr,
430 &sc->gp_regs[PT_CTR]);
431 err |= __get_user(current->thread.ckpt_regs.link,
432 &sc->gp_regs[PT_LNK]);
433 err |= __get_user(current->thread.ckpt_regs.xer,
434 &sc->gp_regs[PT_XER]);
435 err |= __get_user(current->thread.ckpt_regs.ccr,
436 &sc->gp_regs[PT_CCR]);
438 /* These regs are not checkpointed; they can go in 'regs'. */
439 err |= __get_user(regs->trap, &sc->gp_regs[PT_TRAP]);
440 err |= __get_user(regs->dar, &sc->gp_regs[PT_DAR]);
441 err |= __get_user(regs->dsisr, &sc->gp_regs[PT_DSISR]);
442 err |= __get_user(regs->result, &sc->gp_regs[PT_RESULT]);
445 * Do this before updating the thread state in
446 * current->thread.fpr/vr. That way, if we get preempted
447 * and another task grabs the FPU/Altivec, it won't be
448 * tempted to save the current CPU state into the thread_struct
449 * and corrupt what we are writing there.
451 discard_lazy_cpu_state();
454 * Force reload of FP/VEC.
455 * This has to be done before copying stuff into current->thread.fpr/vr
456 * for the reasons explained in the previous comment.
458 regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1 | MSR_VEC | MSR_VSX);
460 #ifdef CONFIG_ALTIVEC
461 err |= __get_user(v_regs, &sc->v_regs);
462 err |= __get_user(tm_v_regs, &tm_sc->v_regs);
465 if (v_regs && !access_ok(VERIFY_READ, v_regs, 34 * sizeof(vector128)))
467 if (tm_v_regs && !access_ok(VERIFY_READ,
468 tm_v_regs, 34 * sizeof(vector128)))
470 /* Copy 33 vec registers (vr0..31 and vscr) from the stack */
471 if (v_regs != NULL && tm_v_regs != NULL && (msr & MSR_VEC) != 0) {
472 err |= __copy_from_user(¤t->thread.vr_state, v_regs,
473 33 * sizeof(vector128));
474 err |= __copy_from_user(¤t->thread.transact_vr, tm_v_regs,
475 33 * sizeof(vector128));
477 else if (current->thread.used_vr) {
478 memset(¤t->thread.vr_state, 0, 33 * sizeof(vector128));
479 memset(¤t->thread.transact_vr, 0, 33 * sizeof(vector128));
481 /* Always get VRSAVE back */
482 if (v_regs != NULL && tm_v_regs != NULL) {
483 err |= __get_user(current->thread.vrsave,
484 (u32 __user *)&v_regs[33]);
485 err |= __get_user(current->thread.transact_vrsave,
486 (u32 __user *)&tm_v_regs[33]);
489 current->thread.vrsave = 0;
490 current->thread.transact_vrsave = 0;
492 if (cpu_has_feature(CPU_FTR_ALTIVEC))
493 mtspr(SPRN_VRSAVE, current->thread.vrsave);
494 #endif /* CONFIG_ALTIVEC */
495 /* restore floating point */
496 err |= copy_fpr_from_user(current, &sc->fp_regs);
497 err |= copy_transact_fpr_from_user(current, &tm_sc->fp_regs);
500 * Get additional VSX data. Update v_regs to point after the
501 * VMX data. Copy VSX low doubleword from userspace to local
502 * buffer for formatting, then into the taskstruct.
504 if (v_regs && ((msr & MSR_VSX) != 0)) {
505 v_regs += ELF_NVRREG;
506 tm_v_regs += ELF_NVRREG;
507 err |= copy_vsx_from_user(current, v_regs);
508 err |= copy_transact_vsx_from_user(current, tm_v_regs);
510 for (i = 0; i < 32 ; i++) {
511 current->thread.fp_state.fpr[i][TS_VSRLOWOFFSET] = 0;
512 current->thread.transact_fp.fpr[i][TS_VSRLOWOFFSET] = 0;
517 /* This loads the checkpointed FP/VEC state, if used */
518 tm_recheckpoint(¤t->thread, msr);
520 /* This loads the speculative FP/VEC state, if used */
522 do_load_up_transact_fpu(¤t->thread);
523 regs->msr |= (MSR_FP | current->thread.fpexc_mode);
525 #ifdef CONFIG_ALTIVEC
527 do_load_up_transact_altivec(¤t->thread);
528 regs->msr |= MSR_VEC;
537 * Setup the trampoline code on the stack
539 static long setup_trampoline(unsigned int syscall, unsigned int __user *tramp)
544 /* addi r1, r1, __SIGNAL_FRAMESIZE # Pop the dummy stackframe */
545 err |= __put_user(0x38210000UL | (__SIGNAL_FRAMESIZE & 0xffff), &tramp[0]);
546 /* li r0, __NR_[rt_]sigreturn| */
547 err |= __put_user(0x38000000UL | (syscall & 0xffff), &tramp[1]);
549 err |= __put_user(0x44000002UL, &tramp[2]);
551 /* Minimal traceback info */
552 for (i=TRAMP_TRACEBACK; i < TRAMP_SIZE ;i++)
553 err |= __put_user(0, &tramp[i]);
556 flush_icache_range((unsigned long) &tramp[0],
557 (unsigned long) &tramp[TRAMP_SIZE]);
563 * Userspace code may pass a ucontext which doesn't include VSX added
564 * at the end. We need to check for this case.
566 #define UCONTEXTSIZEWITHOUTVSX \
567 (sizeof(struct ucontext) - 32*sizeof(long))
570 * Handle {get,set,swap}_context operations
572 int sys_swapcontext(struct ucontext __user *old_ctx,
573 struct ucontext __user *new_ctx,
574 long ctx_size, long r6, long r7, long r8, struct pt_regs *regs)
578 unsigned long new_msr = 0;
579 int ctx_has_vsx_region = 0;
582 get_user(new_msr, &new_ctx->uc_mcontext.gp_regs[PT_MSR]))
585 * Check that the context is not smaller than the original
586 * size (with VMX but without VSX)
588 if (ctx_size < UCONTEXTSIZEWITHOUTVSX)
591 * If the new context state sets the MSR VSX bits but
592 * it doesn't provide VSX state.
594 if ((ctx_size < sizeof(struct ucontext)) &&
597 /* Does the context have enough room to store VSX data? */
598 if (ctx_size >= sizeof(struct ucontext))
599 ctx_has_vsx_region = 1;
601 if (old_ctx != NULL) {
602 if (!access_ok(VERIFY_WRITE, old_ctx, ctx_size)
603 || setup_sigcontext(&old_ctx->uc_mcontext, regs, 0, NULL, 0,
605 || __copy_to_user(&old_ctx->uc_sigmask,
606 ¤t->blocked, sizeof(sigset_t)))
611 if (!access_ok(VERIFY_READ, new_ctx, ctx_size)
612 || __get_user(tmp, (u8 __user *) new_ctx)
613 || __get_user(tmp, (u8 __user *) new_ctx + ctx_size - 1))
617 * If we get a fault copying the context into the kernel's
618 * image of the user's registers, we can't just return -EFAULT
619 * because the user's registers will be corrupted. For instance
620 * the NIP value may have been updated but not some of the
621 * other registers. Given that we have done the access_ok
622 * and successfully read the first and last bytes of the region
623 * above, this should only happen in an out-of-memory situation
624 * or if another thread unmaps the region containing the context.
625 * We kill the task with a SIGSEGV in this situation.
628 if (__copy_from_user(&set, &new_ctx->uc_sigmask, sizeof(set)))
630 set_current_blocked(&set);
631 if (restore_sigcontext(regs, NULL, 0, &new_ctx->uc_mcontext))
634 /* This returns like rt_sigreturn */
635 set_thread_flag(TIF_RESTOREALL);
641 * Do a signal return; undo the signal stack.
644 int sys_rt_sigreturn(unsigned long r3, unsigned long r4, unsigned long r5,
645 unsigned long r6, unsigned long r7, unsigned long r8,
646 struct pt_regs *regs)
648 struct ucontext __user *uc = (struct ucontext __user *)regs->gpr[1];
650 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
654 /* Always make any pending restarted system calls return -EINTR */
655 current_thread_info()->restart_block.fn = do_no_restart_syscall;
657 if (!access_ok(VERIFY_READ, uc, sizeof(*uc)))
660 if (__copy_from_user(&set, &uc->uc_sigmask, sizeof(set)))
662 set_current_blocked(&set);
663 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
664 if (__get_user(msr, &uc->uc_mcontext.gp_regs[PT_MSR]))
666 if (MSR_TM_ACTIVE(msr)) {
667 /* We recheckpoint on return. */
668 struct ucontext __user *uc_transact;
669 if (__get_user(uc_transact, &uc->uc_link))
671 if (restore_tm_sigcontexts(regs, &uc->uc_mcontext,
672 &uc_transact->uc_mcontext))
676 /* Fall through, for non-TM restore */
678 if (restore_sigcontext(regs, NULL, 1, &uc->uc_mcontext))
681 if (restore_altstack(&uc->uc_stack))
684 set_thread_flag(TIF_RESTOREALL);
689 printk("badframe in sys_rt_sigreturn, regs=%p uc=%p &uc->uc_mcontext=%p\n",
690 regs, uc, &uc->uc_mcontext);
692 if (show_unhandled_signals)
693 printk_ratelimited(regs->msr & MSR_64BIT ? fmt64 : fmt32,
694 current->comm, current->pid, "rt_sigreturn",
695 (long)uc, regs->nip, regs->link);
697 force_sig(SIGSEGV, current);
701 int handle_rt_signal64(int signr, struct k_sigaction *ka, siginfo_t *info,
702 sigset_t *set, struct pt_regs *regs)
704 struct rt_sigframe __user *frame;
705 unsigned long newsp = 0;
708 frame = get_sigframe(ka, get_tm_stackpointer(regs), sizeof(*frame), 0);
709 if (unlikely(frame == NULL))
712 err |= __put_user(&frame->info, &frame->pinfo);
713 err |= __put_user(&frame->uc, &frame->puc);
714 err |= copy_siginfo_to_user(&frame->info, info);
718 /* Create the ucontext. */
719 err |= __put_user(0, &frame->uc.uc_flags);
720 err |= __save_altstack(&frame->uc.uc_stack, regs->gpr[1]);
721 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
722 if (MSR_TM_ACTIVE(regs->msr)) {
723 /* The ucontext_t passed to userland points to the second
724 * ucontext_t (for transactional state) with its uc_link ptr.
726 err |= __put_user(&frame->uc_transact, &frame->uc.uc_link);
727 err |= setup_tm_sigcontexts(&frame->uc.uc_mcontext,
728 &frame->uc_transact.uc_mcontext,
731 (unsigned long)ka->sa.sa_handler);
735 err |= __put_user(0, &frame->uc.uc_link);
736 err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, signr,
737 NULL, (unsigned long)ka->sa.sa_handler,
740 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
744 /* Make sure signal handler doesn't get spurious FP exceptions */
745 current->thread.fp_state.fpscr = 0;
746 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
747 /* Remove TM bits from thread's MSR. The MSR in the sigcontext
748 * just indicates to userland that we were doing a transaction, but we
749 * don't want to return in transactional state:
751 regs->msr &= ~MSR_TS_MASK;
754 /* Set up to return from userspace. */
755 if (vdso64_rt_sigtramp && current->mm->context.vdso_base) {
756 regs->link = current->mm->context.vdso_base + vdso64_rt_sigtramp;
758 err |= setup_trampoline(__NR_rt_sigreturn, &frame->tramp[0]);
761 regs->link = (unsigned long) &frame->tramp[0];
764 /* Allocate a dummy caller frame for the signal handler. */
765 newsp = ((unsigned long)frame) - __SIGNAL_FRAMESIZE;
766 err |= put_user(regs->gpr[1], (unsigned long __user *)newsp);
768 /* Set up "regs" so we "return" to the signal handler. */
769 if (is_elf2_task()) {
770 regs->nip = (unsigned long) ka->sa.sa_handler;
771 regs->gpr[12] = regs->nip;
773 /* Handler is *really* a pointer to the function descriptor for
774 * the signal routine. The first entry in the function
775 * descriptor is the entry address of signal and the second
776 * entry is the TOC value we need to use.
778 func_descr_t __user *funct_desc_ptr =
779 (func_descr_t __user *) ka->sa.sa_handler;
781 err |= get_user(regs->nip, &funct_desc_ptr->entry);
782 err |= get_user(regs->gpr[2], &funct_desc_ptr->toc);
785 /* enter the signal handler in native-endian mode */
786 regs->msr &= ~MSR_LE;
787 regs->msr |= (MSR_KERNEL & MSR_LE);
788 regs->gpr[1] = newsp;
789 regs->gpr[3] = signr;
791 if (ka->sa.sa_flags & SA_SIGINFO) {
792 err |= get_user(regs->gpr[4], (unsigned long __user *)&frame->pinfo);
793 err |= get_user(regs->gpr[5], (unsigned long __user *)&frame->puc);
794 regs->gpr[6] = (unsigned long) frame;
796 regs->gpr[4] = (unsigned long)&frame->uc.uc_mcontext;
805 printk("badframe in setup_rt_frame, regs=%p frame=%p newsp=%lx\n",
808 if (show_unhandled_signals)
809 printk_ratelimited(regs->msr & MSR_64BIT ? fmt64 : fmt32,
810 current->comm, current->pid, "setup_rt_frame",
811 (long)frame, regs->nip, regs->link);
813 force_sigsegv(signr, current);