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;
99 flush_fp_to_thread(current);
101 #ifdef CONFIG_ALTIVEC
102 err |= __put_user(v_regs, &sc->v_regs);
104 /* save altivec registers */
105 if (current->thread.used_vr) {
106 flush_altivec_to_thread(current);
107 /* Copy 33 vec registers (vr0..31 and vscr) to the stack */
108 err |= __copy_to_user(v_regs, current->thread.vr, 33 * sizeof(vector128));
109 /* set MSR_VEC in the MSR value in the frame to indicate that sc->v_reg)
110 * contains valid data.
114 /* We always copy to/from vrsave, it's 0 if we don't have or don't
117 err |= __put_user(current->thread.vrsave, (u32 __user *)&v_regs[33]);
118 #else /* CONFIG_ALTIVEC */
119 err |= __put_user(0, &sc->v_regs);
120 #endif /* CONFIG_ALTIVEC */
121 flush_fp_to_thread(current);
122 /* copy fpr regs and fpscr */
123 err |= copy_fpr_to_user(&sc->fp_regs, current);
126 * Clear the MSR VSX bit to indicate there is no valid state attached
127 * to this context, except in the specific case below where we set it.
132 * Copy VSX low doubleword to local buffer for formatting,
133 * then out to userspace. Update v_regs to point after the
136 if (current->thread.used_vsr && ctx_has_vsx_region) {
137 __giveup_vsx(current);
138 v_regs += ELF_NVRREG;
139 err |= copy_vsx_to_user(v_regs, current);
140 /* set MSR_VSX in the MSR value in the frame to
141 * indicate that sc->vs_reg) contains valid data.
145 #endif /* CONFIG_VSX */
146 err |= __put_user(&sc->gp_regs, &sc->regs);
147 WARN_ON(!FULL_REGS(regs));
148 err |= __copy_to_user(&sc->gp_regs, regs, GP_REGS_SIZE);
149 err |= __put_user(msr, &sc->gp_regs[PT_MSR]);
150 err |= __put_user(signr, &sc->signal);
151 err |= __put_user(handler, &sc->handler);
153 err |= __put_user(set->sig[0], &sc->oldmask);
158 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
160 * As above, but Transactional Memory is in use, so deliver sigcontexts
161 * containing checkpointed and transactional register states.
163 * To do this, we treclaim (done before entering here) to gather both sets of
164 * registers and set up the 'normal' sigcontext registers with rolled-back
165 * register values such that a simple signal handler sees a correct
166 * checkpointed register state. If interested, a TM-aware sighandler can
167 * examine the transactional registers in the 2nd sigcontext to determine the
168 * real origin of the signal.
170 static long setup_tm_sigcontexts(struct sigcontext __user *sc,
171 struct sigcontext __user *tm_sc,
172 struct pt_regs *regs,
173 int signr, sigset_t *set, unsigned long handler)
175 /* When CONFIG_ALTIVEC is set, we _always_ setup v_regs even if the
176 * process never used altivec yet (MSR_VEC is zero in pt_regs of
177 * the context). This is very important because we must ensure we
178 * don't lose the VRSAVE content that may have been set prior to
179 * the process doing its first vector operation
180 * Userland shall check AT_HWCAP to know wether it can rely on the
181 * v_regs pointer or not.
183 #ifdef CONFIG_ALTIVEC
184 elf_vrreg_t __user *v_regs = (elf_vrreg_t __user *)
185 (((unsigned long)sc->vmx_reserve + 15) & ~0xful);
186 elf_vrreg_t __user *tm_v_regs = (elf_vrreg_t __user *)
187 (((unsigned long)tm_sc->vmx_reserve + 15) & ~0xful);
189 unsigned long msr = regs->msr;
192 BUG_ON(!MSR_TM_ACTIVE(regs->msr));
194 flush_fp_to_thread(current);
196 #ifdef CONFIG_ALTIVEC
197 err |= __put_user(v_regs, &sc->v_regs);
198 err |= __put_user(tm_v_regs, &tm_sc->v_regs);
200 /* save altivec registers */
201 if (current->thread.used_vr) {
202 flush_altivec_to_thread(current);
203 /* Copy 33 vec registers (vr0..31 and vscr) to the stack */
204 err |= __copy_to_user(v_regs, current->thread.vr,
205 33 * sizeof(vector128));
206 /* If VEC was enabled there are transactional VRs valid too,
207 * else they're a copy of the checkpointed VRs.
210 err |= __copy_to_user(tm_v_regs,
211 current->thread.transact_vr,
212 33 * sizeof(vector128));
214 err |= __copy_to_user(tm_v_regs,
216 33 * sizeof(vector128));
218 /* set MSR_VEC in the MSR value in the frame to indicate
219 * that sc->v_reg contains valid data.
223 /* We always copy to/from vrsave, it's 0 if we don't have or don't
226 err |= __put_user(current->thread.vrsave, (u32 __user *)&v_regs[33]);
228 err |= __put_user(current->thread.transact_vrsave,
229 (u32 __user *)&tm_v_regs[33]);
231 err |= __put_user(current->thread.vrsave,
232 (u32 __user *)&tm_v_regs[33]);
234 #else /* CONFIG_ALTIVEC */
235 err |= __put_user(0, &sc->v_regs);
236 err |= __put_user(0, &tm_sc->v_regs);
237 #endif /* CONFIG_ALTIVEC */
239 /* copy fpr regs and fpscr */
240 err |= copy_fpr_to_user(&sc->fp_regs, current);
242 err |= copy_transact_fpr_to_user(&tm_sc->fp_regs, current);
244 err |= copy_fpr_to_user(&tm_sc->fp_regs, current);
248 * Copy VSX low doubleword to local buffer for formatting,
249 * then out to userspace. Update v_regs to point after the
252 if (current->thread.used_vsr) {
253 __giveup_vsx(current);
254 v_regs += ELF_NVRREG;
255 tm_v_regs += ELF_NVRREG;
257 err |= copy_vsx_to_user(v_regs, current);
260 err |= copy_transact_vsx_to_user(tm_v_regs, current);
262 err |= copy_vsx_to_user(tm_v_regs, current);
264 /* set MSR_VSX in the MSR value in the frame to
265 * indicate that sc->vs_reg) contains valid data.
269 #endif /* CONFIG_VSX */
271 err |= __put_user(&sc->gp_regs, &sc->regs);
272 err |= __put_user(&tm_sc->gp_regs, &tm_sc->regs);
273 WARN_ON(!FULL_REGS(regs));
274 err |= __copy_to_user(&tm_sc->gp_regs, regs, GP_REGS_SIZE);
275 err |= __copy_to_user(&sc->gp_regs,
276 ¤t->thread.ckpt_regs, GP_REGS_SIZE);
277 err |= __put_user(msr, &tm_sc->gp_regs[PT_MSR]);
278 err |= __put_user(msr, &sc->gp_regs[PT_MSR]);
279 err |= __put_user(signr, &sc->signal);
280 err |= __put_user(handler, &sc->handler);
282 err |= __put_user(set->sig[0], &sc->oldmask);
289 * Restore the sigcontext from the signal frame.
292 static long restore_sigcontext(struct pt_regs *regs, sigset_t *set, int sig,
293 struct sigcontext __user *sc)
295 #ifdef CONFIG_ALTIVEC
296 elf_vrreg_t __user *v_regs;
298 unsigned long err = 0;
299 unsigned long save_r13 = 0;
305 /* If this is not a signal return, we preserve the TLS in r13 */
307 save_r13 = regs->gpr[13];
310 err |= __copy_from_user(regs->gpr, sc->gp_regs, sizeof(regs->gpr));
311 err |= __get_user(regs->nip, &sc->gp_regs[PT_NIP]);
312 /* get MSR separately, transfer the LE bit if doing signal return */
313 err |= __get_user(msr, &sc->gp_regs[PT_MSR]);
315 regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE);
316 err |= __get_user(regs->orig_gpr3, &sc->gp_regs[PT_ORIG_R3]);
317 err |= __get_user(regs->ctr, &sc->gp_regs[PT_CTR]);
318 err |= __get_user(regs->link, &sc->gp_regs[PT_LNK]);
319 err |= __get_user(regs->xer, &sc->gp_regs[PT_XER]);
320 err |= __get_user(regs->ccr, &sc->gp_regs[PT_CCR]);
323 err |= __get_user(regs->dar, &sc->gp_regs[PT_DAR]);
324 err |= __get_user(regs->dsisr, &sc->gp_regs[PT_DSISR]);
325 err |= __get_user(regs->result, &sc->gp_regs[PT_RESULT]);
328 regs->gpr[13] = save_r13;
330 err |= __get_user(set->sig[0], &sc->oldmask);
333 * Do this before updating the thread state in
334 * current->thread.fpr/vr. That way, if we get preempted
335 * and another task grabs the FPU/Altivec, it won't be
336 * tempted to save the current CPU state into the thread_struct
337 * and corrupt what we are writing there.
339 discard_lazy_cpu_state();
342 * Force reload of FP/VEC.
343 * This has to be done before copying stuff into current->thread.fpr/vr
344 * for the reasons explained in the previous comment.
346 regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1 | MSR_VEC | MSR_VSX);
348 #ifdef CONFIG_ALTIVEC
349 err |= __get_user(v_regs, &sc->v_regs);
352 if (v_regs && !access_ok(VERIFY_READ, v_regs, 34 * sizeof(vector128)))
354 /* Copy 33 vec registers (vr0..31 and vscr) from the stack */
355 if (v_regs != 0 && (msr & MSR_VEC) != 0)
356 err |= __copy_from_user(current->thread.vr, v_regs,
357 33 * sizeof(vector128));
358 else if (current->thread.used_vr)
359 memset(current->thread.vr, 0, 33 * sizeof(vector128));
360 /* Always get VRSAVE back */
362 err |= __get_user(current->thread.vrsave, (u32 __user *)&v_regs[33]);
364 current->thread.vrsave = 0;
365 #endif /* CONFIG_ALTIVEC */
366 /* restore floating point */
367 err |= copy_fpr_from_user(current, &sc->fp_regs);
370 * Get additional VSX data. Update v_regs to point after the
371 * VMX data. Copy VSX low doubleword from userspace to local
372 * buffer for formatting, then into the taskstruct.
374 v_regs += ELF_NVRREG;
375 if ((msr & MSR_VSX) != 0)
376 err |= copy_vsx_from_user(current, v_regs);
378 for (i = 0; i < 32 ; i++)
379 current->thread.fpr[i][TS_VSRLOWOFFSET] = 0;
384 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
386 * Restore the two sigcontexts from the frame of a transactional processes.
389 static long restore_tm_sigcontexts(struct pt_regs *regs,
390 struct sigcontext __user *sc,
391 struct sigcontext __user *tm_sc)
393 #ifdef CONFIG_ALTIVEC
394 elf_vrreg_t __user *v_regs, *tm_v_regs;
396 unsigned long err = 0;
402 err |= __copy_from_user(regs->gpr, tm_sc->gp_regs, sizeof(regs->gpr));
403 err |= __copy_from_user(¤t->thread.ckpt_regs, sc->gp_regs,
407 * TFHAR is restored from the checkpointed 'wound-back' ucontext's NIP.
408 * TEXASR was set by the signal delivery reclaim, as was TFIAR.
409 * Users doing anything abhorrent like thread-switching w/ signals for
410 * TM-Suspended code will have to back TEXASR/TFIAR up themselves.
411 * For the case of getting a signal and simply returning from it,
412 * we don't need to re-copy them here.
414 err |= __get_user(regs->nip, &tm_sc->gp_regs[PT_NIP]);
415 err |= __get_user(current->thread.tm_tfhar, &sc->gp_regs[PT_NIP]);
417 /* get MSR separately, transfer the LE bit if doing signal return */
418 err |= __get_user(msr, &sc->gp_regs[PT_MSR]);
419 /* pull in MSR TM from user context */
420 regs->msr = (regs->msr & ~MSR_TS_MASK) | (msr & MSR_TS_MASK);
422 /* pull in MSR LE from user context */
423 regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE);
425 /* The following non-GPR non-FPR non-VR state is also checkpointed: */
426 err |= __get_user(regs->ctr, &tm_sc->gp_regs[PT_CTR]);
427 err |= __get_user(regs->link, &tm_sc->gp_regs[PT_LNK]);
428 err |= __get_user(regs->xer, &tm_sc->gp_regs[PT_XER]);
429 err |= __get_user(regs->ccr, &tm_sc->gp_regs[PT_CCR]);
430 err |= __get_user(current->thread.ckpt_regs.ctr,
431 &sc->gp_regs[PT_CTR]);
432 err |= __get_user(current->thread.ckpt_regs.link,
433 &sc->gp_regs[PT_LNK]);
434 err |= __get_user(current->thread.ckpt_regs.xer,
435 &sc->gp_regs[PT_XER]);
436 err |= __get_user(current->thread.ckpt_regs.ccr,
437 &sc->gp_regs[PT_CCR]);
439 /* These regs are not checkpointed; they can go in 'regs'. */
440 err |= __get_user(regs->trap, &sc->gp_regs[PT_TRAP]);
441 err |= __get_user(regs->dar, &sc->gp_regs[PT_DAR]);
442 err |= __get_user(regs->dsisr, &sc->gp_regs[PT_DSISR]);
443 err |= __get_user(regs->result, &sc->gp_regs[PT_RESULT]);
446 * Do this before updating the thread state in
447 * current->thread.fpr/vr. That way, if we get preempted
448 * and another task grabs the FPU/Altivec, it won't be
449 * tempted to save the current CPU state into the thread_struct
450 * and corrupt what we are writing there.
452 discard_lazy_cpu_state();
455 * Force reload of FP/VEC.
456 * This has to be done before copying stuff into current->thread.fpr/vr
457 * for the reasons explained in the previous comment.
459 regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1 | MSR_VEC | MSR_VSX);
461 #ifdef CONFIG_ALTIVEC
462 err |= __get_user(v_regs, &sc->v_regs);
463 err |= __get_user(tm_v_regs, &tm_sc->v_regs);
466 if (v_regs && !access_ok(VERIFY_READ, v_regs, 34 * sizeof(vector128)))
468 if (tm_v_regs && !access_ok(VERIFY_READ,
469 tm_v_regs, 34 * sizeof(vector128)))
471 /* Copy 33 vec registers (vr0..31 and vscr) from the stack */
472 if (v_regs != 0 && tm_v_regs != 0 && (msr & MSR_VEC) != 0) {
473 err |= __copy_from_user(current->thread.vr, v_regs,
474 33 * sizeof(vector128));
475 err |= __copy_from_user(current->thread.transact_vr, tm_v_regs,
476 33 * sizeof(vector128));
478 else if (current->thread.used_vr) {
479 memset(current->thread.vr, 0, 33 * sizeof(vector128));
480 memset(current->thread.transact_vr, 0, 33 * sizeof(vector128));
482 /* Always get VRSAVE back */
483 if (v_regs != 0 && tm_v_regs != 0) {
484 err |= __get_user(current->thread.vrsave,
485 (u32 __user *)&v_regs[33]);
486 err |= __get_user(current->thread.transact_vrsave,
487 (u32 __user *)&tm_v_regs[33]);
490 current->thread.vrsave = 0;
491 current->thread.transact_vrsave = 0;
493 #endif /* CONFIG_ALTIVEC */
494 /* restore floating point */
495 err |= copy_fpr_from_user(current, &sc->fp_regs);
496 err |= copy_transact_fpr_from_user(current, &tm_sc->fp_regs);
499 * Get additional VSX data. Update v_regs to point after the
500 * VMX data. Copy VSX low doubleword from userspace to local
501 * buffer for formatting, then into the taskstruct.
503 if (v_regs && ((msr & MSR_VSX) != 0)) {
504 v_regs += ELF_NVRREG;
505 tm_v_regs += ELF_NVRREG;
506 err |= copy_vsx_from_user(current, v_regs);
507 err |= copy_transact_vsx_from_user(current, tm_v_regs);
509 for (i = 0; i < 32 ; i++) {
510 current->thread.fpr[i][TS_VSRLOWOFFSET] = 0;
511 current->thread.transact_fpr[i][TS_VSRLOWOFFSET] = 0;
516 /* This loads the checkpointed FP/VEC state, if used */
517 tm_recheckpoint(¤t->thread, msr);
519 /* This loads the speculative FP/VEC state, if used */
521 do_load_up_transact_fpu(¤t->thread);
522 regs->msr |= (MSR_FP | current->thread.fpexc_mode);
524 #ifdef CONFIG_ALTIVEC
526 do_load_up_transact_altivec(¤t->thread);
527 regs->msr |= MSR_VEC;
536 * Setup the trampoline code on the stack
538 static long setup_trampoline(unsigned int syscall, unsigned int __user *tramp)
543 /* addi r1, r1, __SIGNAL_FRAMESIZE # Pop the dummy stackframe */
544 err |= __put_user(0x38210000UL | (__SIGNAL_FRAMESIZE & 0xffff), &tramp[0]);
545 /* li r0, __NR_[rt_]sigreturn| */
546 err |= __put_user(0x38000000UL | (syscall & 0xffff), &tramp[1]);
548 err |= __put_user(0x44000002UL, &tramp[2]);
550 /* Minimal traceback info */
551 for (i=TRAMP_TRACEBACK; i < TRAMP_SIZE ;i++)
552 err |= __put_user(0, &tramp[i]);
555 flush_icache_range((unsigned long) &tramp[0],
556 (unsigned long) &tramp[TRAMP_SIZE]);
562 * Userspace code may pass a ucontext which doesn't include VSX added
563 * at the end. We need to check for this case.
565 #define UCONTEXTSIZEWITHOUTVSX \
566 (sizeof(struct ucontext) - 32*sizeof(long))
569 * Handle {get,set,swap}_context operations
571 int sys_swapcontext(struct ucontext __user *old_ctx,
572 struct ucontext __user *new_ctx,
573 long ctx_size, long r6, long r7, long r8, struct pt_regs *regs)
577 unsigned long new_msr = 0;
578 int ctx_has_vsx_region = 0;
581 get_user(new_msr, &new_ctx->uc_mcontext.gp_regs[PT_MSR]))
584 * Check that the context is not smaller than the original
585 * size (with VMX but without VSX)
587 if (ctx_size < UCONTEXTSIZEWITHOUTVSX)
590 * If the new context state sets the MSR VSX bits but
591 * it doesn't provide VSX state.
593 if ((ctx_size < sizeof(struct ucontext)) &&
596 /* Does the context have enough room to store VSX data? */
597 if (ctx_size >= sizeof(struct ucontext))
598 ctx_has_vsx_region = 1;
600 if (old_ctx != NULL) {
601 if (!access_ok(VERIFY_WRITE, old_ctx, ctx_size)
602 || setup_sigcontext(&old_ctx->uc_mcontext, regs, 0, NULL, 0,
604 || __copy_to_user(&old_ctx->uc_sigmask,
605 ¤t->blocked, sizeof(sigset_t)))
610 if (!access_ok(VERIFY_READ, new_ctx, ctx_size)
611 || __get_user(tmp, (u8 __user *) new_ctx)
612 || __get_user(tmp, (u8 __user *) new_ctx + ctx_size - 1))
616 * If we get a fault copying the context into the kernel's
617 * image of the user's registers, we can't just return -EFAULT
618 * because the user's registers will be corrupted. For instance
619 * the NIP value may have been updated but not some of the
620 * other registers. Given that we have done the access_ok
621 * and successfully read the first and last bytes of the region
622 * above, this should only happen in an out-of-memory situation
623 * or if another thread unmaps the region containing the context.
624 * We kill the task with a SIGSEGV in this situation.
627 if (__copy_from_user(&set, &new_ctx->uc_sigmask, sizeof(set)))
629 set_current_blocked(&set);
630 if (restore_sigcontext(regs, NULL, 0, &new_ctx->uc_mcontext))
633 /* This returns like rt_sigreturn */
634 set_thread_flag(TIF_RESTOREALL);
640 * Do a signal return; undo the signal stack.
643 int sys_rt_sigreturn(unsigned long r3, unsigned long r4, unsigned long r5,
644 unsigned long r6, unsigned long r7, unsigned long r8,
645 struct pt_regs *regs)
647 struct ucontext __user *uc = (struct ucontext __user *)regs->gpr[1];
649 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
653 /* Always make any pending restarted system calls return -EINTR */
654 current_thread_info()->restart_block.fn = do_no_restart_syscall;
656 if (!access_ok(VERIFY_READ, uc, sizeof(*uc)))
659 if (__copy_from_user(&set, &uc->uc_sigmask, sizeof(set)))
661 set_current_blocked(&set);
662 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
663 if (__get_user(msr, &uc->uc_mcontext.gp_regs[PT_MSR]))
665 if (MSR_TM_ACTIVE(msr)) {
666 /* We recheckpoint on return. */
667 struct ucontext __user *uc_transact;
668 if (__get_user(uc_transact, &uc->uc_link))
670 if (restore_tm_sigcontexts(regs, &uc->uc_mcontext,
671 &uc_transact->uc_mcontext))
675 /* Fall through, for non-TM restore */
677 if (restore_sigcontext(regs, NULL, 1, &uc->uc_mcontext))
680 if (restore_altstack(&uc->uc_stack))
683 set_thread_flag(TIF_RESTOREALL);
688 printk("badframe in sys_rt_sigreturn, regs=%p uc=%p &uc->uc_mcontext=%p\n",
689 regs, uc, &uc->uc_mcontext);
691 if (show_unhandled_signals)
692 printk_ratelimited(regs->msr & MSR_64BIT ? fmt64 : fmt32,
693 current->comm, current->pid, "rt_sigreturn",
694 (long)uc, regs->nip, regs->link);
696 force_sig(SIGSEGV, current);
700 int handle_rt_signal64(int signr, struct k_sigaction *ka, siginfo_t *info,
701 sigset_t *set, struct pt_regs *regs)
703 /* Handler is *really* a pointer to the function descriptor for
704 * the signal routine. The first entry in the function
705 * descriptor is the entry address of signal and the second
706 * entry is the TOC value we need to use.
708 func_descr_t __user *funct_desc_ptr;
709 struct rt_sigframe __user *frame;
710 unsigned long newsp = 0;
713 frame = get_sigframe(ka, get_tm_stackpointer(regs), sizeof(*frame), 0);
714 if (unlikely(frame == NULL))
717 err |= __put_user(&frame->info, &frame->pinfo);
718 err |= __put_user(&frame->uc, &frame->puc);
719 err |= copy_siginfo_to_user(&frame->info, info);
723 /* Create the ucontext. */
724 err |= __put_user(0, &frame->uc.uc_flags);
725 err |= __save_altstack(&frame->uc.uc_stack, regs->gpr[1]);
726 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
727 if (MSR_TM_ACTIVE(regs->msr)) {
728 /* The ucontext_t passed to userland points to the second
729 * ucontext_t (for transactional state) with its uc_link ptr.
731 err |= __put_user(&frame->uc_transact, &frame->uc.uc_link);
732 err |= setup_tm_sigcontexts(&frame->uc.uc_mcontext,
733 &frame->uc_transact.uc_mcontext,
736 (unsigned long)ka->sa.sa_handler);
740 err |= __put_user(0, &frame->uc.uc_link);
741 err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, signr,
742 NULL, (unsigned long)ka->sa.sa_handler,
745 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
749 /* Make sure signal handler doesn't get spurious FP exceptions */
750 current->thread.fpscr.val = 0;
751 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
752 /* Remove TM bits from thread's MSR. The MSR in the sigcontext
753 * just indicates to userland that we were doing a transaction, but we
754 * don't want to return in transactional state:
756 regs->msr &= ~MSR_TS_MASK;
759 /* Set up to return from userspace. */
760 if (vdso64_rt_sigtramp && current->mm->context.vdso_base) {
761 regs->link = current->mm->context.vdso_base + vdso64_rt_sigtramp;
763 err |= setup_trampoline(__NR_rt_sigreturn, &frame->tramp[0]);
766 regs->link = (unsigned long) &frame->tramp[0];
768 funct_desc_ptr = (func_descr_t __user *) ka->sa.sa_handler;
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 err |= get_user(regs->nip, &funct_desc_ptr->entry);
776 /* enter the signal handler in big-endian mode */
777 regs->msr &= ~MSR_LE;
778 regs->gpr[1] = newsp;
779 err |= get_user(regs->gpr[2], &funct_desc_ptr->toc);
780 regs->gpr[3] = signr;
782 if (ka->sa.sa_flags & SA_SIGINFO) {
783 err |= get_user(regs->gpr[4], (unsigned long __user *)&frame->pinfo);
784 err |= get_user(regs->gpr[5], (unsigned long __user *)&frame->puc);
785 regs->gpr[6] = (unsigned long) frame;
787 regs->gpr[4] = (unsigned long)&frame->uc.uc_mcontext;
796 printk("badframe in setup_rt_frame, regs=%p frame=%p newsp=%lx\n",
799 if (show_unhandled_signals)
800 printk_ratelimited(regs->msr & MSR_64BIT ? fmt64 : fmt32,
801 current->comm, current->pid, "setup_rt_frame",
802 (long)frame, regs->nip, regs->link);
804 force_sigsegv(signr, current);