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 /* Don't allow reserved mode. */
420 if (MSR_TM_RESV(msr
))
423 /* pull in MSR TM from user context */
424 regs
->msr
= (regs
->msr
& ~MSR_TS_MASK
) | (msr
& MSR_TS_MASK
);
426 /* pull in MSR LE from user context */
427 regs
->msr
= (regs
->msr
& ~MSR_LE
) | (msr
& MSR_LE
);
429 /* The following non-GPR non-FPR non-VR state is also checkpointed: */
430 err
|= __get_user(regs
->ctr
, &tm_sc
->gp_regs
[PT_CTR
]);
431 err
|= __get_user(regs
->link
, &tm_sc
->gp_regs
[PT_LNK
]);
432 err
|= __get_user(regs
->xer
, &tm_sc
->gp_regs
[PT_XER
]);
433 err
|= __get_user(regs
->ccr
, &tm_sc
->gp_regs
[PT_CCR
]);
434 err
|= __get_user(current
->thread
.ckpt_regs
.ctr
,
435 &sc
->gp_regs
[PT_CTR
]);
436 err
|= __get_user(current
->thread
.ckpt_regs
.link
,
437 &sc
->gp_regs
[PT_LNK
]);
438 err
|= __get_user(current
->thread
.ckpt_regs
.xer
,
439 &sc
->gp_regs
[PT_XER
]);
440 err
|= __get_user(current
->thread
.ckpt_regs
.ccr
,
441 &sc
->gp_regs
[PT_CCR
]);
443 /* These regs are not checkpointed; they can go in 'regs'. */
444 err
|= __get_user(regs
->trap
, &sc
->gp_regs
[PT_TRAP
]);
445 err
|= __get_user(regs
->dar
, &sc
->gp_regs
[PT_DAR
]);
446 err
|= __get_user(regs
->dsisr
, &sc
->gp_regs
[PT_DSISR
]);
447 err
|= __get_user(regs
->result
, &sc
->gp_regs
[PT_RESULT
]);
450 * Do this before updating the thread state in
451 * current->thread.fpr/vr. That way, if we get preempted
452 * and another task grabs the FPU/Altivec, it won't be
453 * tempted to save the current CPU state into the thread_struct
454 * and corrupt what we are writing there.
456 discard_lazy_cpu_state();
459 * Force reload of FP/VEC.
460 * This has to be done before copying stuff into current->thread.fpr/vr
461 * for the reasons explained in the previous comment.
463 regs
->msr
&= ~(MSR_FP
| MSR_FE0
| MSR_FE1
| MSR_VEC
| MSR_VSX
);
465 #ifdef CONFIG_ALTIVEC
466 err
|= __get_user(v_regs
, &sc
->v_regs
);
467 err
|= __get_user(tm_v_regs
, &tm_sc
->v_regs
);
470 if (v_regs
&& !access_ok(VERIFY_READ
, v_regs
, 34 * sizeof(vector128
)))
472 if (tm_v_regs
&& !access_ok(VERIFY_READ
,
473 tm_v_regs
, 34 * sizeof(vector128
)))
475 /* Copy 33 vec registers (vr0..31 and vscr) from the stack */
476 if (v_regs
!= 0 && tm_v_regs
!= 0 && (msr
& MSR_VEC
) != 0) {
477 err
|= __copy_from_user(current
->thread
.vr
, v_regs
,
478 33 * sizeof(vector128
));
479 err
|= __copy_from_user(current
->thread
.transact_vr
, tm_v_regs
,
480 33 * sizeof(vector128
));
482 else if (current
->thread
.used_vr
) {
483 memset(current
->thread
.vr
, 0, 33 * sizeof(vector128
));
484 memset(current
->thread
.transact_vr
, 0, 33 * sizeof(vector128
));
486 /* Always get VRSAVE back */
487 if (v_regs
!= 0 && tm_v_regs
!= 0) {
488 err
|= __get_user(current
->thread
.vrsave
,
489 (u32 __user
*)&v_regs
[33]);
490 err
|= __get_user(current
->thread
.transact_vrsave
,
491 (u32 __user
*)&tm_v_regs
[33]);
494 current
->thread
.vrsave
= 0;
495 current
->thread
.transact_vrsave
= 0;
497 #endif /* CONFIG_ALTIVEC */
498 /* restore floating point */
499 err
|= copy_fpr_from_user(current
, &sc
->fp_regs
);
500 err
|= copy_transact_fpr_from_user(current
, &tm_sc
->fp_regs
);
503 * Get additional VSX data. Update v_regs to point after the
504 * VMX data. Copy VSX low doubleword from userspace to local
505 * buffer for formatting, then into the taskstruct.
507 if (v_regs
&& ((msr
& MSR_VSX
) != 0)) {
508 v_regs
+= ELF_NVRREG
;
509 tm_v_regs
+= ELF_NVRREG
;
510 err
|= copy_vsx_from_user(current
, v_regs
);
511 err
|= copy_transact_vsx_from_user(current
, tm_v_regs
);
513 for (i
= 0; i
< 32 ; i
++) {
514 current
->thread
.fpr
[i
][TS_VSRLOWOFFSET
] = 0;
515 current
->thread
.transact_fpr
[i
][TS_VSRLOWOFFSET
] = 0;
520 /* Make sure the transaction is marked as failed */
521 current
->thread
.tm_texasr
|= TEXASR_FS
;
522 /* This loads the checkpointed FP/VEC state, if used */
523 tm_recheckpoint(¤t
->thread
, msr
);
525 /* This loads the speculative FP/VEC state, if used */
527 do_load_up_transact_fpu(¤t
->thread
);
528 regs
->msr
|= (MSR_FP
| current
->thread
.fpexc_mode
);
530 #ifdef CONFIG_ALTIVEC
532 do_load_up_transact_altivec(¤t
->thread
);
533 regs
->msr
|= MSR_VEC
;
542 * Setup the trampoline code on the stack
544 static long setup_trampoline(unsigned int syscall
, unsigned int __user
*tramp
)
549 /* addi r1, r1, __SIGNAL_FRAMESIZE # Pop the dummy stackframe */
550 err
|= __put_user(0x38210000UL
| (__SIGNAL_FRAMESIZE
& 0xffff), &tramp
[0]);
551 /* li r0, __NR_[rt_]sigreturn| */
552 err
|= __put_user(0x38000000UL
| (syscall
& 0xffff), &tramp
[1]);
554 err
|= __put_user(0x44000002UL
, &tramp
[2]);
556 /* Minimal traceback info */
557 for (i
=TRAMP_TRACEBACK
; i
< TRAMP_SIZE
;i
++)
558 err
|= __put_user(0, &tramp
[i
]);
561 flush_icache_range((unsigned long) &tramp
[0],
562 (unsigned long) &tramp
[TRAMP_SIZE
]);
568 * Userspace code may pass a ucontext which doesn't include VSX added
569 * at the end. We need to check for this case.
571 #define UCONTEXTSIZEWITHOUTVSX \
572 (sizeof(struct ucontext) - 32*sizeof(long))
575 * Handle {get,set,swap}_context operations
577 int sys_swapcontext(struct ucontext __user
*old_ctx
,
578 struct ucontext __user
*new_ctx
,
579 long ctx_size
, long r6
, long r7
, long r8
, struct pt_regs
*regs
)
583 unsigned long new_msr
= 0;
584 int ctx_has_vsx_region
= 0;
587 get_user(new_msr
, &new_ctx
->uc_mcontext
.gp_regs
[PT_MSR
]))
590 * Check that the context is not smaller than the original
591 * size (with VMX but without VSX)
593 if (ctx_size
< UCONTEXTSIZEWITHOUTVSX
)
596 * If the new context state sets the MSR VSX bits but
597 * it doesn't provide VSX state.
599 if ((ctx_size
< sizeof(struct ucontext
)) &&
602 /* Does the context have enough room to store VSX data? */
603 if (ctx_size
>= sizeof(struct ucontext
))
604 ctx_has_vsx_region
= 1;
606 if (old_ctx
!= NULL
) {
607 if (!access_ok(VERIFY_WRITE
, old_ctx
, ctx_size
)
608 || setup_sigcontext(&old_ctx
->uc_mcontext
, regs
, 0, NULL
, 0,
610 || __copy_to_user(&old_ctx
->uc_sigmask
,
611 ¤t
->blocked
, sizeof(sigset_t
)))
616 if (!access_ok(VERIFY_READ
, new_ctx
, ctx_size
)
617 || __get_user(tmp
, (u8 __user
*) new_ctx
)
618 || __get_user(tmp
, (u8 __user
*) new_ctx
+ ctx_size
- 1))
622 * If we get a fault copying the context into the kernel's
623 * image of the user's registers, we can't just return -EFAULT
624 * because the user's registers will be corrupted. For instance
625 * the NIP value may have been updated but not some of the
626 * other registers. Given that we have done the access_ok
627 * and successfully read the first and last bytes of the region
628 * above, this should only happen in an out-of-memory situation
629 * or if another thread unmaps the region containing the context.
630 * We kill the task with a SIGSEGV in this situation.
633 if (__copy_from_user(&set
, &new_ctx
->uc_sigmask
, sizeof(set
)))
635 set_current_blocked(&set
);
636 if (restore_sigcontext(regs
, NULL
, 0, &new_ctx
->uc_mcontext
))
639 /* This returns like rt_sigreturn */
640 set_thread_flag(TIF_RESTOREALL
);
646 * Do a signal return; undo the signal stack.
649 int sys_rt_sigreturn(unsigned long r3
, unsigned long r4
, unsigned long r5
,
650 unsigned long r6
, unsigned long r7
, unsigned long r8
,
651 struct pt_regs
*regs
)
653 struct ucontext __user
*uc
= (struct ucontext __user
*)regs
->gpr
[1];
655 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
659 /* Always make any pending restarted system calls return -EINTR */
660 current_thread_info()->restart_block
.fn
= do_no_restart_syscall
;
662 if (!access_ok(VERIFY_READ
, uc
, sizeof(*uc
)))
665 if (__copy_from_user(&set
, &uc
->uc_sigmask
, sizeof(set
)))
667 set_current_blocked(&set
);
668 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
669 if (__get_user(msr
, &uc
->uc_mcontext
.gp_regs
[PT_MSR
]))
671 if (MSR_TM_ACTIVE(msr
)) {
672 /* We recheckpoint on return. */
673 struct ucontext __user
*uc_transact
;
674 if (__get_user(uc_transact
, &uc
->uc_link
))
676 if (restore_tm_sigcontexts(regs
, &uc
->uc_mcontext
,
677 &uc_transact
->uc_mcontext
))
681 /* Fall through, for non-TM restore */
683 if (restore_sigcontext(regs
, NULL
, 1, &uc
->uc_mcontext
))
686 if (restore_altstack(&uc
->uc_stack
))
689 set_thread_flag(TIF_RESTOREALL
);
694 printk("badframe in sys_rt_sigreturn, regs=%p uc=%p &uc->uc_mcontext=%p\n",
695 regs
, uc
, &uc
->uc_mcontext
);
697 if (show_unhandled_signals
)
698 printk_ratelimited(regs
->msr
& MSR_64BIT
? fmt64
: fmt32
,
699 current
->comm
, current
->pid
, "rt_sigreturn",
700 (long)uc
, regs
->nip
, regs
->link
);
702 force_sig(SIGSEGV
, current
);
706 int handle_rt_signal64(int signr
, struct k_sigaction
*ka
, siginfo_t
*info
,
707 sigset_t
*set
, struct pt_regs
*regs
)
709 /* Handler is *really* a pointer to the function descriptor for
710 * the signal routine. The first entry in the function
711 * descriptor is the entry address of signal and the second
712 * entry is the TOC value we need to use.
714 func_descr_t __user
*funct_desc_ptr
;
715 struct rt_sigframe __user
*frame
;
716 unsigned long newsp
= 0;
719 frame
= get_sigframe(ka
, get_tm_stackpointer(regs
), sizeof(*frame
), 0);
720 if (unlikely(frame
== NULL
))
723 err
|= __put_user(&frame
->info
, &frame
->pinfo
);
724 err
|= __put_user(&frame
->uc
, &frame
->puc
);
725 err
|= copy_siginfo_to_user(&frame
->info
, info
);
729 /* Create the ucontext. */
730 err
|= __put_user(0, &frame
->uc
.uc_flags
);
731 err
|= __save_altstack(&frame
->uc
.uc_stack
, regs
->gpr
[1]);
732 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
733 if (MSR_TM_ACTIVE(regs
->msr
)) {
734 /* The ucontext_t passed to userland points to the second
735 * ucontext_t (for transactional state) with its uc_link ptr.
737 err
|= __put_user(&frame
->uc_transact
, &frame
->uc
.uc_link
);
738 err
|= setup_tm_sigcontexts(&frame
->uc
.uc_mcontext
,
739 &frame
->uc_transact
.uc_mcontext
,
742 (unsigned long)ka
->sa
.sa_handler
);
746 err
|= __put_user(0, &frame
->uc
.uc_link
);
747 err
|= setup_sigcontext(&frame
->uc
.uc_mcontext
, regs
, signr
,
748 NULL
, (unsigned long)ka
->sa
.sa_handler
,
751 err
|= __copy_to_user(&frame
->uc
.uc_sigmask
, set
, sizeof(*set
));
755 /* Make sure signal handler doesn't get spurious FP exceptions */
756 current
->thread
.fpscr
.val
= 0;
757 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
758 /* Remove TM bits from thread's MSR. The MSR in the sigcontext
759 * just indicates to userland that we were doing a transaction, but we
760 * don't want to return in transactional state:
762 regs
->msr
&= ~MSR_TS_MASK
;
765 /* Set up to return from userspace. */
766 if (vdso64_rt_sigtramp
&& current
->mm
->context
.vdso_base
) {
767 regs
->link
= current
->mm
->context
.vdso_base
+ vdso64_rt_sigtramp
;
769 err
|= setup_trampoline(__NR_rt_sigreturn
, &frame
->tramp
[0]);
772 regs
->link
= (unsigned long) &frame
->tramp
[0];
774 funct_desc_ptr
= (func_descr_t __user
*) ka
->sa
.sa_handler
;
776 /* Allocate a dummy caller frame for the signal handler. */
777 newsp
= ((unsigned long)frame
) - __SIGNAL_FRAMESIZE
;
778 err
|= put_user(regs
->gpr
[1], (unsigned long __user
*)newsp
);
780 /* Set up "regs" so we "return" to the signal handler. */
781 err
|= get_user(regs
->nip
, &funct_desc_ptr
->entry
);
782 /* enter the signal handler in big-endian mode */
783 regs
->msr
&= ~MSR_LE
;
784 regs
->gpr
[1] = newsp
;
785 err
|= get_user(regs
->gpr
[2], &funct_desc_ptr
->toc
);
786 regs
->gpr
[3] = signr
;
788 if (ka
->sa
.sa_flags
& SA_SIGINFO
) {
789 err
|= get_user(regs
->gpr
[4], (unsigned long __user
*)&frame
->pinfo
);
790 err
|= get_user(regs
->gpr
[5], (unsigned long __user
*)&frame
->puc
);
791 regs
->gpr
[6] = (unsigned long) frame
;
793 regs
->gpr
[4] = (unsigned long)&frame
->uc
.uc_mcontext
;
802 printk("badframe in setup_rt_frame, regs=%p frame=%p newsp=%lx\n",
805 if (show_unhandled_signals
)
806 printk_ratelimited(regs
->msr
& MSR_64BIT
? fmt64
: fmt32
,
807 current
->comm
, current
->pid
, "setup_rt_frame",
808 (long)frame
, regs
->nip
, regs
->link
);
810 force_sigsegv(signr
, current
);