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git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - arch/powerpc/kernel/signal_64.c
3 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
5 * Derived from "arch/i386/kernel/signal.c"
6 * Copyright (C) 1991, 1992 Linus Torvalds
7 * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
15 #include <linux/sched.h>
17 #include <linux/smp.h>
18 #include <linux/kernel.h>
19 #include <linux/signal.h>
20 #include <linux/errno.h>
21 #include <linux/wait.h>
22 #include <linux/unistd.h>
23 #include <linux/stddef.h>
24 #include <linux/elf.h>
25 #include <linux/ptrace.h>
26 #include <linux/ratelimit.h>
28 #include <asm/sigcontext.h>
29 #include <asm/ucontext.h>
30 #include <asm/uaccess.h>
31 #include <asm/pgtable.h>
32 #include <asm/unistd.h>
33 #include <asm/cacheflush.h>
34 #include <asm/syscalls.h>
36 #include <asm/switch_to.h>
42 #define GP_REGS_SIZE min(sizeof(elf_gregset_t), sizeof(struct pt_regs))
43 #define FP_REGS_SIZE sizeof(elf_fpregset_t)
45 #define TRAMP_TRACEBACK 3
49 * When we have signals to deliver, we set up on the user stack,
50 * going down from the original stack pointer:
51 * 1) a rt_sigframe struct which contains the ucontext
52 * 2) a gap of __SIGNAL_FRAMESIZE bytes which acts as a dummy caller
53 * frame for the signal handler.
57 /* sys_rt_sigreturn requires the ucontext be the first field */
59 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
60 struct ucontext uc_transact
;
62 unsigned long _unused
[2];
63 unsigned int tramp
[TRAMP_SIZE
];
64 struct siginfo __user
*pinfo
;
67 /* New 64 bit little-endian ABI allows redzone of 512 bytes below sp */
68 char abigap
[USER_REDZONE_SIZE
];
69 } __attribute__ ((aligned (16)));
71 static const char fmt32
[] = KERN_INFO \
72 "%s[%d]: bad frame in %s: %08lx nip %08lx lr %08lx\n";
73 static const char fmt64
[] = KERN_INFO \
74 "%s[%d]: bad frame in %s: %016lx nip %016lx lr %016lx\n";
77 * This computes a quad word aligned pointer inside the vmx_reserve array
78 * element. For historical reasons sigcontext might not be quad word aligned,
79 * but the location we write the VMX regs to must be. See the comment in
80 * sigcontext for more detail.
83 static elf_vrreg_t __user
*sigcontext_vmx_regs(struct sigcontext __user
*sc
)
85 return (elf_vrreg_t __user
*) (((unsigned long)sc
->vmx_reserve
+ 15) & ~0xful
);
90 * Set up the sigcontext for the signal frame.
93 static long setup_sigcontext(struct sigcontext __user
*sc
, struct pt_regs
*regs
,
94 int signr
, sigset_t
*set
, unsigned long handler
,
95 int ctx_has_vsx_region
)
97 /* When CONFIG_ALTIVEC is set, we _always_ setup v_regs even if the
98 * process never used altivec yet (MSR_VEC is zero in pt_regs of
99 * the context). This is very important because we must ensure we
100 * don't lose the VRSAVE content that may have been set prior to
101 * the process doing its first vector operation
102 * Userland shall check AT_HWCAP to know whether it can rely on the
103 * v_regs pointer or not
105 #ifdef CONFIG_ALTIVEC
106 elf_vrreg_t __user
*v_regs
= sigcontext_vmx_regs(sc
);
107 unsigned long vrsave
;
109 unsigned long msr
= regs
->msr
;
112 #ifdef CONFIG_ALTIVEC
113 err
|= __put_user(v_regs
, &sc
->v_regs
);
115 /* save altivec registers */
116 if (current
->thread
.used_vr
) {
117 flush_altivec_to_thread(current
);
118 /* Copy 33 vec registers (vr0..31 and vscr) to the stack */
119 err
|= __copy_to_user(v_regs
, ¤t
->thread
.vr_state
,
120 33 * sizeof(vector128
));
121 /* set MSR_VEC in the MSR value in the frame to indicate that sc->v_reg)
122 * contains valid data.
126 /* We always copy to/from vrsave, it's 0 if we don't have or don't
130 if (cpu_has_feature(CPU_FTR_ALTIVEC
)) {
131 vrsave
= mfspr(SPRN_VRSAVE
);
132 current
->thread
.vrsave
= vrsave
;
135 err
|= __put_user(vrsave
, (u32 __user
*)&v_regs
[33]);
136 #else /* CONFIG_ALTIVEC */
137 err
|= __put_user(0, &sc
->v_regs
);
138 #endif /* CONFIG_ALTIVEC */
139 flush_fp_to_thread(current
);
140 /* copy fpr regs and fpscr */
141 err
|= copy_fpr_to_user(&sc
->fp_regs
, current
);
144 * Clear the MSR VSX bit to indicate there is no valid state attached
145 * to this context, except in the specific case below where we set it.
150 * Copy VSX low doubleword to local buffer for formatting,
151 * then out to userspace. Update v_regs to point after the
154 if (current
->thread
.used_vsr
&& ctx_has_vsx_region
) {
155 flush_vsx_to_thread(current
);
156 v_regs
+= ELF_NVRREG
;
157 err
|= copy_vsx_to_user(v_regs
, current
);
158 /* set MSR_VSX in the MSR value in the frame to
159 * indicate that sc->vs_reg) contains valid data.
163 #endif /* CONFIG_VSX */
164 err
|= __put_user(&sc
->gp_regs
, &sc
->regs
);
165 WARN_ON(!FULL_REGS(regs
));
166 err
|= __copy_to_user(&sc
->gp_regs
, regs
, GP_REGS_SIZE
);
167 err
|= __put_user(msr
, &sc
->gp_regs
[PT_MSR
]);
168 err
|= __put_user(signr
, &sc
->signal
);
169 err
|= __put_user(handler
, &sc
->handler
);
171 err
|= __put_user(set
->sig
[0], &sc
->oldmask
);
176 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
178 * As above, but Transactional Memory is in use, so deliver sigcontexts
179 * containing checkpointed and transactional register states.
181 * To do this, we treclaim (done before entering here) to gather both sets of
182 * registers and set up the 'normal' sigcontext registers with rolled-back
183 * register values such that a simple signal handler sees a correct
184 * checkpointed register state. If interested, a TM-aware sighandler can
185 * examine the transactional registers in the 2nd sigcontext to determine the
186 * real origin of the signal.
188 static long setup_tm_sigcontexts(struct sigcontext __user
*sc
,
189 struct sigcontext __user
*tm_sc
,
190 struct pt_regs
*regs
,
191 int signr
, sigset_t
*set
, unsigned long handler
)
193 /* When CONFIG_ALTIVEC is set, we _always_ setup v_regs even if the
194 * process never used altivec yet (MSR_VEC is zero in pt_regs of
195 * the context). This is very important because we must ensure we
196 * don't lose the VRSAVE content that may have been set prior to
197 * the process doing its first vector operation
198 * Userland shall check AT_HWCAP to know wether it can rely on the
199 * v_regs pointer or not.
201 #ifdef CONFIG_ALTIVEC
202 elf_vrreg_t __user
*v_regs
= sigcontext_vmx_regs(sc
);
203 elf_vrreg_t __user
*tm_v_regs
= sigcontext_vmx_regs(tm_sc
);
205 unsigned long msr
= regs
->msr
;
208 BUG_ON(!MSR_TM_ACTIVE(regs
->msr
));
210 /* Remove TM bits from thread's MSR. The MSR in the sigcontext
211 * just indicates to userland that we were doing a transaction, but we
212 * don't want to return in transactional state. This also ensures
213 * that flush_fp_to_thread won't set TIF_RESTORE_TM again.
215 regs
->msr
&= ~MSR_TS_MASK
;
217 flush_fp_to_thread(current
);
219 #ifdef CONFIG_ALTIVEC
220 err
|= __put_user(v_regs
, &sc
->v_regs
);
221 err
|= __put_user(tm_v_regs
, &tm_sc
->v_regs
);
223 /* save altivec registers */
224 if (current
->thread
.used_vr
) {
225 flush_altivec_to_thread(current
);
226 /* Copy 33 vec registers (vr0..31 and vscr) to the stack */
227 err
|= __copy_to_user(v_regs
, ¤t
->thread
.vr_state
,
228 33 * sizeof(vector128
));
229 /* If VEC was enabled there are transactional VRs valid too,
230 * else they're a copy of the checkpointed VRs.
233 err
|= __copy_to_user(tm_v_regs
,
234 ¤t
->thread
.transact_vr
,
235 33 * sizeof(vector128
));
237 err
|= __copy_to_user(tm_v_regs
,
238 ¤t
->thread
.vr_state
,
239 33 * sizeof(vector128
));
241 /* set MSR_VEC in the MSR value in the frame to indicate
242 * that sc->v_reg contains valid data.
246 /* We always copy to/from vrsave, it's 0 if we don't have or don't
249 if (cpu_has_feature(CPU_FTR_ALTIVEC
))
250 current
->thread
.vrsave
= mfspr(SPRN_VRSAVE
);
251 err
|= __put_user(current
->thread
.vrsave
, (u32 __user
*)&v_regs
[33]);
253 err
|= __put_user(current
->thread
.transact_vrsave
,
254 (u32 __user
*)&tm_v_regs
[33]);
256 err
|= __put_user(current
->thread
.vrsave
,
257 (u32 __user
*)&tm_v_regs
[33]);
259 #else /* CONFIG_ALTIVEC */
260 err
|= __put_user(0, &sc
->v_regs
);
261 err
|= __put_user(0, &tm_sc
->v_regs
);
262 #endif /* CONFIG_ALTIVEC */
264 /* copy fpr regs and fpscr */
265 err
|= copy_fpr_to_user(&sc
->fp_regs
, current
);
267 err
|= copy_transact_fpr_to_user(&tm_sc
->fp_regs
, current
);
269 err
|= copy_fpr_to_user(&tm_sc
->fp_regs
, current
);
273 * Copy VSX low doubleword to local buffer for formatting,
274 * then out to userspace. Update v_regs to point after the
277 if (current
->thread
.used_vsr
) {
278 flush_vsx_to_thread(current
);
279 v_regs
+= ELF_NVRREG
;
280 tm_v_regs
+= ELF_NVRREG
;
282 err
|= copy_vsx_to_user(v_regs
, current
);
285 err
|= copy_transact_vsx_to_user(tm_v_regs
, current
);
287 err
|= copy_vsx_to_user(tm_v_regs
, current
);
289 /* set MSR_VSX in the MSR value in the frame to
290 * indicate that sc->vs_reg) contains valid data.
294 #endif /* CONFIG_VSX */
296 err
|= __put_user(&sc
->gp_regs
, &sc
->regs
);
297 err
|= __put_user(&tm_sc
->gp_regs
, &tm_sc
->regs
);
298 WARN_ON(!FULL_REGS(regs
));
299 err
|= __copy_to_user(&tm_sc
->gp_regs
, regs
, GP_REGS_SIZE
);
300 err
|= __copy_to_user(&sc
->gp_regs
,
301 ¤t
->thread
.ckpt_regs
, GP_REGS_SIZE
);
302 err
|= __put_user(msr
, &tm_sc
->gp_regs
[PT_MSR
]);
303 err
|= __put_user(msr
, &sc
->gp_regs
[PT_MSR
]);
304 err
|= __put_user(signr
, &sc
->signal
);
305 err
|= __put_user(handler
, &sc
->handler
);
307 err
|= __put_user(set
->sig
[0], &sc
->oldmask
);
314 * Restore the sigcontext from the signal frame.
317 static long restore_sigcontext(struct pt_regs
*regs
, sigset_t
*set
, int sig
,
318 struct sigcontext __user
*sc
)
320 #ifdef CONFIG_ALTIVEC
321 elf_vrreg_t __user
*v_regs
;
323 unsigned long err
= 0;
324 unsigned long save_r13
= 0;
330 /* If this is not a signal return, we preserve the TLS in r13 */
332 save_r13
= regs
->gpr
[13];
335 err
|= __copy_from_user(regs
->gpr
, sc
->gp_regs
, sizeof(regs
->gpr
));
336 err
|= __get_user(regs
->nip
, &sc
->gp_regs
[PT_NIP
]);
337 /* get MSR separately, transfer the LE bit if doing signal return */
338 err
|= __get_user(msr
, &sc
->gp_regs
[PT_MSR
]);
340 regs
->msr
= (regs
->msr
& ~MSR_LE
) | (msr
& MSR_LE
);
341 err
|= __get_user(regs
->orig_gpr3
, &sc
->gp_regs
[PT_ORIG_R3
]);
342 err
|= __get_user(regs
->ctr
, &sc
->gp_regs
[PT_CTR
]);
343 err
|= __get_user(regs
->link
, &sc
->gp_regs
[PT_LNK
]);
344 err
|= __get_user(regs
->xer
, &sc
->gp_regs
[PT_XER
]);
345 err
|= __get_user(regs
->ccr
, &sc
->gp_regs
[PT_CCR
]);
348 err
|= __get_user(regs
->dar
, &sc
->gp_regs
[PT_DAR
]);
349 err
|= __get_user(regs
->dsisr
, &sc
->gp_regs
[PT_DSISR
]);
350 err
|= __get_user(regs
->result
, &sc
->gp_regs
[PT_RESULT
]);
353 regs
->gpr
[13] = save_r13
;
355 err
|= __get_user(set
->sig
[0], &sc
->oldmask
);
358 * Force reload of FP/VEC.
359 * This has to be done before copying stuff into current->thread.fpr/vr
360 * for the reasons explained in the previous comment.
362 regs
->msr
&= ~(MSR_FP
| MSR_FE0
| MSR_FE1
| MSR_VEC
| MSR_VSX
);
364 #ifdef CONFIG_ALTIVEC
365 err
|= __get_user(v_regs
, &sc
->v_regs
);
368 if (v_regs
&& !access_ok(VERIFY_READ
, v_regs
, 34 * sizeof(vector128
)))
370 /* Copy 33 vec registers (vr0..31 and vscr) from the stack */
371 if (v_regs
!= NULL
&& (msr
& MSR_VEC
) != 0)
372 err
|= __copy_from_user(¤t
->thread
.vr_state
, v_regs
,
373 33 * sizeof(vector128
));
374 else if (current
->thread
.used_vr
)
375 memset(¤t
->thread
.vr_state
, 0, 33 * sizeof(vector128
));
376 /* Always get VRSAVE back */
378 err
|= __get_user(current
->thread
.vrsave
, (u32 __user
*)&v_regs
[33]);
380 current
->thread
.vrsave
= 0;
381 if (cpu_has_feature(CPU_FTR_ALTIVEC
))
382 mtspr(SPRN_VRSAVE
, current
->thread
.vrsave
);
383 #endif /* CONFIG_ALTIVEC */
384 /* restore floating point */
385 err
|= copy_fpr_from_user(current
, &sc
->fp_regs
);
388 * Get additional VSX data. Update v_regs to point after the
389 * VMX data. Copy VSX low doubleword from userspace to local
390 * buffer for formatting, then into the taskstruct.
392 v_regs
+= ELF_NVRREG
;
393 if ((msr
& MSR_VSX
) != 0)
394 err
|= copy_vsx_from_user(current
, v_regs
);
396 for (i
= 0; i
< 32 ; i
++)
397 current
->thread
.fp_state
.fpr
[i
][TS_VSRLOWOFFSET
] = 0;
402 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
404 * Restore the two sigcontexts from the frame of a transactional processes.
407 static long restore_tm_sigcontexts(struct pt_regs
*regs
,
408 struct sigcontext __user
*sc
,
409 struct sigcontext __user
*tm_sc
)
411 #ifdef CONFIG_ALTIVEC
412 elf_vrreg_t __user
*v_regs
, *tm_v_regs
;
414 unsigned long err
= 0;
420 err
|= __copy_from_user(regs
->gpr
, tm_sc
->gp_regs
, sizeof(regs
->gpr
));
421 err
|= __copy_from_user(¤t
->thread
.ckpt_regs
, sc
->gp_regs
,
425 * TFHAR is restored from the checkpointed 'wound-back' ucontext's NIP.
426 * TEXASR was set by the signal delivery reclaim, as was TFIAR.
427 * Users doing anything abhorrent like thread-switching w/ signals for
428 * TM-Suspended code will have to back TEXASR/TFIAR up themselves.
429 * For the case of getting a signal and simply returning from it,
430 * we don't need to re-copy them here.
432 err
|= __get_user(regs
->nip
, &tm_sc
->gp_regs
[PT_NIP
]);
433 err
|= __get_user(current
->thread
.tm_tfhar
, &sc
->gp_regs
[PT_NIP
]);
435 /* get MSR separately, transfer the LE bit if doing signal return */
436 err
|= __get_user(msr
, &sc
->gp_regs
[PT_MSR
]);
437 /* Don't allow reserved mode. */
438 if (MSR_TM_RESV(msr
))
441 /* pull in MSR TM from user context */
442 regs
->msr
= (regs
->msr
& ~MSR_TS_MASK
) | (msr
& MSR_TS_MASK
);
444 /* pull in MSR LE from user context */
445 regs
->msr
= (regs
->msr
& ~MSR_LE
) | (msr
& MSR_LE
);
447 /* The following non-GPR non-FPR non-VR state is also checkpointed: */
448 err
|= __get_user(regs
->ctr
, &tm_sc
->gp_regs
[PT_CTR
]);
449 err
|= __get_user(regs
->link
, &tm_sc
->gp_regs
[PT_LNK
]);
450 err
|= __get_user(regs
->xer
, &tm_sc
->gp_regs
[PT_XER
]);
451 err
|= __get_user(regs
->ccr
, &tm_sc
->gp_regs
[PT_CCR
]);
452 err
|= __get_user(current
->thread
.ckpt_regs
.ctr
,
453 &sc
->gp_regs
[PT_CTR
]);
454 err
|= __get_user(current
->thread
.ckpt_regs
.link
,
455 &sc
->gp_regs
[PT_LNK
]);
456 err
|= __get_user(current
->thread
.ckpt_regs
.xer
,
457 &sc
->gp_regs
[PT_XER
]);
458 err
|= __get_user(current
->thread
.ckpt_regs
.ccr
,
459 &sc
->gp_regs
[PT_CCR
]);
461 /* These regs are not checkpointed; they can go in 'regs'. */
462 err
|= __get_user(regs
->trap
, &sc
->gp_regs
[PT_TRAP
]);
463 err
|= __get_user(regs
->dar
, &sc
->gp_regs
[PT_DAR
]);
464 err
|= __get_user(regs
->dsisr
, &sc
->gp_regs
[PT_DSISR
]);
465 err
|= __get_user(regs
->result
, &sc
->gp_regs
[PT_RESULT
]);
468 * Force reload of FP/VEC.
469 * This has to be done before copying stuff into current->thread.fpr/vr
470 * for the reasons explained in the previous comment.
472 regs
->msr
&= ~(MSR_FP
| MSR_FE0
| MSR_FE1
| MSR_VEC
| MSR_VSX
);
474 #ifdef CONFIG_ALTIVEC
475 err
|= __get_user(v_regs
, &sc
->v_regs
);
476 err
|= __get_user(tm_v_regs
, &tm_sc
->v_regs
);
479 if (v_regs
&& !access_ok(VERIFY_READ
, v_regs
, 34 * sizeof(vector128
)))
481 if (tm_v_regs
&& !access_ok(VERIFY_READ
,
482 tm_v_regs
, 34 * sizeof(vector128
)))
484 /* Copy 33 vec registers (vr0..31 and vscr) from the stack */
485 if (v_regs
!= NULL
&& tm_v_regs
!= NULL
&& (msr
& MSR_VEC
) != 0) {
486 err
|= __copy_from_user(¤t
->thread
.vr_state
, v_regs
,
487 33 * sizeof(vector128
));
488 err
|= __copy_from_user(¤t
->thread
.transact_vr
, tm_v_regs
,
489 33 * sizeof(vector128
));
491 else if (current
->thread
.used_vr
) {
492 memset(¤t
->thread
.vr_state
, 0, 33 * sizeof(vector128
));
493 memset(¤t
->thread
.transact_vr
, 0, 33 * sizeof(vector128
));
495 /* Always get VRSAVE back */
496 if (v_regs
!= NULL
&& tm_v_regs
!= NULL
) {
497 err
|= __get_user(current
->thread
.vrsave
,
498 (u32 __user
*)&v_regs
[33]);
499 err
|= __get_user(current
->thread
.transact_vrsave
,
500 (u32 __user
*)&tm_v_regs
[33]);
503 current
->thread
.vrsave
= 0;
504 current
->thread
.transact_vrsave
= 0;
506 if (cpu_has_feature(CPU_FTR_ALTIVEC
))
507 mtspr(SPRN_VRSAVE
, current
->thread
.vrsave
);
508 #endif /* CONFIG_ALTIVEC */
509 /* restore floating point */
510 err
|= copy_fpr_from_user(current
, &sc
->fp_regs
);
511 err
|= copy_transact_fpr_from_user(current
, &tm_sc
->fp_regs
);
514 * Get additional VSX data. Update v_regs to point after the
515 * VMX data. Copy VSX low doubleword from userspace to local
516 * buffer for formatting, then into the taskstruct.
518 if (v_regs
&& ((msr
& MSR_VSX
) != 0)) {
519 v_regs
+= ELF_NVRREG
;
520 tm_v_regs
+= ELF_NVRREG
;
521 err
|= copy_vsx_from_user(current
, v_regs
);
522 err
|= copy_transact_vsx_from_user(current
, tm_v_regs
);
524 for (i
= 0; i
< 32 ; i
++) {
525 current
->thread
.fp_state
.fpr
[i
][TS_VSRLOWOFFSET
] = 0;
526 current
->thread
.transact_fp
.fpr
[i
][TS_VSRLOWOFFSET
] = 0;
531 /* Make sure the transaction is marked as failed */
532 current
->thread
.tm_texasr
|= TEXASR_FS
;
533 /* This loads the checkpointed FP/VEC state, if used */
534 tm_recheckpoint(¤t
->thread
, msr
);
536 /* This loads the speculative FP/VEC state, if used */
538 do_load_up_transact_fpu(¤t
->thread
);
539 regs
->msr
|= (MSR_FP
| current
->thread
.fpexc_mode
);
541 #ifdef CONFIG_ALTIVEC
543 do_load_up_transact_altivec(¤t
->thread
);
544 regs
->msr
|= MSR_VEC
;
553 * Setup the trampoline code on the stack
555 static long setup_trampoline(unsigned int syscall
, unsigned int __user
*tramp
)
560 /* addi r1, r1, __SIGNAL_FRAMESIZE # Pop the dummy stackframe */
561 err
|= __put_user(0x38210000UL
| (__SIGNAL_FRAMESIZE
& 0xffff), &tramp
[0]);
562 /* li r0, __NR_[rt_]sigreturn| */
563 err
|= __put_user(0x38000000UL
| (syscall
& 0xffff), &tramp
[1]);
565 err
|= __put_user(0x44000002UL
, &tramp
[2]);
567 /* Minimal traceback info */
568 for (i
=TRAMP_TRACEBACK
; i
< TRAMP_SIZE
;i
++)
569 err
|= __put_user(0, &tramp
[i
]);
572 flush_icache_range((unsigned long) &tramp
[0],
573 (unsigned long) &tramp
[TRAMP_SIZE
]);
579 * Userspace code may pass a ucontext which doesn't include VSX added
580 * at the end. We need to check for this case.
582 #define UCONTEXTSIZEWITHOUTVSX \
583 (sizeof(struct ucontext) - 32*sizeof(long))
586 * Handle {get,set,swap}_context operations
588 int sys_swapcontext(struct ucontext __user
*old_ctx
,
589 struct ucontext __user
*new_ctx
,
590 long ctx_size
, long r6
, long r7
, long r8
, struct pt_regs
*regs
)
594 unsigned long new_msr
= 0;
595 int ctx_has_vsx_region
= 0;
598 get_user(new_msr
, &new_ctx
->uc_mcontext
.gp_regs
[PT_MSR
]))
601 * Check that the context is not smaller than the original
602 * size (with VMX but without VSX)
604 if (ctx_size
< UCONTEXTSIZEWITHOUTVSX
)
607 * If the new context state sets the MSR VSX bits but
608 * it doesn't provide VSX state.
610 if ((ctx_size
< sizeof(struct ucontext
)) &&
613 /* Does the context have enough room to store VSX data? */
614 if (ctx_size
>= sizeof(struct ucontext
))
615 ctx_has_vsx_region
= 1;
617 if (old_ctx
!= NULL
) {
618 if (!access_ok(VERIFY_WRITE
, old_ctx
, ctx_size
)
619 || setup_sigcontext(&old_ctx
->uc_mcontext
, regs
, 0, NULL
, 0,
621 || __copy_to_user(&old_ctx
->uc_sigmask
,
622 ¤t
->blocked
, sizeof(sigset_t
)))
627 if (!access_ok(VERIFY_READ
, new_ctx
, ctx_size
)
628 || __get_user(tmp
, (u8 __user
*) new_ctx
)
629 || __get_user(tmp
, (u8 __user
*) new_ctx
+ ctx_size
- 1))
633 * If we get a fault copying the context into the kernel's
634 * image of the user's registers, we can't just return -EFAULT
635 * because the user's registers will be corrupted. For instance
636 * the NIP value may have been updated but not some of the
637 * other registers. Given that we have done the access_ok
638 * and successfully read the first and last bytes of the region
639 * above, this should only happen in an out-of-memory situation
640 * or if another thread unmaps the region containing the context.
641 * We kill the task with a SIGSEGV in this situation.
644 if (__copy_from_user(&set
, &new_ctx
->uc_sigmask
, sizeof(set
)))
646 set_current_blocked(&set
);
647 if (restore_sigcontext(regs
, NULL
, 0, &new_ctx
->uc_mcontext
))
650 /* This returns like rt_sigreturn */
651 set_thread_flag(TIF_RESTOREALL
);
657 * Do a signal return; undo the signal stack.
660 int sys_rt_sigreturn(unsigned long r3
, unsigned long r4
, unsigned long r5
,
661 unsigned long r6
, unsigned long r7
, unsigned long r8
,
662 struct pt_regs
*regs
)
664 struct ucontext __user
*uc
= (struct ucontext __user
*)regs
->gpr
[1];
666 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
670 /* Always make any pending restarted system calls return -EINTR */
671 current
->restart_block
.fn
= do_no_restart_syscall
;
673 if (!access_ok(VERIFY_READ
, uc
, sizeof(*uc
)))
676 if (__copy_from_user(&set
, &uc
->uc_sigmask
, sizeof(set
)))
678 set_current_blocked(&set
);
679 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
680 if (__get_user(msr
, &uc
->uc_mcontext
.gp_regs
[PT_MSR
]))
682 if (MSR_TM_ACTIVE(msr
)) {
683 /* We recheckpoint on return. */
684 struct ucontext __user
*uc_transact
;
685 if (__get_user(uc_transact
, &uc
->uc_link
))
687 if (restore_tm_sigcontexts(regs
, &uc
->uc_mcontext
,
688 &uc_transact
->uc_mcontext
))
692 /* Fall through, for non-TM restore */
694 if (restore_sigcontext(regs
, NULL
, 1, &uc
->uc_mcontext
))
697 if (restore_altstack(&uc
->uc_stack
))
700 set_thread_flag(TIF_RESTOREALL
);
704 if (show_unhandled_signals
)
705 printk_ratelimited(regs
->msr
& MSR_64BIT
? fmt64
: fmt32
,
706 current
->comm
, current
->pid
, "rt_sigreturn",
707 (long)uc
, regs
->nip
, regs
->link
);
709 force_sig(SIGSEGV
, current
);
713 int handle_rt_signal64(struct ksignal
*ksig
, sigset_t
*set
, struct pt_regs
*regs
)
715 struct rt_sigframe __user
*frame
;
716 unsigned long newsp
= 0;
719 frame
= get_sigframe(ksig
, 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
, &ksig
->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)ksig
->ka
.sa
.sa_handler
);
746 err
|= __put_user(0, &frame
->uc
.uc_link
);
747 err
|= setup_sigcontext(&frame
->uc
.uc_mcontext
, regs
, ksig
->sig
,
748 NULL
, (unsigned long)ksig
->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
.fp_state
.fpscr
= 0;
758 /* Set up to return from userspace. */
759 if (vdso64_rt_sigtramp
&& current
->mm
->context
.vdso_base
) {
760 regs
->link
= current
->mm
->context
.vdso_base
+ vdso64_rt_sigtramp
;
762 err
|= setup_trampoline(__NR_rt_sigreturn
, &frame
->tramp
[0]);
765 regs
->link
= (unsigned long) &frame
->tramp
[0];
768 /* Allocate a dummy caller frame for the signal handler. */
769 newsp
= ((unsigned long)frame
) - __SIGNAL_FRAMESIZE
;
770 err
|= put_user(regs
->gpr
[1], (unsigned long __user
*)newsp
);
772 /* Set up "regs" so we "return" to the signal handler. */
773 if (is_elf2_task()) {
774 regs
->nip
= (unsigned long) ksig
->ka
.sa
.sa_handler
;
775 regs
->gpr
[12] = regs
->nip
;
777 /* Handler is *really* a pointer to the function descriptor for
778 * the signal routine. The first entry in the function
779 * descriptor is the entry address of signal and the second
780 * entry is the TOC value we need to use.
782 func_descr_t __user
*funct_desc_ptr
=
783 (func_descr_t __user
*) ksig
->ka
.sa
.sa_handler
;
785 err
|= get_user(regs
->nip
, &funct_desc_ptr
->entry
);
786 err
|= get_user(regs
->gpr
[2], &funct_desc_ptr
->toc
);
789 /* enter the signal handler in native-endian mode */
790 regs
->msr
&= ~MSR_LE
;
791 regs
->msr
|= (MSR_KERNEL
& MSR_LE
);
792 regs
->gpr
[1] = newsp
;
793 regs
->gpr
[3] = ksig
->sig
;
795 if (ksig
->ka
.sa
.sa_flags
& SA_SIGINFO
) {
796 err
|= get_user(regs
->gpr
[4], (unsigned long __user
*)&frame
->pinfo
);
797 err
|= get_user(regs
->gpr
[5], (unsigned long __user
*)&frame
->puc
);
798 regs
->gpr
[6] = (unsigned long) frame
;
800 regs
->gpr
[4] = (unsigned long)&frame
->uc
.uc_mcontext
;
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
);