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befa10af0c1755e4f22858255897f1f52a232322
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>
38 #include <asm/asm-prototypes.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 /* New 64 bit little-endian ABI allows redzone of 512 bytes below sp */
69 char abigap
[USER_REDZONE_SIZE
];
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 * This computes a quad word aligned pointer inside the vmx_reserve array
79 * element. For historical reasons sigcontext might not be quad word aligned,
80 * but the location we write the VMX regs to must be. See the comment in
81 * sigcontext for more detail.
84 static elf_vrreg_t __user
*sigcontext_vmx_regs(struct sigcontext __user
*sc
)
86 return (elf_vrreg_t __user
*) (((unsigned long)sc
->vmx_reserve
+ 15) & ~0xful
);
91 * Set up the sigcontext for the signal frame.
94 static long setup_sigcontext(struct sigcontext __user
*sc
,
95 struct task_struct
*tsk
, int signr
, sigset_t
*set
,
96 unsigned long handler
, int ctx_has_vsx_region
)
98 /* When CONFIG_ALTIVEC is set, we _always_ setup v_regs even if the
99 * process never used altivec yet (MSR_VEC is zero in pt_regs of
100 * the context). This is very important because we must ensure we
101 * don't lose the VRSAVE content that may have been set prior to
102 * the process doing its first vector operation
103 * Userland shall check AT_HWCAP to know whether it can rely on the
104 * v_regs pointer or not
106 #ifdef CONFIG_ALTIVEC
107 elf_vrreg_t __user
*v_regs
= sigcontext_vmx_regs(sc
);
108 unsigned long vrsave
;
110 struct pt_regs
*regs
= tsk
->thread
.regs
;
111 unsigned long msr
= regs
->msr
;
114 BUG_ON(tsk
!= current
);
116 #ifdef CONFIG_ALTIVEC
117 err
|= __put_user(v_regs
, &sc
->v_regs
);
119 /* save altivec registers */
120 if (tsk
->thread
.used_vr
) {
121 flush_altivec_to_thread(tsk
);
122 /* Copy 33 vec registers (vr0..31 and vscr) to the stack */
123 err
|= __copy_to_user(v_regs
, &tsk
->thread
.vr_state
,
124 33 * sizeof(vector128
));
125 /* set MSR_VEC in the MSR value in the frame to indicate that sc->v_reg)
126 * contains valid data.
130 /* We always copy to/from vrsave, it's 0 if we don't have or don't
134 if (cpu_has_feature(CPU_FTR_ALTIVEC
)) {
135 vrsave
= mfspr(SPRN_VRSAVE
);
136 tsk
->thread
.vrsave
= vrsave
;
139 err
|= __put_user(vrsave
, (u32 __user
*)&v_regs
[33]);
140 #else /* CONFIG_ALTIVEC */
141 err
|= __put_user(0, &sc
->v_regs
);
142 #endif /* CONFIG_ALTIVEC */
143 flush_fp_to_thread(tsk
);
144 /* copy fpr regs and fpscr */
145 err
|= copy_fpr_to_user(&sc
->fp_regs
, tsk
);
148 * Clear the MSR VSX bit to indicate there is no valid state attached
149 * to this context, except in the specific case below where we set it.
154 * Copy VSX low doubleword to local buffer for formatting,
155 * then out to userspace. Update v_regs to point after the
158 if (tsk
->thread
.used_vsr
&& ctx_has_vsx_region
) {
159 flush_vsx_to_thread(tsk
);
160 v_regs
+= ELF_NVRREG
;
161 err
|= copy_vsx_to_user(v_regs
, tsk
);
162 /* set MSR_VSX in the MSR value in the frame to
163 * indicate that sc->vs_reg) contains valid data.
167 #endif /* CONFIG_VSX */
168 err
|= __put_user(&sc
->gp_regs
, &sc
->regs
);
169 WARN_ON(!FULL_REGS(regs
));
170 err
|= __copy_to_user(&sc
->gp_regs
, regs
, GP_REGS_SIZE
);
171 err
|= __put_user(msr
, &sc
->gp_regs
[PT_MSR
]);
172 err
|= __put_user(signr
, &sc
->signal
);
173 err
|= __put_user(handler
, &sc
->handler
);
175 err
|= __put_user(set
->sig
[0], &sc
->oldmask
);
180 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
182 * As above, but Transactional Memory is in use, so deliver sigcontexts
183 * containing checkpointed and transactional register states.
185 * To do this, we treclaim (done before entering here) to gather both sets of
186 * registers and set up the 'normal' sigcontext registers with rolled-back
187 * register values such that a simple signal handler sees a correct
188 * checkpointed register state. If interested, a TM-aware sighandler can
189 * examine the transactional registers in the 2nd sigcontext to determine the
190 * real origin of the signal.
192 static long setup_tm_sigcontexts(struct sigcontext __user
*sc
,
193 struct sigcontext __user
*tm_sc
,
194 struct task_struct
*tsk
,
195 int signr
, sigset_t
*set
, unsigned long handler
)
197 /* When CONFIG_ALTIVEC is set, we _always_ setup v_regs even if the
198 * process never used altivec yet (MSR_VEC is zero in pt_regs of
199 * the context). This is very important because we must ensure we
200 * don't lose the VRSAVE content that may have been set prior to
201 * the process doing its first vector operation
202 * Userland shall check AT_HWCAP to know wether it can rely on the
203 * v_regs pointer or not.
205 #ifdef CONFIG_ALTIVEC
206 elf_vrreg_t __user
*v_regs
= sigcontext_vmx_regs(sc
);
207 elf_vrreg_t __user
*tm_v_regs
= sigcontext_vmx_regs(tm_sc
);
209 struct pt_regs
*regs
= tsk
->thread
.regs
;
210 unsigned long msr
= tsk
->thread
.ckpt_regs
.msr
;
213 BUG_ON(tsk
!= current
);
215 BUG_ON(!MSR_TM_ACTIVE(regs
->msr
));
217 /* Remove TM bits from thread's MSR. The MSR in the sigcontext
218 * just indicates to userland that we were doing a transaction, but we
219 * don't want to return in transactional state. This also ensures
220 * that flush_fp_to_thread won't set TIF_RESTORE_TM again.
222 regs
->msr
&= ~MSR_TS_MASK
;
224 flush_fp_to_thread(tsk
);
226 #ifdef CONFIG_ALTIVEC
227 err
|= __put_user(v_regs
, &sc
->v_regs
);
228 err
|= __put_user(tm_v_regs
, &tm_sc
->v_regs
);
230 /* save altivec registers */
231 if (tsk
->thread
.used_vr
) {
232 flush_altivec_to_thread(tsk
);
233 /* Copy 33 vec registers (vr0..31 and vscr) to the stack */
234 err
|= __copy_to_user(v_regs
, &tsk
->thread
.vr_state
,
235 33 * sizeof(vector128
));
236 /* If VEC was enabled there are transactional VRs valid too,
237 * else they're a copy of the checkpointed VRs.
240 err
|= __copy_to_user(tm_v_regs
,
241 &tsk
->thread
.transact_vr
,
242 33 * sizeof(vector128
));
244 err
|= __copy_to_user(tm_v_regs
,
245 &tsk
->thread
.vr_state
,
246 33 * sizeof(vector128
));
248 /* set MSR_VEC in the MSR value in the frame to indicate
249 * that sc->v_reg contains valid data.
253 /* We always copy to/from vrsave, it's 0 if we don't have or don't
256 if (cpu_has_feature(CPU_FTR_ALTIVEC
))
257 tsk
->thread
.vrsave
= mfspr(SPRN_VRSAVE
);
258 err
|= __put_user(tsk
->thread
.vrsave
, (u32 __user
*)&v_regs
[33]);
260 err
|= __put_user(tsk
->thread
.transact_vrsave
,
261 (u32 __user
*)&tm_v_regs
[33]);
263 err
|= __put_user(tsk
->thread
.vrsave
,
264 (u32 __user
*)&tm_v_regs
[33]);
266 #else /* CONFIG_ALTIVEC */
267 err
|= __put_user(0, &sc
->v_regs
);
268 err
|= __put_user(0, &tm_sc
->v_regs
);
269 #endif /* CONFIG_ALTIVEC */
271 /* copy fpr regs and fpscr */
272 err
|= copy_fpr_to_user(&sc
->fp_regs
, tsk
);
274 err
|= copy_transact_fpr_to_user(&tm_sc
->fp_regs
, tsk
);
276 err
|= copy_fpr_to_user(&tm_sc
->fp_regs
, tsk
);
280 * Copy VSX low doubleword to local buffer for formatting,
281 * then out to userspace. Update v_regs to point after the
284 if (tsk
->thread
.used_vsr
) {
285 flush_vsx_to_thread(tsk
);
286 v_regs
+= ELF_NVRREG
;
287 tm_v_regs
+= ELF_NVRREG
;
289 err
|= copy_vsx_to_user(v_regs
, tsk
);
292 err
|= copy_transact_vsx_to_user(tm_v_regs
, tsk
);
294 err
|= copy_vsx_to_user(tm_v_regs
, tsk
);
296 /* set MSR_VSX in the MSR value in the frame to
297 * indicate that sc->vs_reg) contains valid data.
301 #endif /* CONFIG_VSX */
303 err
|= __put_user(&sc
->gp_regs
, &sc
->regs
);
304 err
|= __put_user(&tm_sc
->gp_regs
, &tm_sc
->regs
);
305 WARN_ON(!FULL_REGS(regs
));
306 err
|= __copy_to_user(&tm_sc
->gp_regs
, regs
, GP_REGS_SIZE
);
307 err
|= __copy_to_user(&sc
->gp_regs
,
308 &tsk
->thread
.ckpt_regs
, GP_REGS_SIZE
);
309 err
|= __put_user(msr
, &tm_sc
->gp_regs
[PT_MSR
]);
310 err
|= __put_user(msr
, &sc
->gp_regs
[PT_MSR
]);
311 err
|= __put_user(signr
, &sc
->signal
);
312 err
|= __put_user(handler
, &sc
->handler
);
314 err
|= __put_user(set
->sig
[0], &sc
->oldmask
);
321 * Restore the sigcontext from the signal frame.
324 static long restore_sigcontext(struct task_struct
*tsk
, sigset_t
*set
, int sig
,
325 struct sigcontext __user
*sc
)
327 #ifdef CONFIG_ALTIVEC
328 elf_vrreg_t __user
*v_regs
;
330 unsigned long err
= 0;
331 unsigned long save_r13
= 0;
333 struct pt_regs
*regs
= tsk
->thread
.regs
;
338 BUG_ON(tsk
!= current
);
340 /* If this is not a signal return, we preserve the TLS in r13 */
342 save_r13
= regs
->gpr
[13];
345 err
|= __copy_from_user(regs
->gpr
, sc
->gp_regs
, sizeof(regs
->gpr
));
346 err
|= __get_user(regs
->nip
, &sc
->gp_regs
[PT_NIP
]);
347 /* get MSR separately, transfer the LE bit if doing signal return */
348 err
|= __get_user(msr
, &sc
->gp_regs
[PT_MSR
]);
350 regs
->msr
= (regs
->msr
& ~MSR_LE
) | (msr
& MSR_LE
);
351 err
|= __get_user(regs
->orig_gpr3
, &sc
->gp_regs
[PT_ORIG_R3
]);
352 err
|= __get_user(regs
->ctr
, &sc
->gp_regs
[PT_CTR
]);
353 err
|= __get_user(regs
->link
, &sc
->gp_regs
[PT_LNK
]);
354 err
|= __get_user(regs
->xer
, &sc
->gp_regs
[PT_XER
]);
355 err
|= __get_user(regs
->ccr
, &sc
->gp_regs
[PT_CCR
]);
358 err
|= __get_user(regs
->dar
, &sc
->gp_regs
[PT_DAR
]);
359 err
|= __get_user(regs
->dsisr
, &sc
->gp_regs
[PT_DSISR
]);
360 err
|= __get_user(regs
->result
, &sc
->gp_regs
[PT_RESULT
]);
363 regs
->gpr
[13] = save_r13
;
365 err
|= __get_user(set
->sig
[0], &sc
->oldmask
);
368 * Force reload of FP/VEC.
369 * This has to be done before copying stuff into tsk->thread.fpr/vr
370 * for the reasons explained in the previous comment.
372 regs
->msr
&= ~(MSR_FP
| MSR_FE0
| MSR_FE1
| MSR_VEC
| MSR_VSX
);
374 #ifdef CONFIG_ALTIVEC
375 err
|= __get_user(v_regs
, &sc
->v_regs
);
378 if (v_regs
&& !access_ok(VERIFY_READ
, v_regs
, 34 * sizeof(vector128
)))
380 /* Copy 33 vec registers (vr0..31 and vscr) from the stack */
381 if (v_regs
!= NULL
&& (msr
& MSR_VEC
) != 0) {
382 err
|= __copy_from_user(&tsk
->thread
.vr_state
, v_regs
,
383 33 * sizeof(vector128
));
384 tsk
->thread
.used_vr
= true;
385 } else if (tsk
->thread
.used_vr
) {
386 memset(&tsk
->thread
.vr_state
, 0, 33 * sizeof(vector128
));
388 /* Always get VRSAVE back */
390 err
|= __get_user(tsk
->thread
.vrsave
, (u32 __user
*)&v_regs
[33]);
392 tsk
->thread
.vrsave
= 0;
393 if (cpu_has_feature(CPU_FTR_ALTIVEC
))
394 mtspr(SPRN_VRSAVE
, tsk
->thread
.vrsave
);
395 #endif /* CONFIG_ALTIVEC */
396 /* restore floating point */
397 err
|= copy_fpr_from_user(tsk
, &sc
->fp_regs
);
400 * Get additional VSX data. Update v_regs to point after the
401 * VMX data. Copy VSX low doubleword from userspace to local
402 * buffer for formatting, then into the taskstruct.
404 v_regs
+= ELF_NVRREG
;
405 if ((msr
& MSR_VSX
) != 0) {
406 err
|= copy_vsx_from_user(tsk
, v_regs
);
407 tsk
->thread
.used_vsr
= true;
409 for (i
= 0; i
< 32 ; i
++)
410 tsk
->thread
.fp_state
.fpr
[i
][TS_VSRLOWOFFSET
] = 0;
416 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
418 * Restore the two sigcontexts from the frame of a transactional processes.
421 static long restore_tm_sigcontexts(struct task_struct
*tsk
,
422 struct sigcontext __user
*sc
,
423 struct sigcontext __user
*tm_sc
)
425 #ifdef CONFIG_ALTIVEC
426 elf_vrreg_t __user
*v_regs
, *tm_v_regs
;
428 unsigned long err
= 0;
430 struct pt_regs
*regs
= tsk
->thread
.regs
;
435 BUG_ON(tsk
!= current
);
438 err
|= __copy_from_user(regs
->gpr
, tm_sc
->gp_regs
, sizeof(regs
->gpr
));
439 err
|= __copy_from_user(&tsk
->thread
.ckpt_regs
, sc
->gp_regs
,
443 * TFHAR is restored from the checkpointed 'wound-back' ucontext's NIP.
444 * TEXASR was set by the signal delivery reclaim, as was TFIAR.
445 * Users doing anything abhorrent like thread-switching w/ signals for
446 * TM-Suspended code will have to back TEXASR/TFIAR up themselves.
447 * For the case of getting a signal and simply returning from it,
448 * we don't need to re-copy them here.
450 err
|= __get_user(regs
->nip
, &tm_sc
->gp_regs
[PT_NIP
]);
451 err
|= __get_user(tsk
->thread
.tm_tfhar
, &sc
->gp_regs
[PT_NIP
]);
453 /* get MSR separately, transfer the LE bit if doing signal return */
454 err
|= __get_user(msr
, &sc
->gp_regs
[PT_MSR
]);
455 /* Don't allow reserved mode. */
456 if (MSR_TM_RESV(msr
))
459 /* pull in MSR TM from user context */
460 regs
->msr
= (regs
->msr
& ~MSR_TS_MASK
) | (msr
& MSR_TS_MASK
);
462 /* pull in MSR LE from user context */
463 regs
->msr
= (regs
->msr
& ~MSR_LE
) | (msr
& MSR_LE
);
465 /* The following non-GPR non-FPR non-VR state is also checkpointed: */
466 err
|= __get_user(regs
->ctr
, &tm_sc
->gp_regs
[PT_CTR
]);
467 err
|= __get_user(regs
->link
, &tm_sc
->gp_regs
[PT_LNK
]);
468 err
|= __get_user(regs
->xer
, &tm_sc
->gp_regs
[PT_XER
]);
469 err
|= __get_user(regs
->ccr
, &tm_sc
->gp_regs
[PT_CCR
]);
470 err
|= __get_user(tsk
->thread
.ckpt_regs
.ctr
,
471 &sc
->gp_regs
[PT_CTR
]);
472 err
|= __get_user(tsk
->thread
.ckpt_regs
.link
,
473 &sc
->gp_regs
[PT_LNK
]);
474 err
|= __get_user(tsk
->thread
.ckpt_regs
.xer
,
475 &sc
->gp_regs
[PT_XER
]);
476 err
|= __get_user(tsk
->thread
.ckpt_regs
.ccr
,
477 &sc
->gp_regs
[PT_CCR
]);
479 /* These regs are not checkpointed; they can go in 'regs'. */
480 err
|= __get_user(regs
->trap
, &sc
->gp_regs
[PT_TRAP
]);
481 err
|= __get_user(regs
->dar
, &sc
->gp_regs
[PT_DAR
]);
482 err
|= __get_user(regs
->dsisr
, &sc
->gp_regs
[PT_DSISR
]);
483 err
|= __get_user(regs
->result
, &sc
->gp_regs
[PT_RESULT
]);
486 * Force reload of FP/VEC.
487 * This has to be done before copying stuff into tsk->thread.fpr/vr
488 * for the reasons explained in the previous comment.
490 regs
->msr
&= ~(MSR_FP
| MSR_FE0
| MSR_FE1
| MSR_VEC
| MSR_VSX
);
492 #ifdef CONFIG_ALTIVEC
493 err
|= __get_user(v_regs
, &sc
->v_regs
);
494 err
|= __get_user(tm_v_regs
, &tm_sc
->v_regs
);
497 if (v_regs
&& !access_ok(VERIFY_READ
, v_regs
, 34 * sizeof(vector128
)))
499 if (tm_v_regs
&& !access_ok(VERIFY_READ
,
500 tm_v_regs
, 34 * sizeof(vector128
)))
502 /* Copy 33 vec registers (vr0..31 and vscr) from the stack */
503 if (v_regs
!= NULL
&& tm_v_regs
!= NULL
&& (msr
& MSR_VEC
) != 0) {
504 err
|= __copy_from_user(&tsk
->thread
.vr_state
, v_regs
,
505 33 * sizeof(vector128
));
506 err
|= __copy_from_user(&tsk
->thread
.transact_vr
, tm_v_regs
,
507 33 * sizeof(vector128
));
508 current
->thread
.used_vr
= true;
510 else if (tsk
->thread
.used_vr
) {
511 memset(&tsk
->thread
.vr_state
, 0, 33 * sizeof(vector128
));
512 memset(&tsk
->thread
.transact_vr
, 0, 33 * sizeof(vector128
));
514 /* Always get VRSAVE back */
515 if (v_regs
!= NULL
&& tm_v_regs
!= NULL
) {
516 err
|= __get_user(tsk
->thread
.vrsave
,
517 (u32 __user
*)&v_regs
[33]);
518 err
|= __get_user(tsk
->thread
.transact_vrsave
,
519 (u32 __user
*)&tm_v_regs
[33]);
522 tsk
->thread
.vrsave
= 0;
523 tsk
->thread
.transact_vrsave
= 0;
525 if (cpu_has_feature(CPU_FTR_ALTIVEC
))
526 mtspr(SPRN_VRSAVE
, tsk
->thread
.vrsave
);
527 #endif /* CONFIG_ALTIVEC */
528 /* restore floating point */
529 err
|= copy_fpr_from_user(tsk
, &sc
->fp_regs
);
530 err
|= copy_transact_fpr_from_user(tsk
, &tm_sc
->fp_regs
);
533 * Get additional VSX data. Update v_regs to point after the
534 * VMX data. Copy VSX low doubleword from userspace to local
535 * buffer for formatting, then into the taskstruct.
537 if (v_regs
&& ((msr
& MSR_VSX
) != 0)) {
538 v_regs
+= ELF_NVRREG
;
539 tm_v_regs
+= ELF_NVRREG
;
540 err
|= copy_vsx_from_user(tsk
, v_regs
);
541 err
|= copy_transact_vsx_from_user(tsk
, tm_v_regs
);
542 tsk
->thread
.used_vsr
= true;
544 for (i
= 0; i
< 32 ; i
++) {
545 tsk
->thread
.fp_state
.fpr
[i
][TS_VSRLOWOFFSET
] = 0;
546 tsk
->thread
.transact_fp
.fpr
[i
][TS_VSRLOWOFFSET
] = 0;
551 /* Make sure the transaction is marked as failed */
552 tsk
->thread
.tm_texasr
|= TEXASR_FS
;
553 /* This loads the checkpointed FP/VEC state, if used */
554 tm_recheckpoint(&tsk
->thread
, msr
);
556 /* This loads the speculative FP/VEC state, if used */
558 do_load_up_transact_fpu(&tsk
->thread
);
559 regs
->msr
|= (MSR_FP
| tsk
->thread
.fpexc_mode
);
561 #ifdef CONFIG_ALTIVEC
563 do_load_up_transact_altivec(&tsk
->thread
);
564 regs
->msr
|= MSR_VEC
;
573 * Setup the trampoline code on the stack
575 static long setup_trampoline(unsigned int syscall
, unsigned int __user
*tramp
)
580 /* addi r1, r1, __SIGNAL_FRAMESIZE # Pop the dummy stackframe */
581 err
|= __put_user(0x38210000UL
| (__SIGNAL_FRAMESIZE
& 0xffff), &tramp
[0]);
582 /* li r0, __NR_[rt_]sigreturn| */
583 err
|= __put_user(0x38000000UL
| (syscall
& 0xffff), &tramp
[1]);
585 err
|= __put_user(0x44000002UL
, &tramp
[2]);
587 /* Minimal traceback info */
588 for (i
=TRAMP_TRACEBACK
; i
< TRAMP_SIZE
;i
++)
589 err
|= __put_user(0, &tramp
[i
]);
592 flush_icache_range((unsigned long) &tramp
[0],
593 (unsigned long) &tramp
[TRAMP_SIZE
]);
599 * Userspace code may pass a ucontext which doesn't include VSX added
600 * at the end. We need to check for this case.
602 #define UCONTEXTSIZEWITHOUTVSX \
603 (sizeof(struct ucontext) - 32*sizeof(long))
606 * Handle {get,set,swap}_context operations
608 int sys_swapcontext(struct ucontext __user
*old_ctx
,
609 struct ucontext __user
*new_ctx
,
610 long ctx_size
, long r6
, long r7
, long r8
, struct pt_regs
*regs
)
614 unsigned long new_msr
= 0;
615 int ctx_has_vsx_region
= 0;
617 BUG_ON(regs
!= current
->thread
.regs
);
620 get_user(new_msr
, &new_ctx
->uc_mcontext
.gp_regs
[PT_MSR
]))
623 * Check that the context is not smaller than the original
624 * size (with VMX but without VSX)
626 if (ctx_size
< UCONTEXTSIZEWITHOUTVSX
)
629 * If the new context state sets the MSR VSX bits but
630 * it doesn't provide VSX state.
632 if ((ctx_size
< sizeof(struct ucontext
)) &&
635 /* Does the context have enough room to store VSX data? */
636 if (ctx_size
>= sizeof(struct ucontext
))
637 ctx_has_vsx_region
= 1;
639 if (old_ctx
!= NULL
) {
640 if (!access_ok(VERIFY_WRITE
, old_ctx
, ctx_size
)
641 || setup_sigcontext(&old_ctx
->uc_mcontext
, current
, 0, NULL
, 0,
643 || __copy_to_user(&old_ctx
->uc_sigmask
,
644 ¤t
->blocked
, sizeof(sigset_t
)))
649 if (!access_ok(VERIFY_READ
, new_ctx
, ctx_size
)
650 || __get_user(tmp
, (u8 __user
*) new_ctx
)
651 || __get_user(tmp
, (u8 __user
*) new_ctx
+ ctx_size
- 1))
655 * If we get a fault copying the context into the kernel's
656 * image of the user's registers, we can't just return -EFAULT
657 * because the user's registers will be corrupted. For instance
658 * the NIP value may have been updated but not some of the
659 * other registers. Given that we have done the access_ok
660 * and successfully read the first and last bytes of the region
661 * above, this should only happen in an out-of-memory situation
662 * or if another thread unmaps the region containing the context.
663 * We kill the task with a SIGSEGV in this situation.
666 if (__copy_from_user(&set
, &new_ctx
->uc_sigmask
, sizeof(set
)))
668 set_current_blocked(&set
);
669 if (restore_sigcontext(current
, NULL
, 0, &new_ctx
->uc_mcontext
))
672 /* This returns like rt_sigreturn */
673 set_thread_flag(TIF_RESTOREALL
);
679 * Do a signal return; undo the signal stack.
682 int sys_rt_sigreturn(unsigned long r3
, unsigned long r4
, unsigned long r5
,
683 unsigned long r6
, unsigned long r7
, unsigned long r8
,
684 struct pt_regs
*regs
)
686 struct ucontext __user
*uc
= (struct ucontext __user
*)regs
->gpr
[1];
688 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
692 BUG_ON(current
->thread
.regs
!= regs
);
694 /* Always make any pending restarted system calls return -EINTR */
695 current
->restart_block
.fn
= do_no_restart_syscall
;
697 if (!access_ok(VERIFY_READ
, uc
, sizeof(*uc
)))
700 if (__copy_from_user(&set
, &uc
->uc_sigmask
, sizeof(set
)))
702 set_current_blocked(&set
);
704 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
706 * If there is a transactional state then throw it away.
707 * The purpose of a sigreturn is to destroy all traces of the
708 * signal frame, this includes any transactional state created
709 * within in. We only check for suspended as we can never be
710 * active in the kernel, we are active, there is nothing better to
711 * do than go ahead and Bad Thing later.
712 * The cause is not important as there will never be a
713 * recheckpoint so it's not user visible.
715 if (MSR_TM_SUSPENDED(mfmsr()))
716 tm_reclaim_current(0);
718 if (__get_user(msr
, &uc
->uc_mcontext
.gp_regs
[PT_MSR
]))
720 if (MSR_TM_ACTIVE(msr
)) {
721 /* We recheckpoint on return. */
722 struct ucontext __user
*uc_transact
;
723 if (__get_user(uc_transact
, &uc
->uc_link
))
725 if (restore_tm_sigcontexts(current
, &uc
->uc_mcontext
,
726 &uc_transact
->uc_mcontext
))
730 /* Fall through, for non-TM restore */
732 if (restore_sigcontext(current
, NULL
, 1, &uc
->uc_mcontext
))
735 if (restore_altstack(&uc
->uc_stack
))
738 set_thread_flag(TIF_RESTOREALL
);
742 if (show_unhandled_signals
)
743 printk_ratelimited(regs
->msr
& MSR_64BIT
? fmt64
: fmt32
,
744 current
->comm
, current
->pid
, "rt_sigreturn",
745 (long)uc
, regs
->nip
, regs
->link
);
747 force_sig(SIGSEGV
, current
);
751 int handle_rt_signal64(struct ksignal
*ksig
, sigset_t
*set
,
752 struct task_struct
*tsk
)
754 struct rt_sigframe __user
*frame
;
755 unsigned long newsp
= 0;
757 struct pt_regs
*regs
= tsk
->thread
.regs
;
759 BUG_ON(tsk
!= current
);
761 frame
= get_sigframe(ksig
, get_tm_stackpointer(tsk
), sizeof(*frame
), 0);
762 if (unlikely(frame
== NULL
))
765 err
|= __put_user(&frame
->info
, &frame
->pinfo
);
766 err
|= __put_user(&frame
->uc
, &frame
->puc
);
767 err
|= copy_siginfo_to_user(&frame
->info
, &ksig
->info
);
771 /* Create the ucontext. */
772 err
|= __put_user(0, &frame
->uc
.uc_flags
);
773 err
|= __save_altstack(&frame
->uc
.uc_stack
, regs
->gpr
[1]);
774 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
775 if (MSR_TM_ACTIVE(regs
->msr
)) {
776 /* The ucontext_t passed to userland points to the second
777 * ucontext_t (for transactional state) with its uc_link ptr.
779 err
|= __put_user(&frame
->uc_transact
, &frame
->uc
.uc_link
);
780 err
|= setup_tm_sigcontexts(&frame
->uc
.uc_mcontext
,
781 &frame
->uc_transact
.uc_mcontext
,
782 tsk
, ksig
->sig
, NULL
,
783 (unsigned long)ksig
->ka
.sa
.sa_handler
);
787 err
|= __put_user(0, &frame
->uc
.uc_link
);
788 err
|= setup_sigcontext(&frame
->uc
.uc_mcontext
, tsk
, ksig
->sig
,
789 NULL
, (unsigned long)ksig
->ka
.sa
.sa_handler
,
792 err
|= __copy_to_user(&frame
->uc
.uc_sigmask
, set
, sizeof(*set
));
796 /* Make sure signal handler doesn't get spurious FP exceptions */
797 tsk
->thread
.fp_state
.fpscr
= 0;
799 /* Set up to return from userspace. */
800 if (vdso64_rt_sigtramp
&& tsk
->mm
->context
.vdso_base
) {
801 regs
->link
= tsk
->mm
->context
.vdso_base
+ vdso64_rt_sigtramp
;
803 err
|= setup_trampoline(__NR_rt_sigreturn
, &frame
->tramp
[0]);
806 regs
->link
= (unsigned long) &frame
->tramp
[0];
809 /* Allocate a dummy caller frame for the signal handler. */
810 newsp
= ((unsigned long)frame
) - __SIGNAL_FRAMESIZE
;
811 err
|= put_user(regs
->gpr
[1], (unsigned long __user
*)newsp
);
813 /* Set up "regs" so we "return" to the signal handler. */
814 if (is_elf2_task()) {
815 regs
->nip
= (unsigned long) ksig
->ka
.sa
.sa_handler
;
816 regs
->gpr
[12] = regs
->nip
;
818 /* Handler is *really* a pointer to the function descriptor for
819 * the signal routine. The first entry in the function
820 * descriptor is the entry address of signal and the second
821 * entry is the TOC value we need to use.
823 func_descr_t __user
*funct_desc_ptr
=
824 (func_descr_t __user
*) ksig
->ka
.sa
.sa_handler
;
826 err
|= get_user(regs
->nip
, &funct_desc_ptr
->entry
);
827 err
|= get_user(regs
->gpr
[2], &funct_desc_ptr
->toc
);
830 /* enter the signal handler in native-endian mode */
831 regs
->msr
&= ~MSR_LE
;
832 regs
->msr
|= (MSR_KERNEL
& MSR_LE
);
833 regs
->gpr
[1] = newsp
;
834 regs
->gpr
[3] = ksig
->sig
;
836 if (ksig
->ka
.sa
.sa_flags
& SA_SIGINFO
) {
837 err
|= get_user(regs
->gpr
[4], (unsigned long __user
*)&frame
->pinfo
);
838 err
|= get_user(regs
->gpr
[5], (unsigned long __user
*)&frame
->puc
);
839 regs
->gpr
[6] = (unsigned long) frame
;
841 regs
->gpr
[4] = (unsigned long)&frame
->uc
.uc_mcontext
;
849 if (show_unhandled_signals
)
850 printk_ratelimited(regs
->msr
& MSR_64BIT
? fmt64
: fmt32
,
851 tsk
->comm
, tsk
->pid
, "setup_rt_frame",
852 (long)frame
, regs
->nip
, regs
->link
);