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11#include <linux/sched.h>
12#include <linux/mm.h>
13#include <linux/smp.h>
14#include <linux/kernel.h>
15#include <linux/signal.h>
16#include <linux/errno.h>
17#include <linux/wait.h>
18#include <linux/unistd.h>
19#include <linux/stddef.h>
20#include <linux/elf.h>
21#include <linux/ptrace.h>
22#include <linux/ratelimit.h>
23#include <linux/syscalls.h>
24#include <linux/pagemap.h>
25
26#include <asm/sigcontext.h>
27#include <asm/ucontext.h>
28#include <linux/uaccess.h>
29#include <asm/unistd.h>
30#include <asm/cacheflush.h>
31#include <asm/syscalls.h>
32#include <asm/vdso.h>
33#include <asm/switch_to.h>
34#include <asm/tm.h>
35#include <asm/asm-prototypes.h>
36
37#include "signal.h"
38
39
40#define GP_REGS_SIZE min(sizeof(elf_gregset_t), sizeof(struct pt_regs))
41#define FP_REGS_SIZE sizeof(elf_fpregset_t)
42
43#define TRAMP_TRACEBACK 4
44#define TRAMP_SIZE 7
45
46
47
48
49
50
51
52
53
54struct rt_sigframe {
55
56 struct ucontext uc;
57#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
58 struct ucontext uc_transact;
59#endif
60 unsigned long _unused[2];
61 unsigned int tramp[TRAMP_SIZE];
62 struct siginfo __user *pinfo;
63 void __user *puc;
64 struct siginfo info;
65
66 char abigap[USER_REDZONE_SIZE];
67} __attribute__ ((aligned (16)));
68
69
70
71
72
73
74
75#ifdef CONFIG_ALTIVEC
76static elf_vrreg_t __user *sigcontext_vmx_regs(struct sigcontext __user *sc)
77{
78 return (elf_vrreg_t __user *) (((unsigned long)sc->vmx_reserve + 15) & ~0xful);
79}
80#endif
81
82static void prepare_setup_sigcontext(struct task_struct *tsk)
83{
84#ifdef CONFIG_ALTIVEC
85
86 if (tsk->thread.used_vr)
87 flush_altivec_to_thread(tsk);
88 if (cpu_has_feature(CPU_FTR_ALTIVEC))
89 tsk->thread.vrsave = mfspr(SPRN_VRSAVE);
90#endif
91
92 flush_fp_to_thread(tsk);
93
94#ifdef CONFIG_VSX
95 if (tsk->thread.used_vsr)
96 flush_vsx_to_thread(tsk);
97#endif
98}
99
100
101
102
103
104#define unsafe_setup_sigcontext(sc, tsk, signr, set, handler, ctx_has_vsx_region, label)\
105do { \
106 if (__unsafe_setup_sigcontext(sc, tsk, signr, set, handler, ctx_has_vsx_region))\
107 goto label; \
108} while (0)
109static long notrace __unsafe_setup_sigcontext(struct sigcontext __user *sc,
110 struct task_struct *tsk, int signr, sigset_t *set,
111 unsigned long handler, int ctx_has_vsx_region)
112{
113
114
115
116
117
118
119
120
121#ifdef CONFIG_ALTIVEC
122 elf_vrreg_t __user *v_regs = sigcontext_vmx_regs(sc);
123#endif
124 struct pt_regs *regs = tsk->thread.regs;
125 unsigned long msr = regs->msr;
126
127 unsigned long softe = 0x1;
128
129 BUG_ON(tsk != current);
130
131#ifdef CONFIG_ALTIVEC
132 unsafe_put_user(v_regs, &sc->v_regs, efault_out);
133
134
135 if (tsk->thread.used_vr) {
136
137 unsafe_copy_to_user(v_regs, &tsk->thread.vr_state,
138 33 * sizeof(vector128), efault_out);
139
140
141
142 msr |= MSR_VEC;
143 }
144
145
146
147 unsafe_put_user(tsk->thread.vrsave, (u32 __user *)&v_regs[33], efault_out);
148#else
149 unsafe_put_user(0, &sc->v_regs, efault_out);
150#endif
151
152 unsafe_copy_fpr_to_user(&sc->fp_regs, tsk, efault_out);
153
154
155
156
157
158 msr &= ~MSR_VSX;
159#ifdef CONFIG_VSX
160
161
162
163
164
165 if (tsk->thread.used_vsr && ctx_has_vsx_region) {
166 v_regs += ELF_NVRREG;
167 unsafe_copy_vsx_to_user(v_regs, tsk, efault_out);
168
169
170
171 msr |= MSR_VSX;
172 }
173#endif
174 unsafe_put_user(&sc->gp_regs, &sc->regs, efault_out);
175 unsafe_copy_to_user(&sc->gp_regs, regs, GP_REGS_SIZE, efault_out);
176 unsafe_put_user(msr, &sc->gp_regs[PT_MSR], efault_out);
177 unsafe_put_user(softe, &sc->gp_regs[PT_SOFTE], efault_out);
178 unsafe_put_user(signr, &sc->signal, efault_out);
179 unsafe_put_user(handler, &sc->handler, efault_out);
180 if (set != NULL)
181 unsafe_put_user(set->sig[0], &sc->oldmask, efault_out);
182
183 return 0;
184
185efault_out:
186 return -EFAULT;
187}
188
189#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
190
191
192
193
194
195
196
197
198
199
200
201static long setup_tm_sigcontexts(struct sigcontext __user *sc,
202 struct sigcontext __user *tm_sc,
203 struct task_struct *tsk,
204 int signr, sigset_t *set, unsigned long handler,
205 unsigned long msr)
206{
207
208
209
210
211
212
213
214
215#ifdef CONFIG_ALTIVEC
216 elf_vrreg_t __user *v_regs = sigcontext_vmx_regs(sc);
217 elf_vrreg_t __user *tm_v_regs = sigcontext_vmx_regs(tm_sc);
218#endif
219 struct pt_regs *regs = tsk->thread.regs;
220 long err = 0;
221
222 BUG_ON(tsk != current);
223
224 BUG_ON(!MSR_TM_ACTIVE(msr));
225
226 WARN_ON(tm_suspend_disabled);
227
228
229
230
231
232 msr |= tsk->thread.ckpt_regs.msr & (MSR_FP | MSR_VEC | MSR_VSX);
233
234#ifdef CONFIG_ALTIVEC
235 err |= __put_user(v_regs, &sc->v_regs);
236 err |= __put_user(tm_v_regs, &tm_sc->v_regs);
237
238
239 if (tsk->thread.used_vr) {
240
241 err |= __copy_to_user(v_regs, &tsk->thread.ckvr_state,
242 33 * sizeof(vector128));
243
244
245
246 if (msr & MSR_VEC)
247 err |= __copy_to_user(tm_v_regs,
248 &tsk->thread.vr_state,
249 33 * sizeof(vector128));
250 else
251 err |= __copy_to_user(tm_v_regs,
252 &tsk->thread.ckvr_state,
253 33 * sizeof(vector128));
254
255
256
257
258 msr |= MSR_VEC;
259 }
260
261
262
263 if (cpu_has_feature(CPU_FTR_ALTIVEC))
264 tsk->thread.ckvrsave = mfspr(SPRN_VRSAVE);
265 err |= __put_user(tsk->thread.ckvrsave, (u32 __user *)&v_regs[33]);
266 if (msr & MSR_VEC)
267 err |= __put_user(tsk->thread.vrsave,
268 (u32 __user *)&tm_v_regs[33]);
269 else
270 err |= __put_user(tsk->thread.ckvrsave,
271 (u32 __user *)&tm_v_regs[33]);
272
273#else
274 err |= __put_user(0, &sc->v_regs);
275 err |= __put_user(0, &tm_sc->v_regs);
276#endif
277
278
279 err |= copy_ckfpr_to_user(&sc->fp_regs, tsk);
280 if (msr & MSR_FP)
281 err |= copy_fpr_to_user(&tm_sc->fp_regs, tsk);
282 else
283 err |= copy_ckfpr_to_user(&tm_sc->fp_regs, tsk);
284
285#ifdef CONFIG_VSX
286
287
288
289
290
291 if (tsk->thread.used_vsr) {
292 v_regs += ELF_NVRREG;
293 tm_v_regs += ELF_NVRREG;
294
295 err |= copy_ckvsx_to_user(v_regs, tsk);
296
297 if (msr & MSR_VSX)
298 err |= copy_vsx_to_user(tm_v_regs, tsk);
299 else
300 err |= copy_ckvsx_to_user(tm_v_regs, tsk);
301
302
303
304
305 msr |= MSR_VSX;
306 }
307#endif
308
309 err |= __put_user(&sc->gp_regs, &sc->regs);
310 err |= __put_user(&tm_sc->gp_regs, &tm_sc->regs);
311 err |= __copy_to_user(&tm_sc->gp_regs, regs, GP_REGS_SIZE);
312 err |= __copy_to_user(&sc->gp_regs,
313 &tsk->thread.ckpt_regs, GP_REGS_SIZE);
314 err |= __put_user(msr, &tm_sc->gp_regs[PT_MSR]);
315 err |= __put_user(msr, &sc->gp_regs[PT_MSR]);
316 err |= __put_user(signr, &sc->signal);
317 err |= __put_user(handler, &sc->handler);
318 if (set != NULL)
319 err |= __put_user(set->sig[0], &sc->oldmask);
320
321 return err;
322}
323#endif
324
325
326
327
328#define unsafe_restore_sigcontext(tsk, set, sig, sc, label) do { \
329 if (__unsafe_restore_sigcontext(tsk, set, sig, sc)) \
330 goto label; \
331} while (0)
332static long notrace __unsafe_restore_sigcontext(struct task_struct *tsk, sigset_t *set,
333 int sig, struct sigcontext __user *sc)
334{
335#ifdef CONFIG_ALTIVEC
336 elf_vrreg_t __user *v_regs;
337#endif
338 unsigned long save_r13 = 0;
339 unsigned long msr;
340 struct pt_regs *regs = tsk->thread.regs;
341#ifdef CONFIG_VSX
342 int i;
343#endif
344
345 BUG_ON(tsk != current);
346
347
348 if (!sig)
349 save_r13 = regs->gpr[13];
350
351
352 unsafe_copy_from_user(regs->gpr, sc->gp_regs, sizeof(regs->gpr), efault_out);
353 unsafe_get_user(regs->nip, &sc->gp_regs[PT_NIP], efault_out);
354
355 unsafe_get_user(msr, &sc->gp_regs[PT_MSR], efault_out);
356 if (sig)
357 regs_set_return_msr(regs, (regs->msr & ~MSR_LE) | (msr & MSR_LE));
358 unsafe_get_user(regs->orig_gpr3, &sc->gp_regs[PT_ORIG_R3], efault_out);
359 unsafe_get_user(regs->ctr, &sc->gp_regs[PT_CTR], efault_out);
360 unsafe_get_user(regs->link, &sc->gp_regs[PT_LNK], efault_out);
361 unsafe_get_user(regs->xer, &sc->gp_regs[PT_XER], efault_out);
362 unsafe_get_user(regs->ccr, &sc->gp_regs[PT_CCR], efault_out);
363
364 set_trap_norestart(regs);
365 unsafe_get_user(regs->dar, &sc->gp_regs[PT_DAR], efault_out);
366 unsafe_get_user(regs->dsisr, &sc->gp_regs[PT_DSISR], efault_out);
367 unsafe_get_user(regs->result, &sc->gp_regs[PT_RESULT], efault_out);
368
369 if (!sig)
370 regs->gpr[13] = save_r13;
371 if (set != NULL)
372 unsafe_get_user(set->sig[0], &sc->oldmask, efault_out);
373
374
375
376
377
378
379 regs_set_return_msr(regs, regs->msr & ~(MSR_FP | MSR_FE0 | MSR_FE1 | MSR_VEC | MSR_VSX));
380
381#ifdef CONFIG_ALTIVEC
382 unsafe_get_user(v_regs, &sc->v_regs, efault_out);
383 if (v_regs && !access_ok(v_regs, 34 * sizeof(vector128)))
384 return -EFAULT;
385
386 if (v_regs != NULL && (msr & MSR_VEC) != 0) {
387 unsafe_copy_from_user(&tsk->thread.vr_state, v_regs,
388 33 * sizeof(vector128), efault_out);
389 tsk->thread.used_vr = true;
390 } else if (tsk->thread.used_vr) {
391 memset(&tsk->thread.vr_state, 0, 33 * sizeof(vector128));
392 }
393
394 if (v_regs != NULL)
395 unsafe_get_user(tsk->thread.vrsave, (u32 __user *)&v_regs[33], efault_out);
396 else
397 tsk->thread.vrsave = 0;
398 if (cpu_has_feature(CPU_FTR_ALTIVEC))
399 mtspr(SPRN_VRSAVE, tsk->thread.vrsave);
400#endif
401
402 unsafe_copy_fpr_from_user(tsk, &sc->fp_regs, efault_out);
403#ifdef CONFIG_VSX
404
405
406
407
408
409 v_regs += ELF_NVRREG;
410 if ((msr & MSR_VSX) != 0) {
411 unsafe_copy_vsx_from_user(tsk, v_regs, efault_out);
412 tsk->thread.used_vsr = true;
413 } else {
414 for (i = 0; i < 32 ; i++)
415 tsk->thread.fp_state.fpr[i][TS_VSRLOWOFFSET] = 0;
416 }
417#endif
418 return 0;
419
420efault_out:
421 return -EFAULT;
422}
423
424#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
425
426
427
428
429static long restore_tm_sigcontexts(struct task_struct *tsk,
430 struct sigcontext __user *sc,
431 struct sigcontext __user *tm_sc)
432{
433#ifdef CONFIG_ALTIVEC
434 elf_vrreg_t __user *v_regs, *tm_v_regs;
435#endif
436 unsigned long err = 0;
437 unsigned long msr;
438 struct pt_regs *regs = tsk->thread.regs;
439#ifdef CONFIG_VSX
440 int i;
441#endif
442
443 BUG_ON(tsk != current);
444
445 if (tm_suspend_disabled)
446 return -EINVAL;
447
448
449 err |= __copy_from_user(regs->gpr, tm_sc->gp_regs, sizeof(regs->gpr));
450 err |= __copy_from_user(&tsk->thread.ckpt_regs, sc->gp_regs,
451 sizeof(regs->gpr));
452
453
454
455
456
457
458
459
460
461 err |= __get_user(regs->nip, &tm_sc->gp_regs[PT_NIP]);
462 err |= __get_user(tsk->thread.tm_tfhar, &sc->gp_regs[PT_NIP]);
463
464
465 err |= __get_user(msr, &sc->gp_regs[PT_MSR]);
466
467 if (MSR_TM_RESV(msr))
468 return -EINVAL;
469
470
471 regs_set_return_msr(regs, (regs->msr & ~MSR_LE) | (msr & MSR_LE));
472
473
474 err |= __get_user(regs->ctr, &tm_sc->gp_regs[PT_CTR]);
475 err |= __get_user(regs->link, &tm_sc->gp_regs[PT_LNK]);
476 err |= __get_user(regs->xer, &tm_sc->gp_regs[PT_XER]);
477 err |= __get_user(regs->ccr, &tm_sc->gp_regs[PT_CCR]);
478 err |= __get_user(tsk->thread.ckpt_regs.ctr,
479 &sc->gp_regs[PT_CTR]);
480 err |= __get_user(tsk->thread.ckpt_regs.link,
481 &sc->gp_regs[PT_LNK]);
482 err |= __get_user(tsk->thread.ckpt_regs.xer,
483 &sc->gp_regs[PT_XER]);
484 err |= __get_user(tsk->thread.ckpt_regs.ccr,
485 &sc->gp_regs[PT_CCR]);
486
487 set_trap_norestart(regs);
488
489 err |= __get_user(regs->dar, &sc->gp_regs[PT_DAR]);
490 err |= __get_user(regs->dsisr, &sc->gp_regs[PT_DSISR]);
491 err |= __get_user(regs->result, &sc->gp_regs[PT_RESULT]);
492
493
494
495
496
497
498 regs_set_return_msr(regs, regs->msr & ~(MSR_FP | MSR_FE0 | MSR_FE1 | MSR_VEC | MSR_VSX));
499
500#ifdef CONFIG_ALTIVEC
501 err |= __get_user(v_regs, &sc->v_regs);
502 err |= __get_user(tm_v_regs, &tm_sc->v_regs);
503 if (err)
504 return err;
505 if (v_regs && !access_ok(v_regs, 34 * sizeof(vector128)))
506 return -EFAULT;
507 if (tm_v_regs && !access_ok(tm_v_regs, 34 * sizeof(vector128)))
508 return -EFAULT;
509
510 if (v_regs != NULL && tm_v_regs != NULL && (msr & MSR_VEC) != 0) {
511 err |= __copy_from_user(&tsk->thread.ckvr_state, v_regs,
512 33 * sizeof(vector128));
513 err |= __copy_from_user(&tsk->thread.vr_state, tm_v_regs,
514 33 * sizeof(vector128));
515 current->thread.used_vr = true;
516 }
517 else if (tsk->thread.used_vr) {
518 memset(&tsk->thread.vr_state, 0, 33 * sizeof(vector128));
519 memset(&tsk->thread.ckvr_state, 0, 33 * sizeof(vector128));
520 }
521
522 if (v_regs != NULL && tm_v_regs != NULL) {
523 err |= __get_user(tsk->thread.ckvrsave,
524 (u32 __user *)&v_regs[33]);
525 err |= __get_user(tsk->thread.vrsave,
526 (u32 __user *)&tm_v_regs[33]);
527 }
528 else {
529 tsk->thread.vrsave = 0;
530 tsk->thread.ckvrsave = 0;
531 }
532 if (cpu_has_feature(CPU_FTR_ALTIVEC))
533 mtspr(SPRN_VRSAVE, tsk->thread.vrsave);
534#endif
535
536 err |= copy_fpr_from_user(tsk, &tm_sc->fp_regs);
537 err |= copy_ckfpr_from_user(tsk, &sc->fp_regs);
538#ifdef CONFIG_VSX
539
540
541
542
543
544 if (v_regs && ((msr & MSR_VSX) != 0)) {
545 v_regs += ELF_NVRREG;
546 tm_v_regs += ELF_NVRREG;
547 err |= copy_vsx_from_user(tsk, tm_v_regs);
548 err |= copy_ckvsx_from_user(tsk, v_regs);
549 tsk->thread.used_vsr = true;
550 } else {
551 for (i = 0; i < 32 ; i++) {
552 tsk->thread.fp_state.fpr[i][TS_VSRLOWOFFSET] = 0;
553 tsk->thread.ckfp_state.fpr[i][TS_VSRLOWOFFSET] = 0;
554 }
555 }
556#endif
557 tm_enable();
558
559 tsk->thread.tm_texasr |= TEXASR_FS;
560
561
562
563
564
565 preempt_disable();
566
567
568 regs_set_return_msr(regs, regs->msr | (msr & MSR_TS_MASK));
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586 regs_set_return_msr(regs, regs->msr | MSR_TM);
587
588
589 tm_recheckpoint(&tsk->thread);
590
591 msr_check_and_set(msr & (MSR_FP | MSR_VEC));
592 if (msr & MSR_FP) {
593 load_fp_state(&tsk->thread.fp_state);
594 regs_set_return_msr(regs, regs->msr | (MSR_FP | tsk->thread.fpexc_mode));
595 }
596 if (msr & MSR_VEC) {
597 load_vr_state(&tsk->thread.vr_state);
598 regs_set_return_msr(regs, regs->msr | MSR_VEC);
599 }
600
601 preempt_enable();
602
603 return err;
604}
605#else
606static long restore_tm_sigcontexts(struct task_struct *tsk, struct sigcontext __user *sc,
607 struct sigcontext __user *tm_sc)
608{
609 return -EINVAL;
610}
611#endif
612
613
614
615
616static long setup_trampoline(unsigned int syscall, unsigned int __user *tramp)
617{
618 int i;
619 long err = 0;
620
621
622 err |= __put_user(PPC_RAW_BCTRL(), &tramp[0]);
623 err |= __put_user(PPC_RAW_ADDI(_R1, _R1, __SIGNAL_FRAMESIZE), &tramp[1]);
624
625 err |= __put_user(PPC_RAW_LI(_R0, syscall), &tramp[2]);
626 err |= __put_user(PPC_RAW_SC(), &tramp[3]);
627
628
629 for (i=TRAMP_TRACEBACK; i < TRAMP_SIZE ;i++)
630 err |= __put_user(0, &tramp[i]);
631
632 if (!err)
633 flush_icache_range((unsigned long) &tramp[0],
634 (unsigned long) &tramp[TRAMP_SIZE]);
635
636 return err;
637}
638
639
640
641
642
643#define UCONTEXTSIZEWITHOUTVSX \
644 (sizeof(struct ucontext) - 32*sizeof(long))
645
646
647
648
649SYSCALL_DEFINE3(swapcontext, struct ucontext __user *, old_ctx,
650 struct ucontext __user *, new_ctx, long, ctx_size)
651{
652 sigset_t set;
653 unsigned long new_msr = 0;
654 int ctx_has_vsx_region = 0;
655
656 if (new_ctx &&
657 get_user(new_msr, &new_ctx->uc_mcontext.gp_regs[PT_MSR]))
658 return -EFAULT;
659
660
661
662
663 if (ctx_size < UCONTEXTSIZEWITHOUTVSX)
664 return -EINVAL;
665
666
667
668
669 if ((ctx_size < sizeof(struct ucontext)) &&
670 (new_msr & MSR_VSX))
671 return -EINVAL;
672
673 if (ctx_size >= sizeof(struct ucontext))
674 ctx_has_vsx_region = 1;
675
676 if (old_ctx != NULL) {
677 prepare_setup_sigcontext(current);
678 if (!user_write_access_begin(old_ctx, ctx_size))
679 return -EFAULT;
680
681 unsafe_setup_sigcontext(&old_ctx->uc_mcontext, current, 0, NULL,
682 0, ctx_has_vsx_region, efault_out);
683 unsafe_copy_to_user(&old_ctx->uc_sigmask, ¤t->blocked,
684 sizeof(sigset_t), efault_out);
685
686 user_write_access_end();
687 }
688 if (new_ctx == NULL)
689 return 0;
690 if (!access_ok(new_ctx, ctx_size) ||
691 fault_in_pages_readable((u8 __user *)new_ctx, ctx_size))
692 return -EFAULT;
693
694
695
696
697
698
699
700
701
702
703
704
705
706 if (__get_user_sigset(&set, &new_ctx->uc_sigmask))
707 do_exit(SIGSEGV);
708 set_current_blocked(&set);
709
710 if (!user_read_access_begin(new_ctx, ctx_size))
711 return -EFAULT;
712 if (__unsafe_restore_sigcontext(current, NULL, 0, &new_ctx->uc_mcontext)) {
713 user_read_access_end();
714 do_exit(SIGSEGV);
715 }
716 user_read_access_end();
717
718
719 set_thread_flag(TIF_RESTOREALL);
720
721 return 0;
722
723efault_out:
724 user_write_access_end();
725 return -EFAULT;
726}
727
728
729
730
731
732
733SYSCALL_DEFINE0(rt_sigreturn)
734{
735 struct pt_regs *regs = current_pt_regs();
736 struct ucontext __user *uc = (struct ucontext __user *)regs->gpr[1];
737 sigset_t set;
738 unsigned long msr;
739
740
741 current->restart_block.fn = do_no_restart_syscall;
742
743 if (!access_ok(uc, sizeof(*uc)))
744 goto badframe;
745
746 if (__get_user_sigset(&set, &uc->uc_sigmask))
747 goto badframe;
748 set_current_blocked(&set);
749
750 if (IS_ENABLED(CONFIG_PPC_TRANSACTIONAL_MEM)) {
751
752
753
754
755
756
757
758
759
760
761 if (MSR_TM_SUSPENDED(mfmsr()))
762 tm_reclaim_current(0);
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787 regs_set_return_msr(regs, regs->msr & ~MSR_TS_MASK);
788
789 if (__get_user(msr, &uc->uc_mcontext.gp_regs[PT_MSR]))
790 goto badframe;
791 }
792
793 if (IS_ENABLED(CONFIG_PPC_TRANSACTIONAL_MEM) && MSR_TM_ACTIVE(msr)) {
794
795 struct ucontext __user *uc_transact;
796
797
798 if (!cpu_has_feature(CPU_FTR_TM))
799 goto badframe;
800
801 if (__get_user(uc_transact, &uc->uc_link))
802 goto badframe;
803 if (restore_tm_sigcontexts(current, &uc->uc_mcontext,
804 &uc_transact->uc_mcontext))
805 goto badframe;
806 } else {
807
808
809
810
811
812
813
814
815
816
817
818
819 regs_set_return_msr(current->thread.regs,
820 current->thread.regs->msr & ~MSR_TS_MASK);
821 if (!user_read_access_begin(&uc->uc_mcontext, sizeof(uc->uc_mcontext)))
822 goto badframe;
823
824 unsafe_restore_sigcontext(current, NULL, 1, &uc->uc_mcontext,
825 badframe_block);
826
827 user_read_access_end();
828 }
829
830 if (restore_altstack(&uc->uc_stack))
831 goto badframe;
832
833 set_thread_flag(TIF_RESTOREALL);
834
835 return 0;
836
837badframe_block:
838 user_read_access_end();
839badframe:
840 signal_fault(current, regs, "rt_sigreturn", uc);
841
842 force_sig(SIGSEGV);
843 return 0;
844}
845
846int handle_rt_signal64(struct ksignal *ksig, sigset_t *set,
847 struct task_struct *tsk)
848{
849 struct rt_sigframe __user *frame;
850 unsigned long newsp = 0;
851 long err = 0;
852 struct pt_regs *regs = tsk->thread.regs;
853
854 unsigned long msr = regs->msr;
855
856 frame = get_sigframe(ksig, tsk, sizeof(*frame), 0);
857
858
859
860
861
862 if (!MSR_TM_ACTIVE(msr))
863 prepare_setup_sigcontext(tsk);
864
865 if (!user_write_access_begin(frame, sizeof(*frame)))
866 goto badframe;
867
868 unsafe_put_user(&frame->info, &frame->pinfo, badframe_block);
869 unsafe_put_user(&frame->uc, &frame->puc, badframe_block);
870
871
872 unsafe_put_user(0, &frame->uc.uc_flags, badframe_block);
873 unsafe_save_altstack(&frame->uc.uc_stack, regs->gpr[1], badframe_block);
874
875 if (MSR_TM_ACTIVE(msr)) {
876#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
877
878
879
880 unsafe_put_user(&frame->uc_transact, &frame->uc.uc_link, badframe_block);
881
882 user_write_access_end();
883
884 err |= setup_tm_sigcontexts(&frame->uc.uc_mcontext,
885 &frame->uc_transact.uc_mcontext,
886 tsk, ksig->sig, NULL,
887 (unsigned long)ksig->ka.sa.sa_handler,
888 msr);
889
890 if (!user_write_access_begin(&frame->uc.uc_sigmask,
891 sizeof(frame->uc.uc_sigmask)))
892 goto badframe;
893
894#endif
895 } else {
896 unsafe_put_user(0, &frame->uc.uc_link, badframe_block);
897 unsafe_setup_sigcontext(&frame->uc.uc_mcontext, tsk, ksig->sig,
898 NULL, (unsigned long)ksig->ka.sa.sa_handler,
899 1, badframe_block);
900 }
901
902 unsafe_copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set), badframe_block);
903 user_write_access_end();
904
905
906 if (copy_siginfo_to_user(&frame->info, &ksig->info))
907 goto badframe;
908
909
910 tsk->thread.fp_state.fpscr = 0;
911
912
913 if (tsk->mm->context.vdso) {
914 regs_set_return_ip(regs, VDSO64_SYMBOL(tsk->mm->context.vdso, sigtramp_rt64));
915 } else {
916 err |= setup_trampoline(__NR_rt_sigreturn, &frame->tramp[0]);
917 if (err)
918 goto badframe;
919 regs_set_return_ip(regs, (unsigned long) &frame->tramp[0]);
920 }
921
922
923 newsp = ((unsigned long)frame) - __SIGNAL_FRAMESIZE;
924 err |= put_user(regs->gpr[1], (unsigned long __user *)newsp);
925
926
927 if (is_elf2_task()) {
928 regs->ctr = (unsigned long) ksig->ka.sa.sa_handler;
929 regs->gpr[12] = regs->ctr;
930 } else {
931
932
933
934
935
936 func_descr_t __user *funct_desc_ptr =
937 (func_descr_t __user *) ksig->ka.sa.sa_handler;
938
939 err |= get_user(regs->ctr, &funct_desc_ptr->entry);
940 err |= get_user(regs->gpr[2], &funct_desc_ptr->toc);
941 }
942
943
944 regs_set_return_msr(regs, (regs->msr & ~MSR_LE) | (MSR_KERNEL & MSR_LE));
945 regs->gpr[1] = newsp;
946 regs->gpr[3] = ksig->sig;
947 regs->result = 0;
948 if (ksig->ka.sa.sa_flags & SA_SIGINFO) {
949 regs->gpr[4] = (unsigned long)&frame->info;
950 regs->gpr[5] = (unsigned long)&frame->uc;
951 regs->gpr[6] = (unsigned long) frame;
952 } else {
953 regs->gpr[4] = (unsigned long)&frame->uc.uc_mcontext;
954 }
955 if (err)
956 goto badframe;
957
958 return 0;
959
960badframe_block:
961 user_write_access_end();
962badframe:
963 signal_fault(current, regs, "handle_rt_signal64", frame);
964
965 return 1;
966}
967