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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Signal handling for 32bit PPC and 32bit tasks on 64bit PPC
4 *
5 * PowerPC version
6 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
7 * Copyright (C) 2001 IBM
8 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
9 * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
10 *
11 * Derived from "arch/i386/kernel/signal.c"
12 * Copyright (C) 1991, 1992 Linus Torvalds
13 * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson
14 */
15
16#include <linux/sched.h>
17#include <linux/mm.h>
18#include <linux/smp.h>
19#include <linux/kernel.h>
20#include <linux/signal.h>
21#include <linux/errno.h>
22#include <linux/elf.h>
23#include <linux/ptrace.h>
24#include <linux/pagemap.h>
25#include <linux/ratelimit.h>
26#include <linux/syscalls.h>
27#ifdef CONFIG_PPC64
28#include <linux/compat.h>
29#else
30#include <linux/wait.h>
31#include <linux/unistd.h>
32#include <linux/stddef.h>
33#include <linux/tty.h>
34#include <linux/binfmts.h>
35#endif
36
37#include <linux/uaccess.h>
38#include <asm/cacheflush.h>
39#include <asm/syscalls.h>
40#include <asm/sigcontext.h>
41#include <asm/vdso.h>
42#include <asm/switch_to.h>
43#include <asm/tm.h>
44#include <asm/asm-prototypes.h>
45#ifdef CONFIG_PPC64
46#include "ppc32.h"
47#include <asm/unistd.h>
48#else
49#include <asm/ucontext.h>
50#endif
51
52#include "signal.h"
53
54
55#ifdef CONFIG_PPC64
56#define old_sigaction old_sigaction32
57#define sigcontext sigcontext32
58#define mcontext mcontext32
59#define ucontext ucontext32
60
61#define __save_altstack __compat_save_altstack
62
63/*
64 * Userspace code may pass a ucontext which doesn't include VSX added
65 * at the end. We need to check for this case.
66 */
67#define UCONTEXTSIZEWITHOUTVSX \
68 (sizeof(struct ucontext) - sizeof(elf_vsrreghalf_t32))
69
70/*
71 * Returning 0 means we return to userspace via
72 * ret_from_except and thus restore all user
73 * registers from *regs. This is what we need
74 * to do when a signal has been delivered.
75 */
76
77#define GP_REGS_SIZE min(sizeof(elf_gregset_t32), sizeof(struct pt_regs32))
78#undef __SIGNAL_FRAMESIZE
79#define __SIGNAL_FRAMESIZE __SIGNAL_FRAMESIZE32
80#undef ELF_NVRREG
81#define ELF_NVRREG ELF_NVRREG32
82
83/*
84 * Functions for flipping sigsets (thanks to brain dead generic
85 * implementation that makes things simple for little endian only)
86 */
87static inline int put_sigset_t(compat_sigset_t __user *uset, sigset_t *set)
88{
89 return put_compat_sigset(uset, set, sizeof(*uset));
90}
91
92static inline int get_sigset_t(sigset_t *set,
93 const compat_sigset_t __user *uset)
94{
95 return get_compat_sigset(set, uset);
96}
97
98#define to_user_ptr(p) ptr_to_compat(p)
99#define from_user_ptr(p) compat_ptr(p)
100
101static inline int save_general_regs(struct pt_regs *regs,
102 struct mcontext __user *frame)
103{
104 elf_greg_t64 *gregs = (elf_greg_t64 *)regs;
105 int val, i;
106
107 WARN_ON(!FULL_REGS(regs));
108
109 for (i = 0; i <= PT_RESULT; i ++) {
110 /* Force usr to alway see softe as 1 (interrupts enabled) */
111 if (i == PT_SOFTE)
112 val = 1;
113 else
114 val = gregs[i];
115
116 if (__put_user(val, &frame->mc_gregs[i]))
117 return -EFAULT;
118 }
119 return 0;
120}
121
122static inline int restore_general_regs(struct pt_regs *regs,
123 struct mcontext __user *sr)
124{
125 elf_greg_t64 *gregs = (elf_greg_t64 *)regs;
126 int i;
127
128 for (i = 0; i <= PT_RESULT; i++) {
129 if ((i == PT_MSR) || (i == PT_SOFTE))
130 continue;
131 if (__get_user(gregs[i], &sr->mc_gregs[i]))
132 return -EFAULT;
133 }
134 return 0;
135}
136
137#else /* CONFIG_PPC64 */
138
139#define GP_REGS_SIZE min(sizeof(elf_gregset_t), sizeof(struct pt_regs))
140
141static inline int put_sigset_t(sigset_t __user *uset, sigset_t *set)
142{
143 return copy_to_user(uset, set, sizeof(*uset));
144}
145
146static inline int get_sigset_t(sigset_t *set, const sigset_t __user *uset)
147{
148 return copy_from_user(set, uset, sizeof(*uset));
149}
150
151#define to_user_ptr(p) ((unsigned long)(p))
152#define from_user_ptr(p) ((void __user *)(p))
153
154static inline int save_general_regs(struct pt_regs *regs,
155 struct mcontext __user *frame)
156{
157 WARN_ON(!FULL_REGS(regs));
158 return __copy_to_user(&frame->mc_gregs, regs, GP_REGS_SIZE);
159}
160
161static inline int restore_general_regs(struct pt_regs *regs,
162 struct mcontext __user *sr)
163{
164 /* copy up to but not including MSR */
165 if (__copy_from_user(regs, &sr->mc_gregs,
166 PT_MSR * sizeof(elf_greg_t)))
167 return -EFAULT;
168 /* copy from orig_r3 (the word after the MSR) up to the end */
169 if (__copy_from_user(®s->orig_gpr3, &sr->mc_gregs[PT_ORIG_R3],
170 GP_REGS_SIZE - PT_ORIG_R3 * sizeof(elf_greg_t)))
171 return -EFAULT;
172 return 0;
173}
174#endif
175
176/*
177 * When we have signals to deliver, we set up on the
178 * user stack, going down from the original stack pointer:
179 * an ABI gap of 56 words
180 * an mcontext struct
181 * a sigcontext struct
182 * a gap of __SIGNAL_FRAMESIZE bytes
183 *
184 * Each of these things must be a multiple of 16 bytes in size. The following
185 * structure represent all of this except the __SIGNAL_FRAMESIZE gap
186 *
187 */
188struct sigframe {
189 struct sigcontext sctx; /* the sigcontext */
190 struct mcontext mctx; /* all the register values */
191#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
192 struct sigcontext sctx_transact;
193 struct mcontext mctx_transact;
194#endif
195 /*
196 * Programs using the rs6000/xcoff abi can save up to 19 gp
197 * regs and 18 fp regs below sp before decrementing it.
198 */
199 int abigap[56];
200};
201
202/* We use the mc_pad field for the signal return trampoline. */
203#define tramp mc_pad
204
205/*
206 * When we have rt signals to deliver, we set up on the
207 * user stack, going down from the original stack pointer:
208 * one rt_sigframe struct (siginfo + ucontext + ABI gap)
209 * a gap of __SIGNAL_FRAMESIZE+16 bytes
210 * (the +16 is to get the siginfo and ucontext in the same
211 * positions as in older kernels).
212 *
213 * Each of these things must be a multiple of 16 bytes in size.
214 *
215 */
216struct rt_sigframe {
217#ifdef CONFIG_PPC64
218 compat_siginfo_t info;
219#else
220 struct siginfo info;
221#endif
222 struct ucontext uc;
223#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
224 struct ucontext uc_transact;
225#endif
226 /*
227 * Programs using the rs6000/xcoff abi can save up to 19 gp
228 * regs and 18 fp regs below sp before decrementing it.
229 */
230 int abigap[56];
231};
232
233/*
234 * Save the current user registers on the user stack.
235 * We only save the altivec/spe registers if the process has used
236 * altivec/spe instructions at some point.
237 */
238static int save_user_regs(struct pt_regs *regs, struct mcontext __user *frame,
239 struct mcontext __user *tm_frame, int sigret,
240 int ctx_has_vsx_region)
241{
242 unsigned long msr = regs->msr;
243
244 /* Make sure floating point registers are stored in regs */
245 flush_fp_to_thread(current);
246
247 /* save general registers */
248 if (save_general_regs(regs, frame))
249 return 1;
250
251#ifdef CONFIG_ALTIVEC
252 /* save altivec registers */
253 if (current->thread.used_vr) {
254 flush_altivec_to_thread(current);
255 if (__copy_to_user(&frame->mc_vregs, ¤t->thread.vr_state,
256 ELF_NVRREG * sizeof(vector128)))
257 return 1;
258 /* set MSR_VEC in the saved MSR value to indicate that
259 frame->mc_vregs contains valid data */
260 msr |= MSR_VEC;
261 }
262 /* else assert((regs->msr & MSR_VEC) == 0) */
263
264 /* We always copy to/from vrsave, it's 0 if we don't have or don't
265 * use altivec. Since VSCR only contains 32 bits saved in the least
266 * significant bits of a vector, we "cheat" and stuff VRSAVE in the
267 * most significant bits of that same vector. --BenH
268 * Note that the current VRSAVE value is in the SPR at this point.
269 */
270 if (cpu_has_feature(CPU_FTR_ALTIVEC))
271 current->thread.vrsave = mfspr(SPRN_VRSAVE);
272 if (__put_user(current->thread.vrsave, (u32 __user *)&frame->mc_vregs[32]))
273 return 1;
274#endif /* CONFIG_ALTIVEC */
275 if (copy_fpr_to_user(&frame->mc_fregs, current))
276 return 1;
277
278 /*
279 * Clear the MSR VSX bit to indicate there is no valid state attached
280 * to this context, except in the specific case below where we set it.
281 */
282 msr &= ~MSR_VSX;
283#ifdef CONFIG_VSX
284 /*
285 * Copy VSR 0-31 upper half from thread_struct to local
286 * buffer, then write that to userspace. Also set MSR_VSX in
287 * the saved MSR value to indicate that frame->mc_vregs
288 * contains valid data
289 */
290 if (current->thread.used_vsr && ctx_has_vsx_region) {
291 flush_vsx_to_thread(current);
292 if (copy_vsx_to_user(&frame->mc_vsregs, current))
293 return 1;
294 msr |= MSR_VSX;
295 }
296#endif /* CONFIG_VSX */
297#ifdef CONFIG_SPE
298 /* save spe registers */
299 if (current->thread.used_spe) {
300 flush_spe_to_thread(current);
301 if (__copy_to_user(&frame->mc_vregs, current->thread.evr,
302 ELF_NEVRREG * sizeof(u32)))
303 return 1;
304 /* set MSR_SPE in the saved MSR value to indicate that
305 frame->mc_vregs contains valid data */
306 msr |= MSR_SPE;
307 }
308 /* else assert((regs->msr & MSR_SPE) == 0) */
309
310 /* We always copy to/from spefscr */
311 if (__put_user(current->thread.spefscr, (u32 __user *)&frame->mc_vregs + ELF_NEVRREG))
312 return 1;
313#endif /* CONFIG_SPE */
314
315 if (__put_user(msr, &frame->mc_gregs[PT_MSR]))
316 return 1;
317 /* We need to write 0 the MSR top 32 bits in the tm frame so that we
318 * can check it on the restore to see if TM is active
319 */
320 if (tm_frame && __put_user(0, &tm_frame->mc_gregs[PT_MSR]))
321 return 1;
322
323 if (sigret) {
324 /* Set up the sigreturn trampoline: li 0,sigret; sc */
325 if (__put_user(PPC_INST_ADDI + sigret, &frame->tramp[0])
326 || __put_user(PPC_INST_SC, &frame->tramp[1]))
327 return 1;
328 flush_icache_range((unsigned long) &frame->tramp[0],
329 (unsigned long) &frame->tramp[2]);
330 }
331
332 return 0;
333}
334
335#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
336/*
337 * Save the current user registers on the user stack.
338 * We only save the altivec/spe registers if the process has used
339 * altivec/spe instructions at some point.
340 * We also save the transactional registers to a second ucontext in the
341 * frame.
342 *
343 * See save_user_regs() and signal_64.c:setup_tm_sigcontexts().
344 */
345static int save_tm_user_regs(struct pt_regs *regs,
346 struct mcontext __user *frame,
347 struct mcontext __user *tm_frame, int sigret,
348 unsigned long msr)
349{
350 WARN_ON(tm_suspend_disabled);
351
352 /* Save both sets of general registers */
353 if (save_general_regs(¤t->thread.ckpt_regs, frame)
354 || save_general_regs(regs, tm_frame))
355 return 1;
356
357 /* Stash the top half of the 64bit MSR into the 32bit MSR word
358 * of the transactional mcontext. This way we have a backward-compatible
359 * MSR in the 'normal' (checkpointed) mcontext and additionally one can
360 * also look at what type of transaction (T or S) was active at the
361 * time of the signal.
362 */
363 if (__put_user((msr >> 32), &tm_frame->mc_gregs[PT_MSR]))
364 return 1;
365
366#ifdef CONFIG_ALTIVEC
367 /* save altivec registers */
368 if (current->thread.used_vr) {
369 if (__copy_to_user(&frame->mc_vregs, ¤t->thread.ckvr_state,
370 ELF_NVRREG * sizeof(vector128)))
371 return 1;
372 if (msr & MSR_VEC) {
373 if (__copy_to_user(&tm_frame->mc_vregs,
374 ¤t->thread.vr_state,
375 ELF_NVRREG * sizeof(vector128)))
376 return 1;
377 } else {
378 if (__copy_to_user(&tm_frame->mc_vregs,
379 ¤t->thread.ckvr_state,
380 ELF_NVRREG * sizeof(vector128)))
381 return 1;
382 }
383
384 /* set MSR_VEC in the saved MSR value to indicate that
385 * frame->mc_vregs contains valid data
386 */
387 msr |= MSR_VEC;
388 }
389
390 /* We always copy to/from vrsave, it's 0 if we don't have or don't
391 * use altivec. Since VSCR only contains 32 bits saved in the least
392 * significant bits of a vector, we "cheat" and stuff VRSAVE in the
393 * most significant bits of that same vector. --BenH
394 */
395 if (cpu_has_feature(CPU_FTR_ALTIVEC))
396 current->thread.ckvrsave = mfspr(SPRN_VRSAVE);
397 if (__put_user(current->thread.ckvrsave,
398 (u32 __user *)&frame->mc_vregs[32]))
399 return 1;
400 if (msr & MSR_VEC) {
401 if (__put_user(current->thread.vrsave,
402 (u32 __user *)&tm_frame->mc_vregs[32]))
403 return 1;
404 } else {
405 if (__put_user(current->thread.ckvrsave,
406 (u32 __user *)&tm_frame->mc_vregs[32]))
407 return 1;
408 }
409#endif /* CONFIG_ALTIVEC */
410
411 if (copy_ckfpr_to_user(&frame->mc_fregs, current))
412 return 1;
413 if (msr & MSR_FP) {
414 if (copy_fpr_to_user(&tm_frame->mc_fregs, current))
415 return 1;
416 } else {
417 if (copy_ckfpr_to_user(&tm_frame->mc_fregs, current))
418 return 1;
419 }
420
421#ifdef CONFIG_VSX
422 /*
423 * Copy VSR 0-31 upper half from thread_struct to local
424 * buffer, then write that to userspace. Also set MSR_VSX in
425 * the saved MSR value to indicate that frame->mc_vregs
426 * contains valid data
427 */
428 if (current->thread.used_vsr) {
429 if (copy_ckvsx_to_user(&frame->mc_vsregs, current))
430 return 1;
431 if (msr & MSR_VSX) {
432 if (copy_vsx_to_user(&tm_frame->mc_vsregs,
433 current))
434 return 1;
435 } else {
436 if (copy_ckvsx_to_user(&tm_frame->mc_vsregs, current))
437 return 1;
438 }
439
440 msr |= MSR_VSX;
441 }
442#endif /* CONFIG_VSX */
443#ifdef CONFIG_SPE
444 /* SPE regs are not checkpointed with TM, so this section is
445 * simply the same as in save_user_regs().
446 */
447 if (current->thread.used_spe) {
448 flush_spe_to_thread(current);
449 if (__copy_to_user(&frame->mc_vregs, current->thread.evr,
450 ELF_NEVRREG * sizeof(u32)))
451 return 1;
452 /* set MSR_SPE in the saved MSR value to indicate that
453 * frame->mc_vregs contains valid data */
454 msr |= MSR_SPE;
455 }
456
457 /* We always copy to/from spefscr */
458 if (__put_user(current->thread.spefscr, (u32 __user *)&frame->mc_vregs + ELF_NEVRREG))
459 return 1;
460#endif /* CONFIG_SPE */
461
462 if (__put_user(msr, &frame->mc_gregs[PT_MSR]))
463 return 1;
464 if (sigret) {
465 /* Set up the sigreturn trampoline: li 0,sigret; sc */
466 if (__put_user(PPC_INST_ADDI + sigret, &frame->tramp[0])
467 || __put_user(PPC_INST_SC, &frame->tramp[1]))
468 return 1;
469 flush_icache_range((unsigned long) &frame->tramp[0],
470 (unsigned long) &frame->tramp[2]);
471 }
472
473 return 0;
474}
475#endif
476
477/*
478 * Restore the current user register values from the user stack,
479 * (except for MSR).
480 */
481static long restore_user_regs(struct pt_regs *regs,
482 struct mcontext __user *sr, int sig)
483{
484 long err;
485 unsigned int save_r2 = 0;
486 unsigned long msr;
487#ifdef CONFIG_VSX
488 int i;
489#endif
490
491 /*
492 * restore general registers but not including MSR or SOFTE. Also
493 * take care of keeping r2 (TLS) intact if not a signal
494 */
495 if (!sig)
496 save_r2 = (unsigned int)regs->gpr[2];
497 err = restore_general_regs(regs, sr);
498 set_trap_norestart(regs);
499 err |= __get_user(msr, &sr->mc_gregs[PT_MSR]);
500 if (!sig)
501 regs->gpr[2] = (unsigned long) save_r2;
502 if (err)
503 return 1;
504
505 /* if doing signal return, restore the previous little-endian mode */
506 if (sig)
507 regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE);
508
509#ifdef CONFIG_ALTIVEC
510 /*
511 * Force the process to reload the altivec registers from
512 * current->thread when it next does altivec instructions
513 */
514 regs->msr &= ~MSR_VEC;
515 if (msr & MSR_VEC) {
516 /* restore altivec registers from the stack */
517 if (__copy_from_user(¤t->thread.vr_state, &sr->mc_vregs,
518 sizeof(sr->mc_vregs)))
519 return 1;
520 current->thread.used_vr = true;
521 } else if (current->thread.used_vr)
522 memset(¤t->thread.vr_state, 0,
523 ELF_NVRREG * sizeof(vector128));
524
525 /* Always get VRSAVE back */
526 if (__get_user(current->thread.vrsave, (u32 __user *)&sr->mc_vregs[32]))
527 return 1;
528 if (cpu_has_feature(CPU_FTR_ALTIVEC))
529 mtspr(SPRN_VRSAVE, current->thread.vrsave);
530#endif /* CONFIG_ALTIVEC */
531 if (copy_fpr_from_user(current, &sr->mc_fregs))
532 return 1;
533
534#ifdef CONFIG_VSX
535 /*
536 * Force the process to reload the VSX registers from
537 * current->thread when it next does VSX instruction.
538 */
539 regs->msr &= ~MSR_VSX;
540 if (msr & MSR_VSX) {
541 /*
542 * Restore altivec registers from the stack to a local
543 * buffer, then write this out to the thread_struct
544 */
545 if (copy_vsx_from_user(current, &sr->mc_vsregs))
546 return 1;
547 current->thread.used_vsr = true;
548 } else if (current->thread.used_vsr)
549 for (i = 0; i < 32 ; i++)
550 current->thread.fp_state.fpr[i][TS_VSRLOWOFFSET] = 0;
551#endif /* CONFIG_VSX */
552 /*
553 * force the process to reload the FP registers from
554 * current->thread when it next does FP instructions
555 */
556 regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1);
557
558#ifdef CONFIG_SPE
559 /* force the process to reload the spe registers from
560 current->thread when it next does spe instructions */
561 regs->msr &= ~MSR_SPE;
562 if (msr & MSR_SPE) {
563 /* restore spe registers from the stack */
564 if (__copy_from_user(current->thread.evr, &sr->mc_vregs,
565 ELF_NEVRREG * sizeof(u32)))
566 return 1;
567 current->thread.used_spe = true;
568 } else if (current->thread.used_spe)
569 memset(current->thread.evr, 0, ELF_NEVRREG * sizeof(u32));
570
571 /* Always get SPEFSCR back */
572 if (__get_user(current->thread.spefscr, (u32 __user *)&sr->mc_vregs + ELF_NEVRREG))
573 return 1;
574#endif /* CONFIG_SPE */
575
576 return 0;
577}
578
579#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
580/*
581 * Restore the current user register values from the user stack, except for
582 * MSR, and recheckpoint the original checkpointed register state for processes
583 * in transactions.
584 */
585static long restore_tm_user_regs(struct pt_regs *regs,
586 struct mcontext __user *sr,
587 struct mcontext __user *tm_sr)
588{
589 long err;
590 unsigned long msr, msr_hi;
591#ifdef CONFIG_VSX
592 int i;
593#endif
594
595 if (tm_suspend_disabled)
596 return 1;
597 /*
598 * restore general registers but not including MSR or SOFTE. Also
599 * take care of keeping r2 (TLS) intact if not a signal.
600 * See comment in signal_64.c:restore_tm_sigcontexts();
601 * TFHAR is restored from the checkpointed NIP; TEXASR and TFIAR
602 * were set by the signal delivery.
603 */
604 err = restore_general_regs(regs, tm_sr);
605 err |= restore_general_regs(¤t->thread.ckpt_regs, sr);
606
607 err |= __get_user(current->thread.tm_tfhar, &sr->mc_gregs[PT_NIP]);
608
609 err |= __get_user(msr, &sr->mc_gregs[PT_MSR]);
610 if (err)
611 return 1;
612
613 /* Restore the previous little-endian mode */
614 regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE);
615
616#ifdef CONFIG_ALTIVEC
617 regs->msr &= ~MSR_VEC;
618 if (msr & MSR_VEC) {
619 /* restore altivec registers from the stack */
620 if (__copy_from_user(¤t->thread.ckvr_state, &sr->mc_vregs,
621 sizeof(sr->mc_vregs)) ||
622 __copy_from_user(¤t->thread.vr_state,
623 &tm_sr->mc_vregs,
624 sizeof(sr->mc_vregs)))
625 return 1;
626 current->thread.used_vr = true;
627 } else if (current->thread.used_vr) {
628 memset(¤t->thread.vr_state, 0,
629 ELF_NVRREG * sizeof(vector128));
630 memset(¤t->thread.ckvr_state, 0,
631 ELF_NVRREG * sizeof(vector128));
632 }
633
634 /* Always get VRSAVE back */
635 if (__get_user(current->thread.ckvrsave,
636 (u32 __user *)&sr->mc_vregs[32]) ||
637 __get_user(current->thread.vrsave,
638 (u32 __user *)&tm_sr->mc_vregs[32]))
639 return 1;
640 if (cpu_has_feature(CPU_FTR_ALTIVEC))
641 mtspr(SPRN_VRSAVE, current->thread.ckvrsave);
642#endif /* CONFIG_ALTIVEC */
643
644 regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1);
645
646 if (copy_fpr_from_user(current, &sr->mc_fregs) ||
647 copy_ckfpr_from_user(current, &tm_sr->mc_fregs))
648 return 1;
649
650#ifdef CONFIG_VSX
651 regs->msr &= ~MSR_VSX;
652 if (msr & MSR_VSX) {
653 /*
654 * Restore altivec registers from the stack to a local
655 * buffer, then write this out to the thread_struct
656 */
657 if (copy_vsx_from_user(current, &tm_sr->mc_vsregs) ||
658 copy_ckvsx_from_user(current, &sr->mc_vsregs))
659 return 1;
660 current->thread.used_vsr = true;
661 } else if (current->thread.used_vsr)
662 for (i = 0; i < 32 ; i++) {
663 current->thread.fp_state.fpr[i][TS_VSRLOWOFFSET] = 0;
664 current->thread.ckfp_state.fpr[i][TS_VSRLOWOFFSET] = 0;
665 }
666#endif /* CONFIG_VSX */
667
668#ifdef CONFIG_SPE
669 /* SPE regs are not checkpointed with TM, so this section is
670 * simply the same as in restore_user_regs().
671 */
672 regs->msr &= ~MSR_SPE;
673 if (msr & MSR_SPE) {
674 if (__copy_from_user(current->thread.evr, &sr->mc_vregs,
675 ELF_NEVRREG * sizeof(u32)))
676 return 1;
677 current->thread.used_spe = true;
678 } else if (current->thread.used_spe)
679 memset(current->thread.evr, 0, ELF_NEVRREG * sizeof(u32));
680
681 /* Always get SPEFSCR back */
682 if (__get_user(current->thread.spefscr, (u32 __user *)&sr->mc_vregs
683 + ELF_NEVRREG))
684 return 1;
685#endif /* CONFIG_SPE */
686
687 /* Get the top half of the MSR from the user context */
688 if (__get_user(msr_hi, &tm_sr->mc_gregs[PT_MSR]))
689 return 1;
690 msr_hi <<= 32;
691 /* If TM bits are set to the reserved value, it's an invalid context */
692 if (MSR_TM_RESV(msr_hi))
693 return 1;
694
695 /*
696 * Disabling preemption, since it is unsafe to be preempted
697 * with MSR[TS] set without recheckpointing.
698 */
699 preempt_disable();
700
701 /*
702 * CAUTION:
703 * After regs->MSR[TS] being updated, make sure that get_user(),
704 * put_user() or similar functions are *not* called. These
705 * functions can generate page faults which will cause the process
706 * to be de-scheduled with MSR[TS] set but without calling
707 * tm_recheckpoint(). This can cause a bug.
708 *
709 * Pull in the MSR TM bits from the user context
710 */
711 regs->msr = (regs->msr & ~MSR_TS_MASK) | (msr_hi & MSR_TS_MASK);
712 /* Now, recheckpoint. This loads up all of the checkpointed (older)
713 * registers, including FP and V[S]Rs. After recheckpointing, the
714 * transactional versions should be loaded.
715 */
716 tm_enable();
717 /* Make sure the transaction is marked as failed */
718 current->thread.tm_texasr |= TEXASR_FS;
719 /* This loads the checkpointed FP/VEC state, if used */
720 tm_recheckpoint(¤t->thread);
721
722 /* This loads the speculative FP/VEC state, if used */
723 msr_check_and_set(msr & (MSR_FP | MSR_VEC));
724 if (msr & MSR_FP) {
725 load_fp_state(¤t->thread.fp_state);
726 regs->msr |= (MSR_FP | current->thread.fpexc_mode);
727 }
728#ifdef CONFIG_ALTIVEC
729 if (msr & MSR_VEC) {
730 load_vr_state(¤t->thread.vr_state);
731 regs->msr |= MSR_VEC;
732 }
733#endif
734
735 preempt_enable();
736
737 return 0;
738}
739#endif
740
741#ifdef CONFIG_PPC64
742
743#define copy_siginfo_to_user copy_siginfo_to_user32
744
745#endif /* CONFIG_PPC64 */
746
747/*
748 * Set up a signal frame for a "real-time" signal handler
749 * (one which gets siginfo).
750 */
751int handle_rt_signal32(struct ksignal *ksig, sigset_t *oldset,
752 struct task_struct *tsk)
753{
754 struct rt_sigframe __user *rt_sf;
755 struct mcontext __user *frame;
756 struct mcontext __user *tm_frame = NULL;
757 void __user *addr;
758 unsigned long newsp = 0;
759 int sigret;
760 unsigned long tramp;
761 struct pt_regs *regs = tsk->thread.regs;
762#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
763 /* Save the thread's msr before get_tm_stackpointer() changes it */
764 unsigned long msr = regs->msr;
765#endif
766
767 BUG_ON(tsk != current);
768
769 /* Set up Signal Frame */
770 /* Put a Real Time Context onto stack */
771 rt_sf = get_sigframe(ksig, get_tm_stackpointer(tsk), sizeof(*rt_sf), 1);
772 addr = rt_sf;
773 if (unlikely(rt_sf == NULL))
774 goto badframe;
775
776 /* Put the siginfo & fill in most of the ucontext */
777 if (copy_siginfo_to_user(&rt_sf->info, &ksig->info)
778 || __put_user(0, &rt_sf->uc.uc_flags)
779 || __save_altstack(&rt_sf->uc.uc_stack, regs->gpr[1])
780 || __put_user(to_user_ptr(&rt_sf->uc.uc_mcontext),
781 &rt_sf->uc.uc_regs)
782 || put_sigset_t(&rt_sf->uc.uc_sigmask, oldset))
783 goto badframe;
784
785 /* Save user registers on the stack */
786 frame = &rt_sf->uc.uc_mcontext;
787 addr = frame;
788 if (vdso32_rt_sigtramp && tsk->mm->context.vdso_base) {
789 sigret = 0;
790 tramp = tsk->mm->context.vdso_base + vdso32_rt_sigtramp;
791 } else {
792 sigret = __NR_rt_sigreturn;
793 tramp = (unsigned long) frame->tramp;
794 }
795
796#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
797 tm_frame = &rt_sf->uc_transact.uc_mcontext;
798 if (MSR_TM_ACTIVE(msr)) {
799 if (__put_user((unsigned long)&rt_sf->uc_transact,
800 &rt_sf->uc.uc_link) ||
801 __put_user((unsigned long)tm_frame,
802 &rt_sf->uc_transact.uc_regs))
803 goto badframe;
804 if (save_tm_user_regs(regs, frame, tm_frame, sigret, msr))
805 goto badframe;
806 }
807 else
808#endif
809 {
810 if (__put_user(0, &rt_sf->uc.uc_link))
811 goto badframe;
812 if (save_user_regs(regs, frame, tm_frame, sigret, 1))
813 goto badframe;
814 }
815 regs->link = tramp;
816
817 tsk->thread.fp_state.fpscr = 0; /* turn off all fp exceptions */
818
819 /* create a stack frame for the caller of the handler */
820 newsp = ((unsigned long)rt_sf) - (__SIGNAL_FRAMESIZE + 16);
821 addr = (void __user *)regs->gpr[1];
822 if (put_user(regs->gpr[1], (u32 __user *)newsp))
823 goto badframe;
824
825 /* Fill registers for signal handler */
826 regs->gpr[1] = newsp;
827 regs->gpr[3] = ksig->sig;
828 regs->gpr[4] = (unsigned long) &rt_sf->info;
829 regs->gpr[5] = (unsigned long) &rt_sf->uc;
830 regs->gpr[6] = (unsigned long) rt_sf;
831 regs->nip = (unsigned long) ksig->ka.sa.sa_handler;
832 /* enter the signal handler in native-endian mode */
833 regs->msr &= ~MSR_LE;
834 regs->msr |= (MSR_KERNEL & MSR_LE);
835 return 0;
836
837badframe:
838 if (show_unhandled_signals)
839 printk_ratelimited(KERN_INFO
840 "%s[%d]: bad frame in handle_rt_signal32: "
841 "%p nip %08lx lr %08lx\n",
842 tsk->comm, tsk->pid,
843 addr, regs->nip, regs->link);
844
845 return 1;
846}
847
848static int do_setcontext(struct ucontext __user *ucp, struct pt_regs *regs, int sig)
849{
850 sigset_t set;
851 struct mcontext __user *mcp;
852
853 if (get_sigset_t(&set, &ucp->uc_sigmask))
854 return -EFAULT;
855#ifdef CONFIG_PPC64
856 {
857 u32 cmcp;
858
859 if (__get_user(cmcp, &ucp->uc_regs))
860 return -EFAULT;
861 mcp = (struct mcontext __user *)(u64)cmcp;
862 /* no need to check access_ok(mcp), since mcp < 4GB */
863 }
864#else
865 if (__get_user(mcp, &ucp->uc_regs))
866 return -EFAULT;
867 if (!access_ok(mcp, sizeof(*mcp)))
868 return -EFAULT;
869#endif
870 set_current_blocked(&set);
871 if (restore_user_regs(regs, mcp, sig))
872 return -EFAULT;
873
874 return 0;
875}
876
877#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
878static int do_setcontext_tm(struct ucontext __user *ucp,
879 struct ucontext __user *tm_ucp,
880 struct pt_regs *regs)
881{
882 sigset_t set;
883 struct mcontext __user *mcp;
884 struct mcontext __user *tm_mcp;
885 u32 cmcp;
886 u32 tm_cmcp;
887
888 if (get_sigset_t(&set, &ucp->uc_sigmask))
889 return -EFAULT;
890
891 if (__get_user(cmcp, &ucp->uc_regs) ||
892 __get_user(tm_cmcp, &tm_ucp->uc_regs))
893 return -EFAULT;
894 mcp = (struct mcontext __user *)(u64)cmcp;
895 tm_mcp = (struct mcontext __user *)(u64)tm_cmcp;
896 /* no need to check access_ok(mcp), since mcp < 4GB */
897
898 set_current_blocked(&set);
899 if (restore_tm_user_regs(regs, mcp, tm_mcp))
900 return -EFAULT;
901
902 return 0;
903}
904#endif
905
906#ifdef CONFIG_PPC64
907COMPAT_SYSCALL_DEFINE3(swapcontext, struct ucontext __user *, old_ctx,
908 struct ucontext __user *, new_ctx, int, ctx_size)
909#else
910SYSCALL_DEFINE3(swapcontext, struct ucontext __user *, old_ctx,
911 struct ucontext __user *, new_ctx, long, ctx_size)
912#endif
913{
914 struct pt_regs *regs = current_pt_regs();
915 int ctx_has_vsx_region = 0;
916
917#ifdef CONFIG_PPC64
918 unsigned long new_msr = 0;
919
920 if (new_ctx) {
921 struct mcontext __user *mcp;
922 u32 cmcp;
923
924 /*
925 * Get pointer to the real mcontext. No need for
926 * access_ok since we are dealing with compat
927 * pointers.
928 */
929 if (__get_user(cmcp, &new_ctx->uc_regs))
930 return -EFAULT;
931 mcp = (struct mcontext __user *)(u64)cmcp;
932 if (__get_user(new_msr, &mcp->mc_gregs[PT_MSR]))
933 return -EFAULT;
934 }
935 /*
936 * Check that the context is not smaller than the original
937 * size (with VMX but without VSX)
938 */
939 if (ctx_size < UCONTEXTSIZEWITHOUTVSX)
940 return -EINVAL;
941 /*
942 * If the new context state sets the MSR VSX bits but
943 * it doesn't provide VSX state.
944 */
945 if ((ctx_size < sizeof(struct ucontext)) &&
946 (new_msr & MSR_VSX))
947 return -EINVAL;
948 /* Does the context have enough room to store VSX data? */
949 if (ctx_size >= sizeof(struct ucontext))
950 ctx_has_vsx_region = 1;
951#else
952 /* Context size is for future use. Right now, we only make sure
953 * we are passed something we understand
954 */
955 if (ctx_size < sizeof(struct ucontext))
956 return -EINVAL;
957#endif
958 if (old_ctx != NULL) {
959 struct mcontext __user *mctx;
960
961 /*
962 * old_ctx might not be 16-byte aligned, in which
963 * case old_ctx->uc_mcontext won't be either.
964 * Because we have the old_ctx->uc_pad2 field
965 * before old_ctx->uc_mcontext, we need to round down
966 * from &old_ctx->uc_mcontext to a 16-byte boundary.
967 */
968 mctx = (struct mcontext __user *)
969 ((unsigned long) &old_ctx->uc_mcontext & ~0xfUL);
970 if (!access_ok(old_ctx, ctx_size)
971 || save_user_regs(regs, mctx, NULL, 0, ctx_has_vsx_region)
972 || put_sigset_t(&old_ctx->uc_sigmask, ¤t->blocked)
973 || __put_user(to_user_ptr(mctx), &old_ctx->uc_regs))
974 return -EFAULT;
975 }
976 if (new_ctx == NULL)
977 return 0;
978 if (!access_ok(new_ctx, ctx_size) ||
979 fault_in_pages_readable((u8 __user *)new_ctx, ctx_size))
980 return -EFAULT;
981
982 /*
983 * If we get a fault copying the context into the kernel's
984 * image of the user's registers, we can't just return -EFAULT
985 * because the user's registers will be corrupted. For instance
986 * the NIP value may have been updated but not some of the
987 * other registers. Given that we have done the access_ok
988 * and successfully read the first and last bytes of the region
989 * above, this should only happen in an out-of-memory situation
990 * or if another thread unmaps the region containing the context.
991 * We kill the task with a SIGSEGV in this situation.
992 */
993 if (do_setcontext(new_ctx, regs, 0))
994 do_exit(SIGSEGV);
995
996 set_thread_flag(TIF_RESTOREALL);
997 return 0;
998}
999
1000#ifdef CONFIG_PPC64
1001COMPAT_SYSCALL_DEFINE0(rt_sigreturn)
1002#else
1003SYSCALL_DEFINE0(rt_sigreturn)
1004#endif
1005{
1006 struct rt_sigframe __user *rt_sf;
1007 struct pt_regs *regs = current_pt_regs();
1008 int tm_restore = 0;
1009#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1010 struct ucontext __user *uc_transact;
1011 unsigned long msr_hi;
1012 unsigned long tmp;
1013#endif
1014 /* Always make any pending restarted system calls return -EINTR */
1015 current->restart_block.fn = do_no_restart_syscall;
1016
1017 rt_sf = (struct rt_sigframe __user *)
1018 (regs->gpr[1] + __SIGNAL_FRAMESIZE + 16);
1019 if (!access_ok(rt_sf, sizeof(*rt_sf)))
1020 goto bad;
1021
1022#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1023 /*
1024 * If there is a transactional state then throw it away.
1025 * The purpose of a sigreturn is to destroy all traces of the
1026 * signal frame, this includes any transactional state created
1027 * within in. We only check for suspended as we can never be
1028 * active in the kernel, we are active, there is nothing better to
1029 * do than go ahead and Bad Thing later.
1030 * The cause is not important as there will never be a
1031 * recheckpoint so it's not user visible.
1032 */
1033 if (MSR_TM_SUSPENDED(mfmsr()))
1034 tm_reclaim_current(0);
1035
1036 if (__get_user(tmp, &rt_sf->uc.uc_link))
1037 goto bad;
1038 uc_transact = (struct ucontext __user *)(uintptr_t)tmp;
1039 if (uc_transact) {
1040 u32 cmcp;
1041 struct mcontext __user *mcp;
1042
1043 if (__get_user(cmcp, &uc_transact->uc_regs))
1044 return -EFAULT;
1045 mcp = (struct mcontext __user *)(u64)cmcp;
1046 /* The top 32 bits of the MSR are stashed in the transactional
1047 * ucontext. */
1048 if (__get_user(msr_hi, &mcp->mc_gregs[PT_MSR]))
1049 goto bad;
1050
1051 if (MSR_TM_ACTIVE(msr_hi<<32)) {
1052 /* Trying to start TM on non TM system */
1053 if (!cpu_has_feature(CPU_FTR_TM))
1054 goto bad;
1055 /* We only recheckpoint on return if we're
1056 * transaction.
1057 */
1058 tm_restore = 1;
1059 if (do_setcontext_tm(&rt_sf->uc, uc_transact, regs))
1060 goto bad;
1061 }
1062 }
1063 if (!tm_restore) {
1064 /*
1065 * Unset regs->msr because ucontext MSR TS is not
1066 * set, and recheckpoint was not called. This avoid
1067 * hitting a TM Bad thing at RFID
1068 */
1069 regs->msr &= ~MSR_TS_MASK;
1070 }
1071 /* Fall through, for non-TM restore */
1072#endif
1073 if (!tm_restore)
1074 if (do_setcontext(&rt_sf->uc, regs, 1))
1075 goto bad;
1076
1077 /*
1078 * It's not clear whether or why it is desirable to save the
1079 * sigaltstack setting on signal delivery and restore it on
1080 * signal return. But other architectures do this and we have
1081 * always done it up until now so it is probably better not to
1082 * change it. -- paulus
1083 */
1084#ifdef CONFIG_PPC64
1085 if (compat_restore_altstack(&rt_sf->uc.uc_stack))
1086 goto bad;
1087#else
1088 if (restore_altstack(&rt_sf->uc.uc_stack))
1089 goto bad;
1090#endif
1091 set_thread_flag(TIF_RESTOREALL);
1092 return 0;
1093
1094 bad:
1095 if (show_unhandled_signals)
1096 printk_ratelimited(KERN_INFO
1097 "%s[%d]: bad frame in sys_rt_sigreturn: "
1098 "%p nip %08lx lr %08lx\n",
1099 current->comm, current->pid,
1100 rt_sf, regs->nip, regs->link);
1101
1102 force_sig(SIGSEGV);
1103 return 0;
1104}
1105
1106#ifdef CONFIG_PPC32
1107SYSCALL_DEFINE3(debug_setcontext, struct ucontext __user *, ctx,
1108 int, ndbg, struct sig_dbg_op __user *, dbg)
1109{
1110 struct pt_regs *regs = current_pt_regs();
1111 struct sig_dbg_op op;
1112 int i;
1113 unsigned long new_msr = regs->msr;
1114#ifdef CONFIG_PPC_ADV_DEBUG_REGS
1115 unsigned long new_dbcr0 = current->thread.debug.dbcr0;
1116#endif
1117
1118 for (i=0; i<ndbg; i++) {
1119 if (copy_from_user(&op, dbg + i, sizeof(op)))
1120 return -EFAULT;
1121 switch (op.dbg_type) {
1122 case SIG_DBG_SINGLE_STEPPING:
1123#ifdef CONFIG_PPC_ADV_DEBUG_REGS
1124 if (op.dbg_value) {
1125 new_msr |= MSR_DE;
1126 new_dbcr0 |= (DBCR0_IDM | DBCR0_IC);
1127 } else {
1128 new_dbcr0 &= ~DBCR0_IC;
1129 if (!DBCR_ACTIVE_EVENTS(new_dbcr0,
1130 current->thread.debug.dbcr1)) {
1131 new_msr &= ~MSR_DE;
1132 new_dbcr0 &= ~DBCR0_IDM;
1133 }
1134 }
1135#else
1136 if (op.dbg_value)
1137 new_msr |= MSR_SE;
1138 else
1139 new_msr &= ~MSR_SE;
1140#endif
1141 break;
1142 case SIG_DBG_BRANCH_TRACING:
1143#ifdef CONFIG_PPC_ADV_DEBUG_REGS
1144 return -EINVAL;
1145#else
1146 if (op.dbg_value)
1147 new_msr |= MSR_BE;
1148 else
1149 new_msr &= ~MSR_BE;
1150#endif
1151 break;
1152
1153 default:
1154 return -EINVAL;
1155 }
1156 }
1157
1158 /* We wait until here to actually install the values in the
1159 registers so if we fail in the above loop, it will not
1160 affect the contents of these registers. After this point,
1161 failure is a problem, anyway, and it's very unlikely unless
1162 the user is really doing something wrong. */
1163 regs->msr = new_msr;
1164#ifdef CONFIG_PPC_ADV_DEBUG_REGS
1165 current->thread.debug.dbcr0 = new_dbcr0;
1166#endif
1167
1168 if (!access_ok(ctx, sizeof(*ctx)) ||
1169 fault_in_pages_readable((u8 __user *)ctx, sizeof(*ctx)))
1170 return -EFAULT;
1171
1172 /*
1173 * If we get a fault copying the context into the kernel's
1174 * image of the user's registers, we can't just return -EFAULT
1175 * because the user's registers will be corrupted. For instance
1176 * the NIP value may have been updated but not some of the
1177 * other registers. Given that we have done the access_ok
1178 * and successfully read the first and last bytes of the region
1179 * above, this should only happen in an out-of-memory situation
1180 * or if another thread unmaps the region containing the context.
1181 * We kill the task with a SIGSEGV in this situation.
1182 */
1183 if (do_setcontext(ctx, regs, 1)) {
1184 if (show_unhandled_signals)
1185 printk_ratelimited(KERN_INFO "%s[%d]: bad frame in "
1186 "sys_debug_setcontext: %p nip %08lx "
1187 "lr %08lx\n",
1188 current->comm, current->pid,
1189 ctx, regs->nip, regs->link);
1190
1191 force_sig(SIGSEGV);
1192 goto out;
1193 }
1194
1195 /*
1196 * It's not clear whether or why it is desirable to save the
1197 * sigaltstack setting on signal delivery and restore it on
1198 * signal return. But other architectures do this and we have
1199 * always done it up until now so it is probably better not to
1200 * change it. -- paulus
1201 */
1202 restore_altstack(&ctx->uc_stack);
1203
1204 set_thread_flag(TIF_RESTOREALL);
1205 out:
1206 return 0;
1207}
1208#endif
1209
1210/*
1211 * OK, we're invoking a handler
1212 */
1213int handle_signal32(struct ksignal *ksig, sigset_t *oldset,
1214 struct task_struct *tsk)
1215{
1216 struct sigcontext __user *sc;
1217 struct sigframe __user *frame;
1218 struct mcontext __user *tm_mctx = NULL;
1219 unsigned long newsp = 0;
1220 int sigret;
1221 unsigned long tramp;
1222 struct pt_regs *regs = tsk->thread.regs;
1223#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1224 /* Save the thread's msr before get_tm_stackpointer() changes it */
1225 unsigned long msr = regs->msr;
1226#endif
1227
1228 BUG_ON(tsk != current);
1229
1230 /* Set up Signal Frame */
1231 frame = get_sigframe(ksig, get_tm_stackpointer(tsk), sizeof(*frame), 1);
1232 if (unlikely(frame == NULL))
1233 goto badframe;
1234 sc = (struct sigcontext __user *) &frame->sctx;
1235
1236#if _NSIG != 64
1237#error "Please adjust handle_signal()"
1238#endif
1239 if (__put_user(to_user_ptr(ksig->ka.sa.sa_handler), &sc->handler)
1240 || __put_user(oldset->sig[0], &sc->oldmask)
1241#ifdef CONFIG_PPC64
1242 || __put_user((oldset->sig[0] >> 32), &sc->_unused[3])
1243#else
1244 || __put_user(oldset->sig[1], &sc->_unused[3])
1245#endif
1246 || __put_user(to_user_ptr(&frame->mctx), &sc->regs)
1247 || __put_user(ksig->sig, &sc->signal))
1248 goto badframe;
1249
1250 if (vdso32_sigtramp && tsk->mm->context.vdso_base) {
1251 sigret = 0;
1252 tramp = tsk->mm->context.vdso_base + vdso32_sigtramp;
1253 } else {
1254 sigret = __NR_sigreturn;
1255 tramp = (unsigned long) frame->mctx.tramp;
1256 }
1257
1258#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1259 tm_mctx = &frame->mctx_transact;
1260 if (MSR_TM_ACTIVE(msr)) {
1261 if (save_tm_user_regs(regs, &frame->mctx, &frame->mctx_transact,
1262 sigret, msr))
1263 goto badframe;
1264 }
1265 else
1266#endif
1267 {
1268 if (save_user_regs(regs, &frame->mctx, tm_mctx, sigret, 1))
1269 goto badframe;
1270 }
1271
1272 regs->link = tramp;
1273
1274 tsk->thread.fp_state.fpscr = 0; /* turn off all fp exceptions */
1275
1276 /* create a stack frame for the caller of the handler */
1277 newsp = ((unsigned long)frame) - __SIGNAL_FRAMESIZE;
1278 if (put_user(regs->gpr[1], (u32 __user *)newsp))
1279 goto badframe;
1280
1281 regs->gpr[1] = newsp;
1282 regs->gpr[3] = ksig->sig;
1283 regs->gpr[4] = (unsigned long) sc;
1284 regs->nip = (unsigned long) (unsigned long)ksig->ka.sa.sa_handler;
1285 /* enter the signal handler in big-endian mode */
1286 regs->msr &= ~MSR_LE;
1287 return 0;
1288
1289badframe:
1290 if (show_unhandled_signals)
1291 printk_ratelimited(KERN_INFO
1292 "%s[%d]: bad frame in handle_signal32: "
1293 "%p nip %08lx lr %08lx\n",
1294 tsk->comm, tsk->pid,
1295 frame, regs->nip, regs->link);
1296
1297 return 1;
1298}
1299
1300/*
1301 * Do a signal return; undo the signal stack.
1302 */
1303#ifdef CONFIG_PPC64
1304COMPAT_SYSCALL_DEFINE0(sigreturn)
1305#else
1306SYSCALL_DEFINE0(sigreturn)
1307#endif
1308{
1309 struct pt_regs *regs = current_pt_regs();
1310 struct sigframe __user *sf;
1311 struct sigcontext __user *sc;
1312 struct sigcontext sigctx;
1313 struct mcontext __user *sr;
1314 void __user *addr;
1315 sigset_t set;
1316#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1317 struct mcontext __user *mcp, *tm_mcp;
1318 unsigned long msr_hi;
1319#endif
1320
1321 /* Always make any pending restarted system calls return -EINTR */
1322 current->restart_block.fn = do_no_restart_syscall;
1323
1324 sf = (struct sigframe __user *)(regs->gpr[1] + __SIGNAL_FRAMESIZE);
1325 sc = &sf->sctx;
1326 addr = sc;
1327 if (copy_from_user(&sigctx, sc, sizeof(sigctx)))
1328 goto badframe;
1329
1330#ifdef CONFIG_PPC64
1331 /*
1332 * Note that PPC32 puts the upper 32 bits of the sigmask in the
1333 * unused part of the signal stackframe
1334 */
1335 set.sig[0] = sigctx.oldmask + ((long)(sigctx._unused[3]) << 32);
1336#else
1337 set.sig[0] = sigctx.oldmask;
1338 set.sig[1] = sigctx._unused[3];
1339#endif
1340 set_current_blocked(&set);
1341
1342#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1343 mcp = (struct mcontext __user *)&sf->mctx;
1344 tm_mcp = (struct mcontext __user *)&sf->mctx_transact;
1345 if (__get_user(msr_hi, &tm_mcp->mc_gregs[PT_MSR]))
1346 goto badframe;
1347 if (MSR_TM_ACTIVE(msr_hi<<32)) {
1348 if (!cpu_has_feature(CPU_FTR_TM))
1349 goto badframe;
1350 if (restore_tm_user_regs(regs, mcp, tm_mcp))
1351 goto badframe;
1352 } else
1353#endif
1354 {
1355 sr = (struct mcontext __user *)from_user_ptr(sigctx.regs);
1356 addr = sr;
1357 if (!access_ok(sr, sizeof(*sr))
1358 || restore_user_regs(regs, sr, 1))
1359 goto badframe;
1360 }
1361
1362 set_thread_flag(TIF_RESTOREALL);
1363 return 0;
1364
1365badframe:
1366 if (show_unhandled_signals)
1367 printk_ratelimited(KERN_INFO
1368 "%s[%d]: bad frame in sys_sigreturn: "
1369 "%p nip %08lx lr %08lx\n",
1370 current->comm, current->pid,
1371 addr, regs->nip, regs->link);
1372
1373 force_sig(SIGSEGV);
1374 return 0;
1375}
1/*
2 * Signal handling for 32bit PPC and 32bit tasks on 64bit PPC
3 *
4 * PowerPC version
5 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
6 * Copyright (C) 2001 IBM
7 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
8 * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
9 *
10 * Derived from "arch/i386/kernel/signal.c"
11 * Copyright (C) 1991, 1992 Linus Torvalds
12 * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson
13 *
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License
16 * as published by the Free Software Foundation; either version
17 * 2 of the License, or (at your option) any later version.
18 */
19
20#include <linux/sched.h>
21#include <linux/mm.h>
22#include <linux/smp.h>
23#include <linux/kernel.h>
24#include <linux/signal.h>
25#include <linux/errno.h>
26#include <linux/elf.h>
27#include <linux/ptrace.h>
28#include <linux/ratelimit.h>
29#ifdef CONFIG_PPC64
30#include <linux/syscalls.h>
31#include <linux/compat.h>
32#else
33#include <linux/wait.h>
34#include <linux/unistd.h>
35#include <linux/stddef.h>
36#include <linux/tty.h>
37#include <linux/binfmts.h>
38#endif
39
40#include <linux/uaccess.h>
41#include <asm/cacheflush.h>
42#include <asm/syscalls.h>
43#include <asm/sigcontext.h>
44#include <asm/vdso.h>
45#include <asm/switch_to.h>
46#include <asm/tm.h>
47#include <asm/asm-prototypes.h>
48#ifdef CONFIG_PPC64
49#include "ppc32.h"
50#include <asm/unistd.h>
51#else
52#include <asm/ucontext.h>
53#include <asm/pgtable.h>
54#endif
55
56#include "signal.h"
57
58
59#ifdef CONFIG_PPC64
60#define sys_rt_sigreturn compat_sys_rt_sigreturn
61#define sys_swapcontext compat_sys_swapcontext
62#define sys_sigreturn compat_sys_sigreturn
63
64#define old_sigaction old_sigaction32
65#define sigcontext sigcontext32
66#define mcontext mcontext32
67#define ucontext ucontext32
68
69#define __save_altstack __compat_save_altstack
70
71/*
72 * Userspace code may pass a ucontext which doesn't include VSX added
73 * at the end. We need to check for this case.
74 */
75#define UCONTEXTSIZEWITHOUTVSX \
76 (sizeof(struct ucontext) - sizeof(elf_vsrreghalf_t32))
77
78/*
79 * Returning 0 means we return to userspace via
80 * ret_from_except and thus restore all user
81 * registers from *regs. This is what we need
82 * to do when a signal has been delivered.
83 */
84
85#define GP_REGS_SIZE min(sizeof(elf_gregset_t32), sizeof(struct pt_regs32))
86#undef __SIGNAL_FRAMESIZE
87#define __SIGNAL_FRAMESIZE __SIGNAL_FRAMESIZE32
88#undef ELF_NVRREG
89#define ELF_NVRREG ELF_NVRREG32
90
91/*
92 * Functions for flipping sigsets (thanks to brain dead generic
93 * implementation that makes things simple for little endian only)
94 */
95static inline int put_sigset_t(compat_sigset_t __user *uset, sigset_t *set)
96{
97 return put_compat_sigset(uset, set, sizeof(*uset));
98}
99
100static inline int get_sigset_t(sigset_t *set,
101 const compat_sigset_t __user *uset)
102{
103 return get_compat_sigset(set, uset);
104}
105
106#define to_user_ptr(p) ptr_to_compat(p)
107#define from_user_ptr(p) compat_ptr(p)
108
109static inline int save_general_regs(struct pt_regs *regs,
110 struct mcontext __user *frame)
111{
112 elf_greg_t64 *gregs = (elf_greg_t64 *)regs;
113 int i;
114 /* Force usr to alway see softe as 1 (interrupts enabled) */
115 elf_greg_t64 softe = 0x1;
116
117 WARN_ON(!FULL_REGS(regs));
118
119 for (i = 0; i <= PT_RESULT; i ++) {
120 if (i == 14 && !FULL_REGS(regs))
121 i = 32;
122 if ( i == PT_SOFTE) {
123 if(__put_user((unsigned int)softe, &frame->mc_gregs[i]))
124 return -EFAULT;
125 else
126 continue;
127 }
128 if (__put_user((unsigned int)gregs[i], &frame->mc_gregs[i]))
129 return -EFAULT;
130 }
131 return 0;
132}
133
134static inline int restore_general_regs(struct pt_regs *regs,
135 struct mcontext __user *sr)
136{
137 elf_greg_t64 *gregs = (elf_greg_t64 *)regs;
138 int i;
139
140 for (i = 0; i <= PT_RESULT; i++) {
141 if ((i == PT_MSR) || (i == PT_SOFTE))
142 continue;
143 if (__get_user(gregs[i], &sr->mc_gregs[i]))
144 return -EFAULT;
145 }
146 return 0;
147}
148
149#else /* CONFIG_PPC64 */
150
151#define GP_REGS_SIZE min(sizeof(elf_gregset_t), sizeof(struct pt_regs))
152
153static inline int put_sigset_t(sigset_t __user *uset, sigset_t *set)
154{
155 return copy_to_user(uset, set, sizeof(*uset));
156}
157
158static inline int get_sigset_t(sigset_t *set, const sigset_t __user *uset)
159{
160 return copy_from_user(set, uset, sizeof(*uset));
161}
162
163#define to_user_ptr(p) ((unsigned long)(p))
164#define from_user_ptr(p) ((void __user *)(p))
165
166static inline int save_general_regs(struct pt_regs *regs,
167 struct mcontext __user *frame)
168{
169 WARN_ON(!FULL_REGS(regs));
170 return __copy_to_user(&frame->mc_gregs, regs, GP_REGS_SIZE);
171}
172
173static inline int restore_general_regs(struct pt_regs *regs,
174 struct mcontext __user *sr)
175{
176 /* copy up to but not including MSR */
177 if (__copy_from_user(regs, &sr->mc_gregs,
178 PT_MSR * sizeof(elf_greg_t)))
179 return -EFAULT;
180 /* copy from orig_r3 (the word after the MSR) up to the end */
181 if (__copy_from_user(®s->orig_gpr3, &sr->mc_gregs[PT_ORIG_R3],
182 GP_REGS_SIZE - PT_ORIG_R3 * sizeof(elf_greg_t)))
183 return -EFAULT;
184 return 0;
185}
186#endif
187
188/*
189 * When we have signals to deliver, we set up on the
190 * user stack, going down from the original stack pointer:
191 * an ABI gap of 56 words
192 * an mcontext struct
193 * a sigcontext struct
194 * a gap of __SIGNAL_FRAMESIZE bytes
195 *
196 * Each of these things must be a multiple of 16 bytes in size. The following
197 * structure represent all of this except the __SIGNAL_FRAMESIZE gap
198 *
199 */
200struct sigframe {
201 struct sigcontext sctx; /* the sigcontext */
202 struct mcontext mctx; /* all the register values */
203#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
204 struct sigcontext sctx_transact;
205 struct mcontext mctx_transact;
206#endif
207 /*
208 * Programs using the rs6000/xcoff abi can save up to 19 gp
209 * regs and 18 fp regs below sp before decrementing it.
210 */
211 int abigap[56];
212};
213
214/* We use the mc_pad field for the signal return trampoline. */
215#define tramp mc_pad
216
217/*
218 * When we have rt signals to deliver, we set up on the
219 * user stack, going down from the original stack pointer:
220 * one rt_sigframe struct (siginfo + ucontext + ABI gap)
221 * a gap of __SIGNAL_FRAMESIZE+16 bytes
222 * (the +16 is to get the siginfo and ucontext in the same
223 * positions as in older kernels).
224 *
225 * Each of these things must be a multiple of 16 bytes in size.
226 *
227 */
228struct rt_sigframe {
229#ifdef CONFIG_PPC64
230 compat_siginfo_t info;
231#else
232 struct siginfo info;
233#endif
234 struct ucontext uc;
235#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
236 struct ucontext uc_transact;
237#endif
238 /*
239 * Programs using the rs6000/xcoff abi can save up to 19 gp
240 * regs and 18 fp regs below sp before decrementing it.
241 */
242 int abigap[56];
243};
244
245#ifdef CONFIG_VSX
246unsigned long copy_fpr_to_user(void __user *to,
247 struct task_struct *task)
248{
249 u64 buf[ELF_NFPREG];
250 int i;
251
252 /* save FPR copy to local buffer then write to the thread_struct */
253 for (i = 0; i < (ELF_NFPREG - 1) ; i++)
254 buf[i] = task->thread.TS_FPR(i);
255 buf[i] = task->thread.fp_state.fpscr;
256 return __copy_to_user(to, buf, ELF_NFPREG * sizeof(double));
257}
258
259unsigned long copy_fpr_from_user(struct task_struct *task,
260 void __user *from)
261{
262 u64 buf[ELF_NFPREG];
263 int i;
264
265 if (__copy_from_user(buf, from, ELF_NFPREG * sizeof(double)))
266 return 1;
267 for (i = 0; i < (ELF_NFPREG - 1) ; i++)
268 task->thread.TS_FPR(i) = buf[i];
269 task->thread.fp_state.fpscr = buf[i];
270
271 return 0;
272}
273
274unsigned long copy_vsx_to_user(void __user *to,
275 struct task_struct *task)
276{
277 u64 buf[ELF_NVSRHALFREG];
278 int i;
279
280 /* save FPR copy to local buffer then write to the thread_struct */
281 for (i = 0; i < ELF_NVSRHALFREG; i++)
282 buf[i] = task->thread.fp_state.fpr[i][TS_VSRLOWOFFSET];
283 return __copy_to_user(to, buf, ELF_NVSRHALFREG * sizeof(double));
284}
285
286unsigned long copy_vsx_from_user(struct task_struct *task,
287 void __user *from)
288{
289 u64 buf[ELF_NVSRHALFREG];
290 int i;
291
292 if (__copy_from_user(buf, from, ELF_NVSRHALFREG * sizeof(double)))
293 return 1;
294 for (i = 0; i < ELF_NVSRHALFREG ; i++)
295 task->thread.fp_state.fpr[i][TS_VSRLOWOFFSET] = buf[i];
296 return 0;
297}
298
299#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
300unsigned long copy_ckfpr_to_user(void __user *to,
301 struct task_struct *task)
302{
303 u64 buf[ELF_NFPREG];
304 int i;
305
306 /* save FPR copy to local buffer then write to the thread_struct */
307 for (i = 0; i < (ELF_NFPREG - 1) ; i++)
308 buf[i] = task->thread.TS_CKFPR(i);
309 buf[i] = task->thread.ckfp_state.fpscr;
310 return __copy_to_user(to, buf, ELF_NFPREG * sizeof(double));
311}
312
313unsigned long copy_ckfpr_from_user(struct task_struct *task,
314 void __user *from)
315{
316 u64 buf[ELF_NFPREG];
317 int i;
318
319 if (__copy_from_user(buf, from, ELF_NFPREG * sizeof(double)))
320 return 1;
321 for (i = 0; i < (ELF_NFPREG - 1) ; i++)
322 task->thread.TS_CKFPR(i) = buf[i];
323 task->thread.ckfp_state.fpscr = buf[i];
324
325 return 0;
326}
327
328unsigned long copy_ckvsx_to_user(void __user *to,
329 struct task_struct *task)
330{
331 u64 buf[ELF_NVSRHALFREG];
332 int i;
333
334 /* save FPR copy to local buffer then write to the thread_struct */
335 for (i = 0; i < ELF_NVSRHALFREG; i++)
336 buf[i] = task->thread.ckfp_state.fpr[i][TS_VSRLOWOFFSET];
337 return __copy_to_user(to, buf, ELF_NVSRHALFREG * sizeof(double));
338}
339
340unsigned long copy_ckvsx_from_user(struct task_struct *task,
341 void __user *from)
342{
343 u64 buf[ELF_NVSRHALFREG];
344 int i;
345
346 if (__copy_from_user(buf, from, ELF_NVSRHALFREG * sizeof(double)))
347 return 1;
348 for (i = 0; i < ELF_NVSRHALFREG ; i++)
349 task->thread.ckfp_state.fpr[i][TS_VSRLOWOFFSET] = buf[i];
350 return 0;
351}
352#endif /* CONFIG_PPC_TRANSACTIONAL_MEM */
353#else
354inline unsigned long copy_fpr_to_user(void __user *to,
355 struct task_struct *task)
356{
357 return __copy_to_user(to, task->thread.fp_state.fpr,
358 ELF_NFPREG * sizeof(double));
359}
360
361inline unsigned long copy_fpr_from_user(struct task_struct *task,
362 void __user *from)
363{
364 return __copy_from_user(task->thread.fp_state.fpr, from,
365 ELF_NFPREG * sizeof(double));
366}
367
368#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
369inline unsigned long copy_ckfpr_to_user(void __user *to,
370 struct task_struct *task)
371{
372 return __copy_to_user(to, task->thread.ckfp_state.fpr,
373 ELF_NFPREG * sizeof(double));
374}
375
376inline unsigned long copy_ckfpr_from_user(struct task_struct *task,
377 void __user *from)
378{
379 return __copy_from_user(task->thread.ckfp_state.fpr, from,
380 ELF_NFPREG * sizeof(double));
381}
382#endif /* CONFIG_PPC_TRANSACTIONAL_MEM */
383#endif
384
385/*
386 * Save the current user registers on the user stack.
387 * We only save the altivec/spe registers if the process has used
388 * altivec/spe instructions at some point.
389 */
390static int save_user_regs(struct pt_regs *regs, struct mcontext __user *frame,
391 struct mcontext __user *tm_frame, int sigret,
392 int ctx_has_vsx_region)
393{
394 unsigned long msr = regs->msr;
395
396 /* Make sure floating point registers are stored in regs */
397 flush_fp_to_thread(current);
398
399 /* save general registers */
400 if (save_general_regs(regs, frame))
401 return 1;
402
403#ifdef CONFIG_ALTIVEC
404 /* save altivec registers */
405 if (current->thread.used_vr) {
406 flush_altivec_to_thread(current);
407 if (__copy_to_user(&frame->mc_vregs, ¤t->thread.vr_state,
408 ELF_NVRREG * sizeof(vector128)))
409 return 1;
410 /* set MSR_VEC in the saved MSR value to indicate that
411 frame->mc_vregs contains valid data */
412 msr |= MSR_VEC;
413 }
414 /* else assert((regs->msr & MSR_VEC) == 0) */
415
416 /* We always copy to/from vrsave, it's 0 if we don't have or don't
417 * use altivec. Since VSCR only contains 32 bits saved in the least
418 * significant bits of a vector, we "cheat" and stuff VRSAVE in the
419 * most significant bits of that same vector. --BenH
420 * Note that the current VRSAVE value is in the SPR at this point.
421 */
422 if (cpu_has_feature(CPU_FTR_ALTIVEC))
423 current->thread.vrsave = mfspr(SPRN_VRSAVE);
424 if (__put_user(current->thread.vrsave, (u32 __user *)&frame->mc_vregs[32]))
425 return 1;
426#endif /* CONFIG_ALTIVEC */
427 if (copy_fpr_to_user(&frame->mc_fregs, current))
428 return 1;
429
430 /*
431 * Clear the MSR VSX bit to indicate there is no valid state attached
432 * to this context, except in the specific case below where we set it.
433 */
434 msr &= ~MSR_VSX;
435#ifdef CONFIG_VSX
436 /*
437 * Copy VSR 0-31 upper half from thread_struct to local
438 * buffer, then write that to userspace. Also set MSR_VSX in
439 * the saved MSR value to indicate that frame->mc_vregs
440 * contains valid data
441 */
442 if (current->thread.used_vsr && ctx_has_vsx_region) {
443 flush_vsx_to_thread(current);
444 if (copy_vsx_to_user(&frame->mc_vsregs, current))
445 return 1;
446 msr |= MSR_VSX;
447 }
448#endif /* CONFIG_VSX */
449#ifdef CONFIG_SPE
450 /* save spe registers */
451 if (current->thread.used_spe) {
452 flush_spe_to_thread(current);
453 if (__copy_to_user(&frame->mc_vregs, current->thread.evr,
454 ELF_NEVRREG * sizeof(u32)))
455 return 1;
456 /* set MSR_SPE in the saved MSR value to indicate that
457 frame->mc_vregs contains valid data */
458 msr |= MSR_SPE;
459 }
460 /* else assert((regs->msr & MSR_SPE) == 0) */
461
462 /* We always copy to/from spefscr */
463 if (__put_user(current->thread.spefscr, (u32 __user *)&frame->mc_vregs + ELF_NEVRREG))
464 return 1;
465#endif /* CONFIG_SPE */
466
467 if (__put_user(msr, &frame->mc_gregs[PT_MSR]))
468 return 1;
469 /* We need to write 0 the MSR top 32 bits in the tm frame so that we
470 * can check it on the restore to see if TM is active
471 */
472 if (tm_frame && __put_user(0, &tm_frame->mc_gregs[PT_MSR]))
473 return 1;
474
475 if (sigret) {
476 /* Set up the sigreturn trampoline: li r0,sigret; sc */
477 if (__put_user(0x38000000UL + sigret, &frame->tramp[0])
478 || __put_user(0x44000002UL, &frame->tramp[1]))
479 return 1;
480 flush_icache_range((unsigned long) &frame->tramp[0],
481 (unsigned long) &frame->tramp[2]);
482 }
483
484 return 0;
485}
486
487#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
488/*
489 * Save the current user registers on the user stack.
490 * We only save the altivec/spe registers if the process has used
491 * altivec/spe instructions at some point.
492 * We also save the transactional registers to a second ucontext in the
493 * frame.
494 *
495 * See save_user_regs() and signal_64.c:setup_tm_sigcontexts().
496 */
497static int save_tm_user_regs(struct pt_regs *regs,
498 struct mcontext __user *frame,
499 struct mcontext __user *tm_frame, int sigret)
500{
501 unsigned long msr = regs->msr;
502
503 WARN_ON(tm_suspend_disabled);
504
505 /* Remove TM bits from thread's MSR. The MSR in the sigcontext
506 * just indicates to userland that we were doing a transaction, but we
507 * don't want to return in transactional state. This also ensures
508 * that flush_fp_to_thread won't set TIF_RESTORE_TM again.
509 */
510 regs->msr &= ~MSR_TS_MASK;
511
512 /* Save both sets of general registers */
513 if (save_general_regs(¤t->thread.ckpt_regs, frame)
514 || save_general_regs(regs, tm_frame))
515 return 1;
516
517 /* Stash the top half of the 64bit MSR into the 32bit MSR word
518 * of the transactional mcontext. This way we have a backward-compatible
519 * MSR in the 'normal' (checkpointed) mcontext and additionally one can
520 * also look at what type of transaction (T or S) was active at the
521 * time of the signal.
522 */
523 if (__put_user((msr >> 32), &tm_frame->mc_gregs[PT_MSR]))
524 return 1;
525
526#ifdef CONFIG_ALTIVEC
527 /* save altivec registers */
528 if (current->thread.used_vr) {
529 if (__copy_to_user(&frame->mc_vregs, ¤t->thread.ckvr_state,
530 ELF_NVRREG * sizeof(vector128)))
531 return 1;
532 if (msr & MSR_VEC) {
533 if (__copy_to_user(&tm_frame->mc_vregs,
534 ¤t->thread.vr_state,
535 ELF_NVRREG * sizeof(vector128)))
536 return 1;
537 } else {
538 if (__copy_to_user(&tm_frame->mc_vregs,
539 ¤t->thread.ckvr_state,
540 ELF_NVRREG * sizeof(vector128)))
541 return 1;
542 }
543
544 /* set MSR_VEC in the saved MSR value to indicate that
545 * frame->mc_vregs contains valid data
546 */
547 msr |= MSR_VEC;
548 }
549
550 /* We always copy to/from vrsave, it's 0 if we don't have or don't
551 * use altivec. Since VSCR only contains 32 bits saved in the least
552 * significant bits of a vector, we "cheat" and stuff VRSAVE in the
553 * most significant bits of that same vector. --BenH
554 */
555 if (cpu_has_feature(CPU_FTR_ALTIVEC))
556 current->thread.ckvrsave = mfspr(SPRN_VRSAVE);
557 if (__put_user(current->thread.ckvrsave,
558 (u32 __user *)&frame->mc_vregs[32]))
559 return 1;
560 if (msr & MSR_VEC) {
561 if (__put_user(current->thread.vrsave,
562 (u32 __user *)&tm_frame->mc_vregs[32]))
563 return 1;
564 } else {
565 if (__put_user(current->thread.ckvrsave,
566 (u32 __user *)&tm_frame->mc_vregs[32]))
567 return 1;
568 }
569#endif /* CONFIG_ALTIVEC */
570
571 if (copy_ckfpr_to_user(&frame->mc_fregs, current))
572 return 1;
573 if (msr & MSR_FP) {
574 if (copy_fpr_to_user(&tm_frame->mc_fregs, current))
575 return 1;
576 } else {
577 if (copy_ckfpr_to_user(&tm_frame->mc_fregs, current))
578 return 1;
579 }
580
581#ifdef CONFIG_VSX
582 /*
583 * Copy VSR 0-31 upper half from thread_struct to local
584 * buffer, then write that to userspace. Also set MSR_VSX in
585 * the saved MSR value to indicate that frame->mc_vregs
586 * contains valid data
587 */
588 if (current->thread.used_vsr) {
589 if (copy_ckvsx_to_user(&frame->mc_vsregs, current))
590 return 1;
591 if (msr & MSR_VSX) {
592 if (copy_vsx_to_user(&tm_frame->mc_vsregs,
593 current))
594 return 1;
595 } else {
596 if (copy_ckvsx_to_user(&tm_frame->mc_vsregs, current))
597 return 1;
598 }
599
600 msr |= MSR_VSX;
601 }
602#endif /* CONFIG_VSX */
603#ifdef CONFIG_SPE
604 /* SPE regs are not checkpointed with TM, so this section is
605 * simply the same as in save_user_regs().
606 */
607 if (current->thread.used_spe) {
608 flush_spe_to_thread(current);
609 if (__copy_to_user(&frame->mc_vregs, current->thread.evr,
610 ELF_NEVRREG * sizeof(u32)))
611 return 1;
612 /* set MSR_SPE in the saved MSR value to indicate that
613 * frame->mc_vregs contains valid data */
614 msr |= MSR_SPE;
615 }
616
617 /* We always copy to/from spefscr */
618 if (__put_user(current->thread.spefscr, (u32 __user *)&frame->mc_vregs + ELF_NEVRREG))
619 return 1;
620#endif /* CONFIG_SPE */
621
622 if (__put_user(msr, &frame->mc_gregs[PT_MSR]))
623 return 1;
624 if (sigret) {
625 /* Set up the sigreturn trampoline: li r0,sigret; sc */
626 if (__put_user(0x38000000UL + sigret, &frame->tramp[0])
627 || __put_user(0x44000002UL, &frame->tramp[1]))
628 return 1;
629 flush_icache_range((unsigned long) &frame->tramp[0],
630 (unsigned long) &frame->tramp[2]);
631 }
632
633 return 0;
634}
635#endif
636
637/*
638 * Restore the current user register values from the user stack,
639 * (except for MSR).
640 */
641static long restore_user_regs(struct pt_regs *regs,
642 struct mcontext __user *sr, int sig)
643{
644 long err;
645 unsigned int save_r2 = 0;
646 unsigned long msr;
647#ifdef CONFIG_VSX
648 int i;
649#endif
650
651 /*
652 * restore general registers but not including MSR or SOFTE. Also
653 * take care of keeping r2 (TLS) intact if not a signal
654 */
655 if (!sig)
656 save_r2 = (unsigned int)regs->gpr[2];
657 err = restore_general_regs(regs, sr);
658 regs->trap = 0;
659 err |= __get_user(msr, &sr->mc_gregs[PT_MSR]);
660 if (!sig)
661 regs->gpr[2] = (unsigned long) save_r2;
662 if (err)
663 return 1;
664
665 /* if doing signal return, restore the previous little-endian mode */
666 if (sig)
667 regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE);
668
669#ifdef CONFIG_ALTIVEC
670 /*
671 * Force the process to reload the altivec registers from
672 * current->thread when it next does altivec instructions
673 */
674 regs->msr &= ~MSR_VEC;
675 if (msr & MSR_VEC) {
676 /* restore altivec registers from the stack */
677 if (__copy_from_user(¤t->thread.vr_state, &sr->mc_vregs,
678 sizeof(sr->mc_vregs)))
679 return 1;
680 current->thread.used_vr = true;
681 } else if (current->thread.used_vr)
682 memset(¤t->thread.vr_state, 0,
683 ELF_NVRREG * sizeof(vector128));
684
685 /* Always get VRSAVE back */
686 if (__get_user(current->thread.vrsave, (u32 __user *)&sr->mc_vregs[32]))
687 return 1;
688 if (cpu_has_feature(CPU_FTR_ALTIVEC))
689 mtspr(SPRN_VRSAVE, current->thread.vrsave);
690#endif /* CONFIG_ALTIVEC */
691 if (copy_fpr_from_user(current, &sr->mc_fregs))
692 return 1;
693
694#ifdef CONFIG_VSX
695 /*
696 * Force the process to reload the VSX registers from
697 * current->thread when it next does VSX instruction.
698 */
699 regs->msr &= ~MSR_VSX;
700 if (msr & MSR_VSX) {
701 /*
702 * Restore altivec registers from the stack to a local
703 * buffer, then write this out to the thread_struct
704 */
705 if (copy_vsx_from_user(current, &sr->mc_vsregs))
706 return 1;
707 current->thread.used_vsr = true;
708 } else if (current->thread.used_vsr)
709 for (i = 0; i < 32 ; i++)
710 current->thread.fp_state.fpr[i][TS_VSRLOWOFFSET] = 0;
711#endif /* CONFIG_VSX */
712 /*
713 * force the process to reload the FP registers from
714 * current->thread when it next does FP instructions
715 */
716 regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1);
717
718#ifdef CONFIG_SPE
719 /* force the process to reload the spe registers from
720 current->thread when it next does spe instructions */
721 regs->msr &= ~MSR_SPE;
722 if (msr & MSR_SPE) {
723 /* restore spe registers from the stack */
724 if (__copy_from_user(current->thread.evr, &sr->mc_vregs,
725 ELF_NEVRREG * sizeof(u32)))
726 return 1;
727 current->thread.used_spe = true;
728 } else if (current->thread.used_spe)
729 memset(current->thread.evr, 0, ELF_NEVRREG * sizeof(u32));
730
731 /* Always get SPEFSCR back */
732 if (__get_user(current->thread.spefscr, (u32 __user *)&sr->mc_vregs + ELF_NEVRREG))
733 return 1;
734#endif /* CONFIG_SPE */
735
736 return 0;
737}
738
739#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
740/*
741 * Restore the current user register values from the user stack, except for
742 * MSR, and recheckpoint the original checkpointed register state for processes
743 * in transactions.
744 */
745static long restore_tm_user_regs(struct pt_regs *regs,
746 struct mcontext __user *sr,
747 struct mcontext __user *tm_sr)
748{
749 long err;
750 unsigned long msr, msr_hi;
751#ifdef CONFIG_VSX
752 int i;
753#endif
754
755 if (tm_suspend_disabled)
756 return 1;
757 /*
758 * restore general registers but not including MSR or SOFTE. Also
759 * take care of keeping r2 (TLS) intact if not a signal.
760 * See comment in signal_64.c:restore_tm_sigcontexts();
761 * TFHAR is restored from the checkpointed NIP; TEXASR and TFIAR
762 * were set by the signal delivery.
763 */
764 err = restore_general_regs(regs, tm_sr);
765 err |= restore_general_regs(¤t->thread.ckpt_regs, sr);
766
767 err |= __get_user(current->thread.tm_tfhar, &sr->mc_gregs[PT_NIP]);
768
769 err |= __get_user(msr, &sr->mc_gregs[PT_MSR]);
770 if (err)
771 return 1;
772
773 /* Restore the previous little-endian mode */
774 regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE);
775
776#ifdef CONFIG_ALTIVEC
777 regs->msr &= ~MSR_VEC;
778 if (msr & MSR_VEC) {
779 /* restore altivec registers from the stack */
780 if (__copy_from_user(¤t->thread.ckvr_state, &sr->mc_vregs,
781 sizeof(sr->mc_vregs)) ||
782 __copy_from_user(¤t->thread.vr_state,
783 &tm_sr->mc_vregs,
784 sizeof(sr->mc_vregs)))
785 return 1;
786 current->thread.used_vr = true;
787 } else if (current->thread.used_vr) {
788 memset(¤t->thread.vr_state, 0,
789 ELF_NVRREG * sizeof(vector128));
790 memset(¤t->thread.ckvr_state, 0,
791 ELF_NVRREG * sizeof(vector128));
792 }
793
794 /* Always get VRSAVE back */
795 if (__get_user(current->thread.ckvrsave,
796 (u32 __user *)&sr->mc_vregs[32]) ||
797 __get_user(current->thread.vrsave,
798 (u32 __user *)&tm_sr->mc_vregs[32]))
799 return 1;
800 if (cpu_has_feature(CPU_FTR_ALTIVEC))
801 mtspr(SPRN_VRSAVE, current->thread.ckvrsave);
802#endif /* CONFIG_ALTIVEC */
803
804 regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1);
805
806 if (copy_fpr_from_user(current, &sr->mc_fregs) ||
807 copy_ckfpr_from_user(current, &tm_sr->mc_fregs))
808 return 1;
809
810#ifdef CONFIG_VSX
811 regs->msr &= ~MSR_VSX;
812 if (msr & MSR_VSX) {
813 /*
814 * Restore altivec registers from the stack to a local
815 * buffer, then write this out to the thread_struct
816 */
817 if (copy_vsx_from_user(current, &tm_sr->mc_vsregs) ||
818 copy_ckvsx_from_user(current, &sr->mc_vsregs))
819 return 1;
820 current->thread.used_vsr = true;
821 } else if (current->thread.used_vsr)
822 for (i = 0; i < 32 ; i++) {
823 current->thread.fp_state.fpr[i][TS_VSRLOWOFFSET] = 0;
824 current->thread.ckfp_state.fpr[i][TS_VSRLOWOFFSET] = 0;
825 }
826#endif /* CONFIG_VSX */
827
828#ifdef CONFIG_SPE
829 /* SPE regs are not checkpointed with TM, so this section is
830 * simply the same as in restore_user_regs().
831 */
832 regs->msr &= ~MSR_SPE;
833 if (msr & MSR_SPE) {
834 if (__copy_from_user(current->thread.evr, &sr->mc_vregs,
835 ELF_NEVRREG * sizeof(u32)))
836 return 1;
837 current->thread.used_spe = true;
838 } else if (current->thread.used_spe)
839 memset(current->thread.evr, 0, ELF_NEVRREG * sizeof(u32));
840
841 /* Always get SPEFSCR back */
842 if (__get_user(current->thread.spefscr, (u32 __user *)&sr->mc_vregs
843 + ELF_NEVRREG))
844 return 1;
845#endif /* CONFIG_SPE */
846
847 /* Get the top half of the MSR from the user context */
848 if (__get_user(msr_hi, &tm_sr->mc_gregs[PT_MSR]))
849 return 1;
850 msr_hi <<= 32;
851 /* If TM bits are set to the reserved value, it's an invalid context */
852 if (MSR_TM_RESV(msr_hi))
853 return 1;
854 /* Pull in the MSR TM bits from the user context */
855 regs->msr = (regs->msr & ~MSR_TS_MASK) | (msr_hi & MSR_TS_MASK);
856 /* Now, recheckpoint. This loads up all of the checkpointed (older)
857 * registers, including FP and V[S]Rs. After recheckpointing, the
858 * transactional versions should be loaded.
859 */
860 tm_enable();
861 /* Make sure the transaction is marked as failed */
862 current->thread.tm_texasr |= TEXASR_FS;
863 /* This loads the checkpointed FP/VEC state, if used */
864 tm_recheckpoint(¤t->thread);
865
866 /* This loads the speculative FP/VEC state, if used */
867 msr_check_and_set(msr & (MSR_FP | MSR_VEC));
868 if (msr & MSR_FP) {
869 load_fp_state(¤t->thread.fp_state);
870 regs->msr |= (MSR_FP | current->thread.fpexc_mode);
871 }
872#ifdef CONFIG_ALTIVEC
873 if (msr & MSR_VEC) {
874 load_vr_state(¤t->thread.vr_state);
875 regs->msr |= MSR_VEC;
876 }
877#endif
878
879 return 0;
880}
881#endif
882
883#ifdef CONFIG_PPC64
884
885#define copy_siginfo_to_user copy_siginfo_to_user32
886
887#endif /* CONFIG_PPC64 */
888
889/*
890 * Set up a signal frame for a "real-time" signal handler
891 * (one which gets siginfo).
892 */
893int handle_rt_signal32(struct ksignal *ksig, sigset_t *oldset,
894 struct task_struct *tsk)
895{
896 struct rt_sigframe __user *rt_sf;
897 struct mcontext __user *frame;
898 struct mcontext __user *tm_frame = NULL;
899 void __user *addr;
900 unsigned long newsp = 0;
901 int sigret;
902 unsigned long tramp;
903 struct pt_regs *regs = tsk->thread.regs;
904
905 BUG_ON(tsk != current);
906
907 /* Set up Signal Frame */
908 /* Put a Real Time Context onto stack */
909 rt_sf = get_sigframe(ksig, get_tm_stackpointer(tsk), sizeof(*rt_sf), 1);
910 addr = rt_sf;
911 if (unlikely(rt_sf == NULL))
912 goto badframe;
913
914 /* Put the siginfo & fill in most of the ucontext */
915 if (copy_siginfo_to_user(&rt_sf->info, &ksig->info)
916 || __put_user(0, &rt_sf->uc.uc_flags)
917 || __save_altstack(&rt_sf->uc.uc_stack, regs->gpr[1])
918 || __put_user(to_user_ptr(&rt_sf->uc.uc_mcontext),
919 &rt_sf->uc.uc_regs)
920 || put_sigset_t(&rt_sf->uc.uc_sigmask, oldset))
921 goto badframe;
922
923 /* Save user registers on the stack */
924 frame = &rt_sf->uc.uc_mcontext;
925 addr = frame;
926 if (vdso32_rt_sigtramp && tsk->mm->context.vdso_base) {
927 sigret = 0;
928 tramp = tsk->mm->context.vdso_base + vdso32_rt_sigtramp;
929 } else {
930 sigret = __NR_rt_sigreturn;
931 tramp = (unsigned long) frame->tramp;
932 }
933
934#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
935 tm_frame = &rt_sf->uc_transact.uc_mcontext;
936 if (MSR_TM_ACTIVE(regs->msr)) {
937 if (__put_user((unsigned long)&rt_sf->uc_transact,
938 &rt_sf->uc.uc_link) ||
939 __put_user((unsigned long)tm_frame,
940 &rt_sf->uc_transact.uc_regs))
941 goto badframe;
942 if (save_tm_user_regs(regs, frame, tm_frame, sigret))
943 goto badframe;
944 }
945 else
946#endif
947 {
948 if (__put_user(0, &rt_sf->uc.uc_link))
949 goto badframe;
950 if (save_user_regs(regs, frame, tm_frame, sigret, 1))
951 goto badframe;
952 }
953 regs->link = tramp;
954
955 tsk->thread.fp_state.fpscr = 0; /* turn off all fp exceptions */
956
957 /* create a stack frame for the caller of the handler */
958 newsp = ((unsigned long)rt_sf) - (__SIGNAL_FRAMESIZE + 16);
959 addr = (void __user *)regs->gpr[1];
960 if (put_user(regs->gpr[1], (u32 __user *)newsp))
961 goto badframe;
962
963 /* Fill registers for signal handler */
964 regs->gpr[1] = newsp;
965 regs->gpr[3] = ksig->sig;
966 regs->gpr[4] = (unsigned long) &rt_sf->info;
967 regs->gpr[5] = (unsigned long) &rt_sf->uc;
968 regs->gpr[6] = (unsigned long) rt_sf;
969 regs->nip = (unsigned long) ksig->ka.sa.sa_handler;
970 /* enter the signal handler in native-endian mode */
971 regs->msr &= ~MSR_LE;
972 regs->msr |= (MSR_KERNEL & MSR_LE);
973 return 0;
974
975badframe:
976 if (show_unhandled_signals)
977 printk_ratelimited(KERN_INFO
978 "%s[%d]: bad frame in handle_rt_signal32: "
979 "%p nip %08lx lr %08lx\n",
980 tsk->comm, tsk->pid,
981 addr, regs->nip, regs->link);
982
983 return 1;
984}
985
986static int do_setcontext(struct ucontext __user *ucp, struct pt_regs *regs, int sig)
987{
988 sigset_t set;
989 struct mcontext __user *mcp;
990
991 if (get_sigset_t(&set, &ucp->uc_sigmask))
992 return -EFAULT;
993#ifdef CONFIG_PPC64
994 {
995 u32 cmcp;
996
997 if (__get_user(cmcp, &ucp->uc_regs))
998 return -EFAULT;
999 mcp = (struct mcontext __user *)(u64)cmcp;
1000 /* no need to check access_ok(mcp), since mcp < 4GB */
1001 }
1002#else
1003 if (__get_user(mcp, &ucp->uc_regs))
1004 return -EFAULT;
1005 if (!access_ok(VERIFY_READ, mcp, sizeof(*mcp)))
1006 return -EFAULT;
1007#endif
1008 set_current_blocked(&set);
1009 if (restore_user_regs(regs, mcp, sig))
1010 return -EFAULT;
1011
1012 return 0;
1013}
1014
1015#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1016static int do_setcontext_tm(struct ucontext __user *ucp,
1017 struct ucontext __user *tm_ucp,
1018 struct pt_regs *regs)
1019{
1020 sigset_t set;
1021 struct mcontext __user *mcp;
1022 struct mcontext __user *tm_mcp;
1023 u32 cmcp;
1024 u32 tm_cmcp;
1025
1026 if (get_sigset_t(&set, &ucp->uc_sigmask))
1027 return -EFAULT;
1028
1029 if (__get_user(cmcp, &ucp->uc_regs) ||
1030 __get_user(tm_cmcp, &tm_ucp->uc_regs))
1031 return -EFAULT;
1032 mcp = (struct mcontext __user *)(u64)cmcp;
1033 tm_mcp = (struct mcontext __user *)(u64)tm_cmcp;
1034 /* no need to check access_ok(mcp), since mcp < 4GB */
1035
1036 set_current_blocked(&set);
1037 if (restore_tm_user_regs(regs, mcp, tm_mcp))
1038 return -EFAULT;
1039
1040 return 0;
1041}
1042#endif
1043
1044long sys_swapcontext(struct ucontext __user *old_ctx,
1045 struct ucontext __user *new_ctx,
1046 int ctx_size, int r6, int r7, int r8, struct pt_regs *regs)
1047{
1048 unsigned char tmp __maybe_unused;
1049 int ctx_has_vsx_region = 0;
1050
1051#ifdef CONFIG_PPC64
1052 unsigned long new_msr = 0;
1053
1054 if (new_ctx) {
1055 struct mcontext __user *mcp;
1056 u32 cmcp;
1057
1058 /*
1059 * Get pointer to the real mcontext. No need for
1060 * access_ok since we are dealing with compat
1061 * pointers.
1062 */
1063 if (__get_user(cmcp, &new_ctx->uc_regs))
1064 return -EFAULT;
1065 mcp = (struct mcontext __user *)(u64)cmcp;
1066 if (__get_user(new_msr, &mcp->mc_gregs[PT_MSR]))
1067 return -EFAULT;
1068 }
1069 /*
1070 * Check that the context is not smaller than the original
1071 * size (with VMX but without VSX)
1072 */
1073 if (ctx_size < UCONTEXTSIZEWITHOUTVSX)
1074 return -EINVAL;
1075 /*
1076 * If the new context state sets the MSR VSX bits but
1077 * it doesn't provide VSX state.
1078 */
1079 if ((ctx_size < sizeof(struct ucontext)) &&
1080 (new_msr & MSR_VSX))
1081 return -EINVAL;
1082 /* Does the context have enough room to store VSX data? */
1083 if (ctx_size >= sizeof(struct ucontext))
1084 ctx_has_vsx_region = 1;
1085#else
1086 /* Context size is for future use. Right now, we only make sure
1087 * we are passed something we understand
1088 */
1089 if (ctx_size < sizeof(struct ucontext))
1090 return -EINVAL;
1091#endif
1092 if (old_ctx != NULL) {
1093 struct mcontext __user *mctx;
1094
1095 /*
1096 * old_ctx might not be 16-byte aligned, in which
1097 * case old_ctx->uc_mcontext won't be either.
1098 * Because we have the old_ctx->uc_pad2 field
1099 * before old_ctx->uc_mcontext, we need to round down
1100 * from &old_ctx->uc_mcontext to a 16-byte boundary.
1101 */
1102 mctx = (struct mcontext __user *)
1103 ((unsigned long) &old_ctx->uc_mcontext & ~0xfUL);
1104 if (!access_ok(VERIFY_WRITE, old_ctx, ctx_size)
1105 || save_user_regs(regs, mctx, NULL, 0, ctx_has_vsx_region)
1106 || put_sigset_t(&old_ctx->uc_sigmask, ¤t->blocked)
1107 || __put_user(to_user_ptr(mctx), &old_ctx->uc_regs))
1108 return -EFAULT;
1109 }
1110 if (new_ctx == NULL)
1111 return 0;
1112 if (!access_ok(VERIFY_READ, new_ctx, ctx_size)
1113 || __get_user(tmp, (u8 __user *) new_ctx)
1114 || __get_user(tmp, (u8 __user *) new_ctx + ctx_size - 1))
1115 return -EFAULT;
1116
1117 /*
1118 * If we get a fault copying the context into the kernel's
1119 * image of the user's registers, we can't just return -EFAULT
1120 * because the user's registers will be corrupted. For instance
1121 * the NIP value may have been updated but not some of the
1122 * other registers. Given that we have done the access_ok
1123 * and successfully read the first and last bytes of the region
1124 * above, this should only happen in an out-of-memory situation
1125 * or if another thread unmaps the region containing the context.
1126 * We kill the task with a SIGSEGV in this situation.
1127 */
1128 if (do_setcontext(new_ctx, regs, 0))
1129 do_exit(SIGSEGV);
1130
1131 set_thread_flag(TIF_RESTOREALL);
1132 return 0;
1133}
1134
1135long sys_rt_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8,
1136 struct pt_regs *regs)
1137{
1138 struct rt_sigframe __user *rt_sf;
1139#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1140 struct ucontext __user *uc_transact;
1141 unsigned long msr_hi;
1142 unsigned long tmp;
1143 int tm_restore = 0;
1144#endif
1145 /* Always make any pending restarted system calls return -EINTR */
1146 current->restart_block.fn = do_no_restart_syscall;
1147
1148 rt_sf = (struct rt_sigframe __user *)
1149 (regs->gpr[1] + __SIGNAL_FRAMESIZE + 16);
1150 if (!access_ok(VERIFY_READ, rt_sf, sizeof(*rt_sf)))
1151 goto bad;
1152
1153#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1154 /*
1155 * If there is a transactional state then throw it away.
1156 * The purpose of a sigreturn is to destroy all traces of the
1157 * signal frame, this includes any transactional state created
1158 * within in. We only check for suspended as we can never be
1159 * active in the kernel, we are active, there is nothing better to
1160 * do than go ahead and Bad Thing later.
1161 * The cause is not important as there will never be a
1162 * recheckpoint so it's not user visible.
1163 */
1164 if (MSR_TM_SUSPENDED(mfmsr()))
1165 tm_reclaim_current(0);
1166
1167 if (__get_user(tmp, &rt_sf->uc.uc_link))
1168 goto bad;
1169 uc_transact = (struct ucontext __user *)(uintptr_t)tmp;
1170 if (uc_transact) {
1171 u32 cmcp;
1172 struct mcontext __user *mcp;
1173
1174 if (__get_user(cmcp, &uc_transact->uc_regs))
1175 return -EFAULT;
1176 mcp = (struct mcontext __user *)(u64)cmcp;
1177 /* The top 32 bits of the MSR are stashed in the transactional
1178 * ucontext. */
1179 if (__get_user(msr_hi, &mcp->mc_gregs[PT_MSR]))
1180 goto bad;
1181
1182 if (MSR_TM_ACTIVE(msr_hi<<32)) {
1183 /* We only recheckpoint on return if we're
1184 * transaction.
1185 */
1186 tm_restore = 1;
1187 if (do_setcontext_tm(&rt_sf->uc, uc_transact, regs))
1188 goto bad;
1189 }
1190 }
1191 if (!tm_restore)
1192 /* Fall through, for non-TM restore */
1193#endif
1194 if (do_setcontext(&rt_sf->uc, regs, 1))
1195 goto bad;
1196
1197 /*
1198 * It's not clear whether or why it is desirable to save the
1199 * sigaltstack setting on signal delivery and restore it on
1200 * signal return. But other architectures do this and we have
1201 * always done it up until now so it is probably better not to
1202 * change it. -- paulus
1203 */
1204#ifdef CONFIG_PPC64
1205 if (compat_restore_altstack(&rt_sf->uc.uc_stack))
1206 goto bad;
1207#else
1208 if (restore_altstack(&rt_sf->uc.uc_stack))
1209 goto bad;
1210#endif
1211 set_thread_flag(TIF_RESTOREALL);
1212 return 0;
1213
1214 bad:
1215 if (show_unhandled_signals)
1216 printk_ratelimited(KERN_INFO
1217 "%s[%d]: bad frame in sys_rt_sigreturn: "
1218 "%p nip %08lx lr %08lx\n",
1219 current->comm, current->pid,
1220 rt_sf, regs->nip, regs->link);
1221
1222 force_sig(SIGSEGV, current);
1223 return 0;
1224}
1225
1226#ifdef CONFIG_PPC32
1227int sys_debug_setcontext(struct ucontext __user *ctx,
1228 int ndbg, struct sig_dbg_op __user *dbg,
1229 int r6, int r7, int r8,
1230 struct pt_regs *regs)
1231{
1232 struct sig_dbg_op op;
1233 int i;
1234 unsigned char tmp __maybe_unused;
1235 unsigned long new_msr = regs->msr;
1236#ifdef CONFIG_PPC_ADV_DEBUG_REGS
1237 unsigned long new_dbcr0 = current->thread.debug.dbcr0;
1238#endif
1239
1240 for (i=0; i<ndbg; i++) {
1241 if (copy_from_user(&op, dbg + i, sizeof(op)))
1242 return -EFAULT;
1243 switch (op.dbg_type) {
1244 case SIG_DBG_SINGLE_STEPPING:
1245#ifdef CONFIG_PPC_ADV_DEBUG_REGS
1246 if (op.dbg_value) {
1247 new_msr |= MSR_DE;
1248 new_dbcr0 |= (DBCR0_IDM | DBCR0_IC);
1249 } else {
1250 new_dbcr0 &= ~DBCR0_IC;
1251 if (!DBCR_ACTIVE_EVENTS(new_dbcr0,
1252 current->thread.debug.dbcr1)) {
1253 new_msr &= ~MSR_DE;
1254 new_dbcr0 &= ~DBCR0_IDM;
1255 }
1256 }
1257#else
1258 if (op.dbg_value)
1259 new_msr |= MSR_SE;
1260 else
1261 new_msr &= ~MSR_SE;
1262#endif
1263 break;
1264 case SIG_DBG_BRANCH_TRACING:
1265#ifdef CONFIG_PPC_ADV_DEBUG_REGS
1266 return -EINVAL;
1267#else
1268 if (op.dbg_value)
1269 new_msr |= MSR_BE;
1270 else
1271 new_msr &= ~MSR_BE;
1272#endif
1273 break;
1274
1275 default:
1276 return -EINVAL;
1277 }
1278 }
1279
1280 /* We wait until here to actually install the values in the
1281 registers so if we fail in the above loop, it will not
1282 affect the contents of these registers. After this point,
1283 failure is a problem, anyway, and it's very unlikely unless
1284 the user is really doing something wrong. */
1285 regs->msr = new_msr;
1286#ifdef CONFIG_PPC_ADV_DEBUG_REGS
1287 current->thread.debug.dbcr0 = new_dbcr0;
1288#endif
1289
1290 if (!access_ok(VERIFY_READ, ctx, sizeof(*ctx))
1291 || __get_user(tmp, (u8 __user *) ctx)
1292 || __get_user(tmp, (u8 __user *) (ctx + 1) - 1))
1293 return -EFAULT;
1294
1295 /*
1296 * If we get a fault copying the context into the kernel's
1297 * image of the user's registers, we can't just return -EFAULT
1298 * because the user's registers will be corrupted. For instance
1299 * the NIP value may have been updated but not some of the
1300 * other registers. Given that we have done the access_ok
1301 * and successfully read the first and last bytes of the region
1302 * above, this should only happen in an out-of-memory situation
1303 * or if another thread unmaps the region containing the context.
1304 * We kill the task with a SIGSEGV in this situation.
1305 */
1306 if (do_setcontext(ctx, regs, 1)) {
1307 if (show_unhandled_signals)
1308 printk_ratelimited(KERN_INFO "%s[%d]: bad frame in "
1309 "sys_debug_setcontext: %p nip %08lx "
1310 "lr %08lx\n",
1311 current->comm, current->pid,
1312 ctx, regs->nip, regs->link);
1313
1314 force_sig(SIGSEGV, current);
1315 goto out;
1316 }
1317
1318 /*
1319 * It's not clear whether or why it is desirable to save the
1320 * sigaltstack setting on signal delivery and restore it on
1321 * signal return. But other architectures do this and we have
1322 * always done it up until now so it is probably better not to
1323 * change it. -- paulus
1324 */
1325 restore_altstack(&ctx->uc_stack);
1326
1327 set_thread_flag(TIF_RESTOREALL);
1328 out:
1329 return 0;
1330}
1331#endif
1332
1333/*
1334 * OK, we're invoking a handler
1335 */
1336int handle_signal32(struct ksignal *ksig, sigset_t *oldset,
1337 struct task_struct *tsk)
1338{
1339 struct sigcontext __user *sc;
1340 struct sigframe __user *frame;
1341 struct mcontext __user *tm_mctx = NULL;
1342 unsigned long newsp = 0;
1343 int sigret;
1344 unsigned long tramp;
1345 struct pt_regs *regs = tsk->thread.regs;
1346
1347 BUG_ON(tsk != current);
1348
1349 /* Set up Signal Frame */
1350 frame = get_sigframe(ksig, get_tm_stackpointer(tsk), sizeof(*frame), 1);
1351 if (unlikely(frame == NULL))
1352 goto badframe;
1353 sc = (struct sigcontext __user *) &frame->sctx;
1354
1355#if _NSIG != 64
1356#error "Please adjust handle_signal()"
1357#endif
1358 if (__put_user(to_user_ptr(ksig->ka.sa.sa_handler), &sc->handler)
1359 || __put_user(oldset->sig[0], &sc->oldmask)
1360#ifdef CONFIG_PPC64
1361 || __put_user((oldset->sig[0] >> 32), &sc->_unused[3])
1362#else
1363 || __put_user(oldset->sig[1], &sc->_unused[3])
1364#endif
1365 || __put_user(to_user_ptr(&frame->mctx), &sc->regs)
1366 || __put_user(ksig->sig, &sc->signal))
1367 goto badframe;
1368
1369 if (vdso32_sigtramp && tsk->mm->context.vdso_base) {
1370 sigret = 0;
1371 tramp = tsk->mm->context.vdso_base + vdso32_sigtramp;
1372 } else {
1373 sigret = __NR_sigreturn;
1374 tramp = (unsigned long) frame->mctx.tramp;
1375 }
1376
1377#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1378 tm_mctx = &frame->mctx_transact;
1379 if (MSR_TM_ACTIVE(regs->msr)) {
1380 if (save_tm_user_regs(regs, &frame->mctx, &frame->mctx_transact,
1381 sigret))
1382 goto badframe;
1383 }
1384 else
1385#endif
1386 {
1387 if (save_user_regs(regs, &frame->mctx, tm_mctx, sigret, 1))
1388 goto badframe;
1389 }
1390
1391 regs->link = tramp;
1392
1393 tsk->thread.fp_state.fpscr = 0; /* turn off all fp exceptions */
1394
1395 /* create a stack frame for the caller of the handler */
1396 newsp = ((unsigned long)frame) - __SIGNAL_FRAMESIZE;
1397 if (put_user(regs->gpr[1], (u32 __user *)newsp))
1398 goto badframe;
1399
1400 regs->gpr[1] = newsp;
1401 regs->gpr[3] = ksig->sig;
1402 regs->gpr[4] = (unsigned long) sc;
1403 regs->nip = (unsigned long) (unsigned long)ksig->ka.sa.sa_handler;
1404 /* enter the signal handler in big-endian mode */
1405 regs->msr &= ~MSR_LE;
1406 return 0;
1407
1408badframe:
1409 if (show_unhandled_signals)
1410 printk_ratelimited(KERN_INFO
1411 "%s[%d]: bad frame in handle_signal32: "
1412 "%p nip %08lx lr %08lx\n",
1413 tsk->comm, tsk->pid,
1414 frame, regs->nip, regs->link);
1415
1416 return 1;
1417}
1418
1419/*
1420 * Do a signal return; undo the signal stack.
1421 */
1422long sys_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8,
1423 struct pt_regs *regs)
1424{
1425 struct sigframe __user *sf;
1426 struct sigcontext __user *sc;
1427 struct sigcontext sigctx;
1428 struct mcontext __user *sr;
1429 void __user *addr;
1430 sigset_t set;
1431#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1432 struct mcontext __user *mcp, *tm_mcp;
1433 unsigned long msr_hi;
1434#endif
1435
1436 /* Always make any pending restarted system calls return -EINTR */
1437 current->restart_block.fn = do_no_restart_syscall;
1438
1439 sf = (struct sigframe __user *)(regs->gpr[1] + __SIGNAL_FRAMESIZE);
1440 sc = &sf->sctx;
1441 addr = sc;
1442 if (copy_from_user(&sigctx, sc, sizeof(sigctx)))
1443 goto badframe;
1444
1445#ifdef CONFIG_PPC64
1446 /*
1447 * Note that PPC32 puts the upper 32 bits of the sigmask in the
1448 * unused part of the signal stackframe
1449 */
1450 set.sig[0] = sigctx.oldmask + ((long)(sigctx._unused[3]) << 32);
1451#else
1452 set.sig[0] = sigctx.oldmask;
1453 set.sig[1] = sigctx._unused[3];
1454#endif
1455 set_current_blocked(&set);
1456
1457#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1458 mcp = (struct mcontext __user *)&sf->mctx;
1459 tm_mcp = (struct mcontext __user *)&sf->mctx_transact;
1460 if (__get_user(msr_hi, &tm_mcp->mc_gregs[PT_MSR]))
1461 goto badframe;
1462 if (MSR_TM_ACTIVE(msr_hi<<32)) {
1463 if (!cpu_has_feature(CPU_FTR_TM))
1464 goto badframe;
1465 if (restore_tm_user_regs(regs, mcp, tm_mcp))
1466 goto badframe;
1467 } else
1468#endif
1469 {
1470 sr = (struct mcontext __user *)from_user_ptr(sigctx.regs);
1471 addr = sr;
1472 if (!access_ok(VERIFY_READ, sr, sizeof(*sr))
1473 || restore_user_regs(regs, sr, 1))
1474 goto badframe;
1475 }
1476
1477 set_thread_flag(TIF_RESTOREALL);
1478 return 0;
1479
1480badframe:
1481 if (show_unhandled_signals)
1482 printk_ratelimited(KERN_INFO
1483 "%s[%d]: bad frame in sys_sigreturn: "
1484 "%p nip %08lx lr %08lx\n",
1485 current->comm, current->pid,
1486 addr, regs->nip, regs->link);
1487
1488 force_sig(SIGSEGV, current);
1489 return 0;
1490}