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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 compat_sigset_t cset;
98
99 switch (_NSIG_WORDS) {
100 case 4: cset.sig[6] = set->sig[3] & 0xffffffffull;
101 cset.sig[7] = set->sig[3] >> 32;
102 case 3: cset.sig[4] = set->sig[2] & 0xffffffffull;
103 cset.sig[5] = set->sig[2] >> 32;
104 case 2: cset.sig[2] = set->sig[1] & 0xffffffffull;
105 cset.sig[3] = set->sig[1] >> 32;
106 case 1: cset.sig[0] = set->sig[0] & 0xffffffffull;
107 cset.sig[1] = set->sig[0] >> 32;
108 }
109 return copy_to_user(uset, &cset, sizeof(*uset));
110}
111
112static inline int get_sigset_t(sigset_t *set,
113 const compat_sigset_t __user *uset)
114{
115 compat_sigset_t s32;
116
117 if (copy_from_user(&s32, uset, sizeof(*uset)))
118 return -EFAULT;
119
120 /*
121 * Swap the 2 words of the 64-bit sigset_t (they are stored
122 * in the "wrong" endian in 32-bit user storage).
123 */
124 switch (_NSIG_WORDS) {
125 case 4: set->sig[3] = s32.sig[6] | (((long)s32.sig[7]) << 32);
126 case 3: set->sig[2] = s32.sig[4] | (((long)s32.sig[5]) << 32);
127 case 2: set->sig[1] = s32.sig[2] | (((long)s32.sig[3]) << 32);
128 case 1: set->sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32);
129 }
130 return 0;
131}
132
133#define to_user_ptr(p) ptr_to_compat(p)
134#define from_user_ptr(p) compat_ptr(p)
135
136static inline int save_general_regs(struct pt_regs *regs,
137 struct mcontext __user *frame)
138{
139 elf_greg_t64 *gregs = (elf_greg_t64 *)regs;
140 int i;
141
142 WARN_ON(!FULL_REGS(regs));
143
144 for (i = 0; i <= PT_RESULT; i ++) {
145 if (i == 14 && !FULL_REGS(regs))
146 i = 32;
147 if (__put_user((unsigned int)gregs[i], &frame->mc_gregs[i]))
148 return -EFAULT;
149 }
150 return 0;
151}
152
153static inline int restore_general_regs(struct pt_regs *regs,
154 struct mcontext __user *sr)
155{
156 elf_greg_t64 *gregs = (elf_greg_t64 *)regs;
157 int i;
158
159 for (i = 0; i <= PT_RESULT; i++) {
160 if ((i == PT_MSR) || (i == PT_SOFTE))
161 continue;
162 if (__get_user(gregs[i], &sr->mc_gregs[i]))
163 return -EFAULT;
164 }
165 return 0;
166}
167
168#else /* CONFIG_PPC64 */
169
170#define GP_REGS_SIZE min(sizeof(elf_gregset_t), sizeof(struct pt_regs))
171
172static inline int put_sigset_t(sigset_t __user *uset, sigset_t *set)
173{
174 return copy_to_user(uset, set, sizeof(*uset));
175}
176
177static inline int get_sigset_t(sigset_t *set, const sigset_t __user *uset)
178{
179 return copy_from_user(set, uset, sizeof(*uset));
180}
181
182#define to_user_ptr(p) ((unsigned long)(p))
183#define from_user_ptr(p) ((void __user *)(p))
184
185static inline int save_general_regs(struct pt_regs *regs,
186 struct mcontext __user *frame)
187{
188 WARN_ON(!FULL_REGS(regs));
189 return __copy_to_user(&frame->mc_gregs, regs, GP_REGS_SIZE);
190}
191
192static inline int restore_general_regs(struct pt_regs *regs,
193 struct mcontext __user *sr)
194{
195 /* copy up to but not including MSR */
196 if (__copy_from_user(regs, &sr->mc_gregs,
197 PT_MSR * sizeof(elf_greg_t)))
198 return -EFAULT;
199 /* copy from orig_r3 (the word after the MSR) up to the end */
200 if (__copy_from_user(®s->orig_gpr3, &sr->mc_gregs[PT_ORIG_R3],
201 GP_REGS_SIZE - PT_ORIG_R3 * sizeof(elf_greg_t)))
202 return -EFAULT;
203 return 0;
204}
205#endif
206
207/*
208 * When we have signals to deliver, we set up on the
209 * user stack, going down from the original stack pointer:
210 * an ABI gap of 56 words
211 * an mcontext struct
212 * a sigcontext struct
213 * a gap of __SIGNAL_FRAMESIZE bytes
214 *
215 * Each of these things must be a multiple of 16 bytes in size. The following
216 * structure represent all of this except the __SIGNAL_FRAMESIZE gap
217 *
218 */
219struct sigframe {
220 struct sigcontext sctx; /* the sigcontext */
221 struct mcontext mctx; /* all the register values */
222#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
223 struct sigcontext sctx_transact;
224 struct mcontext mctx_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/* We use the mc_pad field for the signal return trampoline. */
234#define tramp mc_pad
235
236/*
237 * When we have rt signals to deliver, we set up on the
238 * user stack, going down from the original stack pointer:
239 * one rt_sigframe struct (siginfo + ucontext + ABI gap)
240 * a gap of __SIGNAL_FRAMESIZE+16 bytes
241 * (the +16 is to get the siginfo and ucontext in the same
242 * positions as in older kernels).
243 *
244 * Each of these things must be a multiple of 16 bytes in size.
245 *
246 */
247struct rt_sigframe {
248#ifdef CONFIG_PPC64
249 compat_siginfo_t info;
250#else
251 struct siginfo info;
252#endif
253 struct ucontext uc;
254#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
255 struct ucontext uc_transact;
256#endif
257 /*
258 * Programs using the rs6000/xcoff abi can save up to 19 gp
259 * regs and 18 fp regs below sp before decrementing it.
260 */
261 int abigap[56];
262};
263
264#ifdef CONFIG_VSX
265unsigned long copy_fpr_to_user(void __user *to,
266 struct task_struct *task)
267{
268 u64 buf[ELF_NFPREG];
269 int i;
270
271 /* save FPR copy to local buffer then write to the thread_struct */
272 for (i = 0; i < (ELF_NFPREG - 1) ; i++)
273 buf[i] = task->thread.TS_FPR(i);
274 buf[i] = task->thread.fp_state.fpscr;
275 return __copy_to_user(to, buf, ELF_NFPREG * sizeof(double));
276}
277
278unsigned long copy_fpr_from_user(struct task_struct *task,
279 void __user *from)
280{
281 u64 buf[ELF_NFPREG];
282 int i;
283
284 if (__copy_from_user(buf, from, ELF_NFPREG * sizeof(double)))
285 return 1;
286 for (i = 0; i < (ELF_NFPREG - 1) ; i++)
287 task->thread.TS_FPR(i) = buf[i];
288 task->thread.fp_state.fpscr = buf[i];
289
290 return 0;
291}
292
293unsigned long copy_vsx_to_user(void __user *to,
294 struct task_struct *task)
295{
296 u64 buf[ELF_NVSRHALFREG];
297 int i;
298
299 /* save FPR copy to local buffer then write to the thread_struct */
300 for (i = 0; i < ELF_NVSRHALFREG; i++)
301 buf[i] = task->thread.fp_state.fpr[i][TS_VSRLOWOFFSET];
302 return __copy_to_user(to, buf, ELF_NVSRHALFREG * sizeof(double));
303}
304
305unsigned long copy_vsx_from_user(struct task_struct *task,
306 void __user *from)
307{
308 u64 buf[ELF_NVSRHALFREG];
309 int i;
310
311 if (__copy_from_user(buf, from, ELF_NVSRHALFREG * sizeof(double)))
312 return 1;
313 for (i = 0; i < ELF_NVSRHALFREG ; i++)
314 task->thread.fp_state.fpr[i][TS_VSRLOWOFFSET] = buf[i];
315 return 0;
316}
317
318#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
319unsigned long copy_ckfpr_to_user(void __user *to,
320 struct task_struct *task)
321{
322 u64 buf[ELF_NFPREG];
323 int i;
324
325 /* save FPR copy to local buffer then write to the thread_struct */
326 for (i = 0; i < (ELF_NFPREG - 1) ; i++)
327 buf[i] = task->thread.TS_CKFPR(i);
328 buf[i] = task->thread.ckfp_state.fpscr;
329 return __copy_to_user(to, buf, ELF_NFPREG * sizeof(double));
330}
331
332unsigned long copy_ckfpr_from_user(struct task_struct *task,
333 void __user *from)
334{
335 u64 buf[ELF_NFPREG];
336 int i;
337
338 if (__copy_from_user(buf, from, ELF_NFPREG * sizeof(double)))
339 return 1;
340 for (i = 0; i < (ELF_NFPREG - 1) ; i++)
341 task->thread.TS_CKFPR(i) = buf[i];
342 task->thread.ckfp_state.fpscr = buf[i];
343
344 return 0;
345}
346
347unsigned long copy_ckvsx_to_user(void __user *to,
348 struct task_struct *task)
349{
350 u64 buf[ELF_NVSRHALFREG];
351 int i;
352
353 /* save FPR copy to local buffer then write to the thread_struct */
354 for (i = 0; i < ELF_NVSRHALFREG; i++)
355 buf[i] = task->thread.ckfp_state.fpr[i][TS_VSRLOWOFFSET];
356 return __copy_to_user(to, buf, ELF_NVSRHALFREG * sizeof(double));
357}
358
359unsigned long copy_ckvsx_from_user(struct task_struct *task,
360 void __user *from)
361{
362 u64 buf[ELF_NVSRHALFREG];
363 int i;
364
365 if (__copy_from_user(buf, from, ELF_NVSRHALFREG * sizeof(double)))
366 return 1;
367 for (i = 0; i < ELF_NVSRHALFREG ; i++)
368 task->thread.ckfp_state.fpr[i][TS_VSRLOWOFFSET] = buf[i];
369 return 0;
370}
371#endif /* CONFIG_PPC_TRANSACTIONAL_MEM */
372#else
373inline unsigned long copy_fpr_to_user(void __user *to,
374 struct task_struct *task)
375{
376 return __copy_to_user(to, task->thread.fp_state.fpr,
377 ELF_NFPREG * sizeof(double));
378}
379
380inline unsigned long copy_fpr_from_user(struct task_struct *task,
381 void __user *from)
382{
383 return __copy_from_user(task->thread.fp_state.fpr, from,
384 ELF_NFPREG * sizeof(double));
385}
386
387#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
388inline unsigned long copy_ckfpr_to_user(void __user *to,
389 struct task_struct *task)
390{
391 return __copy_to_user(to, task->thread.ckfp_state.fpr,
392 ELF_NFPREG * sizeof(double));
393}
394
395inline unsigned long copy_ckfpr_from_user(struct task_struct *task,
396 void __user *from)
397{
398 return __copy_from_user(task->thread.ckfp_state.fpr, from,
399 ELF_NFPREG * sizeof(double));
400}
401#endif /* CONFIG_PPC_TRANSACTIONAL_MEM */
402#endif
403
404/*
405 * Save the current user registers on the user stack.
406 * We only save the altivec/spe registers if the process has used
407 * altivec/spe instructions at some point.
408 */
409static int save_user_regs(struct pt_regs *regs, struct mcontext __user *frame,
410 struct mcontext __user *tm_frame, int sigret,
411 int ctx_has_vsx_region)
412{
413 unsigned long msr = regs->msr;
414
415 /* Make sure floating point registers are stored in regs */
416 flush_fp_to_thread(current);
417
418 /* save general registers */
419 if (save_general_regs(regs, frame))
420 return 1;
421
422#ifdef CONFIG_ALTIVEC
423 /* save altivec registers */
424 if (current->thread.used_vr) {
425 flush_altivec_to_thread(current);
426 if (__copy_to_user(&frame->mc_vregs, ¤t->thread.vr_state,
427 ELF_NVRREG * sizeof(vector128)))
428 return 1;
429 /* set MSR_VEC in the saved MSR value to indicate that
430 frame->mc_vregs contains valid data */
431 msr |= MSR_VEC;
432 }
433 /* else assert((regs->msr & MSR_VEC) == 0) */
434
435 /* We always copy to/from vrsave, it's 0 if we don't have or don't
436 * use altivec. Since VSCR only contains 32 bits saved in the least
437 * significant bits of a vector, we "cheat" and stuff VRSAVE in the
438 * most significant bits of that same vector. --BenH
439 * Note that the current VRSAVE value is in the SPR at this point.
440 */
441 if (cpu_has_feature(CPU_FTR_ALTIVEC))
442 current->thread.vrsave = mfspr(SPRN_VRSAVE);
443 if (__put_user(current->thread.vrsave, (u32 __user *)&frame->mc_vregs[32]))
444 return 1;
445#endif /* CONFIG_ALTIVEC */
446 if (copy_fpr_to_user(&frame->mc_fregs, current))
447 return 1;
448
449 /*
450 * Clear the MSR VSX bit to indicate there is no valid state attached
451 * to this context, except in the specific case below where we set it.
452 */
453 msr &= ~MSR_VSX;
454#ifdef CONFIG_VSX
455 /*
456 * Copy VSR 0-31 upper half from thread_struct to local
457 * buffer, then write that to userspace. Also set MSR_VSX in
458 * the saved MSR value to indicate that frame->mc_vregs
459 * contains valid data
460 */
461 if (current->thread.used_vsr && ctx_has_vsx_region) {
462 flush_vsx_to_thread(current);
463 if (copy_vsx_to_user(&frame->mc_vsregs, current))
464 return 1;
465 msr |= MSR_VSX;
466 }
467#endif /* CONFIG_VSX */
468#ifdef CONFIG_SPE
469 /* save spe registers */
470 if (current->thread.used_spe) {
471 flush_spe_to_thread(current);
472 if (__copy_to_user(&frame->mc_vregs, current->thread.evr,
473 ELF_NEVRREG * sizeof(u32)))
474 return 1;
475 /* set MSR_SPE in the saved MSR value to indicate that
476 frame->mc_vregs contains valid data */
477 msr |= MSR_SPE;
478 }
479 /* else assert((regs->msr & MSR_SPE) == 0) */
480
481 /* We always copy to/from spefscr */
482 if (__put_user(current->thread.spefscr, (u32 __user *)&frame->mc_vregs + ELF_NEVRREG))
483 return 1;
484#endif /* CONFIG_SPE */
485
486 if (__put_user(msr, &frame->mc_gregs[PT_MSR]))
487 return 1;
488 /* We need to write 0 the MSR top 32 bits in the tm frame so that we
489 * can check it on the restore to see if TM is active
490 */
491 if (tm_frame && __put_user(0, &tm_frame->mc_gregs[PT_MSR]))
492 return 1;
493
494 if (sigret) {
495 /* Set up the sigreturn trampoline: li r0,sigret; sc */
496 if (__put_user(0x38000000UL + sigret, &frame->tramp[0])
497 || __put_user(0x44000002UL, &frame->tramp[1]))
498 return 1;
499 flush_icache_range((unsigned long) &frame->tramp[0],
500 (unsigned long) &frame->tramp[2]);
501 }
502
503 return 0;
504}
505
506#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
507/*
508 * Save the current user registers on the user stack.
509 * We only save the altivec/spe registers if the process has used
510 * altivec/spe instructions at some point.
511 * We also save the transactional registers to a second ucontext in the
512 * frame.
513 *
514 * See save_user_regs() and signal_64.c:setup_tm_sigcontexts().
515 */
516static int save_tm_user_regs(struct pt_regs *regs,
517 struct mcontext __user *frame,
518 struct mcontext __user *tm_frame, int sigret)
519{
520 unsigned long msr = regs->msr;
521
522 /* Remove TM bits from thread's MSR. The MSR in the sigcontext
523 * just indicates to userland that we were doing a transaction, but we
524 * don't want to return in transactional state. This also ensures
525 * that flush_fp_to_thread won't set TIF_RESTORE_TM again.
526 */
527 regs->msr &= ~MSR_TS_MASK;
528
529 /* Save both sets of general registers */
530 if (save_general_regs(¤t->thread.ckpt_regs, frame)
531 || save_general_regs(regs, tm_frame))
532 return 1;
533
534 /* Stash the top half of the 64bit MSR into the 32bit MSR word
535 * of the transactional mcontext. This way we have a backward-compatible
536 * MSR in the 'normal' (checkpointed) mcontext and additionally one can
537 * also look at what type of transaction (T or S) was active at the
538 * time of the signal.
539 */
540 if (__put_user((msr >> 32), &tm_frame->mc_gregs[PT_MSR]))
541 return 1;
542
543#ifdef CONFIG_ALTIVEC
544 /* save altivec registers */
545 if (current->thread.used_vr) {
546 if (__copy_to_user(&frame->mc_vregs, ¤t->thread.ckvr_state,
547 ELF_NVRREG * sizeof(vector128)))
548 return 1;
549 if (msr & MSR_VEC) {
550 if (__copy_to_user(&tm_frame->mc_vregs,
551 ¤t->thread.vr_state,
552 ELF_NVRREG * sizeof(vector128)))
553 return 1;
554 } else {
555 if (__copy_to_user(&tm_frame->mc_vregs,
556 ¤t->thread.ckvr_state,
557 ELF_NVRREG * sizeof(vector128)))
558 return 1;
559 }
560
561 /* set MSR_VEC in the saved MSR value to indicate that
562 * frame->mc_vregs contains valid data
563 */
564 msr |= MSR_VEC;
565 }
566
567 /* We always copy to/from vrsave, it's 0 if we don't have or don't
568 * use altivec. Since VSCR only contains 32 bits saved in the least
569 * significant bits of a vector, we "cheat" and stuff VRSAVE in the
570 * most significant bits of that same vector. --BenH
571 */
572 if (cpu_has_feature(CPU_FTR_ALTIVEC))
573 current->thread.ckvrsave = mfspr(SPRN_VRSAVE);
574 if (__put_user(current->thread.ckvrsave,
575 (u32 __user *)&frame->mc_vregs[32]))
576 return 1;
577 if (msr & MSR_VEC) {
578 if (__put_user(current->thread.vrsave,
579 (u32 __user *)&tm_frame->mc_vregs[32]))
580 return 1;
581 } else {
582 if (__put_user(current->thread.ckvrsave,
583 (u32 __user *)&tm_frame->mc_vregs[32]))
584 return 1;
585 }
586#endif /* CONFIG_ALTIVEC */
587
588 if (copy_ckfpr_to_user(&frame->mc_fregs, current))
589 return 1;
590 if (msr & MSR_FP) {
591 if (copy_fpr_to_user(&tm_frame->mc_fregs, current))
592 return 1;
593 } else {
594 if (copy_ckfpr_to_user(&tm_frame->mc_fregs, current))
595 return 1;
596 }
597
598#ifdef CONFIG_VSX
599 /*
600 * Copy VSR 0-31 upper half from thread_struct to local
601 * buffer, then write that to userspace. Also set MSR_VSX in
602 * the saved MSR value to indicate that frame->mc_vregs
603 * contains valid data
604 */
605 if (current->thread.used_vsr) {
606 if (copy_ckvsx_to_user(&frame->mc_vsregs, current))
607 return 1;
608 if (msr & MSR_VSX) {
609 if (copy_vsx_to_user(&tm_frame->mc_vsregs,
610 current))
611 return 1;
612 } else {
613 if (copy_ckvsx_to_user(&tm_frame->mc_vsregs, current))
614 return 1;
615 }
616
617 msr |= MSR_VSX;
618 }
619#endif /* CONFIG_VSX */
620#ifdef CONFIG_SPE
621 /* SPE regs are not checkpointed with TM, so this section is
622 * simply the same as in save_user_regs().
623 */
624 if (current->thread.used_spe) {
625 flush_spe_to_thread(current);
626 if (__copy_to_user(&frame->mc_vregs, current->thread.evr,
627 ELF_NEVRREG * sizeof(u32)))
628 return 1;
629 /* set MSR_SPE in the saved MSR value to indicate that
630 * frame->mc_vregs contains valid data */
631 msr |= MSR_SPE;
632 }
633
634 /* We always copy to/from spefscr */
635 if (__put_user(current->thread.spefscr, (u32 __user *)&frame->mc_vregs + ELF_NEVRREG))
636 return 1;
637#endif /* CONFIG_SPE */
638
639 if (__put_user(msr, &frame->mc_gregs[PT_MSR]))
640 return 1;
641 if (sigret) {
642 /* Set up the sigreturn trampoline: li r0,sigret; sc */
643 if (__put_user(0x38000000UL + sigret, &frame->tramp[0])
644 || __put_user(0x44000002UL, &frame->tramp[1]))
645 return 1;
646 flush_icache_range((unsigned long) &frame->tramp[0],
647 (unsigned long) &frame->tramp[2]);
648 }
649
650 return 0;
651}
652#endif
653
654/*
655 * Restore the current user register values from the user stack,
656 * (except for MSR).
657 */
658static long restore_user_regs(struct pt_regs *regs,
659 struct mcontext __user *sr, int sig)
660{
661 long err;
662 unsigned int save_r2 = 0;
663 unsigned long msr;
664#ifdef CONFIG_VSX
665 int i;
666#endif
667
668 /*
669 * restore general registers but not including MSR or SOFTE. Also
670 * take care of keeping r2 (TLS) intact if not a signal
671 */
672 if (!sig)
673 save_r2 = (unsigned int)regs->gpr[2];
674 err = restore_general_regs(regs, sr);
675 regs->trap = 0;
676 err |= __get_user(msr, &sr->mc_gregs[PT_MSR]);
677 if (!sig)
678 regs->gpr[2] = (unsigned long) save_r2;
679 if (err)
680 return 1;
681
682 /* if doing signal return, restore the previous little-endian mode */
683 if (sig)
684 regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE);
685
686#ifdef CONFIG_ALTIVEC
687 /*
688 * Force the process to reload the altivec registers from
689 * current->thread when it next does altivec instructions
690 */
691 regs->msr &= ~MSR_VEC;
692 if (msr & MSR_VEC) {
693 /* restore altivec registers from the stack */
694 if (__copy_from_user(¤t->thread.vr_state, &sr->mc_vregs,
695 sizeof(sr->mc_vregs)))
696 return 1;
697 current->thread.used_vr = true;
698 } else if (current->thread.used_vr)
699 memset(¤t->thread.vr_state, 0,
700 ELF_NVRREG * sizeof(vector128));
701
702 /* Always get VRSAVE back */
703 if (__get_user(current->thread.vrsave, (u32 __user *)&sr->mc_vregs[32]))
704 return 1;
705 if (cpu_has_feature(CPU_FTR_ALTIVEC))
706 mtspr(SPRN_VRSAVE, current->thread.vrsave);
707#endif /* CONFIG_ALTIVEC */
708 if (copy_fpr_from_user(current, &sr->mc_fregs))
709 return 1;
710
711#ifdef CONFIG_VSX
712 /*
713 * Force the process to reload the VSX registers from
714 * current->thread when it next does VSX instruction.
715 */
716 regs->msr &= ~MSR_VSX;
717 if (msr & MSR_VSX) {
718 /*
719 * Restore altivec registers from the stack to a local
720 * buffer, then write this out to the thread_struct
721 */
722 if (copy_vsx_from_user(current, &sr->mc_vsregs))
723 return 1;
724 current->thread.used_vsr = true;
725 } else if (current->thread.used_vsr)
726 for (i = 0; i < 32 ; i++)
727 current->thread.fp_state.fpr[i][TS_VSRLOWOFFSET] = 0;
728#endif /* CONFIG_VSX */
729 /*
730 * force the process to reload the FP registers from
731 * current->thread when it next does FP instructions
732 */
733 regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1);
734
735#ifdef CONFIG_SPE
736 /* force the process to reload the spe registers from
737 current->thread when it next does spe instructions */
738 regs->msr &= ~MSR_SPE;
739 if (msr & MSR_SPE) {
740 /* restore spe registers from the stack */
741 if (__copy_from_user(current->thread.evr, &sr->mc_vregs,
742 ELF_NEVRREG * sizeof(u32)))
743 return 1;
744 current->thread.used_spe = true;
745 } else if (current->thread.used_spe)
746 memset(current->thread.evr, 0, ELF_NEVRREG * sizeof(u32));
747
748 /* Always get SPEFSCR back */
749 if (__get_user(current->thread.spefscr, (u32 __user *)&sr->mc_vregs + ELF_NEVRREG))
750 return 1;
751#endif /* CONFIG_SPE */
752
753 return 0;
754}
755
756#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
757/*
758 * Restore the current user register values from the user stack, except for
759 * MSR, and recheckpoint the original checkpointed register state for processes
760 * in transactions.
761 */
762static long restore_tm_user_regs(struct pt_regs *regs,
763 struct mcontext __user *sr,
764 struct mcontext __user *tm_sr)
765{
766 long err;
767 unsigned long msr, msr_hi;
768#ifdef CONFIG_VSX
769 int i;
770#endif
771
772 /*
773 * restore general registers but not including MSR or SOFTE. Also
774 * take care of keeping r2 (TLS) intact if not a signal.
775 * See comment in signal_64.c:restore_tm_sigcontexts();
776 * TFHAR is restored from the checkpointed NIP; TEXASR and TFIAR
777 * were set by the signal delivery.
778 */
779 err = restore_general_regs(regs, tm_sr);
780 err |= restore_general_regs(¤t->thread.ckpt_regs, sr);
781
782 err |= __get_user(current->thread.tm_tfhar, &sr->mc_gregs[PT_NIP]);
783
784 err |= __get_user(msr, &sr->mc_gregs[PT_MSR]);
785 if (err)
786 return 1;
787
788 /* Restore the previous little-endian mode */
789 regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE);
790
791#ifdef CONFIG_ALTIVEC
792 regs->msr &= ~MSR_VEC;
793 if (msr & MSR_VEC) {
794 /* restore altivec registers from the stack */
795 if (__copy_from_user(¤t->thread.ckvr_state, &sr->mc_vregs,
796 sizeof(sr->mc_vregs)) ||
797 __copy_from_user(¤t->thread.vr_state,
798 &tm_sr->mc_vregs,
799 sizeof(sr->mc_vregs)))
800 return 1;
801 current->thread.used_vr = true;
802 } else if (current->thread.used_vr) {
803 memset(¤t->thread.vr_state, 0,
804 ELF_NVRREG * sizeof(vector128));
805 memset(¤t->thread.ckvr_state, 0,
806 ELF_NVRREG * sizeof(vector128));
807 }
808
809 /* Always get VRSAVE back */
810 if (__get_user(current->thread.ckvrsave,
811 (u32 __user *)&sr->mc_vregs[32]) ||
812 __get_user(current->thread.vrsave,
813 (u32 __user *)&tm_sr->mc_vregs[32]))
814 return 1;
815 if (cpu_has_feature(CPU_FTR_ALTIVEC))
816 mtspr(SPRN_VRSAVE, current->thread.ckvrsave);
817#endif /* CONFIG_ALTIVEC */
818
819 regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1);
820
821 if (copy_fpr_from_user(current, &sr->mc_fregs) ||
822 copy_ckfpr_from_user(current, &tm_sr->mc_fregs))
823 return 1;
824
825#ifdef CONFIG_VSX
826 regs->msr &= ~MSR_VSX;
827 if (msr & MSR_VSX) {
828 /*
829 * Restore altivec registers from the stack to a local
830 * buffer, then write this out to the thread_struct
831 */
832 if (copy_vsx_from_user(current, &tm_sr->mc_vsregs) ||
833 copy_ckvsx_from_user(current, &sr->mc_vsregs))
834 return 1;
835 current->thread.used_vsr = true;
836 } else if (current->thread.used_vsr)
837 for (i = 0; i < 32 ; i++) {
838 current->thread.fp_state.fpr[i][TS_VSRLOWOFFSET] = 0;
839 current->thread.ckfp_state.fpr[i][TS_VSRLOWOFFSET] = 0;
840 }
841#endif /* CONFIG_VSX */
842
843#ifdef CONFIG_SPE
844 /* SPE regs are not checkpointed with TM, so this section is
845 * simply the same as in restore_user_regs().
846 */
847 regs->msr &= ~MSR_SPE;
848 if (msr & MSR_SPE) {
849 if (__copy_from_user(current->thread.evr, &sr->mc_vregs,
850 ELF_NEVRREG * sizeof(u32)))
851 return 1;
852 current->thread.used_spe = true;
853 } else if (current->thread.used_spe)
854 memset(current->thread.evr, 0, ELF_NEVRREG * sizeof(u32));
855
856 /* Always get SPEFSCR back */
857 if (__get_user(current->thread.spefscr, (u32 __user *)&sr->mc_vregs
858 + ELF_NEVRREG))
859 return 1;
860#endif /* CONFIG_SPE */
861
862 /* Get the top half of the MSR from the user context */
863 if (__get_user(msr_hi, &tm_sr->mc_gregs[PT_MSR]))
864 return 1;
865 msr_hi <<= 32;
866 /* If TM bits are set to the reserved value, it's an invalid context */
867 if (MSR_TM_RESV(msr_hi))
868 return 1;
869 /* Pull in the MSR TM bits from the user context */
870 regs->msr = (regs->msr & ~MSR_TS_MASK) | (msr_hi & MSR_TS_MASK);
871 /* Now, recheckpoint. This loads up all of the checkpointed (older)
872 * registers, including FP and V[S]Rs. After recheckpointing, the
873 * transactional versions should be loaded.
874 */
875 tm_enable();
876 /* Make sure the transaction is marked as failed */
877 current->thread.tm_texasr |= TEXASR_FS;
878 /* This loads the checkpointed FP/VEC state, if used */
879 tm_recheckpoint(¤t->thread, msr);
880
881 /* This loads the speculative FP/VEC state, if used */
882 msr_check_and_set(msr & (MSR_FP | MSR_VEC));
883 if (msr & MSR_FP) {
884 load_fp_state(¤t->thread.fp_state);
885 regs->msr |= (MSR_FP | current->thread.fpexc_mode);
886 }
887#ifdef CONFIG_ALTIVEC
888 if (msr & MSR_VEC) {
889 load_vr_state(¤t->thread.vr_state);
890 regs->msr |= MSR_VEC;
891 }
892#endif
893
894 return 0;
895}
896#endif
897
898#ifdef CONFIG_PPC64
899int copy_siginfo_to_user32(struct compat_siginfo __user *d, const siginfo_t *s)
900{
901 int err;
902
903 if (!access_ok (VERIFY_WRITE, d, sizeof(*d)))
904 return -EFAULT;
905
906 /* If you change siginfo_t structure, please be sure
907 * this code is fixed accordingly.
908 * It should never copy any pad contained in the structure
909 * to avoid security leaks, but must copy the generic
910 * 3 ints plus the relevant union member.
911 * This routine must convert siginfo from 64bit to 32bit as well
912 * at the same time.
913 */
914 err = __put_user(s->si_signo, &d->si_signo);
915 err |= __put_user(s->si_errno, &d->si_errno);
916 err |= __put_user((short)s->si_code, &d->si_code);
917 if (s->si_code < 0)
918 err |= __copy_to_user(&d->_sifields._pad, &s->_sifields._pad,
919 SI_PAD_SIZE32);
920 else switch(s->si_code >> 16) {
921 case __SI_CHLD >> 16:
922 err |= __put_user(s->si_pid, &d->si_pid);
923 err |= __put_user(s->si_uid, &d->si_uid);
924 err |= __put_user(s->si_utime, &d->si_utime);
925 err |= __put_user(s->si_stime, &d->si_stime);
926 err |= __put_user(s->si_status, &d->si_status);
927 break;
928 case __SI_FAULT >> 16:
929 err |= __put_user((unsigned int)(unsigned long)s->si_addr,
930 &d->si_addr);
931 break;
932 case __SI_POLL >> 16:
933 err |= __put_user(s->si_band, &d->si_band);
934 err |= __put_user(s->si_fd, &d->si_fd);
935 break;
936 case __SI_TIMER >> 16:
937 err |= __put_user(s->si_tid, &d->si_tid);
938 err |= __put_user(s->si_overrun, &d->si_overrun);
939 err |= __put_user(s->si_int, &d->si_int);
940 break;
941 case __SI_SYS >> 16:
942 err |= __put_user(ptr_to_compat(s->si_call_addr), &d->si_call_addr);
943 err |= __put_user(s->si_syscall, &d->si_syscall);
944 err |= __put_user(s->si_arch, &d->si_arch);
945 break;
946 case __SI_RT >> 16: /* This is not generated by the kernel as of now. */
947 case __SI_MESGQ >> 16:
948 err |= __put_user(s->si_int, &d->si_int);
949 /* fallthrough */
950 case __SI_KILL >> 16:
951 default:
952 err |= __put_user(s->si_pid, &d->si_pid);
953 err |= __put_user(s->si_uid, &d->si_uid);
954 break;
955 }
956 return err;
957}
958
959#define copy_siginfo_to_user copy_siginfo_to_user32
960
961int copy_siginfo_from_user32(siginfo_t *to, struct compat_siginfo __user *from)
962{
963 if (copy_from_user(to, from, 3*sizeof(int)) ||
964 copy_from_user(to->_sifields._pad,
965 from->_sifields._pad, SI_PAD_SIZE32))
966 return -EFAULT;
967
968 return 0;
969}
970#endif /* CONFIG_PPC64 */
971
972/*
973 * Set up a signal frame for a "real-time" signal handler
974 * (one which gets siginfo).
975 */
976int handle_rt_signal32(struct ksignal *ksig, sigset_t *oldset,
977 struct task_struct *tsk)
978{
979 struct rt_sigframe __user *rt_sf;
980 struct mcontext __user *frame;
981 struct mcontext __user *tm_frame = NULL;
982 void __user *addr;
983 unsigned long newsp = 0;
984 int sigret;
985 unsigned long tramp;
986 struct pt_regs *regs = tsk->thread.regs;
987
988 BUG_ON(tsk != current);
989
990 /* Set up Signal Frame */
991 /* Put a Real Time Context onto stack */
992 rt_sf = get_sigframe(ksig, get_tm_stackpointer(tsk), sizeof(*rt_sf), 1);
993 addr = rt_sf;
994 if (unlikely(rt_sf == NULL))
995 goto badframe;
996
997 /* Put the siginfo & fill in most of the ucontext */
998 if (copy_siginfo_to_user(&rt_sf->info, &ksig->info)
999 || __put_user(0, &rt_sf->uc.uc_flags)
1000 || __save_altstack(&rt_sf->uc.uc_stack, regs->gpr[1])
1001 || __put_user(to_user_ptr(&rt_sf->uc.uc_mcontext),
1002 &rt_sf->uc.uc_regs)
1003 || put_sigset_t(&rt_sf->uc.uc_sigmask, oldset))
1004 goto badframe;
1005
1006 /* Save user registers on the stack */
1007 frame = &rt_sf->uc.uc_mcontext;
1008 addr = frame;
1009 if (vdso32_rt_sigtramp && tsk->mm->context.vdso_base) {
1010 sigret = 0;
1011 tramp = tsk->mm->context.vdso_base + vdso32_rt_sigtramp;
1012 } else {
1013 sigret = __NR_rt_sigreturn;
1014 tramp = (unsigned long) frame->tramp;
1015 }
1016
1017#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1018 tm_frame = &rt_sf->uc_transact.uc_mcontext;
1019 if (MSR_TM_ACTIVE(regs->msr)) {
1020 if (__put_user((unsigned long)&rt_sf->uc_transact,
1021 &rt_sf->uc.uc_link) ||
1022 __put_user((unsigned long)tm_frame,
1023 &rt_sf->uc_transact.uc_regs))
1024 goto badframe;
1025 if (save_tm_user_regs(regs, frame, tm_frame, sigret))
1026 goto badframe;
1027 }
1028 else
1029#endif
1030 {
1031 if (__put_user(0, &rt_sf->uc.uc_link))
1032 goto badframe;
1033 if (save_user_regs(regs, frame, tm_frame, sigret, 1))
1034 goto badframe;
1035 }
1036 regs->link = tramp;
1037
1038 tsk->thread.fp_state.fpscr = 0; /* turn off all fp exceptions */
1039
1040 /* create a stack frame for the caller of the handler */
1041 newsp = ((unsigned long)rt_sf) - (__SIGNAL_FRAMESIZE + 16);
1042 addr = (void __user *)regs->gpr[1];
1043 if (put_user(regs->gpr[1], (u32 __user *)newsp))
1044 goto badframe;
1045
1046 /* Fill registers for signal handler */
1047 regs->gpr[1] = newsp;
1048 regs->gpr[3] = ksig->sig;
1049 regs->gpr[4] = (unsigned long) &rt_sf->info;
1050 regs->gpr[5] = (unsigned long) &rt_sf->uc;
1051 regs->gpr[6] = (unsigned long) rt_sf;
1052 regs->nip = (unsigned long) ksig->ka.sa.sa_handler;
1053 /* enter the signal handler in native-endian mode */
1054 regs->msr &= ~MSR_LE;
1055 regs->msr |= (MSR_KERNEL & MSR_LE);
1056 return 0;
1057
1058badframe:
1059 if (show_unhandled_signals)
1060 printk_ratelimited(KERN_INFO
1061 "%s[%d]: bad frame in handle_rt_signal32: "
1062 "%p nip %08lx lr %08lx\n",
1063 tsk->comm, tsk->pid,
1064 addr, regs->nip, regs->link);
1065
1066 return 1;
1067}
1068
1069static int do_setcontext(struct ucontext __user *ucp, struct pt_regs *regs, int sig)
1070{
1071 sigset_t set;
1072 struct mcontext __user *mcp;
1073
1074 if (get_sigset_t(&set, &ucp->uc_sigmask))
1075 return -EFAULT;
1076#ifdef CONFIG_PPC64
1077 {
1078 u32 cmcp;
1079
1080 if (__get_user(cmcp, &ucp->uc_regs))
1081 return -EFAULT;
1082 mcp = (struct mcontext __user *)(u64)cmcp;
1083 /* no need to check access_ok(mcp), since mcp < 4GB */
1084 }
1085#else
1086 if (__get_user(mcp, &ucp->uc_regs))
1087 return -EFAULT;
1088 if (!access_ok(VERIFY_READ, mcp, sizeof(*mcp)))
1089 return -EFAULT;
1090#endif
1091 set_current_blocked(&set);
1092 if (restore_user_regs(regs, mcp, sig))
1093 return -EFAULT;
1094
1095 return 0;
1096}
1097
1098#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1099static int do_setcontext_tm(struct ucontext __user *ucp,
1100 struct ucontext __user *tm_ucp,
1101 struct pt_regs *regs)
1102{
1103 sigset_t set;
1104 struct mcontext __user *mcp;
1105 struct mcontext __user *tm_mcp;
1106 u32 cmcp;
1107 u32 tm_cmcp;
1108
1109 if (get_sigset_t(&set, &ucp->uc_sigmask))
1110 return -EFAULT;
1111
1112 if (__get_user(cmcp, &ucp->uc_regs) ||
1113 __get_user(tm_cmcp, &tm_ucp->uc_regs))
1114 return -EFAULT;
1115 mcp = (struct mcontext __user *)(u64)cmcp;
1116 tm_mcp = (struct mcontext __user *)(u64)tm_cmcp;
1117 /* no need to check access_ok(mcp), since mcp < 4GB */
1118
1119 set_current_blocked(&set);
1120 if (restore_tm_user_regs(regs, mcp, tm_mcp))
1121 return -EFAULT;
1122
1123 return 0;
1124}
1125#endif
1126
1127long sys_swapcontext(struct ucontext __user *old_ctx,
1128 struct ucontext __user *new_ctx,
1129 int ctx_size, int r6, int r7, int r8, struct pt_regs *regs)
1130{
1131 unsigned char tmp;
1132 int ctx_has_vsx_region = 0;
1133
1134#ifdef CONFIG_PPC64
1135 unsigned long new_msr = 0;
1136
1137 if (new_ctx) {
1138 struct mcontext __user *mcp;
1139 u32 cmcp;
1140
1141 /*
1142 * Get pointer to the real mcontext. No need for
1143 * access_ok since we are dealing with compat
1144 * pointers.
1145 */
1146 if (__get_user(cmcp, &new_ctx->uc_regs))
1147 return -EFAULT;
1148 mcp = (struct mcontext __user *)(u64)cmcp;
1149 if (__get_user(new_msr, &mcp->mc_gregs[PT_MSR]))
1150 return -EFAULT;
1151 }
1152 /*
1153 * Check that the context is not smaller than the original
1154 * size (with VMX but without VSX)
1155 */
1156 if (ctx_size < UCONTEXTSIZEWITHOUTVSX)
1157 return -EINVAL;
1158 /*
1159 * If the new context state sets the MSR VSX bits but
1160 * it doesn't provide VSX state.
1161 */
1162 if ((ctx_size < sizeof(struct ucontext)) &&
1163 (new_msr & MSR_VSX))
1164 return -EINVAL;
1165 /* Does the context have enough room to store VSX data? */
1166 if (ctx_size >= sizeof(struct ucontext))
1167 ctx_has_vsx_region = 1;
1168#else
1169 /* Context size is for future use. Right now, we only make sure
1170 * we are passed something we understand
1171 */
1172 if (ctx_size < sizeof(struct ucontext))
1173 return -EINVAL;
1174#endif
1175 if (old_ctx != NULL) {
1176 struct mcontext __user *mctx;
1177
1178 /*
1179 * old_ctx might not be 16-byte aligned, in which
1180 * case old_ctx->uc_mcontext won't be either.
1181 * Because we have the old_ctx->uc_pad2 field
1182 * before old_ctx->uc_mcontext, we need to round down
1183 * from &old_ctx->uc_mcontext to a 16-byte boundary.
1184 */
1185 mctx = (struct mcontext __user *)
1186 ((unsigned long) &old_ctx->uc_mcontext & ~0xfUL);
1187 if (!access_ok(VERIFY_WRITE, old_ctx, ctx_size)
1188 || save_user_regs(regs, mctx, NULL, 0, ctx_has_vsx_region)
1189 || put_sigset_t(&old_ctx->uc_sigmask, ¤t->blocked)
1190 || __put_user(to_user_ptr(mctx), &old_ctx->uc_regs))
1191 return -EFAULT;
1192 }
1193 if (new_ctx == NULL)
1194 return 0;
1195 if (!access_ok(VERIFY_READ, new_ctx, ctx_size)
1196 || __get_user(tmp, (u8 __user *) new_ctx)
1197 || __get_user(tmp, (u8 __user *) new_ctx + ctx_size - 1))
1198 return -EFAULT;
1199
1200 /*
1201 * If we get a fault copying the context into the kernel's
1202 * image of the user's registers, we can't just return -EFAULT
1203 * because the user's registers will be corrupted. For instance
1204 * the NIP value may have been updated but not some of the
1205 * other registers. Given that we have done the access_ok
1206 * and successfully read the first and last bytes of the region
1207 * above, this should only happen in an out-of-memory situation
1208 * or if another thread unmaps the region containing the context.
1209 * We kill the task with a SIGSEGV in this situation.
1210 */
1211 if (do_setcontext(new_ctx, regs, 0))
1212 do_exit(SIGSEGV);
1213
1214 set_thread_flag(TIF_RESTOREALL);
1215 return 0;
1216}
1217
1218long sys_rt_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8,
1219 struct pt_regs *regs)
1220{
1221 struct rt_sigframe __user *rt_sf;
1222#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1223 struct ucontext __user *uc_transact;
1224 unsigned long msr_hi;
1225 unsigned long tmp;
1226 int tm_restore = 0;
1227#endif
1228 /* Always make any pending restarted system calls return -EINTR */
1229 current->restart_block.fn = do_no_restart_syscall;
1230
1231 rt_sf = (struct rt_sigframe __user *)
1232 (regs->gpr[1] + __SIGNAL_FRAMESIZE + 16);
1233 if (!access_ok(VERIFY_READ, rt_sf, sizeof(*rt_sf)))
1234 goto bad;
1235
1236#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1237 /*
1238 * If there is a transactional state then throw it away.
1239 * The purpose of a sigreturn is to destroy all traces of the
1240 * signal frame, this includes any transactional state created
1241 * within in. We only check for suspended as we can never be
1242 * active in the kernel, we are active, there is nothing better to
1243 * do than go ahead and Bad Thing later.
1244 * The cause is not important as there will never be a
1245 * recheckpoint so it's not user visible.
1246 */
1247 if (MSR_TM_SUSPENDED(mfmsr()))
1248 tm_reclaim_current(0);
1249
1250 if (__get_user(tmp, &rt_sf->uc.uc_link))
1251 goto bad;
1252 uc_transact = (struct ucontext __user *)(uintptr_t)tmp;
1253 if (uc_transact) {
1254 u32 cmcp;
1255 struct mcontext __user *mcp;
1256
1257 if (__get_user(cmcp, &uc_transact->uc_regs))
1258 return -EFAULT;
1259 mcp = (struct mcontext __user *)(u64)cmcp;
1260 /* The top 32 bits of the MSR are stashed in the transactional
1261 * ucontext. */
1262 if (__get_user(msr_hi, &mcp->mc_gregs[PT_MSR]))
1263 goto bad;
1264
1265 if (MSR_TM_ACTIVE(msr_hi<<32)) {
1266 /* We only recheckpoint on return if we're
1267 * transaction.
1268 */
1269 tm_restore = 1;
1270 if (do_setcontext_tm(&rt_sf->uc, uc_transact, regs))
1271 goto bad;
1272 }
1273 }
1274 if (!tm_restore)
1275 /* Fall through, for non-TM restore */
1276#endif
1277 if (do_setcontext(&rt_sf->uc, regs, 1))
1278 goto bad;
1279
1280 /*
1281 * It's not clear whether or why it is desirable to save the
1282 * sigaltstack setting on signal delivery and restore it on
1283 * signal return. But other architectures do this and we have
1284 * always done it up until now so it is probably better not to
1285 * change it. -- paulus
1286 */
1287#ifdef CONFIG_PPC64
1288 if (compat_restore_altstack(&rt_sf->uc.uc_stack))
1289 goto bad;
1290#else
1291 if (restore_altstack(&rt_sf->uc.uc_stack))
1292 goto bad;
1293#endif
1294 set_thread_flag(TIF_RESTOREALL);
1295 return 0;
1296
1297 bad:
1298 if (show_unhandled_signals)
1299 printk_ratelimited(KERN_INFO
1300 "%s[%d]: bad frame in sys_rt_sigreturn: "
1301 "%p nip %08lx lr %08lx\n",
1302 current->comm, current->pid,
1303 rt_sf, regs->nip, regs->link);
1304
1305 force_sig(SIGSEGV, current);
1306 return 0;
1307}
1308
1309#ifdef CONFIG_PPC32
1310int sys_debug_setcontext(struct ucontext __user *ctx,
1311 int ndbg, struct sig_dbg_op __user *dbg,
1312 int r6, int r7, int r8,
1313 struct pt_regs *regs)
1314{
1315 struct sig_dbg_op op;
1316 int i;
1317 unsigned char tmp;
1318 unsigned long new_msr = regs->msr;
1319#ifdef CONFIG_PPC_ADV_DEBUG_REGS
1320 unsigned long new_dbcr0 = current->thread.debug.dbcr0;
1321#endif
1322
1323 for (i=0; i<ndbg; i++) {
1324 if (copy_from_user(&op, dbg + i, sizeof(op)))
1325 return -EFAULT;
1326 switch (op.dbg_type) {
1327 case SIG_DBG_SINGLE_STEPPING:
1328#ifdef CONFIG_PPC_ADV_DEBUG_REGS
1329 if (op.dbg_value) {
1330 new_msr |= MSR_DE;
1331 new_dbcr0 |= (DBCR0_IDM | DBCR0_IC);
1332 } else {
1333 new_dbcr0 &= ~DBCR0_IC;
1334 if (!DBCR_ACTIVE_EVENTS(new_dbcr0,
1335 current->thread.debug.dbcr1)) {
1336 new_msr &= ~MSR_DE;
1337 new_dbcr0 &= ~DBCR0_IDM;
1338 }
1339 }
1340#else
1341 if (op.dbg_value)
1342 new_msr |= MSR_SE;
1343 else
1344 new_msr &= ~MSR_SE;
1345#endif
1346 break;
1347 case SIG_DBG_BRANCH_TRACING:
1348#ifdef CONFIG_PPC_ADV_DEBUG_REGS
1349 return -EINVAL;
1350#else
1351 if (op.dbg_value)
1352 new_msr |= MSR_BE;
1353 else
1354 new_msr &= ~MSR_BE;
1355#endif
1356 break;
1357
1358 default:
1359 return -EINVAL;
1360 }
1361 }
1362
1363 /* We wait until here to actually install the values in the
1364 registers so if we fail in the above loop, it will not
1365 affect the contents of these registers. After this point,
1366 failure is a problem, anyway, and it's very unlikely unless
1367 the user is really doing something wrong. */
1368 regs->msr = new_msr;
1369#ifdef CONFIG_PPC_ADV_DEBUG_REGS
1370 current->thread.debug.dbcr0 = new_dbcr0;
1371#endif
1372
1373 if (!access_ok(VERIFY_READ, ctx, sizeof(*ctx))
1374 || __get_user(tmp, (u8 __user *) ctx)
1375 || __get_user(tmp, (u8 __user *) (ctx + 1) - 1))
1376 return -EFAULT;
1377
1378 /*
1379 * If we get a fault copying the context into the kernel's
1380 * image of the user's registers, we can't just return -EFAULT
1381 * because the user's registers will be corrupted. For instance
1382 * the NIP value may have been updated but not some of the
1383 * other registers. Given that we have done the access_ok
1384 * and successfully read the first and last bytes of the region
1385 * above, this should only happen in an out-of-memory situation
1386 * or if another thread unmaps the region containing the context.
1387 * We kill the task with a SIGSEGV in this situation.
1388 */
1389 if (do_setcontext(ctx, regs, 1)) {
1390 if (show_unhandled_signals)
1391 printk_ratelimited(KERN_INFO "%s[%d]: bad frame in "
1392 "sys_debug_setcontext: %p nip %08lx "
1393 "lr %08lx\n",
1394 current->comm, current->pid,
1395 ctx, regs->nip, regs->link);
1396
1397 force_sig(SIGSEGV, current);
1398 goto out;
1399 }
1400
1401 /*
1402 * It's not clear whether or why it is desirable to save the
1403 * sigaltstack setting on signal delivery and restore it on
1404 * signal return. But other architectures do this and we have
1405 * always done it up until now so it is probably better not to
1406 * change it. -- paulus
1407 */
1408 restore_altstack(&ctx->uc_stack);
1409
1410 set_thread_flag(TIF_RESTOREALL);
1411 out:
1412 return 0;
1413}
1414#endif
1415
1416/*
1417 * OK, we're invoking a handler
1418 */
1419int handle_signal32(struct ksignal *ksig, sigset_t *oldset,
1420 struct task_struct *tsk)
1421{
1422 struct sigcontext __user *sc;
1423 struct sigframe __user *frame;
1424 struct mcontext __user *tm_mctx = NULL;
1425 unsigned long newsp = 0;
1426 int sigret;
1427 unsigned long tramp;
1428 struct pt_regs *regs = tsk->thread.regs;
1429
1430 BUG_ON(tsk != current);
1431
1432 /* Set up Signal Frame */
1433 frame = get_sigframe(ksig, get_tm_stackpointer(tsk), sizeof(*frame), 1);
1434 if (unlikely(frame == NULL))
1435 goto badframe;
1436 sc = (struct sigcontext __user *) &frame->sctx;
1437
1438#if _NSIG != 64
1439#error "Please adjust handle_signal()"
1440#endif
1441 if (__put_user(to_user_ptr(ksig->ka.sa.sa_handler), &sc->handler)
1442 || __put_user(oldset->sig[0], &sc->oldmask)
1443#ifdef CONFIG_PPC64
1444 || __put_user((oldset->sig[0] >> 32), &sc->_unused[3])
1445#else
1446 || __put_user(oldset->sig[1], &sc->_unused[3])
1447#endif
1448 || __put_user(to_user_ptr(&frame->mctx), &sc->regs)
1449 || __put_user(ksig->sig, &sc->signal))
1450 goto badframe;
1451
1452 if (vdso32_sigtramp && tsk->mm->context.vdso_base) {
1453 sigret = 0;
1454 tramp = tsk->mm->context.vdso_base + vdso32_sigtramp;
1455 } else {
1456 sigret = __NR_sigreturn;
1457 tramp = (unsigned long) frame->mctx.tramp;
1458 }
1459
1460#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1461 tm_mctx = &frame->mctx_transact;
1462 if (MSR_TM_ACTIVE(regs->msr)) {
1463 if (save_tm_user_regs(regs, &frame->mctx, &frame->mctx_transact,
1464 sigret))
1465 goto badframe;
1466 }
1467 else
1468#endif
1469 {
1470 if (save_user_regs(regs, &frame->mctx, tm_mctx, sigret, 1))
1471 goto badframe;
1472 }
1473
1474 regs->link = tramp;
1475
1476 tsk->thread.fp_state.fpscr = 0; /* turn off all fp exceptions */
1477
1478 /* create a stack frame for the caller of the handler */
1479 newsp = ((unsigned long)frame) - __SIGNAL_FRAMESIZE;
1480 if (put_user(regs->gpr[1], (u32 __user *)newsp))
1481 goto badframe;
1482
1483 regs->gpr[1] = newsp;
1484 regs->gpr[3] = ksig->sig;
1485 regs->gpr[4] = (unsigned long) sc;
1486 regs->nip = (unsigned long) (unsigned long)ksig->ka.sa.sa_handler;
1487 /* enter the signal handler in big-endian mode */
1488 regs->msr &= ~MSR_LE;
1489 return 0;
1490
1491badframe:
1492 if (show_unhandled_signals)
1493 printk_ratelimited(KERN_INFO
1494 "%s[%d]: bad frame in handle_signal32: "
1495 "%p nip %08lx lr %08lx\n",
1496 tsk->comm, tsk->pid,
1497 frame, regs->nip, regs->link);
1498
1499 return 1;
1500}
1501
1502/*
1503 * Do a signal return; undo the signal stack.
1504 */
1505long sys_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8,
1506 struct pt_regs *regs)
1507{
1508 struct sigframe __user *sf;
1509 struct sigcontext __user *sc;
1510 struct sigcontext sigctx;
1511 struct mcontext __user *sr;
1512 void __user *addr;
1513 sigset_t set;
1514#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1515 struct mcontext __user *mcp, *tm_mcp;
1516 unsigned long msr_hi;
1517#endif
1518
1519 /* Always make any pending restarted system calls return -EINTR */
1520 current->restart_block.fn = do_no_restart_syscall;
1521
1522 sf = (struct sigframe __user *)(regs->gpr[1] + __SIGNAL_FRAMESIZE);
1523 sc = &sf->sctx;
1524 addr = sc;
1525 if (copy_from_user(&sigctx, sc, sizeof(sigctx)))
1526 goto badframe;
1527
1528#ifdef CONFIG_PPC64
1529 /*
1530 * Note that PPC32 puts the upper 32 bits of the sigmask in the
1531 * unused part of the signal stackframe
1532 */
1533 set.sig[0] = sigctx.oldmask + ((long)(sigctx._unused[3]) << 32);
1534#else
1535 set.sig[0] = sigctx.oldmask;
1536 set.sig[1] = sigctx._unused[3];
1537#endif
1538 set_current_blocked(&set);
1539
1540#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1541 mcp = (struct mcontext __user *)&sf->mctx;
1542 tm_mcp = (struct mcontext __user *)&sf->mctx_transact;
1543 if (__get_user(msr_hi, &tm_mcp->mc_gregs[PT_MSR]))
1544 goto badframe;
1545 if (MSR_TM_ACTIVE(msr_hi<<32)) {
1546 if (!cpu_has_feature(CPU_FTR_TM))
1547 goto badframe;
1548 if (restore_tm_user_regs(regs, mcp, tm_mcp))
1549 goto badframe;
1550 } else
1551#endif
1552 {
1553 sr = (struct mcontext __user *)from_user_ptr(sigctx.regs);
1554 addr = sr;
1555 if (!access_ok(VERIFY_READ, sr, sizeof(*sr))
1556 || restore_user_regs(regs, sr, 1))
1557 goto badframe;
1558 }
1559
1560 set_thread_flag(TIF_RESTOREALL);
1561 return 0;
1562
1563badframe:
1564 if (show_unhandled_signals)
1565 printk_ratelimited(KERN_INFO
1566 "%s[%d]: bad frame in sys_sigreturn: "
1567 "%p nip %08lx lr %08lx\n",
1568 current->comm, current->pid,
1569 addr, regs->nip, regs->link);
1570
1571 force_sig(SIGSEGV, current);
1572 return 0;
1573}