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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#include <linux/freezer.h>
39#endif
40
41#include <asm/uaccess.h>
42#include <asm/cacheflush.h>
43#include <asm/syscalls.h>
44#include <asm/sigcontext.h>
45#include <asm/vdso.h>
46#include <asm/switch_to.h>
47#ifdef CONFIG_PPC64
48#include "ppc32.h"
49#include <asm/unistd.h>
50#else
51#include <asm/ucontext.h>
52#include <asm/pgtable.h>
53#endif
54
55#include "signal.h"
56
57#undef DEBUG_SIG
58
59#ifdef CONFIG_PPC64
60#define sys_sigsuspend compat_sys_sigsuspend
61#define sys_rt_sigsuspend compat_sys_rt_sigsuspend
62#define sys_rt_sigreturn compat_sys_rt_sigreturn
63#define sys_sigaction compat_sys_sigaction
64#define sys_swapcontext compat_sys_swapcontext
65#define sys_sigreturn compat_sys_sigreturn
66
67#define old_sigaction old_sigaction32
68#define sigcontext sigcontext32
69#define mcontext mcontext32
70#define ucontext ucontext32
71
72/*
73 * Userspace code may pass a ucontext which doesn't include VSX added
74 * at the end. We need to check for this case.
75 */
76#define UCONTEXTSIZEWITHOUTVSX \
77 (sizeof(struct ucontext) - sizeof(elf_vsrreghalf_t32))
78
79/*
80 * Returning 0 means we return to userspace via
81 * ret_from_except and thus restore all user
82 * registers from *regs. This is what we need
83 * to do when a signal has been delivered.
84 */
85
86#define GP_REGS_SIZE min(sizeof(elf_gregset_t32), sizeof(struct pt_regs32))
87#undef __SIGNAL_FRAMESIZE
88#define __SIGNAL_FRAMESIZE __SIGNAL_FRAMESIZE32
89#undef ELF_NVRREG
90#define ELF_NVRREG ELF_NVRREG32
91
92/*
93 * Functions for flipping sigsets (thanks to brain dead generic
94 * implementation that makes things simple for little endian only)
95 */
96static inline int put_sigset_t(compat_sigset_t __user *uset, sigset_t *set)
97{
98 compat_sigset_t cset;
99
100 switch (_NSIG_WORDS) {
101 case 4: cset.sig[6] = set->sig[3] & 0xffffffffull;
102 cset.sig[7] = set->sig[3] >> 32;
103 case 3: cset.sig[4] = set->sig[2] & 0xffffffffull;
104 cset.sig[5] = set->sig[2] >> 32;
105 case 2: cset.sig[2] = set->sig[1] & 0xffffffffull;
106 cset.sig[3] = set->sig[1] >> 32;
107 case 1: cset.sig[0] = set->sig[0] & 0xffffffffull;
108 cset.sig[1] = set->sig[0] >> 32;
109 }
110 return copy_to_user(uset, &cset, sizeof(*uset));
111}
112
113static inline int get_sigset_t(sigset_t *set,
114 const compat_sigset_t __user *uset)
115{
116 compat_sigset_t s32;
117
118 if (copy_from_user(&s32, uset, sizeof(*uset)))
119 return -EFAULT;
120
121 /*
122 * Swap the 2 words of the 64-bit sigset_t (they are stored
123 * in the "wrong" endian in 32-bit user storage).
124 */
125 switch (_NSIG_WORDS) {
126 case 4: set->sig[3] = s32.sig[6] | (((long)s32.sig[7]) << 32);
127 case 3: set->sig[2] = s32.sig[4] | (((long)s32.sig[5]) << 32);
128 case 2: set->sig[1] = s32.sig[2] | (((long)s32.sig[3]) << 32);
129 case 1: set->sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32);
130 }
131 return 0;
132}
133
134static inline int get_old_sigaction(struct k_sigaction *new_ka,
135 struct old_sigaction __user *act)
136{
137 compat_old_sigset_t mask;
138 compat_uptr_t handler, restorer;
139
140 if (get_user(handler, &act->sa_handler) ||
141 __get_user(restorer, &act->sa_restorer) ||
142 __get_user(new_ka->sa.sa_flags, &act->sa_flags) ||
143 __get_user(mask, &act->sa_mask))
144 return -EFAULT;
145 new_ka->sa.sa_handler = compat_ptr(handler);
146 new_ka->sa.sa_restorer = compat_ptr(restorer);
147 siginitset(&new_ka->sa.sa_mask, mask);
148 return 0;
149}
150
151#define to_user_ptr(p) ptr_to_compat(p)
152#define from_user_ptr(p) compat_ptr(p)
153
154static inline int save_general_regs(struct pt_regs *regs,
155 struct mcontext __user *frame)
156{
157 elf_greg_t64 *gregs = (elf_greg_t64 *)regs;
158 int i;
159
160 WARN_ON(!FULL_REGS(regs));
161
162 for (i = 0; i <= PT_RESULT; i ++) {
163 if (i == 14 && !FULL_REGS(regs))
164 i = 32;
165 if (__put_user((unsigned int)gregs[i], &frame->mc_gregs[i]))
166 return -EFAULT;
167 }
168 return 0;
169}
170
171static inline int restore_general_regs(struct pt_regs *regs,
172 struct mcontext __user *sr)
173{
174 elf_greg_t64 *gregs = (elf_greg_t64 *)regs;
175 int i;
176
177 for (i = 0; i <= PT_RESULT; i++) {
178 if ((i == PT_MSR) || (i == PT_SOFTE))
179 continue;
180 if (__get_user(gregs[i], &sr->mc_gregs[i]))
181 return -EFAULT;
182 }
183 return 0;
184}
185
186#else /* CONFIG_PPC64 */
187
188#define GP_REGS_SIZE min(sizeof(elf_gregset_t), sizeof(struct pt_regs))
189
190static inline int put_sigset_t(sigset_t __user *uset, sigset_t *set)
191{
192 return copy_to_user(uset, set, sizeof(*uset));
193}
194
195static inline int get_sigset_t(sigset_t *set, const sigset_t __user *uset)
196{
197 return copy_from_user(set, uset, sizeof(*uset));
198}
199
200static inline int get_old_sigaction(struct k_sigaction *new_ka,
201 struct old_sigaction __user *act)
202{
203 old_sigset_t mask;
204
205 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
206 __get_user(new_ka->sa.sa_handler, &act->sa_handler) ||
207 __get_user(new_ka->sa.sa_restorer, &act->sa_restorer) ||
208 __get_user(new_ka->sa.sa_flags, &act->sa_flags) ||
209 __get_user(mask, &act->sa_mask))
210 return -EFAULT;
211 siginitset(&new_ka->sa.sa_mask, mask);
212 return 0;
213}
214
215#define to_user_ptr(p) ((unsigned long)(p))
216#define from_user_ptr(p) ((void __user *)(p))
217
218static inline int save_general_regs(struct pt_regs *regs,
219 struct mcontext __user *frame)
220{
221 WARN_ON(!FULL_REGS(regs));
222 return __copy_to_user(&frame->mc_gregs, regs, GP_REGS_SIZE);
223}
224
225static inline int restore_general_regs(struct pt_regs *regs,
226 struct mcontext __user *sr)
227{
228 /* copy up to but not including MSR */
229 if (__copy_from_user(regs, &sr->mc_gregs,
230 PT_MSR * sizeof(elf_greg_t)))
231 return -EFAULT;
232 /* copy from orig_r3 (the word after the MSR) up to the end */
233 if (__copy_from_user(®s->orig_gpr3, &sr->mc_gregs[PT_ORIG_R3],
234 GP_REGS_SIZE - PT_ORIG_R3 * sizeof(elf_greg_t)))
235 return -EFAULT;
236 return 0;
237}
238
239#endif /* CONFIG_PPC64 */
240
241/*
242 * Atomically swap in the new signal mask, and wait for a signal.
243 */
244long sys_sigsuspend(old_sigset_t mask)
245{
246 sigset_t blocked;
247 siginitset(&blocked, mask);
248 return sigsuspend(&blocked);
249}
250
251long sys_sigaction(int sig, struct old_sigaction __user *act,
252 struct old_sigaction __user *oact)
253{
254 struct k_sigaction new_ka, old_ka;
255 int ret;
256
257#ifdef CONFIG_PPC64
258 if (sig < 0)
259 sig = -sig;
260#endif
261
262 if (act) {
263 if (get_old_sigaction(&new_ka, act))
264 return -EFAULT;
265 }
266
267 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
268 if (!ret && oact) {
269 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
270 __put_user(to_user_ptr(old_ka.sa.sa_handler),
271 &oact->sa_handler) ||
272 __put_user(to_user_ptr(old_ka.sa.sa_restorer),
273 &oact->sa_restorer) ||
274 __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
275 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
276 return -EFAULT;
277 }
278
279 return ret;
280}
281
282/*
283 * When we have signals to deliver, we set up on the
284 * user stack, going down from the original stack pointer:
285 * an ABI gap of 56 words
286 * an mcontext struct
287 * a sigcontext struct
288 * a gap of __SIGNAL_FRAMESIZE bytes
289 *
290 * Each of these things must be a multiple of 16 bytes in size. The following
291 * structure represent all of this except the __SIGNAL_FRAMESIZE gap
292 *
293 */
294struct sigframe {
295 struct sigcontext sctx; /* the sigcontext */
296 struct mcontext mctx; /* all the register values */
297 /*
298 * Programs using the rs6000/xcoff abi can save up to 19 gp
299 * regs and 18 fp regs below sp before decrementing it.
300 */
301 int abigap[56];
302};
303
304/* We use the mc_pad field for the signal return trampoline. */
305#define tramp mc_pad
306
307/*
308 * When we have rt signals to deliver, we set up on the
309 * user stack, going down from the original stack pointer:
310 * one rt_sigframe struct (siginfo + ucontext + ABI gap)
311 * a gap of __SIGNAL_FRAMESIZE+16 bytes
312 * (the +16 is to get the siginfo and ucontext in the same
313 * positions as in older kernels).
314 *
315 * Each of these things must be a multiple of 16 bytes in size.
316 *
317 */
318struct rt_sigframe {
319#ifdef CONFIG_PPC64
320 compat_siginfo_t info;
321#else
322 struct siginfo info;
323#endif
324 struct ucontext uc;
325 /*
326 * Programs using the rs6000/xcoff abi can save up to 19 gp
327 * regs and 18 fp regs below sp before decrementing it.
328 */
329 int abigap[56];
330};
331
332#ifdef CONFIG_VSX
333unsigned long copy_fpr_to_user(void __user *to,
334 struct task_struct *task)
335{
336 double buf[ELF_NFPREG];
337 int i;
338
339 /* save FPR copy to local buffer then write to the thread_struct */
340 for (i = 0; i < (ELF_NFPREG - 1) ; i++)
341 buf[i] = task->thread.TS_FPR(i);
342 memcpy(&buf[i], &task->thread.fpscr, sizeof(double));
343 return __copy_to_user(to, buf, ELF_NFPREG * sizeof(double));
344}
345
346unsigned long copy_fpr_from_user(struct task_struct *task,
347 void __user *from)
348{
349 double buf[ELF_NFPREG];
350 int i;
351
352 if (__copy_from_user(buf, from, ELF_NFPREG * sizeof(double)))
353 return 1;
354 for (i = 0; i < (ELF_NFPREG - 1) ; i++)
355 task->thread.TS_FPR(i) = buf[i];
356 memcpy(&task->thread.fpscr, &buf[i], sizeof(double));
357
358 return 0;
359}
360
361unsigned long copy_vsx_to_user(void __user *to,
362 struct task_struct *task)
363{
364 double buf[ELF_NVSRHALFREG];
365 int i;
366
367 /* save FPR copy to local buffer then write to the thread_struct */
368 for (i = 0; i < ELF_NVSRHALFREG; i++)
369 buf[i] = task->thread.fpr[i][TS_VSRLOWOFFSET];
370 return __copy_to_user(to, buf, ELF_NVSRHALFREG * sizeof(double));
371}
372
373unsigned long copy_vsx_from_user(struct task_struct *task,
374 void __user *from)
375{
376 double buf[ELF_NVSRHALFREG];
377 int i;
378
379 if (__copy_from_user(buf, from, ELF_NVSRHALFREG * sizeof(double)))
380 return 1;
381 for (i = 0; i < ELF_NVSRHALFREG ; i++)
382 task->thread.fpr[i][TS_VSRLOWOFFSET] = buf[i];
383 return 0;
384}
385#else
386inline unsigned long copy_fpr_to_user(void __user *to,
387 struct task_struct *task)
388{
389 return __copy_to_user(to, task->thread.fpr,
390 ELF_NFPREG * sizeof(double));
391}
392
393inline unsigned long copy_fpr_from_user(struct task_struct *task,
394 void __user *from)
395{
396 return __copy_from_user(task->thread.fpr, from,
397 ELF_NFPREG * sizeof(double));
398}
399#endif
400
401/*
402 * Save the current user registers on the user stack.
403 * We only save the altivec/spe registers if the process has used
404 * altivec/spe instructions at some point.
405 */
406static int save_user_regs(struct pt_regs *regs, struct mcontext __user *frame,
407 int sigret, int ctx_has_vsx_region)
408{
409 unsigned long msr = regs->msr;
410
411 /* Make sure floating point registers are stored in regs */
412 flush_fp_to_thread(current);
413
414 /* save general registers */
415 if (save_general_regs(regs, frame))
416 return 1;
417
418#ifdef CONFIG_ALTIVEC
419 /* save altivec registers */
420 if (current->thread.used_vr) {
421 flush_altivec_to_thread(current);
422 if (__copy_to_user(&frame->mc_vregs, current->thread.vr,
423 ELF_NVRREG * sizeof(vector128)))
424 return 1;
425 /* set MSR_VEC in the saved MSR value to indicate that
426 frame->mc_vregs contains valid data */
427 msr |= MSR_VEC;
428 }
429 /* else assert((regs->msr & MSR_VEC) == 0) */
430
431 /* We always copy to/from vrsave, it's 0 if we don't have or don't
432 * use altivec. Since VSCR only contains 32 bits saved in the least
433 * significant bits of a vector, we "cheat" and stuff VRSAVE in the
434 * most significant bits of that same vector. --BenH
435 */
436 if (__put_user(current->thread.vrsave, (u32 __user *)&frame->mc_vregs[32]))
437 return 1;
438#endif /* CONFIG_ALTIVEC */
439 if (copy_fpr_to_user(&frame->mc_fregs, current))
440 return 1;
441#ifdef CONFIG_VSX
442 /*
443 * Copy VSR 0-31 upper half from thread_struct to local
444 * buffer, then write that to userspace. Also set MSR_VSX in
445 * the saved MSR value to indicate that frame->mc_vregs
446 * contains valid data
447 */
448 if (current->thread.used_vsr && ctx_has_vsx_region) {
449 __giveup_vsx(current);
450 if (copy_vsx_to_user(&frame->mc_vsregs, current))
451 return 1;
452 msr |= MSR_VSX;
453 }
454#endif /* CONFIG_VSX */
455#ifdef CONFIG_SPE
456 /* save spe registers */
457 if (current->thread.used_spe) {
458 flush_spe_to_thread(current);
459 if (__copy_to_user(&frame->mc_vregs, current->thread.evr,
460 ELF_NEVRREG * sizeof(u32)))
461 return 1;
462 /* set MSR_SPE in the saved MSR value to indicate that
463 frame->mc_vregs contains valid data */
464 msr |= MSR_SPE;
465 }
466 /* else assert((regs->msr & MSR_SPE) == 0) */
467
468 /* We always copy to/from spefscr */
469 if (__put_user(current->thread.spefscr, (u32 __user *)&frame->mc_vregs + ELF_NEVRREG))
470 return 1;
471#endif /* CONFIG_SPE */
472
473 if (__put_user(msr, &frame->mc_gregs[PT_MSR]))
474 return 1;
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/*
488 * Restore the current user register values from the user stack,
489 * (except for MSR).
490 */
491static long restore_user_regs(struct pt_regs *regs,
492 struct mcontext __user *sr, int sig)
493{
494 long err;
495 unsigned int save_r2 = 0;
496 unsigned long msr;
497#ifdef CONFIG_VSX
498 int i;
499#endif
500
501 /*
502 * restore general registers but not including MSR or SOFTE. Also
503 * take care of keeping r2 (TLS) intact if not a signal
504 */
505 if (!sig)
506 save_r2 = (unsigned int)regs->gpr[2];
507 err = restore_general_regs(regs, sr);
508 regs->trap = 0;
509 err |= __get_user(msr, &sr->mc_gregs[PT_MSR]);
510 if (!sig)
511 regs->gpr[2] = (unsigned long) save_r2;
512 if (err)
513 return 1;
514
515 /* if doing signal return, restore the previous little-endian mode */
516 if (sig)
517 regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE);
518
519 /*
520 * Do this before updating the thread state in
521 * current->thread.fpr/vr/evr. That way, if we get preempted
522 * and another task grabs the FPU/Altivec/SPE, it won't be
523 * tempted to save the current CPU state into the thread_struct
524 * and corrupt what we are writing there.
525 */
526 discard_lazy_cpu_state();
527
528#ifdef CONFIG_ALTIVEC
529 /*
530 * Force the process to reload the altivec registers from
531 * current->thread when it next does altivec instructions
532 */
533 regs->msr &= ~MSR_VEC;
534 if (msr & MSR_VEC) {
535 /* restore altivec registers from the stack */
536 if (__copy_from_user(current->thread.vr, &sr->mc_vregs,
537 sizeof(sr->mc_vregs)))
538 return 1;
539 } else if (current->thread.used_vr)
540 memset(current->thread.vr, 0, ELF_NVRREG * sizeof(vector128));
541
542 /* Always get VRSAVE back */
543 if (__get_user(current->thread.vrsave, (u32 __user *)&sr->mc_vregs[32]))
544 return 1;
545#endif /* CONFIG_ALTIVEC */
546 if (copy_fpr_from_user(current, &sr->mc_fregs))
547 return 1;
548
549#ifdef CONFIG_VSX
550 /*
551 * Force the process to reload the VSX registers from
552 * current->thread when it next does VSX instruction.
553 */
554 regs->msr &= ~MSR_VSX;
555 if (msr & MSR_VSX) {
556 /*
557 * Restore altivec registers from the stack to a local
558 * buffer, then write this out to the thread_struct
559 */
560 if (copy_vsx_from_user(current, &sr->mc_vsregs))
561 return 1;
562 } else if (current->thread.used_vsr)
563 for (i = 0; i < 32 ; i++)
564 current->thread.fpr[i][TS_VSRLOWOFFSET] = 0;
565#endif /* CONFIG_VSX */
566 /*
567 * force the process to reload the FP registers from
568 * current->thread when it next does FP instructions
569 */
570 regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1);
571
572#ifdef CONFIG_SPE
573 /* force the process to reload the spe registers from
574 current->thread when it next does spe instructions */
575 regs->msr &= ~MSR_SPE;
576 if (msr & MSR_SPE) {
577 /* restore spe registers from the stack */
578 if (__copy_from_user(current->thread.evr, &sr->mc_vregs,
579 ELF_NEVRREG * sizeof(u32)))
580 return 1;
581 } else if (current->thread.used_spe)
582 memset(current->thread.evr, 0, ELF_NEVRREG * sizeof(u32));
583
584 /* Always get SPEFSCR back */
585 if (__get_user(current->thread.spefscr, (u32 __user *)&sr->mc_vregs + ELF_NEVRREG))
586 return 1;
587#endif /* CONFIG_SPE */
588
589 return 0;
590}
591
592#ifdef CONFIG_PPC64
593long compat_sys_rt_sigaction(int sig, const struct sigaction32 __user *act,
594 struct sigaction32 __user *oact, size_t sigsetsize)
595{
596 struct k_sigaction new_ka, old_ka;
597 int ret;
598
599 /* XXX: Don't preclude handling different sized sigset_t's. */
600 if (sigsetsize != sizeof(compat_sigset_t))
601 return -EINVAL;
602
603 if (act) {
604 compat_uptr_t handler;
605
606 ret = get_user(handler, &act->sa_handler);
607 new_ka.sa.sa_handler = compat_ptr(handler);
608 ret |= get_sigset_t(&new_ka.sa.sa_mask, &act->sa_mask);
609 ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
610 if (ret)
611 return -EFAULT;
612 }
613
614 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
615 if (!ret && oact) {
616 ret = put_user(to_user_ptr(old_ka.sa.sa_handler), &oact->sa_handler);
617 ret |= put_sigset_t(&oact->sa_mask, &old_ka.sa.sa_mask);
618 ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
619 }
620 return ret;
621}
622
623/*
624 * Note: it is necessary to treat how as an unsigned int, with the
625 * corresponding cast to a signed int to insure that the proper
626 * conversion (sign extension) between the register representation
627 * of a signed int (msr in 32-bit mode) and the register representation
628 * of a signed int (msr in 64-bit mode) is performed.
629 */
630long compat_sys_rt_sigprocmask(u32 how, compat_sigset_t __user *set,
631 compat_sigset_t __user *oset, size_t sigsetsize)
632{
633 sigset_t s;
634 sigset_t __user *up;
635 int ret;
636 mm_segment_t old_fs = get_fs();
637
638 if (set) {
639 if (get_sigset_t(&s, set))
640 return -EFAULT;
641 }
642
643 set_fs(KERNEL_DS);
644 /* This is valid because of the set_fs() */
645 up = (sigset_t __user *) &s;
646 ret = sys_rt_sigprocmask((int)how, set ? up : NULL, oset ? up : NULL,
647 sigsetsize);
648 set_fs(old_fs);
649 if (ret)
650 return ret;
651 if (oset) {
652 if (put_sigset_t(oset, &s))
653 return -EFAULT;
654 }
655 return 0;
656}
657
658long compat_sys_rt_sigpending(compat_sigset_t __user *set, compat_size_t sigsetsize)
659{
660 sigset_t s;
661 int ret;
662 mm_segment_t old_fs = get_fs();
663
664 set_fs(KERNEL_DS);
665 /* The __user pointer cast is valid because of the set_fs() */
666 ret = sys_rt_sigpending((sigset_t __user *) &s, sigsetsize);
667 set_fs(old_fs);
668 if (!ret) {
669 if (put_sigset_t(set, &s))
670 return -EFAULT;
671 }
672 return ret;
673}
674
675
676int copy_siginfo_to_user32(struct compat_siginfo __user *d, siginfo_t *s)
677{
678 int err;
679
680 if (!access_ok (VERIFY_WRITE, d, sizeof(*d)))
681 return -EFAULT;
682
683 /* If you change siginfo_t structure, please be sure
684 * this code is fixed accordingly.
685 * It should never copy any pad contained in the structure
686 * to avoid security leaks, but must copy the generic
687 * 3 ints plus the relevant union member.
688 * This routine must convert siginfo from 64bit to 32bit as well
689 * at the same time.
690 */
691 err = __put_user(s->si_signo, &d->si_signo);
692 err |= __put_user(s->si_errno, &d->si_errno);
693 err |= __put_user((short)s->si_code, &d->si_code);
694 if (s->si_code < 0)
695 err |= __copy_to_user(&d->_sifields._pad, &s->_sifields._pad,
696 SI_PAD_SIZE32);
697 else switch(s->si_code >> 16) {
698 case __SI_CHLD >> 16:
699 err |= __put_user(s->si_pid, &d->si_pid);
700 err |= __put_user(s->si_uid, &d->si_uid);
701 err |= __put_user(s->si_utime, &d->si_utime);
702 err |= __put_user(s->si_stime, &d->si_stime);
703 err |= __put_user(s->si_status, &d->si_status);
704 break;
705 case __SI_FAULT >> 16:
706 err |= __put_user((unsigned int)(unsigned long)s->si_addr,
707 &d->si_addr);
708 break;
709 case __SI_POLL >> 16:
710 err |= __put_user(s->si_band, &d->si_band);
711 err |= __put_user(s->si_fd, &d->si_fd);
712 break;
713 case __SI_TIMER >> 16:
714 err |= __put_user(s->si_tid, &d->si_tid);
715 err |= __put_user(s->si_overrun, &d->si_overrun);
716 err |= __put_user(s->si_int, &d->si_int);
717 break;
718 case __SI_RT >> 16: /* This is not generated by the kernel as of now. */
719 case __SI_MESGQ >> 16:
720 err |= __put_user(s->si_int, &d->si_int);
721 /* fallthrough */
722 case __SI_KILL >> 16:
723 default:
724 err |= __put_user(s->si_pid, &d->si_pid);
725 err |= __put_user(s->si_uid, &d->si_uid);
726 break;
727 }
728 return err;
729}
730
731#define copy_siginfo_to_user copy_siginfo_to_user32
732
733int copy_siginfo_from_user32(siginfo_t *to, struct compat_siginfo __user *from)
734{
735 memset(to, 0, sizeof *to);
736
737 if (copy_from_user(to, from, 3*sizeof(int)) ||
738 copy_from_user(to->_sifields._pad,
739 from->_sifields._pad, SI_PAD_SIZE32))
740 return -EFAULT;
741
742 return 0;
743}
744
745/*
746 * Note: it is necessary to treat pid and sig as unsigned ints, with the
747 * corresponding cast to a signed int to insure that the proper conversion
748 * (sign extension) between the register representation of a signed int
749 * (msr in 32-bit mode) and the register representation of a signed int
750 * (msr in 64-bit mode) is performed.
751 */
752long compat_sys_rt_sigqueueinfo(u32 pid, u32 sig, compat_siginfo_t __user *uinfo)
753{
754 siginfo_t info;
755 int ret;
756 mm_segment_t old_fs = get_fs();
757
758 ret = copy_siginfo_from_user32(&info, uinfo);
759 if (unlikely(ret))
760 return ret;
761
762 set_fs (KERNEL_DS);
763 /* The __user pointer cast is valid becasuse of the set_fs() */
764 ret = sys_rt_sigqueueinfo((int)pid, (int)sig, (siginfo_t __user *) &info);
765 set_fs (old_fs);
766 return ret;
767}
768/*
769 * Start Alternate signal stack support
770 *
771 * System Calls
772 * sigaltatck compat_sys_sigaltstack
773 */
774
775int compat_sys_sigaltstack(u32 __new, u32 __old, int r5,
776 int r6, int r7, int r8, struct pt_regs *regs)
777{
778 stack_32_t __user * newstack = compat_ptr(__new);
779 stack_32_t __user * oldstack = compat_ptr(__old);
780 stack_t uss, uoss;
781 int ret;
782 mm_segment_t old_fs;
783 unsigned long sp;
784 compat_uptr_t ss_sp;
785
786 /*
787 * set sp to the user stack on entry to the system call
788 * the system call router sets R9 to the saved registers
789 */
790 sp = regs->gpr[1];
791
792 /* Put new stack info in local 64 bit stack struct */
793 if (newstack) {
794 if (get_user(ss_sp, &newstack->ss_sp) ||
795 __get_user(uss.ss_flags, &newstack->ss_flags) ||
796 __get_user(uss.ss_size, &newstack->ss_size))
797 return -EFAULT;
798 uss.ss_sp = compat_ptr(ss_sp);
799 }
800
801 old_fs = get_fs();
802 set_fs(KERNEL_DS);
803 /* The __user pointer casts are valid because of the set_fs() */
804 ret = do_sigaltstack(
805 newstack ? (stack_t __user *) &uss : NULL,
806 oldstack ? (stack_t __user *) &uoss : NULL,
807 sp);
808 set_fs(old_fs);
809 /* Copy the stack information to the user output buffer */
810 if (!ret && oldstack &&
811 (put_user(ptr_to_compat(uoss.ss_sp), &oldstack->ss_sp) ||
812 __put_user(uoss.ss_flags, &oldstack->ss_flags) ||
813 __put_user(uoss.ss_size, &oldstack->ss_size)))
814 return -EFAULT;
815 return ret;
816}
817#endif /* CONFIG_PPC64 */
818
819/*
820 * Set up a signal frame for a "real-time" signal handler
821 * (one which gets siginfo).
822 */
823int handle_rt_signal32(unsigned long sig, struct k_sigaction *ka,
824 siginfo_t *info, sigset_t *oldset,
825 struct pt_regs *regs)
826{
827 struct rt_sigframe __user *rt_sf;
828 struct mcontext __user *frame;
829 void __user *addr;
830 unsigned long newsp = 0;
831
832 /* Set up Signal Frame */
833 /* Put a Real Time Context onto stack */
834 rt_sf = get_sigframe(ka, regs, sizeof(*rt_sf), 1);
835 addr = rt_sf;
836 if (unlikely(rt_sf == NULL))
837 goto badframe;
838
839 /* Put the siginfo & fill in most of the ucontext */
840 if (copy_siginfo_to_user(&rt_sf->info, info)
841 || __put_user(0, &rt_sf->uc.uc_flags)
842 || __put_user(0, &rt_sf->uc.uc_link)
843 || __put_user(current->sas_ss_sp, &rt_sf->uc.uc_stack.ss_sp)
844 || __put_user(sas_ss_flags(regs->gpr[1]),
845 &rt_sf->uc.uc_stack.ss_flags)
846 || __put_user(current->sas_ss_size, &rt_sf->uc.uc_stack.ss_size)
847 || __put_user(to_user_ptr(&rt_sf->uc.uc_mcontext),
848 &rt_sf->uc.uc_regs)
849 || put_sigset_t(&rt_sf->uc.uc_sigmask, oldset))
850 goto badframe;
851
852 /* Save user registers on the stack */
853 frame = &rt_sf->uc.uc_mcontext;
854 addr = frame;
855 if (vdso32_rt_sigtramp && current->mm->context.vdso_base) {
856 if (save_user_regs(regs, frame, 0, 1))
857 goto badframe;
858 regs->link = current->mm->context.vdso_base + vdso32_rt_sigtramp;
859 } else {
860 if (save_user_regs(regs, frame, __NR_rt_sigreturn, 1))
861 goto badframe;
862 regs->link = (unsigned long) frame->tramp;
863 }
864
865 current->thread.fpscr.val = 0; /* turn off all fp exceptions */
866
867 /* create a stack frame for the caller of the handler */
868 newsp = ((unsigned long)rt_sf) - (__SIGNAL_FRAMESIZE + 16);
869 addr = (void __user *)regs->gpr[1];
870 if (put_user(regs->gpr[1], (u32 __user *)newsp))
871 goto badframe;
872
873 /* Fill registers for signal handler */
874 regs->gpr[1] = newsp;
875 regs->gpr[3] = sig;
876 regs->gpr[4] = (unsigned long) &rt_sf->info;
877 regs->gpr[5] = (unsigned long) &rt_sf->uc;
878 regs->gpr[6] = (unsigned long) rt_sf;
879 regs->nip = (unsigned long) ka->sa.sa_handler;
880 /* enter the signal handler in big-endian mode */
881 regs->msr &= ~MSR_LE;
882 return 1;
883
884badframe:
885#ifdef DEBUG_SIG
886 printk("badframe in handle_rt_signal, regs=%p frame=%p newsp=%lx\n",
887 regs, frame, newsp);
888#endif
889 if (show_unhandled_signals)
890 printk_ratelimited(KERN_INFO
891 "%s[%d]: bad frame in handle_rt_signal32: "
892 "%p nip %08lx lr %08lx\n",
893 current->comm, current->pid,
894 addr, regs->nip, regs->link);
895
896 force_sigsegv(sig, current);
897 return 0;
898}
899
900static int do_setcontext(struct ucontext __user *ucp, struct pt_regs *regs, int sig)
901{
902 sigset_t set;
903 struct mcontext __user *mcp;
904
905 if (get_sigset_t(&set, &ucp->uc_sigmask))
906 return -EFAULT;
907#ifdef CONFIG_PPC64
908 {
909 u32 cmcp;
910
911 if (__get_user(cmcp, &ucp->uc_regs))
912 return -EFAULT;
913 mcp = (struct mcontext __user *)(u64)cmcp;
914 /* no need to check access_ok(mcp), since mcp < 4GB */
915 }
916#else
917 if (__get_user(mcp, &ucp->uc_regs))
918 return -EFAULT;
919 if (!access_ok(VERIFY_READ, mcp, sizeof(*mcp)))
920 return -EFAULT;
921#endif
922 set_current_blocked(&set);
923 if (restore_user_regs(regs, mcp, sig))
924 return -EFAULT;
925
926 return 0;
927}
928
929long sys_swapcontext(struct ucontext __user *old_ctx,
930 struct ucontext __user *new_ctx,
931 int ctx_size, int r6, int r7, int r8, struct pt_regs *regs)
932{
933 unsigned char tmp;
934 int ctx_has_vsx_region = 0;
935
936#ifdef CONFIG_PPC64
937 unsigned long new_msr = 0;
938
939 if (new_ctx) {
940 struct mcontext __user *mcp;
941 u32 cmcp;
942
943 /*
944 * Get pointer to the real mcontext. No need for
945 * access_ok since we are dealing with compat
946 * pointers.
947 */
948 if (__get_user(cmcp, &new_ctx->uc_regs))
949 return -EFAULT;
950 mcp = (struct mcontext __user *)(u64)cmcp;
951 if (__get_user(new_msr, &mcp->mc_gregs[PT_MSR]))
952 return -EFAULT;
953 }
954 /*
955 * Check that the context is not smaller than the original
956 * size (with VMX but without VSX)
957 */
958 if (ctx_size < UCONTEXTSIZEWITHOUTVSX)
959 return -EINVAL;
960 /*
961 * If the new context state sets the MSR VSX bits but
962 * it doesn't provide VSX state.
963 */
964 if ((ctx_size < sizeof(struct ucontext)) &&
965 (new_msr & MSR_VSX))
966 return -EINVAL;
967 /* Does the context have enough room to store VSX data? */
968 if (ctx_size >= sizeof(struct ucontext))
969 ctx_has_vsx_region = 1;
970#else
971 /* Context size is for future use. Right now, we only make sure
972 * we are passed something we understand
973 */
974 if (ctx_size < sizeof(struct ucontext))
975 return -EINVAL;
976#endif
977 if (old_ctx != NULL) {
978 struct mcontext __user *mctx;
979
980 /*
981 * old_ctx might not be 16-byte aligned, in which
982 * case old_ctx->uc_mcontext won't be either.
983 * Because we have the old_ctx->uc_pad2 field
984 * before old_ctx->uc_mcontext, we need to round down
985 * from &old_ctx->uc_mcontext to a 16-byte boundary.
986 */
987 mctx = (struct mcontext __user *)
988 ((unsigned long) &old_ctx->uc_mcontext & ~0xfUL);
989 if (!access_ok(VERIFY_WRITE, old_ctx, ctx_size)
990 || save_user_regs(regs, mctx, 0, ctx_has_vsx_region)
991 || put_sigset_t(&old_ctx->uc_sigmask, ¤t->blocked)
992 || __put_user(to_user_ptr(mctx), &old_ctx->uc_regs))
993 return -EFAULT;
994 }
995 if (new_ctx == NULL)
996 return 0;
997 if (!access_ok(VERIFY_READ, new_ctx, ctx_size)
998 || __get_user(tmp, (u8 __user *) new_ctx)
999 || __get_user(tmp, (u8 __user *) new_ctx + ctx_size - 1))
1000 return -EFAULT;
1001
1002 /*
1003 * If we get a fault copying the context into the kernel's
1004 * image of the user's registers, we can't just return -EFAULT
1005 * because the user's registers will be corrupted. For instance
1006 * the NIP value may have been updated but not some of the
1007 * other registers. Given that we have done the access_ok
1008 * and successfully read the first and last bytes of the region
1009 * above, this should only happen in an out-of-memory situation
1010 * or if another thread unmaps the region containing the context.
1011 * We kill the task with a SIGSEGV in this situation.
1012 */
1013 if (do_setcontext(new_ctx, regs, 0))
1014 do_exit(SIGSEGV);
1015
1016 set_thread_flag(TIF_RESTOREALL);
1017 return 0;
1018}
1019
1020long sys_rt_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8,
1021 struct pt_regs *regs)
1022{
1023 struct rt_sigframe __user *rt_sf;
1024
1025 /* Always make any pending restarted system calls return -EINTR */
1026 current_thread_info()->restart_block.fn = do_no_restart_syscall;
1027
1028 rt_sf = (struct rt_sigframe __user *)
1029 (regs->gpr[1] + __SIGNAL_FRAMESIZE + 16);
1030 if (!access_ok(VERIFY_READ, rt_sf, sizeof(*rt_sf)))
1031 goto bad;
1032 if (do_setcontext(&rt_sf->uc, regs, 1))
1033 goto bad;
1034
1035 /*
1036 * It's not clear whether or why it is desirable to save the
1037 * sigaltstack setting on signal delivery and restore it on
1038 * signal return. But other architectures do this and we have
1039 * always done it up until now so it is probably better not to
1040 * change it. -- paulus
1041 */
1042#ifdef CONFIG_PPC64
1043 /*
1044 * We use the compat_sys_ version that does the 32/64 bits conversion
1045 * and takes userland pointer directly. What about error checking ?
1046 * nobody does any...
1047 */
1048 compat_sys_sigaltstack((u32)(u64)&rt_sf->uc.uc_stack, 0, 0, 0, 0, 0, regs);
1049#else
1050 do_sigaltstack(&rt_sf->uc.uc_stack, NULL, regs->gpr[1]);
1051#endif
1052 set_thread_flag(TIF_RESTOREALL);
1053 return 0;
1054
1055 bad:
1056 if (show_unhandled_signals)
1057 printk_ratelimited(KERN_INFO
1058 "%s[%d]: bad frame in sys_rt_sigreturn: "
1059 "%p nip %08lx lr %08lx\n",
1060 current->comm, current->pid,
1061 rt_sf, regs->nip, regs->link);
1062
1063 force_sig(SIGSEGV, current);
1064 return 0;
1065}
1066
1067#ifdef CONFIG_PPC32
1068int sys_debug_setcontext(struct ucontext __user *ctx,
1069 int ndbg, struct sig_dbg_op __user *dbg,
1070 int r6, int r7, int r8,
1071 struct pt_regs *regs)
1072{
1073 struct sig_dbg_op op;
1074 int i;
1075 unsigned char tmp;
1076 unsigned long new_msr = regs->msr;
1077#ifdef CONFIG_PPC_ADV_DEBUG_REGS
1078 unsigned long new_dbcr0 = current->thread.dbcr0;
1079#endif
1080
1081 for (i=0; i<ndbg; i++) {
1082 if (copy_from_user(&op, dbg + i, sizeof(op)))
1083 return -EFAULT;
1084 switch (op.dbg_type) {
1085 case SIG_DBG_SINGLE_STEPPING:
1086#ifdef CONFIG_PPC_ADV_DEBUG_REGS
1087 if (op.dbg_value) {
1088 new_msr |= MSR_DE;
1089 new_dbcr0 |= (DBCR0_IDM | DBCR0_IC);
1090 } else {
1091 new_dbcr0 &= ~DBCR0_IC;
1092 if (!DBCR_ACTIVE_EVENTS(new_dbcr0,
1093 current->thread.dbcr1)) {
1094 new_msr &= ~MSR_DE;
1095 new_dbcr0 &= ~DBCR0_IDM;
1096 }
1097 }
1098#else
1099 if (op.dbg_value)
1100 new_msr |= MSR_SE;
1101 else
1102 new_msr &= ~MSR_SE;
1103#endif
1104 break;
1105 case SIG_DBG_BRANCH_TRACING:
1106#ifdef CONFIG_PPC_ADV_DEBUG_REGS
1107 return -EINVAL;
1108#else
1109 if (op.dbg_value)
1110 new_msr |= MSR_BE;
1111 else
1112 new_msr &= ~MSR_BE;
1113#endif
1114 break;
1115
1116 default:
1117 return -EINVAL;
1118 }
1119 }
1120
1121 /* We wait until here to actually install the values in the
1122 registers so if we fail in the above loop, it will not
1123 affect the contents of these registers. After this point,
1124 failure is a problem, anyway, and it's very unlikely unless
1125 the user is really doing something wrong. */
1126 regs->msr = new_msr;
1127#ifdef CONFIG_PPC_ADV_DEBUG_REGS
1128 current->thread.dbcr0 = new_dbcr0;
1129#endif
1130
1131 if (!access_ok(VERIFY_READ, ctx, sizeof(*ctx))
1132 || __get_user(tmp, (u8 __user *) ctx)
1133 || __get_user(tmp, (u8 __user *) (ctx + 1) - 1))
1134 return -EFAULT;
1135
1136 /*
1137 * If we get a fault copying the context into the kernel's
1138 * image of the user's registers, we can't just return -EFAULT
1139 * because the user's registers will be corrupted. For instance
1140 * the NIP value may have been updated but not some of the
1141 * other registers. Given that we have done the access_ok
1142 * and successfully read the first and last bytes of the region
1143 * above, this should only happen in an out-of-memory situation
1144 * or if another thread unmaps the region containing the context.
1145 * We kill the task with a SIGSEGV in this situation.
1146 */
1147 if (do_setcontext(ctx, regs, 1)) {
1148 if (show_unhandled_signals)
1149 printk_ratelimited(KERN_INFO "%s[%d]: bad frame in "
1150 "sys_debug_setcontext: %p nip %08lx "
1151 "lr %08lx\n",
1152 current->comm, current->pid,
1153 ctx, regs->nip, regs->link);
1154
1155 force_sig(SIGSEGV, current);
1156 goto out;
1157 }
1158
1159 /*
1160 * It's not clear whether or why it is desirable to save the
1161 * sigaltstack setting on signal delivery and restore it on
1162 * signal return. But other architectures do this and we have
1163 * always done it up until now so it is probably better not to
1164 * change it. -- paulus
1165 */
1166 do_sigaltstack(&ctx->uc_stack, NULL, regs->gpr[1]);
1167
1168 set_thread_flag(TIF_RESTOREALL);
1169 out:
1170 return 0;
1171}
1172#endif
1173
1174/*
1175 * OK, we're invoking a handler
1176 */
1177int handle_signal32(unsigned long sig, struct k_sigaction *ka,
1178 siginfo_t *info, sigset_t *oldset, struct pt_regs *regs)
1179{
1180 struct sigcontext __user *sc;
1181 struct sigframe __user *frame;
1182 unsigned long newsp = 0;
1183
1184 /* Set up Signal Frame */
1185 frame = get_sigframe(ka, regs, sizeof(*frame), 1);
1186 if (unlikely(frame == NULL))
1187 goto badframe;
1188 sc = (struct sigcontext __user *) &frame->sctx;
1189
1190#if _NSIG != 64
1191#error "Please adjust handle_signal()"
1192#endif
1193 if (__put_user(to_user_ptr(ka->sa.sa_handler), &sc->handler)
1194 || __put_user(oldset->sig[0], &sc->oldmask)
1195#ifdef CONFIG_PPC64
1196 || __put_user((oldset->sig[0] >> 32), &sc->_unused[3])
1197#else
1198 || __put_user(oldset->sig[1], &sc->_unused[3])
1199#endif
1200 || __put_user(to_user_ptr(&frame->mctx), &sc->regs)
1201 || __put_user(sig, &sc->signal))
1202 goto badframe;
1203
1204 if (vdso32_sigtramp && current->mm->context.vdso_base) {
1205 if (save_user_regs(regs, &frame->mctx, 0, 1))
1206 goto badframe;
1207 regs->link = current->mm->context.vdso_base + vdso32_sigtramp;
1208 } else {
1209 if (save_user_regs(regs, &frame->mctx, __NR_sigreturn, 1))
1210 goto badframe;
1211 regs->link = (unsigned long) frame->mctx.tramp;
1212 }
1213
1214 current->thread.fpscr.val = 0; /* turn off all fp exceptions */
1215
1216 /* create a stack frame for the caller of the handler */
1217 newsp = ((unsigned long)frame) - __SIGNAL_FRAMESIZE;
1218 if (put_user(regs->gpr[1], (u32 __user *)newsp))
1219 goto badframe;
1220
1221 regs->gpr[1] = newsp;
1222 regs->gpr[3] = sig;
1223 regs->gpr[4] = (unsigned long) sc;
1224 regs->nip = (unsigned long) ka->sa.sa_handler;
1225 /* enter the signal handler in big-endian mode */
1226 regs->msr &= ~MSR_LE;
1227
1228 return 1;
1229
1230badframe:
1231#ifdef DEBUG_SIG
1232 printk("badframe in handle_signal, regs=%p frame=%p newsp=%lx\n",
1233 regs, frame, newsp);
1234#endif
1235 if (show_unhandled_signals)
1236 printk_ratelimited(KERN_INFO
1237 "%s[%d]: bad frame in handle_signal32: "
1238 "%p nip %08lx lr %08lx\n",
1239 current->comm, current->pid,
1240 frame, regs->nip, regs->link);
1241
1242 force_sigsegv(sig, current);
1243 return 0;
1244}
1245
1246/*
1247 * Do a signal return; undo the signal stack.
1248 */
1249long sys_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8,
1250 struct pt_regs *regs)
1251{
1252 struct sigcontext __user *sc;
1253 struct sigcontext sigctx;
1254 struct mcontext __user *sr;
1255 void __user *addr;
1256 sigset_t set;
1257
1258 /* Always make any pending restarted system calls return -EINTR */
1259 current_thread_info()->restart_block.fn = do_no_restart_syscall;
1260
1261 sc = (struct sigcontext __user *)(regs->gpr[1] + __SIGNAL_FRAMESIZE);
1262 addr = sc;
1263 if (copy_from_user(&sigctx, sc, sizeof(sigctx)))
1264 goto badframe;
1265
1266#ifdef CONFIG_PPC64
1267 /*
1268 * Note that PPC32 puts the upper 32 bits of the sigmask in the
1269 * unused part of the signal stackframe
1270 */
1271 set.sig[0] = sigctx.oldmask + ((long)(sigctx._unused[3]) << 32);
1272#else
1273 set.sig[0] = sigctx.oldmask;
1274 set.sig[1] = sigctx._unused[3];
1275#endif
1276 set_current_blocked(&set);
1277
1278 sr = (struct mcontext __user *)from_user_ptr(sigctx.regs);
1279 addr = sr;
1280 if (!access_ok(VERIFY_READ, sr, sizeof(*sr))
1281 || restore_user_regs(regs, sr, 1))
1282 goto badframe;
1283
1284 set_thread_flag(TIF_RESTOREALL);
1285 return 0;
1286
1287badframe:
1288 if (show_unhandled_signals)
1289 printk_ratelimited(KERN_INFO
1290 "%s[%d]: bad frame in sys_sigreturn: "
1291 "%p nip %08lx lr %08lx\n",
1292 current->comm, current->pid,
1293 addr, regs->nip, regs->link);
1294
1295 force_sig(SIGSEGV, current);
1296 return 0;
1297}