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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#ifdef CONFIG_PPC64
47#include "ppc32.h"
48#include <asm/unistd.h>
49#else
50#include <asm/ucontext.h>
51#include <asm/pgtable.h>
52#endif
53
54#include "signal.h"
55
56#undef DEBUG_SIG
57
58#ifdef CONFIG_PPC64
59#define sys_sigsuspend compat_sys_sigsuspend
60#define sys_rt_sigsuspend compat_sys_rt_sigsuspend
61#define sys_rt_sigreturn compat_sys_rt_sigreturn
62#define sys_sigaction compat_sys_sigaction
63#define sys_swapcontext compat_sys_swapcontext
64#define sys_sigreturn compat_sys_sigreturn
65
66#define old_sigaction old_sigaction32
67#define sigcontext sigcontext32
68#define mcontext mcontext32
69#define ucontext ucontext32
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[5] = 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
133static inline int get_old_sigaction(struct k_sigaction *new_ka,
134 struct old_sigaction __user *act)
135{
136 compat_old_sigset_t mask;
137 compat_uptr_t handler, restorer;
138
139 if (get_user(handler, &act->sa_handler) ||
140 __get_user(restorer, &act->sa_restorer) ||
141 __get_user(new_ka->sa.sa_flags, &act->sa_flags) ||
142 __get_user(mask, &act->sa_mask))
143 return -EFAULT;
144 new_ka->sa.sa_handler = compat_ptr(handler);
145 new_ka->sa.sa_restorer = compat_ptr(restorer);
146 siginitset(&new_ka->sa.sa_mask, mask);
147 return 0;
148}
149
150#define to_user_ptr(p) ptr_to_compat(p)
151#define from_user_ptr(p) compat_ptr(p)
152
153static inline int save_general_regs(struct pt_regs *regs,
154 struct mcontext __user *frame)
155{
156 elf_greg_t64 *gregs = (elf_greg_t64 *)regs;
157 int i;
158
159 WARN_ON(!FULL_REGS(regs));
160
161 for (i = 0; i <= PT_RESULT; i ++) {
162 if (i == 14 && !FULL_REGS(regs))
163 i = 32;
164 if (__put_user((unsigned int)gregs[i], &frame->mc_gregs[i]))
165 return -EFAULT;
166 }
167 return 0;
168}
169
170static inline int restore_general_regs(struct pt_regs *regs,
171 struct mcontext __user *sr)
172{
173 elf_greg_t64 *gregs = (elf_greg_t64 *)regs;
174 int i;
175
176 for (i = 0; i <= PT_RESULT; i++) {
177 if ((i == PT_MSR) || (i == PT_SOFTE))
178 continue;
179 if (__get_user(gregs[i], &sr->mc_gregs[i]))
180 return -EFAULT;
181 }
182 return 0;
183}
184
185#else /* CONFIG_PPC64 */
186
187#define GP_REGS_SIZE min(sizeof(elf_gregset_t), sizeof(struct pt_regs))
188
189static inline int put_sigset_t(sigset_t __user *uset, sigset_t *set)
190{
191 return copy_to_user(uset, set, sizeof(*uset));
192}
193
194static inline int get_sigset_t(sigset_t *set, const sigset_t __user *uset)
195{
196 return copy_from_user(set, uset, sizeof(*uset));
197}
198
199static inline int get_old_sigaction(struct k_sigaction *new_ka,
200 struct old_sigaction __user *act)
201{
202 old_sigset_t mask;
203
204 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
205 __get_user(new_ka->sa.sa_handler, &act->sa_handler) ||
206 __get_user(new_ka->sa.sa_restorer, &act->sa_restorer))
207 return -EFAULT;
208 __get_user(new_ka->sa.sa_flags, &act->sa_flags);
209 __get_user(mask, &act->sa_mask);
210 siginitset(&new_ka->sa.sa_mask, mask);
211 return 0;
212}
213
214#define to_user_ptr(p) ((unsigned long)(p))
215#define from_user_ptr(p) ((void __user *)(p))
216
217static inline int save_general_regs(struct pt_regs *regs,
218 struct mcontext __user *frame)
219{
220 WARN_ON(!FULL_REGS(regs));
221 return __copy_to_user(&frame->mc_gregs, regs, GP_REGS_SIZE);
222}
223
224static inline int restore_general_regs(struct pt_regs *regs,
225 struct mcontext __user *sr)
226{
227 /* copy up to but not including MSR */
228 if (__copy_from_user(regs, &sr->mc_gregs,
229 PT_MSR * sizeof(elf_greg_t)))
230 return -EFAULT;
231 /* copy from orig_r3 (the word after the MSR) up to the end */
232 if (__copy_from_user(®s->orig_gpr3, &sr->mc_gregs[PT_ORIG_R3],
233 GP_REGS_SIZE - PT_ORIG_R3 * sizeof(elf_greg_t)))
234 return -EFAULT;
235 return 0;
236}
237
238#endif /* CONFIG_PPC64 */
239
240/*
241 * Atomically swap in the new signal mask, and wait for a signal.
242 */
243long sys_sigsuspend(old_sigset_t mask)
244{
245 mask &= _BLOCKABLE;
246 spin_lock_irq(¤t->sighand->siglock);
247 current->saved_sigmask = current->blocked;
248 siginitset(¤t->blocked, mask);
249 recalc_sigpending();
250 spin_unlock_irq(¤t->sighand->siglock);
251
252 current->state = TASK_INTERRUPTIBLE;
253 schedule();
254 set_restore_sigmask();
255 return -ERESTARTNOHAND;
256}
257
258long sys_sigaction(int sig, struct old_sigaction __user *act,
259 struct old_sigaction __user *oact)
260{
261 struct k_sigaction new_ka, old_ka;
262 int ret;
263
264#ifdef CONFIG_PPC64
265 if (sig < 0)
266 sig = -sig;
267#endif
268
269 if (act) {
270 if (get_old_sigaction(&new_ka, act))
271 return -EFAULT;
272 }
273
274 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
275 if (!ret && oact) {
276 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
277 __put_user(to_user_ptr(old_ka.sa.sa_handler),
278 &oact->sa_handler) ||
279 __put_user(to_user_ptr(old_ka.sa.sa_restorer),
280 &oact->sa_restorer) ||
281 __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
282 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
283 return -EFAULT;
284 }
285
286 return ret;
287}
288
289/*
290 * When we have signals to deliver, we set up on the
291 * user stack, going down from the original stack pointer:
292 * an ABI gap of 56 words
293 * an mcontext struct
294 * a sigcontext struct
295 * a gap of __SIGNAL_FRAMESIZE bytes
296 *
297 * Each of these things must be a multiple of 16 bytes in size. The following
298 * structure represent all of this except the __SIGNAL_FRAMESIZE gap
299 *
300 */
301struct sigframe {
302 struct sigcontext sctx; /* the sigcontext */
303 struct mcontext mctx; /* all the register values */
304 /*
305 * Programs using the rs6000/xcoff abi can save up to 19 gp
306 * regs and 18 fp regs below sp before decrementing it.
307 */
308 int abigap[56];
309};
310
311/* We use the mc_pad field for the signal return trampoline. */
312#define tramp mc_pad
313
314/*
315 * When we have rt signals to deliver, we set up on the
316 * user stack, going down from the original stack pointer:
317 * one rt_sigframe struct (siginfo + ucontext + ABI gap)
318 * a gap of __SIGNAL_FRAMESIZE+16 bytes
319 * (the +16 is to get the siginfo and ucontext in the same
320 * positions as in older kernels).
321 *
322 * Each of these things must be a multiple of 16 bytes in size.
323 *
324 */
325struct rt_sigframe {
326#ifdef CONFIG_PPC64
327 compat_siginfo_t info;
328#else
329 struct siginfo info;
330#endif
331 struct ucontext uc;
332 /*
333 * Programs using the rs6000/xcoff abi can save up to 19 gp
334 * regs and 18 fp regs below sp before decrementing it.
335 */
336 int abigap[56];
337};
338
339#ifdef CONFIG_VSX
340unsigned long copy_fpr_to_user(void __user *to,
341 struct task_struct *task)
342{
343 double buf[ELF_NFPREG];
344 int i;
345
346 /* save FPR copy to local buffer then write to the thread_struct */
347 for (i = 0; i < (ELF_NFPREG - 1) ; i++)
348 buf[i] = task->thread.TS_FPR(i);
349 memcpy(&buf[i], &task->thread.fpscr, sizeof(double));
350 return __copy_to_user(to, buf, ELF_NFPREG * sizeof(double));
351}
352
353unsigned long copy_fpr_from_user(struct task_struct *task,
354 void __user *from)
355{
356 double buf[ELF_NFPREG];
357 int i;
358
359 if (__copy_from_user(buf, from, ELF_NFPREG * sizeof(double)))
360 return 1;
361 for (i = 0; i < (ELF_NFPREG - 1) ; i++)
362 task->thread.TS_FPR(i) = buf[i];
363 memcpy(&task->thread.fpscr, &buf[i], sizeof(double));
364
365 return 0;
366}
367
368unsigned long copy_vsx_to_user(void __user *to,
369 struct task_struct *task)
370{
371 double buf[ELF_NVSRHALFREG];
372 int i;
373
374 /* save FPR copy to local buffer then write to the thread_struct */
375 for (i = 0; i < ELF_NVSRHALFREG; i++)
376 buf[i] = task->thread.fpr[i][TS_VSRLOWOFFSET];
377 return __copy_to_user(to, buf, ELF_NVSRHALFREG * sizeof(double));
378}
379
380unsigned long copy_vsx_from_user(struct task_struct *task,
381 void __user *from)
382{
383 double buf[ELF_NVSRHALFREG];
384 int i;
385
386 if (__copy_from_user(buf, from, ELF_NVSRHALFREG * sizeof(double)))
387 return 1;
388 for (i = 0; i < ELF_NVSRHALFREG ; i++)
389 task->thread.fpr[i][TS_VSRLOWOFFSET] = buf[i];
390 return 0;
391}
392#else
393inline unsigned long copy_fpr_to_user(void __user *to,
394 struct task_struct *task)
395{
396 return __copy_to_user(to, task->thread.fpr,
397 ELF_NFPREG * sizeof(double));
398}
399
400inline unsigned long copy_fpr_from_user(struct task_struct *task,
401 void __user *from)
402{
403 return __copy_from_user(task->thread.fpr, from,
404 ELF_NFPREG * sizeof(double));
405}
406#endif
407
408/*
409 * Save the current user registers on the user stack.
410 * We only save the altivec/spe registers if the process has used
411 * altivec/spe instructions at some point.
412 */
413static int save_user_regs(struct pt_regs *regs, struct mcontext __user *frame,
414 int sigret, int ctx_has_vsx_region)
415{
416 unsigned long msr = regs->msr;
417
418 /* Make sure floating point registers are stored in regs */
419 flush_fp_to_thread(current);
420
421 /* save general registers */
422 if (save_general_regs(regs, frame))
423 return 1;
424
425#ifdef CONFIG_ALTIVEC
426 /* save altivec registers */
427 if (current->thread.used_vr) {
428 flush_altivec_to_thread(current);
429 if (__copy_to_user(&frame->mc_vregs, current->thread.vr,
430 ELF_NVRREG * sizeof(vector128)))
431 return 1;
432 /* set MSR_VEC in the saved MSR value to indicate that
433 frame->mc_vregs contains valid data */
434 msr |= MSR_VEC;
435 }
436 /* else assert((regs->msr & MSR_VEC) == 0) */
437
438 /* We always copy to/from vrsave, it's 0 if we don't have or don't
439 * use altivec. Since VSCR only contains 32 bits saved in the least
440 * significant bits of a vector, we "cheat" and stuff VRSAVE in the
441 * most significant bits of that same vector. --BenH
442 */
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#ifdef CONFIG_VSX
449 /*
450 * Copy VSR 0-31 upper half from thread_struct to local
451 * buffer, then write that to userspace. Also set MSR_VSX in
452 * the saved MSR value to indicate that frame->mc_vregs
453 * contains valid data
454 */
455 if (current->thread.used_vsr && ctx_has_vsx_region) {
456 __giveup_vsx(current);
457 if (copy_vsx_to_user(&frame->mc_vsregs, current))
458 return 1;
459 msr |= MSR_VSX;
460 }
461#endif /* CONFIG_VSX */
462#ifdef CONFIG_SPE
463 /* save spe registers */
464 if (current->thread.used_spe) {
465 flush_spe_to_thread(current);
466 if (__copy_to_user(&frame->mc_vregs, current->thread.evr,
467 ELF_NEVRREG * sizeof(u32)))
468 return 1;
469 /* set MSR_SPE in the saved MSR value to indicate that
470 frame->mc_vregs contains valid data */
471 msr |= MSR_SPE;
472 }
473 /* else assert((regs->msr & MSR_SPE) == 0) */
474
475 /* We always copy to/from spefscr */
476 if (__put_user(current->thread.spefscr, (u32 __user *)&frame->mc_vregs + ELF_NEVRREG))
477 return 1;
478#endif /* CONFIG_SPE */
479
480 if (__put_user(msr, &frame->mc_gregs[PT_MSR]))
481 return 1;
482 if (sigret) {
483 /* Set up the sigreturn trampoline: li r0,sigret; sc */
484 if (__put_user(0x38000000UL + sigret, &frame->tramp[0])
485 || __put_user(0x44000002UL, &frame->tramp[1]))
486 return 1;
487 flush_icache_range((unsigned long) &frame->tramp[0],
488 (unsigned long) &frame->tramp[2]);
489 }
490
491 return 0;
492}
493
494/*
495 * Restore the current user register values from the user stack,
496 * (except for MSR).
497 */
498static long restore_user_regs(struct pt_regs *regs,
499 struct mcontext __user *sr, int sig)
500{
501 long err;
502 unsigned int save_r2 = 0;
503 unsigned long msr;
504#ifdef CONFIG_VSX
505 int i;
506#endif
507
508 /*
509 * restore general registers but not including MSR or SOFTE. Also
510 * take care of keeping r2 (TLS) intact if not a signal
511 */
512 if (!sig)
513 save_r2 = (unsigned int)regs->gpr[2];
514 err = restore_general_regs(regs, sr);
515 regs->trap = 0;
516 err |= __get_user(msr, &sr->mc_gregs[PT_MSR]);
517 if (!sig)
518 regs->gpr[2] = (unsigned long) save_r2;
519 if (err)
520 return 1;
521
522 /* if doing signal return, restore the previous little-endian mode */
523 if (sig)
524 regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE);
525
526 /*
527 * Do this before updating the thread state in
528 * current->thread.fpr/vr/evr. That way, if we get preempted
529 * and another task grabs the FPU/Altivec/SPE, it won't be
530 * tempted to save the current CPU state into the thread_struct
531 * and corrupt what we are writing there.
532 */
533 discard_lazy_cpu_state();
534
535#ifdef CONFIG_ALTIVEC
536 /*
537 * Force the process to reload the altivec registers from
538 * current->thread when it next does altivec instructions
539 */
540 regs->msr &= ~MSR_VEC;
541 if (msr & MSR_VEC) {
542 /* restore altivec registers from the stack */
543 if (__copy_from_user(current->thread.vr, &sr->mc_vregs,
544 sizeof(sr->mc_vregs)))
545 return 1;
546 } else if (current->thread.used_vr)
547 memset(current->thread.vr, 0, ELF_NVRREG * sizeof(vector128));
548
549 /* Always get VRSAVE back */
550 if (__get_user(current->thread.vrsave, (u32 __user *)&sr->mc_vregs[32]))
551 return 1;
552#endif /* CONFIG_ALTIVEC */
553 if (copy_fpr_from_user(current, &sr->mc_fregs))
554 return 1;
555
556#ifdef CONFIG_VSX
557 /*
558 * Force the process to reload the VSX registers from
559 * current->thread when it next does VSX instruction.
560 */
561 regs->msr &= ~MSR_VSX;
562 if (msr & MSR_VSX) {
563 /*
564 * Restore altivec registers from the stack to a local
565 * buffer, then write this out to the thread_struct
566 */
567 if (copy_vsx_from_user(current, &sr->mc_vsregs))
568 return 1;
569 } else if (current->thread.used_vsr)
570 for (i = 0; i < 32 ; i++)
571 current->thread.fpr[i][TS_VSRLOWOFFSET] = 0;
572#endif /* CONFIG_VSX */
573 /*
574 * force the process to reload the FP registers from
575 * current->thread when it next does FP instructions
576 */
577 regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1);
578
579#ifdef CONFIG_SPE
580 /* force the process to reload the spe registers from
581 current->thread when it next does spe instructions */
582 regs->msr &= ~MSR_SPE;
583 if (msr & MSR_SPE) {
584 /* restore spe registers from the stack */
585 if (__copy_from_user(current->thread.evr, &sr->mc_vregs,
586 ELF_NEVRREG * sizeof(u32)))
587 return 1;
588 } else if (current->thread.used_spe)
589 memset(current->thread.evr, 0, ELF_NEVRREG * sizeof(u32));
590
591 /* Always get SPEFSCR back */
592 if (__get_user(current->thread.spefscr, (u32 __user *)&sr->mc_vregs + ELF_NEVRREG))
593 return 1;
594#endif /* CONFIG_SPE */
595
596 return 0;
597}
598
599#ifdef CONFIG_PPC64
600long compat_sys_rt_sigaction(int sig, const struct sigaction32 __user *act,
601 struct sigaction32 __user *oact, size_t sigsetsize)
602{
603 struct k_sigaction new_ka, old_ka;
604 int ret;
605
606 /* XXX: Don't preclude handling different sized sigset_t's. */
607 if (sigsetsize != sizeof(compat_sigset_t))
608 return -EINVAL;
609
610 if (act) {
611 compat_uptr_t handler;
612
613 ret = get_user(handler, &act->sa_handler);
614 new_ka.sa.sa_handler = compat_ptr(handler);
615 ret |= get_sigset_t(&new_ka.sa.sa_mask, &act->sa_mask);
616 ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
617 if (ret)
618 return -EFAULT;
619 }
620
621 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
622 if (!ret && oact) {
623 ret = put_user(to_user_ptr(old_ka.sa.sa_handler), &oact->sa_handler);
624 ret |= put_sigset_t(&oact->sa_mask, &old_ka.sa.sa_mask);
625 ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
626 }
627 return ret;
628}
629
630/*
631 * Note: it is necessary to treat how as an unsigned int, with the
632 * corresponding cast to a signed int to insure that the proper
633 * conversion (sign extension) between the register representation
634 * of a signed int (msr in 32-bit mode) and the register representation
635 * of a signed int (msr in 64-bit mode) is performed.
636 */
637long compat_sys_rt_sigprocmask(u32 how, compat_sigset_t __user *set,
638 compat_sigset_t __user *oset, size_t sigsetsize)
639{
640 sigset_t s;
641 sigset_t __user *up;
642 int ret;
643 mm_segment_t old_fs = get_fs();
644
645 if (set) {
646 if (get_sigset_t(&s, set))
647 return -EFAULT;
648 }
649
650 set_fs(KERNEL_DS);
651 /* This is valid because of the set_fs() */
652 up = (sigset_t __user *) &s;
653 ret = sys_rt_sigprocmask((int)how, set ? up : NULL, oset ? up : NULL,
654 sigsetsize);
655 set_fs(old_fs);
656 if (ret)
657 return ret;
658 if (oset) {
659 if (put_sigset_t(oset, &s))
660 return -EFAULT;
661 }
662 return 0;
663}
664
665long compat_sys_rt_sigpending(compat_sigset_t __user *set, compat_size_t sigsetsize)
666{
667 sigset_t s;
668 int ret;
669 mm_segment_t old_fs = get_fs();
670
671 set_fs(KERNEL_DS);
672 /* The __user pointer cast is valid because of the set_fs() */
673 ret = sys_rt_sigpending((sigset_t __user *) &s, sigsetsize);
674 set_fs(old_fs);
675 if (!ret) {
676 if (put_sigset_t(set, &s))
677 return -EFAULT;
678 }
679 return ret;
680}
681
682
683int copy_siginfo_to_user32(struct compat_siginfo __user *d, siginfo_t *s)
684{
685 int err;
686
687 if (!access_ok (VERIFY_WRITE, d, sizeof(*d)))
688 return -EFAULT;
689
690 /* If you change siginfo_t structure, please be sure
691 * this code is fixed accordingly.
692 * It should never copy any pad contained in the structure
693 * to avoid security leaks, but must copy the generic
694 * 3 ints plus the relevant union member.
695 * This routine must convert siginfo from 64bit to 32bit as well
696 * at the same time.
697 */
698 err = __put_user(s->si_signo, &d->si_signo);
699 err |= __put_user(s->si_errno, &d->si_errno);
700 err |= __put_user((short)s->si_code, &d->si_code);
701 if (s->si_code < 0)
702 err |= __copy_to_user(&d->_sifields._pad, &s->_sifields._pad,
703 SI_PAD_SIZE32);
704 else switch(s->si_code >> 16) {
705 case __SI_CHLD >> 16:
706 err |= __put_user(s->si_pid, &d->si_pid);
707 err |= __put_user(s->si_uid, &d->si_uid);
708 err |= __put_user(s->si_utime, &d->si_utime);
709 err |= __put_user(s->si_stime, &d->si_stime);
710 err |= __put_user(s->si_status, &d->si_status);
711 break;
712 case __SI_FAULT >> 16:
713 err |= __put_user((unsigned int)(unsigned long)s->si_addr,
714 &d->si_addr);
715 break;
716 case __SI_POLL >> 16:
717 err |= __put_user(s->si_band, &d->si_band);
718 err |= __put_user(s->si_fd, &d->si_fd);
719 break;
720 case __SI_TIMER >> 16:
721 err |= __put_user(s->si_tid, &d->si_tid);
722 err |= __put_user(s->si_overrun, &d->si_overrun);
723 err |= __put_user(s->si_int, &d->si_int);
724 break;
725 case __SI_RT >> 16: /* This is not generated by the kernel as of now. */
726 case __SI_MESGQ >> 16:
727 err |= __put_user(s->si_int, &d->si_int);
728 /* fallthrough */
729 case __SI_KILL >> 16:
730 default:
731 err |= __put_user(s->si_pid, &d->si_pid);
732 err |= __put_user(s->si_uid, &d->si_uid);
733 break;
734 }
735 return err;
736}
737
738#define copy_siginfo_to_user copy_siginfo_to_user32
739
740int copy_siginfo_from_user32(siginfo_t *to, struct compat_siginfo __user *from)
741{
742 memset(to, 0, sizeof *to);
743
744 if (copy_from_user(to, from, 3*sizeof(int)) ||
745 copy_from_user(to->_sifields._pad,
746 from->_sifields._pad, SI_PAD_SIZE32))
747 return -EFAULT;
748
749 return 0;
750}
751
752/*
753 * Note: it is necessary to treat pid and sig as unsigned ints, with the
754 * corresponding cast to a signed int to insure that the proper conversion
755 * (sign extension) between the register representation of a signed int
756 * (msr in 32-bit mode) and the register representation of a signed int
757 * (msr in 64-bit mode) is performed.
758 */
759long compat_sys_rt_sigqueueinfo(u32 pid, u32 sig, compat_siginfo_t __user *uinfo)
760{
761 siginfo_t info;
762 int ret;
763 mm_segment_t old_fs = get_fs();
764
765 ret = copy_siginfo_from_user32(&info, uinfo);
766 if (unlikely(ret))
767 return ret;
768
769 set_fs (KERNEL_DS);
770 /* The __user pointer cast is valid becasuse of the set_fs() */
771 ret = sys_rt_sigqueueinfo((int)pid, (int)sig, (siginfo_t __user *) &info);
772 set_fs (old_fs);
773 return ret;
774}
775/*
776 * Start Alternate signal stack support
777 *
778 * System Calls
779 * sigaltatck compat_sys_sigaltstack
780 */
781
782int compat_sys_sigaltstack(u32 __new, u32 __old, int r5,
783 int r6, int r7, int r8, struct pt_regs *regs)
784{
785 stack_32_t __user * newstack = compat_ptr(__new);
786 stack_32_t __user * oldstack = compat_ptr(__old);
787 stack_t uss, uoss;
788 int ret;
789 mm_segment_t old_fs;
790 unsigned long sp;
791 compat_uptr_t ss_sp;
792
793 /*
794 * set sp to the user stack on entry to the system call
795 * the system call router sets R9 to the saved registers
796 */
797 sp = regs->gpr[1];
798
799 /* Put new stack info in local 64 bit stack struct */
800 if (newstack) {
801 if (get_user(ss_sp, &newstack->ss_sp) ||
802 __get_user(uss.ss_flags, &newstack->ss_flags) ||
803 __get_user(uss.ss_size, &newstack->ss_size))
804 return -EFAULT;
805 uss.ss_sp = compat_ptr(ss_sp);
806 }
807
808 old_fs = get_fs();
809 set_fs(KERNEL_DS);
810 /* The __user pointer casts are valid because of the set_fs() */
811 ret = do_sigaltstack(
812 newstack ? (stack_t __user *) &uss : NULL,
813 oldstack ? (stack_t __user *) &uoss : NULL,
814 sp);
815 set_fs(old_fs);
816 /* Copy the stack information to the user output buffer */
817 if (!ret && oldstack &&
818 (put_user(ptr_to_compat(uoss.ss_sp), &oldstack->ss_sp) ||
819 __put_user(uoss.ss_flags, &oldstack->ss_flags) ||
820 __put_user(uoss.ss_size, &oldstack->ss_size)))
821 return -EFAULT;
822 return ret;
823}
824#endif /* CONFIG_PPC64 */
825
826/*
827 * Set up a signal frame for a "real-time" signal handler
828 * (one which gets siginfo).
829 */
830int handle_rt_signal32(unsigned long sig, struct k_sigaction *ka,
831 siginfo_t *info, sigset_t *oldset,
832 struct pt_regs *regs)
833{
834 struct rt_sigframe __user *rt_sf;
835 struct mcontext __user *frame;
836 void __user *addr;
837 unsigned long newsp = 0;
838
839 /* Set up Signal Frame */
840 /* Put a Real Time Context onto stack */
841 rt_sf = get_sigframe(ka, regs, sizeof(*rt_sf), 1);
842 addr = rt_sf;
843 if (unlikely(rt_sf == NULL))
844 goto badframe;
845
846 /* Put the siginfo & fill in most of the ucontext */
847 if (copy_siginfo_to_user(&rt_sf->info, info)
848 || __put_user(0, &rt_sf->uc.uc_flags)
849 || __put_user(0, &rt_sf->uc.uc_link)
850 || __put_user(current->sas_ss_sp, &rt_sf->uc.uc_stack.ss_sp)
851 || __put_user(sas_ss_flags(regs->gpr[1]),
852 &rt_sf->uc.uc_stack.ss_flags)
853 || __put_user(current->sas_ss_size, &rt_sf->uc.uc_stack.ss_size)
854 || __put_user(to_user_ptr(&rt_sf->uc.uc_mcontext),
855 &rt_sf->uc.uc_regs)
856 || put_sigset_t(&rt_sf->uc.uc_sigmask, oldset))
857 goto badframe;
858
859 /* Save user registers on the stack */
860 frame = &rt_sf->uc.uc_mcontext;
861 addr = frame;
862 if (vdso32_rt_sigtramp && current->mm->context.vdso_base) {
863 if (save_user_regs(regs, frame, 0, 1))
864 goto badframe;
865 regs->link = current->mm->context.vdso_base + vdso32_rt_sigtramp;
866 } else {
867 if (save_user_regs(regs, frame, __NR_rt_sigreturn, 1))
868 goto badframe;
869 regs->link = (unsigned long) frame->tramp;
870 }
871
872 current->thread.fpscr.val = 0; /* turn off all fp exceptions */
873
874 /* create a stack frame for the caller of the handler */
875 newsp = ((unsigned long)rt_sf) - (__SIGNAL_FRAMESIZE + 16);
876 addr = (void __user *)regs->gpr[1];
877 if (put_user(regs->gpr[1], (u32 __user *)newsp))
878 goto badframe;
879
880 /* Fill registers for signal handler */
881 regs->gpr[1] = newsp;
882 regs->gpr[3] = sig;
883 regs->gpr[4] = (unsigned long) &rt_sf->info;
884 regs->gpr[5] = (unsigned long) &rt_sf->uc;
885 regs->gpr[6] = (unsigned long) rt_sf;
886 regs->nip = (unsigned long) ka->sa.sa_handler;
887 /* enter the signal handler in big-endian mode */
888 regs->msr &= ~MSR_LE;
889 return 1;
890
891badframe:
892#ifdef DEBUG_SIG
893 printk("badframe in handle_rt_signal, regs=%p frame=%p newsp=%lx\n",
894 regs, frame, newsp);
895#endif
896 if (show_unhandled_signals)
897 printk_ratelimited(KERN_INFO
898 "%s[%d]: bad frame in handle_rt_signal32: "
899 "%p nip %08lx lr %08lx\n",
900 current->comm, current->pid,
901 addr, regs->nip, regs->link);
902
903 force_sigsegv(sig, current);
904 return 0;
905}
906
907static int do_setcontext(struct ucontext __user *ucp, struct pt_regs *regs, int sig)
908{
909 sigset_t set;
910 struct mcontext __user *mcp;
911
912 if (get_sigset_t(&set, &ucp->uc_sigmask))
913 return -EFAULT;
914#ifdef CONFIG_PPC64
915 {
916 u32 cmcp;
917
918 if (__get_user(cmcp, &ucp->uc_regs))
919 return -EFAULT;
920 mcp = (struct mcontext __user *)(u64)cmcp;
921 /* no need to check access_ok(mcp), since mcp < 4GB */
922 }
923#else
924 if (__get_user(mcp, &ucp->uc_regs))
925 return -EFAULT;
926 if (!access_ok(VERIFY_READ, mcp, sizeof(*mcp)))
927 return -EFAULT;
928#endif
929 restore_sigmask(&set);
930 if (restore_user_regs(regs, mcp, sig))
931 return -EFAULT;
932
933 return 0;
934}
935
936long sys_swapcontext(struct ucontext __user *old_ctx,
937 struct ucontext __user *new_ctx,
938 int ctx_size, int r6, int r7, int r8, struct pt_regs *regs)
939{
940 unsigned char tmp;
941 int ctx_has_vsx_region = 0;
942
943#ifdef CONFIG_PPC64
944 unsigned long new_msr = 0;
945
946 if (new_ctx) {
947 struct mcontext __user *mcp;
948 u32 cmcp;
949
950 /*
951 * Get pointer to the real mcontext. No need for
952 * access_ok since we are dealing with compat
953 * pointers.
954 */
955 if (__get_user(cmcp, &new_ctx->uc_regs))
956 return -EFAULT;
957 mcp = (struct mcontext __user *)(u64)cmcp;
958 if (__get_user(new_msr, &mcp->mc_gregs[PT_MSR]))
959 return -EFAULT;
960 }
961 /*
962 * Check that the context is not smaller than the original
963 * size (with VMX but without VSX)
964 */
965 if (ctx_size < UCONTEXTSIZEWITHOUTVSX)
966 return -EINVAL;
967 /*
968 * If the new context state sets the MSR VSX bits but
969 * it doesn't provide VSX state.
970 */
971 if ((ctx_size < sizeof(struct ucontext)) &&
972 (new_msr & MSR_VSX))
973 return -EINVAL;
974 /* Does the context have enough room to store VSX data? */
975 if (ctx_size >= sizeof(struct ucontext))
976 ctx_has_vsx_region = 1;
977#else
978 /* Context size is for future use. Right now, we only make sure
979 * we are passed something we understand
980 */
981 if (ctx_size < sizeof(struct ucontext))
982 return -EINVAL;
983#endif
984 if (old_ctx != NULL) {
985 struct mcontext __user *mctx;
986
987 /*
988 * old_ctx might not be 16-byte aligned, in which
989 * case old_ctx->uc_mcontext won't be either.
990 * Because we have the old_ctx->uc_pad2 field
991 * before old_ctx->uc_mcontext, we need to round down
992 * from &old_ctx->uc_mcontext to a 16-byte boundary.
993 */
994 mctx = (struct mcontext __user *)
995 ((unsigned long) &old_ctx->uc_mcontext & ~0xfUL);
996 if (!access_ok(VERIFY_WRITE, old_ctx, ctx_size)
997 || save_user_regs(regs, mctx, 0, ctx_has_vsx_region)
998 || put_sigset_t(&old_ctx->uc_sigmask, ¤t->blocked)
999 || __put_user(to_user_ptr(mctx), &old_ctx->uc_regs))
1000 return -EFAULT;
1001 }
1002 if (new_ctx == NULL)
1003 return 0;
1004 if (!access_ok(VERIFY_READ, new_ctx, ctx_size)
1005 || __get_user(tmp, (u8 __user *) new_ctx)
1006 || __get_user(tmp, (u8 __user *) new_ctx + ctx_size - 1))
1007 return -EFAULT;
1008
1009 /*
1010 * If we get a fault copying the context into the kernel's
1011 * image of the user's registers, we can't just return -EFAULT
1012 * because the user's registers will be corrupted. For instance
1013 * the NIP value may have been updated but not some of the
1014 * other registers. Given that we have done the access_ok
1015 * and successfully read the first and last bytes of the region
1016 * above, this should only happen in an out-of-memory situation
1017 * or if another thread unmaps the region containing the context.
1018 * We kill the task with a SIGSEGV in this situation.
1019 */
1020 if (do_setcontext(new_ctx, regs, 0))
1021 do_exit(SIGSEGV);
1022
1023 set_thread_flag(TIF_RESTOREALL);
1024 return 0;
1025}
1026
1027long sys_rt_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8,
1028 struct pt_regs *regs)
1029{
1030 struct rt_sigframe __user *rt_sf;
1031
1032 /* Always make any pending restarted system calls return -EINTR */
1033 current_thread_info()->restart_block.fn = do_no_restart_syscall;
1034
1035 rt_sf = (struct rt_sigframe __user *)
1036 (regs->gpr[1] + __SIGNAL_FRAMESIZE + 16);
1037 if (!access_ok(VERIFY_READ, rt_sf, sizeof(*rt_sf)))
1038 goto bad;
1039 if (do_setcontext(&rt_sf->uc, regs, 1))
1040 goto bad;
1041
1042 /*
1043 * It's not clear whether or why it is desirable to save the
1044 * sigaltstack setting on signal delivery and restore it on
1045 * signal return. But other architectures do this and we have
1046 * always done it up until now so it is probably better not to
1047 * change it. -- paulus
1048 */
1049#ifdef CONFIG_PPC64
1050 /*
1051 * We use the compat_sys_ version that does the 32/64 bits conversion
1052 * and takes userland pointer directly. What about error checking ?
1053 * nobody does any...
1054 */
1055 compat_sys_sigaltstack((u32)(u64)&rt_sf->uc.uc_stack, 0, 0, 0, 0, 0, regs);
1056#else
1057 do_sigaltstack(&rt_sf->uc.uc_stack, NULL, regs->gpr[1]);
1058#endif
1059 set_thread_flag(TIF_RESTOREALL);
1060 return 0;
1061
1062 bad:
1063 if (show_unhandled_signals)
1064 printk_ratelimited(KERN_INFO
1065 "%s[%d]: bad frame in sys_rt_sigreturn: "
1066 "%p nip %08lx lr %08lx\n",
1067 current->comm, current->pid,
1068 rt_sf, regs->nip, regs->link);
1069
1070 force_sig(SIGSEGV, current);
1071 return 0;
1072}
1073
1074#ifdef CONFIG_PPC32
1075int sys_debug_setcontext(struct ucontext __user *ctx,
1076 int ndbg, struct sig_dbg_op __user *dbg,
1077 int r6, int r7, int r8,
1078 struct pt_regs *regs)
1079{
1080 struct sig_dbg_op op;
1081 int i;
1082 unsigned char tmp;
1083 unsigned long new_msr = regs->msr;
1084#ifdef CONFIG_PPC_ADV_DEBUG_REGS
1085 unsigned long new_dbcr0 = current->thread.dbcr0;
1086#endif
1087
1088 for (i=0; i<ndbg; i++) {
1089 if (copy_from_user(&op, dbg + i, sizeof(op)))
1090 return -EFAULT;
1091 switch (op.dbg_type) {
1092 case SIG_DBG_SINGLE_STEPPING:
1093#ifdef CONFIG_PPC_ADV_DEBUG_REGS
1094 if (op.dbg_value) {
1095 new_msr |= MSR_DE;
1096 new_dbcr0 |= (DBCR0_IDM | DBCR0_IC);
1097 } else {
1098 new_dbcr0 &= ~DBCR0_IC;
1099 if (!DBCR_ACTIVE_EVENTS(new_dbcr0,
1100 current->thread.dbcr1)) {
1101 new_msr &= ~MSR_DE;
1102 new_dbcr0 &= ~DBCR0_IDM;
1103 }
1104 }
1105#else
1106 if (op.dbg_value)
1107 new_msr |= MSR_SE;
1108 else
1109 new_msr &= ~MSR_SE;
1110#endif
1111 break;
1112 case SIG_DBG_BRANCH_TRACING:
1113#ifdef CONFIG_PPC_ADV_DEBUG_REGS
1114 return -EINVAL;
1115#else
1116 if (op.dbg_value)
1117 new_msr |= MSR_BE;
1118 else
1119 new_msr &= ~MSR_BE;
1120#endif
1121 break;
1122
1123 default:
1124 return -EINVAL;
1125 }
1126 }
1127
1128 /* We wait until here to actually install the values in the
1129 registers so if we fail in the above loop, it will not
1130 affect the contents of these registers. After this point,
1131 failure is a problem, anyway, and it's very unlikely unless
1132 the user is really doing something wrong. */
1133 regs->msr = new_msr;
1134#ifdef CONFIG_PPC_ADV_DEBUG_REGS
1135 current->thread.dbcr0 = new_dbcr0;
1136#endif
1137
1138 if (!access_ok(VERIFY_READ, ctx, sizeof(*ctx))
1139 || __get_user(tmp, (u8 __user *) ctx)
1140 || __get_user(tmp, (u8 __user *) (ctx + 1) - 1))
1141 return -EFAULT;
1142
1143 /*
1144 * If we get a fault copying the context into the kernel's
1145 * image of the user's registers, we can't just return -EFAULT
1146 * because the user's registers will be corrupted. For instance
1147 * the NIP value may have been updated but not some of the
1148 * other registers. Given that we have done the access_ok
1149 * and successfully read the first and last bytes of the region
1150 * above, this should only happen in an out-of-memory situation
1151 * or if another thread unmaps the region containing the context.
1152 * We kill the task with a SIGSEGV in this situation.
1153 */
1154 if (do_setcontext(ctx, regs, 1)) {
1155 if (show_unhandled_signals)
1156 printk_ratelimited(KERN_INFO "%s[%d]: bad frame in "
1157 "sys_debug_setcontext: %p nip %08lx "
1158 "lr %08lx\n",
1159 current->comm, current->pid,
1160 ctx, regs->nip, regs->link);
1161
1162 force_sig(SIGSEGV, current);
1163 goto out;
1164 }
1165
1166 /*
1167 * It's not clear whether or why it is desirable to save the
1168 * sigaltstack setting on signal delivery and restore it on
1169 * signal return. But other architectures do this and we have
1170 * always done it up until now so it is probably better not to
1171 * change it. -- paulus
1172 */
1173 do_sigaltstack(&ctx->uc_stack, NULL, regs->gpr[1]);
1174
1175 set_thread_flag(TIF_RESTOREALL);
1176 out:
1177 return 0;
1178}
1179#endif
1180
1181/*
1182 * OK, we're invoking a handler
1183 */
1184int handle_signal32(unsigned long sig, struct k_sigaction *ka,
1185 siginfo_t *info, sigset_t *oldset, struct pt_regs *regs)
1186{
1187 struct sigcontext __user *sc;
1188 struct sigframe __user *frame;
1189 unsigned long newsp = 0;
1190
1191 /* Set up Signal Frame */
1192 frame = get_sigframe(ka, regs, sizeof(*frame), 1);
1193 if (unlikely(frame == NULL))
1194 goto badframe;
1195 sc = (struct sigcontext __user *) &frame->sctx;
1196
1197#if _NSIG != 64
1198#error "Please adjust handle_signal()"
1199#endif
1200 if (__put_user(to_user_ptr(ka->sa.sa_handler), &sc->handler)
1201 || __put_user(oldset->sig[0], &sc->oldmask)
1202#ifdef CONFIG_PPC64
1203 || __put_user((oldset->sig[0] >> 32), &sc->_unused[3])
1204#else
1205 || __put_user(oldset->sig[1], &sc->_unused[3])
1206#endif
1207 || __put_user(to_user_ptr(&frame->mctx), &sc->regs)
1208 || __put_user(sig, &sc->signal))
1209 goto badframe;
1210
1211 if (vdso32_sigtramp && current->mm->context.vdso_base) {
1212 if (save_user_regs(regs, &frame->mctx, 0, 1))
1213 goto badframe;
1214 regs->link = current->mm->context.vdso_base + vdso32_sigtramp;
1215 } else {
1216 if (save_user_regs(regs, &frame->mctx, __NR_sigreturn, 1))
1217 goto badframe;
1218 regs->link = (unsigned long) frame->mctx.tramp;
1219 }
1220
1221 current->thread.fpscr.val = 0; /* turn off all fp exceptions */
1222
1223 /* create a stack frame for the caller of the handler */
1224 newsp = ((unsigned long)frame) - __SIGNAL_FRAMESIZE;
1225 if (put_user(regs->gpr[1], (u32 __user *)newsp))
1226 goto badframe;
1227
1228 regs->gpr[1] = newsp;
1229 regs->gpr[3] = sig;
1230 regs->gpr[4] = (unsigned long) sc;
1231 regs->nip = (unsigned long) ka->sa.sa_handler;
1232 /* enter the signal handler in big-endian mode */
1233 regs->msr &= ~MSR_LE;
1234
1235 return 1;
1236
1237badframe:
1238#ifdef DEBUG_SIG
1239 printk("badframe in handle_signal, regs=%p frame=%p newsp=%lx\n",
1240 regs, frame, newsp);
1241#endif
1242 if (show_unhandled_signals)
1243 printk_ratelimited(KERN_INFO
1244 "%s[%d]: bad frame in handle_signal32: "
1245 "%p nip %08lx lr %08lx\n",
1246 current->comm, current->pid,
1247 frame, regs->nip, regs->link);
1248
1249 force_sigsegv(sig, current);
1250 return 0;
1251}
1252
1253/*
1254 * Do a signal return; undo the signal stack.
1255 */
1256long sys_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8,
1257 struct pt_regs *regs)
1258{
1259 struct sigcontext __user *sc;
1260 struct sigcontext sigctx;
1261 struct mcontext __user *sr;
1262 void __user *addr;
1263 sigset_t set;
1264
1265 /* Always make any pending restarted system calls return -EINTR */
1266 current_thread_info()->restart_block.fn = do_no_restart_syscall;
1267
1268 sc = (struct sigcontext __user *)(regs->gpr[1] + __SIGNAL_FRAMESIZE);
1269 addr = sc;
1270 if (copy_from_user(&sigctx, sc, sizeof(sigctx)))
1271 goto badframe;
1272
1273#ifdef CONFIG_PPC64
1274 /*
1275 * Note that PPC32 puts the upper 32 bits of the sigmask in the
1276 * unused part of the signal stackframe
1277 */
1278 set.sig[0] = sigctx.oldmask + ((long)(sigctx._unused[3]) << 32);
1279#else
1280 set.sig[0] = sigctx.oldmask;
1281 set.sig[1] = sigctx._unused[3];
1282#endif
1283 restore_sigmask(&set);
1284
1285 sr = (struct mcontext __user *)from_user_ptr(sigctx.regs);
1286 addr = sr;
1287 if (!access_ok(VERIFY_READ, sr, sizeof(*sr))
1288 || restore_user_regs(regs, sr, 1))
1289 goto badframe;
1290
1291 set_thread_flag(TIF_RESTOREALL);
1292 return 0;
1293
1294badframe:
1295 if (show_unhandled_signals)
1296 printk_ratelimited(KERN_INFO
1297 "%s[%d]: bad frame in sys_sigreturn: "
1298 "%p nip %08lx lr %08lx\n",
1299 current->comm, current->pid,
1300 addr, regs->nip, regs->link);
1301
1302 force_sig(SIGSEGV, current);
1303 return 0;
1304}