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