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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#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}