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Merge tag 'v3.3.7' into 3.3/master
[zen-stable.git] / arch / powerpc / kernel / ptrace.c
blob5b43325402bcc8e5435c1e2804685e81cb24df72
1 /*
2 * PowerPC version
3 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
4 *
5 * Derived from "arch/m68k/kernel/ptrace.c"
6 * Copyright (C) 1994 by Hamish Macdonald
7 * Taken from linux/kernel/ptrace.c and modified for M680x0.
8 * linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds
9 *
10 * Modified by Cort Dougan (cort@hq.fsmlabs.com)
11 * and Paul Mackerras (paulus@samba.org).
12 *
13 * This file is subject to the terms and conditions of the GNU General
14 * Public License. See the file README.legal in the main directory of
15 * this archive for more details.
16 */
17
18 #include <linux/kernel.h>
19 #include <linux/sched.h>
20 #include <linux/mm.h>
21 #include <linux/smp.h>
22 #include <linux/errno.h>
23 #include <linux/ptrace.h>
24 #include <linux/regset.h>
25 #include <linux/tracehook.h>
26 #include <linux/elf.h>
27 #include <linux/user.h>
28 #include <linux/security.h>
29 #include <linux/signal.h>
30 #include <linux/seccomp.h>
31 #include <linux/audit.h>
32 #include <trace/syscall.h>
33 #include <linux/hw_breakpoint.h>
34 #include <linux/perf_event.h>
35
36 #include <asm/uaccess.h>
37 #include <asm/page.h>
38 #include <asm/pgtable.h>
39 #include <asm/system.h>
40
41 #define CREATE_TRACE_POINTS
42 #include <trace/events/syscalls.h>
43
44 /*
45 * The parameter save area on the stack is used to store arguments being passed
46 * to callee function and is located at fixed offset from stack pointer.
47 */
48 #ifdef CONFIG_PPC32
49 #define PARAMETER_SAVE_AREA_OFFSET 24 /* bytes */
50 #else /* CONFIG_PPC32 */
51 #define PARAMETER_SAVE_AREA_OFFSET 48 /* bytes */
52 #endif
53
54 struct pt_regs_offset {
55 const char *name;
56 int offset;
57 };
58
59 #define STR(s) #s /* convert to string */
60 #define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
61 #define GPR_OFFSET_NAME(num) \
62 {.name = STR(gpr##num), .offset = offsetof(struct pt_regs, gpr[num])}
63 #define REG_OFFSET_END {.name = NULL, .offset = 0}
64
65 static const struct pt_regs_offset regoffset_table[] = {
66 GPR_OFFSET_NAME(0),
67 GPR_OFFSET_NAME(1),
68 GPR_OFFSET_NAME(2),
69 GPR_OFFSET_NAME(3),
70 GPR_OFFSET_NAME(4),
71 GPR_OFFSET_NAME(5),
72 GPR_OFFSET_NAME(6),
73 GPR_OFFSET_NAME(7),
74 GPR_OFFSET_NAME(8),
75 GPR_OFFSET_NAME(9),
76 GPR_OFFSET_NAME(10),
77 GPR_OFFSET_NAME(11),
78 GPR_OFFSET_NAME(12),
79 GPR_OFFSET_NAME(13),
80 GPR_OFFSET_NAME(14),
81 GPR_OFFSET_NAME(15),
82 GPR_OFFSET_NAME(16),
83 GPR_OFFSET_NAME(17),
84 GPR_OFFSET_NAME(18),
85 GPR_OFFSET_NAME(19),
86 GPR_OFFSET_NAME(20),
87 GPR_OFFSET_NAME(21),
88 GPR_OFFSET_NAME(22),
89 GPR_OFFSET_NAME(23),
90 GPR_OFFSET_NAME(24),
91 GPR_OFFSET_NAME(25),
92 GPR_OFFSET_NAME(26),
93 GPR_OFFSET_NAME(27),
94 GPR_OFFSET_NAME(28),
95 GPR_OFFSET_NAME(29),
96 GPR_OFFSET_NAME(30),
97 GPR_OFFSET_NAME(31),
98 REG_OFFSET_NAME(nip),
99 REG_OFFSET_NAME(msr),
100 REG_OFFSET_NAME(ctr),
101 REG_OFFSET_NAME(link),
102 REG_OFFSET_NAME(xer),
103 REG_OFFSET_NAME(ccr),
104 #ifdef CONFIG_PPC64
105 REG_OFFSET_NAME(softe),
106 #else
107 REG_OFFSET_NAME(mq),
108 #endif
109 REG_OFFSET_NAME(trap),
110 REG_OFFSET_NAME(dar),
111 REG_OFFSET_NAME(dsisr),
112 REG_OFFSET_END,
113 };
114
115 /**
116 * regs_query_register_offset() - query register offset from its name
117 * @name: the name of a register
118 *
119 * regs_query_register_offset() returns the offset of a register in struct
120 * pt_regs from its name. If the name is invalid, this returns -EINVAL;
121 */
122 int regs_query_register_offset(const char *name)
123 {
124 const struct pt_regs_offset *roff;
125 for (roff = regoffset_table; roff->name != NULL; roff++)
126 if (!strcmp(roff->name, name))
127 return roff->offset;
128 return -EINVAL;
129 }
130
131 /**
132 * regs_query_register_name() - query register name from its offset
133 * @offset: the offset of a register in struct pt_regs.
134 *
135 * regs_query_register_name() returns the name of a register from its
136 * offset in struct pt_regs. If the @offset is invalid, this returns NULL;
137 */
138 const char *regs_query_register_name(unsigned int offset)
139 {
140 const struct pt_regs_offset *roff;
141 for (roff = regoffset_table; roff->name != NULL; roff++)
142 if (roff->offset == offset)
143 return roff->name;
144 return NULL;
145 }
146
147 /*
148 * does not yet catch signals sent when the child dies.
149 * in exit.c or in signal.c.
150 */
151
152 /*
153 * Set of msr bits that gdb can change on behalf of a process.
154 */
155 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
156 #define MSR_DEBUGCHANGE 0
157 #else
158 #define MSR_DEBUGCHANGE (MSR_SE | MSR_BE)
159 #endif
160
161 /*
162 * Max register writeable via put_reg
163 */
164 #ifdef CONFIG_PPC32
165 #define PT_MAX_PUT_REG PT_MQ
166 #else
167 #define PT_MAX_PUT_REG PT_CCR
168 #endif
169
170 static unsigned long get_user_msr(struct task_struct *task)
171 {
172 return task->thread.regs->msr | task->thread.fpexc_mode;
173 }
174
175 static int set_user_msr(struct task_struct *task, unsigned long msr)
176 {
177 task->thread.regs->msr &= ~MSR_DEBUGCHANGE;
178 task->thread.regs->msr |= msr & MSR_DEBUGCHANGE;
179 return 0;
180 }
181
182 /*
183 * We prevent mucking around with the reserved area of trap
184 * which are used internally by the kernel.
185 */
186 static int set_user_trap(struct task_struct *task, unsigned long trap)
187 {
188 task->thread.regs->trap = trap & 0xfff0;
189 return 0;
190 }
191
192 /*
193 * Get contents of register REGNO in task TASK.
194 */
195 unsigned long ptrace_get_reg(struct task_struct *task, int regno)
196 {
197 if (task->thread.regs == NULL)
198 return -EIO;
199
200 if (regno == PT_MSR)
201 return get_user_msr(task);
202
203 if (regno < (sizeof(struct pt_regs) / sizeof(unsigned long)))
204 return ((unsigned long *)task->thread.regs)[regno];
205
206 return -EIO;
207 }
208
209 /*
210 * Write contents of register REGNO in task TASK.
211 */
212 int ptrace_put_reg(struct task_struct *task, int regno, unsigned long data)
213 {
214 if (task->thread.regs == NULL)
215 return -EIO;
216
217 if (regno == PT_MSR)
218 return set_user_msr(task, data);
219 if (regno == PT_TRAP)
220 return set_user_trap(task, data);
221
222 if (regno <= PT_MAX_PUT_REG) {
223 ((unsigned long *)task->thread.regs)[regno] = data;
224 return 0;
225 }
226 return -EIO;
227 }
228
229 static int gpr_get(struct task_struct *target, const struct user_regset *regset,
230 unsigned int pos, unsigned int count,
231 void *kbuf, void __user *ubuf)
232 {
233 int i, ret;
234
235 if (target->thread.regs == NULL)
236 return -EIO;
237
238 if (!FULL_REGS(target->thread.regs)) {
239 /* We have a partial register set. Fill 14-31 with bogus values */
240 for (i = 14; i < 32; i++)
241 target->thread.regs->gpr[i] = NV_REG_POISON;
242 }
243
244 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
245 target->thread.regs,
246 0, offsetof(struct pt_regs, msr));
247 if (!ret) {
248 unsigned long msr = get_user_msr(target);
249 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &msr,
250 offsetof(struct pt_regs, msr),
251 offsetof(struct pt_regs, msr) +
252 sizeof(msr));
253 }
254
255 BUILD_BUG_ON(offsetof(struct pt_regs, orig_gpr3) !=
256 offsetof(struct pt_regs, msr) + sizeof(long));
257
258 if (!ret)
259 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
260 &target->thread.regs->orig_gpr3,
261 offsetof(struct pt_regs, orig_gpr3),
262 sizeof(struct pt_regs));
263 if (!ret)
264 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
265 sizeof(struct pt_regs), -1);
266
267 return ret;
268 }
269
270 static int gpr_set(struct task_struct *target, const struct user_regset *regset,
271 unsigned int pos, unsigned int count,
272 const void *kbuf, const void __user *ubuf)
273 {
274 unsigned long reg;
275 int ret;
276
277 if (target->thread.regs == NULL)
278 return -EIO;
279
280 CHECK_FULL_REGS(target->thread.regs);
281
282 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
283 target->thread.regs,
284 0, PT_MSR * sizeof(reg));
285
286 if (!ret && count > 0) {
287 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &reg,
288 PT_MSR * sizeof(reg),
289 (PT_MSR + 1) * sizeof(reg));
290 if (!ret)
291 ret = set_user_msr(target, reg);
292 }
293
294 BUILD_BUG_ON(offsetof(struct pt_regs, orig_gpr3) !=
295 offsetof(struct pt_regs, msr) + sizeof(long));
296
297 if (!ret)
298 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
299 &target->thread.regs->orig_gpr3,
300 PT_ORIG_R3 * sizeof(reg),
301 (PT_MAX_PUT_REG + 1) * sizeof(reg));
302
303 if (PT_MAX_PUT_REG + 1 < PT_TRAP && !ret)
304 ret = user_regset_copyin_ignore(
305 &pos, &count, &kbuf, &ubuf,
306 (PT_MAX_PUT_REG + 1) * sizeof(reg),
307 PT_TRAP * sizeof(reg));
308
309 if (!ret && count > 0) {
310 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &reg,
311 PT_TRAP * sizeof(reg),
312 (PT_TRAP + 1) * sizeof(reg));
313 if (!ret)
314 ret = set_user_trap(target, reg);
315 }
316
317 if (!ret)
318 ret = user_regset_copyin_ignore(
319 &pos, &count, &kbuf, &ubuf,
320 (PT_TRAP + 1) * sizeof(reg), -1);
321
322 return ret;
323 }
324
325 static int fpr_get(struct task_struct *target, const struct user_regset *regset,
326 unsigned int pos, unsigned int count,
327 void *kbuf, void __user *ubuf)
328 {
329 #ifdef CONFIG_VSX
330 double buf[33];
331 int i;
332 #endif
333 flush_fp_to_thread(target);
334
335 #ifdef CONFIG_VSX
336 /* copy to local buffer then write that out */
337 for (i = 0; i < 32 ; i++)
338 buf[i] = target->thread.TS_FPR(i);
339 memcpy(&buf[32], &target->thread.fpscr, sizeof(double));
340 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, buf, 0, -1);
341
342 #else
343 BUILD_BUG_ON(offsetof(struct thread_struct, fpscr) !=
344 offsetof(struct thread_struct, TS_FPR(32)));
345
346 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
347 &target->thread.fpr, 0, -1);
348 #endif
349 }
350
351 static int fpr_set(struct task_struct *target, const struct user_regset *regset,
352 unsigned int pos, unsigned int count,
353 const void *kbuf, const void __user *ubuf)
354 {
355 #ifdef CONFIG_VSX
356 double buf[33];
357 int i;
358 #endif
359 flush_fp_to_thread(target);
360
361 #ifdef CONFIG_VSX
362 /* copy to local buffer then write that out */
363 i = user_regset_copyin(&pos, &count, &kbuf, &ubuf, buf, 0, -1);
364 if (i)
365 return i;
366 for (i = 0; i < 32 ; i++)
367 target->thread.TS_FPR(i) = buf[i];
368 memcpy(&target->thread.fpscr, &buf[32], sizeof(double));
369 return 0;
370 #else
371 BUILD_BUG_ON(offsetof(struct thread_struct, fpscr) !=
372 offsetof(struct thread_struct, TS_FPR(32)));
373
374 return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
375 &target->thread.fpr, 0, -1);
376 #endif
377 }
378
379 #ifdef CONFIG_ALTIVEC
380 /*
381 * Get/set all the altivec registers vr0..vr31, vscr, vrsave, in one go.
382 * The transfer totals 34 quadword. Quadwords 0-31 contain the
383 * corresponding vector registers. Quadword 32 contains the vscr as the
384 * last word (offset 12) within that quadword. Quadword 33 contains the
385 * vrsave as the first word (offset 0) within the quadword.
386 *
387 * This definition of the VMX state is compatible with the current PPC32
388 * ptrace interface. This allows signal handling and ptrace to use the
389 * same structures. This also simplifies the implementation of a bi-arch
390 * (combined (32- and 64-bit) gdb.
391 */
392
393 static int vr_active(struct task_struct *target,
394 const struct user_regset *regset)
395 {
396 flush_altivec_to_thread(target);
397 return target->thread.used_vr ? regset->n : 0;
398 }
399
400 static int vr_get(struct task_struct *target, const struct user_regset *regset,
401 unsigned int pos, unsigned int count,
402 void *kbuf, void __user *ubuf)
403 {
404 int ret;
405
406 flush_altivec_to_thread(target);
407
408 BUILD_BUG_ON(offsetof(struct thread_struct, vscr) !=
409 offsetof(struct thread_struct, vr[32]));
410
411 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
412 &target->thread.vr, 0,
413 33 * sizeof(vector128));
414 if (!ret) {
415 /*
416 * Copy out only the low-order word of vrsave.
417 */
418 union {
419 elf_vrreg_t reg;
420 u32 word;
421 } vrsave;
422 memset(&vrsave, 0, sizeof(vrsave));
423 vrsave.word = target->thread.vrsave;
424 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &vrsave,
425 33 * sizeof(vector128), -1);
426 }
427
428 return ret;
429 }
430
431 static int vr_set(struct task_struct *target, const struct user_regset *regset,
432 unsigned int pos, unsigned int count,
433 const void *kbuf, const void __user *ubuf)
434 {
435 int ret;
436
437 flush_altivec_to_thread(target);
438
439 BUILD_BUG_ON(offsetof(struct thread_struct, vscr) !=
440 offsetof(struct thread_struct, vr[32]));
441
442 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
443 &target->thread.vr, 0, 33 * sizeof(vector128));
444 if (!ret && count > 0) {
445 /*
446 * We use only the first word of vrsave.
447 */
448 union {
449 elf_vrreg_t reg;
450 u32 word;
451 } vrsave;
452 memset(&vrsave, 0, sizeof(vrsave));
453 vrsave.word = target->thread.vrsave;
454 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &vrsave,
455 33 * sizeof(vector128), -1);
456 if (!ret)
457 target->thread.vrsave = vrsave.word;
458 }
459
460 return ret;
461 }
462 #endif /* CONFIG_ALTIVEC */
463
464 #ifdef CONFIG_VSX
465 /*
466 * Currently to set and and get all the vsx state, you need to call
467 * the fp and VMX calls as well. This only get/sets the lower 32
468 * 128bit VSX registers.
469 */
470
471 static int vsr_active(struct task_struct *target,
472 const struct user_regset *regset)
473 {
474 flush_vsx_to_thread(target);
475 return target->thread.used_vsr ? regset->n : 0;
476 }
477
478 static int vsr_get(struct task_struct *target, const struct user_regset *regset,
479 unsigned int pos, unsigned int count,
480 void *kbuf, void __user *ubuf)
481 {
482 double buf[32];
483 int ret, i;
484
485 flush_vsx_to_thread(target);
486
487 for (i = 0; i < 32 ; i++)
488 buf[i] = target->thread.fpr[i][TS_VSRLOWOFFSET];
489 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
490 buf, 0, 32 * sizeof(double));
491
492 return ret;
493 }
494
495 static int vsr_set(struct task_struct *target, const struct user_regset *regset,
496 unsigned int pos, unsigned int count,
497 const void *kbuf, const void __user *ubuf)
498 {
499 double buf[32];
500 int ret,i;
501
502 flush_vsx_to_thread(target);
503
504 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
505 buf, 0, 32 * sizeof(double));
506 for (i = 0; i < 32 ; i++)
507 target->thread.fpr[i][TS_VSRLOWOFFSET] = buf[i];
508
509
510 return ret;
511 }
512 #endif /* CONFIG_VSX */
513
514 #ifdef CONFIG_SPE
515
516 /*
517 * For get_evrregs/set_evrregs functions 'data' has the following layout:
518 *
519 * struct {
520 * u32 evr[32];
521 * u64 acc;
522 * u32 spefscr;
523 * }
524 */
525
526 static int evr_active(struct task_struct *target,
527 const struct user_regset *regset)
528 {
529 flush_spe_to_thread(target);
530 return target->thread.used_spe ? regset->n : 0;
531 }
532
533 static int evr_get(struct task_struct *target, const struct user_regset *regset,
534 unsigned int pos, unsigned int count,
535 void *kbuf, void __user *ubuf)
536 {
537 int ret;
538
539 flush_spe_to_thread(target);
540
541 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
542 &target->thread.evr,
543 0, sizeof(target->thread.evr));
544
545 BUILD_BUG_ON(offsetof(struct thread_struct, acc) + sizeof(u64) !=
546 offsetof(struct thread_struct, spefscr));
547
548 if (!ret)
549 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
550 &target->thread.acc,
551 sizeof(target->thread.evr), -1);
552
553 return ret;
554 }
555
556 static int evr_set(struct task_struct *target, const struct user_regset *regset,
557 unsigned int pos, unsigned int count,
558 const void *kbuf, const void __user *ubuf)
559 {
560 int ret;
561
562 flush_spe_to_thread(target);
563
564 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
565 &target->thread.evr,
566 0, sizeof(target->thread.evr));
567
568 BUILD_BUG_ON(offsetof(struct thread_struct, acc) + sizeof(u64) !=
569 offsetof(struct thread_struct, spefscr));
570
571 if (!ret)
572 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
573 &target->thread.acc,
574 sizeof(target->thread.evr), -1);
575
576 return ret;
577 }
578 #endif /* CONFIG_SPE */
579
580
581 /*
582 * These are our native regset flavors.
583 */
584 enum powerpc_regset {
585 REGSET_GPR,
586 REGSET_FPR,
587 #ifdef CONFIG_ALTIVEC
588 REGSET_VMX,
589 #endif
590 #ifdef CONFIG_VSX
591 REGSET_VSX,
592 #endif
593 #ifdef CONFIG_SPE
594 REGSET_SPE,
595 #endif
596 };
597
598 static const struct user_regset native_regsets[] = {
599 [REGSET_GPR] = {
600 .core_note_type = NT_PRSTATUS, .n = ELF_NGREG,
601 .size = sizeof(long), .align = sizeof(long),
602 .get = gpr_get, .set = gpr_set
603 },
604 [REGSET_FPR] = {
605 .core_note_type = NT_PRFPREG, .n = ELF_NFPREG,
606 .size = sizeof(double), .align = sizeof(double),
607 .get = fpr_get, .set = fpr_set
608 },
609 #ifdef CONFIG_ALTIVEC
610 [REGSET_VMX] = {
611 .core_note_type = NT_PPC_VMX, .n = 34,
612 .size = sizeof(vector128), .align = sizeof(vector128),
613 .active = vr_active, .get = vr_get, .set = vr_set
614 },
615 #endif
616 #ifdef CONFIG_VSX
617 [REGSET_VSX] = {
618 .core_note_type = NT_PPC_VSX, .n = 32,
619 .size = sizeof(double), .align = sizeof(double),
620 .active = vsr_active, .get = vsr_get, .set = vsr_set
621 },
622 #endif
623 #ifdef CONFIG_SPE
624 [REGSET_SPE] = {
625 .n = 35,
626 .size = sizeof(u32), .align = sizeof(u32),
627 .active = evr_active, .get = evr_get, .set = evr_set
628 },
629 #endif
630 };
631
632 static const struct user_regset_view user_ppc_native_view = {
633 .name = UTS_MACHINE, .e_machine = ELF_ARCH, .ei_osabi = ELF_OSABI,
634 .regsets = native_regsets, .n = ARRAY_SIZE(native_regsets)
635 };
636
637 #ifdef CONFIG_PPC64
638 #include <linux/compat.h>
639
640 static int gpr32_get(struct task_struct *target,
641 const struct user_regset *regset,
642 unsigned int pos, unsigned int count,
643 void *kbuf, void __user *ubuf)
644 {
645 const unsigned long *regs = &target->thread.regs->gpr[0];
646 compat_ulong_t *k = kbuf;
647 compat_ulong_t __user *u = ubuf;
648 compat_ulong_t reg;
649 int i;
650
651 if (target->thread.regs == NULL)
652 return -EIO;
653
654 if (!FULL_REGS(target->thread.regs)) {
655 /* We have a partial register set. Fill 14-31 with bogus values */
656 for (i = 14; i < 32; i++)
657 target->thread.regs->gpr[i] = NV_REG_POISON;
658 }
659
660 pos /= sizeof(reg);
661 count /= sizeof(reg);
662
663 if (kbuf)
664 for (; count > 0 && pos < PT_MSR; --count)
665 *k++ = regs[pos++];
666 else
667 for (; count > 0 && pos < PT_MSR; --count)
668 if (__put_user((compat_ulong_t) regs[pos++], u++))
669 return -EFAULT;
670
671 if (count > 0 && pos == PT_MSR) {
672 reg = get_user_msr(target);
673 if (kbuf)
674 *k++ = reg;
675 else if (__put_user(reg, u++))
676 return -EFAULT;
677 ++pos;
678 --count;
679 }
680
681 if (kbuf)
682 for (; count > 0 && pos < PT_REGS_COUNT; --count)
683 *k++ = regs[pos++];
684 else
685 for (; count > 0 && pos < PT_REGS_COUNT; --count)
686 if (__put_user((compat_ulong_t) regs[pos++], u++))
687 return -EFAULT;
688
689 kbuf = k;
690 ubuf = u;
691 pos *= sizeof(reg);
692 count *= sizeof(reg);
693 return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
694 PT_REGS_COUNT * sizeof(reg), -1);
695 }
696
697 static int gpr32_set(struct task_struct *target,
698 const struct user_regset *regset,
699 unsigned int pos, unsigned int count,
700 const void *kbuf, const void __user *ubuf)
701 {
702 unsigned long *regs = &target->thread.regs->gpr[0];
703 const compat_ulong_t *k = kbuf;
704 const compat_ulong_t __user *u = ubuf;
705 compat_ulong_t reg;
706
707 if (target->thread.regs == NULL)
708 return -EIO;
709
710 CHECK_FULL_REGS(target->thread.regs);
711
712 pos /= sizeof(reg);
713 count /= sizeof(reg);
714
715 if (kbuf)
716 for (; count > 0 && pos < PT_MSR; --count)
717 regs[pos++] = *k++;
718 else
719 for (; count > 0 && pos < PT_MSR; --count) {
720 if (__get_user(reg, u++))
721 return -EFAULT;
722 regs[pos++] = reg;
723 }
724
725
726 if (count > 0 && pos == PT_MSR) {
727 if (kbuf)
728 reg = *k++;
729 else if (__get_user(reg, u++))
730 return -EFAULT;
731 set_user_msr(target, reg);
732 ++pos;
733 --count;
734 }
735
736 if (kbuf) {
737 for (; count > 0 && pos <= PT_MAX_PUT_REG; --count)
738 regs[pos++] = *k++;
739 for (; count > 0 && pos < PT_TRAP; --count, ++pos)
740 ++k;
741 } else {
742 for (; count > 0 && pos <= PT_MAX_PUT_REG; --count) {
743 if (__get_user(reg, u++))
744 return -EFAULT;
745 regs[pos++] = reg;
746 }
747 for (; count > 0 && pos < PT_TRAP; --count, ++pos)
748 if (__get_user(reg, u++))
749 return -EFAULT;
750 }
751
752 if (count > 0 && pos == PT_TRAP) {
753 if (kbuf)
754 reg = *k++;
755 else if (__get_user(reg, u++))
756 return -EFAULT;
757 set_user_trap(target, reg);
758 ++pos;
759 --count;
760 }
761
762 kbuf = k;
763 ubuf = u;
764 pos *= sizeof(reg);
765 count *= sizeof(reg);
766 return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
767 (PT_TRAP + 1) * sizeof(reg), -1);
768 }
769
770 /*
771 * These are the regset flavors matching the CONFIG_PPC32 native set.
772 */
773 static const struct user_regset compat_regsets[] = {
774 [REGSET_GPR] = {
775 .core_note_type = NT_PRSTATUS, .n = ELF_NGREG,
776 .size = sizeof(compat_long_t), .align = sizeof(compat_long_t),
777 .get = gpr32_get, .set = gpr32_set
778 },
779 [REGSET_FPR] = {
780 .core_note_type = NT_PRFPREG, .n = ELF_NFPREG,
781 .size = sizeof(double), .align = sizeof(double),
782 .get = fpr_get, .set = fpr_set
783 },
784 #ifdef CONFIG_ALTIVEC
785 [REGSET_VMX] = {
786 .core_note_type = NT_PPC_VMX, .n = 34,
787 .size = sizeof(vector128), .align = sizeof(vector128),
788 .active = vr_active, .get = vr_get, .set = vr_set
789 },
790 #endif
791 #ifdef CONFIG_SPE
792 [REGSET_SPE] = {
793 .core_note_type = NT_PPC_SPE, .n = 35,
794 .size = sizeof(u32), .align = sizeof(u32),
795 .active = evr_active, .get = evr_get, .set = evr_set
796 },
797 #endif
798 };
799
800 static const struct user_regset_view user_ppc_compat_view = {
801 .name = "ppc", .e_machine = EM_PPC, .ei_osabi = ELF_OSABI,
802 .regsets = compat_regsets, .n = ARRAY_SIZE(compat_regsets)
803 };
804 #endif /* CONFIG_PPC64 */
805
806 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
807 {
808 #ifdef CONFIG_PPC64
809 if (test_tsk_thread_flag(task, TIF_32BIT))
810 return &user_ppc_compat_view;
811 #endif
812 return &user_ppc_native_view;
813 }
814
815
816 void user_enable_single_step(struct task_struct *task)
817 {
818 struct pt_regs *regs = task->thread.regs;
819
820 if (regs != NULL) {
821 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
822 task->thread.dbcr0 &= ~DBCR0_BT;
823 task->thread.dbcr0 |= DBCR0_IDM | DBCR0_IC;
824 regs->msr |= MSR_DE;
825 #else
826 regs->msr &= ~MSR_BE;
827 regs->msr |= MSR_SE;
828 #endif
829 }
830 set_tsk_thread_flag(task, TIF_SINGLESTEP);
831 }
832
833 void user_enable_block_step(struct task_struct *task)
834 {
835 struct pt_regs *regs = task->thread.regs;
836
837 if (regs != NULL) {
838 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
839 task->thread.dbcr0 &= ~DBCR0_IC;
840 task->thread.dbcr0 = DBCR0_IDM | DBCR0_BT;
841 regs->msr |= MSR_DE;
842 #else
843 regs->msr &= ~MSR_SE;
844 regs->msr |= MSR_BE;
845 #endif
846 }
847 set_tsk_thread_flag(task, TIF_SINGLESTEP);
848 }
849
850 void user_disable_single_step(struct task_struct *task)
851 {
852 struct pt_regs *regs = task->thread.regs;
853
854 if (regs != NULL) {
855 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
856 /*
857 * The logic to disable single stepping should be as
858 * simple as turning off the Instruction Complete flag.
859 * And, after doing so, if all debug flags are off, turn
860 * off DBCR0(IDM) and MSR(DE) .... Torez
861 */
862 task->thread.dbcr0 &= ~DBCR0_IC;
863 /*
864 * Test to see if any of the DBCR_ACTIVE_EVENTS bits are set.
865 */
866 if (!DBCR_ACTIVE_EVENTS(task->thread.dbcr0,
867 task->thread.dbcr1)) {
868 /*
869 * All debug events were off.....
870 */
871 task->thread.dbcr0 &= ~DBCR0_IDM;
872 regs->msr &= ~MSR_DE;
873 }
874 #else
875 regs->msr &= ~(MSR_SE | MSR_BE);
876 #endif
877 }
878 clear_tsk_thread_flag(task, TIF_SINGLESTEP);
879 }
880
881 #ifdef CONFIG_HAVE_HW_BREAKPOINT
882 void ptrace_triggered(struct perf_event *bp,
883 struct perf_sample_data *data, struct pt_regs *regs)
884 {
885 struct perf_event_attr attr;
886
887 /*
888 * Disable the breakpoint request here since ptrace has defined a
889 * one-shot behaviour for breakpoint exceptions in PPC64.
890 * The SIGTRAP signal is generated automatically for us in do_dabr().
891 * We don't have to do anything about that here
892 */
893 attr = bp->attr;
894 attr.disabled = true;
895 modify_user_hw_breakpoint(bp, &attr);
896 }
897 #endif /* CONFIG_HAVE_HW_BREAKPOINT */
898
899 int ptrace_set_debugreg(struct task_struct *task, unsigned long addr,
900 unsigned long data)
901 {
902 #ifdef CONFIG_HAVE_HW_BREAKPOINT
903 int ret;
904 struct thread_struct *thread = &(task->thread);
905 struct perf_event *bp;
906 struct perf_event_attr attr;
907 #endif /* CONFIG_HAVE_HW_BREAKPOINT */
908
909 /* For ppc64 we support one DABR and no IABR's at the moment (ppc64).
910 * For embedded processors we support one DAC and no IAC's at the
911 * moment.
912 */
913 if (addr > 0)
914 return -EINVAL;
915
916 /* The bottom 3 bits in dabr are flags */
917 if ((data & ~0x7UL) >= TASK_SIZE)
918 return -EIO;
919
920 #ifndef CONFIG_PPC_ADV_DEBUG_REGS
921 /* For processors using DABR (i.e. 970), the bottom 3 bits are flags.
922 * It was assumed, on previous implementations, that 3 bits were
923 * passed together with the data address, fitting the design of the
924 * DABR register, as follows:
925 *
926 * bit 0: Read flag
927 * bit 1: Write flag
928 * bit 2: Breakpoint translation
929 *
930 * Thus, we use them here as so.
931 */
932
933 /* Ensure breakpoint translation bit is set */
934 if (data && !(data & DABR_TRANSLATION))
935 return -EIO;
936 #ifdef CONFIG_HAVE_HW_BREAKPOINT
937 if (ptrace_get_breakpoints(task) < 0)
938 return -ESRCH;
939
940 bp = thread->ptrace_bps[0];
941 if ((!data) || !(data & (DABR_DATA_WRITE | DABR_DATA_READ))) {
942 if (bp) {
943 unregister_hw_breakpoint(bp);
944 thread->ptrace_bps[0] = NULL;
945 }
946 ptrace_put_breakpoints(task);
947 return 0;
948 }
949 if (bp) {
950 attr = bp->attr;
951 attr.bp_addr = data & ~HW_BREAKPOINT_ALIGN;
952 arch_bp_generic_fields(data &
953 (DABR_DATA_WRITE | DABR_DATA_READ),
954 &attr.bp_type);
955 ret = modify_user_hw_breakpoint(bp, &attr);
956 if (ret) {
957 ptrace_put_breakpoints(task);
958 return ret;
959 }
960 thread->ptrace_bps[0] = bp;
961 ptrace_put_breakpoints(task);
962 thread->dabr = data;
963 return 0;
964 }
965
966 /* Create a new breakpoint request if one doesn't exist already */
967 hw_breakpoint_init(&attr);
968 attr.bp_addr = data & ~HW_BREAKPOINT_ALIGN;
969 arch_bp_generic_fields(data & (DABR_DATA_WRITE | DABR_DATA_READ),
970 &attr.bp_type);
971
972 thread->ptrace_bps[0] = bp = register_user_hw_breakpoint(&attr,
973 ptrace_triggered, NULL, task);
974 if (IS_ERR(bp)) {
975 thread->ptrace_bps[0] = NULL;
976 ptrace_put_breakpoints(task);
977 return PTR_ERR(bp);
978 }
979
980 ptrace_put_breakpoints(task);
981
982 #endif /* CONFIG_HAVE_HW_BREAKPOINT */
983
984 /* Move contents to the DABR register */
985 task->thread.dabr = data;
986 #else /* CONFIG_PPC_ADV_DEBUG_REGS */
987 /* As described above, it was assumed 3 bits were passed with the data
988 * address, but we will assume only the mode bits will be passed
989 * as to not cause alignment restrictions for DAC-based processors.
990 */
991
992 /* DAC's hold the whole address without any mode flags */
993 task->thread.dac1 = data & ~0x3UL;
994
995 if (task->thread.dac1 == 0) {
996 dbcr_dac(task) &= ~(DBCR_DAC1R | DBCR_DAC1W);
997 if (!DBCR_ACTIVE_EVENTS(task->thread.dbcr0,
998 task->thread.dbcr1)) {
999 task->thread.regs->msr &= ~MSR_DE;
1000 task->thread.dbcr0 &= ~DBCR0_IDM;
1001 }
1002 return 0;
1003 }
1004
1005 /* Read or Write bits must be set */
1006
1007 if (!(data & 0x3UL))
1008 return -EINVAL;
1009
1010 /* Set the Internal Debugging flag (IDM bit 1) for the DBCR0
1011 register */
1012 task->thread.dbcr0 |= DBCR0_IDM;
1013
1014 /* Check for write and read flags and set DBCR0
1015 accordingly */
1016 dbcr_dac(task) &= ~(DBCR_DAC1R|DBCR_DAC1W);
1017 if (data & 0x1UL)
1018 dbcr_dac(task) |= DBCR_DAC1R;
1019 if (data & 0x2UL)
1020 dbcr_dac(task) |= DBCR_DAC1W;
1021 task->thread.regs->msr |= MSR_DE;
1022 #endif /* CONFIG_PPC_ADV_DEBUG_REGS */
1023 return 0;
1024 }
1025
1026 /*
1027 * Called by kernel/ptrace.c when detaching..
1028 *
1029 * Make sure single step bits etc are not set.
1030 */
1031 void ptrace_disable(struct task_struct *child)
1032 {
1033 /* make sure the single step bit is not set. */
1034 user_disable_single_step(child);
1035 }
1036
1037 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
1038 static long set_intruction_bp(struct task_struct *child,
1039 struct ppc_hw_breakpoint *bp_info)
1040 {
1041 int slot;
1042 int slot1_in_use = ((child->thread.dbcr0 & DBCR0_IAC1) != 0);
1043 int slot2_in_use = ((child->thread.dbcr0 & DBCR0_IAC2) != 0);
1044 int slot3_in_use = ((child->thread.dbcr0 & DBCR0_IAC3) != 0);
1045 int slot4_in_use = ((child->thread.dbcr0 & DBCR0_IAC4) != 0);
1046
1047 if (dbcr_iac_range(child) & DBCR_IAC12MODE)
1048 slot2_in_use = 1;
1049 if (dbcr_iac_range(child) & DBCR_IAC34MODE)
1050 slot4_in_use = 1;
1051
1052 if (bp_info->addr >= TASK_SIZE)
1053 return -EIO;
1054
1055 if (bp_info->addr_mode != PPC_BREAKPOINT_MODE_EXACT) {
1056
1057 /* Make sure range is valid. */
1058 if (bp_info->addr2 >= TASK_SIZE)
1059 return -EIO;
1060
1061 /* We need a pair of IAC regsisters */
1062 if ((!slot1_in_use) && (!slot2_in_use)) {
1063 slot = 1;
1064 child->thread.iac1 = bp_info->addr;
1065 child->thread.iac2 = bp_info->addr2;
1066 child->thread.dbcr0 |= DBCR0_IAC1;
1067 if (bp_info->addr_mode ==
1068 PPC_BREAKPOINT_MODE_RANGE_EXCLUSIVE)
1069 dbcr_iac_range(child) |= DBCR_IAC12X;
1070 else
1071 dbcr_iac_range(child) |= DBCR_IAC12I;
1072 #if CONFIG_PPC_ADV_DEBUG_IACS > 2
1073 } else if ((!slot3_in_use) && (!slot4_in_use)) {
1074 slot = 3;
1075 child->thread.iac3 = bp_info->addr;
1076 child->thread.iac4 = bp_info->addr2;
1077 child->thread.dbcr0 |= DBCR0_IAC3;
1078 if (bp_info->addr_mode ==
1079 PPC_BREAKPOINT_MODE_RANGE_EXCLUSIVE)
1080 dbcr_iac_range(child) |= DBCR_IAC34X;
1081 else
1082 dbcr_iac_range(child) |= DBCR_IAC34I;
1083 #endif
1084 } else
1085 return -ENOSPC;
1086 } else {
1087 /* We only need one. If possible leave a pair free in
1088 * case a range is needed later
1089 */
1090 if (!slot1_in_use) {
1091 /*
1092 * Don't use iac1 if iac1-iac2 are free and either
1093 * iac3 or iac4 (but not both) are free
1094 */
1095 if (slot2_in_use || (slot3_in_use == slot4_in_use)) {
1096 slot = 1;
1097 child->thread.iac1 = bp_info->addr;
1098 child->thread.dbcr0 |= DBCR0_IAC1;
1099 goto out;
1100 }
1101 }
1102 if (!slot2_in_use) {
1103 slot = 2;
1104 child->thread.iac2 = bp_info->addr;
1105 child->thread.dbcr0 |= DBCR0_IAC2;
1106 #if CONFIG_PPC_ADV_DEBUG_IACS > 2
1107 } else if (!slot3_in_use) {
1108 slot = 3;
1109 child->thread.iac3 = bp_info->addr;
1110 child->thread.dbcr0 |= DBCR0_IAC3;
1111 } else if (!slot4_in_use) {
1112 slot = 4;
1113 child->thread.iac4 = bp_info->addr;
1114 child->thread.dbcr0 |= DBCR0_IAC4;
1115 #endif
1116 } else
1117 return -ENOSPC;
1118 }
1119 out:
1120 child->thread.dbcr0 |= DBCR0_IDM;
1121 child->thread.regs->msr |= MSR_DE;
1122
1123 return slot;
1124 }
1125
1126 static int del_instruction_bp(struct task_struct *child, int slot)
1127 {
1128 switch (slot) {
1129 case 1:
1130 if ((child->thread.dbcr0 & DBCR0_IAC1) == 0)
1131 return -ENOENT;
1132
1133 if (dbcr_iac_range(child) & DBCR_IAC12MODE) {
1134 /* address range - clear slots 1 & 2 */
1135 child->thread.iac2 = 0;
1136 dbcr_iac_range(child) &= ~DBCR_IAC12MODE;
1137 }
1138 child->thread.iac1 = 0;
1139 child->thread.dbcr0 &= ~DBCR0_IAC1;
1140 break;
1141 case 2:
1142 if ((child->thread.dbcr0 & DBCR0_IAC2) == 0)
1143 return -ENOENT;
1144
1145 if (dbcr_iac_range(child) & DBCR_IAC12MODE)
1146 /* used in a range */
1147 return -EINVAL;
1148 child->thread.iac2 = 0;
1149 child->thread.dbcr0 &= ~DBCR0_IAC2;
1150 break;
1151 #if CONFIG_PPC_ADV_DEBUG_IACS > 2
1152 case 3:
1153 if ((child->thread.dbcr0 & DBCR0_IAC3) == 0)
1154 return -ENOENT;
1155
1156 if (dbcr_iac_range(child) & DBCR_IAC34MODE) {
1157 /* address range - clear slots 3 & 4 */
1158 child->thread.iac4 = 0;
1159 dbcr_iac_range(child) &= ~DBCR_IAC34MODE;
1160 }
1161 child->thread.iac3 = 0;
1162 child->thread.dbcr0 &= ~DBCR0_IAC3;
1163 break;
1164 case 4:
1165 if ((child->thread.dbcr0 & DBCR0_IAC4) == 0)
1166 return -ENOENT;
1167
1168 if (dbcr_iac_range(child) & DBCR_IAC34MODE)
1169 /* Used in a range */
1170 return -EINVAL;
1171 child->thread.iac4 = 0;
1172 child->thread.dbcr0 &= ~DBCR0_IAC4;
1173 break;
1174 #endif
1175 default:
1176 return -EINVAL;
1177 }
1178 return 0;
1179 }
1180
1181 static int set_dac(struct task_struct *child, struct ppc_hw_breakpoint *bp_info)
1182 {
1183 int byte_enable =
1184 (bp_info->condition_mode >> PPC_BREAKPOINT_CONDITION_BE_SHIFT)
1185 & 0xf;
1186 int condition_mode =
1187 bp_info->condition_mode & PPC_BREAKPOINT_CONDITION_MODE;
1188 int slot;
1189
1190 if (byte_enable && (condition_mode == 0))
1191 return -EINVAL;
1192
1193 if (bp_info->addr >= TASK_SIZE)
1194 return -EIO;
1195
1196 if ((dbcr_dac(child) & (DBCR_DAC1R | DBCR_DAC1W)) == 0) {
1197 slot = 1;
1198 if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_READ)
1199 dbcr_dac(child) |= DBCR_DAC1R;
1200 if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_WRITE)
1201 dbcr_dac(child) |= DBCR_DAC1W;
1202 child->thread.dac1 = (unsigned long)bp_info->addr;
1203 #if CONFIG_PPC_ADV_DEBUG_DVCS > 0
1204 if (byte_enable) {
1205 child->thread.dvc1 =
1206 (unsigned long)bp_info->condition_value;
1207 child->thread.dbcr2 |=
1208 ((byte_enable << DBCR2_DVC1BE_SHIFT) |
1209 (condition_mode << DBCR2_DVC1M_SHIFT));
1210 }
1211 #endif
1212 #ifdef CONFIG_PPC_ADV_DEBUG_DAC_RANGE
1213 } else if (child->thread.dbcr2 & DBCR2_DAC12MODE) {
1214 /* Both dac1 and dac2 are part of a range */
1215 return -ENOSPC;
1216 #endif
1217 } else if ((dbcr_dac(child) & (DBCR_DAC2R | DBCR_DAC2W)) == 0) {
1218 slot = 2;
1219 if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_READ)
1220 dbcr_dac(child) |= DBCR_DAC2R;
1221 if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_WRITE)
1222 dbcr_dac(child) |= DBCR_DAC2W;
1223 child->thread.dac2 = (unsigned long)bp_info->addr;
1224 #if CONFIG_PPC_ADV_DEBUG_DVCS > 0
1225 if (byte_enable) {
1226 child->thread.dvc2 =
1227 (unsigned long)bp_info->condition_value;
1228 child->thread.dbcr2 |=
1229 ((byte_enable << DBCR2_DVC2BE_SHIFT) |
1230 (condition_mode << DBCR2_DVC2M_SHIFT));
1231 }
1232 #endif
1233 } else
1234 return -ENOSPC;
1235 child->thread.dbcr0 |= DBCR0_IDM;
1236 child->thread.regs->msr |= MSR_DE;
1237
1238 return slot + 4;
1239 }
1240
1241 static int del_dac(struct task_struct *child, int slot)
1242 {
1243 if (slot == 1) {
1244 if ((dbcr_dac(child) & (DBCR_DAC1R | DBCR_DAC1W)) == 0)
1245 return -ENOENT;
1246
1247 child->thread.dac1 = 0;
1248 dbcr_dac(child) &= ~(DBCR_DAC1R | DBCR_DAC1W);
1249 #ifdef CONFIG_PPC_ADV_DEBUG_DAC_RANGE
1250 if (child->thread.dbcr2 & DBCR2_DAC12MODE) {
1251 child->thread.dac2 = 0;
1252 child->thread.dbcr2 &= ~DBCR2_DAC12MODE;
1253 }
1254 child->thread.dbcr2 &= ~(DBCR2_DVC1M | DBCR2_DVC1BE);
1255 #endif
1256 #if CONFIG_PPC_ADV_DEBUG_DVCS > 0
1257 child->thread.dvc1 = 0;
1258 #endif
1259 } else if (slot == 2) {
1260 if ((dbcr_dac(child) & (DBCR_DAC2R | DBCR_DAC2W)) == 0)
1261 return -ENOENT;
1262
1263 #ifdef CONFIG_PPC_ADV_DEBUG_DAC_RANGE
1264 if (child->thread.dbcr2 & DBCR2_DAC12MODE)
1265 /* Part of a range */
1266 return -EINVAL;
1267 child->thread.dbcr2 &= ~(DBCR2_DVC2M | DBCR2_DVC2BE);
1268 #endif
1269 #if CONFIG_PPC_ADV_DEBUG_DVCS > 0
1270 child->thread.dvc2 = 0;
1271 #endif
1272 child->thread.dac2 = 0;
1273 dbcr_dac(child) &= ~(DBCR_DAC2R | DBCR_DAC2W);
1274 } else
1275 return -EINVAL;
1276
1277 return 0;
1278 }
1279 #endif /* CONFIG_PPC_ADV_DEBUG_REGS */
1280
1281 #ifdef CONFIG_PPC_ADV_DEBUG_DAC_RANGE
1282 static int set_dac_range(struct task_struct *child,
1283 struct ppc_hw_breakpoint *bp_info)
1284 {
1285 int mode = bp_info->addr_mode & PPC_BREAKPOINT_MODE_MASK;
1286
1287 /* We don't allow range watchpoints to be used with DVC */
1288 if (bp_info->condition_mode)
1289 return -EINVAL;
1290
1291 /*
1292 * Best effort to verify the address range. The user/supervisor bits
1293 * prevent trapping in kernel space, but let's fail on an obvious bad
1294 * range. The simple test on the mask is not fool-proof, and any
1295 * exclusive range will spill over into kernel space.
1296 */
1297 if (bp_info->addr >= TASK_SIZE)
1298 return -EIO;
1299 if (mode == PPC_BREAKPOINT_MODE_MASK) {
1300 /*
1301 * dac2 is a bitmask. Don't allow a mask that makes a
1302 * kernel space address from a valid dac1 value
1303 */
1304 if (~((unsigned long)bp_info->addr2) >= TASK_SIZE)
1305 return -EIO;
1306 } else {
1307 /*
1308 * For range breakpoints, addr2 must also be a valid address
1309 */
1310 if (bp_info->addr2 >= TASK_SIZE)
1311 return -EIO;
1312 }
1313
1314 if (child->thread.dbcr0 &
1315 (DBCR0_DAC1R | DBCR0_DAC1W | DBCR0_DAC2R | DBCR0_DAC2W))
1316 return -ENOSPC;
1317
1318 if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_READ)
1319 child->thread.dbcr0 |= (DBCR0_DAC1R | DBCR0_IDM);
1320 if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_WRITE)
1321 child->thread.dbcr0 |= (DBCR0_DAC1W | DBCR0_IDM);
1322 child->thread.dac1 = bp_info->addr;
1323 child->thread.dac2 = bp_info->addr2;
1324 if (mode == PPC_BREAKPOINT_MODE_RANGE_INCLUSIVE)
1325 child->thread.dbcr2 |= DBCR2_DAC12M;
1326 else if (mode == PPC_BREAKPOINT_MODE_RANGE_EXCLUSIVE)
1327 child->thread.dbcr2 |= DBCR2_DAC12MX;
1328 else /* PPC_BREAKPOINT_MODE_MASK */
1329 child->thread.dbcr2 |= DBCR2_DAC12MM;
1330 child->thread.regs->msr |= MSR_DE;
1331
1332 return 5;
1333 }
1334 #endif /* CONFIG_PPC_ADV_DEBUG_DAC_RANGE */
1335
1336 static long ppc_set_hwdebug(struct task_struct *child,
1337 struct ppc_hw_breakpoint *bp_info)
1338 {
1339 #ifndef CONFIG_PPC_ADV_DEBUG_REGS
1340 unsigned long dabr;
1341 #endif
1342
1343 if (bp_info->version != 1)
1344 return -ENOTSUPP;
1345 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
1346 /*
1347 * Check for invalid flags and combinations
1348 */
1349 if ((bp_info->trigger_type == 0) ||
1350 (bp_info->trigger_type & ~(PPC_BREAKPOINT_TRIGGER_EXECUTE |
1351 PPC_BREAKPOINT_TRIGGER_RW)) ||
1352 (bp_info->addr_mode & ~PPC_BREAKPOINT_MODE_MASK) ||
1353 (bp_info->condition_mode &
1354 ~(PPC_BREAKPOINT_CONDITION_MODE |
1355 PPC_BREAKPOINT_CONDITION_BE_ALL)))
1356 return -EINVAL;
1357 #if CONFIG_PPC_ADV_DEBUG_DVCS == 0
1358 if (bp_info->condition_mode != PPC_BREAKPOINT_CONDITION_NONE)
1359 return -EINVAL;
1360 #endif
1361
1362 if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_EXECUTE) {
1363 if ((bp_info->trigger_type != PPC_BREAKPOINT_TRIGGER_EXECUTE) ||
1364 (bp_info->condition_mode != PPC_BREAKPOINT_CONDITION_NONE))
1365 return -EINVAL;
1366 return set_intruction_bp(child, bp_info);
1367 }
1368 if (bp_info->addr_mode == PPC_BREAKPOINT_MODE_EXACT)
1369 return set_dac(child, bp_info);
1370
1371 #ifdef CONFIG_PPC_ADV_DEBUG_DAC_RANGE
1372 return set_dac_range(child, bp_info);
1373 #else
1374 return -EINVAL;
1375 #endif
1376 #else /* !CONFIG_PPC_ADV_DEBUG_DVCS */
1377 /*
1378 * We only support one data breakpoint
1379 */
1380 if ((bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_RW) == 0 ||
1381 (bp_info->trigger_type & ~PPC_BREAKPOINT_TRIGGER_RW) != 0 ||
1382 bp_info->addr_mode != PPC_BREAKPOINT_MODE_EXACT ||
1383 bp_info->condition_mode != PPC_BREAKPOINT_CONDITION_NONE)
1384 return -EINVAL;
1385
1386 if (child->thread.dabr)
1387 return -ENOSPC;
1388
1389 if ((unsigned long)bp_info->addr >= TASK_SIZE)
1390 return -EIO;
1391
1392 dabr = (unsigned long)bp_info->addr & ~7UL;
1393 dabr |= DABR_TRANSLATION;
1394 if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_READ)
1395 dabr |= DABR_DATA_READ;
1396 if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_WRITE)
1397 dabr |= DABR_DATA_WRITE;
1398
1399 child->thread.dabr = dabr;
1400
1401 return 1;
1402 #endif /* !CONFIG_PPC_ADV_DEBUG_DVCS */
1403 }
1404
1405 static long ppc_del_hwdebug(struct task_struct *child, long addr, long data)
1406 {
1407 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
1408 int rc;
1409
1410 if (data <= 4)
1411 rc = del_instruction_bp(child, (int)data);
1412 else
1413 rc = del_dac(child, (int)data - 4);
1414
1415 if (!rc) {
1416 if (!DBCR_ACTIVE_EVENTS(child->thread.dbcr0,
1417 child->thread.dbcr1)) {
1418 child->thread.dbcr0 &= ~DBCR0_IDM;
1419 child->thread.regs->msr &= ~MSR_DE;
1420 }
1421 }
1422 return rc;
1423 #else
1424 if (data != 1)
1425 return -EINVAL;
1426 if (child->thread.dabr == 0)
1427 return -ENOENT;
1428
1429 child->thread.dabr = 0;
1430
1431 return 0;
1432 #endif
1433 }
1434
1435 /*
1436 * Here are the old "legacy" powerpc specific getregs/setregs ptrace calls,
1437 * we mark them as obsolete now, they will be removed in a future version
1438 */
1439 static long arch_ptrace_old(struct task_struct *child, long request,
1440 unsigned long addr, unsigned long data)
1441 {
1442 void __user *datavp = (void __user *) data;
1443
1444 switch (request) {
1445 case PPC_PTRACE_GETREGS: /* Get GPRs 0 - 31. */
1446 return copy_regset_to_user(child, &user_ppc_native_view,
1447 REGSET_GPR, 0, 32 * sizeof(long),
1448 datavp);
1449
1450 case PPC_PTRACE_SETREGS: /* Set GPRs 0 - 31. */
1451 return copy_regset_from_user(child, &user_ppc_native_view,
1452 REGSET_GPR, 0, 32 * sizeof(long),
1453 datavp);
1454
1455 case PPC_PTRACE_GETFPREGS: /* Get FPRs 0 - 31. */
1456 return copy_regset_to_user(child, &user_ppc_native_view,
1457 REGSET_FPR, 0, 32 * sizeof(double),
1458 datavp);
1459
1460 case PPC_PTRACE_SETFPREGS: /* Set FPRs 0 - 31. */
1461 return copy_regset_from_user(child, &user_ppc_native_view,
1462 REGSET_FPR, 0, 32 * sizeof(double),
1463 datavp);
1464 }
1465
1466 return -EPERM;
1467 }
1468
1469 long arch_ptrace(struct task_struct *child, long request,
1470 unsigned long addr, unsigned long data)
1471 {
1472 int ret = -EPERM;
1473 void __user *datavp = (void __user *) data;
1474 unsigned long __user *datalp = datavp;
1475
1476 switch (request) {
1477 /* read the word at location addr in the USER area. */
1478 case PTRACE_PEEKUSR: {
1479 unsigned long index, tmp;
1480
1481 ret = -EIO;
1482 /* convert to index and check */
1483 #ifdef CONFIG_PPC32
1484 index = addr >> 2;
1485 if ((addr & 3) || (index > PT_FPSCR)
1486 || (child->thread.regs == NULL))
1487 #else
1488 index = addr >> 3;
1489 if ((addr & 7) || (index > PT_FPSCR))
1490 #endif
1491 break;
1492
1493 CHECK_FULL_REGS(child->thread.regs);
1494 if (index < PT_FPR0) {
1495 tmp = ptrace_get_reg(child, (int) index);
1496 } else {
1497 unsigned int fpidx = index - PT_FPR0;
1498
1499 flush_fp_to_thread(child);
1500 if (fpidx < (PT_FPSCR - PT_FPR0))
1501 tmp = ((unsigned long *)child->thread.fpr)
1502 [fpidx * TS_FPRWIDTH];
1503 else
1504 tmp = child->thread.fpscr.val;
1505 }
1506 ret = put_user(tmp, datalp);
1507 break;
1508 }
1509
1510 /* write the word at location addr in the USER area */
1511 case PTRACE_POKEUSR: {
1512 unsigned long index;
1513
1514 ret = -EIO;
1515 /* convert to index and check */
1516 #ifdef CONFIG_PPC32
1517 index = addr >> 2;
1518 if ((addr & 3) || (index > PT_FPSCR)
1519 || (child->thread.regs == NULL))
1520 #else
1521 index = addr >> 3;
1522 if ((addr & 7) || (index > PT_FPSCR))
1523 #endif
1524 break;
1525
1526 CHECK_FULL_REGS(child->thread.regs);
1527 if (index < PT_FPR0) {
1528 ret = ptrace_put_reg(child, index, data);
1529 } else {
1530 unsigned int fpidx = index - PT_FPR0;
1531
1532 flush_fp_to_thread(child);
1533 if (fpidx < (PT_FPSCR - PT_FPR0))
1534 ((unsigned long *)child->thread.fpr)
1535 [fpidx * TS_FPRWIDTH] = data;
1536 else
1537 child->thread.fpscr.val = data;
1538 ret = 0;
1539 }
1540 break;
1541 }
1542
1543 case PPC_PTRACE_GETHWDBGINFO: {
1544 struct ppc_debug_info dbginfo;
1545
1546 dbginfo.version = 1;
1547 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
1548 dbginfo.num_instruction_bps = CONFIG_PPC_ADV_DEBUG_IACS;
1549 dbginfo.num_data_bps = CONFIG_PPC_ADV_DEBUG_DACS;
1550 dbginfo.num_condition_regs = CONFIG_PPC_ADV_DEBUG_DVCS;
1551 dbginfo.data_bp_alignment = 4;
1552 dbginfo.sizeof_condition = 4;
1553 dbginfo.features = PPC_DEBUG_FEATURE_INSN_BP_RANGE |
1554 PPC_DEBUG_FEATURE_INSN_BP_MASK;
1555 #ifdef CONFIG_PPC_ADV_DEBUG_DAC_RANGE
1556 dbginfo.features |=
1557 PPC_DEBUG_FEATURE_DATA_BP_RANGE |
1558 PPC_DEBUG_FEATURE_DATA_BP_MASK;
1559 #endif
1560 #else /* !CONFIG_PPC_ADV_DEBUG_REGS */
1561 dbginfo.num_instruction_bps = 0;
1562 dbginfo.num_data_bps = 1;
1563 dbginfo.num_condition_regs = 0;
1564 #ifdef CONFIG_PPC64
1565 dbginfo.data_bp_alignment = 8;
1566 #else
1567 dbginfo.data_bp_alignment = 4;
1568 #endif
1569 dbginfo.sizeof_condition = 0;
1570 dbginfo.features = 0;
1571 #endif /* CONFIG_PPC_ADV_DEBUG_REGS */
1572
1573 if (!access_ok(VERIFY_WRITE, datavp,
1574 sizeof(struct ppc_debug_info)))
1575 return -EFAULT;
1576 ret = __copy_to_user(datavp, &dbginfo,
1577 sizeof(struct ppc_debug_info)) ?
1578 -EFAULT : 0;
1579 break;
1580 }
1581
1582 case PPC_PTRACE_SETHWDEBUG: {
1583 struct ppc_hw_breakpoint bp_info;
1584
1585 if (!access_ok(VERIFY_READ, datavp,
1586 sizeof(struct ppc_hw_breakpoint)))
1587 return -EFAULT;
1588 ret = __copy_from_user(&bp_info, datavp,
1589 sizeof(struct ppc_hw_breakpoint)) ?
1590 -EFAULT : 0;
1591 if (!ret)
1592 ret = ppc_set_hwdebug(child, &bp_info);
1593 break;
1594 }
1595
1596 case PPC_PTRACE_DELHWDEBUG: {
1597 ret = ppc_del_hwdebug(child, addr, data);
1598 break;
1599 }
1600
1601 case PTRACE_GET_DEBUGREG: {
1602 ret = -EINVAL;
1603 /* We only support one DABR and no IABRS at the moment */
1604 if (addr > 0)
1605 break;
1606 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
1607 ret = put_user(child->thread.dac1, datalp);
1608 #else
1609 ret = put_user(child->thread.dabr, datalp);
1610 #endif
1611 break;
1612 }
1613
1614 case PTRACE_SET_DEBUGREG:
1615 ret = ptrace_set_debugreg(child, addr, data);
1616 break;
1617
1618 #ifdef CONFIG_PPC64
1619 case PTRACE_GETREGS64:
1620 #endif
1621 case PTRACE_GETREGS: /* Get all pt_regs from the child. */
1622 return copy_regset_to_user(child, &user_ppc_native_view,
1623 REGSET_GPR,
1624 0, sizeof(struct pt_regs),
1625 datavp);
1626
1627 #ifdef CONFIG_PPC64
1628 case PTRACE_SETREGS64:
1629 #endif
1630 case PTRACE_SETREGS: /* Set all gp regs in the child. */
1631 return copy_regset_from_user(child, &user_ppc_native_view,
1632 REGSET_GPR,
1633 0, sizeof(struct pt_regs),
1634 datavp);
1635
1636 case PTRACE_GETFPREGS: /* Get the child FPU state (FPR0...31 + FPSCR) */
1637 return copy_regset_to_user(child, &user_ppc_native_view,
1638 REGSET_FPR,
1639 0, sizeof(elf_fpregset_t),
1640 datavp);
1641
1642 case PTRACE_SETFPREGS: /* Set the child FPU state (FPR0...31 + FPSCR) */
1643 return copy_regset_from_user(child, &user_ppc_native_view,
1644 REGSET_FPR,
1645 0, sizeof(elf_fpregset_t),
1646 datavp);
1647
1648 #ifdef CONFIG_ALTIVEC
1649 case PTRACE_GETVRREGS:
1650 return copy_regset_to_user(child, &user_ppc_native_view,
1651 REGSET_VMX,
1652 0, (33 * sizeof(vector128) +
1653 sizeof(u32)),
1654 datavp);
1655
1656 case PTRACE_SETVRREGS:
1657 return copy_regset_from_user(child, &user_ppc_native_view,
1658 REGSET_VMX,
1659 0, (33 * sizeof(vector128) +
1660 sizeof(u32)),
1661 datavp);
1662 #endif
1663 #ifdef CONFIG_VSX
1664 case PTRACE_GETVSRREGS:
1665 return copy_regset_to_user(child, &user_ppc_native_view,
1666 REGSET_VSX,
1667 0, 32 * sizeof(double),
1668 datavp);
1669
1670 case PTRACE_SETVSRREGS:
1671 return copy_regset_from_user(child, &user_ppc_native_view,
1672 REGSET_VSX,
1673 0, 32 * sizeof(double),
1674 datavp);
1675 #endif
1676 #ifdef CONFIG_SPE
1677 case PTRACE_GETEVRREGS:
1678 /* Get the child spe register state. */
1679 return copy_regset_to_user(child, &user_ppc_native_view,
1680 REGSET_SPE, 0, 35 * sizeof(u32),
1681 datavp);
1682
1683 case PTRACE_SETEVRREGS:
1684 /* Set the child spe register state. */
1685 return copy_regset_from_user(child, &user_ppc_native_view,
1686 REGSET_SPE, 0, 35 * sizeof(u32),
1687 datavp);
1688 #endif
1689
1690 /* Old reverse args ptrace callss */
1691 case PPC_PTRACE_GETREGS: /* Get GPRs 0 - 31. */
1692 case PPC_PTRACE_SETREGS: /* Set GPRs 0 - 31. */
1693 case PPC_PTRACE_GETFPREGS: /* Get FPRs 0 - 31. */
1694 case PPC_PTRACE_SETFPREGS: /* Get FPRs 0 - 31. */
1695 ret = arch_ptrace_old(child, request, addr, data);
1696 break;
1697
1698 default:
1699 ret = ptrace_request(child, request, addr, data);
1700 break;
1701 }
1702 return ret;
1703 }
1704
1705 /*
1706 * We must return the syscall number to actually look up in the table.
1707 * This can be -1L to skip running any syscall at all.
1708 */
1709 long do_syscall_trace_enter(struct pt_regs *regs)
1710 {
1711 long ret = 0;
1712
1713 secure_computing(regs->gpr[0]);
1714
1715 if (test_thread_flag(TIF_SYSCALL_TRACE) &&
1716 tracehook_report_syscall_entry(regs))
1717 /*
1718 * Tracing decided this syscall should not happen.
1719 * We'll return a bogus call number to get an ENOSYS
1720 * error, but leave the original number in regs->gpr[0].
1721 */
1722 ret = -1L;
1723
1724 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
1725 trace_sys_enter(regs, regs->gpr[0]);
1726
1727 #ifdef CONFIG_PPC64
1728 if (!is_32bit_task())
1729 audit_syscall_entry(AUDIT_ARCH_PPC64,
1730 regs->gpr[0],
1731 regs->gpr[3], regs->gpr[4],
1732 regs->gpr[5], regs->gpr[6]);
1733 else
1734 #endif
1735 audit_syscall_entry(AUDIT_ARCH_PPC,
1736 regs->gpr[0],
1737 regs->gpr[3] & 0xffffffff,
1738 regs->gpr[4] & 0xffffffff,
1739 regs->gpr[5] & 0xffffffff,
1740 regs->gpr[6] & 0xffffffff);
1741
1742 return ret ?: regs->gpr[0];
1743 }
1744
1745 void do_syscall_trace_leave(struct pt_regs *regs)
1746 {
1747 int step;
1748
1749 audit_syscall_exit(regs);
1750
1751 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
1752 trace_sys_exit(regs, regs->result);
1753
1754 step = test_thread_flag(TIF_SINGLESTEP);
1755 if (step || test_thread_flag(TIF_SYSCALL_TRACE))
1756 tracehook_report_syscall_exit(regs, step);
1757 }