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Merge ssh://master.kernel.org/pub/scm/linux/kernel/git/linville/wireless-2.6
[deliverable/linux.git] / arch / powerpc / kernel / ptrace.c
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 #ifdef CONFIG_PPC32
33 #include <linux/module.h>
34 #endif
35 #include <linux/hw_breakpoint.h>
36 #include <linux/perf_event.h>
37
38 #include <asm/uaccess.h>
39 #include <asm/page.h>
40 #include <asm/pgtable.h>
41 #include <asm/system.h>
42
43 /*
44 * The parameter save area on the stack is used to store arguments being passed
45 * to callee function and is located at fixed offset from stack pointer.
46 */
47 #ifdef CONFIG_PPC32
48 #define PARAMETER_SAVE_AREA_OFFSET 24 /* bytes */
49 #else /* CONFIG_PPC32 */
50 #define PARAMETER_SAVE_AREA_OFFSET 48 /* bytes */
51 #endif
52
53 struct pt_regs_offset {
54 const char *name;
55 int offset;
56 };
57
58 #define STR(s) #s /* convert to string */
59 #define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
60 #define GPR_OFFSET_NAME(num) \
61 {.name = STR(gpr##num), .offset = offsetof(struct pt_regs, gpr[num])}
62 #define REG_OFFSET_END {.name = NULL, .offset = 0}
63
64 static const struct pt_regs_offset regoffset_table[] = {
65 GPR_OFFSET_NAME(0),
66 GPR_OFFSET_NAME(1),
67 GPR_OFFSET_NAME(2),
68 GPR_OFFSET_NAME(3),
69 GPR_OFFSET_NAME(4),
70 GPR_OFFSET_NAME(5),
71 GPR_OFFSET_NAME(6),
72 GPR_OFFSET_NAME(7),
73 GPR_OFFSET_NAME(8),
74 GPR_OFFSET_NAME(9),
75 GPR_OFFSET_NAME(10),
76 GPR_OFFSET_NAME(11),
77 GPR_OFFSET_NAME(12),
78 GPR_OFFSET_NAME(13),
79 GPR_OFFSET_NAME(14),
80 GPR_OFFSET_NAME(15),
81 GPR_OFFSET_NAME(16),
82 GPR_OFFSET_NAME(17),
83 GPR_OFFSET_NAME(18),
84 GPR_OFFSET_NAME(19),
85 GPR_OFFSET_NAME(20),
86 GPR_OFFSET_NAME(21),
87 GPR_OFFSET_NAME(22),
88 GPR_OFFSET_NAME(23),
89 GPR_OFFSET_NAME(24),
90 GPR_OFFSET_NAME(25),
91 GPR_OFFSET_NAME(26),
92 GPR_OFFSET_NAME(27),
93 GPR_OFFSET_NAME(28),
94 GPR_OFFSET_NAME(29),
95 GPR_OFFSET_NAME(30),
96 GPR_OFFSET_NAME(31),
97 REG_OFFSET_NAME(nip),
98 REG_OFFSET_NAME(msr),
99 REG_OFFSET_NAME(ctr),
100 REG_OFFSET_NAME(link),
101 REG_OFFSET_NAME(xer),
102 REG_OFFSET_NAME(ccr),
103 #ifdef CONFIG_PPC64
104 REG_OFFSET_NAME(softe),
105 #else
106 REG_OFFSET_NAME(mq),
107 #endif
108 REG_OFFSET_NAME(trap),
109 REG_OFFSET_NAME(dar),
110 REG_OFFSET_NAME(dsisr),
111 REG_OFFSET_END,
112 };
113
114 /**
115 * regs_query_register_offset() - query register offset from its name
116 * @name: the name of a register
117 *
118 * regs_query_register_offset() returns the offset of a register in struct
119 * pt_regs from its name. If the name is invalid, this returns -EINVAL;
120 */
121 int regs_query_register_offset(const char *name)
122 {
123 const struct pt_regs_offset *roff;
124 for (roff = regoffset_table; roff->name != NULL; roff++)
125 if (!strcmp(roff->name, name))
126 return roff->offset;
127 return -EINVAL;
128 }
129
130 /**
131 * regs_query_register_name() - query register name from its offset
132 * @offset: the offset of a register in struct pt_regs.
133 *
134 * regs_query_register_name() returns the name of a register from its
135 * offset in struct pt_regs. If the @offset is invalid, this returns NULL;
136 */
137 const char *regs_query_register_name(unsigned int offset)
138 {
139 const struct pt_regs_offset *roff;
140 for (roff = regoffset_table; roff->name != NULL; roff++)
141 if (roff->offset == offset)
142 return roff->name;
143 return NULL;
144 }
145
146 /*
147 * does not yet catch signals sent when the child dies.
148 * in exit.c or in signal.c.
149 */
150
151 /*
152 * Set of msr bits that gdb can change on behalf of a process.
153 */
154 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
155 #define MSR_DEBUGCHANGE 0
156 #else
157 #define MSR_DEBUGCHANGE (MSR_SE | MSR_BE)
158 #endif
159
160 /*
161 * Max register writeable via put_reg
162 */
163 #ifdef CONFIG_PPC32
164 #define PT_MAX_PUT_REG PT_MQ
165 #else
166 #define PT_MAX_PUT_REG PT_CCR
167 #endif
168
169 static unsigned long get_user_msr(struct task_struct *task)
170 {
171 return task->thread.regs->msr | task->thread.fpexc_mode;
172 }
173
174 static int set_user_msr(struct task_struct *task, unsigned long msr)
175 {
176 task->thread.regs->msr &= ~MSR_DEBUGCHANGE;
177 task->thread.regs->msr |= msr & MSR_DEBUGCHANGE;
178 return 0;
179 }
180
181 /*
182 * We prevent mucking around with the reserved area of trap
183 * which are used internally by the kernel.
184 */
185 static int set_user_trap(struct task_struct *task, unsigned long trap)
186 {
187 task->thread.regs->trap = trap & 0xfff0;
188 return 0;
189 }
190
191 /*
192 * Get contents of register REGNO in task TASK.
193 */
194 unsigned long ptrace_get_reg(struct task_struct *task, int regno)
195 {
196 if (task->thread.regs == NULL)
197 return -EIO;
198
199 if (regno == PT_MSR)
200 return get_user_msr(task);
201
202 if (regno < (sizeof(struct pt_regs) / sizeof(unsigned long)))
203 return ((unsigned long *)task->thread.regs)[regno];
204
205 return -EIO;
206 }
207
208 /*
209 * Write contents of register REGNO in task TASK.
210 */
211 int ptrace_put_reg(struct task_struct *task, int regno, unsigned long data)
212 {
213 if (task->thread.regs == NULL)
214 return -EIO;
215
216 if (regno == PT_MSR)
217 return set_user_msr(task, data);
218 if (regno == PT_TRAP)
219 return set_user_trap(task, data);
220
221 if (regno <= PT_MAX_PUT_REG) {
222 ((unsigned long *)task->thread.regs)[regno] = data;
223 return 0;
224 }
225 return -EIO;
226 }
227
228 static int gpr_get(struct task_struct *target, const struct user_regset *regset,
229 unsigned int pos, unsigned int count,
230 void *kbuf, void __user *ubuf)
231 {
232 int ret;
233
234 if (target->thread.regs == NULL)
235 return -EIO;
236
237 CHECK_FULL_REGS(target->thread.regs);
238
239 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
240 target->thread.regs,
241 0, offsetof(struct pt_regs, msr));
242 if (!ret) {
243 unsigned long msr = get_user_msr(target);
244 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &msr,
245 offsetof(struct pt_regs, msr),
246 offsetof(struct pt_regs, msr) +
247 sizeof(msr));
248 }
249
250 BUILD_BUG_ON(offsetof(struct pt_regs, orig_gpr3) !=
251 offsetof(struct pt_regs, msr) + sizeof(long));
252
253 if (!ret)
254 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
255 &target->thread.regs->orig_gpr3,
256 offsetof(struct pt_regs, orig_gpr3),
257 sizeof(struct pt_regs));
258 if (!ret)
259 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
260 sizeof(struct pt_regs), -1);
261
262 return ret;
263 }
264
265 static int gpr_set(struct task_struct *target, const struct user_regset *regset,
266 unsigned int pos, unsigned int count,
267 const void *kbuf, const void __user *ubuf)
268 {
269 unsigned long reg;
270 int ret;
271
272 if (target->thread.regs == NULL)
273 return -EIO;
274
275 CHECK_FULL_REGS(target->thread.regs);
276
277 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
278 target->thread.regs,
279 0, PT_MSR * sizeof(reg));
280
281 if (!ret && count > 0) {
282 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &reg,
283 PT_MSR * sizeof(reg),
284 (PT_MSR + 1) * sizeof(reg));
285 if (!ret)
286 ret = set_user_msr(target, reg);
287 }
288
289 BUILD_BUG_ON(offsetof(struct pt_regs, orig_gpr3) !=
290 offsetof(struct pt_regs, msr) + sizeof(long));
291
292 if (!ret)
293 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
294 &target->thread.regs->orig_gpr3,
295 PT_ORIG_R3 * sizeof(reg),
296 (PT_MAX_PUT_REG + 1) * sizeof(reg));
297
298 if (PT_MAX_PUT_REG + 1 < PT_TRAP && !ret)
299 ret = user_regset_copyin_ignore(
300 &pos, &count, &kbuf, &ubuf,
301 (PT_MAX_PUT_REG + 1) * sizeof(reg),
302 PT_TRAP * sizeof(reg));
303
304 if (!ret && count > 0) {
305 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &reg,
306 PT_TRAP * sizeof(reg),
307 (PT_TRAP + 1) * sizeof(reg));
308 if (!ret)
309 ret = set_user_trap(target, reg);
310 }
311
312 if (!ret)
313 ret = user_regset_copyin_ignore(
314 &pos, &count, &kbuf, &ubuf,
315 (PT_TRAP + 1) * sizeof(reg), -1);
316
317 return ret;
318 }
319
320 static int fpr_get(struct task_struct *target, const struct user_regset *regset,
321 unsigned int pos, unsigned int count,
322 void *kbuf, void __user *ubuf)
323 {
324 #ifdef CONFIG_VSX
325 double buf[33];
326 int i;
327 #endif
328 flush_fp_to_thread(target);
329
330 #ifdef CONFIG_VSX
331 /* copy to local buffer then write that out */
332 for (i = 0; i < 32 ; i++)
333 buf[i] = target->thread.TS_FPR(i);
334 memcpy(&buf[32], &target->thread.fpscr, sizeof(double));
335 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, buf, 0, -1);
336
337 #else
338 BUILD_BUG_ON(offsetof(struct thread_struct, fpscr) !=
339 offsetof(struct thread_struct, TS_FPR(32)));
340
341 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
342 &target->thread.fpr, 0, -1);
343 #endif
344 }
345
346 static int fpr_set(struct task_struct *target, const struct user_regset *regset,
347 unsigned int pos, unsigned int count,
348 const void *kbuf, const void __user *ubuf)
349 {
350 #ifdef CONFIG_VSX
351 double buf[33];
352 int i;
353 #endif
354 flush_fp_to_thread(target);
355
356 #ifdef CONFIG_VSX
357 /* copy to local buffer then write that out */
358 i = user_regset_copyin(&pos, &count, &kbuf, &ubuf, buf, 0, -1);
359 if (i)
360 return i;
361 for (i = 0; i < 32 ; i++)
362 target->thread.TS_FPR(i) = buf[i];
363 memcpy(&target->thread.fpscr, &buf[32], sizeof(double));
364 return 0;
365 #else
366 BUILD_BUG_ON(offsetof(struct thread_struct, fpscr) !=
367 offsetof(struct thread_struct, TS_FPR(32)));
368
369 return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
370 &target->thread.fpr, 0, -1);
371 #endif
372 }
373
374 #ifdef CONFIG_ALTIVEC
375 /*
376 * Get/set all the altivec registers vr0..vr31, vscr, vrsave, in one go.
377 * The transfer totals 34 quadword. Quadwords 0-31 contain the
378 * corresponding vector registers. Quadword 32 contains the vscr as the
379 * last word (offset 12) within that quadword. Quadword 33 contains the
380 * vrsave as the first word (offset 0) within the quadword.
381 *
382 * This definition of the VMX state is compatible with the current PPC32
383 * ptrace interface. This allows signal handling and ptrace to use the
384 * same structures. This also simplifies the implementation of a bi-arch
385 * (combined (32- and 64-bit) gdb.
386 */
387
388 static int vr_active(struct task_struct *target,
389 const struct user_regset *regset)
390 {
391 flush_altivec_to_thread(target);
392 return target->thread.used_vr ? regset->n : 0;
393 }
394
395 static int vr_get(struct task_struct *target, const struct user_regset *regset,
396 unsigned int pos, unsigned int count,
397 void *kbuf, void __user *ubuf)
398 {
399 int ret;
400
401 flush_altivec_to_thread(target);
402
403 BUILD_BUG_ON(offsetof(struct thread_struct, vscr) !=
404 offsetof(struct thread_struct, vr[32]));
405
406 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
407 &target->thread.vr, 0,
408 33 * sizeof(vector128));
409 if (!ret) {
410 /*
411 * Copy out only the low-order word of vrsave.
412 */
413 union {
414 elf_vrreg_t reg;
415 u32 word;
416 } vrsave;
417 memset(&vrsave, 0, sizeof(vrsave));
418 vrsave.word = target->thread.vrsave;
419 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &vrsave,
420 33 * sizeof(vector128), -1);
421 }
422
423 return ret;
424 }
425
426 static int vr_set(struct task_struct *target, const struct user_regset *regset,
427 unsigned int pos, unsigned int count,
428 const void *kbuf, const void __user *ubuf)
429 {
430 int ret;
431
432 flush_altivec_to_thread(target);
433
434 BUILD_BUG_ON(offsetof(struct thread_struct, vscr) !=
435 offsetof(struct thread_struct, vr[32]));
436
437 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
438 &target->thread.vr, 0, 33 * sizeof(vector128));
439 if (!ret && count > 0) {
440 /*
441 * We use only the first word of vrsave.
442 */
443 union {
444 elf_vrreg_t reg;
445 u32 word;
446 } vrsave;
447 memset(&vrsave, 0, sizeof(vrsave));
448 vrsave.word = target->thread.vrsave;
449 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &vrsave,
450 33 * sizeof(vector128), -1);
451 if (!ret)
452 target->thread.vrsave = vrsave.word;
453 }
454
455 return ret;
456 }
457 #endif /* CONFIG_ALTIVEC */
458
459 #ifdef CONFIG_VSX
460 /*
461 * Currently to set and and get all the vsx state, you need to call
462 * the fp and VMX calls aswell. This only get/sets the lower 32
463 * 128bit VSX registers.
464 */
465
466 static int vsr_active(struct task_struct *target,
467 const struct user_regset *regset)
468 {
469 flush_vsx_to_thread(target);
470 return target->thread.used_vsr ? regset->n : 0;
471 }
472
473 static int vsr_get(struct task_struct *target, const struct user_regset *regset,
474 unsigned int pos, unsigned int count,
475 void *kbuf, void __user *ubuf)
476 {
477 double buf[32];
478 int ret, i;
479
480 flush_vsx_to_thread(target);
481
482 for (i = 0; i < 32 ; i++)
483 buf[i] = target->thread.fpr[i][TS_VSRLOWOFFSET];
484 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
485 buf, 0, 32 * sizeof(double));
486
487 return ret;
488 }
489
490 static int vsr_set(struct task_struct *target, const struct user_regset *regset,
491 unsigned int pos, unsigned int count,
492 const void *kbuf, const void __user *ubuf)
493 {
494 double buf[32];
495 int ret,i;
496
497 flush_vsx_to_thread(target);
498
499 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
500 buf, 0, 32 * sizeof(double));
501 for (i = 0; i < 32 ; i++)
502 target->thread.fpr[i][TS_VSRLOWOFFSET] = buf[i];
503
504
505 return ret;
506 }
507 #endif /* CONFIG_VSX */
508
509 #ifdef CONFIG_SPE
510
511 /*
512 * For get_evrregs/set_evrregs functions 'data' has the following layout:
513 *
514 * struct {
515 * u32 evr[32];
516 * u64 acc;
517 * u32 spefscr;
518 * }
519 */
520
521 static int evr_active(struct task_struct *target,
522 const struct user_regset *regset)
523 {
524 flush_spe_to_thread(target);
525 return target->thread.used_spe ? regset->n : 0;
526 }
527
528 static int evr_get(struct task_struct *target, const struct user_regset *regset,
529 unsigned int pos, unsigned int count,
530 void *kbuf, void __user *ubuf)
531 {
532 int ret;
533
534 flush_spe_to_thread(target);
535
536 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
537 &target->thread.evr,
538 0, sizeof(target->thread.evr));
539
540 BUILD_BUG_ON(offsetof(struct thread_struct, acc) + sizeof(u64) !=
541 offsetof(struct thread_struct, spefscr));
542
543 if (!ret)
544 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
545 &target->thread.acc,
546 sizeof(target->thread.evr), -1);
547
548 return ret;
549 }
550
551 static int evr_set(struct task_struct *target, const struct user_regset *regset,
552 unsigned int pos, unsigned int count,
553 const void *kbuf, const void __user *ubuf)
554 {
555 int ret;
556
557 flush_spe_to_thread(target);
558
559 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
560 &target->thread.evr,
561 0, sizeof(target->thread.evr));
562
563 BUILD_BUG_ON(offsetof(struct thread_struct, acc) + sizeof(u64) !=
564 offsetof(struct thread_struct, spefscr));
565
566 if (!ret)
567 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
568 &target->thread.acc,
569 sizeof(target->thread.evr), -1);
570
571 return ret;
572 }
573 #endif /* CONFIG_SPE */
574
575
576 /*
577 * These are our native regset flavors.
578 */
579 enum powerpc_regset {
580 REGSET_GPR,
581 REGSET_FPR,
582 #ifdef CONFIG_ALTIVEC
583 REGSET_VMX,
584 #endif
585 #ifdef CONFIG_VSX
586 REGSET_VSX,
587 #endif
588 #ifdef CONFIG_SPE
589 REGSET_SPE,
590 #endif
591 };
592
593 static const struct user_regset native_regsets[] = {
594 [REGSET_GPR] = {
595 .core_note_type = NT_PRSTATUS, .n = ELF_NGREG,
596 .size = sizeof(long), .align = sizeof(long),
597 .get = gpr_get, .set = gpr_set
598 },
599 [REGSET_FPR] = {
600 .core_note_type = NT_PRFPREG, .n = ELF_NFPREG,
601 .size = sizeof(double), .align = sizeof(double),
602 .get = fpr_get, .set = fpr_set
603 },
604 #ifdef CONFIG_ALTIVEC
605 [REGSET_VMX] = {
606 .core_note_type = NT_PPC_VMX, .n = 34,
607 .size = sizeof(vector128), .align = sizeof(vector128),
608 .active = vr_active, .get = vr_get, .set = vr_set
609 },
610 #endif
611 #ifdef CONFIG_VSX
612 [REGSET_VSX] = {
613 .core_note_type = NT_PPC_VSX, .n = 32,
614 .size = sizeof(double), .align = sizeof(double),
615 .active = vsr_active, .get = vsr_get, .set = vsr_set
616 },
617 #endif
618 #ifdef CONFIG_SPE
619 [REGSET_SPE] = {
620 .n = 35,
621 .size = sizeof(u32), .align = sizeof(u32),
622 .active = evr_active, .get = evr_get, .set = evr_set
623 },
624 #endif
625 };
626
627 static const struct user_regset_view user_ppc_native_view = {
628 .name = UTS_MACHINE, .e_machine = ELF_ARCH, .ei_osabi = ELF_OSABI,
629 .regsets = native_regsets, .n = ARRAY_SIZE(native_regsets)
630 };
631
632 #ifdef CONFIG_PPC64
633 #include <linux/compat.h>
634
635 static int gpr32_get(struct task_struct *target,
636 const struct user_regset *regset,
637 unsigned int pos, unsigned int count,
638 void *kbuf, void __user *ubuf)
639 {
640 const unsigned long *regs = &target->thread.regs->gpr[0];
641 compat_ulong_t *k = kbuf;
642 compat_ulong_t __user *u = ubuf;
643 compat_ulong_t reg;
644
645 if (target->thread.regs == NULL)
646 return -EIO;
647
648 CHECK_FULL_REGS(target->thread.regs);
649
650 pos /= sizeof(reg);
651 count /= sizeof(reg);
652
653 if (kbuf)
654 for (; count > 0 && pos < PT_MSR; --count)
655 *k++ = regs[pos++];
656 else
657 for (; count > 0 && pos < PT_MSR; --count)
658 if (__put_user((compat_ulong_t) regs[pos++], u++))
659 return -EFAULT;
660
661 if (count > 0 && pos == PT_MSR) {
662 reg = get_user_msr(target);
663 if (kbuf)
664 *k++ = reg;
665 else if (__put_user(reg, u++))
666 return -EFAULT;
667 ++pos;
668 --count;
669 }
670
671 if (kbuf)
672 for (; count > 0 && pos < PT_REGS_COUNT; --count)
673 *k++ = regs[pos++];
674 else
675 for (; count > 0 && pos < PT_REGS_COUNT; --count)
676 if (__put_user((compat_ulong_t) regs[pos++], u++))
677 return -EFAULT;
678
679 kbuf = k;
680 ubuf = u;
681 pos *= sizeof(reg);
682 count *= sizeof(reg);
683 return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
684 PT_REGS_COUNT * sizeof(reg), -1);
685 }
686
687 static int gpr32_set(struct task_struct *target,
688 const struct user_regset *regset,
689 unsigned int pos, unsigned int count,
690 const void *kbuf, const void __user *ubuf)
691 {
692 unsigned long *regs = &target->thread.regs->gpr[0];
693 const compat_ulong_t *k = kbuf;
694 const compat_ulong_t __user *u = ubuf;
695 compat_ulong_t reg;
696
697 if (target->thread.regs == NULL)
698 return -EIO;
699
700 CHECK_FULL_REGS(target->thread.regs);
701
702 pos /= sizeof(reg);
703 count /= sizeof(reg);
704
705 if (kbuf)
706 for (; count > 0 && pos < PT_MSR; --count)
707 regs[pos++] = *k++;
708 else
709 for (; count > 0 && pos < PT_MSR; --count) {
710 if (__get_user(reg, u++))
711 return -EFAULT;
712 regs[pos++] = reg;
713 }
714
715
716 if (count > 0 && pos == PT_MSR) {
717 if (kbuf)
718 reg = *k++;
719 else if (__get_user(reg, u++))
720 return -EFAULT;
721 set_user_msr(target, reg);
722 ++pos;
723 --count;
724 }
725
726 if (kbuf) {
727 for (; count > 0 && pos <= PT_MAX_PUT_REG; --count)
728 regs[pos++] = *k++;
729 for (; count > 0 && pos < PT_TRAP; --count, ++pos)
730 ++k;
731 } else {
732 for (; count > 0 && pos <= PT_MAX_PUT_REG; --count) {
733 if (__get_user(reg, u++))
734 return -EFAULT;
735 regs[pos++] = reg;
736 }
737 for (; count > 0 && pos < PT_TRAP; --count, ++pos)
738 if (__get_user(reg, u++))
739 return -EFAULT;
740 }
741
742 if (count > 0 && pos == PT_TRAP) {
743 if (kbuf)
744 reg = *k++;
745 else if (__get_user(reg, u++))
746 return -EFAULT;
747 set_user_trap(target, reg);
748 ++pos;
749 --count;
750 }
751
752 kbuf = k;
753 ubuf = u;
754 pos *= sizeof(reg);
755 count *= sizeof(reg);
756 return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
757 (PT_TRAP + 1) * sizeof(reg), -1);
758 }
759
760 /*
761 * These are the regset flavors matching the CONFIG_PPC32 native set.
762 */
763 static const struct user_regset compat_regsets[] = {
764 [REGSET_GPR] = {
765 .core_note_type = NT_PRSTATUS, .n = ELF_NGREG,
766 .size = sizeof(compat_long_t), .align = sizeof(compat_long_t),
767 .get = gpr32_get, .set = gpr32_set
768 },
769 [REGSET_FPR] = {
770 .core_note_type = NT_PRFPREG, .n = ELF_NFPREG,
771 .size = sizeof(double), .align = sizeof(double),
772 .get = fpr_get, .set = fpr_set
773 },
774 #ifdef CONFIG_ALTIVEC
775 [REGSET_VMX] = {
776 .core_note_type = NT_PPC_VMX, .n = 34,
777 .size = sizeof(vector128), .align = sizeof(vector128),
778 .active = vr_active, .get = vr_get, .set = vr_set
779 },
780 #endif
781 #ifdef CONFIG_SPE
782 [REGSET_SPE] = {
783 .core_note_type = NT_PPC_SPE, .n = 35,
784 .size = sizeof(u32), .align = sizeof(u32),
785 .active = evr_active, .get = evr_get, .set = evr_set
786 },
787 #endif
788 };
789
790 static const struct user_regset_view user_ppc_compat_view = {
791 .name = "ppc", .e_machine = EM_PPC, .ei_osabi = ELF_OSABI,
792 .regsets = compat_regsets, .n = ARRAY_SIZE(compat_regsets)
793 };
794 #endif /* CONFIG_PPC64 */
795
796 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
797 {
798 #ifdef CONFIG_PPC64
799 if (test_tsk_thread_flag(task, TIF_32BIT))
800 return &user_ppc_compat_view;
801 #endif
802 return &user_ppc_native_view;
803 }
804
805
806 void user_enable_single_step(struct task_struct *task)
807 {
808 struct pt_regs *regs = task->thread.regs;
809
810 if (regs != NULL) {
811 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
812 task->thread.dbcr0 &= ~DBCR0_BT;
813 task->thread.dbcr0 |= DBCR0_IDM | DBCR0_IC;
814 regs->msr |= MSR_DE;
815 #else
816 regs->msr &= ~MSR_BE;
817 regs->msr |= MSR_SE;
818 #endif
819 }
820 set_tsk_thread_flag(task, TIF_SINGLESTEP);
821 }
822
823 void user_enable_block_step(struct task_struct *task)
824 {
825 struct pt_regs *regs = task->thread.regs;
826
827 if (regs != NULL) {
828 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
829 task->thread.dbcr0 &= ~DBCR0_IC;
830 task->thread.dbcr0 = DBCR0_IDM | DBCR0_BT;
831 regs->msr |= MSR_DE;
832 #else
833 regs->msr &= ~MSR_SE;
834 regs->msr |= MSR_BE;
835 #endif
836 }
837 set_tsk_thread_flag(task, TIF_SINGLESTEP);
838 }
839
840 void user_disable_single_step(struct task_struct *task)
841 {
842 struct pt_regs *regs = task->thread.regs;
843
844 if (regs != NULL) {
845 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
846 /*
847 * The logic to disable single stepping should be as
848 * simple as turning off the Instruction Complete flag.
849 * And, after doing so, if all debug flags are off, turn
850 * off DBCR0(IDM) and MSR(DE) .... Torez
851 */
852 task->thread.dbcr0 &= ~DBCR0_IC;
853 /*
854 * Test to see if any of the DBCR_ACTIVE_EVENTS bits are set.
855 */
856 if (!DBCR_ACTIVE_EVENTS(task->thread.dbcr0,
857 task->thread.dbcr1)) {
858 /*
859 * All debug events were off.....
860 */
861 task->thread.dbcr0 &= ~DBCR0_IDM;
862 regs->msr &= ~MSR_DE;
863 }
864 #else
865 regs->msr &= ~(MSR_SE | MSR_BE);
866 #endif
867 }
868 clear_tsk_thread_flag(task, TIF_SINGLESTEP);
869 }
870
871 #ifdef CONFIG_HAVE_HW_BREAKPOINT
872 void ptrace_triggered(struct perf_event *bp, int nmi,
873 struct perf_sample_data *data, struct pt_regs *regs)
874 {
875 struct perf_event_attr attr;
876
877 /*
878 * Disable the breakpoint request here since ptrace has defined a
879 * one-shot behaviour for breakpoint exceptions in PPC64.
880 * The SIGTRAP signal is generated automatically for us in do_dabr().
881 * We don't have to do anything about that here
882 */
883 attr = bp->attr;
884 attr.disabled = true;
885 modify_user_hw_breakpoint(bp, &attr);
886 }
887 #endif /* CONFIG_HAVE_HW_BREAKPOINT */
888
889 int ptrace_set_debugreg(struct task_struct *task, unsigned long addr,
890 unsigned long data)
891 {
892 #ifdef CONFIG_HAVE_HW_BREAKPOINT
893 int ret;
894 struct thread_struct *thread = &(task->thread);
895 struct perf_event *bp;
896 struct perf_event_attr attr;
897 #endif /* CONFIG_HAVE_HW_BREAKPOINT */
898
899 /* For ppc64 we support one DABR and no IABR's at the moment (ppc64).
900 * For embedded processors we support one DAC and no IAC's at the
901 * moment.
902 */
903 if (addr > 0)
904 return -EINVAL;
905
906 /* The bottom 3 bits in dabr are flags */
907 if ((data & ~0x7UL) >= TASK_SIZE)
908 return -EIO;
909
910 #ifndef CONFIG_PPC_ADV_DEBUG_REGS
911 /* For processors using DABR (i.e. 970), the bottom 3 bits are flags.
912 * It was assumed, on previous implementations, that 3 bits were
913 * passed together with the data address, fitting the design of the
914 * DABR register, as follows:
915 *
916 * bit 0: Read flag
917 * bit 1: Write flag
918 * bit 2: Breakpoint translation
919 *
920 * Thus, we use them here as so.
921 */
922
923 /* Ensure breakpoint translation bit is set */
924 if (data && !(data & DABR_TRANSLATION))
925 return -EIO;
926 #ifdef CONFIG_HAVE_HW_BREAKPOINT
927 bp = thread->ptrace_bps[0];
928 if ((!data) || !(data & (DABR_DATA_WRITE | DABR_DATA_READ))) {
929 if (bp) {
930 unregister_hw_breakpoint(bp);
931 thread->ptrace_bps[0] = NULL;
932 }
933 return 0;
934 }
935 if (bp) {
936 attr = bp->attr;
937 attr.bp_addr = data & ~HW_BREAKPOINT_ALIGN;
938 arch_bp_generic_fields(data &
939 (DABR_DATA_WRITE | DABR_DATA_READ),
940 &attr.bp_type);
941 ret = modify_user_hw_breakpoint(bp, &attr);
942 if (ret)
943 return ret;
944 thread->ptrace_bps[0] = bp;
945 thread->dabr = data;
946 return 0;
947 }
948
949 /* Create a new breakpoint request if one doesn't exist already */
950 hw_breakpoint_init(&attr);
951 attr.bp_addr = data & ~HW_BREAKPOINT_ALIGN;
952 arch_bp_generic_fields(data & (DABR_DATA_WRITE | DABR_DATA_READ),
953 &attr.bp_type);
954
955 thread->ptrace_bps[0] = bp = register_user_hw_breakpoint(&attr,
956 ptrace_triggered, task);
957 if (IS_ERR(bp)) {
958 thread->ptrace_bps[0] = NULL;
959 return PTR_ERR(bp);
960 }
961
962 #endif /* CONFIG_HAVE_HW_BREAKPOINT */
963
964 /* Move contents to the DABR register */
965 task->thread.dabr = data;
966 #else /* CONFIG_PPC_ADV_DEBUG_REGS */
967 /* As described above, it was assumed 3 bits were passed with the data
968 * address, but we will assume only the mode bits will be passed
969 * as to not cause alignment restrictions for DAC-based processors.
970 */
971
972 /* DAC's hold the whole address without any mode flags */
973 task->thread.dac1 = data & ~0x3UL;
974
975 if (task->thread.dac1 == 0) {
976 dbcr_dac(task) &= ~(DBCR_DAC1R | DBCR_DAC1W);
977 if (!DBCR_ACTIVE_EVENTS(task->thread.dbcr0,
978 task->thread.dbcr1)) {
979 task->thread.regs->msr &= ~MSR_DE;
980 task->thread.dbcr0 &= ~DBCR0_IDM;
981 }
982 return 0;
983 }
984
985 /* Read or Write bits must be set */
986
987 if (!(data & 0x3UL))
988 return -EINVAL;
989
990 /* Set the Internal Debugging flag (IDM bit 1) for the DBCR0
991 register */
992 task->thread.dbcr0 |= DBCR0_IDM;
993
994 /* Check for write and read flags and set DBCR0
995 accordingly */
996 dbcr_dac(task) &= ~(DBCR_DAC1R|DBCR_DAC1W);
997 if (data & 0x1UL)
998 dbcr_dac(task) |= DBCR_DAC1R;
999 if (data & 0x2UL)
1000 dbcr_dac(task) |= DBCR_DAC1W;
1001 task->thread.regs->msr |= MSR_DE;
1002 #endif /* CONFIG_PPC_ADV_DEBUG_REGS */
1003 return 0;
1004 }
1005
1006 /*
1007 * Called by kernel/ptrace.c when detaching..
1008 *
1009 * Make sure single step bits etc are not set.
1010 */
1011 void ptrace_disable(struct task_struct *child)
1012 {
1013 /* make sure the single step bit is not set. */
1014 user_disable_single_step(child);
1015 }
1016
1017 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
1018 static long set_intruction_bp(struct task_struct *child,
1019 struct ppc_hw_breakpoint *bp_info)
1020 {
1021 int slot;
1022 int slot1_in_use = ((child->thread.dbcr0 & DBCR0_IAC1) != 0);
1023 int slot2_in_use = ((child->thread.dbcr0 & DBCR0_IAC2) != 0);
1024 int slot3_in_use = ((child->thread.dbcr0 & DBCR0_IAC3) != 0);
1025 int slot4_in_use = ((child->thread.dbcr0 & DBCR0_IAC4) != 0);
1026
1027 if (dbcr_iac_range(child) & DBCR_IAC12MODE)
1028 slot2_in_use = 1;
1029 if (dbcr_iac_range(child) & DBCR_IAC34MODE)
1030 slot4_in_use = 1;
1031
1032 if (bp_info->addr >= TASK_SIZE)
1033 return -EIO;
1034
1035 if (bp_info->addr_mode != PPC_BREAKPOINT_MODE_EXACT) {
1036
1037 /* Make sure range is valid. */
1038 if (bp_info->addr2 >= TASK_SIZE)
1039 return -EIO;
1040
1041 /* We need a pair of IAC regsisters */
1042 if ((!slot1_in_use) && (!slot2_in_use)) {
1043 slot = 1;
1044 child->thread.iac1 = bp_info->addr;
1045 child->thread.iac2 = bp_info->addr2;
1046 child->thread.dbcr0 |= DBCR0_IAC1;
1047 if (bp_info->addr_mode ==
1048 PPC_BREAKPOINT_MODE_RANGE_EXCLUSIVE)
1049 dbcr_iac_range(child) |= DBCR_IAC12X;
1050 else
1051 dbcr_iac_range(child) |= DBCR_IAC12I;
1052 #if CONFIG_PPC_ADV_DEBUG_IACS > 2
1053 } else if ((!slot3_in_use) && (!slot4_in_use)) {
1054 slot = 3;
1055 child->thread.iac3 = bp_info->addr;
1056 child->thread.iac4 = bp_info->addr2;
1057 child->thread.dbcr0 |= DBCR0_IAC3;
1058 if (bp_info->addr_mode ==
1059 PPC_BREAKPOINT_MODE_RANGE_EXCLUSIVE)
1060 dbcr_iac_range(child) |= DBCR_IAC34X;
1061 else
1062 dbcr_iac_range(child) |= DBCR_IAC34I;
1063 #endif
1064 } else
1065 return -ENOSPC;
1066 } else {
1067 /* We only need one. If possible leave a pair free in
1068 * case a range is needed later
1069 */
1070 if (!slot1_in_use) {
1071 /*
1072 * Don't use iac1 if iac1-iac2 are free and either
1073 * iac3 or iac4 (but not both) are free
1074 */
1075 if (slot2_in_use || (slot3_in_use == slot4_in_use)) {
1076 slot = 1;
1077 child->thread.iac1 = bp_info->addr;
1078 child->thread.dbcr0 |= DBCR0_IAC1;
1079 goto out;
1080 }
1081 }
1082 if (!slot2_in_use) {
1083 slot = 2;
1084 child->thread.iac2 = bp_info->addr;
1085 child->thread.dbcr0 |= DBCR0_IAC2;
1086 #if CONFIG_PPC_ADV_DEBUG_IACS > 2
1087 } else if (!slot3_in_use) {
1088 slot = 3;
1089 child->thread.iac3 = bp_info->addr;
1090 child->thread.dbcr0 |= DBCR0_IAC3;
1091 } else if (!slot4_in_use) {
1092 slot = 4;
1093 child->thread.iac4 = bp_info->addr;
1094 child->thread.dbcr0 |= DBCR0_IAC4;
1095 #endif
1096 } else
1097 return -ENOSPC;
1098 }
1099 out:
1100 child->thread.dbcr0 |= DBCR0_IDM;
1101 child->thread.regs->msr |= MSR_DE;
1102
1103 return slot;
1104 }
1105
1106 static int del_instruction_bp(struct task_struct *child, int slot)
1107 {
1108 switch (slot) {
1109 case 1:
1110 if ((child->thread.dbcr0 & DBCR0_IAC1) == 0)
1111 return -ENOENT;
1112
1113 if (dbcr_iac_range(child) & DBCR_IAC12MODE) {
1114 /* address range - clear slots 1 & 2 */
1115 child->thread.iac2 = 0;
1116 dbcr_iac_range(child) &= ~DBCR_IAC12MODE;
1117 }
1118 child->thread.iac1 = 0;
1119 child->thread.dbcr0 &= ~DBCR0_IAC1;
1120 break;
1121 case 2:
1122 if ((child->thread.dbcr0 & DBCR0_IAC2) == 0)
1123 return -ENOENT;
1124
1125 if (dbcr_iac_range(child) & DBCR_IAC12MODE)
1126 /* used in a range */
1127 return -EINVAL;
1128 child->thread.iac2 = 0;
1129 child->thread.dbcr0 &= ~DBCR0_IAC2;
1130 break;
1131 #if CONFIG_PPC_ADV_DEBUG_IACS > 2
1132 case 3:
1133 if ((child->thread.dbcr0 & DBCR0_IAC3) == 0)
1134 return -ENOENT;
1135
1136 if (dbcr_iac_range(child) & DBCR_IAC34MODE) {
1137 /* address range - clear slots 3 & 4 */
1138 child->thread.iac4 = 0;
1139 dbcr_iac_range(child) &= ~DBCR_IAC34MODE;
1140 }
1141 child->thread.iac3 = 0;
1142 child->thread.dbcr0 &= ~DBCR0_IAC3;
1143 break;
1144 case 4:
1145 if ((child->thread.dbcr0 & DBCR0_IAC4) == 0)
1146 return -ENOENT;
1147
1148 if (dbcr_iac_range(child) & DBCR_IAC34MODE)
1149 /* Used in a range */
1150 return -EINVAL;
1151 child->thread.iac4 = 0;
1152 child->thread.dbcr0 &= ~DBCR0_IAC4;
1153 break;
1154 #endif
1155 default:
1156 return -EINVAL;
1157 }
1158 return 0;
1159 }
1160
1161 static int set_dac(struct task_struct *child, struct ppc_hw_breakpoint *bp_info)
1162 {
1163 int byte_enable =
1164 (bp_info->condition_mode >> PPC_BREAKPOINT_CONDITION_BE_SHIFT)
1165 & 0xf;
1166 int condition_mode =
1167 bp_info->condition_mode & PPC_BREAKPOINT_CONDITION_MODE;
1168 int slot;
1169
1170 if (byte_enable && (condition_mode == 0))
1171 return -EINVAL;
1172
1173 if (bp_info->addr >= TASK_SIZE)
1174 return -EIO;
1175
1176 if ((dbcr_dac(child) & (DBCR_DAC1R | DBCR_DAC1W)) == 0) {
1177 slot = 1;
1178 if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_READ)
1179 dbcr_dac(child) |= DBCR_DAC1R;
1180 if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_WRITE)
1181 dbcr_dac(child) |= DBCR_DAC1W;
1182 child->thread.dac1 = (unsigned long)bp_info->addr;
1183 #if CONFIG_PPC_ADV_DEBUG_DVCS > 0
1184 if (byte_enable) {
1185 child->thread.dvc1 =
1186 (unsigned long)bp_info->condition_value;
1187 child->thread.dbcr2 |=
1188 ((byte_enable << DBCR2_DVC1BE_SHIFT) |
1189 (condition_mode << DBCR2_DVC1M_SHIFT));
1190 }
1191 #endif
1192 #ifdef CONFIG_PPC_ADV_DEBUG_DAC_RANGE
1193 } else if (child->thread.dbcr2 & DBCR2_DAC12MODE) {
1194 /* Both dac1 and dac2 are part of a range */
1195 return -ENOSPC;
1196 #endif
1197 } else if ((dbcr_dac(child) & (DBCR_DAC2R | DBCR_DAC2W)) == 0) {
1198 slot = 2;
1199 if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_READ)
1200 dbcr_dac(child) |= DBCR_DAC2R;
1201 if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_WRITE)
1202 dbcr_dac(child) |= DBCR_DAC2W;
1203 child->thread.dac2 = (unsigned long)bp_info->addr;
1204 #if CONFIG_PPC_ADV_DEBUG_DVCS > 0
1205 if (byte_enable) {
1206 child->thread.dvc2 =
1207 (unsigned long)bp_info->condition_value;
1208 child->thread.dbcr2 |=
1209 ((byte_enable << DBCR2_DVC2BE_SHIFT) |
1210 (condition_mode << DBCR2_DVC2M_SHIFT));
1211 }
1212 #endif
1213 } else
1214 return -ENOSPC;
1215 child->thread.dbcr0 |= DBCR0_IDM;
1216 child->thread.regs->msr |= MSR_DE;
1217
1218 return slot + 4;
1219 }
1220
1221 static int del_dac(struct task_struct *child, int slot)
1222 {
1223 if (slot == 1) {
1224 if ((dbcr_dac(child) & (DBCR_DAC1R | DBCR_DAC1W)) == 0)
1225 return -ENOENT;
1226
1227 child->thread.dac1 = 0;
1228 dbcr_dac(child) &= ~(DBCR_DAC1R | DBCR_DAC1W);
1229 #ifdef CONFIG_PPC_ADV_DEBUG_DAC_RANGE
1230 if (child->thread.dbcr2 & DBCR2_DAC12MODE) {
1231 child->thread.dac2 = 0;
1232 child->thread.dbcr2 &= ~DBCR2_DAC12MODE;
1233 }
1234 child->thread.dbcr2 &= ~(DBCR2_DVC1M | DBCR2_DVC1BE);
1235 #endif
1236 #if CONFIG_PPC_ADV_DEBUG_DVCS > 0
1237 child->thread.dvc1 = 0;
1238 #endif
1239 } else if (slot == 2) {
1240 if ((dbcr_dac(child) & (DBCR_DAC2R | DBCR_DAC2W)) == 0)
1241 return -ENOENT;
1242
1243 #ifdef CONFIG_PPC_ADV_DEBUG_DAC_RANGE
1244 if (child->thread.dbcr2 & DBCR2_DAC12MODE)
1245 /* Part of a range */
1246 return -EINVAL;
1247 child->thread.dbcr2 &= ~(DBCR2_DVC2M | DBCR2_DVC2BE);
1248 #endif
1249 #if CONFIG_PPC_ADV_DEBUG_DVCS > 0
1250 child->thread.dvc2 = 0;
1251 #endif
1252 child->thread.dac2 = 0;
1253 dbcr_dac(child) &= ~(DBCR_DAC2R | DBCR_DAC2W);
1254 } else
1255 return -EINVAL;
1256
1257 return 0;
1258 }
1259 #endif /* CONFIG_PPC_ADV_DEBUG_REGS */
1260
1261 #ifdef CONFIG_PPC_ADV_DEBUG_DAC_RANGE
1262 static int set_dac_range(struct task_struct *child,
1263 struct ppc_hw_breakpoint *bp_info)
1264 {
1265 int mode = bp_info->addr_mode & PPC_BREAKPOINT_MODE_MASK;
1266
1267 /* We don't allow range watchpoints to be used with DVC */
1268 if (bp_info->condition_mode)
1269 return -EINVAL;
1270
1271 /*
1272 * Best effort to verify the address range. The user/supervisor bits
1273 * prevent trapping in kernel space, but let's fail on an obvious bad
1274 * range. The simple test on the mask is not fool-proof, and any
1275 * exclusive range will spill over into kernel space.
1276 */
1277 if (bp_info->addr >= TASK_SIZE)
1278 return -EIO;
1279 if (mode == PPC_BREAKPOINT_MODE_MASK) {
1280 /*
1281 * dac2 is a bitmask. Don't allow a mask that makes a
1282 * kernel space address from a valid dac1 value
1283 */
1284 if (~((unsigned long)bp_info->addr2) >= TASK_SIZE)
1285 return -EIO;
1286 } else {
1287 /*
1288 * For range breakpoints, addr2 must also be a valid address
1289 */
1290 if (bp_info->addr2 >= TASK_SIZE)
1291 return -EIO;
1292 }
1293
1294 if (child->thread.dbcr0 &
1295 (DBCR0_DAC1R | DBCR0_DAC1W | DBCR0_DAC2R | DBCR0_DAC2W))
1296 return -ENOSPC;
1297
1298 if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_READ)
1299 child->thread.dbcr0 |= (DBCR0_DAC1R | DBCR0_IDM);
1300 if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_WRITE)
1301 child->thread.dbcr0 |= (DBCR0_DAC1W | DBCR0_IDM);
1302 child->thread.dac1 = bp_info->addr;
1303 child->thread.dac2 = bp_info->addr2;
1304 if (mode == PPC_BREAKPOINT_MODE_RANGE_INCLUSIVE)
1305 child->thread.dbcr2 |= DBCR2_DAC12M;
1306 else if (mode == PPC_BREAKPOINT_MODE_RANGE_EXCLUSIVE)
1307 child->thread.dbcr2 |= DBCR2_DAC12MX;
1308 else /* PPC_BREAKPOINT_MODE_MASK */
1309 child->thread.dbcr2 |= DBCR2_DAC12MM;
1310 child->thread.regs->msr |= MSR_DE;
1311
1312 return 5;
1313 }
1314 #endif /* CONFIG_PPC_ADV_DEBUG_DAC_RANGE */
1315
1316 static long ppc_set_hwdebug(struct task_struct *child,
1317 struct ppc_hw_breakpoint *bp_info)
1318 {
1319 #ifndef CONFIG_PPC_ADV_DEBUG_REGS
1320 unsigned long dabr;
1321 #endif
1322
1323 if (bp_info->version != 1)
1324 return -ENOTSUPP;
1325 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
1326 /*
1327 * Check for invalid flags and combinations
1328 */
1329 if ((bp_info->trigger_type == 0) ||
1330 (bp_info->trigger_type & ~(PPC_BREAKPOINT_TRIGGER_EXECUTE |
1331 PPC_BREAKPOINT_TRIGGER_RW)) ||
1332 (bp_info->addr_mode & ~PPC_BREAKPOINT_MODE_MASK) ||
1333 (bp_info->condition_mode &
1334 ~(PPC_BREAKPOINT_CONDITION_MODE |
1335 PPC_BREAKPOINT_CONDITION_BE_ALL)))
1336 return -EINVAL;
1337 #if CONFIG_PPC_ADV_DEBUG_DVCS == 0
1338 if (bp_info->condition_mode != PPC_BREAKPOINT_CONDITION_NONE)
1339 return -EINVAL;
1340 #endif
1341
1342 if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_EXECUTE) {
1343 if ((bp_info->trigger_type != PPC_BREAKPOINT_TRIGGER_EXECUTE) ||
1344 (bp_info->condition_mode != PPC_BREAKPOINT_CONDITION_NONE))
1345 return -EINVAL;
1346 return set_intruction_bp(child, bp_info);
1347 }
1348 if (bp_info->addr_mode == PPC_BREAKPOINT_MODE_EXACT)
1349 return set_dac(child, bp_info);
1350
1351 #ifdef CONFIG_PPC_ADV_DEBUG_DAC_RANGE
1352 return set_dac_range(child, bp_info);
1353 #else
1354 return -EINVAL;
1355 #endif
1356 #else /* !CONFIG_PPC_ADV_DEBUG_DVCS */
1357 /*
1358 * We only support one data breakpoint
1359 */
1360 if ((bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_RW) == 0 ||
1361 (bp_info->trigger_type & ~PPC_BREAKPOINT_TRIGGER_RW) != 0 ||
1362 bp_info->addr_mode != PPC_BREAKPOINT_MODE_EXACT ||
1363 bp_info->condition_mode != PPC_BREAKPOINT_CONDITION_NONE)
1364 return -EINVAL;
1365
1366 if (child->thread.dabr)
1367 return -ENOSPC;
1368
1369 if ((unsigned long)bp_info->addr >= TASK_SIZE)
1370 return -EIO;
1371
1372 dabr = (unsigned long)bp_info->addr & ~7UL;
1373 dabr |= DABR_TRANSLATION;
1374 if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_READ)
1375 dabr |= DABR_DATA_READ;
1376 if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_WRITE)
1377 dabr |= DABR_DATA_WRITE;
1378
1379 child->thread.dabr = dabr;
1380
1381 return 1;
1382 #endif /* !CONFIG_PPC_ADV_DEBUG_DVCS */
1383 }
1384
1385 static long ppc_del_hwdebug(struct task_struct *child, long addr, long data)
1386 {
1387 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
1388 int rc;
1389
1390 if (data <= 4)
1391 rc = del_instruction_bp(child, (int)data);
1392 else
1393 rc = del_dac(child, (int)data - 4);
1394
1395 if (!rc) {
1396 if (!DBCR_ACTIVE_EVENTS(child->thread.dbcr0,
1397 child->thread.dbcr1)) {
1398 child->thread.dbcr0 &= ~DBCR0_IDM;
1399 child->thread.regs->msr &= ~MSR_DE;
1400 }
1401 }
1402 return rc;
1403 #else
1404 if (data != 1)
1405 return -EINVAL;
1406 if (child->thread.dabr == 0)
1407 return -ENOENT;
1408
1409 child->thread.dabr = 0;
1410
1411 return 0;
1412 #endif
1413 }
1414
1415 /*
1416 * Here are the old "legacy" powerpc specific getregs/setregs ptrace calls,
1417 * we mark them as obsolete now, they will be removed in a future version
1418 */
1419 static long arch_ptrace_old(struct task_struct *child, long request,
1420 unsigned long addr, unsigned long data)
1421 {
1422 void __user *datavp = (void __user *) data;
1423
1424 switch (request) {
1425 case PPC_PTRACE_GETREGS: /* Get GPRs 0 - 31. */
1426 return copy_regset_to_user(child, &user_ppc_native_view,
1427 REGSET_GPR, 0, 32 * sizeof(long),
1428 datavp);
1429
1430 case PPC_PTRACE_SETREGS: /* Set GPRs 0 - 31. */
1431 return copy_regset_from_user(child, &user_ppc_native_view,
1432 REGSET_GPR, 0, 32 * sizeof(long),
1433 datavp);
1434
1435 case PPC_PTRACE_GETFPREGS: /* Get FPRs 0 - 31. */
1436 return copy_regset_to_user(child, &user_ppc_native_view,
1437 REGSET_FPR, 0, 32 * sizeof(double),
1438 datavp);
1439
1440 case PPC_PTRACE_SETFPREGS: /* Set FPRs 0 - 31. */
1441 return copy_regset_from_user(child, &user_ppc_native_view,
1442 REGSET_FPR, 0, 32 * sizeof(double),
1443 datavp);
1444 }
1445
1446 return -EPERM;
1447 }
1448
1449 long arch_ptrace(struct task_struct *child, long request,
1450 unsigned long addr, unsigned long data)
1451 {
1452 int ret = -EPERM;
1453 void __user *datavp = (void __user *) data;
1454 unsigned long __user *datalp = datavp;
1455
1456 switch (request) {
1457 /* read the word at location addr in the USER area. */
1458 case PTRACE_PEEKUSR: {
1459 unsigned long index, tmp;
1460
1461 ret = -EIO;
1462 /* convert to index and check */
1463 #ifdef CONFIG_PPC32
1464 index = addr >> 2;
1465 if ((addr & 3) || (index > PT_FPSCR)
1466 || (child->thread.regs == NULL))
1467 #else
1468 index = addr >> 3;
1469 if ((addr & 7) || (index > PT_FPSCR))
1470 #endif
1471 break;
1472
1473 CHECK_FULL_REGS(child->thread.regs);
1474 if (index < PT_FPR0) {
1475 tmp = ptrace_get_reg(child, (int) index);
1476 } else {
1477 flush_fp_to_thread(child);
1478 tmp = ((unsigned long *)child->thread.fpr)
1479 [TS_FPRWIDTH * (index - PT_FPR0)];
1480 }
1481 ret = put_user(tmp, datalp);
1482 break;
1483 }
1484
1485 /* write the word at location addr in the USER area */
1486 case PTRACE_POKEUSR: {
1487 unsigned long index;
1488
1489 ret = -EIO;
1490 /* convert to index and check */
1491 #ifdef CONFIG_PPC32
1492 index = addr >> 2;
1493 if ((addr & 3) || (index > PT_FPSCR)
1494 || (child->thread.regs == NULL))
1495 #else
1496 index = addr >> 3;
1497 if ((addr & 7) || (index > PT_FPSCR))
1498 #endif
1499 break;
1500
1501 CHECK_FULL_REGS(child->thread.regs);
1502 if (index < PT_FPR0) {
1503 ret = ptrace_put_reg(child, index, data);
1504 } else {
1505 flush_fp_to_thread(child);
1506 ((unsigned long *)child->thread.fpr)
1507 [TS_FPRWIDTH * (index - PT_FPR0)] = data;
1508 ret = 0;
1509 }
1510 break;
1511 }
1512
1513 case PPC_PTRACE_GETHWDBGINFO: {
1514 struct ppc_debug_info dbginfo;
1515
1516 dbginfo.version = 1;
1517 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
1518 dbginfo.num_instruction_bps = CONFIG_PPC_ADV_DEBUG_IACS;
1519 dbginfo.num_data_bps = CONFIG_PPC_ADV_DEBUG_DACS;
1520 dbginfo.num_condition_regs = CONFIG_PPC_ADV_DEBUG_DVCS;
1521 dbginfo.data_bp_alignment = 4;
1522 dbginfo.sizeof_condition = 4;
1523 dbginfo.features = PPC_DEBUG_FEATURE_INSN_BP_RANGE |
1524 PPC_DEBUG_FEATURE_INSN_BP_MASK;
1525 #ifdef CONFIG_PPC_ADV_DEBUG_DAC_RANGE
1526 dbginfo.features |=
1527 PPC_DEBUG_FEATURE_DATA_BP_RANGE |
1528 PPC_DEBUG_FEATURE_DATA_BP_MASK;
1529 #endif
1530 #else /* !CONFIG_PPC_ADV_DEBUG_REGS */
1531 dbginfo.num_instruction_bps = 0;
1532 dbginfo.num_data_bps = 1;
1533 dbginfo.num_condition_regs = 0;
1534 #ifdef CONFIG_PPC64
1535 dbginfo.data_bp_alignment = 8;
1536 #else
1537 dbginfo.data_bp_alignment = 4;
1538 #endif
1539 dbginfo.sizeof_condition = 0;
1540 dbginfo.features = 0;
1541 #endif /* CONFIG_PPC_ADV_DEBUG_REGS */
1542
1543 if (!access_ok(VERIFY_WRITE, datavp,
1544 sizeof(struct ppc_debug_info)))
1545 return -EFAULT;
1546 ret = __copy_to_user(datavp, &dbginfo,
1547 sizeof(struct ppc_debug_info)) ?
1548 -EFAULT : 0;
1549 break;
1550 }
1551
1552 case PPC_PTRACE_SETHWDEBUG: {
1553 struct ppc_hw_breakpoint bp_info;
1554
1555 if (!access_ok(VERIFY_READ, datavp,
1556 sizeof(struct ppc_hw_breakpoint)))
1557 return -EFAULT;
1558 ret = __copy_from_user(&bp_info, datavp,
1559 sizeof(struct ppc_hw_breakpoint)) ?
1560 -EFAULT : 0;
1561 if (!ret)
1562 ret = ppc_set_hwdebug(child, &bp_info);
1563 break;
1564 }
1565
1566 case PPC_PTRACE_DELHWDEBUG: {
1567 ret = ppc_del_hwdebug(child, addr, data);
1568 break;
1569 }
1570
1571 case PTRACE_GET_DEBUGREG: {
1572 ret = -EINVAL;
1573 /* We only support one DABR and no IABRS at the moment */
1574 if (addr > 0)
1575 break;
1576 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
1577 ret = put_user(child->thread.dac1, datalp);
1578 #else
1579 ret = put_user(child->thread.dabr, datalp);
1580 #endif
1581 break;
1582 }
1583
1584 case PTRACE_SET_DEBUGREG:
1585 ret = ptrace_set_debugreg(child, addr, data);
1586 break;
1587
1588 #ifdef CONFIG_PPC64
1589 case PTRACE_GETREGS64:
1590 #endif
1591 case PTRACE_GETREGS: /* Get all pt_regs from the child. */
1592 return copy_regset_to_user(child, &user_ppc_native_view,
1593 REGSET_GPR,
1594 0, sizeof(struct pt_regs),
1595 datavp);
1596
1597 #ifdef CONFIG_PPC64
1598 case PTRACE_SETREGS64:
1599 #endif
1600 case PTRACE_SETREGS: /* Set all gp regs in the child. */
1601 return copy_regset_from_user(child, &user_ppc_native_view,
1602 REGSET_GPR,
1603 0, sizeof(struct pt_regs),
1604 datavp);
1605
1606 case PTRACE_GETFPREGS: /* Get the child FPU state (FPR0...31 + FPSCR) */
1607 return copy_regset_to_user(child, &user_ppc_native_view,
1608 REGSET_FPR,
1609 0, sizeof(elf_fpregset_t),
1610 datavp);
1611
1612 case PTRACE_SETFPREGS: /* Set the child FPU state (FPR0...31 + FPSCR) */
1613 return copy_regset_from_user(child, &user_ppc_native_view,
1614 REGSET_FPR,
1615 0, sizeof(elf_fpregset_t),
1616 datavp);
1617
1618 #ifdef CONFIG_ALTIVEC
1619 case PTRACE_GETVRREGS:
1620 return copy_regset_to_user(child, &user_ppc_native_view,
1621 REGSET_VMX,
1622 0, (33 * sizeof(vector128) +
1623 sizeof(u32)),
1624 datavp);
1625
1626 case PTRACE_SETVRREGS:
1627 return copy_regset_from_user(child, &user_ppc_native_view,
1628 REGSET_VMX,
1629 0, (33 * sizeof(vector128) +
1630 sizeof(u32)),
1631 datavp);
1632 #endif
1633 #ifdef CONFIG_VSX
1634 case PTRACE_GETVSRREGS:
1635 return copy_regset_to_user(child, &user_ppc_native_view,
1636 REGSET_VSX,
1637 0, 32 * sizeof(double),
1638 datavp);
1639
1640 case PTRACE_SETVSRREGS:
1641 return copy_regset_from_user(child, &user_ppc_native_view,
1642 REGSET_VSX,
1643 0, 32 * sizeof(double),
1644 datavp);
1645 #endif
1646 #ifdef CONFIG_SPE
1647 case PTRACE_GETEVRREGS:
1648 /* Get the child spe register state. */
1649 return copy_regset_to_user(child, &user_ppc_native_view,
1650 REGSET_SPE, 0, 35 * sizeof(u32),
1651 datavp);
1652
1653 case PTRACE_SETEVRREGS:
1654 /* Set the child spe register state. */
1655 return copy_regset_from_user(child, &user_ppc_native_view,
1656 REGSET_SPE, 0, 35 * sizeof(u32),
1657 datavp);
1658 #endif
1659
1660 /* Old reverse args ptrace callss */
1661 case PPC_PTRACE_GETREGS: /* Get GPRs 0 - 31. */
1662 case PPC_PTRACE_SETREGS: /* Set GPRs 0 - 31. */
1663 case PPC_PTRACE_GETFPREGS: /* Get FPRs 0 - 31. */
1664 case PPC_PTRACE_SETFPREGS: /* Get FPRs 0 - 31. */
1665 ret = arch_ptrace_old(child, request, addr, data);
1666 break;
1667
1668 default:
1669 ret = ptrace_request(child, request, addr, data);
1670 break;
1671 }
1672 return ret;
1673 }
1674
1675 /*
1676 * We must return the syscall number to actually look up in the table.
1677 * This can be -1L to skip running any syscall at all.
1678 */
1679 long do_syscall_trace_enter(struct pt_regs *regs)
1680 {
1681 long ret = 0;
1682
1683 secure_computing(regs->gpr[0]);
1684
1685 if (test_thread_flag(TIF_SYSCALL_TRACE) &&
1686 tracehook_report_syscall_entry(regs))
1687 /*
1688 * Tracing decided this syscall should not happen.
1689 * We'll return a bogus call number to get an ENOSYS
1690 * error, but leave the original number in regs->gpr[0].
1691 */
1692 ret = -1L;
1693
1694 if (unlikely(current->audit_context)) {
1695 #ifdef CONFIG_PPC64
1696 if (!is_32bit_task())
1697 audit_syscall_entry(AUDIT_ARCH_PPC64,
1698 regs->gpr[0],
1699 regs->gpr[3], regs->gpr[4],
1700 regs->gpr[5], regs->gpr[6]);
1701 else
1702 #endif
1703 audit_syscall_entry(AUDIT_ARCH_PPC,
1704 regs->gpr[0],
1705 regs->gpr[3] & 0xffffffff,
1706 regs->gpr[4] & 0xffffffff,
1707 regs->gpr[5] & 0xffffffff,
1708 regs->gpr[6] & 0xffffffff);
1709 }
1710
1711 return ret ?: regs->gpr[0];
1712 }
1713
1714 void do_syscall_trace_leave(struct pt_regs *regs)
1715 {
1716 int step;
1717
1718 if (unlikely(current->audit_context))
1719 audit_syscall_exit((regs->ccr&0x10000000)?AUDITSC_FAILURE:AUDITSC_SUCCESS,
1720 regs->result);
1721
1722 step = test_thread_flag(TIF_SINGLESTEP);
1723 if (step || test_thread_flag(TIF_SYSCALL_TRACE))
1724 tracehook_report_syscall_exit(regs, step);
1725 }
Linux kernel - Deliverables
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