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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/elf.h>
26 #include <linux/user.h>
27 #include <linux/security.h>
28 #include <linux/signal.h>
29 #include <linux/seccomp.h>
30 #include <linux/audit.h>
31 #ifdef CONFIG_PPC32
32 #include <linux/module.h>
33 #endif
34
35 #include <asm/uaccess.h>
36 #include <asm/page.h>
37 #include <asm/pgtable.h>
38 #include <asm/system.h>
39
40 /*
41  * does not yet catch signals sent when the child dies.
42  * in exit.c or in signal.c.
43  */
44
45 /*
46  * Set of msr bits that gdb can change on behalf of a process.
47  */
48 #if defined(CONFIG_40x) || defined(CONFIG_BOOKE)
49 #define MSR_DEBUGCHANGE 0
50 #else
51 #define MSR_DEBUGCHANGE (MSR_SE | MSR_BE)
52 #endif
53
54 /*
55  * Max register writeable via put_reg
56  */
57 #ifdef CONFIG_PPC32
58 #define PT_MAX_PUT_REG  PT_MQ
59 #else
60 #define PT_MAX_PUT_REG  PT_CCR
61 #endif
62
63 static unsigned long get_user_msr(struct task_struct *task)
64 {
65         return task->thread.regs->msr | task->thread.fpexc_mode;
66 }
67
68 static int set_user_msr(struct task_struct *task, unsigned long msr)
69 {
70         task->thread.regs->msr &= ~MSR_DEBUGCHANGE;
71         task->thread.regs->msr |= msr & MSR_DEBUGCHANGE;
72         return 0;
73 }
74
75 /*
76  * We prevent mucking around with the reserved area of trap
77  * which are used internally by the kernel.
78  */
79 static int set_user_trap(struct task_struct *task, unsigned long trap)
80 {
81         task->thread.regs->trap = trap & 0xfff0;
82         return 0;
83 }
84
85 /*
86  * Get contents of register REGNO in task TASK.
87  */
88 unsigned long ptrace_get_reg(struct task_struct *task, int regno)
89 {
90         if (task->thread.regs == NULL)
91                 return -EIO;
92
93         if (regno == PT_MSR)
94                 return get_user_msr(task);
95
96         if (regno < (sizeof(struct pt_regs) / sizeof(unsigned long)))
97                 return ((unsigned long *)task->thread.regs)[regno];
98
99         return -EIO;
100 }
101
102 /*
103  * Write contents of register REGNO in task TASK.
104  */
105 int ptrace_put_reg(struct task_struct *task, int regno, unsigned long data)
106 {
107         if (task->thread.regs == NULL)
108                 return -EIO;
109
110         if (regno == PT_MSR)
111                 return set_user_msr(task, data);
112         if (regno == PT_TRAP)
113                 return set_user_trap(task, data);
114
115         if (regno <= PT_MAX_PUT_REG) {
116                 ((unsigned long *)task->thread.regs)[regno] = data;
117                 return 0;
118         }
119         return -EIO;
120 }
121
122 static int gpr_get(struct task_struct *target, const struct user_regset *regset,
123                    unsigned int pos, unsigned int count,
124                    void *kbuf, void __user *ubuf)
125 {
126         int ret;
127
128         if (target->thread.regs == NULL)
129                 return -EIO;
130
131         CHECK_FULL_REGS(target->thread.regs);
132
133         ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
134                                   target->thread.regs,
135                                   0, offsetof(struct pt_regs, msr));
136         if (!ret) {
137                 unsigned long msr = get_user_msr(target);
138                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &msr,
139                                           offsetof(struct pt_regs, msr),
140                                           offsetof(struct pt_regs, msr) +
141                                           sizeof(msr));
142         }
143
144         BUILD_BUG_ON(offsetof(struct pt_regs, orig_gpr3) !=
145                      offsetof(struct pt_regs, msr) + sizeof(long));
146
147         if (!ret)
148                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
149                                           &target->thread.regs->orig_gpr3,
150                                           offsetof(struct pt_regs, orig_gpr3),
151                                           sizeof(struct pt_regs));
152         if (!ret)
153                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
154                                                sizeof(struct pt_regs), -1);
155
156         return ret;
157 }
158
159 static int gpr_set(struct task_struct *target, const struct user_regset *regset,
160                    unsigned int pos, unsigned int count,
161                    const void *kbuf, const void __user *ubuf)
162 {
163         unsigned long reg;
164         int ret;
165
166         if (target->thread.regs == NULL)
167                 return -EIO;
168
169         CHECK_FULL_REGS(target->thread.regs);
170
171         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
172                                  target->thread.regs,
173                                  0, PT_MSR * sizeof(reg));
174
175         if (!ret && count > 0) {
176                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &reg,
177                                          PT_MSR * sizeof(reg),
178                                          (PT_MSR + 1) * sizeof(reg));
179                 if (!ret)
180                         ret = set_user_msr(target, reg);
181         }
182
183         BUILD_BUG_ON(offsetof(struct pt_regs, orig_gpr3) !=
184                      offsetof(struct pt_regs, msr) + sizeof(long));
185
186         if (!ret)
187                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
188                                          &target->thread.regs->orig_gpr3,
189                                          PT_ORIG_R3 * sizeof(reg),
190                                          (PT_MAX_PUT_REG + 1) * sizeof(reg));
191
192         if (PT_MAX_PUT_REG + 1 < PT_TRAP && !ret)
193                 ret = user_regset_copyin_ignore(
194                         &pos, &count, &kbuf, &ubuf,
195                         (PT_MAX_PUT_REG + 1) * sizeof(reg),
196                         PT_TRAP * sizeof(reg));
197
198         if (!ret && count > 0) {
199                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &reg,
200                                          PT_TRAP * sizeof(reg),
201                                          (PT_TRAP + 1) * sizeof(reg));
202                 if (!ret)
203                         ret = set_user_trap(target, reg);
204         }
205
206         if (!ret)
207                 ret = user_regset_copyin_ignore(
208                         &pos, &count, &kbuf, &ubuf,
209                         (PT_TRAP + 1) * sizeof(reg), -1);
210
211         return ret;
212 }
213
214 static int fpr_get(struct task_struct *target, const struct user_regset *regset,
215                    unsigned int pos, unsigned int count,
216                    void *kbuf, void __user *ubuf)
217 {
218 #ifdef CONFIG_VSX
219         double buf[33];
220         int i;
221 #endif
222         flush_fp_to_thread(target);
223
224 #ifdef CONFIG_VSX
225         /* copy to local buffer then write that out */
226         for (i = 0; i < 32 ; i++)
227                 buf[i] = target->thread.TS_FPR(i);
228         memcpy(&buf[32], &target->thread.fpscr, sizeof(double));
229         return user_regset_copyout(&pos, &count, &kbuf, &ubuf, buf, 0, -1);
230
231 #else
232         BUILD_BUG_ON(offsetof(struct thread_struct, fpscr) !=
233                      offsetof(struct thread_struct, TS_FPR(32)));
234
235         return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
236                                    &target->thread.fpr, 0, -1);
237 #endif
238 }
239
240 static int fpr_set(struct task_struct *target, const struct user_regset *regset,
241                    unsigned int pos, unsigned int count,
242                    const void *kbuf, const void __user *ubuf)
243 {
244 #ifdef CONFIG_VSX
245         double buf[33];
246         int i;
247 #endif
248         flush_fp_to_thread(target);
249
250 #ifdef CONFIG_VSX
251         /* copy to local buffer then write that out */
252         i = user_regset_copyin(&pos, &count, &kbuf, &ubuf, buf, 0, -1);
253         if (i)
254                 return i;
255         for (i = 0; i < 32 ; i++)
256                 target->thread.TS_FPR(i) = buf[i];
257         memcpy(&target->thread.fpscr, &buf[32], sizeof(double));
258         return 0;
259 #else
260         BUILD_BUG_ON(offsetof(struct thread_struct, fpscr) !=
261                      offsetof(struct thread_struct, TS_FPR(32)));
262
263         return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
264                                   &target->thread.fpr, 0, -1);
265 #endif
266 }
267
268 #ifdef CONFIG_ALTIVEC
269 /*
270  * Get/set all the altivec registers vr0..vr31, vscr, vrsave, in one go.
271  * The transfer totals 34 quadword.  Quadwords 0-31 contain the
272  * corresponding vector registers.  Quadword 32 contains the vscr as the
273  * last word (offset 12) within that quadword.  Quadword 33 contains the
274  * vrsave as the first word (offset 0) within the quadword.
275  *
276  * This definition of the VMX state is compatible with the current PPC32
277  * ptrace interface.  This allows signal handling and ptrace to use the
278  * same structures.  This also simplifies the implementation of a bi-arch
279  * (combined (32- and 64-bit) gdb.
280  */
281
282 static int vr_active(struct task_struct *target,
283                      const struct user_regset *regset)
284 {
285         flush_altivec_to_thread(target);
286         return target->thread.used_vr ? regset->n : 0;
287 }
288
289 static int vr_get(struct task_struct *target, const struct user_regset *regset,
290                   unsigned int pos, unsigned int count,
291                   void *kbuf, void __user *ubuf)
292 {
293         int ret;
294
295         flush_altivec_to_thread(target);
296
297         BUILD_BUG_ON(offsetof(struct thread_struct, vscr) !=
298                      offsetof(struct thread_struct, vr[32]));
299
300         ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
301                                   &target->thread.vr, 0,
302                                   33 * sizeof(vector128));
303         if (!ret) {
304                 /*
305                  * Copy out only the low-order word of vrsave.
306                  */
307                 union {
308                         elf_vrreg_t reg;
309                         u32 word;
310                 } vrsave;
311                 memset(&vrsave, 0, sizeof(vrsave));
312                 vrsave.word = target->thread.vrsave;
313                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &vrsave,
314                                           33 * sizeof(vector128), -1);
315         }
316
317         return ret;
318 }
319
320 static int vr_set(struct task_struct *target, const struct user_regset *regset,
321                   unsigned int pos, unsigned int count,
322                   const void *kbuf, const void __user *ubuf)
323 {
324         int ret;
325
326         flush_altivec_to_thread(target);
327
328         BUILD_BUG_ON(offsetof(struct thread_struct, vscr) !=
329                      offsetof(struct thread_struct, vr[32]));
330
331         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
332                                  &target->thread.vr, 0, 33 * sizeof(vector128));
333         if (!ret && count > 0) {
334                 /*
335                  * We use only the first word of vrsave.
336                  */
337                 union {
338                         elf_vrreg_t reg;
339                         u32 word;
340                 } vrsave;
341                 memset(&vrsave, 0, sizeof(vrsave));
342                 vrsave.word = target->thread.vrsave;
343                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &vrsave,
344                                          33 * sizeof(vector128), -1);
345                 if (!ret)
346                         target->thread.vrsave = vrsave.word;
347         }
348
349         return ret;
350 }
351 #endif /* CONFIG_ALTIVEC */
352
353 #ifdef CONFIG_VSX
354 /*
355  * Currently to set and and get all the vsx state, you need to call
356  * the fp and VMX calls aswell.  This only get/sets the lower 32
357  * 128bit VSX registers.
358  */
359
360 static int vsr_active(struct task_struct *target,
361                       const struct user_regset *regset)
362 {
363         flush_vsx_to_thread(target);
364         return target->thread.used_vsr ? regset->n : 0;
365 }
366
367 static int vsr_get(struct task_struct *target, const struct user_regset *regset,
368                    unsigned int pos, unsigned int count,
369                    void *kbuf, void __user *ubuf)
370 {
371         double buf[32];
372         int ret, i;
373
374         flush_vsx_to_thread(target);
375
376         for (i = 0; i < 32 ; i++)
377                 buf[i] = current->thread.fpr[i][TS_VSRLOWOFFSET];
378         ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
379                                   buf, 0, 32 * sizeof(double));
380
381         return ret;
382 }
383
384 static int vsr_set(struct task_struct *target, const struct user_regset *regset,
385                    unsigned int pos, unsigned int count,
386                    const void *kbuf, const void __user *ubuf)
387 {
388         double buf[32];
389         int ret,i;
390
391         flush_vsx_to_thread(target);
392
393         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
394                                  buf, 0, 32 * sizeof(double));
395         for (i = 0; i < 32 ; i++)
396                 current->thread.fpr[i][TS_VSRLOWOFFSET] = buf[i];
397
398
399         return ret;
400 }
401 #endif /* CONFIG_VSX */
402
403 #ifdef CONFIG_SPE
404
405 /*
406  * For get_evrregs/set_evrregs functions 'data' has the following layout:
407  *
408  * struct {
409  *   u32 evr[32];
410  *   u64 acc;
411  *   u32 spefscr;
412  * }
413  */
414
415 static int evr_active(struct task_struct *target,
416                       const struct user_regset *regset)
417 {
418         flush_spe_to_thread(target);
419         return target->thread.used_spe ? regset->n : 0;
420 }
421
422 static int evr_get(struct task_struct *target, const struct user_regset *regset,
423                    unsigned int pos, unsigned int count,
424                    void *kbuf, void __user *ubuf)
425 {
426         int ret;
427
428         flush_spe_to_thread(target);
429
430         ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
431                                   &target->thread.evr,
432                                   0, sizeof(target->thread.evr));
433
434         BUILD_BUG_ON(offsetof(struct thread_struct, acc) + sizeof(u64) !=
435                      offsetof(struct thread_struct, spefscr));
436
437         if (!ret)
438                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
439                                           &target->thread.acc,
440                                           sizeof(target->thread.evr), -1);
441
442         return ret;
443 }
444
445 static int evr_set(struct task_struct *target, const struct user_regset *regset,
446                    unsigned int pos, unsigned int count,
447                    const void *kbuf, const void __user *ubuf)
448 {
449         int ret;
450
451         flush_spe_to_thread(target);
452
453         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
454                                  &target->thread.evr,
455                                  0, sizeof(target->thread.evr));
456
457         BUILD_BUG_ON(offsetof(struct thread_struct, acc) + sizeof(u64) !=
458                      offsetof(struct thread_struct, spefscr));
459
460         if (!ret)
461                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
462                                          &target->thread.acc,
463                                          sizeof(target->thread.evr), -1);
464
465         return ret;
466 }
467 #endif /* CONFIG_SPE */
468
469
470 /*
471  * These are our native regset flavors.
472  */
473 enum powerpc_regset {
474         REGSET_GPR,
475         REGSET_FPR,
476 #ifdef CONFIG_ALTIVEC
477         REGSET_VMX,
478 #endif
479 #ifdef CONFIG_VSX
480         REGSET_VSX,
481 #endif
482 #ifdef CONFIG_SPE
483         REGSET_SPE,
484 #endif
485 };
486
487 static const struct user_regset native_regsets[] = {
488         [REGSET_GPR] = {
489                 .core_note_type = NT_PRSTATUS, .n = ELF_NGREG,
490                 .size = sizeof(long), .align = sizeof(long),
491                 .get = gpr_get, .set = gpr_set
492         },
493         [REGSET_FPR] = {
494                 .core_note_type = NT_PRFPREG, .n = ELF_NFPREG,
495                 .size = sizeof(double), .align = sizeof(double),
496                 .get = fpr_get, .set = fpr_set
497         },
498 #ifdef CONFIG_ALTIVEC
499         [REGSET_VMX] = {
500                 .core_note_type = NT_PPC_VMX, .n = 34,
501                 .size = sizeof(vector128), .align = sizeof(vector128),
502                 .active = vr_active, .get = vr_get, .set = vr_set
503         },
504 #endif
505 #ifdef CONFIG_VSX
506         [REGSET_VSX] = {
507                 .core_note_type = NT_PPC_VSX, .n = 32,
508                 .size = sizeof(double), .align = sizeof(double),
509                 .active = vsr_active, .get = vsr_get, .set = vsr_set
510         },
511 #endif
512 #ifdef CONFIG_SPE
513         [REGSET_SPE] = {
514                 .n = 35,
515                 .size = sizeof(u32), .align = sizeof(u32),
516                 .active = evr_active, .get = evr_get, .set = evr_set
517         },
518 #endif
519 };
520
521 static const struct user_regset_view user_ppc_native_view = {
522         .name = UTS_MACHINE, .e_machine = ELF_ARCH, .ei_osabi = ELF_OSABI,
523         .regsets = native_regsets, .n = ARRAY_SIZE(native_regsets)
524 };
525
526 #ifdef CONFIG_PPC64
527 #include <linux/compat.h>
528
529 static int gpr32_get(struct task_struct *target,
530                      const struct user_regset *regset,
531                      unsigned int pos, unsigned int count,
532                      void *kbuf, void __user *ubuf)
533 {
534         const unsigned long *regs = &target->thread.regs->gpr[0];
535         compat_ulong_t *k = kbuf;
536         compat_ulong_t __user *u = ubuf;
537         compat_ulong_t reg;
538
539         if (target->thread.regs == NULL)
540                 return -EIO;
541
542         CHECK_FULL_REGS(target->thread.regs);
543
544         pos /= sizeof(reg);
545         count /= sizeof(reg);
546
547         if (kbuf)
548                 for (; count > 0 && pos < PT_MSR; --count)
549                         *k++ = regs[pos++];
550         else
551                 for (; count > 0 && pos < PT_MSR; --count)
552                         if (__put_user((compat_ulong_t) regs[pos++], u++))
553                                 return -EFAULT;
554
555         if (count > 0 && pos == PT_MSR) {
556                 reg = get_user_msr(target);
557                 if (kbuf)
558                         *k++ = reg;
559                 else if (__put_user(reg, u++))
560                         return -EFAULT;
561                 ++pos;
562                 --count;
563         }
564
565         if (kbuf)
566                 for (; count > 0 && pos < PT_REGS_COUNT; --count)
567                         *k++ = regs[pos++];
568         else
569                 for (; count > 0 && pos < PT_REGS_COUNT; --count)
570                         if (__put_user((compat_ulong_t) regs[pos++], u++))
571                                 return -EFAULT;
572
573         kbuf = k;
574         ubuf = u;
575         pos *= sizeof(reg);
576         count *= sizeof(reg);
577         return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
578                                         PT_REGS_COUNT * sizeof(reg), -1);
579 }
580
581 static int gpr32_set(struct task_struct *target,
582                      const struct user_regset *regset,
583                      unsigned int pos, unsigned int count,
584                      const void *kbuf, const void __user *ubuf)
585 {
586         unsigned long *regs = &target->thread.regs->gpr[0];
587         const compat_ulong_t *k = kbuf;
588         const compat_ulong_t __user *u = ubuf;
589         compat_ulong_t reg;
590
591         if (target->thread.regs == NULL)
592                 return -EIO;
593
594         CHECK_FULL_REGS(target->thread.regs);
595
596         pos /= sizeof(reg);
597         count /= sizeof(reg);
598
599         if (kbuf)
600                 for (; count > 0 && pos < PT_MSR; --count)
601                         regs[pos++] = *k++;
602         else
603                 for (; count > 0 && pos < PT_MSR; --count) {
604                         if (__get_user(reg, u++))
605                                 return -EFAULT;
606                         regs[pos++] = reg;
607                 }
608
609
610         if (count > 0 && pos == PT_MSR) {
611                 if (kbuf)
612                         reg = *k++;
613                 else if (__get_user(reg, u++))
614                         return -EFAULT;
615                 set_user_msr(target, reg);
616                 ++pos;
617                 --count;
618         }
619
620         if (kbuf) {
621                 for (; count > 0 && pos <= PT_MAX_PUT_REG; --count)
622                         regs[pos++] = *k++;
623                 for (; count > 0 && pos < PT_TRAP; --count, ++pos)
624                         ++k;
625         } else {
626                 for (; count > 0 && pos <= PT_MAX_PUT_REG; --count) {
627                         if (__get_user(reg, u++))
628                                 return -EFAULT;
629                         regs[pos++] = reg;
630                 }
631                 for (; count > 0 && pos < PT_TRAP; --count, ++pos)
632                         if (__get_user(reg, u++))
633                                 return -EFAULT;
634         }
635
636         if (count > 0 && pos == PT_TRAP) {
637                 if (kbuf)
638                         reg = *k++;
639                 else if (__get_user(reg, u++))
640                         return -EFAULT;
641                 set_user_trap(target, reg);
642                 ++pos;
643                 --count;
644         }
645
646         kbuf = k;
647         ubuf = u;
648         pos *= sizeof(reg);
649         count *= sizeof(reg);
650         return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
651                                          (PT_TRAP + 1) * sizeof(reg), -1);
652 }
653
654 /*
655  * These are the regset flavors matching the CONFIG_PPC32 native set.
656  */
657 static const struct user_regset compat_regsets[] = {
658         [REGSET_GPR] = {
659                 .core_note_type = NT_PRSTATUS, .n = ELF_NGREG,
660                 .size = sizeof(compat_long_t), .align = sizeof(compat_long_t),
661                 .get = gpr32_get, .set = gpr32_set
662         },
663         [REGSET_FPR] = {
664                 .core_note_type = NT_PRFPREG, .n = ELF_NFPREG,
665                 .size = sizeof(double), .align = sizeof(double),
666                 .get = fpr_get, .set = fpr_set
667         },
668 #ifdef CONFIG_ALTIVEC
669         [REGSET_VMX] = {
670                 .core_note_type = NT_PPC_VMX, .n = 34,
671                 .size = sizeof(vector128), .align = sizeof(vector128),
672                 .active = vr_active, .get = vr_get, .set = vr_set
673         },
674 #endif
675 #ifdef CONFIG_SPE
676         [REGSET_SPE] = {
677                 .core_note_type = NT_PPC_SPE, .n = 35,
678                 .size = sizeof(u32), .align = sizeof(u32),
679                 .active = evr_active, .get = evr_get, .set = evr_set
680         },
681 #endif
682 };
683
684 static const struct user_regset_view user_ppc_compat_view = {
685         .name = "ppc", .e_machine = EM_PPC, .ei_osabi = ELF_OSABI,
686         .regsets = compat_regsets, .n = ARRAY_SIZE(compat_regsets)
687 };
688 #endif  /* CONFIG_PPC64 */
689
690 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
691 {
692 #ifdef CONFIG_PPC64
693         if (test_tsk_thread_flag(task, TIF_32BIT))
694                 return &user_ppc_compat_view;
695 #endif
696         return &user_ppc_native_view;
697 }
698
699
700 void user_enable_single_step(struct task_struct *task)
701 {
702         struct pt_regs *regs = task->thread.regs;
703
704         if (regs != NULL) {
705 #if defined(CONFIG_40x) || defined(CONFIG_BOOKE)
706                 task->thread.dbcr0 = DBCR0_IDM | DBCR0_IC;
707                 regs->msr |= MSR_DE;
708 #else
709                 regs->msr |= MSR_SE;
710 #endif
711         }
712         set_tsk_thread_flag(task, TIF_SINGLESTEP);
713 }
714
715 void user_disable_single_step(struct task_struct *task)
716 {
717         struct pt_regs *regs = task->thread.regs;
718
719         if (regs != NULL) {
720 #if defined(CONFIG_40x) || defined(CONFIG_BOOKE)
721                 task->thread.dbcr0 = 0;
722                 regs->msr &= ~MSR_DE;
723 #else
724                 regs->msr &= ~MSR_SE;
725 #endif
726         }
727         clear_tsk_thread_flag(task, TIF_SINGLESTEP);
728 }
729
730 static int ptrace_set_debugreg(struct task_struct *task, unsigned long addr,
731                                unsigned long data)
732 {
733         /* We only support one DABR and no IABRS at the moment */
734         if (addr > 0)
735                 return -EINVAL;
736
737         /* The bottom 3 bits are flags */
738         if ((data & ~0x7UL) >= TASK_SIZE)
739                 return -EIO;
740
741         /* Ensure translation is on */
742         if (data && !(data & DABR_TRANSLATION))
743                 return -EIO;
744
745         task->thread.dabr = data;
746         return 0;
747 }
748
749 /*
750  * Called by kernel/ptrace.c when detaching..
751  *
752  * Make sure single step bits etc are not set.
753  */
754 void ptrace_disable(struct task_struct *child)
755 {
756         /* make sure the single step bit is not set. */
757         user_disable_single_step(child);
758 }
759
760 /*
761  * Here are the old "legacy" powerpc specific getregs/setregs ptrace calls,
762  * we mark them as obsolete now, they will be removed in a future version
763  */
764 static long arch_ptrace_old(struct task_struct *child, long request, long addr,
765                             long data)
766 {
767         switch (request) {
768         case PPC_PTRACE_GETREGS:        /* Get GPRs 0 - 31. */
769                 return copy_regset_to_user(child, &user_ppc_native_view,
770                                            REGSET_GPR, 0, 32 * sizeof(long),
771                                            (void __user *) data);
772
773         case PPC_PTRACE_SETREGS:        /* Set GPRs 0 - 31. */
774                 return copy_regset_from_user(child, &user_ppc_native_view,
775                                              REGSET_GPR, 0, 32 * sizeof(long),
776                                              (const void __user *) data);
777
778         case PPC_PTRACE_GETFPREGS:      /* Get FPRs 0 - 31. */
779                 return copy_regset_to_user(child, &user_ppc_native_view,
780                                            REGSET_FPR, 0, 32 * sizeof(double),
781                                            (void __user *) data);
782
783         case PPC_PTRACE_SETFPREGS:      /* Set FPRs 0 - 31. */
784                 return copy_regset_from_user(child, &user_ppc_native_view,
785                                              REGSET_FPR, 0, 32 * sizeof(double),
786                                              (const void __user *) data);
787         }
788
789         return -EPERM;
790 }
791
792 long arch_ptrace(struct task_struct *child, long request, long addr, long data)
793 {
794         int ret = -EPERM;
795
796         switch (request) {
797         /* read the word at location addr in the USER area. */
798         case PTRACE_PEEKUSR: {
799                 unsigned long index, tmp;
800
801                 ret = -EIO;
802                 /* convert to index and check */
803 #ifdef CONFIG_PPC32
804                 index = (unsigned long) addr >> 2;
805                 if ((addr & 3) || (index > PT_FPSCR)
806                     || (child->thread.regs == NULL))
807 #else
808                 index = (unsigned long) addr >> 3;
809                 if ((addr & 7) || (index > PT_FPSCR))
810 #endif
811                         break;
812
813                 CHECK_FULL_REGS(child->thread.regs);
814                 if (index < PT_FPR0) {
815                         tmp = ptrace_get_reg(child, (int) index);
816                 } else {
817                         flush_fp_to_thread(child);
818                         tmp = ((unsigned long *)child->thread.fpr)
819                                 [TS_FPRWIDTH * (index - PT_FPR0)];
820                 }
821                 ret = put_user(tmp,(unsigned long __user *) data);
822                 break;
823         }
824
825         /* write the word at location addr in the USER area */
826         case PTRACE_POKEUSR: {
827                 unsigned long index;
828
829                 ret = -EIO;
830                 /* convert to index and check */
831 #ifdef CONFIG_PPC32
832                 index = (unsigned long) addr >> 2;
833                 if ((addr & 3) || (index > PT_FPSCR)
834                     || (child->thread.regs == NULL))
835 #else
836                 index = (unsigned long) addr >> 3;
837                 if ((addr & 7) || (index > PT_FPSCR))
838 #endif
839                         break;
840
841                 CHECK_FULL_REGS(child->thread.regs);
842                 if (index < PT_FPR0) {
843                         ret = ptrace_put_reg(child, index, data);
844                 } else {
845                         flush_fp_to_thread(child);
846                         ((unsigned long *)child->thread.fpr)
847                                 [TS_FPRWIDTH * (index - PT_FPR0)] = data;
848                         ret = 0;
849                 }
850                 break;
851         }
852
853         case PTRACE_GET_DEBUGREG: {
854                 ret = -EINVAL;
855                 /* We only support one DABR and no IABRS at the moment */
856                 if (addr > 0)
857                         break;
858                 ret = put_user(child->thread.dabr,
859                                (unsigned long __user *)data);
860                 break;
861         }
862
863         case PTRACE_SET_DEBUGREG:
864                 ret = ptrace_set_debugreg(child, addr, data);
865                 break;
866
867 #ifdef CONFIG_PPC64
868         case PTRACE_GETREGS64:
869 #endif
870         case PTRACE_GETREGS:    /* Get all pt_regs from the child. */
871                 return copy_regset_to_user(child, &user_ppc_native_view,
872                                            REGSET_GPR,
873                                            0, sizeof(struct pt_regs),
874                                            (void __user *) data);
875
876 #ifdef CONFIG_PPC64
877         case PTRACE_SETREGS64:
878 #endif
879         case PTRACE_SETREGS:    /* Set all gp regs in the child. */
880                 return copy_regset_from_user(child, &user_ppc_native_view,
881                                              REGSET_GPR,
882                                              0, sizeof(struct pt_regs),
883                                              (const void __user *) data);
884
885         case PTRACE_GETFPREGS: /* Get the child FPU state (FPR0...31 + FPSCR) */
886                 return copy_regset_to_user(child, &user_ppc_native_view,
887                                            REGSET_FPR,
888                                            0, sizeof(elf_fpregset_t),
889                                            (void __user *) data);
890
891         case PTRACE_SETFPREGS: /* Set the child FPU state (FPR0...31 + FPSCR) */
892                 return copy_regset_from_user(child, &user_ppc_native_view,
893                                              REGSET_FPR,
894                                              0, sizeof(elf_fpregset_t),
895                                              (const void __user *) data);
896
897 #ifdef CONFIG_ALTIVEC
898         case PTRACE_GETVRREGS:
899                 return copy_regset_to_user(child, &user_ppc_native_view,
900                                            REGSET_VMX,
901                                            0, (33 * sizeof(vector128) +
902                                                sizeof(u32)),
903                                            (void __user *) data);
904
905         case PTRACE_SETVRREGS:
906                 return copy_regset_from_user(child, &user_ppc_native_view,
907                                              REGSET_VMX,
908                                              0, (33 * sizeof(vector128) +
909                                                  sizeof(u32)),
910                                              (const void __user *) data);
911 #endif
912 #ifdef CONFIG_VSX
913         case PTRACE_GETVSRREGS:
914                 return copy_regset_to_user(child, &user_ppc_native_view,
915                                            REGSET_VSX,
916                                            0, (32 * sizeof(vector128) +
917                                                sizeof(u32)),
918                                            (void __user *) data);
919
920         case PTRACE_SETVSRREGS:
921                 return copy_regset_from_user(child, &user_ppc_native_view,
922                                              REGSET_VSX,
923                                              0, (32 * sizeof(vector128) +
924                                                  sizeof(u32)),
925                                              (const void __user *) data);
926 #endif
927 #ifdef CONFIG_SPE
928         case PTRACE_GETEVRREGS:
929                 /* Get the child spe register state. */
930                 return copy_regset_to_user(child, &user_ppc_native_view,
931                                            REGSET_SPE, 0, 35 * sizeof(u32),
932                                            (void __user *) data);
933
934         case PTRACE_SETEVRREGS:
935                 /* Set the child spe register state. */
936                 return copy_regset_from_user(child, &user_ppc_native_view,
937                                              REGSET_SPE, 0, 35 * sizeof(u32),
938                                              (const void __user *) data);
939 #endif
940
941         /* Old reverse args ptrace callss */
942         case PPC_PTRACE_GETREGS: /* Get GPRs 0 - 31. */
943         case PPC_PTRACE_SETREGS: /* Set GPRs 0 - 31. */
944         case PPC_PTRACE_GETFPREGS: /* Get FPRs 0 - 31. */
945         case PPC_PTRACE_SETFPREGS: /* Get FPRs 0 - 31. */
946                 ret = arch_ptrace_old(child, request, addr, data);
947                 break;
948
949         default:
950                 ret = ptrace_request(child, request, addr, data);
951                 break;
952         }
953         return ret;
954 }
955
956 static void do_syscall_trace(void)
957 {
958         /* the 0x80 provides a way for the tracing parent to distinguish
959            between a syscall stop and SIGTRAP delivery */
960         ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
961                                  ? 0x80 : 0));
962
963         /*
964          * this isn't the same as continuing with a signal, but it will do
965          * for normal use.  strace only continues with a signal if the
966          * stopping signal is not SIGTRAP.  -brl
967          */
968         if (current->exit_code) {
969                 send_sig(current->exit_code, current, 1);
970                 current->exit_code = 0;
971         }
972 }
973
974 void do_syscall_trace_enter(struct pt_regs *regs)
975 {
976         secure_computing(regs->gpr[0]);
977
978         if (test_thread_flag(TIF_SYSCALL_TRACE)
979             && (current->ptrace & PT_PTRACED))
980                 do_syscall_trace();
981
982         if (unlikely(current->audit_context)) {
983 #ifdef CONFIG_PPC64
984                 if (!test_thread_flag(TIF_32BIT))
985                         audit_syscall_entry(AUDIT_ARCH_PPC64,
986                                             regs->gpr[0],
987                                             regs->gpr[3], regs->gpr[4],
988                                             regs->gpr[5], regs->gpr[6]);
989                 else
990 #endif
991                         audit_syscall_entry(AUDIT_ARCH_PPC,
992                                             regs->gpr[0],
993                                             regs->gpr[3] & 0xffffffff,
994                                             regs->gpr[4] & 0xffffffff,
995                                             regs->gpr[5] & 0xffffffff,
996                                             regs->gpr[6] & 0xffffffff);
997         }
998 }
999
1000 void do_syscall_trace_leave(struct pt_regs *regs)
1001 {
1002         if (unlikely(current->audit_context))
1003                 audit_syscall_exit((regs->ccr&0x10000000)?AUDITSC_FAILURE:AUDITSC_SUCCESS,
1004                                    regs->result);
1005
1006         if ((test_thread_flag(TIF_SYSCALL_TRACE)
1007              || test_thread_flag(TIF_SINGLESTEP))
1008             && (current->ptrace & PT_PTRACED))
1009                 do_syscall_trace();
1010 }