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Linux/arch/sh/kernel/ptrace_64.c

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  1 /*
  2  * arch/sh/kernel/ptrace_64.c
  3  *
  4  * Copyright (C) 2000, 2001  Paolo Alberelli
  5  * Copyright (C) 2003 - 2008  Paul Mundt
  6  *
  7  * Started from SH3/4 version:
  8  *   SuperH version:   Copyright (C) 1999, 2000  Kaz Kojima & Niibe Yutaka
  9  *
 10  *   Original x86 implementation:
 11  *      By Ross Biro 1/23/92
 12  *      edited by Linus Torvalds
 13  *
 14  * This file is subject to the terms and conditions of the GNU General Public
 15  * License.  See the file "COPYING" in the main directory of this archive
 16  * for more details.
 17  */
 18 #include <linux/kernel.h>
 19 #include <linux/rwsem.h>
 20 #include <linux/sched.h>
 21 #include <linux/mm.h>
 22 #include <linux/smp.h>
 23 #include <linux/bitops.h>
 24 #include <linux/errno.h>
 25 #include <linux/ptrace.h>
 26 #include <linux/user.h>
 27 #include <linux/signal.h>
 28 #include <linux/syscalls.h>
 29 #include <linux/audit.h>
 30 #include <linux/seccomp.h>
 31 #include <linux/tracehook.h>
 32 #include <linux/elf.h>
 33 #include <linux/regset.h>
 34 #include <asm/io.h>
 35 #include <asm/uaccess.h>
 36 #include <asm/pgtable.h>
 37 #include <asm/processor.h>
 38 #include <asm/mmu_context.h>
 39 #include <asm/syscalls.h>
 40 #include <asm/fpu.h>
 41 #include <asm/traps.h>
 42 
 43 #define CREATE_TRACE_POINTS
 44 #include <trace/events/syscalls.h>
 45 
 46 /* This mask defines the bits of the SR which the user is not allowed to
 47    change, which are everything except S, Q, M, PR, SZ, FR. */
 48 #define SR_MASK      (0xffff8cfd)
 49 
 50 /*
 51  * does not yet catch signals sent when the child dies.
 52  * in exit.c or in signal.c.
 53  */
 54 
 55 /*
 56  * This routine will get a word from the user area in the process kernel stack.
 57  */
 58 static inline int get_stack_long(struct task_struct *task, int offset)
 59 {
 60         unsigned char *stack;
 61 
 62         stack = (unsigned char *)(task->thread.uregs);
 63         stack += offset;
 64         return (*((int *)stack));
 65 }
 66 
 67 static inline unsigned long
 68 get_fpu_long(struct task_struct *task, unsigned long addr)
 69 {
 70         unsigned long tmp;
 71         struct pt_regs *regs;
 72         regs = (struct pt_regs*)((unsigned char *)task + THREAD_SIZE) - 1;
 73 
 74         if (!tsk_used_math(task)) {
 75                 if (addr == offsetof(struct user_fpu_struct, fpscr)) {
 76                         tmp = FPSCR_INIT;
 77                 } else {
 78                         tmp = 0xffffffffUL; /* matches initial value in fpu.c */
 79                 }
 80                 return tmp;
 81         }
 82 
 83         if (last_task_used_math == task) {
 84                 enable_fpu();
 85                 save_fpu(task);
 86                 disable_fpu();
 87                 last_task_used_math = 0;
 88                 regs->sr |= SR_FD;
 89         }
 90 
 91         tmp = ((long *)task->thread.xstate)[addr / sizeof(unsigned long)];
 92         return tmp;
 93 }
 94 
 95 /*
 96  * This routine will put a word into the user area in the process kernel stack.
 97  */
 98 static inline int put_stack_long(struct task_struct *task, int offset,
 99                                  unsigned long data)
100 {
101         unsigned char *stack;
102 
103         stack = (unsigned char *)(task->thread.uregs);
104         stack += offset;
105         *(unsigned long *) stack = data;
106         return 0;
107 }
108 
109 static inline int
110 put_fpu_long(struct task_struct *task, unsigned long addr, unsigned long data)
111 {
112         struct pt_regs *regs;
113 
114         regs = (struct pt_regs*)((unsigned char *)task + THREAD_SIZE) - 1;
115 
116         if (!tsk_used_math(task)) {
117                 init_fpu(task);
118         } else if (last_task_used_math == task) {
119                 enable_fpu();
120                 save_fpu(task);
121                 disable_fpu();
122                 last_task_used_math = 0;
123                 regs->sr |= SR_FD;
124         }
125 
126         ((long *)task->thread.xstate)[addr / sizeof(unsigned long)] = data;
127         return 0;
128 }
129 
130 void user_enable_single_step(struct task_struct *child)
131 {
132         struct pt_regs *regs = child->thread.uregs;
133 
134         regs->sr |= SR_SSTEP;   /* auto-resetting upon exception */
135 
136         set_tsk_thread_flag(child, TIF_SINGLESTEP);
137 }
138 
139 void user_disable_single_step(struct task_struct *child)
140 {
141         struct pt_regs *regs = child->thread.uregs;
142 
143         regs->sr &= ~SR_SSTEP;
144 
145         clear_tsk_thread_flag(child, TIF_SINGLESTEP);
146 }
147 
148 static int genregs_get(struct task_struct *target,
149                        const struct user_regset *regset,
150                        unsigned int pos, unsigned int count,
151                        void *kbuf, void __user *ubuf)
152 {
153         const struct pt_regs *regs = task_pt_regs(target);
154         int ret;
155 
156         /* PC, SR, SYSCALL */
157         ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
158                                   &regs->pc,
159                                   0, 3 * sizeof(unsigned long long));
160 
161         /* R1 -> R63 */
162         if (!ret)
163                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
164                                           regs->regs,
165                                           offsetof(struct pt_regs, regs[0]),
166                                           63 * sizeof(unsigned long long));
167         /* TR0 -> TR7 */
168         if (!ret)
169                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
170                                           regs->tregs,
171                                           offsetof(struct pt_regs, tregs[0]),
172                                           8 * sizeof(unsigned long long));
173 
174         if (!ret)
175                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
176                                                sizeof(struct pt_regs), -1);
177 
178         return ret;
179 }
180 
181 static int genregs_set(struct task_struct *target,
182                        const struct user_regset *regset,
183                        unsigned int pos, unsigned int count,
184                        const void *kbuf, const void __user *ubuf)
185 {
186         struct pt_regs *regs = task_pt_regs(target);
187         int ret;
188 
189         /* PC, SR, SYSCALL */
190         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
191                                  &regs->pc,
192                                  0, 3 * sizeof(unsigned long long));
193 
194         /* R1 -> R63 */
195         if (!ret && count > 0)
196                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
197                                          regs->regs,
198                                          offsetof(struct pt_regs, regs[0]),
199                                          63 * sizeof(unsigned long long));
200 
201         /* TR0 -> TR7 */
202         if (!ret && count > 0)
203                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
204                                          regs->tregs,
205                                          offsetof(struct pt_regs, tregs[0]),
206                                          8 * sizeof(unsigned long long));
207 
208         if (!ret)
209                 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
210                                                 sizeof(struct pt_regs), -1);
211 
212         return ret;
213 }
214 
215 #ifdef CONFIG_SH_FPU
216 int fpregs_get(struct task_struct *target,
217                const struct user_regset *regset,
218                unsigned int pos, unsigned int count,
219                void *kbuf, void __user *ubuf)
220 {
221         int ret;
222 
223         ret = init_fpu(target);
224         if (ret)
225                 return ret;
226 
227         return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
228                                    &target->thread.xstate->hardfpu, 0, -1);
229 }
230 
231 static int fpregs_set(struct task_struct *target,
232                        const struct user_regset *regset,
233                        unsigned int pos, unsigned int count,
234                        const void *kbuf, const void __user *ubuf)
235 {
236         int ret;
237 
238         ret = init_fpu(target);
239         if (ret)
240                 return ret;
241 
242         set_stopped_child_used_math(target);
243 
244         return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
245                                   &target->thread.xstate->hardfpu, 0, -1);
246 }
247 
248 static int fpregs_active(struct task_struct *target,
249                          const struct user_regset *regset)
250 {
251         return tsk_used_math(target) ? regset->n : 0;
252 }
253 #endif
254 
255 const struct pt_regs_offset regoffset_table[] = {
256         REG_OFFSET_NAME(pc),
257         REG_OFFSET_NAME(sr),
258         REG_OFFSET_NAME(syscall_nr),
259         REGS_OFFSET_NAME(0),
260         REGS_OFFSET_NAME(1),
261         REGS_OFFSET_NAME(2),
262         REGS_OFFSET_NAME(3),
263         REGS_OFFSET_NAME(4),
264         REGS_OFFSET_NAME(5),
265         REGS_OFFSET_NAME(6),
266         REGS_OFFSET_NAME(7),
267         REGS_OFFSET_NAME(8),
268         REGS_OFFSET_NAME(9),
269         REGS_OFFSET_NAME(10),
270         REGS_OFFSET_NAME(11),
271         REGS_OFFSET_NAME(12),
272         REGS_OFFSET_NAME(13),
273         REGS_OFFSET_NAME(14),
274         REGS_OFFSET_NAME(15),
275         REGS_OFFSET_NAME(16),
276         REGS_OFFSET_NAME(17),
277         REGS_OFFSET_NAME(18),
278         REGS_OFFSET_NAME(19),
279         REGS_OFFSET_NAME(20),
280         REGS_OFFSET_NAME(21),
281         REGS_OFFSET_NAME(22),
282         REGS_OFFSET_NAME(23),
283         REGS_OFFSET_NAME(24),
284         REGS_OFFSET_NAME(25),
285         REGS_OFFSET_NAME(26),
286         REGS_OFFSET_NAME(27),
287         REGS_OFFSET_NAME(28),
288         REGS_OFFSET_NAME(29),
289         REGS_OFFSET_NAME(30),
290         REGS_OFFSET_NAME(31),
291         REGS_OFFSET_NAME(32),
292         REGS_OFFSET_NAME(33),
293         REGS_OFFSET_NAME(34),
294         REGS_OFFSET_NAME(35),
295         REGS_OFFSET_NAME(36),
296         REGS_OFFSET_NAME(37),
297         REGS_OFFSET_NAME(38),
298         REGS_OFFSET_NAME(39),
299         REGS_OFFSET_NAME(40),
300         REGS_OFFSET_NAME(41),
301         REGS_OFFSET_NAME(42),
302         REGS_OFFSET_NAME(43),
303         REGS_OFFSET_NAME(44),
304         REGS_OFFSET_NAME(45),
305         REGS_OFFSET_NAME(46),
306         REGS_OFFSET_NAME(47),
307         REGS_OFFSET_NAME(48),
308         REGS_OFFSET_NAME(49),
309         REGS_OFFSET_NAME(50),
310         REGS_OFFSET_NAME(51),
311         REGS_OFFSET_NAME(52),
312         REGS_OFFSET_NAME(53),
313         REGS_OFFSET_NAME(54),
314         REGS_OFFSET_NAME(55),
315         REGS_OFFSET_NAME(56),
316         REGS_OFFSET_NAME(57),
317         REGS_OFFSET_NAME(58),
318         REGS_OFFSET_NAME(59),
319         REGS_OFFSET_NAME(60),
320         REGS_OFFSET_NAME(61),
321         REGS_OFFSET_NAME(62),
322         REGS_OFFSET_NAME(63),
323         TREGS_OFFSET_NAME(0),
324         TREGS_OFFSET_NAME(1),
325         TREGS_OFFSET_NAME(2),
326         TREGS_OFFSET_NAME(3),
327         TREGS_OFFSET_NAME(4),
328         TREGS_OFFSET_NAME(5),
329         TREGS_OFFSET_NAME(6),
330         TREGS_OFFSET_NAME(7),
331         REG_OFFSET_END,
332 };
333 
334 /*
335  * These are our native regset flavours.
336  */
337 enum sh_regset {
338         REGSET_GENERAL,
339 #ifdef CONFIG_SH_FPU
340         REGSET_FPU,
341 #endif
342 };
343 
344 static const struct user_regset sh_regsets[] = {
345         /*
346          * Format is:
347          *      PC, SR, SYSCALL,
348          *      R1 --> R63,
349          *      TR0 --> TR7,
350          */
351         [REGSET_GENERAL] = {
352                 .core_note_type = NT_PRSTATUS,
353                 .n              = ELF_NGREG,
354                 .size           = sizeof(long long),
355                 .align          = sizeof(long long),
356                 .get            = genregs_get,
357                 .set            = genregs_set,
358         },
359 
360 #ifdef CONFIG_SH_FPU
361         [REGSET_FPU] = {
362                 .core_note_type = NT_PRFPREG,
363                 .n              = sizeof(struct user_fpu_struct) /
364                                   sizeof(long long),
365                 .size           = sizeof(long long),
366                 .align          = sizeof(long long),
367                 .get            = fpregs_get,
368                 .set            = fpregs_set,
369                 .active         = fpregs_active,
370         },
371 #endif
372 };
373 
374 static const struct user_regset_view user_sh64_native_view = {
375         .name           = "sh64",
376         .e_machine      = EM_SH,
377         .regsets        = sh_regsets,
378         .n              = ARRAY_SIZE(sh_regsets),
379 };
380 
381 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
382 {
383         return &user_sh64_native_view;
384 }
385 
386 long arch_ptrace(struct task_struct *child, long request,
387                  unsigned long addr, unsigned long data)
388 {
389         int ret;
390         unsigned long __user *datap = (unsigned long __user *) data;
391 
392         switch (request) {
393         /* read the word at location addr in the USER area. */
394         case PTRACE_PEEKUSR: {
395                 unsigned long tmp;
396 
397                 ret = -EIO;
398                 if ((addr & 3) || addr < 0)
399                         break;
400 
401                 if (addr < sizeof(struct pt_regs))
402                         tmp = get_stack_long(child, addr);
403                 else if ((addr >= offsetof(struct user, fpu)) &&
404                          (addr <  offsetof(struct user, u_fpvalid))) {
405                         unsigned long index;
406                         ret = init_fpu(child);
407                         if (ret)
408                                 break;
409                         index = addr - offsetof(struct user, fpu);
410                         tmp = get_fpu_long(child, index);
411                 } else if (addr == offsetof(struct user, u_fpvalid)) {
412                         tmp = !!tsk_used_math(child);
413                 } else {
414                         break;
415                 }
416                 ret = put_user(tmp, datap);
417                 break;
418         }
419 
420         case PTRACE_POKEUSR:
421                 /* write the word at location addr in the USER area. We must
422                    disallow any changes to certain SR bits or u_fpvalid, since
423                    this could crash the kernel or result in a security
424                    loophole. */
425                 ret = -EIO;
426                 if ((addr & 3) || addr < 0)
427                         break;
428 
429                 if (addr < sizeof(struct pt_regs)) {
430                         /* Ignore change of top 32 bits of SR */
431                         if (addr == offsetof (struct pt_regs, sr)+4)
432                         {
433                                 ret = 0;
434                                 break;
435                         }
436                         /* If lower 32 bits of SR, ignore non-user bits */
437                         if (addr == offsetof (struct pt_regs, sr))
438                         {
439                                 long cursr = get_stack_long(child, addr);
440                                 data &= ~(SR_MASK);
441                                 data |= (cursr & SR_MASK);
442                         }
443                         ret = put_stack_long(child, addr, data);
444                 }
445                 else if ((addr >= offsetof(struct user, fpu)) &&
446                          (addr <  offsetof(struct user, u_fpvalid))) {
447                         unsigned long index;
448                         ret = init_fpu(child);
449                         if (ret)
450                                 break;
451                         index = addr - offsetof(struct user, fpu);
452                         ret = put_fpu_long(child, index, data);
453                 }
454                 break;
455 
456         case PTRACE_GETREGS:
457                 return copy_regset_to_user(child, &user_sh64_native_view,
458                                            REGSET_GENERAL,
459                                            0, sizeof(struct pt_regs),
460                                            datap);
461         case PTRACE_SETREGS:
462                 return copy_regset_from_user(child, &user_sh64_native_view,
463                                              REGSET_GENERAL,
464                                              0, sizeof(struct pt_regs),
465                                              datap);
466 #ifdef CONFIG_SH_FPU
467         case PTRACE_GETFPREGS:
468                 return copy_regset_to_user(child, &user_sh64_native_view,
469                                            REGSET_FPU,
470                                            0, sizeof(struct user_fpu_struct),
471                                            datap);
472         case PTRACE_SETFPREGS:
473                 return copy_regset_from_user(child, &user_sh64_native_view,
474                                              REGSET_FPU,
475                                              0, sizeof(struct user_fpu_struct),
476                                              datap);
477 #endif
478         default:
479                 ret = ptrace_request(child, request, addr, data);
480                 break;
481         }
482 
483         return ret;
484 }
485 
486 asmlinkage int sh64_ptrace(long request, long pid,
487                            unsigned long addr, unsigned long data)
488 {
489 #define WPC_DBRMODE 0x0d104008
490         static unsigned long first_call;
491 
492         if (!test_and_set_bit(0, &first_call)) {
493                 /* Set WPC.DBRMODE to 0.  This makes all debug events get
494                  * delivered through RESVEC, i.e. into the handlers in entry.S.
495                  * (If the kernel was downloaded using a remote gdb, WPC.DBRMODE
496                  * would normally be left set to 1, which makes debug events get
497                  * delivered through DBRVEC, i.e. into the remote gdb's
498                  * handlers.  This prevents ptrace getting them, and confuses
499                  * the remote gdb.) */
500                 printk("DBRMODE set to 0 to permit native debugging\n");
501                 poke_real_address_q(WPC_DBRMODE, 0);
502         }
503 
504         return sys_ptrace(request, pid, addr, data);
505 }
506 
507 static inline int audit_arch(void)
508 {
509         int arch = EM_SH;
510 
511 #ifdef CONFIG_64BIT
512         arch |= __AUDIT_ARCH_64BIT;
513 #endif
514 #ifdef CONFIG_CPU_LITTLE_ENDIAN
515         arch |= __AUDIT_ARCH_LE;
516 #endif
517 
518         return arch;
519 }
520 
521 asmlinkage long long do_syscall_trace_enter(struct pt_regs *regs)
522 {
523         long long ret = 0;
524 
525         secure_computing_strict(regs->regs[9]);
526 
527         if (test_thread_flag(TIF_SYSCALL_TRACE) &&
528             tracehook_report_syscall_entry(regs))
529                 /*
530                  * Tracing decided this syscall should not happen.
531                  * We'll return a bogus call number to get an ENOSYS
532                  * error, but leave the original number in regs->regs[0].
533                  */
534                 ret = -1LL;
535 
536         if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
537                 trace_sys_enter(regs, regs->regs[9]);
538 
539         audit_syscall_entry(audit_arch(), regs->regs[1],
540                             regs->regs[2], regs->regs[3],
541                             regs->regs[4], regs->regs[5]);
542 
543         return ret ?: regs->regs[9];
544 }
545 
546 asmlinkage void do_syscall_trace_leave(struct pt_regs *regs)
547 {
548         int step;
549 
550         audit_syscall_exit(regs);
551 
552         if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
553                 trace_sys_exit(regs, regs->regs[9]);
554 
555         step = test_thread_flag(TIF_SINGLESTEP);
556         if (step || test_thread_flag(TIF_SYSCALL_TRACE))
557                 tracehook_report_syscall_exit(regs, step);
558 }
559 
560 /* Called with interrupts disabled */
561 asmlinkage void do_single_step(unsigned long long vec, struct pt_regs *regs)
562 {
563         /* This is called after a single step exception (DEBUGSS).
564            There is no need to change the PC, as it is a post-execution
565            exception, as entry.S does not do anything to the PC for DEBUGSS.
566            We need to clear the Single Step setting in SR to avoid
567            continually stepping. */
568         local_irq_enable();
569         regs->sr &= ~SR_SSTEP;
570         force_sig(SIGTRAP, current);
571 }
572 
573 /* Called with interrupts disabled */
574 BUILD_TRAP_HANDLER(breakpoint)
575 {
576         TRAP_HANDLER_DECL;
577 
578         /* We need to forward step the PC, to counteract the backstep done
579            in signal.c. */
580         local_irq_enable();
581         force_sig(SIGTRAP, current);
582         regs->pc += 4;
583 }
584 
585 /*
586  * Called by kernel/ptrace.c when detaching..
587  *
588  * Make sure single step bits etc are not set.
589  */
590 void ptrace_disable(struct task_struct *child)
591 {
592         user_disable_single_step(child);
593 }
594 

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