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

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