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13#include <linux/kernel.h>
14#include <linux/sched.h>
15#include <linux/mm.h>
16#include <linux/smp.h>
17#include <linux/errno.h>
18#include <linux/ptrace.h>
19#include <linux/user.h>
20#include <linux/security.h>
21#include <linux/signal.h>
22#include <linux/io.h>
23#include <linux/audit.h>
24#include <linux/seccomp.h>
25#include <linux/tracehook.h>
26#include <linux/elf.h>
27#include <linux/regset.h>
28#include <linux/hw_breakpoint.h>
29#include <asm/uaccess.h>
30#include <asm/pgtable.h>
31#include <asm/processor.h>
32#include <asm/mmu_context.h>
33#include <asm/syscalls.h>
34#include <asm/fpu.h>
35
36#define CREATE_TRACE_POINTS
37#include <trace/events/syscalls.h>
38
39
40
41
42static inline int get_stack_long(struct task_struct *task, int offset)
43{
44 unsigned char *stack;
45
46 stack = (unsigned char *)task_pt_regs(task);
47 stack += offset;
48 return (*((int *)stack));
49}
50
51
52
53
54static inline int put_stack_long(struct task_struct *task, int offset,
55 unsigned long data)
56{
57 unsigned char *stack;
58
59 stack = (unsigned char *)task_pt_regs(task);
60 stack += offset;
61 *(unsigned long *) stack = data;
62 return 0;
63}
64
65void ptrace_triggered(struct perf_event *bp,
66 struct perf_sample_data *data, struct pt_regs *regs)
67{
68 struct perf_event_attr attr;
69
70
71
72
73
74 attr = bp->attr;
75 attr.disabled = true;
76 modify_user_hw_breakpoint(bp, &attr);
77}
78
79static int set_single_step(struct task_struct *tsk, unsigned long addr)
80{
81 struct thread_struct *thread = &tsk->thread;
82 struct perf_event *bp;
83 struct perf_event_attr attr;
84
85 bp = thread->ptrace_bps[0];
86 if (!bp) {
87 ptrace_breakpoint_init(&attr);
88
89 attr.bp_addr = addr;
90 attr.bp_len = HW_BREAKPOINT_LEN_2;
91 attr.bp_type = HW_BREAKPOINT_R;
92
93 bp = register_user_hw_breakpoint(&attr, ptrace_triggered,
94 NULL, tsk);
95 if (IS_ERR(bp))
96 return PTR_ERR(bp);
97
98 thread->ptrace_bps[0] = bp;
99 } else {
100 int err;
101
102 attr = bp->attr;
103 attr.bp_addr = addr;
104
105 attr.disabled = false;
106 err = modify_user_hw_breakpoint(bp, &attr);
107 if (unlikely(err))
108 return err;
109 }
110
111 return 0;
112}
113
114void user_enable_single_step(struct task_struct *child)
115{
116 unsigned long pc = get_stack_long(child, offsetof(struct pt_regs, pc));
117
118 set_tsk_thread_flag(child, TIF_SINGLESTEP);
119
120 set_single_step(child, pc);
121}
122
123void user_disable_single_step(struct task_struct *child)
124{
125 clear_tsk_thread_flag(child, TIF_SINGLESTEP);
126}
127
128
129
130
131
132
133void ptrace_disable(struct task_struct *child)
134{
135 user_disable_single_step(child);
136}
137
138static int genregs_get(struct task_struct *target,
139 const struct user_regset *regset,
140 unsigned int pos, unsigned int count,
141 void *kbuf, void __user *ubuf)
142{
143 const struct pt_regs *regs = task_pt_regs(target);
144 int ret;
145
146 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
147 regs->regs,
148 0, 16 * sizeof(unsigned long));
149 if (!ret)
150
151 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
152 ®s->pc,
153 offsetof(struct pt_regs, pc),
154 sizeof(struct pt_regs));
155 if (!ret)
156 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
157 sizeof(struct pt_regs), -1);
158
159 return ret;
160}
161
162static int genregs_set(struct task_struct *target,
163 const struct user_regset *regset,
164 unsigned int pos, unsigned int count,
165 const void *kbuf, const void __user *ubuf)
166{
167 struct pt_regs *regs = task_pt_regs(target);
168 int ret;
169
170 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
171 regs->regs,
172 0, 16 * sizeof(unsigned long));
173 if (!ret && count > 0)
174 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
175 ®s->pc,
176 offsetof(struct pt_regs, pc),
177 sizeof(struct pt_regs));
178 if (!ret)
179 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
180 sizeof(struct pt_regs), -1);
181
182 return ret;
183}
184
185#ifdef CONFIG_SH_FPU
186int fpregs_get(struct task_struct *target,
187 const struct user_regset *regset,
188 unsigned int pos, unsigned int count,
189 void *kbuf, void __user *ubuf)
190{
191 int ret;
192
193 ret = init_fpu(target);
194 if (ret)
195 return ret;
196
197 if ((boot_cpu_data.flags & CPU_HAS_FPU))
198 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
199 &target->thread.xstate->hardfpu, 0, -1);
200
201 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
202 &target->thread.xstate->softfpu, 0, -1);
203}
204
205static int fpregs_set(struct task_struct *target,
206 const struct user_regset *regset,
207 unsigned int pos, unsigned int count,
208 const void *kbuf, const void __user *ubuf)
209{
210 int ret;
211
212 ret = init_fpu(target);
213 if (ret)
214 return ret;
215
216 set_stopped_child_used_math(target);
217
218 if ((boot_cpu_data.flags & CPU_HAS_FPU))
219 return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
220 &target->thread.xstate->hardfpu, 0, -1);
221
222 return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
223 &target->thread.xstate->softfpu, 0, -1);
224}
225
226static int fpregs_active(struct task_struct *target,
227 const struct user_regset *regset)
228{
229 return tsk_used_math(target) ? regset->n : 0;
230}
231#endif
232
233#ifdef CONFIG_SH_DSP
234static int dspregs_get(struct task_struct *target,
235 const struct user_regset *regset,
236 unsigned int pos, unsigned int count,
237 void *kbuf, void __user *ubuf)
238{
239 const struct pt_dspregs *regs =
240 (struct pt_dspregs *)&target->thread.dsp_status.dsp_regs;
241 int ret;
242
243 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, regs,
244 0, sizeof(struct pt_dspregs));
245 if (!ret)
246 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
247 sizeof(struct pt_dspregs), -1);
248
249 return ret;
250}
251
252static int dspregs_set(struct task_struct *target,
253 const struct user_regset *regset,
254 unsigned int pos, unsigned int count,
255 const void *kbuf, const void __user *ubuf)
256{
257 struct pt_dspregs *regs =
258 (struct pt_dspregs *)&target->thread.dsp_status.dsp_regs;
259 int ret;
260
261 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, regs,
262 0, sizeof(struct pt_dspregs));
263 if (!ret)
264 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
265 sizeof(struct pt_dspregs), -1);
266
267 return ret;
268}
269
270static int dspregs_active(struct task_struct *target,
271 const struct user_regset *regset)
272{
273 struct pt_regs *regs = task_pt_regs(target);
274
275 return regs->sr & SR_DSP ? regset->n : 0;
276}
277#endif
278
279const struct pt_regs_offset regoffset_table[] = {
280 REGS_OFFSET_NAME(0),
281 REGS_OFFSET_NAME(1),
282 REGS_OFFSET_NAME(2),
283 REGS_OFFSET_NAME(3),
284 REGS_OFFSET_NAME(4),
285 REGS_OFFSET_NAME(5),
286 REGS_OFFSET_NAME(6),
287 REGS_OFFSET_NAME(7),
288 REGS_OFFSET_NAME(8),
289 REGS_OFFSET_NAME(9),
290 REGS_OFFSET_NAME(10),
291 REGS_OFFSET_NAME(11),
292 REGS_OFFSET_NAME(12),
293 REGS_OFFSET_NAME(13),
294 REGS_OFFSET_NAME(14),
295 REGS_OFFSET_NAME(15),
296 REG_OFFSET_NAME(pc),
297 REG_OFFSET_NAME(pr),
298 REG_OFFSET_NAME(sr),
299 REG_OFFSET_NAME(gbr),
300 REG_OFFSET_NAME(mach),
301 REG_OFFSET_NAME(macl),
302 REG_OFFSET_NAME(tra),
303 REG_OFFSET_END,
304};
305
306
307
308
309enum sh_regset {
310 REGSET_GENERAL,
311#ifdef CONFIG_SH_FPU
312 REGSET_FPU,
313#endif
314#ifdef CONFIG_SH_DSP
315 REGSET_DSP,
316#endif
317};
318
319static const struct user_regset sh_regsets[] = {
320
321
322
323
324
325 [REGSET_GENERAL] = {
326 .core_note_type = NT_PRSTATUS,
327 .n = ELF_NGREG,
328 .size = sizeof(long),
329 .align = sizeof(long),
330 .get = genregs_get,
331 .set = genregs_set,
332 },
333
334#ifdef CONFIG_SH_FPU
335 [REGSET_FPU] = {
336 .core_note_type = NT_PRFPREG,
337 .n = sizeof(struct user_fpu_struct) / sizeof(long),
338 .size = sizeof(long),
339 .align = sizeof(long),
340 .get = fpregs_get,
341 .set = fpregs_set,
342 .active = fpregs_active,
343 },
344#endif
345
346#ifdef CONFIG_SH_DSP
347 [REGSET_DSP] = {
348 .n = sizeof(struct pt_dspregs) / sizeof(long),
349 .size = sizeof(long),
350 .align = sizeof(long),
351 .get = dspregs_get,
352 .set = dspregs_set,
353 .active = dspregs_active,
354 },
355#endif
356};
357
358static const struct user_regset_view user_sh_native_view = {
359 .name = "sh",
360 .e_machine = EM_SH,
361 .regsets = sh_regsets,
362 .n = ARRAY_SIZE(sh_regsets),
363};
364
365const struct user_regset_view *task_user_regset_view(struct task_struct *task)
366{
367 return &user_sh_native_view;
368}
369
370long arch_ptrace(struct task_struct *child, long request,
371 unsigned long addr, unsigned long data)
372{
373 unsigned long __user *datap = (unsigned long __user *)data;
374 int ret;
375
376 switch (request) {
377
378 case PTRACE_PEEKUSR: {
379 unsigned long tmp;
380
381 ret = -EIO;
382 if ((addr & 3) || addr < 0 ||
383 addr > sizeof(struct user) - 3)
384 break;
385
386 if (addr < sizeof(struct pt_regs))
387 tmp = get_stack_long(child, addr);
388 else if (addr >= offsetof(struct user, fpu) &&
389 addr < offsetof(struct user, u_fpvalid)) {
390 if (!tsk_used_math(child)) {
391 if (addr == offsetof(struct user, fpu.fpscr))
392 tmp = FPSCR_INIT;
393 else
394 tmp = 0;
395 } else {
396 unsigned long index;
397 ret = init_fpu(child);
398 if (ret)
399 break;
400 index = addr - offsetof(struct user, fpu);
401 tmp = ((unsigned long *)child->thread.xstate)
402 [index >> 2];
403 }
404 } else if (addr == offsetof(struct user, u_fpvalid))
405 tmp = !!tsk_used_math(child);
406 else if (addr == PT_TEXT_ADDR)
407 tmp = child->mm->start_code;
408 else if (addr == PT_DATA_ADDR)
409 tmp = child->mm->start_data;
410 else if (addr == PT_TEXT_END_ADDR)
411 tmp = child->mm->end_code;
412 else if (addr == PT_TEXT_LEN)
413 tmp = child->mm->end_code - child->mm->start_code;
414 else
415 tmp = 0;
416 ret = put_user(tmp, datap);
417 break;
418 }
419
420 case PTRACE_POKEUSR:
421 ret = -EIO;
422 if ((addr & 3) || addr < 0 ||
423 addr > sizeof(struct user) - 3)
424 break;
425
426 if (addr < sizeof(struct pt_regs))
427 ret = put_stack_long(child, addr, data);
428 else if (addr >= offsetof(struct user, fpu) &&
429 addr < offsetof(struct user, u_fpvalid)) {
430 unsigned long index;
431 ret = init_fpu(child);
432 if (ret)
433 break;
434 index = addr - offsetof(struct user, fpu);
435 set_stopped_child_used_math(child);
436 ((unsigned long *)child->thread.xstate)
437 [index >> 2] = data;
438 ret = 0;
439 } else if (addr == offsetof(struct user, u_fpvalid)) {
440 conditional_stopped_child_used_math(data, child);
441 ret = 0;
442 }
443 break;
444
445 case PTRACE_GETREGS:
446 return copy_regset_to_user(child, &user_sh_native_view,
447 REGSET_GENERAL,
448 0, sizeof(struct pt_regs),
449 datap);
450 case PTRACE_SETREGS:
451 return copy_regset_from_user(child, &user_sh_native_view,
452 REGSET_GENERAL,
453 0, sizeof(struct pt_regs),
454 datap);
455#ifdef CONFIG_SH_FPU
456 case PTRACE_GETFPREGS:
457 return copy_regset_to_user(child, &user_sh_native_view,
458 REGSET_FPU,
459 0, sizeof(struct user_fpu_struct),
460 datap);
461 case PTRACE_SETFPREGS:
462 return copy_regset_from_user(child, &user_sh_native_view,
463 REGSET_FPU,
464 0, sizeof(struct user_fpu_struct),
465 datap);
466#endif
467#ifdef CONFIG_SH_DSP
468 case PTRACE_GETDSPREGS:
469 return copy_regset_to_user(child, &user_sh_native_view,
470 REGSET_DSP,
471 0, sizeof(struct pt_dspregs),
472 datap);
473 case PTRACE_SETDSPREGS:
474 return copy_regset_from_user(child, &user_sh_native_view,
475 REGSET_DSP,
476 0, sizeof(struct pt_dspregs),
477 datap);
478#endif
479 default:
480 ret = ptrace_request(child, request, addr, data);
481 break;
482 }
483
484 return ret;
485}
486
487static inline int audit_arch(void)
488{
489 int arch = EM_SH;
490
491#ifdef CONFIG_CPU_LITTLE_ENDIAN
492 arch |= __AUDIT_ARCH_LE;
493#endif
494
495 return arch;
496}
497
498asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
499{
500 long ret = 0;
501
502 secure_computing_strict(regs->regs[0]);
503
504 if (test_thread_flag(TIF_SYSCALL_TRACE) &&
505 tracehook_report_syscall_entry(regs))
506
507
508
509
510
511 ret = -1L;
512
513 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
514 trace_sys_enter(regs, regs->regs[0]);
515
516 audit_syscall_entry(audit_arch(), regs->regs[3],
517 regs->regs[4], regs->regs[5],
518 regs->regs[6], regs->regs[7]);
519
520 return ret ?: regs->regs[0];
521}
522
523asmlinkage void do_syscall_trace_leave(struct pt_regs *regs)
524{
525 int step;
526
527 audit_syscall_exit(regs);
528
529 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
530 trace_sys_exit(regs, regs->regs[0]);
531
532 step = test_thread_flag(TIF_SINGLESTEP);
533 if (step || test_thread_flag(TIF_SYSCALL_TRACE))
534 tracehook_report_syscall_exit(regs, step);
535}
536
