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