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