1
2
3
4
5
6
7
8
9
10
11
12
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 if (ptrace_get_breakpoints(child) < 0)
121 return;
122
123 set_single_step(child, pc);
124 ptrace_put_breakpoints(child);
125}
126
127void user_disable_single_step(struct task_struct *child)
128{
129 clear_tsk_thread_flag(child, TIF_SINGLESTEP);
130}
131
132
133
134
135
136
137void ptrace_disable(struct task_struct *child)
138{
139 user_disable_single_step(child);
140}
141
142static int genregs_get(struct task_struct *target,
143 const struct user_regset *regset,
144 unsigned int pos, unsigned int count,
145 void *kbuf, void __user *ubuf)
146{
147 const struct pt_regs *regs = task_pt_regs(target);
148 int ret;
149
150 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
151 regs->regs,
152 0, 16 * sizeof(unsigned long));
153 if (!ret)
154
155 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
156 ®s->pc,
157 offsetof(struct pt_regs, pc),
158 sizeof(struct pt_regs));
159 if (!ret)
160 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
161 sizeof(struct pt_regs), -1);
162
163 return ret;
164}
165
166static int genregs_set(struct task_struct *target,
167 const struct user_regset *regset,
168 unsigned int pos, unsigned int count,
169 const void *kbuf, const void __user *ubuf)
170{
171 struct pt_regs *regs = task_pt_regs(target);
172 int ret;
173
174 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
175 regs->regs,
176 0, 16 * sizeof(unsigned long));
177 if (!ret && count > 0)
178 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
179 ®s->pc,
180 offsetof(struct pt_regs, pc),
181 sizeof(struct pt_regs));
182 if (!ret)
183 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
184 sizeof(struct pt_regs), -1);
185
186 return ret;
187}
188
189#ifdef CONFIG_SH_FPU
190int fpregs_get(struct task_struct *target,
191 const struct user_regset *regset,
192 unsigned int pos, unsigned int count,
193 void *kbuf, void __user *ubuf)
194{
195 int ret;
196
197 ret = init_fpu(target);
198 if (ret)
199 return ret;
200
201 if ((boot_cpu_data.flags & CPU_HAS_FPU))
202 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
203 &target->thread.xstate->hardfpu, 0, -1);
204
205 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
206 &target->thread.xstate->softfpu, 0, -1);
207}
208
209static int fpregs_set(struct task_struct *target,
210 const struct user_regset *regset,
211 unsigned int pos, unsigned int count,
212 const void *kbuf, const void __user *ubuf)
213{
214 int ret;
215
216 ret = init_fpu(target);
217 if (ret)
218 return ret;
219
220 set_stopped_child_used_math(target);
221
222 if ((boot_cpu_data.flags & CPU_HAS_FPU))
223 return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
224 &target->thread.xstate->hardfpu, 0, -1);
225
226 return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
227 &target->thread.xstate->softfpu, 0, -1);
228}
229
230static int fpregs_active(struct task_struct *target,
231 const struct user_regset *regset)
232{
233 return tsk_used_math(target) ? regset->n : 0;
234}
235#endif
236
237#ifdef CONFIG_SH_DSP
238static int dspregs_get(struct task_struct *target,
239 const struct user_regset *regset,
240 unsigned int pos, unsigned int count,
241 void *kbuf, void __user *ubuf)
242{
243 const struct pt_dspregs *regs =
244 (struct pt_dspregs *)&target->thread.dsp_status.dsp_regs;
245 int ret;
246
247 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, regs,
248 0, sizeof(struct pt_dspregs));
249 if (!ret)
250 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
251 sizeof(struct pt_dspregs), -1);
252
253 return ret;
254}
255
256static int dspregs_set(struct task_struct *target,
257 const struct user_regset *regset,
258 unsigned int pos, unsigned int count,
259 const void *kbuf, const void __user *ubuf)
260{
261 struct pt_dspregs *regs =
262 (struct pt_dspregs *)&target->thread.dsp_status.dsp_regs;
263 int ret;
264
265 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, regs,
266 0, sizeof(struct pt_dspregs));
267 if (!ret)
268 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
269 sizeof(struct pt_dspregs), -1);
270
271 return ret;
272}
273
274static int dspregs_active(struct task_struct *target,
275 const struct user_regset *regset)
276{
277 struct pt_regs *regs = task_pt_regs(target);
278
279 return regs->sr & SR_DSP ? regset->n : 0;
280}
281#endif
282
283const struct pt_regs_offset regoffset_table[] = {
284 REGS_OFFSET_NAME(0),
285 REGS_OFFSET_NAME(1),
286 REGS_OFFSET_NAME(2),
287 REGS_OFFSET_NAME(3),
288 REGS_OFFSET_NAME(4),
289 REGS_OFFSET_NAME(5),
290 REGS_OFFSET_NAME(6),
291 REGS_OFFSET_NAME(7),
292 REGS_OFFSET_NAME(8),
293 REGS_OFFSET_NAME(9),
294 REGS_OFFSET_NAME(10),
295 REGS_OFFSET_NAME(11),
296 REGS_OFFSET_NAME(12),
297 REGS_OFFSET_NAME(13),
298 REGS_OFFSET_NAME(14),
299 REGS_OFFSET_NAME(15),
300 REG_OFFSET_NAME(pc),
301 REG_OFFSET_NAME(pr),
302 REG_OFFSET_NAME(sr),
303 REG_OFFSET_NAME(gbr),
304 REG_OFFSET_NAME(mach),
305 REG_OFFSET_NAME(macl),
306 REG_OFFSET_NAME(tra),
307 REG_OFFSET_END,
308};
309
310
311
312
313enum sh_regset {
314 REGSET_GENERAL,
315#ifdef CONFIG_SH_FPU
316 REGSET_FPU,
317#endif
318#ifdef CONFIG_SH_DSP
319 REGSET_DSP,
320#endif
321};
322
323static const struct user_regset sh_regsets[] = {
324
325
326
327
328
329 [REGSET_GENERAL] = {
330 .core_note_type = NT_PRSTATUS,
331 .n = ELF_NGREG,
332 .size = sizeof(long),
333 .align = sizeof(long),
334 .get = genregs_get,
335 .set = genregs_set,
336 },
337
338#ifdef CONFIG_SH_FPU
339 [REGSET_FPU] = {
340 .core_note_type = NT_PRFPREG,
341 .n = sizeof(struct user_fpu_struct) / sizeof(long),
342 .size = sizeof(long),
343 .align = sizeof(long),
344 .get = fpregs_get,
345 .set = fpregs_set,
346 .active = fpregs_active,
347 },
348#endif
349
350#ifdef CONFIG_SH_DSP
351 [REGSET_DSP] = {
352 .n = sizeof(struct pt_dspregs) / sizeof(long),
353 .size = sizeof(long),
354 .align = sizeof(long),
355 .get = dspregs_get,
356 .set = dspregs_set,
357 .active = dspregs_active,
358 },
359#endif
360};
361
362static const struct user_regset_view user_sh_native_view = {
363 .name = "sh",
364 .e_machine = EM_SH,
365 .regsets = sh_regsets,
366 .n = ARRAY_SIZE(sh_regsets),
367};
368
369const struct user_regset_view *task_user_regset_view(struct task_struct *task)
370{
371 return &user_sh_native_view;
372}
373
374long arch_ptrace(struct task_struct *child, long request,
375 unsigned long addr, unsigned long data)
376{
377 unsigned long __user *datap = (unsigned long __user *)data;
378 int ret;
379
380 switch (request) {
381
382 case PTRACE_PEEKUSR: {
383 unsigned long tmp;
384
385 ret = -EIO;
386 if ((addr & 3) || addr < 0 ||
387 addr > sizeof(struct user) - 3)
388 break;
389
390 if (addr < sizeof(struct pt_regs))
391 tmp = get_stack_long(child, addr);
392 else if (addr >= offsetof(struct user, fpu) &&
393 addr < offsetof(struct user, u_fpvalid)) {
394 if (!tsk_used_math(child)) {
395 if (addr == offsetof(struct user, fpu.fpscr))
396 tmp = FPSCR_INIT;
397 else
398 tmp = 0;
399 } else {
400 unsigned long index;
401 ret = init_fpu(child);
402 if (ret)
403 break;
404 index = addr - offsetof(struct user, fpu);
405 tmp = ((unsigned long *)child->thread.xstate)
406 [index >> 2];
407 }
408 } else if (addr == offsetof(struct user, u_fpvalid))
409 tmp = !!tsk_used_math(child);
410 else if (addr == PT_TEXT_ADDR)
411 tmp = child->mm->start_code;
412 else if (addr == PT_DATA_ADDR)
413 tmp = child->mm->start_data;
414 else if (addr == PT_TEXT_END_ADDR)
415 tmp = child->mm->end_code;
416 else if (addr == PT_TEXT_LEN)
417 tmp = child->mm->end_code - child->mm->start_code;
418 else
419 tmp = 0;
420 ret = put_user(tmp, datap);
421 break;
422 }
423
424 case PTRACE_POKEUSR:
425 ret = -EIO;
426 if ((addr & 3) || addr < 0 ||
427 addr > sizeof(struct user) - 3)
428 break;
429
430 if (addr < sizeof(struct pt_regs))
431 ret = put_stack_long(child, addr, data);
432 else if (addr >= offsetof(struct user, fpu) &&
433 addr < offsetof(struct user, u_fpvalid)) {
434 unsigned long index;
435 ret = init_fpu(child);
436 if (ret)
437 break;
438 index = addr - offsetof(struct user, fpu);
439 set_stopped_child_used_math(child);
440 ((unsigned long *)child->thread.xstate)
441 [index >> 2] = data;
442 ret = 0;
443 } else if (addr == offsetof(struct user, u_fpvalid)) {
444 conditional_stopped_child_used_math(data, child);
445 ret = 0;
446 }
447 break;
448
449 case PTRACE_GETREGS:
450 return copy_regset_to_user(child, &user_sh_native_view,
451 REGSET_GENERAL,
452 0, sizeof(struct pt_regs),
453 datap);
454 case PTRACE_SETREGS:
455 return copy_regset_from_user(child, &user_sh_native_view,
456 REGSET_GENERAL,
457 0, sizeof(struct pt_regs),
458 datap);
459#ifdef CONFIG_SH_FPU
460 case PTRACE_GETFPREGS:
461 return copy_regset_to_user(child, &user_sh_native_view,
462 REGSET_FPU,
463 0, sizeof(struct user_fpu_struct),
464 datap);
465 case PTRACE_SETFPREGS:
466 return copy_regset_from_user(child, &user_sh_native_view,
467 REGSET_FPU,
468 0, sizeof(struct user_fpu_struct),
469 datap);
470#endif
471#ifdef CONFIG_SH_DSP
472 case PTRACE_GETDSPREGS:
473 return copy_regset_to_user(child, &user_sh_native_view,
474 REGSET_DSP,
475 0, sizeof(struct pt_dspregs),
476 datap);
477 case PTRACE_SETDSPREGS:
478 return copy_regset_from_user(child, &user_sh_native_view,
479 REGSET_DSP,
480 0, sizeof(struct pt_dspregs),
481 datap);
482#endif
483 default:
484 ret = ptrace_request(child, request, addr, data);
485 break;
486 }
487
488 return ret;
489}
490
491static inline int audit_arch(void)
492{
493 int arch = EM_SH;
494
495#ifdef CONFIG_CPU_LITTLE_ENDIAN
496 arch |= __AUDIT_ARCH_LE;
497#endif
498
499 return arch;
500}
501
502asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
503{
504 long ret = 0;
505
506 secure_computing_strict(regs->regs[0]);
507
508 if (test_thread_flag(TIF_SYSCALL_TRACE) &&
509 tracehook_report_syscall_entry(regs))
510
511
512
513
514
515 ret = -1L;
516
517 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
518 trace_sys_enter(regs, regs->regs[0]);
519
520 audit_syscall_entry(audit_arch(), regs->regs[3],
521 regs->regs[4], regs->regs[5],
522 regs->regs[6], regs->regs[7]);
523
524 return ret ?: regs->regs[0];
525}
526
527asmlinkage void do_syscall_trace_leave(struct pt_regs *regs)
528{
529 int step;
530
531 audit_syscall_exit(regs);
532
533 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
534 trace_sys_exit(regs, regs->regs[0]);
535
536 step = test_thread_flag(TIF_SINGLESTEP);
537 if (step || test_thread_flag(TIF_SYSCALL_TRACE))
538 tracehook_report_syscall_exit(regs, step);
539}
540
