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