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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/system.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, int nmi,
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, 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 err = modify_user_hw_breakpoint(bp, &attr);
105 if (unlikely(err))
106 return err;
107 }
108
109 return 0;
110}
111
112void user_enable_single_step(struct task_struct *child)
113{
114 unsigned long pc = get_stack_long(child, offsetof(struct pt_regs, pc));
115
116 set_tsk_thread_flag(child, TIF_SINGLESTEP);
117
118 set_single_step(child, pc);
119}
120
121void user_disable_single_step(struct task_struct *child)
122{
123 clear_tsk_thread_flag(child, TIF_SINGLESTEP);
124}
125
126
127
128
129
130
131void ptrace_disable(struct task_struct *child)
132{
133 user_disable_single_step(child);
134}
135
136static int genregs_get(struct task_struct *target,
137 const struct user_regset *regset,
138 unsigned int pos, unsigned int count,
139 void *kbuf, void __user *ubuf)
140{
141 const struct pt_regs *regs = task_pt_regs(target);
142 int ret;
143
144 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
145 regs->regs,
146 0, 16 * sizeof(unsigned long));
147 if (!ret)
148
149 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
150 ®s->pc,
151 offsetof(struct pt_regs, pc),
152 sizeof(struct pt_regs));
153 if (!ret)
154 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
155 sizeof(struct pt_regs), -1);
156
157 return ret;
158}
159
160static int genregs_set(struct task_struct *target,
161 const struct user_regset *regset,
162 unsigned int pos, unsigned int count,
163 const void *kbuf, const void __user *ubuf)
164{
165 struct pt_regs *regs = task_pt_regs(target);
166 int ret;
167
168 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
169 regs->regs,
170 0, 16 * sizeof(unsigned long));
171 if (!ret && count > 0)
172 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
173 ®s->pc,
174 offsetof(struct pt_regs, pc),
175 sizeof(struct pt_regs));
176 if (!ret)
177 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
178 sizeof(struct pt_regs), -1);
179
180 return ret;
181}
182
183#ifdef CONFIG_SH_FPU
184int fpregs_get(struct task_struct *target,
185 const struct user_regset *regset,
186 unsigned int pos, unsigned int count,
187 void *kbuf, void __user *ubuf)
188{
189 int ret;
190
191 ret = init_fpu(target);
192 if (ret)
193 return ret;
194
195 if ((boot_cpu_data.flags & CPU_HAS_FPU))
196 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
197 &target->thread.xstate->hardfpu, 0, -1);
198
199 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
200 &target->thread.xstate->softfpu, 0, -1);
201}
202
203static int fpregs_set(struct task_struct *target,
204 const struct user_regset *regset,
205 unsigned int pos, unsigned int count,
206 const void *kbuf, const void __user *ubuf)
207{
208 int ret;
209
210 ret = init_fpu(target);
211 if (ret)
212 return ret;
213
214 set_stopped_child_used_math(target);
215
216 if ((boot_cpu_data.flags & CPU_HAS_FPU))
217 return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
218 &target->thread.xstate->hardfpu, 0, -1);
219
220 return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
221 &target->thread.xstate->softfpu, 0, -1);
222}
223
224static int fpregs_active(struct task_struct *target,
225 const struct user_regset *regset)
226{
227 return tsk_used_math(target) ? regset->n : 0;
228}
229#endif
230
231#ifdef CONFIG_SH_DSP
232static int dspregs_get(struct task_struct *target,
233 const struct user_regset *regset,
234 unsigned int pos, unsigned int count,
235 void *kbuf, void __user *ubuf)
236{
237 const struct pt_dspregs *regs =
238 (struct pt_dspregs *)&target->thread.dsp_status.dsp_regs;
239 int ret;
240
241 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, regs,
242 0, sizeof(struct pt_dspregs));
243 if (!ret)
244 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
245 sizeof(struct pt_dspregs), -1);
246
247 return ret;
248}
249
250static int dspregs_set(struct task_struct *target,
251 const struct user_regset *regset,
252 unsigned int pos, unsigned int count,
253 const void *kbuf, const void __user *ubuf)
254{
255 struct pt_dspregs *regs =
256 (struct pt_dspregs *)&target->thread.dsp_status.dsp_regs;
257 int ret;
258
259 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, regs,
260 0, sizeof(struct pt_dspregs));
261 if (!ret)
262 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
263 sizeof(struct pt_dspregs), -1);
264
265 return ret;
266}
267
268static int dspregs_active(struct task_struct *target,
269 const struct user_regset *regset)
270{
271 struct pt_regs *regs = task_pt_regs(target);
272
273 return regs->sr & SR_DSP ? regset->n : 0;
274}
275#endif
276
277
278
279
280enum sh_regset {
281 REGSET_GENERAL,
282#ifdef CONFIG_SH_FPU
283 REGSET_FPU,
284#endif
285#ifdef CONFIG_SH_DSP
286 REGSET_DSP,
287#endif
288};
289
290static const struct user_regset sh_regsets[] = {
291
292
293
294
295
296 [REGSET_GENERAL] = {
297 .core_note_type = NT_PRSTATUS,
298 .n = ELF_NGREG,
299 .size = sizeof(long),
300 .align = sizeof(long),
301 .get = genregs_get,
302 .set = genregs_set,
303 },
304
305#ifdef CONFIG_SH_FPU
306 [REGSET_FPU] = {
307 .core_note_type = NT_PRFPREG,
308 .n = sizeof(struct user_fpu_struct) / sizeof(long),
309 .size = sizeof(long),
310 .align = sizeof(long),
311 .get = fpregs_get,
312 .set = fpregs_set,
313 .active = fpregs_active,
314 },
315#endif
316
317#ifdef CONFIG_SH_DSP
318 [REGSET_DSP] = {
319 .n = sizeof(struct pt_dspregs) / sizeof(long),
320 .size = sizeof(long),
321 .align = sizeof(long),
322 .get = dspregs_get,
323 .set = dspregs_set,
324 .active = dspregs_active,
325 },
326#endif
327};
328
329static const struct user_regset_view user_sh_native_view = {
330 .name = "sh",
331 .e_machine = EM_SH,
332 .regsets = sh_regsets,
333 .n = ARRAY_SIZE(sh_regsets),
334};
335
336const struct user_regset_view *task_user_regset_view(struct task_struct *task)
337{
338 return &user_sh_native_view;
339}
340
341long arch_ptrace(struct task_struct *child, long request, long addr, long data)
342{
343 struct user * dummy = NULL;
344 unsigned long __user *datap = (unsigned long __user *)data;
345 int ret;
346
347 switch (request) {
348
349 case PTRACE_PEEKUSR: {
350 unsigned long tmp;
351
352 ret = -EIO;
353 if ((addr & 3) || addr < 0 ||
354 addr > sizeof(struct user) - 3)
355 break;
356
357 if (addr < sizeof(struct pt_regs))
358 tmp = get_stack_long(child, addr);
359 else if (addr >= (long) &dummy->fpu &&
360 addr < (long) &dummy->u_fpvalid) {
361 if (!tsk_used_math(child)) {
362 if (addr == (long)&dummy->fpu.fpscr)
363 tmp = FPSCR_INIT;
364 else
365 tmp = 0;
366 } else
367 tmp = ((long *)child->thread.xstate)
368 [(addr - (long)&dummy->fpu) >> 2];
369 } else if (addr == (long) &dummy->u_fpvalid)
370 tmp = !!tsk_used_math(child);
371 else if (addr == PT_TEXT_ADDR)
372 tmp = child->mm->start_code;
373 else if (addr == PT_DATA_ADDR)
374 tmp = child->mm->start_data;
375 else if (addr == PT_TEXT_END_ADDR)
376 tmp = child->mm->end_code;
377 else if (addr == PT_TEXT_LEN)
378 tmp = child->mm->end_code - child->mm->start_code;
379 else
380 tmp = 0;
381 ret = put_user(tmp, datap);
382 break;
383 }
384
385 case PTRACE_POKEUSR:
386 ret = -EIO;
387 if ((addr & 3) || addr < 0 ||
388 addr > sizeof(struct user) - 3)
389 break;
390
391 if (addr < sizeof(struct pt_regs))
392 ret = put_stack_long(child, addr, data);
393 else if (addr >= (long) &dummy->fpu &&
394 addr < (long) &dummy->u_fpvalid) {
395 set_stopped_child_used_math(child);
396 ((long *)child->thread.xstate)
397 [(addr - (long)&dummy->fpu) >> 2] = data;
398 ret = 0;
399 } else if (addr == (long) &dummy->u_fpvalid) {
400 conditional_stopped_child_used_math(data, child);
401 ret = 0;
402 }
403 break;
404
405 case PTRACE_GETREGS:
406 return copy_regset_to_user(child, &user_sh_native_view,
407 REGSET_GENERAL,
408 0, sizeof(struct pt_regs),
409 (void __user *)data);
410 case PTRACE_SETREGS:
411 return copy_regset_from_user(child, &user_sh_native_view,
412 REGSET_GENERAL,
413 0, sizeof(struct pt_regs),
414 (const void __user *)data);
415#ifdef CONFIG_SH_FPU
416 case PTRACE_GETFPREGS:
417 return copy_regset_to_user(child, &user_sh_native_view,
418 REGSET_FPU,
419 0, sizeof(struct user_fpu_struct),
420 (void __user *)data);
421 case PTRACE_SETFPREGS:
422 return copy_regset_from_user(child, &user_sh_native_view,
423 REGSET_FPU,
424 0, sizeof(struct user_fpu_struct),
425 (const void __user *)data);
426#endif
427#ifdef CONFIG_SH_DSP
428 case PTRACE_GETDSPREGS:
429 return copy_regset_to_user(child, &user_sh_native_view,
430 REGSET_DSP,
431 0, sizeof(struct pt_dspregs),
432 (void __user *)data);
433 case PTRACE_SETDSPREGS:
434 return copy_regset_from_user(child, &user_sh_native_view,
435 REGSET_DSP,
436 0, sizeof(struct pt_dspregs),
437 (const void __user *)data);
438#endif
439 default:
440 ret = ptrace_request(child, request, addr, data);
441 break;
442 }
443
444 return ret;
445}
446
447static inline int audit_arch(void)
448{
449 int arch = EM_SH;
450
451#ifdef CONFIG_CPU_LITTLE_ENDIAN
452 arch |= __AUDIT_ARCH_LE;
453#endif
454
455 return arch;
456}
457
458asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
459{
460 long ret = 0;
461
462 secure_computing(regs->regs[0]);
463
464 if (test_thread_flag(TIF_SYSCALL_TRACE) &&
465 tracehook_report_syscall_entry(regs))
466
467
468
469
470
471 ret = -1L;
472
473 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
474 trace_sys_enter(regs, regs->regs[0]);
475
476 if (unlikely(current->audit_context))
477 audit_syscall_entry(audit_arch(), regs->regs[3],
478 regs->regs[4], regs->regs[5],
479 regs->regs[6], regs->regs[7]);
480
481 return ret ?: regs->regs[0];
482}
483
484asmlinkage void do_syscall_trace_leave(struct pt_regs *regs)
485{
486 int step;
487
488 if (unlikely(current->audit_context))
489 audit_syscall_exit(AUDITSC_RESULT(regs->regs[0]),
490 regs->regs[0]);
491
492 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
493 trace_sys_exit(regs, regs->regs[0]);
494
495 step = test_thread_flag(TIF_SINGLESTEP);
496 if (step || test_thread_flag(TIF_SYSCALL_TRACE))
497 tracehook_report_syscall_exit(regs, step);
498}
499
