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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * SuperH process tracing
4 *
5 * Copyright (C) 1999, 2000 Kaz Kojima & Niibe Yutaka
6 * Copyright (C) 2002 - 2009 Paul Mundt
7 *
8 * Audit support by Yuichi Nakamura <ynakam@hitachisoft.jp>
9 */
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/elf.h>
24#include <linux/regset.h>
25#include <linux/hw_breakpoint.h>
26#include <linux/uaccess.h>
27#include <asm/processor.h>
28#include <asm/mmu_context.h>
29#include <asm/syscalls.h>
30#include <asm/fpu.h>
31
32#define CREATE_TRACE_POINTS
33#include <trace/events/syscalls.h>
34
35/*
36 * This routine will get a word off of the process kernel stack.
37 */
38static inline int get_stack_long(struct task_struct *task, int offset)
39{
40 unsigned char *stack;
41
42 stack = (unsigned char *)task_pt_regs(task);
43 stack += offset;
44 return (*((int *)stack));
45}
46
47/*
48 * This routine will put a word on the process kernel stack.
49 */
50static inline int put_stack_long(struct task_struct *task, int offset,
51 unsigned long data)
52{
53 unsigned char *stack;
54
55 stack = (unsigned char *)task_pt_regs(task);
56 stack += offset;
57 *(unsigned long *) stack = data;
58 return 0;
59}
60
61void ptrace_triggered(struct perf_event *bp,
62 struct perf_sample_data *data, struct pt_regs *regs)
63{
64 struct perf_event_attr attr;
65
66 /*
67 * Disable the breakpoint request here since ptrace has defined a
68 * one-shot behaviour for breakpoint exceptions.
69 */
70 attr = bp->attr;
71 attr.disabled = true;
72 modify_user_hw_breakpoint(bp, &attr);
73}
74
75static int set_single_step(struct task_struct *tsk, unsigned long addr)
76{
77 struct thread_struct *thread = &tsk->thread;
78 struct perf_event *bp;
79 struct perf_event_attr attr;
80
81 bp = thread->ptrace_bps[0];
82 if (!bp) {
83 ptrace_breakpoint_init(&attr);
84
85 attr.bp_addr = addr;
86 attr.bp_len = HW_BREAKPOINT_LEN_2;
87 attr.bp_type = HW_BREAKPOINT_R;
88
89 bp = register_user_hw_breakpoint(&attr, ptrace_triggered,
90 NULL, tsk);
91 if (IS_ERR(bp))
92 return PTR_ERR(bp);
93
94 thread->ptrace_bps[0] = bp;
95 } else {
96 int err;
97
98 attr = bp->attr;
99 attr.bp_addr = addr;
100 /* reenable breakpoint */
101 attr.disabled = false;
102 err = modify_user_hw_breakpoint(bp, &attr);
103 if (unlikely(err))
104 return err;
105 }
106
107 return 0;
108}
109
110void user_enable_single_step(struct task_struct *child)
111{
112 unsigned long pc = get_stack_long(child, offsetof(struct pt_regs, pc));
113
114 set_tsk_thread_flag(child, TIF_SINGLESTEP);
115
116 set_single_step(child, pc);
117}
118
119void user_disable_single_step(struct task_struct *child)
120{
121 clear_tsk_thread_flag(child, TIF_SINGLESTEP);
122}
123
124/*
125 * Called by kernel/ptrace.c when detaching..
126 *
127 * Make sure single step bits etc are not set.
128 */
129void ptrace_disable(struct task_struct *child)
130{
131 user_disable_single_step(child);
132}
133
134static int genregs_get(struct task_struct *target,
135 const struct user_regset *regset,
136 struct membuf to)
137{
138 const struct pt_regs *regs = task_pt_regs(target);
139
140 return membuf_write(&to, regs, sizeof(struct pt_regs));
141}
142
143static int genregs_set(struct task_struct *target,
144 const struct user_regset *regset,
145 unsigned int pos, unsigned int count,
146 const void *kbuf, const void __user *ubuf)
147{
148 struct pt_regs *regs = task_pt_regs(target);
149 int ret;
150
151 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
152 regs->regs,
153 0, 16 * sizeof(unsigned long));
154 if (!ret && count > 0)
155 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
156 ®s->pc,
157 offsetof(struct pt_regs, pc),
158 sizeof(struct pt_regs));
159 if (!ret)
160 user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
161 sizeof(struct pt_regs), -1);
162
163 return ret;
164}
165
166#ifdef CONFIG_SH_FPU
167static int fpregs_get(struct task_struct *target,
168 const struct user_regset *regset,
169 struct membuf to)
170{
171 int ret;
172
173 ret = init_fpu(target);
174 if (ret)
175 return ret;
176
177 return membuf_write(&to, target->thread.xstate,
178 sizeof(struct user_fpu_struct));
179}
180
181static int fpregs_set(struct task_struct *target,
182 const struct user_regset *regset,
183 unsigned int pos, unsigned int count,
184 const void *kbuf, const void __user *ubuf)
185{
186 int ret;
187
188 ret = init_fpu(target);
189 if (ret)
190 return ret;
191
192 set_stopped_child_used_math(target);
193
194 if ((boot_cpu_data.flags & CPU_HAS_FPU))
195 return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
196 &target->thread.xstate->hardfpu, 0, -1);
197
198 return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
199 &target->thread.xstate->softfpu, 0, -1);
200}
201
202static int fpregs_active(struct task_struct *target,
203 const struct user_regset *regset)
204{
205 return tsk_used_math(target) ? regset->n : 0;
206}
207#endif
208
209#ifdef CONFIG_SH_DSP
210static int dspregs_get(struct task_struct *target,
211 const struct user_regset *regset,
212 struct membuf to)
213{
214 const struct pt_dspregs *regs =
215 (struct pt_dspregs *)&target->thread.dsp_status.dsp_regs;
216
217 return membuf_write(&to, regs, sizeof(struct pt_dspregs));
218}
219
220static int dspregs_set(struct task_struct *target,
221 const struct user_regset *regset,
222 unsigned int pos, unsigned int count,
223 const void *kbuf, const void __user *ubuf)
224{
225 struct pt_dspregs *regs =
226 (struct pt_dspregs *)&target->thread.dsp_status.dsp_regs;
227 int ret;
228
229 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, regs,
230 0, sizeof(struct pt_dspregs));
231 if (!ret)
232 user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
233 sizeof(struct pt_dspregs), -1);
234
235 return ret;
236}
237
238static int dspregs_active(struct task_struct *target,
239 const struct user_regset *regset)
240{
241 struct pt_regs *regs = task_pt_regs(target);
242
243 return regs->sr & SR_DSP ? regset->n : 0;
244}
245#endif
246
247const struct pt_regs_offset regoffset_table[] = {
248 REGS_OFFSET_NAME(0),
249 REGS_OFFSET_NAME(1),
250 REGS_OFFSET_NAME(2),
251 REGS_OFFSET_NAME(3),
252 REGS_OFFSET_NAME(4),
253 REGS_OFFSET_NAME(5),
254 REGS_OFFSET_NAME(6),
255 REGS_OFFSET_NAME(7),
256 REGS_OFFSET_NAME(8),
257 REGS_OFFSET_NAME(9),
258 REGS_OFFSET_NAME(10),
259 REGS_OFFSET_NAME(11),
260 REGS_OFFSET_NAME(12),
261 REGS_OFFSET_NAME(13),
262 REGS_OFFSET_NAME(14),
263 REGS_OFFSET_NAME(15),
264 REG_OFFSET_NAME(pc),
265 REG_OFFSET_NAME(pr),
266 REG_OFFSET_NAME(sr),
267 REG_OFFSET_NAME(gbr),
268 REG_OFFSET_NAME(mach),
269 REG_OFFSET_NAME(macl),
270 REG_OFFSET_NAME(tra),
271 REG_OFFSET_END,
272};
273
274/*
275 * These are our native regset flavours.
276 */
277enum sh_regset {
278 REGSET_GENERAL,
279#ifdef CONFIG_SH_FPU
280 REGSET_FPU,
281#endif
282#ifdef CONFIG_SH_DSP
283 REGSET_DSP,
284#endif
285};
286
287static const struct user_regset sh_regsets[] = {
288 /*
289 * Format is:
290 * R0 --> R15
291 * PC, PR, SR, GBR, MACH, MACL, TRA
292 */
293 [REGSET_GENERAL] = {
294 .core_note_type = NT_PRSTATUS,
295 .n = ELF_NGREG,
296 .size = sizeof(long),
297 .align = sizeof(long),
298 .regset_get = genregs_get,
299 .set = genregs_set,
300 },
301
302#ifdef CONFIG_SH_FPU
303 [REGSET_FPU] = {
304 .core_note_type = NT_PRFPREG,
305 .n = sizeof(struct user_fpu_struct) / sizeof(long),
306 .size = sizeof(long),
307 .align = sizeof(long),
308 .regset_get = fpregs_get,
309 .set = fpregs_set,
310 .active = fpregs_active,
311 },
312#endif
313
314#ifdef CONFIG_SH_DSP
315 [REGSET_DSP] = {
316 .n = sizeof(struct pt_dspregs) / sizeof(long),
317 .size = sizeof(long),
318 .align = sizeof(long),
319 .regset_get = dspregs_get,
320 .set = dspregs_set,
321 .active = dspregs_active,
322 },
323#endif
324};
325
326static const struct user_regset_view user_sh_native_view = {
327 .name = "sh",
328 .e_machine = EM_SH,
329 .regsets = sh_regsets,
330 .n = ARRAY_SIZE(sh_regsets),
331};
332
333const struct user_regset_view *task_user_regset_view(struct task_struct *task)
334{
335 return &user_sh_native_view;
336}
337
338long arch_ptrace(struct task_struct *child, long request,
339 unsigned long addr, unsigned long data)
340{
341 unsigned long __user *datap = (unsigned long __user *)data;
342 int ret;
343
344 switch (request) {
345 /* read the word at location addr in the USER area. */
346 case PTRACE_PEEKUSR: {
347 unsigned long tmp;
348
349 ret = -EIO;
350 if ((addr & 3) || addr < 0 ||
351 addr > sizeof(struct user) - 3)
352 break;
353
354 if (addr < sizeof(struct pt_regs))
355 tmp = get_stack_long(child, addr);
356 else if (addr >= offsetof(struct user, fpu) &&
357 addr < offsetof(struct user, u_fpvalid)) {
358 if (!tsk_used_math(child)) {
359 if (addr == offsetof(struct user, fpu.fpscr))
360 tmp = FPSCR_INIT;
361 else
362 tmp = 0;
363 } else {
364 unsigned long index;
365 ret = init_fpu(child);
366 if (ret)
367 break;
368 index = addr - offsetof(struct user, fpu);
369 tmp = ((unsigned long *)child->thread.xstate)
370 [index >> 2];
371 }
372 } else if (addr == offsetof(struct user, u_fpvalid))
373 tmp = !!tsk_used_math(child);
374 else if (addr == PT_TEXT_ADDR)
375 tmp = child->mm->start_code;
376 else if (addr == PT_DATA_ADDR)
377 tmp = child->mm->start_data;
378 else if (addr == PT_TEXT_END_ADDR)
379 tmp = child->mm->end_code;
380 else if (addr == PT_TEXT_LEN)
381 tmp = child->mm->end_code - child->mm->start_code;
382 else
383 tmp = 0;
384 ret = put_user(tmp, datap);
385 break;
386 }
387
388 case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
389 ret = -EIO;
390 if ((addr & 3) || addr < 0 ||
391 addr > sizeof(struct user) - 3)
392 break;
393
394 if (addr < sizeof(struct pt_regs))
395 ret = put_stack_long(child, addr, data);
396 else if (addr >= offsetof(struct user, fpu) &&
397 addr < offsetof(struct user, u_fpvalid)) {
398 unsigned long index;
399 ret = init_fpu(child);
400 if (ret)
401 break;
402 index = addr - offsetof(struct user, fpu);
403 set_stopped_child_used_math(child);
404 ((unsigned long *)child->thread.xstate)
405 [index >> 2] = data;
406 ret = 0;
407 } else if (addr == offsetof(struct user, u_fpvalid)) {
408 conditional_stopped_child_used_math(data, child);
409 ret = 0;
410 }
411 break;
412
413 case PTRACE_GETREGS:
414 return copy_regset_to_user(child, &user_sh_native_view,
415 REGSET_GENERAL,
416 0, sizeof(struct pt_regs),
417 datap);
418 case PTRACE_SETREGS:
419 return copy_regset_from_user(child, &user_sh_native_view,
420 REGSET_GENERAL,
421 0, sizeof(struct pt_regs),
422 datap);
423#ifdef CONFIG_SH_FPU
424 case PTRACE_GETFPREGS:
425 return copy_regset_to_user(child, &user_sh_native_view,
426 REGSET_FPU,
427 0, sizeof(struct user_fpu_struct),
428 datap);
429 case PTRACE_SETFPREGS:
430 return copy_regset_from_user(child, &user_sh_native_view,
431 REGSET_FPU,
432 0, sizeof(struct user_fpu_struct),
433 datap);
434#endif
435#ifdef CONFIG_SH_DSP
436 case PTRACE_GETDSPREGS:
437 return copy_regset_to_user(child, &user_sh_native_view,
438 REGSET_DSP,
439 0, sizeof(struct pt_dspregs),
440 datap);
441 case PTRACE_SETDSPREGS:
442 return copy_regset_from_user(child, &user_sh_native_view,
443 REGSET_DSP,
444 0, sizeof(struct pt_dspregs),
445 datap);
446#endif
447 default:
448 ret = ptrace_request(child, request, addr, data);
449 break;
450 }
451
452 return ret;
453}
454
455asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
456{
457 if (test_thread_flag(TIF_SYSCALL_TRACE) &&
458 ptrace_report_syscall_entry(regs)) {
459 regs->regs[0] = -ENOSYS;
460 return -1;
461 }
462
463 if (secure_computing() == -1)
464 return -1;
465
466 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
467 trace_sys_enter(regs, regs->regs[0]);
468
469 audit_syscall_entry(regs->regs[3], regs->regs[4], regs->regs[5],
470 regs->regs[6], regs->regs[7]);
471
472 return 0;
473}
474
475asmlinkage void do_syscall_trace_leave(struct pt_regs *regs)
476{
477 int step;
478
479 audit_syscall_exit(regs);
480
481 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
482 trace_sys_exit(regs, regs->regs[0]);
483
484 step = test_thread_flag(TIF_SINGLESTEP);
485 if (step || test_thread_flag(TIF_SYSCALL_TRACE))
486 ptrace_report_syscall_exit(regs, step);
487}
1/*
2 * SuperH process tracing
3 *
4 * Copyright (C) 1999, 2000 Kaz Kojima & Niibe Yutaka
5 * Copyright (C) 2002 - 2009 Paul Mundt
6 *
7 * Audit support by Yuichi Nakamura <ynakam@hitachisoft.jp>
8 *
9 * This file is subject to the terms and conditions of the GNU General Public
10 * License. See the file "COPYING" in the main directory of this archive
11 * for more details.
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/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 * This routine will get a word off of the process kernel stack.
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 * This routine will put a word on the process kernel stack.
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 * Disable the breakpoint request here since ptrace has defined a
73 * one-shot behaviour for breakpoint exceptions.
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 /* reenable breakpoint */
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 if (ptrace_get_breakpoints(child) < 0)
122 return;
123
124 set_single_step(child, pc);
125 ptrace_put_breakpoints(child);
126}
127
128void user_disable_single_step(struct task_struct *child)
129{
130 clear_tsk_thread_flag(child, TIF_SINGLESTEP);
131}
132
133/*
134 * Called by kernel/ptrace.c when detaching..
135 *
136 * Make sure single step bits etc are not set.
137 */
138void ptrace_disable(struct task_struct *child)
139{
140 user_disable_single_step(child);
141}
142
143static int genregs_get(struct task_struct *target,
144 const struct user_regset *regset,
145 unsigned int pos, unsigned int count,
146 void *kbuf, void __user *ubuf)
147{
148 const struct pt_regs *regs = task_pt_regs(target);
149 int ret;
150
151 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
152 regs->regs,
153 0, 16 * sizeof(unsigned long));
154 if (!ret)
155 /* PC, PR, SR, GBR, MACH, MACL, TRA */
156 ret = user_regset_copyout(&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_copyout_zero(&pos, &count, &kbuf, &ubuf,
162 sizeof(struct pt_regs), -1);
163
164 return ret;
165}
166
167static int genregs_set(struct task_struct *target,
168 const struct user_regset *regset,
169 unsigned int pos, unsigned int count,
170 const void *kbuf, const void __user *ubuf)
171{
172 struct pt_regs *regs = task_pt_regs(target);
173 int ret;
174
175 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
176 regs->regs,
177 0, 16 * sizeof(unsigned long));
178 if (!ret && count > 0)
179 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
180 ®s->pc,
181 offsetof(struct pt_regs, pc),
182 sizeof(struct pt_regs));
183 if (!ret)
184 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
185 sizeof(struct pt_regs), -1);
186
187 return ret;
188}
189
190#ifdef CONFIG_SH_FPU
191int fpregs_get(struct task_struct *target,
192 const struct user_regset *regset,
193 unsigned int pos, unsigned int count,
194 void *kbuf, void __user *ubuf)
195{
196 int ret;
197
198 ret = init_fpu(target);
199 if (ret)
200 return ret;
201
202 if ((boot_cpu_data.flags & CPU_HAS_FPU))
203 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
204 &target->thread.xstate->hardfpu, 0, -1);
205
206 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
207 &target->thread.xstate->softfpu, 0, -1);
208}
209
210static int fpregs_set(struct task_struct *target,
211 const struct user_regset *regset,
212 unsigned int pos, unsigned int count,
213 const void *kbuf, const void __user *ubuf)
214{
215 int ret;
216
217 ret = init_fpu(target);
218 if (ret)
219 return ret;
220
221 set_stopped_child_used_math(target);
222
223 if ((boot_cpu_data.flags & CPU_HAS_FPU))
224 return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
225 &target->thread.xstate->hardfpu, 0, -1);
226
227 return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
228 &target->thread.xstate->softfpu, 0, -1);
229}
230
231static int fpregs_active(struct task_struct *target,
232 const struct user_regset *regset)
233{
234 return tsk_used_math(target) ? regset->n : 0;
235}
236#endif
237
238#ifdef CONFIG_SH_DSP
239static int dspregs_get(struct task_struct *target,
240 const struct user_regset *regset,
241 unsigned int pos, unsigned int count,
242 void *kbuf, void __user *ubuf)
243{
244 const struct pt_dspregs *regs =
245 (struct pt_dspregs *)&target->thread.dsp_status.dsp_regs;
246 int ret;
247
248 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, regs,
249 0, sizeof(struct pt_dspregs));
250 if (!ret)
251 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
252 sizeof(struct pt_dspregs), -1);
253
254 return ret;
255}
256
257static int dspregs_set(struct task_struct *target,
258 const struct user_regset *regset,
259 unsigned int pos, unsigned int count,
260 const void *kbuf, const void __user *ubuf)
261{
262 struct pt_dspregs *regs =
263 (struct pt_dspregs *)&target->thread.dsp_status.dsp_regs;
264 int ret;
265
266 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, regs,
267 0, sizeof(struct pt_dspregs));
268 if (!ret)
269 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
270 sizeof(struct pt_dspregs), -1);
271
272 return ret;
273}
274
275static int dspregs_active(struct task_struct *target,
276 const struct user_regset *regset)
277{
278 struct pt_regs *regs = task_pt_regs(target);
279
280 return regs->sr & SR_DSP ? regset->n : 0;
281}
282#endif
283
284const struct pt_regs_offset regoffset_table[] = {
285 REGS_OFFSET_NAME(0),
286 REGS_OFFSET_NAME(1),
287 REGS_OFFSET_NAME(2),
288 REGS_OFFSET_NAME(3),
289 REGS_OFFSET_NAME(4),
290 REGS_OFFSET_NAME(5),
291 REGS_OFFSET_NAME(6),
292 REGS_OFFSET_NAME(7),
293 REGS_OFFSET_NAME(8),
294 REGS_OFFSET_NAME(9),
295 REGS_OFFSET_NAME(10),
296 REGS_OFFSET_NAME(11),
297 REGS_OFFSET_NAME(12),
298 REGS_OFFSET_NAME(13),
299 REGS_OFFSET_NAME(14),
300 REGS_OFFSET_NAME(15),
301 REG_OFFSET_NAME(pc),
302 REG_OFFSET_NAME(pr),
303 REG_OFFSET_NAME(sr),
304 REG_OFFSET_NAME(gbr),
305 REG_OFFSET_NAME(mach),
306 REG_OFFSET_NAME(macl),
307 REG_OFFSET_NAME(tra),
308 REG_OFFSET_END,
309};
310
311/*
312 * These are our native regset flavours.
313 */
314enum sh_regset {
315 REGSET_GENERAL,
316#ifdef CONFIG_SH_FPU
317 REGSET_FPU,
318#endif
319#ifdef CONFIG_SH_DSP
320 REGSET_DSP,
321#endif
322};
323
324static const struct user_regset sh_regsets[] = {
325 /*
326 * Format is:
327 * R0 --> R15
328 * PC, PR, SR, GBR, MACH, MACL, TRA
329 */
330 [REGSET_GENERAL] = {
331 .core_note_type = NT_PRSTATUS,
332 .n = ELF_NGREG,
333 .size = sizeof(long),
334 .align = sizeof(long),
335 .get = genregs_get,
336 .set = genregs_set,
337 },
338
339#ifdef CONFIG_SH_FPU
340 [REGSET_FPU] = {
341 .core_note_type = NT_PRFPREG,
342 .n = sizeof(struct user_fpu_struct) / sizeof(long),
343 .size = sizeof(long),
344 .align = sizeof(long),
345 .get = fpregs_get,
346 .set = fpregs_set,
347 .active = fpregs_active,
348 },
349#endif
350
351#ifdef CONFIG_SH_DSP
352 [REGSET_DSP] = {
353 .n = sizeof(struct pt_dspregs) / sizeof(long),
354 .size = sizeof(long),
355 .align = sizeof(long),
356 .get = dspregs_get,
357 .set = dspregs_set,
358 .active = dspregs_active,
359 },
360#endif
361};
362
363static const struct user_regset_view user_sh_native_view = {
364 .name = "sh",
365 .e_machine = EM_SH,
366 .regsets = sh_regsets,
367 .n = ARRAY_SIZE(sh_regsets),
368};
369
370const struct user_regset_view *task_user_regset_view(struct task_struct *task)
371{
372 return &user_sh_native_view;
373}
374
375long arch_ptrace(struct task_struct *child, long request,
376 unsigned long addr, unsigned long data)
377{
378 unsigned long __user *datap = (unsigned long __user *)data;
379 int ret;
380
381 switch (request) {
382 /* read the word at location addr in the USER area. */
383 case PTRACE_PEEKUSR: {
384 unsigned long tmp;
385
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 tmp = get_stack_long(child, addr);
393 else if (addr >= offsetof(struct user, fpu) &&
394 addr < offsetof(struct user, u_fpvalid)) {
395 if (!tsk_used_math(child)) {
396 if (addr == offsetof(struct user, fpu.fpscr))
397 tmp = FPSCR_INIT;
398 else
399 tmp = 0;
400 } else {
401 unsigned long index;
402 ret = init_fpu(child);
403 if (ret)
404 break;
405 index = addr - offsetof(struct user, fpu);
406 tmp = ((unsigned long *)child->thread.xstate)
407 [index >> 2];
408 }
409 } else if (addr == offsetof(struct user, u_fpvalid))
410 tmp = !!tsk_used_math(child);
411 else if (addr == PT_TEXT_ADDR)
412 tmp = child->mm->start_code;
413 else if (addr == PT_DATA_ADDR)
414 tmp = child->mm->start_data;
415 else if (addr == PT_TEXT_END_ADDR)
416 tmp = child->mm->end_code;
417 else if (addr == PT_TEXT_LEN)
418 tmp = child->mm->end_code - child->mm->start_code;
419 else
420 tmp = 0;
421 ret = put_user(tmp, datap);
422 break;
423 }
424
425 case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
426 ret = -EIO;
427 if ((addr & 3) || addr < 0 ||
428 addr > sizeof(struct user) - 3)
429 break;
430
431 if (addr < sizeof(struct pt_regs))
432 ret = put_stack_long(child, addr, data);
433 else if (addr >= offsetof(struct user, fpu) &&
434 addr < offsetof(struct user, u_fpvalid)) {
435 unsigned long index;
436 ret = init_fpu(child);
437 if (ret)
438 break;
439 index = addr - offsetof(struct user, fpu);
440 set_stopped_child_used_math(child);
441 ((unsigned long *)child->thread.xstate)
442 [index >> 2] = data;
443 ret = 0;
444 } else if (addr == offsetof(struct user, u_fpvalid)) {
445 conditional_stopped_child_used_math(data, child);
446 ret = 0;
447 }
448 break;
449
450 case PTRACE_GETREGS:
451 return copy_regset_to_user(child, &user_sh_native_view,
452 REGSET_GENERAL,
453 0, sizeof(struct pt_regs),
454 datap);
455 case PTRACE_SETREGS:
456 return copy_regset_from_user(child, &user_sh_native_view,
457 REGSET_GENERAL,
458 0, sizeof(struct pt_regs),
459 datap);
460#ifdef CONFIG_SH_FPU
461 case PTRACE_GETFPREGS:
462 return copy_regset_to_user(child, &user_sh_native_view,
463 REGSET_FPU,
464 0, sizeof(struct user_fpu_struct),
465 datap);
466 case PTRACE_SETFPREGS:
467 return copy_regset_from_user(child, &user_sh_native_view,
468 REGSET_FPU,
469 0, sizeof(struct user_fpu_struct),
470 datap);
471#endif
472#ifdef CONFIG_SH_DSP
473 case PTRACE_GETDSPREGS:
474 return copy_regset_to_user(child, &user_sh_native_view,
475 REGSET_DSP,
476 0, sizeof(struct pt_dspregs),
477 datap);
478 case PTRACE_SETDSPREGS:
479 return copy_regset_from_user(child, &user_sh_native_view,
480 REGSET_DSP,
481 0, sizeof(struct pt_dspregs),
482 datap);
483#endif
484 default:
485 ret = ptrace_request(child, request, addr, data);
486 break;
487 }
488
489 return ret;
490}
491
492static inline int audit_arch(void)
493{
494 int arch = EM_SH;
495
496#ifdef CONFIG_CPU_LITTLE_ENDIAN
497 arch |= __AUDIT_ARCH_LE;
498#endif
499
500 return arch;
501}
502
503asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
504{
505 long ret = 0;
506
507 secure_computing(regs->regs[0]);
508
509 if (test_thread_flag(TIF_SYSCALL_TRACE) &&
510 tracehook_report_syscall_entry(regs))
511 /*
512 * Tracing decided this syscall should not happen.
513 * We'll return a bogus call number to get an ENOSYS
514 * error, but leave the original number in regs->regs[0].
515 */
516 ret = -1L;
517
518 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
519 trace_sys_enter(regs, regs->regs[0]);
520
521 if (unlikely(current->audit_context))
522 audit_syscall_entry(audit_arch(), regs->regs[3],
523 regs->regs[4], regs->regs[5],
524 regs->regs[6], regs->regs[7]);
525
526 return ret ?: regs->regs[0];
527}
528
529asmlinkage void do_syscall_trace_leave(struct pt_regs *regs)
530{
531 int step;
532
533 if (unlikely(current->audit_context))
534 audit_syscall_exit(AUDITSC_RESULT(regs->regs[0]),
535 regs->regs[0]);
536
537 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
538 trace_sys_exit(regs, regs->regs[0]);
539
540 step = test_thread_flag(TIF_SINGLESTEP);
541 if (step || test_thread_flag(TIF_SYSCALL_TRACE))
542 tracehook_report_syscall_exit(regs, step);
543}