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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/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 * This routine will get a word off of the process kernel stack.
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 * This routine will put a word on the process kernel stack.
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 * Disable the breakpoint request here since ptrace has defined a
72 * one-shot behaviour for breakpoint exceptions.
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 /* reenable breakpoint */
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 set_single_step(child, pc);
121}
122
123void user_disable_single_step(struct task_struct *child)
124{
125 clear_tsk_thread_flag(child, TIF_SINGLESTEP);
126}
127
128/*
129 * Called by kernel/ptrace.c when detaching..
130 *
131 * Make sure single step bits etc are not set.
132 */
133void ptrace_disable(struct task_struct *child)
134{
135 user_disable_single_step(child);
136}
137
138static int genregs_get(struct task_struct *target,
139 const struct user_regset *regset,
140 unsigned int pos, unsigned int count,
141 void *kbuf, void __user *ubuf)
142{
143 const struct pt_regs *regs = task_pt_regs(target);
144 int ret;
145
146 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
147 regs->regs,
148 0, 16 * sizeof(unsigned long));
149 if (!ret)
150 /* PC, PR, SR, GBR, MACH, MACL, TRA */
151 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
152 ®s->pc,
153 offsetof(struct pt_regs, pc),
154 sizeof(struct pt_regs));
155 if (!ret)
156 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
157 sizeof(struct pt_regs), -1);
158
159 return ret;
160}
161
162static int genregs_set(struct task_struct *target,
163 const struct user_regset *regset,
164 unsigned int pos, unsigned int count,
165 const void *kbuf, const void __user *ubuf)
166{
167 struct pt_regs *regs = task_pt_regs(target);
168 int ret;
169
170 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
171 regs->regs,
172 0, 16 * sizeof(unsigned long));
173 if (!ret && count > 0)
174 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
175 ®s->pc,
176 offsetof(struct pt_regs, pc),
177 sizeof(struct pt_regs));
178 if (!ret)
179 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
180 sizeof(struct pt_regs), -1);
181
182 return ret;
183}
184
185#ifdef CONFIG_SH_FPU
186int fpregs_get(struct task_struct *target,
187 const struct user_regset *regset,
188 unsigned int pos, unsigned int count,
189 void *kbuf, void __user *ubuf)
190{
191 int ret;
192
193 ret = init_fpu(target);
194 if (ret)
195 return ret;
196
197 if ((boot_cpu_data.flags & CPU_HAS_FPU))
198 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
199 &target->thread.xstate->hardfpu, 0, -1);
200
201 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
202 &target->thread.xstate->softfpu, 0, -1);
203}
204
205static int fpregs_set(struct task_struct *target,
206 const struct user_regset *regset,
207 unsigned int pos, unsigned int count,
208 const void *kbuf, const void __user *ubuf)
209{
210 int ret;
211
212 ret = init_fpu(target);
213 if (ret)
214 return ret;
215
216 set_stopped_child_used_math(target);
217
218 if ((boot_cpu_data.flags & CPU_HAS_FPU))
219 return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
220 &target->thread.xstate->hardfpu, 0, -1);
221
222 return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
223 &target->thread.xstate->softfpu, 0, -1);
224}
225
226static int fpregs_active(struct task_struct *target,
227 const struct user_regset *regset)
228{
229 return tsk_used_math(target) ? regset->n : 0;
230}
231#endif
232
233#ifdef CONFIG_SH_DSP
234static int dspregs_get(struct task_struct *target,
235 const struct user_regset *regset,
236 unsigned int pos, unsigned int count,
237 void *kbuf, void __user *ubuf)
238{
239 const struct pt_dspregs *regs =
240 (struct pt_dspregs *)&target->thread.dsp_status.dsp_regs;
241 int ret;
242
243 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, regs,
244 0, sizeof(struct pt_dspregs));
245 if (!ret)
246 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
247 sizeof(struct pt_dspregs), -1);
248
249 return ret;
250}
251
252static int dspregs_set(struct task_struct *target,
253 const struct user_regset *regset,
254 unsigned int pos, unsigned int count,
255 const void *kbuf, const void __user *ubuf)
256{
257 struct pt_dspregs *regs =
258 (struct pt_dspregs *)&target->thread.dsp_status.dsp_regs;
259 int ret;
260
261 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, regs,
262 0, sizeof(struct pt_dspregs));
263 if (!ret)
264 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
265 sizeof(struct pt_dspregs), -1);
266
267 return ret;
268}
269
270static int dspregs_active(struct task_struct *target,
271 const struct user_regset *regset)
272{
273 struct pt_regs *regs = task_pt_regs(target);
274
275 return regs->sr & SR_DSP ? regset->n : 0;
276}
277#endif
278
279const struct pt_regs_offset regoffset_table[] = {
280 REGS_OFFSET_NAME(0),
281 REGS_OFFSET_NAME(1),
282 REGS_OFFSET_NAME(2),
283 REGS_OFFSET_NAME(3),
284 REGS_OFFSET_NAME(4),
285 REGS_OFFSET_NAME(5),
286 REGS_OFFSET_NAME(6),
287 REGS_OFFSET_NAME(7),
288 REGS_OFFSET_NAME(8),
289 REGS_OFFSET_NAME(9),
290 REGS_OFFSET_NAME(10),
291 REGS_OFFSET_NAME(11),
292 REGS_OFFSET_NAME(12),
293 REGS_OFFSET_NAME(13),
294 REGS_OFFSET_NAME(14),
295 REGS_OFFSET_NAME(15),
296 REG_OFFSET_NAME(pc),
297 REG_OFFSET_NAME(pr),
298 REG_OFFSET_NAME(sr),
299 REG_OFFSET_NAME(gbr),
300 REG_OFFSET_NAME(mach),
301 REG_OFFSET_NAME(macl),
302 REG_OFFSET_NAME(tra),
303 REG_OFFSET_END,
304};
305
306/*
307 * These are our native regset flavours.
308 */
309enum sh_regset {
310 REGSET_GENERAL,
311#ifdef CONFIG_SH_FPU
312 REGSET_FPU,
313#endif
314#ifdef CONFIG_SH_DSP
315 REGSET_DSP,
316#endif
317};
318
319static const struct user_regset sh_regsets[] = {
320 /*
321 * Format is:
322 * R0 --> R15
323 * PC, PR, SR, GBR, MACH, MACL, TRA
324 */
325 [REGSET_GENERAL] = {
326 .core_note_type = NT_PRSTATUS,
327 .n = ELF_NGREG,
328 .size = sizeof(long),
329 .align = sizeof(long),
330 .get = genregs_get,
331 .set = genregs_set,
332 },
333
334#ifdef CONFIG_SH_FPU
335 [REGSET_FPU] = {
336 .core_note_type = NT_PRFPREG,
337 .n = sizeof(struct user_fpu_struct) / sizeof(long),
338 .size = sizeof(long),
339 .align = sizeof(long),
340 .get = fpregs_get,
341 .set = fpregs_set,
342 .active = fpregs_active,
343 },
344#endif
345
346#ifdef CONFIG_SH_DSP
347 [REGSET_DSP] = {
348 .n = sizeof(struct pt_dspregs) / sizeof(long),
349 .size = sizeof(long),
350 .align = sizeof(long),
351 .get = dspregs_get,
352 .set = dspregs_set,
353 .active = dspregs_active,
354 },
355#endif
356};
357
358static const struct user_regset_view user_sh_native_view = {
359 .name = "sh",
360 .e_machine = EM_SH,
361 .regsets = sh_regsets,
362 .n = ARRAY_SIZE(sh_regsets),
363};
364
365const struct user_regset_view *task_user_regset_view(struct task_struct *task)
366{
367 return &user_sh_native_view;
368}
369
370long arch_ptrace(struct task_struct *child, long request,
371 unsigned long addr, unsigned long data)
372{
373 unsigned long __user *datap = (unsigned long __user *)data;
374 int ret;
375
376 switch (request) {
377 /* read the word at location addr in the USER area. */
378 case PTRACE_PEEKUSR: {
379 unsigned long tmp;
380
381 ret = -EIO;
382 if ((addr & 3) || addr < 0 ||
383 addr > sizeof(struct user) - 3)
384 break;
385
386 if (addr < sizeof(struct pt_regs))
387 tmp = get_stack_long(child, addr);
388 else if (addr >= offsetof(struct user, fpu) &&
389 addr < offsetof(struct user, u_fpvalid)) {
390 if (!tsk_used_math(child)) {
391 if (addr == offsetof(struct user, fpu.fpscr))
392 tmp = FPSCR_INIT;
393 else
394 tmp = 0;
395 } else {
396 unsigned long index;
397 ret = init_fpu(child);
398 if (ret)
399 break;
400 index = addr - offsetof(struct user, fpu);
401 tmp = ((unsigned long *)child->thread.xstate)
402 [index >> 2];
403 }
404 } else if (addr == offsetof(struct user, u_fpvalid))
405 tmp = !!tsk_used_math(child);
406 else if (addr == PT_TEXT_ADDR)
407 tmp = child->mm->start_code;
408 else if (addr == PT_DATA_ADDR)
409 tmp = child->mm->start_data;
410 else if (addr == PT_TEXT_END_ADDR)
411 tmp = child->mm->end_code;
412 else if (addr == PT_TEXT_LEN)
413 tmp = child->mm->end_code - child->mm->start_code;
414 else
415 tmp = 0;
416 ret = put_user(tmp, datap);
417 break;
418 }
419
420 case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
421 ret = -EIO;
422 if ((addr & 3) || addr < 0 ||
423 addr > sizeof(struct user) - 3)
424 break;
425
426 if (addr < sizeof(struct pt_regs))
427 ret = put_stack_long(child, addr, data);
428 else if (addr >= offsetof(struct user, fpu) &&
429 addr < offsetof(struct user, u_fpvalid)) {
430 unsigned long index;
431 ret = init_fpu(child);
432 if (ret)
433 break;
434 index = addr - offsetof(struct user, fpu);
435 set_stopped_child_used_math(child);
436 ((unsigned long *)child->thread.xstate)
437 [index >> 2] = data;
438 ret = 0;
439 } else if (addr == offsetof(struct user, u_fpvalid)) {
440 conditional_stopped_child_used_math(data, child);
441 ret = 0;
442 }
443 break;
444
445 case PTRACE_GETREGS:
446 return copy_regset_to_user(child, &user_sh_native_view,
447 REGSET_GENERAL,
448 0, sizeof(struct pt_regs),
449 datap);
450 case PTRACE_SETREGS:
451 return copy_regset_from_user(child, &user_sh_native_view,
452 REGSET_GENERAL,
453 0, sizeof(struct pt_regs),
454 datap);
455#ifdef CONFIG_SH_FPU
456 case PTRACE_GETFPREGS:
457 return copy_regset_to_user(child, &user_sh_native_view,
458 REGSET_FPU,
459 0, sizeof(struct user_fpu_struct),
460 datap);
461 case PTRACE_SETFPREGS:
462 return copy_regset_from_user(child, &user_sh_native_view,
463 REGSET_FPU,
464 0, sizeof(struct user_fpu_struct),
465 datap);
466#endif
467#ifdef CONFIG_SH_DSP
468 case PTRACE_GETDSPREGS:
469 return copy_regset_to_user(child, &user_sh_native_view,
470 REGSET_DSP,
471 0, sizeof(struct pt_dspregs),
472 datap);
473 case PTRACE_SETDSPREGS:
474 return copy_regset_from_user(child, &user_sh_native_view,
475 REGSET_DSP,
476 0, sizeof(struct pt_dspregs),
477 datap);
478#endif
479 default:
480 ret = ptrace_request(child, request, addr, data);
481 break;
482 }
483
484 return ret;
485}
486
487static inline int audit_arch(void)
488{
489 int arch = EM_SH;
490
491#ifdef CONFIG_CPU_LITTLE_ENDIAN
492 arch |= __AUDIT_ARCH_LE;
493#endif
494
495 return arch;
496}
497
498asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
499{
500 long ret = 0;
501
502 secure_computing_strict(regs->regs[0]);
503
504 if (test_thread_flag(TIF_SYSCALL_TRACE) &&
505 tracehook_report_syscall_entry(regs))
506 /*
507 * Tracing decided this syscall should not happen.
508 * We'll return a bogus call number to get an ENOSYS
509 * error, but leave the original number in regs->regs[0].
510 */
511 ret = -1L;
512
513 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
514 trace_sys_enter(regs, regs->regs[0]);
515
516 audit_syscall_entry(audit_arch(), regs->regs[3],
517 regs->regs[4], regs->regs[5],
518 regs->regs[6], regs->regs[7]);
519
520 return ret ?: regs->regs[0];
521}
522
523asmlinkage void do_syscall_trace_leave(struct pt_regs *regs)
524{
525 int step;
526
527 audit_syscall_exit(regs);
528
529 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
530 trace_sys_exit(regs, regs->regs[0]);
531
532 step = test_thread_flag(TIF_SINGLESTEP);
533 if (step || test_thread_flag(TIF_SYSCALL_TRACE))
534 tracehook_report_syscall_exit(regs, step);
535}
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}