2 * SuperH process tracing
4 * Copyright (C) 1999, 2000 Kaz Kojima & Niibe Yutaka
5 * Copyright (C) 2002 - 2009 Paul Mundt
7 * Audit support by Yuichi Nakamura <ynakam@hitachisoft.jp>
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
13 #include <linux/kernel.h>
14 #include <linux/sched.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>
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>
37 #define CREATE_TRACE_POINTS
38 #include <trace/events/syscalls.h>
41 * This routine will get a word off of the process kernel stack.
43 static inline int get_stack_long(struct task_struct *task, int offset)
47 stack = (unsigned char *)task_pt_regs(task);
49 return (*((int *)stack));
53 * This routine will put a word on the process kernel stack.
55 static inline int put_stack_long(struct task_struct *task, int offset,
60 stack = (unsigned char *)task_pt_regs(task);
62 *(unsigned long *) stack = data;
66 void ptrace_triggered(struct perf_event *bp, int nmi,
67 struct perf_sample_data *data, struct pt_regs *regs)
69 struct perf_event_attr attr;
72 * Disable the breakpoint request here since ptrace has defined a
73 * one-shot behaviour for breakpoint exceptions.
77 modify_user_hw_breakpoint(bp, &attr);
80 static int set_single_step(struct task_struct *tsk, unsigned long addr)
82 struct thread_struct *thread = &tsk->thread;
83 struct perf_event *bp;
84 struct perf_event_attr attr;
86 bp = thread->ptrace_bps[0];
88 ptrace_breakpoint_init(&attr);
91 attr.bp_len = HW_BREAKPOINT_LEN_2;
92 attr.bp_type = HW_BREAKPOINT_R;
94 bp = register_user_hw_breakpoint(&attr, ptrace_triggered, tsk);
98 thread->ptrace_bps[0] = bp;
104 err = modify_user_hw_breakpoint(bp, &attr);
112 void user_enable_single_step(struct task_struct *child)
114 unsigned long pc = get_stack_long(child, offsetof(struct pt_regs, pc));
116 set_tsk_thread_flag(child, TIF_SINGLESTEP);
118 set_single_step(child, pc);
121 void user_disable_single_step(struct task_struct *child)
123 clear_tsk_thread_flag(child, TIF_SINGLESTEP);
127 * Called by kernel/ptrace.c when detaching..
129 * Make sure single step bits etc are not set.
131 void ptrace_disable(struct task_struct *child)
133 user_disable_single_step(child);
136 static 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)
141 const struct pt_regs *regs = task_pt_regs(target);
144 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
146 0, 16 * sizeof(unsigned long));
148 /* PC, PR, SR, GBR, MACH, MACL, TRA */
149 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
151 offsetof(struct pt_regs, pc),
152 sizeof(struct pt_regs));
154 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
155 sizeof(struct pt_regs), -1);
160 static 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)
165 struct pt_regs *regs = task_pt_regs(target);
168 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
170 0, 16 * sizeof(unsigned long));
171 if (!ret && count > 0)
172 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
174 offsetof(struct pt_regs, pc),
175 sizeof(struct pt_regs));
177 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
178 sizeof(struct pt_regs), -1);
184 int 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)
191 ret = init_fpu(target);
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);
199 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
200 &target->thread.xstate->softfpu, 0, -1);
203 static 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)
210 ret = init_fpu(target);
214 set_stopped_child_used_math(target);
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);
220 return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
221 &target->thread.xstate->softfpu, 0, -1);
224 static int fpregs_active(struct task_struct *target,
225 const struct user_regset *regset)
227 return tsk_used_math(target) ? regset->n : 0;
232 static 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)
237 const struct pt_dspregs *regs =
238 (struct pt_dspregs *)&target->thread.dsp_status.dsp_regs;
241 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, regs,
242 0, sizeof(struct pt_dspregs));
244 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
245 sizeof(struct pt_dspregs), -1);
250 static 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)
255 struct pt_dspregs *regs =
256 (struct pt_dspregs *)&target->thread.dsp_status.dsp_regs;
259 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, regs,
260 0, sizeof(struct pt_dspregs));
262 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
263 sizeof(struct pt_dspregs), -1);
268 static int dspregs_active(struct task_struct *target,
269 const struct user_regset *regset)
271 struct pt_regs *regs = task_pt_regs(target);
273 return regs->sr & SR_DSP ? regset->n : 0;
277 const struct pt_regs_offset regoffset_table[] = {
288 REGS_OFFSET_NAME(10),
289 REGS_OFFSET_NAME(11),
290 REGS_OFFSET_NAME(12),
291 REGS_OFFSET_NAME(13),
292 REGS_OFFSET_NAME(14),
293 REGS_OFFSET_NAME(15),
297 REG_OFFSET_NAME(gbr),
298 REG_OFFSET_NAME(mach),
299 REG_OFFSET_NAME(macl),
300 REG_OFFSET_NAME(tra),
305 * These are our native regset flavours.
317 static const struct user_regset sh_regsets[] = {
321 * PC, PR, SR, GBR, MACH, MACL, TRA
324 .core_note_type = NT_PRSTATUS,
326 .size = sizeof(long),
327 .align = sizeof(long),
334 .core_note_type = NT_PRFPREG,
335 .n = sizeof(struct user_fpu_struct) / sizeof(long),
336 .size = sizeof(long),
337 .align = sizeof(long),
340 .active = fpregs_active,
346 .n = sizeof(struct pt_dspregs) / sizeof(long),
347 .size = sizeof(long),
348 .align = sizeof(long),
351 .active = dspregs_active,
356 static const struct user_regset_view user_sh_native_view = {
359 .regsets = sh_regsets,
360 .n = ARRAY_SIZE(sh_regsets),
363 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
365 return &user_sh_native_view;
368 long arch_ptrace(struct task_struct *child, long request, long addr, long data)
370 struct user * dummy = NULL;
371 unsigned long __user *datap = (unsigned long __user *)data;
375 /* read the word at location addr in the USER area. */
376 case PTRACE_PEEKUSR: {
380 if ((addr & 3) || addr < 0 ||
381 addr > sizeof(struct user) - 3)
384 if (addr < sizeof(struct pt_regs))
385 tmp = get_stack_long(child, addr);
386 else if (addr >= (long) &dummy->fpu &&
387 addr < (long) &dummy->u_fpvalid) {
388 if (!tsk_used_math(child)) {
389 if (addr == (long)&dummy->fpu.fpscr)
394 tmp = ((long *)child->thread.xstate)
395 [(addr - (long)&dummy->fpu) >> 2];
396 } else if (addr == (long) &dummy->u_fpvalid)
397 tmp = !!tsk_used_math(child);
398 else if (addr == PT_TEXT_ADDR)
399 tmp = child->mm->start_code;
400 else if (addr == PT_DATA_ADDR)
401 tmp = child->mm->start_data;
402 else if (addr == PT_TEXT_END_ADDR)
403 tmp = child->mm->end_code;
404 else if (addr == PT_TEXT_LEN)
405 tmp = child->mm->end_code - child->mm->start_code;
408 ret = put_user(tmp, datap);
412 case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
414 if ((addr & 3) || addr < 0 ||
415 addr > sizeof(struct user) - 3)
418 if (addr < sizeof(struct pt_regs))
419 ret = put_stack_long(child, addr, data);
420 else if (addr >= (long) &dummy->fpu &&
421 addr < (long) &dummy->u_fpvalid) {
422 set_stopped_child_used_math(child);
423 ((long *)child->thread.xstate)
424 [(addr - (long)&dummy->fpu) >> 2] = data;
426 } else if (addr == (long) &dummy->u_fpvalid) {
427 conditional_stopped_child_used_math(data, child);
433 return copy_regset_to_user(child, &user_sh_native_view,
435 0, sizeof(struct pt_regs),
436 (void __user *)data);
438 return copy_regset_from_user(child, &user_sh_native_view,
440 0, sizeof(struct pt_regs),
441 (const void __user *)data);
443 case PTRACE_GETFPREGS:
444 return copy_regset_to_user(child, &user_sh_native_view,
446 0, sizeof(struct user_fpu_struct),
447 (void __user *)data);
448 case PTRACE_SETFPREGS:
449 return copy_regset_from_user(child, &user_sh_native_view,
451 0, sizeof(struct user_fpu_struct),
452 (const void __user *)data);
455 case PTRACE_GETDSPREGS:
456 return copy_regset_to_user(child, &user_sh_native_view,
458 0, sizeof(struct pt_dspregs),
459 (void __user *)data);
460 case PTRACE_SETDSPREGS:
461 return copy_regset_from_user(child, &user_sh_native_view,
463 0, sizeof(struct pt_dspregs),
464 (const void __user *)data);
467 ret = ptrace_request(child, request, addr, data);
474 static inline int audit_arch(void)
478 #ifdef CONFIG_CPU_LITTLE_ENDIAN
479 arch |= __AUDIT_ARCH_LE;
485 asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
489 secure_computing(regs->regs[0]);
491 if (test_thread_flag(TIF_SYSCALL_TRACE) &&
492 tracehook_report_syscall_entry(regs))
494 * Tracing decided this syscall should not happen.
495 * We'll return a bogus call number to get an ENOSYS
496 * error, but leave the original number in regs->regs[0].
500 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
501 trace_sys_enter(regs, regs->regs[0]);
503 if (unlikely(current->audit_context))
504 audit_syscall_entry(audit_arch(), regs->regs[3],
505 regs->regs[4], regs->regs[5],
506 regs->regs[6], regs->regs[7]);
508 return ret ?: regs->regs[0];
511 asmlinkage void do_syscall_trace_leave(struct pt_regs *regs)
515 if (unlikely(current->audit_context))
516 audit_syscall_exit(AUDITSC_RESULT(regs->regs[0]),
519 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
520 trace_sys_exit(regs, regs->regs[0]);
522 step = test_thread_flag(TIF_SINGLESTEP);
523 if (step || test_thread_flag(TIF_SYSCALL_TRACE))
524 tracehook_report_syscall_exit(regs, step);