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,
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,
99 thread->ptrace_bps[0] = bp;
105 /* reenable breakpoint */
106 attr.disabled = false;
107 err = modify_user_hw_breakpoint(bp, &attr);
115 void user_enable_single_step(struct task_struct *child)
117 unsigned long pc = get_stack_long(child, offsetof(struct pt_regs, pc));
119 set_tsk_thread_flag(child, TIF_SINGLESTEP);
121 if (ptrace_get_breakpoints(child) < 0)
124 set_single_step(child, pc);
125 ptrace_put_breakpoints(child);
128 void user_disable_single_step(struct task_struct *child)
130 clear_tsk_thread_flag(child, TIF_SINGLESTEP);
134 * Called by kernel/ptrace.c when detaching..
136 * Make sure single step bits etc are not set.
138 void ptrace_disable(struct task_struct *child)
140 user_disable_single_step(child);
143 static 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)
148 const struct pt_regs *regs = task_pt_regs(target);
151 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
153 0, 16 * sizeof(unsigned long));
155 /* PC, PR, SR, GBR, MACH, MACL, TRA */
156 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
158 offsetof(struct pt_regs, pc),
159 sizeof(struct pt_regs));
161 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
162 sizeof(struct pt_regs), -1);
167 static 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)
172 struct pt_regs *regs = task_pt_regs(target);
175 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
177 0, 16 * sizeof(unsigned long));
178 if (!ret && count > 0)
179 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
181 offsetof(struct pt_regs, pc),
182 sizeof(struct pt_regs));
184 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
185 sizeof(struct pt_regs), -1);
191 int 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)
198 ret = init_fpu(target);
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);
206 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
207 &target->thread.xstate->softfpu, 0, -1);
210 static 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)
217 ret = init_fpu(target);
221 set_stopped_child_used_math(target);
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);
227 return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
228 &target->thread.xstate->softfpu, 0, -1);
231 static int fpregs_active(struct task_struct *target,
232 const struct user_regset *regset)
234 return tsk_used_math(target) ? regset->n : 0;
239 static 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)
244 const struct pt_dspregs *regs =
245 (struct pt_dspregs *)&target->thread.dsp_status.dsp_regs;
248 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, regs,
249 0, sizeof(struct pt_dspregs));
251 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
252 sizeof(struct pt_dspregs), -1);
257 static 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)
262 struct pt_dspregs *regs =
263 (struct pt_dspregs *)&target->thread.dsp_status.dsp_regs;
266 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, regs,
267 0, sizeof(struct pt_dspregs));
269 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
270 sizeof(struct pt_dspregs), -1);
275 static int dspregs_active(struct task_struct *target,
276 const struct user_regset *regset)
278 struct pt_regs *regs = task_pt_regs(target);
280 return regs->sr & SR_DSP ? regset->n : 0;
284 const struct pt_regs_offset regoffset_table[] = {
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),
304 REG_OFFSET_NAME(gbr),
305 REG_OFFSET_NAME(mach),
306 REG_OFFSET_NAME(macl),
307 REG_OFFSET_NAME(tra),
312 * These are our native regset flavours.
324 static const struct user_regset sh_regsets[] = {
328 * PC, PR, SR, GBR, MACH, MACL, TRA
331 .core_note_type = NT_PRSTATUS,
333 .size = sizeof(long),
334 .align = sizeof(long),
341 .core_note_type = NT_PRFPREG,
342 .n = sizeof(struct user_fpu_struct) / sizeof(long),
343 .size = sizeof(long),
344 .align = sizeof(long),
347 .active = fpregs_active,
353 .n = sizeof(struct pt_dspregs) / sizeof(long),
354 .size = sizeof(long),
355 .align = sizeof(long),
358 .active = dspregs_active,
363 static const struct user_regset_view user_sh_native_view = {
366 .regsets = sh_regsets,
367 .n = ARRAY_SIZE(sh_regsets),
370 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
372 return &user_sh_native_view;
375 long arch_ptrace(struct task_struct *child, long request,
376 unsigned long addr, unsigned long data)
378 unsigned long __user *datap = (unsigned long __user *)data;
382 /* read the word at location addr in the USER area. */
383 case PTRACE_PEEKUSR: {
387 if ((addr & 3) || addr < 0 ||
388 addr > sizeof(struct user) - 3)
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))
402 ret = init_fpu(child);
405 index = addr - offsetof(struct user, fpu);
406 tmp = ((unsigned long *)child->thread.xstate)
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;
421 ret = put_user(tmp, datap);
425 case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
427 if ((addr & 3) || addr < 0 ||
428 addr > sizeof(struct user) - 3)
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)) {
436 ret = init_fpu(child);
439 index = addr - offsetof(struct user, fpu);
440 set_stopped_child_used_math(child);
441 ((unsigned long *)child->thread.xstate)
444 } else if (addr == offsetof(struct user, u_fpvalid)) {
445 conditional_stopped_child_used_math(data, child);
451 return copy_regset_to_user(child, &user_sh_native_view,
453 0, sizeof(struct pt_regs),
456 return copy_regset_from_user(child, &user_sh_native_view,
458 0, sizeof(struct pt_regs),
461 case PTRACE_GETFPREGS:
462 return copy_regset_to_user(child, &user_sh_native_view,
464 0, sizeof(struct user_fpu_struct),
466 case PTRACE_SETFPREGS:
467 return copy_regset_from_user(child, &user_sh_native_view,
469 0, sizeof(struct user_fpu_struct),
473 case PTRACE_GETDSPREGS:
474 return copy_regset_to_user(child, &user_sh_native_view,
476 0, sizeof(struct pt_dspregs),
478 case PTRACE_SETDSPREGS:
479 return copy_regset_from_user(child, &user_sh_native_view,
481 0, sizeof(struct pt_dspregs),
485 ret = ptrace_request(child, request, addr, data);
492 static inline int audit_arch(void)
496 #ifdef CONFIG_CPU_LITTLE_ENDIAN
497 arch |= __AUDIT_ARCH_LE;
503 asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
507 secure_computing(regs->regs[0]);
509 if (test_thread_flag(TIF_SYSCALL_TRACE) &&
510 tracehook_report_syscall_entry(regs))
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].
518 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
519 trace_sys_enter(regs, regs->regs[0]);
521 audit_syscall_entry(audit_arch(), regs->regs[3],
522 regs->regs[4], regs->regs[5],
523 regs->regs[6], regs->regs[7]);
525 return ret ?: regs->regs[0];
528 asmlinkage void do_syscall_trace_leave(struct pt_regs *regs)
532 audit_syscall_exit(regs);
534 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
535 trace_sys_exit(regs, regs->regs[0]);
537 step = test_thread_flag(TIF_SINGLESTEP);
538 if (step || test_thread_flag(TIF_SYSCALL_TRACE))
539 tracehook_report_syscall_exit(regs, step);