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>
15 #include <linux/sched/task_stack.h>
17 #include <linux/smp.h>
18 #include <linux/errno.h>
19 #include <linux/ptrace.h>
20 #include <linux/user.h>
21 #include <linux/security.h>
22 #include <linux/signal.h>
24 #include <linux/audit.h>
25 #include <linux/seccomp.h>
26 #include <linux/tracehook.h>
27 #include <linux/elf.h>
28 #include <linux/regset.h>
29 #include <linux/hw_breakpoint.h>
30 #include <linux/uaccess.h>
31 #include <asm/pgtable.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 set_single_step(child, pc);
124 void user_disable_single_step(struct task_struct *child)
126 clear_tsk_thread_flag(child, TIF_SINGLESTEP);
130 * Called by kernel/ptrace.c when detaching..
132 * Make sure single step bits etc are not set.
134 void ptrace_disable(struct task_struct *child)
136 user_disable_single_step(child);
139 static int genregs_get(struct task_struct *target,
140 const struct user_regset *regset,
141 unsigned int pos, unsigned int count,
142 void *kbuf, void __user *ubuf)
144 const struct pt_regs *regs = task_pt_regs(target);
147 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
149 0, 16 * sizeof(unsigned long));
151 /* PC, PR, SR, GBR, MACH, MACL, TRA */
152 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
154 offsetof(struct pt_regs, pc),
155 sizeof(struct pt_regs));
157 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
158 sizeof(struct pt_regs), -1);
163 static int genregs_set(struct task_struct *target,
164 const struct user_regset *regset,
165 unsigned int pos, unsigned int count,
166 const void *kbuf, const void __user *ubuf)
168 struct pt_regs *regs = task_pt_regs(target);
171 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
173 0, 16 * sizeof(unsigned long));
174 if (!ret && count > 0)
175 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
177 offsetof(struct pt_regs, pc),
178 sizeof(struct pt_regs));
180 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
181 sizeof(struct pt_regs), -1);
187 int fpregs_get(struct task_struct *target,
188 const struct user_regset *regset,
189 unsigned int pos, unsigned int count,
190 void *kbuf, void __user *ubuf)
194 ret = init_fpu(target);
198 if ((boot_cpu_data.flags & CPU_HAS_FPU))
199 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
200 &target->thread.xstate->hardfpu, 0, -1);
202 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
203 &target->thread.xstate->softfpu, 0, -1);
206 static int fpregs_set(struct task_struct *target,
207 const struct user_regset *regset,
208 unsigned int pos, unsigned int count,
209 const void *kbuf, const void __user *ubuf)
213 ret = init_fpu(target);
217 set_stopped_child_used_math(target);
219 if ((boot_cpu_data.flags & CPU_HAS_FPU))
220 return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
221 &target->thread.xstate->hardfpu, 0, -1);
223 return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
224 &target->thread.xstate->softfpu, 0, -1);
227 static int fpregs_active(struct task_struct *target,
228 const struct user_regset *regset)
230 return tsk_used_math(target) ? regset->n : 0;
235 static int dspregs_get(struct task_struct *target,
236 const struct user_regset *regset,
237 unsigned int pos, unsigned int count,
238 void *kbuf, void __user *ubuf)
240 const struct pt_dspregs *regs =
241 (struct pt_dspregs *)&target->thread.dsp_status.dsp_regs;
244 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, regs,
245 0, sizeof(struct pt_dspregs));
247 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
248 sizeof(struct pt_dspregs), -1);
253 static int dspregs_set(struct task_struct *target,
254 const struct user_regset *regset,
255 unsigned int pos, unsigned int count,
256 const void *kbuf, const void __user *ubuf)
258 struct pt_dspregs *regs =
259 (struct pt_dspregs *)&target->thread.dsp_status.dsp_regs;
262 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, regs,
263 0, sizeof(struct pt_dspregs));
265 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
266 sizeof(struct pt_dspregs), -1);
271 static int dspregs_active(struct task_struct *target,
272 const struct user_regset *regset)
274 struct pt_regs *regs = task_pt_regs(target);
276 return regs->sr & SR_DSP ? regset->n : 0;
280 const struct pt_regs_offset regoffset_table[] = {
291 REGS_OFFSET_NAME(10),
292 REGS_OFFSET_NAME(11),
293 REGS_OFFSET_NAME(12),
294 REGS_OFFSET_NAME(13),
295 REGS_OFFSET_NAME(14),
296 REGS_OFFSET_NAME(15),
300 REG_OFFSET_NAME(gbr),
301 REG_OFFSET_NAME(mach),
302 REG_OFFSET_NAME(macl),
303 REG_OFFSET_NAME(tra),
308 * These are our native regset flavours.
320 static const struct user_regset sh_regsets[] = {
324 * PC, PR, SR, GBR, MACH, MACL, TRA
327 .core_note_type = NT_PRSTATUS,
329 .size = sizeof(long),
330 .align = sizeof(long),
337 .core_note_type = NT_PRFPREG,
338 .n = sizeof(struct user_fpu_struct) / sizeof(long),
339 .size = sizeof(long),
340 .align = sizeof(long),
343 .active = fpregs_active,
349 .n = sizeof(struct pt_dspregs) / sizeof(long),
350 .size = sizeof(long),
351 .align = sizeof(long),
354 .active = dspregs_active,
359 static const struct user_regset_view user_sh_native_view = {
362 .regsets = sh_regsets,
363 .n = ARRAY_SIZE(sh_regsets),
366 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
368 return &user_sh_native_view;
371 long arch_ptrace(struct task_struct *child, long request,
372 unsigned long addr, unsigned long data)
374 unsigned long __user *datap = (unsigned long __user *)data;
378 /* read the word at location addr in the USER area. */
379 case PTRACE_PEEKUSR: {
383 if ((addr & 3) || addr < 0 ||
384 addr > sizeof(struct user) - 3)
387 if (addr < sizeof(struct pt_regs))
388 tmp = get_stack_long(child, addr);
389 else if (addr >= offsetof(struct user, fpu) &&
390 addr < offsetof(struct user, u_fpvalid)) {
391 if (!tsk_used_math(child)) {
392 if (addr == offsetof(struct user, fpu.fpscr))
398 ret = init_fpu(child);
401 index = addr - offsetof(struct user, fpu);
402 tmp = ((unsigned long *)child->thread.xstate)
405 } else if (addr == offsetof(struct user, u_fpvalid))
406 tmp = !!tsk_used_math(child);
407 else if (addr == PT_TEXT_ADDR)
408 tmp = child->mm->start_code;
409 else if (addr == PT_DATA_ADDR)
410 tmp = child->mm->start_data;
411 else if (addr == PT_TEXT_END_ADDR)
412 tmp = child->mm->end_code;
413 else if (addr == PT_TEXT_LEN)
414 tmp = child->mm->end_code - child->mm->start_code;
417 ret = put_user(tmp, datap);
421 case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
423 if ((addr & 3) || addr < 0 ||
424 addr > sizeof(struct user) - 3)
427 if (addr < sizeof(struct pt_regs))
428 ret = put_stack_long(child, addr, data);
429 else if (addr >= offsetof(struct user, fpu) &&
430 addr < offsetof(struct user, u_fpvalid)) {
432 ret = init_fpu(child);
435 index = addr - offsetof(struct user, fpu);
436 set_stopped_child_used_math(child);
437 ((unsigned long *)child->thread.xstate)
440 } else if (addr == offsetof(struct user, u_fpvalid)) {
441 conditional_stopped_child_used_math(data, child);
447 return copy_regset_to_user(child, &user_sh_native_view,
449 0, sizeof(struct pt_regs),
452 return copy_regset_from_user(child, &user_sh_native_view,
454 0, sizeof(struct pt_regs),
457 case PTRACE_GETFPREGS:
458 return copy_regset_to_user(child, &user_sh_native_view,
460 0, sizeof(struct user_fpu_struct),
462 case PTRACE_SETFPREGS:
463 return copy_regset_from_user(child, &user_sh_native_view,
465 0, sizeof(struct user_fpu_struct),
469 case PTRACE_GETDSPREGS:
470 return copy_regset_to_user(child, &user_sh_native_view,
472 0, sizeof(struct pt_dspregs),
474 case PTRACE_SETDSPREGS:
475 return copy_regset_from_user(child, &user_sh_native_view,
477 0, sizeof(struct pt_dspregs),
481 ret = ptrace_request(child, request, addr, data);
488 asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
492 secure_computing_strict(regs->regs[0]);
494 if (test_thread_flag(TIF_SYSCALL_TRACE) &&
495 tracehook_report_syscall_entry(regs))
497 * Tracing decided this syscall should not happen.
498 * We'll return a bogus call number to get an ENOSYS
499 * error, but leave the original number in regs->regs[0].
503 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
504 trace_sys_enter(regs, regs->regs[0]);
506 audit_syscall_entry(regs->regs[3], regs->regs[4], regs->regs[5],
507 regs->regs[6], regs->regs[7]);
509 return ret ?: regs->regs[0];
512 asmlinkage void do_syscall_trace_leave(struct pt_regs *regs)
516 audit_syscall_exit(regs);
518 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
519 trace_sys_exit(regs, regs->regs[0]);
521 step = test_thread_flag(TIF_SINGLESTEP);
522 if (step || test_thread_flag(TIF_SYSCALL_TRACE))
523 tracehook_report_syscall_exit(regs, step);