ptrace.cpp revision c3f114037dbf028896310609fd28cf2b3da99c4d 
1/*
2 * Copyright (C) 2008 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *  * Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 *  * Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in
12 *    the documentation and/or other materials provided with the
13 *    distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <sys/types.h>
30#include <sys/ptrace.h>
31
32extern "C" long __ptrace(int request, pid_t pid, void* addr, void* data);
33
34long ptrace(int request, pid_t pid, void* addr, void* data) {
35  switch (request) {
36    case PTRACE_PEEKUSR:
37    case PTRACE_PEEKTEXT:
38    case PTRACE_PEEKDATA:
39      {
40      long word;
41      long ret = __ptrace(request, pid, addr, &word);
42      if (ret == 0) {
43        return word;
44      } else {
45        // __ptrace already set errno for us.
46        return -1;
47      }
48    }
49
50    default:
51      return __ptrace(request, pid, addr, data);
52  }
53}
54
55/*
56 * Hook for gdb to get notified when a thread is created
57 */
58#ifdef __i386__
59#define ATTRIBUTES __attribute__((noinline)) __attribute__((fastcall))
60#else
61#define ATTRIBUTES __attribute__((noinline))
62#endif
63
64extern "C" void _thread_created_hook(pid_t) ATTRIBUTES;
65
66void _thread_created_hook(pid_t) {
67}
68