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 <stdio.h>
30 #include <stdlib.h>
31 #include <unistd.h>
32 #include <ctype.h>
33 #include <signal.h>
34 #include <sys/mman.h>
35
36 #include "linker.h"
37
38 #include <sys/socket.h>
39 #include <cutils/sockets.h>
40
41 void notify_gdb_of_libraries();
42
debugger_signal_handler(int n)43 void debugger_signal_handler(int n)
44 {
45 unsigned tid;
46 int s;
47
48 /* avoid picking up GC interrupts */
49 signal(SIGUSR1, SIG_IGN);
50
51 tid = gettid();
52 s = socket_local_client("android:debuggerd",
53 ANDROID_SOCKET_NAMESPACE_ABSTRACT, SOCK_STREAM);
54
55 if(s >= 0) {
56 /* debugger knows our pid from the credentials on the
57 * local socket but we need to tell it our tid. It
58 * is paranoid and will verify that we are giving a tid
59 * that's actually in our process
60 */
61 write(s, &tid, sizeof(unsigned));
62
63 read(s, &tid, 1);
64 notify_gdb_of_libraries();
65 close(s);
66 }
67
68 /* remove our net so we fault for real when we return */
69 signal(n, SIG_IGN);
70 }
71
debugger_init()72 void debugger_init()
73 {
74 signal(SIGILL, debugger_signal_handler);
75 signal(SIGABRT, debugger_signal_handler);
76 signal(SIGBUS, debugger_signal_handler);
77 signal(SIGFPE, debugger_signal_handler);
78 signal(SIGSEGV, debugger_signal_handler);
79 signal(SIGSTKFLT, debugger_signal_handler);
80 signal(SIGPIPE, debugger_signal_handler);
81 }
82