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      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 #include <sys/types.h>
     29 #include <sys/ptrace.h>
     30 
     31 extern long __ptrace(int request, pid_t pid, void *addr, void *data);
     32 
     33 long ptrace(int request, pid_t pid, void * addr, void * data)
     34 {
     35     switch (request) {
     36         case PTRACE_PEEKUSR:
     37         case PTRACE_PEEKTEXT:
     38         case PTRACE_PEEKDATA:
     39         {
     40             long word;
     41             long ret;
     42 
     43             ret = __ptrace(request, pid, addr, &word);
     44             if (ret == 0) {
     45                 return word;
     46             } else {
     47                 // __ptrace will set errno for us
     48                 return -1;
     49             }
     50         }
     51 
     52         default:
     53              return __ptrace(request, pid, addr, data);
     54     }
     55 }
     56 
     57 /*
     58  * Hook for gdb to get notified when a thread is created
     59  */
     60 void _thread_created_hook(pid_t thread_id) __attribute__((noinline));
     61 void _thread_created_hook(pid_t thread_id)
     62 {
     63 }
     64