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      1 /*
      2  * Copyright (C) 2012 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 <string.h>
     31 #include <stdlib.h>
     32 
     33 #include "dlmalloc.h"
     34 #include "debug_mapinfo.h"
     35 
     36 // 6f000000-6f01e000 rwxp 00000000 00:0c 16389419   /system/lib/libcomposer.so
     37 // 012345678901234567890123456789012345678901234567890123456789
     38 // 0         1         2         3         4         5
     39 
     40 static mapinfo_t* parse_maps_line(char* line) {
     41   int len = strlen(line);
     42 
     43   if (len < 1) return 0;
     44   line[--len] = 0;
     45 
     46   if (len < 50) return 0;
     47   if (line[20] != 'x') return 0;
     48 
     49   mapinfo_t* mi = static_cast<mapinfo_t*>(dlmalloc(sizeof(mapinfo_t) + (len - 47)));
     50   if (mi == 0) return 0;
     51 
     52   mi->start = strtoul(line, 0, 16);
     53   mi->end = strtoul(line + 9, 0, 16);
     54   mi->next = 0;
     55   strcpy(mi->name, line + 49);
     56 
     57   return mi;
     58 }
     59 
     60 __LIBC_HIDDEN__ mapinfo_t* mapinfo_create(pid_t pid) {
     61   struct mapinfo_t* milist = NULL;
     62   char data[1024]; // Used to read lines as well as to construct the filename.
     63   snprintf(data, sizeof(data), "/proc/%d/maps", pid);
     64   FILE* fp = fopen(data, "r");
     65   if (fp != NULL) {
     66     while (fgets(data, sizeof(data), fp) != NULL) {
     67       mapinfo_t* mi = parse_maps_line(data);
     68       if (mi) {
     69         mi->next = milist;
     70         milist = mi;
     71       }
     72     }
     73     fclose(fp);
     74   }
     75   return milist;
     76 }
     77 
     78 __LIBC_HIDDEN__ void mapinfo_destroy(mapinfo_t* mi) {
     79   while (mi != NULL) {
     80     mapinfo_t* del = mi;
     81     mi = mi->next;
     82     dlfree(del);
     83   }
     84 }
     85 
     86 // Find the containing map info for the PC.
     87 __LIBC_HIDDEN__ const mapinfo_t* mapinfo_find(mapinfo_t* mi, uintptr_t pc, uintptr_t* rel_pc) {
     88   for (; mi != NULL; mi = mi->next) {
     89     if ((pc >= mi->start) && (pc < mi->end)) {
     90       *rel_pc = pc - mi->start;
     91       return mi;
     92     }
     93   }
     94   *rel_pc = pc;
     95   return NULL;
     96 }
     97