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
parse_maps_line(char * line)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
mapinfo_create(pid_t pid)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
mapinfo_destroy(mapinfo_t * mi)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.
mapinfo_find(mapinfo_t * mi,uintptr_t pc,uintptr_t * rel_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