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 "malloc_debug_check_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* 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* mi = static_cast<mapinfo*>(dlmalloc(sizeof(mapinfo) + (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 /* To be filled in parse_elf_info if the mapped section starts with
55 * elf_header
56 */
57 mi->next = 0;
58 strcpy(mi->name, line + 49);
59
60 return mi;
61 }
62
63 __LIBC_HIDDEN__
init_mapinfo(int pid)64 mapinfo *init_mapinfo(int pid) {
65 struct mapinfo *milist = NULL;
66 char data[1024]; // Used to read lines as well as to construct the filename.
67 snprintf(data, sizeof(data), "/proc/%d/maps", pid);
68 FILE *fp = fopen(data, "r");
69 if (fp) {
70 while (fgets(data, sizeof(data), fp)) {
71 mapinfo *mi = parse_maps_line(data);
72 if (mi) {
73 mi->next = milist;
74 milist = mi;
75 }
76 }
77 fclose(fp);
78 }
79
80 return milist;
81 }
82
83 __LIBC_HIDDEN__
deinit_mapinfo(mapinfo * mi)84 void deinit_mapinfo(mapinfo *mi) {
85 mapinfo *del;
86 while (mi) {
87 del = mi;
88 mi = mi->next;
89 dlfree(del);
90 }
91 }
92
93 /* Map a pc address to the name of the containing ELF file */
94 __LIBC_HIDDEN__
map_to_name(mapinfo * mi,unsigned pc,const char * def)95 const char *map_to_name(mapinfo *mi, unsigned pc, const char* def) {
96 while (mi) {
97 if ((pc >= mi->start) && (pc < mi->end)) {
98 return mi->name;
99 }
100 mi = mi->next;
101 }
102 return def;
103 }
104
105 /* Find the containing map info for the pc */
106 __LIBC_HIDDEN__
pc_to_mapinfo(mapinfo * mi,unsigned pc,unsigned * rel_pc)107 const mapinfo *pc_to_mapinfo(mapinfo *mi, unsigned pc, unsigned *rel_pc) {
108 *rel_pc = pc;
109 while (mi) {
110 if ((pc >= mi->start) && (pc < mi->end)) {
111 // Only calculate the relative offset for shared libraries
112 if (strstr(mi->name, ".so")) {
113 *rel_pc -= mi->start;
114 }
115 return mi;
116 }
117 mi = mi->next;
118 }
119 return NULL;
120 }
121