Christopher Ferris | 7fb2287 | 2013-09-27 12:43:15 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2013 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #include <ctype.h> |
| 18 | #include <stdio.h> |
| 19 | #include <stdlib.h> |
| 20 | #include <string.h> |
| 21 | #include <limits.h> |
| 22 | #include <pthread.h> |
| 23 | #include <unistd.h> |
Christopher Ferris | 6d22960 | 2013-10-01 23:46:23 -0700 | [diff] [blame] | 24 | #include <log/log.h> |
Christopher Ferris | 7fb2287 | 2013-09-27 12:43:15 -0700 | [diff] [blame] | 25 | #include <sys/time.h> |
| 26 | |
| 27 | #include <backtrace/backtrace.h> |
| 28 | |
| 29 | #if defined(__APPLE__) |
| 30 | |
| 31 | // Mac OS vmmap(1) output: |
| 32 | // __TEXT 0009f000-000a1000 [ 8K 8K] r-x/rwx SM=COW /Volumes/android/dalvik-dev/out/host/darwin-x86/bin/libcorkscrew_test\n |
| 33 | // 012345678901234567890123456789012345678901234567890123456789 |
| 34 | // 0 1 2 3 4 5 |
| 35 | static backtrace_map_info_t* parse_vmmap_line(const char* line) { |
| 36 | unsigned long int start; |
| 37 | unsigned long int end; |
| 38 | char permissions[4]; |
| 39 | int name_pos; |
| 40 | if (sscanf(line, "%*21c %lx-%lx [%*13c] %3c/%*3c SM=%*3c %n", |
| 41 | &start, &end, permissions, &name_pos) != 3) { |
| 42 | return NULL; |
| 43 | } |
| 44 | |
| 45 | const char* name = line + name_pos; |
| 46 | size_t name_len = strlen(name); |
| 47 | |
| 48 | backtrace_map_info_t* mi = calloc(1, sizeof(backtrace_map_info_t) + name_len); |
| 49 | if (mi != NULL) { |
| 50 | mi->start = start; |
| 51 | mi->end = end; |
| 52 | mi->is_readable = permissions[0] == 'r'; |
| 53 | mi->is_writable = permissions[1] == 'w'; |
| 54 | mi->is_executable = permissions[2] == 'x'; |
| 55 | memcpy(mi->name, name, name_len); |
| 56 | mi->name[name_len - 1] = '\0'; |
| 57 | ALOGV("Parsed map: start=0x%08x, end=0x%08x, " |
| 58 | "is_readable=%d, is_writable=%d is_executable=%d, name=%s", |
| 59 | mi->start, mi->end, |
| 60 | mi->is_readable, mi->is_writable, mi->is_executable, mi->name); |
| 61 | } |
| 62 | return mi; |
| 63 | } |
| 64 | |
| 65 | backtrace_map_info_t* backtrace_create_map_info_list(pid_t pid) { |
| 66 | char cmd[1024]; |
| 67 | if (pid < 0) { |
| 68 | pid = getpid(); |
| 69 | } |
| 70 | snprintf(cmd, sizeof(cmd), "vmmap -w -resident -submap -allSplitLibs -interleaved %d", pid); |
| 71 | FILE* fp = popen(cmd, "r"); |
| 72 | if (fp == NULL) { |
| 73 | return NULL; |
| 74 | } |
| 75 | |
| 76 | char line[1024]; |
| 77 | backtrace_map_info_t* milist = NULL; |
| 78 | while (fgets(line, sizeof(line), fp) != NULL) { |
| 79 | backtrace_map_info_t* mi = parse_vmmap_line(line); |
| 80 | if (mi != NULL) { |
| 81 | mi->next = milist; |
| 82 | milist = mi; |
| 83 | } |
| 84 | } |
| 85 | pclose(fp); |
| 86 | return milist; |
| 87 | } |
| 88 | |
| 89 | #else |
| 90 | |
| 91 | // Linux /proc/<pid>/maps lines: |
| 92 | // 6f000000-6f01e000 rwxp 00000000 00:0c 16389419 /system/lib/libcomposer.so\n |
| 93 | // 012345678901234567890123456789012345678901234567890123456789 |
| 94 | // 0 1 2 3 4 5 |
| 95 | static backtrace_map_info_t* parse_maps_line(const char* line) |
| 96 | { |
| 97 | unsigned long int start; |
| 98 | unsigned long int end; |
| 99 | char permissions[5]; |
| 100 | int name_pos; |
| 101 | if (sscanf(line, "%lx-%lx %4s %*x %*x:%*x %*d%n", &start, &end, |
| 102 | permissions, &name_pos) != 3) { |
| 103 | return NULL; |
| 104 | } |
| 105 | |
| 106 | while (isspace(line[name_pos])) { |
| 107 | name_pos += 1; |
| 108 | } |
| 109 | const char* name = line + name_pos; |
| 110 | size_t name_len = strlen(name); |
| 111 | if (name_len && name[name_len - 1] == '\n') { |
| 112 | name_len -= 1; |
| 113 | } |
| 114 | |
| 115 | backtrace_map_info_t* mi = calloc(1, sizeof(backtrace_map_info_t) + name_len + 1); |
| 116 | if (mi) { |
| 117 | mi->start = start; |
| 118 | mi->end = end; |
| 119 | mi->is_readable = strlen(permissions) == 4 && permissions[0] == 'r'; |
| 120 | mi->is_writable = strlen(permissions) == 4 && permissions[1] == 'w'; |
| 121 | mi->is_executable = strlen(permissions) == 4 && permissions[2] == 'x'; |
| 122 | memcpy(mi->name, name, name_len); |
| 123 | mi->name[name_len] = '\0'; |
| 124 | ALOGV("Parsed map: start=0x%08x, end=0x%08x, " |
| 125 | "is_readable=%d, is_writable=%d, is_executable=%d, name=%s", |
| 126 | mi->start, mi->end, |
| 127 | mi->is_readable, mi->is_writable, mi->is_executable, mi->name); |
| 128 | } |
| 129 | return mi; |
| 130 | } |
| 131 | |
| 132 | backtrace_map_info_t* backtrace_create_map_info_list(pid_t tid) { |
| 133 | char path[PATH_MAX]; |
| 134 | char line[1024]; |
| 135 | FILE* fp; |
| 136 | backtrace_map_info_t* milist = NULL; |
| 137 | |
| 138 | if (tid < 0) { |
| 139 | tid = getpid(); |
| 140 | } |
| 141 | snprintf(path, PATH_MAX, "/proc/%d/maps", tid); |
| 142 | fp = fopen(path, "r"); |
| 143 | if (fp) { |
| 144 | while(fgets(line, sizeof(line), fp)) { |
| 145 | backtrace_map_info_t* mi = parse_maps_line(line); |
| 146 | if (mi) { |
| 147 | mi->next = milist; |
| 148 | milist = mi; |
| 149 | } |
| 150 | } |
| 151 | fclose(fp); |
| 152 | } |
| 153 | return milist; |
| 154 | } |
| 155 | |
| 156 | #endif |
| 157 | |
| 158 | void backtrace_destroy_map_info_list(backtrace_map_info_t* milist) { |
| 159 | while (milist) { |
| 160 | backtrace_map_info_t* next = milist->next; |
| 161 | free(milist); |
| 162 | milist = next; |
| 163 | } |
| 164 | } |
| 165 | |
| 166 | const backtrace_map_info_t* backtrace_find_map_info( |
| 167 | const backtrace_map_info_t* milist, uintptr_t addr) { |
| 168 | const backtrace_map_info_t* mi = milist; |
| 169 | while (mi && !(addr >= mi->start && addr < mi->end)) { |
| 170 | mi = mi->next; |
| 171 | } |
| 172 | return mi; |
| 173 | } |