diff options
Diffstat (limited to 'libbacktrace')
| -rw-r--r-- | libbacktrace/map_info.c | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/libbacktrace/map_info.c b/libbacktrace/map_info.c new file mode 100644 index 0000000..073b24a --- /dev/null +++ b/libbacktrace/map_info.c @@ -0,0 +1,173 @@ +/* + * Copyright (C) 2013 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#include <ctype.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <limits.h> +#include <pthread.h> +#include <unistd.h> +#include <log/log.h> +#include <sys/time.h> + +#include <backtrace/backtrace.h> + +#if defined(__APPLE__) + +// Mac OS vmmap(1) output: +// __TEXT 0009f000-000a1000 [ 8K 8K] r-x/rwx SM=COW /Volumes/android/dalvik-dev/out/host/darwin-x86/bin/libcorkscrew_test\n +// 012345678901234567890123456789012345678901234567890123456789 +// 0 1 2 3 4 5 +static backtrace_map_info_t* parse_vmmap_line(const char* line) { + unsigned long int start; + unsigned long int end; + char permissions[4]; + int name_pos; + if (sscanf(line, "%*21c %lx-%lx [%*13c] %3c/%*3c SM=%*3c %n", + &start, &end, permissions, &name_pos) != 3) { + return NULL; + } + + const char* name = line + name_pos; + size_t name_len = strlen(name); + + backtrace_map_info_t* mi = calloc(1, sizeof(backtrace_map_info_t) + name_len); + if (mi != NULL) { + mi->start = start; + mi->end = end; + mi->is_readable = permissions[0] == 'r'; + mi->is_writable = permissions[1] == 'w'; + mi->is_executable = permissions[2] == 'x'; + memcpy(mi->name, name, name_len); + mi->name[name_len - 1] = '\0'; + ALOGV("Parsed map: start=0x%08x, end=0x%08x, " + "is_readable=%d, is_writable=%d is_executable=%d, name=%s", + mi->start, mi->end, + mi->is_readable, mi->is_writable, mi->is_executable, mi->name); + } + return mi; +} + +backtrace_map_info_t* backtrace_create_map_info_list(pid_t pid) { + char cmd[1024]; + if (pid < 0) { + pid = getpid(); + } + snprintf(cmd, sizeof(cmd), "vmmap -w -resident -submap -allSplitLibs -interleaved %d", pid); + FILE* fp = popen(cmd, "r"); + if (fp == NULL) { + return NULL; + } + + char line[1024]; + backtrace_map_info_t* milist = NULL; + while (fgets(line, sizeof(line), fp) != NULL) { + backtrace_map_info_t* mi = parse_vmmap_line(line); + if (mi != NULL) { + mi->next = milist; + milist = mi; + } + } + pclose(fp); + return milist; +} + +#else + +// Linux /proc/<pid>/maps lines: +// 6f000000-6f01e000 rwxp 00000000 00:0c 16389419 /system/lib/libcomposer.so\n +// 012345678901234567890123456789012345678901234567890123456789 +// 0 1 2 3 4 5 +static backtrace_map_info_t* parse_maps_line(const char* line) +{ + unsigned long int start; + unsigned long int end; + char permissions[5]; + int name_pos; + if (sscanf(line, "%lx-%lx %4s %*x %*x:%*x %*d%n", &start, &end, + permissions, &name_pos) != 3) { + return NULL; + } + + while (isspace(line[name_pos])) { + name_pos += 1; + } + const char* name = line + name_pos; + size_t name_len = strlen(name); + if (name_len && name[name_len - 1] == '\n') { + name_len -= 1; + } + + backtrace_map_info_t* mi = calloc(1, sizeof(backtrace_map_info_t) + name_len + 1); + if (mi) { + mi->start = start; + mi->end = end; + mi->is_readable = strlen(permissions) == 4 && permissions[0] == 'r'; + mi->is_writable = strlen(permissions) == 4 && permissions[1] == 'w'; + mi->is_executable = strlen(permissions) == 4 && permissions[2] == 'x'; + memcpy(mi->name, name, name_len); + mi->name[name_len] = '\0'; + ALOGV("Parsed map: start=0x%08x, end=0x%08x, " + "is_readable=%d, is_writable=%d, is_executable=%d, name=%s", + mi->start, mi->end, + mi->is_readable, mi->is_writable, mi->is_executable, mi->name); + } + return mi; +} + +backtrace_map_info_t* backtrace_create_map_info_list(pid_t tid) { + char path[PATH_MAX]; + char line[1024]; + FILE* fp; + backtrace_map_info_t* milist = NULL; + + if (tid < 0) { + tid = getpid(); + } + snprintf(path, PATH_MAX, "/proc/%d/maps", tid); + fp = fopen(path, "r"); + if (fp) { + while(fgets(line, sizeof(line), fp)) { + backtrace_map_info_t* mi = parse_maps_line(line); + if (mi) { + mi->next = milist; + milist = mi; + } + } + fclose(fp); + } + return milist; +} + +#endif + +void backtrace_destroy_map_info_list(backtrace_map_info_t* milist) { + while (milist) { + backtrace_map_info_t* next = milist->next; + free(milist); + milist = next; + } +} + +const backtrace_map_info_t* backtrace_find_map_info( + const backtrace_map_info_t* milist, uintptr_t addr) { + const backtrace_map_info_t* mi = milist; + while (mi && !(addr >= mi->start && addr < mi->end)) { + mi = mi->next; + } + return mi; +} |