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/*
* 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 <cutils/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;
}
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