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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.
*/
#define LOG_TAG "libbacktrace"
#include <sys/ptrace.h>
#include <string.h>
#include <cutils/log.h>
#include <backtrace/backtrace.h>
#include <libunwind.h>
#include <libunwind-ptrace.h>
#include "common.h"
#include "demangle.h"
typedef struct {
unw_addr_space_t addr_space;
struct UPT_info* upt_info;
} backtrace_private_t;
static bool remote_get_frames(backtrace_t* backtrace) {
backtrace_private_t* data = (backtrace_private_t*)backtrace->private_data;
unw_cursor_t cursor;
int ret = unw_init_remote(&cursor, data->addr_space, data->upt_info);
if (ret < 0) {
ALOGW("remote_get_frames: unw_init_remote failed %d\n", ret);
return false;
}
backtrace_frame_data_t* frame;
bool returnValue = true;
backtrace->num_frames = 0;
uintptr_t map_start;
unw_word_t value;
do {
frame = &backtrace->frames[backtrace->num_frames];
frame->stack_size = 0;
frame->map_name = NULL;
frame->map_offset = 0;
frame->proc_name = NULL;
frame->proc_offset = 0;
ret = unw_get_reg(&cursor, UNW_REG_IP, &value);
if (ret < 0) {
ALOGW("remote_get_frames: Failed to read IP %d\n", ret);
returnValue = false;
break;
}
frame->pc = (uintptr_t)value;
ret = unw_get_reg(&cursor, UNW_REG_SP, &value);
if (ret < 0) {
ALOGW("remote_get_frames: Failed to read SP %d\n", ret);
returnValue = false;
break;
}
frame->sp = (uintptr_t)value;
if (backtrace->num_frames) {
backtrace_frame_data_t* prev = &backtrace->frames[backtrace->num_frames-1];
prev->stack_size = frame->sp - prev->sp;
}
frame->proc_name = backtrace_get_proc_name(backtrace, frame->pc, &frame->proc_offset);
frame->map_name = backtrace_get_map_info(backtrace, frame->pc, &map_start);
if (frame->map_name) {
frame->map_offset = frame->pc - map_start;
}
backtrace->num_frames++;
ret = unw_step (&cursor);
} while (ret > 0 && backtrace->num_frames < MAX_BACKTRACE_FRAMES);
return returnValue;
}
bool remote_get_data(backtrace_t* backtrace) {
backtrace_private_t* data = (backtrace_private_t*)malloc(sizeof(backtrace_private_t));
if (!data) {
ALOGW("remote_get_data: Failed to allocate memory.\n");
backtrace_free_data(backtrace);
return false;
}
data->addr_space = NULL;
data->upt_info = NULL;
backtrace->private_data = data;
data->addr_space = unw_create_addr_space(&_UPT_accessors, 0);
if (!data->addr_space) {
ALOGW("remote_get_data: Failed to create unw address space.\n");
backtrace_free_data(backtrace);
return false;
}
data->upt_info = _UPT_create(backtrace->tid);
if (!data->upt_info) {
ALOGW("remote_get_data: Failed to create upt info.\n");
backtrace_free_data(backtrace);
return false;
}
if (!remote_get_frames(backtrace)) {
backtrace_free_data(backtrace);
return false;
}
return true;
}
void remote_free_data(backtrace_t* backtrace) {
if (backtrace->private_data) {
backtrace_private_t* data = (backtrace_private_t*)backtrace->private_data;
if (data->upt_info) {
_UPT_destroy(data->upt_info);
data->upt_info = NULL;
}
if (data->addr_space) {
unw_destroy_addr_space(data->addr_space);
}
free(backtrace->private_data);
backtrace->private_data = NULL;
}
}
char* remote_get_proc_name(const backtrace_t* backtrace, uintptr_t pc,
uintptr_t* offset) {
backtrace_private_t* data = (backtrace_private_t*)backtrace->private_data;
char buf[512];
*offset = 0;
unw_word_t value;
if (unw_get_proc_name_by_ip(data->addr_space, pc, buf, sizeof(buf), &value,
data->upt_info) >= 0 && buf[0] != '\0') {
*offset = (uintptr_t)value;
char* symbol = demangle_symbol_name(buf);
if (!symbol) {
symbol = strdup(buf);
}
return symbol;
}
return NULL;
}
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