/*
* Copyright (C) 2017 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 <getopt.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include "libfdt.h"
#include "dt_table.h"
struct dump_params {
const char *img_filename;
const char *out_filename;
const char *out_dtb_filename;
};
static const char short_options[] = "o:b:";
static struct option options[] = {
{ "output", required_argument, NULL, 'o' },
{ "dtb", required_argument, NULL, 'b' },
{ 0, 0, NULL, 0 }
};
static void *read_fdt_from_image(FILE *img_fp,
uint32_t dt_offset, uint32_t dt_size) {
void *fdt = NULL;
fdt = malloc(dt_size);
fseek(img_fp, dt_offset, SEEK_SET);
if (fread(fdt, dt_size, 1, img_fp) == 0) {
fprintf(stderr, "Read FDT data error.\n");
free(fdt);
return NULL;
}
return fdt;
}
static int write_fdt_to_file(const char *filename, const void *fdt) {
int ret = -1;
FILE *out_fp = NULL;
out_fp = fopen(filename, "wb");
if (!out_fp) {
fprintf(stderr, "Can not create file: %s\n", filename);
goto end;
}
size_t fdt_size = fdt_totalsize(fdt);
if (fwrite(fdt, fdt_size, 1, out_fp) < 1) {
fprintf(stderr, "Write FDT data error.\n");
goto end;
}
ret = 0;
end:
if (out_fp) fclose(out_fp);
return ret;
}
static void free_fdt(void *fdt) {
if (fdt == NULL) {
/* do nothing */
return;
}
free(fdt);
}
static void output_prop_int(FILE *out_fp, const char *name, uint32_t value) {
fprintf(out_fp, "%+20s = %d\n", name, fdt32_to_cpu(value));
}
static void output_prop_int_cpu(FILE *out_fp, const char *name, uint32_t value) {
fprintf(out_fp, "%+20s = %d\n", name, value);
}
static void output_prop_hex(FILE *out_fp, const char *name, uint32_t value) {
fprintf(out_fp, "%+20s = %08x\n", name, fdt32_to_cpu(value));
}
static void output_prop_str(FILE *out_fp, const char *name, const char *value) {
fprintf(out_fp, "%+20s = %s\n", name, value);
}
static void output_table_header(FILE *out_fp, const struct dt_table_header *header) {
fprintf(out_fp, "dt_table_header:\n");
output_prop_hex(out_fp, "magic", header->magic);
output_prop_int(out_fp, "total_size", header->total_size);
output_prop_int(out_fp, "header_size", header->header_size);
output_prop_int(out_fp, "dt_entry_size", header->dt_entry_size);
output_prop_int(out_fp, "dt_entry_count", header->dt_entry_count);
output_prop_int(out_fp, "dt_entries_offset", header->dt_entries_offset);
output_prop_int(out_fp, "page_size", header->page_size);
output_prop_int(out_fp, "version", header->version);
}
static void output_table_entry(FILE *out_fp, int index, const struct dt_table_entry *entry) {
fprintf(out_fp, "dt_table_entry[%d]:\n", index);
output_prop_int(out_fp, "dt_size", entry->dt_size);
output_prop_int(out_fp, "dt_offset", entry->dt_offset);
output_prop_hex(out_fp, "id", entry->id);
output_prop_hex(out_fp, "rev", entry->rev);
output_prop_hex(out_fp, "custom[0]", entry->custom[0]);
output_prop_hex(out_fp, "custom[1]", entry->custom[1]);
output_prop_hex(out_fp, "custom[2]", entry->custom[2]);
output_prop_hex(out_fp, "custom[3]", entry->custom[3]);
}
static int output_fdt_info(FILE *out_fp, void *fdt) {
size_t fdt_size = fdt_totalsize(fdt);
output_prop_int_cpu(out_fp, "(FDT)size", fdt_size);
int root_node_off = fdt_path_offset(fdt, "/");
if (root_node_off < 0) {
fprintf(stderr, "Can not get the root node.\n");
return -1;
}
const char *compatible =
(const char *)fdt_getprop(fdt, root_node_off, "compatible", NULL);
output_prop_str(out_fp, "(FDT)compatible", compatible ? compatible : "(unknown)");
return 0;
}
static int dump_image_from_fp(FILE *out_fp, FILE *img_fp,
const struct dump_params *params) {
struct dt_table_header header;
if (fread(&header, sizeof(header), 1, img_fp) != 1) {
fprintf(stderr, "Read error.\n");
return -1;
}
/* TODO: check header */
output_table_header(out_fp, &header);
uint32_t entry_size = fdt32_to_cpu(header.dt_entry_size);
uint32_t entry_offset = fdt32_to_cpu(header.dt_entries_offset);
uint32_t entry_count = fdt32_to_cpu(header.dt_entry_count);
uint32_t i;
for (i = 0; i < entry_count; i++) {
struct dt_table_entry entry;
fseek(img_fp, entry_offset, SEEK_SET);
if (fread(&entry, sizeof(entry), 1, img_fp) != 1) {
fprintf(stderr, "Read dt_table_entry error.\n");
return -1;
}
output_table_entry(out_fp, i, &entry);
uint32_t dt_size = fdt32_to_cpu(entry.dt_size);
uint32_t dt_offset = fdt32_to_cpu(entry.dt_offset);
if (dt_size > 0 && dt_offset > 0) {
void *fdt = read_fdt_from_image(img_fp, dt_offset, dt_size);
output_fdt_info(out_fp, fdt);
if (params->out_dtb_filename != NULL) {
char filename[256];
snprintf(filename, sizeof(filename), "%s.%d",
params->out_dtb_filename, i);
write_fdt_to_file(filename, fdt);
}
free_fdt(fdt);
}
entry_offset += entry_size;
}
return 0;
}
static int process_command_dump(const struct dump_params *params) {
int ret = -1;
FILE *out_fp = NULL;
FILE *img_fp = NULL;
img_fp = fopen(params->img_filename, "rb");
if (img_fp == NULL) {
fprintf(stderr, "Can not open image file: %s\n", params->img_filename);
goto end;
}
if (params->out_filename != NULL) {
out_fp = fopen(params->out_filename, "w");
if (out_fp == NULL) {
fprintf(stderr, "Can not create file: %s\n", params->out_filename);
goto end;
}
}
ret = dump_image_from_fp(out_fp ? out_fp : stdout, img_fp, params);
end:
if (img_fp) fclose(img_fp);
if (out_fp) fclose(out_fp);
return ret;
}
void handle_usage_dump(FILE *out_fp, const char *prog_name) {
fprintf(out_fp, " %s dump <image_file> (<option>...)\n\n", prog_name);
fprintf(out_fp,
" options:\n"
" -o, --output <filename> Output file name.\n"
" Default is output to stdout.\n"
" -b, --dtb <filename> Dump dtb/dtbo files from image.\n"
" Will output to <filename>.0, <filename>.1, etc.\n");
}
int handle_command_dump(int argc, char *argv[], int arg_start) {
if (argc - arg_start < 1) {
handle_usage_dump(stderr, argv[0]);
return 1;
}
struct dump_params params;
memset(¶ms, 0, sizeof(params));
params.img_filename = argv[arg_start];
optind = arg_start + 1;
while (1) {
int c = getopt_long(argc, argv, short_options, options, NULL);
if (c == -1) {
break;
}
switch (c) {
case 'o':
params.out_filename = optarg;
break;
case 'b':
params.out_dtb_filename = optarg;
break;
default:
/* Unknown option, return error */
return 1;
}
}
return process_command_dump(¶ms);
}