/* tools/mkbootimg/mkbootimg.c
**
** Copyright 2007, 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <stdbool.h>
#include "mincrypt/sha.h"
#include "bootimg.h"
static void *load_file(const char *fn, unsigned *_sz)
{
char *data;
int sz;
int fd;
data = 0;
fd = open(fn, O_RDONLY);
if(fd < 0) return 0;
sz = lseek(fd, 0, SEEK_END);
if(sz < 0) goto oops;
if(lseek(fd, 0, SEEK_SET) != 0) goto oops;
data = (char*) malloc(sz);
if(data == 0) goto oops;
if(read(fd, data, sz) != sz) goto oops;
close(fd);
if(_sz) *_sz = sz;
return data;
oops:
close(fd);
if(data != 0) free(data);
return 0;
}
int usage(void)
{
fprintf(stderr,"usage: mkbootimg\n"
" --kernel <filename>\n"
" [ --ramdisk <filename> ]\n"
" [ --second <2ndbootloader-filename> ]\n"
" [ --cmdline <kernel-commandline> ]\n"
" [ --board <boardname> ]\n"
" [ --base <address> ]\n"
" [ --pagesize <pagesize> ]\n"
" [ --id ]\n"
" -o|--output <filename>\n"
);
return 1;
}
static unsigned char padding[16384] = { 0, };
static void print_id(const uint8_t *id, size_t id_len) {
printf("0x");
for (unsigned i = 0; i < id_len; i++) {
printf("%02x", id[i]);
}
printf("\n");
}
int write_padding(int fd, unsigned pagesize, unsigned itemsize)
{
unsigned pagemask = pagesize - 1;
ssize_t count;
if((itemsize & pagemask) == 0) {
return 0;
}
count = pagesize - (itemsize & pagemask);
if(write(fd, padding, count) != count) {
return -1;
} else {
return 0;
}
}
int main(int argc, char **argv)
{
boot_img_hdr hdr;
char *kernel_fn = NULL;
void *kernel_data = NULL;
char *ramdisk_fn = NULL;
void *ramdisk_data = NULL;
char *second_fn = NULL;
void *second_data = NULL;
char *cmdline = "";
char *bootimg = NULL;
char *board = "";
uint32_t pagesize = 2048;
int fd;
SHA_CTX ctx;
const uint8_t* sha;
uint32_t base = 0x10000000U;
uint32_t kernel_offset = 0x00008000U;
uint32_t ramdisk_offset = 0x01000000U;
uint32_t second_offset = 0x00f00000U;
uint32_t tags_offset = 0x00000100U;
size_t cmdlen;
argc--;
argv++;
memset(&hdr, 0, sizeof(hdr));
bool get_id = false;
while(argc > 0){
char *arg = argv[0];
if (!strcmp(arg, "--id")) {
get_id = true;
argc -= 1;
argv += 1;
} else if(argc >= 2) {
char *val = argv[1];
argc -= 2;
argv += 2;
if(!strcmp(arg, "--output") || !strcmp(arg, "-o")) {
bootimg = val;
} else if(!strcmp(arg, "--kernel")) {
kernel_fn = val;
} else if(!strcmp(arg, "--ramdisk")) {
ramdisk_fn = val;
} else if(!strcmp(arg, "--second")) {
second_fn = val;
} else if(!strcmp(arg, "--cmdline")) {
cmdline = val;
} else if(!strcmp(arg, "--base")) {
base = strtoul(val, 0, 16);
} else if(!strcmp(arg, "--kernel_offset")) {
kernel_offset = strtoul(val, 0, 16);
} else if(!strcmp(arg, "--ramdisk_offset")) {
ramdisk_offset = strtoul(val, 0, 16);
} else if(!strcmp(arg, "--second_offset")) {
second_offset = strtoul(val, 0, 16);
} else if(!strcmp(arg, "--tags_offset")) {
tags_offset = strtoul(val, 0, 16);
} else if(!strcmp(arg, "--board")) {
board = val;
} else if(!strcmp(arg,"--pagesize")) {
pagesize = strtoul(val, 0, 10);
if ((pagesize != 2048) && (pagesize != 4096)
&& (pagesize != 8192) && (pagesize != 16384)) {
fprintf(stderr,"error: unsupported page size %d\n", pagesize);
return -1;
}
} else {
return usage();
}
} else {
return usage();
}
}
hdr.page_size = pagesize;
hdr.kernel_addr = base + kernel_offset;
hdr.ramdisk_addr = base + ramdisk_offset;
hdr.second_addr = base + second_offset;
hdr.tags_addr = base + tags_offset;
if(bootimg == 0) {
fprintf(stderr,"error: no output filename specified\n");
return usage();
}
if(kernel_fn == 0) {
fprintf(stderr,"error: no kernel image specified\n");
return usage();
}
if(strlen(board) >= BOOT_NAME_SIZE) {
fprintf(stderr,"error: board name too large\n");
return usage();
}
strcpy((char *) hdr.name, board);
memcpy(hdr.magic, BOOT_MAGIC, BOOT_MAGIC_SIZE);
cmdlen = strlen(cmdline);
if(cmdlen > (BOOT_ARGS_SIZE + BOOT_EXTRA_ARGS_SIZE - 2)) {
fprintf(stderr,"error: kernel commandline too large\n");
return 1;
}
/* Even if we need to use the supplemental field, ensure we
* are still NULL-terminated */
strncpy((char *)hdr.cmdline, cmdline, BOOT_ARGS_SIZE - 1);
hdr.cmdline[BOOT_ARGS_SIZE - 1] = '\0';
if (cmdlen >= (BOOT_ARGS_SIZE - 1)) {
cmdline += (BOOT_ARGS_SIZE - 1);
strncpy((char *)hdr.extra_cmdline, cmdline, BOOT_EXTRA_ARGS_SIZE);
}
kernel_data = load_file(kernel_fn, &hdr.kernel_size);
if(kernel_data == 0) {
fprintf(stderr,"error: could not load kernel '%s'\n", kernel_fn);
return 1;
}
if(ramdisk_fn == 0) {
ramdisk_data = 0;
hdr.ramdisk_size = 0;
} else {
ramdisk_data = load_file(ramdisk_fn, &hdr.ramdisk_size);
if(ramdisk_data == 0) {
fprintf(stderr,"error: could not load ramdisk '%s'\n", ramdisk_fn);
return 1;
}
}
if(second_fn) {
second_data = load_file(second_fn, &hdr.second_size);
if(second_data == 0) {
fprintf(stderr,"error: could not load secondstage '%s'\n", second_fn);
return 1;
}
}
/* put a hash of the contents in the header so boot images can be
* differentiated based on their first 2k.
*/
SHA_init(&ctx);
SHA_update(&ctx, kernel_data, hdr.kernel_size);
SHA_update(&ctx, &hdr.kernel_size, sizeof(hdr.kernel_size));
SHA_update(&ctx, ramdisk_data, hdr.ramdisk_size);
SHA_update(&ctx, &hdr.ramdisk_size, sizeof(hdr.ramdisk_size));
SHA_update(&ctx, second_data, hdr.second_size);
SHA_update(&ctx, &hdr.second_size, sizeof(hdr.second_size));
sha = SHA_final(&ctx);
memcpy(hdr.id, sha,
SHA_DIGEST_SIZE > sizeof(hdr.id) ? sizeof(hdr.id) : SHA_DIGEST_SIZE);
fd = open(bootimg, O_CREAT | O_TRUNC | O_WRONLY, 0644);
if(fd < 0) {
fprintf(stderr,"error: could not create '%s'\n", bootimg);
return 1;
}
if(write(fd, &hdr, sizeof(hdr)) != sizeof(hdr)) goto fail;
if(write_padding(fd, pagesize, sizeof(hdr))) goto fail;
if(write(fd, kernel_data, hdr.kernel_size) != (ssize_t) hdr.kernel_size) goto fail;
if(write_padding(fd, pagesize, hdr.kernel_size)) goto fail;
if(write(fd, ramdisk_data, hdr.ramdisk_size) != (ssize_t) hdr.ramdisk_size) goto fail;
if(write_padding(fd, pagesize, hdr.ramdisk_size)) goto fail;
if(second_data) {
if(write(fd, second_data, hdr.second_size) != (ssize_t) hdr.second_size) goto fail;
if(write_padding(fd, pagesize, hdr.second_size)) goto fail;
}
if (get_id) {
print_id((uint8_t *) hdr.id, sizeof(hdr.id));
}
return 0;
fail:
unlink(bootimg);
close(fd);
fprintf(stderr,"error: failed writing '%s': %s\n", bootimg,
strerror(errno));
return 1;
}