278 lines
7.9 KiB
C
278 lines
7.9 KiB
C
/* tools/mkbootimg/mkbootimg.c
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**
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** Copyright 2007, The Android Open Source Project
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**
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** Licensed under the Apache License, Version 2.0 (the "License");
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** you may not use this file except in compliance with the License.
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** You may obtain a copy of the License at
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**
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** http://www.apache.org/licenses/LICENSE-2.0
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**
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** Unless required by applicable law or agreed to in writing, software
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** distributed under the License is distributed on an "AS IS" BASIS,
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** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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** See the License for the specific language governing permissions and
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** limitations under the License.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include "mincrypt/sha.h"
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#include "bootimg.h"
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static void *load_file(const char *fn, unsigned *_sz)
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{
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char *data;
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int sz;
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int fd;
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data = 0;
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fd = open(fn, O_RDONLY);
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if(fd < 0) return 0;
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sz = lseek(fd, 0, SEEK_END);
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if(sz < 0) goto oops;
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if(lseek(fd, 0, SEEK_SET) != 0) goto oops;
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data = (char*) malloc(sz);
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if(data == 0) goto oops;
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if(read(fd, data, sz) != sz) goto oops;
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close(fd);
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if(_sz) *_sz = sz;
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return data;
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oops:
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close(fd);
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if(data != 0) free(data);
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return 0;
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}
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int usage(void)
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{
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fprintf(stderr,"usage: mkbootimg\n"
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" --kernel <filename>\n"
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" --ramdisk <filename>\n"
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" [ --second <2ndbootloader-filename> ]\n"
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" [ --cmdline <kernel-commandline> ]\n"
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" [ --board <boardname> ]\n"
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" [ --base <address> ]\n"
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" [ --pagesize <pagesize> ]\n"
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" -o|--output <filename>\n"
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);
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return 1;
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}
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static unsigned char padding[16384] = { 0, };
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int write_padding(int fd, unsigned pagesize, unsigned itemsize)
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{
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unsigned pagemask = pagesize - 1;
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ssize_t count;
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if((itemsize & pagemask) == 0) {
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return 0;
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}
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count = pagesize - (itemsize & pagemask);
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if(write(fd, padding, count) != count) {
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return -1;
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} else {
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return 0;
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}
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}
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int main(int argc, char **argv)
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{
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boot_img_hdr hdr;
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char *kernel_fn = 0;
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void *kernel_data = 0;
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char *ramdisk_fn = 0;
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void *ramdisk_data = 0;
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char *second_fn = 0;
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void *second_data = 0;
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char *cmdline = "";
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char *bootimg = 0;
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char *board = "";
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unsigned pagesize = 2048;
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int fd;
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SHA_CTX ctx;
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const uint8_t* sha;
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unsigned base = 0x10000000;
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unsigned kernel_offset = 0x00008000;
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unsigned ramdisk_offset = 0x01000000;
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unsigned second_offset = 0x00f00000;
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unsigned tags_offset = 0x00000100;
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size_t cmdlen;
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argc--;
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argv++;
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memset(&hdr, 0, sizeof(hdr));
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while(argc > 0){
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char *arg = argv[0];
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char *val = argv[1];
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if(argc < 2) {
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return usage();
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}
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argc -= 2;
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argv += 2;
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if(!strcmp(arg, "--output") || !strcmp(arg, "-o")) {
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bootimg = val;
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} else if(!strcmp(arg, "--kernel")) {
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kernel_fn = val;
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} else if(!strcmp(arg, "--ramdisk")) {
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ramdisk_fn = val;
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} else if(!strcmp(arg, "--second")) {
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second_fn = val;
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} else if(!strcmp(arg, "--cmdline")) {
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cmdline = val;
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} else if(!strcmp(arg, "--base")) {
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base = strtoul(val, 0, 16);
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} else if(!strcmp(arg, "--kernel_offset")) {
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kernel_offset = strtoul(val, 0, 16);
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} else if(!strcmp(arg, "--ramdisk_offset")) {
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ramdisk_offset = strtoul(val, 0, 16);
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} else if(!strcmp(arg, "--second_offset")) {
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second_offset = strtoul(val, 0, 16);
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} else if(!strcmp(arg, "--tags_offset")) {
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tags_offset = strtoul(val, 0, 16);
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} else if(!strcmp(arg, "--board")) {
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board = val;
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} else if(!strcmp(arg,"--pagesize")) {
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pagesize = strtoul(val, 0, 10);
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if ((pagesize != 2048) && (pagesize != 4096)
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&& (pagesize != 8192) && (pagesize != 16384)) {
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fprintf(stderr,"error: unsupported page size %d\n", pagesize);
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return -1;
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}
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} else {
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return usage();
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}
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}
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hdr.page_size = pagesize;
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hdr.kernel_addr = base + kernel_offset;
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hdr.ramdisk_addr = base + ramdisk_offset;
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hdr.second_addr = base + second_offset;
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hdr.tags_addr = base + tags_offset;
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if(bootimg == 0) {
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fprintf(stderr,"error: no output filename specified\n");
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return usage();
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}
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if(kernel_fn == 0) {
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fprintf(stderr,"error: no kernel image specified\n");
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return usage();
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}
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if(ramdisk_fn == 0) {
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fprintf(stderr,"error: no ramdisk image specified\n");
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return usage();
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}
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if(strlen(board) >= BOOT_NAME_SIZE) {
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fprintf(stderr,"error: board name too large\n");
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return usage();
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}
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strcpy((char *) hdr.name, board);
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memcpy(hdr.magic, BOOT_MAGIC, BOOT_MAGIC_SIZE);
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cmdlen = strlen(cmdline);
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if(cmdlen > (BOOT_ARGS_SIZE + BOOT_EXTRA_ARGS_SIZE - 2)) {
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fprintf(stderr,"error: kernel commandline too large\n");
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return 1;
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}
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/* Even if we need to use the supplemental field, ensure we
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* are still NULL-terminated */
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strncpy((char *)hdr.cmdline, cmdline, BOOT_ARGS_SIZE - 1);
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hdr.cmdline[BOOT_ARGS_SIZE - 1] = '\0';
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if (cmdlen >= (BOOT_ARGS_SIZE - 1)) {
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cmdline += (BOOT_ARGS_SIZE - 1);
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strncpy((char *)hdr.extra_cmdline, cmdline, BOOT_EXTRA_ARGS_SIZE);
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}
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kernel_data = load_file(kernel_fn, &hdr.kernel_size);
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if(kernel_data == 0) {
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fprintf(stderr,"error: could not load kernel '%s'\n", kernel_fn);
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return 1;
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}
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if(!strcmp(ramdisk_fn,"NONE")) {
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ramdisk_data = 0;
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hdr.ramdisk_size = 0;
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} else {
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ramdisk_data = load_file(ramdisk_fn, &hdr.ramdisk_size);
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if(ramdisk_data == 0) {
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fprintf(stderr,"error: could not load ramdisk '%s'\n", ramdisk_fn);
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return 1;
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}
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}
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if(second_fn) {
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second_data = load_file(second_fn, &hdr.second_size);
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if(second_data == 0) {
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fprintf(stderr,"error: could not load secondstage '%s'\n", second_fn);
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return 1;
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}
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}
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/* put a hash of the contents in the header so boot images can be
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* differentiated based on their first 2k.
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*/
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SHA_init(&ctx);
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SHA_update(&ctx, kernel_data, hdr.kernel_size);
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SHA_update(&ctx, &hdr.kernel_size, sizeof(hdr.kernel_size));
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SHA_update(&ctx, ramdisk_data, hdr.ramdisk_size);
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SHA_update(&ctx, &hdr.ramdisk_size, sizeof(hdr.ramdisk_size));
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SHA_update(&ctx, second_data, hdr.second_size);
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SHA_update(&ctx, &hdr.second_size, sizeof(hdr.second_size));
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sha = SHA_final(&ctx);
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memcpy(hdr.id, sha,
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SHA_DIGEST_SIZE > sizeof(hdr.id) ? sizeof(hdr.id) : SHA_DIGEST_SIZE);
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fd = open(bootimg, O_CREAT | O_TRUNC | O_WRONLY, 0644);
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if(fd < 0) {
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fprintf(stderr,"error: could not create '%s'\n", bootimg);
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return 1;
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}
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if(write(fd, &hdr, sizeof(hdr)) != sizeof(hdr)) goto fail;
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if(write_padding(fd, pagesize, sizeof(hdr))) goto fail;
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if(write(fd, kernel_data, hdr.kernel_size) != (ssize_t) hdr.kernel_size) goto fail;
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if(write_padding(fd, pagesize, hdr.kernel_size)) goto fail;
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if(write(fd, ramdisk_data, hdr.ramdisk_size) != (ssize_t) hdr.ramdisk_size) goto fail;
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if(write_padding(fd, pagesize, hdr.ramdisk_size)) goto fail;
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if(second_data) {
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if(write(fd, second_data, hdr.second_size) != (ssize_t) hdr.second_size) goto fail;
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if(write_padding(fd, pagesize, hdr.second_size)) goto fail;
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}
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return 0;
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fail:
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unlink(bootimg);
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close(fd);
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fprintf(stderr,"error: failed writing '%s': %s\n", bootimg,
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strerror(errno));
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return 1;
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}
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