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- /*
- * mkbrncmdline.c - partially based on OpenWrt's wndr3700.c
- *
- * Copyright (C) 2011 Tobias Diedrich <ranma+openwrt@tdiedrich.de>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License,
- * version 2 as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- */
- #include <stdio.h>
- #include <stdlib.h>
- #include <stddef.h>
- #include <unistd.h>
- #include <errno.h>
- #include <fcntl.h>
- #include <sys/mman.h>
- #include <string.h>
- #include <netinet/in.h>
- #include <inttypes.h>
- static void usage(const char *) __attribute__ (( __noreturn__ ));
- static void usage(const char *mess)
- {
- fprintf(stderr, "Error: %s\n", mess);
- fprintf(stderr, "Usage: mkbrncmdline -i input_file -o output_file [-a loadaddress] arg1 [argx ...]\n");
- fprintf(stderr, "\n");
- exit(1);
- }
- static char *input_file = NULL;
- static char *output_file = NULL;
- static unsigned loadaddr = 0x80002000;
- static void parseopts(int *argc, char ***argv)
- {
- char *endptr;
- int res;
- while ((res = getopt(*argc, *argv, "a:i:o:")) != -1) {
- switch (res) {
- default:
- usage("Unknown option");
- break;
- case 'a':
- loadaddr = strtoul(optarg, &endptr, 0);
- if (endptr == optarg || *endptr != 0)
- usage("loadaddress must be a decimal or hexadecimal 32-bit value");
- break;
- case 'i':
- input_file = optarg;
- break;
- case 'o':
- output_file = optarg;
- break;
- }
- }
- *argc -= optind;
- *argv += optind;
- }
- static void emitload(int outfd, int reg, unsigned value)
- {
- char buf[8] = {
- 0x3c, 0x04 + reg,
- value >> 24, value >> 16,
- 0x34, 0x84 + reg + (reg << 5),
- value >> 8, value,
- };
- if (write(outfd, buf, sizeof(buf)) != sizeof(buf)) {
- fprintf(stderr, "write: %s\n", strerror(errno));
- exit(1);
- }
- }
- int main(int argc, char **argv)
- {
- int outfd;
- int i;
- int fd;
- size_t len, skip, buf_len;
- unsigned cmdline_addr;
- unsigned s_ofs;
- char *buf;
- parseopts(&argc, &argv);
- if (argc < 1)
- usage("must specify at least one kernel cmdline argument");
- if (input_file == NULL || output_file == NULL)
- usage("must specify input and output file");
- if ((outfd = open(output_file, O_WRONLY|O_CREAT|O_TRUNC, 0644)) == -1)
- {
- fprintf(stderr, "Error opening '%s' for writing: %s\n", output_file, strerror(errno));
- exit(1);
- }
- // mmap input_file
- if ((fd = open(input_file, O_RDONLY)) < 0
- || (len = lseek(fd, 0, SEEK_END)) < 0
- || (input_file = mmap(0, len, PROT_READ, MAP_SHARED, fd, 0)) == (void *) (-1)
- || close(fd) < 0)
- {
- fprintf(stderr, "Error mapping file '%s': %s\n", input_file, strerror(errno));
- exit(1);
- }
- cmdline_addr = loadaddr + len;
- // Kernel args are passed in registers a0,a1,a2 and a3
- emitload(outfd, 0, 0); /* a0 = 0 */
- emitload(outfd, 1, 0); /* a1 = 0 */
- emitload(outfd, 2, cmdline_addr); /* a2 = &cmdline */
- emitload(outfd, 3, 0); /* a3 = 0 */
- skip = lseek(outfd, 0, SEEK_END);
- // write the kernel
- if (write(outfd, input_file + skip, len - skip) != len -skip) {
- fprintf(stderr, "write: %s\n", strerror(errno));
- exit(1);
- }
- // write cmdline structure
- buf_len = (argc + 1) * 4;
- for (i=0; i<argc; i++) {
- buf_len += strlen(argv[i]) + 1;
- }
- buf = malloc(buf_len + 16);
- if (!buf) {
- fprintf(stderr, "Could not allocate memory for cmdline buffer\n");
- exit(1);
- }
- memset(buf, 0, buf_len);
- s_ofs = 4 * (argc + 1);
- for (i=0; i<argc; i++) {
- unsigned s_ptr = cmdline_addr + s_ofs;
- buf[i * 4 + 0] = s_ptr >> 24;
- buf[i * 4 + 1] = s_ptr >> 16;
- buf[i * 4 + 2] = s_ptr >> 8;
- buf[i * 4 + 3] = s_ptr >> 0;
- memcpy(&buf[s_ofs], argv[i], strlen(argv[i]));
- s_ofs += strlen(argv[i]) + 1;
- }
- if (write(outfd, buf, buf_len) != buf_len) {
- fprintf(stderr, "write: %s\n", strerror(errno));
- exit(1);
- }
- munmap(input_file, len);
- close(outfd);
- free(buf);
- return 0;
- }
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