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-rw-r--r--tools/firmware-utils/src/mkbrncmdline.c168
1 files changed, 168 insertions, 0 deletions
diff --git a/tools/firmware-utils/src/mkbrncmdline.c b/tools/firmware-utils/src/mkbrncmdline.c
new file mode 100644
index 0000000..6eb4bfe
--- /dev/null
+++ b/tools/firmware-utils/src/mkbrncmdline.c
@@ -0,0 +1,168 @@
+/*
+ * 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;
+}