From 5c105d9f3fd086aff195d3849dcf847d6b0bd927 Mon Sep 17 00:00:00 2001
From: blogic <blogic@3c298f89-4303-0410-b956-a3cf2f4a3e73>
Date: Fri, 5 Oct 2012 10:12:53 +0000
Subject: branch Attitude Adjustment

git-svn-id: svn://svn.openwrt.org/openwrt/branches/attitude_adjustment@33625 3c298f89-4303-0410-b956-a3cf2f4a3e73
---
 tools/firmware-utils/src/mkbrncmdline.c | 168 ++++++++++++++++++++++++++++++++
 1 file changed, 168 insertions(+)
 create mode 100644 tools/firmware-utils/src/mkbrncmdline.c

(limited to 'tools/firmware-utils/src/mkbrncmdline.c')

diff --git a/tools/firmware-utils/src/mkbrncmdline.c b/tools/firmware-utils/src/mkbrncmdline.c
new file mode 100644
index 000000000..6eb4bfe7c
--- /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;
+}
-- 
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