add fix size tools

this will allow to write the size of barebox at an offset of the binary

this is needed for ARM when using relocated binary

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

scripts/Makefile

@@ -7,6 +7,7 @@
 hostprogs-$(CONFIG_KALLSYMS)     += kallsyms
 hostprogs-y                      += bin2c
 hostprogs-y                      += mkimage
+hostprogs-y                      += fix_size
 hostprogs-y                      += bareboxenv
 hostprogs-$(CONFIG_ARCH_MVEBU)   += kwbimage kwboot
 hostprogs-$(CONFIG_ARCH_NETX)    += gen_netx_image

scripts/fix_size.c

@@ -0,0 +1,81 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <stdint.h>
+#include <fcntl.h>
+#ifndef _BSD_SOURCE
+#define _BSD_SOURCE             /* See feature_test_macros(7) */
+#endif
+#include <endian.h>
+
+int main(int argc, char**argv)
+{
+	struct stat s;
+	int c;
+	int fd;
+	uint64_t offset = 0;
+	uint32_t size = 0;
+	char *file = NULL;
+	int ret = 1;
+	int is_bigendian = 0;
+
+	while ((c = getopt (argc, argv, "hf:o:b")) != -1) {
+		switch (c) {
+		case 'f':
+			file = optarg;
+			break;
+		case 'o':
+			offset = strtoul(optarg, NULL, 16);
+			break;
+		case 'b':
+			is_bigendian = 1;
+			break;
+		}
+	}
+
+	if (!file) {
+		fprintf(stderr, "missing file\n");
+		return 1;
+	}
+
+	if (stat(file, &s)) {
+		perror("stat");
+		return 1;
+	}
+
+	fd = open(file, O_WRONLY);
+	if (fd < 0) {
+		perror("open");
+		return 1;
+	}
+
+	ret = lseek(fd, offset, SEEK_SET);
+	if (ret < 0) {
+		perror("lseek");
+		ret = 1;
+		goto err;
+	}
+
+	size = s.st_size;
+
+	if (is_bigendian)
+		size = htobe32(size);
+	else
+		size = htole32(size);
+
+	ret = write(fd, &size, 4);
+	if (ret != 4) {
+		perror("write");
+		ret = 1;
+		goto err;
+	}
+
+	ret = 0;
+err:
+
+	close(fd);
+
+	return ret;
+}