mkimage.c

ARM的bootloader代码.rar

	 * Must be -w then:
	 *
	 * write dummy header, to be fixed later
	 */
	memset (hdr, 0, sizeof(image_header_t));

	if (write(ifd, hdr, sizeof(image_header_t)) != sizeof(image_header_t)) {
		fprintf (stderr, "%s: Write error on %s: %s\n",
			cmdname, imagefile, strerror(errno));
		exit (EXIT_FAILURE);
	}

	if (opt_type == IH_TYPE_MULTI || opt_type == IH_TYPE_SCRIPT) {
		char *file = datafile;
		unsigned long size;

		for (;;) {
			char *sep = NULL;

			if (file) {
				if ((sep = strchr(file, ':')) != NULL) {
					*sep = '\0';
				}

				if (stat (file, &sbuf) < 0) {
					fprintf (stderr, "%s: Can't stat %s: %s\n",
						cmdname, file, strerror(errno));
					exit (EXIT_FAILURE);
				}
				size = htonl(sbuf.st_size);
			} else {
				size = 0;
			}

			if (write(ifd, (char *)&size, sizeof(size)) != sizeof(size)) {
				fprintf (stderr, "%s: Write error on %s: %s\n",
					cmdname, imagefile, strerror(errno));
				exit (EXIT_FAILURE);
			}

			if (!file) {
				break;
			}

			if (sep) {
				*sep = ':';
				file = sep + 1;
			} else {
				file = NULL;
			}
		}

		file = datafile;

		for (;;) {
			char *sep = strchr(file, ':');
			if (sep) {
				*sep = '\0';
				copy_file (ifd, file, 1);
				*sep++ = ':';
				file = sep;
			} else {
				copy_file (ifd, file, 0);
				break;
			}
		}
	} else {
		copy_file (ifd, datafile, 0);
	}

	/* We're a bit of paranoid */
#if defined(_POSIX_SYNCHRONIZED_IO) && !defined(__sun__)
	(void) fdatasync (ifd);
#else
	(void) fsync (ifd);
#endif

	if (fstat(ifd, &sbuf) < 0) {
		fprintf (stderr, "%s: Can't stat %s: %s\n",
			cmdname, imagefile, strerror(errno));
		exit (EXIT_FAILURE);
	}

	ptr = (unsigned char *)mmap(0, sbuf.st_size,
				    PROT_READ|PROT_WRITE, MAP_SHARED, ifd, 0);
	if (ptr == MAP_FAILED) {
		fprintf (stderr, "%s: Can't map %s: %s\n",
			cmdname, imagefile, strerror(errno));
		exit (EXIT_FAILURE);
	}

	hdr = (image_header_t *)ptr;

	checksum = crc32 (0,
			  (const char *)(ptr + sizeof(image_header_t)),
			  sbuf.st_size - sizeof(image_header_t)
			 );

	/* Build new header */
	hdr->ih_magic = htonl(IH_MAGIC);
	hdr->ih_time  = htonl(sbuf.st_mtime);
	hdr->ih_size  = htonl(sbuf.st_size - sizeof(image_header_t));
	hdr->ih_load  = htonl(addr);
	hdr->ih_ep    = htonl(ep);
	hdr->ih_dcrc  = htonl(checksum);
	hdr->ih_os    = opt_os;
	hdr->ih_arch  = opt_arch;
	hdr->ih_type  = opt_type;
	hdr->ih_comp  = opt_comp;

	strncpy((char *)hdr->ih_name, name, IH_NMLEN);

	checksum = crc32(0,(const char *)hdr,sizeof(image_header_t));

	hdr->ih_hcrc = htonl(checksum);

	print_header (hdr);

	(void) munmap((void *)ptr, sbuf.st_size);

	if (close(ifd)) {
		fprintf (stderr, "%s: Write error on %s: %s\n",
			cmdname, imagefile, strerror(errno));
		exit (EXIT_FAILURE);
	}

	exit (EXIT_SUCCESS);
}

static void
copy_file (int ifd, const char *datafile, int pad)
{
	int dfd;
	struct stat sbuf;
	unsigned char *ptr;
	int tail;
	int zero = 0;

	if (vflag) {
		fprintf (stderr, "Adding Image %s\n", datafile);
	}

	if ((dfd = open(datafile, O_RDONLY)) < 0) {
		fprintf (stderr, "%s: Can't open %s: %s\n",
			cmdname, datafile, strerror(errno));
		exit (EXIT_FAILURE);
	}

	if (fstat(dfd, &sbuf) < 0) {
		fprintf (stderr, "%s: Can't stat %s: %s\n",
			cmdname, datafile, strerror(errno));
		exit (EXIT_FAILURE);
	}

	ptr = (unsigned char *)mmap(0, sbuf.st_size,
				    PROT_READ, MAP_SHARED, dfd, 0);
	if (ptr == MAP_FAILED) {
		fprintf (stderr, "%s: Can't read %s: %s\n",
			cmdname, datafile, strerror(errno));
		exit (EXIT_FAILURE);
	}

	if (write(ifd, ptr, sbuf.st_size) != sbuf.st_size) {
		fprintf (stderr, "%s: Write error on %s: %s\n",
			cmdname, imagefile, strerror(errno));
		exit (EXIT_FAILURE);
	}

	if (pad && ((tail = sbuf.st_size % 4) != 0)) {

		if (write(ifd, (char *)&zero, 4-tail) != 4-tail) {
			fprintf (stderr, "%s: Write error on %s: %s\n",
				cmdname, imagefile, strerror(errno));
			exit (EXIT_FAILURE);
		}
	}

	(void) munmap((void *)ptr, sbuf.st_size);
	(void) close (dfd);
}

void
usage ()
{
	fprintf (stderr, "Usage: %s -l image\n"
			 "          -l ==> list image header information\n"
			 "       %s -A arch -O os -T type -C comp "
			 "-a addr -e ep -n name -d data_file[:data_file...] image\n",
		cmdname, cmdname);
	fprintf (stderr, "          -A ==> set architecture to 'arch'\n"
			 "          -O ==> set operating system to 'os'\n"
			 "          -T ==> set image type to 'type'\n"
			 "          -C ==> set compression type 'comp'\n"
			 "          -a ==> set load address to 'addr' (hex)\n"
			 "          -e ==> set entry point to 'ep' (hex)\n"
			 "          -n ==> set image name to 'name'\n"
			 "          -d ==> use image data from 'datafile'\n"
		);
	exit (EXIT_FAILURE);
}

static void
print_header (image_header_t *hdr)
{
	time_t timestamp;
	uint32_t size;

	timestamp = (time_t)ntohl(hdr->ih_time);
	size = ntohl(hdr->ih_size);

	printf ("Image Name:   %.*s\n", IH_NMLEN, hdr->ih_name);
	printf ("Created:      %s", ctime(&timestamp));
	printf ("Image Type:   "); print_type(hdr);
	printf ("Data Size:    %d Bytes = %.2f kB = %.2f MB\n",
		size, (double)size / 1.024e3, (double)size / 1.048576e6 );
	printf ("Load Address: 0x%08x\n", ntohl(hdr->ih_load));
	printf ("Entry Point:  0x%08x\n", ntohl(hdr->ih_ep));

	if (hdr->ih_type == IH_TYPE_MULTI || hdr->ih_type == IH_TYPE_SCRIPT) {
		int i, ptrs;
		uint32_t pos;
		unsigned long *len_ptr = (unsigned long *) (
					(unsigned long)hdr + sizeof(image_header_t)
				);

		/* determine number of images first (to calculate image offsets) */
		for (i=0; len_ptr[i]; ++i)	/* null pointer terminates list */
			;
		ptrs = i;		/* null pointer terminates list */

		pos = sizeof(image_header_t) + ptrs * sizeof(long);
		printf ("Contents:\n");
		for (i=0; len_ptr[i]; ++i) {
			size = ntohl(len_ptr[i]);

			printf ("   Image %d: %8d Bytes = %4d kB = %d MB\n",
				i, size, size>>10, size>>20);
			if (hdr->ih_type == IH_TYPE_SCRIPT && i > 0) {
				/* 
                                 * the user may need to know offsets
                                 * if planning to do something with
                                 * multiple files
				 */
				printf ("    Offset = %08x\n", pos);
			}
			/* copy_file() will pad the first files to even word align */
			size += 3;
			size &= ~3;
			pos += size;
		}
	}
}


static void
print_type (image_header_t *hdr)
{
	printf ("%s %s %s (%s)\n",
		put_arch (hdr->ih_arch),
		put_os   (hdr->ih_os  ),
		put_type (hdr->ih_type),
		put_comp (hdr->ih_comp)
	);
}

static char *put_arch (int arch)
{
	return (put_table_entry(arch_name, "Unknown Architecture", arch));
}

static char *put_os (int os)
{
	return (put_table_entry(os_name, "Unknown OS", os));
}

static char *put_type (int type)
{
	return (put_table_entry(type_name, "Unknown Image", type));
}

static char *put_comp (int comp)
{
	return (put_table_entry(comp_name, "Unknown Compression", comp));
}

static char *put_table_entry (table_entry_t *table, char *msg, int type)
{
	for (; table->val>=0; ++table) {
		if (table->val == type)
			return (table->lname);
	}
	return (msg);
}

static int get_arch(char *name)
{
	return (get_table_entry(arch_name, "CPU", name));
}


static int get_comp(char *name)
{
	return (get_table_entry(comp_name, "Compression", name));
}


static int get_os (char *name)
{
	return (get_table_entry(os_name, "OS", name));
}


static int get_type(char *name)
{
	return (get_table_entry(type_name, "Image", name));
}

static int get_table_entry (table_entry_t *table, char *msg, char *name)
{
	table_entry_t *t;
	int first = 1;

	for (t=table; t->val>=0; ++t) {
		if (t->sname && strcasecmp(t->sname, name)==0)
			return (t->val);
	}
	fprintf (stderr, "\nInvalid %s Type - valid names are", msg);
	for (t=table; t->val>=0; ++t) {
		if (t->sname == NULL)
			continue;
		fprintf (stderr, "%c %s", (first) ? ':' : ',', t->sname);
		first = 0;
	}
	fprintf (stderr, "\n");
	return (-1);
}