exec_bin.c

MIPS处理器的bootloader,龙芯就是用的修改过的PMON2

/* $Id: exec_bin.c,v 1.5 2003/06/05 21:40:36 patrik Exp $ */

/*
 * Copyright (c) 2000 Opsycon AB  (www.opsycon.se)
 * Copyright (c) 2002 Patrik Lindergren (www.lindergren.com)
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by Patrik Lindergren.
 *	This product includes software developed by Opsycon AB.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 */

#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <exec.h>

#include <pmon.h>
#include <pmon/loaders/loadfn.h>

static long   load_bin (int fd, char *buf, int *n, int flags);

extern long dl_minaddr;
extern long dl_maxaddr;

static long
   load_bin (int fd, char *buf, int *n, int flags)
{
	void *addr = (void *)dl_offset;
	int size = 512;
	int n2;
	int count = 0;

	fprintf (stderr, "(bin)\n");

	dl_minaddr = (long)addr;
	
	do {
		n2 = read (fd, addr, size);
		if (n2 < 0)
			break;
		addr = ((char *)addr + n2);
		count += n2;
	} while (n2 >= size);

	dl_maxaddr = (long)addr;
	printf("\nLoaded %d bytes\n", count);

	return(dl_offset);
}


static ExecType bin_exec =
{
	"bin",
	load_bin,
	EXECFLAGS_NOAUTO,
};


static void init_exec __P((void)) __attribute__ ((constructor));

static void
   init_exec()
{
	/*
	 * Install ram based file system.
	 */
	exec_init(&bin_exec);
}