nes-proj/backyard/platform/c64/loader/loader-arch.c

141 lines
3.9 KiB
C

/**
* \file
* File loader implementation.
* \author Adam Dunkels <adam@dunkels.com>
*
* This file implements dynamically loadable files for Contiki using
* the cc65 module loading system. The actual file operations are
* implemented in other files.
*/
/*
* Copyright (c) 2003, Adam Dunkels.
* All rights reserved.
*
* 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. 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.
*
* This file is part of the Contiki desktop OS
*
* $Id: loader-arch.c,v 1.1 2007/05/23 23:11:29 oliverschmidt Exp $
*
*/
#include <stdlib.h>
#include <modload.h>
#include "cfs/cfs.h"
#include "sys/loader.h"
#include "loader-arch.h"
static int __fastcall__
do_read(int f, char *buf, unsigned int len)
{
return cfs_read(f, buf, len);
}
struct mod_ctrl ctrl = {
(void *)do_read /* Read from disk */
};
struct loader_arch_hdr {
char arch[8];
char version[8];
char initfunc[1];
};
/*-----------------------------------------------------------------------------------*/
/**
* Load a program from disk and execute it.
*
* Code originally written by Ullrich von Bassewitz.
*/
/*-----------------------------------------------------------------------------------*/
unsigned char
load(const char *name)
{
unsigned char res;
/* Now open the file */
ctrl.callerdata = cfs_open(name, 0);
if(ctrl.callerdata < 0) {
/* Could not open the file, display an error and return */
/* ### */
return LOADER_ERR_OPEN;
}
/* Load the module */
res = mod_load(&ctrl);
/* Close the input file */
cfs_close(ctrl.callerdata);
/* Check the return code */
if(res != MLOAD_OK) {
/* Wrong module, out of memory or whatever. Print an error
* message and return.
*/
/* ### */
return res;
}
/* We've successfully loaded the module. */
return LOADER_OK;
}
/*-----------------------------------------------------------------------------------*/
/**
* Load and start a program.
*
* \param name The name of the program file.
* \param arg A pointer that will be passed to the new process.
*/
/*-----------------------------------------------------------------------------------*/
unsigned char
loader_arch_load(const char *name, char *arg)
{
unsigned char r;
struct loader_arch_hdr *hdr;
r = load(name);
if(r != MLOAD_OK) {
return r;
}
hdr = (struct loader_arch_hdr *)ctrl.module;
/* Check the program header and see that version and architecture
matches. */
/* Call the init function. */
((void (*)(char *))hdr->initfunc)(arg);
return LOADER_OK;
}
/*-----------------------------------------------------------------------------------*/