nkeynes@102: /**
nkeynes@182:  * $Id: dcload.c,v 1.4 2006-07-06 08:47:33 nkeynes Exp $
nkeynes@102:  * 
nkeynes@102:  * DC-load syscall implementation.
nkeynes@102:  *
nkeynes@102:  * Copyright (c) 2005 Nathan Keynes.
nkeynes@102:  *
nkeynes@102:  * This program is free software; you can redistribute it and/or modify
nkeynes@102:  * it under the terms of the GNU General Public License as published by
nkeynes@102:  * the Free Software Foundation; either version 2 of the License, or
nkeynes@102:  * (at your option) any later version.
nkeynes@102:  *
nkeynes@102:  * This program is distributed in the hope that it will be useful,
nkeynes@102:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
nkeynes@102:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
nkeynes@102:  * GNU General Public License for more details.
nkeynes@102:  */
nkeynes@102: 
nkeynes@102: #include <stdio.h>
nkeynes@102: #include "dream.h"
nkeynes@182: #include "dreamcast.h"
nkeynes@102: #include "mem.h"
nkeynes@102: #include "syscall.h"
nkeynes@102: #include "sh4/sh4core.h"
nkeynes@102: 
nkeynes@102: #define SYS_READ 0
nkeynes@102: #define SYS_WRITE 1
nkeynes@102: #define SYS_OPEN 2
nkeynes@102: #define SYS_CLOSE 3
nkeynes@102: #define SYS_CREAT 4
nkeynes@102: #define SYS_LINK 5
nkeynes@102: #define SYS_UNLINK 6
nkeynes@102: #define SYS_CHDIR 7
nkeynes@102: #define SYS_CHMOD 8
nkeynes@102: #define SYS_LSEEK 9
nkeynes@102: #define SYS_FSTAT 10
nkeynes@102: #define SYS_TIME 11
nkeynes@102: #define SYS_STAT 12
nkeynes@102: #define SYS_UTIME 13
nkeynes@102: #define SYS_ASSIGNWRKMEM 14
nkeynes@102: #define SYS_EXIT 15
nkeynes@102: #define SYS_OPENDIR 16
nkeynes@102: #define SYS_CLOSEDIR 17
nkeynes@102: #define SYS_READDIR 18
nkeynes@102: #define SYS_GETHOSTINFO 19
nkeynes@102: 
nkeynes@102: #define SYS_MAGIC 0xDEADBEEF
nkeynes@102: #define SYS_MAGIC_ADDR 0x8c004004
nkeynes@102: #define SYSCALL_ADDR 0x8c004008
nkeynes@102: 
nkeynes@182: static gboolean dcload_allow_exit = FALSE;
nkeynes@182: 
nkeynes@182: void dcload_set_allow_exit( gboolean allow )
nkeynes@182: {
nkeynes@182:     dcload_allow_exit = allow;
nkeynes@182: }
nkeynes@182: 
nkeynes@102: void dcload_syscall( uint32_t syscall_id ) 
nkeynes@102: {
nkeynes@102:     uint32_t syscall = sh4r.r[4];
nkeynes@102:     switch( sh4r.r[4] ) {
nkeynes@102:     case SYS_READ:
nkeynes@102: 	if( sh4r.r[5] == 0 ) {
nkeynes@102: 	    char *buf = mem_get_region( sh4r.r[6] );
nkeynes@102: 	    int length = sh4r.r[7];
nkeynes@102: 	    sh4r.r[0] = read( 0, buf, length );
nkeynes@102: 	} else {
nkeynes@102: 	    sh4r.r[0] = -1;
nkeynes@102: 	}
nkeynes@102: 	break;
nkeynes@102:     case SYS_WRITE:
nkeynes@102: 	if( sh4r.r[5] == 1 || sh4r.r[5] == 2 ) {
nkeynes@102: 	    char *buf = mem_get_region( sh4r.r[6] );
nkeynes@102: 	    int length = sh4r.r[7];
nkeynes@102: 	    sh4r.r[0] = write( sh4r.r[5], buf, length );
nkeynes@102: 	} else {
nkeynes@102: 	    sh4r.r[0] = -1;
nkeynes@102: 	}
nkeynes@102: 	break;
nkeynes@102:     case SYS_EXIT:
nkeynes@182: 	if( dcload_allow_exit ) 
nkeynes@182: 	    exit( sh4r.r[4] );
nkeynes@182: 	else
nkeynes@182: 	    dreamcast_stop();
nkeynes@102:     default:
nkeynes@102: 	sh4r.r[0] = -1;
nkeynes@102:     }
nkeynes@102: 
nkeynes@102: }
nkeynes@102: 
nkeynes@102: void dcload_install() 
nkeynes@102: {
nkeynes@102:     syscall_add_hook_vector( 0xF0, SYSCALL_ADDR, dcload_syscall );
nkeynes@102:     sh4_write_long( SYS_MAGIC_ADDR, SYS_MAGIC );
nkeynes@102: }