nkeynes@102: /**
nkeynes@561:  * $Id$
nkeynes@102:  * 
nkeynes@102:  * Routines to add hook functions that are callable from the SH4
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 "dream.h"
nkeynes@102: #include "mem.h"
nkeynes@102: #include "syscall.h"
nkeynes@102: #include "sh4/sh4core.h"
nkeynes@102: 
nkeynes@102: 
nkeynes@102: struct syscall_hook {
nkeynes@102:     syscall_hook_func_t hook;
nkeynes@102:     sh4addr_t vector;
nkeynes@102: } syscall_hooks[256];
nkeynes@102: 
nkeynes@102: void syscall_add_hook( uint32_t hook_id, syscall_hook_func_t hook ) 
nkeynes@102: {
nkeynes@102:     hook_id &= 0xFF;
nkeynes@102:     if( syscall_hooks[hook_id].hook != NULL )
nkeynes@102: 	WARN( "Overwriting existing hook %02X", hook_id );
nkeynes@102:     syscall_hooks[hook_id].hook = hook;
nkeynes@102:     syscall_hooks[hook_id].vector = 0;
nkeynes@102: }
nkeynes@102: 
nkeynes@102: void syscall_add_hook_vector( uint32_t hook_id, uint32_t vector_addr,
nkeynes@102: 			      syscall_hook_func_t hook )
nkeynes@102: {
nkeynes@102:     hook_id &= 0xFF;
nkeynes@102:     syscall_add_hook( hook_id, hook );
nkeynes@102:     syscall_hooks[hook_id].vector = vector_addr;
nkeynes@102:     sh4_write_long( vector_addr, 0xFFFFFF00 + hook_id );
nkeynes@102: }
nkeynes@102: 
nkeynes@102: void syscall_invoke( uint32_t hook_id )
nkeynes@102: {
nkeynes@102:     hook_id &= 0xFF;
nkeynes@102:     syscall_hook_func_t hook = syscall_hooks[hook_id].hook;
nkeynes@102:     if( hook == NULL ) {
nkeynes@102: 	WARN( "Invoked non-existent hook %02X", hook_id );
nkeynes@102:     } else {
nkeynes@102: 	hook(hook_id);
nkeynes@102:     }
nkeynes@102: }
nkeynes@102: 
nkeynes@102: void syscall_repatch_vectors( )
nkeynes@102: {
nkeynes@102:     int i;
nkeynes@102:     for( i=0; i<256; i++ ) {
nkeynes@102: 	if( syscall_hooks[i].hook != NULL &&
nkeynes@102: 	    syscall_hooks[i].vector != 0 ) {
nkeynes@102: 	    sh4_write_long( syscall_hooks[i].vector, 0xFFFFFF00 + i );
nkeynes@102: 	}
nkeynes@102:     }
nkeynes@102: }