1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/syscall.c	Mon Mar 13 12:38:39 2006 +0000
     1.3 @@ -0,0 +1,68 @@
     1.4 +/**
     1.5 + * $Id: syscall.c,v 1.1 2006-03-13 12:38:34 nkeynes Exp $
     1.6 + * 
     1.7 + * Routines to add hook functions that are callable from the SH4
     1.8 + *
     1.9 + * Copyright (c) 2005 Nathan Keynes.
    1.10 + *
    1.11 + * This program is free software; you can redistribute it and/or modify
    1.12 + * it under the terms of the GNU General Public License as published by
    1.13 + * the Free Software Foundation; either version 2 of the License, or
    1.14 + * (at your option) any later version.
    1.15 + *
    1.16 + * This program is distributed in the hope that it will be useful,
    1.17 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
    1.18 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    1.19 + * GNU General Public License for more details.
    1.20 + */
    1.21 +
    1.22 +#include "dream.h"
    1.23 +#include "mem.h"
    1.24 +#include "syscall.h"
    1.25 +#include "sh4/sh4core.h"
    1.26 +
    1.27 +
    1.28 +struct syscall_hook {
    1.29 +    syscall_hook_func_t hook;
    1.30 +    sh4addr_t vector;
    1.31 +} syscall_hooks[256];
    1.32 +
    1.33 +void syscall_add_hook( uint32_t hook_id, syscall_hook_func_t hook ) 
    1.34 +{
    1.35 +    hook_id &= 0xFF;
    1.36 +    if( syscall_hooks[hook_id].hook != NULL )
    1.37 +	WARN( "Overwriting existing hook %02X", hook_id );
    1.38 +    syscall_hooks[hook_id].hook = hook;
    1.39 +    syscall_hooks[hook_id].vector = 0;
    1.40 +}
    1.41 +
    1.42 +void syscall_add_hook_vector( uint32_t hook_id, uint32_t vector_addr,
    1.43 +			      syscall_hook_func_t hook )
    1.44 +{
    1.45 +    hook_id &= 0xFF;
    1.46 +    syscall_add_hook( hook_id, hook );
    1.47 +    syscall_hooks[hook_id].vector = vector_addr;
    1.48 +    sh4_write_long( vector_addr, 0xFFFFFF00 + hook_id );
    1.49 +}
    1.50 +
    1.51 +void syscall_invoke( uint32_t hook_id )
    1.52 +{
    1.53 +    hook_id &= 0xFF;
    1.54 +    syscall_hook_func_t hook = syscall_hooks[hook_id].hook;
    1.55 +    if( hook == NULL ) {
    1.56 +	WARN( "Invoked non-existent hook %02X", hook_id );
    1.57 +    } else {
    1.58 +	hook(hook_id);
    1.59 +    }
    1.60 +}
    1.61 +
    1.62 +void syscall_repatch_vectors( )
    1.63 +{
    1.64 +    int i;
    1.65 +    for( i=0; i<256; i++ ) {
    1.66 +	if( syscall_hooks[i].hook != NULL &&
    1.67 +	    syscall_hooks[i].vector != 0 ) {
    1.68 +	    sh4_write_long( syscall_hooks[i].vector, 0xFFFFFF00 + i );
    1.69 +	}
    1.70 +    }
    1.71 +}