nkeynes@102 | 1 | /**
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nkeynes@102 | 2 | * $Id: syscall.c,v 1.1 2006-03-13 12:38:34 nkeynes Exp $
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nkeynes@102 | 3 | *
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nkeynes@102 | 4 | * Routines to add hook functions that are callable from the SH4
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nkeynes@102 | 5 | *
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nkeynes@102 | 6 | * Copyright (c) 2005 Nathan Keynes.
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nkeynes@102 | 7 | *
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nkeynes@102 | 8 | * This program is free software; you can redistribute it and/or modify
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nkeynes@102 | 9 | * it under the terms of the GNU General Public License as published by
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nkeynes@102 | 10 | * the Free Software Foundation; either version 2 of the License, or
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nkeynes@102 | 11 | * (at your option) any later version.
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nkeynes@102 | 12 | *
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nkeynes@102 | 13 | * This program is distributed in the hope that it will be useful,
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nkeynes@102 | 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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nkeynes@102 | 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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nkeynes@102 | 16 | * GNU General Public License for more details.
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nkeynes@102 | 17 | */
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nkeynes@102 | 18 |
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nkeynes@102 | 19 | #include "dream.h"
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nkeynes@102 | 20 | #include "mem.h"
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nkeynes@102 | 21 | #include "syscall.h"
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nkeynes@102 | 22 | #include "sh4/sh4core.h"
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nkeynes@102 | 23 |
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nkeynes@102 | 24 |
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nkeynes@102 | 25 | struct syscall_hook {
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nkeynes@102 | 26 | syscall_hook_func_t hook;
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nkeynes@102 | 27 | sh4addr_t vector;
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nkeynes@102 | 28 | } syscall_hooks[256];
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nkeynes@102 | 29 |
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nkeynes@102 | 30 | void syscall_add_hook( uint32_t hook_id, syscall_hook_func_t hook )
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nkeynes@102 | 31 | {
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nkeynes@102 | 32 | hook_id &= 0xFF;
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nkeynes@102 | 33 | if( syscall_hooks[hook_id].hook != NULL )
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nkeynes@102 | 34 | WARN( "Overwriting existing hook %02X", hook_id );
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nkeynes@102 | 35 | syscall_hooks[hook_id].hook = hook;
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nkeynes@102 | 36 | syscall_hooks[hook_id].vector = 0;
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nkeynes@102 | 37 | }
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nkeynes@102 | 38 |
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nkeynes@102 | 39 | void syscall_add_hook_vector( uint32_t hook_id, uint32_t vector_addr,
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nkeynes@102 | 40 | syscall_hook_func_t hook )
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nkeynes@102 | 41 | {
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nkeynes@102 | 42 | hook_id &= 0xFF;
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nkeynes@102 | 43 | syscall_add_hook( hook_id, hook );
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nkeynes@102 | 44 | syscall_hooks[hook_id].vector = vector_addr;
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nkeynes@102 | 45 | sh4_write_long( vector_addr, 0xFFFFFF00 + hook_id );
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nkeynes@102 | 46 | }
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nkeynes@102 | 47 |
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nkeynes@102 | 48 | void syscall_invoke( uint32_t hook_id )
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nkeynes@102 | 49 | {
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nkeynes@102 | 50 | hook_id &= 0xFF;
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nkeynes@102 | 51 | syscall_hook_func_t hook = syscall_hooks[hook_id].hook;
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nkeynes@102 | 52 | if( hook == NULL ) {
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nkeynes@102 | 53 | WARN( "Invoked non-existent hook %02X", hook_id );
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nkeynes@102 | 54 | } else {
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nkeynes@102 | 55 | hook(hook_id);
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nkeynes@102 | 56 | }
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nkeynes@102 | 57 | }
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nkeynes@102 | 58 |
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nkeynes@102 | 59 | void syscall_repatch_vectors( )
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nkeynes@102 | 60 | {
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nkeynes@102 | 61 | int i;
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nkeynes@102 | 62 | for( i=0; i<256; i++ ) {
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nkeynes@102 | 63 | if( syscall_hooks[i].hook != NULL &&
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nkeynes@102 | 64 | syscall_hooks[i].vector != 0 ) {
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nkeynes@102 | 65 | sh4_write_long( syscall_hooks[i].vector, 0xFFFFFF00 + i );
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nkeynes@102 | 66 | }
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nkeynes@102 | 67 | }
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nkeynes@102 | 68 | }
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