lxdream 0.9.1| filename | src/syscall.c |
| changeset | 102:844a3f2a76ff |
| next | 561:533f6b478071 |
| next | 586:2a3ba82cf243 |
| author | nkeynes |
| date | Tue May 02 14:09:11 2006 +0000 (17 years ago) |
| permissions | -rw-r--r-- |
| last change | Add packet.h Implement read toc, request sense, test ready commands. Fix failure to clear error status on new command |
| view | annotate | diff | log | raw |
1 /**
2 * $Id: syscall.c,v 1.1 2006-03-13 12:38:34 nkeynes Exp $
3 *
4 * Routines to add hook functions that are callable from the SH4
5 *
6 * Copyright (c) 2005 Nathan Keynes.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 */
19 #include "dream.h"
20 #include "mem.h"
21 #include "syscall.h"
22 #include "sh4/sh4core.h"
25 struct syscall_hook {
26 syscall_hook_func_t hook;
27 sh4addr_t vector;
28 } syscall_hooks[256];
30 void syscall_add_hook( uint32_t hook_id, syscall_hook_func_t hook )
31 {
32 hook_id &= 0xFF;
33 if( syscall_hooks[hook_id].hook != NULL )
34 WARN( "Overwriting existing hook %02X", hook_id );
35 syscall_hooks[hook_id].hook = hook;
36 syscall_hooks[hook_id].vector = 0;
37 }
39 void syscall_add_hook_vector( uint32_t hook_id, uint32_t vector_addr,
40 syscall_hook_func_t hook )
41 {
42 hook_id &= 0xFF;
43 syscall_add_hook( hook_id, hook );
44 syscall_hooks[hook_id].vector = vector_addr;
45 sh4_write_long( vector_addr, 0xFFFFFF00 + hook_id );
46 }
48 void syscall_invoke( uint32_t hook_id )
49 {
50 hook_id &= 0xFF;
51 syscall_hook_func_t hook = syscall_hooks[hook_id].hook;
52 if( hook == NULL ) {
53 WARN( "Invoked non-existent hook %02X", hook_id );
54 } else {
55 hook(hook_id);
56 }
57 }
59 void syscall_repatch_vectors( )
60 {
61 int i;
62 for( i=0; i<256; i++ ) {
63 if( syscall_hooks[i].hook != NULL &&
64 syscall_hooks[i].vector != 0 ) {
65 sh4_write_long( syscall_hooks[i].vector, 0xFFFFFF00 + i );
66 }
67 }
68 }
.