nkeynes@102 | 1 | /**
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nkeynes@586 | 2 | * $Id$
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nkeynes@102 | 3 | *
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nkeynes@102 | 4 | * DC-load syscall implementation.
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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 <stdio.h>
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nkeynes@422 | 20 | #include <unistd.h>
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nkeynes@422 | 21 | #include <fcntl.h>
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nkeynes@422 | 22 |
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nkeynes@102 | 23 | #include "dream.h"
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nkeynes@422 | 24 | #include "mem.h"
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nkeynes@182 | 25 | #include "dreamcast.h"
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nkeynes@102 | 26 | #include "syscall.h"
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nkeynes@586 | 27 | #include "sh4/sh4.h"
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nkeynes@102 | 28 |
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nkeynes@102 | 29 | #define SYS_READ 0
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nkeynes@102 | 30 | #define SYS_WRITE 1
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nkeynes@102 | 31 | #define SYS_OPEN 2
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nkeynes@102 | 32 | #define SYS_CLOSE 3
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nkeynes@102 | 33 | #define SYS_CREAT 4
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nkeynes@102 | 34 | #define SYS_LINK 5
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nkeynes@102 | 35 | #define SYS_UNLINK 6
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nkeynes@102 | 36 | #define SYS_CHDIR 7
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nkeynes@102 | 37 | #define SYS_CHMOD 8
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nkeynes@102 | 38 | #define SYS_LSEEK 9
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nkeynes@102 | 39 | #define SYS_FSTAT 10
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nkeynes@102 | 40 | #define SYS_TIME 11
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nkeynes@102 | 41 | #define SYS_STAT 12
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nkeynes@102 | 42 | #define SYS_UTIME 13
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nkeynes@102 | 43 | #define SYS_ASSIGNWRKMEM 14
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nkeynes@102 | 44 | #define SYS_EXIT 15
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nkeynes@102 | 45 | #define SYS_OPENDIR 16
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nkeynes@102 | 46 | #define SYS_CLOSEDIR 17
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nkeynes@102 | 47 | #define SYS_READDIR 18
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nkeynes@102 | 48 | #define SYS_GETHOSTINFO 19
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nkeynes@102 | 49 |
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nkeynes@102 | 50 | #define SYS_MAGIC 0xDEADBEEF
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nkeynes@102 | 51 | #define SYS_MAGIC_ADDR 0x8c004004
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nkeynes@102 | 52 | #define SYSCALL_ADDR 0x8c004008
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nkeynes@102 | 53 |
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nkeynes@209 | 54 | static gboolean dcload_allow_unsafe = FALSE;
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nkeynes@182 | 55 |
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nkeynes@209 | 56 | void dcload_set_allow_unsafe( gboolean allow )
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nkeynes@182 | 57 | {
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nkeynes@209 | 58 | dcload_allow_unsafe = allow;
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nkeynes@209 | 59 | }
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nkeynes@209 | 60 |
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nkeynes@209 | 61 | #define MAX_OPEN_FDS 16
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nkeynes@209 | 62 | /**
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nkeynes@209 | 63 | * Mapping from emulator fd to real fd (so we can limit read/write
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nkeynes@209 | 64 | * to only fds we've explicitly granted access to).
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nkeynes@209 | 65 | */
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nkeynes@209 | 66 | int open_fds[MAX_OPEN_FDS];
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nkeynes@209 | 67 |
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nkeynes@209 | 68 | int dcload_alloc_fd()
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nkeynes@209 | 69 | {
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nkeynes@209 | 70 | int i;
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nkeynes@209 | 71 | for( i=0; i<MAX_OPEN_FDS; i++ ) {
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nkeynes@209 | 72 | if( open_fds[i] == -1 ) {
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nkeynes@209 | 73 | return i;
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nkeynes@209 | 74 | }
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nkeynes@209 | 75 | }
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nkeynes@209 | 76 | return -1;
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nkeynes@182 | 77 | }
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nkeynes@182 | 78 |
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nkeynes@102 | 79 | void dcload_syscall( uint32_t syscall_id )
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nkeynes@102 | 80 | {
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nkeynes@422 | 81 | // uint32_t syscall = sh4r.r[4];
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nkeynes@209 | 82 | int fd;
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nkeynes@102 | 83 | switch( sh4r.r[4] ) {
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nkeynes@102 | 84 | case SYS_READ:
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nkeynes@209 | 85 | fd = sh4r.r[5];
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nkeynes@209 | 86 | if( fd < 0 || fd >= MAX_OPEN_FDS || open_fds[fd] == -1 ) {
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nkeynes@209 | 87 | sh4r.r[0] = -1;
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nkeynes@209 | 88 | } else {
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nkeynes@502 | 89 | sh4ptr_t buf = mem_get_region( sh4r.r[6] );
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nkeynes@102 | 90 | int length = sh4r.r[7];
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nkeynes@209 | 91 | sh4r.r[0] = read( open_fds[fd], buf, length );
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nkeynes@209 | 92 | }
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nkeynes@209 | 93 | break;
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nkeynes@209 | 94 | case SYS_WRITE:
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nkeynes@209 | 95 | fd = sh4r.r[5];
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nkeynes@209 | 96 | if( fd < 0 || fd >= MAX_OPEN_FDS || open_fds[fd] == -1 ) {
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nkeynes@209 | 97 | sh4r.r[0] = -1;
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nkeynes@102 | 98 | } else {
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nkeynes@502 | 99 | sh4ptr_t buf = mem_get_region( sh4r.r[6] );
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nkeynes@209 | 100 | int length = sh4r.r[7];
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nkeynes@209 | 101 | sh4r.r[0] = write( open_fds[fd], buf, length );
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nkeynes@209 | 102 | }
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nkeynes@209 | 103 | break;
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nkeynes@209 | 104 | case SYS_LSEEK:
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nkeynes@209 | 105 | fd = sh4r.r[5];
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nkeynes@209 | 106 | if( fd < 0 || fd >= MAX_OPEN_FDS || open_fds[fd] == -1 ) {
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nkeynes@209 | 107 | sh4r.r[0] = -1;
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nkeynes@209 | 108 | } else {
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nkeynes@209 | 109 | sh4r.r[0] = lseek( open_fds[fd], sh4r.r[6], sh4r.r[7] );
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nkeynes@209 | 110 | }
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nkeynes@209 | 111 | break;
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nkeynes@209 | 112 |
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nkeynes@209 | 113 | /* Secure access only */
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nkeynes@209 | 114 | case SYS_OPEN:
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nkeynes@209 | 115 | if( dcload_allow_unsafe ) {
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nkeynes@209 | 116 | fd = dcload_alloc_fd();
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nkeynes@209 | 117 | if( fd == -1 ) {
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nkeynes@209 | 118 | sh4r.r[0] = -1;
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nkeynes@209 | 119 | } else {
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nkeynes@502 | 120 | char *filename = (char *)mem_get_region( sh4r.r[5] );
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nkeynes@209 | 121 | int realfd = open( filename, sh4r.r[6] );
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nkeynes@209 | 122 | open_fds[fd] = realfd;
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nkeynes@209 | 123 | sh4r.r[0] = realfd;
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nkeynes@209 | 124 | }
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nkeynes@209 | 125 | } else {
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nkeynes@209 | 126 | ERROR( "Denying access to local filesystem" );
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nkeynes@102 | 127 | sh4r.r[0] = -1;
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nkeynes@102 | 128 | }
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nkeynes@102 | 129 | break;
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nkeynes@209 | 130 | case SYS_CLOSE:
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nkeynes@209 | 131 | if( dcload_allow_unsafe ) {
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nkeynes@209 | 132 | fd = sh4r.r[5];
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nkeynes@209 | 133 | if( fd < 0 || fd >= MAX_OPEN_FDS || open_fds[fd] == -1 ) {
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nkeynes@209 | 134 | sh4r.r[0] = -1;
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nkeynes@209 | 135 | } else {
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nkeynes@209 | 136 | if( open_fds[fd] > 2 ) {
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nkeynes@209 | 137 | sh4r.r[0] = close( open_fds[fd] );
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nkeynes@209 | 138 | } else {
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nkeynes@209 | 139 | /* Don't actually close real fds 0-2 */
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nkeynes@209 | 140 | sh4r.r[0] = 0;
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nkeynes@209 | 141 | }
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nkeynes@209 | 142 | open_fds[fd] = -1;
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nkeynes@209 | 143 | }
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nkeynes@102 | 144 | }
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nkeynes@102 | 145 | break;
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nkeynes@102 | 146 | case SYS_EXIT:
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nkeynes@209 | 147 | if( dcload_allow_unsafe ) {
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nkeynes@183 | 148 | exit( sh4r.r[5] );
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nkeynes@209 | 149 | } else {
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nkeynes@182 | 150 | dreamcast_stop();
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nkeynes@209 | 151 | }
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nkeynes@102 | 152 | default:
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nkeynes@102 | 153 | sh4r.r[0] = -1;
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nkeynes@102 | 154 | }
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nkeynes@102 | 155 |
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nkeynes@102 | 156 | }
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nkeynes@102 | 157 |
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nkeynes@102 | 158 | void dcload_install()
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nkeynes@102 | 159 | {
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nkeynes@209 | 160 | memset( &open_fds, -1, sizeof(open_fds) );
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nkeynes@209 | 161 | open_fds[0] = 0;
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nkeynes@209 | 162 | open_fds[1] = 1;
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nkeynes@209 | 163 | open_fds[2] = 2;
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nkeynes@102 | 164 | syscall_add_hook_vector( 0xF0, SYSCALL_ADDR, dcload_syscall );
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nkeynes@102 | 165 | sh4_write_long( SYS_MAGIC_ADDR, SYS_MAGIC );
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nkeynes@102 | 166 | }
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