4 * DC-load syscall implementation.
6 * Copyright (c) 2005 Nathan Keynes.
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.
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.
25 #include "dreamcast.h"
43 #define SYS_ASSIGNWRKMEM 14
45 #define SYS_OPENDIR 16
46 #define SYS_CLOSEDIR 17
47 #define SYS_READDIR 18
48 #define SYS_GETHOSTINFO 19
50 #define SYS_MAGIC 0xDEADBEEF
51 #define SYS_MAGIC_ADDR 0x8c004004
52 #define SYSCALL_ADDR 0x8c004008
54 static gboolean dcload_allow_unsafe = FALSE;
56 void dcload_set_allow_unsafe( gboolean allow )
58 dcload_allow_unsafe = allow;
61 #define MAX_OPEN_FDS 16
63 * Mapping from emulator fd to real fd (so we can limit read/write
64 * to only fds we've explicitly granted access to).
66 int open_fds[MAX_OPEN_FDS];
71 for( i=0; i<MAX_OPEN_FDS; i++ ) {
72 if( open_fds[i] == -1 ) {
79 void dcload_syscall( uint32_t syscall_id )
81 // uint32_t syscall = sh4r.r[4];
86 if( fd < 0 || fd >= MAX_OPEN_FDS || open_fds[fd] == -1 ) {
89 sh4ptr_t buf = mem_get_region( sh4r.r[6] );
90 int length = sh4r.r[7];
91 sh4r.r[0] = read( open_fds[fd], buf, length );
96 if( fd < 0 || fd >= MAX_OPEN_FDS || open_fds[fd] == -1 ) {
99 sh4ptr_t buf = mem_get_region( sh4r.r[6] );
100 int length = sh4r.r[7];
101 sh4r.r[0] = write( open_fds[fd], buf, length );
106 if( fd < 0 || fd >= MAX_OPEN_FDS || open_fds[fd] == -1 ) {
109 sh4r.r[0] = lseek( open_fds[fd], sh4r.r[6], sh4r.r[7] );
113 /* Secure access only */
115 if( dcload_allow_unsafe ) {
116 fd = dcload_alloc_fd();
120 char *filename = (char *)mem_get_region( sh4r.r[5] );
121 int realfd = open( filename, sh4r.r[6] );
122 open_fds[fd] = realfd;
126 ERROR( "Denying access to local filesystem" );
131 if( dcload_allow_unsafe ) {
133 if( fd < 0 || fd >= MAX_OPEN_FDS || open_fds[fd] == -1 ) {
136 if( open_fds[fd] > 2 ) {
137 sh4r.r[0] = close( open_fds[fd] );
139 /* Don't actually close real fds 0-2 */
147 if( dcload_allow_unsafe ) {
148 dreamcast_shutdown();
159 void dcload_install()
161 memset( &open_fds, -1, sizeof(open_fds) );
165 syscall_add_hook_vector( 0xF0, SYSCALL_ADDR, dcload_syscall );
166 mem_write_long( SYS_MAGIC_ADDR, SYS_MAGIC );
.