filename | src/dcload.c |
changeset | 209:ff67a7b9aa17 |
prev | 183:5938ecc01dc8 |
next | 422:61a0598e07ff |
author | nkeynes |
date | Mon Jan 29 11:24:44 2007 +0000 (17 years ago) |
permissions | -rw-r--r-- |
last change | Get render size from the tile segment array Set near clip to just 0 rather than scanning the scene Fixup modulate RGB to force fragment alpha to 1.0 Add some debugging fprintfs |
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nkeynes@102 | 1 | /** |
nkeynes@209 | 2 | * $Id: dcload.c,v 1.6 2006-08-07 13:18:16 nkeynes Exp $ |
nkeynes@102 | 3 | * |
nkeynes@102 | 4 | * DC-load syscall implementation. |
nkeynes@102 | 5 | * |
nkeynes@102 | 6 | * Copyright (c) 2005 Nathan Keynes. |
nkeynes@102 | 7 | * |
nkeynes@102 | 8 | * This program is free software; you can redistribute it and/or modify |
nkeynes@102 | 9 | * it under the terms of the GNU General Public License as published by |
nkeynes@102 | 10 | * the Free Software Foundation; either version 2 of the License, or |
nkeynes@102 | 11 | * (at your option) any later version. |
nkeynes@102 | 12 | * |
nkeynes@102 | 13 | * This program is distributed in the hope that it will be useful, |
nkeynes@102 | 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
nkeynes@102 | 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
nkeynes@102 | 16 | * GNU General Public License for more details. |
nkeynes@102 | 17 | */ |
nkeynes@102 | 18 | |
nkeynes@102 | 19 | #include <stdio.h> |
nkeynes@102 | 20 | #include "dream.h" |
nkeynes@182 | 21 | #include "dreamcast.h" |
nkeynes@102 | 22 | #include "mem.h" |
nkeynes@102 | 23 | #include "syscall.h" |
nkeynes@102 | 24 | #include "sh4/sh4core.h" |
nkeynes@102 | 25 | |
nkeynes@102 | 26 | #define SYS_READ 0 |
nkeynes@102 | 27 | #define SYS_WRITE 1 |
nkeynes@102 | 28 | #define SYS_OPEN 2 |
nkeynes@102 | 29 | #define SYS_CLOSE 3 |
nkeynes@102 | 30 | #define SYS_CREAT 4 |
nkeynes@102 | 31 | #define SYS_LINK 5 |
nkeynes@102 | 32 | #define SYS_UNLINK 6 |
nkeynes@102 | 33 | #define SYS_CHDIR 7 |
nkeynes@102 | 34 | #define SYS_CHMOD 8 |
nkeynes@102 | 35 | #define SYS_LSEEK 9 |
nkeynes@102 | 36 | #define SYS_FSTAT 10 |
nkeynes@102 | 37 | #define SYS_TIME 11 |
nkeynes@102 | 38 | #define SYS_STAT 12 |
nkeynes@102 | 39 | #define SYS_UTIME 13 |
nkeynes@102 | 40 | #define SYS_ASSIGNWRKMEM 14 |
nkeynes@102 | 41 | #define SYS_EXIT 15 |
nkeynes@102 | 42 | #define SYS_OPENDIR 16 |
nkeynes@102 | 43 | #define SYS_CLOSEDIR 17 |
nkeynes@102 | 44 | #define SYS_READDIR 18 |
nkeynes@102 | 45 | #define SYS_GETHOSTINFO 19 |
nkeynes@102 | 46 | |
nkeynes@102 | 47 | #define SYS_MAGIC 0xDEADBEEF |
nkeynes@102 | 48 | #define SYS_MAGIC_ADDR 0x8c004004 |
nkeynes@102 | 49 | #define SYSCALL_ADDR 0x8c004008 |
nkeynes@102 | 50 | |
nkeynes@209 | 51 | static gboolean dcload_allow_unsafe = FALSE; |
nkeynes@182 | 52 | |
nkeynes@209 | 53 | void dcload_set_allow_unsafe( gboolean allow ) |
nkeynes@182 | 54 | { |
nkeynes@209 | 55 | dcload_allow_unsafe = allow; |
nkeynes@209 | 56 | } |
nkeynes@209 | 57 | |
nkeynes@209 | 58 | #define MAX_OPEN_FDS 16 |
nkeynes@209 | 59 | /** |
nkeynes@209 | 60 | * Mapping from emulator fd to real fd (so we can limit read/write |
nkeynes@209 | 61 | * to only fds we've explicitly granted access to). |
nkeynes@209 | 62 | */ |
nkeynes@209 | 63 | int open_fds[MAX_OPEN_FDS]; |
nkeynes@209 | 64 | |
nkeynes@209 | 65 | int dcload_alloc_fd() |
nkeynes@209 | 66 | { |
nkeynes@209 | 67 | int i; |
nkeynes@209 | 68 | for( i=0; i<MAX_OPEN_FDS; i++ ) { |
nkeynes@209 | 69 | if( open_fds[i] == -1 ) { |
nkeynes@209 | 70 | return i; |
nkeynes@209 | 71 | } |
nkeynes@209 | 72 | } |
nkeynes@209 | 73 | return -1; |
nkeynes@182 | 74 | } |
nkeynes@182 | 75 | |
nkeynes@102 | 76 | void dcload_syscall( uint32_t syscall_id ) |
nkeynes@102 | 77 | { |
nkeynes@102 | 78 | uint32_t syscall = sh4r.r[4]; |
nkeynes@209 | 79 | int fd; |
nkeynes@102 | 80 | switch( sh4r.r[4] ) { |
nkeynes@102 | 81 | case SYS_READ: |
nkeynes@209 | 82 | fd = sh4r.r[5]; |
nkeynes@209 | 83 | if( fd < 0 || fd >= MAX_OPEN_FDS || open_fds[fd] == -1 ) { |
nkeynes@209 | 84 | sh4r.r[0] = -1; |
nkeynes@209 | 85 | } else { |
nkeynes@102 | 86 | char *buf = mem_get_region( sh4r.r[6] ); |
nkeynes@102 | 87 | int length = sh4r.r[7]; |
nkeynes@209 | 88 | sh4r.r[0] = read( open_fds[fd], buf, length ); |
nkeynes@209 | 89 | } |
nkeynes@209 | 90 | break; |
nkeynes@209 | 91 | case SYS_WRITE: |
nkeynes@209 | 92 | fd = sh4r.r[5]; |
nkeynes@209 | 93 | if( fd < 0 || fd >= MAX_OPEN_FDS || open_fds[fd] == -1 ) { |
nkeynes@209 | 94 | sh4r.r[0] = -1; |
nkeynes@102 | 95 | } else { |
nkeynes@209 | 96 | char *buf = mem_get_region( sh4r.r[6] ); |
nkeynes@209 | 97 | int length = sh4r.r[7]; |
nkeynes@209 | 98 | sh4r.r[0] = write( open_fds[fd], buf, length ); |
nkeynes@209 | 99 | } |
nkeynes@209 | 100 | break; |
nkeynes@209 | 101 | case SYS_LSEEK: |
nkeynes@209 | 102 | fd = sh4r.r[5]; |
nkeynes@209 | 103 | if( fd < 0 || fd >= MAX_OPEN_FDS || open_fds[fd] == -1 ) { |
nkeynes@209 | 104 | sh4r.r[0] = -1; |
nkeynes@209 | 105 | } else { |
nkeynes@209 | 106 | sh4r.r[0] = lseek( open_fds[fd], sh4r.r[6], sh4r.r[7] ); |
nkeynes@209 | 107 | } |
nkeynes@209 | 108 | break; |
nkeynes@209 | 109 | |
nkeynes@209 | 110 | /* Secure access only */ |
nkeynes@209 | 111 | case SYS_OPEN: |
nkeynes@209 | 112 | if( dcload_allow_unsafe ) { |
nkeynes@209 | 113 | fd = dcload_alloc_fd(); |
nkeynes@209 | 114 | if( fd == -1 ) { |
nkeynes@209 | 115 | sh4r.r[0] = -1; |
nkeynes@209 | 116 | } else { |
nkeynes@209 | 117 | char *filename = mem_get_region( sh4r.r[5] ); |
nkeynes@209 | 118 | int realfd = open( filename, sh4r.r[6] ); |
nkeynes@209 | 119 | open_fds[fd] = realfd; |
nkeynes@209 | 120 | sh4r.r[0] = realfd; |
nkeynes@209 | 121 | } |
nkeynes@209 | 122 | } else { |
nkeynes@209 | 123 | ERROR( "Denying access to local filesystem" ); |
nkeynes@102 | 124 | sh4r.r[0] = -1; |
nkeynes@102 | 125 | } |
nkeynes@102 | 126 | break; |
nkeynes@209 | 127 | case SYS_CLOSE: |
nkeynes@209 | 128 | if( dcload_allow_unsafe ) { |
nkeynes@209 | 129 | fd = sh4r.r[5]; |
nkeynes@209 | 130 | if( fd < 0 || fd >= MAX_OPEN_FDS || open_fds[fd] == -1 ) { |
nkeynes@209 | 131 | sh4r.r[0] = -1; |
nkeynes@209 | 132 | } else { |
nkeynes@209 | 133 | if( open_fds[fd] > 2 ) { |
nkeynes@209 | 134 | sh4r.r[0] = close( open_fds[fd] ); |
nkeynes@209 | 135 | } else { |
nkeynes@209 | 136 | /* Don't actually close real fds 0-2 */ |
nkeynes@209 | 137 | sh4r.r[0] = 0; |
nkeynes@209 | 138 | } |
nkeynes@209 | 139 | open_fds[fd] = -1; |
nkeynes@209 | 140 | } |
nkeynes@102 | 141 | } |
nkeynes@102 | 142 | break; |
nkeynes@102 | 143 | case SYS_EXIT: |
nkeynes@209 | 144 | if( dcload_allow_unsafe ) { |
nkeynes@183 | 145 | exit( sh4r.r[5] ); |
nkeynes@209 | 146 | } else { |
nkeynes@182 | 147 | dreamcast_stop(); |
nkeynes@209 | 148 | } |
nkeynes@102 | 149 | default: |
nkeynes@102 | 150 | sh4r.r[0] = -1; |
nkeynes@102 | 151 | } |
nkeynes@102 | 152 | |
nkeynes@102 | 153 | } |
nkeynes@102 | 154 | |
nkeynes@102 | 155 | void dcload_install() |
nkeynes@102 | 156 | { |
nkeynes@209 | 157 | memset( &open_fds, -1, sizeof(open_fds) ); |
nkeynes@209 | 158 | open_fds[0] = 0; |
nkeynes@209 | 159 | open_fds[1] = 1; |
nkeynes@209 | 160 | open_fds[2] = 2; |
nkeynes@102 | 161 | syscall_add_hook_vector( 0xF0, SYSCALL_ADDR, dcload_syscall ); |
nkeynes@102 | 162 | sh4_write_long( SYS_MAGIC_ADDR, SYS_MAGIC ); |
nkeynes@102 | 163 | } |
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