2 * $Id: loader.c,v 1.22 2007-11-08 11:54:16 nkeynes Exp $
4 * File loading routines, mostly for loading demos without going through the
5 * whole procedure of making a CD image for them.
7 * Copyright (c) 2005 Nathan Keynes.
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
29 #include "bootstrap.h"
30 #include "dreamcast.h"
35 // FIXME: This probably shouldn't be here
36 #include <gui/gtkui.h>
38 char bootstrap_magic[32] = "SEGA SEGAKATANA SEGA ENTERPRISES";
39 char iso_magic[6] = "\001CD001";
40 char *file_loader_extensions[][2] = {
41 { "sbi", "Self Boot Inducer" },
42 { "bin", "SH4 Bin file" },
45 #define BOOTSTRAP_LOAD_ADDR 0x8C008000
46 #define BOOTSTRAP_SIZE 32768
48 #define BINARY_LOAD_ADDR 0x8C010000
50 #define CDI_V2 0x80000004
51 #define CDI_V3 0x80000005
53 gboolean file_load_elf_fd( int fd );
56 gboolean file_load_magic( const gchar *filename )
60 gboolean result = TRUE;
62 int fd = open( filename, O_RDONLY );
70 if( read( fd, buf, 32 ) != 32 ) {
71 ERROR( "Unable to read from file '%s'", filename );
75 if( memcmp( buf, bootstrap_magic, 32 ) == 0 ) {
76 /* we have a DC bootstrap */
77 if( st.st_size == BOOTSTRAP_SIZE ) {
78 sh4ptr_t load = mem_get_region( BOOTSTRAP_LOAD_ADDR );
79 lseek( fd, 0, SEEK_SET );
80 read( fd, load, BOOTSTRAP_SIZE );
81 bootstrap_dump( load, TRUE );
82 sh4_set_pc( BOOTSTRAP_LOAD_ADDR + 0x300 );
85 /* look for a valid ISO9660 header */
86 lseek( fd, 32768, SEEK_SET );
88 if( memcmp( buf, iso_magic, 6 ) == 0 ) {
90 INFO( "Loading ISO9660 filesystem from '%s'",
94 } else if( memcmp( buf, "PK\x03\x04", 4 ) == 0 ) {
95 /* ZIP file, aka SBI file */
96 WARN( "SBI files not supported yet" );
98 } else if( memcmp( buf, DREAMCAST_SAVE_MAGIC, 16 ) == 0 ) {
100 result = (dreamcast_load_state( filename )==0);
101 } else if( buf[0] == 0x7F && buf[1] == 'E' &&
102 buf[2] == 'L' && buf[3] == 'F' ) {
104 lseek( fd, 0, SEEK_SET );
105 result = file_load_elf_fd( fd );
113 void file_load_postload( int pc )
115 const gchar *bootstrap_file = lxdream_get_config_value(CONFIG_BOOTSTRAP);
116 if( bootstrap_file != NULL ) {
117 /* Load in a bootstrap before the binary, to initialize everything
120 if( mem_load_block( bootstrap_file, BOOTSTRAP_LOAD_ADDR, BOOTSTRAP_SIZE ) != 0 ) {
121 /* Try it without the bootstrap */
124 sh4_set_pc( BOOTSTRAP_LOAD_ADDR + 0x300 );
135 gboolean file_load_binary( const gchar *filename )
137 /* Load the binary itself */
138 if( mem_load_block( filename, BINARY_LOAD_ADDR, -1 ) == 0 ) {
139 file_load_postload( BINARY_LOAD_ADDR );
146 gboolean file_load_elf_fd( int fd )
152 if( read( fd, &head, sizeof(head) ) != sizeof(head) )
154 if( head.e_ident[EI_CLASS] != ELFCLASS32 ||
155 head.e_ident[EI_DATA] != ELFDATA2LSB ||
156 head.e_ident[EI_VERSION] != 1 ||
157 head.e_type != ET_EXEC ||
158 head.e_machine != EM_SH ||
159 head.e_version != 1 ) {
160 ERROR( "File is not an SH4 ELF executable file" );
164 /* Program headers */
165 for( i=0; i<head.e_phnum; i++ ) {
166 lseek( fd, head.e_phoff + i*head.e_phentsize, SEEK_SET );
167 read( fd, &phdr, sizeof(phdr) );
168 if( phdr.p_type == PT_LOAD ) {
169 lseek( fd, phdr.p_offset, SEEK_SET );
170 sh4ptr_t target = mem_get_region( phdr.p_vaddr );
171 read( fd, target, phdr.p_filesz );
172 if( phdr.p_memsz > phdr.p_filesz ) {
173 memset( target + phdr.p_filesz, 0, phdr.p_memsz - phdr.p_filesz );
175 INFO( "Loaded %d bytes to %08X", phdr.p_filesz, phdr.p_vaddr );
179 file_load_postload( head.e_entry );
.