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"
34 char bootstrap_magic[32] = "SEGA SEGAKATANA SEGA ENTERPRISES";
35 char iso_magic[6] = "\001CD001";
36 char *file_loader_extensions[][2] = {
37 { "sbi", "Self Boot Inducer" },
38 { "bin", "SH4 Bin file" },
41 #define CDI_V2 0x80000004
42 #define CDI_V3 0x80000005
44 gboolean file_load_elf_fd( const gchar *filename, int fd );
47 gboolean file_load_magic( const gchar *filename )
51 gboolean result = TRUE;
53 int fd = open( filename, O_RDONLY );
61 if( read( fd, buf, 32 ) != 32 ) {
62 ERROR( "Unable to read from file '%s'", filename );
66 if( memcmp( buf, bootstrap_magic, 32 ) == 0 ) {
67 /* we have a DC bootstrap */
68 if( st.st_size == BOOTSTRAP_SIZE ) {
69 sh4ptr_t load = mem_get_region( BOOTSTRAP_LOAD_ADDR );
70 lseek( fd, 0, SEEK_SET );
71 read( fd, load, BOOTSTRAP_SIZE );
72 bootstrap_dump( load, TRUE );
73 dreamcast_program_loaded( filename, BOOTSTRAP_LOAD_ADDR + 0x300 );
75 /* look for a valid ISO9660 header */
76 lseek( fd, 32768, SEEK_SET );
78 if( memcmp( buf, iso_magic, 6 ) == 0 ) {
80 WARN( "ISO images not supported yet" );
83 } else if( memcmp( buf, "PK\x03\x04", 4 ) == 0 ) {
84 /* ZIP file, aka SBI file */
85 WARN( "SBI files not supported yet" );
87 } else if( memcmp( buf, DREAMCAST_SAVE_MAGIC, 16 ) == 0 ) {
89 result = (dreamcast_load_state( filename )==0);
90 } else if( buf[0] == 0x7F && buf[1] == 'E' &&
91 buf[2] == 'L' && buf[3] == 'F' ) {
93 lseek( fd, 0, SEEK_SET );
94 result = file_load_elf_fd( filename, fd );
102 void file_load_postload( const gchar *filename, int pc )
104 gchar *bootstrap_file = lxdream_get_global_config_path_value(CONFIG_BOOTSTRAP);
105 if( bootstrap_file != NULL && bootstrap_file[0] != '\0' ) {
106 /* Load in a bootstrap before the binary, to initialize everything
109 if( mem_load_block( bootstrap_file, BOOTSTRAP_LOAD_ADDR, BOOTSTRAP_SIZE ) == 0 ) {
110 dreamcast_program_loaded( filename, BOOTSTRAP_LOAD_ADDR+0x300 );
111 g_free(bootstrap_file);
115 dreamcast_program_loaded( filename, pc );
116 g_free(bootstrap_file);
120 gboolean file_load_binary( const gchar *filename )
122 /* Load the binary itself */
123 if( mem_load_block( filename, BINARY_LOAD_ADDR, -1 ) == 0 ) {
124 file_load_postload( filename, BINARY_LOAD_ADDR );
131 gboolean file_load_elf_fd( const gchar *filename, int fd )
137 if( read( fd, &head, sizeof(head) ) != sizeof(head) )
139 if( head.e_ident[EI_CLASS] != ELFCLASS32 ||
140 head.e_ident[EI_DATA] != ELFDATA2LSB ||
141 head.e_ident[EI_VERSION] != 1 ||
142 head.e_type != ET_EXEC ||
143 head.e_machine != EM_SH ||
144 head.e_version != 1 ) {
145 ERROR( "File is not an SH4 ELF executable file" );
149 /* Program headers */
150 for( i=0; i<head.e_phnum; i++ ) {
151 lseek( fd, head.e_phoff + i*head.e_phentsize, SEEK_SET );
152 read( fd, &phdr, sizeof(phdr) );
153 if( phdr.p_type == PT_LOAD ) {
154 lseek( fd, phdr.p_offset, SEEK_SET );
155 sh4ptr_t target = mem_get_region( phdr.p_vaddr );
156 read( fd, target, phdr.p_filesz );
157 if( phdr.p_memsz > phdr.p_filesz ) {
158 memset( target + phdr.p_filesz, 0, phdr.p_memsz - phdr.p_filesz );
160 INFO( "Loaded %d bytes to %08X", phdr.p_filesz, phdr.p_vaddr );
164 file_load_postload( filename, head.e_entry );
.