filename | src/loader.c |
changeset | 825:2ac7ceccd775 |
prev | 736:a02d1475ccfd |
next | 1036:af7b0c5905dd |
author | nkeynes |
date | Mon Jun 08 04:12:21 2009 +0000 (14 years ago) |
permissions | -rw-r--r-- |
last change | General cleanup of the GD-rom subsystem - merge gdrom_image_t and gdrom_disc_t - Abstract MMC devices using a lower-level scsi transport - OSX: only look at the whole disc device, and ignore partitions |
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nkeynes@26 | 1 | /** |
nkeynes@561 | 2 | * $Id$ |
nkeynes@1 | 3 | * |
nkeynes@26 | 4 | * File loading routines, mostly for loading demos without going through the |
nkeynes@26 | 5 | * whole procedure of making a CD image for them. |
nkeynes@26 | 6 | * |
nkeynes@26 | 7 | * Copyright (c) 2005 Nathan Keynes. |
nkeynes@26 | 8 | * |
nkeynes@26 | 9 | * This program is free software; you can redistribute it and/or modify |
nkeynes@26 | 10 | * it under the terms of the GNU General Public License as published by |
nkeynes@26 | 11 | * the Free Software Foundation; either version 2 of the License, or |
nkeynes@26 | 12 | * (at your option) any later version. |
nkeynes@26 | 13 | * |
nkeynes@26 | 14 | * This program is distributed in the hope that it will be useful, |
nkeynes@26 | 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
nkeynes@26 | 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
nkeynes@26 | 17 | * GNU General Public License for more details. |
nkeynes@1 | 18 | */ |
nkeynes@1 | 19 | |
nkeynes@481 | 20 | #include <unistd.h> |
nkeynes@1 | 21 | #include <stdio.h> |
nkeynes@736 | 22 | #include <string.h> |
nkeynes@1 | 23 | #include <fcntl.h> |
nkeynes@1 | 24 | #include <sys/stat.h> |
nkeynes@1 | 25 | #include <errno.h> |
nkeynes@1 | 26 | #include <stdint.h> |
nkeynes@105 | 27 | #include <elf.h> |
nkeynes@26 | 28 | #include "mem.h" |
nkeynes@26 | 29 | #include "bootstrap.h" |
nkeynes@171 | 30 | #include "dreamcast.h" |
nkeynes@450 | 31 | #include "config.h" |
nkeynes@427 | 32 | #include "loader.h" |
nkeynes@481 | 33 | |
nkeynes@26 | 34 | char bootstrap_magic[32] = "SEGA SEGAKATANA SEGA ENTERPRISES"; |
nkeynes@1 | 35 | char iso_magic[6] = "\001CD001"; |
nkeynes@26 | 36 | char *file_loader_extensions[][2] = { |
nkeynes@736 | 37 | { "sbi", "Self Boot Inducer" }, |
nkeynes@736 | 38 | { "bin", "SH4 Bin file" }, |
nkeynes@736 | 39 | { NULL, NULL } }; |
nkeynes@26 | 40 | |
nkeynes@26 | 41 | #define BOOTSTRAP_LOAD_ADDR 0x8C008000 |
nkeynes@26 | 42 | #define BOOTSTRAP_SIZE 32768 |
nkeynes@26 | 43 | |
nkeynes@26 | 44 | #define BINARY_LOAD_ADDR 0x8C010000 |
nkeynes@1 | 45 | |
nkeynes@1 | 46 | #define CDI_V2 0x80000004 |
nkeynes@1 | 47 | #define CDI_V3 0x80000005 |
nkeynes@1 | 48 | |
nkeynes@543 | 49 | gboolean file_load_elf_fd( const gchar *filename, int fd ); |
nkeynes@427 | 50 | |
nkeynes@427 | 51 | |
nkeynes@26 | 52 | gboolean file_load_magic( const gchar *filename ) |
nkeynes@1 | 53 | { |
nkeynes@1 | 54 | char buf[32]; |
nkeynes@1 | 55 | struct stat st; |
nkeynes@446 | 56 | gboolean result = TRUE; |
nkeynes@736 | 57 | |
nkeynes@1 | 58 | int fd = open( filename, O_RDONLY ); |
nkeynes@1 | 59 | if( fd == -1 ) { |
nkeynes@26 | 60 | return FALSE; |
nkeynes@1 | 61 | } |
nkeynes@736 | 62 | |
nkeynes@1 | 63 | fstat( fd, &st ); |
nkeynes@736 | 64 | |
nkeynes@1 | 65 | /* begin magic */ |
nkeynes@1 | 66 | if( read( fd, buf, 32 ) != 32 ) { |
nkeynes@1 | 67 | ERROR( "Unable to read from file '%s'", filename ); |
nkeynes@1 | 68 | close(fd); |
nkeynes@26 | 69 | return FALSE; |
nkeynes@1 | 70 | } |
nkeynes@26 | 71 | if( memcmp( buf, bootstrap_magic, 32 ) == 0 ) { |
nkeynes@1 | 72 | /* we have a DC bootstrap */ |
nkeynes@1 | 73 | if( st.st_size == BOOTSTRAP_SIZE ) { |
nkeynes@502 | 74 | sh4ptr_t load = mem_get_region( BOOTSTRAP_LOAD_ADDR ); |
nkeynes@1 | 75 | lseek( fd, 0, SEEK_SET ); |
nkeynes@1 | 76 | read( fd, load, BOOTSTRAP_SIZE ); |
nkeynes@171 | 77 | bootstrap_dump( load, TRUE ); |
nkeynes@736 | 78 | dreamcast_program_loaded( filename, BOOTSTRAP_LOAD_ADDR + 0x300 ); |
nkeynes@1 | 79 | } else { |
nkeynes@1 | 80 | /* look for a valid ISO9660 header */ |
nkeynes@1 | 81 | lseek( fd, 32768, SEEK_SET ); |
nkeynes@1 | 82 | read( fd, buf, 8 ); |
nkeynes@1 | 83 | if( memcmp( buf, iso_magic, 6 ) == 0 ) { |
nkeynes@1 | 84 | /* Alright, got it */ |
nkeynes@1 | 85 | INFO( "Loading ISO9660 filesystem from '%s'", |
nkeynes@736 | 86 | filename ); |
nkeynes@1 | 87 | } |
nkeynes@1 | 88 | } |
nkeynes@26 | 89 | } else if( memcmp( buf, "PK\x03\x04", 4 ) == 0 ) { |
nkeynes@736 | 90 | /* ZIP file, aka SBI file */ |
nkeynes@736 | 91 | WARN( "SBI files not supported yet" ); |
nkeynes@736 | 92 | result = FALSE; |
nkeynes@294 | 93 | } else if( memcmp( buf, DREAMCAST_SAVE_MAGIC, 16 ) == 0 ) { |
nkeynes@736 | 94 | /* Save state */ |
nkeynes@736 | 95 | result = (dreamcast_load_state( filename )==0); |
nkeynes@105 | 96 | } else if( buf[0] == 0x7F && buf[1] == 'E' && |
nkeynes@736 | 97 | buf[2] == 'L' && buf[3] == 'F' ) { |
nkeynes@736 | 98 | /* ELF binary */ |
nkeynes@736 | 99 | lseek( fd, 0, SEEK_SET ); |
nkeynes@736 | 100 | result = file_load_elf_fd( filename, fd ); |
nkeynes@1 | 101 | } else { |
nkeynes@736 | 102 | result = FALSE; |
nkeynes@446 | 103 | } |
nkeynes@1 | 104 | close(fd); |
nkeynes@446 | 105 | return result; |
nkeynes@1 | 106 | } |
nkeynes@19 | 107 | |
nkeynes@543 | 108 | void file_load_postload( const gchar *filename, int pc ) |
nkeynes@110 | 109 | { |
nkeynes@450 | 110 | const gchar *bootstrap_file = lxdream_get_config_value(CONFIG_BOOTSTRAP); |
nkeynes@825 | 111 | if( bootstrap_file != NULL && bootstrap_file[0] != '\0' ) { |
nkeynes@736 | 112 | /* Load in a bootstrap before the binary, to initialize everything |
nkeynes@736 | 113 | * correctly |
nkeynes@736 | 114 | */ |
nkeynes@543 | 115 | if( mem_load_block( bootstrap_file, BOOTSTRAP_LOAD_ADDR, BOOTSTRAP_SIZE ) == 0 ) { |
nkeynes@736 | 116 | dreamcast_program_loaded( filename, BOOTSTRAP_LOAD_ADDR+0x300 ); |
nkeynes@736 | 117 | return; |
nkeynes@736 | 118 | } |
nkeynes@88 | 119 | } |
nkeynes@543 | 120 | dreamcast_program_loaded( filename, pc ); |
nkeynes@110 | 121 | } |
nkeynes@110 | 122 | |
nkeynes@110 | 123 | |
nkeynes@427 | 124 | gboolean file_load_binary( const gchar *filename ) |
nkeynes@110 | 125 | { |
nkeynes@110 | 126 | /* Load the binary itself */ |
nkeynes@427 | 127 | if( mem_load_block( filename, BINARY_LOAD_ADDR, -1 ) == 0 ) { |
nkeynes@736 | 128 | file_load_postload( filename, BINARY_LOAD_ADDR ); |
nkeynes@736 | 129 | return TRUE; |
nkeynes@427 | 130 | } else { |
nkeynes@736 | 131 | return FALSE; |
nkeynes@427 | 132 | } |
nkeynes@19 | 133 | } |
nkeynes@105 | 134 | |
nkeynes@543 | 135 | gboolean file_load_elf_fd( const gchar *filename, int fd ) |
nkeynes@105 | 136 | { |
nkeynes@105 | 137 | Elf32_Ehdr head; |
nkeynes@105 | 138 | Elf32_Phdr phdr; |
nkeynes@105 | 139 | int i; |
nkeynes@105 | 140 | |
nkeynes@105 | 141 | if( read( fd, &head, sizeof(head) ) != sizeof(head) ) |
nkeynes@736 | 142 | return FALSE; |
nkeynes@105 | 143 | if( head.e_ident[EI_CLASS] != ELFCLASS32 || |
nkeynes@736 | 144 | head.e_ident[EI_DATA] != ELFDATA2LSB || |
nkeynes@736 | 145 | head.e_ident[EI_VERSION] != 1 || |
nkeynes@736 | 146 | head.e_type != ET_EXEC || |
nkeynes@736 | 147 | head.e_machine != EM_SH || |
nkeynes@736 | 148 | head.e_version != 1 ) { |
nkeynes@736 | 149 | ERROR( "File is not an SH4 ELF executable file" ); |
nkeynes@736 | 150 | return FALSE; |
nkeynes@105 | 151 | } |
nkeynes@105 | 152 | |
nkeynes@105 | 153 | /* Program headers */ |
nkeynes@105 | 154 | for( i=0; i<head.e_phnum; i++ ) { |
nkeynes@736 | 155 | lseek( fd, head.e_phoff + i*head.e_phentsize, SEEK_SET ); |
nkeynes@736 | 156 | read( fd, &phdr, sizeof(phdr) ); |
nkeynes@736 | 157 | if( phdr.p_type == PT_LOAD ) { |
nkeynes@736 | 158 | lseek( fd, phdr.p_offset, SEEK_SET ); |
nkeynes@736 | 159 | sh4ptr_t target = mem_get_region( phdr.p_vaddr ); |
nkeynes@736 | 160 | read( fd, target, phdr.p_filesz ); |
nkeynes@736 | 161 | if( phdr.p_memsz > phdr.p_filesz ) { |
nkeynes@736 | 162 | memset( target + phdr.p_filesz, 0, phdr.p_memsz - phdr.p_filesz ); |
nkeynes@736 | 163 | } |
nkeynes@736 | 164 | INFO( "Loaded %d bytes to %08X", phdr.p_filesz, phdr.p_vaddr ); |
nkeynes@736 | 165 | } |
nkeynes@105 | 166 | } |
nkeynes@736 | 167 | |
nkeynes@543 | 168 | file_load_postload( filename, head.e_entry ); |
nkeynes@446 | 169 | return TRUE; |
nkeynes@105 | 170 | } |
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