filename | src/loader.c |
changeset | 454:f6586b97813a |
prev | 450:207461e79f21 |
next | 481:3b2d6c5a19ad |
author | nkeynes |
date | Sun Oct 28 07:23:46 2007 +0000 (16 years ago) |
permissions | -rw-r--r-- |
last change | Fix CDI with multiple tracks/session Fix file being closed too early |
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1 /**
2 * $Id: loader.c,v 1.20 2007-10-21 05:20:35 nkeynes Exp $
3 *
4 * File loading routines, mostly for loading demos without going through the
5 * whole procedure of making a CD image for them.
6 *
7 * Copyright (c) 2005 Nathan Keynes.
8 *
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.
13 *
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.
18 */
20 #include <stdio.h>
21 #include <fcntl.h>
22 #include <sys/stat.h>
23 #include <errno.h>
24 #include <stdint.h>
25 #include <elf.h>
26 #include "mem.h"
27 #include "sh4core.h"
28 #include "bootstrap.h"
29 #include "dreamcast.h"
30 #include "config.h"
31 #include "loader.h"
32 #include "syscall.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" },
39 { NULL, NULL } };
41 #define BOOTSTRAP_LOAD_ADDR 0x8C008000
42 #define BOOTSTRAP_SIZE 32768
44 #define BINARY_LOAD_ADDR 0x8C010000
46 #define CDI_V2 0x80000004
47 #define CDI_V3 0x80000005
49 gboolean file_load_elf_fd( int fd );
52 gboolean file_load_magic( const gchar *filename )
53 {
54 char buf[32];
55 struct stat st;
56 gboolean result = TRUE;
58 int fd = open( filename, O_RDONLY );
59 if( fd == -1 ) {
60 return FALSE;
61 }
63 fstat( fd, &st );
65 /* begin magic */
66 if( read( fd, buf, 32 ) != 32 ) {
67 ERROR( "Unable to read from file '%s'", filename );
68 close(fd);
69 return FALSE;
70 }
71 if( memcmp( buf, bootstrap_magic, 32 ) == 0 ) {
72 /* we have a DC bootstrap */
73 if( st.st_size == BOOTSTRAP_SIZE ) {
74 unsigned char *load = (unsigned char *)mem_get_region( BOOTSTRAP_LOAD_ADDR );
75 lseek( fd, 0, SEEK_SET );
76 read( fd, load, BOOTSTRAP_SIZE );
77 bootstrap_dump( load, TRUE );
78 sh4_set_pc( BOOTSTRAP_LOAD_ADDR + 0x300 );
79 gtk_gui_update();
80 } else {
81 /* look for a valid ISO9660 header */
82 lseek( fd, 32768, SEEK_SET );
83 read( fd, buf, 8 );
84 if( memcmp( buf, iso_magic, 6 ) == 0 ) {
85 /* Alright, got it */
86 INFO( "Loading ISO9660 filesystem from '%s'",
87 filename );
88 }
89 }
90 } else if( memcmp( buf, "PK\x03\x04", 4 ) == 0 ) {
91 /* ZIP file, aka SBI file */
92 WARN( "SBI files not supported yet" );
93 result = FALSE;
94 } else if( memcmp( buf, DREAMCAST_SAVE_MAGIC, 16 ) == 0 ) {
95 /* Save state */
96 result = (dreamcast_load_state( filename )==0);
97 } else if( buf[0] == 0x7F && buf[1] == 'E' &&
98 buf[2] == 'L' && buf[3] == 'F' ) {
99 /* ELF binary */
100 lseek( fd, 0, SEEK_SET );
101 result = file_load_elf_fd( fd );
102 } else {
103 result = FALSE;
104 }
105 close(fd);
106 return result;
107 }
109 void file_load_postload( int pc )
110 {
111 const gchar *bootstrap_file = lxdream_get_config_value(CONFIG_BOOTSTRAP);
112 if( bootstrap_file != NULL ) {
113 /* Load in a bootstrap before the binary, to initialize everything
114 * correctly
115 */
116 if( mem_load_block( bootstrap_file, BOOTSTRAP_LOAD_ADDR, BOOTSTRAP_SIZE ) != 0 ) {
117 /* Try it without the bootstrap */
118 sh4_set_pc( pc );
119 } else {
120 sh4_set_pc( BOOTSTRAP_LOAD_ADDR + 0x300 );
121 }
122 } else {
123 sh4_set_pc( pc );
124 }
125 bios_install();
126 dcload_install();
127 gtk_gui_update();
128 }
131 gboolean file_load_binary( const gchar *filename )
132 {
133 /* Load the binary itself */
134 if( mem_load_block( filename, BINARY_LOAD_ADDR, -1 ) == 0 ) {
135 file_load_postload( BINARY_LOAD_ADDR );
136 return TRUE;
137 } else {
138 return FALSE;
139 }
140 }
142 gboolean file_load_elf_fd( int fd )
143 {
144 Elf32_Ehdr head;
145 Elf32_Phdr phdr;
146 int i;
148 if( read( fd, &head, sizeof(head) ) != sizeof(head) )
149 return FALSE;
150 if( head.e_ident[EI_CLASS] != ELFCLASS32 ||
151 head.e_ident[EI_DATA] != ELFDATA2LSB ||
152 head.e_ident[EI_VERSION] != 1 ||
153 head.e_type != ET_EXEC ||
154 head.e_machine != EM_SH ||
155 head.e_version != 1 ) {
156 ERROR( "File is not an SH4 ELF executable file" );
157 return FALSE;
158 }
160 /* Program headers */
161 for( i=0; i<head.e_phnum; i++ ) {
162 lseek( fd, head.e_phoff + i*head.e_phentsize, SEEK_SET );
163 read( fd, &phdr, sizeof(phdr) );
164 if( phdr.p_type == PT_LOAD ) {
165 lseek( fd, phdr.p_offset, SEEK_SET );
166 char *target = mem_get_region( phdr.p_vaddr );
167 read( fd, target, phdr.p_filesz );
168 if( phdr.p_memsz > phdr.p_filesz ) {
169 memset( target + phdr.p_filesz, 0, phdr.p_memsz - phdr.p_filesz );
170 }
171 INFO( "Loaded %d bytes to %08X", phdr.p_filesz, phdr.p_vaddr );
172 }
173 }
175 file_load_postload( head.e_entry );
176 return TRUE;
177 }
.