lxdream 0.9.1| filename | src/loader.c |
| changeset | 543:361ec0a70cf2 |
| prev | 537:d924be49e192 |
| next | 561:533f6b478071 |
| author | nkeynes |
| date | Thu Nov 22 11:10:15 2007 +0000 (15 years ago) |
| permissions | -rw-r--r-- |
| last change | Re-add "Load Binary" menu item (misplaced in GUI rewrite) Prevent running with no code loaded |
| view | annotate | diff | log | raw |
1 /**
2 * $Id: loader.c,v 1.22 2007-11-08 11:54:16 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 <unistd.h>
21 #include <stdio.h>
22 #include <fcntl.h>
23 #include <sys/stat.h>
24 #include <errno.h>
25 #include <stdint.h>
26 #include <elf.h>
27 #include "mem.h"
28 #include "bootstrap.h"
29 #include "dreamcast.h"
30 #include "config.h"
31 #include "loader.h"
33 char bootstrap_magic[32] = "SEGA SEGAKATANA SEGA ENTERPRISES";
34 char iso_magic[6] = "\001CD001";
35 char *file_loader_extensions[][2] = {
36 { "sbi", "Self Boot Inducer" },
37 { "bin", "SH4 Bin file" },
38 { NULL, NULL } };
40 #define BOOTSTRAP_LOAD_ADDR 0x8C008000
41 #define BOOTSTRAP_SIZE 32768
43 #define BINARY_LOAD_ADDR 0x8C010000
45 #define CDI_V2 0x80000004
46 #define CDI_V3 0x80000005
48 gboolean file_load_elf_fd( const gchar *filename, int fd );
51 gboolean file_load_magic( const gchar *filename )
52 {
53 char buf[32];
54 struct stat st;
55 gboolean result = TRUE;
57 int fd = open( filename, O_RDONLY );
58 if( fd == -1 ) {
59 return FALSE;
60 }
62 fstat( fd, &st );
64 /* begin magic */
65 if( read( fd, buf, 32 ) != 32 ) {
66 ERROR( "Unable to read from file '%s'", filename );
67 close(fd);
68 return FALSE;
69 }
70 if( memcmp( buf, bootstrap_magic, 32 ) == 0 ) {
71 /* we have a DC bootstrap */
72 if( st.st_size == BOOTSTRAP_SIZE ) {
73 sh4ptr_t load = mem_get_region( BOOTSTRAP_LOAD_ADDR );
74 lseek( fd, 0, SEEK_SET );
75 read( fd, load, BOOTSTRAP_SIZE );
76 bootstrap_dump( load, TRUE );
77 dreamcast_program_loaded( filename, BOOTSTRAP_LOAD_ADDR + 0x300 );
78 } else {
79 /* look for a valid ISO9660 header */
80 lseek( fd, 32768, SEEK_SET );
81 read( fd, buf, 8 );
82 if( memcmp( buf, iso_magic, 6 ) == 0 ) {
83 /* Alright, got it */
84 INFO( "Loading ISO9660 filesystem from '%s'",
85 filename );
86 }
87 }
88 } else if( memcmp( buf, "PK\x03\x04", 4 ) == 0 ) {
89 /* ZIP file, aka SBI file */
90 WARN( "SBI files not supported yet" );
91 result = FALSE;
92 } else if( memcmp( buf, DREAMCAST_SAVE_MAGIC, 16 ) == 0 ) {
93 /* Save state */
94 result = (dreamcast_load_state( filename )==0);
95 } else if( buf[0] == 0x7F && buf[1] == 'E' &&
96 buf[2] == 'L' && buf[3] == 'F' ) {
97 /* ELF binary */
98 lseek( fd, 0, SEEK_SET );
99 result = file_load_elf_fd( filename, fd );
100 } else {
101 result = FALSE;
102 }
103 close(fd);
104 return result;
105 }
107 void file_load_postload( const gchar *filename, int pc )
108 {
109 const gchar *bootstrap_file = lxdream_get_config_value(CONFIG_BOOTSTRAP);
110 if( bootstrap_file != NULL ) {
111 /* Load in a bootstrap before the binary, to initialize everything
112 * correctly
113 */
114 if( mem_load_block( bootstrap_file, BOOTSTRAP_LOAD_ADDR, BOOTSTRAP_SIZE ) == 0 ) {
115 dreamcast_program_loaded( filename, BOOTSTRAP_LOAD_ADDR+0x300 );
116 return;
117 }
118 }
119 dreamcast_program_loaded( filename, pc );
120 }
123 gboolean file_load_binary( const gchar *filename )
124 {
125 /* Load the binary itself */
126 if( mem_load_block( filename, BINARY_LOAD_ADDR, -1 ) == 0 ) {
127 file_load_postload( filename, BINARY_LOAD_ADDR );
128 return TRUE;
129 } else {
130 return FALSE;
131 }
132 }
134 gboolean file_load_elf_fd( const gchar *filename, int fd )
135 {
136 Elf32_Ehdr head;
137 Elf32_Phdr phdr;
138 int i;
140 if( read( fd, &head, sizeof(head) ) != sizeof(head) )
141 return FALSE;
142 if( head.e_ident[EI_CLASS] != ELFCLASS32 ||
143 head.e_ident[EI_DATA] != ELFDATA2LSB ||
144 head.e_ident[EI_VERSION] != 1 ||
145 head.e_type != ET_EXEC ||
146 head.e_machine != EM_SH ||
147 head.e_version != 1 ) {
148 ERROR( "File is not an SH4 ELF executable file" );
149 return FALSE;
150 }
152 /* Program headers */
153 for( i=0; i<head.e_phnum; i++ ) {
154 lseek( fd, head.e_phoff + i*head.e_phentsize, SEEK_SET );
155 read( fd, &phdr, sizeof(phdr) );
156 if( phdr.p_type == PT_LOAD ) {
157 lseek( fd, phdr.p_offset, SEEK_SET );
158 sh4ptr_t target = mem_get_region( phdr.p_vaddr );
159 read( fd, target, phdr.p_filesz );
160 if( phdr.p_memsz > phdr.p_filesz ) {
161 memset( target + phdr.p_filesz, 0, phdr.p_memsz - phdr.p_filesz );
162 }
163 INFO( "Loaded %d bytes to %08X", phdr.p_filesz, phdr.p_vaddr );
164 }
165 }
167 file_load_postload( filename, head.e_entry );
168 return TRUE;
169 }
.