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lxdream.org :: lxdream/src/loader.c
lxdream 0.9.1
released Jun 29
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filename src/loader.c
changeset 537:d924be49e192
prev502:c4ecae2b1b5e
next543:361ec0a70cf2
author nkeynes
date Tue Nov 20 10:27:58 2007 +0000 (14 years ago)
permissions -rw-r--r--
last change Move gtk UI into gtkui subdir (prep for non-gtk builds), and protect with
an automake conditional
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     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 "sh4core.h"
    29 #include "bootstrap.h"
    30 #include "dreamcast.h"
    31 #include "config.h"
    32 #include "loader.h"
    33 #include "syscall.h"
    34 #include "gui.h"
    36 char bootstrap_magic[32] = "SEGA SEGAKATANA SEGA ENTERPRISES";
    37 char iso_magic[6] = "\001CD001";
    38 char *file_loader_extensions[][2] = { 
    39     { "sbi", "Self Boot Inducer" },
    40     { "bin", "SH4 Bin file" },
    41     { NULL, NULL } };
    43 #define BOOTSTRAP_LOAD_ADDR 0x8C008000
    44 #define BOOTSTRAP_SIZE 32768
    46 #define BINARY_LOAD_ADDR 0x8C010000
    48 #define CDI_V2 0x80000004
    49 #define CDI_V3 0x80000005
    51 gboolean file_load_elf_fd( int fd );
    54 gboolean file_load_magic( const gchar *filename )
    55 {
    56     char buf[32];
    57     struct stat st;
    58     gboolean result = TRUE;
    60     int fd = open( filename, O_RDONLY );
    61     if( fd == -1 ) {
    62         return FALSE;
    63     }
    65     fstat( fd, &st );
    67     /* begin magic */
    68     if( read( fd, buf, 32 ) != 32 ) {
    69         ERROR( "Unable to read from file '%s'", filename );
    70         close(fd);
    71         return FALSE;
    72     }
    73     if( memcmp( buf, bootstrap_magic, 32 ) == 0 ) {
    74         /* we have a DC bootstrap */
    75         if( st.st_size == BOOTSTRAP_SIZE ) {
    76             sh4ptr_t load = mem_get_region( BOOTSTRAP_LOAD_ADDR );
    77             lseek( fd, 0, SEEK_SET );
    78             read( fd, load, BOOTSTRAP_SIZE );
    79             bootstrap_dump( load, TRUE );
    80             sh4_set_pc( BOOTSTRAP_LOAD_ADDR + 0x300 );
    81             gui_update_state();
    82         } else {
    83             /* look for a valid ISO9660 header */
    84             lseek( fd, 32768, SEEK_SET );
    85             read( fd, buf, 8 );
    86             if( memcmp( buf, iso_magic, 6 ) == 0 ) {
    87                 /* Alright, got it */
    88                 INFO( "Loading ISO9660 filesystem from '%s'",
    89                       filename );
    90             }
    91         }
    92     } else if( memcmp( buf, "PK\x03\x04", 4 ) == 0 ) {
    93 	/* ZIP file, aka SBI file */
    94 	WARN( "SBI files not supported yet" );
    95 	result = FALSE;
    96     } else if( memcmp( buf, DREAMCAST_SAVE_MAGIC, 16 ) == 0 ) {
    97 	/* Save state */
    98 	result = (dreamcast_load_state( filename )==0);
    99     } else if( buf[0] == 0x7F && buf[1] == 'E' && 
   100 	       buf[2] == 'L' && buf[3] == 'F' ) {
   101 	/* ELF binary */
   102 	lseek( fd, 0, SEEK_SET );
   103 	result = file_load_elf_fd( fd );
   104     } else {
   105 	result = FALSE;
   106     }
   107     close(fd);
   108     return result;
   109 }
   111 void file_load_postload( int pc )
   112 {
   113     const gchar *bootstrap_file = lxdream_get_config_value(CONFIG_BOOTSTRAP);
   114     if( bootstrap_file != NULL ) {
   115 	/* Load in a bootstrap before the binary, to initialize everything
   116 	 * correctly
   117 	 */
   118 	if( mem_load_block( bootstrap_file, BOOTSTRAP_LOAD_ADDR, BOOTSTRAP_SIZE ) != 0 ) {
   119 	    /* Try it without the bootstrap */
   120 	    sh4_set_pc( pc );
   121 	} else {
   122 	    sh4_set_pc( BOOTSTRAP_LOAD_ADDR + 0x300 );
   123 	}
   124     } else {
   125 	sh4_set_pc( pc );
   126     }
   127     bios_install();
   128     dcload_install();
   129     gui_update_state();
   130 }    
   133 gboolean file_load_binary( const gchar *filename )
   134 {
   135     /* Load the binary itself */
   136     if(  mem_load_block( filename, BINARY_LOAD_ADDR, -1 ) == 0 ) {
   137 	file_load_postload( BINARY_LOAD_ADDR );
   138 	return TRUE;
   139     } else {
   140 	return FALSE;
   141     }
   142 }
   144 gboolean file_load_elf_fd( int fd ) 
   145 {
   146     Elf32_Ehdr head;
   147     Elf32_Phdr phdr;
   148     int i;
   150     if( read( fd, &head, sizeof(head) ) != sizeof(head) )
   151 	return FALSE;
   152     if( head.e_ident[EI_CLASS] != ELFCLASS32 ||
   153 	head.e_ident[EI_DATA] != ELFDATA2LSB ||
   154 	head.e_ident[EI_VERSION] != 1 ||
   155 	head.e_type != ET_EXEC ||
   156 	head.e_machine != EM_SH ||
   157 	head.e_version != 1 ) {
   158 	ERROR( "File is not an SH4 ELF executable file" );
   159 	return FALSE;
   160     }
   162     /* Program headers */
   163     for( i=0; i<head.e_phnum; i++ ) {
   164 	lseek( fd, head.e_phoff + i*head.e_phentsize, SEEK_SET );
   165 	read( fd, &phdr, sizeof(phdr) );
   166 	if( phdr.p_type == PT_LOAD ) {
   167 	    lseek( fd, phdr.p_offset, SEEK_SET );
   168 	    sh4ptr_t target = mem_get_region( phdr.p_vaddr );
   169 	    read( fd, target, phdr.p_filesz );
   170 	    if( phdr.p_memsz > phdr.p_filesz ) {
   171 		memset( target + phdr.p_filesz, 0, phdr.p_memsz - phdr.p_filesz );
   172 	    }
   173 	    INFO( "Loaded %d bytes to %08X", phdr.p_filesz, phdr.p_vaddr );
   174 	}
   175     }
   177     file_load_postload( head.e_entry );
   178     return TRUE;
   179 }
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