kthacker | 6de6775 | 2006-04-17 15:02:26 +0000 | [diff] [blame^] | 1 | /** |
| 2 | * \file |
| 3 | * File loader implementation. |
| 4 | * \author Adam Dunkels <adam@dunkels.com> |
| 5 | * |
| 6 | * This file implements dynamically loadable files for Contiki using |
| 7 | * the cc65 module loading system. The actual file operations are |
| 8 | * implemented in other files. |
| 9 | */ |
| 10 | |
| 11 | /* |
| 12 | * Copyright (c) 2003, Adam Dunkels. |
| 13 | * All rights reserved. |
| 14 | * |
| 15 | * Redistribution and use in source and binary forms, with or without |
| 16 | * modification, are permitted provided that the following conditions |
| 17 | * are met: |
| 18 | * 1. Redistributions of source code must retain the above copyright |
| 19 | * notice, this list of conditions and the following disclaimer. |
| 20 | * 2. Redistributions in binary form must reproduce the above |
| 21 | * copyright notice, this list of conditions and the following |
| 22 | * disclaimer in the documentation and/or other materials provided |
| 23 | * with the distribution. |
| 24 | * 3. The name of the author may not be used to endorse or promote |
| 25 | * products derived from this software without specific prior |
| 26 | * written permission. |
| 27 | * |
| 28 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS |
| 29 | * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
| 30 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 31 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY |
| 32 | * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 33 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE |
| 34 | * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 35 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
| 36 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| 37 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| 38 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 39 | * |
| 40 | * This file is part of the Contiki desktop OS |
| 41 | * |
| 42 | * $Id: loader-arch.c,v 1.1 2006/04/17 15:02:38 kthacker Exp $ |
| 43 | * |
| 44 | */ |
| 45 | |
| 46 | #include <stdlib.h> |
| 47 | #include "modload.h" |
| 48 | |
| 49 | #ifndef NULL |
| 50 | #define NULL (void *)0 |
| 51 | #endif /* NULL */ |
| 52 | |
| 53 | #include "cfs.h" |
| 54 | |
| 55 | #include "loader.h" |
| 56 | |
| 57 | #include "loader-arch.h" |
| 58 | |
| 59 | static int __fastcall__ |
| 60 | do_read(int f, char *buf, unsigned int len) |
| 61 | { |
| 62 | return cfs_read(f, buf, len); |
| 63 | } |
| 64 | |
| 65 | static struct mod_ctrl ctrl = { |
| 66 | (void *)do_read /* Read from disk */ |
| 67 | }; |
| 68 | |
| 69 | |
| 70 | struct loader_arch_hdr { |
| 71 | char arch[8]; |
| 72 | char version[8]; |
| 73 | |
| 74 | char initfunc[1]; |
| 75 | }; |
| 76 | |
| 77 | /*-----------------------------------------------------------------------------------*/ |
| 78 | /** |
| 79 | * \internal |
| 80 | * Load a program from disk and execute it. |
| 81 | * |
| 82 | * Code originally written by Ullrich von Bassewitz. |
| 83 | */ |
| 84 | /*-----------------------------------------------------------------------------------*/ |
| 85 | static unsigned char |
| 86 | load(const char *name) |
| 87 | { |
| 88 | unsigned char res; |
| 89 | |
| 90 | /* Now open the file */ |
| 91 | ctrl.callerdata = cfs_open(name, 0); |
| 92 | if(ctrl.callerdata < 0) { |
| 93 | /* Could not open the file, display an error and return */ |
| 94 | /* ### */ |
| 95 | return LOADER_ERR_OPEN; |
| 96 | } |
| 97 | |
| 98 | /* Load the module */ |
| 99 | res = mod_load(&ctrl); |
| 100 | |
| 101 | /* Close the input file */ |
| 102 | cfs_close(ctrl.callerdata); |
| 103 | |
| 104 | /* Check the return code */ |
| 105 | if(res != MLOAD_OK) { |
| 106 | /* Wrong module, out of memory or whatever. Print an error |
| 107 | * message and return. |
| 108 | */ |
| 109 | /* ### */ |
| 110 | return res; |
| 111 | } |
| 112 | |
| 113 | /* We've successfully loaded the module. */ |
| 114 | |
| 115 | return LOADER_OK; |
| 116 | } |
| 117 | /*-----------------------------------------------------------------------------------*/ |
| 118 | /** |
| 119 | * Load and start a program. |
| 120 | * |
| 121 | * \param name The name of the program file. |
| 122 | * \param arg A pointer that will be passed to the new process. |
| 123 | */ |
| 124 | /*-----------------------------------------------------------------------------------*/ |
| 125 | unsigned char |
| 126 | loader_arch_load(const char *name, char *arg) |
| 127 | { |
| 128 | unsigned char r; |
| 129 | struct loader_arch_hdr *hdr; |
| 130 | |
| 131 | r = load(name); |
| 132 | if(r != MLOAD_OK) { |
| 133 | return r; |
| 134 | } |
| 135 | hdr = (struct loader_arch_hdr *)ctrl.module; |
| 136 | |
| 137 | /* Check the program header and see that version and architecture |
| 138 | matches. */ |
| 139 | |
| 140 | /* Call the init function. */ |
| 141 | ((void (*)(char *))hdr->initfunc)(arg); |
| 142 | |
| 143 | return LOADER_OK; |
| 144 | } |
| 145 | /*-----------------------------------------------------------------------------------*/ |
| 146 | /** |
| 147 | * Load a DSC file into memory. |
| 148 | * |
| 149 | * The memory must be deallocated with the loader_arch_free() function |
| 150 | * after is has been used. |
| 151 | * |
| 152 | * \param name The name of the DSC file. |
| 153 | * |
| 154 | * \return A pointer to the struct dsc or NULL if the DSC file could |
| 155 | * not be loaded. |
| 156 | */ |
| 157 | /*-----------------------------------------------------------------------------------*/ |
| 158 | struct dsc * |
| 159 | loader_arch_load_dsc(const char *name) |
| 160 | { |
| 161 | unsigned char r; |
| 162 | |
| 163 | r = load(name); |
| 164 | if(r == MLOAD_OK) { |
| 165 | return (struct dsc *)ctrl.module; |
| 166 | } |
| 167 | return NULL; |
| 168 | } |
| 169 | /*-----------------------------------------------------------------------------------*/ |
| 170 | /** |
| 171 | * Deallocate memory previously allocated by the loader. |
| 172 | * |
| 173 | * The loader allocates memory when it loads programs or DSC |
| 174 | * files. All such memory must be deallocated with this function. Memory for programs is automatically deallocated when calling the LOADER_UNLOAD() function, but memory for DSCs must be explicitly deallcated with this function. |
| 175 | * |
| 176 | * \param addr A pointer to memory allocated by the loader. |
| 177 | */ |
| 178 | /*-----------------------------------------------------------------------------------*/ |
| 179 | void |
| 180 | loader_arch_free(void *addr) |
| 181 | { |
| 182 | mod_free(addr); |
| 183 | } |
| 184 | /*-----------------------------------------------------------------------------------*/ |
| 185 | |