common/cmd_autoscript.c

   1 /*
   2  * (C) Copyright 2001
   3  * Kyle Harris, kharris@nexus-tech.net
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 /*
  25  * autoscript allows a remote host to download a command file and,
  26  * optionally, binary data for automatically updating the target. For
  27  * example, you create a new kernel image and want the user to be
  28  * able to simply download the image and the machine does the rest.
  29  * The kernel image is postprocessed with mkimage, which creates an
  30  * image with a script file prepended. If enabled, autoscript will
  31  * verify the script and contents of the download and execute the
  32  * script portion. This would be responsible for erasing flash,
  33  * copying the new image, and rebooting the machine.
  34  */
  35
  36 /* #define DEBUG */
  37
  38 #include <common.h>
  39 #include <command.h>
  40 #include <image.h>
  41 #include <malloc.h>
  42 #include <asm/byteorder.h>
  43 #if defined(CONFIG_8xx)
  44 #include <mpc8xx.h>
  45 #endif
  46 #ifdef CFG_HUSH_PARSER
  47 #include <hush.h>
  48 #endif
  49
  50 #if defined(CONFIG_AUTOSCRIPT) || defined(CONFIG_CMD_AUTOSCRIPT)
  51
  52 int
  53 autoscript (ulong addr, const char *fit_uname)
  54 {
  55         ulong           len;
  56         image_header_t  *hdr;
  57         ulong           *data;
  58         char            *cmd;
  59         int             rcode = 0;
  60         int             verify;
  61 #if defined(CONFIG_FIT)
  62         const void*     fit_hdr;
  63         int             noffset;
  64         const void      *fit_data;
  65         size_t          fit_len;
  66 #endif
  67
  68         verify = getenv_verify ();
  69
  70         switch (genimg_get_format ((void *)addr)) {
  71         case IMAGE_FORMAT_LEGACY:
  72                 hdr = (image_header_t *)addr;
  73
  74                 if (!image_check_magic (hdr)) {
  75                         puts ("Bad magic number\n");
  76                         return 1;
  77                 }
  78
  79                 if (!image_check_hcrc (hdr)) {
  80                         puts ("Bad header crc\n");
  81                         return 1;
  82                 }
  83
  84                 if (verify) {
  85                         if (!image_check_dcrc (hdr)) {
  86                                 puts ("Bad data crc\n");
  87                                 return 1;
  88                         }
  89                 }
  90
  91                 if (!image_check_type (hdr, IH_TYPE_SCRIPT)) {
  92                         puts ("Bad image type\n");
  93                         return 1;
  94                 }
  95
  96                 /* get length of script */
  97                 data = (ulong *)image_get_data (hdr);
  98
  99                 if ((len = uimage_to_cpu (*data)) == 0) {
 100                         puts ("Empty Script\n");
 101                         return 1;
 102                 }
 103
 104                 /*
 105                  * scripts are just multi-image files with one component, seek
 106                  * past the zero-terminated sequence of image lengths to get
 107                  * to the actual image data
 108                  */
 109                 while (*data++);
 110                 break;
 111 #if defined(CONFIG_FIT)
 112         case IMAGE_FORMAT_FIT:
 113                 if (fit_uname == NULL) {
 114                         puts ("No FIT subimage unit name\n");
 115                         return 1;
 116                 }
 117
 118                 fit_hdr = (const void *)addr;
 119                 if (!fit_check_format (fit_hdr)) {
 120                         puts ("Bad FIT image format\n");
 121                         return 1;
 122                 }
 123
 124                 /* get script component image node offset */
 125                 noffset = fit_image_get_node (fit_hdr, fit_uname);
 126                 if (noffset < 0) {
 127                         printf ("Can't find '%s' FIT subimage\n", fit_uname);
 128                         return 1;
 129                 }
 130
 131                 if (!fit_image_check_type (fit_hdr, noffset, IH_TYPE_SCRIPT)) {
 132                         puts ("Not a image image\n");
 133                         return 1;
 134                 }
 135
 136                 /* verify integrity */
 137                 if (verify) {
 138                         if (!fit_image_check_hashes (fit_hdr, noffset)) {
 139                                 puts ("Bad Data Hash\n");
 140                                 return 1;
 141                         }
 142                 }
 143
 144                 /* get script subimage data address and length */
 145                 if (fit_image_get_data (fit_hdr, noffset, &fit_data, &fit_len)) {
 146                         puts ("Could not find script subimage data\n");
 147                         return 1;
 148                 }
 149
 150                 data = (ulong *)fit_data;
 151                 len = (ulong)fit_len;
 152                 break;
 153 #endif
 154         default:
 155                 puts ("Wrong image format for autoscript\n");
 156                 return 1;
 157         }
 158
 159         debug ("** Script length: %ld\n", len);
 160
 161         if ((cmd = malloc (len + 1)) == NULL) {
 162                 return 1;
 163         }
 164
 165         /* make sure cmd is null terminated */
 166         memmove (cmd, (char *)data, len);
 167         *(cmd + len) = 0;
 168
 169 #ifdef CFG_HUSH_PARSER /*?? */
 170         rcode = parse_string_outer (cmd, FLAG_PARSE_SEMICOLON);
 171 #else
 172         {
 173                 char *line = cmd;
 174                 char *next = cmd;
 175
 176                 /*
 177                  * break into individual lines,
 178                  * and execute each line;
 179                  * terminate on error.
 180                  */
 181                 while (*next) {
 182                         if (*next == '\n') {
 183                                 *next = '\0';
 184                                 /* run only non-empty commands */
 185                                 if ((next - line) > 1) {
 186                                         debug ("** exec: \"%s\"\n",
 187                                                 line);
 188                                         if (run_command (line, 0) < 0) {
 189                                                 rcode = 1;
 190                                                 break;
 191                                         }
 192                                 }
 193                                 line = next + 1;
 194                         }
 195                         ++next;
 196                 }
 197         }
 198 #endif
 199         free (cmd);
 200         return rcode;
 201 }
 202
 203 #endif
 204
 205 /**************************************************/
 206 #if defined(CONFIG_CMD_AUTOSCRIPT)
 207 int
 208 do_autoscript (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 209 {
 210         ulong addr;
 211         int rcode;
 212         const char *fit_uname = NULL;
 213
 214         /* Find script image */
 215         if (argc < 2) {
 216                 addr = CFG_LOAD_ADDR;
 217                 debug ("*  autoscr: default load address = 0x%08lx\n", addr);
 218 #if defined(CONFIG_FIT)
 219         } else if (fit_parse_subimage (argv[1], load_addr, &addr, &fit_uname)) {
 220                 debug ("*  autoscr: subimage '%s' from FIT image at 0x%08lx\n",
 221                                 fit_uname, addr);
 222 #endif
 223         } else {
 224                 addr = simple_strtoul(argv[1], NULL, 16);
 225                 debug ("*  autoscr: cmdline image address = 0x%08lx\n", addr);
 226         }
 227
 228         printf ("## Executing script at %08lx\n", addr);
 229         rcode = autoscript (addr, fit_uname);
 230         return rcode;
 231 }
 232
 233 U_BOOT_CMD(
 234         autoscr, 2, 0,  do_autoscript,
 235         "autoscr - run script from memory\n",
 236         "[addr] - run script starting at addr"
 237         " - A valid autoscr header must be present\n"
 238 #if defined(CONFIG_FIT)
 239         "For FIT format uImage addr must include subimage\n"
 240         "unit name in the form of addr:<subimg_uname>\n"
 241 #endif
 242 );
 243 #endif