common/cmd_elf.c

   1 /*
   2  * Copyright (c) 2001 William L. Pitts
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms are freely
   6  * permitted provided that the above copyright notice and this
   7  * paragraph and the following disclaimer are duplicated in all
   8  * such forms.
   9  *
  10  * This software is provided "AS IS" and without any express or
  11  * implied warranties, including, without limitation, the implied
  12  * warranties of merchantability and fitness for a particular
  13  * purpose.
  14  */
  15
  16 #include <common.h>
  17 #include <command.h>
  18 #include <linux/ctype.h>
  19 #include <net.h>
  20 #include <elf.h>
  21
  22 #if defined(CONFIG_WALNUT) || defined(CFG_VXWORKS_MAC_PTR)
  23 DECLARE_GLOBAL_DATA_PTR;
  24 #endif
  25
  26 #if (CONFIG_COMMANDS & CFG_CMD_ELF)
  27
  28 #ifndef MAX
  29 #define MAX(a,b) ((a) > (b) ? (a) : (b))
  30 #endif
  31
  32 int valid_elf_image (unsigned long addr);
  33 unsigned long load_elf_image (unsigned long addr);
  34
  35 /* ======================================================================
  36  * Interpreter command to boot an arbitrary ELF image from memory.
  37  * ====================================================================== */
  38 int do_bootelf (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
  39 {
  40         unsigned long addr;             /* Address of the ELF image     */
  41         unsigned long rc;               /* Return value from user code  */
  42
  43         /* -------------------------------------------------- */
  44         int rcode = 0;
  45
  46         if (argc < 2)
  47                 addr = load_addr;
  48         else
  49                 addr = simple_strtoul (argv[1], NULL, 16);
  50
  51         if (!valid_elf_image (addr))
  52                 return 1;
  53
  54         addr = load_elf_image (addr);
  55
  56         printf ("## Starting application at 0x%08lx ...\n", addr);
  57
  58         /*
  59          * QNX images require the data cache is disabled.
  60          * Data cache is already flushed, so just turn it off.
  61          */
  62         if (dcache_status ())
  63                 dcache_disable ();
  64
  65         /*
  66          * pass address parameter as argv[0] (aka command name),
  67          * and all remaining args
  68          */
  69         rc = ((ulong (*)(int, char *[])) addr) (--argc, &argv[1]);
  70         if (rc != 0)
  71                 rcode = 1;
  72
  73         printf ("## Application terminated, rc = 0x%lx\n", rc);
  74         return rcode;
  75 }
  76
  77 /* ======================================================================
  78  * Interpreter command to boot VxWorks from a memory image.  The image can
  79  * be either an ELF image or a raw binary.  Will attempt to setup the
  80  * bootline and other parameters correctly.
  81  * ====================================================================== */
  82 int do_bootvx ( cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
  83 {
  84         unsigned long addr;             /* Address of image            */
  85         unsigned long bootaddr;         /* Address to put the bootline */
  86         char *bootline;                 /* Text of the bootline        */
  87         char *tmp;                      /* Temporary char pointer      */
  88
  89 #if defined(CONFIG_4xx) || defined(CONFIG_IOP480)
  90         char build_buf[80];             /* Buffer for building the bootline */
  91 #endif
  92         /* -------------------------------------------------- */
  93
  94         /*
  95          * Check the loadaddr variable.
  96          * If we don't know where the image is then we're done.
  97          */
  98
  99         if ((tmp = getenv ("loadaddr")) != NULL) {
 100                 addr = simple_strtoul (tmp, NULL, 16);
 101         } else {
 102                 puts ("No load address provided\n");
 103                 return 1;
 104         }
 105
 106 #if (CONFIG_COMMANDS & CFG_CMD_NET)
 107         /* Check to see if we need to tftp the image ourselves before starting */
 108
 109         if ((argc == 2) && (strcmp (argv[1], "tftp") == 0)) {
 110                 if (NetLoop (TFTP) <= 0)
 111                         return 1;
 112                 printf ("Automatic boot of VxWorks image at address 0x%08lx ... \n", addr);
 113         }
 114 #endif
 115
 116         /* This should equate
 117          * to NV_RAM_ADRS + NV_BOOT_OFFSET + NV_ENET_OFFSET
 118          * from the VxWorks BSP header files.
 119          * This will vary from board to board
 120          */
 121
 122 #if defined(CONFIG_WALNUT)
 123         tmp = (char *) CFG_NVRAM_BASE_ADDR + 0x500;
 124         memcpy ((char *) tmp, (char *) &gd->bd->bi_enetaddr[3], 3);
 125 #elif defined(CFG_VXWORKS_MAC_PTR)
 126         tmp = (char *) CFG_VXWORKS_MAC_PTR;
 127         memcpy ((char *) tmp, (char *) &gd->bd->bi_enetaddr[0], 6);
 128 #else
 129         puts ("## Ethernet MAC address not copied to NV RAM\n");
 130 #endif
 131
 132         /*
 133          * Use bootaddr to find the location in memory that VxWorks
 134          * will look for the bootline string. The default value for
 135          * PowerPC is LOCAL_MEM_LOCAL_ADRS + BOOT_LINE_OFFSET which
 136          * defaults to 0x4200
 137          */
 138
 139         if ((tmp = getenv ("bootaddr")) == NULL)
 140                 bootaddr = 0x4200;
 141         else
 142                 bootaddr = simple_strtoul (tmp, NULL, 16);
 143
 144         /*
 145          * Check to see if the bootline is defined in the 'bootargs'
 146          * parameter. If it is not defined, we may be able to
 147          * construct the info
 148          */
 149
 150         if ((bootline = getenv ("bootargs")) != NULL) {
 151                 memcpy ((void *) bootaddr, bootline, MAX(strlen(bootline), 255));
 152                 flush_cache (bootaddr, MAX(strlen(bootline), 255));
 153         } else {
 154 #if defined(CONFIG_4xx)
 155                 sprintf (build_buf, "ibmEmac(0,0)");
 156
 157                 if ((tmp = getenv ("hostname")) != NULL) {
 158                         sprintf (&build_buf[strlen (build_buf - 1)],
 159                                 "host:%s ", tmp);
 160                 } else {
 161                         sprintf (&build_buf[strlen (build_buf - 1)],
 162                                 ": ");
 163                 }
 164
 165                 if ((tmp = getenv ("ipaddr")) != NULL) {
 166                         sprintf (&build_buf[strlen (build_buf - 1)],
 167                                 "e=%s ", tmp);
 168                 }
 169                 memcpy ((void *)bootaddr, build_buf, MAX(strlen(build_buf), 255));
 170                 flush_cache (bootaddr, MAX(strlen(build_buf), 255));
 171 #elif defined(CONFIG_IOP480)
 172                 sprintf (build_buf, "dc(0,0)");
 173
 174                 if ((tmp = getenv ("hostname")) != NULL) {
 175                         sprintf (&build_buf[strlen (build_buf - 1)],
 176                                 "host:%s ", tmp);
 177                 } else {
 178                         sprintf (&build_buf[strlen (build_buf - 1)],
 179                                 ": ");
 180                 }
 181
 182                 if ((tmp = getenv ("ipaddr")) != NULL) {
 183                         sprintf (&build_buf[strlen (build_buf - 1)],
 184                                 "e=%s ", tmp);
 185                 }
 186                 memcpy ((void *) bootaddr, build_buf, MAX(strlen(build_buf), 255));
 187                 flush_cache (bootaddr, MAX(strlen(build_buf), 255));
 188 #else
 189
 190                 /*
 191                  * I'm not sure what the device should be for other
 192                  * PPC flavors, the hostname and ipaddr should be ok
 193                  * to just copy
 194                  */
 195
 196                 puts ("No bootargs defined\n");
 197                 return 1;
 198 #endif
 199         }
 200
 201         /*
 202          * If the data at the load address is an elf image, then
 203          * treat it like an elf image. Otherwise, assume that it is a
 204          * binary image
 205          */
 206
 207         if (valid_elf_image (addr)) {
 208                 addr = load_elf_image (addr);
 209         } else {
 210                 puts ("## Not an ELF image, assuming binary\n");
 211                 /* leave addr as load_addr */
 212         }
 213
 214         printf ("## Using bootline (@ 0x%lx): %s\n", bootaddr,
 215                         (char *) bootaddr);
 216         printf ("## Starting vxWorks at 0x%08lx ...\n", addr);
 217
 218         ((void (*)(void)) addr) ();
 219
 220         puts ("## vxWorks terminated\n");
 221         return 1;
 222 }
 223
 224 /* ======================================================================
 225  * Determine if a valid ELF image exists at the given memory location.
 226  * First looks at the ELF header magic field, the makes sure that it is
 227  * executable and makes sure that it is for a PowerPC.
 228  * ====================================================================== */
 229 int valid_elf_image (unsigned long addr)
 230 {
 231         Elf32_Ehdr *ehdr;               /* Elf header structure pointer */
 232
 233         /* -------------------------------------------------- */
 234
 235         ehdr = (Elf32_Ehdr *) addr;
 236
 237         if (!IS_ELF (*ehdr)) {
 238                 printf ("## No elf image at address 0x%08lx\n", addr);
 239                 return 0;
 240         }
 241
 242         if (ehdr->e_type != ET_EXEC) {
 243                 printf ("## Not a 32-bit elf image at address 0x%08lx\n",
 244                         addr);
 245                 return 0;
 246         }
 247
 248 #if 0
 249         if (ehdr->e_machine != EM_PPC) {
 250                 printf ("## Not a PowerPC elf image at address 0x%08lx\n",
 251                         addr);
 252                 return 0;
 253         }
 254 #endif
 255
 256         return 1;
 257 }
 258
 259
 260 /* ======================================================================
 261  * A very simple elf loader, assumes the image is valid, returns the
 262  * entry point address.
 263  * ====================================================================== */
 264 unsigned long load_elf_image (unsigned long addr)
 265 {
 266         Elf32_Ehdr *ehdr;               /* Elf header structure pointer     */
 267         Elf32_Shdr *shdr;               /* Section header structure pointer */
 268         unsigned char *strtab = 0;      /* String table pointer             */
 269         unsigned char *image;           /* Binary image pointer             */
 270         int i;                          /* Loop counter                     */
 271
 272         /* -------------------------------------------------- */
 273
 274         ehdr = (Elf32_Ehdr *) addr;
 275
 276         /* Find the section header string table for output info */
 277         shdr = (Elf32_Shdr *) (addr + ehdr->e_shoff +
 278                                (ehdr->e_shstrndx * sizeof (Elf32_Shdr)));
 279
 280         if (shdr->sh_type == SHT_STRTAB)
 281                 strtab = (unsigned char *) (addr + shdr->sh_offset);
 282
 283         /* Load each appropriate section */
 284         for (i = 0; i < ehdr->e_shnum; ++i) {
 285                 shdr = (Elf32_Shdr *) (addr + ehdr->e_shoff +
 286                                        (i * sizeof (Elf32_Shdr)));
 287
 288                 if (!(shdr->sh_flags & SHF_ALLOC)
 289                    || shdr->sh_addr == 0 || shdr->sh_size == 0) {
 290                         continue;
 291                 }
 292
 293                 if (strtab) {
 294                         printf ("%sing %s @ 0x%08lx (%ld bytes)\n",
 295                                 (shdr->sh_type == SHT_NOBITS) ?
 296                                         "Clear" : "Load",
 297                                 &strtab[shdr->sh_name],
 298                                 (unsigned long) shdr->sh_addr,
 299                                 (long) shdr->sh_size);
 300                 }
 301
 302                 if (shdr->sh_type == SHT_NOBITS) {
 303                         memset ((void *)shdr->sh_addr, 0, shdr->sh_size);
 304                 } else {
 305                         image = (unsigned char *) addr + shdr->sh_offset;
 306                         memcpy ((void *) shdr->sh_addr,
 307                                 (const void *) image,
 308                                 shdr->sh_size);
 309                 }
 310                 flush_cache (shdr->sh_addr, shdr->sh_size);
 311         }
 312
 313         return ehdr->e_entry;
 314 }
 315
 316 /* ====================================================================== */
 317 U_BOOT_CMD(
 318         bootelf,      2,      0,      do_bootelf,
 319         "bootelf - Boot from an ELF image in memory\n",
 320         " [address] - load address of ELF image.\n"
 321 );
 322
 323 U_BOOT_CMD(
 324         bootvx,      2,      0,      do_bootvx,
 325         "bootvx  - Boot vxWorks from an ELF image\n",
 326         " [address] - load address of vxWorks ELF image.\n"
 327 );
 328
 329 #endif  /* CFG_CMD_ELF */