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
  23 #if (CONFIG_COMMANDS & CFG_CMD_ELF)
  24
  25 #ifndef MAX
  26 #define MAX(a,b) ((a) > (b) ? (a) : (b))
  27 #endif
  28
  29 int valid_elf_image (unsigned long addr);
  30 unsigned long load_elf_image (unsigned long addr);
  31
  32 /* ======================================================================
  33  * Interpreter command to boot an arbitrary ELF image from memory.
  34  * ====================================================================== */
  35 int do_bootelf (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
  36 {
  37         unsigned long addr;             /* Address of the ELF image     */
  38         unsigned long rc;               /* Return value from user code  */
  39
  40         /* -------------------------------------------------- */
  41         int rcode = 0;
  42
  43         if (argc < 2)
  44                 addr = load_addr;
  45         else
  46                 addr = simple_strtoul (argv[1], NULL, 16);
  47
  48         if (!valid_elf_image (addr))
  49                 return 1;
  50
  51         addr = load_elf_image (addr);
  52
  53         printf ("## Starting application at 0x%08lx ...\n", addr);
  54
  55         /*
  56          * QNX images require the data cache is disabled.
  57          * Data cache is already flushed, so just turn it off.
  58          */
  59         if (dcache_status ())
  60                 dcache_disable ();
  61
  62         /*
  63          * pass address parameter as argv[0] (aka command name),
  64          * and all remaining args
  65          */
  66         rc = ((ulong (*)(int, char *[])) addr) (--argc, &argv[1]);
  67         if (rc != 0)
  68                 rcode = 1;
  69
  70         printf ("## Application terminated, rc = 0x%lx\n", rc);
  71         return rcode;
  72 }
  73
  74 /* ======================================================================
  75  * Interpreter command to boot VxWorks from a memory image.  The image can
  76  * be either an ELF image or a raw binary.  Will attempt to setup the
  77  * bootline and other parameters correctly.
  78  * ====================================================================== */
  79 int do_bootvx ( cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
  80 {
  81 #if defined(CONFIG_WALNUT405)   || \
  82     defined(CONFIG_CPCI405)     || \
  83     defined(CONFIG_OCRTC)       || \
  84     defined(CONFIG_ORSG)
  85         DECLARE_GLOBAL_DATA_PTR;
  86 #endif
  87
  88         unsigned long addr;             /* Address of image            */
  89         unsigned long bootaddr;         /* Address to put the bootline */
  90         char *bootline;                 /* Text of the bootline        */
  91         char *tmp;                      /* Temporary char pointer      */
  92
  93 #if defined(CONFIG_4xx) || defined(CONFIG_IOP480)
  94         char build_buf[80];             /* Buffer for building the bootline */
  95 #endif
  96         /* -------------------------------------------------- */
  97
  98         /*
  99          * Check the loadaddr variable.
 100          * If we don't know where the image is then we're done.
 101          */
 102
 103         if ((tmp = getenv ("loadaddr")) != NULL) {
 104                 addr = simple_strtoul (tmp, NULL, 16);
 105         } else {
 106                 printf ("No load address provided\n");
 107                 return 1;
 108         }
 109
 110 #if (CONFIG_COMMANDS & CFG_CMD_NET)
 111         /* Check to see if we need to tftp the image ourselves before starting */
 112
 113         if ((argc == 2) && (strcmp (argv[1], "tftp") == 0)) {
 114                 if (NetLoop (TFTP) <= 0)
 115                         return 1;
 116                 printf ("Automatic boot of VxWorks image at address 0x%08lx ... \n", addr);
 117         }
 118 #endif
 119
 120         /* This should equate
 121          * to NV_RAM_ADRS + NV_BOOT_OFFSET + NV_ENET_OFFSET
 122          * from the VxWorks BSP header files.
 123          * This will vary from board to board
 124          */
 125
 126 #if defined(CONFIG_WALNUT405)
 127         tmp = (char *) CFG_NVRAM_BASE_ADDR + 0x500;
 128         memcpy ((char *) tmp, (char *) &gd->bd->bi_enetaddr[3], 3);
 129 #elif defined(CONFIG_CPCI405)
 130         tmp = (char *) CFG_NVRAM_BASE_ADDR + CFG_NVRAM_VXWORKS_OFFS;
 131         memcpy ((char *) tmp, (char *) &gd->bd->bi_enetaddr[0], 6);
 132 #elif defined(CONFIG_OCRTC) || defined(CONFIG_ORSG)
 133         tmp = (char *) CFG_ETHERNET_MAC_ADDR;
 134         memcpy ((char *) tmp, (char *) &gd->bd->bi_enetaddr[0], 6);
 135 #else
 136         printf ("## Ethernet MAC address not copied to NV RAM\n");
 137 #endif
 138
 139         /*
 140          * Use bootaddr to find the location in memory that VxWorks
 141          * will look for the bootline string. The default value for
 142          * PowerPC is LOCAL_MEM_LOCAL_ADRS + BOOT_LINE_OFFSET which
 143          * defaults to 0x4200
 144          */
 145
 146         if ((tmp = getenv ("bootaddr")) == NULL)
 147                 bootaddr = 0x4200;
 148         else
 149                 bootaddr = simple_strtoul (tmp, NULL, 16);
 150
 151         /*
 152          * Check to see if the bootline is defined in the 'bootargs'
 153          * parameter. If it is not defined, we may be able to
 154          * construct the info
 155          */
 156
 157         if ((bootline = getenv ("bootargs")) != NULL) {
 158                 memcpy ((void *) bootaddr, bootline, MAX(strlen(bootline), 255));
 159                 flush_cache (bootaddr, MAX(strlen(bootline), 255));
 160         } else {
 161 #if defined(CONFIG_4xx)
 162                 sprintf (build_buf, "ibmEmac(0,0)");
 163
 164                 if ((tmp = getenv ("hostname")) != NULL) {
 165                         sprintf (&build_buf[strlen (build_buf - 1)],
 166                                 "host:%s ", tmp);
 167                 } else {
 168                         sprintf (&build_buf[strlen (build_buf - 1)],
 169                                 ": ");
 170                 }
 171
 172                 if ((tmp = getenv ("ipaddr")) != NULL) {
 173                         sprintf (&build_buf[strlen (build_buf - 1)],
 174                                 "e=%s ", tmp);
 175                 }
 176                 memcpy ((void *)bootaddr, build_buf, MAX(strlen(build_buf), 255));
 177                 flush_cache (bootaddr, MAX(strlen(build_buf), 255));
 178 #elif defined(CONFIG_IOP480)
 179                 sprintf (build_buf, "dc(0,0)");
 180
 181                 if ((tmp = getenv ("hostname")) != NULL) {
 182                         sprintf (&build_buf[strlen (build_buf - 1)],
 183                                 "host:%s ", tmp);
 184                 } else {
 185                         sprintf (&build_buf[strlen (build_buf - 1)],
 186                                 ": ");
 187                 }
 188
 189                 if ((tmp = getenv ("ipaddr")) != NULL) {
 190                         sprintf (&build_buf[strlen (build_buf - 1)],
 191                                 "e=%s ", tmp);
 192                 }
 193                 memcpy ((void *) bootaddr, build_buf, MAX(strlen(build_buf), 255));
 194                 flush_cache (bootaddr, MAX(strlen(build_buf), 255));
 195 #else
 196
 197                 /*
 198                  * I'm not sure what the device should be for other
 199                  * PPC flavors, the hostname and ipaddr should be ok
 200                  * to just copy
 201                  */
 202
 203                 printf ("No bootargs defined\n");
 204                 return 1;
 205 #endif
 206         }
 207
 208         /*
 209          * If the data at the load address is an elf image, then
 210          * treat it like an elf image. Otherwise, assume that it is a
 211          * binary image
 212          */
 213
 214         if (valid_elf_image (addr)) {
 215                 addr = load_elf_image (addr);
 216         } else {
 217                 printf ("## Not an ELF image, assuming binary\n");
 218                 /* leave addr as load_addr */
 219         }
 220
 221         printf ("## Using bootline (@ 0x%lx): %s\n", bootaddr,
 222                         (char *) bootaddr);
 223         printf ("## Starting vxWorks at 0x%08lx ...\n", addr);
 224
 225         ((void (*)(void)) addr) ();
 226
 227         printf ("## vxWorks terminated\n");
 228         return 1;
 229 }
 230
 231 /* ======================================================================
 232  * Determine if a valid ELF image exists at the given memory location.
 233  * First looks at the ELF header magic field, the makes sure that it is
 234  * executable and makes sure that it is for a PowerPC.
 235  * ====================================================================== */
 236 int valid_elf_image (unsigned long addr)
 237 {
 238         Elf32_Ehdr *ehdr;               /* Elf header structure pointer */
 239
 240         /* -------------------------------------------------- */
 241
 242         ehdr = (Elf32_Ehdr *) addr;
 243
 244         if (!IS_ELF (*ehdr)) {
 245                 printf ("## No elf image at address 0x%08lx\n", addr);
 246                 return 0;
 247         }
 248
 249         if (ehdr->e_type != ET_EXEC) {
 250                 printf ("## Not a 32-bit elf image at address 0x%08lx\n",
 251                         addr);
 252                 return 0;
 253         }
 254
 255 #if 0
 256         if (ehdr->e_machine != EM_PPC) {
 257                 printf ("## Not a PowerPC elf image at address 0x%08lx\n",
 258                         addr);
 259                 return 0;
 260         }
 261 #endif
 262
 263         return 1;
 264 }
 265
 266
 267 /* ======================================================================
 268  * A very simple elf loader, assumes the image is valid, returns the
 269  * entry point address.
 270  * ====================================================================== */
 271 unsigned long load_elf_image (unsigned long addr)
 272 {
 273         Elf32_Ehdr *ehdr;               /* Elf header structure pointer     */
 274         Elf32_Shdr *shdr;               /* Section header structure pointer */
 275         unsigned char *strtab = 0;      /* String table pointer             */
 276         unsigned char *image;           /* Binary image pointer             */
 277         int i;                          /* Loop counter                     */
 278
 279         /* -------------------------------------------------- */
 280
 281         ehdr = (Elf32_Ehdr *) addr;
 282
 283         /* Find the section header string table for output info */
 284         shdr = (Elf32_Shdr *) (addr + ehdr->e_shoff +
 285                                (ehdr->e_shstrndx * sizeof (Elf32_Shdr)));
 286
 287         if (shdr->sh_type == SHT_STRTAB)
 288                 strtab = (unsigned char *) (addr + shdr->sh_offset);
 289
 290         /* Load each appropriate section */
 291         for (i = 0; i < ehdr->e_shnum; ++i) {
 292                 shdr = (Elf32_Shdr *) (addr + ehdr->e_shoff +
 293                                        (i * sizeof (Elf32_Shdr)));
 294
 295                 if (!(shdr->sh_flags & SHF_ALLOC)
 296                    || shdr->sh_addr == 0 || shdr->sh_size == 0) {
 297                         continue;
 298                 }
 299
 300                 if (strtab) {
 301                         printf ("%sing %s @ 0x%08lx (%ld bytes)\n",
 302                                 (shdr->sh_type == SHT_NOBITS) ?
 303                                         "Clear" : "Load",
 304                                 &strtab[shdr->sh_name],
 305                                 (unsigned long) shdr->sh_addr,
 306                                 (long) shdr->sh_size);
 307                 }
 308
 309                 if (shdr->sh_type == SHT_NOBITS) {
 310                         memset ((void *)shdr->sh_addr, 0, shdr->sh_size);
 311                 } else {
 312                         image = (unsigned char *) addr + shdr->sh_offset;
 313                         memcpy ((void *) shdr->sh_addr,
 314                                 (const void *) image,
 315                                 shdr->sh_size);
 316                 }
 317                 flush_cache (shdr->sh_addr, shdr->sh_size);
 318         }
 319
 320         return ehdr->e_entry;
 321 }
 322
 323 /* ====================================================================== */
 324 U_BOOT_CMD(
 325         bootelf,      2,      0,      do_bootelf,
 326         "bootelf - Boot from an ELF image in memory\n",
 327         " [address] - load address of ELF image.\n"
 328 );
 329
 330 U_BOOT_CMD(
 331         bootvx,      2,      0,      do_bootvx,
 332         "bootvx  - Boot vxWorks from an ELF image\n",
 333         " [address] - load address of vxWorks ELF image.\n"
 334 );
 335
 336 #endif  /* CFG_CMD_ELF */