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