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 <bootm.h>
  18 #include <command.h>
  19 #include <linux/ctype.h>
  20 #include <net.h>
  21 #include <elf.h>
  22 #include <vxworks.h>
  23
  24 #if defined(CONFIG_WALNUT) || defined(CONFIG_SYS_VXWORKS_MAC_PTR)
  25 DECLARE_GLOBAL_DATA_PTR;
  26 #endif
  27
  28 static unsigned long load_elf_image_phdr(unsigned long addr);
  29 static unsigned long load_elf_image_shdr(unsigned long addr);
  30
  31 /* Allow ports to override the default behavior */
  32 static unsigned long do_bootelf_exec(ulong (*entry)(int, char * const[]),
  33                                int argc, char * const argv[])
  34 {
  35         unsigned long ret;
  36
  37         /*
  38          * QNX images require the data cache is disabled.
  39          * Data cache is already flushed, so just turn it off.
  40          */
  41         int dcache = dcache_status();
  42         if (dcache)
  43                 dcache_disable();
  44
  45         /*
  46          * pass address parameter as argv[0] (aka command name),
  47          * and all remaining args
  48          */
  49         ret = entry(argc, argv);
  50
  51         if (dcache)
  52                 dcache_enable();
  53
  54         return ret;
  55 }
  56
  57 /* ======================================================================
  58  * Determine if a valid ELF image exists at the given memory location.
  59  * First looks at the ELF header magic field, the makes sure that it is
  60  * executable and makes sure that it is for a PowerPC.
  61  * ====================================================================== */
  62 int valid_elf_image(unsigned long addr)
  63 {
  64         Elf32_Ehdr *ehdr;               /* Elf header structure pointer */
  65
  66         /* -------------------------------------------------- */
  67
  68         ehdr = (Elf32_Ehdr *) addr;
  69
  70         if (!IS_ELF(*ehdr)) {
  71                 printf("## No elf image at address 0x%08lx\n", addr);
  72                 return 0;
  73         }
  74
  75         if (ehdr->e_type != ET_EXEC) {
  76                 printf("## Not a 32-bit elf image at address 0x%08lx\n", addr);
  77                 return 0;
  78         }
  79
  80 #if 0
  81         if (ehdr->e_machine != EM_PPC) {
  82                 printf("## Not a PowerPC elf image at address 0x%08lx\n", addr);
  83                 return 0;
  84         }
  85 #endif
  86
  87         return 1;
  88 }
  89
  90 /* ======================================================================
  91  * Interpreter command to boot an arbitrary ELF image from memory.
  92  * ====================================================================== */
  93 int do_bootelf(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
  94 {
  95         unsigned long addr;             /* Address of the ELF image     */
  96         unsigned long rc;               /* Return value from user code  */
  97         char *sload, *saddr;
  98
  99         /* -------------------------------------------------- */
 100         int rcode = 0;
 101
 102         sload = saddr = NULL;
 103         if (argc == 3) {
 104                 sload = argv[1];
 105                 saddr = argv[2];
 106         } else if (argc == 2) {
 107                 if (argv[1][0] == '-')
 108                         sload = argv[1];
 109                 else
 110                         saddr = argv[1];
 111         }
 112
 113         if (saddr)
 114                 addr = simple_strtoul(saddr, NULL, 16);
 115         else
 116                 addr = load_addr;
 117
 118         if (!valid_elf_image(addr))
 119                 return 1;
 120
 121         if (sload && sload[1] == 'p')
 122                 addr = load_elf_image_phdr(addr);
 123         else
 124                 addr = load_elf_image_shdr(addr);
 125
 126         printf("## Starting application at 0x%08lx ...\n", addr);
 127
 128         /*
 129          * pass address parameter as argv[0] (aka command name),
 130          * and all remaining args
 131          */
 132         rc = do_bootelf_exec((void *)addr, argc - 1, argv + 1);
 133         if (rc != 0)
 134                 rcode = 1;
 135
 136         printf("## Application terminated, rc = 0x%lx\n", rc);
 137         return rcode;
 138 }
 139
 140 /* ======================================================================
 141  * Interpreter command to boot VxWorks from a memory image.  The image can
 142  * be either an ELF image or a raw binary.  Will attempt to setup the
 143  * bootline and other parameters correctly.
 144  * ====================================================================== */
 145 int do_bootvx(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 146 {
 147         unsigned long addr;             /* Address of image            */
 148         unsigned long bootaddr; /* Address to put the bootline */
 149         char *bootline;                 /* Text of the bootline        */
 150         char *tmp;                      /* Temporary char pointer      */
 151         char build_buf[128];            /* Buffer for building the bootline */
 152
 153         /* ---------------------------------------------------
 154          *
 155          * Check the loadaddr variable.
 156          * If we don't know where the image is then we're done.
 157          */
 158
 159         if (argc < 2)
 160                 addr = load_addr;
 161         else
 162                 addr = simple_strtoul(argv[1], NULL, 16);
 163
 164 #if defined(CONFIG_CMD_NET)
 165         /*
 166          * Check to see if we need to tftp the image ourselves before starting
 167          */
 168         if ((argc == 2) && (strcmp(argv[1], "tftp") == 0)) {
 169                 if (NetLoop(TFTPGET) <= 0)
 170                         return 1;
 171                 printf("Automatic boot of VxWorks image at address 0x%08lx ...\n",
 172                         addr);
 173         }
 174 #endif
 175
 176         /* This should equate
 177          * to NV_RAM_ADRS + NV_BOOT_OFFSET + NV_ENET_OFFSET
 178          * from the VxWorks BSP header files.
 179          * This will vary from board to board
 180          */
 181
 182 #if defined(CONFIG_WALNUT)
 183         tmp = (char *) CONFIG_SYS_NVRAM_BASE_ADDR + 0x500;
 184         eth_getenv_enetaddr("ethaddr", (uchar *)build_buf);
 185         memcpy(tmp, &build_buf[3], 3);
 186 #elif defined(CONFIG_SYS_VXWORKS_MAC_PTR)
 187         tmp = (char *) CONFIG_SYS_VXWORKS_MAC_PTR;
 188         eth_getenv_enetaddr("ethaddr", (uchar *)build_buf);
 189         memcpy(tmp, build_buf, 6);
 190 #else
 191         puts("## Ethernet MAC address not copied to NV RAM\n");
 192 #endif
 193
 194         /*
 195          * Use bootaddr to find the location in memory that VxWorks
 196          * will look for the bootline string. The default value for
 197          * PowerPC is LOCAL_MEM_LOCAL_ADRS + BOOT_LINE_OFFSET which
 198          * defaults to 0x4200
 199          */
 200         tmp = getenv("bootaddr");
 201         if (!tmp)
 202                 bootaddr = CONFIG_SYS_VXWORKS_BOOT_ADDR;
 203         else
 204                 bootaddr = simple_strtoul(tmp, NULL, 16);
 205
 206         /*
 207          * Check to see if the bootline is defined in the 'bootargs'
 208          * parameter. If it is not defined, we may be able to
 209          * construct the info
 210          */
 211         bootline = getenv("bootargs");
 212         if (bootline) {
 213                 memcpy((void *)bootaddr, bootline,
 214                        max(strlen(bootline), (size_t)255));
 215                 flush_cache(bootaddr, max(strlen(bootline), (size_t)255));
 216         } else {
 217                 sprintf(build_buf, CONFIG_SYS_VXWORKS_BOOT_DEVICE);
 218                 tmp = getenv("bootfile");
 219                 if (tmp)
 220                         sprintf(&build_buf[strlen(build_buf)],
 221                                  "%s:%s ", CONFIG_SYS_VXWORKS_SERVERNAME, tmp);
 222                 else
 223                         sprintf(&build_buf[strlen(build_buf)],
 224                                  "%s:file ", CONFIG_SYS_VXWORKS_SERVERNAME);
 225
 226                 tmp = getenv("ipaddr");
 227                 if (tmp)
 228                         sprintf(&build_buf[strlen(build_buf)], "e=%s ", tmp);
 229
 230                 tmp = getenv("serverip");
 231                 if (tmp)
 232                         sprintf(&build_buf[strlen(build_buf)], "h=%s ", tmp);
 233
 234                 tmp = getenv("hostname");
 235                 if (tmp)
 236                         sprintf(&build_buf[strlen(build_buf)], "tn=%s ", tmp);
 237
 238 #ifdef CONFIG_SYS_VXWORKS_ADD_PARAMS
 239                 sprintf(&build_buf[strlen(build_buf)],
 240                          CONFIG_SYS_VXWORKS_ADD_PARAMS);
 241 #endif
 242
 243                 memcpy((void *)bootaddr, build_buf,
 244                        max(strlen(build_buf), (size_t)255));
 245                 flush_cache(bootaddr, max(strlen(build_buf), (size_t)255));
 246         }
 247
 248         /*
 249          * If the data at the load address is an elf image, then
 250          * treat it like an elf image. Otherwise, assume that it is a
 251          * binary image
 252          */
 253
 254         if (valid_elf_image(addr)) {
 255                 addr = load_elf_image_shdr(addr);
 256         } else {
 257                 puts("## Not an ELF image, assuming binary\n");
 258                 /* leave addr as load_addr */
 259         }
 260
 261         printf("## Using bootline (@ 0x%lx): %s\n", bootaddr,
 262                         (char *) bootaddr);
 263         printf("## Starting vxWorks at 0x%08lx ...\n", addr);
 264
 265         dcache_disable();
 266         ((void (*)(int)) addr) (0);
 267
 268         puts("## vxWorks terminated\n");
 269         return 1;
 270 }
 271
 272 /* ======================================================================
 273  * A very simple elf loader, assumes the image is valid, returns the
 274  * entry point address.
 275  * ====================================================================== */
 276 static unsigned long load_elf_image_phdr(unsigned long addr)
 277 {
 278         Elf32_Ehdr *ehdr;               /* Elf header structure pointer     */
 279         Elf32_Phdr *phdr;               /* Program header structure pointer */
 280         int i;
 281
 282         ehdr = (Elf32_Ehdr *) addr;
 283         phdr = (Elf32_Phdr *) (addr + ehdr->e_phoff);
 284
 285         /* Load each program header */
 286         for (i = 0; i < ehdr->e_phnum; ++i) {
 287                 void *dst = (void *)(uintptr_t) phdr->p_paddr;
 288                 void *src = (void *) addr + phdr->p_offset;
 289                 debug("Loading phdr %i to 0x%p (%i bytes)\n",
 290                         i, dst, phdr->p_filesz);
 291                 if (phdr->p_filesz)
 292                         memcpy(dst, src, phdr->p_filesz);
 293                 if (phdr->p_filesz != phdr->p_memsz)
 294                         memset(dst + phdr->p_filesz, 0x00,
 295                                 phdr->p_memsz - phdr->p_filesz);
 296                 flush_cache((unsigned long)dst, phdr->p_filesz);
 297                 ++phdr;
 298         }
 299
 300         return ehdr->e_entry;
 301 }
 302
 303 static unsigned long load_elf_image_shdr(unsigned long addr)
 304 {
 305         Elf32_Ehdr *ehdr;               /* Elf header structure pointer     */
 306         Elf32_Shdr *shdr;               /* Section header structure pointer */
 307         unsigned char *strtab = 0;      /* String table pointer             */
 308         unsigned char *image;           /* Binary image pointer             */
 309         int i;                          /* Loop counter                     */
 310
 311         /* -------------------------------------------------- */
 312
 313         ehdr = (Elf32_Ehdr *) addr;
 314
 315         /* Find the section header string table for output info */
 316         shdr = (Elf32_Shdr *) (addr + ehdr->e_shoff +
 317                                (ehdr->e_shstrndx * sizeof(Elf32_Shdr)));
 318
 319         if (shdr->sh_type == SHT_STRTAB)
 320                 strtab = (unsigned char *) (addr + shdr->sh_offset);
 321
 322         /* Load each appropriate section */
 323         for (i = 0; i < ehdr->e_shnum; ++i) {
 324                 shdr = (Elf32_Shdr *) (addr + ehdr->e_shoff +
 325                                        (i * sizeof(Elf32_Shdr)));
 326
 327                 if (!(shdr->sh_flags & SHF_ALLOC)
 328                    || shdr->sh_addr == 0 || shdr->sh_size == 0) {
 329                         continue;
 330                 }
 331
 332                 if (strtab) {
 333                         debug("%sing %s @ 0x%08lx (%ld bytes)\n",
 334                                 (shdr->sh_type == SHT_NOBITS) ?
 335                                         "Clear" : "Load",
 336                                 &strtab[shdr->sh_name],
 337                                 (unsigned long) shdr->sh_addr,
 338                                 (long) shdr->sh_size);
 339                 }
 340
 341                 if (shdr->sh_type == SHT_NOBITS) {
 342                         memset((void *)(uintptr_t) shdr->sh_addr, 0,
 343                                 shdr->sh_size);
 344                 } else {
 345                         image = (unsigned char *) addr + shdr->sh_offset;
 346                         memcpy((void *)(uintptr_t) shdr->sh_addr,
 347                                 (const void *) image,
 348                                 shdr->sh_size);
 349                 }
 350                 flush_cache(shdr->sh_addr, shdr->sh_size);
 351         }
 352
 353         return ehdr->e_entry;
 354 }
 355
 356 /* ====================================================================== */
 357 U_BOOT_CMD(
 358         bootelf,      3,      0,      do_bootelf,
 359         "Boot from an ELF image in memory",
 360         "[-p|-s] [address]\n"
 361         "\t- load ELF image at [address] via program headers (-p)\n"
 362         "\t  or via section headers (-s)"
 363 );
 364
 365 U_BOOT_CMD(
 366         bootvx,      2,      0,      do_bootvx,
 367         "Boot vxWorks from an ELF image",
 368         " [address] - load address of vxWorks ELF image."
 369 );