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 <elf.h>
  19 #include <environment.h>
  20 #include <net.h>
  21 #include <vxworks.h>
  22 #ifdef CONFIG_X86
  23 #include <vbe.h>
  24 #include <asm/e820.h>
  25 #include <linux/linkage.h>
  26 #endif
  27
  28 /*
  29  * A very simple ELF64 loader, assumes the image is valid, returns the
  30  * entry point address.
  31  *
  32  * Note if U-Boot is 32-bit, the loader assumes the to segment's
  33  * physical address and size is within the lower 32-bit address space.
  34  */
  35 static unsigned long load_elf64_image_phdr(unsigned long addr)
  36 {
  37         Elf64_Ehdr *ehdr; /* Elf header structure pointer */
  38         Elf64_Phdr *phdr; /* Program header structure pointer */
  39         int i;
  40
  41         ehdr = (Elf64_Ehdr *)addr;
  42         phdr = (Elf64_Phdr *)(addr + (ulong)ehdr->e_phoff);
  43
  44         /* Load each program header */
  45         for (i = 0; i < ehdr->e_phnum; ++i) {
  46                 void *dst = (void *)(ulong)phdr->p_paddr;
  47                 void *src = (void *)addr + phdr->p_offset;
  48
  49                 debug("Loading phdr %i to 0x%p (%lu bytes)\n",
  50                       i, dst, (ulong)phdr->p_filesz);
  51                 if (phdr->p_filesz)
  52                         memcpy(dst, src, phdr->p_filesz);
  53                 if (phdr->p_filesz != phdr->p_memsz)
  54                         memset(dst + phdr->p_filesz, 0x00,
  55                                phdr->p_memsz - phdr->p_filesz);
  56                 flush_cache(rounddown((unsigned long)dst, ARCH_DMA_MINALIGN),
  57                             roundup(phdr->p_memsz, ARCH_DMA_MINALIGN));
  58                 ++phdr;
  59         }
  60
  61         if (ehdr->e_machine == EM_PPC64 && (ehdr->e_flags &
  62                                             EF_PPC64_ELFV1_ABI)) {
  63                 /*
  64                  * For the 64-bit PowerPC ELF V1 ABI, e_entry is a function
  65                  * descriptor pointer with the first double word being the
  66                  * address of the entry point of the function.
  67                  */
  68                 uintptr_t addr = ehdr->e_entry;
  69
  70                 return *(Elf64_Addr *)addr;
  71         }
  72
  73         return ehdr->e_entry;
  74 }
  75
  76 static unsigned long load_elf64_image_shdr(unsigned long addr)
  77 {
  78         Elf64_Ehdr *ehdr; /* Elf header structure pointer */
  79         Elf64_Shdr *shdr; /* Section header structure pointer */
  80         unsigned char *strtab = 0; /* String table pointer */
  81         unsigned char *image; /* Binary image pointer */
  82         int i; /* Loop counter */
  83
  84         ehdr = (Elf64_Ehdr *)addr;
  85
  86         /* Find the section header string table for output info */
  87         shdr = (Elf64_Shdr *)(addr + (ulong)ehdr->e_shoff +
  88                              (ehdr->e_shstrndx * sizeof(Elf64_Shdr)));
  89
  90         if (shdr->sh_type == SHT_STRTAB)
  91                 strtab = (unsigned char *)(addr + (ulong)shdr->sh_offset);
  92
  93         /* Load each appropriate section */
  94         for (i = 0; i < ehdr->e_shnum; ++i) {
  95                 shdr = (Elf64_Shdr *)(addr + (ulong)ehdr->e_shoff +
  96                                      (i * sizeof(Elf64_Shdr)));
  97
  98                 if (!(shdr->sh_flags & SHF_ALLOC) ||
  99                     shdr->sh_addr == 0 || shdr->sh_size == 0) {
 100                         continue;
 101                 }
 102
 103                 if (strtab) {
 104                         debug("%sing %s @ 0x%08lx (%ld bytes)\n",
 105                               (shdr->sh_type == SHT_NOBITS) ? "Clear" : "Load",
 106                                &strtab[shdr->sh_name],
 107                                (unsigned long)shdr->sh_addr,
 108                                (long)shdr->sh_size);
 109                 }
 110
 111                 if (shdr->sh_type == SHT_NOBITS) {
 112                         memset((void *)(uintptr_t)shdr->sh_addr, 0,
 113                                shdr->sh_size);
 114                 } else {
 115                         image = (unsigned char *)addr + (ulong)shdr->sh_offset;
 116                         memcpy((void *)(uintptr_t)shdr->sh_addr,
 117                                (const void *)image, shdr->sh_size);
 118                 }
 119                 flush_cache(rounddown(shdr->sh_addr, ARCH_DMA_MINALIGN),
 120                             roundup((shdr->sh_addr + shdr->sh_size),
 121                                      ARCH_DMA_MINALIGN) -
 122                                     rounddown(shdr->sh_addr, ARCH_DMA_MINALIGN));
 123         }
 124
 125         if (ehdr->e_machine == EM_PPC64 && (ehdr->e_flags &
 126                                             EF_PPC64_ELFV1_ABI)) {
 127                 /*
 128                  * For the 64-bit PowerPC ELF V1 ABI, e_entry is a function
 129                  * descriptor pointer with the first double word being the
 130                  * address of the entry point of the function.
 131                  */
 132                 uintptr_t addr = ehdr->e_entry;
 133
 134                 return *(Elf64_Addr *)addr;
 135         }
 136
 137         return ehdr->e_entry;
 138 }
 139
 140 /*
 141  * A very simple ELF loader, assumes the image is valid, returns the
 142  * entry point address.
 143  *
 144  * The loader firstly reads the EFI class to see if it's a 64-bit image.
 145  * If yes, call the ELF64 loader. Otherwise continue with the ELF32 loader.
 146  */
 147 static unsigned long load_elf_image_phdr(unsigned long addr)
 148 {
 149         Elf32_Ehdr *ehdr; /* Elf header structure pointer */
 150         Elf32_Phdr *phdr; /* Program header structure pointer */
 151         int i;
 152
 153         ehdr = (Elf32_Ehdr *)addr;
 154         if (ehdr->e_ident[EI_CLASS] == ELFCLASS64)
 155                 return load_elf64_image_phdr(addr);
 156
 157         phdr = (Elf32_Phdr *)(addr + ehdr->e_phoff);
 158
 159         /* Load each program header */
 160         for (i = 0; i < ehdr->e_phnum; ++i) {
 161                 void *dst = (void *)(uintptr_t)phdr->p_paddr;
 162                 void *src = (void *)addr + phdr->p_offset;
 163
 164                 debug("Loading phdr %i to 0x%p (%i bytes)\n",
 165                       i, dst, phdr->p_filesz);
 166                 if (phdr->p_filesz)
 167                         memcpy(dst, src, phdr->p_filesz);
 168                 if (phdr->p_filesz != phdr->p_memsz)
 169                         memset(dst + phdr->p_filesz, 0x00,
 170                                phdr->p_memsz - phdr->p_filesz);
 171                 flush_cache(rounddown((unsigned long)dst, ARCH_DMA_MINALIGN),
 172                             roundup(phdr->p_memsz, ARCH_DMA_MINALIGN));
 173                 ++phdr;
 174         }
 175
 176         return ehdr->e_entry;
 177 }
 178
 179 static unsigned long load_elf_image_shdr(unsigned long addr)
 180 {
 181         Elf32_Ehdr *ehdr; /* Elf header structure pointer */
 182         Elf32_Shdr *shdr; /* Section header structure pointer */
 183         unsigned char *strtab = 0; /* String table pointer */
 184         unsigned char *image; /* Binary image pointer */
 185         int i; /* Loop counter */
 186
 187         ehdr = (Elf32_Ehdr *)addr;
 188         if (ehdr->e_ident[EI_CLASS] == ELFCLASS64)
 189                 return load_elf64_image_shdr(addr);
 190
 191         /* Find the section header string table for output info */
 192         shdr = (Elf32_Shdr *)(addr + ehdr->e_shoff +
 193                              (ehdr->e_shstrndx * sizeof(Elf32_Shdr)));
 194
 195         if (shdr->sh_type == SHT_STRTAB)
 196                 strtab = (unsigned char *)(addr + shdr->sh_offset);
 197
 198         /* Load each appropriate section */
 199         for (i = 0; i < ehdr->e_shnum; ++i) {
 200                 shdr = (Elf32_Shdr *)(addr + ehdr->e_shoff +
 201                                      (i * sizeof(Elf32_Shdr)));
 202
 203                 if (!(shdr->sh_flags & SHF_ALLOC) ||
 204                     shdr->sh_addr == 0 || shdr->sh_size == 0) {
 205                         continue;
 206                 }
 207
 208                 if (strtab) {
 209                         debug("%sing %s @ 0x%08lx (%ld bytes)\n",
 210                               (shdr->sh_type == SHT_NOBITS) ? "Clear" : "Load",
 211                                &strtab[shdr->sh_name],
 212                                (unsigned long)shdr->sh_addr,
 213                                (long)shdr->sh_size);
 214                 }
 215
 216                 if (shdr->sh_type == SHT_NOBITS) {
 217                         memset((void *)(uintptr_t)shdr->sh_addr, 0,
 218                                shdr->sh_size);
 219                 } else {
 220                         image = (unsigned char *)addr + shdr->sh_offset;
 221                         memcpy((void *)(uintptr_t)shdr->sh_addr,
 222                                (const void *)image, shdr->sh_size);
 223                 }
 224                 flush_cache(rounddown(shdr->sh_addr, ARCH_DMA_MINALIGN),
 225                             roundup((shdr->sh_addr + shdr->sh_size),
 226                                     ARCH_DMA_MINALIGN) -
 227                             rounddown(shdr->sh_addr, ARCH_DMA_MINALIGN));
 228         }
 229
 230         return ehdr->e_entry;
 231 }
 232
 233 /* Allow ports to override the default behavior */
 234 static unsigned long do_bootelf_exec(ulong (*entry)(int, char * const[]),
 235                                      int argc, char * const argv[])
 236 {
 237         unsigned long ret;
 238
 239         /*
 240          * pass address parameter as argv[0] (aka command name),
 241          * and all remaining args
 242          */
 243         ret = entry(argc, argv);
 244
 245         return ret;
 246 }
 247
 248 /*
 249  * Determine if a valid ELF image exists at the given memory location.
 250  * First look at the ELF header magic field, then make sure that it is
 251  * executable.
 252  */
 253 int valid_elf_image(unsigned long addr)
 254 {
 255         Elf32_Ehdr *ehdr; /* Elf header structure pointer */
 256
 257         ehdr = (Elf32_Ehdr *)addr;
 258
 259         if (!IS_ELF(*ehdr)) {
 260                 printf("## No elf image at address 0x%08lx\n", addr);
 261                 return 0;
 262         }
 263
 264         if (ehdr->e_type != ET_EXEC) {
 265                 printf("## Not a 32-bit elf image at address 0x%08lx\n", addr);
 266                 return 0;
 267         }
 268
 269         return 1;
 270 }
 271
 272 /* Interpreter command to boot an arbitrary ELF image from memory */
 273 int do_bootelf(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 274 {
 275         unsigned long addr; /* Address of the ELF image */
 276         unsigned long rc; /* Return value from user code */
 277         char *sload = NULL;
 278         const char *ep = env_get("autostart");
 279         int rcode = 0;
 280
 281         /* Consume 'bootelf' */
 282         argc--; argv++;
 283
 284         /* Check for flag. */
 285         if (argc >= 1 && (argv[0][0] == '-' && \
 286                                 (argv[0][1] == 'p' || argv[0][1] == 's'))) {
 287                 sload = argv[0];
 288                 /* Consume flag. */
 289                 argc--; argv++;
 290         }
 291         /* Check for address. */
 292         if (argc >= 1 && strict_strtoul(argv[0], 16, &addr) != -EINVAL) {
 293                 /* Consume address */
 294                 argc--; argv++;
 295         } else
 296                 addr = load_addr;
 297
 298         if (!valid_elf_image(addr))
 299                 return 1;
 300
 301         if (sload && sload[1] == 'p')
 302                 addr = load_elf_image_phdr(addr);
 303         else
 304                 addr = load_elf_image_shdr(addr);
 305
 306         if (ep && !strcmp(ep, "no"))
 307                 return rcode;
 308
 309         printf("## Starting application at 0x%08lx ...\n", addr);
 310
 311         /*
 312          * pass address parameter as argv[0] (aka command name),
 313          * and all remaining args
 314          */
 315         rc = do_bootelf_exec((void *)addr, argc, argv);
 316         if (rc != 0)
 317                 rcode = 1;
 318
 319         printf("## Application terminated, rc = 0x%lx\n", rc);
 320
 321         return rcode;
 322 }
 323
 324 /*
 325  * Interpreter command to boot VxWorks from a memory image.  The image can
 326  * be either an ELF image or a raw binary.  Will attempt to setup the
 327  * bootline and other parameters correctly.
 328  */
 329 int do_bootvx(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 330 {
 331         unsigned long addr; /* Address of image */
 332         unsigned long bootaddr = 0; /* Address to put the bootline */
 333         char *bootline; /* Text of the bootline */
 334         char *tmp; /* Temporary char pointer */
 335         char build_buf[128]; /* Buffer for building the bootline */
 336         int ptr = 0;
 337 #ifdef CONFIG_X86
 338         ulong base;
 339         struct e820_info *info;
 340         struct e820_entry *data;
 341         struct efi_gop_info *gop;
 342         struct vesa_mode_info *vesa = &mode_info.vesa;
 343 #endif
 344
 345         /*
 346          * Check the loadaddr variable.
 347          * If we don't know where the image is then we're done.
 348          */
 349         if (argc < 2)
 350                 addr = load_addr;
 351         else
 352                 addr = simple_strtoul(argv[1], NULL, 16);
 353
 354 #if defined(CONFIG_CMD_NET)
 355         /*
 356          * Check to see if we need to tftp the image ourselves
 357          * before starting
 358          */
 359         if ((argc == 2) && (strcmp(argv[1], "tftp") == 0)) {
 360                 if (net_loop(TFTPGET) <= 0)
 361                         return 1;
 362                 printf("Automatic boot of VxWorks image at address 0x%08lx ...\n",
 363                         addr);
 364         }
 365 #endif
 366
 367         /*
 368          * This should equate to
 369          * NV_RAM_ADRS + NV_BOOT_OFFSET + NV_ENET_OFFSET
 370          * from the VxWorks BSP header files.
 371          * This will vary from board to board
 372          */
 373 #if defined(CONFIG_SYS_VXWORKS_MAC_PTR)
 374         tmp = (char *)CONFIG_SYS_VXWORKS_MAC_PTR;
 375         eth_env_get_enetaddr("ethaddr", (uchar *)build_buf);
 376         memcpy(tmp, build_buf, 6);
 377 #else
 378         puts("## Ethernet MAC address not copied to NV RAM\n");
 379 #endif
 380
 381 #ifdef CONFIG_X86
 382         /*
 383          * Get VxWorks's physical memory base address from environment,
 384          * if we don't specify it in the environment, use a default one.
 385          */
 386         base = env_get_hex("vx_phys_mem_base", VXWORKS_PHYS_MEM_BASE);
 387         data = (struct e820_entry *)(base + E820_DATA_OFFSET);
 388         info = (struct e820_info *)(base + E820_INFO_OFFSET);
 389
 390         memset(info, 0, sizeof(struct e820_info));
 391         info->sign = E820_SIGNATURE;
 392         info->entries = install_e820_map(E820MAX, data);
 393         info->addr = (info->entries - 1) * sizeof(struct e820_entry) +
 394                      E820_DATA_OFFSET;
 395
 396         /*
 397          * Explicitly clear the bootloader image size otherwise if memory
 398          * at this offset happens to contain some garbage data, the final
 399          * available memory size for the kernel is insane.
 400          */
 401         *(u32 *)(base + BOOT_IMAGE_SIZE_OFFSET) = 0;
 402
 403         /*
 404          * Prepare compatible framebuffer information block.
 405          * The VESA mode has to be 32-bit RGBA.
 406          */
 407         if (vesa->x_resolution && vesa->y_resolution) {
 408                 gop = (struct efi_gop_info *)(base + EFI_GOP_INFO_OFFSET);
 409                 gop->magic = EFI_GOP_INFO_MAGIC;
 410                 gop->info.version = 0;
 411                 gop->info.width = vesa->x_resolution;
 412                 gop->info.height = vesa->y_resolution;
 413                 gop->info.pixel_format = EFI_GOT_RGBA8;
 414                 gop->info.pixels_per_scanline = vesa->bytes_per_scanline / 4;
 415                 gop->fb_base = vesa->phys_base_ptr;
 416                 gop->fb_size = vesa->bytes_per_scanline * vesa->y_resolution;
 417         }
 418 #endif
 419
 420         /*
 421          * Use bootaddr to find the location in memory that VxWorks
 422          * will look for the bootline string. The default value is
 423          * (LOCAL_MEM_LOCAL_ADRS + BOOT_LINE_OFFSET) as defined by
 424          * VxWorks BSP. For example, on PowerPC it defaults to 0x4200.
 425          */
 426         tmp = env_get("bootaddr");
 427         if (!tmp) {
 428 #ifdef CONFIG_X86
 429                 bootaddr = base + X86_BOOT_LINE_OFFSET;
 430 #else
 431                 printf("## VxWorks bootline address not specified\n");
 432                 return 1;
 433 #endif
 434         }
 435
 436         if (!bootaddr)
 437                 bootaddr = simple_strtoul(tmp, NULL, 16);
 438
 439         /*
 440          * Check to see if the bootline is defined in the 'bootargs' parameter.
 441          * If it is not defined, we may be able to construct the info.
 442          */
 443         bootline = env_get("bootargs");
 444         if (!bootline) {
 445                 tmp = env_get("bootdev");
 446                 if (tmp) {
 447                         strcpy(build_buf, tmp);
 448                         ptr = strlen(tmp);
 449                 } else {
 450                         printf("## VxWorks boot device not specified\n");
 451                 }
 452
 453                 tmp = env_get("bootfile");
 454                 if (tmp)
 455                         ptr += sprintf(build_buf + ptr, "host:%s ", tmp);
 456                 else
 457                         ptr += sprintf(build_buf + ptr, "host:vxWorks ");
 458
 459                 /*
 460                  * The following parameters are only needed if 'bootdev'
 461                  * is an ethernet device, otherwise they are optional.
 462                  */
 463                 tmp = env_get("ipaddr");
 464                 if (tmp) {
 465                         ptr += sprintf(build_buf + ptr, "e=%s", tmp);
 466                         tmp = env_get("netmask");
 467                         if (tmp) {
 468                                 u32 mask = env_get_ip("netmask").s_addr;
 469                                 ptr += sprintf(build_buf + ptr,
 470                                                ":%08x ", ntohl(mask));
 471                         } else {
 472                                 ptr += sprintf(build_buf + ptr, " ");
 473                         }
 474                 }
 475
 476                 tmp = env_get("serverip");
 477                 if (tmp)
 478                         ptr += sprintf(build_buf + ptr, "h=%s ", tmp);
 479
 480                 tmp = env_get("gatewayip");
 481                 if (tmp)
 482                         ptr += sprintf(build_buf + ptr, "g=%s ", tmp);
 483
 484                 tmp = env_get("hostname");
 485                 if (tmp)
 486                         ptr += sprintf(build_buf + ptr, "tn=%s ", tmp);
 487
 488                 tmp = env_get("othbootargs");
 489                 if (tmp) {
 490                         strcpy(build_buf + ptr, tmp);
 491                         ptr += strlen(tmp);
 492                 }
 493
 494                 bootline = build_buf;
 495         }
 496
 497         memcpy((void *)bootaddr, bootline, max(strlen(bootline), (size_t)255));
 498         flush_cache(bootaddr, max(strlen(bootline), (size_t)255));
 499         printf("## Using bootline (@ 0x%lx): %s\n", bootaddr, (char *)bootaddr);
 500
 501         /*
 502          * If the data at the load address is an elf image, then
 503          * treat it like an elf image. Otherwise, assume that it is a
 504          * binary image.
 505          */
 506         if (valid_elf_image(addr))
 507                 addr = load_elf_image_phdr(addr);
 508         else
 509                 puts("## Not an ELF image, assuming binary\n");
 510
 511         printf("## Starting vxWorks at 0x%08lx ...\n", addr);
 512
 513         dcache_disable();
 514 #if defined(CONFIG_ARM64) && defined(CONFIG_ARMV8_PSCI)
 515         armv8_setup_psci();
 516         smp_kick_all_cpus();
 517 #endif
 518
 519 #ifdef CONFIG_X86
 520         /* VxWorks on x86 uses stack to pass parameters */
 521         ((asmlinkage void (*)(int))addr)(0);
 522 #else
 523         ((void (*)(int))addr)(0);
 524 #endif
 525
 526         puts("## vxWorks terminated\n");
 527
 528         return 1;
 529 }
 530
 531 U_BOOT_CMD(
 532         bootelf, CONFIG_SYS_MAXARGS, 0, do_bootelf,
 533         "Boot from an ELF image in memory",
 534         "[-p|-s] [address]\n"
 535         "\t- load ELF image at [address] via program headers (-p)\n"
 536         "\t  or via section headers (-s)"
 537 );
 538
 539 U_BOOT_CMD(
 540         bootvx, 2, 0, do_bootvx,
 541         "Boot vxWorks from an ELF image",
 542         " [address] - load address of vxWorks ELF image."
 543 );