cmd_elf.c 10 KB

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