2 * Copyright (c) 2001 William L. Pitts
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
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
23 #include <linux/linkage.h>
27 * A very simple elf loader, assumes the image is valid, returns the
28 * entry point address.
30 static unsigned long load_elf_image_phdr(unsigned long addr)
32 Elf32_Ehdr *ehdr; /* Elf header structure pointer */
33 Elf32_Phdr *phdr; /* Program header structure pointer */
36 ehdr = (Elf32_Ehdr *)addr;
37 phdr = (Elf32_Phdr *)(addr + ehdr->e_phoff);
39 /* Load each program header */
40 for (i = 0; i < ehdr->e_phnum; ++i) {
41 void *dst = (void *)(uintptr_t)phdr->p_paddr;
42 void *src = (void *)addr + phdr->p_offset;
43 debug("Loading phdr %i to 0x%p (%i bytes)\n",
44 i, dst, phdr->p_filesz);
46 memcpy(dst, src, phdr->p_filesz);
47 if (phdr->p_filesz != phdr->p_memsz)
48 memset(dst + phdr->p_filesz, 0x00,
49 phdr->p_memsz - phdr->p_filesz);
50 flush_cache((unsigned long)dst, phdr->p_filesz);
57 static unsigned long load_elf_image_shdr(unsigned long addr)
59 Elf32_Ehdr *ehdr; /* Elf header structure pointer */
60 Elf32_Shdr *shdr; /* Section header structure pointer */
61 unsigned char *strtab = 0; /* String table pointer */
62 unsigned char *image; /* Binary image pointer */
63 int i; /* Loop counter */
65 ehdr = (Elf32_Ehdr *)addr;
67 /* Find the section header string table for output info */
68 shdr = (Elf32_Shdr *)(addr + ehdr->e_shoff +
69 (ehdr->e_shstrndx * sizeof(Elf32_Shdr)));
71 if (shdr->sh_type == SHT_STRTAB)
72 strtab = (unsigned char *)(addr + shdr->sh_offset);
74 /* Load each appropriate section */
75 for (i = 0; i < ehdr->e_shnum; ++i) {
76 shdr = (Elf32_Shdr *)(addr + ehdr->e_shoff +
77 (i * sizeof(Elf32_Shdr)));
79 if (!(shdr->sh_flags & SHF_ALLOC) ||
80 shdr->sh_addr == 0 || shdr->sh_size == 0) {
85 debug("%sing %s @ 0x%08lx (%ld bytes)\n",
86 (shdr->sh_type == SHT_NOBITS) ? "Clear" : "Load",
87 &strtab[shdr->sh_name],
88 (unsigned long)shdr->sh_addr,
92 if (shdr->sh_type == SHT_NOBITS) {
93 memset((void *)(uintptr_t)shdr->sh_addr, 0,
96 image = (unsigned char *)addr + shdr->sh_offset;
97 memcpy((void *)(uintptr_t)shdr->sh_addr,
98 (const void *)image, shdr->sh_size);
100 flush_cache(shdr->sh_addr, shdr->sh_size);
103 return ehdr->e_entry;
106 /* Allow ports to override the default behavior */
107 static unsigned long do_bootelf_exec(ulong (*entry)(int, char * const[]),
108 int argc, char * const argv[])
113 * pass address parameter as argv[0] (aka command name),
114 * and all remaining args
116 ret = entry(argc, argv);
122 * Determine if a valid ELF image exists at the given memory location.
123 * First look at the ELF header magic field, then make sure that it is
126 int valid_elf_image(unsigned long addr)
128 Elf32_Ehdr *ehdr; /* Elf header structure pointer */
130 ehdr = (Elf32_Ehdr *)addr;
132 if (!IS_ELF(*ehdr)) {
133 printf("## No elf image at address 0x%08lx\n", addr);
137 if (ehdr->e_type != ET_EXEC) {
138 printf("## Not a 32-bit elf image at address 0x%08lx\n", addr);
145 /* Interpreter command to boot an arbitrary ELF image from memory */
146 int do_bootelf(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
148 unsigned long addr; /* Address of the ELF image */
149 unsigned long rc; /* Return value from user code */
151 const char *ep = env_get("autostart");
154 /* Consume 'bootelf' */
157 /* Check for flag. */
158 if (argc >= 1 && (argv[0][0] == '-' && \
159 (argv[0][1] == 'p' || argv[0][1] == 's'))) {
164 /* Check for address. */
165 if (argc >= 1 && strict_strtoul(argv[0], 16, &addr) != -EINVAL) {
166 /* Consume address */
171 if (!valid_elf_image(addr))
174 if (sload && sload[1] == 'p')
175 addr = load_elf_image_phdr(addr);
177 addr = load_elf_image_shdr(addr);
179 if (ep && !strcmp(ep, "no"))
182 printf("## Starting application at 0x%08lx ...\n", addr);
185 * pass address parameter as argv[0] (aka command name),
186 * and all remaining args
188 rc = do_bootelf_exec((void *)addr, argc, argv);
192 printf("## Application terminated, rc = 0x%lx\n", rc);
198 * Interpreter command to boot VxWorks from a memory image. The image can
199 * be either an ELF image or a raw binary. Will attempt to setup the
200 * bootline and other parameters correctly.
202 int do_bootvx(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
204 unsigned long addr; /* Address of image */
205 unsigned long bootaddr; /* Address to put the bootline */
206 char *bootline; /* Text of the bootline */
207 char *tmp; /* Temporary char pointer */
208 char build_buf[128]; /* Buffer for building the bootline */
211 struct e820info *info;
212 struct e820entry *data;
216 * Check the loadaddr variable.
217 * If we don't know where the image is then we're done.
222 addr = simple_strtoul(argv[1], NULL, 16);
224 #if defined(CONFIG_CMD_NET)
226 * Check to see if we need to tftp the image ourselves
229 if ((argc == 2) && (strcmp(argv[1], "tftp") == 0)) {
230 if (net_loop(TFTPGET) <= 0)
232 printf("Automatic boot of VxWorks image at address 0x%08lx ...\n",
238 * This should equate to
239 * NV_RAM_ADRS + NV_BOOT_OFFSET + NV_ENET_OFFSET
240 * from the VxWorks BSP header files.
241 * This will vary from board to board
243 #if defined(CONFIG_SYS_VXWORKS_MAC_PTR)
244 tmp = (char *)CONFIG_SYS_VXWORKS_MAC_PTR;
245 eth_env_get_enetaddr("ethaddr", (uchar *)build_buf);
246 memcpy(tmp, build_buf, 6);
248 puts("## Ethernet MAC address not copied to NV RAM\n");
252 * Use bootaddr to find the location in memory that VxWorks
253 * will look for the bootline string. The default value is
254 * (LOCAL_MEM_LOCAL_ADRS + BOOT_LINE_OFFSET) as defined by
255 * VxWorks BSP. For example, on PowerPC it defaults to 0x4200.
257 tmp = env_get("bootaddr");
259 printf("## VxWorks bootline address not specified\n");
261 bootaddr = simple_strtoul(tmp, NULL, 16);
264 * Check to see if the bootline is defined in the 'bootargs'
265 * parameter. If it is not defined, we may be able to
266 * construct the info.
268 bootline = env_get("bootargs");
270 memcpy((void *)bootaddr, bootline,
271 max(strlen(bootline), (size_t)255));
272 flush_cache(bootaddr, max(strlen(bootline),
275 tmp = env_get("bootdev");
277 strcpy(build_buf, tmp);
280 printf("## VxWorks boot device not specified\n");
282 tmp = env_get("bootfile");
284 ptr += sprintf(build_buf + ptr,
287 ptr += sprintf(build_buf + ptr,
291 * The following parameters are only needed if 'bootdev'
292 * is an ethernet device, otherwise they are optional.
294 tmp = env_get("ipaddr");
296 ptr += sprintf(build_buf + ptr, "e=%s", tmp);
297 tmp = env_get("netmask");
299 u32 mask = env_get_ip("netmask").s_addr;
300 ptr += sprintf(build_buf + ptr,
301 ":%08x ", ntohl(mask));
303 ptr += sprintf(build_buf + ptr, " ");
307 tmp = env_get("serverip");
309 ptr += sprintf(build_buf + ptr, "h=%s ", tmp);
311 tmp = env_get("gatewayip");
313 ptr += sprintf(build_buf + ptr, "g=%s ", tmp);
315 tmp = env_get("hostname");
317 ptr += sprintf(build_buf + ptr, "tn=%s ", tmp);
319 tmp = env_get("othbootargs");
321 strcpy(build_buf + ptr, tmp);
325 memcpy((void *)bootaddr, build_buf,
326 max(strlen(build_buf), (size_t)255));
327 flush_cache(bootaddr, max(strlen(build_buf),
331 printf("## Using bootline (@ 0x%lx): %s\n", bootaddr,
337 * Since E820 information is critical to the kernel, if we don't
338 * specify these in the environments, use a default one.
340 tmp = env_get("e820data");
342 data = (struct e820entry *)simple_strtoul(tmp, NULL, 16);
344 data = (struct e820entry *)VXWORKS_E820_DATA_ADDR;
345 tmp = env_get("e820info");
347 info = (struct e820info *)simple_strtoul(tmp, NULL, 16);
349 info = (struct e820info *)VXWORKS_E820_INFO_ADDR;
351 memset(info, 0, sizeof(struct e820info));
352 info->sign = E820_SIGNATURE;
353 info->entries = install_e820_map(E820MAX, data);
354 info->addr = (info->entries - 1) * sizeof(struct e820entry) +
355 VXWORKS_E820_DATA_ADDR;
359 * If the data at the load address is an elf image, then
360 * treat it like an elf image. Otherwise, assume that it is a
363 if (valid_elf_image(addr))
364 addr = load_elf_image_shdr(addr);
366 puts("## Not an ELF image, assuming binary\n");
368 printf("## Starting vxWorks at 0x%08lx ...\n", addr);
372 /* VxWorks on x86 uses stack to pass parameters */
373 ((asmlinkage void (*)(int))addr)(0);
375 ((void (*)(int))addr)(0);
378 puts("## vxWorks terminated\n");
384 bootelf, CONFIG_SYS_MAXARGS, 0, do_bootelf,
385 "Boot from an ELF image in memory",
386 "[-p|-s] [address]\n"
387 "\t- load ELF image at [address] via program headers (-p)\n"
388 "\t or via section headers (-s)"
392 bootvx, 2, 0, do_bootvx,
393 "Boot vxWorks from an ELF image",
394 " [address] - load address of vxWorks ELF image."