[thirdparty/u-boot.git] / common / cmd_elf.c

/*
 * Copyright (c) 2001 William L. Pitts
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are freely
 * permitted provided that the above copyright notice and this
 * paragraph and the following disclaimer are duplicated in all
 * such forms.
 *
 * This software is provided "AS IS" and without any express or
 * implied warranties, including, without limitation, the implied
 * warranties of merchantability and fitness for a particular
 * purpose.
 */

#include <common.h>
#include <command.h>
#include <elf.h>
#include <net.h>
#include <vxworks.h>

static unsigned long load_elf_image_phdr(unsigned long addr);
static unsigned long load_elf_image_shdr(unsigned long addr);

/* Allow ports to override the default behavior */
static unsigned long do_bootelf_exec(ulong (*entry)(int, char * const[]),
				     int argc, char * const argv[])
{
	unsigned long ret;

	/*
	 * QNX images require the data cache is disabled.
	 * Data cache is already flushed, so just turn it off.
	 */
	int dcache = dcache_status();
	if (dcache)
		dcache_disable();

	/*
	 * pass address parameter as argv[0] (aka command name),
	 * and all remaining args
	 */
	ret = entry(argc, argv);

	if (dcache)
		dcache_enable();

	return ret;
}

/*
 * Determine if a valid ELF image exists at the given memory location.
 * First look at the ELF header magic field, then make sure that it is
 * executable.
 */
int valid_elf_image(unsigned long addr)
{
	Elf32_Ehdr *ehdr; /* Elf header structure pointer */

	ehdr = (Elf32_Ehdr *)addr;

	if (!IS_ELF(*ehdr)) {
		printf("## No elf image at address 0x%08lx\n", addr);
		return 0;
	}

	if (ehdr->e_type != ET_EXEC) {
		printf("## Not a 32-bit elf image at address 0x%08lx\n", addr);
		return 0;
	}

	return 1;
}

/* Interpreter command to boot an arbitrary ELF image from memory */
int do_bootelf(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
	unsigned long addr; /* Address of the ELF image */
	unsigned long rc; /* Return value from user code */
	char *sload, *saddr;
	const char *ep = getenv("autostart");

	int rcode = 0;

	sload = saddr = NULL;
	if (argc == 3) {
		sload = argv[1];
		saddr = argv[2];
	} else if (argc == 2) {
		if (argv[1][0] == '-')
			sload = argv[1];
		else
			saddr = argv[1];
	}

	if (saddr)
		addr = simple_strtoul(saddr, NULL, 16);
	else
		addr = load_addr;

	if (!valid_elf_image(addr))
		return 1;

	if (sload && sload[1] == 'p')
		addr = load_elf_image_phdr(addr);
	else
		addr = load_elf_image_shdr(addr);

	if (ep && !strcmp(ep, "no"))
		return rcode;

	printf("## Starting application at 0x%08lx ...\n", addr);

	/*
	 * pass address parameter as argv[0] (aka command name),
	 * and all remaining args
	 */
	rc = do_bootelf_exec((void *)addr, argc - 1, argv + 1);
	if (rc != 0)
		rcode = 1;

	printf("## Application terminated, rc = 0x%lx\n", rc);

	return rcode;
}

/*
 * Interpreter command to boot VxWorks from a memory image.  The image can
 * be either an ELF image or a raw binary.  Will attempt to setup the
 * bootline and other parameters correctly.
 */
int do_bootvx(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
	unsigned long addr; /* Address of image */
	unsigned long bootaddr; /* Address to put the bootline */
	char *bootline; /* Text of the bootline */
	char *tmp; /* Temporary char pointer */
	char build_buf[128]; /* Buffer for building the bootline */

	/*
	 * Check the loadaddr variable.
	 * If we don't know where the image is then we're done.
	 */
	if (argc < 2)
		addr = load_addr;
	else
		addr = simple_strtoul(argv[1], NULL, 16);

#if defined(CONFIG_CMD_NET)
	/*
	 * Check to see if we need to tftp the image ourselves
	 * before starting
	 */
	if ((argc == 2) && (strcmp(argv[1], "tftp") == 0)) {
		if (net_loop(TFTPGET) <= 0)
			return 1;
		printf("Automatic boot of VxWorks image at address 0x%08lx ...\n",
			addr);
	}
#endif

	/*
	 * This should equate to
	 * NV_RAM_ADRS + NV_BOOT_OFFSET + NV_ENET_OFFSET
	 * from the VxWorks BSP header files.
	 * This will vary from board to board
	 */
#if defined(CONFIG_WALNUT)
	tmp = (char *)CONFIG_SYS_NVRAM_BASE_ADDR + 0x500;
	eth_getenv_enetaddr("ethaddr", (uchar *)build_buf);
	memcpy(tmp, &build_buf[3], 3);
#elif defined(CONFIG_SYS_VXWORKS_MAC_PTR)
	tmp = (char *)CONFIG_SYS_VXWORKS_MAC_PTR;
	eth_getenv_enetaddr("ethaddr", (uchar *)build_buf);
	memcpy(tmp, build_buf, 6);
#else
	puts("## Ethernet MAC address not copied to NV RAM\n");
#endif

	/*
	 * Use bootaddr to find the location in memory that VxWorks
	 * will look for the bootline string. The default value for
	 * PowerPC is LOCAL_MEM_LOCAL_ADRS + BOOT_LINE_OFFSET which
	 * defaults to 0x4200.
	 */
	tmp = getenv("bootaddr");
	if (!tmp)
		bootaddr = CONFIG_SYS_VXWORKS_BOOT_ADDR;
	else
		bootaddr = simple_strtoul(tmp, NULL, 16);

	/*
	 * Check to see if the bootline is defined in the 'bootargs'
	 * parameter. If it is not defined, we may be able to
	 * construct the info.
	 */
	bootline = getenv("bootargs");
	if (bootline) {
		memcpy((void *)bootaddr, bootline,
		       max(strlen(bootline), (size_t)255));
		flush_cache(bootaddr, max(strlen(bootline), (size_t)255));
	} else {
		sprintf(build_buf, CONFIG_SYS_VXWORKS_BOOT_DEVICE);
		tmp = getenv("bootfile");
		if (tmp)
			sprintf(&build_buf[strlen(build_buf)],
				"%s:%s ", CONFIG_SYS_VXWORKS_SERVERNAME, tmp);
		else
			sprintf(&build_buf[strlen(build_buf)],
				"%s:file ", CONFIG_SYS_VXWORKS_SERVERNAME);

		tmp = getenv("ipaddr");
		if (tmp)
			sprintf(&build_buf[strlen(build_buf)], "e=%s ", tmp);

		tmp = getenv("serverip");
		if (tmp)
			sprintf(&build_buf[strlen(build_buf)], "h=%s ", tmp);

		tmp = getenv("hostname");
		if (tmp)
			sprintf(&build_buf[strlen(build_buf)], "tn=%s ", tmp);

#ifdef CONFIG_SYS_VXWORKS_ADD_PARAMS
		sprintf(&build_buf[strlen(build_buf)],
			CONFIG_SYS_VXWORKS_ADD_PARAMS);
#endif

		memcpy((void *)bootaddr, build_buf,
		       max(strlen(build_buf), (size_t)255));
		flush_cache(bootaddr, max(strlen(build_buf), (size_t)255));
	}

	/*
	 * If the data at the load address is an elf image, then
	 * treat it like an elf image. Otherwise, assume that it is a
	 * binary image.
	 */
	if (valid_elf_image(addr))
		addr = load_elf_image_shdr(addr);
	else
		puts("## Not an ELF image, assuming binary\n");

	printf("## Using bootline (@ 0x%lx): %s\n", bootaddr,
	       (char *)bootaddr);
	printf("## Starting vxWorks at 0x%08lx ...\n", addr);

	dcache_disable();
	((void (*)(int))addr)(0);

	puts("## vxWorks terminated\n");

	return 1;
}

/*
 * A very simple elf loader, assumes the image is valid, returns the
 * entry point address.
 */
static unsigned long load_elf_image_phdr(unsigned long addr)
{
	Elf32_Ehdr *ehdr; /* Elf header structure pointer */
	Elf32_Phdr *phdr; /* Program header structure pointer */
	int i;

	ehdr = (Elf32_Ehdr *)addr;
	phdr = (Elf32_Phdr *)(addr + ehdr->e_phoff);

	/* Load each program header */
	for (i = 0; i < ehdr->e_phnum; ++i) {
		void *dst = (void *)(uintptr_t)phdr->p_paddr;
		void *src = (void *)addr + phdr->p_offset;
		debug("Loading phdr %i to 0x%p (%i bytes)\n",
		      i, dst, phdr->p_filesz);
		if (phdr->p_filesz)
			memcpy(dst, src, phdr->p_filesz);
		if (phdr->p_filesz != phdr->p_memsz)
			memset(dst + phdr->p_filesz, 0x00,
			       phdr->p_memsz - phdr->p_filesz);
		flush_cache((unsigned long)dst, phdr->p_filesz);
		++phdr;
	}

	return ehdr->e_entry;
}

static unsigned long load_elf_image_shdr(unsigned long addr)
{
	Elf32_Ehdr *ehdr; /* Elf header structure pointer */
	Elf32_Shdr *shdr; /* Section header structure pointer */
	unsigned char *strtab = 0; /* String table pointer */
	unsigned char *image; /* Binary image pointer */
	int i; /* Loop counter */

	ehdr = (Elf32_Ehdr *)addr;

	/* Find the section header string table for output info */
	shdr = (Elf32_Shdr *)(addr + ehdr->e_shoff +
			     (ehdr->e_shstrndx * sizeof(Elf32_Shdr)));

	if (shdr->sh_type == SHT_STRTAB)
		strtab = (unsigned char *)(addr + shdr->sh_offset);

	/* Load each appropriate section */
	for (i = 0; i < ehdr->e_shnum; ++i) {
		shdr = (Elf32_Shdr *)(addr + ehdr->e_shoff +
				     (i * sizeof(Elf32_Shdr)));

		if (!(shdr->sh_flags & SHF_ALLOC) ||
		    shdr->sh_addr == 0 || shdr->sh_size == 0) {
			continue;
		}

		if (strtab) {
			debug("%sing %s @ 0x%08lx (%ld bytes)\n",
			      (shdr->sh_type == SHT_NOBITS) ? "Clear" : "Load",
			       &strtab[shdr->sh_name],
			       (unsigned long)shdr->sh_addr,
			       (long)shdr->sh_size);
		}

		if (shdr->sh_type == SHT_NOBITS) {
			memset((void *)(uintptr_t)shdr->sh_addr, 0,
			       shdr->sh_size);
		} else {
			image = (unsigned char *)addr + shdr->sh_offset;
			memcpy((void *)(uintptr_t)shdr->sh_addr,
			       (const void *)image, shdr->sh_size);
		}
		flush_cache(shdr->sh_addr, shdr->sh_size);
	}

	return ehdr->e_entry;
}

U_BOOT_CMD(
	bootelf, 3, 0, do_bootelf,
	"Boot from an ELF image in memory",
	"[-p|-s] [address]\n"
	"\t- load ELF image at [address] via program headers (-p)\n"
	"\t  or via section headers (-s)"
);

U_BOOT_CMD(
	bootvx, 2, 0, do_bootvx,
	"Boot vxWorks from an ELF image",
	" [address] - load address of vxWorks ELF image."
);
Commit	Line	Data
458ded34 WD	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>
458ded34	18	#include <elf.h>
ebca3df7	19	#include <net.h>
29a4c24d	20	#include <vxworks.h>
458ded34	21
f44a928e MF	22	static unsigned long load_elf_image_phdr(unsigned long addr);
f44a928e MF	23	static unsigned long load_elf_image_shdr(unsigned long addr);
017e9b79 MF	24
017e9b79 MF	25	/* Allow ports to override the default behavior */
553d8c3a	26	static unsigned long do_bootelf_exec(ulong (entry)(int, char const[]),
ebca3df7	27	int argc, char * const argv[])
1f1d88dd	28	{
017e9b79 MF	29	unsigned long ret;
017e9b79 MF	30
1f1d88dd MF	31	/*
	32	* QNX images require the data cache is disabled.
	33	* Data cache is already flushed, so just turn it off.
	34	*/
62e03d33	35	int dcache = dcache_status();
017e9b79	36	if (dcache)
62e03d33	37	dcache_disable();
1f1d88dd	38
017e9b79 MF	39	/*
	40	* pass address parameter as argv[0] (aka command name),
	41	* and all remaining args
	42	*/
62e03d33	43	ret = entry(argc, argv);
1f1d88dd	44
017e9b79	45	if (dcache)
62e03d33	46	dcache_enable();
017e9b79 MF	47
	48	return ret;
	49	}
458ded34	50
ebca3df7	51	/*
62e03d33	52	* Determine if a valid ELF image exists at the given memory location.
ebca3df7 BM	53	* First look at the ELF header magic field, then make sure that it is
	54	* executable.
	55	*/
62e03d33 DS	56	int valid_elf_image(unsigned long addr)
62e03d33 DS	57	{
ebca3df7	58	Elf32_Ehdr ehdr; / Elf header structure pointer */
62e03d33	59
ebca3df7	60	ehdr = (Elf32_Ehdr *)addr;
62e03d33 DS	61
	62	if (!IS_ELF(*ehdr)) {
	63	printf("## No elf image at address 0x%08lx\n", addr);
	64	return 0;
	65	}
	66
	67	if (ehdr->e_type != ET_EXEC) {
	68	printf("## Not a 32-bit elf image at address 0x%08lx\n", addr);
	69	return 0;
	70	}
	71
62e03d33 DS	72	return 1;
	73	}
	74
ebca3df7	75	/* Interpreter command to boot an arbitrary ELF image from memory */
62e03d33	76	int do_bootelf(cmd_tbl_t cmdtp, int flag, int argc, char const argv[])
458ded34	77	{
ebca3df7 BM	78	unsigned long addr; /* Address of the ELF image */
ebca3df7 BM	79	unsigned long rc; /* Return value from user code */
f44a928e	80	char sload, saddr;
44c8fd3a	81	const char *ep = getenv("autostart");
458ded34	82
458ded34 WD	83	int rcode = 0;
458ded34 WD	84
f44a928e MF	85	sload = saddr = NULL;
	86	if (argc == 3) {
	87	sload = argv[1];
	88	saddr = argv[2];
	89	} else if (argc == 2) {
	90	if (argv[1][0] == '-')
	91	sload = argv[1];
	92	else
	93	saddr = argv[1];
	94	}
	95
	96	if (saddr)
	97	addr = simple_strtoul(saddr, NULL, 16);
458ded34	98	else
f44a928e	99	addr = load_addr;
458ded34	100
62e03d33	101	if (!valid_elf_image(addr))
458ded34 WD	102	return 1;
458ded34 WD	103
f44a928e MF	104	if (sload && sload[1] == 'p')
	105	addr = load_elf_image_phdr(addr);
	106	else
	107	addr = load_elf_image_shdr(addr);
458ded34	108
44c8fd3a SDPP	109	if (ep && !strcmp(ep, "no"))
	110	return rcode;
	111
62e03d33	112	printf("## Starting application at 0x%08lx ...\n", addr);
458ded34	113
458ded34 WD	114	/*
	115	* pass address parameter as argv[0] (aka command name),
	116	* and all remaining args
	117	*/
62e03d33	118	rc = do_bootelf_exec((void *)addr, argc - 1, argv + 1);
458ded34 WD	119	if (rc != 0)
	120	rcode = 1;
	121
62e03d33	122	printf("## Application terminated, rc = 0x%lx\n", rc);
ebca3df7	123
458ded34 WD	124	return rcode;
	125	}
	126
ebca3df7	127	/*
458ded34 WD	128	* Interpreter command to boot VxWorks from a memory image. The image can
	129	* be either an ELF image or a raw binary. Will attempt to setup the
	130	* bootline and other parameters correctly.
ebca3df7	131	*/
62e03d33	132	int do_bootvx(cmd_tbl_t cmdtp, int flag, int argc, char const argv[])
458ded34	133	{
ebca3df7 BM	134	unsigned long addr; /* Address of image */
	135	unsigned long bootaddr; /* Address to put the bootline */
	136	char bootline; / Text of the bootline */
	137	char tmp; / Temporary char pointer */
	138	char build_buf[128]; /* Buffer for building the bootline */
	139
	140	/*
458ded34 WD	141	* Check the loadaddr variable.
	142	* If we don't know where the image is then we're done.
	143	*/
07a1a0c9	144	if (argc < 2)
1bdd4683 SR	145	addr = load_addr;
1bdd4683 SR	146	else
07a1a0c9	147	addr = simple_strtoul(argv[1], NULL, 16);
458ded34	148
baa26db4	149	#if defined(CONFIG_CMD_NET)
62e03d33	150	/*
ebca3df7 BM	151	* Check to see if we need to tftp the image ourselves
ebca3df7 BM	152	* before starting
62e03d33	153	*/
07a1a0c9	154	if ((argc == 2) && (strcmp(argv[1], "tftp") == 0)) {
bc0571fc	155	if (net_loop(TFTPGET) <= 0)
458ded34	156	return 1;
62e03d33 DS	157	printf("Automatic boot of VxWorks image at address 0x%08lx ...\n",
62e03d33 DS	158	addr);
458ded34 WD	159	}
	160	#endif
	161
ebca3df7 BM	162	/*
	163	* This should equate to
	164	* NV_RAM_ADRS + NV_BOOT_OFFSET + NV_ENET_OFFSET
458ded34 WD	165	* from the VxWorks BSP header files.
	166	* This will vary from board to board
	167	*/
c157d8e2	168	#if defined(CONFIG_WALNUT)
ebca3df7	169	tmp = (char *)CONFIG_SYS_NVRAM_BASE_ADDR + 0x500;
76756e41	170	eth_getenv_enetaddr("ethaddr", (uchar *)build_buf);
62c93d92	171	memcpy(tmp, &build_buf[3], 3);
6d0f6bcf	172	#elif defined(CONFIG_SYS_VXWORKS_MAC_PTR)
ebca3df7	173	tmp = (char *)CONFIG_SYS_VXWORKS_MAC_PTR;
76756e41	174	eth_getenv_enetaddr("ethaddr", (uchar *)build_buf);
62c93d92	175	memcpy(tmp, build_buf, 6);
458ded34	176	#else
62e03d33	177	puts("## Ethernet MAC address not copied to NV RAM\n");
458ded34 WD	178	#endif
458ded34 WD	179
8bde7f77 WD	180	/*
	181	* Use bootaddr to find the location in memory that VxWorks
	182	* will look for the bootline string. The default value for
	183	* PowerPC is LOCAL_MEM_LOCAL_ADRS + BOOT_LINE_OFFSET which
ebca3df7	184	* defaults to 0x4200.
458ded34	185	*/
62e03d33	186	tmp = getenv("bootaddr");
1b3e0b19	187	if (!tmp)
29a4c24d	188	bootaddr = CONFIG_SYS_VXWORKS_BOOT_ADDR;
458ded34	189	else
62e03d33	190	bootaddr = simple_strtoul(tmp, NULL, 16);
458ded34	191
8bde7f77 WD	192	/*
	193	* Check to see if the bootline is defined in the 'bootargs'
	194	* parameter. If it is not defined, we may be able to
ebca3df7	195	* construct the info.
458ded34	196	*/
62e03d33 DS	197	bootline = getenv("bootargs");
62e03d33 DS	198	if (bootline) {
b4141195 MY	199	memcpy((void *)bootaddr, bootline,
	200	max(strlen(bootline), (size_t)255));
	201	flush_cache(bootaddr, max(strlen(bootline), (size_t)255));
458ded34	202	} else {
62e03d33 DS	203	sprintf(build_buf, CONFIG_SYS_VXWORKS_BOOT_DEVICE);
	204	tmp = getenv("bootfile");
	205	if (tmp)
	206	sprintf(&build_buf[strlen(build_buf)],
ebca3df7	207	"%s:%s ", CONFIG_SYS_VXWORKS_SERVERNAME, tmp);
62e03d33 DS	208	else
62e03d33 DS	209	sprintf(&build_buf[strlen(build_buf)],
ebca3df7	210	"%s:file ", CONFIG_SYS_VXWORKS_SERVERNAME);
458ded34	211
62e03d33 DS	212	tmp = getenv("ipaddr");
	213	if (tmp)
	214	sprintf(&build_buf[strlen(build_buf)], "e=%s ", tmp);
458ded34	215
62e03d33 DS	216	tmp = getenv("serverip");
	217	if (tmp)
	218	sprintf(&build_buf[strlen(build_buf)], "h=%s ", tmp);
	219
	220	tmp = getenv("hostname");
	221	if (tmp)
	222	sprintf(&build_buf[strlen(build_buf)], "tn=%s ", tmp);
458ded34	223
29a4c24d	224	#ifdef CONFIG_SYS_VXWORKS_ADD_PARAMS
62e03d33	225	sprintf(&build_buf[strlen(build_buf)],
ebca3df7	226	CONFIG_SYS_VXWORKS_ADD_PARAMS);
458ded34	227	#endif
29a4c24d	228
b4141195 MY	229	memcpy((void *)bootaddr, build_buf,
	230	max(strlen(build_buf), (size_t)255));
	231	flush_cache(bootaddr, max(strlen(build_buf), (size_t)255));
458ded34 WD	232	}
458ded34 WD	233
8bde7f77 WD	234	/*
	235	* If the data at the load address is an elf image, then
	236	* treat it like an elf image. Otherwise, assume that it is a
ebca3df7	237	* binary image.
458ded34	238	*/
ebca3df7	239	if (valid_elf_image(addr))
62e03d33	240	addr = load_elf_image_shdr(addr);
ebca3df7	241	else
62e03d33	242	puts("## Not an ELF image, assuming binary\n");
458ded34	243
62e03d33	244	printf("## Using bootline (@ 0x%lx): %s\n", bootaddr,
ebca3df7	245	(char *)bootaddr);
62e03d33	246	printf("## Starting vxWorks at 0x%08lx ...\n", addr);
458ded34	247
6eee21da	248	dcache_disable();
ebca3df7	249	((void (*)(int))addr)(0);
458ded34	250
62e03d33	251	puts("## vxWorks terminated\n");
ebca3df7	252
458ded34 WD	253	return 1;
	254	}
	255
ebca3df7	256	/*
458ded34 WD	257	* A very simple elf loader, assumes the image is valid, returns the
458ded34 WD	258	* entry point address.
ebca3df7	259	*/
f44a928e MF	260	static unsigned long load_elf_image_phdr(unsigned long addr)
f44a928e MF	261	{
ebca3df7 BM	262	Elf32_Ehdr ehdr; / Elf header structure pointer */
ebca3df7 BM	263	Elf32_Phdr phdr; / Program header structure pointer */
f44a928e MF	264	int i;
f44a928e MF	265
ebca3df7 BM	266	ehdr = (Elf32_Ehdr *)addr;
ebca3df7 BM	267	phdr = (Elf32_Phdr *)(addr + ehdr->e_phoff);
f44a928e MF	268
	269	/* Load each program header */
	270	for (i = 0; i < ehdr->e_phnum; ++i) {
ebca3df7 BM	271	void dst = (void )(uintptr_t)phdr->p_paddr;
ebca3df7 BM	272	void src = (void )addr + phdr->p_offset;
f44a928e	273	debug("Loading phdr %i to 0x%p (%i bytes)\n",
ebca3df7	274	i, dst, phdr->p_filesz);
f44a928e MF	275	if (phdr->p_filesz)
	276	memcpy(dst, src, phdr->p_filesz);
	277	if (phdr->p_filesz != phdr->p_memsz)
62e03d33	278	memset(dst + phdr->p_filesz, 0x00,
ebca3df7	279	phdr->p_memsz - phdr->p_filesz);
f44a928e MF	280	flush_cache((unsigned long)dst, phdr->p_filesz);
	281	++phdr;
	282	}
	283
	284	return ehdr->e_entry;
	285	}
	286
	287	static unsigned long load_elf_image_shdr(unsigned long addr)
458ded34	288	{
ebca3df7 BM	289	Elf32_Ehdr ehdr; / Elf header structure pointer */
	290	Elf32_Shdr shdr; / Section header structure pointer */
	291	unsigned char strtab = 0; / String table pointer */
	292	unsigned char image; / Binary image pointer */
	293	int i; /* Loop counter */
458ded34	294
ebca3df7	295	ehdr = (Elf32_Ehdr *)addr;
458ded34 WD	296
458ded34 WD	297	/* Find the section header string table for output info */
ebca3df7 BM	298	shdr = (Elf32_Shdr *)(addr + ehdr->e_shoff +
ebca3df7 BM	299	(ehdr->e_shstrndx * sizeof(Elf32_Shdr)));
458ded34 WD	300
458ded34 WD	301	if (shdr->sh_type == SHT_STRTAB)
ebca3df7	302	strtab = (unsigned char *)(addr + shdr->sh_offset);
458ded34 WD	303
	304	/* Load each appropriate section */
	305	for (i = 0; i < ehdr->e_shnum; ++i) {
ebca3df7 BM	306	shdr = (Elf32_Shdr *)(addr + ehdr->e_shoff +
ebca3df7 BM	307	(i * sizeof(Elf32_Shdr)));
458ded34	308
ebca3df7 BM	309	if (!(shdr->sh_flags & SHF_ALLOC) \|\|
ebca3df7 BM	310	shdr->sh_addr == 0 \|\| shdr->sh_size == 0) {
458ded34 WD	311	continue;
	312	}
	313
	314	if (strtab) {
3c972849	315	debug("%sing %s @ 0x%08lx (%ld bytes)\n",
ebca3df7 BM	316	(shdr->sh_type == SHT_NOBITS) ? "Clear" : "Load",
	317	&strtab[shdr->sh_name],
	318	(unsigned long)shdr->sh_addr,
	319	(long)shdr->sh_size);
458ded34 WD	320	}
	321
	322	if (shdr->sh_type == SHT_NOBITS) {
ebca3df7 BM	323	memset((void *)(uintptr_t)shdr->sh_addr, 0,
ebca3df7 BM	324	shdr->sh_size);
458ded34	325	} else {
ebca3df7 BM	326	image = (unsigned char *)addr + shdr->sh_offset;
	327	memcpy((void *)(uintptr_t)shdr->sh_addr,
	328	(const void *)image, shdr->sh_size);
458ded34	329	}
62e03d33	330	flush_cache(shdr->sh_addr, shdr->sh_size);
458ded34 WD	331	}
	332
	333	return ehdr->e_entry;
	334	}
	335
0d498393	336	U_BOOT_CMD(
ebca3df7	337	bootelf, 3, 0, do_bootelf,
2fb2604d	338	"Boot from an ELF image in memory",
f44a928e MF	339	"[-p\|-s] [address]\n"
	340	"\t- load ELF image at [address] via program headers (-p)\n"
	341	"\t or via section headers (-s)"
8bde7f77 WD	342	);
8bde7f77 WD	343
0d498393	344	U_BOOT_CMD(
ebca3df7	345	bootvx, 2, 0, do_bootvx,
2fb2604d	346	"Boot vxWorks from an ELF image",
a89c33db	347	" [address] - load address of vxWorks ELF image."
8bde7f77	348	);