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>
#ifdef CONFIG_X86
#include <asm/e820.h>
#include <linux/linkage.h>
#endif

/*
 * 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)));