97 lines
2.0 KiB
C
97 lines
2.0 KiB
C
/**
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* \file elfboot.c
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* License details are found in the file LICENSE.
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* \brief
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* Load an ELF image.
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* \author Taku Shimosawa <shimosawa@is.s.u-tokyo.ac.jp> \par
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* Copyright (C) 2011 - 2012 Taku Shimosawa
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*/
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/*
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* HISTORY
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*/
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#include <elf.h>
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#include "test.h"
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#ifdef TEST
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static void *memcpy(void *dest, void *src, unsigned long len)
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{
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dprintf("Copying %p to %p for %08ld bytes\n", src, dest, len);
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return dest;
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}
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static void *memset(void *dest, int v, unsigned long len)
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{
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dprintf("Filling %p with %02x for %08ld bytes\n", dest, (unsigned char)v, len);
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return dest;
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}
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#else
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static void *memcpy(void *dest, void *src, unsigned long len)
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{
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char *d = dest, *s = src;
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for ( ; len ; len--) {
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*(d++) = *(s++);
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}
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return d;
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}
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static void *memset(void *dest, int v, unsigned long len)
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{
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char *d = dest;
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for ( ; len ; len--) {
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*(d++) = (char)v;
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}
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return d;
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}
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#endif
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static void load_programs(unsigned char *image, Elf64_Phdr *hdrs, int nhdr)
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{
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int i;
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for (i = 0; i < nhdr; i++) {
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if (hdrs[i].p_type == PT_LOAD) {
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dprintf("PT_LOAD : %lx: %lx - %lx (%lx)\n",
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hdrs[i].p_vaddr,
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hdrs[i].p_offset, hdrs[i].p_filesz,
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hdrs[i].p_memsz);
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memcpy((void *)hdrs[i].p_vaddr,
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image + hdrs[i].p_offset,
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hdrs[i].p_filesz);
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if (hdrs[i].p_filesz < hdrs[i].p_memsz) {
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memset((void *)hdrs[i].p_vaddr +
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hdrs[i].p_filesz, 0,
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hdrs[i].p_memsz - hdrs[i].p_filesz);
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}
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}
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}
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}
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/*
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* Return value: If success, the entry point address. Otherwise, 0.
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*/
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unsigned long elfboot_main(unsigned char *image)
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{
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Elf64_Ehdr *hdr;
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hdr = (Elf64_Ehdr *)image;
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if (hdr->e_ident[0] != 0x7f || hdr->e_ident[1] != 'E'
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|| hdr->e_ident[2] != 'L' || hdr->e_ident[3] != 'F') {
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return 0;
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}
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/* TODO: We may overlap. So copying should be more sophisticated */
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if (!hdr->e_phoff || hdr->e_phentsize != sizeof(Elf64_Phdr)) {
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return 0;
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}
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load_programs(image,
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(Elf64_Phdr *)(image + hdr->e_phoff), hdr->e_phnum);
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return hdr->e_entry;
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}
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