mirror of
https://github.com/wiidev/usbloadergx.git
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104 lines
3.5 KiB
C
104 lines
3.5 KiB
C
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/*
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* Copyright (c) 2001 William L. Pitts
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* Modifications (c) 2004 Felix Domke
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are freely
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* permitted provided that the above copyright notice and this
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* paragraph and the following disclaimer are duplicated in all
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* such forms.
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*
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* This software is provided "AS IS" and without any express or
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* implied warranties, including, without limitation, the implied
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* warranties of merchantability and fitness for a particular
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* purpose.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <gccore.h>
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#include "elf_abi.h"
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/* ======================================================================
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* Determine if a valid ELF image exists at the given memory location.
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* First looks at the ELF header magic field, the makes sure that it is
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* executable and makes sure that it is for a PowerPC.
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* ====================================================================== */
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s32 valid_elf_image (void *addr)
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{
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Elf32_Ehdr *ehdr; /* Elf header structure pointer */
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ehdr = (Elf32_Ehdr *) addr;
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if (!IS_ELF (*ehdr))
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return 0;
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if (ehdr->e_type != ET_EXEC)
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return -1;
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if (ehdr->e_machine != EM_PPC)
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return -1;
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return 1;
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}
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/* ======================================================================
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* A very simple elf loader, assumes the image is valid, returns the
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* entry point address.
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* ====================================================================== */
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u32 load_elf_image (void *addr)
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{
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Elf32_Ehdr *ehdr;
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Elf32_Shdr *shdr;
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u8 *strtab = 0;
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u8 *image;
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int i;
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ehdr = (Elf32_Ehdr *) addr;
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/* Find the section header string table for output info */
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shdr = (Elf32_Shdr *) (addr + ehdr->e_shoff +
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(ehdr->e_shstrndx * sizeof (Elf32_Shdr)));
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if (shdr->sh_type == SHT_STRTAB)
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strtab = (u8 *) (addr + shdr->sh_offset);
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/* Load each appropriate section */
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for (i = 0; i < ehdr->e_shnum; ++i) {
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shdr = (Elf32_Shdr *) (addr + ehdr->e_shoff +
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(i * sizeof (Elf32_Shdr)));
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if (!(shdr->sh_flags & SHF_ALLOC)
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|| shdr->sh_addr == 0 || shdr->sh_size == 0) {
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continue;
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}
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shdr->sh_addr &= 0x3FFFFFFF;
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shdr->sh_addr |= 0x80000000;
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if (strtab) {
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/*printf ("%sing section %s @ 0x%08x (0x%08x bytes)\n",
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(shdr->sh_type == SHT_NOBITS) ?
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"clear" : "load",
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&strtab[shdr->sh_name],
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(u32) shdr->sh_addr,
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(u32) shdr->sh_size);*/
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}
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if (shdr->sh_type == SHT_NOBITS) {
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memset ((void *) shdr->sh_addr, 0, shdr->sh_size);
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} else {
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image = (u8 *) addr + shdr->sh_offset;
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memcpy ((void *) shdr->sh_addr,
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(const void *) image,
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shdr->sh_size);
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}
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DCFlushRangeNoSync ((void *) shdr->sh_addr, shdr->sh_size);
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}
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return (ehdr->e_entry & 0x3FFFFFFF) | 0x80000000;
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}
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