mirror of
https://gitlab.com/Nanolx/homebrewfilter.git
synced 2024-11-24 18:16:56 +01:00
89 lines
3.0 KiB
C
89 lines
3.0 KiB
C
|
/*
|
||
|
|
* Copyright (c) 2001 William L. Pitts
|
||
|
|
* Modifications (c) 2004 Felix Domke
|
||
|
|
* 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 <stdio.h>
|
||
|
|
#include <string.h>
|
||
|
|
|
||
|
|
#include <gccore.h>
|
||
|
|
|
||
|
|
#include "elf_abi.h"
|
||
|
|
|
||
|
|
|
||
|
|
/* ======================================================================
|
||
|
|
* Determine if a valid ELF image exists at the given memory location.
|
||
|
|
* First looks at the ELF header magic field, the makes sure that it is
|
||
|
|
* executable and makes sure that it is for a PowerPC.
|
||
|
|
* ====================================================================== */
|
||
|
|
s32 valid_elf_image (void *addr) {
|
||
|
|
Elf32_Ehdr *ehdr; /* Elf header structure pointer */
|
||
|
|
ehdr = (Elf32_Ehdr *) addr;
|
||
|
|
if (!IS_ELF (*ehdr))
|
||
|
|
return 0;
|
||
|
|
if (ehdr->e_type != ET_EXEC)
|
||
|
|
return -1;
|
||
|
|
if (ehdr->e_machine != EM_PPC)
|
||
|
|
return -1;
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/* ======================================================================
|
||
|
|
* A very simple elf loader, assumes the image is valid, returns the
|
||
|
|
* entry point address.
|
||
|
|
* ====================================================================== */
|
||
|
|
u32 load_elf_image (void *addr)
|
||
|
|
{
|
||
|
|
Elf32_Ehdr *ehdr;
|
||
|
|
Elf32_Shdr *shdr;
|
||
|
|
u8 *strtab = 0;
|
||
|
|
u8 *image;
|
||
|
|
int i;
|
||
|
|
|
||
|
|
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 = (u8 *) (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;
|
||
|
|
}
|
||
|
|
|
||
|
|
shdr->sh_addr &= 0x3FFFFFFF;
|
||
|
|
shdr->sh_addr |= 0x80000000;
|
||
|
|
|
||
|
|
if (shdr->sh_type == SHT_NOBITS) {
|
||
|
|
memset ((void *) shdr->sh_addr, 0, shdr->sh_size);
|
||
|
|
} else {
|
||
|
|
image = (u8 *) addr + shdr->sh_offset;
|
||
|
|
memcpy ((void *) shdr->sh_addr,
|
||
|
|
(const void *) image,
|
||
|
|
shdr->sh_size);
|
||
|
|
}
|
||
|
|
DCFlushRangeNoSync ((void *) shdr->sh_addr, shdr->sh_size);
|
||
|
|
}
|
||
|
|
return (ehdr->e_entry & 0x3FFFFFFF) | 0x80000000;
|
||
|
|
}
|
||
|
|
|