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93 lines
2.4 KiB
C
93 lines
2.4 KiB
C
/*
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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 "elf_abi.h"
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#include "sync.h"
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#include "string.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 *elfstart) {
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Elf32_Ehdr *ehdr;
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Elf32_Phdr *phdrs;
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u8 *image;
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int i;
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ehdr = (Elf32_Ehdr *) elfstart;
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if(ehdr->e_phoff == 0 || ehdr->e_phnum == 0)
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return 0;
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if(ehdr->e_phentsize != sizeof(Elf32_Phdr))
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return 0;
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phdrs = (Elf32_Phdr*)(elfstart + ehdr->e_phoff);
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for(i=0;i<ehdr->e_phnum;i++) {
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if(phdrs[i].p_type != PT_LOAD)
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continue;
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phdrs[i].p_paddr &= 0x3FFFFFFF;
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phdrs[i].p_paddr |= 0x80000000;
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if(phdrs[i].p_filesz > phdrs[i].p_memsz)
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return 0;
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if(!phdrs[i].p_filesz)
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continue;
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image = (u8 *) (elfstart + phdrs[i].p_offset);
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memcpy ((void *) phdrs[i].p_paddr, (const void *) image, phdrs[i].p_filesz);
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sync_before_exec ((void *) phdrs[i].p_paddr, phdrs[i].p_memsz);
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//if(phdrs[i].p_flags & PF_X)
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//ICInvalidateRange ((void *) phdrs[i].p_paddr, phdrs[i].p_memsz);
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}
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return ((ehdr->e_entry & 0x3FFFFFFF) | 0x80000000);
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}
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