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48 lines
1.1 KiB
C
48 lines
1.1 KiB
C
// Copyright 2008-2009 Segher Boessenkool <segher@kernel.crashing.org>
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// This code is licensed to you under the terms of the GNU GPL, version 2;
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// see file COPYING or http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt
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#include "loader.h"
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// Determine if a valid ELF image exists at the given memory location.
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int valid_elf_image(void *addr)
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{
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u32 *header = addr;
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return header[0] == 0x7f454c46 // ELF
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&& header[1] == 0x01020100 // 32-bit, BE, ELF v1, SVR
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&& header[4] == 0x00020014 // executable, PowerPC
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&& header[5] == 1 // object file v1
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&& (header[10] & 0xffff) == 32; // PHDR size
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}
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// Returns the entry point address.
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void *load_elf_image(void *addr)
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{
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u32 *header = addr;
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u32 *phdr = addr + header[7];
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u32 n = header[11] >> 16;
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u32 i;
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for (i = 0; i < n; i++, phdr += 8) {
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if (phdr[0] != 1) // PT_LOAD
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continue;
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u32 off = phdr[1];
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void *dest = (void *)phdr[3];
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u32 filesz = phdr[4];
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u32 memsz = phdr[5];
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memcpy(dest, addr + off, filesz);
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memset(dest + filesz, 0, memsz - filesz);
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sync_before_exec(dest, memsz);
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}
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return (void *)header[6];
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}
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