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a610998ea4
This is a small & simple ELF loader which just copies program segments from disk to memory. It only supports static binaries right now. Change-Id: I8944feb5b9dafcc5c56e12383aed25e2718ad7ea
143 lines
3.6 KiB
C
143 lines
3.6 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2026 Aidan MacDonald
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#ifndef __ELF_H__
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#define __ELF_H__
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#include <stdint.h>
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/* Field offsets in the e_ident array */
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#define EI_MAG0 0
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#define EI_MAG1 1
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#define EI_MAG2 2
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#define EI_MAG3 3
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#define EI_CLASS 4
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#define EI_DATA 5
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#define EI_VERSION 6
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#define EI_OSABI 7
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#define EI_ABIVERSION 8
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#define EI_PAD 9
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#define EI_NIDENT 16
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/* Values for ei_magic */
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#define ELFMAG0 0x7f
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#define ELFMAG1 'E'
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#define ELFMAG2 'L'
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#define ELFMAG3 'F'
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/* Values for ei_class */
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#define ELFCLASSNONE 0
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#define ELFCLASS32 1
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#define ELFCLASS64 2
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/* Values for ei_data */
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#define ELFDATANONE 0
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#define ELFDATA2LSB 1
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#define ELFDATA2MSB 2
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/* Values for ei_version and e_version */
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#define EV_NONE 0
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#define EV_CURRENT 1
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/* Values for ei_osabi */
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#define ELFOSABI_NONE ELFOSABI_SYSV
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#define ELFOSABI_SYSV 0
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/* Values for e_type */
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#define ET_NONE 0
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#define ET_REL 1
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#define ET_EXEC 2
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#define ET_DYN 3
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#define ET_CORE 4
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/* Values for e_machine */
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#define EM_NONE 0
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#define EM_68K 4
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#define EM_MIPS 8
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#define EM_ARM 40
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/*
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* Special value for e_phnum when the real number of
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* program headers is too large.
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*/
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#define PN_XNUM 0xFFFFu
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/* ELF basic types */
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typedef uint32_t elf_addr_t;
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typedef uint32_t elf_off_t;
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/* ELF file header */
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struct elf_header
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{
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union {
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uint8_t e_ident[EI_NIDENT];
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struct {
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uint8_t ei_magic[4];
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uint8_t ei_class;
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uint8_t ei_data;
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uint8_t ei_version;
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uint8_t ei_osabi;
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uint8_t ei_abiversion;
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};
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};
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uint16_t e_type;
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uint16_t e_machine;
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uint32_t e_version;
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elf_addr_t e_entry;
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elf_off_t e_phoff;
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elf_off_t e_shoff;
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uint32_t e_flags;
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uint16_t e_ehsize;
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uint16_t e_phentsize;
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uint16_t e_phnum;
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uint16_t e_shentsize;
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uint16_t e_shnum;
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uint16_t e_shstrndx;
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};
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/* Values for p_type */
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#define PT_NULL 0
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#define PT_LOAD 1
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#define PT_DYNAMIC 2
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#define PT_INTERP 3
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#define PT_NOTE 4
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#define PT_SHLIB 5
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#define PT_PHDR 6
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/* Values for p_flags */
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#define PF_X (1 << 0) /* Segment is executable */
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#define PF_W (1 << 1) /* Segment is writable */
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#define PF_R (1 << 2) /* Segment is readable */
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/* ELF 32-bit program header */
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struct elf32_phdr
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{
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uint32_t p_type;
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elf_off_t p_offset;
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elf_addr_t p_vaddr;
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elf_addr_t p_paddr;
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uint32_t p_filesz;
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uint32_t p_memsz;
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uint32_t p_flags;
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uint32_t p_align;
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};
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#endif /* __ELF_H__ */
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