elf.h

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/*
 * Copyright (c) 2014, Michael Müller
 * Copyright (c) 2014, Sebastian Lackner
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

#ifndef _H_ELF_
#define _H_ELF_

#include <stdint.h>
#include <stdbool.h>

#define ELF_IDENT_MAG0          0
#define ELF_IDENT_MAG1          1
#define ELF_IDENT_MAG2          2
#define ELF_IDENT_MAG3          3
#define ELF_IDENT_CLASS         4
#define ELF_IDENT_DATA          5
#define ELF_IDENT_VERSION       6
#define ELF_IDENT_OSABI         7
#define ELF_IDENT_ABIVERSION    8
#define ELF_IDENT_PAD           9
#define ELF_NIDENT              16

#define ELF_MAG0     0x7f
#define ELF_MAG1     'E'
#define ELF_MAG2     'L'
#define ELF_MAG3     'F'

#define ELF_CLASS_NONE  0
#define ELF_CLASS_32    1
#define ELF_CLASS_64    2

/* see http://www.sco.com/developers/gabi/2000-07-17/ch4.eheader.html for the other 81 types*/
#define ELF_MACHINE_386 3

#define ELF_DATA_NONE   0
#define ELF_DATA_2LSB   1
#define ELF_DATA_2MSB   2

#define ELF_TYPE_NONE   0
#define ELF_TYPE_REL    1
#define ELF_TYPE_EXEC   2
#define ELF_TYPE_DYN    3
#define ELF_TYPE_CORE   4
#define ELF_TYPE_LOOS   0xfe00
#define ELF_TYPE_HIOS   0xfeff
#define ELF_TYPE_LOPROC 0xff00
#define ELF_TYPE_HIPROC 0xffff

#define ELF_SHN_UNDELF      0
#define ELF_SHN_LORESERVE   0xff00
#define ELF_SHN_LOPROC      0xff00
#define ELF_SHN_HIPROC      0xff1f
#define ELF_SHN_LOOS        0xff20
#define ELF_SHN_HIOS        0xff3f
#define ELF_SHN_ABS         0xfff1
#define ELF_SHN_COMMON      0xfff2
#define ELF_SHN_XINDEX      0xffff
#define ELF_SHN_HIRESERVE   0xffff

#define ELF_STYPE_NULL          0
#define ELF_STYPE_PROGBITS      1
#define ELF_STYPE_SYMTAB        2
#define ELF_STYPE_STRTAB        3
#define ELF_STYPE_RELA          4
#define ELF_STYPE_HASH          5
#define ELF_STYPE_DYNAMIC       6
#define ELF_STYPE_NOTE          7
#define ELF_STYPE_NOBITS        8
#define ELF_STYPE_REL           9
#define ELF_STYPE_SHLIB         10
#define ELF_STYPE_DYNSYM        11
#define ELF_STYPE_INIT_ARRAY    14
#define ELF_STYPE_FINI_ARRAY    15
#define ELF_STYPE_PREINIT_ARRAY 16
#define ELF_STYPE_GROUP         17
#define ELF_STYPE_SYMTAB_SHNDX  18
#define ELF_STYPE_LOOS          0x60000000
#define ELF_STYPE_HIOS          0x6fffffff
#define ELF_STYPE_LOPROC        0x70000000
#define ELF_STYPE_HIPROC        0x7fffffff
#define ELF_STYPE_LOUSER        0x80000000
#define ELF_STYPE_HIUSER        0xffffffff

#define ELF_SFLAGS_WRITE            0x1
#define ELF_SFLAGS_ALLOC            0x2
#define ELF_SFLAGS_EXECINSTR        0x4
#define ELF_SFLAGS_MERGE            0x10
#define ELF_SFLAGS_STRINGS          0x20
#define ELF_SFLAGS_INFO_LINK        0x40
#define ELF_SFLAGS_LINK_ORDER       0x80
#define ELF_SFLAGS_OS_NONCONFORMING 0x100
#define ELF_SFLAGS_GROUP            0x200
#define ELF_SFLAGS_MASKOS           0x0ff00000
#define ELF_SFLAGS_MASKPROC         0xf0000000

#define ELF_PTYPE_NULL      0
#define ELF_PTYPE_LOAD      1
#define ELF_PTYPE_DYNAMIC   2
#define ELF_PTYPE_INTERP    3
#define ELF_PTYPE_NOTE      4
#define ELF_PTYPE_SHLIB     5
#define ELF_PTYPE_PHDR      6
#define ELF_PTYPE_LOOS      0x60000000
#define ELF_PTYPE_HIOS      0x6fffffff
#define ELF_PTYPE_LOPROC    0x70000000
#define ELF_PTYPE_HIPROC    0x7fffffff

struct elfHeader
{
    uint8_t     ident[ELF_NIDENT];
    uint16_t    type;
    uint16_t    machine;
    uint32_t    version;
    uint32_t    entry;
    uint32_t    phoff;
    uint32_t    shoff;
    uint32_t    flags;
    uint16_t    ehsize;
    uint16_t    phentsize;
    uint16_t    phnum;
    uint16_t    shentsize;
    uint16_t    shnum;
    uint16_t    shstrndx;
};


struct elfSectionTable
{
    uint32_t    name;
    uint32_t    type;
    uint32_t    flags;
    uint32_t    addr;
    uint32_t    offset;
    uint32_t    size;
    uint32_t    link;
    uint32_t    info;
    uint32_t    addralign;
    uint32_t    entsize;
};

struct elfSymbolTable
{
    uint32_t    name;
    uint32_t    value;
    uint32_t    size;
    uint8_t     info;
    uint8_t     other;
    uint16_t    shndx;
};

struct selfSymbolInfo
{
    uint16_t boundto;
    uint16_t flags;
};

struct elfReolcationTable
{
    uint32_t    offset;
    uint32_t    info;
};

struct elfReolcationTableAddend
{
    uint32_t    offset;
    uint32_t    info;
    uint32_t    addend;
};

struct elfProgramHeader
{
    uint32_t    type;
    uint32_t    offset;
    uint32_t    vaddr;
    uint32_t    paddr;
    uint32_t    filesz;
    uint32_t    memsz;
    uint32_t    flags;
    uint32_t    align;
};

struct elfDynamicEntry
{
    uint32_t    tag;
    union
    {
        uint32_t val;
        uint32_t ptr;
    } un;
};

#ifdef __KERNEL__

    #include <stdbool.h>
    #include <stdint.h>

    #include <process/process.h>

    bool elfLoadBinary(struct process *p, void *addr, uint32_t length);

#endif

#endif /* _H_ELF_ */