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/*

 * Copyright (C) 2006 Sergey Bondari

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * - Redistributions of source code must retain the above copyright

 *   notice, this list of conditions and the following disclaimer.

 * - 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.

 * - The name of the author may not be used to endorse or promote products

 *   derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 __ELF32_H__

#define __ELF32_H__

#include <arch/types.h>

#include <mm/as.h>

/**

 * current ELF version

 */

#define EV_CURRENT  1

/**

 * ELF types

 */

#define ET_NONE     0   // No type

#define ET_REL      1   // Relocatable file

#define ET_EXEC     2   // Executable

#define ET_DYN      3   // Shared object

#define ET_CORE     4   // Core

#define ET_LOPROC   0xff00  // Processor specific

#define ET_HIPROC   0xffff  // Processor specific

/**

 * ELF machine types

 */

#define EM_NO       0   // No machine

#define EM_M32      1   // AT&T WE 32100

#define EM_SPARC    2   // SPARC

#define EM_386      3   // i386

#define EM_68K      4   // Motorola 68000

#define EM_88K      5   // Motorola 88000

#define EM_860      7   // i80860

#define EM_MIPS     8   // MIPS RS3000

/**

 * ELF identification indexes

 */

#define EI_MAG0     0

#define EI_MAG1     1

#define EI_MAG2     2

#define EI_MAG3     3

#define EI_CLASS    4   // File class

#define EI_DATA     5   // Data encoding

#define EI_VERSION  6   // File version

#define EI_PAD      7   // Start of padding bytes

#define EI_NIDENT   16  // ELF identification table size

/**

 * ELF magic number

 */

#define ELFMAG0     0x7f

#define ELFMAG1     'E'

#define ELFMAG2     'L'

#define ELFMAG3     'F'

/**

 * ELF file classes

 */

#define ELFCLASSNONE    0

#define ELFCLASS32  1

#define ELFCLASS64  2

/**

 * ELF data encoding types

 */

#define ELFDATANONE 0

#define ELFDATA2LSB 1   // Least significant byte first (little endian)

#define ELFDATA2MSB 2   // Most signigicant byte first (Big endian)

/**

 * ELF error return codes

 */

#define EE_OK           0   // No error

#define EE_INVALID      1   // invalid ELF image

#define EE_MEMORY       2   // cannot allocate address space

#define EE_INCOMPATIBLE     3   // ELF image is not compatible with current architecture

#define EE_UNSUPPORTED      4   // Non-supported ELF (e.g. dynamic ELFs)

/**

 * ELF section types

 */

#define SHT_NULL        0

#define SHT_PROGBITS        1

#define SHT_SYMTAB      2

#define SHT_STRTAB      3

#define SHT_RELA        4

#define SHT_HASH        5

#define SHT_DYNAMIC     6

#define SHT_NOTE        7

#define SHT_NOBITS      8

#define SHT_REL         9

#define SHT_SHLIB       10

#define SHT_DYNSYM      11

#define SHT_LOPROC      0x70000000

#define SHT_HIPROC      0x7fffffff

#define SHT_LOUSER      0x80000000

#define SHT_HIUSER      0xffffffff

/**

 * ELF section flags

 */

#define SHF_WRITE       0x1 

#define SHF_ALLOC       0x2

#define SHF_EXECINSTR       0x4

#define SHF_MASKPROC        0xf0000000

/**

 * Symbol binding

 */

#define STB_LOCAL       0

#define STB_GLOBAL      1

#define STB_WEAK        2

#define STB_LOPROC      13

#define STB_HIPROC      15

/**

 * Symbol types

 */

#define STT_NOTYPE      0

#define STT_OBJECT      1

#define STT_FUNC        2

#define STT_SECTION     3

#define STT_FILE        4

#define STT_LOPROC      13

#define STT_HIPROC      15

/**

 * Program segment types

 */

#define PT_NULL         0

#define PT_LOAD         1

#define PT_DYNAMIC      2

#define PT_INTERP       3

#define PT_NOTE         4

#define PT_SHLIB        5

#define PT_PHDR         6

#define PT_LOPROC       0x70000000

#define PT_HIPROC       0x7fffffff

/**

 * 32-bit ELF data types

 */

typedef __u32 elf32_addr;

typedef __u16 elf32_half;

typedef __u32 elf32_off;

typedef int elf32_sword;

typedef __u32 elf32_word;

/**

 * 32-bit ELF header

 */

struct elf32_header {

    __u8 e_ident[EI_NIDENT];

    elf32_half e_type;

    elf32_half e_machine;

    elf32_word e_version;

    elf32_addr e_entry;

    elf32_off e_phoff;

    elf32_off e_shoff;

    elf32_word e_flags;

    elf32_half e_ehsize;

    elf32_half e_phentsize;

    elf32_half e_phnum;

    elf32_half e_shentsize;

    elf32_half e_shnum;

    elf32_half e_shstrndx;

};

/*

 * 32-bit ELF section header

 */

struct elf32_section_header {

    elf32_word sh_name;

    elf32_word sh_type;

    elf32_word sh_flags;

    elf32_addr sh_addr;

    elf32_off sh_offset;

    elf32_word sh_size;

    elf32_word sh_link;

    elf32_word sh_info;

    elf32_word sh_addralign;

    elf32_word sh_entsize;

};

/*

 * 32-bit ELF symbol table entry

 */

struct elf32_symbol {

    elf32_word st_name;

    elf32_addr st_value;

    elf32_word st_size;

    __u8 st_info;

    __u8 st_other;

    elf32_half st_shndx;

};

/*

 * 32-bit ELF program header

 */

struct elf32_program_header {

    elf32_word p_type;

    elf32_off p_offset;

    elf32_addr pv_addr;

    elf32_addr pp_addr;

    elf32_word p_filesz;

    elf32_word p_memsz;

    elf32_word p_flags;

    elf32_word p_align;

};

typedef struct elf32_header elf32_header_t;

typedef struct elf32_section_header elf32_section_header_t;

typedef struct elf32_symbol elf32_symbol_t;

typedef struct elf32_program_header elf32_program_header_t;

extern int elf32_load(__address header, as_t * as);

#endif