/* Copyright (C) 2008  Emmanuel Varoquaux

   This file is part of XOS.

   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>. */

#ifndef _ELF_H
#define _ELF_H

#define EI_MAG0                 0
#define EI_MAG1                 1
#define EI_MAG2                 2
#define EI_MAG3                 3
#define EI_CLASS                4
#define EI_DATA                 5
#define EI_VERSION              6
#define EI_PAD                  7
#define EI_NIDENT               16

#define ET_NONE                 0
#define ET_REL                  1
#define ET_EXEC                 2
#define ET_DYN                  3
#define ET_CORE                 4
#define ET_LOPROC               0xff00
#define ET_HIPROC               0xffff

#define EM_NONE                 0
#define EM_M32                  1
#define EM_SPARC                2
#define EM_386                  3
#define EM_68K                  4
#define EM_88K                  5
#define EM_860                  7
#define EM_MIPS                 8
#define EM_MIPS_RS4_BE          10

#define EV_NONE                 0
#define EV_CURRENT              1

#define ELFMAG0                 0x7f
#define ELFMAG1                 'E'
#define ELFMAG2                 'L'
#define ELFMAG3                 'F'

#define ELFCLASSNONE            0
#define ELFCLASS32              1
#define ELFCLASS64              2

#define ELFDATANONE             0
#define ELFDATA2LSB             1
#define ELFDATA2MSB             2

#define SHN_UNDEF               0
#define SHN_LORESERVE           0xff00
#define SHN_LOPROC              0xff00
#define SHN_HIPROC              0xff1f
#define SHN_ABS                 0xfff1
#define SHN_COMMON              0xfff2
#define SHN_HIRESERVE           0xffff

#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

#define SHF_WRITE               0x1
#define SHF_ALLOC               0x2
#define SHF_EXECINSTR           0x4
#define SHF_MASKPROC            0xf0000000

#define STN_UNDEF               0

#define STB_LOCAL               0
#define STB_GLOBAL              1
#define STB_WEAK                2
#define STB_LOPROC              13
#define STB_HIPROC              15

#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

#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

#define ELF32_ST_BIND(i)        ((i) >> 4)
#define ELF32_ST_TYPE(i)        ((i) & 0xf)
#define ELF32_ST_INFO(b, t)     (((b) << 4) + ((t) & 0xf))

#define ELF32_R_SYM(i)          ((i) >> 8)
#define ELF32_R_TYPE(i)         ((unsigned char)(i))
#define ELF32_R_INFO(s, t)      (((s) << 8) + (unsigned char)(t))

typedef unsigned long           Elf32_Addr;
typedef unsigned short          Elf32_Half;
typedef unsigned long           Elf32_Off;
typedef signed long             Elf32_Sword;
typedef unsigned long           Elf32_Word;

typedef struct __attribute__ ((packed)) {
  unsigned char 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;
} Elf32_Ehdr;

typedef struct __attribute__ ((packed)) {
  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;
} Elf32_Shdr;

typedef struct __attribute__ ((packed)) {
  Elf32_Word            st_name;
  Elf32_Addr            st_value;
  Elf32_Word            st_size;
  unsigned char         st_info;
  unsigned char         st_other;
  Elf32_Half            st_shndx;
} Elf32_Sym;

typedef struct __attribute__ ((packed)) {
  Elf32_Addr            r_offset;
  Elf32_Word            r_info;
} Elf32_Rel;

typedef struct __attribute__ ((packed)) {
  Elf32_Addr            r_offset;
  Elf32_Word            r_info;
  Elf32_Sword           r_addend;
} Elf32_Rela;

typedef struct __attribute__ ((packed)) {
  Elf32_Word            p_type;
  Elf32_Off             p_offset;
  Elf32_Addr            p_vaddr;
  Elf32_Addr            p_paddr;
  Elf32_Word            p_filesz;
  Elf32_Word            p_memsz;
  Elf32_Word            p_flags;
  Elf32_Word            p_align;
} Elf32_Phdr;

#endif