### Copyright (C) 2016 Jeremiah Orians
### Copyright (C) 2017,2019 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
###
### This file is part of GNU Mes.
###
### GNU Mes 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.
###
### GNU Mes 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 GNU Mes.  If not, see <http://www.gnu.org/licenses/>.

### Commentary:

# elf64-0header.hex2: Simplest 64 bit elf header in hex2.  Only a text
# segment, no data segment, no symbol tables.

# stage0's hex2 format for x86_64
#    !<label>          1 byte relative
#    $<label>          2 byte address
#    @<label>          2 byte relative
#    &<label>          4 byte address
#    %<label>          4 byte relative
#    local_<label>     function-local
#    string_<index>    string #<index>

### Code:

:ELF_base
7F 45 4C 46                    # e_ident[EI_MAG0-3] ELF's magic number

02                             # e_ident[EI_CLASS] Indicating 64 bit
01                             # e_ident[EI_DATA] Indicating little endianness
01                             # e_ident[EI_VERSION] Indicating original elf

00                             # e_ident[EI_OSABI] Set at 0 because none cares
00                             # e_ident[EI_ABIVERSION] See above

00 00 00 00 00 00 00           # e_ident[EI_PAD]

02 00                          # e_type Indicating Executable
3E 00                          # e_machine Indicating AMD64
01 00 00 00                    # e_version Indicating original elf

&ELF_text 00 00 00 00          # e_entry Address of the entry point
%ELF_program_headers>ELF_base  # e_phoff Address of program header table
  00 00 00 00

00 00 00 00 00 00 00 00        # e_shoff Address of section header table

00 00 00 00                    # e_flags

40 00                          # e_ehsize Indicating our 64 Byte header

38 00                          # e_phentsize size of a program header table
01 00                          # e_phnum number of entries in program table

00 00                          # e_shentsize size of a section header table
00 00                          # e_shnum number of entries in section table

00 00                          # e_shstrndx index of the section names

# @40
:ELF_program_headers
:ELF_program_header__text
01 00 00 00                    # ph_type: PT-LOAD = 1
07 00 00 00                    # ph_flags: PF-X|PF-W|PF-R = 7
00 00 00 00 00 00 00 00        # p_offset
&ELF_base 00 00 00 00          # ph_vaddr
&ELF_base 00 00 00 00          # ph_physaddr
%ELF_end>ELF_base 00 00 00 00  # ph_filesz
%ELF_end>ELF_base 00 00 00 00  # ph_memsz
01 00 00 00 00 00 00 00        # ph_align

00 00 00 00 00 00 00 00        # align to @80
# @80
:ELF_text
