75 lines
2.9 KiB
Plaintext
75 lines
2.9 KiB
Plaintext
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### Copyright (C) 2016 Jeremiah Orians
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### Copyright (C) 2017 Jan Nieuwenhuizen <janneke@gnu.org>
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### This file is part of M2-Planet.
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###
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### M2-Planet is free software: you can redistribute it and/or modify
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### it under the terms of the GNU General Public License as published by
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### the Free Software Foundation, either version 3 of the License, or
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### (at your option) any later version.
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###
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### M2-Planet is distributed in the hope that it will be useful,
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### but WITHOUT ANY WARRANTY; without even the implied warranty of
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### MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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### GNU General Public License for more details.
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###
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### You should have received a copy of the GNU General Public License
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### along with M2-Planet. If not, see <http://www.gnu.org/licenses/>.
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### stage0's hex2 format
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### !<label> 1 byte relative
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### $<label> 2 byte address
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### @<label> 2 byte relative
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### &<label> 4 byte address
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### %<label> 4 byte relative
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### if you wish to use this header, you need to add :ELF_end to the end of your
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### M1 or hex2 files.
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## ELF Header
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:ELF_base
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7F 45 4C 46 # e_ident[EI_MAG0-3] ELF's magic number
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01 # e_ident[EI_CLASS] Indicating 32 bit
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01 # e_ident[EI_DATA] Indicating little endianness
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01 # e_ident[EI_VERSION] Indicating original elf
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03 # e_ident[EI_OSABI] Set at 3 because FreeBSD is strict
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00 # e_ident[EI_ABIVERSION] See above
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00 00 00 00 00 00 00 # e_ident[EI_PAD]
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02 00 # e_type Indicating Executable
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28 00 # e_machine Indicating 32bit ARM
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01 00 00 00 # e_version Indicating original elf
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&_start # e_entry Address of the entry point
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%ELF_program_headers>ELF_base # e_phoff Address of program header table
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%ELF_section_headers>ELF_base # e_shoff Address of section header table
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00 02 00 05 # e_flags
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34 00 # e_ehsize Indicating our 52 Byte header
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20 00 # e_phentsize size of a program header table
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01 00 # e_phnum number of entries in program table
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28 00 # e_shentsize size of a section header table
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05 00 # e_shnum number of entries in section table
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02 00 # e_shstrndx index of the section names
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:ELF_program_headers
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:ELF_program_header__text
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01 00 00 00 # ph_type: PT-LOAD = 1
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00 00 00 00 # ph_offset
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&ELF_base # ph_vaddr
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&ELF_base # ph_physaddr
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%ELF_end>ELF_base # ph_filesz
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%ELF_end>ELF_base # ph_memsz
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07 00 00 00 # ph_flags: PF-X|PF-W|PF-R = 7
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00 00 01 00 # ph_alignment
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:ELF_text
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