226 lines
7.6 KiB
Plaintext
226 lines
7.6 KiB
Plaintext
### Copyright (C) 2016 Jeremiah Orians
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### Copyright (C) 2017,2019 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
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###
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### This file is part of GNU Mes.
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###
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### GNU Mes is free software; you can redistribute it and/or modify it
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### 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 (at
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### your option) any later version.
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###
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### GNU Mes is distributed in the hope that it will be useful, but
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### 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 GNU Mes. If not, see <http://www.gnu.org/licenses/>.
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### Commentary:
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# elf32-header.hex2: 32 bit elf header in hex2, with text segment, data
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# segment and symbol tables.
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# stage0's hex2 format for x86
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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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# local_<label> function-local
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# string_<index> string #<index>
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### Code:
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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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03 00 # e_machine Indicating 32bit x86
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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 00 00 00 # 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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# @34
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00 00 00 00
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00 00 00 00
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00 00 00 00
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# @40
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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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01 00 00 00 # ph_align
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# @60
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#:ELF_program_header__data # NOT USED
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# FIXME: linux 4.17 does not allow this overlap
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# Uhuuh, elf segment at 0000000001000000
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# requested but the memory is mapped already
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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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01 00 00 00 # ph_align
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# @80
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:ELF_comment
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4d 45 53 00 # MES
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00 00 00 00 # align
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00 00 00 00
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00 00 00 00
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4d 45 53 00 # MES
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00 00 00 00 # align
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00 00 00 00
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00 00 00 00
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# @a0
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:ELF_shstr
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00
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:ELF_shstr__text
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2e 74 65 78 74 00 # .text
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:ELF_shstr__data
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2e 64 61 74 61 00 # .data
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:ELF_shstr__comment
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2e 63 6f 6d 6d 65 6e 74 00 # .comment
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:ELF_shstr__shstr
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2e 73 68 73 74 72 74 61 62 00 # .shstrtab
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:ELF_shstr__sym
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2e 73 79 6d 74 61 62 00 # .symtab
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:ELF_shstr__str
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2e 73 74 72 74 61 62 00 # .strtab
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# @d0
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:ELF_section_headers
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00 00 00 00 # sh_name
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00 00 00 00 # sh_type
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00 00 00 00 # sh_flags
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00 00 00 00 # sh_addr
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00 00 00 00 # sh_offset
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00 00 00 00 # sh_length
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00 00 00 00 # sh_link
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00 00 00 00 # sh_info
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01 00 00 00 # sh_1?
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00 00 00 00 # sh_entsize
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## FIXME: M0 for calculations?
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:ELF_section_header_text
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%ELF_shstr__text>ELF_shstr # sh_name
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01 00 00 00 # sh_type = SHT_PROGBITS = 1
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06 00 00 00 # sh_flags = SHF-ALLOC|SHF-EXEC =2 | 4 = 6
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&ELF_text # sh_addr
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%ELF_text>ELF_base # sh_offset
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%ELF_data>ELF_text # sh_length
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00 00 00 00 # sh_link
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00 00 00 00 # sh_info
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01 00 00 00 # sh_1?
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00 00 00 00 # sh_entsize
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:ELF_section_header_data
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%ELF_shstr__data>ELF_shstr # sh_name
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01 00 00 00 # sh_type = SHT_PROGBITS = 1
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03 00 00 00 # sh_flags = SHF-WRITE|SHF-ALLOC = 1 | 2 = 3
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&ELF_data # sh_addr
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%ELF_data>ELF_base # sh_offset
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%ELF_sym>ELF_data # sh_length
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00 00 00 00 # sh_link
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00 00 00 00 # sh_info
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01 00 00 00 # sh_1?
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00 00 00 00 # sh_entsize
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:ELF_section_header_comment
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%ELF_shstr__comment>ELF_shstr # sh_name
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01 00 00 00 # sh_type = SHT_PROGBITS = 1
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00 00 00 00 # sh_flags
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&ELF_comment # sh_addr
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%ELF_comment>ELF_base # sh_offset
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%ELF_shstr>ELF_comment # sh_length
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00 00 00 00 # sh_link
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00 00 00 00 # sh_info
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01 00 00 00 # sh_1?
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00 00 00 00 # sh_entsize
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:ELF_section_header_shstr
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%ELF_shstr__shstr>ELF_shstr # sh_name
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03 00 00 00 # sh_type: str-sht-strtab
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00 00 00 00 # sh_flags
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&ELF_shstr # sh_addr
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%ELF_shstr>ELF_base # sh_offset
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%ELF_section_headers>ELF_shstr # sh_length
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00 00 00 00 # sh_link
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00 00 00 00 # sh_info
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01 00 00 00 # sh_1?
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00 00 00 00 # sh_entsize
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:ELF_section_header_sym
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%ELF_shstr__sym>ELF_shstr # sh_name
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02 00 00 00 # sh_type: str-sht-symtab
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00 00 00 00 # sh_flags
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&ELF_sym # sh_addr
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%ELF_sym>ELF_base # sh_offset
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%ELF_end>ELF_sym # sh_length
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06 00 00 00 # sh_link:6
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00 00 00 00 # sh_info
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01 00 00 00 # sh_1?
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10 00 00 00 # sh_entsize
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:ELF_section_header_str
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%ELF_shstr__str>ELF_shstr # sh_name
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03 00 00 00 # sh_type: str-sht-strtab
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00 00 00 00 # sh_flags
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&ELF_str # sh_addr
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%ELF_str>ELF_base # sh_offset
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%ELF_sym>ELF_str # sh_length
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00 00 00 00 # sh_link
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00 00 00 00 # sh_info
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01 00 00 00 # sh_1?
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00 00 00 00 # sh_entsize
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# @1e8
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00 00 00 00 # align
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00 00 00 00
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# @1f0
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00 00 00 00 # align
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00 00 00 00
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00 00 00 00
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00 00 00 00
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# @200
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:ELF_text
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