143 lines
5.1 KiB
Plaintext
143 lines
5.1 KiB
Plaintext
## Copyright (C) 2016 Jeremiah Orians
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## This file is part of stage0.
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##
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## stage0 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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## stage0 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 stage0. If not, see <http://www.gnu.org/licenses/>.
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## Self Bootstrapping Hex Assembler written in Hex
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## And a shitload of comments
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## That can be converted to assembly and compiled
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## ELF Header
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7F 45 4C 46 ## e_ident[EI_MAG0-3] ELF's magic number
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02 ## e_ident[EI_CLASS] Indicating 64 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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00 ## e_ident[EI_OSABI] Set at 0 because none cares
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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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3E 00 ## e_machine Indicating AMD64
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01 00 00 00 ## e_version Indicating original elf
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FB 00 60 00 00 00 00 00 ## e_entry Address of the entry point
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40 00 00 00 00 00 00 00 ## e_phoff Address of program header table
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00 00 00 00 00 00 00 00 ## e_shoff Address of section header table
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00 00 00 00 ## e_flags
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40 00 ## e_ehsize Indicating our 64 Byte header
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38 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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00 00 ## e_shentsize size of a section header table
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00 00 ## e_shnum number of entries in section table
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00 00 ## e_shstrndx index of the section names
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## Program Header table
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01 00 00 00 ## p_type
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06 00 00 00 ## Flags
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00 00 00 00 00 00 00 00 ## p_offset
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00 00 60 00 00 00 00 00 ## p_vaddr
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00 00 00 00 00 00 00 00 ## Undefined
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9B 01 00 00 00 00 00 00 ## p_filesz
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9B 01 00 00 00 00 00 00 ## p_memsz
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00 00 20 00 00 00 00 00 ## Required alignment
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## Hex
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48 83 f8 23 # cmp $0x23,%rax
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74 26 # je 6000a4 <purge_comment>
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48 83 f8 30 # cmp $0x30,%rax
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7c 6f # jl 6000f3 <ascii_other>
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48 83 f8 3a # cmp $0x3a,%rax
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7c 5a # jl 6000e4 <ascii_num>
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48 83 f8 41 # cmp $0x41,%rax
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7c 63 # jl 6000f3 <ascii_other>
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48 83 f8 47 # cmp $0x47,%rax
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7c 58 # jl 6000ee <ascii_high>
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48 83 f8 61 # cmp $0x61,%rax
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7c 57 # jl 6000f3 <ascii_other>
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48 83 f8 67 # cmp $0x67,%rax
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7c 47 # jl 6000e9 <ascii_low>
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eb 4f # jmp 6000f3 <ascii_other>
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## Purge Comment
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48 c7 c2 01 00 00 00 # mov $0x1,%rdx
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48 c7 c6 99 01 60 00 # mov $0x600199,%rsi
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48 c7 c7 00 00 00 00 # mov $0x0,%rdi
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48 c7 c0 00 00 00 00 # mov $0x0,%rax
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0f 05 # syscall
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48 85 c0 # test %rax,%rax
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0f 84 be 00 00 00 # je 600189 <Done>
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8a 04 25 99 01 60 00 # mov 0x600199,%al
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48 0f b6 c0 # movzbq %al,%rax
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48 83 f8 0a # cmp $0xa,%rax
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75 c8 # jne 6000a4 <purge_comment>
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48 c7 c0 ff ff ff ff # mov $0xffffffffffffffff,%rax
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c3 # retq
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## ascii num
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48 83 e8 30 # sub $0x30,%rax
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c3 # retq
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## ascii low
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48 83 e8 57 # sub $0x57,%rax
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c3 # retq
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## ascii high
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48 83 e8 37 # sub $0x37,%rax
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c3 # retq
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## ascii other
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48 c7 c0 ff ff ff ff # mov $0xffffffffffffffff,%rax
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c3 # retq
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## start
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49 c7 c7 ff ff ff ff # mov $0xffffffffffffffff,%r15
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49 c7 c6 00 00 00 00 # mov $0x0,%r14
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## Loop
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48 c7 c2 01 00 00 00 # mov $0x1,%rdx
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48 c7 c6 99 01 60 00 # mov $0x600199,%rsi
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48 c7 c7 00 00 00 00 # mov $0x0,%rdi
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48 c7 c0 00 00 00 00 # mov $0x0,%rax
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0f 05 # syscall
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48 85 c0 # test %rax,%rax
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74 5d # je 600189 <Done>
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8a 04 25 99 01 60 00 # mov 0x600199,%al
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48 0f b6 c0 # movzbq %al,%rax
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e8 3c ff ff ff # callq 600078 <hex>
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48 83 f8 00 # cmp $0x0,%rax
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7c c7 # jl 600109 <loop>
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49 83 ff 00 # cmp $0x0,%r15
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7d 0c # jge 600154 <print>
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49 89 c6 # mov %rax,%r14
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49 c7 c7 00 00 00 00 # mov $0x0,%r15
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eb b5 # jmp 600109 <loop>
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## print
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49 c1 e6 04 # shl $0x4,%r14
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4c 01 f0 # add %r14,%rax
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88 04 25 9a 01 60 00 # mov %al,0x60019a
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49 c7 c7 ff ff ff ff # mov $0xffffffffffffffff,%r15
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48 c7 c2 01 00 00 00 # mov $0x1,%rdx
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48 c7 c6 9a 01 60 00 # mov $0x60019a,%rsi
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48 c7 c7 01 00 00 00 # mov $0x1,%rdi
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48 c7 c0 01 00 00 00 # mov $0x1,%rax
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0f 05 # syscall
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eb 80 # jmp 600109 <loop>
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## Done
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48 c7 c7 00 00 00 00 # mov $0x0,%rdi
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48 c7 c0 3c 00 00 00 # mov $0x3c,%rax
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0f 05 # syscall
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## Place for input, This actually isn't required but here it is
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02 00 00
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