235 lines
7.5 KiB
Plaintext
235 lines
7.5 KiB
Plaintext
### 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 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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### elf64.hex2: 64 bit elf header in hex2
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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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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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03 ## e_ident[EI_OSABI] Set at 3 because FreeBSD is strict
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00 ## e_ident[EI_ABIVERSION] Set at 0 because none cares
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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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78 00 60 00 00 00 00 00 ## e_entry Address of the entry point (Number of bytes this header is + Base Address)
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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
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#:ELF_program_headers
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01 00 00 00 ## p_type
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07 00 00 00 ## ph_flags: PF-X|PF-W|PF-R = 7
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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 60 00 00 00 00 00 ## p_physaddr
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95 01 00 00 00 00 00 00 ## p_filesz
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95 01 00 00 00 00 00 00 ## p_memsz
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01 00 00 00 00 00 00 00 ## Required alignment
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#:ELF_text
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# Where the ELF Header is going to hit
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# Simply jump to _start
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# Our main function
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#:_start
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58 ; POP_RAX # Get the number of arguments
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5F ; POP_RDI # Get the program name
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5F ; POP_RDI # Get the actual input name
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BE 00000000 ; LOADI32_ESI %0 # prepare read_only
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B8 02000000 ; LOADI32_EAX %2 # the syscall number for open()
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0F05 ; SYSCALL # Now open that damn file
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4989C1 ; COPY_RAX_to_R9 # Preserve the file pointer we were given
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5F ; POP_RDI # Get the actual output name
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BE 41020000 ; LOADI32_ESI %577 # Prepare file as O_WRONLY|O_CREAT|O_TRUNC
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BA C0010000 ; LOADI32_EDX %448 # Prepare file as RWX for owner only (700 in octal)
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B8 02000000 ; LOADI32_EAX %2 # the syscall number for open()
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0F05 ; SYSCALL # Now open that damn file
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4989C2 ; COPY_RAX_to_R10 # Preserve the file pointer we were given
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# Our flag for byte processing
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49C7C7 FFFFFFFF ; LOADI32_R15 %-1
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# temp storage for the sum
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49C7C6 00000000 ; LOADI32_R14 %0
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#:loop
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# Read a byte
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E8 BA000000 ; CALLI32 %read_byte
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# process byte
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E8 34000000 ; CALLI32 %hex
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# deal with -1 values
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4883F8 00 ; CMP_RAX_Immediate8 !0
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7C F0 ; JL8 !loop
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# deal with toggle
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4983FF 00 ; CMP_R15_Immediate8 !0
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7D 0C ; JGE8 !print
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# process first byte of pair
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4989C6 ; MOVE_R14_RAX
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49C7C7 00000000 ; LOADI32_R15 %0
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EB DE ; JMP8 !loop
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# process second byte of pair
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#:print
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# update the sum and store in output
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49C1E6 04 ; SHL_R14_Immediate8 !4
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4C01F0 ; ADD_RAX_R14
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880425 68016000 ; STORE8_al_Absolute32 &output
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# flip the toggle
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49C7C7 FFFFFFFF ; LOADI32_R15 %-1
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E8 6A000000 ; CALLI32 %write_byte
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EB C2 ; JMP8 !loop
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#:hex
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# Purge Comment Lines (#)
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4883F8 23 ; CMP_RAX_Immediate8 !35
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74 2C ; JE8 !purge_comment
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# Purge Comment Lines (;)
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4883F8 3B ; CMP_RAX_Immediate8 !59
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74 26 ; JE8 !purge_comment
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# deal all ascii less than '0'
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4883F8 30 ; CMP_RAX_Immediate8 !48
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7C 42 ; JL8 !ascii_other
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# deal with 0-9
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4883F8 3A ; CMP_RAX_Immediate8 !58
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7C 2D ; JL8 !ascii_num
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# deal with all ascii less than 'A'
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4883F8 41 ; CMP_RAX_Immediate8 !65
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7C 36 ; JL8 !ascii_other
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# deal with 'A'-'F'
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4883F8 47 ; CMP_RAX_Immediate8 !71
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7C 2B ; JL8 !ascii_high
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# deal with all ascii less than 'a'
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4883F8 61 ; CMP_RAX_Immediate8 !97
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7C 2A ; JL8 !ascii_other
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#deal with 'a'-'f'
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4883F8 67 ; CMP_RAX_Immediate8 !103
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7C 1A ; JL8 !ascii_low
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# The rest that remains needs to be ignored
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EB 22 ; JMP8 !ascii_other
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#:purge_comment
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# Read a byte
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E8 4A000000 ; CALLI32 %read_byte
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# Loop if not LF
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4883F8 0A ; CMP_RAX_Immediate8 !10
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75 F5 ; JNE8 !purge_comment
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# Otherwise return -1
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48C7C0 FFFFFFFF ; LOADI32_RAX %-1
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C3 ; RETQ
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#:ascii_num
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4883E8 30 ; SUB_RAX_Immediate8 !48
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C3 ; RETQ
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#:ascii_low
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4883E8 57 ; SUB_RAX_Immediate8 !87
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C3 ; RETQ
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#:ascii_high
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4883E8 37 ; SUB_RAX_Immediate8 !55
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C3 ; RETQ
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#:ascii_other
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48C7C0 FFFFFFFF ; LOADI32_RAX %-1
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C3 ; RETQ
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#:Done
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# program completed Successfully
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BF 00000000 ; LOADI32_EDI %0 # All is well
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B8 3C000000 ; LOADI32_RAX %60 # put the exit syscall number in rax
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0F05 ; SYSCALL # Call it a good day
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#:write_byte
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# Print our Hex
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BA 01000000 ; LOADI32_EDX %1 # set the size of chars we want
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BE 68016000 ; LOADI32_ESI %output # What we are writing
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4C89D7 ; COPY_R10_to_RDI # Where are we writing to
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B8 01000000 ; LOADI32_EAX %1 # the syscall number for write
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0F05 ; SYSCALL # call the Kernel
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C3 ; RET
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# Where we are putting our output
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#:output
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# Reserve 4bytes of Zeros
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00000000 ; NULL
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#:read_byte
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# Attempt to read 1 byte from STDIN
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BA 01000000 ; LOADI32_EDX %1 # set the size of chars we want
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BE 91016000 ; LOADI32_ESI &input # Where to put it
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4C89CF ; COPY_R9_to_RDI # Where are we reading from
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B8 00000000 ; LOADI32_EAX %0 # the syscall number for read
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0F05 ; SYSCALL # call the Kernel
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4885C0 ; TEST_RAX_RAX # check what we got
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74 C2 ; JE8 !Done # Got EOF call it done
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# load byte
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8A0425 91016000 ; LOAD8_al_Absolute32 &input # load char
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480FB6C0 ; MOVZBQ_RAX_AL # We have to zero extend it to use it
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C3 ; RET
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# Where we get our input
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#:input
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# Reserve 4bytes of Zeros
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00000000 ; NULL
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#:ELF_end
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