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gtker
111 lines
5.4 KiB
Plaintext
111 lines
5.4 KiB
Plaintext
# 110 lines 78 code 7 comments 25 blanks
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# SPDX-FileCopyrightText: 2019 Jeremiah Orians <jeremiah@pdp10.guru>
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#
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# SPDX-License-Identifier: GPL-3.0-or-later
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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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&_start 00 00 00 00 ## e_entry Address of the entry point (Number of bytes this header is + Base Address)
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%ELF_program_headers>ELF_base 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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&ELF_base 00 00 00 00 ## p_vaddr
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&ELF_base 00 00 00 00 ## p_physaddr
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%ELF_end>ELF_base 00 00 00 00 ## p_filesz
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%ELF_end>ELF_base 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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:_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 output name
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48C7C6 41020000 ; mov_rsi, %577 # Prepare file as O_WRONLY|O_CREAT|O_TRUNC
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48C7C2 80010000 ; mov_rdx, %384 # Prepare file as RW for owner only (600 in octal)
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48C7C0 02000000 ; mov_rax, %2 # the syscall number for open()
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0F05 ; syscall # Now open that file
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4989C7 ; mov_r15,rax # Preserve the file pointer we were given
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48C7C0 0C000000 ; mov_rax, %12 # the Syscall # for SYS_BRK
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48C7C7 00000000 ; mov_rdi, %0 # Get current brk
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0F05 ; syscall # Let the kernel do the work
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4989C6 ; mov_r14,rax # Set our malloc pointer
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48C7C0 0C000000 ; mov_rax, %12 # the Syscall # for SYS_BRK
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4C89F7 ; mov_r14,rax # Using current pointer
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4881C7 00001000 ; add_rdi, %0x100000 # Allocate 1MB
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0F05 ; syscall # Let the kernel do the work
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:core
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5F ; pop_rdi # Get the actual input name
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4883FF 00 ; cmp_rdi, !0 # Check for null string
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0F84 %done ; je %done # Hit null be done
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48C7C6 00000000 ; mov_rsi, %0 # prepare read_only
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48C7C2 00000000 ; mov_rdx, %0 # prevent any interactions
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48C7C0 02000000 ; mov_rax, %2 # the syscall number for open()
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0F05 ; syscall # Now open that damn file
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4989C5 ; mov_r13,rax # Protect INPUT
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:keep
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48C7C2 00001000 ; mov_rdx, %0x100000 # set the size of chars we want
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4C89F6 ; mov_rsi,r14 # Where to put it
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4C89EF ; mov_rdi,r13 # Where are we reading from
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48C7C0 00000000 ; mov_rax, %0 # the syscall number for read
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0F05 ; syscall # call the Kernel
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50 ; push_rax # Protect the number of bytes read
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4889C2 ; mov_rdx,rax # Number of bytes to write
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4C89F6 ; mov_rsi,r14 # What we are writing
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4C89FF ; mov_rdi,r15 # Write to target file
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48C7C0 01000000 ; mov_rax, %1 # the syscall number for write
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0F05 ; syscall # call the Kernel
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58 ; pop_rax # Get bytes read
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483D 00001000 ; cmp_rax, %0x100000 # Check if buffer was fully used
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0F84 %keep ; je %keep # Keep looping if was full
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E9 %core ; jmp %core # Otherwise move to next file
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:done
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# program completed Successfully
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48C7C7 00000000 ; mov_rdi, %0 # All is well
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48C7C0 3C000000 ; mov_rax, %0x3C # put the exit syscall number in eax
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0F05 ; syscall # Call it a good day
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:ELF_end
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