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Writing an ELF binary by hand

C 86.04% Assembly 13.96%

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elf-binary's Issues

Minimize the assembly code

There are some but not all possible size optimizations applied to the assembly code.

One can:

only work on 32-bit registers - they are automatically zero-extended to 64-bit
update only parts of the lower registers
assume the output of the syscall

With them the code boils down to 23 bytes:

  401000:       31 c0                   xor    %eax,%eax
  401002:       b0 01                   mov    $0x1,%al
  401004:       89 c7                   mov    %eax,%edi
  401006:       be 00 10 40 00          mov    $0x401000,%esi
  40100b:       31 d2                   xor    %edx,%edx
  40100d:       b2 07                   mov    $0x7,%dl
  40100f:       0f 05                   syscall
  401011:       31 ff                   xor    %edi,%edi
  401013:       b0 3c                   mov    $0x3c,%al
  401015:       0f 05                   syscall

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