donhatchnotes/assembly at master · donhatch/donhatchnotes · GitHub

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Q: reference for assembly language?
A:
    http://en.wikipedia.org/wiki/X86_assembly_language
    http://web.cecs.pdx.edu/~singh/courses/cs200/slides/9.access.pdf
    and just google each instruction

Apparently gcc produces AT&T style assembly, which means:
    - source comes before destination
    - mnemonics are suffixed with letter indicating size of the operands, e.g.
          "q" for qword (8 bytes)
          "l" for dword (4 bytes)
          "w" for word  (2 bytes)
          "b" for byte  (1 byte)
    - immediate values prefixed with $, and registers prefixed with %
    - effective address: DISP(BASE,INDEX,SCALE)
      example:
          movl mem_location(%ebx,%ecx,4), %eax