X86 Accumulation NASM Syntax

 

     syntax looks like:

     mov ax, 9

    This endless the amount 9 into annals ax. Apprehension that the apprenticeship architecture is dest, src. This follows the Intel appearance x86 apprenticeship formatting, as against to the AT&T appearance acclimated by the Gnu Assember. Agenda for humans using gdb with nasm, you can set gdb to use Intel-style disassembly by arising the command:

     set disassembly-flavor intel

    A individual semi-colon is acclimated for comments, and can be acclimated like a bifold carve in C/C++.

    To canyon the atom a simple ascribe command on Linux, you would canyon ethics to the afterward registers and then forward the atom an arrest signal. To apprehend in a individual appearance from accepted ascribe (such as from a user at their keyboard), do the following:

     ; apprehend a byte from stdin

     mov eax, 3 ; 3 is accustomed by the arrangement as acceptation input

     mov edx, 1 ; ascribe breadth (one byte)

     mov ecx, variable ; abode to canyon to

     mov ebx, 1 ; apprehend from accepted input

     int 0x80 ; alarm the kernel

    Outputting follows a agnate convention:

     mov eax, 4 ; the arrangement interprets 4 as output

     mov ecx, capricious ; arrow to the amount getting passed

     mov ebx, 1 ; accepted achievement (print to terminal)

     mov edx, 4 ; breadth of achievement (in bytes)

     int 0x80

    Obviously casual ethics to the registers in altered orders wont affect the beheading if the atom is called, but chief on a alignment can create it acutely easier to read.