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Questions tagged [opcode]

The binary number that represents a machine instruction for a specific processor type.

An Opcode is the binary number that represents a machine instruction for a specific processor type.

Use this tag only for questions specific to the binary representation of machine instructions. Do not use this tag for general assembly language questions.

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assembly - opcodes vs. nasm instructions

So I've tried to get into assembly lately and found myself genuinely confused with how NASM works. As far as I understood it is kind of a 'compiler' for assembly that converts (mnemic) instructions to actual machine code. Now I was wondering what…
encomiastical
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Fortran Opcode Map? Or "Big O" notation or something similar?

I am looking for some type of map or file that will illustrate the amount of work the computer must do to run certain intrinsic functions and loops in Fortran. For example: the amount of decisions needed to run a basic if-then statement checking a…
Kelly
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How to intercept instructions sent to the CPU

I'm looking for a way to intercept instructions sent to the cpu. More specifically op-codes that are being sent in and what thread sent them in.
papadp
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How to get assembly instructions or mnemonics from the opcode/machine code?

I have a binary file compiled using gcc of a simple c program. I'm writing my own dis-assembler, I able to read ELF header and other header from ELF files. I'm reading ".text"section from ELF binary file. And trying to convert the opecode into…
BSalunke
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