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  • Difference between: Opcode, byte code, mnemonics, machine code and . . .
    OPCODE: It is a number interpreted by your machine (virtual or silicon) that represents the operation to perform BYTECODE: Same as machine code, except, its mostly used by a software based interpreter (like Java or CLR) MNEMONIC: English word MNEMONIC means "A device such as a pattern of letters, ideas, or associations that assists in remembering something " So, its usually used by assembly
  • assembly - Intel x86 Opcode Reference? - Stack Overflow
    What is a relatively quick and easy method of looking up what an arbitrary opcode means (say, 0xC8) in x86? The Intel Software Developer's manual isn't very fun to search through
  • assembly - How does an instruction decoder tell the difference between . . .
    The decoder is a state machine It knows where the instruction starts, the prefixes' values, and that prefixes are optional and that they come first One-byte opcodes don't overlap with prefixes, two and three bytes opcodes start with 0f which is not a prefix So the decoder can tell when the opcode starts Alas, Intel reused the prefixes to change meaning to opcodes The decoder takes that
  • c - What is the actual relation between assembly, machine code . . .
    OpCode - The value for a command: In the sample, the opcode for pushing a string is 13 Assembly - human readable instructions for a CPU's internal machine code Pretty much always one assembly instruction per machine code instruction In my code that you linked to, the "assembly" instruction PushString maps to machine instruction 13
  • What is the difference between Mnemonics and Opcode
    Usually opcode refers to the type of operation (ADD), and register B is an operand However, with a fixed and small number of operands, the same operation can have different opcode for all possible operands
  • How to read the Intel Opcode notation - Stack Overflow
    3 1 1 1 Opcode Column in the Instruction Summary Table (Instructions without VEX Prefix) The “Opcode” column in the table above shows the object code produced for each form of the instruction When possible, codes are given as hexadecimal bytes in the same order in which they appear in memory Definitions of entries other than hexadecimal bytes are as follows: • REX W — Indicates the
  • Why call instruction opcode is represented as FF15?
    Why call instruction opcode is represented as FF15? Asked 10 years, 1 month ago Modified 10 years, 1 month ago Viewed 6k times
  • What is the difference between machine code and opcode?
    The question is mostly related to PHP because IMHO opcode is mostly mentioned in PHP context According to this description, here's a transformation process of php code into opcode: php text ->
  • Opcode vs Operand in x86 assembly source code - Stack Overflow
    The opcode is the machine code representation of the instruction Opcode can include the entire instruction's machine code or only the byte or bytes that select the instruction (possibly excluding prefixes, ModR M, SIB, offset, immediate)
  • How is machine code stored in the EXE file? - Stack Overflow
    Note that an opcode is only part of the machine code bytes or bits for a single instruction The rest of the bits encode the operands, if there are any operands that aren't implicit (In some circles, "opcode" is misused to describe whole machine code instructions, so that's probably where the misuse of terminology in this question came from )





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