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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
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
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)
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
How to tell the length of an x86 instruction? - Stack Overflow Terminology: "opcode" is the part of the instruction that selects the operation, not including operands, or non-mandatory prefixes that modify the operation (e g operand-size) Using "opcode" to refer to the whole instruction is incorrect, although done fairly often by some people talking about shellcode Is it something you ought to know from experience With experience looking at machine
linux - How to get opcodes of a c program - Stack Overflow That may be so, but the answer is the same You can disassemble that shellcodeasm program using objdump instead of doing it inside gcc As you can see, the output format gives you the disassembly listing and the opcodes You can do some text processing to cut out the column of bytes and automatically transform them into a C declaration
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 In fact Java is more popular for its byte- opcode 1) Is opcode just a portion of machine code, does machine code consist of opcodes? Yes, but this opcodes are machine-dependent The interesting thing in Java or PHP bytecode is that it's machine independent and runs in a platform-specific virtual