X86-jmp

• check: do long jumps and near have 4 and 2 byte offset?

"JMP" is a mnemonic used in x86 assembly language.

unconditional jump (JuMP) to the address that follows, like this:

JMP 0x89AB          ; loads IP with the new value 0x89AB

JMP 0xACDC:0x5578   ; loads CS with 0xACDC and IP with 0x5578

                    ; only works in real mode


JMP 0x56789AB1      ; loads IP with the value 0x56789AB1

                    ; only works in protected mode

We divide jump instructions into short jumps (one byte offset), near jumps (two byte offset?) long jumps (4bytes?) and far jumps (2 bytes segment / selector and full IP / EIP).

JMP $ is commonly used to hang the computer.

See also: conditional jumps.

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