X86-jmp
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- 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 or unreal mode
JMP EAX ; Jumps to the value stored in the register EAX.
; only works in protected mode
There are many different forms of jumps; Relative jumps, conditional jumps, absolute jumps and register-depending jumps.
JMP $ is commonly used to hang the computer. The $ is used to refer to the same location where the instruction starts. That means that the instruction will jump to itself and thereby creating an endless loop.
See also: conditional jumps.