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JohnMcPherson |
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Code that can run from any position in memory. All jumps and calls are relative to the current Program Counter. Data is referenced either via an offset from a register or via the PC as well (for constant data and self modifying code). Commonly used with processors such as the Motorola 6809 and the [680x0] (though the Motorola 68000 lacked a 32-bit relative jump, so code was limited to 32KB (or 64KB with some ordering, unless you make use of Jump Islands). The [x86] uses segmented memory instead, so the programs are always loaded at a fixed offset. |
