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PC-relative addressing

Naming a piece of data by its distance from the current instruction, so the program works wherever it is loaded in memory.

PC-relative addressing forms an address as the program counter plus a constant fixed at link time; x86-64 writes [rip + symbol] (relative to the next instruction), ARM64 uses adrp plus add, RISC-V auipc plus addi.

Examples

  • lea rax, [rip + table] finds table by its distance from the next instruction, so it works wherever the program is loaded.

See also

auipc adrp program counter
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