This patch elaborates on the use of PC by expanding the PC acronym, explaining the units, and the relative position to which the offset applies. Signed-off-by: Dave Thaler <dthaler1968@xxxxxxxxxxxxxx> --- Documentation/bpf/standardization/instruction-set.rst | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/Documentation/bpf/standardization/instruction-set.rst b/Documentation/bpf/standardization/instruction-set.rst index b44bdacd0..5592620cf 100644 --- a/Documentation/bpf/standardization/instruction-set.rst +++ b/Documentation/bpf/standardization/instruction-set.rst @@ -469,6 +469,11 @@ JSLT 0xc any PC += offset if dst < src signed JSLE 0xd any PC += offset if dst <= src signed ======== ===== ======= ================================= =================================================== +where 'PC' denotes the program counter, and the offset to increment by +is in units of 64-bit instructions relative to the instruction following +the jump instruction. Thus 'PC += 1' results in the next instruction +to execute being two 64-bit instructions later. + The BPF program needs to store the return value into register R0 before doing an ``EXIT``. -- 2.40.1
