Commit f980f13e authored by Dave Thaler's avatar Dave Thaler Committed by Alexei Starovoitov
Browse files

bpf, docs: Clarify call local offset 



In the Jump instructions section it explains that the offset is
"relative to the instruction following the jump instruction".
But the program-local section confusingly said "referenced by
offset from the call instruction, similar to JA".

This patch updates that sentence with consistent wording, saying
it's relative to the instruction following the call instruction.

Signed-off-by: default avatarDave Thaler <dthaler1968@gmail.com>
Acked-by: default avatarYonghong Song <yonghong.song@linux.dev>
Link: https://lore.kernel.org/r/20240525153332.21355-1-dthaler1968@gmail.com


Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent 6a6d8b6f

Documentation/bpf/standardization/instruction-set.rst

+4 −3
Original line number Diff line number Diff line
@@ -552,9 +552,10 @@ is outside the scope of this document and is left for future work. 
Program-local functions

~~~~~~~~~~~~~~~~~~~~~~~

Program-local functions are functions exposed by the same BPF program as the

caller, and are referenced by offset from the call instruction, similar to

``JA``.  The offset is encoded in the 'imm' field of the call instruction.

An ``EXIT`` within the program-local function will return to the caller.

caller, and are referenced by offset from the instruction following the call

instruction, similar to ``JA``.  The offset is encoded in the 'imm' field of

the call instruction. An ``EXIT`` within the program-local function will

return to the caller.



Load and store instructions

===========================