As discussed at LSF/MM/BPF, the sentence about using R0 for returning
values from calls is part of the calling convention and belongs in
abi.rst. Any further additions or clarifications to this text are left
for future patches on abi.rst. The current patch is simply to unblock
progression of instruction-set.rst to a standard.
In contrast, the restriction of register numbers to the range 0-10
is untouched, left in the instruction-set.rst definition of the
src_reg and dst_reg fields.
Signed-off-by: Dave Thaler <dthaler1968@xxxxxxxxxxxxxx>
---
Documentation/bpf/standardization/abi.rst | 3 +++
Documentation/bpf/standardization/instruction-set.rst | 3 ---
2 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/Documentation/bpf/standardization/abi.rst b/Documentation/bpf/standardization/abi.rst
index 0c2e10eeb..41514137c 100644
--- a/Documentation/bpf/standardization/abi.rst
+++ b/Documentation/bpf/standardization/abi.rst
@@ -23,3 +23,6 @@ The BPF calling convention is defined as:
R0 - R5 are scratch registers and BPF programs needs to spill/fill them if
necessary across calls.
+
+The BPF program needs to store the return value into register R0 before doing an
+``EXIT``.
diff --git a/Documentation/bpf/standardization/instruction-set.rst b/Documentation/bpf/standardization/instruction-set.rst
index 997560aba..c0d7d74e0 100644
--- a/Documentation/bpf/standardization/instruction-set.rst
+++ b/Documentation/bpf/standardization/instruction-set.rst
@@ -475,9 +475,6 @@ the jump instruction. Thus 'PC += 1' skips execution of the next
instruction if it's a basic instruction or results in undefined behavior
if the next instruction is a 128-bit wide instruction.
-The BPF program needs to store the return value into register R0 before doing an
-``EXIT``.
-
Example:
``{JSGE, X, JMP32}`` means::
--
2.40.1
