From: Christoph Hellwig <hch@lst.de>
Date: Mon, 3 Jan 2022 19:35:53 +0100
Subject: bpf, docs: Document the opcode classes
Patch-mainline: v5.17-rc1
Git-commit: 894cda554c3c3dc836f3cc873c47a465ba9433b4
References: jsc#PED-1368
Add a description for each opcode class.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20220103183556.41040-4-hch@lst.de
Acked-by: Shung-Hsi Yu <shung-hsi.yu@suse.com>
---
Documentation/bpf/instruction-set.rst | 24 ++++++++++++------------
1 file changed, 12 insertions(+), 12 deletions(-)
--- a/Documentation/bpf/instruction-set.rst
+++ b/Documentation/bpf/instruction-set.rst
@@ -38,18 +38,18 @@ Instruction classes
The three LSB bits of the 'opcode' field store the instruction class:
- ========= =====
- class value
- ========= =====
- BPF_LD 0x00
- BPF_LDX 0x01
- BPF_ST 0x02
- BPF_STX 0x03
- BPF_ALU 0x04
- BPF_JMP 0x05
- BPF_JMP32 0x06
- BPF_ALU64 0x07
- ========= =====
+ ========= ===== ===============================
+ class value description
+ ========= ===== ===============================
+ BPF_LD 0x00 non-standard load operations
+ BPF_LDX 0x01 load into register operations
+ BPF_ST 0x02 store from immediate operations
+ BPF_STX 0x03 store from register operations
+ BPF_ALU 0x04 32-bit arithmetic operations
+ BPF_JMP 0x05 64-bit jump operations
+ BPF_JMP32 0x06 32-bit jump operations
+ BPF_ALU64 0x07 64-bit arithmetic operations
+ ========= ===== ===============================
Arithmetic and jump instructions
================================