Commit 894cda55 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Alexei Starovoitov
Browse files

bpf, docs: Document the opcode classes 



Add a description for each opcode class.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20220103183556.41040-4-hch@lst.de
parent be3193cd

Documentation/bpf/instruction-set.rst

+12 −12
Original line number Diff line number Diff line
@@ -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

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