diff options
| author | Christoph Hellwig <hch@lst.de> | 2022-01-03 21:35:54 +0300 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2022-01-06 00:11:26 +0300 |
| commit | 03c517ee9eedd95472c36c6291fc97368b48c9e4 (patch) | |
| tree | 93c97219d42e9eebdb404997b126fad27249fba0 /Documentation/bpf | |
| parent | 894cda554c3c3dc836f3cc873c47a465ba9433b4 (diff) | |
| download | linux-03c517ee9eedd95472c36c6291fc97368b48c9e4.tar.xz | |
bpf, docs: Fully document the ALU opcodes
Add pseudo-code to document all the different BPF_ALU / BPF_ALU64
opcodes.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20220103183556.41040-5-hch@lst.de
Diffstat (limited to 'Documentation/bpf')
| -rw-r--r-- | Documentation/bpf/instruction-set.rst | 30 |
1 files changed, 15 insertions, 15 deletions
diff --git a/Documentation/bpf/instruction-set.rst b/Documentation/bpf/instruction-set.rst index 2987cbb07f7f..efba4d193185 100644 --- a/Documentation/bpf/instruction-set.rst +++ b/Documentation/bpf/instruction-set.rst @@ -82,24 +82,24 @@ BPF_ALU uses 32-bit wide operands while BPF_ALU64 uses 64-bit wide operands for otherwise identical operations. The code field encodes the operation as below: - ======== ===== ========================= + ======== ===== ========================== code value description - ======== ===== ========================= - BPF_ADD 0x00 - BPF_SUB 0x10 - BPF_MUL 0x20 - BPF_DIV 0x30 - BPF_OR 0x40 - BPF_AND 0x50 - BPF_LSH 0x60 - BPF_RSH 0x70 - BPF_NEG 0x80 - BPF_MOD 0x90 - BPF_XOR 0xa0 - BPF_MOV 0xb0 mov reg to reg + ======== ===== ========================== + BPF_ADD 0x00 dst += src + BPF_SUB 0x10 dst -= src + BPF_MUL 0x20 dst \*= src + BPF_DIV 0x30 dst /= src + BPF_OR 0x40 dst \|= src + BPF_AND 0x50 dst &= src + BPF_LSH 0x60 dst <<= src + BPF_RSH 0x70 dst >>= src + BPF_NEG 0x80 dst = ~src + BPF_MOD 0x90 dst %= src + BPF_XOR 0xa0 dst ^= src + BPF_MOV 0xb0 dst = src BPF_ARSH 0xc0 sign extending shift right BPF_END 0xd0 endianness conversion - ======== ===== ========================= + ======== ===== ========================== BPF_ADD | BPF_X | BPF_ALU means:: |