Internet Assigned Numbers Authority

BPF Instructions

Created
2024-07-12
Last Updated
2024-11-06
Available Formats

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Registries included below

BPF Instruction Conformance Groups

Expert(s)
Unassigned
Reference
[RFC9669]
Available Formats

CSV
Range Registration Procedures
Permanent Standards Action or IESG Approval
Provisional Specification Required
Historical Specification Required
Name Description Includes Excludes Status Reference Change Controller
atomic32 32-bit atomic instructions - - Permanent [RFC9669, Section 5.3 (Atomic Operations)] IETF
atomic64 64-bit atomic instructions atomic32 - Permanent [RFC9669, Section 5.3 (Atomic Operations)] IETF
base32 32-bit base instructions - - Permanent [RFC9669] IETF
base64 64-bit base instructions base32 - Permanent [RFC9669] IETF
divmul32 32-bit division and modulo - - Permanent [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
divmul64 64-bit division and modulo divmul32 - Permanent [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
packet Legacy packet instructions - - Historical [RFC9669, Section 5.5 (Legacy BPF Packet Access Instructions)] IETF

BPF Instruction Set

Expert(s)
Unassigned
Reference
[RFC9669]
Available Formats

CSV
Range Registration Procedures
Permanent Standards Action or IESG Approval
Provisional Specification Required
Historical Specification Required
Opcode Src_Reg Offset Imm Description Groups Reference Change Controller
0x00 0x0 0 any (additional immediate value) base64 [RFC9669, Section 5.4 (64-bit Immediate Instructions)] IETF
0x04 0x0 0 any dst = (u32)((u32)dst + (u32)imm) base32 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0x05 0x0 any 0x00 goto +offset base32 [RFC9669, Section 4.3 (Jump Instructions)] IETF
0x06 0x0 0 any goto +imm base32 [RFC9669, Section 4.3 (Jump Instructions)] IETF
0x07 0x0 0 any dst += imm base64 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0x0c any 0 0x00 dst = (u32)((u32)dst + (u32)src) base32 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0x0f any 0 0x00 dst += src base64 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0x14 0x0 0 any dst = (u32)((u32)dst - (u32)imm) base32 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0x15 0x0 any any if dst == imm goto +offset base64 [RFC9669, Section 4.3 (Jump Instructions)] IETF
0x16 0x0 any any if (u32)dst == imm goto +offset base32 [RFC9669, Section 4.3 (Jump Instructions)] IETF
0x17 0x0 0 any dst -= imm base64 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0x18 0x0 0 any dst = (next_imm << 32) | imm base64 [RFC9669, Section 5.4 (64-bit Immediate Instructions)] IETF
0x18 0x1 0 any dst = map_by_fd(imm) base64 [RFC9669, Section 5.4 (64-bit Immediate Instructions)] IETF
0x18 0x2 0 any dst = map_val(map_by_fd(imm)) + next_imm base64 [RFC9669, Section 5.4 (64-bit Immediate Instructions)] IETF
0x18 0x3 0 any dst = var_addr(imm) base64 [RFC9669, Section 5.4 (64-bit Immediate Instructions)] IETF
0x18 0x4 0 any dst = code_addr(imm) base64 [RFC9669, Section 5.4 (64-bit Immediate Instructions)] IETF
0x18 0x5 0 any dst = map_by_idx(imm) base64 [RFC9669, Section 5.4 (64-bit Immediate Instructions)] IETF
0x18 0x6 0 any dst = map_val(map_by_idx(imm)) + next_imm base64 [RFC9669, Section 5.4 (64-bit Immediate Instructions)] IETF
0x1c any 0 0x00 dst = (u32)((u32)dst - (u32)src) base32 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0x1d any any 0x00 if dst == src goto +offset base64 [RFC9669, Section 4.3 (Jump Instructions)] IETF
0x1e any any 0x00 if (u32)dst == (u32)src goto +offset base32 [RFC9669, Section 4.3 (Jump Instructions)] IETF
0x1f any 0 0x00 dst -= src base64 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0x20 0x0 0 any (deprecated, implementation-specific) packet [RFC9669, Section 5.5 (Legacy BPF Packet Access Instructions)] IETF
0x24 0x0 0 any dst = (u32)(dst * imm) divmul32 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0x25 0x0 any any if dst > imm goto +offset base64 [RFC9669, Section 4.3 (Jump Instructions)] IETF
0x26 0x0 any any if (u32)dst > imm goto +offset base32 [RFC9669, Section 4.3 (Jump Instructions)] IETF
0x27 0x0 0 any dst *= imm divmul64 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0x28 0x0 0 any (deprecated, implementation-specific) packet [RFC9669, Section 5.5 (Legacy BPF Packet Access Instructions)] IETF
0x2c any 0 0x00 dst = (u32)(dst * src) divmul32 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0x2d any any 0x00 if dst > src goto +offset base64 [RFC9669, Section 4.3 (Jump Instructions)] IETF
0x2e any any 0x00 if (u32)dst > (u32)src goto +offset base32 [RFC9669, Section 4.3 (Jump Instructions)] IETF
0x2f any 0 0x00 dst *= src divmul64 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0x30 0x0 0 any (deprecated, implementation-specific) packet [RFC9669, Section 5.5 (Legacy BPF Packet Access Instructions)] IETF
0x34 0x0 0 any dst = (u32)((imm != 0) ? ((u32)dst / (u32)imm) : 0) divmul32 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0x34 0x0 1 any dst = (u32)((imm != 0) ? ((s32)dst s/ imm) : 0) divmul32 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0x35 0x0 any any if dst >= imm goto +offset base64 [RFC9669, Section 4.3 (Jump Instructions)] IETF
0x36 0x0 any any if (u32)dst >= imm goto +offset base32 [RFC9669, Section 4.3 (Jump Instructions)] IETF
0x37 0x0 0 any dst = (imm != 0) ? (dst / (u32)imm) : 0 divmul64 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0x37 0x0 1 any dst = (imm != 0) ? (dst s/ imm) : 0 divmul64 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0x3c any 0 0x00 dst = (u32)((src != 0) ? ((u32)dst / (u32)src) : 0) divmul32 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0x3c any 1 0x00 dst = (u32)((src != 0) ? ((s32)dst s/(s32)src) : 0) divmul32 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0x3d any any 0x00 if dst >= src goto +offset base64 [RFC9669, Section 4.3 (Jump Instructions)] IETF
0x3e any any 0x00 if (u32)dst >= (u32)src goto +offset base32 [RFC9669, Section 4.3 (Jump Instructions)] IETF
0x3f any 0 0x00 dst = (src != 0) ? (dst / src) : 0 divmul64 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0x3f any 1 0x00 dst = (src != 0) ? (dst s/ src) : 0 divmul64 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0x40 any 0 any (deprecated, implementation-specific) packet [RFC9669, Section 5.5 (Legacy BPF Packet Access Instructions)] IETF
0x44 0x0 0 any dst = (u32)(dst | imm) base32 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0x45 0x0 any any if dst & imm goto +offset base64 [RFC9669, Section 4.3 (Jump Instructions)] IETF
0x46 0x0 any any if (u32)dst & imm goto +offset base32 [RFC9669, Section 4.3 (Jump Instructions)] IETF
0x47 0x0 0 any dst |= imm base64 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0x48 any 0 any (deprecated, implementation-specific) packet [RFC9669, Section 5.5 (Legacy BPF Packet Access Instructions)] IETF
0x4c any 0 0x00 dst = (u32)(dst | src) base32 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0x4d any any 0x00 if dst & src goto +offset base64 [RFC9669, Section 4.3 (Jump Instructions)] IETF
0x4e any any 0x00 if (u32)dst & (u32)src goto +offset base32 [RFC9669, Section 4.3 (Jump Instructions)] IETF
0x4f any 0 0x00 dst |= src base64 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0x50 any 0 any (deprecated, implementation-specific) packet [RFC9669, Section 5.5 (Legacy BPF Packet Access Instructions)] IETF
0x54 0x0 0 any dst = (u32)(dst & imm) base32 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0x55 0x0 any any if dst != imm goto +offset base64 [RFC9669, Section 4.3 (Jump Instructions)] IETF
0x56 0x0 any any if (u32)dst != imm goto +offset base32 [RFC9669, Section 4.3 (Jump Instructions)] IETF
0x57 0x0 0 any dst &= imm base64 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0x5c any 0 0x00 dst = (u32)(dst & src) base32 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0x5d any any 0x00 if dst != src goto +offset base64 [RFC9669, Section 4.3 (Jump Instructions)] IETF
0x5e any any 0x00 if (u32)dst != (u32)src goto +offset base32 [RFC9669, Section 4.3 (Jump Instructions)] IETF
0x5f any 0 0x00 dst &= src base64 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0x61 any any 0x00 dst = *(u32 *)(src + offset) base32 [RFC9669, Section 5 (Load and Store Instructions)] IETF
0x62 0x0 any any *(u32 *)(dst + offset) = imm base32 [RFC9669, Section 5 (Load and Store Instructions)] IETF
0x63 any any 0x00 *(u32 *)(dst + offset) = src base32 [RFC9669, Section 5 (Load and Store Instructions)] IETF
0x64 0x0 0 any dst = (u32)(dst << imm) base32 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0x65 0x0 any any if dst s> imm goto +offset base64 [RFC9669, Section 4.3 (Jump Instructions)] IETF
0x66 0x0 any any if (s32)dst s> (s32)imm goto +offset base32 [RFC9669, Section 4.3 (Jump Instructions)] IETF
0x67 0x0 0 any dst <<= imm base64 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0x69 any any 0x00 dst = *(u16 *)(src + offset) base32 [RFC9669, Section 5 (Load and Store Instructions)] IETF
0x6a 0x0 any any *(u16 *)(dst + offset) = imm base32 [RFC9669, Section 5 (Load and Store Instructions)] IETF
0x6b any any 0x00 *(u16 *)(dst + offset) = src base32 [RFC9669, Section 5 (Load and Store Instructions)] IETF
0x6c any 0 0x00 dst = (u32)(dst << src) base32 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0x6d any any 0x00 if dst s> src goto +offset base64 [RFC9669, Section 4.3 (Jump Instructions)] IETF
0x6e any any 0x00 if (s32)dst s> (s32)src goto +offset base32 [RFC9669, Section 4.3 (Jump Instructions)] IETF
0x6f any 0 0x00 dst <<= src base64 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0x71 any any 0x00 dst = *(u8 *)(src + offset) base32 [RFC9669, Section 5 (Load and Store Instructions)] IETF
0x72 0x0 any any *(u8 *)(dst + offset) = imm base32 [RFC9669, Section 5 (Load and Store Instructions)] IETF
0x73 any any 0x00 *(u8 *)(dst + offset) = src base32 [RFC9669, Section 5 (Load and Store Instructions)] IETF
0x74 0x0 0 any dst = (u32)(dst >> imm) base32 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0x75 0x0 any any if dst s>= imm goto +offset base64 [RFC9669, Section 4.3 (Jump Instructions)] IETF
0x76 0x0 any any if (s32)dst s>= (s32)imm goto +offset base32 [RFC9669, Section 4.3 (Jump Instructions)] IETF
0x77 0x0 0 any dst >>= imm base64 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0x79 any any 0x00 dst = *(u64 *)(src + offset) base64 [RFC9669, Section 5 (Load and Store Instructions)] IETF
0x7a 0x0 any any *(u64 *)(dst + offset) = imm base64 [RFC9669, Section 5 (Load and Store Instructions)] IETF
0x7b any any 0x00 *(u64 *)(dst + offset) = src base64 [RFC9669, Section 5 (Load and Store Instructions)] IETF
0x7c any 0 0x00 dst = (u32)(dst >> src) base32 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0x7d any any 0x00 if dst s>= src goto +offset base64 [RFC9669, Section 4.3 (Jump Instructions)] IETF
0x7e any any 0x00 if (s32)dst s>= (s32)src goto +offset base32 [RFC9669, Section 4.3 (Jump Instructions)] IETF
0x7f any 0 0x00 dst >>= src base64 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0x84 0x0 0 0x00 dst = (u32)-dst base32 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0x85 0x0 0 any call helper function by static ID base32 [RFC9669, Section 4.3.1 (Helper Functions)] IETF
0x85 0x1 0 any call PC += imm base32 [RFC9669, Section 4.3.2 (Program-local functions)] IETF
0x85 0x2 0 any call helper function by BTF ID base32 [RFC9669, Section 4.3.1 (Helper Functions)] IETF
0x87 0x0 0 0x00 dst = -dst base64 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0x94 0x0 0 any dst = (u32)((imm != 0)?((u32)dst % (u32)imm) : dst) divmul32 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0x94 0x0 1 any dst = (u32)((imm != 0) ? ((s32)dst s% imm) : dst) divmul32 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0x95 0x0 0 0x00 return base32 [RFC9669, Section 4.3 (Jump Instructions)] IETF
0x97 0x0 0 any dst = (imm != 0) ? (dst % (u32)imm) : dst divmul64 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0x97 0x0 1 any dst = (imm != 0) ? (dst s% imm) : dst divmul64 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0x9c any 0 0x00 dst = (u32)((src != 0)?((u32)dst % (u32)src) : dst) divmul32 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0x9c any 1 0x00 dst = (u32)((src != 0)?((s32)dst s% (s32)src) :dst) divmul32 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0x9f any 0 0x00 dst = (src != 0) ? (dst % src) : dst divmul64 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0x9f any 1 0x00 dst = (src != 0) ? (dst s% src) : dst divmul64 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0xa4 0x0 0 any dst = (u32)(dst ^ imm) base32 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0xa5 0x0 any any if dst < imm goto +offset base64 [RFC9669, Section 4.3 (Jump Instructions)] IETF
0xa6 0x0 any any if (u32)dst < imm goto +offset base32 [RFC9669, Section 4.3 (Jump Instructions)] IETF
0xa7 0x0 0 any dst ^= imm base64 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0xac any 0 0x00 dst = (u32)(dst ^ src) base32 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0xad any any 0x00 if dst < src goto +offset base64 [RFC9669, Section 4.3 (Jump Instructions)] IETF
0xae any any 0x00 if (u32)dst < (u32)src goto +offset base32 [RFC9669, Section 4.3 (Jump Instructions)] IETF
0xaf any 0 0x00 dst ^= src base64 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0xb4 0x0 0 any dst = (u32) imm base32 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0xb5 0x0 any any if dst <= imm goto +offset base64 [RFC9669, Section 4.3 (Jump Instructions)] IETF
0xb6 0x0 any any if (u32)dst <= imm goto +offset base32 [RFC9669, Section 4.3 (Jump Instructions)] IETF
0xb7 0x0 0 any dst = imm base64 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0xbc any 0 0x00 dst = (u32) src base32 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0xbc any 8 0x00 dst = (u32) (s32) (s8) src base32 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0xbc any 16 0x00 dst = (u32) (s32) (s16) src base32 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0xbd any any 0x00 if dst <= src goto +offset base64 [RFC9669, Section 4.3 (Jump Instructions)] IETF
0xbe any any 0x00 if (u32)dst <= (u32)src goto +offset base32 [RFC9669, Section 4.3 (Jump Instructions)] IETF
0xbf any 0 0x00 dst = src base64 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0xbf any 8 0x00 dst = (s64) (s8) src base64 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0xbf any 16 0x00 dst = (s64) (s16) src base64 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0xbf any 32 0x00 dst = (s64) (s32) src base64 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0xc3 any any 0x00 lock *(u32 *)(dst + offset) += src atomic32 [RFC9669, Section 5.3 (Atomic Operations)] IETF
0xc3 any any 0x01 src = atomic_fetch_add_32((u32 *)(dst + offset), src) atomic32 [RFC9669, Section 5.3 (Atomic Operations)] IETF
0xc3 any any 0x40 lock *(u32 *)(dst + offset) |= src atomic32 [RFC9669, Section 5.3 (Atomic Operations)] IETF
0xc3 any any 0x41 src = atomic_fetch_or_32((u32 *)(dst + offset), src) atomic32 [RFC9669, Section 5.3 (Atomic Operations)] IETF
0xc3 any any 0x50 lock *(u32 *)(dst + offset) &= src atomic32 [RFC9669, Section 5.3 (Atomic Operations)] IETF
0xc3 any any 0x51 src = atomic_fetch_and_32((u32 *)(dst + offset), src) atomic32 [RFC9669, Section 5.3 (Atomic Operations)] IETF
0xc3 any any 0xa0 lock *(u32 *)(dst + offset) ^= src atomic32 [RFC9669, Section 5.3 (Atomic Operations)] IETF
0xc3 any any 0xa1 src = atomic_fetch_xor_32((u32 *)(dst + offset), src) atomic32 [RFC9669, Section 5.3 (Atomic Operations)] IETF
0xc3 any any 0xe1 src = xchg_32((u32 *)(dst + offset), src) atomic32 [RFC9669, Section 5.3 (Atomic Operations)] IETF
0xc3 any any 0xf1 r0 = cmpxchg_32((u32 *)(dst + offset), r0, src) atomic32 [RFC9669, Section 5.3 (Atomic Operations)] IETF
0xc4 0x0 0 any dst = (u32)(dst s>> imm) base32 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0xc5 0x0 any any if dst s< imm goto +offset base64 [RFC9669, Section 4.3 (Jump Instructions)] IETF
0xc6 0x0 any any if (s32)dst s< (s32)imm goto +offset base32 [RFC9669, Section 4.3 (Jump Instructions)] IETF
0xc7 0x0 0 any dst s>>= imm base64 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0xcc any 0 0x00 dst = (u32)(dst s>> src) base32 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0xcd any any 0x00 if dst s< src goto +offset base64 [RFC9669, Section 4.3 (Jump Instructions)] IETF
0xce any any 0x00 if (s32)dst s< (s32)src goto +offset base32 [RFC9669, Section 4.3 (Jump Instructions)] IETF
0xcf any 0 0x00 dst s>>= src base64 [RFC9669, Section 4.1 (Arithmetic Instructions)] IETF
0xd4 0x0 0 0x10 dst = htole16(dst) base32 [RFC9669, Section 4.2 (Byte Swap Instructions)] IETF
0xd4 0x0 0 0x20 dst = htole32(dst) base32 [RFC9669, Section 4.2 (Byte Swap Instructions)] IETF
0xd4 0x0 0 0x40 dst = htole64(dst) base64 [RFC9669, Section 4.2 (Byte Swap Instructions)] IETF
0xd5 0x0 any any if dst s<= imm goto +offset base64 [RFC9669, Section 4.3 (Jump Instructions)] IETF
0xd6 0x0 any any if (s32)dst s<= (s32)imm goto +offset base32 [RFC9669, Section 4.3 (Jump Instructions)] IETF
0xd7 0x0 0 0x10 dst = bswap16(dst) base32 [RFC9669, Section 4.2 (Byte Swap Instructions)] IETF
0xd7 0x0 0 0x20 dst = bswap32(dst) base32 [RFC9669, Section 4.2 (Byte Swap Instructions)] IETF
0xd7 0x0 0 0x40 dst = bswap64(dst) base64 [RFC9669, Section 4.2 (Byte Swap Instructions)] IETF
0xdb any any 0x00 lock *(u64 *)(dst + offset) += src atomic64 [RFC9669, Section 5.3 (Atomic Operations)] IETF
0xdb any any 0x01 src = atomic_fetch_add_64((u64 *)(dst + offset), src) atomic64 [RFC9669, Section 5.3 (Atomic Operations)] IETF
0xdb any any 0x40 lock *(u64 *)(dst + offset) |= src atomic64 [RFC9669, Section 5.3 (Atomic Operations)] IETF
0xdb any any 0x41 src = atomic_fetch_or_64((u64 *)(dst + offset), src) atomic64 [RFC9669, Section 5.3 (Atomic Operations)] IETF
0xdb any any 0x50 lock *(u64 *)(dst + offset) &= src atomic64 [RFC9669, Section 5.3 (Atomic Operations)] IETF
0xdb any any 0x51 src = atomic_fetch_and_64((u64 *)(dst + offset), src) atomic64 [RFC9669, Section 5.3 (Atomic Operations)] IETF
0xdb any any 0xa0 lock *(u64 *)(dst + offset) ^= src atomic64 [RFC9669, Section 5.3 (Atomic Operations)] IETF
0xdb any any 0xa1 src = atomic_fetch_xor_64((u64 *)(dst + offset), src) atomic64 [RFC9669, Section 5.3 (Atomic Operations)] IETF
0xdb any any 0xe1 src = xchg_64((u64 *)(dst + offset), src) atomic64 [RFC9669, Section 5.3 (Atomic Operations)] IETF
0xdb any any 0xf1 r0 = cmpxchg_64((u64 *)(dst + offset), r0, src) atomic64 [RFC9669, Section 5.3 (Atomic Operations)] IETF
0xdc 0x0 0 0x10 dst = htobe16(dst) base32 [RFC9669, Section 4.2 (Byte Swap Instructions)] IETF
0xdc 0x0 0 0x20 dst = htobe32(dst) base32 [RFC9669, Section 4.2 (Byte Swap Instructions)] IETF
0xdc 0x0 0 0x40 dst = htobe64(dst) base64 [RFC9669, Section 4.2 (Byte Swap Instructions)] IETF
0xdd any any 0x00 if dst s<= src goto +offset base64 [RFC9669, Section 4.3 (Jump Instructions)] IETF
0xde any any 0x00 if (s32)dst s<= (s32)src goto +offset base32 [RFC9669, Section 4.3 (Jump Instructions)] IETF