Pointer Authentication Code for data address, using key B
This instruction calculates and inserts a Pointer Authentication Code for a data address, using a modifier and key B.
The address is in the general-purpose register that is specified by <Xd>.
The modifier is:
| 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| 1 | 1 | 0 | 1 | 1 | 0 | 1 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | Z | 0 | 1 | 1 | Rn | Rd | ||||||||
| sf | S | opcode2 | |||||||||||||||||||||||||||||
if !IsFeatureImplemented(FEAT_PAuth) then EndOfDecode(Decode_UNDEF); end; var source_is_sp : boolean = FALSE; let d : integer = UInt(Rd); let n : integer = UInt(Rn); if Z == '0' then // PACDB if n == 31 then source_is_sp = TRUE; end; else // PACDZB if n != 31 then EndOfDecode(Decode_UNDEF); end; end;
| <Xd> |
Is the 64-bit name of the general-purpose destination register, encoded in the "Rd" field. |
| <Xn|SP> |
Is the 64-bit name of the general-purpose source register or stack pointer, encoded in the "Rn" field. |
if source_is_sp then X{64}(d) = AddPACDB(X{64}(d), SP{64}()); else X{64}(d) = AddPACDB(X{64}(d), X{64}(n)); end;
2026-03_rel 2026-03-26 20:48:11
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