Arm® A64 Instruction Set Architecture: Armv8, for Armv8-A architecture profile

PACGA

Pointer Authentication Code, using Generic key. This instruction computes the pointer authentication code for an address in the first source register, using a modifier in the second source register, and the Generic key. The computed pointer authentication code is returned in the upper 32 bits of the destination register.

Integer
(Armv8.3)

boolean source_is_sp = FALSE;
integer d = UInt(Rd);
integer n = UInt(Rn);
integer m = UInt(Rm);

if !HavePACExt() then
    UNDEFINED;

if m == 31 then source_is_sp = TRUE;

Assembler Symbols

if source_is_sp then
    X[d] = AddPACGA(X[n], SP[]);
else
    X[d] = AddPACGA(X[n], X[m]);