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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)

313029282726252423222120191817161514131211109876543210
10011010110Rm001100RnRd

PACGA <Xd>, <Xn>, <Xm|SP>

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

<Xd>

Is the 64-bit name of the general-purpose destination register, encoded in the "Rd" field.

<Xn>

Is the 64-bit name of the first general-purpose source register, encoded in the "Rn" field.

<Xm|SP>

Is the 64-bit name of the second general-purpose source register or stack pointer, encoded in the "Rm" field.

Operation

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