PACIB, PACIB1716, PACIBSP, PACIBZ, PACIZB

Pointer Authentication Code for Instruction address, using key B. This instruction computes and inserts a pointer authentication code for an instruction address, using a modifier and key B.

The address is:

The modifier is:

It has encodings from 2 classes: Integer and System

Integer
(Armv8.3)

313029282726252423222120191817161514131211109876543210
110110101100000100Z001RnRd

PACIB (Z == 0)

PACIB <Xd>, <Xn|SP>

PACIZB (Z == 1 && Rn == 11111)

PACIZB <Xd>

boolean source_is_sp = FALSE; integer d = UInt(Rd); integer n = UInt(Rn); if !HavePACExt() then UNDEFINED; if Z == '0' then // PACIB if n == 31 then source_is_sp = TRUE; else // PACIZB if n != 31 then UNDEFINED;

System
(Armv8.3)

313029282726252423222120191817161514131211109876543210
1101010100000011001000x101x11111
CRmop2

PACIB1716 (CRm == 0001 && op2 == 010)

PACIB1716

PACIBSP (CRm == 0011 && op2 == 011)

PACIBSP

PACIBZ (CRm == 0011 && op2 == 010)

PACIBZ

integer d; integer n; boolean source_is_sp = FALSE; case CRm:op2 of when '0011 010' // PACIBZ d = 30; n = 31; when '0011 011' // PACIBSP d = 30; source_is_sp = TRUE; if HaveBTIExt() then // Check for branch target compatibility between PSTATE.BTYPE // and implicit branch target of PACIBSP instruction. BTypeCompatible = BTypeCompatible_PACIXSP(); when '0001 010' // PACIB1716 d = 17; n = 16; when '0001 000' SEE "PACIA"; when '0001 100' SEE "AUTIA"; when '0001 110' SEE "AUTIB"; when '0011 00x' SEE "PACIA"; when '0011 10x' SEE "AUTIA"; when '0011 11x' SEE "AUTIB"; when '0000 111' SEE "XPACLRI";

Assembler Symbols

<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.

Operation

if HavePACExt() then if source_is_sp then X[d] = AddPACIB(X[d], SP[]); else X[d] = AddPACIB(X[d], X[n]);


Internal version only: isa v30.44, AdvSIMD v27.08, pseudocode v8.5-2019-06_rc2-5-g22901f2, sve v2019-06_rc4 ; Build timestamp: 2019-06-26T22:04

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