CFP

Control flow prediction restriction by context

This instruction prevents control flow predictions that predict execution addresses based on information gathered from earlier execution within a particular execution context. Control flow predictions determined by the actions of code in the target execution context or contexts appearing in program order before the instruction cannot be used to exploitatively control speculative execution occurring after the instruction is complete and synchronized.

For more information, see CFP RCTX, Control Flow Prediction Restriction by Context.

Encoding: System

Variants: FEAT_SPECRES (PROFILE_R)

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	0	1	0	1	0	0	0	0	1	0	1	1	0	1	1	1	0	0	1	1	1	0	0
										L			op1			CRn				CRm				op2			Rt

CFP RCTX, <Xt>

Equivalent to: SYS #3, C7, C3, #4, <Xt>

Explanations

<Xt>: Is the 64-bit name of the general-purpose source register, encoded in the "Rt" field.