COSP

Clear other speculative prediction restriction by context

This instruction prevents predictions, other than Cache prefetch, Control flow, and Data Value predictions, that predict execution addresses based on information gathered from earlier execution within a particular execution context. Predictions, other than Cache prefetch, Control flow, and Data Value predictions, determined by the actions of code in the target execution context or contexts appearing in program order before the instruction cannot exploitatively control any speculative access occurring after the instruction is complete and synchronized.

Encoding: System

Variants: FEAT_SPECRES2 (ARMv8.9)

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	1	0
										L			op1			CRn				CRm				op2			Rt

COSP RCTX, <Xt>

Equivalent to: SYS #3, C7, C3, #6, <Xt>

Explanations

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