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CFP

Control Flow Prediction Restriction by Context prevents control flow predictions that predict execution addresses, based on information gathered from earlier execution within a particular execution context, from allowing later speculative execution within that context to be observable through side-channels.

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

Control Flow Prediction Restriction by Context prevents control flow predictions that predict execution addresses, based on information gathered from earlier execution within a particular execution context, from allowing later speculative execution within that context to be observable through side-channels.

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

This is an alias of SYS. This means:

System
(Armv8.5)

System
(Armv8.5)

313029282726252423222120191817161514131211109876543210
110101010000101101110011100Rt
Lop1CRnCRmop2

CFP RCTX, <Xt>

is equivalent to

SYS #3, C7, C3, #4, <Xt>

and is always the preferred disassembly.

Assembler Symbols

<Xt>

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

Operation

The description of SYS gives the operational pseudocode for this instruction.


Internal version only: isa v32.12v32.06, AdvSIMD v29.04, pseudocode v2020-09_xmlv2020-06_rel, sve v2020-09_rc3v2020-06_rel0 ; Build timestamp: 2020-11-18T172020-07-03T12:2342

Copyright © 2010-2020 Arm Limited or its affiliates. All rights reserved. This document is Non-Confidential.

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