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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.

This is an alias of SYS. This means:

  • The encodings in this description are named to match the encodings of SYS.
  • The description of SYS gives the operational pseudocode for this instruction.

System
(Armv8.5)

313029282726252423222120191817161514131211109876543210
110101010000101101110011100Rt
Lop1CRnCRmop2

System

CFP RCTX, <Xt>

is equivalent to

SYS #3, C8, 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.

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