16.68 DCPS2

Debug Change PE State to EL2.

Syntax

DCPS2 {#imm}

Where:

imm
Is an optional 16-bit unsigned immediate, in the range 0 to 65535, defaulting to 0.

Usage

Debug Change PE State to EL2, when executed in Debug state:

  • If executed at EL0 or EL1 changes the current Exception level and SP to EL2 using SP_EL2.
  • Otherwise, if executed at ELx, selects SP_ELx.

The target exception level of a DCPS2 instruction is:

  • EL2 if the instruction is executed at an exception level that is not EL3.
  • EL3 if the instruction is executed at EL3.

When the target Exception level of a DCPS2 instruction is ELx, on executing this instruction:

  • ELR_ELx becomes unknown.
  • SPSR_ELx becomes unknown.
  • ESR_ELx becomes unknown.
  • DLR_EL0 and DSPSR_EL0 become unknown.
  • The endianness is set according to SCTLR_ELx.EE.

This instruction is undefined at the following exception levels:

  • All exception levels if EL2 is not implemented.
  • At EL0 and EL1 in Secure state if EL2 is implemented.

This instruction is always undefined in Non-debug state.

For more information on the operation of the DCPSn instructions, see DCPS in the ARM Architecture Reference Manual ARMv8, for ARMv8-A architecture profile.

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