B1.10 AIFSR, Auxiliary Instruction Fault Status Register

The AIFSR provides extra IMPLEMENTATION DEFINED fault status information for Prefetch Abort exceptions that are taken to EL1 modes. This register is not used in the Cortex®-A55 core.

Bit field descriptions

AIFSR is a 32-bit register, and is part of:

  • The Exception and fault handling registers functional group.
  • The Implementation defined functional group.
Figure B1-6 AIFSR bit assignments
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RES0, [31:0]

AArch32 System register AIFSR is architecturally mapped to AArch64 System register AFSR1_EL1. See B2.11 AFSR1_EL1, Auxiliary Fault Status Register 1, EL1.

AArch32 System register AIFSR(S) is architecturally mapped to AArch64 System register AFSR1_EL3. See B2.13 AFSR1_EL3, Auxiliary Fault Status Register 1, EL3.

Bit fields and details not provided in this description are architecturally defined. See the Arm® Architecture Reference Manual Armv8, for Armv8-A architecture profile.

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