B2.49 ESR_EL2, Exception Syndrome Register, EL2

The ESR_EL2 holds syndrome information for an exception taken to EL2.

Bit field descriptions

ESR_EL2 is a 32-bit register, and is part of:

  • The Virtualization registers functional group.
  • The Exception and fault handling registers functional group.
Figure B2-36 ESR_EL2 bit assignments
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EC, [31:26]
Exception Class. Indicates the reason for the exception that this register holds information about. See the Arm® Architecture Reference Manual Armv8, for Armv8-A architecture profile for more information.
IL, [25]

Instruction Length for synchronous exceptions. The possible values are:

0 16-bit.
1 32-bit.

See the Arm® Architecture Reference Manual Armv8, for Armv8-A architecture profile for more information.

ISS, [24:0]

Syndrome information. See the Arm® Architecture Reference Manual Armv8, for Armv8-A architecture profile for more information.

When reporting a virtual SEI, bits[24:0] take the value of VSESRL_EL2[24:0].

When reporting a physical SEI, the following occurs:

  • IDS==0 (architectural syndrome).
  • AET always reports an uncontainable error (UC) with value 0b000 or an unrecoverable error (UEU) with value 0b001.
  • EA is RES0.

When reporting a synchronous Data Abort, EA is RES0.

See B2.103 VSESR_EL2, Virtual SError Exception Syndrome Register.

Configurations

RW fields in this register reset to architecturally UNKNOWN values.

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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