ESR_EL1, Exception Syndrome Register (EL1)

The ESR_EL1 characteristics are:

Purpose

Holds syndrome information for an exception taken to EL1.

This register is part of the Exception and fault handling registers functional group.

Configuration

AArch64 System register ESR_EL1 is architecturally mapped to AArch32 System register DFSR.

RW fields in this register reset to architecturally UNKNOWN values.

Attributes

ESR_EL1 is a 32-bit register.

Field descriptions

See ESR_ELx.

Accessing the ESR_EL1

This register can be read using MRS with the following syntax:

MRS <Xt>, <systemreg>

This register can be written using MSR (register) with the following syntax:

MSR <systemreg>, <Xt>

This syntax uses the following encoding in the System instruction encoding space:

<systemreg> op0op1CRnCRmop2
ESR_EL11100001010010000
ESR_EL121110101010010000

Accessibility

The register is accessible as follows:

<systemreg> Control Accessibility
E2HTGENSEL0EL1EL2EL3
ESR_EL1xx0 - RW n/a RW
ESR_EL1001 - RWRWRW
ESR_EL1011 - n/a RWRW
ESR_EL1101 - RW ESR_EL2 RW
ESR_EL1111 - n/a ESR_EL2 RW
ESR_EL12xx0 - - n/a -
ESR_EL12001 - - - -
ESR_EL12011 - n/a - -
ESR_EL12101 - - RWRW
ESR_EL12111 - n/a RWRW

When HCR_EL2.E2H is 1, without explicit synchronization, access from EL3 using the mnemonic ESR_EL1 or ESR_EL12 are not guaranteed to be ordered with respect to accesses using the other mnemonic.

Traps and enables

For a description of the prioritization of any generated exceptions, see section D1.13.2 (Synchronous exception prioritization) in the ARM® Architecture Reference Manual, ARMv8, for ARMv8-A architecture profile. Subject to the prioritization rules, the following traps and enables are applicable when accessing this register.

When EL2 is implemented and is using AArch64 and SCR_EL3.NS==1 && HCR_EL2.E2H==0 :

When EL2 is implemented and is using AArch64 and SCR_EL3.NS==1 && HCR_EL2.E2H==1 && HCR_EL2.TGE==0 :




28/09/2017 08:24

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