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VBAR_EL3, Vector Base Address Register (EL3)

The VBAR_EL3 characteristics are:

Purpose

Holds the vector base address for any exception that is taken to EL3.

Configuration

RW fields in this register reset to architecturally UNKNOWN values.

Attributes

VBAR_EL3 is a 64-bit register.

Field descriptions

The VBAR_EL3 bit assignments are:

6362616059585756555453525150494847464544434241403938373635343332
Vector Base Address
Vector Base Address00000000000
313029282726252423222120191817161514131211109876543210

Bits [63:11]

Vector Base Address. Base address of the exception vectors for exceptions taken to EL3.

If the implementation does not support ARMv8.2-LVA, then:

  • If tagged addresses are being used, bits [55:48] of VBAR_EL3 must be 0 or else the use of the vector address will result in a recursive exception.
  • If tagged addresses are not being used, bits [63:48] of VBAR_EL3 must be 0 or else the use of the vector address will result in a recursive exception.

If the implementation supports ARMv8.2-LVA, then:

  • If tagged addresses are being used, bits [55:52] of VBAR_EL3 must be the same or else the use of the vector address will result in a recursive exception.
  • If tagged addresses are not being used, bits [63:52] of VBAR_EL3 must be the same or else the use of the vector address will result in a recursive exception.

This field resets to an architecturally UNKNOWN value.

Bits [10:0]

Reserved, RES0.

Accessing the VBAR_EL3

Accesses to this register use the following encodings:

MRS <Xt>, VBAR_EL3

op0CRnop1op2CRm
0b110b11000b1100b0000b0000
if PSTATE.EL == EL0 then
    UNDEFINED;
elsif PSTATE.EL == EL1 then
    UNDEFINED;
elsif PSTATE.EL == EL2 then
    UNDEFINED;
elsif PSTATE.EL == EL3 then
    return VBAR_EL3;
              

MSR VBAR_EL3, <Xt>

op0CRnop1op2CRm
0b110b11000b1100b0000b0000
if PSTATE.EL == EL0 then
    UNDEFINED;
elsif PSTATE.EL == EL1 then
    UNDEFINED;
elsif PSTATE.EL == EL2 then
    UNDEFINED;
elsif PSTATE.EL == EL3 then
    VBAR_EL3 = X[t];
              


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