VBAR_EL3 | Jon's Arm Reference

This register is present only when EL3 is implemented. Otherwise, direct accesses to VBAR_EL3 are UNDEFINED.

Attributes

Field descriptions

Bits [63:11]

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

Note

If the implementation supports FEAT_LVA3, then:

If tagged addresses are not being used, bits [63:56] of VBAR_EL3 must be 0 or else the use of the vector address will result in a recursive exception.

Otherwise:

If the implementation supports FEAT_LVA, then:

If tagged addresses are being used, bits [55:52] 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 [63:52] of VBAR_EL3 must be 0 or else the use of the vector address will result in a recursive exception.

If the implementation does not support FEAT_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.

The reset behavior of this field is:

On a Warm reset, this field resets to an architecturally UNKNOWN value.

Bits [10:0]

Accessing VBAR_EL3

Accesses to this register use the following encodings in the System register encoding space:

MRS <Xt>, VBAR_EL3

op0	op1	CRn	CRm	op2
0b11	0b110	0b1100	0b0000	0b000

if PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then UNDEFINED; elsif PSTATE.EL == EL2 then UNDEFINED; elsif PSTATE.EL == EL3 then X[t, 64] = VBAR_EL3;

MSR VBAR_EL3, <Xt>

op0	op1	CRn	CRm	op2
0b11	0b110	0b1100	0b0000	0b000

if PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then UNDEFINED; elsif PSTATE.EL == EL2 then UNDEFINED; elsif PSTATE.EL == EL3 then if IsFeatureImplemented(FEAT_FGWTE3) && FGWTE3_EL3.VBAR_EL3 == '1' then AArch64.SystemAccessTrap(EL3, 0x18); else VBAR_EL3 = X[t, 64];

63	62	61	60	59	58	57	56	55	54	53	52	51	50	49	48	47	46	45	44	43	42	41	40	39	38	37	36	35	34	33	32
31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
Vector Base Address
Vector Base Address																					RES0

VBAR_EL3: Vector Base Address Register (EL3)

Purpose

Configuration

Attributes

Field descriptions

Bits [63:11]

Bits [10:0]

Accessing VBAR_EL3