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EDWAR, External Debug Watchpoint Address Register

The EDWAR characteristics are:

Purpose

Returns the virtual data address being accessed when a Watchpoint Debug Event was triggered.

Configuration

EDWAR is in the Core power domain.

Attributes

EDWAR is a 64-bit register.

Field descriptions

The EDWAR bit assignments are:

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
Watchpoint address
Watchpoint address
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

Bits [63:0]

Watchpoint address. The data virtual address being accessed when a Watchpoint Debug Event was triggered and caused entry to Debug state. This address must be within a naturally-aligned block of memory of power-of-two size no larger than the DC ZVA block size.

The value of this register is UNKNOWN if the PE is in Non-debug state, or if Debug state was entered other than for a Watchpoint debug event.

The value of EDWAR[63:32] is UNKNOWN if Debug state was entered for a Watchpoint debug event taken from AArch32 state.

The EDWAR is subject to the same alignment rules as the reporting of a watchpointed address in the FAR. See 'Determining the memory location that caused a Watchpoint exception'.

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

Accessing the EDWAR

EDWAR can be accessed through the external debug interface:

Component	Offset	Instance	Range
Debug	0x030	EDWAR	31:0

This interface is accessible as follows:

When IsCorePowered(), !DoubleLockStatus() and !OSLockStatus() accesses to this register are RO.
Otherwise accesses to this register generate an error response.

Component	Offset	Instance	Range
Debug	0x034	EDWAR	63:32