EDWAR

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

Configuration

The value of this register is UNKNOWN if the PE is in Non-debug state, or if EDSCR.STATUS is not 0b101011.

Attributes

Field descriptions

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.

When the PE sets EDHSR.{FnP, FnV} to {0,1} on taking a Watchpoint exception, the PE sets EDWAR to any address within the naturally-aligned fault granule that contains the virtual address of the memory access that generated the Watchpoint exception.

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'.

The reset behavior of this field is:

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

Accessing EDWAR

EDWAR can be accessed through the external debug interface:

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
Watchpoint address
Watchpoint address