The Breakpoint Value Registers (BVRs)
are registers 64-68, at offsets
Each BVR is associated with a Breakpoint Control Register (BCR),
BVR0 with BCR0
BVR1 with BCR1.
This pattern continues up to BVR5 with BCR5.
A pair of breakpoint registers, BVRn and BCRn, is called a Breakpoint Register Pair (BRPn).
Table 10.2 shows the BVRs and corresponding BCRs.
|Breakpoint Value Registers||Breakpoint Control Registers|
|Register number||Offset||Name||Register number||Offset||Name|
The breakpoint value contained in this register corresponds to either an Instruction Virtual Address (IVA) or a context ID. Breakpoints can be set on:
a context ID value
an IVA and context ID pair.
For an IVA and context ID pair, two BRPs must be linked. A debug event is generated when both the IVA and the context ID pair match at the same time.
Table 10.3 shows how the bit values correspond with the Breakpoint Value Registers functions.
Breakpoint value. The reset value is 0.
Only BRP4 and BRP5 support context ID comparison.
BVR0[1:0], BVR1[1:0], BVR2[1:0], and BVR3[1:0] are Should Be Zero or Preserved on writes and Read As Zero on reads because these registers do not support context ID comparisons.
The context ID value for a BVR to match with is given by the contents of the CP15 Context ID Register.