10.3.2. Breakpoint Value Registers

The Breakpoint Value Registers (BVRs) are registers 64-68, at offsets 0x100-0x114. Each BVR is associated with a Breakpoint Control Register (BCR), for example:

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.

Table 10.2. BVRs and corresponding BCRs

Breakpoint Value RegistersBreakpoint Control Registers
RegisterRegister numberOffsetRegisterRegister numberOffset
BVR0640x100BCR0800x140
BVR1650x104BCR1810x144
BVR2660x108BCR2820x148
BVR3660x10CBCR3830x14C
BVR4670x110BCR4840x150
BVR5680x114BCR5850x154

The breakpoint value contained in this register corresponds to either an Instruction Virtual Address (IVA) or a context ID. Breakpoints can be set on:

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.

Table 10.3. Breakpoint Value Registers bit functions

BitsNameDescription

[31:0]

-

Breakpoint value. The reset value is 0.


Note

  • 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.

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