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ARM DDI 0363E Copyright © 2009 ARM Limited. All rights reserved. 11-23
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11.4.12 Breakpoint Value Registers
Each BVR is associated with a Breakpoint Control Register (BCR). BCRy is the corresponding
control register for BVRy.
A pair of breakpoint registers, BVRy/BCRy, is called a Breakpoint Register Pair (BRP).
BVR0-7 are paired with BCR0-7 to make BRP0-7.
The breakpoint value contained in this register corresponds to either an instruction address or a
context ID. Breakpoints can be set on:
• an instruction address
• a context ID value
• an instruction address and context ID pair.
For an instruction address and context ID pair, two BRPs must be linked. A debug event is
generated when both the instruction address and the context ID pair match at the same time.
Table 11-16 shows how the bit values correspond with the Breakpoint Value Registers
functions.
Note
• Only BRPn supports context ID comparison, where n+1 is the number of breakpoint
register pairs implemented in the processor.
• Bits [1:0] of Registers BVR0 to BVR(n-1) are Do Not Modify on writes and
Read-As-Zero because these registers do not support context ID comparisons.
• The contents of the CP15 Context ID Register give the context ID value for a BVR to
match. For information on the Context ID Register, see Chapter 4 System Control
Coprocessor.
11.4.13 Breakpoint Control Registers
The BCR is a read/write register that contains the necessary control bits for setting:
• breakpoints
• linked breakpoints.
Figure 11-10 shows the bit arrangement of the BCRs.
Figure 11-10 Breakpoint Control Registers format
Table 11-16 Breakpoint Value Registers functions
Bits Reset value Description
[31:0]
0x0
Breakpoint value
Reserved
M Linked BRP Reserved
Byte
address
select
Secure state access control
Breakpoint
address mask
Reserved
Reserved
B
31 29 28 24 23 22 20 19 16 15 14 13 9 8 5 4 3 2 1 0
S