Sun Microelectronics
308
UltraSPARC User’s Manual
A.6.4.1 Virtual Address Data Watchpoint Enable
VR, VW: LSU.virtual_address_data_watchpoint_enable. If VR/VW is set, a data
read/write that matches the (range of) addresses in the virtual
watchpoint register cause a watchpoint trap. Both VR and VW may be set
to place a watchpoint for either a read or write access.
A.6.4.2 Virtual Address Data Watchpoint Byte Mask
VM<7:0> LSU.virtual_address_data_watchpoint_mask. The
virtual_address_data_watch_point_register contains the virtual address
of a 64-bit word to be watched. The 8-bit
virtual_address_data_watch_point_mask controls which byte(s) within
the 64-bit word should be watched. If all 8 bits are cleared, the virtual
watchpoint is disabled. If watchpoint is enabled and a data reference
overlaps any of the watched bytes in the watchpoint mask, a virtual
watchpoint trap is generated.
A.6.4.3 Physical Address Data Watchpoint Enable
PR, PW: LSU.physical_address_data_watchpoint_enable. If PR/PW is set, a data
read/write that matches the (range of) addresses in the physical
watchpoint register causes a watchpoint trap. Both PR and PW may be
set to place a watchpoint on either a read or write access.
A.6.4.4 Physical Address Data Watchpoint Byte Mask
PM<7:0>: LSU.physical_address_data_watchpoint_mask. The
physical_address_data_watch_point_register contains the physical
address of a 64-bit word to be watched. The 8-bit
physical_address_data_watch_point_mask controls which byte(s) within
the 64-bit word should be watched. If all 8 bits are cleared, the physical
Table A-3 LSU Control Register: VA/PA Data Watchpoint Byte Mask Examples
Watchpoint
Mask
Addr of Bytes Watched
7654 3210
00
16
Watchpoint disabled
01
16
0000 0001
32
16
0011 0010
FF
16
1111 1111
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