Profileme Pc Register - Pmpc; Exception Address Register - Exc_Addr; Profileme Pc Register; Exception Address Register - Compaq 21264 Hardware Reference Manual

Ibox IPRs
5.2.6 ProfileMe PC Register – PMPC
The ProfileMe PC register (PMPC) is a read-only register that contains the PC of the
last profiled instruction. Additional information is available in the I_STAT and
PCTR_CTL register descriptions.
Usage of PMPC in performance monitoring is described in Section 6.10.
Figure 5–11 shows the ProfileMe PC register.
Figure 5–11 ProfileMe PC Register
63
PC[63:2]
PAL
Table 5–4 describes the ProfileMe PC register fields.
Table 5–4 ProfileMe PC Fields Description
Name
PC[63:2]
Reserved
PAL
5.2.7 Exception Address Register – EXC_ADDR
The exception address register (EXC_ADDR) is a read-only register that is updated by
hardware when it encounters an exception or interrupt.
EXC_ADDR[0] is set if the associated exception occurred in PALmode. The exception
actions are listed here:
•
If the exception was a fault or a synchronous trap, EXC_ADDR contains the PC of
the instruction that triggered the fault or trap.
•
If the exception was an interrupt, EXC_ADDR contains the PC of the next instruc-
tion that would have executed if the interrupt had not occurred.
Figure 5–12 shows the exception address register.
Figure 5–12 Exception Address Register
63
PC[63:2]
PAL
Internal Processor Registers
5–8
Extent Type Description
[63:2] RO Address of the profiled instruction
[1] RO Read as zero
[0] RO Indicates that the PC field contains a physical-mode PALmode
address
Alpha 21264/EV67 Hardware Reference Manual
2 1 0
LK99-0018A
2 1 0
LK99-0018A