SuperH (SH) 64-bit RISC Series SH-5 System Architecture, Volume ...

PRELIMINARY DATA
WP channel matching 71
When none of the matching channels have ACTION_EXCEPTION programmed in their
action registers, the effect is to logically ‘OR’ together the actions across all the
matching channels. Thus, if 2 channels both specify the same performance counter
decrement, that performance counter will still only be decremented by 1 per
matching instruction.
When one or more of the matching channels have ACTION_EXCEPTION programmed
in their action registers, the behavior is as follows. The following WPC and DM
actions are suppressed, regardless of which matching channel (excepting or
non-excepting) requests them:
• set or clear WPC or DM generic chain latch,
• increment WPC performance counter,
• reset WPC performance counters,
• trace generation,
• raise debug interrupt,
• trigger out message generation.
If some matching channels specify ACTION_ECOUNT in their action registers,
whether or not a particular WPC event counter is decremented is determined by
whether the following conditions hold:
• there must be at least one matching channel with ACTION_EXCEPTION and
ACTION_ECOUNT set, with ECOUNT_ID referring to the particular event counter
AND
• at least one such channel must be of the type corresponding to the debug
exception that is actually launched.
For example,
• if DEBUGIA is launched, only matching IA channels with both ACTION_EXCEPTION
and ACTION_ECOUNT set can cause a WPC event counter to be decremented.
Matching IV and OA channels have their ACTION_ECOUNT settings ignored.
D R A FT
When a SHcompact mode instruction hits multiple WPC channels, there may be
some divergence from the above description, depending on the particular
SHcompact instruction involved. In particular, non-exception actions programmed
on a matching IA channel may occur even when a DEBUGOA exception is launched
from a matching OA channel.
05-SA-10003 v1.0
SuperH, Inc.
SH-5 System Architecture, Volume 3: Debug