Rev. 5.00, 09/03, page 173 of 760
7.3.6 PC Trace
1. Setting PCTE in BRCR to 1 enables PC traces. When branch (branch instruction, repeat, and
interrupt) is generated, the address from which the branch sourc e address can be calculated and
the branch destination addres s are st ored in BRSR and BRDR, respectively. The branch
address and the pointer, which corresponds to the branch, are included in BRSR.
2. The branch address before branch occurs can be calcu lated from the address and the p ointer
stored in BRSR. The expression from BSA (the address in BRSR), PID (the po inter in BRSR),
and IA (the instruction address before branch occurs) is as follows: IA = BSA – 2 * PID.
Note s are nee ded when an interrupt ( a branch) is is sued before the branch destination
instruction is executed. In case of the next figure, the instruction “Exec” executed immediately
before branch is calculated by IA = BSA – 2 * PID. However, when branch “branch” has delay
slot and the destination address is 4n + 2 address, the address “Dest” which is specified by
branch instruction is stored in BRSR (Dest = BSA). Therefore, as IA = BSA – 2 * PID is not
applied to this case, this PID is invalid. The case where BSA is 4n + 2 boundary is applied
only to this case and then some cases are classified as follows:
Exec:branch Dest
Dest:instr (not executed)
interrupt
Int: interrupt routine
If the PID value is odd, instruction buffer indicates PID+2 buffer. However, these expressions
in this table are accounted for it. Therefore, the true branch source address is calculated with
BSA and PID values stored in BRSR.
3. The branch address before branch occurrence, IA, has different values due to some kinds of
branch.
a. Branch instru ction
The branch instruction addres s
b. Interrupt
The last instruction executed before interrupt
The top address of interrupt routi ne is stored in BRDR.
4. BRSR and BRDR have eight pai rs of queu e st ructu r es. The top of queues is rea d fir st when th e
address stored in the PC trace register is read. BRSR and BRDR share the read pointer. Read
BRSR and BRDR in order, the queue only shifts after BRDR is read. When reading BRDR,
longword access should be used. Also, the PC trace has a trace pointer, which initially points
to the bottom of the queues. The first pair of branch addresses will be stored at the bottom of
the queues, then push up when next pairs come into the queues. The trace pointer will points to
the next branch address to be executed, unless it got push out of the queues. When the branch
address has been executed, the trace pointer will shift down to next pair of addresses, until it