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CABSAD$, CRELAD$–Addressing Routines
Error Return
The error return is taken if an I/O status other than 0 or 5 is encountered. In that case,
register A0 contains the status code, register A1 contains the error address on mass
storage, A2 through A3 contain the Fieldata characters "INPUT ERROR", and A4 through
A5 contain zero.
Reinitializing CRELAD$
If a program using CRELAD$ is checkpointed and restarted, CRELAD$ must be
reinitialized. Use the following instruction in the restart contingency code when calling
the relocatable version.
SZ *CRELAD$-1
When calling the common bank version, store zero into the first word of the 300-word
buffer.
SZ buffer-name
The alternate relocatable calling sequence is
L A0,(bdi,addr)
LMJ X11,CRELAD$
error return
normal return
The alternate common bank calling sequence is
L A0,(bdi,addr)
L,U A5,300-word-buffer-starting-address
I$BJ X11,CB$CRELAD$
error return
normal return
This entry and the previous example provide the same results. The only difference is
that a bank descriptor index is specified in H1 of A0. This is necessary if the address in
H2 of register A0 is in an unbased bank or a bank that overlaps the bank containing
CRELAD$ (usually the control bank) and the address is in the overlap area. Otherwise,
when CRELAD$ performs an ER BANK$ to determine the bank descriptor index for the
address, it obtains the wrong BDI because the CRELAD$ bank descriptor register is then
active.
7833 1733–004 6–11