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CABSAD$, CRELAD$–Addressing Routines
Parameters
t
See 6.1.
CRELAD$
CRELAD$ is the function code that determines which of the absolute addressing
routines is called by C$RELAD. It must be enclosed by apostrophes.
abs-addr
Absolute address that is to be converted to a relative address.
If this parameter is omitted, then the routine uses the value in register A0 for
abs-addr.
pkt-addr
See 6.1
Normal Return
If CRELAD$ returns normally, registers A2 and A3 contain an element name that is
left-justified and space-filled. The relative address values corresponding to the input
absolute address are in two registers: register A1 contains a location counter number,
and register A0 contains an address relative to that location counter.
If the input value in register A0 is not in the range of the program, then register A0 is
unchanged, register A1 is set to zero, the register pair A2, A3 is filled with the Fieldata
characters "*ABSOLUTE*", and the normal return is taken. This case also occurs if the
collection of the absolute is done with the Z option on the call to the Collector. When
the Z option is used on the Collector call, the diagnostic tables are not included in the
absolute element produced, and relative addresses cannot be computed.
On normal return, registers A4 and A5 contain the location counter limits or zeros if the
address was absolute. Register A4 equals the location counter lower limit - 1, and A5
equals the location counter upper limit. The following instruction skips the instruction
immediately after it if x contains an address in the same element and location counter
range as the address on the call to CRELAD$ that computed A4 and A5.
TW A4,x
The calling program can save the computation by calling CRELAD$ using registers A1,
A2, and A3 and computing A0 = x-(A4+1).
The routine must be part of the main segment. Only one activity can use CRELAD$ at
one time.
If more than one element in different segments has addresses corresponding to the
given absolute address, the one in main storage is used. If there is no element in main
storage, an error condition exists.
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