Chapter 20. ESA/390 Dependent Features

125

is specified, then the subsequent

.ltorg

must be put in the same section; otherwise an error will

result.

Thus, for example, the following code uses

r3

to address branch targets and

r4

to address

the literal pool, which has been written to the

.data

section. The is, the constants

=A(some_routine)

,

=H'42'

and

=E'3.1416'

will all appear in the

.data

section.

.data

.using

LITPOOL,r4

.text

BASR r3,0

.using *,r3

B

START

.long LITPOOL

START:

L r4,4(,r3)

L r15,=A(some_routine)

LTR r15,r15

BNE LABEL

AH r0,=H'42'

LABEL:

ME r6,=E'3.1416'

.data

LITPOOL:

.ltorg

Note that this dual 

.using

directive semantics extends and is not compatible with HLASM se 

mantics. Note that this assembler directive does not support the full range of HLASM semantics.

20.6. Opcodes

For detailed information on the ESA/390 machine instruction set, see [ESA/390 Principles of Opera 

tion] (IBM Publication Number DZ9AR004).