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Status Delivered
Workspace IBM High Level Assembler for z/OS and z/VM
Categories Assembler
Created by Guest
Created on Jul 22, 2023

RELATED IDEAS

High Level Assembler support for V and A type constants in Immediate instructions

The advantage of Immediate instructions is lost if V and A type constants must only be used in LTORG and DC assembler instructions as then it causes a storage reference.

Example:
LLILF 15,V(EXTMOD01) Causes an assembly error
or
LGFI 15,V(EXTMOD01)

It should be possible to make a suitable entry in the ESD for this, and in fact, using ORG it can be made to work.

Idea priority Low
  • Guest
    Reply
    |     Jul 22, 2023

    OK, to be fair, it can be achieved with something like the following...

    EXTRN EXTMOD01
    LLILF 15,EXTMOD01

    But NOT as a V-type constant directly, your point is well taken. My apologies for the confusion, I think this is acceptable.

  • Guest
    Reply
    |     Jul 22, 2023

    Yes, I know. But all you need is an entry in the ESD as for any EXTERN of A(SUBRTN) or V(EXTMOD01). The Binder should then do the appropriate address relocation.

    As I said I can artificially cause that, e.g.

    LLILF 15,0
    ORG *-4
    DC V(EXTMOD01)

  • Guest
    Reply
    |     Jul 22, 2023
    Relocatable address expressions in 4-byte immediate operands have been supported since APAR PH30740 in October 2020.

    A machine instruction operand is an expression, not a DC-like term, so V-type addresses cannot be supported in this context.

    - Jonathan Scott, HLASM

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