assemblycompilationlinkervmsopenvms

Develop in Assembly on OpenVMS?

Someone can explain me how to develop in assembly on OpenVMS, I already develop in C on OpenVMS and I've just start with assembly in Windows and Linux. How can I compile, link and run an .asm program?

Solution

  • Just use the HELP and RTFM (Read The Fine Manuals)

    Suggested Google string = site:hp.com openvms macro

    Below is a trivial example i just typed in, in one go. Create; Compile; link; run.

    This was On Itanium. Alpha and Vax would be exactly the same for such trivial program

    The hardest part was to paste the code example here... the { } code block was eating my new-lines, if the line did not start with 4+ spaces. Odd! 'Trying to help' POS!

    First, create a file:

    $CREATE test.mar

    Then we put this text into that file:

         .psect  data    wrt,noexe
hello:
     .ascid  "Hello World"

     .psect  code    nowrt,exe

     .entry  start, 0
     movl    #5, R8
10$:
     pushaq  hello
     calls   #1, G^lib$put_output
     sobgtr  R8, 10$
     ret
     .end start

    With that completed, hit control-z to return to DCL and compile and run:

    $ MACRO test
$ LINK test
$ RUN test 
Hello World
Hello World
Hello World
Hello World
Hello World
$