.JSB32_ENTRY

   Declares the entry point of a JSB routine to the compiler. This
   directive does not preserve any VAX register values (R2 through
   R12) unless the PRESERVE parameter is specified. The routine
   itself may save and restore registers by pushing them on the
   stack, but this will not preserve the upper 32 bits of the
   registers. See also .JSB_ENTRY.

                                WARNING

      The .JSB32_ENTRY directive can be a great time-saver if you
      are sure that you can use it. If you use .JSB32_ENTRY in a
      situation where the upper 32 bits of a register are being
      used, it may cause very obscure and difficult-to-track bugs
      by corrupting a 64-bit value that may be several calling
      levels above the offending routine.

      .JSB32_ENTRY should never be used in an AST routine,
      condition handler, or any other code that can be executed
      asynchronously.

   Format

     .JSB32_ENTRY  [input] [,output] [,scratch] [,preserve]
 

Additional information available:

Parameters      Description