Q33364: Small-Memory Model and Far Routines

Article: Q33364
Product(s): See article
Version(s): 4.00 5.00 5.10 | 5.10
Operating System(s): MS-DOS | 5.10
Keyword(s): ENDUSER | | mspl13_c
Last Modified: 27-JUL-1988

Question:
   Is it incorrect to call a routine with a far call in the small
memory model?
   When I try to call a C routine with a far call (from assembler),
the CS register never changes and items start to be executed from the
current CS instead of the one my routine is at. Are there any rules
that must be followed to make a far call in the small-memory model?

Response:
   In order for this to work correctly you need to be sure that the
function is declared and defined as a far function (e.g. int far foo()).

THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY.

Copyright Microsoft Corporation 1986-2002.