saunders@carina.unm.edu (Richard Saunders CIRT) (07/07/90)
Help! Some application interfaces, like XMS and Netware IPX/SPX, are
called with FAR CALLs instead of software interrupts. This poses no problem
to assembly language programmers, but I'm working in C and I'm pretty
inexperienced at 8086 assembly language. I need something similar to int86()
and int86x() that will let me load the various registers, do a far call, and
then examine the register contents in Microsoft C 5.0 || Mix Power C.
Surely I'm not the first to face this problem...
-- Richard Saunderskdq@demott.COM (Kevin D. Quitt) (07/08/90)
In article <1990Jul7.100712.7027@ariel.unm.edu> saunders@carina.unm.edu (Richard Saunders CIRT) writes: > > Help! Some application interfaces, like XMS and Netware IPX/SPX, are >called with FAR CALLs instead of software interrupts. This poses no problem >to assembly language programmers, but I'm working in C and I'm pretty >inexperienced at 8086 assembly language. I need something similar to int86() >and int86x() that will let me load the various registers, do a far call, and >then examine the register contents in Microsoft C 5.0 || Mix Power C. > Surely I'm not the first to face this problem... If the XMS and Netware libraries are written for C, then you need only compile in large model (/AL) or declare the functions your are using as far functions: e.g. extern void far function_foo(); If they require values placed in specific registers, then you'll need an assembly routine - but only one. Declare the function as above, and: call_far_fn( function_foo, ax, bx, cx, dx ); where call_far_fn is an asembly routine that loads up the registers as specified, then does the far call, and passes the return value back to C (generally in AX, or DX:AX). You could even define a macro like: #define FN_foo(a, b, c, d) call_far_fn( function_foo, (a), (b), (c), (d)) then invoke it like: FN_foo( ax, bx, cx, dx ); Good luck! -- _ Kevin D. Quitt demott!kdq kdq@demott.com DeMott Electronics Co. 14707 Keswick St. Van Nuys, CA 91405-1266 VOICE (818) 988-4975 FAX (818) 997-1190 MODEM (818) 997-4496 PEP last 96.37% of all statistics are made up.