66 lines
1.3 KiB
PHP
66 lines
1.3 KiB
PHP
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;***
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;mm.inc - macros to write memory model dependent code
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;
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; Copyright (c) 1987-1998 Microsoft Corporation
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;
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;Purpose:
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; This file contains definitions of a number of macros which
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; make the writing of memory model dependent code for the
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; 8086 a little easier and more portable.
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;
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;*******************************************************************************
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; the macro below is used by the assigning long arithmetic routines (almul,
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; etc) to handle the model dependent data addressing - in small and middle
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; models data addresses default to short (2 byte) addresses. in large model,
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; data address are long (4 bytes).
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LOAD macro to,from
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if sizeD
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lds to,from
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else
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mov to,from
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endif
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endm
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; general code & data size constants & macros
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if sizeD ; 4 byte data addresses
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DAT_ADDR_SZ = 4
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BDAT_ADDR_SZ = 2
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else ; 2 byte data addresses
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DAT_ADDR_SZ = 2
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BDAT_ADDR_SZ = 4
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endif
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if sizeC ; 4 byte code addresses
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TXT_ADDR_SZ = 4
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else ; 2 byte code addresses
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TXT_ADDR_SZ = 2
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endif
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; Big/Little Endian Definitions for Long Integers
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LOWORD equ [0]
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HIWORD equ [2]
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; All Model Definitions
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BPARGBAS equ TXT_ADDR_SZ+2 ; offset from BP to first argument
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; macro for windows fixup with retf #
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return macro n
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org $-1
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if sizeC
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db 0cah
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else
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db 0c2h
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endif
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dw n
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endm
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