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Text File | 1989-05-08 | 6.4 KB | 394 lines

;Assembly language macros for C compiler independence. Assemble with /mx ;to ensure mixed case symbols. ifndef MSC MSC equ 0 endif ifndef TURBO TURBO equ 0 endif ifndef AZTEC AZTEC equ 0 endif if MSC + TURBO + AZTEC NE 1 .err One and only one of MSC, TURBO, and AZTEC should be defined. endif ;Copyright, 1987, 1988, Russell Nelson ;Permission to use, copy, modify and distribute this software for any purpose ;and without fee is hereby granted, provided that the above copyright notice ;appears in all copies and that both that copyright notice and this permission ;appear in supporting documentation. Russell Nelson MAKES NO REPRESENTATIONS ;ABOUT THE SUITABILITY OF THIS SOFTWARE FOR ANY PURPOSE. IT IS PROVIDED ;"AS IS" WITHOUT EXPRESS OR IMPLIED WARRANTY. .xlist ;Note that symbols defined by these macros (pubproc, extproc, pubvar, extvar) ;should be referred by users of this package as 's@' where 's' is the defined ;symbol. This hides the compiler's underscore convention. For example, ; include pmacros.h ; extproc foo ; pubproc bar ; call foo@ ; pend bar ;begin a public procedure and label it 'a'. If 'd' is absent, then default ;to what LARGECODE says, otherwise 'd' must be 'far' or 'near'. ;Terminated by pend. pubproc macro a, d if AZTEC assume cs:_text, ds:dgroup endif if TURBO assume cs:_text, ds:dgroup endif if MSC assume cs:_TEXT, ds:DGROUP endif cseg if AZTEC a&@ equ a&_ public a&_ else a&@ equ _&a public _&a endif ifb <d> ifdef LARGECODE if AZTEC a&_ proc far else _&a proc far endif first_param = 6 else if AZTEC a&_ proc near else _&a proc near endif first_param = 4 endif else ;ifb if AZTEC a&_ proc d else _&a proc d endif ifidn <d>,<far> first_param = 6 else first_param = 4 endif endif endm ;used internally to expand first_param and increment it. _param macro a, o, t, n a equ t ptr o[bp] first_param = first_param + n endm ;declare a parameter. Use byte, word, ptr, or fptr (function pointer). param macro a, t ifidn <t>,<byte> _param a, %first_param, byte, 2 endif ifidn <t>,<word> _param a, %first_param, word, 2 endif ifidn <t>,<ptr> ifdef LARGEDATA _param a, %first_param, dword, 4 else _param a, %first_param, word, 2 endif endif ifidn <t>,<fptr> ifdef LARGECODE _param a, %first_param, dword, 4 else _param a, %first_param, word, 2 endif endif endm ;load a data pointer. ldptr macro off_reg,var,seg_reg ifdef LARGEDATA l&seg_reg off_reg,var else mov off_reg,var endif endm ;define a public procedure with parameters, like so: ;procdef foo, <<bar, word>, <baz, ptr>> ;Terminated by pret, pend procdef macro n, a pubproc n irp one_param, <a> param one_param endm push bp mov bp,sp endm ;return from a procedure with parameters. Pairs with procdef pret macro pop bp ret endm ;end a public procedure. Pairs with pubproc pend macro a if AZTEC a&_ endp else _&a endp endif csegend endm ;define an external procedure called 'a'. If 'd' is absent, then default ;to what LARGECODE says, otherwise 'd' must be 'far' or 'near'. extproc macro a, d ifb <d> ifdef LARGECODE if AZTEC extrn a&_: far else extrn _&a: far endif else if AZTEC extrn a&_: near else extrn _&a: near endif endif else ;ifb if AZTEC extrn a&_: d else extrn _&a: d endif endif if AZTEC a&@ equ a&_ else a&@ equ _&a endif endm ;open the code segment cseg macro if AZTEC codeseg segment byte public 'code' assume cs:code, ds:dataseg endif if TURBO _TEXT segment byte public 'CODE' dgroup group _DATA,_BSS assume cs:_TEXT, ds:dgroup endif if MSC _TEXT SEGMENT BYTE PUBLIC 'CODE' DGROUP GROUP CONST, _BSS, _DATA assume cs:_TEXT, ds:DGROUP endif endm ;close the code segment csegend macro if AZTEC codeseg ends endif if TURBO or MSC _TEXT ends endif endm ;assume that the ds is the code segment dscode macro if AZTEC assume ds:codeseg endif if TURBO or MSC assume ds:_TEXT endif endm ;Return the data segment getds macro if AZTEC mov ax,dataseg endif if TURBO mov ax,dgroup endif if MSC mov ax,DGROUP endif endm ;open the data segment dseg macro if AZTEC dataseg segment word public 'data' endif if TURBO or MSC _DATA segment word public 'DATA' endif endm ;close the data segment dsegend macro if AZTEC dataseg ends endif if TURBO or MSC _DATA ends endif endm ;open the uninitialized data segment bseg macro if AZTEC bssseg segment word public 'data' endif if TURBO _BSS segment word public 'DATA' endif if MSC _BSS segment word public 'BSS' endif endm ;close the uninitialized data segment bsegend macro if AZTEC bssseg ends endif if TURBO or MSC _BSS ends endif endm ;define a public variable ;use it like so: pubvar a,<dw 0> pubvar macro n,d if AZTEC public n n&@ equ n n d endif if TURBO or MSC public _&n n&@ equ _&n _&n d endif endm ;define an external variable ;use it like so: extvar a,word ; or extvar a,byte extvar macro n,d if AZTEC n&@ equ n&_ extrn n&_: d endif if TURBO or MSC n&@ equ _&n extrn _&n: d endif endm ; Conditional DS save/restore macros pushds macro ifdef LARGEDATA push ds endif endm popds macro ifdef LARGEDATA pop ds endif endm ; Conditional ES save/restore macros pushes macro ifdef LARGEDATA push es endif endm popes macro ifdef LARGEDATA pop es endif endm ;define the segments so that they exist. dseg dsegend bseg bsegend cseg csegend ;define an interrupt handler. inthandler macro xxxname, xxxnum dseg extvar sssave,word extvar spsave,word extvar intstk,byte dsegend extproc doret extproc xxxname&int pubproc xxxname&xxxnum&vec push ax ; save ax first. push ds ; save on user stack getds mov ds,ax mov sssave@,ss ; stash user stack context mov spsave@,sp mov ss,ax ; set up interrupt stack lea sp,intstk@ push bx ; save user regs on interrupt stack push cx push dx push bp push si push di push es push ds pop es mov ax,xxxnum ; arg for service routine push ax call xxxname&int@ pop ax jmp doret@ pend xxxname&xxxnum&vec endm .list