ST486DX - ASSEMBLER MACROS FOR SGS-THOMSON INSTRUCTIONS

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A.

ASSEMBLER MACROS FOR SGS-THOMSON INSTRUCTIONS

The include file SMICAM.INC provides a complex set of macros which generate SMM opcodes

along with the appropriate mod/rm bytes. In order to function, the macros require that the labels

which are accessed correspond to the specified segment. Thus segment overrides must be passed to

the macro as an argument.

Do not specify a segment override if the default segment for an address is being used. If an address

size override is used, a final argument of ‘1’ must be passed to the macro as well. Address size

overrides must be presented explicitly to prevent the assembler from generating them automatically

and breaking the macros.

;SMM Instruction Macros - SMIMAC.INC

;Macros which generate mod/rm automatically

svdc

MACRO

segover,addr,reg,adover

domac

segover,addr,reg,adover,78h

ENDM

rsdc

MACRO

reg,segover,addr,adover

domac

segover,addr,reg,adover,79h

ENDM

svldt

MACRO

segover,addr,adover

domac

segover,addr,es,adover,7ah

ENDM

rsldt

MACRO

segover,addr,adover

domac

segover,addr,es,adover,7bh

ENDM

svts

MACRO

segover,addr,adover

domac

segover,addr,es,adover,7ch

ENDM

rsts

MACRO

segover,addr,adover

domac

segover,addr,es,adover,7dh

ENDM

rsm

MACRO

db

0fh,0aah

ENDM

;Sub-Macro used by the above macro

domac

MACRO

segover,addr,reg,adover,op

local

place1,place2,count

count

= 0

ifnb

< adover >

count=count+1

endif

ifnb

< segover >