source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Inc/macros.inc@ 90

; Project name  :   XTIDE Universal BIOS
; Description   :   This is the place to put various generic macros.
;                   Should be included immediately after emulate.inc

;--------------------------------------------------------------------
; Skips the immediately following 2 byte instruction by using it
; as an immediate value to a dummy instruction.
; Destroys the contents of %1.
;
; SKIP2B
;   Parameters:
;       %1:     Any 16 bit general purpose register or F for flags.
;   Returns:
;       Nothing
;   Corrupts registers:
;       %1
;--------------------------------------------------------------------
%macro SKIP2B 1
    %ifidni     %1, f
        db  03Dh                    ; Opcode byte for CMP AX, <immed>
        ;db 0A9h                    ; Alt. version TEST AX, <immed>
    %elifidni   %1, ax
        db  0B8h                    ; Opcode byte for MOV AX, <immed>
    %elifidni   %1, cx
        db  0B9h                    ; Opcode byte for MOV CX, <immed>
    %elifidni   %1, dx
        db  0BAh                    ; Opcode byte for MOV DX, <immed>
    %elifidni   %1, bx
        db  0BBh                    ; Opcode byte for MOV BX, <immed>
    %elifidni   %1, sp
        db  0BCh                    ; Opcode byte for MOV SP, <immed>
    %elifidni   %1, bp
        db  0BDh                    ; Opcode byte for MOV BP, <immed>
    %elifidni   %1, si
        db  0BEh                    ; Opcode byte for MOV SI, <immed>
    %elifidni   %1, di
        db  0BFh                    ; Opcode byte for MOV DI, <immed>
    %else
        %error "Invalid parameter passed to SKIP2B"
    %endif
%endmacro