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https://github.com/vxunderground/MalwareSourceCode
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47 lines
1.5 KiB
NASM
47 lines
1.5 KiB
NASM
DOSCALL SEGMENT 'CODE'
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ASSUME CS:DOSCALL,DS:DOSCALL
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;
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;Procedure DOSVIO(VAR: AX, BX, CX, DX: Word);
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;
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; Issue a DOS VIDEO I/O INT (10) with register values set by caller
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;
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; FRAME: ADR AX; 12
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; ADR BX; 10
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; ADR CX; 08
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; ADR DX; 06
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; <RET BP>; 00
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;
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PUBLIC DOSVIO
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DOSVIO PROC FAR
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PUSH BP ;Save current BP value
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MOV BP,SP ;To address parms
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MOV DI,[BP+12] ;Address of AX
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MOV AX,[DI] ;Set AX value
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MOV DI,[BP+10] ;Address of BX
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MOV BX,[DI] ;Set BX value
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MOV DI,[BP+08] ;Address of CX
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MOV CX,[DI] ;Set CX value
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MOV DI,[BP+06] ;Address of DX
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MOV DX,[DI] ;Set DX value
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INT 10H ;Call BIOS with caller's AX, BX, CX, DX
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MOV DI,[BP+12] ;Now put them all back...
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MOV [DI],AX
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MOV DI,[BP+10]
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MOV [DI],BX
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MOV DI,[BP+08]
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MOV [DI],CX
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MOV DI,[BP+06]
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MOV [DI],DX
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POP BP ;Restore frame pointer
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RET 6 ;Return, poping 6 bytes
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DOSVIO ENDP
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DOSCALL ENDS
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END
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*** CREATED 06/28/82 21:05:48 BY AMD ***
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