46 lines
1.1 KiB
NASM
46 lines
1.1 KiB
NASM
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DGROUP group data
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data segment word public 'DATA'
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assume DS:DGROUP
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data ends
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PGROUP group prog
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prog segment byte public 'PROG'
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assume CS:PGROUP
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public isw_int,fsw_int,tsw_int,ssw_int
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SWI_ARGS struc
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OLDBP DW ?
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RET_ADDR DW ?
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INT_NUM DW ?
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AX_ARG DW ?
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BX_ARG DW ?
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CX_ARG DW ?
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DX_ARG DW ?
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SWI_ARGS ends
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sw_int proc near
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isw_int:
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fsw_int:
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tsw_int:
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ssw_int:
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push bp ; Save Base Pointer
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mov bp,sp ; Update with Stack Pointer
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mov ax,[bp].INT_NUM ; Get interrupt number
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mov cs:int_no,al ; Move to location in code
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mov ax,[bp].AX_ARG ; Load ax register with 1st arg
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mov bx,[bp].BX_ARG ; Load bx register with 2nd arg
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mov cx,[bp].CX_ARG ; Load cx register with 3rd arg
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mov dx,[bp].DX_ARG ; Load dx register with 4th arg
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db 0CDh ; Byte code for INT instruction
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int_no db 070h ; Byte code for interrupt number
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pop bp
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ret ; and go back to the caller.
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sw_int endp
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prog ends
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end
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