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|
page 60,132 ;AN000;
name asm2c ;AN000;
title Limited assembler to C interface;AN000;
;-------------------------------------------------------------------
;
; MODULE: asm2c
;
; PURPOSE:
; This routine is used as to map the assembly language
; call made by xxx to a C language call.
;
; INPUT:
;
; ES:DI points to the buffer area where the table data
; will be copied
;
; CALLING FORMAT:
;
; DATE: 7-16-87
;
;-------------------------------------------------------------------
public gget_status ;AN000;
public asm2cInRegs ;AN000;
public asm2coutregs ;AN000;
public asm2csegregs ;AN000;
_TEXT segment byte public 'CODE' ;AN000;
_TEXT ends ;AN000;
_DATA segment word public 'DATA' ;AN000;
_DATA ends ;AN000;
CONST segment word public 'CONST' ;AN000;
CONST ends ;AN000;
_BSS segment word public 'BSS' ;AN000;
_BSS ends ;AN000;
DGROUP GROUP CONST, _BSS, _DATA ;AN000;
_DATA segment word public 'DATA' ;AN000;
;-------------------------------------------------------------------
; define an assembly language version of the C regs structure
;-------------------------------------------------------------------
asm2cInRegs equ $ ;AN000;
i_ax dw 0 ;AN000;
i_bx dw 0 ;AN000;
i_cx dw 0 ;AN000;
i_dx dw 0 ;AN000;
i_si dw 0 ;AN000;
i_di dw 0 ;AN000;
i_cflag dw 0 ;AN000;
Asm2cOutRegs equ $ ;AN000;
o_ax dw 0 ;AN000;
o_bx dw 0 ;AN000;
o_cx dw 0 ;AN000;
o_dx dw 0 ;AN000;
o_si dw 0 ;AN000;
o_di dw 0 ;AN000;
o_cflag dw 0 ;AN000;
Asm2cSegRegs equ $ ;AN000;
s_es dw 0 ;AN000;
s_cs dw 0 ;AN000;
s_ss dw 0 ;AN000;
s_ds dw 0 ;AN000;
extrn _end:far ;AN000;
_DATA ends ;AN000;
_TEXT segment byte public 'CODE' ;AN000;
extrn _get_status:near ;AN000;
ASSUME CS: _TEXT ;AN000;
assume ds: nothing ;AN000;
assume es: nothing ;AN000;
;-------------------------------------------------------------------
;-------------------------------------------------------------------
page ;AN000;
;-------------------------------------------------------------------
; ggetstatus
;
; This routine will reside in the C code segment
;
;-------------------------------------------------------------------
segment_of_dgroup dw seg dgroup;AN000;
SAVE_STACK LABEL DWORD ;AN000;
SAVE_SP DW 0 ;AN000;
SAVE_SS DW 0 ;AN000;
SAVE_DS DW 0 ;AN000;
SAVE_ES DW 0 ;AN000;
gget_status proc far ;AN000;
MOV SAVE_DS,DS ;AN000;
MOV SAVE_ES,ES ;AN000;
MOV SAVE_SS,SS ;AN000;
MOV SAVE_SP,SP ;AN000;
mov ss,segment_of_dgroup ;AN000;
add sp,offset DGROUP:_end ;AN000;
ASSUME SS: DGROUP ;AN000;
MOV DS,segment_of_dgroup ;AN000;
ASSUME DS: DGROUP ;AN000;
;-------------------------------------------------------------------
; set up InRegs
;-------------------------------------------------------------------
mov i_ax,ax ;AN000; make InRegs look like real registers
mov i_bx,bx ;AN000;
mov i_cx,cx ;AN000;
mov i_dx,dx ;AN000;
mov i_si,si ;AN000;
mov i_di,di ;AN000;
;-------------------------------------------------------------------
; set up SegRegs
;-------------------------------------------------------------------
IRP XX,<ES,SS,DS> ;AN000;
MOV AX,SAVE_&XX ;AN000;
MOV S_&XX,AX ;AN000;
ENDM ;AN000;
mov s_cs,cs ;AN000;
;-------------------------------------------------------------------
; put far pointers on stack
;-------------------------------------------------------------------
; push ds ; push far pointer to SegRegs
lea ax,DGROUP:Asm2cSegRegs;AN000;
push ax ;AN000;
; push ds ; push far pointer to OutRegs
lea ax,DGROUP:Asm2cOutRegs;AN000;
push ax ;AN000;
; push ds ; push far pointer to InRegs
lea ax,DGROUP:Asm2cInRegs;AN000;
push ax ;AN000;
;-------------------------------------------------------------------
call _get_status ;AN000;
;-------------------------------------------------------------------
add sp,6 ;AN000;
;-------------------------------------------------------------------
; set up real registers
;-------------------------------------------------------------------
mov ax,o_ax ;AN000; make real registers look like OutRegs
mov bx,o_bx ;AN000;
mov cx,o_cx ;AN000;
mov dx,o_dx ;AN000;
mov si,o_si ;AN000;
mov di,o_di ;AN000;
;-------------------------------------------------------------------
; must remove the things we put on the stack
;-------------------------------------------------------------------
MOV DS,SAVE_DS ;AN000;
MOV ES,SAVE_ES ;AN000;
MOV SS,SAVE_SS ;AN000;
MOV SP,SAVE_SP ;AN000;
ret ;AN000;
gget_status endp ;AN000;
_TEXT ends ;AN000; end code segment
;-------------------------------------------------------------------
;-------------------------------------------------------------------
end ;AN000;
|
