mirror of https://github.com/nmlgc/ReC98.git
110 lines
3.2 KiB
NASM
110 lines
3.2 KiB
NASM
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; *Not* the original file, but an edit to turn it into an includable slice.
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; Changes include:
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; * removal of RULES.ASI to eliminate redundancy
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; * removal of the 'CODE' segment declaration (for obvious reasons)
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;[]-----------------------------------------------------------------[]
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;| H_PADA.ASM -- long pointer routines |
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;[]-----------------------------------------------------------------[]
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;
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; C/C++ Run Time Library - Version 5.0
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;
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; Copyright (c) 1987, 1992 by Borland International
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; All Rights Reserved.
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;
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; calls to these routines are generated by the compiler to perform
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; arithmetic operations on long pointers.
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public PADA@
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public F_PADA@
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public N_PADA@
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N_PADA@:
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pop es ;fix up far return
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push cs
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push es
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PADA@:
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F_PADA@:
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mov es,dx
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xchg ax,bx
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;
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; Pointer to memory cell to increment is in es:bx
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; Increment amount is ax:cx
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;
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mov dx, es:2[bx] ; DX <- Selector
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push bx
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mov bx, es:[bx] ; BX <- Offset
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or cx,cx ; Is increment negative?
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jge ada1 ; No, ...
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not ax ; Yes, ...
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not cx
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add ax,1
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adc cx,0
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jmp sba1
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ada1:
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add bx,ax ; Add offsets
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jnc adaok
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add dx,1000h
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adaok:
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mov ah,cl
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mov cl,4
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shl ah,cl
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xor al,al
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add dx,ax
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mov ch,bl
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shr bx,cl
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add dx,bx
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mov al,ch
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and ax,0fh
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pop bx
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mov es:[bx], ax
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mov es:2[bx], dx
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retf
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public PSBA@
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public F_PSBA@
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public N_PSBA@
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N_PSBA@:
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pop es ;fix up far return
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push cs
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push es
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PSBA@:
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F_PSBA@:
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mov es,dx
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xchg ax,bx
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;
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; Pointer to memory cell to increment is in es:bx
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; Increment amount is ax:cx
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;
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mov dx,es:2[bx]
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push bx
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mov bx,es:[bx]
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or cx,cx
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jge sba1
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not ax
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not cx
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add ax,1
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adc cx,0
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jmp ada1
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sba1:
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sub bx,ax
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jnc sbaok
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sub dx,1000h
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sbaok:
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mov ah,cl
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mov cl,4
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shl ah,cl
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xor al,al
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sub dx,ax
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mov ch,bl
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shr bx,cl
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add dx,bx
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mov al,ch
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and ax,0fh
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pop bx
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mov es:[bx],ax
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mov es:2[bx],dx
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retf
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