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stack.h
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;File: stack.h
; ========================================================================
; PIC Floating point library
; ========================================================================
; Copyright (C) 1991,1997,1998,1999,2000,2001,2002,2003 Mike Gore
; All rights reserved.
;
; Redistribution and use in source and binary forms, with or without
; modification, are permitted provided that the following conditions are met:
;
; * Redistributions of source code must retain the above copyright notice,
; this list of conditions and the following disclaimer.
; * Redistributions in binary form must reproduce the above copyright notice,
; this list of conditions and the following disclaimer in the documentation
; and/or other materials provided with the distribution.
; * Neither the name of the <ORGANIZATION> nor the names of its contributors
; may be used to endorse or promote products derived from this software
; without specific prior written permission.
;
; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
; IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
; ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
; LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
; CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
; SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
; INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
; CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
; ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
; POSSIBILITY OF SUCH DAMAGE
;
; Contact Information
; Mike Gore
; Infowrite Consulting
; 405 Midwood Cres.
; Waterloo Ont
; N2L 5N4
; Phone: 519-884-4943 home
; Fax: 519-885-0548 fax
; Email: [email protected] - or - [email protected]
; ========================================================================
; ========================================================================
; ***** Please Use TABS = 4 when viewing this file ****
; ========================================================================
#ifndef _SP_H
#define _SP_H
; INCLUDE "macro.h"
; ===========================================================
; PSEUDO STACK
cblock
_SP,_W,STACK:8
endc
PUSHW MACRO
CALL _PUSHW
ENDM
POPW MACRO
CALL _POPW
ENDM
; PUSH W
_PUSHW:
INC8 _SP ; ++STACK
movwf _W ; _W = W
SWAP8 FSR,_SP ; Exchange STACK and FSR
MOV8 INDR,_W ; [_SP] = _W
SWAP8 FSR,_SP ; Exchange STACK and FSR
movfw _W ; W = _W
ENDSUB
; POP W
_POPW: ; Push W
SWAP8 FSR,_SP ; Exchange STACK and FSR
MOV8 _W,INDR ; _W = [_SP]
SWAP8 FSR,_SP ; Exchange STACK and FSR
DEC8 _SP ; --STACK
movfw _W ; W = _W
ENDSUB
; ======================================================
#endif