; -------------------------------------------------------------------------
;  _gptrget1.S - read one byte pointed to by a generic pointer
;
;  Copyright (C) 2005, Raphael Neider <rneider AT web.de>
;
;  This library is free software; you can redistribute it and/or modify it
;  under the terms of the GNU General Public License as published by the
;  Free Software Foundation; either version 2, or (at your option) any
;  later version.
;
;  This library is distributed in the hope that it will be useful,
;  but WITHOUT ANY WARRANTY; without even the implied warranty of
;  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;  GNU General Public License for more details.
;
;  You should have received a copy of the GNU General Public License 
;  along with this library; see the file COPYING. If not, write to the
;  Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
;   MA 02110-1301, USA.
;
;  As a special exception, if you link this library with other files,
;  some of which are compiled with SDCC, to produce an executable,
;  this library does not by itself cause the resulting executable to
;  be covered by the GNU General Public License. This exception does
;  not however invalidate any other reasons why the executable file
;  might be covered by the GNU General Public License.
;--------------------------------------------------------------------------

; calling conventions:
;   3 byte generic pointer is passed in via (WREG STK00 STK01).
;   The result is returned in (WREG (STK00 (STK01 (STK02)))).
;
;   unsigned char _gptrget  (void *gptr);
;   unsigned char _gptrget1 (void *gptr);
;   unsigned int  _gptrget2 (void *gptr);
;   void *        _gptrget3 (void *gptr);
;   unsigned long _gptrget4 (void *gptr);
;
;   void _gptrput  (void *ptr, unsigned char val);
;   void _gptrput1 (void *ptr, unsigned char val);
;   void _gptrput2 (void *ptr, unsigned int  val);
;   void _gptrput3 (void *ptr, unsigned int  val);
;   void _gptrput4 (void *ptr, unsigned long val);

include macros.inc
include p16f_common.inc

	global	__gptrget
	global	__gptrget1
	global	__codeptrget1
	
	CODE

__gptrget:
__gptrget1:
	select_routine __dataptrget1, __codeptrget1
	; invalid tag -- return 0x00
	retlw	0x00

__dataptrget1:
	setup_fsr
	movf	_INDF0, W
	return

__codeptrget1:
	; call the RETLW instruction at the given address
	movf	STK00, W
	movwf	_PCLATH
	movf	STK01, W
	movwf	_PCL
	return	; should never be executed...

	END
