1 /*-------------------------------------------------------------------------
3 _gptrget.c :- get value for a generic pointer
5 Written By - Sandeep Dutta . sandeep.dutta@usa.net (1999)
7 This library is free software; you can redistribute it and/or modify it
8 under the terms of the GNU Library General Public License as published by the
9 Free Software Foundation; either version 2, or (at your option) any
12 This library is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU Library General Public License for more details.
17 You should have received a copy of the GNU Library General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
21 In other words, you are welcome to use, share and improve this program.
22 You are forbidden to forbid anyone else to use, share and improve
23 what you give them. Help stamp out software-hoarding!
24 -------------------------------------------------------------------------*/
26 /* not all devices use P2 to page pdata memory, therefore __XPAGE was
27 introduced. On some targets __XPAGE itself is a paged SFR so it is
28 not save for all platforms to set this */
29 #define USE_PDATA_PAGING_REGISTER 0
31 /* the return value is expected to be in acc, and not in the standard
32 * location dpl. Therefore we choose return type void here: */
36 gptr; /* hush the compiler */
41 ; depending on the pointer type acc. to SDCCsymt.h
51 dec a ; 4 skip generic pointer
55 ; any other value for type
60 ; Pointer to data space
65 mov r0,dpl ; use only low order address
72 ; pointer to xternal data
78 ; pointer to code area
85 ; pointer to xternal stack or pdata
88 #if USE_PDATA_PAGING_REGISTER
89 mov dph,__XPAGE ; __XPAGE (usually p2) holds high byte for pdata access
106 /* the return value is expected to be in acc/_ap, and not in the standard
107 * location dpl/dph. Therefore we choose return type void here: */
109 _gptrgetWord (unsigned *gptr)
111 gptr; /* hush the compiler */
115 ; depending on the pointer type acc. to SDCCsymt.h
125 dec a ; 4 skip generic pointer
129 ; any other value for type
134 ; Pointer to data space
138 mov r0,dpl ; use only low order address
145 ; pointer to xternal data
154 ; pointer to code area
165 ; pointer to xternal stack