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/*-------------------------------------------------------------------------
_gptrput.c - put value for a generic pointer
Copyright (c) 1999, Sandeep Dutta . sandeep.dutta@usa.net
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.
-------------------------------------------------------------------------*/
/* not all devices use P2 to page pdata memory, therefore __XPAGE was
introduced. On some targets __XPAGE itself is a paged SFR so it is
not safe for all platforms to set this. Furthermore some targets
can be configured to behave differently for movx @dptr vs. movx @Ri
(don't drive high byte of address bus for movx @Ri only) */
#define USE_PDATA_PAGING_REGISTER 0
__sbit __at (0xF7) B_7;
__sbit __at (0xF6) B_6;
__sbit __at (0xF5) B_5;
#if defined DSDCC_MODEL_HUGE
void
_gptrput (char *gptr, char c) __naked
{
/* This is the banked version with pointers up to 22 bits.
B cannot be trashed */
gptr; c; /* hush the compiler */
__asm
;
; depending on the pointer type according to SDCCsymt.h
;
jb _B_7,codeptr$ ; >0x80 code ; 3
jnb _B_6,xdataptr$ ; <0x40 far ; 3
mov dph,r0 ; save r0 independant of regbank ; 2
mov r0,dpl ; use only low order address ; 2
jb _B_5,pdataptr$ ; >0x60 pdata ; 3
;
; store into near/idata space
;
mov @r0,a ; 1
dataptrrestore$:
mov r0,dph ; restore r0 ; 2
mov dph,#0 ; restore dph ; 2
ret ; 1
;
; cannot store into code space, lock up
;
codeptr$:
sjmp . ; 2
;
; store into external stack/pdata space
;
pdataptr$:
movx @r0,a ; 1
sjmp dataptrrestore$ ; 2
;
; store into far space
;
xdataptr$:
mov _P3,b ; 3
movx @dptr,a ; 1
ret ; 1
;===
;29 bytes
__endasm;
}
#elif defined DSDCC_MODEL_MEDIUM
void
_gptrput (char *gptr, char c) __naked
{
/* This is the non-banked version with pointers up to 14 bits.
Assumes B is free to be used */
gptr; c; /* hush the compiler */
__asm
;
; depending on the pointer type according to SDCCsymt.h
;
mov b,dph ; 3
jb _B_7,codeptr$ ; >0x80 code ; 3
jnb _B_6,xdataptr$ ; <0x40 far ; 3
mov b,r0 ; save r0 independant of regbank ; 2
mov r0,dpl ; use only low order address ; 2
jb _B_5,pdataptr$ ; >0x60 pdata ; 3
;
; store into near/idata space
;
mov @r0,a ; 1
dataptrrestore$:
mov r0,b ; restore r0 ; 2
ret ; 1
;
; cannot store into code space, lock up
;
codeptr$:
sjmp . ; 2
;
; store into external stack/pdata space
;
pdataptr$:
movx @r0,a ; 1
sjmp dataptrrestore$ ; 2
;
; store into far space, max 14 bits
;
xdataptr$:
; 0 <= dptr <= 0x3FFF
movx @dptr,a ; 1
ret ; 1
;===
;27 bytes
__endasm;
}
#else
void
_gptrput (char *gptr, char c) __naked
{
/* This is the new version with pointers up to 16 bits.
B cannot be trashed */
gptr; c; /* hush the compiler */
__asm
;
; depending on the pointer type according to SDCCsymt.h
;
jb _B_7,codeptr$ ; >0x80 code ; 3
jnb _B_6,xdataptr$ ; <0x40 far ; 3
mov dph,r0 ; save r0 independant of regbank ; 2
mov r0,dpl ; use only low order address ; 2
jb _B_5,pdataptr$ ; >0x60 pdata ; 3
;
; store into near/idata space
;
mov @r0,a ; 1
dataptrrestore$:
mov r0,dph ; restore r0 ; 2
mov dph,#0 ; restore dph ; 2
ret ; 1
;
; cannot store into code space, lock up
;
codeptr$:
sjmp . ; 2
;
; store into external stack/pdata space
;
pdataptr$:
movx @r0,a ; 1
sjmp dataptrrestore$ ; 2
;
; store into far space
;
xdataptr$:
movx @dptr,a ; 1
ret ; 1
;===
;26 bytes
__endasm;
}
#endif
#ifdef __SDCC_ds390
void
_gptrputWord (int *gptr, int w) __naked
{
/* The ds390 can write two bytes in one go.
B cannot be trashed */
gptr; w; /* hush the compiler */
__asm
;
; depending on the pointer type acc. to SDCCsymt.h
;
jb _B_7,codeptr_w$ ; >0x80 code
jnb _B_6,xdataptr_w$ ; <0x40 far
mov dph,r0 ; save r0 independant of regbank
mov r0,dpl ; use only low order address
jb _B_5,pdataptr_w$ ; >0x60 pdata
;
; store into near space
;
mov @r0,acc1
inc r0
mov @r0,a
dataptrrestore_w$:
mov dpl,r0
mov r0,dph ; restore r0
mov dph,#0 ; restore dph
ret
;
; cannot store into code space, lock up
;
codeptr_w$:
sjmp .
;
; store into xstack space
;
pdataptr_w$:
xch a,acc1
movx @r0,a
inc r0
xch a,acc1
movx @r0, a
sjmp dataptrrestore_w$
;
; store into far space
;
xdataptr_w$:
xch a,acc1
movx @dptr,a
inc dptr
xch a,acc1
movx @dptr,a
ret
__endasm;
}
#endif
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