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/*-------------------------------------------------------------------------
gstack.c - debug stack tracing support function
Copyright (C) 2004, Vangelis Rokas <vrokas at otenet.gr>
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.
-------------------------------------------------------------------------*/
extern int WREG;
extern int FSR1L;
extern int FSR1H;
extern int FSR0L;
extern int FSR0H;
extern int STATUS;
extern int POSTINC0;
extern int POSTDEC1;
extern int PREINC1;
extern int TOSL;
extern int TOSH;
extern int TOSU;
extern int PCL;
extern int PCLATH;
extern int PCLATU;
extern int stack;
extern int stack_end;
#pragma udata access _wreg_store _status_store _fsr0_store
#pragma udata access _gstack_begin _gstack_end _init_ok
static char _init_ok=0;
static char _wreg_store;
static char _status_store;
static unsigned int _fsr0_store;
static unsigned int _gstack_begin;
static unsigned int _gstack_end;
char _gstack_fail_str[]="Stack overflow\n";
char _gstack_succ_str[]="Stack ok\n";
static
void _gstack_overflow_default(void) __naked
{
__asm
lfsr 0, __gstack_fail_str
; incf _FSR0L, f
@0:
movf _POSTINC0, w
movff _WREG, 0xf7f
bnz @0
; sleep
@00:
goto @00
__endasm ;
}
void (* _gstack_overflow)(void)=_gstack_overflow_default;
void _gstack_init(void) __naked
{
__asm
movlw LOW(_stack)
movwf __gstack_begin
movlw HIGH(_stack)
movwf __gstack_begin+1
movlw LOW(_stack_end)
movwf __gstack_end
movlw HIGH(_stack_end)
movwf __gstack_end+1
; load default handler
; movlw LOW(__gstack_overflow_default)
; movwf __gstack_overflow
; movlw HIGH(__gstack_overflow_default)
; movwf __gstack_overflow+1
; movlw UPPER(__gstack_overflow_default)
; movwf __gstack_overflow+2
movlw 1
movwf __init_ok
return;
__endasm ;
}
void _gstack_test(void) __naked
{
__asm
movff _WREG, __wreg_store
movff _STATUS, __status_store
; if first time, initialize boundary variables
movf __init_ok, w
bnz @1
call __gstack_init
@1:
movf __gstack_begin, w
cpfslt _FSR1L
bra @2
bra @3
@2:
movf __gstack_begin+1, w
cpfslt _FSR1H
bra @4
bra @3
@4:
movf __gstack_end, w
cpfsgt _FSR1L
bra @5
bra @3
@5:
movf __gstack_end+1, w
cpfsgt _FSR1H
bra @6
; fail
@3:
push
movlw LOW(ret_lab)
movwf _TOSL
movlw HIGH(ret_lab)
movwf _TOSH
movlw UPPER(ret_lab)
movwf _TOSU
movff __gstack_overflow+2, _PCLATU
movff __gstack_overflow+1, _PCLATH
movf __gstack_overflow, w
; execute
movwf _PCL
ret_lab:
bra @10
; success
@6:
movff _FSR0L, __fsr0_store
movff _FSR0H, __fsr0_store+1
lfsr 0, __gstack_succ_str
; print corresponding string
@8:
movf _POSTINC0, w
movff _WREG, 0xf7f
bnz @8
@9:
movff __fsr0_store+1, _FSR0H
movff __fsr0_store, _FSR0L
@10:
movff __status_store, _STATUS
movff __wreg_store, _WREG
return
__endasm ;
}
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