ultoa.S

/* Copyright (c) 2012  Georg-Johann Lay

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 copyright holders nor the names of
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. */

/* $Id$ */

#if     !defined (__DOXYGEN__)
#if     !defined (__AVR_TINY__)

#include "asmdef.h"

/* char *ultoa (unsigned long val, char *s, int radix)  */

#define val_lo  r22
#define str_lo  r20
#define rdx_lo  r18
#define rdx_hi  r19

ENTRY   ultoa
ENTRY   __ultoa

cpi     rdx_lo, 37
cpc     rdx_hi, __zero_reg__
brsh    1f
cpi     rdx_lo, 2
brlo    1f
XJMP    _U(__ultoa_ncheck)

1:      X_movw  ZL, str_lo
st      Z, __zero_reg__
X_movw  r24, str_lo
ret

ENDFUNC

#endif  /* !__AVR_TINY__ */
#endif  /* !__DOXYGEN__ */