1/* Copyright (c) 2010 Jan Waclawek 2 3 based on libc/pmstring/memcmp_P.S which is 4 Copyright (c) 2002, 2007 Marek Michalkiewicz 5 Copyright (c) 2007 Dmitry Xmelkov 6 and on exteded program memory routines, which are 7 Copyright (c) 2006, Carlos Lamas 8 9 All rights reserved. 10 11 Redistribution and use in source and binary forms, with or without 12 modification, are permitted provided that the following conditions are met: 13 14 * Redistributions of source code must retain the above copyright 15 notice, this list of conditions and the following disclaimer. 16 * Redistributions in binary form must reproduce the above copyright 17 notice, this list of conditions and the following disclaimer in 18 the documentation and/or other materials provided with the 19 distribution. 20 * Neither the name of the copyright holders nor the names of 21 contributors may be used to endorse or promote products derived 22 from this software without specific prior written permission. 23 24 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 25 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 28 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 29 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 30 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 31 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 32 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 33 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 34 POSSIBILITY OF SUCH DAMAGE. */ 35 36/* $Id: memcmp_PF.S 2503 2016-02-07 22:59:47Z joerg_wunsch $ */ 37 38#if !defined(__AVR_TINY__) 39 40#if !defined(__DOXYGEN__) 41 42#include "macros.inc" 43 44#define s1_b1 r25 45#define s1_b0 r24 46#define s2_b3 r23 47#define s2_b2 r22 48#define s2_b1 r21 49#define s2_b0 r20 50#define len_b1 r19 51#define len_b0 r18 52 53#define ret_b1 r25 54#define ret_b0 r24 55 56/* the conditional caters for pre-1.6.8 libc and standalone use */ 57#ifdef ASSEMBLY_CLIB_SECTION 58 ASSEMBLY_CLIB_SECTION 59#else 60 .text 61#endif 62 .global _U(memcmp_PF) 63 .type _U(memcmp_PF), @function 64_U(memcmp_PF): 65 X_movw ZL, s2_b0 66 LPM_R0_ZPLUS_INIT s2_b2 67 X_movw XL, s1_b0 68 69 rjmp 2f 70 711: 72 ld ret_b0, X+ 73 LPM_R0_ZPLUS_NEXT s2_b2 74 sub ret_b0, r0 75 brne 3f 762: 77 subi len_b0, lo8(1) 78 sbci len_b1, hi8(1) 79 brsh 1b 80 81 sub ret_b0, ret_b0 823: 83 sbc ret_b1, ret_b1 84 ret 85 86 .size _U(memcmp_PF), . - _U(memcmp_PF) 87 88#endif /* not __DOXYGEN__ */ 89 90#endif /* !defined(__AVR_TINY__) */ 91