1*84d9c625SLionel Sambuc/* $NetBSD: strncmp.S,v 1.2 2013/08/19 00:57:25 matt Exp $ */ 2b6cbf720SGianluca Guida 3b6cbf720SGianluca Guida/* 4b6cbf720SGianluca Guida * Copyright (c) 2002 ARM Ltd 5b6cbf720SGianluca Guida * All rights reserved. 6b6cbf720SGianluca Guida * 7b6cbf720SGianluca Guida * Redistribution and use in source and binary forms, with or without 8b6cbf720SGianluca Guida * modification, are permitted provided that the following conditions 9b6cbf720SGianluca Guida * are met: 10b6cbf720SGianluca Guida * 1. Redistributions of source code must retain the above copyright 11b6cbf720SGianluca Guida * notice, this list of conditions and the following disclaimer. 12b6cbf720SGianluca Guida * 2. Redistributions in binary form must reproduce the above copyright 13b6cbf720SGianluca Guida * notice, this list of conditions and the following disclaimer in the 14b6cbf720SGianluca Guida * documentation and/or other materials provided with the distribution. 15b6cbf720SGianluca Guida * 3. The name of the company may not be used to endorse or promote 16b6cbf720SGianluca Guida * products derived from this software without specific prior written 17b6cbf720SGianluca Guida * permission. 18b6cbf720SGianluca Guida * 19b6cbf720SGianluca Guida * THIS SOFTWARE IS PROVIDED BY ARM LTD ``AS IS'' AND ANY EXPRESS OR IMPLIED 20b6cbf720SGianluca Guida * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 21b6cbf720SGianluca Guida * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22b6cbf720SGianluca Guida * IN NO EVENT SHALL ARM LTD BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23b6cbf720SGianluca Guida * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 24b6cbf720SGianluca Guida * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 25b6cbf720SGianluca Guida * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 26b6cbf720SGianluca Guida * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 27b6cbf720SGianluca Guida * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 28b6cbf720SGianluca Guida * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29b6cbf720SGianluca Guida */ 30b6cbf720SGianluca Guida 31b6cbf720SGianluca Guida#include <machine/asm.h> 32b6cbf720SGianluca Guida 33*84d9c625SLionel SambucRCSID("$NetBSD: strncmp.S,v 1.2 2013/08/19 00:57:25 matt Exp $") 34b6cbf720SGianluca Guida 35b6cbf720SGianluca GuidaENTRY(strncmp) 36b6cbf720SGianluca Guida/* if ((len - 1) < 0) return 0 */ 37b6cbf720SGianluca Guida subs r2, r2, #1 38*84d9c625SLionel Sambuc#ifdef __thumb__ 39*84d9c625SLionel Sambuc bmi 5f 40*84d9c625SLionel Sambuc#else 41b6cbf720SGianluca Guida movmi r0, #0 42b6cbf720SGianluca Guida RETc(mi) 43*84d9c625SLionel Sambuc#endif 44b6cbf720SGianluca Guida 45b6cbf720SGianluca Guida/* ip == last src address to compare */ 46*84d9c625SLionel Sambuc#ifdef __thumb__ 47*84d9c625SLionel Sambuc adds r3, r0, r2 48*84d9c625SLionel Sambuc mov ip, r3 49*84d9c625SLionel Sambuc subs r1, r1, r0 50*84d9c625SLionel Sambuc#else 51b6cbf720SGianluca Guida add ip, r0, r2 52*84d9c625SLionel Sambuc#endif 53b6cbf720SGianluca Guida1: 54*84d9c625SLionel Sambuc#ifdef __thumb__ 55*84d9c625SLionel Sambuc ldrb r2, [r0] 56*84d9c625SLionel Sambuc ldrb r3, [r1, r0] 57*84d9c625SLionel Sambuc adds r0, r0, #1 58*84d9c625SLionel Sambuc cmp ip, r0 /* exhausted length? */ 59*84d9c625SLionel Sambuc bcc 4f /* yes, we're done */ 60*84d9c625SLionel Sambuc cmp r2, #1 /* NUL? */ 61*84d9c625SLionel Sambuc bcc 4f /* yes, we're done */ 62*84d9c625SLionel Sambuc cmp r2, r3 /* different? */ 63*84d9c625SLionel Sambuc#else 64b6cbf720SGianluca Guida ldrb r2, [r0], #1 65b6cbf720SGianluca Guida ldrb r3, [r1], #1 66b6cbf720SGianluca Guida cmp ip, r0 67b6cbf720SGianluca Guida cmpcs r2, #1 68b6cbf720SGianluca Guida cmpcs r2, r3 69*84d9c625SLionel Sambuc#endif 70b6cbf720SGianluca Guida beq 1b 71*84d9c625SLionel Sambuc4: subs r0, r2, r3 72b6cbf720SGianluca Guida RET 73*84d9c625SLionel Sambuc#ifdef __thumb__ 74*84d9c625SLionel Sambuc5: movs r0, #0 75*84d9c625SLionel Sambuc RET 76*84d9c625SLionel Sambuc#endif 77*84d9c625SLionel SambucEND(strncmp) 78