/* * Copyright (c) 2002 ARM Ltd * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. 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. * 3. The name of the company may not be used to endorse or promote * products derived from this software without specific prior written * permission. * * THIS SOFTWARE IS PROVIDED BY ARM LTD ``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 ARM LTD 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. * * Adapted for uClibc from NetBSD memcmp.S, version 1.2 2003/04/05 * by Erik Andersen <andersen@codepoet.org> */ #include <features.h> #include <bits/arm_asm.h> #include <bits/arm_bx.h> .text .global memcmp .type memcmp,%function .align 4 #if defined(THUMB1_ONLY) .thumb_func memcmp: cmp r2, #0 bne 1f mov r0, #0 bx lr 1: push {r4} add r4, r0, r2 2: ldrb r2, [r0] add r0, r0, #1 ldrb r3, [r1] add r1, r1, #1 cmp r4, r0 beq 3f cmp r2, r3 beq 2b 3: sub r0, r2, r3 pop {r4} bx lr #else memcmp: /* if ((len - 1) < 0) return 0 */ subs r2, r2, #1 IT(tt, mi) movmi r0, #0 #if defined(__USE_BX__) bxmi lr #else movmi pc, lr #endif /* ip == last src address to compare */ add ip, r0, r2 1: ldrb r2, [r0], #1 ldrb r3, [r1], #1 cmp ip, r0 IT(t, cs) cmpcs r2, r3 beq 1b sub r0, r2, r3 #if defined(__USE_BX__) bx lr #else mov pc, lr #endif #endif .size memcmp,.-memcmp libc_hidden_def(memcmp) #ifdef __UCLIBC_SUSV3_LEGACY__ strong_alias(memcmp,bcmp) #endif