| /* |
| * 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> |
| |
| .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 |