31489a9a26
For setjmp() and longjmp(), put the signal mask where it's supposed to be, instead of in the space reserved for fp regs.
181 lines
6.0 KiB
ArmAsm
181 lines
6.0 KiB
ArmAsm
/* $NetBSD: memcmp.S,v 1.3 2003/10/14 07:51:45 scw Exp $ */
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/*
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* Copyright 2003 Wasabi Systems, Inc.
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* All rights reserved.
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*
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* Written by Steve C. Woodford for Wasabi Systems, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed for the NetBSD Project by
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* Wasabi Systems, Inc.
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* 4. The name of Wasabi Systems, Inc. may not be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Copyright (c) 2002 ARM Ltd
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the company may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY ARM LTD ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL ARM LTD BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <machine/asm.h>
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__FBSDID("$FreeBSD$");
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ENTRY(memcmp)
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mov ip, r0
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#if defined(_KERNEL) && !defined(_STANDALONE)
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cmp r2, #0x06
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beq .Lmemcmp_6bytes
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#endif
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mov r0, #0x00
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/* Are both addresses aligned the same way? */
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cmp r2, #0x00
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eornes r3, ip, r1
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RETeq /* len == 0, or same addresses! */
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tst r3, #0x03
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subne r2, r2, #0x01
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bne .Lmemcmp_bytewise2 /* Badly aligned. Do it the slow way */
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/* Word-align the addresses, if necessary */
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sub r3, r1, #0x05
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ands r3, r3, #0x03
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add r3, r3, r3, lsl #1
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addne pc, pc, r3, lsl #3
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nop
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/* Compare up to 3 bytes */
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ldrb r0, [ip], #0x01
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ldrb r3, [r1], #0x01
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subs r0, r0, r3
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RETne
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subs r2, r2, #0x01
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RETeq
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/* Compare up to 2 bytes */
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ldrb r0, [ip], #0x01
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ldrb r3, [r1], #0x01
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subs r0, r0, r3
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RETne
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subs r2, r2, #0x01
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RETeq
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/* Compare 1 byte */
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ldrb r0, [ip], #0x01
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ldrb r3, [r1], #0x01
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subs r0, r0, r3
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RETne
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subs r2, r2, #0x01
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RETeq
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/* Compare 4 bytes at a time, if possible */
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subs r2, r2, #0x04
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bcc .Lmemcmp_bytewise
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.Lmemcmp_word_aligned:
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ldr r0, [ip], #0x04
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ldr r3, [r1], #0x04
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subs r2, r2, #0x04
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cmpcs r0, r3
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beq .Lmemcmp_word_aligned
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sub r0, r0, r3
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/* Correct for extra subtraction, and check if done */
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adds r2, r2, #0x04
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cmpeq r0, #0x00 /* If done, did all bytes match? */
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RETeq /* Yup. Just return */
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/* Re-do the final word byte-wise */
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sub ip, ip, #0x04
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sub r1, r1, #0x04
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.Lmemcmp_bytewise:
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add r2, r2, #0x03
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.Lmemcmp_bytewise2:
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ldrb r0, [ip], #0x01
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ldrb r3, [r1], #0x01
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subs r2, r2, #0x01
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cmpcs r0, r3
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beq .Lmemcmp_bytewise2
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sub r0, r0, r3
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RET
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#if defined(_KERNEL) && !defined(_STANDALONE)
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/*
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* 6 byte compares are very common, thanks to the network stack.
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* This code is hand-scheduled to reduce the number of stalls for
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* load results. Everything else being equal, this will be ~32%
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* faster than a byte-wise memcmp.
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*/
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.align 5
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.Lmemcmp_6bytes:
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ldrb r3, [r1, #0x00] /* r3 = b2#0 */
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ldrb r0, [ip, #0x00] /* r0 = b1#0 */
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ldrb r2, [r1, #0x01] /* r2 = b2#1 */
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subs r0, r0, r3 /* r0 = b1#0 - b2#0 */
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ldreqb r3, [ip, #0x01] /* r3 = b1#1 */
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RETne /* Return if mismatch on #0 */
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subs r0, r3, r2 /* r0 = b1#1 - b2#1 */
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ldreqb r3, [r1, #0x02] /* r3 = b2#2 */
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ldreqb r0, [ip, #0x02] /* r0 = b1#2 */
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RETne /* Return if mismatch on #1 */
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ldrb r2, [r1, #0x03] /* r2 = b2#3 */
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subs r0, r0, r3 /* r0 = b1#2 - b2#2 */
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ldreqb r3, [ip, #0x03] /* r3 = b1#3 */
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RETne /* Return if mismatch on #2 */
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subs r0, r3, r2 /* r0 = b1#3 - b2#3 */
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ldreqb r3, [r1, #0x04] /* r3 = b2#4 */
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ldreqb r0, [ip, #0x04] /* r0 = b1#4 */
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RETne /* Return if mismatch on #3 */
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ldrb r2, [r1, #0x05] /* r2 = b2#5 */
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subs r0, r0, r3 /* r0 = b1#4 - b2#4 */
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ldreqb r3, [ip, #0x05] /* r3 = b1#5 */
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RETne /* Return if mismatch on #4 */
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sub r0, r3, r2 /* r0 = b1#5 - b2#5 */
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RET
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#endif
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