84d9c625bf
- Fix for possible unset uid/gid in toproto
- Fix for default mtree style
- Update libelf
- Importing libexecinfo
- Resynchronize GCC, mpc, gmp, mpfr
- build.sh: Replace params with show-params.
This has been done as the make target has been renamed in the same
way, while a new target named params has been added. This new
target generates a file containing all the parameters, instead of
printing it on the console.
- Update test48 with new etc/services (Fix by Ben Gras <ben@minix3.org)
get getservbyport() out of the inner loop
Change-Id: Ie6ad5226fa2621ff9f0dee8782ea48f9443d2091
162 lines
6 KiB
ArmAsm
162 lines
6 KiB
ArmAsm
/*-
|
|
* Copyright (c) 2013 The NetBSD Foundation, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to The NetBSD Foundation
|
|
* by Matt Thomas of 3am Software Foundry.
|
|
*
|
|
* 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.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
|
|
* ``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 THE FOUNDATION OR CONTRIBUTORS
|
|
* 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.
|
|
*/
|
|
|
|
#include <machine/asm.h>
|
|
|
|
RCSID("$NetBSD: strrchr_arm.S,v 1.6 2013/08/25 06:15:06 matt Exp $")
|
|
|
|
#ifdef __ARMEL__
|
|
#define BYTE0 0x000000ff
|
|
#define BYTE1 0x0000ff00
|
|
#define BYTE2 0x00ff0000
|
|
#define BYTE3 0xff000000
|
|
#define lshi lsl
|
|
#define lshis lsls
|
|
#else
|
|
#define BYTE0 0xff000000
|
|
#define BYTE1 0x00ff0000
|
|
#define BYTE2 0x0000ff00
|
|
#define BYTE3 0x000000ff
|
|
#define lshi lsr
|
|
#define lshis lsrs
|
|
#endif
|
|
|
|
ENTRY(strrchr)
|
|
ands r2, r1, #0xff /* is the byte value NUL? */
|
|
bne 1f /* no, do it the hard way */
|
|
push {r0, lr} /* save pointer and return addr */
|
|
bl PLT_SYM(strlen) /* get length */
|
|
pop {r1, r2} /* restore pointer / return addr */
|
|
adds r0, r0, r1 /* add pointer to length */
|
|
RETr(r2) /* return */
|
|
|
|
1: mov r1, r0 /* we use r0 at the return value */
|
|
movs r0, #0 /* return NULL by default */
|
|
2: tst r1, #3 /* test for word alignment */
|
|
beq .Lpre_main_loop /* finally word aligned */
|
|
ldrb r3, [r1], #1 /* load a byte */
|
|
cmp r3, r2 /* did it match? */
|
|
#ifdef __thumb__
|
|
it eq
|
|
#endif
|
|
subeq r0, r1, #1 /* yes, remember that it did */
|
|
cmp r3, #0 /* was it NUL? */
|
|
bne 2b /* no, try next byte */
|
|
RET /* return */
|
|
.Lpre_main_loop:
|
|
push {r4, r5} /* save some registers */
|
|
#if defined(_ARM_ARCH_7)
|
|
movw ip, #0xfefe /* magic constant; 254 in each byte */
|
|
movt ip, #0xfefe /* magic constant; 254 in each byte */
|
|
#elif defined(_ARM_ARCH_6)
|
|
mov ip, #0xfe /* put 254 in low byte */
|
|
orr ip, ip, ip, lsl #8 /* move to next byte */
|
|
orr ip, ip, ip, lsl #16 /* move to next halfword */
|
|
#endif /* _ARM_ARCH_6 */
|
|
orr r2, r2, r2, lsl #8 /* move to next byte */
|
|
orr r2, r2, r2, lsl #16 /* move to next halfword */
|
|
.Lmain_loop:
|
|
ldr r3, [r1], #4 /* load next word */
|
|
#if defined(_ARM_ARCH_6)
|
|
/*
|
|
* Add 254 to each byte using the UQADD8 (unsigned saturating add 8)
|
|
* instruction. For every non-NUL byte, the result for that byte will
|
|
* become 255. For NUL, it will be 254. When we complement the
|
|
* result, if the result is non-0 then we must have encountered a NUL.
|
|
*/
|
|
uqadd8 r4, r3, ip /* NUL detection happens here */
|
|
usub8 r3, r3, r2 /* bias for char looked for? */
|
|
uqadd8 r5, r3, ip /* char detection happens here */
|
|
ands r3, r4, r5 /* merge results */
|
|
mvns r3, r3 /* is the complement non-0? */
|
|
beq .Lmain_loop /* no, then keep going */
|
|
|
|
mvns r5, r5 /* get we find any matching bytes? */
|
|
beq .Ldone /* no, then we hit the end, return */
|
|
mvns r4, r4 /* did we encounter a NUL? */
|
|
beq .Lfind_match /* no, find matching byte */
|
|
/*
|
|
* Copy the NUL bit to the following byte lanes. Then clear any match
|
|
* bits in those byte lanes to prevent false positives in those bytes.
|
|
*/
|
|
bics r5, r5, r4 /* clear any NUL match bits */
|
|
beq .Ldone /* no remaining matches, we're done */
|
|
lshis r3, r4, #8 /* shift up a byte */
|
|
#ifdef __thumb__
|
|
itt ne
|
|
#endif
|
|
orrsne r3, r3, r3, lshi #8 /* if non 0, copy up to next byte */
|
|
orrsne r3, r3, r3, lshi #8 /* if non 0, copy up to last byte */
|
|
bics r5, r5, r3 /* clear match bits */
|
|
beq .Ldone /* no remaining matches, we're done */
|
|
.Lfind_match:
|
|
#ifdef __ARMEL__
|
|
rev r5, r5 /* we want this in BE for the CLZ */
|
|
#endif
|
|
/*
|
|
* If we have multiple matches, we want to the select the "last" match
|
|
* in the word which will be the lowest bit set.
|
|
*/
|
|
subs r3, r5, #1 /* subtract 1 */
|
|
ands r3, r3, r5 /* and with mask */
|
|
eors r5, r5, r3 /* only have the lowest bit set left */
|
|
clz r5, r5 /* count how many leading zeros */
|
|
add r0, r1, r5, lsr #3 /* divide that by 8 and add to count */
|
|
subs r0, r0, #4 /* compensate for the post-inc */
|
|
cmp r4, #0 /* did we read any NULs? */
|
|
beq .Lmain_loop /* no, get next word */
|
|
#else
|
|
/*
|
|
* No fancy shortcuts so just test each byte lane for a NUL.
|
|
* (other tests for NULs in a word take more instructions/cycles).
|
|
*/
|
|
eor r4, r3, r2 /* xor .. */
|
|
tst r3, #BYTE0 /* is byte 0 a NUL? */
|
|
beq .Ldone /* yes, then we're done */
|
|
tst r4, #BYTE0 /* is byte 0 a match? */
|
|
subeq r0, r1, #4 /* yes, remember its location */
|
|
tst r3, #BYTE1 /* is byte 1 a NUL? */
|
|
beq .Ldone /* yes, then we're done */
|
|
tst r4, #BYTE1 /* is byte 1 a match? */
|
|
subeq r0, r1, #3 /* yes, remember its location */
|
|
tst r3, #BYTE2 /* is byte 2 a NUL? */
|
|
beq .Ldone /* yes, then we're done */
|
|
tst r4, #BYTE2 /* is byte 2 a match? */
|
|
subeq r0, r1, #2 /* yes, remember its location */
|
|
tst r3, #BYTE3 /* is byte 3 a NUL? */
|
|
beq .Ldone /* yes, then we're done */
|
|
tst r4, #BYTE3 /* is byte 3 a match? */
|
|
subeq r0, r1, #1 /* yes, remember its location */
|
|
b .Lmain_loop
|
|
#endif /* _ARM_ARCH_6 */
|
|
.Ldone:
|
|
pop {r4, r5}
|
|
RET
|
|
END(strrchr)
|