mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-12 06:10:10 +00:00
81cb7a0b2b
This semi-mechanical patch removes all uses and definitions of the sfi_breg, sfi_pld, and sfi_sp macros from various ARM-specific assembly files. These were only used by NaCl. * sysdeps/arm/sysdep.h (ARM_SFI_MACROS, sfi_breg, sfi_pld, sfi_sp): Delete definitions. * sysdeps/arm/__longjmp.S, sysdeps/arm/add_n.S * sysdeps/arm/addmul_1.S, sysdeps/arm/arm-mcount.S * sysdeps/arm/armv6/rawmemchr.S, sysdeps/arm/armv6/strchr.S * sysdeps/arm/armv6/strcpy.S, sysdeps/arm/armv6/strlen.S * sysdeps/arm/armv6/strrchr.S, sysdeps/arm/armv6t2/memchr.S * sysdeps/arm/armv6t2/strlen.S * sysdeps/arm/armv7/multiarch/memcpy_impl.S * sysdeps/arm/armv7/strcmp.S, sysdeps/arm/dl-tlsdesc.S * sysdeps/arm/memcpy.S, sysdeps/arm/memmove.S * sysdeps/arm/memset.S, sysdeps/arm/setjmp.S * sysdeps/arm/strlen.S, sysdeps/arm/submul_1.S: Remove all uses of sfi_breg, sfi_pld, and sfi_sp.
185 lines
5.2 KiB
ArmAsm
185 lines
5.2 KiB
ArmAsm
/* Copyright (C) 2011-2017 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Code contributed by Dave Gilbert <david.gilbert@linaro.org>
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library. If not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <sysdep.h>
|
|
|
|
@ This memchr routine is optimised on a Cortex-A9 and should work on all ARMv7
|
|
@ and ARMv6T2 processors. It has a fast path for short sizes, and has an
|
|
@ optimised path for large data sets; the worst case is finding the match early
|
|
@ in a large data set.
|
|
@ Note: The use of cbz/cbnz means it's Thumb only
|
|
|
|
@ 2011-07-15 david.gilbert@linaro.org
|
|
@ Copy from Cortex strings release 21 and change license
|
|
@ http://bazaar.launchpad.net/~linaro-toolchain-dev/cortex-strings/trunk/view/head:/src/linaro-a9/memchr.S
|
|
@ Change function declarations/entry/exit
|
|
@ 2011-12-01 david.gilbert@linaro.org
|
|
@ Add some fixes from comments received (including use of ldrd instead ldm)
|
|
@ 2011-12-07 david.gilbert@linaro.org
|
|
@ Removed cbz from align loop - can't be taken
|
|
|
|
@ this lets us check a flag in a 00/ff byte easily in either endianness
|
|
#ifdef __ARMEB__
|
|
#define CHARTSTMASK(c) 1<<(31-(c*8))
|
|
#else
|
|
#define CHARTSTMASK(c) 1<<(c*8)
|
|
#endif
|
|
.syntax unified
|
|
|
|
.text
|
|
#ifdef NO_THUMB
|
|
.arm
|
|
#else
|
|
.thumb
|
|
.thumb_func
|
|
#endif
|
|
.global memchr
|
|
.type memchr,%function
|
|
ENTRY(memchr)
|
|
@ r0 = start of memory to scan
|
|
@ r1 = character to look for
|
|
@ r2 = length
|
|
@ returns r0 = pointer to character or NULL if not found
|
|
and r1,r1,#0xff @ Don't think we can trust the caller to actually pass a char
|
|
|
|
cmp r2,#16 @ If it's short don't bother with anything clever
|
|
blt 20f
|
|
|
|
tst r0, #7 @ If it's already aligned skip the next bit
|
|
beq 10f
|
|
|
|
@ Work up to an aligned point
|
|
5:
|
|
ldrb r3, [r0],#1
|
|
subs r2, r2, #1
|
|
cmp r3, r1
|
|
beq 50f @ If it matches exit found
|
|
tst r0, #7
|
|
bne 5b @ If not aligned yet then do next byte
|
|
|
|
10:
|
|
@ At this point, we are aligned, we know we have at least 8 bytes to work with
|
|
push {r4,r5,r6,r7}
|
|
cfi_adjust_cfa_offset (16)
|
|
cfi_rel_offset (r4, 0)
|
|
cfi_rel_offset (r5, 4)
|
|
cfi_rel_offset (r6, 8)
|
|
cfi_rel_offset (r7, 12)
|
|
|
|
cfi_remember_state
|
|
|
|
orr r1, r1, r1, lsl #8 @ expand the match word across to all bytes
|
|
orr r1, r1, r1, lsl #16
|
|
bic r6, r2, #7 @ Number of double words to work with * 8
|
|
mvns r7, #0 @ all F's
|
|
movs r3, #0
|
|
|
|
15:
|
|
ldrd r4,r5, [r0],#8
|
|
#ifndef NO_THUMB
|
|
subs r6, r6, #8
|
|
#endif
|
|
eor r4,r4, r1 @ Get it so that r4,r5 have 00's where the bytes match the target
|
|
eor r5,r5, r1
|
|
uadd8 r4, r4, r7 @ Parallel add 0xff - sets the GE bits for anything that wasn't 0
|
|
sel r4, r3, r7 @ bytes are 00 for none-00 bytes, or ff for 00 bytes - NOTE INVERSION
|
|
uadd8 r5, r5, r7 @ Parallel add 0xff - sets the GE bits for anything that wasn't 0
|
|
sel r5, r4, r7 @ chained....bytes are 00 for none-00 bytes, or ff for 00 bytes - NOTE INVERSION
|
|
#ifndef NO_THUMB
|
|
cbnz r5, 60f
|
|
#else
|
|
cmp r5, #0
|
|
bne 60f
|
|
subs r6, r6, #8
|
|
#endif
|
|
bne 15b @ (Flags from the subs above) If not run out of bytes then go around again
|
|
|
|
pop {r4,r5,r6,r7}
|
|
cfi_adjust_cfa_offset (-16)
|
|
cfi_restore (r4)
|
|
cfi_restore (r5)
|
|
cfi_restore (r6)
|
|
cfi_restore (r7)
|
|
|
|
and r1,r1,#0xff @ Get r1 back to a single character from the expansion above
|
|
and r2,r2,#7 @ Leave the count remaining as the number after the double words have been done
|
|
|
|
20:
|
|
#ifndef NO_THUMB
|
|
cbz r2, 40f @ 0 length or hit the end already then not found
|
|
#else
|
|
cmp r2, #0
|
|
beq 40f
|
|
#endif
|
|
|
|
21: @ Post aligned section, or just a short call
|
|
ldrb r3,[r0],#1
|
|
#ifndef NO_THUMB
|
|
subs r2,r2,#1
|
|
eor r3,r3,r1 @ r3 = 0 if match - doesn't break flags from sub
|
|
cbz r3, 50f
|
|
#else
|
|
eors r3, r3, r1
|
|
beq 50f
|
|
subs r2, r2, #1
|
|
#endif
|
|
bne 21b @ on r2 flags
|
|
|
|
40:
|
|
movs r0,#0 @ not found
|
|
DO_RET(lr)
|
|
|
|
50:
|
|
subs r0,r0,#1 @ found
|
|
DO_RET(lr)
|
|
|
|
60: @ We're here because the fast path found a hit - now we have to track down exactly which word it was
|
|
@ r0 points to the start of the double word after the one that was tested
|
|
@ r4 has the 00/ff pattern for the first word, r5 has the chained value
|
|
cfi_restore_state
|
|
cmp r4, #0
|
|
itte eq
|
|
moveq r4, r5 @ the end is in the 2nd word
|
|
subeq r0,r0,#3 @ Points to 2nd byte of 2nd word
|
|
subne r0,r0,#7 @ or 2nd byte of 1st word
|
|
|
|
@ r0 currently points to the 2nd byte of the word containing the hit
|
|
tst r4, # CHARTSTMASK(0) @ 1st character
|
|
bne 61f
|
|
adds r0,r0,#1
|
|
tst r4, # CHARTSTMASK(1) @ 2nd character
|
|
ittt eq
|
|
addeq r0,r0,#1
|
|
tsteq r4, # (3<<15) @ 2nd & 3rd character
|
|
@ If not the 3rd must be the last one
|
|
addeq r0,r0,#1
|
|
|
|
61:
|
|
pop {r4,r5,r6,r7}
|
|
cfi_adjust_cfa_offset (-16)
|
|
cfi_restore (r4)
|
|
cfi_restore (r5)
|
|
cfi_restore (r6)
|
|
cfi_restore (r7)
|
|
|
|
subs r0,r0,#1
|
|
DO_RET(lr)
|
|
|
|
END(memchr)
|
|
libc_hidden_builtin_def (memchr)
|