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c6bfe5c4d7
I've moved the ARM port from ports to the main sysdeps hierarchy. Beyond the README update, the move of the files was simply git mv ports/sysdeps/arm sysdeps/arm git mv ports/sysdeps/unix/arm sysdeps/unix/arm git mv ports/sysdeps/unix/sysv/linux/arm sysdeps/unix/sysv/linux/arm and in addition to the ChangeLog entries here, I put a note at the top of ports/ChangeLog.arm similar to that at the top of ChangeLog.powerpc. There is deliberately no NEWS change, as I think it makes the most sense to put in a general note above all ports having moved if we can achieve that for 2.20. Tested that disassembly of installed shared libraries for arm is the same before and after this patch, except for data (not instructions) in ld.so (there are assertions in sysdeps/arm/dl-machine.h, and the path by which that file is found, and so by which it appears in the assertion message, changes as a result of the move). * sysdeps/arm: Move directory from ports/sysdeps/arm. * sysdeps/unix/arm: Move directory from ports/sysdeps/unix/arm. * sysdeps/unix/sysv/linux/arm: Move directory from ports/sysdeps/unix/sysv/linux/arm. * README: Update listing for arm-*-linux-gnueabi. ports/ChangeLog.arm: * sysdeps/arm: Move directory to ../sysdeps/arm. * sysdeps/unix/arm: Move directory to ../sysdeps.arm. * sysdeps/unix/sysv/linux/arm: Move directory to ../sysdeps/unix/sysv/linux/arm.
80 lines
3.1 KiB
ArmAsm
80 lines
3.1 KiB
ArmAsm
/* Copyright (C) 1998-2014 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Code contributed by Matthew Wilcox <willy@odie.barnet.ac.uk>
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<http://www.gnu.org/licenses/>. */
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/* Thumb requires excessive IT insns here. */
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#define NO_THUMB
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#include <sysdep.h>
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/* size_t strlen(const char *S)
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* entry: r0 -> string
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* exit: r0 = len
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*/
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.syntax unified
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.text
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ENTRY(strlen)
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bic r1, r0, $3 @ addr of word containing first byte
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sfi_breg r1, \
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ldr r2, [\B], $4 @ get the first word
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ands r3, r0, $3 @ how many bytes are duff?
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rsb r0, r3, $0 @ get - that number into counter.
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beq Laligned @ skip into main check routine if no
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@ more
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#ifdef __ARMEB__
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orr r2, r2, $0xff000000 @ set this byte to non-zero
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subs r3, r3, $1 @ any more to do?
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orrgt r2, r2, $0x00ff0000 @ if so, set this byte
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subs r3, r3, $1 @ more?
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orrgt r2, r2, $0x0000ff00 @ then set.
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#else
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orr r2, r2, $0x000000ff @ set this byte to non-zero
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subs r3, r3, $1 @ any more to do?
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orrgt r2, r2, $0x0000ff00 @ if so, set this byte
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subs r3, r3, $1 @ more?
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orrgt r2, r2, $0x00ff0000 @ then set.
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#endif
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Laligned: @ here, we have a word in r2. Does it
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tst r2, $0x000000ff @ contain any zeroes?
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tstne r2, $0x0000ff00 @
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tstne r2, $0x00ff0000 @
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tstne r2, $0xff000000 @
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addne r0, r0, $4 @ if not, the string is 4 bytes longer
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sfi_breg r1, \
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ldrne r2, [\B], $4 @ and we continue to the next word
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bne Laligned @
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Llastword: @ drop through to here once we find a
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#ifdef __ARMEB__
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tst r2, $0xff000000 @ word that has a zero byte in it
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addne r0, r0, $1 @
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tstne r2, $0x00ff0000 @ and add up to 3 bytes on to it
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addne r0, r0, $1 @
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tstne r2, $0x0000ff00 @ (if first three all non-zero, 4th
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addne r0, r0, $1 @ must be zero)
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#else
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tst r2, $0x000000ff @ word that has a zero byte in it
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addne r0, r0, $1 @
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tstne r2, $0x0000ff00 @ and add up to 3 bytes on to it
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addne r0, r0, $1 @
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tstne r2, $0x00ff0000 @ (if first three all non-zero, 4th
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addne r0, r0, $1 @ must be zero)
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#endif
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DO_RET(lr)
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END(strlen)
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libc_hidden_builtin_def (strlen)
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