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30891f35fa
We stopped adding "Contributed by" or similar lines in sources in 2012 in favour of git logs and keeping the Contributors section of the glibc manual up to date. Removing these lines makes the license header a bit more consistent across files and also removes the possibility of error in attribution when license blocks or files are copied across since the contributed-by lines don't actually reflect reality in those cases. Move all "Contributed by" and similar lines (Written by, Test by, etc.) into a new file CONTRIBUTED-BY to retain record of these contributions. These contributors are also mentioned in manual/contrib.texi, so we just maintain this additional record as a courtesy to the earlier developers. The following scripts were used to filter a list of files to edit in place and to clean up the CONTRIBUTED-BY file respectively. These were not added to the glibc sources because they're not expected to be of any use in future given that this is a one time task: https://gist.github.com/siddhesh/b5ecac94eabfd72ed2916d6d8157e7dc https://gist.github.com/siddhesh/15ea1f5e435ace9774f485030695ee02 Reviewed-by: Carlos O'Donell <carlos@redhat.com>
77 lines
3.0 KiB
ArmAsm
77 lines
3.0 KiB
ArmAsm
/* Copyright (C) 1998-2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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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<https://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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ldr r2, [r1], $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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ldrne r2, [r1], $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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