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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>
106 lines
2.8 KiB
ArmAsm
106 lines
2.8 KiB
ArmAsm
/* Copyright (C) 1996-2021 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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/* Copy no more than COUNT bytes of the null-terminated string from
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SRC to DST. If SRC does not cover all of COUNT, the balance is
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zeroed. Return the address of the terminating null in DEST, if
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any, else DEST + COUNT. */
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#include <sysdep.h>
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.set noat
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.set noreorder
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.text
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ENTRY(__stpncpy)
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ldgp gp, 0(pv)
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#ifdef PROF
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lda AT, _mcount
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jsr AT, (AT), _mcount
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#endif
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.prologue 1
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beq a2, $zerocount
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jsr t9, __stxncpy # do the work of the copy
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and t8, 0xf0, t3 # binary search for byte offset of the
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and t8, 0xcc, t2 # last byte written.
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and t8, 0xaa, t1
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andnot a0, 7, v0
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cmovne t3, 4, t3
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cmovne t2, 2, t2
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cmovne t1, 1, t1
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addq v0, t3, v0
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addq t1, t2, t1
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addq v0, t1, v0
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bne a2, $multiword # do we have full words left?
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.align 3
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zapnot t0, t8, t4 # e0 : was last byte a null?
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subq t8, 1, t2 # .. e1 :
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addq v0, 1, t5 # e0 :
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subq t10, 1, t3 # .. e1 :
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or t2, t8, t2 # e0 : clear the bits between the last
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or t3, t10, t3 # .. e1 : written byte and the last byte in
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andnot t3, t2, t3 # e0 : COUNT
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cmovne t4, t5, v0 # .. e1 : if last written wasnt null, inc v0
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zap t0, t3, t0 # e0 :
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stq_u t0, 0(a0) # e1 :
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ret # .. e1 :
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.align 3
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$multiword:
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subq t8, 1, t7 # e0 : clear the final bits in the prev
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or t7, t8, t7 # e1 : word
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zapnot t0, t7, t0 # e0 :
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subq a2, 1, a2 # .. e1 :
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stq_u t0, 0(a0) # e0 :
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addq a0, 8, a0 # .. e1 :
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beq a2, 1f # e1 :
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blbc a2, 0f # e1 :
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stq_u zero, 0(a0) # e0 : zero one word
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subq a2, 1, a2 # .. e1 :
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addq a0, 8, a0 # e0 :
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beq a2, 1f # .. e1 :
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0: stq_u zero, 0(a0) # e0 : zero two words
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subq a2, 2, a2 # .. e1 :
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stq_u zero, 8(a0) # e0 :
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addq a0, 16, a0 # .. e1 :
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bne a2, 0b # e1 :
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unop
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1: ldq_u t0, 0(a0) # e0 : clear the leading bits in the final
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subq t10, 1, t7 # .. e1 : word
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or t7, t10, t7 # e0 :
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zap t0, t7, t0 # e1 (stall)
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stq_u t0, 0(a0) # e0 :
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ret # .. e1 :
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$zerocount:
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mov a0, v0
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ret
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END(__stpncpy)
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libc_hidden_def (__stpncpy)
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weak_alias (__stpncpy, stpncpy)
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