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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>
197 lines
3.8 KiB
ArmAsm
197 lines
3.8 KiB
ArmAsm
/* Copyright (C) 1999-2021 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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#include <sysdep.h>
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/* void *memcpy(void *dst, const void *src, size_t n);
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No overlap between the memory of DST and of SRC are assumed. */
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ENTRY(memcpy)
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mov r4,r3 /* Save destination. */
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/* If less than 11 bytes, just do a byte copy. */
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mov #11,r0
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cmp/gt r6,r0
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bt L_byteloop_init
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/* Check if we need to word-align source. */
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mov r5,r0
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tst #1,r0
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bt L_wordalign
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mov.b @r0+,r1 /* Copy one byte. */
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add #-1,r6
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mov.b r1,@r4
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add #1,r4
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.balignw 4,0x0009
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L_wordalign:
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/* Check if we need to longword-align source. */
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tst #2,r0
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bt L_copy
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mov.w @r0+,r1 /* Copy one word. */
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add #-2,r6
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#ifdef __BIG_ENDIAN__
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add #1,r4
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mov.b r1,@r4
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shlr8 r1
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mov.b r1,@-r4
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add #2,r4
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#else
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mov.b r1,@r4
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add #1,r4
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shlr8 r1
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mov.b r1,@r4
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add #1,r4
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#endif
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L_copy:
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mov r0,r5
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/* Calculate the correct routine to handle the destination
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alignment and simultaneously calculate the loop counts for
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both the 2 word copy loop and byte copy loop. */
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mova L_jumptable,r0
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mov r0,r1
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mov r4,r0
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mov r6,r7
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and #3,r0
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shlr2 r7
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shll r0
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shlr r7
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mov.w @(r0,r1),r2
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mov #7,r0
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braf r2
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and r0,r6
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L_base:
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.balign 4
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L_jumptable:
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.word L_copydest0 - L_base
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.word L_copydest1_or_3 - L_base
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.word L_copydest2 - L_base
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.word L_copydest1_or_3 - L_base
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.balign 4
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/* Copy routine for (dest mod 4) == 1 or == 3. */
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L_copydest1_or_3:
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add #-1,r4
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.balignw 4,0x0009
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L_copydest1_or_3_loop:
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mov.l @r5+,r0 /* Read first longword. */
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dt r7
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mov.l @r5+,r1 /* Read second longword. */
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#ifdef __BIG_ENDIAN__
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/* Write first longword as byte, word, byte. */
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mov.b r0,@(4,r4)
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shlr8 r0
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mov.w r0,@(2,r4)
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shlr16 r0
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mov.b r0,@(1,r4)
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mov r1,r0
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/* Write second longword as byte, word, byte. */
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mov.b r0,@(8,r4)
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shlr8 r0
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mov.w r0,@(6,r4)
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shlr16 r0
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mov.b r0,@(5,r4)
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#else
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/* Write first longword as byte, word, byte. */
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mov.b r0,@(1,r4)
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shlr8 r0
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mov.w r0,@(2,r4)
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shlr16 r0
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mov.b r0,@(4,r4)
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mov r1,r0
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/* Write second longword as byte, word, byte. */
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mov.b r0,@(5,r4)
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shlr8 r0
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mov.w r0,@(6,r4)
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shlr16 r0
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mov.b r0,@(8,r4)
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#endif
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bf/s L_copydest1_or_3_loop
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add #8,r4
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bra L_byteloop_init
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add #1,r4
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.balign 4
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/* Copy routine for (dest mod 4) == 2. */
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L_copydest2:
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L_copydest2_loop:
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mov.l @r5+,r0
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dt r7
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mov.l @r5+,r1
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#ifdef __BIG_ENDIAN__
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mov.w r0,@(2,r4)
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shlr16 r0
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mov.w r0,@r4
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mov r1,r0
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mov.w r0,@(6,r4)
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shlr16 r0
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mov.w r0,@(4,r4)
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#else
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mov.w r0,@r4
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shlr16 r0
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mov.w r0,@(2,r4)
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mov r1,r0
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mov.w r0,@(4,r4)
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shlr16 r0
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mov.w r0,@(6,r4)
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#endif
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bf/s L_copydest2_loop
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add #8,r4
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bra L_byteloop_init
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nop
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.balign 4
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/* Copy routine for (dest mod 4) == 0. */
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L_copydest0:
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add #-8,r4
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.balignw 4,0x0009
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L_copydest0_loop:
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mov.l @r5+,r0
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dt r7
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mov.l @r5+,r1
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add #8,r4
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mov.l r0,@r4
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bf/s L_copydest0_loop
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mov.l r1,@(4,r4)
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add #8,r4 /* Fall through. */
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L_byteloop_init:
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tst r6,r6
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bt L_exit
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.balignw 4,0x0009
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/* Copy remaining bytes. */
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L_byteloop:
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mov.b @r5+,r0
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dt r6
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mov.b r0,@r4
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bf/s L_byteloop
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add #1,r4
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L_exit:
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rts
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mov r3,r0 /* Return destination. */
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END(memcpy)
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libc_hidden_builtin_def (memcpy)
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