mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-02 09:40:13 +00:00
99 lines
2.1 KiB
ArmAsm
99 lines
2.1 KiB
ArmAsm
/* Copy memory block and return pointer to beginning of destination block
|
|
For Intel 80x86, x>=6.
|
|
This file is part of the GNU C Library.
|
|
Copyright (C) 1999-2013 Free Software Foundation, Inc.
|
|
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1999.
|
|
|
|
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>
|
|
#include "asm-syntax.h"
|
|
|
|
#define PARMS 4 /* no space for saved regs */
|
|
#define RTN PARMS
|
|
#define DEST RTN
|
|
#define SRC DEST+4
|
|
#define LEN SRC+4
|
|
|
|
.text
|
|
#if defined PIC && !defined NOT_IN_libc
|
|
ENTRY_CHK (__memcpy_chk)
|
|
movl 12(%esp), %eax
|
|
cmpl %eax, 16(%esp)
|
|
jb HIDDEN_JUMPTARGET (__chk_fail)
|
|
END_CHK (__memcpy_chk)
|
|
#endif
|
|
ENTRY (memcpy)
|
|
|
|
movl %edi, %eax
|
|
movl DEST(%esp), %edi
|
|
movl %esi, %edx
|
|
movl SRC(%esp), %esi
|
|
|
|
movl %edi, %ecx
|
|
xorl %esi, %ecx
|
|
andl $3, %ecx
|
|
movl LEN(%esp), %ecx
|
|
cld
|
|
jne .Lunaligned
|
|
|
|
cmpl $3, %ecx
|
|
jbe .Lunaligned
|
|
|
|
testl $3, %esi
|
|
je 1f
|
|
movsb
|
|
decl %ecx
|
|
testl $3, %esi
|
|
je 1f
|
|
movsb
|
|
decl %ecx
|
|
testl $3, %esi
|
|
je 1f
|
|
movsb
|
|
decl %ecx
|
|
1: pushl %eax
|
|
movl %ecx, %eax
|
|
shrl $2, %ecx
|
|
andl $3, %eax
|
|
rep
|
|
movsl
|
|
movl %eax, %ecx
|
|
rep
|
|
movsb
|
|
popl %eax
|
|
|
|
.Lend: movl %eax, %edi
|
|
movl %edx, %esi
|
|
movl DEST(%esp), %eax
|
|
|
|
ret
|
|
|
|
/* When we come here the pointers do not have the same
|
|
alignment or the length is too short. No need to optimize for
|
|
aligned memory accesses. */
|
|
.Lunaligned:
|
|
shrl $1, %ecx
|
|
jnc 1f
|
|
movsb
|
|
1: shrl $1, %ecx
|
|
jnc 2f
|
|
movsw
|
|
2: rep
|
|
movsl
|
|
jmp .Lend
|
|
END (memcpy)
|
|
libc_hidden_builtin_def (memcpy)
|