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/* 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) 2003-2023 Free Software Foundation, Inc.
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
<https://www.gnu.org/licenses/>. */
#include <sysdep.h>
#include "asm-syntax.h"
#define PARMS 4+4 /* one spilled register */
#define RTN PARMS
.text
#define DEST RTN
#define SRC DEST+4
#define LEN SRC+4
#if defined PIC && IS_IN (libc)
ENTRY_CHK (__memmove_chk)
movl 12(%esp), %eax
cmpl %eax, 16(%esp)
jb HIDDEN_JUMPTARGET (__chk_fail)
END_CHK (__memmove_chk)
libc_hidden_builtin_def (__memmove_chk)
#endif
ENTRY (memmove)
pushl %edi
cfi_adjust_cfa_offset (4)
movl LEN(%esp), %ecx
movl DEST(%esp), %edi
cfi_rel_offset (edi, 0)
movl %esi, %edx
movl SRC(%esp), %esi
cfi_register (esi, edx)
movl %edi, %eax
subl %esi, %eax
cmpl %eax, %ecx
ja 3f
cld
shrl $1, %ecx
jnc 1f
movsb
1: shrl $1, %ecx
jnc 2f
movsw
2: rep
movsl
movl %edx, %esi
cfi_restore (esi)
movl DEST(%esp), %eax
popl %edi
cfi_adjust_cfa_offset (-4)
cfi_restore (edi)
ret
cfi_adjust_cfa_offset (4)
cfi_rel_offset (edi, 0)
cfi_register (esi, edx)
/* Backward copying. */
3: std
leal -1(%edi, %ecx), %edi
leal -1(%esi, %ecx), %esi
shrl $1, %ecx
jnc 1f
movsb
1: subl $1, %edi
subl $1, %esi
shrl $1, %ecx
jnc 2f
movsw
2: subl $2, %edi
subl $2, %esi
rep
movsl
movl %edx, %esi
cfi_restore (esi)
movl DEST(%esp), %eax
cld
popl %edi
cfi_adjust_cfa_offset (-4)
cfi_restore (edi)
ret
END (memmove)
libc_hidden_builtin_def (memmove)
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