mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-29 08:11:08 +00:00
89 lines
1.9 KiB
ArmAsm
89 lines
1.9 KiB
ArmAsm
/* memcpy with REP MOVSB/STOSB
|
|
Copyright (C) 2015-2023 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
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"
|
|
|
|
#ifndef MEMCPY
|
|
# define MEMCPY memcpy
|
|
# define MEMCPY_CHK __memcpy_chk
|
|
#endif
|
|
|
|
#define STR1 12
|
|
#define STR2 STR1+4
|
|
#define N STR2+4
|
|
|
|
#define CFI_PUSH(REG) \
|
|
cfi_adjust_cfa_offset (4); \
|
|
cfi_rel_offset (REG, 0)
|
|
|
|
#define CFI_POP(REG) \
|
|
cfi_adjust_cfa_offset (-4); \
|
|
cfi_restore (REG)
|
|
|
|
#define PUSH(REG) pushl REG; CFI_PUSH (REG)
|
|
#define POP(REG) popl REG; CFI_POP (REG)
|
|
|
|
.text
|
|
#if defined SHARED && IS_IN (libc)
|
|
ENTRY (MEMCPY_CHK)
|
|
movl 12(%esp), %eax
|
|
cmpl %eax, 16(%esp)
|
|
jb HIDDEN_JUMPTARGET (__chk_fail)
|
|
END (MEMCPY_CHK)
|
|
libc_hidden_builtin_def (MEMCPY_CHK)
|
|
#endif
|
|
ENTRY (MEMCPY)
|
|
PUSH (%esi)
|
|
PUSH (%edi)
|
|
movl N(%esp), %ecx
|
|
movl STR1(%esp), %edi
|
|
movl STR2(%esp), %esi
|
|
mov %edi, %eax
|
|
#ifdef USE_AS_MEMPCPY
|
|
add %ecx, %eax
|
|
#endif
|
|
|
|
#ifdef USE_AS_MEMMOVE
|
|
cmp %esi, %edi
|
|
ja L(copy_backward)
|
|
je L(bwd_write_0bytes)
|
|
#endif
|
|
|
|
rep movsb
|
|
POP (%edi)
|
|
POP (%esi)
|
|
ret
|
|
|
|
#ifdef USE_AS_MEMMOVE
|
|
L(copy_backward):
|
|
lea -1(%edi,%ecx), %edi
|
|
lea -1(%esi,%ecx), %esi
|
|
std
|
|
rep movsb
|
|
cld
|
|
L(bwd_write_0bytes):
|
|
POP (%edi)
|
|
POP (%esi)
|
|
ret
|
|
#endif
|
|
|
|
END (MEMCPY)
|
|
|
|
libc_hidden_builtin_def (MEMCPY)
|