1 | /* Copy memory block and return pointer to following byte. |
2 | For Intel 80x86, x>=6. |
3 | This file is part of the GNU C Library. |
4 | Copyright (C) 1998-2024 Free Software Foundation, Inc. |
5 | |
6 | The GNU C Library is free software; you can redistribute it and/or |
7 | modify it under the terms of the GNU Lesser General Public |
8 | License as published by the Free Software Foundation; either |
9 | version 2.1 of the License, or (at your option) any later version. |
10 | |
11 | The GNU C Library is distributed in the hope that it will be useful, |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
14 | Lesser General Public License for more details. |
15 | |
16 | You should have received a copy of the GNU Lesser General Public |
17 | License along with the GNU C Library; if not, see |
18 | <https://www.gnu.org/licenses/>. */ |
19 | |
20 | #include <sysdep.h> |
21 | #include "asm-syntax.h" |
22 | |
23 | #define PARMS 4 /* no space for saved regs */ |
24 | #define RTN PARMS |
25 | #define DEST RTN |
26 | #define SRC DEST+4 |
27 | #define LEN SRC+4 |
28 | |
29 | .text |
30 | #if defined SHARED && IS_IN (libc) |
31 | ENTRY_CHK (__mempcpy_chk) |
32 | movl 12(%esp), %eax |
33 | cmpl %eax, 16(%esp) |
34 | jb HIDDEN_JUMPTARGET (__chk_fail) |
35 | END_CHK (__mempcpy_chk) |
36 | libc_hidden_builtin_def (__mempcpy_chk) |
37 | #endif |
38 | ENTRY (__mempcpy) |
39 | |
40 | movl LEN(%esp), %ecx |
41 | movl %edi, %eax |
42 | cfi_register (edi, eax) |
43 | movl DEST(%esp), %edi |
44 | movl %esi, %edx |
45 | cfi_register (esi, edx) |
46 | movl SRC(%esp), %esi |
47 | cld |
48 | shrl $1, %ecx |
49 | jnc 1f |
50 | movsb |
51 | 1: shrl $1, %ecx |
52 | jnc 2f |
53 | movsw |
54 | 2: rep |
55 | movsl |
56 | xchgl %edi, %eax |
57 | cfi_restore (edi) |
58 | movl %edx, %esi |
59 | cfi_restore (esi) |
60 | |
61 | ret |
62 | END (__mempcpy) |
63 | libc_hidden_def (__mempcpy) |
64 | weak_alias (__mempcpy, mempcpy) |
65 | libc_hidden_builtin_def (mempcpy) |
66 | |