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d226114b | 1 | /* memset with REP MOVSB/STOSB |
04277e02 | 2 | Copyright (C) 2015-2019 Free Software Foundation, Inc. |
d226114b L |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
d226114b L |
18 | |
19 | #include <sysdep.h> | |
20 | ||
21 | #define CFI_PUSH(REG) \ | |
22 | cfi_adjust_cfa_offset (4); \ | |
23 | cfi_rel_offset (REG, 0) | |
24 | ||
25 | #define CFI_POP(REG) \ | |
26 | cfi_adjust_cfa_offset (-4); \ | |
27 | cfi_restore (REG) | |
28 | ||
29 | #define PUSH(REG) pushl REG; CFI_PUSH (REG) | |
30 | #define POP(REG) popl REG; CFI_POP (REG) | |
31 | ||
32 | #define STR1 8 | |
33 | #ifdef USE_AS_BZERO | |
34 | #define N STR1+4 | |
35 | #else | |
36 | #define STR2 STR1+4 | |
37 | #define N STR2+4 | |
38 | #endif | |
39 | ||
40 | .text | |
41 | #if defined SHARED && IS_IN (libc) && !defined USE_AS_BZERO | |
42 | ENTRY (__memset_chk) | |
43 | movl 12(%esp), %eax | |
44 | cmpl %eax, 16(%esp) | |
45 | jb HIDDEN_JUMPTARGET (__chk_fail) | |
46 | END (__memset_chk) | |
47 | #endif | |
48 | ENTRY (memset) | |
49 | PUSH (%edi) | |
50 | movl N(%esp), %ecx | |
51 | movl STR1(%esp), %edi | |
52 | #ifdef USE_AS_BZERO | |
53 | xor %eax, %eax | |
54 | #else | |
55 | movzbl STR2(%esp), %eax | |
56 | mov %edi, %edx | |
57 | #endif | |
58 | rep stosb | |
59 | #ifndef USE_AS_BZERO | |
60 | mov %edx, %eax | |
61 | #endif | |
62 | POP (%edi) | |
63 | ret | |
64 | END (memset) | |
65 | ||
66 | #ifndef USE_AS_BZERO | |
67 | libc_hidden_builtin_def (memset) | |
68 | #endif |