| /* memset with REP MOVSB/STOSB |
| Copyright (C) 2015-2016 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 |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <sysdep.h> |
| |
| #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) |
| |
| #define STR1 8 |
| #ifdef USE_AS_BZERO |
| #define N STR1+4 |
| #else |
| #define STR2 STR1+4 |
| #define N STR2+4 |
| #endif |
| |
| .text |
| #if defined SHARED && IS_IN (libc) && !defined USE_AS_BZERO |
| ENTRY (__memset_chk) |
| movl 12(%esp), %eax |
| cmpl %eax, 16(%esp) |
| jb HIDDEN_JUMPTARGET (__chk_fail) |
| END (__memset_chk) |
| #endif |
| ENTRY (memset) |
| PUSH (%edi) |
| movl N(%esp), %ecx |
| movl STR1(%esp), %edi |
| #ifdef USE_AS_BZERO |
| xor %eax, %eax |
| #else |
| movzbl STR2(%esp), %eax |
| mov %edi, %edx |
| #endif |
| rep stosb |
| #ifndef USE_AS_BZERO |
| mov %edx, %eax |
| #endif |
| POP (%edi) |
| ret |
| END (memset) |
| |
| #ifndef USE_AS_BZERO |
| libc_hidden_builtin_def (memset) |
| #endif |