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- /* memset with REP MOVSB/STOSB
- Copyright (C) 2015-2026 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>
- #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
- #define STR2 STR1+4
- #define N STR2+4
- .text
- #if defined SHARED && IS_IN (libc)
- ENTRY (__memset_chk)
- movl 12(%esp), %eax
- cmpl %eax, 16(%esp)
- jb HIDDEN_JUMPTARGET (__chk_fail)
- END (__memset_chk)
- libc_hidden_builtin_def (__memset_chk)
- #endif
- ENTRY (memset)
- PUSH (%edi)
- movl N(%esp), %ecx
- movl STR1(%esp), %edi
- movzbl STR2(%esp), %eax
- mov %edi, %edx
- rep stosb
- mov %edx, %eax
- POP (%edi)
- ret
- END (memset)
- libc_hidden_builtin_def (memset)
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