57 lines
1.5 KiB
ArmAsm
57 lines
1.5 KiB
ArmAsm
/* memset with REP MOVSB/STOSB
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Copyright (C) 2015-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#define CFI_PUSH(REG) \
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cfi_adjust_cfa_offset (4); \
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cfi_rel_offset (REG, 0)
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#define CFI_POP(REG) \
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cfi_adjust_cfa_offset (-4); \
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cfi_restore (REG)
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#define PUSH(REG) pushl REG; CFI_PUSH (REG)
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#define POP(REG) popl REG; CFI_POP (REG)
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#define STR1 8
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#define STR2 STR1+4
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#define N STR2+4
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.text
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#if defined SHARED && IS_IN (libc)
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ENTRY (__memset_chk)
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movl 12(%esp), %eax
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cmpl %eax, 16(%esp)
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jb HIDDEN_JUMPTARGET (__chk_fail)
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END (__memset_chk)
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#endif
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ENTRY (memset)
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PUSH (%edi)
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movl N(%esp), %ecx
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movl STR1(%esp), %edi
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movzbl STR2(%esp), %eax
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mov %edi, %edx
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rep stosb
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mov %edx, %eax
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POP (%edi)
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ret
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END (memset)
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libc_hidden_builtin_def (memset)
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