2015-08-27 16:04:40 +00:00
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/* memcpy with REP MOVSB/STOSB
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2018-01-01 00:32:25 +00:00
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Copyright (C) 2015-2018 Free Software Foundation, Inc.
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2015-08-27 16:04:40 +00:00
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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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<http://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#include "asm-syntax.h"
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#ifndef MEMCPY
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# define MEMCPY memcpy
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# define MEMCPY_CHK __memcpy_chk
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#endif
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#ifdef USE_AS_BCOPY
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# define STR2 12
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# define STR1 STR2+4
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# define N STR1+4
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#else
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# define STR1 12
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# define STR2 STR1+4
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# define N STR2+4
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#endif
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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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.text
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#if defined SHARED && IS_IN (libc) && !defined USE_AS_BCOPY
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ENTRY (MEMCPY_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 (MEMCPY_CHK)
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#endif
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ENTRY (MEMCPY)
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PUSH (%esi)
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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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movl STR2(%esp), %esi
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mov %edi, %eax
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#ifdef USE_AS_MEMPCPY
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add %ecx, %eax
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#endif
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#ifdef USE_AS_MEMMOVE
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cmp %esi, %edi
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ja L(copy_backward)
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je L(bwd_write_0bytes)
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#endif
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rep movsb
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POP (%edi)
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POP (%esi)
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ret
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#ifdef USE_AS_MEMMOVE
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L(copy_backward):
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lea -1(%edi,%ecx), %edi
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lea -1(%esi,%ecx), %esi
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std
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rep movsb
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cld
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L(bwd_write_0bytes):
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POP (%edi)
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POP (%esi)
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ret
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#endif
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END (MEMCPY)
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#ifndef USE_AS_BCOPY
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libc_hidden_builtin_def (MEMCPY)
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#endif
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