82 lines
2.1 KiB
ArmAsm
Executable File
82 lines
2.1 KiB
ArmAsm
Executable File
/* Copy memory block and return pointer to beginning of destination block
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For Intel 80x86, x>=6.
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This file is part of the GNU C Library.
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Copyright (C) 1999, 2000, 2003, 2004 Free Software Foundation, Inc.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1999.
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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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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# define CHECK_BOUNDS_BOTH_WIDE(VAL_REG, BP_MEM, LENGTH) \
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CHECK_BOUNDS_LOW(VAL_REG, BP_MEM); \
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addl LENGTH, VAL_REG; \
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cmpl 8+BP_MEM, VAL_REG; \
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jbe 0f; /* continue if value <= high */ \
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BOUNDS_VIOLATED; \
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0: subl LENGTH, VAL_REG /* restore value */
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# define RETURN_BOUNDED_POINTER(BP_MEM) \
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movl RTN(%esp), %edx; \
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movl %eax, 0(%edx); \
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movl 4+BP_MEM, %eax; \
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movl %eax, 4(%edx); \
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movl 8+BP_MEM, %eax; \
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movl %eax, 8(%edx)
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#define PTR_SIZE 12
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#define RTN_SIZE 4
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#define LINKAGE 8
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#define PARMS LINKAGE /* no space for saved regs */
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#define RTN PARMS
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#define DEST RTN+RTN_SIZE
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#define SRC DEST+PTR_SIZE
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#define LEN SRC+PTR_SIZE
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.text
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.align
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.global memcpy_glibc
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.func memcpy_glibc
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memcpy_glibc:
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pushl %ebp
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movl %esp, %ebp
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movl LEN(%esp), %ecx
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movl %edi, %eax
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movl DEST(%esp), %edi
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movl %esi, %edx
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movl SRC(%esp), %esi
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cld
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shrl $1, %ecx
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jnc 1f
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movsb
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1: shrl $1, %ecx
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jnc 2f
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movsw
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2: rep
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movsl
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movl %eax, %edi
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movl %edx, %esi
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movl DEST(%esp), %eax
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RETURN_BOUNDED_POINTER (DEST(%esp))
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movl %ebp, %esp
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popl %ebp
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.endfunc
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