1 /* strcpy/stpcpy implementation for i586.
2 Copyright (C) 1997-2013 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, see
18 <http://www.gnu.org/licenses/>. */
21 #include "asm-syntax.h"
25 #define PARMS LINKAGE+12 /* space for 3 saved regs */
27 #define DEST RTN+RTN_SIZE
28 #define SRC DEST+PTR_SIZE
31 # define STRCPY strcpy
34 #define magic 0xfefefeff
37 ENTRY (BP_SYM (STRCPY))
40 cfi_adjust_cfa_offset (4)
42 cfi_adjust_cfa_offset (4)
44 cfi_adjust_cfa_offset (4)
47 cfi_rel_offset (edi, 8)
49 cfi_rel_offset (esi, 4)
55 cfi_rel_offset (ebx, 0)
60 cfi_adjust_cfa_offset (4)
62 cfi_adjust_cfa_offset (-4)
63 /* 0xb is the distance between 2: and 1: but we avoid writing
64 1f-2b because the assembler generates worse code. */
65 leal 0xb(%edx,%ecx,8), %ecx
67 leal 1f(,%ecx,8), %ecx
92 L(1): movl (%esi), %ecx
114 L(3): movl %ecx, %edx
118 L(4): movb %dl, (%edi)
149 L(end): movb %ah, (%edi)
152 /* GKM FIXME: check high bounds */
156 movl DEST(%esp), %eax
159 cfi_adjust_cfa_offset (-4)
162 cfi_adjust_cfa_offset (-4)
165 cfi_adjust_cfa_offset (-4)
169 END (BP_SYM (STRCPY))
170 #ifndef USE_AS_STPCPY
171 libc_hidden_builtin_def (strcpy)