1 /* strcpy/stpcpy implementation for i586.
2 Copyright (C) 1997, 2000, 2003, 2005 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))
41 cfi_adjust_cfa_offset (4)
43 cfi_adjust_cfa_offset (4)
45 cfi_adjust_cfa_offset (4)
48 cfi_rel_offset (edi, 8)
50 cfi_rel_offset (esi, 4)
51 CHECK_BOUNDS_LOW (%edi, DEST(%esp))
52 CHECK_BOUNDS_LOW (%esi, SRC(%esp))
58 cfi_rel_offset (ebx, 0)
63 cfi_adjust_cfa_offset (4)
65 cfi_adjust_cfa_offset (-4)
66 /* 0xb is the distance between 2: and 1: but we avoid writing
67 1f-2b because the assembler generates worse code. */
68 leal 0xb(%edx,%ecx,8), %ecx
70 leal 1f(,%ecx,8), %ecx
95 L(1): movl (%esi), %ecx
117 L(3): movl %ecx, %edx
121 L(4): movb %dl, (%edi)
152 L(end): movb %ah, (%edi)
155 /* GKM FIXME: check high bounds */
159 movl DEST(%esp), %eax
161 RETURN_BOUNDED_POINTER (DEST(%esp))
163 cfi_adjust_cfa_offset (-4)
166 cfi_adjust_cfa_offset (-4)
169 cfi_adjust_cfa_offset (-4)
174 END (BP_SYM (STRCPY))
175 #ifndef USE_AS_STPCPY
176 libc_hidden_builtin_def (strcpy)