mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-26 04:31:03 +00:00
165 lines
2.8 KiB
ArmAsm
165 lines
2.8 KiB
ArmAsm
/* strcpy/stpcpy implementation for i586.
|
|
Copyright (C) 1997, 2000, 2003 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, write to the Free
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA. */
|
|
|
|
#include <sysdep.h>
|
|
#include "asm-syntax.h"
|
|
#include "bp-sym.h"
|
|
#include "bp-asm.h"
|
|
|
|
#define PARMS LINKAGE+12 /* space for 3 saved regs */
|
|
#define RTN PARMS
|
|
#define DEST RTN+RTN_SIZE
|
|
#define SRC DEST+PTR_SIZE
|
|
|
|
#ifndef USE_AS_STPCPY
|
|
# define STRCPY strcpy
|
|
#endif
|
|
|
|
#define magic 0xfefefeff
|
|
|
|
.text
|
|
ENTRY (BP_SYM (STRCPY))
|
|
ENTER
|
|
|
|
pushl %edi
|
|
pushl %esi
|
|
pushl %ebx
|
|
|
|
movl DEST(%esp), %edi
|
|
movl SRC(%esp), %esi
|
|
CHECK_BOUNDS_LOW (%edi, DEST(%esp))
|
|
CHECK_BOUNDS_LOW (%esi, SRC(%esp))
|
|
|
|
xorl %eax, %eax
|
|
leal -1(%esi), %ecx
|
|
|
|
movl $magic, %ebx
|
|
andl $3, %ecx
|
|
|
|
#ifdef PIC
|
|
call 2f
|
|
2: popl %edx
|
|
/* 0xb is the distance between 2: and 1: but we avoid writing
|
|
1f-2b because the assembler generates worse code. */
|
|
leal 0xb(%edx,%ecx,8), %ecx
|
|
#else
|
|
leal 1f(,%ecx,8), %ecx
|
|
#endif
|
|
|
|
jmp *%ecx
|
|
|
|
.align 8
|
|
1:
|
|
orb (%esi), %al
|
|
jz L(end)
|
|
stosb
|
|
xorl %eax, %eax
|
|
incl %esi
|
|
|
|
orb (%esi), %al
|
|
jz L(end)
|
|
stosb
|
|
xorl %eax, %eax
|
|
incl %esi
|
|
|
|
orb (%esi), %al
|
|
jz L(end)
|
|
stosb
|
|
xorl %eax, %eax
|
|
incl %esi
|
|
|
|
L(1): movl (%esi), %ecx
|
|
leal 4(%esi),%esi
|
|
|
|
subl %ecx, %eax
|
|
addl %ebx, %ecx
|
|
|
|
decl %eax
|
|
jnc L(3)
|
|
|
|
movl %ecx, %edx
|
|
xorl %ecx, %eax
|
|
|
|
subl %ebx, %edx
|
|
andl $~magic, %eax
|
|
|
|
jne L(4)
|
|
|
|
movl %edx, (%edi)
|
|
leal 4(%edi),%edi
|
|
|
|
jmp L(1)
|
|
|
|
L(3): movl %ecx, %edx
|
|
|
|
subl %ebx, %edx
|
|
|
|
L(4): movb %dl, (%edi)
|
|
testb %dl, %dl
|
|
|
|
movl %edx, %eax
|
|
jz L(end2)
|
|
|
|
shrl $16, %eax
|
|
movb %dh, 1(%edi)
|
|
#ifdef USE_AS_STPCPY
|
|
addl $1, %edi
|
|
#endif
|
|
|
|
cmpb $0, %dh
|
|
jz L(end2)
|
|
|
|
#ifdef USE_AS_STPCPY
|
|
movb %al, 1(%edi)
|
|
addl $1, %edi
|
|
|
|
cmpb $0, %al
|
|
jz L(end2)
|
|
|
|
addl $1, %edi
|
|
#else
|
|
movb %al, 2(%edi)
|
|
testb %al, %al
|
|
|
|
leal 3(%edi), %edi
|
|
jz L(end2)
|
|
#endif
|
|
|
|
L(end): movb %ah, (%edi)
|
|
|
|
L(end2):
|
|
/* GKM FIXME: check high bounds */
|
|
#ifdef USE_AS_STPCPY
|
|
movl %edi, %eax
|
|
#else
|
|
movl DEST(%esp), %eax
|
|
#endif
|
|
RETURN_BOUNDED_POINTER (DEST(%esp))
|
|
popl %ebx
|
|
popl %esi
|
|
popl %edi
|
|
|
|
LEAVE
|
|
RET_PTR
|
|
END (BP_SYM (STRCPY))
|
|
#ifndef USE_AS_STPCPY
|
|
libc_hidden_builtin_def (strcpy)
|
|
#endif
|