mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-22 13:00:06 +00:00
16396c41de
As discussed in https://sourceware.org/ml/libc-alpha/2015-10/msg00403.html the setting of _STRING_ARCH_unaligned currently controls the external GLIBC ABI as well as selecting the use of unaligned accesses withing GLIBC. Since _STRING_ARCH_unaligned was recently changed for AArch64, this would potentially break the ABI in GLIBC 2.23, so split the uses and add _STRING_INLINE_unaligned to select the string ABI. This setting must be fixed for each target, while _STRING_ARCH_unaligned may be changed from release to release. _STRING_ARCH_unaligned is used unconditionally in glibc. But <bits/string.h>, which defines _STRING_ARCH_unaligned, isn't included with -Os. Since _STRING_ARCH_unaligned is internal to glibc and may change between glibc releases, it should be made private to glibc. _STRING_ARCH_unaligned should defined in the new string_private.h heade file which is included unconditionally from internal <string.h> for glibc build. [BZ #19462] * bits/string.h (_STRING_ARCH_unaligned): Renamed to ... (_STRING_INLINE_unaligned): This. * include/string.h: Include <string_private.h>. * string/bits/string2.h: Replace _STRING_ARCH_unaligned with _STRING_INLINE_unaligned. * sysdeps/aarch64/bits/string.h (_STRING_ARCH_unaligned): Removed. (_STRING_INLINE_unaligned): New. * sysdeps/aarch64/string_private.h: New file. * sysdeps/generic/string_private.h: Likewise. * sysdeps/m68k/m680x0/m68020/string_private.h: Likewise. * sysdeps/s390/string_private.h: Likewise. * sysdeps/x86/string_private.h: Likewise. * sysdeps/m68k/m680x0/m68020/bits/string.h (_STRING_ARCH_unaligned): Renamed to ... (_STRING_INLINE_unaligned): This. * sysdeps/s390/bits/string.h (_STRING_ARCH_unaligned): Renamed to ... (_STRING_INLINE_unaligned): This. * sysdeps/sparc/bits/string.h (_STRING_ARCH_unaligned): Renamed to ... (_STRING_INLINE_unaligned): This. * sysdeps/x86/bits/string.h (_STRING_ARCH_unaligned): Renamed to ... (_STRING_INLINE_unaligned): This.
253 lines
6.4 KiB
C
253 lines
6.4 KiB
C
/* Optimized, inlined string functions. S/390 version.
|
|
Copyright (C) 2000-2016 Free Software Foundation, Inc.
|
|
Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
|
|
This file is part of the GNU C Library.
|
|
|
|
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, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#ifndef _STRING_H
|
|
# error "Never use <bits/string.h> directly; include <string.h> instead."
|
|
#endif
|
|
|
|
/* Use the unaligned string inline ABI. */
|
|
#define _STRING_INLINE_unaligned 1
|
|
|
|
/* We only provide optimizations if the user selects them and if
|
|
GNU CC is used. */
|
|
#if !defined __NO_STRING_INLINES && defined __USE_STRING_INLINES \
|
|
&& defined __GNUC__ && __GNUC__ >= 2
|
|
|
|
#ifndef __STRING_INLINE
|
|
# ifndef __extern_inline
|
|
# define __STRING_INLINE inline
|
|
# else
|
|
# define __STRING_INLINE __extern_inline
|
|
# endif
|
|
#endif
|
|
|
|
#define _HAVE_STRING_ARCH_strlen 1
|
|
#ifndef _FORCE_INLINES
|
|
#define strlen(str) __strlen_g ((str))
|
|
|
|
__STRING_INLINE size_t __strlen_g (const char *) __asm__ ("strlen");
|
|
|
|
__STRING_INLINE size_t
|
|
__strlen_g (const char *__str)
|
|
{
|
|
char *__ptr, *__tmp;
|
|
|
|
__ptr = (char *) 0;
|
|
__tmp = (char *) __str;
|
|
__asm__ __volatile__ (" la 0,0\n"
|
|
"0: srst %0,%1\n"
|
|
" jo 0b\n"
|
|
: "+&a" (__ptr), "+&a" (__tmp) :
|
|
: "cc", "memory", "0" );
|
|
return (size_t) (__ptr - __str);
|
|
}
|
|
#endif
|
|
|
|
/* Copy SRC to DEST. */
|
|
#define _HAVE_STRING_ARCH_strcpy 1
|
|
#ifndef _FORCE_INLINES
|
|
#define strcpy(dest, src) __strcpy_g ((dest), (src))
|
|
|
|
__STRING_INLINE char *__strcpy_g (char *, const char *) __asm__ ("strcpy");
|
|
|
|
__STRING_INLINE char *
|
|
__strcpy_g (char *__dest, const char *__src)
|
|
{
|
|
char *tmp = __dest;
|
|
|
|
__asm__ __volatile__ (" la 0,0\n"
|
|
"0: mvst %0,%1\n"
|
|
" jo 0b"
|
|
: "+&a" (__dest), "+&a" (__src) :
|
|
: "cc", "memory", "0" );
|
|
return tmp;
|
|
}
|
|
#endif
|
|
|
|
#define _HAVE_STRING_ARCH_strncpy 1
|
|
#ifndef _FORCE_INLINES
|
|
#define strncpy(dest, src, n) __strncpy_g ((dest), (src), (n))
|
|
|
|
__STRING_INLINE char *__strncpy_g (char *, const char *, size_t)
|
|
__asm__ ("strncpy");
|
|
|
|
__STRING_INLINE char *
|
|
__strncpy_g (char *__dest, const char *__src, size_t __n)
|
|
{
|
|
char *__ret = __dest;
|
|
char *__ptr;
|
|
size_t __diff;
|
|
|
|
if (__n > 0) {
|
|
__diff = (size_t) (__dest - __src);
|
|
__ptr = (char *) __src;
|
|
__asm__ __volatile__ (" j 1f\n"
|
|
"0: la %0,1(%0)\n"
|
|
"1: icm 0,1,0(%0)\n"
|
|
" stc 0,0(%2,%0)\n"
|
|
" jz 3f\n"
|
|
#if defined(__s390x__)
|
|
" brctg %1,0b\n"
|
|
#else
|
|
" brct %1,0b\n"
|
|
#endif
|
|
" j 4f\n"
|
|
"2: la %0,1(%0)\n"
|
|
" stc 0,0(%2,%0)\n"
|
|
#if defined(__s390x__)
|
|
"3: brctg %1,2b\n"
|
|
#else
|
|
"3: brct %1,2b\n"
|
|
#endif
|
|
"4:"
|
|
: "+&a" (__ptr), "+&a" (__n) : "a" (__diff)
|
|
: "cc", "memory", "0" );
|
|
}
|
|
return __ret;
|
|
}
|
|
#endif
|
|
|
|
/* Append SRC onto DEST. */
|
|
#define _HAVE_STRING_ARCH_strcat 1
|
|
#ifndef _FORCE_INLINES
|
|
#define strcat(dest, src) __strcat_g ((dest), (src))
|
|
|
|
__STRING_INLINE char *__strcat_g (char *, const char *) __asm__ ("strcat");
|
|
|
|
__STRING_INLINE char *
|
|
__strcat_g (char *__dest, const char *__src)
|
|
{
|
|
char *__ret = __dest;
|
|
char *__ptr, *__tmp;
|
|
|
|
/* Move __ptr to the end of __dest. */
|
|
__ptr = (char *) 0;
|
|
__tmp = __dest;
|
|
__asm__ __volatile__ (" la 0,0\n"
|
|
"0: srst %0,%1\n"
|
|
" jo 0b\n"
|
|
: "+&a" (__ptr), "+&a" (__tmp) :
|
|
: "cc", "0" );
|
|
|
|
/* Now do the copy. */
|
|
__asm__ __volatile__ (" la 0,0\n"
|
|
"0: mvst %0,%1\n"
|
|
" jo 0b"
|
|
: "+&a" (__ptr), "+&a" (__src) :
|
|
: "cc", "memory", "0" );
|
|
return __ret;
|
|
}
|
|
#endif
|
|
|
|
/* Append no more than N characters from SRC onto DEST. */
|
|
#define _HAVE_STRING_ARCH_strncat 1
|
|
#ifndef _FORCE_INLINES
|
|
#define strncat(dest, src, n) __strncat_g ((dest), (src), (n))
|
|
|
|
__STRING_INLINE char *__strncat_g (char *, const char *, size_t)
|
|
__asm__ ("strncat");
|
|
|
|
__STRING_INLINE char *
|
|
__strncat_g (char *__dest, const char *__src, size_t __n)
|
|
{
|
|
char *__ret = __dest;
|
|
char *__ptr, *__tmp;
|
|
size_t __diff;
|
|
|
|
if (__n > 0) {
|
|
/* Move __ptr to the end of __dest. */
|
|
__ptr = (char *) 0;
|
|
__tmp = __dest;
|
|
__asm__ __volatile__ (" la 0,0\n"
|
|
"0: srst %0,%1\n"
|
|
" jo 0b\n"
|
|
: "+&a" (__ptr), "+&a" (__tmp) :
|
|
: "cc", "memory", "0" );
|
|
|
|
__diff = (size_t) (__ptr - __src);
|
|
__tmp = (char *) __src;
|
|
__asm__ __volatile__ (" j 1f\n"
|
|
"0: la %0,1(%0)\n"
|
|
"1: icm 0,1,0(%0)\n"
|
|
" stc 0,0(%2,%0)\n"
|
|
" jz 2f\n"
|
|
#if defined(__s390x__)
|
|
" brctg %1,0b\n"
|
|
#else
|
|
" brct %1,0b\n"
|
|
#endif
|
|
" slr 0,0\n"
|
|
" stc 0,1(%2,%0)\n"
|
|
"2:"
|
|
: "+&a" (__tmp), "+&a" (__n) : "a" (__diff)
|
|
: "cc", "memory", "0" );
|
|
|
|
}
|
|
return __ret;
|
|
}
|
|
#endif
|
|
|
|
/* Search N bytes of S for C. */
|
|
#define _HAVE_STRING_ARCH_memchr 1
|
|
#ifndef _FORCE_INLINES
|
|
__STRING_INLINE void *
|
|
memchr (const void *__str, int __c, size_t __n)
|
|
{
|
|
char *__ptr, *__tmp;
|
|
|
|
__tmp = (char *) __str;
|
|
__ptr = (char *) __tmp + __n;
|
|
__asm__ __volatile__ (" lhi 0,0xff\n"
|
|
" nr 0,%2\n"
|
|
"0: srst %0,%1\n"
|
|
" jo 0b\n"
|
|
" brc 13,1f\n"
|
|
" la %0,0\n"
|
|
"1:"
|
|
: "+&a" (__ptr), "+&a" (__tmp) : "d" (__c)
|
|
: "cc", "memory", "0" );
|
|
return __ptr;
|
|
}
|
|
#endif
|
|
|
|
/* Compare S1 and S2. */
|
|
#define _HAVE_STRING_ARCH_strcmp 1
|
|
#ifndef _FORCE_INLINES
|
|
__STRING_INLINE int
|
|
strcmp (const char *__s1, const char *__s2)
|
|
{
|
|
char *__p1, *__p2;
|
|
int __ret;
|
|
|
|
__p1 = (char *) __s1;
|
|
__p2 = (char *) __s2;
|
|
__asm__ __volatile__ (" slr 0,0\n"
|
|
"0: clst %1,%2\n"
|
|
" jo 0b\n"
|
|
" ipm %0\n"
|
|
" srl %0,28"
|
|
: "=d" (__ret), "+&a" (__p1), "+&a" (__p2) :
|
|
: "cc", "memory", "0" );
|
|
__ret = (__ret == 0) ? 0 : (__ret == 1) ? -1 : 1;
|
|
return __ret;
|
|
}
|
|
#endif
|
|
|
|
#endif /* Use string inlines && GNU CC. */
|