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glibc/include/string.h
Samuel Thibault 3d1870fa33 Introduce NO_RTLD_HIDDEN, make hurd use it instead of NO_HIDDEN 
On the Hurd, the rtld needs to see its own dumb versions of a few functions
(defined in sysdeps/mach/hurd/dl-sysdep.c) overridden by libc's versions once
loaded. rtld should thus not have hidden attribute for these.  To achieve this,
the Hurd port used to just define NO_HIDDEN, which disables it completely. For
now, this changes that to disabling it for all rtld functions, for simplicity.

See Roland's comment on https://sourceware.org/bugzilla/show_bug.cgi?id=15605#c5

The ld.so numbers remain at

  8 .rel.plt      000000c8  00000c24  00000c24  00000c24  2**2
                  CONTENTS, ALLOC, LOAD, READONLY, DATA
  9 .plt          000001a0  00000cf0  00000cf0  00000cf0  2**4
                  CONTENTS, ALLOC, LOAD, READONLY, CODE
 10 .plt.got      00000010  00000e90  00000e90  00000e90  2**3
                  CONTENTS, ALLOC, LOAD, READONLY, CODE
 18 .got.plt      00000070  0002d000  0002d000  0002c000  2**2
                  CONTENTS, ALLOC, LOAD, DATA

which is about 3 times as much as on Linux.

The libc.so numbers get divided by 3 (the remainings are mostly RPC stub calls)

	* include/libc-symbols.h [NO_RTLD_HIDDEN] (rtld_hidden_proto,
	rtld_hidden_tls_proto, rtld_hidden_def, rtld_hidden_weak,
	rtld_hidden_rtld_hidden_ver, data_def, rtld_hidden_data_weak,
	rtld_hidden_data_ver): Define to empty.
	* include/assert.h [IS_IN(rtld) && NO_RTLD_HIDDEN] (__assert_fail,
	__assert_perror_fail): Likewise.
	* include/dirent.h [IS_IN(rtld) && NO_RTLD_HIDDEN]
	(__rewinddir): Likewise.
	* include/libc-internal.h [IS_IN(rtld) && NO_RTLD_HIDDEN]
	(__profile_frequency): Likewise.
	* include/setjmp.h (__sigsetjmp): Likewise.
	* include/signal.h [IS_IN(rtld) && NO_RTLD_HIDDEN] (__sigaction,
	__libc_sigaction): Likewise.
	* include/stdlib.h [NO_RTLD_HIDDEN] (unsetenv, __strtoul_internal): Do
	not set hidden attribute.
	* include/string.h [IS_IN(rtld) && NO_RTLD_HIDDEN] (__stpcpy, __strdup,
	__strerror_t, __strsep_g, memchr, memcmp, memcpy, memmove, memset,
	rawmemchr, stpcpy, strchr, strcmp, strlen, strnlen, strsep): Likewise.
	* include/sys/stat.h [IS_IN(rtld) && NO_RTLD_HIDDEN] (__fxstat,
	__fxstat64, __lxstat, __lxstat64, __xstat, __xstat64,
	__fxstatat64): Likewise.
	* include/sys/utsname.h [IS_IN(rtld) && NO_RTLD_HIDDEN]
	(__uname): Likewise.
	* include/sysdeps/generic/_itoa.h [IS_IN(rtld) && NO_RTLD_HIDDEN]
	(_itoa_upper_digits, _itoa_lower_digits): Likewise.
	* sysdeps/mach/hurd/configure.ac (NO_HIDDEN): Do not set.
	(NO_RTLD_HIDDEN): Set.
	* sysdeps/mach/hurd/configure: Refresh.
	* config.h.in: Refresh.
2017-10-03 01:33:38 +02:00

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#ifndef _STRING_H
#ifndef _ISOMAC
/* Some of these are defined as macros in the real string.h, so we must
prototype them before including it. */
#include <sys/types.h>
extern void *__memccpy (void *__dest, const void *__src,
int __c, size_t __n);
extern size_t __strnlen (const char *__string, size_t __maxlen)
__attribute_pure__;
extern char *__strsep (char **__stringp, const char *__delim);
libc_hidden_proto (__strsep)
extern int __strverscmp (const char *__s1, const char *__s2)
__attribute_pure__;
extern int __strncasecmp (const char *__s1, const char *__s2,
size_t __n)
__attribute_pure__;
extern int __strcasecmp (const char *__s1, const char *__s2)
__attribute_pure__;
extern char *__strcasestr (const char *__haystack, const char *__needle)
__attribute_pure__;
extern char *__strdup (const char *__string)
__attribute_malloc__;
extern char *__strndup (const char *__string, size_t __n)
__attribute_malloc__;
extern void *__rawmemchr (const void *__s, int __c)
__attribute_pure__;
extern char *__strchrnul (const char *__s, int __c)
__attribute_pure__;
extern void *__memrchr (const void *__s, int __c, size_t __n)
__attribute_pure__;
extern void *__memchr (const void *__s, int __c, size_t __n)
__attribute_pure__;
extern void __bzero (void *__s, size_t __n) __THROW __nonnull ((1));
extern int __ffs (int __i) __attribute__ ((const));
extern char *__strerror_r (int __errnum, char *__buf, size_t __buflen);
/* Get _STRING_ARCH_unaligned. */
#include <string_private.h>
#endif
#include <string/string.h>
#ifndef _ISOMAC
extern __typeof (strcoll_l) __strcoll_l;
extern __typeof (strxfrm_l) __strxfrm_l;
extern __typeof (strcasecmp_l) __strcasecmp_l;
extern __typeof (strncasecmp_l) __strncasecmp_l;
/* Alternative version which doesn't pollute glibc's namespace. */
#if IS_IN (libc)
# undef strndupa
# define strndupa(s, n) \
(__extension__ \
({ \
const char *__old = (s); \
size_t __len = __strnlen (__old, (n)); \
char *__new = (char *) __builtin_alloca (__len + 1); \
__new[__len] = '\0'; \
(char *) memcpy (__new, __old, __len); \
}))
#endif
libc_hidden_proto (__mempcpy)
#ifndef __NO_STRING_INLINES
# define __mempcpy(dest, src, n) __builtin_mempcpy (dest, src, n)
#endif
libc_hidden_proto (__stpcpy)
#ifndef __NO_STRING_INLINES
# define __stpcpy(dest, src) __builtin_stpcpy (dest, src)
#endif
libc_hidden_proto (__stpncpy)
libc_hidden_proto (__rawmemchr)
libc_hidden_proto (__strcasecmp)
libc_hidden_proto (__strcasecmp_l)
libc_hidden_proto (__strncasecmp_l)
extern __typeof (strncat) __strncat;
libc_hidden_proto (__strncat)
libc_hidden_proto (__strdup)
libc_hidden_proto (__strndup)
libc_hidden_proto (__strerror_r)
libc_hidden_proto (__strverscmp)
libc_hidden_proto (basename)
extern char *__basename (const char *__filename) __THROW __nonnull ((1));
libc_hidden_proto (__basename)
libc_hidden_proto (strcoll)
libc_hidden_proto (__strcoll_l)
libc_hidden_proto (__strxfrm_l)
libc_hidden_proto (__strtok_r)
extern char *__strsep_g (char **__stringp, const char *__delim);
libc_hidden_proto (__strsep_g)
libc_hidden_proto (strnlen)
libc_hidden_proto (__strnlen)
libc_hidden_proto (memmem)
extern __typeof (memmem) __memmem;
libc_hidden_proto (__memmem)
libc_hidden_proto (__ffs)
#if IS_IN (libc)
/* Avoid hidden reference to IFUNC symbol __explicit_bzero_chk. */
void __explicit_bzero_chk_internal (void *, size_t, size_t)
__THROW __nonnull ((1)) attribute_hidden;
# define explicit_bzero(buf, len) \
__explicit_bzero_chk_internal (buf, len, __bos0 (buf))
#elif !IS_IN (nonlib)
void __explicit_bzero_chk (void *, size_t, size_t) __THROW __nonnull ((1));
# define explicit_bzero(buf, len) __explicit_bzero_chk (buf, len, __bos0 (buf))
#endif
libc_hidden_builtin_proto (memchr)
libc_hidden_builtin_proto (memcpy)
libc_hidden_builtin_proto (mempcpy)
libc_hidden_builtin_proto (memcmp)
libc_hidden_builtin_proto (memmove)
libc_hidden_builtin_proto (memset)
libc_hidden_builtin_proto (strcat)
libc_hidden_builtin_proto (strchr)
libc_hidden_builtin_proto (strcmp)
libc_hidden_builtin_proto (strcpy)
libc_hidden_builtin_proto (strcspn)
libc_hidden_builtin_proto (strlen)
libc_hidden_builtin_proto (strncmp)
libc_hidden_builtin_proto (strncpy)
libc_hidden_builtin_proto (strpbrk)
libc_hidden_builtin_proto (stpcpy)
libc_hidden_builtin_proto (strrchr)
libc_hidden_builtin_proto (strspn)
libc_hidden_builtin_proto (strstr)
libc_hidden_builtin_proto (ffs)
#if IS_IN (rtld) && !defined NO_RTLD_HIDDEN
extern __typeof (__stpcpy) __stpcpy attribute_hidden;
extern __typeof (__strdup) __strdup attribute_hidden;
extern __typeof (__strerror_r) __strerror_r attribute_hidden;
extern __typeof (__strsep_g) __strsep_g attribute_hidden;
extern __typeof (memchr) memchr attribute_hidden;
extern __typeof (memcmp) memcmp attribute_hidden;
extern __typeof (memcpy) memcpy attribute_hidden;
extern __typeof (memmove) memmove attribute_hidden;
extern __typeof (memset) memset attribute_hidden;
extern __typeof (rawmemchr) rawmemchr attribute_hidden;
extern __typeof (stpcpy) stpcpy attribute_hidden;
extern __typeof (strchr) strchr attribute_hidden;
extern __typeof (strcmp) strcmp attribute_hidden;
extern __typeof (strlen) strlen attribute_hidden;
extern __typeof (strnlen) strnlen attribute_hidden;
extern __typeof (strsep) strsep attribute_hidden;
#endif
#if (!IS_IN (libc) || !defined SHARED) \
&& !defined NO_MEMPCPY_STPCPY_REDIRECT
/* Redirect calls to __builtin_mempcpy and __builtin_stpcpy to call
__mempcpy and __stpcpy if not inlined. */
extern __typeof (mempcpy) mempcpy __asm__ ("__mempcpy");
extern __typeof (stpcpy) stpcpy __asm__ ("__stpcpy");
#endif
extern void *__memcpy_chk (void *__restrict __dest,
const void *__restrict __src, size_t __len,
size_t __destlen) __THROW;
extern void *__memmove_chk (void *__dest, const void *__src, size_t __len,
size_t __destlen) __THROW;
extern void *__mempcpy_chk (void *__restrict __dest,
const void *__restrict __src, size_t __len,
size_t __destlen) __THROW;
extern void *__memset_chk (void *__dest, int __ch, size_t __len,
size_t __destlen) __THROW;
extern char *__strcpy_chk (char *__restrict __dest,
const char *__restrict __src,
size_t __destlen) __THROW;
extern char *__stpcpy_chk (char *__restrict __dest,
const char *__restrict __src,
size_t __destlen) __THROW;
extern char *__strncpy_chk (char *__restrict __dest,
const char *__restrict __src,
size_t __len, size_t __destlen) __THROW;
extern char *__strcat_chk (char *__restrict __dest,
const char *__restrict __src,
size_t __destlen) __THROW;
extern char *__strncat_chk (char *__restrict __dest,
const char *__restrict __src,
size_t __len, size_t __destlen) __THROW;
#endif
#endif
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