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 Samuel Thibault <samuel.thibault@ens-lyon.org>
+
+ * 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.
+
2017-10-02 Joseph Myers <joseph@codesourcery.com>
* sysdeps/ieee754/dbl-64/s_atan.c: Include <libm-alias-double.h>.
include/libc-symbols.h that avoid PLT slots in the shared objects. */
#undef NO_HIDDEN
+/* Define this to disable in rtld the 'hidden_proto' et al macros in
+ include/libc-symbols.h that avoid PLT slots in the shared objects. */
+#undef NO_RTLD_HIDDEN
+
/* Define this to disable lazy relocations in DSOs. */
#undef BIND_NOW
const char *function)
__THROW __attribute__ ((__noreturn__)) attribute_hidden;
-# if IS_IN (libc) || IS_IN (rtld)
+# if IS_IN (libc) || (IS_IN (rtld) && !defined NO_RTLD_HIDDEN)
hidden_proto (__assert_fail)
hidden_proto (__assert_perror_fail)
# endif
libc_hidden_proto (__scandirat)
libc_hidden_proto (scandirat64)
-# if IS_IN (rtld)
+# if IS_IN (rtld) && !defined NO_RTLD_HIDDEN
extern __typeof (__rewinddir) __rewinddir attribute_hidden;
# endif
# endif
/* Define and initialize `__progname' et. al. */
extern void __init_misc (int, char **, char **) attribute_hidden;
-# if IS_IN (rtld)
+# if IS_IN (rtld) && !defined NO_RTLD_HIDDEN
extern __typeof (__profile_frequency) __profile_frequency attribute_hidden;
# endif
# define libc_hidden_data_ver(local, name)
#endif
-#if IS_IN (rtld)
+#if IS_IN (rtld) && !defined NO_RTLD_HIDDEN
# define rtld_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
# define rtld_hidden_tls_proto(name, attrs...) hidden_tls_proto (name, ##attrs)
# define rtld_hidden_def(name) hidden_def (name)
libc_hidden_proto (_setjmp)
libc_hidden_proto (__sigsetjmp)
-# if IS_IN (rtld)
+# if IS_IN (rtld) && !defined NO_RTLD_HIDDEN
extern __typeof (__sigsetjmp) __sigsetjmp attribute_hidden;
# endif
#endif
/* Allocate real-time signal with highest/lowest available priority. */
extern int __libc_allocate_rtsig (int __high);
-# if IS_IN (rtld)
+# if IS_IN (rtld) && !defined NO_RTLD_HIDDEN
extern __typeof (__sigaction) __sigaction attribute_hidden;
extern __typeof (__libc_sigaction) __libc_sigaction attribute_hidden;
# endif
extern struct abort_msg_s *__abort_msg;
libc_hidden_proto (__abort_msg)
-# if IS_IN (rtld)
+# if IS_IN (rtld) && !defined NO_RTLD_HIDDEN
extern __typeof (unsetenv) unsetenv attribute_hidden;
extern __typeof (__strtoul_internal) __strtoul_internal attribute_hidden;
# endif
libc_hidden_builtin_proto (strstr)
libc_hidden_builtin_proto (ffs)
-#if IS_IN (rtld)
+#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;
libc_hidden_proto (__mkdir)
extern int __mknod (const char *__path,
__mode_t __mode, __dev_t __dev);
-#if IS_IN (libc) || IS_IN (rtld)
+#if IS_IN (libc) || (IS_IN (rtld) && !defined NO_RTLD_HIDDEN)
hidden_proto (__fxstat)
hidden_proto (__fxstat64)
hidden_proto (__lxstat)
libc_hidden_proto (__fxstatat)
libc_hidden_proto (__fxstatat64)
-# if IS_IN (rtld)
+# if IS_IN (rtld) && !defined NO_RTLD_HIDDEN
extern __typeof (__fxstatat64) __fxstatat64 attribute_hidden;
# endif
libc_hidden_proto (uname)
libc_hidden_proto (__uname)
-# if IS_IN (rtld)
+# if IS_IN (rtld) && !defined NO_RTLD_HIDDEN
extern __typeof (__uname) __uname attribute_hidden;
# endif
#endif
extern const char _itoa_upper_digits[];
extern const char _itoa_lower_digits[];
-#if IS_IN (libc) || IS_IN (rtld)
+#if IS_IN (libc) || (IS_IN (rtld) && !defined NO_RTLD_HIDDEN)
hidden_proto (_itoa_upper_digits)
hidden_proto (_itoa_lower_digits)
#endif
# This file is generated from configure.ac by Autoconf. DO NOT EDIT!
-$as_echo "#define NO_HIDDEN 1" >>confdefs.h
+$as_echo "#define NO_RTLD_HIDDEN 1" >>confdefs.h
if test -n "$sysheaders"; then
dnl We need this setting because of the need for PLT calls in ld.so.
dnl See Roland's comment in
dnl https://sourceware.org/bugzilla/show_bug.cgi?id=15605
-AC_DEFINE([NO_HIDDEN])
+AC_DEFINE([NO_RTLD_HIDDEN])
if test -n "$sysheaders"; then
OLD_CPPFLAGS=$CPPFLAGS