Introduce <elf-initfini.h> and ELF_INITFINI for all architectures

This supersedes the init_array sysdeps directory.  It allows us to
check for ELF_INITFINI in both C and assembler code, and skip DT_INIT
and DT_FINI processing completely on newer architectures.

A new header file is needed because <dl-machine.h> is incompatible
with assembler code.  <sysdep.h> is compatible with assembler code,
but it cannot be included in all assembler files because on some
architectures, it redefines register names, and some assembler files
conflict with that.

<elf-initfini.h> is replicated for legacy architectures which need
DT_INIT/DT_FINI support.  New architectures follow the generic default
and disable it.

26 files changed, 330 insertions, 105 deletions

diff --git a/csu/elf-init.c b/csu/elf-init.c
index b713c8b0fb..98b3f11ff5 100644
--- a/csu/elf-init.c
+++ b/csu/elf-init.c
@@ -34,6 +34,7 @@
    <https://www.gnu.org/licenses/>.  */
 
 #include <stddef.h>
+#include <elf-initfini.h>
 
 
 /* These magic symbols are provided by the linker.  */
@@ -49,7 +50,7 @@ extern void (*__fini_array_start []) (void) attribute_hidden;
 extern void (*__fini_array_end []) (void) attribute_hidden;
 
 
-#ifndef NO_INITFINI
+#if ELF_INITFINI
 /* These function symbols are provided for the .init/.fini section entry
    points automagically by the linker.  */
 extern void _init (void);
@@ -79,7 +80,7 @@ __libc_csu_init (int argc, char **argv, char **envp)
   }
 #endif
 
-#ifndef NO_INITFINI
+#if ELF_INITFINI
   _init ();
 #endif
 
@@ -99,7 +100,7 @@ __libc_csu_fini (void)
   while (i-- > 0)
     (*__fini_array_start [i]) ();
 
-# ifndef NO_INITFINI
+# if ELF_INITFINI
   _fini ();
 # endif
 #endif
diff --git a/csu/gmon-start.c b/csu/gmon-start.c
index 2803be342a..da9f04c522 100644
--- a/csu/gmon-start.c
+++ b/csu/gmon-start.c
@@ -37,6 +37,7 @@
 #include <sys/gmon.h>
 #include <stdlib.h>
 #include <unistd.h>
+#include <elf-initfini.h>
 #define __ASSEMBLY__
 #include <entry.h>
 
@@ -59,6 +60,13 @@ extern char etext[];
 # endif
 #endif
 
+#if !ELF_INITFINI
+/* Instead of defining __gmon_start__ globally in gcrt1.o, we make it
+   static and just put a pointer to it into the .preinit_array
+   section.  */
+# define GMON_START_ARRAY_SECTION ".preinit_array"
+#endif
+
 #ifdef GMON_START_ARRAY_SECTION
 static void __gmon_start__ (void);
 static void (*const gmon_start_initializer) (void)
diff --git a/elf/dl-fini.c b/elf/dl-fini.c
index 226a6f077a..231db3d66d 100644
--- a/elf/dl-fini.c
+++ b/elf/dl-fini.c
@@ -19,6 +19,7 @@
 #include <assert.h>
 #include <string.h>
 #include <ldsodefs.h>
+#include <elf-initfini.h>
 
 
 /* Type of the constructor functions.  */
@@ -117,7 +118,7 @@ _dl_fini (void)
 
 		  /* Is there a destructor function?  */
 		  if (l->l_info[DT_FINI_ARRAY] != NULL
-		      || l->l_info[DT_FINI] != NULL)
+		      || (ELF_INITFINI && l->l_info[DT_FINI] != NULL))
 		    {
 		      /* When debugging print a message first.  */
 		      if (__builtin_expect (GLRO(dl_debug_mask)
@@ -139,7 +140,7 @@ _dl_fini (void)
 			}
 
 		      /* Next try the old-style destructor.  */
-		      if (l->l_info[DT_FINI] != NULL)
+		      if (ELF_INITFINI && l->l_info[DT_FINI] != NULL)
 			DL_CALL_DT_FINI
 			  (l, l->l_addr + l->l_info[DT_FINI]->d_un.d_ptr);
 		    }
diff --git a/elf/dl-init.c b/elf/dl-init.c
index 55d528c7a5..1234611a1c 100644
--- a/elf/dl-init.c
+++ b/elf/dl-init.c
@@ -18,6 +18,7 @@
 
 #include <stddef.h>
 #include <ldsodefs.h>
+#include <elf-initfini.h>
 
 
 /* Type of the initializer.  */
@@ -40,11 +41,6 @@ call_init (struct link_map *l, int argc, char **argv, char **env)
       && l->l_type == lt_executable)
     return;
 
-  /* Are there any constructors?  */
-  if (l->l_info[DT_INIT] == NULL
-      && __builtin_expect (l->l_info[DT_INIT_ARRAY] == NULL, 1))
-    return;
-
   /* Print a debug message if wanted.  */
   if (__glibc_unlikely (GLRO(dl_debug_mask) & DL_DEBUG_IMPCALLS))
     _dl_debug_printf ("\ncalling init: %s\n\n",
@@ -54,7 +50,7 @@ call_init (struct link_map *l, int argc, char **argv, char **env)
      - the one named by DT_INIT
      - the others in the DT_INIT_ARRAY.
   */
-  if (l->l_info[DT_INIT] != NULL)
+  if (ELF_INITFINI && l->l_info[DT_INIT] != NULL)
     DL_CALL_DT_INIT(l, l->l_addr + l->l_info[DT_INIT]->d_un.d_ptr, argc, argv, env);
 
   /* Next see whether there is an array with initialization functions.  */
diff --git a/nptl/pt-crti.S b/nptl/pt-crti.S
index 6c60f8a1a4..3dbef78adb 100644
--- a/nptl/pt-crti.S
+++ b/nptl/pt-crti.S
@@ -33,11 +33,18 @@
    License along with the GNU C Library; if not, see
    <https://www.gnu.org/licenses/>.  */
 
+#include <elf-initfini.h>
+
 /* Arrange for __pthread_initialize_minimal_internal to be called at
    libpthread startup, instead of conditionally calling
    __gmon_start__.  */
 
-#define PREINIT_FUNCTION __pthread_initialize_minimal_internal
-#define PREINIT_FUNCTION_WEAK 0
+#if ELF_INITFINI
+# define PREINIT_FUNCTION __pthread_initialize_minimal_internal
+# define PREINIT_FUNCTION_WEAK 0
 
-#include <crti.S>
+# include <crti.S>
+#else
+	.section .init_array,"a",%init_array
+	.dc.a __pthread_initialize_minimal_internal
+#endif
diff --git a/sysdeps/aarch64/elf-initfini.h b/sysdeps/aarch64/elf-initfini.h
new file mode 100644
index 0000000000..bb436065a8
--- /dev/null
+++ b/sysdeps/aarch64/elf-initfini.h
@@ -0,0 +1,20 @@
+/* Determine DT_INIT/DT_FINI support in the dynamic loader.  AArch64 version.
+   Copyright (C) 2020 Free Software Foundation, Inc.
+   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/>.  */
+
+/* Enable DT_INIT/DT_FINI support.  */
+#define ELF_INITFINI 1
diff --git a/sysdeps/init_array/pt-crti.S b/sysdeps/alpha/elf-initfini.h
index 24c8a5d4d6..69d056d493 100644
--- a/sysdeps/init_array/pt-crti.S
+++ b/sysdeps/alpha/elf-initfini.h
@@ -1,5 +1,5 @@
-/* Special initializer support for libpthread.
-   Copyright (C) 2015-2020 Free Software Foundation, Inc.
+/* Determine DT_INIT/DT_FINI support in the dynamic loader.  Alpha version.
+   Copyright (C) 2020 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -16,8 +16,5 @@
    License along with the GNU C Library; if not, see
    <https://www.gnu.org/licenses/>.  */
 
-/* This arranges for libpthread.so's special initializer to be called as
-   soon as the library is loaded.  */
-
-	.section .init_array,"a",%init_array
-	.dc.a __pthread_initialize_minimal_internal
+/* Enable DT_INIT/DT_FINI support.  */
+#define ELF_INITFINI 1
diff --git a/sysdeps/arm/elf-initfini.h b/sysdeps/arm/elf-initfini.h
new file mode 100644
index 0000000000..24f22352db
--- /dev/null
+++ b/sysdeps/arm/elf-initfini.h
@@ -0,0 +1,20 @@
+/* Determine DT_INIT/DT_FINI support in the dynamic loader.  Arm version.
+   Copyright (C) 2020 Free Software Foundation, Inc.
+   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
+   <https://www.gnu.org/licenses/>.  */
+
+/* Enable DT_INIT/DT_FINI support.  */
+#define ELF_INITFINI 1
diff --git a/sysdeps/csky/Implies b/sysdeps/csky/Implies
index fd80b4826e..f8c3a7586e 100644
--- a/sysdeps/csky/Implies
+++ b/sysdeps/csky/Implies
@@ -1,4 +1,3 @@
-init_array
 wordsize-32
 # C-SKY uses IEEE 754 floating point.
 ieee754/flt-32
diff --git a/sysdeps/init_array/crti.S b/sysdeps/generic/crti.S
index 145c918f93..82d6dc0d91 100644
--- a/sysdeps/init_array/crti.S
+++ b/sysdeps/generic/crti.S
@@ -12,12 +12,18 @@
    toolchains without .init_array support can use this to avoid the
    superfluous .init and .fini boilerplate code.  */
 
-#ifdef PREINIT_FUNCTION
+#include <elf-initfini.h>
 
-#if PREINIT_FUNCTION_WEAK
-# error PREINIT_FUNCTION_WEAK is unsupported
+#if ELF_INITFINI
+# error Cannot use default crti.S because it lacks _init code
 #endif
 
+#ifdef PREINIT_FUNCTION
+
+# if PREINIT_FUNCTION_WEAK
+#  error PREINIT_FUNCTION_WEAK is unsupported
+# endif
+
 /* This arranges for PREINIT_FUNCTION to be called upon loading a library that
    contains crti.o.  */
 
diff --git a/sysdeps/init_array/crtn.S b/sysdeps/generic/crtn.S
index 6f70e77160..d92b07dd0b 100644
--- a/sysdeps/init_array/crtn.S
+++ b/sysdeps/generic/crtn.S
@@ -11,3 +11,9 @@
    But new configurations without compatibility concerns for
    toolchains without .init_array support can use this to avoid the
    superfluous .init and .fini boilerplate code.  */
+
+#include <elf-initfini.h>
+
+#if ELF_INITFINI
+# error Cannot use genetric crtn.S because it lacks _fini code
+#endif
diff --git a/sysdeps/generic/elf-initfini.h b/sysdeps/generic/elf-initfini.h
new file mode 100644
index 0000000000..75e920d283
--- /dev/null
+++ b/sysdeps/generic/elf-initfini.h
@@ -0,0 +1,24 @@
+/* Determine DT_INIT/DT_FINI support in the dynamic loader.
+   Copyright (C) 2020 Free Software Foundation, Inc.
+   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
+   <https://www.gnu.org/licenses/>.  */
+
+/* Legacy platforms define this to 1.  If 0, the dynamic linker
+   ignores the DT_INIT and DT_FINI tags, and static binaries will not
+   call the _init or _fini functions.  If 1, the old constructor
+   mechanisms are used in addition to the initarray/finiarray
+   support.  */
+#define ELF_INITFINI 0
diff --git a/sysdeps/hppa/elf-initfini.h b/sysdeps/hppa/elf-initfini.h
new file mode 100644
index 0000000000..28f84bb039
--- /dev/null
+++ b/sysdeps/hppa/elf-initfini.h
@@ -0,0 +1,20 @@
+/* Determine DT_INIT/DT_FINI support in the dynamic loader.  HPPA version.
+   Copyright (C) 2020 Free Software Foundation, Inc.
+   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
+   <https://www.gnu.org/licenses/>.  */
+
+/* Enable DT_INIT/DT_FINI support.  */
+#define ELF_INITFINI 1
diff --git a/sysdeps/ia64/elf-initfini.h b/sysdeps/ia64/elf-initfini.h
new file mode 100644
index 0000000000..feccba6799
--- /dev/null
+++ b/sysdeps/ia64/elf-initfini.h
@@ -0,0 +1,20 @@
+/* Determine DT_INIT/DT_FINI support in the dynamic loader.  IA64 version.
+   Copyright (C) 2020 Free Software Foundation, Inc.
+   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
+   <https://www.gnu.org/licenses/>.  */
+
+/* Enable DT_INIT/DT_FINI support.  */
+#define ELF_INITFINI 1
diff --git a/sysdeps/init_array/elf-init.c b/sysdeps/init_array/elf-init.c
deleted file mode 100644
index b204bd1de9..0000000000
--- a/sysdeps/init_array/elf-init.c
+++ /dev/null
@@ -1,37 +0,0 @@
-/* Startup support for ELF initializers/finalizers in the main executable.
-   Copyright (C) 2013-2020 Free Software Foundation, Inc.
-   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.
-
-   In addition to the permissions in the GNU Lesser General Public
-   License, the Free Software Foundation gives you unlimited
-   permission to link the compiled version of this file with other
-   programs, and to distribute those programs without any restriction
-   coming from the use of this file. (The GNU Lesser General Public
-   License restrictions do apply in other respects; for example, they
-   cover modification of the file, and distribution when not linked
-   into another program.)
-
-   Note that people who make modified versions of this file are not
-   obligated to grant this special exception for their modified
-   versions; it is their choice whether to do so. The GNU Lesser
-   General Public License gives permission to release a modified
-   version without this exception; this exception also makes it
-   possible to release a modified version which carries forward this
-   exception.
-
-   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
-   <https://www.gnu.org/licenses/>.  */
-
-#define NO_INITFINI
-#include <csu/elf-init.c>
diff --git a/sysdeps/init_array/gmon-start.c b/sysdeps/init_array/gmon-start.c
deleted file mode 100644
index 20f51feafe..0000000000
--- a/sysdeps/init_array/gmon-start.c
+++ /dev/null
@@ -1,41 +0,0 @@
-/* gmon startup hook using .preinit_array.
-   Copyright (C) 2013-2020 Free Software Foundation, Inc.
-   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.
-
-   In addition to the permissions in the GNU Lesser General Public
-   License, the Free Software Foundation gives you unlimited
-   permission to link the compiled version of this file with other
-   programs, and to distribute those programs without any restriction
-   coming from the use of this file.  (The GNU Lesser General Public
-   License restrictions do apply in other respects; for example, they
-   cover modification of the file, and distribution when not linked
-   into another program.)
-
-   Note that people who make modified versions of this file are not
-   obligated to grant this special exception for their modified
-   versions; it is their choice whether to do so.  The GNU Lesser
-   General Public License gives permission to release a modified
-   version without this exception; this exception also makes it
-   possible to release a modified version which carries forward this
-   exception.
-
-   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
-   <https://www.gnu.org/licenses/>.  */
-
-/* Instead of defining __gmon_start__ globally in gcrt1.o, we make it
-   static and just put a pointer to it into the .preinit_array section.  */
-
-#define GMON_START_ARRAY_SECTION	".preinit_array"
-
-#include <csu/gmon-start.c>
diff --git a/sysdeps/m68k/elf-initfini.h b/sysdeps/m68k/elf-initfini.h
new file mode 100644
index 0000000000..103b402866
--- /dev/null
+++ b/sysdeps/m68k/elf-initfini.h
@@ -0,0 +1,20 @@
+/* Determine DT_INIT/DT_FINI support in the dynamic loader.  m68k version.
+   Copyright (C) 2020 Free Software Foundation, Inc.
+   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
+   <https://www.gnu.org/licenses/>.  */
+
+/* Enable DT_INIT/DT_FINI support.  */
+#define ELF_INITFINI 1
diff --git a/sysdeps/microblaze/elf-initfini.h b/sysdeps/microblaze/elf-initfini.h
new file mode 100644
index 0000000000..8fcb2cab0d
--- /dev/null
+++ b/sysdeps/microblaze/elf-initfini.h
@@ -0,0 +1,20 @@
+/* Determine DT_INIT/DT_FINI support in the dynamic loader, for Microblaze.
+   Copyright (C) 2020 Free Software Foundation, Inc.
+   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
+   <https://www.gnu.org/licenses/>.  */
+
+/* Enable DT_INIT/DT_FINI support.  */
+#define ELF_INITFINI 1
diff --git a/sysdeps/mips/elf-initfini.h b/sysdeps/mips/elf-initfini.h
new file mode 100644
index 0000000000..9e8b6eed83
--- /dev/null
+++ b/sysdeps/mips/elf-initfini.h
@@ -0,0 +1,20 @@
+/* Determine DT_INIT/DT_FINI support in the dynamic loader.  MIPS version.
+   Copyright (C) 2020 Free Software Foundation, Inc.
+   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
+   <https://www.gnu.org/licenses/>.  */
+
+/* Enable DT_INIT/DT_FINI support.  */
+#define ELF_INITFINI 1
diff --git a/sysdeps/nios2/elf-initfini.h b/sysdeps/nios2/elf-initfini.h
new file mode 100644
index 0000000000..498ca35b8e
--- /dev/null
+++ b/sysdeps/nios2/elf-initfini.h
@@ -0,0 +1,20 @@
+/* Determine DT_INIT/DT_FINI support in the dynamic loader.  nios2 version.
+   Copyright (C) 2020 Free Software Foundation, Inc.
+   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
+   <https://www.gnu.org/licenses/>.  */
+
+/* Enable DT_INIT/DT_FINI support.  */
+#define ELF_INITFINI 1
diff --git a/sysdeps/powerpc/elf-initfini.h b/sysdeps/powerpc/elf-initfini.h
new file mode 100644
index 0000000000..ca89f427f2
--- /dev/null
+++ b/sysdeps/powerpc/elf-initfini.h
@@ -0,0 +1,20 @@
+/* Determine DT_INIT/DT_FINI support in the dynamic loader, for powerpc.
+   Copyright (C) 2020 Free Software Foundation, Inc.
+   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
+   <https://www.gnu.org/licenses/>.  */
+
+/* Enable DT_INIT/DT_FINI support.  */
+#define ELF_INITFINI 1
diff --git a/sysdeps/riscv/Implies b/sysdeps/riscv/Implies
index c88325b8be..1945b1f4bb 100644
--- a/sysdeps/riscv/Implies
+++ b/sysdeps/riscv/Implies
@@ -1,5 +1,3 @@
-init_array
-
 ieee754/ldbl-128
 ieee754/dbl-64
 ieee754/flt-32
diff --git a/sysdeps/s390/elf-initfini.h b/sysdeps/s390/elf-initfini.h
new file mode 100644
index 0000000000..531c764ae2
--- /dev/null
+++ b/sysdeps/s390/elf-initfini.h
@@ -0,0 +1,20 @@
+/* Determine DT_INIT/DT_FINI support in the dynamic loader.  S/390 version.
+   Copyright (C) 2020 Free Software Foundation, Inc.
+   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
+   <https://www.gnu.org/licenses/>.  */
+
+/* Enable DT_INIT/DT_FINI support.  */
+#define ELF_INITFINI 1
diff --git a/sysdeps/sh/elf-initfini.h b/sysdeps/sh/elf-initfini.h
new file mode 100644
index 0000000000..0aeda572b2
--- /dev/null
+++ b/sysdeps/sh/elf-initfini.h
@@ -0,0 +1,20 @@
+/* Determine DT_INIT/DT_FINI support in the dynamic loader.  SH version.
+   Copyright (C) 2020 Free Software Foundation, Inc.
+   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
+   <https://www.gnu.org/licenses/>.  */
+
+/* Enable DT_INIT/DT_FINI support.  */
+#define ELF_INITFINI 1
diff --git a/sysdeps/sparc/elf-initfini.h b/sysdeps/sparc/elf-initfini.h
new file mode 100644
index 0000000000..e482fe6eca
--- /dev/null
+++ b/sysdeps/sparc/elf-initfini.h
@@ -0,0 +1,20 @@
+/* Determine DT_INIT/DT_FINI support in the dynamic loader.  SPARC version.
+   Copyright (C) 2020 Free Software Foundation, Inc.
+   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
+   <https://www.gnu.org/licenses/>.  */
+
+/* Enable DT_INIT/DT_FINI support.  */
+#define ELF_INITFINI 1
diff --git a/sysdeps/x86/elf-initfini.h b/sysdeps/x86/elf-initfini.h
new file mode 100644
index 0000000000..7a48ebda92
--- /dev/null
+++ b/sysdeps/x86/elf-initfini.h
@@ -0,0 +1,20 @@
+/* Determine DT_INIT/DT_FINI support in the dynamic loader.  x86 version.
+   Copyright (C) 2020 Free Software Foundation, Inc.
+   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
+   <https://www.gnu.org/licenses/>.  */
+
+/* Enable DT_INIT/DT_FINI support.  */
+#define ELF_INITFINI 1