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patch to make init_array work


The init_array support in glibc appears to be incomplete at the
moment.  HJ had a patch that made it all work (see
http://sources.redhat.com/ml/libc-alpha/2002-03/msg00047.html) and I
adapted his work for the current CVS tree.  With the patch below
applied, the included test cases work properly.

Please apply this patch.

Thanks,

	--david

2002-03-12  H.J. Lu  <hjl@gnu.org>

	* csu/init.c (__libc_preinit_array): New. Define if
	HAVE_INITFINI_ARRAY is defined.
	(__libc_init_array): Likewise.
	(__libc_fini_array): Likewise.

	* elf/Makefile (tests): Add tst-array1, tst-array2 and
	tst-array3 if $(have-initfini-array) is yes.
	(tests-static): Add tst-array3 if $(have-initfini-array) is
	yes.
	(modules-names): Add tst-array2dep if $(have-initfini-array)
	is yes.
	($(objpfx)tst-array1.out): New target.
	($(objpfx)tst-array2): Likewise.
	($(objpfx)tst-array2.out): Likewise.
	($(objpfx)tst-array3.out): Likewise.

	* elf/tst-array1.c: New file.
	* elf/tst-array1.exp: Likewise.
	* elf/tst-array2.c: Likewise.
	* elf/tst-array2dep.c: Likewise.
	* elf/tst-array2.exp: Likewise.
	* elf/tst-array3.c: Likewise.

	* sysdeps/generic/libc-start.c (__libc_start_main): Process
	__libc_preinit_array, __libc_init_array and __libc_fini_array
	if HAVE_INITFINI_ARRAY is defined.

Index: csu/init.c
===================================================================
RCS file: /cvs/glibc/libc/csu/init.c,v
retrieving revision 1.4
diff -u -r1.4 init.c
--- csu/csu/init.c	6 Jul 2001 04:54:45 -0000	1.4
+++ csu/csu/init.c	23 Oct 2002 01:34:29 -0000
@@ -25,3 +25,43 @@
 const int _IO_stdin_used = _G_IO_IO_FILE_VERSION;
 
 #endif
+
+#ifdef HAVE_INITFINI_ARRAY
+extern void (*__preinit_array_start []) (void);
+extern void (*__preinit_array_end []) (void);
+
+void
+__libc_preinit_array (void)
+{
+  unsigned int size, i;
+
+  size = __preinit_array_end - __preinit_array_start;
+  for (i = 0; i < size; i++)
+    __preinit_array_start [i] ();
+}
+
+extern void (*__init_array_start []) (void);
+extern void (*__init_array_end []) (void);
+
+void
+__libc_init_array (void)
+{
+  unsigned int size, i;
+
+  size =  __init_array_end - __init_array_start;
+  for (i = 0; i < size; i++)
+    __init_array_start [i] ();
+}
+
+extern void (*__fini_array_start []) (void);
+extern void (*__fini_array_end []) (void);
+
+void
+__libc_fini_array (void)
+{
+  int i;
+
+  for (i = __fini_array_end - __fini_array_start - 1; i >= 0; i--)
+    __fini_array_start [i] ();
+}
+#endif
Index: elf/Makefile
===================================================================
RCS file: /cvs/glibc/libc/elf/Makefile,v
retrieving revision 1.241
diff -u -r1.241 Makefile
--- elf/elf/Makefile	22 Oct 2002 06:22:38 -0000	1.241
+++ elf/elf/Makefile	23 Oct 2002 01:34:29 -0000
@@ -117,6 +117,9 @@
 endif
 
 tests = tst-tls1 tst-tls2 tst-tls9
+ifeq (yes,$(have-initfini-array))
+tests += tst-array1 tst-array2 tst-array3
+endif
 ifeq (yes,$(build-static))
 tests-static = tst-tls1-static tst-tls2-static
 ifeq (yesyesyes,$(build-static)$(build-shared)$(elf))
@@ -156,6 +159,9 @@
 		tst-tlsmod5 tst-tlsmod6 \
 		circlemod1 circlemod1a circlemod2 circlemod2a \
 		circlemod3 circlemod3a
+ifeq (yes,$(have-initfini-array))
+modules-names += tst-array2dep
+endif
 modules-vis-yes = vismod1 vismod2 vismod3
 modules-nodelete-yes = nodelmod1 nodelmod2 nodelmod3 nodelmod4
 modules-nodlopen-yes = nodlopenmod nodlopenmod2
@@ -541,3 +547,22 @@
 $(objpfx)tst-tls9-static: $(common-objpfx)dlfcn/libdl.a
 $(objpfx)tst-tls9-static.out: $(objpfx)tst-tlsmod5.so $(objpfx)tst-tlsmod6.so
 endif
+
+$(objpfx)tst-array1.out: $(objpfx)tst-array1
+	$(elf-objpfx)$(rtld-installed-name) \
+	  --library-path $(rpath-link)$(patsubst %,:%,$(sysdep-library-path)) \
+	  $(objpfx)tst-array1 > $@
+	cmp $@ tst-array1.exp > /dev/null
+
+$(objpfx)tst-array2: $(objpfx)tst-array2dep.so
+$(objpfx)tst-array2.out: $(objpfx)tst-array2
+	$(elf-objpfx)$(rtld-installed-name) \
+	  --library-path $(rpath-link)$(patsubst %,:%,$(sysdep-library-path)) \
+	  $(objpfx)tst-array2 > $@
+	cmp $@ tst-array2.exp > /dev/null
+
+$(objpfx)tst-array3.out: $(objpfx)tst-array3
+	$(elf-objpfx)$(rtld-installed-name) \
+	  --library-path $(rpath-link)$(patsubst %,:%,$(sysdep-library-path)) \
+	  $(objpfx)tst-array3 > $@
+	cmp $@ tst-array1.exp > /dev/null
Index: elf/tst-array1.c
===================================================================
RCS file: elf/tst-array1.c
diff -N elf/tst-array1.c
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ elf/elf/tst-array1.c	23 Oct 2002 01:34:29 -0000
@@ -0,0 +1,101 @@
+#include <unistd.h>
+
+static void init (void) __attribute__ ((constructor));
+
+static void
+init (void)
+{
+  write (STDOUT_FILENO, "init\n", 5);
+}
+
+static void fini (void) __attribute__ ((destructor));
+
+static void
+fini (void)
+{
+  write (STDOUT_FILENO, "fini\n", 5);
+}
+
+static void
+preinit_0 (void)
+{
+  write (STDOUT_FILENO, "preinit array 0\n", 16);
+}
+
+static void
+preinit_1 (void)
+{
+  write (STDOUT_FILENO, "preinit array 1\n", 16);
+}
+
+static void
+preinit_2 (void)
+{
+  write (STDOUT_FILENO, "preinit array 2\n", 16);
+}
+
+void
+(*preinit_array []) (void) __attribute__ ((section (".preinit_array"))) =
+{
+  &preinit_0,
+  &preinit_1,
+  &preinit_2
+};
+
+static void
+init_0 (void)
+{
+  write (STDOUT_FILENO, "init array 0\n", 13);
+}
+
+static void
+init_1 (void)
+{
+  write (STDOUT_FILENO, "init array 1\n", 13);
+}
+
+static void
+init_2 (void)
+{
+  write (STDOUT_FILENO, "init array 2\n", 13);
+}
+
+void
+(*init_array []) (void) __attribute__ ((section (".init_array"))) =
+{
+  &init_0,
+  &init_1,
+  &init_2
+};
+
+static void
+fini_0 (void)
+{
+  write (STDOUT_FILENO, "fini array 0\n", 13);
+}
+
+static void
+fini_1 (void)
+{
+  write (STDOUT_FILENO, "fini array 1\n", 13);
+}
+
+static void
+fini_2 (void)
+{
+  write (STDOUT_FILENO, "fini array 2\n", 13);
+}
+
+void
+(*fini_array []) (void) __attribute__ ((section (".fini_array"))) =
+{
+  &fini_0,
+  &fini_1,
+  &fini_2
+};
+
+int
+main (void)
+{
+  return 0;
+}
Index: elf/tst-array1.exp
===================================================================
RCS file: elf/tst-array1.exp
diff -N elf/tst-array1.exp
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ elf/elf/tst-array1.exp	23 Oct 2002 01:34:29 -0000
@@ -0,0 +1,11 @@
+preinit array 0
+preinit array 1
+preinit array 2
+init
+init array 0
+init array 1
+init array 2
+fini array 2
+fini array 1
+fini array 0
+fini
Index: elf/tst-array2.c
===================================================================
RCS file: elf/tst-array2.c
diff -N elf/tst-array2.c
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ elf/elf/tst-array2.c	23 Oct 2002 01:34:29 -0000
@@ -0,0 +1 @@
+#include "tst-array1.c"
Index: elf/tst-array2.exp
===================================================================
RCS file: elf/tst-array2.exp
diff -N elf/tst-array2.exp
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ elf/elf/tst-array2.exp	23 Oct 2002 01:34:29 -0000
@@ -0,0 +1,19 @@
+preinit array 0
+preinit array 1
+preinit array 2
+DSO init
+DSO init array 0
+DSO init array 1
+DSO init array 2
+init
+init array 0
+init array 1
+init array 2
+fini array 2
+fini array 1
+fini array 0
+fini
+DSO fini array 2
+DSO fini array 1
+DSO fini array 0
+DSO fini
Index: elf/tst-array2dep.c
===================================================================
RCS file: elf/tst-array2dep.c
diff -N elf/tst-array2dep.c
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ elf/elf/tst-array2dep.c	23 Oct 2002 01:34:29 -0000
@@ -0,0 +1,69 @@
+#include <unistd.h>
+
+static void init (void) __attribute__ ((constructor));
+
+static void
+init (void)
+{
+  write (STDOUT_FILENO, "DSO init\n", 9);
+}
+
+static void fini (void) __attribute__ ((destructor));
+
+static void
+fini (void)
+{
+  write (STDOUT_FILENO, "DSO fini\n", 9);
+}
+
+static void
+init_0 (void)
+{
+  write (STDOUT_FILENO, "DSO init array 0\n", 17);
+}
+
+static void
+init_1 (void)
+{
+  write (STDOUT_FILENO, "DSO init array 1\n", 17);
+}
+
+static void
+init_2 (void)
+{
+  write (STDOUT_FILENO, "DSO init array 2\n", 17);
+}
+
+void
+(*init_array []) (void) __attribute__ ((section (".init_array"))) =
+{
+  &init_0,
+  &init_1,
+  &init_2
+};
+
+static void
+fini_0 (void)
+{
+  write (STDOUT_FILENO, "DSO fini array 0\n", 17);
+}
+
+static void
+fini_1 (void)
+{
+  write (STDOUT_FILENO, "DSO fini array 1\n", 17);
+}
+
+static void
+fini_2 (void)
+{
+  write (STDOUT_FILENO, "DSO fini array 2\n", 17);
+}
+
+void
+(*fini_array []) (void) __attribute__ ((section (".fini_array"))) =
+{
+  &fini_0,
+  &fini_1,
+  &fini_2
+};
Index: elf/tst-array3.c
===================================================================
RCS file: elf/tst-array3.c
diff -N elf/tst-array3.c
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ elf/elf/tst-array3.c	23 Oct 2002 01:34:29 -0000
@@ -0,0 +1 @@
+#include "tst-array1.c"
Index: sysdeps/generic/libc-start.c
===================================================================
RCS file: /cvs/glibc/libc/sysdeps/generic/libc-start.c,v
retrieving revision 1.31
diff -u -r1.31 libc-start.c
--- sysdeps/generic/sysdeps/generic/libc-start.c	15 Sep 2002 05:44:24 -0000	1.31
+++ sysdeps/generic/sysdeps/generic/libc-start.c	23 Oct 2002 01:34:30 -0000
@@ -38,6 +38,16 @@
      ;
 #endif
 
+#ifdef HAVE_INITFINI_ARRAY
+# ifdef SHARED
+extern void __libc_init_array (void) __attribute__ ((weak));
+extern void __libc_fini_array (void) __attribute__ ((weak));
+# else
+extern void __libc_preinit_array (void);
+extern void __libc_init_array (void);
+extern void __libc_fini_array (void);
+# endif
+#endif
 
 extern int BP_SYM (__libc_start_main) (int (*main) (int, char **, char **),
 				       int argc,
@@ -122,6 +132,17 @@
   if (fini)
     __cxa_atexit ((void (*) (void *)) fini, NULL, NULL);
 
+#ifdef HAVE_INITFINI_ARRAY
+# ifdef SHARED
+  if (__libc_fini_array)
+# endif
+    __cxa_atexit ((void (*) (void *)) __libc_fini_array, NULL, NULL);
+
+# ifndef SHARED
+  __libc_preinit_array ();
+# endif
+#endif
+
   /* Call the initializer of the program, if any.  */
 #ifdef SHARED
   if (__builtin_expect (GL(dl_debug_mask) & DL_DEBUG_IMPCALLS, 0))
@@ -129,6 +150,13 @@
 #endif
   if (init)
     (*init) ();
+
+#ifdef HAVE_INITFINI_ARRAY
+# ifdef SHARED
+  if (__libc_init_array)
+# endif
+    __libc_init_array ();
+#endif
 
 #ifdef SHARED
   if (__builtin_expect (GL(dl_debug_mask) & DL_DEBUG_IMPCALLS, 0))


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