Commonize csu code for elf systems, powerpc now no longer has it's own

versions of these files.

Fixed a bug in ld.so in this, instead of scheduling the fini of each of
the shared libraries with atexit. schedule a function of ld.so itself
and it will walk all of the open libraries when the program exits.
otherwise a shared library could be dl_open()ed and then dl_close()d
and then it would not be mapped for the atexit processing.

TODO:
What if atexit is not found (process did not link against libc?)
Do shared libraries that are dl_closed have their global destructors run?

2 files changed, 112 insertions, 0 deletions

diff --git a/lib/csu/common_elf/crtbeginS.c b/lib/csu/common_elf/crtbeginS.c
new file mode 100644
index 00000000000..6945484f55c
--- /dev/null
+++ b/lib/csu/common_elf/crtbeginS.c
@@ -0,0 +1,103 @@
+/*	$OpenBSD: crtbeginS.c,v 1.1 2001/05/28 21:38:13 drahn Exp $	*/
+/*	$NetBSD: crtbegin.c,v 1.1 1996/09/12 16:59:03 cgd Exp $	*/
+
+/*
+ * Copyright (c) 1993 Paul Kranenburg
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *      This product includes software developed by Paul Kranenburg.
+ * 4. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * Run-time module for GNU C++ compiled shared libraries.
+ *
+ * The linker constructs the following arrays of pointers to global
+ * constructors and destructors. The first element contains the
+ * number of pointers in each.
+ * The tables are also null-terminated.
+
+ */
+#include <stdlib.h>
+
+static void (*__CTOR_LIST__[0]) __P((void))
+    __attribute__((section(".ctors"))) = { (void *)-1 };	/* XXX */
+static void (*__DTOR_LIST__[0]) __P((void))
+    __attribute__((section(".dtors"))) = { (void *)-1 };	/* XXX */
+
+static void	__dtors __P((void));
+static void	__ctors __P((void));
+
+void
+__dtors()
+{
+	unsigned long i = (unsigned long) __DTOR_LIST__[0];
+	void (**p)(void);
+
+	if (i == -1)  {
+		for (i = 1; __DTOR_LIST__[i] != NULL; i++)
+			;
+		i--;
+	}
+	p = __DTOR_LIST__ + i;
+	while (i--) {
+		(**p--)();
+	}
+}
+
+static void
+__ctors()
+{
+	void (**p)(void) = __CTOR_LIST__ + 1;
+
+	while (*p) {
+		(**p++)();
+	}
+}
+
+void
+_init()
+{
+	static int initialized = 0;
+
+	/*
+	 * Call global constructors.
+	 * Arrange to call global destructors at exit.
+	 */
+	if (!initialized) {
+		initialized = 1;
+		__ctors();
+	}
+}
+
+void
+_fini()
+{
+	/*
+	 * since the _init() function sets up the destructors to be called
+	 * by atexit, do not call the destructors here.
+	 */
+	__dtors();
+}
diff --git a/lib/csu/common_elf/crtendS.c b/lib/csu/common_elf/crtendS.c
new file mode 100644
index 00000000000..2b3dbb174a1
--- /dev/null
+++ b/lib/csu/common_elf/crtendS.c
@@ -0,0 +1,9 @@
+/*	$OpenBSD: crtendS.c,v 1.1 2001/05/28 21:38:13 drahn Exp $	*/
+/*	$NetBSD: crtend.c,v 1.1 1997/04/16 19:38:24 thorpej Exp $	*/
+
+#include <sys/cdefs.h>
+
+static void (*__CTOR_LIST__[1]) __P((void))
+    __attribute__((section(".ctors"))) = { (void *)0 };		/* XXX */
+static void (*__DTOR_LIST__[1]) __P((void))
+    __attribute__((section(".dtors"))) = { (void *)0 };		/* XXX */