Enable functional DSO object destruction

Unfortunately, legacy .so files for ARM don't have a correct crtbegin file.
Consequently, we have to grandfather the old __dso_handle behaviour.
Add some ifdefs for ARM to allow it to use the old code until we can work
out a transition.

Change-Id: I6a28f368267d792c94e1d985d8344023bc632f6f
Author: H.J. Lu <hongjiu.lu@intel.com>
Signed-off-by: Bruce Beare <bruce.j.beare@intel.com>

libc/arch-arm/bionic/atexit.S

@@ -0,0 +1,69 @@
+/*
+ * Copyright (C) 2011 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "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
+ * COPYRIGHT OWNER OR CONTRIBUTORS 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.
+ */
+
+#ifndef CRT_LEGACY_WORKAROUND
+	.arch armv5te
+	.fpu softvfp
+	.eabi_attribute 20, 1
+	.eabi_attribute 21, 1
+	.eabi_attribute 23, 3
+	.eabi_attribute 24, 1
+	.eabi_attribute 25, 1
+	.eabi_attribute 26, 2
+	.eabi_attribute 30, 4
+	.eabi_attribute 18, 4
+	.code	16
+	.section	.text.atexit,"ax",%progbits
+	.align	2
+	.global	atexit
+	.hidden	atexit
+	.code	16
+	.thumb_func
+	.type	atexit, %function
+atexit:
+	.fnstart
+.LFB0:
+	.save	{r4, lr}
+	push	{r4, lr}
+.LCFI0:
+	ldr	r3, .L3
+	mov	r1, #0
+	@ sp needed for prologue
+.LPIC0:
+	add	r3, pc
+	ldr	r2, [r3]
+	bl	__cxa_atexit
+	pop	{r4, pc}
+.L4:
+	.align	2
+.L3:
+	.word	__dso_handle-(.LPIC0+4)
+.LFE0:
+	.fnend
+	.size	atexit, .-atexit
+#endif

libc/arch-arm/bionic/crtbegin_dynamic.S

@@ -85,3 +85,4 @@ __CTOR_LIST__:
 	.long -1
 
 #include "__dso_handle.S"
+#include "atexit.S"

libc/arch-arm/bionic/crtbegin_so.S

@@ -52,4 +52,10 @@ __FINI_ARRAY__:
         .long -1
         .long __on_dlclose
 
+#ifdef CRT_LEGACY_WORKAROUND
 #include "__dso_handle.S"
+#else
+#include "__dso_handle_so.S"
+#endif
+
+#include "atexit.S"

libc/arch-arm/bionic/crtbegin_static.S

@@ -86,3 +86,4 @@ __CTOR_LIST__:
 
 
 #include "__dso_handle.S"
+#include "atexit.S"