Add a testcase for copy reloc against protected data

Linkers in some versions of binutils 2.25 and 2.26 don't support protected
data symbol with error messsage like:

/usr/bin/ld: copy reloc against protected `bar' is invalid
/usr/bin/ld: failed to set dynamic section sizes: Bad value

We check if linker supports copy reloc against protected data symbol to
avoid running the test if linker is broken.

	[BZ #17711]
	* config.make.in (have-protected-data): New.
	* configure.ac: Check linker support for protected data symbol.
	* configure: Regenerated.
	* elf/Makefile (modules-names): Add tst-protected1moda and
	tst-protected1modb if $(have-protected-data) is yes.
	(tests): Add tst-protected1a and tst-protected1b if
	$(have-protected-data) is yes.
	($(objpfx)tst-protected1a): New.
	($(objpfx)tst-protected1b): Likewise.
	(tst-protected1modb.so-no-z-defs): Likewise.
	* elf/tst-protected1a.c: New file.
	* elf/tst-protected1b.c: Likewise.
	* elf/tst-protected1mod.h: Likewise.
	* elf/tst-protected1moda.c: Likewise.
	* elf/tst-protected1modb.c: Likewise.

1 files changed, 242 insertions, 0 deletions

diff --git a/elf/tst-protected1b.c b/elf/tst-protected1b.c
new file mode 100644
index 0000000000..56352c406f
--- /dev/null
+++ b/elf/tst-protected1b.c
@@ -0,0 +1,242 @@
+/* Test the protected visibility when main is linked with modb and moda
+   in that order:
+   1. Protected symbols, protected1, protected2 and protected3, defined
+      in moda, are used in moda.
+   2.  Protected symbol, protected3, defined in modb, are used in modb
+   3. Symbol, protected1, defined in modb, is used in main and modb.
+   4. Symbol, protected2, defined in main, is used in main.
+   5. Symbol, protected3, defined in modb, is also used in main.
+
+   Copyright (C) 2015 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/>.  */
+
+/* This file must be compiled as PIE to avoid copy relocation when
+   accessing protected symbols defined in shared libaries since copy
+   relocation doesn't work with protected symbols and linker in
+   binutils 2.26 enforces this rule.  */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "tst-protected1mod.h"
+
+/* Prototype for our test function.  */
+extern int do_test (void);
+
+int protected2 = -1;
+
+#define TEST_FUNCTION do_test ()
+
+/* This defines the `main' function and some more.  */
+#include <test-skeleton.c>
+
+int
+do_test (void)
+{
+  int res = 0;
+
+  /* Check if we get the same address for the protected data symbol.  */
+  if (&protected1 == protected1a_p ())
+    {
+      puts ("`protected1' in main and moda has  same address");
+      res = 1;
+    }
+  if (&protected1 != protected1b_p ())
+    {
+      puts ("`protected1' in main and modb doesn't have same address");
+      res = 1;
+    }
+
+  /* Check if we get the right value for the protected data symbol.  */
+  if (protected1 != -3)
+    {
+      puts ("`protected1' in main and modb doesn't have same value");
+      res = 1;
+    }
+
+  /* Check if we get the right value for data defined in executable.  */
+  if (protected2 != -1)
+    {
+      puts ("`protected2' in main has the wrong value");
+      res = 1;
+    }
+
+  /* Check `protected1' in moda.  */
+  if (!check_protected1 ())
+    {
+      puts ("`protected1' in moda has the wrong value");
+      res = 1;
+    }
+
+  /* Check `protected2' in moda.  */
+  if (!check_protected2 ())
+    {
+      puts ("`protected2' in moda has the wrong value");
+      res = 1;
+    }
+
+  /* Check if we get the same address for the protected data symbol.  */
+  if (&protected3 == protected3a_p ())
+    {
+      puts ("`protected3' in main and moda has same address");
+      res = 1;
+    }
+  if (&protected3 != protected3b_p ())
+    {
+      puts ("`protected3' in main and modb doesn't have same address");
+      res = 1;
+    }
+
+  /* Check if we get the right value for the protected data symbol.  */
+  if (protected3 != -5)
+    {
+      puts ("`protected3' in main and modb doesn't have same value");
+      res = 1;
+    }
+
+  /* Check `protected3' in moda.  */
+  if (!check_protected3a ())
+    {
+      puts ("`protected3' in moda has the wrong value");
+      res = 1;
+    }
+
+  /* Check `protected3' in modb.  */
+  if (!check_protected3b ())
+    {
+      puts ("`protected3' in modb has the wrong value");
+      res = 1;
+    }
+
+  /* Set `protected2' in moda to 30.  */
+  set_protected2 (300);
+
+  /* Check `protected2' in moda.  */
+  if (!check_protected2 ())
+    {
+      puts ("`protected2' in moda has the wrong value");
+      res = 1;
+    }
+
+  /* Check if we get the right value for data defined in executable.  */
+  if (protected2 != -1)
+    {
+      puts ("`protected2' in main has the wrong value");
+      res = 1;
+    }
+
+  /* Set `protected1' in moda to 30.  */
+  set_protected1a (30);
+
+  /* Check `protected1' in moda.  */
+  if (!check_protected1 ())
+    {
+      puts ("`protected1' in moda has the wrong value");
+      res = 1;
+    }
+
+  /* Check if we get the same value for the protected data symbol.  */
+  if (protected1 != -3)
+    {
+      puts ("`protected1' in main has the wrong value");
+      res = 1;
+    }
+
+  protected2 = -300;
+
+  /* Check `protected2' in moda.  */
+  if (!check_protected2 ())
+    {
+      puts ("`protected2' in moda has the wrong value");
+      res = 1;
+    }
+
+  /* Check if data defined in executable is changed.  */
+  if (protected2 != -300)
+    {
+      puts ("`protected2' in main is changed");
+      res = 1;
+    }
+
+  /* Set `protected1' in modb to 40.  */
+  set_protected1b (40);
+
+  /* Check `protected1' in moda.  */
+  if (!check_protected1 ())
+    {
+      puts ("`protected1' in moda has the wrong value");
+      res = 1;
+    }
+
+  /* Check if we get the updated value for the protected data symbol.  */
+  if (protected1 != 40)
+    {
+      puts ("`protected1' in main doesn't have the updated value");
+      res = 1;
+    }
+
+  /* Set `protected3' in moda to 80.  */
+  set_protected3a (80);
+
+  /* Check `protected3' in moda.  */
+  if (!check_protected3a ())
+    {
+      puts ("`protected3' in moda has the wrong value");
+      res = 1;
+    }
+
+  /* Check if we get the updated value for the protected data symbol.  */
+  if (protected3 != -5)
+    {
+      puts ("`protected3' in main doesn't have the updated value");
+      res = 1;
+    }
+
+  /* Check `protected3' in modb.  */
+  if (!check_protected3b ())
+    {
+      puts ("`protected3' in modb has the wrong value");
+      res = 1;
+    }
+
+  /* Set `protected3' in modb to 100.  */
+  set_protected3b (100);
+
+  /* Check `protected3' in moda.  */
+  if (!check_protected3a ())
+    {
+      puts ("`protected3' in moda has the wrong value");
+      res = 1;
+    }
+
+  /* Check if we get the updated value for the protected data symbol.  */
+  if (protected3 != 100)
+    {
+      puts ("`protected3' in main doesn't have the updated value");
+      res = 1;
+    }
+
+  /* Check `protected3' in modb.  */
+  if (!check_protected3b ())
+    {
+      puts ("`protected3' in modb has the wrong value");
+      res = 1;
+    }
+
+  return res;
+}