Prepare for radical source tree reorganization.zack/build-layout-experiment

All top-level files and directories are moved into a temporary storage
directory, REORG.TODO, except for files that will certainly still
exist in their current form at top level when we're done (COPYING,
COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which
are moved to the new directory OldChangeLogs, instead), and the
generated file INSTALL (which is just deleted; in the new order, there
will be no generated files checked into version control).

1 files changed, 73 insertions, 0 deletions

diff --git a/REORG.TODO/elf/tst-tlsalign-extern.c b/REORG.TODO/elf/tst-tlsalign-extern.c
new file mode 100644
index 0000000000..11384d085e
--- /dev/null
+++ b/REORG.TODO/elf/tst-tlsalign-extern.c
@@ -0,0 +1,73 @@
+/* Test for large alignment in TLS blocks (extern case), BZ#18383.
+   Copyright (C) 2015-2017 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/>.  */
+
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+/* This is the same as tst-tlsalign-static.c, except that it uses
+   TLS variables that are defined in a separate translation unit
+   (ts-tlsalign-vars.c).  It turned out that the cause of BZ#18383
+   on ARM was actually an ARM assembler bug triggered by the ways of
+   using .tdata/.tbss sections and relocs referring to them that GCC
+   chooses when the variables are defined in the same translation
+   unit that contains the references.  */
+
+extern __thread int tdata1;
+extern __thread int tdata2;
+extern __thread int tdata3;
+extern __thread int tbss1;
+extern __thread int tbss2;
+extern __thread int tbss3;
+
+static int
+test_one (const char *which, unsigned int alignment, int *var, int value)
+{
+  uintptr_t addr = (uintptr_t) var;
+  unsigned int misalign = addr & (alignment - 1);
+
+  printf ("%s TLS address %p %% %u = %u\n",
+	  which, (void *) var, alignment, misalign);
+
+  int got = *var;
+  if (got != value)
+    {
+      printf ("%s value %d should be %d\n", which, got, value);
+      return 1;
+    }
+
+  return misalign != 0;
+}
+
+static int
+do_test (void)
+{
+  int fail = 0;
+
+  fail |= test_one ("tdata1", 4, &tdata1, 1);
+  fail |= test_one ("tdata2", 0x10, &tdata2, 2);
+  fail |= test_one ("tdata3", 0x1000, &tdata3, 4);
+
+  fail |= test_one ("tbss1", 4, &tbss1, 0);
+  fail |= test_one ("tbss2", 0x10, &tbss2, 0);
+  fail |= test_one ("tbss3", 0x1000, &tbss3, 0);
+
+  return fail ? EXIT_FAILURE : EXIT_SUCCESS;
+}
+
+#include <support/test-driver.c>