BZ#18383: Another test case, with TLS refs and defs in separate TUs.

1 files changed, 74 insertions, 0 deletions

diff --git a/elf/tst-tlsalign-extern.c b/elf/tst-tlsalign-extern.c
new file mode 100644
index 0000000000..661b6712e3
--- /dev/null
+++ b/elf/tst-tlsalign-extern.c
@@ -0,0 +1,74 @@
+/* Test for large alignment in TLS blocks (extern case), BZ#18383.
+   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/>.  */
+
+#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;
+}
+
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"