powerpc: Move cache line size to rtld_global_ro

GCC 10.0 enabled -fno-common by default and this started to point that
__cache_line_size had been implemented in 2 different places: loader and
libc.

In order to avoid this duplication, the libc variable has been removed
and the loader variable is moved to rtld_global_ro.

File sysdeps/unix/sysv/linux/powerpc/dl-auxv.h has been added in order
to reuse code for both static and dynamic linking scenarios.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>

1 files changed, 54 insertions, 0 deletions

diff --git a/sysdeps/powerpc/tst-cache-ppc-static-dlopen.c b/sysdeps/powerpc/tst-cache-ppc-static-dlopen.c
new file mode 100644
index 0000000000..296d0f4397
--- /dev/null
+++ b/sysdeps/powerpc/tst-cache-ppc-static-dlopen.c
@@ -0,0 +1,54 @@
+/* Test dl_cache_line_size from a dlopen'ed DSO from a static executable.
+   Copyright (C) 2020 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
+   <https://www.gnu.org/licenses/>.  */
+
+#include <dlfcn.h>
+#include <stdio.h>
+#include <errno.h>
+
+int test_cache(int *);
+
+static int
+do_test (void)
+{
+  int ret;
+  void *handle;
+  int (*test_cache) (int *);
+
+  handle = dlopen ("mod-cache-ppc.so", RTLD_LAZY | RTLD_LOCAL);
+  if (handle == NULL)
+    {
+      printf ("dlopen (mod-cache-ppc.so): %s\n", dlerror ());
+      return 1;
+    }
+
+  test_cache = dlsym (handle, "test_cache");
+  if (test_cache == NULL)
+    {
+      printf ("dlsym (test_cache): %s\n", dlerror ());
+      return 1;
+    }
+
+  ret = test_cache(&errno);
+
+  test_cache = NULL;
+  dlclose (handle);
+
+  return ret;
+}
+
+#include <support/test-driver.c>