1 files changed, 67 insertions, 0 deletions
diff --git a/libitm/config/arm/hwcap.cc b/libitm/config/arm/hwcap.cc
new file mode 100644
index 00000000000..007c10e7a4e
--- /dev/null
+++ b/libitm/config/arm/hwcap.cc
@@ -0,0 +1,67 @@
+/* Copyright (C) 2011 Free Software Foundation, Inc.
+   Contributed by Richard Henderson <rth@redhat.com>.
+
+   This file is part of the GNU Transactional Memory Library (libitm).
+
+   Libitm is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   Libitm 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 General Public License for
+   more details.
+
+   Under Section 7 of GPL version 3, you are granted additional
+   permissions described in the GCC Runtime Library Exception, version
+   3.1, as published by the Free Software Foundation.
+
+   You should have received a copy of the GNU General Public License and
+   a copy of the GCC Runtime Library Exception along with this program;
+   see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* This file initializes GTM_hwcap in some os-specific way to indicate
+   what ISA extensions are present for ARM.  */
+
+#include "libitm_i.h"
+#include "hwcap.h"
+
+/* Begin by defaulting to whatever options were given to the compiler.  */
+int GTM_hwcap HIDDEN = 0
+#ifdef __VFP_FP__
+  | HWCAP_ARM_VFP
+#endif
+#ifdef __IWMMXT__
+  | HWCAP_ARM_IWMMXT
+#endif
+  ;
+
+#ifdef __linux__
+#include <unistd.h>
+#include <sys/fcntl.h>
+#include <elf.h>
+
+static void __attribute__((constructor))
+init_gtm_hwcap(void)
+{
+  int fd = open ("/proc/self/auxv", O_RDONLY);
+  if (fd < 0)
+    return;
+
+  Elf32_auxv_t pairs[512];
+  ssize_t rlen = read (fd, pairs, sizeof(pairs));
+  close (fd);
+  if (rlen < 0)
+    return;
+
+  size_t n = (size_t)rlen / sizeof(pairs[0]);
+  for (size_t i = 0; i < n; ++i)
+    if (pairs[i].a_type == AT_HWCAP)
+      {
+	GTM_hwcap = pairs[i].a_un.a_val;
+	return;
+      }
+}
+#endif