lp#726529: arm optimizations for ARM 6/7 and gcc < 4.6

2 files changed, 100 insertions, 0 deletions

diff --git a/sal/inc/osl/armarch.h b/sal/inc/osl/armarch.h
new file mode 100644
index 000000000000..ab50f5bac1cd
--- /dev/null
+++ b/sal/inc/osl/armarch.h
@@ -0,0 +1,63 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* -----------------------------------------------------------------------
+   Copyright (c) 1998, 2008 Red Hat, Inc.
+
+   Permission is hereby granted, free of charge, to any person obtaining
+   a copy of this software and associated documentation files (the
+   ``Software''), to deal in the Software without restriction, including
+   without limitation the rights to use, copy, modify, merge, publish,
+   distribute, sublicense, and/or sell copies of the Software, and to
+   permit persons to whom the Software is furnished to do so, subject to
+   the following conditions:
+
+   The above copyright notice and this permission notice shall be included
+   in all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND,
+   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+   NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+   HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+   WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+   DEALINGS IN THE SOFTWARE.
+   ----------------------------------------------------------------------- */
+
+// shamelessly copied from libffi src/arm/sysv.h
+#ifndef _OSL_ARMARCH_H_
+#define _OSL_ARMARCH_H_
+#ifdef ARM
+
+#define __ARM_ARCH__ 3
+
+#if defined(__ARM_ARCH_4__) || defined(__ARM_ARCH_4T__)
+# undef __ARM_ARCH__
+# define __ARM_ARCH__ 4
+#endif
+
+#if defined(__ARM_ARCH_5__) || defined(__ARM_ARCH_5T__) \
+    || defined(__ARM_ARCH_5E__) || defined(__ARM_ARCH_5TE__) \
+    || defined(__ARM_ARCH_5TEJ__)
+# undef __ARM_ARCH__
+# define __ARM_ARCH__ 5
+#endif
+
+#if defined(__ARM_ARCH_6__) || defined(__ARM_ARCH_6J__) \
+    || defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6Z__) \
+    || defined(__ARM_ARCH_6ZK__) || defined(__ARM_ARCH_6T2__) \
+    || defined(__ARM_ARCH_6M__)
+# undef __ARM_ARCH__
+# define __ARM_ARCH__ 6
+#endif
+
+#if defined(__ARM_ARCH_7__) || defined(__ARM_ARCH_7A__) \
+    || defined(__ARM_ARCH_7R__) || defined(__ARM_ARCH_7M__)
+# undef __ARM_ARCH__
+# define __ARM_ARCH__ 7
+#endif
+
+#endif
+#endif
+
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/sal/osl/unx/interlck.c b/sal/osl/unx/interlck.c
index 6345279680b3..8109f6eba10d 100644
--- a/sal/osl/unx/interlck.c
+++ b/sal/osl/unx/interlck.c
@@ -29,6 +29,7 @@
 
 #include "system.h"
 
+#include <osl/armarch.h>
 #include <osl/interlck.h>
 #include <osl/diagnose.h>
 
@@ -36,6 +37,42 @@
 #error please use asm/interlck_sparc.s
 #elif defined ( SOLARIS) && defined ( X86 )
 #error please use asm/interlck_x86.s
+#elif defined ( ARM ) && (( __GNUC__ < 4 ) || (( __GNUC__ == 4) && ( __GNUC_MINOR__ < 6 ))) && ( __ARM_ARCH__ >= 6)
+oslInterlockedCount SAL_CALL osl_incrementInterlockedCount(oslInterlockedCount* pCount)
+{
+    register oslInterlockedCount nCount __asm__ ("r1");
+    int nResult;
+
+    __asm__ __volatile__ (
+"1:   ldrex %0, [%3]\n"
+"     add %0, %0, #1\n"
+"     strex %1, %0, [%3]\n"
+"     teq %1, #0\n"
+"     bne 1b"
+        : "=&r" (nCount), "=&r" (nResult), "=m" (*pCount)
+        : "r" (pCount)
+        : "memory");
+
+    return nCount;
+}
+
+oslInterlockedCount SAL_CALL osl_decrementInterlockedCount(oslInterlockedCount* pCount)
+{
+    register oslInterlockedCount nCount __asm__ ("r1");
+    int nResult;
+
+    __asm__ __volatile__ (
+"0:   ldrex %0, [%3]\n"
+"     sub %0, %0, #1\n"
+"     strex %1, %0, [%3]\n"
+"     teq %1, #0\n"
+"     bne 0b"
+        : "=&r" (nCount), "=&r" (nResult), "=m" (*pCount)
+        : "r" (pCount)
+        : "memory");
+
+    return nCount;
+}
 #elif defined ( GCC ) && ( defined ( X86 ) || defined ( X86_64 ) )
 /* That's possible on x86-64 too since oslInterlockedCount is a sal_Int32 */