X-Git-Url: http://wien.tomnetworks.com/gitweb/?p=hs-boehmgc.git;a=blobdiff_plain;f=gc-7.2%2Flibatomic_ops%2Fsrc%2Fatomic_ops%2Fsysdeps%2Fmsftc%2Farm.h;fp=gc-7.2%2Flibatomic_ops%2Fsrc%2Fatomic_ops%2Fsysdeps%2Fmsftc%2Farm.h;h=36e45f0463a7160ca2aa1d91004e12e508d2b4a1;hp=0000000000000000000000000000000000000000;hb=324587ba93dc77f37406d41fd2a20d0e0d94fb1d;hpb=2a4ea609491b225a1ceb06da70396e93916f137a

diff --git a/gc-7.2/libatomic_ops/src/atomic_ops/sysdeps/msftc/arm.h b/gc-7.2/libatomic_ops/src/atomic_ops/sysdeps/msftc/arm.h
new file mode 100644
index 0000000..36e45f0
--- /dev/null
+++ b/gc-7.2/libatomic_ops/src/atomic_ops/sysdeps/msftc/arm.h
@@ -0,0 +1,90 @@
+/*
+ * Copyright (c) 2003 Hewlett-Packard Development Company, L.P.
+ *
+ * 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.
+ */
+
+#include "../read_ordered.h"
+
+#ifndef AO_ASSUME_WINDOWS98
+  /* CAS is always available */
+# define AO_ASSUME_WINDOWS98
+#endif
+#include "common32_defs.h"
+/* FIXME: Do _InterlockedOps really have a full memory barrier?         */
+/* (MSDN WinCE docs say nothing about it.)                              */
+
+#if _M_ARM >= 6
+/* ARMv6 is the first architecture providing support for simple LL/SC.  */
+
+#include "../standard_ao_double_t.h"
+
+/* If only a single processor is used, we can define AO_UNIPROCESSOR    */
+/* and do not need to access CP15 for ensuring a DMB at all.            */
+#ifdef AO_UNIPROCESSOR
+  AO_INLINE void AO_nop_full(void) {}
+# define AO_HAVE_nop_full
+#else
+/* AO_nop_full() is emulated using AO_test_and_set_full().              */
+#endif
+
+#include "../test_and_set_t_is_ao_t.h"
+/* AO_test_and_set() is emulated using CAS.                             */
+
+AO_INLINE AO_t
+AO_load(const volatile AO_t *addr)
+{
+  /* Cast away the volatile in case it adds fence semantics */
+  return (*(const AO_t *)addr);
+}
+#define AO_HAVE_load
+
+AO_INLINE void
+AO_store_full(volatile AO_t *addr, AO_t value)
+{
+  /* Emulate atomic store using CAS.    */
+  AO_t old = AO_load(addr);
+  AO_t current;
+# ifdef AO_OLD_STYLE_INTERLOCKED_COMPARE_EXCHANGE
+    while ((current = (AO_t)_InterlockedCompareExchange(
+                                (PVOID AO_INTERLOCKED_VOLATILE *)addr,
+                                (PVOID)value, (PVOID)old)) != old)
+      old = current;
+# else
+    while ((current = (AO_t)_InterlockedCompareExchange(
+                                (LONG AO_INTERLOCKED_VOLATILE *)addr,
+                                (LONG)value, (LONG)old)) != old)
+      old = current;
+# endif
+}
+#define AO_HAVE_store_full
+
+/* FIXME: implement AO_compare_double_and_swap_double() */
+
+#else /* _M_ARM < 6 */
+
+/* Some slide set, if it has been red correctly, claims that Loads      */
+/* followed by either a Load or a Store are ordered, but nothing        */
+/* else is. It appears that SWP is the only simple memory barrier.      */
+#include "../all_atomic_load_store.h"
+
+#include "../test_and_set_t_is_ao_t.h"
+/* AO_test_and_set_full() is emulated using CAS.                        */
+
+#endif /* _M_ARM < 6 */