Imported gcc-4.4.3

[msp430-gcc.git] / libgomp / config / linux / alpha / futex.h

diff --git a/libgomp/config/linux/alpha/futex.h b/libgomp/config/linux/alpha/futex.h
new file mode 100644 (file)
index 0000000..a594d16
--- /dev/null
+++ b/libgomp/config/linux/alpha/futex.h
@@ -0,0 +1,109 @@
+/* Copyright (C) 2005, 2008, 2009 Free Software Foundation, Inc.
+   Contributed by Richard Henderson <rth@redhat.com>.
+
+   This file is part of the GNU OpenMP Library (libgomp).
+
+   Libgomp 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, or (at your option)
+   any later version.
+
+   Libgomp 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/>.  */
+
+/* Provide target-specific access to the futex system call.  */
+
+#ifndef SYS_futex
+#define SYS_futex               394
+#endif
+
+
+static inline void
+futex_wait (int *addr, int val)
+{
+  register long sc_0 __asm__("$0");
+  register long sc_16 __asm__("$16");
+  register long sc_17 __asm__("$17");
+  register long sc_18 __asm__("$18");
+  register long sc_19 __asm__("$19");
+
+  sc_0 = SYS_futex;
+  sc_16 = (long) addr;
+  sc_17 = gomp_futex_wait;
+  sc_18 = val;
+  sc_19 = 0;
+  __asm volatile ("callsys"
+                 : "=r" (sc_0), "=r"(sc_19)
+                 : "0"(sc_0), "r" (sc_16), "r"(sc_17), "r"(sc_18), "1"(sc_19)
+                 : "$1", "$2", "$3", "$4", "$5", "$6", "$7", "$8",
+                   "$22", "$23", "$24", "$25", "$27", "$28", "memory");
+  if (__builtin_expect (sc_19, 0) && sc_0 == ENOSYS)
+    {
+      gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG;
+      gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG;
+      sc_0 = SYS_futex;
+      sc_17 &= ~FUTEX_PRIVATE_FLAG;
+      sc_19 = 0;
+      __asm volatile ("callsys"
+                     : "=r" (sc_0), "=r"(sc_19)
+                     : "0"(sc_0), "r" (sc_16), "r"(sc_17), "r"(sc_18),
+                       "1"(sc_19)
+                     : "$1", "$2", "$3", "$4", "$5", "$6", "$7", "$8",
+                       "$22", "$23", "$24", "$25", "$27", "$28", "memory");
+    }
+}
+
+static inline void
+futex_wake (int *addr, int count)
+{
+  register long sc_0 __asm__("$0");
+  register long sc_16 __asm__("$16");
+  register long sc_17 __asm__("$17");
+  register long sc_18 __asm__("$18");
+  register long sc_19 __asm__("$19");
+
+  sc_0 = SYS_futex;
+  sc_16 = (long) addr;
+  sc_17 = gomp_futex_wake;
+  sc_18 = count;
+  __asm volatile ("callsys"
+                 : "=r" (sc_0), "=r"(sc_19)
+                 : "0"(sc_0), "r" (sc_16), "r"(sc_17), "r"(sc_18)
+                 : "$1", "$2", "$3", "$4", "$5", "$6", "$7", "$8",
+                   "$22", "$23", "$24", "$25", "$27", "$28", "memory");
+  if (__builtin_expect (sc_19, 0) && sc_0 == ENOSYS)
+    {
+      gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG;
+      gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG;
+      sc_0 = SYS_futex;
+      sc_17 &= ~FUTEX_PRIVATE_FLAG;
+      __asm volatile ("callsys"
+                     : "=r" (sc_0), "=r"(sc_19)
+                     : "0"(sc_0), "r" (sc_16), "r"(sc_17), "r"(sc_18)
+                     : "$1", "$2", "$3", "$4", "$5", "$6", "$7", "$8",
+                       "$22", "$23", "$24", "$25", "$27", "$28", "memory");
+    }
+}
+
+static inline void
+cpu_relax (void)
+{
+  __asm volatile ("" : : : "memory");
+}
+
+static inline void
+atomic_write_barrier (void)
+{
+  __asm volatile ("wmb" : : : "memory");
+}