Imported gcc-4.4.3

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

diff --git a/libgomp/config/linux/mips/futex.h b/libgomp/config/linux/mips/futex.h
new file mode 100644 (file)
index 0000000..576ada4
--- /dev/null
+++ b/libgomp/config/linux/mips/futex.h
@@ -0,0 +1,72 @@
+/* Copyright (C) 2005, 2008, 2009 Free Software Foundation, Inc.
+   Contributed by Ilie Garbacea <ilie@mips.com>, Chao-ying Fu <fu@mips.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.  */
+
+#include <sys/syscall.h>
+#define FUTEX_WAIT 0
+#define FUTEX_WAKE 1
+
+static inline void
+sys_futex0 (int *addr, int op, int val)
+{
+  register unsigned long __v0 asm("$2") = (unsigned long) SYS_futex;
+  register unsigned long __a0 asm("$4") = (unsigned long) addr;
+  register unsigned long __a1 asm("$5") = (unsigned long) op;
+  register unsigned long __a2 asm("$6") = (unsigned long) val;
+  register unsigned long __a3 asm("$7") = 0;
+
+  __asm volatile ("syscall"
+                 /* returns $a3 (errno), $v0 (return value) */
+                 : "=r" (__v0), "=r" (__a3)
+                 /* arguments in v0 (syscall) a0-a3 */
+                 : "r" (__v0), "r" (__a0), "r" (__a1), "r" (__a2), "r" (__a3)
+                 /* clobbers at, v1, t0-t9, memory */
+                 : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13", "$14",
+                   "$15", "$24", "$25", "memory");
+}
+
+static inline void
+futex_wait (int *addr, int val)
+{
+  sys_futex0 (addr, FUTEX_WAIT, val);
+}
+
+static inline void
+futex_wake (int *addr, int count)
+{
+  sys_futex0 (addr, FUTEX_WAKE, count);
+}
+
+static inline void
+cpu_relax (void)
+{
+  __asm volatile ("" : : : "memory");
+}
+
+static inline void
+atomic_write_barrier (void)
+{
+  __sync_synchronize ();
+}