MIPS futex patch for OpenMP
Fu, Chao-Ying
fu@mips.com
Fri Jul 18 02:00:00 GMT 2008
Hi All,
Here is one patch from Ilie Garbacea to support MIPS futex for OpenMP.
I built GCC for the target of mips-linux-gnu and tested it on one MIPS
Linux malta board with MIPS 74k FPGA. Test results are ok.
Is the patch ok to check in? Thanks a lot!
Ex:
# runtest --tool "gcc" --src-dir "/home/fu/dev/gcc4x/gcc/gcc/testsuite" --target_board=mips-linux-gnu-malta gcc.dg/gomp/gomp.exp
=== gcc Summary ===
# of expected passes 429
# of expected failures 5
/home/fu/dev/gcc4x/install-mips-linux/bin/mips-linux-gnu-gcc version 4.4.0 2008
0717 (experimental) [trunk revision 131984] (GCC)
# runtest --tool "g++" --src-dir "/home/fu/dev/gcc4x/gcc/gcc/testsuite" --target_board=mips-linux-gnu-malta g++.dg/gomp/gomp.exp
=== g++ Summary ===
# of expected passes 397
# of expected failures 1
/home/fu/dev/gcc4x/install-mips-linux/bin/mips-linux-gnu-g++ version 4.4.0 2008
0717 (experimental) [trunk revision 131984] (GCC)
Regards,
Chao-ying
2008-07-17 Ilie Garbacea <ilie@mips.com>
Chao-ying Fu <fu@mips.com>
* configure.tgt: Enable futex for MIPS.
* config/linux/mips/futex.h: New file.
Index: configure.tgt
===================================================================
--- configure.tgt (revision 137930)
+++ configure.tgt (working copy)
@@ -35,6 +35,10 @@
config_path="linux/ia64 linux posix"
;;
+ mips*-*-linux*)
+ config_path="linux/mips linux posix"
+ ;;
+
powerpc*-*-linux*)
config_path="linux/powerpc linux posix"
;;
Index: config/linux/mips/futex.h
===================================================================
--- config/linux/mips/futex.h (revision 0)
+++ config/linux/mips/futex.h (revision 0)
@@ -0,0 +1,75 @@
+/* Copyright (C) 2005, 2008 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 Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, 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 Lesser General Public License for
+ more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with libgomp; see the file COPYING.LIB. If not, write to the
+ Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ MA 02110-1301, USA. */
+
+/* As a special exception, if you link this library with other files, some
+ of which are compiled with GCC, to produce an executable, this library
+ does not by itself cause the resulting executable to be covered by the
+ GNU General Public License. This exception does not however invalidate
+ any other reasons why the executable file might be covered by the GNU
+ General Public License. */
+
+/* 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 t0-t8 */
+ : "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15",
+ "$24", "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 ();
+}
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