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-rw-r--r--libgomp/config/linux/x86/futex.h153
1 files changed, 153 insertions, 0 deletions
diff --git a/libgomp/config/linux/x86/futex.h b/libgomp/config/linux/x86/futex.h
new file mode 100644
index 000000000..cb7461d89
--- /dev/null
+++ b/libgomp/config/linux/x86/futex.h
@@ -0,0 +1,153 @@
+/* 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. */
+
+#ifdef __LP64__
+# ifndef SYS_futex
+# define SYS_futex 202
+# endif
+
+static inline void
+futex_wait (int *addr, int val)
+{
+ register long r10 __asm__("%r10");
+ long res;
+
+ r10 = 0;
+ __asm volatile ("syscall"
+ : "=a" (res)
+ : "0" (SYS_futex), "D" (addr), "S" (gomp_futex_wait),
+ "d" (val), "r" (r10)
+ : "r11", "rcx", "memory");
+ if (__builtin_expect (res == -ENOSYS, 0))
+ {
+ gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG;
+ gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG;
+ r10 = 0;
+ __asm volatile ("syscall"
+ : "=a" (res)
+ : "0" (SYS_futex), "D" (addr), "S" (gomp_futex_wait),
+ "d" (val), "r" (r10)
+ : "r11", "rcx", "memory");
+ }
+}
+
+static inline void
+futex_wake (int *addr, int count)
+{
+ long res;
+
+ __asm volatile ("syscall"
+ : "=a" (res)
+ : "0" (SYS_futex), "D" (addr), "S" (gomp_futex_wake),
+ "d" (count)
+ : "r11", "rcx", "memory");
+ if (__builtin_expect (res == -ENOSYS, 0))
+ {
+ gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG;
+ gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG;
+ __asm volatile ("syscall"
+ : "=a" (res)
+ : "0" (SYS_futex), "D" (addr), "S" (gomp_futex_wake),
+ "d" (count)
+ : "r11", "rcx", "memory");
+ }
+}
+#else
+# ifndef SYS_futex
+# define SYS_futex 240
+# endif
+
+# ifdef __PIC__
+
+static inline long
+sys_futex0 (int *addr, int op, int val)
+{
+ long res;
+
+ __asm volatile ("xchgl\t%%ebx, %2\n\t"
+ "int\t$0x80\n\t"
+ "xchgl\t%%ebx, %2"
+ : "=a" (res)
+ : "0"(SYS_futex), "r" (addr), "c"(op),
+ "d"(val), "S"(0)
+ : "memory");
+ return res;
+}
+
+# else
+
+static inline long
+sys_futex0 (int *addr, int op, int val)
+{
+ long res;
+
+ __asm volatile ("int $0x80"
+ : "=a" (res)
+ : "0"(SYS_futex), "b" (addr), "c"(op),
+ "d"(val), "S"(0)
+ : "memory");
+ return res;
+}
+
+# endif /* __PIC__ */
+
+static inline void
+futex_wait (int *addr, int val)
+{
+ long res = sys_futex0 (addr, gomp_futex_wait, val);
+ if (__builtin_expect (res == -ENOSYS, 0))
+ {
+ gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG;
+ gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG;
+ sys_futex0 (addr, gomp_futex_wait, val);
+ }
+}
+
+static inline void
+futex_wake (int *addr, int count)
+{
+ long res = sys_futex0 (addr, gomp_futex_wake, count);
+ if (__builtin_expect (res == -ENOSYS, 0))
+ {
+ gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG;
+ gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG;
+ sys_futex0 (addr, gomp_futex_wake, count);
+ }
+}
+
+#endif /* __LP64__ */
+
+static inline void
+cpu_relax (void)
+{
+ __asm volatile ("rep; nop" : : : "memory");
+}
+
+static inline void
+atomic_write_barrier (void)
+{
+ __sync_synchronize ();
+}