1 files changed, 92 insertions, 0 deletions
diff --git a/sysdeps/mach/mips/machine-lock.h b/sysdeps/mach/mips/machine-lock.h
new file mode 100644
index 0000000000..eccc720dfa
--- /dev/null
+++ b/sysdeps/mach/mips/machine-lock.h
@@ -0,0 +1,92 @@
+/* Machine-specific definition for spin locks.  MIPS version.
+   Copyright (C) 1996, 1997 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library 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.
+
+   The GNU C Library 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 the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#ifndef _MACHINE_LOCK_H
+#define	_MACHINE_LOCK_H
+
+/* To get the TAS pseudo-instruction. */
+#include <mach/mips/mips_instruction.h>
+
+/* The type of a spin lock variable.  */
+
+typedef __volatile int __spin_lock_t;
+
+/* Value to initialize `__spin_lock_t' variables to.  */
+
+#define	__SPIN_LOCK_INITIALIZER	0
+
+
+#ifndef _EXTERN_INLINE
+#define _EXTERN_INLINE extern __inline
+#endif
+
+/* Unlock LOCK.  */
+
+_EXTERN_INLINE void
+__spin_unlock (__spin_lock_t *__lock)
+{
+  *__lock = 0;
+}
+
+/* Try to lock LOCK; return nonzero if we locked it, zero if another has.  */
+
+_EXTERN_INLINE int
+__spin_try_lock (register __spin_lock_t *__lock)
+{
+#if (__mips >= 2)
+  int __rtn;
+
+  __asm__ __volatile (".set noreorder");
+#if (__mips64)
+  __asm__ __volatile ("lld %0,0(%1)" : "=r" (__rtn) : "r" (__lock));
+#else
+  __asm__ __volatile ("ll %0,0(%1)" : "=r" (__rtn) : "r" (__lock));
+#endif
+  if (__rtn)
+    return 0;
+  __asm__ __volatile ("move %0,%1" : "=r" (__rtn) : "r" (__lock));
+#if (__mips64)
+  __asm__ __volatile ("scd %0,0(%1)" : "=r" (__rtn) : "r" (__lock));
+#else
+  __asm__ __volatile ("sc %0,0(%1)" : "=r" (__rtn) : "r" (__lock));
+#endif
+  __asm__ __volatile (".set reorder");
+  return __rtn;
+#else
+  register int __rtn __asm__ ("a0");
+
+  /* Use the Mach microkernel's emulated TAS pseudo-instruction.  */
+  __asm__ __volatile (".set noreorder");
+  __asm__ __volatile (".word %1" : "=r" (__rtn) : "i" (op_tas), "0" (__lock));
+  __asm__ __volatile ("nop");
+  __asm__ __volatile (".set reorder");
+  return __rtn ^ (int) __lock;
+#endif
+}
+
+/* Return nonzero if LOCK is locked.  */
+
+_EXTERN_INLINE int
+__spin_lock_locked (__spin_lock_t *__lock)
+{
+  return *__lock != 0;
+}
+
+
+#endif /* machine-lock.h */