Prepare for radical source tree reorganization.zack/build-layout-experiment

All top-level files and directories are moved into a temporary storage
directory, REORG.TODO, except for files that will certainly still
exist in their current form at top level when we're done (COPYING,
COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which
are moved to the new directory OldChangeLogs, instead), and the
generated file INSTALL (which is just deleted; in the new order, there
will be no generated files checked into version control).

1 files changed, 95 insertions, 0 deletions

diff --git a/REORG.TODO/sysdeps/unix/sysv/linux/nios2/atomic-machine.h b/REORG.TODO/sysdeps/unix/sysv/linux/nios2/atomic-machine.h
new file mode 100644
index 0000000000..d4dd025603
--- /dev/null
+++ b/REORG.TODO/sysdeps/unix/sysv/linux/nios2/atomic-machine.h
@@ -0,0 +1,95 @@
+/* Low-level functions for atomic operations. Nios II version.
+   Copyright (C) 2012-2017 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, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _NIOS2_ATOMIC_MACHINE_H
+#define _NIOS2_ATOMIC_MACHINE_H 1
+
+#include <stdint.h>
+
+typedef int32_t atomic32_t;
+typedef uint32_t uatomic32_t;
+typedef int_fast32_t atomic_fast32_t;
+typedef uint_fast32_t uatomic_fast32_t;
+
+typedef intptr_t atomicptr_t;
+typedef uintptr_t uatomicptr_t;
+typedef intmax_t atomic_max_t;
+typedef uintmax_t uatomic_max_t;
+
+#define __HAVE_64B_ATOMICS 0
+#define USE_ATOMIC_COMPILER_BUILTINS 0
+
+/* XXX Is this actually correct?  */
+#define ATOMIC_EXCHANGE_USES_CAS 1
+
+#define __arch_compare_and_exchange_val_8_acq(mem, newval, oldval)	\
+  (abort (), (__typeof (*mem)) 0)
+#define __arch_compare_and_exchange_val_16_acq(mem, newval, oldval)	\
+  (abort (), (__typeof (*mem)) 0)
+#define __arch_compare_and_exchange_val_64_acq(mem, newval, oldval)	\
+  (abort (), (__typeof (*mem)) 0)
+
+#define __arch_compare_and_exchange_bool_8_acq(mem, newval, oldval)	\
+  (abort (), 0)
+#define __arch_compare_and_exchange_bool_16_acq(mem, newval, oldval)	\
+  (abort (), 0)
+#define __arch_compare_and_exchange_bool_64_acq(mem, newval, oldval)	\
+  (abort (), 0)
+
+#define __arch_compare_and_exchange_val_32_acq(mem, newval, oldval)	\
+  ({									\
+     register int r2 asm ("r2");					\
+     register int* r4 asm ("r4") = (int*)(mem);				\
+     register int r5 asm ("r5");					\
+     register int r6 asm ("r6") = (int)(newval);			\
+     int retval, orig_oldval = (int)(oldval);				\
+     long kernel_cmpxchg = 0x1004;					\
+     while (1)								\
+       {								\
+         r5 = *r4;							\
+	 if (r5 != orig_oldval)						\
+	   {								\
+	     retval = r5;						\
+	     break;							\
+	   }								\
+	 asm volatile ("callr %1\n"					\
+		       : "=r" (r2)					\
+		       : "r" (kernel_cmpxchg), "r" (r4), "r" (r5), "r" (r6) \
+		       : "ra", "memory");				\
+	 if (!r2) { retval = orig_oldval; break; }			\
+       }								\
+     (__typeof (*(mem))) retval;					\
+  })
+
+#define __arch_compare_and_exchange_bool_32_acq(mem, newval, oldval)	\
+  ({									\
+     register int r2 asm ("r2");					\
+     register int *r4 asm ("r4") = (int*)(mem);				\
+     register int r5 asm ("r5") = (int)(oldval);			\
+     register int r6 asm ("r6") = (int)(newval);			\
+     long kernel_cmpxchg = 0x1004;					\
+     asm volatile ("callr %1\n"						\
+		   : "=r" (r2)						\
+		   : "r" (kernel_cmpxchg), "r" (r4), "r" (r5), "r" (r6) \
+		   : "ra", "memory");					\
+     r2;								\
+  })
+
+#define atomic_full_barrier()  ({ asm volatile ("sync"); })
+
+#endif /* _NIOS2_ATOMIC_MACHINE_H */