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, 118 insertions, 0 deletions

diff --git a/REORG.TODO/sysdeps/m68k/fpu_control.h b/REORG.TODO/sysdeps/m68k/fpu_control.h
new file mode 100644
index 0000000000..0cef963670
--- /dev/null
+++ b/REORG.TODO/sysdeps/m68k/fpu_control.h
@@ -0,0 +1,118 @@
+/* 68k FPU control word definitions.
+   Copyright (C) 1996-2017 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 _FPU_CONTROL_H
+#define _FPU_CONTROL_H
+
+/*
+ * Motorola floating point control register bits.
+ *
+ * 31-16  -> reserved (read as 0, ignored on write)
+ * 15     -> enable trap for BSUN exception
+ * 14     -> enable trap for SNAN exception
+ * 13     -> enable trap for OPERR exception
+ * 12     -> enable trap for OVFL exception
+ * 11     -> enable trap for UNFL exception
+ * 10     -> enable trap for DZ exception
+ *  9     -> enable trap for INEX2 exception (INEX on Coldfire)
+ *  8     -> enable trap for INEX1 exception (IDE on Coldfire)
+ *  7-6   -> Precision Control (only bit 6 is used on Coldfire)
+ *  5-4   -> Rounding Control
+ *  3-0   -> zero (read as 0, write as 0)
+ *
+ *
+ * Precision Control:
+ * 00 - round to extended precision
+ * 01 - round to single precision
+ * 10 - round to double precision
+ * 11 - undefined
+ *
+ * Rounding Control:
+ * 00 - rounding to nearest (RN)
+ * 01 - rounding toward zero (RZ)
+ * 10 - rounding (down)toward minus infinity (RM)
+ * 11 - rounding (up) toward plus infinity (RP)
+ *
+ * The hardware default is 0x0000. I choose 0x5400.
+ */
+
+#include <features.h>
+
+#if defined (__mcoldfire__) && !defined (__mcffpu__)
+
+# define _FPU_RESERVED 0xffffffff
+# define _FPU_DEFAULT  0x00000000
+# define _FPU_GETCW(cw) ((cw) = 0)
+# define _FPU_SETCW(cw) ((void) (cw))
+
+#else
+
+/* masking of interrupts */
+# define _FPU_MASK_BSUN  0x8000
+# define _FPU_MASK_SNAN  0x4000
+# define _FPU_MASK_OPERR 0x2000
+# define _FPU_MASK_OVFL  0x1000
+# define _FPU_MASK_UNFL  0x0800
+# define _FPU_MASK_DZ    0x0400
+# define _FPU_MASK_INEX1 0x0200
+# define _FPU_MASK_INEX2 0x0100
+
+/* precision control */
+# ifdef __mcoldfire__
+#  define _FPU_DOUBLE   0x00
+# else
+#  define _FPU_EXTENDED 0x00   /* RECOMMENDED */
+#  define _FPU_DOUBLE   0x80
+# endif
+# define _FPU_SINGLE   0x40     /* DO NOT USE */
+
+/* rounding control */
+# define _FPU_RC_NEAREST 0x00    /* RECOMMENDED */
+# define _FPU_RC_ZERO    0x10
+# define _FPU_RC_DOWN    0x20
+# define _FPU_RC_UP      0x30
+
+# ifdef __mcoldfire__
+#  define _FPU_RESERVED 0xFFFF800F
+# else
+#  define _FPU_RESERVED 0xFFFF000F  /* Reserved bits in fpucr */
+# endif
+
+
+/* Now two recommended fpucr */
+
+/* The fdlibm code requires no interrupts for exceptions.  Don't
+   change the rounding mode, it would break long double I/O!  */
+# define _FPU_DEFAULT  0x00000000
+
+/* IEEE:  same as above, but exceptions.  We must make it non-zero so
+   that __setfpucw works.  This bit will be ignored.  */
+# define _FPU_IEEE     0x00000001
+
+/* Macros for accessing the hardware control word.  */
+# define _FPU_GETCW(cw) __asm__ ("fmove%.l %!, %0" : "=dm" (cw))
+# define _FPU_SETCW(cw) __asm__ volatile ("fmove%.l %0, %!" : : "dm" (cw))
+#endif
+
+/* Type of the control word.  */
+typedef unsigned int fpu_control_t __attribute__ ((__mode__ (__SI__)));
+
+/* Default control word set at startup.  */
+extern fpu_control_t __fpu_control;
+
+#endif /* _M68K_FPU_CONTROL_H */