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-rw-r--r--sysdeps/sparc/fpu_control.h86
1 files changed, 86 insertions, 0 deletions
diff --git a/sysdeps/sparc/fpu_control.h b/sysdeps/sparc/fpu_control.h
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+++ b/sysdeps/sparc/fpu_control.h
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+/* FPU control word bits. SPARC version.
+ Copyright (C) 1997 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Miguel de Icaza
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Library General Public License as
+ published by the Free Software Foundation; either version 2 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
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+#ifndef _FPU_CONTROL_H
+#define _FPU_CONTROL_H 1
+
+
+#include <features.h>
+
+/* precision control */
+#define _FPU_EXTENDED 0x00000000 /* RECOMMENDED */
+#define _FPU_DOUBLE 0x20000000
+#define _FPU_80BIT 0x30000000
+#define _FPU_SINGLE 0x10000000 /* DO NOT USE */
+
+/* rounding control / Sparc */
+#define _FPU_RC_NEAREST 0x0 /* RECOMMENDED */
+#define _FPU_RC_DOWN 0x80000000
+#define _FPU_RC_UP 0xc0000000
+#define _FPU_RC_ZERO 0x40000000
+
+#define _FPU_RESERVED 0x300000 /* Reserved bits in cw */
+
+
+/* Now two recommended cw */
+
+/* Linux default:
+ - extended precision
+ - rounding to nearest
+ - exceptions on overflow, zero divide and NaN */
+#define _FPU_DEFAULT 0x1f
+
+/* IEEE: same as above, but exceptions */
+#define _FPU_IEEE 0x0
+
+/* private namespace. It should only be used by crt0.o. */
+extern unsigned short __fpu_control;
+
+__BEGIN_DECLS
+
+/* called by crt0.o. It can be used to manipulate 387 control word. */
+extern void __setfpucw __P ((unsigned short));
+
+__END_DECLS
+
+/* Type of the control word. */
+typedef unsigned int fpu_control_t __attribute__ ((__mode__ (__HI__)));
+
+#define _FPU_GETCW(cw) __asm__ ("st %%fsr,%0" : "=m" (*&cw))
+#define _FPU_SETCW(cw) __asm__ ("ld %0,%%fsr" : "=m" (*&cw))
+
+#if 0
+/* The intel original macros */
+/* Macros for accessing the hardware control word. */
+#define _FPU_GETCW(cw) __asm__ ("fnstcw %0" : "=m" (*&cw))
+#define _FPU_SETCW(cw) __asm__ ("fldcw %0" : : "m" (*&cw))
+#endif
+
+/* Default control word set at startup. */
+extern fpu_control_t __fpu_control;
+
+__BEGIN_DECLS
+
+/* Called at startup. It can be used to manipulate fpu control register. */
+extern void __setfpucw __P ((fpu_control_t));
+
+__END_DECLS
+
+#endif /* fpu_control.h */