summaryrefslogtreecommitdiff
path: root/libc/sysdeps/linux/sparc/fpu_control.h
diff options
context:
space:
mode:
Diffstat (limited to 'libc/sysdeps/linux/sparc/fpu_control.h')
-rw-r--r--libc/sysdeps/linux/sparc/fpu_control.h73
1 files changed, 73 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/sparc/fpu_control.h b/libc/sysdeps/linux/sparc/fpu_control.h
new file mode 100644
index 000000000..b29734ce2
--- /dev/null
+++ b/libc/sysdeps/linux/sparc/fpu_control.h
@@ -0,0 +1,73 @@
+/* FPU control word bits. SPARC version.
+ Copyright (C) 1997, 1998, 1999 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 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 _FPU_CONTROL_H
+#define _FPU_CONTROL_H 1
+
+
+#include <features.h>
+#include <bits/wordsize.h>
+
+/* masking of interrupts */
+#define _FPU_MASK_IM 0x08000000
+#define _FPU_MASK_OM 0x04000000
+#define _FPU_MASK_UM 0x02000000
+#define _FPU_MASK_ZM 0x01000000
+#define _FPU_MASK_PM 0x00800000
+
+/* 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_DOWN 0xc0000000
+#define _FPU_RC_UP 0x80000000
+#define _FPU_RC_ZERO 0x40000000
+#define _FPU_RC_NEAREST 0x0 /* RECOMMENDED */
+
+#define _FPU_RESERVED 0x30300000 /* Reserved bits in cw */
+
+
+/* Now two recommended cw */
+
+/* Linux and IEEE default:
+ - extended precision
+ - rounding to nearest
+ - no exceptions */
+#define _FPU_DEFAULT 0x0
+#define _FPU_IEEE 0x0
+
+/* Type of the control word. */
+typedef unsigned long int fpu_control_t;
+
+#if __WORDSIZE == 64
+# define _FPU_GETCW(cw) __asm__ ("stx %%fsr,%0" : "=m" (*&cw))
+# define _FPU_SETCW(cw) __asm__ ("ldx %0,%%fsr" : : "m" (*&cw))
+#else
+# define _FPU_GETCW(cw) __asm__ ("st %%fsr,%0" : "=m" (*&cw))
+# define _FPU_SETCW(cw) __asm__ ("ld %0,%%fsr" : : "m" (*&cw))
+#endif
+
+/* Default control word set at startup. */
+extern fpu_control_t __fpu_control;
+
+#endif /* fpu_control.h */