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-rw-r--r--libc/sysdeps/linux/m68k/fpu_control.h69
1 files changed, 69 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/m68k/fpu_control.h b/libc/sysdeps/linux/m68k/fpu_control.h
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+/* FPU control word definitions. PowerPC version.
+ Copyright (C) 1996, 1997, 1998 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 _FPU_CONTROL_H
+#define _FPU_CONTROL_H
+
+/* rounding control */
+#define _FPU_RC_NEAREST 0x00 /* RECOMMENDED */
+#define _FPU_RC_DOWN 0x03
+#define _FPU_RC_UP 0x02
+#define _FPU_RC_ZERO 0x01
+
+#define _FPU_MASK_NI 0x04 /* non-ieee mode */
+
+/* masking of interrupts */
+#define _FPU_MASK_ZM 0x10 /* zero divide */
+#define _FPU_MASK_OM 0x40 /* overflow */
+#define _FPU_MASK_UM 0x20 /* underflow */
+#define _FPU_MASK_XM 0x08 /* inexact */
+#define _FPU_MASK_IM 0x80 /* invalid operation */
+
+#define _FPU_RESERVED 0xffffff00 /* These bits are reserved are not changed. */
+
+/* The fdlibm code requires no interrupts for exceptions. */
+#define _FPU_DEFAULT 0x00000000 /* Default value. */
+
+/* IEEE: same as above, but (some) exceptions;
+ we leave the 'inexact' exception off.
+ */
+#define _FPU_IEEE 0x000000f0
+
+/* Type of the control word. */
+typedef unsigned int fpu_control_t __attribute__ ((__mode__ (__SI__)));
+
+/* Macros for accessing the hardware control word. */
+#define _FPU_GETCW(__cw) ( { \
+ union { double d; fpu_control_t cw[2]; } \
+ tmp __attribute__ ((__aligned__(8))); \
+ __asm__ ("mffs 0; stfd%U0 0,%0" : "=m" (tmp.d) : : "fr0"); \
+ (__cw)=tmp.cw[1]; \
+ tmp.cw[1]; } )
+#define _FPU_SETCW(__cw) { \
+ union { double d; fpu_control_t cw[2]; } \
+ tmp __attribute__ ((__aligned__(8))); \
+ tmp.cw[0] = 0xFFF80000; /* More-or-less arbitrary; this is a QNaN. */ \
+ tmp.cw[1] = __cw; \
+ __asm__ ("lfd%U0 0,%0; mtfsf 255,0" : : "m" (tmp.d) : "fr0"); \
+}
+
+/* Default control word set at startup. */
+extern fpu_control_t __fpu_control;
+
+#endif /* _FPU_CONTROL_H */