diff options
Diffstat (limited to 'libc/sysdeps/linux/sparc/fpu_control.h')
-rw-r--r-- | libc/sysdeps/linux/sparc/fpu_control.h | 73 |
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 */ |