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73 lines
2.3 KiB
C
73 lines
2.3 KiB
C
/* FPU control word bits. SPARC version.
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Copyright (C) 1997-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Miguel de Icaza
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef _FPU_CONTROL_H
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#define _FPU_CONTROL_H 1
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#include <features.h>
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#include <bits/wordsize.h>
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/* masking of interrupts */
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#define _FPU_MASK_IM 0x08000000
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#define _FPU_MASK_OM 0x04000000
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#define _FPU_MASK_UM 0x02000000
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#define _FPU_MASK_ZM 0x01000000
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#define _FPU_MASK_PM 0x00800000
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/* precision control */
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#define _FPU_EXTENDED 0x00000000 /* RECOMMENDED */
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#define _FPU_DOUBLE 0x20000000
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#define _FPU_80BIT 0x30000000
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#define _FPU_SINGLE 0x10000000 /* DO NOT USE */
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/* rounding control / Sparc */
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#define _FPU_RC_DOWN 0xc0000000
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#define _FPU_RC_UP 0x80000000
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#define _FPU_RC_ZERO 0x40000000
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#define _FPU_RC_NEAREST 0x0 /* RECOMMENDED */
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#define _FPU_RESERVED 0x30300000 /* Reserved bits in cw */
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/* Now two recommended cw */
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/* Linux and IEEE default:
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- extended precision
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- rounding to nearest
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- no exceptions */
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#define _FPU_DEFAULT 0x0
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#define _FPU_IEEE 0x0
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/* Type of the control word. */
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typedef unsigned long int fpu_control_t;
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#if __WORDSIZE == 64
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# define _FPU_GETCW(cw) __asm__ __volatile__ ("stx %%fsr,%0" : "=m" (*&cw))
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# define _FPU_SETCW(cw) __asm__ __volatile__ ("ldx %0,%%fsr" : : "m" (*&cw))
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#else
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# define _FPU_GETCW(cw) __asm__ __volatile__ ("st %%fsr,%0" : "=m" (*&cw))
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# define _FPU_SETCW(cw) __asm__ __volatile__ ("ld %0,%%fsr" : : "m" (*&cw))
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#endif
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/* Default control word set at startup. */
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extern fpu_control_t __fpu_control;
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#endif /* fpu_control.h */
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