1 /* FPU control word definitions. SH version.
2 Copyright (C) 1999, 2000, 2009 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
20 #ifndef _FPU_CONTROL_H
21 #define _FPU_CONTROL_H
23 #warning This file is only correct for sh4
25 /* masking of interrupts */
26 #define _FPU_MASK_VM 0x0800 /* Invalid operation */
27 #define _FPU_MASK_ZM 0x0400 /* Division by zero */
28 #define _FPU_MASK_OM 0x0200 /* Overflow */
29 #define _FPU_MASK_UM 0x0100 /* Underflow */
30 #define _FPU_MASK_IM 0x0080 /* Inexact operation */
32 /* rounding control */
33 #define _FPU_RC_NEAREST 0x0 /* RECOMMENDED */
34 #define _FPU_RC_ZERO 0x1
36 #define _FPU_RESERVED 0xffc00000 /* These bits are reserved. */
38 /* The fdlibm code requires strict IEEE double precision arithmetic,
39 and no interrupts for exceptions, rounding to nearest. */
40 #define _FPU_DEFAULT 0x00080000 /* Default value. */
41 #define _FPU_IEEE 0x00080f80 /* Default + exceptions enabled. */
43 /* Type of the control word. */
44 typedef unsigned int fpu_control_t;
46 /* Macros for accessing the hardware control word. */
47 #define _FPU_GETCW(cw) __asm__ ("sts fpscr,%0" : "=r" (cw))
50 /* GCC provides this function */
51 extern void __set_fpscr (unsigned long);
52 #define _FPU_SETCW(cw) __set_fpscr ((cw))
54 #define _FPU_SETCW(cw) __asm__ ("lds %0,fpscr" : : "r" (cw))
58 /* Default control word set at startup. */
59 extern fpu_control_t __fpu_control;
62 #endif /* _FPU_CONTROL_H */