diff options
Diffstat (limited to 'ports/sysdeps/am33/fpu/fpu_control.h')
| -rw-r--r-- | ports/sysdeps/am33/fpu/fpu_control.h | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/ports/sysdeps/am33/fpu/fpu_control.h b/ports/sysdeps/am33/fpu/fpu_control.h new file mode 100644 index 0000000000..de28228e71 --- /dev/null +++ b/ports/sysdeps/am33/fpu/fpu_control.h @@ -0,0 +1,74 @@ +/* FPU control word bits. AM33/2.0 version. + Copyright (C) 1996, 1997, 1998, 1999, 2000, 2004 + Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Alexandre Oliva <aoliva@redhat.com> + based on the corresponding file in the mips port. + + 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, see + <http://www.gnu.org/licenses/>. */ + +#ifndef _FPU_CONTROL_H +#define _FPU_CONTROL_H + +/* AM33/2.0 FPU floating point control register bits. + * + * 31-22 -> reserved + * 21-18 -> floating-point condition codes (L, G, E, U) + * 17-16 -> rounding modes (00 is to-nearest; other values are reserved + * 15 -> reserved (read as 0, write with 0) + * 14-10 -> Exception Cause (inValid, divZero, Overflow, Underflow, Inexact) + * 9- 5 -> Exception Enable + * 4- 0 -> Exception Flag, cleared when exception cause is set + */ + +#include <features.h> +#include <fenv.h> + +/* masking of interrupts */ +#define _FPU_MASK_V 0x0200 /* Invalid operation */ +#define _FPU_MASK_Z 0x0100 /* Division by zero */ +#define _FPU_MASK_O 0x0080 /* Overflow */ +#define _FPU_MASK_U 0x0040 /* Underflow */ +#define _FPU_MASK_I 0x0020 /* Inexact operation */ + +/* rounding control */ +#define _FPU_RC_NEAREST 0x0 /* Only available mode */ + +#define _FPU_RESERVED 0xffc08000 /* Reserved bits in fpcr */ + + +/* The fdlibm code requires strict IEEE double precision arithmetic, + and no interrupts for exceptions, rounding to nearest. */ + +#define _FPU_DEFAULT 0x0000001f + +/* IEEE: same as above, but exceptions */ +#define _FPU_IEEE 0x000003ff + +/* Type of the control word. */ +typedef unsigned int fpu_control_t; + +/* Macros for accessing the hardware control word. _FPU_SETCW is + defined such that it won't modify the EF bits, that are cleared + when assigned bits that are set. Use SETFCW to get them actually + reset. */ +#define _FPU_SETFCW(cw) __asm__ ("fmov %0,fpcr" : : "ri" (cw)) +#define _FPU_SETCW(cw) _FPU_SETFCW((cw) & ~FE_ALL_EXCEPT) +#define _FPU_GETCW(cw) __asm__ ("fmov fpcr,%0" : "=r" (cw)) + +/* Default control word set at startup. */ +extern fpu_control_t __fpu_control; + +#endif /* fpu_control.h */ |