diff options
Diffstat (limited to 'libc/sysdeps/linux/m68k/fpu_control.h')
| -rw-r--r-- | libc/sysdeps/linux/m68k/fpu_control.h | 77 |
1 files changed, 46 insertions, 31 deletions
diff --git a/libc/sysdeps/linux/m68k/fpu_control.h b/libc/sysdeps/linux/m68k/fpu_control.h index 35ad95e6d..c3a9c6326 100644 --- a/libc/sysdeps/linux/m68k/fpu_control.h +++ b/libc/sysdeps/linux/m68k/fpu_control.h @@ -1,6 +1,5 @@ /* 68k FPU control word definitions. - Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc. - This file is part of the GNU C Library. + Copyright (C) 1996-2025 Free Software Foundation, Inc. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public @@ -13,8 +12,8 @@ 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/>. */ + License along with the GNU C Library. If not, see + <https://www.gnu.org/licenses/>. */ #ifndef _FPU_CONTROL_H #define _FPU_CONTROL_H @@ -29,9 +28,9 @@ * 12 -> enable trap for OVFL exception * 11 -> enable trap for UNFL exception * 10 -> enable trap for DZ exception - * 9 -> enable trap for INEX2 exception - * 8 -> enable trap for INEX1 exception - * 7-6 -> Precision Control + * 9 -> enable trap for INEX2 exception (INEX on Coldfire) + * 8 -> enable trap for INEX1 exception (IDE on Coldfire) + * 7-6 -> Precision Control (only bit 6 is used on Coldfire) * 5-4 -> Rounding Control * 3-0 -> zero (read as 0, write as 0) * @@ -53,50 +52,66 @@ #include <features.h> +#if defined (__mcoldfire__) && !defined (__mcffpu__) + +# define _FPU_RESERVED 0xffffffff +# define _FPU_DEFAULT 0x00000000 +# define _FPU_GETCW(cw) ((cw) = 0) +# define _FPU_SETCW(cw) ((void) (cw)) + +#else + /* masking of interrupts */ -#define _FPU_MASK_BSUN 0x8000 -#define _FPU_MASK_SNAN 0x4000 -#define _FPU_MASK_OPERR 0x2000 -#define _FPU_MASK_OVFL 0x1000 -#define _FPU_MASK_UNFL 0x0800 -#define _FPU_MASK_DZ 0x0400 -#define _FPU_MASK_INEX1 0x0200 -#define _FPU_MASK_INEX2 0x0100 +# define _FPU_MASK_BSUN 0x8000 +# define _FPU_MASK_SNAN 0x4000 +# define _FPU_MASK_OPERR 0x2000 +# define _FPU_MASK_OVFL 0x1000 +# define _FPU_MASK_UNFL 0x0800 +# define _FPU_MASK_DZ 0x0400 +# define _FPU_MASK_INEX1 0x0200 +# define _FPU_MASK_INEX2 0x0100 /* precision control */ -#define _FPU_EXTENDED 0x00 /* RECOMMENDED */ -#define _FPU_DOUBLE 0x80 -#define _FPU_SINGLE 0x40 /* DO NOT USE */ +# ifdef __mcoldfire__ +# define _FPU_DOUBLE 0x00 +# else +# define _FPU_EXTENDED 0x00 /* RECOMMENDED */ +# define _FPU_DOUBLE 0x80 +# endif +# define _FPU_SINGLE 0x40 /* DO NOT USE */ /* rounding control */ -#define _FPU_RC_NEAREST 0x00 /* RECOMMENDED */ -#define _FPU_RC_ZERO 0x10 -#define _FPU_RC_DOWN 0x20 -#define _FPU_RC_UP 0x30 +# define _FPU_RC_NEAREST 0x00 /* RECOMMENDED */ +# define _FPU_RC_ZERO 0x10 +# define _FPU_RC_DOWN 0x20 +# define _FPU_RC_UP 0x30 -#define _FPU_RESERVED 0xFFFF000F /* Reserved bits in fpucr */ +# ifdef __mcoldfire__ +# define _FPU_RESERVED 0xFFFF800F +# else +# define _FPU_RESERVED 0xFFFF000F /* Reserved bits in fpucr */ +# endif /* Now two recommended fpucr */ /* The fdlibm code requires no interrupts for exceptions. Don't change the rounding mode, it would break long double I/O! */ -#define _FPU_DEFAULT 0x00000000 +# define _FPU_DEFAULT 0x00000000 /* IEEE: same as above, but exceptions. We must make it non-zero so that __setfpucw works. This bit will be ignored. */ -#define _FPU_IEEE 0x00000001 +# define _FPU_IEEE 0x00000001 + +/* Macros for accessing the hardware control word. */ +# define _FPU_GETCW(cw) __asm__ ("fmove%.l %!, %0" : "=dm" (cw)) +# define _FPU_SETCW(cw) __asm__ volatile ("fmove%.l %0, %!" : : "dm" (cw)) +#endif /* 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) __asm__ ("fmove%.l %!, %0" : "=dm" (cw)) -#define _FPU_SETCW(cw) __asm__ __volatile__ ("fmove%.l %0, %!" : : "dm" (cw)) - -#if 0 /* Default control word set at startup. */ extern fpu_control_t __fpu_control; -#endif #endif /* _M68K_FPU_CONTROL_H */ |