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      1 /*	$NetBSD: fenv.h,v 1.6 2021/10/06 05:33:15 skrll Exp $	*/
      2 
      3 /*
      4  * Based on ieeefp.h written by J.T. Conklin, Apr 28, 1995
      5  * Public domain.
      6  */
      7 
      8 #ifndef _ARM_FENV_H_
      9 #define _ARM_FENV_H_
     10 
     11 #include <sys/cdefs.h>
     12 
     13 #ifdef __ARM_PCS_AAPCS64
     14 /* AArch64 split FPSCR into two registers FPCR and FPSR */
     15 typedef struct {
     16 	unsigned int __fpcr;
     17 	unsigned int __fpsr;
     18 } fenv_t;
     19 #else
     20 typedef int fenv_t;		/* FPSCR */
     21 #endif
     22 typedef int fexcept_t;
     23 
     24 #define	FE_INVALID	0x01	/* invalid operation exception */
     25 #define	FE_DIVBYZERO	0x02	/* divide-by-zero exception */
     26 #define	FE_OVERFLOW	0x04	/* overflow exception */
     27 #define	FE_UNDERFLOW	0x08	/* underflow exception */
     28 #define	FE_INEXACT	0x10	/* imprecise (loss of precision; "inexact") */
     29 
     30 #define	FE_ALL_EXCEPT	0x1f
     31 
     32 #define	FE_TONEAREST	0	/* round to nearest representable number */
     33 #define	FE_UPWARD	1	/* round toward positive infinity */
     34 #define	FE_DOWNWARD	2	/* round toward negative infinity */
     35 #define	FE_TOWARDZERO	3	/* round to zero (truncate) */
     36 
     37 #ifdef __SOFTFP__
     38 
     39 /*
     40  * Provide a platform-specific softfloat ABI.
     41  */
     42 
     43 #include <arm/vfpreg.h>
     44 
     45 #define __FENV_GET_FLAGS(__envp)	__SHIFTOUT(*(__envp), VFP_FPSCR_CSUM)
     46 #define __FENV_GET_MASK(__envp)		__SHIFTOUT(*(__envp), VFP_FPSCR_ESUM)
     47 #define __FENV_GET_ROUND(__envp)	__SHIFTOUT(*(__envp), VFP_FPSCR_RMODE)
     48 #define __FENV_SET_FLAGS(__envp, __val) \
     49 	*(__envp) = __SHIFTIN((__val), VFP_FPSCR_CSUM)
     50 #define __FENV_SET_MASK(__envp, __val) \
     51 	*(__envp) = __SHIFTIN((__val), VFP_FPSCR_ESUM)
     52 #define __FENV_SET_ROUND(__envp, __val) \
     53 	*(__envp) = __SHIFTIN((__val), VFP_FPSCR_RMODE)
     54 
     55 #define __HAVE_FENV_SOFTFLOAT_DEFS
     56 
     57 #endif /* __SOFTFP__ */
     58 
     59 __BEGIN_DECLS
     60 
     61 /* Default floating-point environment */
     62 extern const fenv_t	__fe_dfl_env;
     63 #define FE_DFL_ENV	(&__fe_dfl_env)
     64 
     65 __END_DECLS
     66 
     67 #endif /* _ARM_FENV_H_ */
     68