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Annotation of coherent/f/usr/include.78/ieeefp.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * /usr/include/ieeefp.h
        !             3:  *
        !             4:  * Describes the stack frame presented to a user signal handler,
        !             5:  * including (optional) floating point context.
        !             6:  *
        !             7:  * Revised Mon Mar 22 13:11:43 1993 CST
        !             8:  */
        !             9: 
        !            10: #ifndef __IEEEFP_H__
        !            11: #define __IEEEFP_H__
        !            12: 
        !            13: #include <sys/reg.h>
        !            14: /*
        !            15:  * "fpem" objects are for floating point emulation.
        !            16:  *
        !            17:  * The stackframe passed to a signal handler includes a pointer "fpsp".
        !            18:  * This pointer is a (struct _fpstate *) when a true coprocessor is in use.
        !            19:  * It is actually a (struct _fpemstate *), and must be cast thus, when
        !            20:  * the emulator is used.
        !            21:  * The declaration of "fpsp" is kept as (struct _fpstate *) for BCS
        !            22:  * compatibility.
        !            23:  */
        !            24: 
        !            25: struct _fpem_reg {
        !            26:        char sign;
        !            27:        char tag;
        !            28:        long exp;
        !            29:        unsigned sigl;
        !            30:        unsigned sigh;
        !            31: };
        !            32: 
        !            33: struct _fpstackframe {
        !            34:        long    signo;
        !            35:        long    regs[SS+1];
        !            36:        struct  _fpstate *fpsp;
        !            37:        char    *wsp;
        !            38: };
        !            39: 
        !            40: struct _fpreg {
        !            41:        unsigned short significand[4];
        !            42:        unsigned short exponent;
        !            43: };
        !            44: 
        !            45: struct _fpstate {
        !            46:        unsigned long   cw,
        !            47:                        sw,
        !            48:                        tag,
        !            49:                        ipoff,
        !            50:                        cssel,
        !            51:                        dataoff,
        !            52:                        datasel;
        !            53:        struct _fpreg   _st[8];
        !            54:        unsigned long   status;
        !            55: };
        !            56: 
        !            57: struct _fpemstate {
        !            58:        unsigned long   cw,
        !            59:                        sw,
        !            60:                        tag,
        !            61:                        ipoff,
        !            62:                        cssel,
        !            63:                        dataoff,
        !            64:                        datasel,
        !            65:                        top;
        !            66:        struct  _fpem_reg regs[8];      /* pseudo regs */
        !            67:        unsigned char lookahead;
        !            68:        unsigned long   status,
        !            69:                        entry_eip;
        !            70: };
        !            71: 
        !            72: /* For kernel context in u area, which keeps either emulator or ndp status. */
        !            73: union _fpcontext {
        !            74:        struct _fpstate         fpstate;
        !            75:        struct _fpemstate       fpemstate;
        !            76: };
        !            77: #endif

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