Return to ieeefp.h CVS log

Up to [MW Coherent from dump] / coherent / f / usr / include

Annotation of coherent/f/usr/include/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: /*
        !            14:  * The following magic numbers index the "reg" part of a saved signal context.
        !            15:  * These numbers *must* correspond to the structure offsets in the
        !            16:  * <common/_gregset.h> header for this to work.
        !            17:  */
        !            18: 
        !            19: #define        SS      18
        !            20: #define        UESP    17
        !            21: #define        EFL     16
        !            22: #define        CS      15
        !            23: #define        EIP     14
        !            24: #define        ERR     13
        !            25: #define TRAPNO 12
        !            26: #define        EAX     11
        !            27: #define        ECX     10
        !            28: #define        EDX     9
        !            29: #define        EBX     8
        !            30: #define        ESP     7
        !            31: #define        EBP     6
        !            32: #define        ESI     5
        !            33: #define        EDI     4
        !            34: #define        DS      3
        !            35: #define        ES      2
        !            36: #define        FS      1
        !            37: #define        GS      0
        !            38: 
        !            39: 
        !            40: /*
        !            41:  * "fpem" objects are for floating point emulation.
        !            42:  *
        !            43:  * The stackframe passed to a signal handler includes a pointer "fpsp".
        !            44:  * This pointer is a (struct _fpstate *) when a true coprocessor is in use.
        !            45:  * It is actually a (struct _fpemstate *), and must be cast thus, when
        !            46:  * the emulator is used.
        !            47:  * The declaration of "fpsp" is kept as (struct _fpstate *) for BCS
        !            48:  * compatibility.
        !            49:  */
        !            50: 
        !            51: struct _fpem_reg {
        !            52:        char sign;
        !            53:        char tag;
        !            54:        long exp;
        !            55:        unsigned sigl;
        !            56:        unsigned sigh;
        !            57: };
        !            58: 
        !            59: struct _fpstackframe {
        !            60:        long    signo;
        !            61:        long    regs[SS+1];
        !            62:        struct  _fpstate *fpsp;
        !            63:        char    *wsp;
        !            64: };
        !            65: 
        !            66: struct _fpreg {
        !            67:        unsigned short significand[4];
        !            68:        unsigned short exponent;
        !            69: };
        !            70: 
        !            71: struct _fpstate {
        !            72:        unsigned long   cw,
        !            73:                        sw,
        !            74:                        tag,
        !            75:                        ipoff,
        !            76:                        cssel,
        !            77:                        dataoff,
        !            78:                        datasel;
        !            79:        struct _fpreg   _st[8];
        !            80:        unsigned long   status;
        !            81: };
        !            82: 
        !            83: struct _fpemstate {
        !            84:        unsigned long   cw,
        !            85:                        sw,
        !            86:                        tag,
        !            87:                        ipoff,
        !            88:                        cssel,
        !            89:                        dataoff,
        !            90:                        datasel,
        !            91:                        top;
        !            92:        struct  _fpem_reg regs[8];      /* pseudo regs */
        !            93:        unsigned char lookahead;
        !            94:        unsigned long   status,
        !            95:                        entry_eip;
        !            96: };
        !            97: 
        !            98: /* For kernel context in u area, which keeps either emulator or ndp status. */
        !            99: union _fpcontext {
        !           100:        struct _fpstate         fpstate;
        !           101:        struct _fpemstate       fpemstate;
        !           102: };
        !           103: 
        !           104: #endif

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.