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Annotation of 43BSDReno/lib/libF77/traper_.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1980 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  *
        !             6:  *     @(#)traper_.c   5.3     11/3/86
        !             7:  *
        !             8:  * Full of Magic! DON'T CHANGE ANYTHING !!
        !             9:  *
        !            10:  * To use from f77:
        !            11:  *     integer oldmsk, traper
        !            12:  *     oldmsk = traper (mask)
        !            13:  * where for vax:
        !            14:  *     mask = 1 to trap integer overflow
        !            15:  *     mask = 2 to trap floating underflow
        !            16:  *     mask = 3 to trap both
        !            17:  *     These 2 bits will be set into the PSW.
        !            18:  *     The old state will be returned.
        !            19:  *
        !            20:  * where for CCI:
        !            21:  *     mask = 0 to trap neither
        !            22:  *     mask = 1 to trap integer overflow
        !            23:  *     mask = 2 to trap floating underflow
        !            24:  *     mask = 3 to trap both
        !            25:  *     These 2 bits will be set into the PSL.
        !            26:  *     The old state will be returned.
        !            27:  */
        !            28: 
        !            29: #ifdef vax
        !            30: long traper_(msk)
        !            31: long   *msk;
        !            32: {
        !            33:        int     old = 0;
        !            34: #define IOV_MASK       0140
        !            35:        int     **s = &msk;
        !            36:        int     psw;
        !            37: 
        !            38:        s -= 5;
        !            39:        psw = (int)*s;
        !            40:        old = (psw & IOV_MASK) >> 5;
        !            41:        psw = (psw & ~IOV_MASK) | ((*msk << 5) & IOV_MASK);
        !            42:        *s = (int *)psw;
        !            43:        return((long)old);
        !            44: }
        !            45: #endif vax
        !            46: 
        !            47: /*
        !            48:  * Assumptions for CCI:
        !            49:  *     - the two bits are contiguous in PSL;
        !            50:  *     - integer overflow trap enable bit < floating underflow trap enable bit;
        !            51:  */
        !            52: #ifdef tahoe
        !            53: # include <machine/psl.h>
        !            54: 
        !            55: unsigned long old_msk;
        !            56: unsigned short new_msk;
        !            57: unsigned long tst_msk;
        !            58: 
        !            59: long traper_(msk)
        !            60: long   *msk;
        !            61: {
        !            62: #define IOV_MASK (PSL_IV | PSL_FU)
        !            63: #define IOV_DISP 5
        !            64: 
        !            65:        asm("   movpsl _old_msk");
        !            66: 
        !            67:        old_msk = (old_msk & IOV_MASK) >> IOV_DISP;
        !            68: 
        !            69:        new_msk = (*msk << IOV_DISP) & IOV_MASK;
        !            70:        asm("   bispsw _new_msk");
        !            71: 
        !            72:        new_msk = ~(*msk << IOV_DISP) & IOV_MASK;
        !            73:        asm("   bicpsw _new_msk");
        !            74: 
        !            75:        return(old_msk);
        !            76: }
        !            77: #endif tahoe

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