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Annotation of cci/usr/src/usr.lib/libF77/traper_.c, revision 1.1

1.1     ! root        1: /*
        !             2:  *
        !             3:  *     @(#)traper_.s   8/27/85
        !             4:  *
        !             5:  *
        !             6:  * To use from f77:
        !             7:  *     integer oldmsk, traper
        !             8:  *     oldmsk = traper (mask)
        !             9:  * where:
        !            10:  *     mask = 0 to trap neither
        !            11:  *     mask = 1 to trap integer overflow
        !            12:  *     mask = 2 to trap floating underflow
        !            13:  *     mask = 3 to trap both
        !            14:  *     These 2 bits will be set into the PSL.
        !            15:  *     The old state will be returned.
        !            16:  * Assumptions:
        !            17:  *     - the two bits are contiguous in PSL;
        !            18:  *     - integer overflow trap enable bit < floating underflow trap enable bit;
        !            19:  */
        !            20: 
        !            21: # include <machine/psl.h>
        !            22: 
        !            23: unsigned long old_msk;
        !            24: unsigned short new_msk;
        !            25: unsigned long tst_msk;
        !            26: 
        !            27: long traper_(msk)
        !            28: long   *msk;
        !            29: {
        !            30: #define IOV_MASK (PSL_IV | PSL_FU)
        !            31: #define IOV_DISP 5
        !            32: 
        !            33:        asm("   movpsl _old_msk");
        !            34: 
        !            35:        old_msk = (old_msk & IOV_MASK) >> IOV_DISP;
        !            36: 
        !            37:        new_msk = (*msk << IOV_DISP) & IOV_MASK;
        !            38:        asm("   bispsw _new_msk");
        !            39: 
        !            40:        new_msk = ~(*msk << IOV_DISP) & IOV_MASK;
        !            41:        asm("   bicpsw _new_msk");
        !            42: 
        !            43:        return(old_msk);
        !            44: }

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