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Annotation of 42BSD/games/compat/dosig.c, revision 1.1

1.1     ! root        1: static char sccsid[] = "@(#)dosig.c    4.2  83/07/31";
        !             2: 
        !             3: /*
        !             4:  * Handle signal trapping from version 6 or
        !             5:  * version 7 compatability mode programs.
        !             6:  *     Art Wetzel      November 1979
        !             7:  */
        !             8: 
        !             9: #ifdef TRACE
        !            10: #include <stdio.h>
        !            11: #endif
        !            12: #include <signal.h>
        !            13: #include "defs.h"
        !            14: 
        !            15: unsigned int  sigvals[NSIG+1];
        !            16: 
        !            17: /* actual catch point for all signals */
        !            18: sigcatch(signum, faultcode, scp)
        !            19:        int signum, faultcode;
        !            20:        struct sigcontext *scp;
        !            21: {
        !            22:        unsigned short *pcptr;
        !            23:        extern getregs();
        !            24:        if(incompat) {
        !            25:                /* hurry up and get the registers before they are destroyed */
        !            26:                getregs();
        !            27:        } else {
        !            28:                /* we were in native mode simulating a sys call */
        !            29:                /* set it up with the old values */
        !            30:                dosig(signum, pc);
        !            31:                /* go back where we were doing the sys call */
        !            32:                return(0);
        !            33:        }
        !            34:        /* figure out the pc */
        !            35:        pcptr = (unsigned short *) &scp->sc_pc;
        !            36:        pc = (unsigned short *) *pcptr;
        !            37:        /* get the psl with condition codes */
        !            38:        psl = 0x83c00000 | (scp->sc_ps & 017);
        !            39:        /* actually do the thing */
        !            40:        if (sigvals[signum] != (unsigned int)SIG_DFL &&
        !            41:            (sigvals[signum] & (unsigned int)SIG_IGN) == 0)
        !            42:                dosig(signum, pc);
        !            43:        /* go back to compatability mode and the signal routine there */
        !            44:        sigsetmask(scp->sc_mask);
        !            45:        incompat++;
        !            46:        compat();
        !            47: }
        !            48: 
        !            49: /* routine to set up pdp11 space for return from a signal */
        !            50: dosig(signum, from)
        !            51:        int signum, from;
        !            52: {
        !            53:        unsigned short *sp;
        !            54: 
        !            55: #ifdef TRACE
        !            56:        fprintf(stderr,"Caught sig %d from 0%o -> 0%o\n",signum,(pc-1),*(pc-1));
        !            57: #endif
        !            58:        /* where is the stack */
        !            59:        sp = (unsigned short *)regs[6];
        !            60:        /* stack up psw condition codes so rti works */
        !            61:        *(--sp) = psl & 017;
        !            62:        /* stack pc */
        !            63:        *(--sp) = (unsigned short)(int)pc;
        !            64:        /* reset stack pointer */
        !            65:        regs[6] = (unsigned short)(int)sp;
        !            66:        /* reset pc to signal catching routine */
        !            67:        pc = (unsigned short *)sigvals[signum];
        !            68:        signal(signum, SIG_DFL);
        !            69: }

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