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Annotation of lucent/sys/src/ape/lib/ap/68020/f002677, revision 1.1

1.1     ! root        1: #include "../plan9/lib.h"
        !             2: #include "../plan9/sys9.h"
        !             3: #include <signal.h>
        !             4: 
        !             5: /* A stack to hold pcs when signals nest */
        !             6: #define MAXSIGSTACK 20
        !             7: typedef struct Pcstack Pcstack;
        !             8: static struct Pcstack {
        !             9:        int sig;
        !            10:        void (*hdlr)(int, char*, Ureg*);
        !            11:        unsigned long restorepc;
        !            12: } pcstack[MAXSIGSTACK];
        !            13: static int nstack = 0;
        !            14: 
        !            15: static void notecont(Ureg*, char*);
        !            16: 
        !            17: void
        !            18: _notetramp(int sig, void (*hdlr)(int, char*, Ureg*), Ureg *u)
        !            19: {
        !            20:        Pcstack *p;
        !            21: 
        !            22:        if(nstack >= MAXSIGSTACK)
        !            23:                _NOTED(1);      /* nesting too deep; just do system default */
        !            24:        p = &pcstack[nstack];
        !            25:        p->restorepc = u->pc;
        !            26:        p->sig = sig;
        !            27:        p->hdlr = hdlr;
        !            28:        nstack++;
        !            29:        u->pc = (unsigned long) notecont;
        !            30:        _NOTED(2);      /* NSAVE: clear note but hold state */
        !            31: }
        !            32: 
        !            33: static void
        !            34: notecont(Ureg *u, char *s)
        !            35: {
        !            36:        Pcstack *p;
        !            37:        void(*f)(int, char*, Ureg*);
        !            38: 
        !            39:        p = &pcstack[nstack-1];
        !            40:        f = p->hdlr;
        !            41:        u->pc = p->restorepc;
        !            42:        nstack--;
        !            43:        (*f)(p->sig, s, u);
        !            44:        _NOTED(3);      /* NRSTR */
        !            45: }

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