/* except.c:    This code handles exceptions that are caught by the exception vectors    that have been installed by the monitor through vinit().    General notice:    This code is part of a boot-monitor package developed as a generic base    platform for embedded system designs.  As such, it is likely to be    distributed to various projects beyond the control of the original    author.  Please notify the author of any enhancements made or bugs found    so that all may benefit from the changes.  In addition, notification back    to the author will allow the new user to pick up changes that may have    been made by other users after this version of the code was distributed.    Author: Ed Sutter    email:  esutter@lucent.com      (home: lesutter@worldnet.att.net)    phone:  908-582-2351            (home: 908-889-5161)*/#include "config.h"#include "cpu.h"#include "cpuio.h"#include "genlib.h"#include "stddefs.h"#include "monapp.h"ulong   ExceptionAddr;int     ExceptionType;extern  int getreg(), putreg();extern  void putsr(ushort);voidexception(void){    ulong   vnum, pc;    putsr(0x2700);    getreg("D0",&vnum);    vnum &= 0xff;    getreg("PC",&pc);    ExceptionAddr = pc;    ExceptionType = vnum;    monrestart(EXCEPTION);}voidvinit(){    extern void vbase(), vnext();    extern ulong resetPC, resetSP;    ulong   *vtab;    ulong   vfunc;    int i, delta;    /* Vector table is first 0x400 bytes of RAM starting at zero... */    vtab = (ulong *)0;    /* Special case for vtab[0] and vtab[1]: */    vtab[0] = resetSP;    vtab[1] = resetPC;    vfunc = (ulong)vbase;    delta = (ulong)vnext - (ulong)vbase;    for(i=2;i<256;i++) {        vtab[i] = (ulong)vfunc;        vfunc += delta;    }}