new copyright; att/bsd/shared

[unix-history] / usr / src / usr.bin / pascal / pdx / process / start.c

/*-
* Copyright (c) 1980 The Regents of the University of California.
* All rights reserved.
*
* %sccs.include.redist.c%
*/

#ifndef lint
static char sccsid[] = "@(#)start.c     5.4 (Berkeley) %G%";
#endif /* not lint */

/*
* Begin execution.
*
* For px, pstart does a traced exec to read in px and then stop.  But we
* want control after px has read in the obj file and before it starts
* executing.  The zeroth argument to px tells it to give us control
* by sending itself a signal just prior to interpreting.
*
* We set a "END_BP" breakpoint at the end of the code so that the
* process data doesn't disappear after the program terminates.
*/

#include "defs.h"
#include <signal.h>
#include "process.h"
#include "machine.h"
#include "main.h"
#include "breakpoint.h"
#include "source.h"
#include "object.h"
#include "mappings.h"
#include "sym.h"
#include "process.rep"

#include "pxinfo.h"

start(argv, infile, outfile)
char **argv;
char *infile, *outfile;
{
   char *cmd;

   setsigtrace();
   cmd = "px";
   pstart(process, cmd, argv, infile, outfile);
   if (process->status == STOPPED) {
       TRAPARGS *ap, t;

       pcont(process);
       if (process->status != STOPPED) {
           if (option('t')) {
               quit(process->exitval);
           } else {
               panic("px exited with %d", process->exitval);
           }
       }
#ifdef tahoe
       dread(&ap, process->fp, sizeof(ap));
       ap = (TRAPARGS *)((unsigned)ap - 4);
       dread(&RETLOC, process->fp - 8, sizeof(RETLOC));
#else
       dread(&ap, process->fp + 2*sizeof(int), sizeof(ap));
#endif
       dread(&t, ap, sizeof(TRAPARGS));

#define NARGS 5
#ifdef tahoe
#       define STKNARGS (sizeof(int)*(NARGS+1))
#       define NARGLOC  t.trp_removed
#else
#       define STKNARGS (NARGS)
#       define NARGLOC  t.nargs
#endif
       if (NARGLOC != STKNARGS) {
           if (option('t')) {
               unsetsigtraces(process);
               pcont(process);
               quit(process->exitval);
           } else {
               panic("start: args out of sync");
           }
       }
       DISPLAY = t.disp;
       DP = t.dp;
       ENDOFF = t.objstart;
       PCADDR = t.pcaddr;
       LOOPADDR = t.loopaddr;
       pc = 0;
       curfunc = program;
       if (objsize != 0) {
           addbp(lastaddr(), END_BP, NIL, NIL, NIL, 0);
       }
   }
}

/*
* Note the termination of the program.  We do this so as to avoid
* having the process exit, which would make the values of variables
* inaccessible.
*
* Although the END_BP should really be deleted, it is taken
* care of by fixbps the next time the program runs.
*/

endprogram()
{
   if (ss_variables) {
       prvarnews();
   }
   printf("\nexecution completed\n");
   curfunc = program;
   skimsource(srcfilename(pc));
   curline = lastlinenum;
   erecover();
}

/*
* set up what signals we want to trace
*/

LOCAL setsigtrace()
{
   register PROCESS *p;

   p = process;
   psigtrace(p, SIGINT, TRUE);
   psigtrace(p, SIGTRAP, TRUE);
   psigtrace(p, SIGIOT, TRUE);
   psigtrace(p, SIGILL, TRUE);
   psigtrace(p, SIGBUS, TRUE);
}