1 /* Copyright (c) 1982 Regents of the University of California */
2 
3 static char sccsid[] = "@(#)start.c 1.6 03/08/82";
4 
5 /*
6  * Begin execution.
7  *
8  * For px, pstart does a traced exec to read in px and then stop.  But we
9  * want control after px has read in the obj file and before it starts
10  * executing.  The zeroth argument to px tells it to give us control
11  * by sending itself a signal just prior to interpreting.
12  *
13  * We set a "END_BP" breakpoint at the end of the code so that the
14  * process data doesn't disappear after the program terminates.
15  */
16 
17 #include "defs.h"
18 #include <signal.h>
19 #include "process.h"
20 #include "machine.h"
21 #include "main.h"
22 #include "breakpoint.h"
23 #include "source.h"
24 #include "object.h"
25 #include "mappings.h"
26 #include "sym.h"
27 #include "process.rep"
28 
29 #   if (isvaxpx)
30 #       include "pxinfo.h"
31 #   endif
32 
33 start(argv, infile, outfile)
34 char **argv;
35 char *infile, *outfile;
36 {
37     char *cmd;
38 
39     setsigtrace();
40 #   if (isvaxpx)
41 	cmd = "px";
42 #   else
43 	cmd = argv[0];
44 #   endif
45     pstart(process, cmd, argv, infile, outfile);
46     if (process->status == STOPPED) {
47 #       if (isvaxpx)
48 	    TRAPARGS *ap, t;
49 
50 	    pcont(process);
51 	    if (process->status != STOPPED) {
52 		if (option('t')) {
53 		    quit(process->exitval);
54 		} else {
55 		    panic("px exited with %d", process->exitval);
56 		}
57 	    }
58 	    dread(&ap, process->fp + 2*sizeof(int), sizeof(ap));
59 	    dread(&t, ap, sizeof(TRAPARGS));
60 	    if (t.nargs != 5) {
61 		if (option('t')) {
62 		    unsetsigtraces(process);
63 		    pcont(process);
64 		    quit(process->exitval);
65 		} else {
66 		    panic("start: args out of sync");
67 		}
68 	    }
69 	    DISPLAY = t.disp;
70 	    DP = t.dp;
71 	    ENDOFF = t.objstart;
72 	    PCADDRP = t.pcaddrp;
73 	    LOOPADDR = t.loopaddr;
74 #       endif
75 	pc = 0;
76 	curfunc = program;
77 	if (objsize != 0) {
78 	    addbp(lastaddr(), END_BP, NIL, NIL, NIL, 0);
79 	}
80     } else {
81 	panic("could not start program");
82     }
83 }
84 
85 /*
86  * Note the termination of the program.  We do this so as to avoid
87  * having the process exit, which would make the values of variables
88  * inaccessible.
89  *
90  * Although the END_BP should really be deleted, it is taken
91  * care of by fixbps the next time the program runs.
92  */
93 
94 endprogram()
95 {
96     if (ss_variables) {
97 	prvarnews();
98     }
99     printf("\nexecution completed\n");
100     curfunc = program;
101     skimsource(srcfilename(pc));
102     curline = lastlinenum;
103     erecover();
104 }
105 
106 /*
107  * set up what signals we want to trace
108  */
109 
110 LOCAL setsigtrace()
111 {
112     register int i;
113     register PROCESS *p;
114 
115     p = process;
116     psigtrace(p, SIGINT, TRUE);
117     psigtrace(p, SIGTRAP, TRUE);
118     psigtrace(p, SIGIOT, TRUE);
119     psigtrace(p, SIGILL, TRUE);
120     psigtrace(p, SIGBUS, TRUE);
121 }
122