1 /* Copyright (c) 1982 Regents of the University of California */
2 
3 static char sccsid[] = "@(#)start.c 1.4 02/10/82";
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 LOCAL PROCESS pbuf;
34 
35 start(argv, infile, outfile)
36 char **argv;
37 char *infile, *outfile;
38 {
39     char *cmd;
40 
41     process = &pbuf;
42     setsigtrace();
43 #   if (isvaxpx)
44 	cmd = "px";
45 #   else
46 	cmd = argv[0];
47 #   endif
48     pstart(process, cmd, argv, infile, outfile);
49     if (process->status == STOPPED) {
50 #       if (isvaxpx)
51 	    TRAPARGS *ap, t;
52 
53 	    pcont(process);
54 	    if (process->status != STOPPED) {
55 		if (option('t')) {
56 		    quit(process->exitval);
57 		} else {
58 		    panic("px exited with %d", process->exitval);
59 		}
60 	    }
61 	    dread(&ap, process->fp + 2*sizeof(int), sizeof(ap));
62 	    dread(&t, ap, sizeof(TRAPARGS));
63 	    if (t.nargs != 5) {
64 		if (option('t')) {
65 		    unsetsigtraces(process);
66 		    pcont(process);
67 		    quit(process->exitval);
68 		} else {
69 		    panic("start: args out of sync");
70 		}
71 	    }
72 	    DISPLAY = t.disp;
73 	    DP = t.dp;
74 	    ENDOFF = t.objstart;
75 	    PCADDRP = t.pcaddrp;
76 	    LOOPADDR = t.loopaddr;
77 #       endif
78 	pc = 0;
79 	curfunc = program;
80 	if (objsize != 0) {
81 	    addbp(lastaddr(), END_BP, NIL, NIL, NIL, 0);
82 	}
83     } else {
84 	panic("could not start program");
85     }
86 }
87 
88 /*
89  * Note the termination of the program.  We do this so as to avoid
90  * having the process exit, which would make the values of variables
91  * inaccessible.
92  *
93  * Although the END_BP should really be deleted, it is taken
94  * care of by fixbps the next time the program runs.
95  */
96 
97 endprogram()
98 {
99     char *filename;
100 
101     if (ss_variables) {
102 	prvarnews();
103     }
104     printf("\nexecution completed\n");
105     curfunc = program;
106     if ((filename = srcfilename(pc)) != cursource) {
107 	skimsource(filename);
108     }
109     curline = lastlinenum;
110     erecover();
111 }
112 
113 /*
114  * set up what signals we want to trace
115  */
116 
117 LOCAL setsigtrace()
118 {
119     register int i;
120     register PROCESS *p;
121 
122     p = process;
123     psigtrace(p, SIGINT, TRUE);
124     psigtrace(p, SIGTRAP, TRUE);
125     psigtrace(p, SIGIOT, TRUE);
126     psigtrace(p, SIGILL, TRUE);
127 }
128