1 /* Copyright (c) 1982 Regents of the University of California */
2 
3 static char sccsid[] = "@(#)start.c 1.2 02/02/82";
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 	for (i = 1; i < NSIG; i++) {
124 		psigtrace(p, i, TRUE);
125 	}
126 	psigtrace(p, SIGHUP, FALSE);
127 	psigtrace(p, SIGKILL, FALSE);
128 }
129