1 /*
2  * Copyright (c) 1980 Regents of the University of California.
3  * All rights reserved.  The Berkeley software License Agreement
4  * specifies the terms and conditions for redistribution.
5  */
6 
7 #ifndef lint
8 static char sccsid[] = "@(#)start.c	5.1 (Berkeley) 06/06/85";
9 #endif not lint
10 /*
11  * Begin execution.
12  *
13  * For px, pstart does a traced exec to read in px and then stop.  But we
14  * want control after px has read in the obj file and before it starts
15  * executing.  The zeroth argument to px tells it to give us control
16  * by sending itself a signal just prior to interpreting.
17  *
18  * We set a "END_BP" breakpoint at the end of the code so that the
19  * process data doesn't disappear after the program terminates.
20  */
21 
22 #include "defs.h"
23 #include <signal.h>
24 #include "process.h"
25 #include "machine.h"
26 #include "main.h"
27 #include "breakpoint.h"
28 #include "source.h"
29 #include "object.h"
30 #include "mappings.h"
31 #include "sym.h"
32 #include "process.rep"
33 
34 #   if (isvaxpx)
35 #       include "pxinfo.h"
36 #   endif
37 
38 start(argv, infile, outfile)
39 char **argv;
40 char *infile, *outfile;
41 {
42     char *cmd;
43 
44     setsigtrace();
45 #   if (isvaxpx)
46 	cmd = "px";
47 #   else
48 	cmd = argv[0];
49 #   endif
50     pstart(process, cmd, argv, infile, outfile);
51     if (process->status == STOPPED) {
52 #       if (isvaxpx)
53 	    TRAPARGS *ap, t;
54 
55 	    pcont(process);
56 	    if (process->status != STOPPED) {
57 		if (option('t')) {
58 		    quit(process->exitval);
59 		} else {
60 		    panic("px exited with %d", process->exitval);
61 		}
62 	    }
63 	    dread(&ap, process->fp + 2*sizeof(int), sizeof(ap));
64 	    dread(&t, ap, sizeof(TRAPARGS));
65 	    if (t.nargs != 5) {
66 		if (option('t')) {
67 		    unsetsigtraces(process);
68 		    pcont(process);
69 		    quit(process->exitval);
70 		} else {
71 		    panic("start: args out of sync");
72 		}
73 	    }
74 	    DISPLAY = t.disp;
75 	    DP = t.dp;
76 	    ENDOFF = t.objstart;
77 	    PCADDRP = t.pcaddrp;
78 	    LOOPADDR = t.loopaddr;
79 #       endif
80 	pc = 0;
81 	curfunc = program;
82 	if (objsize != 0) {
83 	    addbp(lastaddr(), END_BP, NIL, NIL, NIL, 0);
84 	}
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     if (ss_variables) {
100 	prvarnews();
101     }
102     printf("\nexecution completed\n");
103     curfunc = program;
104     skimsource(srcfilename(pc));
105     curline = lastlinenum;
106     erecover();
107 }
108 
109 /*
110  * set up what signals we want to trace
111  */
112 
113 LOCAL setsigtrace()
114 {
115     register int i;
116     register PROCESS *p;
117 
118     p = process;
119     psigtrace(p, SIGINT, TRUE);
120     psigtrace(p, SIGTRAP, TRUE);
121     psigtrace(p, SIGIOT, TRUE);
122     psigtrace(p, SIGILL, TRUE);
123     psigtrace(p, SIGBUS, TRUE);
124 }
125