1*48096Sbostic /*-
2*48096Sbostic  * Copyright (c) 1980 The Regents of the University of California.
3*48096Sbostic  * All rights reserved.
4*48096Sbostic  *
5*48096Sbostic  * %sccs.include.redist.c%
622512Sdist  */
75508Slinton 
822512Sdist #ifndef lint
9*48096Sbostic static char sccsid[] = "@(#)resume.c	5.4 (Berkeley) 04/16/91";
10*48096Sbostic #endif /* not lint */
1130848Smckusick 
125508Slinton /*
1311061Slinton  * Resume execution, first setting appropriate registers.
145508Slinton  */
155508Slinton 
165508Slinton #include "defs.h"
175508Slinton #include <signal.h>
185508Slinton #include "process.h"
195508Slinton #include "machine.h"
205508Slinton #include "main.h"
215508Slinton #include "process.rep"
225508Slinton #include "runtime/frame.rep"
235508Slinton 
2411061Slinton #include "machine/pxerrors.h"
2511061Slinton #include "pxinfo.h"
265508Slinton 
275508Slinton /*
2810766Slinton  * Resume execution, set (get) pcode location counter before (after) resuming.
295508Slinton  */
305508Slinton 
315508Slinton resume()
325508Slinton {
335714Slinton     register PROCESS *p;
345508Slinton 
355714Slinton     p = process;
365714Slinton     do {
375714Slinton 	if (option('e')) {
385714Slinton 	    printf("execution resumes at pc 0x%x, lc %d\n", process->pc, pc);
395714Slinton 	    fflush(stdout);
405714Slinton 	}
415714Slinton 	pcont(p);
4236538Smckusick 	dread(&pc, PCADDR, sizeof(pc));		/* Get pcode pc */
435714Slinton 	if (option('e')) {
445714Slinton 	    printf("execution stops at pc 0x%x, lc %d on sig %d\n",
455714Slinton 		process->pc, pc, p->signo);
465714Slinton 	    fflush(stdout);
475714Slinton 	}
485714Slinton     } while (p->signo == SIGCONT);
4911061Slinton     if (option('r') && p->signo != 0) {
5011061Slinton 	choose();
5111061Slinton     }
5210766Slinton 
5310766Slinton     /*
5410766Slinton      * If px implements a breakpoint by executing a halt instruction
5511061Slinton      * the real pc must be incremented to skip over it.
5611061Slinton      *
5711061Slinton      * Currently, px sends itself a signal so no incrementing is needed.
5811061Slinton      *
5911061Slinton 	if (isbperr()) {
6011061Slinton 	    p->pc++;
6111061Slinton 	}
6210766Slinton      */
635508Slinton }
645508Slinton 
655508Slinton /*
665508Slinton  * Under the -r option, we offer the opportunity to just get
675508Slinton  * the px traceback and not actually enter the debugger.
686074Slinton  *
696074Slinton  * If the standard input is not a tty but standard error is,
706074Slinton  * change standard input to be /dev/tty.
715508Slinton  */
725508Slinton 
735508Slinton LOCAL choose()
745508Slinton {
755714Slinton     register int c;
765508Slinton 
776873Slinton     if (!isterm(stdin)) {
786873Slinton 	if (!isterm(stderr) || freopen("/dev/tty", "r", stdin) == NIL) {
796074Slinton 	    unsetsigtraces(process);
806074Slinton 	    pcont(process);
816074Slinton 	    quit(process->exitval);
826074Slinton 	    /* NOTREACHED */
836074Slinton 	}
846074Slinton     }
855714Slinton     fprintf(stderr, "\nProgram error");
865714Slinton     fprintf(stderr, "\nDo you wish to enter the debugger? ");
875714Slinton     c = getchar();
885714Slinton     if (c == 'n') {
895714Slinton 	unsetsigtraces(process);
905714Slinton 	pcont(process);
915714Slinton 	quit(process->exitval);
925714Slinton     }
936074Slinton     while (c != '\n' && c != EOF) {
945508Slinton 	c = getchar();
955714Slinton     }
965714Slinton     fprintf(stderr, "\nEntering debugger ...");
975714Slinton     init();
985714Slinton     option('r') = FALSE;
995714Slinton     fprintf(stderr, " type 'help' for help.\n");
1005508Slinton }
101