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From: Marcel Moolenaar <marcel@FreeBSD.org>
To: Perforce Change Reviews <perforce@freebsd.org>
Subject: PERFORCE change 48677 for review
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http://perforce.freebsd.org/chv.cgi?CH=48677

Change 48677 by marcel@marcel_nfs on 2004/03/10 21:31:12

	First draft of the KDB backend interface.

Affected files ...

.. //depot/projects/gdb/sys/kern/subr_kdb.c#3 edit
.. //depot/projects/gdb/sys/sys/kdb.h#2 edit

Differences ...

==== //depot/projects/gdb/sys/kern/subr_kdb.c#3 (text+ko) ====

@@ -30,10 +30,14 @@
 #include <sys/param.h>
 #include <sys/systm.h>
 #include <sys/kdb.h>
+#include <sys/kernel.h>
 
 int kdb_active = 0;
 struct kdb_dbbe *kdb_cur = NULL;
 
+KDB_BACKEND(null, NULL, NULL, NULL, NULL);
+SET_DECLARE(kdb_dbbe_set, struct kdb_dbbe);
+
 /*
  * Solaris implements a new BREAK which is initiated by a character sequence
  * CR ~ ^b which is similar to a familiar pattern used on Sun servers by the
@@ -120,9 +124,30 @@
 void
 kdb_init()
 {
+	struct kdb_dbbe *be, **iter;
+	int cur_pri, pri;
 
 	kdb_active = 0;
 	kdb_cur = NULL;
+	cur_pri = -1;
+	SET_FOREACH(iter, kdb_dbbe_set) {
+		be = *iter;
+		pri = (be->dbbe_init != NULL) ? be->dbbe_init() : -1;
+		if (pri >= 0) {
+			if (cur_pri == -1)
+				printf("KDB: debugger backends:");
+			printf(" %s", be->dbbe_name);
+			if (pri > cur_pri) {
+				cur_pri = pri;
+				kdb_cur = be;
+			}
+		}
+	}
+	if (cur_pri != -1) {
+		printf("\n");
+		printf("KDB: current=%s\n", kdb_cur->dbbe_name);
+	} else
+		printf("KDB: no debugger backends present\n");
 }
 
 /*

==== //depot/projects/gdb/sys/sys/kdb.h#2 (text+ko) ====

@@ -44,6 +44,16 @@
 	dbbe_trap_f	*dbbe_trap;
 };
 
+#define	KDB_BACKEND(name, init, trace, enter, trap)	\
+	static struct kdb_dbbe name##_dbbe = {		\
+		.dbbe_name = #name,			\
+		.dbbe_enter = enter,			\
+		.dbbe_init = init,			\
+		.dbbe_trace = trace,			\
+		.dbbe_trap = trap			\
+	};						\
+	DATA_SET(kdb_dbbe_set, name##_dbbe)
+
 extern int kdb_active;			/* Non-zero while in debugger. */
 extern struct kdb_dbbe *kdb_cur;	/* Default debugger backend or NULL. */