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From: Andriy Gapon <avg@FreeBSD.org>
Date: Tue, 21 Sep 2010 15:07:44 +0000 (UTC)
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Subject: svn commit: r212964 - head/sys/kern
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Author: avg
Date: Tue Sep 21 15:07:44 2010
New Revision: 212964
URL: http://svn.freebsd.org/changeset/base/212964

Log:
  kdb_backtrace: stack(9)-based code to print backtrace without any backend
  
  The idea is to add KDB and KDB_TRACE options to GENERIC kernels on
  stable branches, so that at least the minimal information is produced
  for non-specific panics like traps on page faults.
  The GENERICs in stable branches seem to already include STACK option.
  
  Reviewed by:	attilio
  MFC after:	2 weeks

Modified:
  head/sys/kern/subr_kdb.c

Modified: head/sys/kern/subr_kdb.c
==============================================================================
--- head/sys/kern/subr_kdb.c	Tue Sep 21 12:57:43 2010	(r212963)
+++ head/sys/kern/subr_kdb.c	Tue Sep 21 15:07:44 2010	(r212964)
@@ -28,6 +28,7 @@
 __FBSDID("$FreeBSD$");
 
 #include "opt_kdb.h"
+#include "opt_stack.h"
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -37,6 +38,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/pcpu.h>
 #include <sys/proc.h>
 #include <sys/smp.h>
+#include <sys/stack.h>
 #include <sys/sysctl.h>
 
 #include <machine/kdb.h>
@@ -300,6 +302,15 @@ kdb_backtrace(void)
 		printf("KDB: stack backtrace:\n");
 		kdb_dbbe->dbbe_trace();
 	}
+#ifdef STACK
+	else {
+		struct stack st;
+
+		printf("KDB: stack backtrace:\n");
+		stack_save(&st);
+		stack_print(&st);
+	}
+#endif
 }
 
 /*