PERFORCE change 137866 for review

[John Birrell]

http://perforce.freebsd.org/chv.cgi?CH=137866

Change 137866 by jb at jb_freebsd8 on 2008/03/16 21:15:35

	Handle double traps on amd64 the same was as on i386 so that the
	double trap details are printed correctly and we end up in ddb 
	rather than just rebooting.

Affected files ...

.. //depot/projects/dtrace/src/sys/amd64/amd64/trap.c#23 edit

Differences ...

==== //depot/projects/dtrace/src/sys/amd64/amd64/trap.c#23 (text+ko) ====

@@ -105,6 +105,8 @@
  */
 dtrace_trap_func_t	dtrace_trap_func;
 
+dtrace_doubletrap_func_t	dtrace_doubletrap_func;
+
 /*
  * This is a hook which is initialised by the systrace module
  * when it is loaded. This keeps the DTrace syscall provider
@@ -771,6 +773,10 @@
 void
 dblfault_handler(struct trapframe *frame)
 {
+#ifdef KDTRACE_HOOKS
+	if (dtrace_doubletrap_func != NULL)
+		(*dtrace_doubletrap_func)();
+#endif
 	printf("\nFatal double fault\n");
 	printf("rip = 0x%lx\n", frame->tf_rip);
 	printf("rsp = 0x%lx\n", frame->tf_rsp);