From d0f5f62d8b8081e25133db2bebcdb43edd51573e Mon Sep 17 00:00:00 2001
From: Jeff Roberson <jeff@FreeBSD.org>
Date: Wed, 3 Aug 2005 04:33:48 +0000
Subject: [PATCH] - Add support for saving stack traces and displaying them via
 printf(9)   and KTR.

Contributed by:		Antoine Brodin <antoine.brodin@laposte.net>
Concept code from:	Neal Fachan <neal@isilon.com>
---
 sys/amd64/amd64/db_trace.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/sys/amd64/amd64/db_trace.c b/sys/amd64/amd64/db_trace.c
index e48eff8bb264..264daaa1d1f2 100644
--- a/sys/amd64/amd64/db_trace.c
+++ b/sys/amd64/amd64/db_trace.c
@@ -31,6 +31,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/systm.h>
 #include <sys/kdb.h>
 #include <sys/proc.h>
+#include <sys/stack.h>
 #include <sys/sysent.h>
 
 #include <machine/cpu.h>
@@ -495,6 +496,28 @@ db_trace_thread(struct thread *thr, int count)
 		    ctx->pcb_rip, count));
 }
 
+void
+stack_save(struct stack *st)
+{
+	struct amd64_frame *frame;
+	vm_offset_t callpc;
+	register_t rbp;
+
+	stack_zero(st);
+	__asm __volatile("movq %%rbp,%0" : "=r" (rbp));
+	frame = (struct amd64_frame *)rbp;
+	while (1) {
+		if (!INKERNEL((long)frame))
+			break;
+		callpc = frame->f_retaddr;
+		if (!INKERNEL(callpc))
+			break;
+		if (stack_put(st, callpc) == -1)
+			break;
+		frame = frame->f_frame;
+	}
+}
+
 int
 amd64_set_watch(watchnum, watchaddr, size, access, d)
 	int watchnum;