From 0afbc83dfd1e2826a3ad7d2cec5fcca8f17267e2 Mon Sep 17 00:00:00 2001
From: Peter Wemm <peter@FreeBSD.org>
Date: Fri, 30 May 2003 00:58:48 +0000
Subject: [PATCH] Add setjmp/longjmp for ddb

---
 sys/amd64/amd64/support.S | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/sys/amd64/amd64/support.S b/sys/amd64/amd64/support.S
index 2f1f34664ffb..422527efeeae 100644
--- a/sys/amd64/amd64/support.S
+++ b/sys/amd64/amd64/support.S
@@ -33,6 +33,8 @@
  * $FreeBSD$
  */
 
+#include "opt_ddb.h"
+
 #include <machine/asmacros.h>
 #include <machine/pmap.h>
 
@@ -624,3 +626,36 @@ ENTRY(lgdt)
 	pushq	$KCSEL
 	pushq	%rax
 	lretq
+
+#ifdef DDB
+/*****************************************************************************/
+/* setjump, longjump                                                         */
+/*****************************************************************************/
+
+ENTRY(setjmp)
+	movq	%rbx,0(%rdi)			/* save rbx */
+	movq	%rsp,8(%rdi)			/* save rsp */
+	movq	%rbp,16(%rdi)			/* save rbp */
+	movq	%r12,24(%rdi)			/* save r12 */
+	movq	%r13,32(%rdi)			/* save r13 */
+	movq	%r14,40(%rdi)			/* save r14 */
+	movq	%r15,48(%rdi)			/* save r15 */
+	movq	0(%rsp),%rdx			/* get rta */
+	movq	%rdx,56(%rdi)			/* save rip */
+	xorl	%eax,%eax			/* return(0); */
+	ret
+
+ENTRY(longjmp)
+	movq	0(%rdi),%rbx			/* restore rbx */
+	movq	8(%rdi),%rsp			/* restore rsp */
+	movq	16(%rdi),%rbp			/* restore rbp */
+	movq	24(%rdi),%r12			/* restore r12 */
+	movq	32(%rdi),%r13			/* restore r13 */
+	movq	40(%rdi),%r14			/* restore r14 */
+	movq	48(%rdi),%r15			/* restore r15 */
+	movq	56(%rdi),%rdx			/* get rta */
+	movq	%rdx,0(%rsp)			/* put in return frame */
+	xorl	%eax,%eax			/* return(1); */
+	incl	%eax
+	ret
+#endif