From 8cd8c801b633e2ca53f229dff7c1ea878e1cf0d8 Mon Sep 17 00:00:00 2001
From: deraadt <deraadt@openbsd.org>
Date: Thu, 2 May 1996 13:42:56 +0000
Subject: [PATCH] sync with netbsd

---
 sys/arch/i386/i386/vm86.c | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

diff --git a/sys/arch/i386/i386/vm86.c b/sys/arch/i386/i386/vm86.c
index 9ce1c9db6da..9dda35ab6de 100644
--- a/sys/arch/i386/i386/vm86.c
+++ b/sys/arch/i386/i386/vm86.c
@@ -1,5 +1,5 @@
-/*	$OpenBSD: vm86.c,v 1.4 1996/04/21 22:16:42 deraadt Exp $	*/
-/*	$NetBSD: vm86.c,v 1.9 1996/04/12 05:57:43 mycroft Exp $	*/
+/*	$OpenBSD: vm86.c,v 1.5 1996/05/02 13:42:56 deraadt Exp $	*/
+/*	$NetBSD: vm86.c,v 1.13 1996/04/25 13:50:21 mycroft Exp $	*/
 
 /*-
  * Copyright (c) 1996 The NetBSD Foundation, Inc.
@@ -269,6 +269,7 @@ vm86_return(p, retval)
 #define	CLI	0xFA
 #define	STI	0xFB
 #define	INTxx	0xCD
+#define	INTO	0xCE
 #define	IRET	0xCF
 #define	OPSIZ	0x66
 #define	INT3	0xCC	/* Actually the process gets 32-bit IDT to handle it */
@@ -292,14 +293,17 @@ vm86_gpfault(p, type)
 	 * address space for checking.  remember that the frame's
 	 * segment selectors are real-mode style selectors.
 	 */
-	u_char tmpbyte;
 	u_long cs, ip, ss, sp;
+	u_char tmpbyte;
+	int trace;
 
 	cs = CS(tf) << 4;
 	ip = IP(tf);
 	ss = SS(tf) << 4;
 	sp = SP(tf);
 
+	trace = tf->tf_eflags & PSL_T;
+
 	/*
 	 * For most of these, we must set all the registers before calling
 	 * macros/functions which might do a vm86_return.
@@ -327,6 +331,11 @@ vm86_gpfault(p, type)
 		fast_intxx(p, tmpbyte);
 		break;
 
+	case INTO:
+		if (tf->tf_eflags & PSL_V)
+			fast_intxx(p, 4);
+		break;
+
 	case PUSHF:
 		putword(ss, sp, get_vflags_short(p));
 		SP(tf) = sp;
@@ -368,6 +377,9 @@ vm86_gpfault(p, type)
 		IP(tf) -= 1;
 		goto bad;
 	}
+
+	if (trace && tf->tf_eflags & PSL_VM)
+		trapsignal(p, SIGTRAP, T_TRCTRAP);
 	return;
 
 bad:
-- 
2.20.1