From 4453c6dc677c67dba7385cbabd165577ceba8d1a Mon Sep 17 00:00:00 2001
From: Peter Wemm <peter@FreeBSD.org>
Date: Thu, 14 Apr 2005 00:02:37 +0000
Subject: [PATCH] Attempt i386_set_gsbase() before using the user_ldt code. 
 Unimplemented sysarch() calls return EINVAL, not SIGSYS.. so we can trivially
 adapt.

---
 lib/libc/i386/gen/_set_tp.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lib/libc/i386/gen/_set_tp.c b/lib/libc/i386/gen/_set_tp.c
index 2380e99fe04a..287e0f2a6d0a 100644
--- a/lib/libc/i386/gen/_set_tp.c
+++ b/lib/libc/i386/gen/_set_tp.c
@@ -36,8 +36,11 @@ _set_tp(void *tp)
 {
 #ifndef COMPAT_32BIT
 	union descriptor ldt;
-	int sel;
+	int error, sel;
 
+	error = i386_set_gsbase(tp);
+	if (error == 0)
+		return;
 	memset(&ldt, 0, sizeof(ldt));
 	ldt.sd.sd_lolimit = 0xffff;	/* 4G limit */
 	ldt.sd.sd_lobase = ((uintptr_t)tp) & 0xffffff;