# HG changeset patch
# User Gorka Guardiola <paurea@gmail.com>
# Date 1331806938 -3600
# Node ID 9323f8fa6d56c87847052d79e05a0e44a329109b
# Parent  0de9c3c7dd45addaf9daabe59aa1d1ea9f4e1a05
selectors: not saving and restoring the selectors
breaks programs.

R=nixiedev, nemo
CC=nix-dev
http://codereview.appspot.com/5821046

diff -r 0de9c3c7dd45 -r 9323f8fa6d56 sys/src/nix/k10/l64idt.s
--- a/sys/src/nix/k10/l64idt.s	Thu Mar 15 09:58:11 2012 +0100
+++ b/sys/src/nix/k10/l64idt.s	Thu Mar 15 11:22:18 2012 +0100
@@ -22,10 +22,10 @@
 
 	MOVQ	RUSER, 0(SP)
 	MOVQ	RMACH, 8(SP)
-//	MOVW	DS, 16(SP)
-//	MOVW	ES, 18(SP)
-//	MOVW	FS, 20(SP)
-//	MOVW	GS, 22(SP)
+	MOVW	DS, 16(SP)
+	MOVW	ES, 18(SP)
+	MOVW	FS, 20(SP)
+	MOVW	GS, 22(SP)
 
 	SWAPGS
 	BYTE $0x65; MOVQ 0, RMACH		/* m-> (MOVQ GS:0x0, R15) */
@@ -71,11 +71,13 @@
 	JEQ	_iretnested
 
 	SWAPGS
-	/* per the architecture manual, moving 16 bits to FS can zero it. Bad ... */
-//	MOVW	22(SP), GS
-//	MOVW	20(SP), FS
-//	MOVW	18(SP), ES
-//	MOVW	16(SP), DS
+	/*	per the architecture manual, moving 16 bits to FS can zero it. Bad ... 
+	 *	not restoring it gives back the bad segment selector bug
+	 */
+	MOVW	22(SP), GS
+	MOVW	20(SP), FS
+	MOVW	18(SP), ES
+	MOVW	16(SP), DS
 	MOVQ	8(SP), RMACH
 	MOVQ	0(SP), RUSER