From: Ben Gras <ben@minix3.org>
Date: Thu, 20 Nov 2014 16:42:32 +0000 (+0000)
Subject: restore PSW like 9393439a20 for AMD syscall
X-Git-Url: http://zhaoyanbai.com/repos/%22http:/www.isc.org/icons/zpipe.c?a=commitdiff_plain;h=c9278f91709f7b7161c6dc1671806d6d16771556;p=minix.git

restore PSW like 9393439a20 for AMD syscall

Change-Id: Ide0a8727af8d0d81361382dbd2460c7a6c5743fc
---

diff --git a/minix/kernel/arch/i386/mpx.S b/minix/kernel/arch/i386/mpx.S
index 81fb696a3..fa38697e5 100644
--- a/minix/kernel/arch/i386/mpx.S
+++ b/minix/kernel/arch/i386/mpx.S
@@ -418,11 +418,17 @@ ENTRY(restore_user_context_syscall)
 	 * enabling interrupts, and of course sysret instead of sysexit.
 	 */
 	mov	4(%esp), %ebp		/* retrieve proc ptr arg */
+
+        /* restore PSW (before we switch to user stack!) */
+        movl    PSWREG(%ebp), %edi      /* load desired PSW to EDI */
+        push    %edi
+        popf
+
 	mov	PCREG(%ebp), %ecx	/* sysret restores EIP using ECX */
 	mov	SPREG(%ebp), %esp	/* restore ESP directly */
 	mov	AXREG(%ebp), %eax	/* trap return value */
 	mov	BXREG(%ebp), %ebx	/* secondary return value */
-	movl	PSWREG(%ebp), %edi	/* load desired PSW to EDI */
+
 	sysret				/* jump to EIP in user */
 
 ENTRY(restore_user_context_int)