From dd46af86ca22aa1af2f7843a624c436fefd6c51f Mon Sep 17 00:00:00 2001
From: Justus Winter <4winter@informatik.uni-hamburg.de>
Date: Tue, 5 May 2015 20:50:37 +0200
Subject: [PATCH gnumach 09/10] be less stoopid

---
 i386/i386/locore.S | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/i386/i386/locore.S b/i386/i386/locore.S
index 8b4d766..0d08be5 100644
--- a/i386/i386/locore.S
+++ b/i386/i386/locore.S
@@ -1303,10 +1303,7 @@ ENTRY(sysenter_entry)
 	pushl	SE_GS(%ebp)
 
 	xchgl	%ebx, %esp		/* switch to kernel stack */
-	pushl	%ebx			/* save pcb stack pointer */
-	movl	%esp,%ebx		/* save kernel sp for argument
-					   unwinding */
-
+					/* %ebx points to user registers */
 	negl	%eax			/* get system call number */
 	/* xxx sysenter_mach_call_range */
 	jl	mach_call_range		/* out of range if it was positive */
@@ -1361,8 +1358,7 @@ se_args_0:
 	call	*EXT(mach_trap_table)+4(%eax)
 					/* call procedure */
 	cli				/* xxx: sti/cli where ? */
-	movl	%ebx, %esp		/* clean parameters from stack */
-	popl	%esp			/* switch to pcb stack */
+	movl	%ebx, %esp		/* switch to pcb stack */
 	movl	%eax, R_EAX(%esp)	/* save return value */
 	jmp	_return_from_trap	/* check for AST, then... */
 return_from_sysenter:			/* return here */
-- 
2.1.4