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From 936cfa5a59ef5e9b1c58ab3d06626ba791b17be7 Mon Sep 17 00:00:00 2001
From: Justus Winter <4winter@informatik.uni-hamburg.de>
Date: Mon, 4 May 2015 02:14:49 +0200
Subject: [PATCH gnumach 06/10] optimize
---
i386/i386/locore.S | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/i386/i386/locore.S b/i386/i386/locore.S
index ed51cb8..99fbfb6 100644
--- a/i386/i386/locore.S
+++ b/i386/i386/locore.S
@@ -1279,11 +1279,10 @@ ENTRY(sysenter_entry)
movl %ebx, %ecx
or $(KERNEL_STACK_SIZE-1),%ecx
movl -3-IKS_SIZE(%ecx), %esp /* switch to PCB stack */
- addl $(ISS_SIZE - 16), %esp /* point to top of structure */ //XXX: magic 16 b/c of vm86
+ addl $(ISS_SIZE - 16 /* vm86 */ - 6 * 4 /* unused */), %esp
+ /* point to trap number */
- /* Create trap save area. */
- subl $(6 * 4), %esp /* Unused. We save the
- arguments in userspace. */
+ /* Populate trap save area. */
pushl $0x7fffffff /* trap number */
pushl $0x12345678 /* unused */
pushl SE_STACK_POINTER(%ebp) /* ecx */
--
2.1.4
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