From bbdb8bd8110c1404a115540fd9b6e08190ed981c Mon Sep 17 00:00:00 2001
From: Danila Fedorin <danila.fedorin@gmail.com>
Date: Tue, 23 Apr 2019 16:14:21 -0700
Subject: [PATCH] Avoid corrupting eax during system call.

---
 kern/trapentry.S | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/kern/trapentry.S b/kern/trapentry.S
index 3e7a622..31b211f 100644
--- a/kern/trapentry.S
+++ b/kern/trapentry.S
@@ -81,14 +81,12 @@ TRAPHANDLER(t_default, T_DEFAULT);
 .globl _alltraps
 _alltraps:
 	sub $0x2, %esp
-	mov %ds, %eax
-	push %ax
+	pushw %ds
 	sub $0x2, %esp
-	mov %es, %eax
-	push %ax
+	pushw %es
 	pushal
 	mov $(GD_KD), %eax
-	movl %eax, %ds
-	movl %eax, %es
+	movw %ax, %ds
+	movw %ax, %es
 	pushl %esp
 	call trap