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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
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