From 9e79eb43b9ce606a10a8815e4858b377fa94c979 Mon Sep 17 00:00:00 2001
From: Jonghyun Park <parjong@gmail.com>
Date: Thu, 23 Mar 2017 07:25:19 +0900
Subject: [PATCH] [x86/Linux] 16-byte aligned TheUMEntryPrestub (#10376)

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

diff --git a/src/vm/i386/umthunkstub.S b/src/vm/i386/umthunkstub.S
index 7f0250368b..98f96ef6ec 100644
--- a/src/vm/i386/umthunkstub.S
+++ b/src/vm/i386/umthunkstub.S
@@ -10,12 +10,16 @@
 // eax = UMEntryThunk*
 //
 NESTED_ENTRY TheUMEntryPrestub, _TEXT, UnhandledExceptionHandlerUnix
+#define STK_ALIGN_PADDING 8
+    sub     esp, STK_ALIGN_PADDING
     push    eax  // UMEntryThunk*
+    CHECK_STACK_ALIGNMENT
     call    C_FUNC(TheUMEntryPrestubWorker)
-    add     esp, 4
-    // eax = PCODE
+    add     esp, (4 + STK_ALIGN_PADDING)
 
+    // eax = PCODE
     jmp     eax     // Tail Jmp
+#undef STK_ALIGN_PADDING
 NESTED_END TheUMEntryPrestub, _TEXT
 
 //
-- 
2.34.1