From d03f429727e0e61fad4b52c9bc94011b85ef7b21 Mon Sep 17 00:00:00 2001
From: Corinna Vinschen <corinna@vinschen.de>
Date: Thu, 12 Nov 2015 11:48:30 +0100
Subject: [PATCH] Fix crash at process init on 64 bit XP/2003 under WOW64

	* init.cc (munge_threadfunc): Don't call NtQueryInformationThread with
	ThreadQuerySetWin32StartAddress info class on XP 64 and Server 2003 64.
	It crashes.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
---
 winsup/cygwin/ChangeLog     |  6 ++++++
 winsup/cygwin/init.cc       |  9 ++++++---
 winsup/cygwin/release/2.3.1 | 14 ++++++++++++++
 3 files changed, 26 insertions(+), 3 deletions(-)
 create mode 100644 winsup/cygwin/release/2.3.1

diff --git a/winsup/cygwin/ChangeLog b/winsup/cygwin/ChangeLog
index 0e96d150e..8e40c2f31 100644
--- a/winsup/cygwin/ChangeLog
+++ b/winsup/cygwin/ChangeLog
@@ -1,3 +1,9 @@
+2015-11-12  Corinna Vinschen  <corinna@vinschen.de>
+
+	* init.cc (munge_threadfunc): Don't call NtQueryInformationThread with
+	ThreadQuerySetWin32StartAddress info class on XP 64 and Server 2003 64.
+	It crashes.
+
 2015-11-09  Corinna Vinschen  <corinna@vinschen.de>
 
 	* include/cygwin/version.h (CYGWIN_VERSION_DLL_MINOR): Bump to 1.
diff --git a/winsup/cygwin/init.cc b/winsup/cygwin/init.cc
index 69e66a029..c6f0e3de9 100644
--- a/winsup/cygwin/init.cc
+++ b/winsup/cygwin/init.cc
@@ -57,9 +57,12 @@ munge_threadfunc ()
     {
       char *threadfunc = NULL;
 
-      NtQueryInformationThread (NtCurrentThread (),
-				ThreadQuerySetWin32StartAddress,
-				&threadfunc, sizeof threadfunc, NULL);
+      if (wincap.wow64_has_secondary_stack ())
+	threadfunc = ebp[threadfunc_ix[0]];
+      else
+	NtQueryInformationThread (NtCurrentThread (),
+				  ThreadQuerySetWin32StartAddress,
+				  &threadfunc, sizeof threadfunc, NULL);
       if (!search_for || threadfunc == search_for)
 	{
 	  search_for = NULL;
diff --git a/winsup/cygwin/release/2.3.1 b/winsup/cygwin/release/2.3.1
new file mode 100644
index 000000000..5299d2304
--- /dev/null
+++ b/winsup/cygwin/release/2.3.1
@@ -0,0 +1,14 @@
+What's new:
+-----------
+
+
+What changed:
+-------------
+
+
+Bug Fixes
+---------
+
+- The fix for wine introduced in 2.3.0 crashes in 32 bit Cygwin on 64 bit XP
+  and 64 bit Server 2003 only.   This should work now.
+  Addresses: https://cygwin.com/ml/cygwin/2015-11/msg00187.html