From 84bb06ea6002b93b6efe513d0b02381640892f6b Mon Sep 17 00:00:00 2001
From: ripsaw8080 <ripsaw8080@users.sourceforge.net>
Date: Sat, 10 Jan 2015 13:47:31 +0000
Subject: [PATCH] Arrange stack to restore registers when a child PSP is
 terminated. Fixes crashes in some demos (Blashphemy by Fatal Justice,
 Dreamwar by Elfsong, Mystic by Xenogenesis, et al).

Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@3892
---
 src/dos/dos_execute.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/dos/dos_execute.cpp b/src/dos/dos_execute.cpp
index 5538d721..78572309 100644
--- a/src/dos/dos_execute.cpp
+++ b/src/dos/dos_execute.cpp
@@ -225,6 +225,10 @@ bool DOS_ChildPSP(Bit16u segment, Bit16u size) {
 	psp.SetFCB2(RealMake(parent_psp_seg,0x6c));
 	psp.SetEnvironment(psp_parent.GetEnvironment());
 	psp.SetSize(size);
+	// push registers in case child PSP is terminated
+	SaveRegisters();
+	psp.SetStack(RealMakeSeg(ss,reg_sp));
+	reg_sp+=18;
 	return true;
 }