base-linux: omit stack-area init for lx_hybrid

Fixes #2030

repos/base-linux/lib/mk/base.mk

@@ -9,4 +9,4 @@ include $(REP_DIR)/lib/mk/base.inc
 LIBS   += startup
 SRC_CC += thread.cc thread_myself.cc thread_linux.cc
 SRC_CC += capability_space.cc capability_raw.cc
-
+SRC_CC += attach_stack_area.cc

repos/base-linux/src/include/base/internal/platform_env.h

@@ -118,6 +118,11 @@ class Genode::Platform_env : public Platform_env_base,
 		constexpr static size_t  _emergency_ram_size() { return 8*1024; }
 		Ram_dataspace_capability _emergency_ram_ds;
 
+		/**
+		 * Attach stack area to local address space (for non-hybrid components)
+		 */
+		void _attach_stack_area();
+
 	public:
 
 		/**

repos/base-linux/src/lib/base/attach_stack_area.cc

@@ -0,0 +1,29 @@
+/*
+ * \brief  Attach stack area to local address space
+ * \author Norman Feske
+ * \date   2016-07-06
+ *
+ * This function resides in a distinct compilation unit because it is not
+ * used for hybrid components where the Genode::Thread API is implemented
+ * via POSIX threads.
+ */
+
+/*
+ * Copyright (C) 2016 Genode Labs GmbH
+ *
+ * This file is part of the Genode OS framework, which is distributed
+ * under the terms of the GNU General Public License version 2.
+ */
+
+/* base-internal includes */
+#include <base/internal/platform_env.h>
+
+using namespace Genode;
+
+
+void Platform_env::_attach_stack_area()
+{
+	_local_pd_session._address_space.attach_at(_local_pd_session._stack_area.dataspace(),
+	                                           stack_area_virtual_base(),
+	                                           stack_area_virtual_size());
+}

repos/base-linux/src/lib/base/platform_env.cc

@@ -154,10 +154,7 @@ Platform_env::Platform_env()
 	_heap(Platform_env_base::ram_session(), Platform_env_base::rm_session()),
 	_emergency_ram_ds(ram_session()->alloc(_emergency_ram_size()))
 {
-	/* attach stack area to local address space */
-	_local_pd_session._address_space.attach_at(_local_pd_session._stack_area.dataspace(),
-	                                           stack_area_virtual_base(),
-	                                           stack_area_virtual_size());
+	_attach_stack_area();
 
 	env_stack_area_region_map  = &_local_pd_session._stack_area;
 	env_stack_area_ram_session = ram_session();

repos/base-linux/src/lib/lx_hybrid/lx_hybrid.cc

@@ -21,6 +21,7 @@
 /* base-internal includes */
 #include <base/internal/native_thread.h>
 #include <base/internal/globals.h>
+#include <base/internal/platform_env.h>
 
 
 /**
@@ -525,3 +526,17 @@ Thread::~Thread()
 	/* inform core about the killed thread */
 	_cpu_session->kill_thread(_thread_cap);
 }
+
+
+/******************
+ ** Platform_env **
+ ******************/
+
+void Platform_env::_attach_stack_area()
+{
+	/*
+	 * Omit attaching the stack area to the local address space for hybrid
+	 * components. Otherwise, it may collide with the (randomized) loading
+	 * locations of shared objects or the binary.
+	 */
+}