diff --git a/Documentation/NuttxPortingGuide.html b/Documentation/NuttxPortingGuide.html
index ec36ac4d11..88155b8cad 100644
--- a/Documentation/NuttxPortingGuide.html
+++ b/Documentation/NuttxPortingGuide.html
@@ -112,7 +112,7 @@
       <a href="#up_addrenv_vdata">4.4.4 <code>up_addrenv_vdata()</code></a></br>
       <a href="#up_addrenv_select">4.4.5 <code>up_addrenv_select()</code></a></br>
       <a href="#up_addrenv_restore">4.4.6 <code>up_addrenv_restore()</code></a></br>
-      <a href="#up_addrenv_assign">4.4.7 <code>up_addrenv_assign()</code></a></br>
+      <a href="#up_addrenv_clone">4.4.7 <code>up_addrenv_clone()</code></a></br>
       <a href="#up_addrenv_attach">4.4.8 <code>up_addrenv_attach()</code></a></br>
       <a href="#up_addrenv_detach">4.4.9 <code>up_addrenv_detach()</code></a>
     </ul>
@@ -2960,8 +2960,8 @@ VxWorks provides the following comparable interface:
         Restore an address environment.
       </li>
       <li>
-        <a href="#up_addrenv_assign">4.4.7 <code>up_addrenv_assign()</code></a>:
-        Assign an address environment to a thread.
+        <a href="#up_addrenv_clone">4.4.7 <code>up_addrenv_clone()</code></a>:
+        Copy an address environment from one location to another.
       </li>
     </ul>
   </li>
@@ -2969,7 +2969,7 @@ VxWorks provides the following comparable interface:
     <p>
       <b>Tasking Support</b>.
       Other interfaces must be provided to support higher-level interfaces used by the NuttX tasking logic.
-      These interfaces are* used by the functions in <code>sched/</code> and all operate on the task group which as been assigned an address environment by <code>up_addrenv_assign()</code>.
+      These interfaces are* used by the functions in <code>sched/</code> and all operate on the task group which as been assigned an address environment by <code>up_addrenv_clone()</code>.
     </p>
     <ul>
       <li>
@@ -3108,19 +3108,19 @@ VxWorks provides the following comparable interface:
   Zero (<code>OK</code>) on success; a negated <code>errno</code> value on failure.
 </ul>
 
-<h3><a name="up_addrenv_assign">4.4.7 <code>up_addrenv_assign()</code></a></h3>
+<h3><a name="up_addrenv_clone">4.4.7 <code>up_addrenv_clone()</code></a></h3>
 <p><b>Function Prototype</b>:<p>
 <ul>
-  <code>int up_addrenv_assign(FAR const group_addrenv_t *addrenv, FAR struct task_group_s *group);</code>
+  <code>int up_addrenv_clone(FAR const task_group_s *src, FAR struct task_group_s *dest);</code>
 </ul>
 <p><b>Description</b>:</p>
 <ul>
-  Assign an address environment to a new task group.
+  Duplicate an address environment.  This does not copy the underlying memory, only the representation that can be used to instantiate that memory as an address environment.
 </ul>
 <p><b>Input Parameters</b>:</p>
 <ul>
-  <li><code>addrenv</code>: The representation of the group address environment previously returned by <code>up_addrenv_create</code>.</li>
-  <li><code>group</code>: The new task group to receive the address environment.</li>
+  <li><code>src</code>: The address environment to be copied.</li>
+  <li><code>dest</code>: The location to receive the copied address environment.</li>
 </ul>
 <p><b>Returned Value</b>:</p>
 <ul>
diff --git a/arch/arm/src/armv7-a/arm_addrenv.c b/arch/arm/src/armv7-a/arm_addrenv.c
index ed3a249fdc..a9e6806192 100644
--- a/arch/arm/src/armv7-a/arm_addrenv.c
+++ b/arch/arm/src/armv7-a/arm_addrenv.c
@@ -48,11 +48,12 @@
  *                        address environment
  *   up_addrenv_select  - Instantiate an address environment
  *   up_addrenv_restore - Restore an address environment
- *   up_addrenv_assign  - Assign an address environment to a group
+ *   up_addrenv_clone   - Copy an address environment from one location to
+ *                        another.
  *
  * Higher-level interfaces used by the tasking logic.  These interfaces are
  * used by the functions in sched/ and all operate on the thread which whose
- * group been assigned an address environment by up_addrenv_assign().
+ * group been assigned an address environment by up_addrenv_clone().
  *
  *   up_addrenv_attach  - Clone the address environment assigned to one TCB
  *                        to another.  This operation is done when a pthread
@@ -661,30 +662,31 @@ int up_addrenv_restore(FAR const save_addrenv_t *oldenv)
 }
 
 /****************************************************************************
- * Name: up_addrenv_assign
+ * Name: up_addrenv_clone
  *
  * Description:
- *   Assign an address environment to a new task group.
+ *   Duplicate an address environment.  This does not copy the underlying
+ *   memory, only the representation that can be used to instantiate that
+ *   memory as an address environment.
  *
  * Input Parameters:
- *   addrenv - The representation of the task address environment previously
- *     returned by up_addrenv_create().
- *   group - The new task group to receive the address environment.
+ *   src - The address environment to be copied.
+ *   dest - The location to receive the copied address environment.
  *
  * Returned Value:
  *   Zero (OK) on success; a negated errno value on failure.
  *
  ****************************************************************************/
 
-int up_addrenv_assign(FAR const group_addrenv_t *addrenv,
-                      FAR struct task_group_s *group)
+int up_addrenv_clone(FAR const group_addrenv_t *src,
+                     FAR group_addrenv_t *dest)
 {
-  DEBUGASSERT(addrenv && group);
-  bvdbg("addrenv=%p group->addrenv=%p\n", addrenv, &group->addrenv);
+  bvdbg("src=%p dest=%p\n", src, dest);
+  DEBUGASSERT(src && dest);
 
-  /* Just copy the address environment into the group */
+  /* Just copy the address environment from the source to the destination */
 
-  memcpy(&group->addrenv, addrenv, sizeof(group_addrenv_t));
+  memcpy(dest, src, sizeof(group_addrenv_t));
   return OK;
 }
 
diff --git a/arch/z80/src/z180/z180_mmu.c b/arch/z80/src/z180/z180_mmu.c
index c86c57a62c..3aeb644688 100644
--- a/arch/z80/src/z180/z180_mmu.c
+++ b/arch/z80/src/z180/z180_mmu.c
@@ -192,11 +192,12 @@ return g_physhandle ? OK : -ENOMEM;
  *                        address environment
  *   up_addrenv_select  - Instantiate an address environment
  *   up_addrenv_restore - Restore an address environment
- *   up_addrenv_assign  - Assign an address environment to a group
+ *   up_addrenv_clone   - Copy an address environment from one location to
+ *                        another.
  *
  * Higher-level interfaces used by the tasking logic.  These interfaces are
  * used by the functions in sched/ and all operate on the thread which whose
- * group been assigned an address environment by up_addrenv_assign().
+ * group been assigned an address environment by up_addrenv_clone().
  *
  *   up_addrenv_attach   - Clone the address environment assigned to one TCB
  *                        to another.  This operation is done when a pthread
@@ -457,33 +458,32 @@ int up_addrenv_restore(FAR const save_addrenv_t *oldenv)
 }
 
 /****************************************************************************
- * Name: up_addrenv_assign
+ * Name: up_addrenv_clone
  *
  * Description:
- *   Assign an address environment to a task group.
+ *   Duplicate an address environment.  This does not copy the underlying
+ *   memory, only the representation that can be used to instantiate that
+ *   memory as an address environment.
  *
  * Input Parameters:
- *   addrenv - The representation of the task address environment previously
- *     returned by up_addrenv_create().
- *   group - The task group to receive the address environment.
+ *   src - The address environment to be copied.
+ *   dest - The location to receive the copied address environment.
  *
  * Returned Value:
  *   Zero (OK) on success; a negated errno value on failure.
  *
  ****************************************************************************/
 
-int up_addrenv_assign(FAR const group_addrenv_t *addrenv,
-                      FAR struct task_group_s *group)
+int up_addrenv_clone(FAR const group_addrenv_t *src,
+                     FAR group_addrenv_t *dest);
 {
-  /* Make sure that there is no address environment in place on this TCB */
+  DEBUGASSERT(src && dest);
 
-  DEBUGASSERT(addrenv && group->addrenv == NULL);
-
-  /* Save the CBR structure in the group.  This is an atomic operation so no
-   * special precautions should be needed.
+  /* Copy the CBR structure.  This is an atomic operation so no special
+   * precautions should be needed.
    */
 
-  group->addrenv = *addrenv;
+  *dest = *src;
   return OK;
 }
 
diff --git a/binfmt/binfmt_execmodule.c b/binfmt/binfmt_execmodule.c
index f415bccacb..5d49acf747 100644
--- a/binfmt/binfmt_execmodule.c
+++ b/binfmt/binfmt_execmodule.c
@@ -163,9 +163,9 @@ int exec_module(FAR const struct binary_s *binp)
       goto errout;
     }
 
+#ifndef CONFIG_CUSTOM_STACK
   /* Allocate the stack for the new task (always from the user heap) */
 
-#ifndef CONFIG_CUSTOM_STACK
   stack = (FAR uint32_t*)kumalloc(binp->stacksize);
   if (!tcb)
     {
@@ -193,11 +193,11 @@ int exec_module(FAR const struct binary_s *binp)
   /* Note that tcb->flags are not modified.  0=normal task */
   /* tcb->flags |= TCB_FLAG_TTYPE_TASK; */
 
+#ifdef CONFIG_PIC
   /* Add the D-Space address as the PIC base address.  By convention, this
    * must be the first allocated address space.
    */
 
-#ifdef CONFIG_PIC
   tcb->cmn.dspace = binp->alloc[0];
 
   /* Re-initialize the task's initial state to account for the new PIC base */
@@ -205,24 +205,24 @@ int exec_module(FAR const struct binary_s *binp)
   up_initial_state(&tcb->cmn);
 #endif
 
+#ifdef CONFIG_ARCH_ADDRENV
   /* Assign the address environment to the new task group */
 
-#ifdef CONFIG_ARCH_ADDRENV
-  ret = up_addrenv_assign(&binp->addrenv, tcb->cmn.group);
+  ret = up_addrenv_clone(&binp->addrenv, &tcb->cmn.group->addrenv);
   if (ret < 0)
     {
       err = -ret;
-      bdbg("ERROR: up_addrenv_assign() failed: %d\n", ret);
+      bdbg("ERROR: up_addrenv_clone() failed: %d\n", ret);
       goto errout_with_stack;
     }
 #endif
 
+#ifdef CONFIG_BINFMT_CONSTRUCTORS
   /* Setup a start hook that will execute all of the C++ static constructors
    * on the newly created thread.  The struct binary_s must persist at least
    * until the new task has been started.
    */
 
-#ifdef CONFIG_BINFMT_CONSTRUCTORS
   task_starthook(tcb, exec_ctors, (FAR void *)binp);
 #endif
 
@@ -261,4 +261,3 @@ errout:
 }
 
 #endif /* CONFIG_BINFMT_DISABLE */
-
diff --git a/binfmt/elf.c b/binfmt/elf.c
index 98924a6a8c..2cb18fe919 100644
--- a/binfmt/elf.c
+++ b/binfmt/elf.c
@@ -1,7 +1,7 @@
 /****************************************************************************
  * binfmt/elf.c
  *
- *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2012, 2014 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -294,11 +294,11 @@ static int elf_loadbinary(FAR struct binary_s *binp)
 #endif
 
 #ifdef CONFIG_ARCH_ADDRENV
-  /* Save the address environment.  This will be needed when the module is
-   * executed for the up_addrenv_assign() call.
+  /* Save the address environment in the binfmt structure.  This will be
+   * needed when the module is executed.
    */
 
-  binp->addrenv   = loadinfo.addrenv;
+  up_addrenv_clone(&loadinfo.addrenv, &binp->addrenv);
 #endif
 
   elf_dumpentrypt(binp, &loadinfo);
diff --git a/binfmt/nxflat.c b/binfmt/nxflat.c
index d225912e3f..a839bbc07c 100644
--- a/binfmt/nxflat.c
+++ b/binfmt/nxflat.c
@@ -206,11 +206,11 @@ static int nxflat_loadbinary(struct binary_s *binp)
 #endif
 
 #ifdef CONFIG_ARCH_ADDRENV
-  /* Save the address environment.  This will be needed when the module is
-   * executed for the up_addrenv_assign() call.
+  /* Save the address environment in the binfmt structure.  This will be
+   * needed when the module is executed.
    */
 
-  binp->addrenv   = loadinfo.addrenv;
+  up_addrenv_clone(&loadinfo.addrenv, &binp->addrenv);
 #endif
 
   nxflat_dumpbuffer("Entry code", (FAR const uint8_t*)binp->entrypt,
diff --git a/include/nuttx/addrenv.h b/include/nuttx/addrenv.h
index 44c414f42c..51bd794918 100644
--- a/include/nuttx/addrenv.h
+++ b/include/nuttx/addrenv.h
@@ -162,11 +162,12 @@
  *                        address environment
  *   up_addrenv_select  - Instantiate an address environment
  *   up_addrenv_restore - Restore an address environment
- *   up_addrenv_assign  - Assign an address environment to a group
+ *   up_addrenv_clone   - Copy an address environment from one location to
+ *                        another.
  *
  * Higher-level interfaces used by the tasking logic.  These interfaces are
  * used by the functions in sched/ and all operate on the thread which whose
- * group been assigned an address environment by up_addrenv_assign().
+ * group been assigned an address environment by up_addrenv_clone().
  *
  *   up_addrenv_attach  - Clone the address environment assigned to one TCB
  *                        to another.  This operation is done when a pthread
diff --git a/include/nuttx/arch.h b/include/nuttx/arch.h
index 34ec4730e3..483ee8e94d 100644
--- a/include/nuttx/arch.h
+++ b/include/nuttx/arch.h
@@ -696,11 +696,12 @@ void up_allocate_pgheap(FAR void **heap_start, size_t *heap_size);
  *                        address environment
  *   up_addrenv_select  - Instantiate an address environment
  *   up_addrenv_restore - Restore an address environment
- *   up_addrenv_assign  - Assign an address environment to a group
+ *   up_addrenv_clone   - Copy an address environment from one location to
+ *                        another.
  *
  * Higher-level interfaces used by the tasking logic.  These interfaces are
  * used by the functions in sched/ and all operate on the thread which whose
- * group been assigned an address environment by up_addrenv_assign().
+ * group been assigned an address environment by up_addrenv_clone().
  *
  *   up_addrenv_attach  - Clone the address environment assigned to one TCB
  *                        to another.  This operation is done when a pthread
@@ -858,15 +859,16 @@ int up_addrenv_restore(FAR const save_addrenv_t *oldenv);
 #endif
 
 /****************************************************************************
- * Name: up_addrenv_assign
+ * Name: up_addrenv_clone
  *
  * Description:
- *   Assign an address environment to a new task group.
+ *   Duplicate an address environment.  This does not copy the underlying
+ *   memory, only the representation that can be used to instantiate that
+ *   memory as an address environment.
  *
  * Input Parameters:
- *   addrenv - The representation of the task address environment previously
- *     returned by up_addrenv_create().
- *   group - The new task group to receive the address environment.
+ *   src - The address environment to be copied.
+ *   dest - The location to receive the copied address environment.
  *
  * Returned Value:
  *   Zero (OK) on success; a negated errno value on failure.
@@ -874,8 +876,8 @@ int up_addrenv_restore(FAR const save_addrenv_t *oldenv);
  ****************************************************************************/
 
 #ifdef CONFIG_ARCH_ADDRENV
-int up_addrenv_assign(FAR const group_addrenv_t *addrenv,
-                      FAR struct task_group_s *group);
+int up_addrenv_clone(FAR const group_addrenv_t *src,
+                     FAR group_addrenv_t *dest);
 #endif
 
 /****************************************************************************