bsps: Support .rtemsstack.* linker input sections

Use a dedicated memory region or place it between the BSS and workspace.

Update #3459.

bsps/mips/csb350/start/linkcmds

@@ -194,11 +194,12 @@ SECTIONS
     _clear_end = .;
     end = .;
     _end = .;
-    . = ALIGN (1024);
-    WorkAreaBase = .;
-    
-  } >ram   
+  } >ram
 
+  .rtemsstack (NOLOAD) : {
+    *(SORT(.rtemsstack.*))
+    WorkAreaBase = .;
+  } >ram
 
 /* 
 ** DWARF debug sections.

bsps/mips/hurricane/start/linkcmds

@@ -172,9 +172,12 @@ SECTIONS
     _stack_init = .;
      end = .;
     _end = .;
-    WorkAreaBase = .;
   }
 
+  .rtemsstack (NOLOAD) : {
+    *(SORT(.rtemsstack.*))
+    WorkAreaBase = .;
+  }
 
   /* Debug sections.  These should never be loadable, but they must have
      zero addresses for the debuggers to work correctly.  */

bsps/mips/jmr3904/start/linkcmds

@@ -168,9 +168,14 @@ SECTIONS
     . += _StackSize;
     __stack = .;
     _stack_init = .;
-    WorkAreaBase = .;
     _clear_end = .;
   }
+
+  .rtemsstack (NOLOAD) : {
+    *(SORT(.rtemsstack.*))
+    WorkAreaBase = .;
+  }
+
   . = 0x88400000; /* reserve some memory for Work Area */
  end = .;
  _end = .;

bsps/mips/malta/start/linkcmds

@@ -169,9 +169,14 @@ SECTIONS
     . += _StackSize;
     __stack = .;
     _stack_init = .;
-    WorkAreaBase = .;
     _clear_end = .;
   }
+
+  .rtemsstack (NOLOAD) : {
+    *(SORT(.rtemsstack.*))
+    WorkAreaBase = .;
+  }
+
   . = 0x88400000; /* reserve some memory for Work Area */
  end = .;
  _end = .;

bsps/mips/rbtx4925/start/linkcmds

@@ -172,9 +172,12 @@ SECTIONS
     _stack_init = .;
      end = .;
     _end = .;
-    WorkAreaBase = .;
   }
 
+  .rtemsstack (NOLOAD) : {
+    *(SORT(.rtemsstack.*))
+    WorkAreaBase = .;
+  }
 
   /* Debug sections.  These should never be loadable, but they must have
      zero addresses for the debuggers to work correctly.  */

bsps/mips/rbtx4938/start/linkcmds

@@ -172,9 +172,12 @@ SECTIONS
     _stack_init = .;
      end = .;
     _end = .;
-    WorkAreaBase = .;
   }
 
+  .rtemsstack (NOLOAD) : {
+    *(SORT(.rtemsstack.*))
+    WorkAreaBase = .;
+  }
 
   /* Debug sections.  These should never be loadable, but they must have
      zero addresses for the debuggers to work correctly.  */