Update checkhandle to check that window pointers are word aligned

Detail:
  s/Wimp04 - The checkhandle* routines now checks that the window pointer is word aligned before attempting to load any data from it.
  This prevents alignment faults on ARMv6+, and should result in more accurate sanity checks in general.
Admin:
  Tested on rev C2 beagleboard.
  Fixes issue reported on forums:
  http://www.riscosopen.org/forum/forums/5/topics/517


Version 5.10. Tagged as 'Wimp-5_10'

VersionASM

@@ -11,13 +11,13 @@
                         GBLS    Module_HelpVersion
                         GBLS    Module_ComponentName
                         GBLS    Module_ComponentPath
-Module_MajorVersion     SETS    "5.09"
-Module_Version          SETA    509
+Module_MajorVersion     SETS    "5.10"
+Module_Version          SETA    510
 Module_MinorVersion     SETS    ""
-Module_Date             SETS    "26 Nov 2010"
-Module_ApplicationDate  SETS    "26-Nov-10"
+Module_Date             SETS    "04 Dec 2010"
+Module_ApplicationDate  SETS    "04-Dec-10"
 Module_ComponentName    SETS    "Wimp"
 Module_ComponentPath    SETS    "castle/RiscOS/Sources/Desktop/Wimp"
-Module_FullVersion      SETS    "5.09"
-Module_HelpVersion      SETS    "5.09 (26 Nov 2010)"
+Module_FullVersion      SETS    "5.10"
+Module_HelpVersion      SETS    "5.10 (04 Dec 2010)"
                         END

VersionNum

-/* (5.09)
+/* (5.10)
  *
  * This file is automatically maintained by srccommit, do not edit manually.
  * Last processed by srccommit version: 1.1.
  *
  */
-#define Module_MajorVersion_CMHG        5.09
+#define Module_MajorVersion_CMHG        5.10
 #define Module_MinorVersion_CMHG        
-#define Module_Date_CMHG                26 Nov 2010
+#define Module_Date_CMHG                04 Dec 2010
 
-#define Module_MajorVersion             "5.09"
-#define Module_Version                  509
+#define Module_MajorVersion             "5.10"
+#define Module_Version                  510
 #define Module_MinorVersion             ""
-#define Module_Date                     "26 Nov 2010"
+#define Module_Date                     "04 Dec 2010"
 
-#define Module_ApplicationDate          "26-Nov-10"
+#define Module_ApplicationDate          "04-Dec-10"
 
 #define Module_ComponentName            "Wimp"
 #define Module_ComponentPath            "castle/RiscOS/Sources/Desktop/Wimp"
 
-#define Module_FullVersion              "5.09"
-#define Module_HelpVersion              "5.09 (26 Nov 2010)"
-#define Module_LibraryVersionInfo       "5:9"
+#define Module_FullVersion              "5.10"
+#define Module_HelpVersion              "5.10 (04 Dec 2010)"
+#define Module_LibraryVersionInfo       "5:10"

s/Wimp04

@@ -5825,6 +5825,8 @@ checkhandle
 ; Check the window structure for being inside valid memory
 ;
         Abs     handle,handle
+        TST     handle,#3
+        BNE     errhandle ; If it's not word aligned, it's definitely invalid
         MOV     R0,handle
         ADD     R1,R0,#w_size
         Debug   valid,"WIMP validating: ",r0,r1