Make abort handling more robust

Detail:
  kernel/s/k_body - Update AbortFindHandler to check that SP & SL are both word aligned, especially because the code will attempt to load from SL to check for the stack chunk magic marker.
Admin:
  Tested on BB-xM
  Avoids some "abort while in abort handler" type scenarios if an abort occurs while SP/SL are invalid


Version 5.95. Tagged as 'RISC_OSLib-5_95'

VersionASM

@@ -11,13 +11,13 @@
                         GBLS    Module_HelpVersion
                         GBLS    Module_ComponentName
                         GBLS    Module_ComponentPath
-Module_MajorVersion     SETS    "5.94"
-Module_Version          SETA    594
+Module_MajorVersion     SETS    "5.95"
+Module_Version          SETA    595
 Module_MinorVersion     SETS    ""
-Module_Date             SETS    "29 Oct 2017"
-Module_ApplicationDate  SETS    "29-Oct-17"
+Module_Date             SETS    "14 Apr 2018"
+Module_ApplicationDate  SETS    "14-Apr-18"
 Module_ComponentName    SETS    "RISC_OSLib"
 Module_ComponentPath    SETS    "castle/RiscOS/Sources/Lib/RISC_OSLib"
-Module_FullVersion      SETS    "5.94"
-Module_HelpVersion      SETS    "5.94 (29 Oct 2017)"
+Module_FullVersion      SETS    "5.95"
+Module_HelpVersion      SETS    "5.95 (14 Apr 2018)"
                         END

VersionNum

-/* (5.94)
+/* (5.95)
  *
  * This file is automatically maintained by srccommit, do not edit manually.
  * Last processed by srccommit version: 1.1.
  *
  */
-#define Module_MajorVersion_CMHG        5.94
+#define Module_MajorVersion_CMHG        5.95
 #define Module_MinorVersion_CMHG        
-#define Module_Date_CMHG                29 Oct 2017
+#define Module_Date_CMHG                14 Apr 2018
 
-#define Module_MajorVersion             "5.94"
-#define Module_Version                  594
+#define Module_MajorVersion             "5.95"
+#define Module_Version                  595
 #define Module_MinorVersion             ""
-#define Module_Date                     "29 Oct 2017"
+#define Module_Date                     "14 Apr 2018"
 
-#define Module_ApplicationDate          "29-Oct-17"
+#define Module_ApplicationDate          "14-Apr-18"
 
 #define Module_ComponentName            "RISC_OSLib"
 #define Module_ComponentPath            "castle/RiscOS/Sources/Lib/RISC_OSLib"
 
-#define Module_FullVersion              "5.94"
-#define Module_HelpVersion              "5.94 (29 Oct 2017)"
-#define Module_LibraryVersionInfo       "5:94"
+#define Module_FullVersion              "5.95"
+#define Module_HelpVersion              "5.95 (14 Apr 2018)"
+#define Module_LibraryVersionInfo       "5:95"

kernel/s/k_body

@@ -1072,6 +1072,11 @@ AbortFindHandler Keep
         LDR     r2, [v6, #O_heapLimit]
 
         LDR     r12, [v6, #O_registerDump+sp*4]
+        ; Stack pointer and stack limit must both be word aligned
+        ; Frame pointer might not be (bottom bit used as flag), so don't check for that (_kernel_unwind will check it before using it anyway)
+        TST     r10, #3
+        TSTEQ   r12, #3
+        BNE     Trap_NoStackForHandler
         CMP     r12, r1
         CMPHI   r2, r12
         ADDHI   r1, r12, #256