Change to calling conditions of UnthreadV.

Detail:
  Previously, UnthreadV was only called when the IRQsema chain was empty, the
  link for the just-completed interrupt having just been removed. However,
  the information in the link is necessary to allow OS_Heap to be called from
  UnthreadV context, and patching up IRQsema within the UnthreadV handler
  prevents the implementation of a prioritised threading scheme. As a result,
  we must call UnthreadV every time the interrupt dispatch unthreads, and
  leave it up to the UnthreadV handler to distinguish between return to
  thread context and return from a nested interrupt handler.
Admin:
  Will require some sort of patch to enable heap-safe prioritised threading
  on RISC OS-STB 5.0.0 or RISC OS 5.07, the only two released OSes with the
  previous UnthreadV behaviour.

Version 5.35, 4.79.2.77. Tagged as 'Kernel-5_35-4_79_2_77'

VersionASM

 ;
 ; This file is automatically maintained by srccommit, do not edit manually.
-; Last processed by srccommit version: 1.68.
+; Last processed by srccommit version: 1.2.
 ;
                         GBLS    Module_MajorVersion
                         GBLA    Module_Version
@@ -13,11 +13,11 @@
                         GBLS    Module_ComponentPath
 Module_MajorVersion     SETS    "5.35"
 Module_Version          SETA    535
-Module_MinorVersion     SETS    "4.79.2.76"
-Module_Date             SETS    "08 Sep 2004"
-Module_ApplicationDate  SETS    "08-Sep-04"
+Module_MinorVersion     SETS    "4.79.2.77"
+Module_Date             SETS    "06 Oct 2004"
+Module_ApplicationDate  SETS    "06-Oct-04"
 Module_ComponentName    SETS    "Kernel"
 Module_ComponentPath    SETS    "RiscOS/Sources/Kernel"
-Module_FullVersion      SETS    "5.35 (4.79.2.76)"
-Module_HelpVersion      SETS    "5.35 (08 Sep 2004) 4.79.2.76"
+Module_FullVersion      SETS    "5.35 (4.79.2.77)"
+Module_HelpVersion      SETS    "5.35 (06 Oct 2004) 4.79.2.77"
                         END

VersionNum

 /* (5.35)
  *
  * This file is automatically maintained by srccommit, do not edit manually.
- * Last processed by srccommit version: 1.68.
+ * Last processed by srccommit version: 1.2.
  *
  */
 #define Module_MajorVersion_CMHG        5.35
-#define Module_MinorVersion_CMHG        4.79.2.76
-#define Module_Date_CMHG                08 Sep 2004
+#define Module_MinorVersion_CMHG        4.79.2.77
+#define Module_Date_CMHG                06 Oct 2004
 
 #define Module_MajorVersion             "5.35"
 #define Module_Version                  535
-#define Module_MinorVersion             "4.79.2.76"
-#define Module_Date                     "08 Sep 2004"
+#define Module_MinorVersion             "4.79.2.77"
+#define Module_Date                     "06 Oct 2004"
 
-#define Module_ApplicationDate          "08-Sep-04"
+#define Module_ApplicationDate          "06-Oct-04"
 
 #define Module_ComponentName            "Kernel"
 #define Module_ComponentPath            "RiscOS/Sources/Kernel"
 
-#define Module_FullVersion              "5.35 (4.79.2.76)"
-#define Module_HelpVersion              "5.35 (08 Sep 2004) 4.79.2.76"
+#define Module_FullVersion              "5.35 (4.79.2.77)"
+#define Module_HelpVersion              "5.35 (06 Oct 2004) 4.79.2.77"
 #define Module_LibraryVersionInfo       "5:35"

s/NewIRQs

@@ -59,17 +59,14 @@ Initial_IRQ_Code ROUT
 ;  BNE somebodysonIRQ1V
 ;  .... fall into default IRQ1V code
 
-        MOV      r11, #0
-        Pull     r0
-        STR      r0, [r11, #IRQsema]
-
-        TEQ      r0, #0
-        BNE      %F10
         Push     "r10"
         MOV      r10, #UnthreadV
         BL       CallVector
         Pull     "r10"
-10
+
+        MOV      r11, #0
+        Pull     r0
+        STR      r0, [r11, #IRQsema]
 
   [ :LNOT:No26bitCode
         MRS      r0, CPSR