Fix wildly inaccurate sizes in PhysRamTable when split_block needed

When Subtractv1v2fromRAMtable is called to remove a region that results in one of the RAM blocks being split in the middle the resulting size was incorrect.
The shuffle up loop was reusing v6 as an iterator not realising that it's needed to calculate the size of the 2nd half later, the error introduced was the difference between the physical address where PhysRamTable is located and the block being split - these could be a long way apart for example when there are two SDRAM banks.
Even if the PhysRamTable is nearby (eg. 1 SDRAM bank) the result would be some weird sized entries which ultimately mean some dynamic area address space is "leaked".

Fixed by swapping to v7, and for symmetry also adjusted the shuffle down loop to match.

Version 5.35, 4.79.2.224. Tagged as 'Kernel-5_35-4_79_2_224'

VersionASM

@@ -13,11 +13,11 @@
                         GBLS    Module_ComponentPath
 Module_MajorVersion     SETS    "5.35"
 Module_Version          SETA    535
-Module_MinorVersion     SETS    "4.79.2.223"
-Module_Date             SETS    "20 Apr 2014"
-Module_ApplicationDate  SETS    "20-Apr-14"
+Module_MinorVersion     SETS    "4.79.2.224"
+Module_Date             SETS    "30 Apr 2014"
+Module_ApplicationDate  SETS    "30-Apr-14"
 Module_ComponentName    SETS    "Kernel"
 Module_ComponentPath    SETS    "castle/RiscOS/Sources/Kernel"
-Module_FullVersion      SETS    "5.35 (4.79.2.223)"
-Module_HelpVersion      SETS    "5.35 (20 Apr 2014) 4.79.2.223"
+Module_FullVersion      SETS    "5.35 (4.79.2.224)"
+Module_HelpVersion      SETS    "5.35 (30 Apr 2014) 4.79.2.224"
                         END

VersionNum

@@ -5,19 +5,19 @@
  *
  */
 #define Module_MajorVersion_CMHG        5.35
-#define Module_MinorVersion_CMHG        4.79.2.223
-#define Module_Date_CMHG                20 Apr 2014
+#define Module_MinorVersion_CMHG        4.79.2.224
+#define Module_Date_CMHG                30 Apr 2014
 
 #define Module_MajorVersion             "5.35"
 #define Module_Version                  535
-#define Module_MinorVersion             "4.79.2.223"
-#define Module_Date                     "20 Apr 2014"
+#define Module_MinorVersion             "4.79.2.224"
+#define Module_Date                     "30 Apr 2014"
 
-#define Module_ApplicationDate          "20-Apr-14"
+#define Module_ApplicationDate          "30-Apr-14"
 
 #define Module_ComponentName            "Kernel"
 #define Module_ComponentPath            "castle/RiscOS/Sources/Kernel"
 
-#define Module_FullVersion              "5.35 (4.79.2.223)"
-#define Module_HelpVersion              "5.35 (20 Apr 2014) 4.79.2.223"
+#define Module_FullVersion              "5.35 (4.79.2.224)"
+#define Module_HelpVersion              "5.35 (30 Apr 2014) 4.79.2.224"
 #define Module_LibraryVersionInfo       "5:35"

s/HAL

@@ -282,12 +282,12 @@ Subtractv1v2fromRAMtable
 
         ; we've completely covered a block. Remove it.
 remove_block
-        MOV     v6, v8
-20      TEQ     v6, a4                  ; shuffle down subsequent blocks in table
-        LDMNEIA v6, {v3, v4}
-        STMNEDB v6, {v3, v4}
-        ADDNE   v6, v6, #8
-        BNE     %20
+        MOV     v7, v8
+20      TEQ     v7, a4                  ; shuffle down subsequent blocks in table
+        LDMNEIA v7, {v3, v4}
+        STMNEDB v7, {v3, v4}
+        ADDNE   v7, v7, #8
+        BNE     %BT20
         SUB     v5, v5, #1
         SUB     a4, a4, #8
         STR     v5, [a4]
@@ -306,11 +306,11 @@ not_bottom
         B       %BT10
 
 split_block
-        MOV     v6, a4
-30      TEQ     v6, v8                  ; shuffle up subsequent blocks in table
-        LDMNEDB v6, {v3, v4}
-        STMNEIA v6, {v3, v4}
-        SUBNE   v6, v6, #8
+        MOV     v7, a4
+30      TEQ     v7, v8                  ; shuffle up subsequent blocks in table
+        LDMNEDB v7, {v3, v4}
+        STMNEIA v7, {v3, v4}
+        SUBNE   v7, v7, #8
         BNE     %BT30
         ADD     v5, v5, #1
         ADD     a4, a4, #8