_kernel_unwind now understands SFMFD instructions in function entry.

It also copes with STFE now - it was totally broken.
32-bit stubs and corresponding LibInit SWIs created.
All rather untested.

Version 4.97, 4.12.2.3. Tagged as 'RISC_OSLib-4_97-4_12_2_3'

s/h_StrongA

-; Copyright 1996 Acorn Computers Ltd
-;
-; Licensed under the Apache License, Version 2.0 (the "License");
-; you may not use this file except in compliance with the License.
-; You may obtain a copy of the License at
-;
-;     http://www.apache.org/licenses/LICENSE-2.0
-;
-; Unless required by applicable law or agreed to in writing, software
-; distributed under the License is distributed on an "AS IS" BASIS,
-; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-; See the License for the specific language governing permissions and
-; limitations under the License.
-;
-
-	GET	Hdr:ListOpts
-	GET	Hdr:Machine.<Machine>
-	GET	Hdr:CPU.Generic26
-	GET	Hdr:Macros
-	GET	Hdr:SWIs
-	GET	Hdr:RISCOS
-
-        GBLL    StrongARM
-	GBLL	SASTMhatbroken
-
-StrongARM	SETL :DEF: AMBKernel
-SASTMhatbroken	SETL {TRUE} :LAND: StrongARM
-
-  [ StrongARM
-        ;macro to synchronise to $Ncodewords words of code on (FD) stack
-        MACRO
-        SyncStackCode $Ncodewords
-        STMFD  sp!,{r0-r2,lr}
-        MOV    r0,#1                    ;means range specified in r1,r2
-        ADD    r1,sp,#4*4               ;start address (allowing for stacked r0-r2,lr)
-        ADD    r2,r1,#($Ncodewords-1)*4 ;end address (inclusive) for $Ncodewords words of code
-        SWI    XOS_SynchroniseCodeAreas ;do the necessary
-        LDMFD  sp!,{r0-r2,lr}
-        MEND
-  ]
-
-        END