Clean up ARM toolchain heap+stack setup in targets

ARM Compiler 6.13 testing revealed linker errors pointing out
conflicting use of `__user_setup_stackheap` and
`__user_initial_stackheap` in some targets. Remove the unwanted
`__user_initial_stackheap` from the targets - the setup is
centralised in the common platform code.

Looking into this, a number of other issues were highlighted

* Almost all targets had `__initial_sp` hardcoded in assembler,
  rather than getting it from the scatter file. This was behind
  issue #11313. Fix this generally.
* A few targets' `__initial_sp` values did not match the scatter
  file layout, in some cases meaning they were overlapping heap
  space. They now all use the area reserved in the scatter file.
  If any problems are seen, then there is an error in the
  scatter file.
* A number of targets were reserving unneeded space for heap and
  stack in their startup assembler, on top of the space reserved in
  the scatter file, so wasting a few K. A couple were using that
  space for the stack, rather than the space in the scatter file.

To clarify expected behaviour:

* Each scatter file contains empty regions `ARM_LIB_HEAP` and
  `ARM_LIB_STACK` to reserve space. `ARM_LIB_STACK` is sized
  by the macro `MBED_BOOT_STACK_SIZE`, which is set by the tools.
  `ARM_LIB_HEAP` is generally the space left over after static
  RAM and stack.
* The address of the end of `ARM_LIB_STACK` is written into the
  vector table and on reset the CPU sets MSP to that address.
* The common platform code in Mbed OS provides `__user_setup_stackheap`
  for the ARM library. The ARM library calls this during startup, and
  it calls `__mbed_user_setup_stackheap`.
* The default weak definition of `__mbed_user_setup_stackheap` does not
  modify SP, so we remain on the boot stack, and the heap is set to
  the region described by `ARM_LIB_HEAP`. If `ARM_LIB_HEAP` doesn't
  exist, then the heap is the space from the end of the used data in
  `RW_IRAM1` to the start of `ARM_LIB_STACK`.
* Targets can override `__mbed_user_setup_stackheap` if they want.
  Currently only Renesas (ARMv7-A class) devices do.
* If microlib is in use, then it doesn't call `__user_setup_stackheap`.
  Instead it just finds and uses `ARM_LIB_STACK` and `ARM_LIB_HEAP`
  itself.

Author: kjbracey

targets/TARGET_ARM_FM/TARGET_FVP_MPS2/TARGET_FVP_MPS2_M0/device/TOOLCHAIN_ARM_STD/startup_MPS2.S

@@ -35,10 +35,6 @@
 ;
 ;******************************************************************************
 
-#include "../memory_zones.h"
-
-__initial_sp    EQU     ZBT_SRAM2_START + ZBT_SRAM2_SIZE
-
                 PRESERVE8
                 THUMB
 
@@ -48,8 +44,9 @@ __initial_sp    EQU     ZBT_SRAM2_START + ZBT_SRAM2_SIZE
                 EXPORT  __Vectors
                 EXPORT  __Vectors_End
                 EXPORT  __Vectors_Size
+                IMPORT  |Image$$ARM_LIB_STACK$$ZI$$Limit|
 
-__Vectors       DCD     __initial_sp              ; Top of Stack
+__Vectors       DCD     |Image$$ARM_LIB_STACK$$ZI$$Limit| ; Top of Stack
                 DCD     Reset_Handler             ; Reset Handler
                 DCD     NMI_Handler               ; NMI Handler
                 DCD     HardFault_Handler         ; Hard Fault Handler

targets/TARGET_ARM_FM/TARGET_FVP_MPS2/TARGET_FVP_MPS2_M0P/device/TOOLCHAIN_ARM_STD/startup_MPS2.S

@@ -35,10 +35,6 @@
 ;
 ;******************************************************************************
 
-#include "../memory_zones.h"
-
-__initial_sp    EQU     ZBT_SRAM2_START + ZBT_SRAM2_SIZE
-
                 PRESERVE8
                 THUMB
 
@@ -48,8 +44,9 @@ __initial_sp    EQU     ZBT_SRAM2_START + ZBT_SRAM2_SIZE
                 EXPORT  __Vectors
                 EXPORT  __Vectors_End
                 EXPORT  __Vectors_Size
+                IMPORT  |Image$$ARM_LIB_STACK$$ZI$$Limit|
 
-__Vectors       DCD     __initial_sp              ; Top of Stack
+__Vectors       DCD     |Image$$ARM_LIB_STACK$$ZI$$Limit| ; Top of Stack
                 DCD     Reset_Handler             ; Reset Handler
                 DCD     NMI_Handler               ; NMI Handler
                 DCD     HardFault_Handler         ; Hard Fault Handler

targets/TARGET_ARM_FM/TARGET_FVP_MPS2/TARGET_FVP_MPS2_M3/device/TOOLCHAIN_ARM_STD/startup_MPS2.S

@@ -35,10 +35,6 @@
 ;
 ;******************************************************************************
 
-#include "../memory_zones.h"
-
-__initial_sp    EQU     ZBT_SRAM2_START + ZBT_SRAM2_SIZE
-
                 PRESERVE8
                 THUMB
 
@@ -48,8 +44,9 @@ __initial_sp    EQU     ZBT_SRAM2_START + ZBT_SRAM2_SIZE
                 EXPORT  __Vectors
                 EXPORT  __Vectors_End
                 EXPORT  __Vectors_Size
+                IMPORT  |Image$$ARM_LIB_STACK$$ZI$$Limit|
 
-__Vectors       DCD     __initial_sp              ; Top of Stack
+__Vectors       DCD     |Image$$ARM_LIB_STACK$$ZI$$Limit| ; Top of Stack
                 DCD     Reset_Handler             ; Reset Handler
                 DCD     NMI_Handler               ; NMI Handler
                 DCD     HardFault_Handler         ; Hard Fault Handler

targets/TARGET_ARM_FM/TARGET_FVP_MPS2/TARGET_FVP_MPS2_M4/device/TOOLCHAIN_ARM_STD/startup_MPS2.S

@@ -35,10 +35,6 @@
 ;
 ;******************************************************************************
 
-#include "../memory_zones.h"
-
-__initial_sp    EQU     ZBT_SRAM2_START + ZBT_SRAM2_SIZE
-
                 PRESERVE8
                 THUMB
 
@@ -48,8 +44,9 @@ __initial_sp    EQU     ZBT_SRAM2_START + ZBT_SRAM2_SIZE
                 EXPORT  __Vectors
                 EXPORT  __Vectors_End
                 EXPORT  __Vectors_Size
+                IMPORT  |Image$$ARM_LIB_STACK$$ZI$$Limit|
 
-__Vectors       DCD     __initial_sp              ; Top of Stack
+__Vectors       DCD     |Image$$ARM_LIB_STACK$$ZI$$Limit| ; Top of Stack
                 DCD     Reset_Handler             ; Reset Handler
                 DCD     NMI_Handler               ; NMI Handler
                 DCD     HardFault_Handler         ; Hard Fault Handler

targets/TARGET_ARM_FM/TARGET_FVP_MPS2/TARGET_FVP_MPS2_M7/device/TOOLCHAIN_ARM_STD/startup_CMSDK_CM7.S

@@ -35,10 +35,6 @@
 ;
 ;******************************************************************************
 
-#include "../memory_zones.h"
-
-__initial_sp    EQU     ZBT_SRAM2_START + ZBT_SRAM2_SIZE
-
                 PRESERVE8
                 THUMB
 
@@ -48,8 +44,9 @@ __initial_sp    EQU     ZBT_SRAM2_START + ZBT_SRAM2_SIZE
                 EXPORT  __Vectors
                 EXPORT  __Vectors_End
                 EXPORT  __Vectors_Size
+                IMPORT  |Image$$ARM_LIB_STACK$$ZI$$Limit|
 
-__Vectors       DCD     __initial_sp              ; Top of Stack
+__Vectors       DCD     |Image$$ARM_LIB_STACK$$ZI$$Limit| ; Top of Stack
                 DCD     Reset_Handler             ; Reset Handler
                 DCD     NMI_Handler               ; NMI Handler
                 DCD     HardFault_Handler         ; Hard Fault Handler

targets/TARGET_ARM_SSG/TARGET_CM3DS_MPS2/device/TOOLCHAIN_ARM_STD/startup_MPS2.S

@@ -22,10 +22,6 @@
  * This file is derivative of CMSIS V5.00 startup_ARMCM3.s
  */
 
-#include "../memory_zones.h"
-
-__initial_sp    EQU     ZBT_SSRAM23_START + ZBT_SSRAM23_SIZE ; Top of ZBT SSRAM2 and 3, used for data
-
                 PRESERVE8
                 THUMB
 
@@ -36,8 +32,9 @@ __initial_sp    EQU     ZBT_SSRAM23_START + ZBT_SSRAM23_SIZE ; Top of ZBT SSRAM2
                 EXPORT  __Vectors
                 EXPORT  __Vectors_End
                 EXPORT  __Vectors_Size
+                IMPORT  |Image$$ARM_LIB_STACK$$ZI$$Limit|
 
-__Vectors       DCD     __initial_sp              ; Top of Stack
+__Vectors       DCD     |Image$$ARM_LIB_STACK$$ZI$$Limit| ; Top of Stack
                 DCD     Reset_Handler             ; Reset Handler
                 DCD     NMI_Handler               ; NMI Handler
                 DCD     HardFault_Handler         ; Hard Fault Handler

targets/TARGET_ARM_SSG/TARGET_IOTSS/TARGET_IOTSS_BEID/device/TOOLCHAIN_ARM_STD/startup_MPS2.S

@@ -34,32 +34,6 @@
 ;           CMSDK_BEID Device
 ;
 ;******************************************************************************
-;
-;-------- <<< Use Configuration Wizard in Context Menu >>> ------------------
-;
-
-
-; <h> Stack Configuration
-;   <o> Stack Size (in Bytes) <0x0-0xFFFFFFFF:8>
-; </h>
-
-Stack_Size      EQU     0x00004000
-
-                AREA    STACK, NOINIT, READWRITE, ALIGN=3
-Stack_Mem       SPACE   Stack_Size
-__initial_sp
-
-
-; <h> Heap Configuration
-;   <o>  Heap Size (in Bytes) <0x0-0xFFFFFFFF:8>
-; </h>
-
-Heap_Size       EQU     0x00001000
-
-                AREA    HEAP, NOINIT, READWRITE, ALIGN=3
-__heap_base
-Heap_Mem        SPACE   Heap_Size
-__heap_limit
 
 
                 PRESERVE8
@@ -72,8 +46,9 @@ __heap_limit
                 EXPORT  __Vectors
                 EXPORT  __Vectors_End
                 EXPORT  __Vectors_Size
+                IMPORT  |Image$$ARM_LIB_STACK$$ZI$$Limit|
 
-__Vectors       DCD     __initial_sp              ; Top of Stack
+__Vectors       DCD     |Image$$ARM_LIB_STACK$$ZI$$Limit| ; Top of Stack
                 DCD     Reset_Handler             ; Reset Handler
                 DCD     NMI_Handler               ; NMI Handler
                 DCD     HardFault_Handler         ; Hard Fault Handler
@@ -329,30 +304,4 @@ MPS2_SPI4_IRQHandler
                 ALIGN
 
 
-; User Initial Stack & Heap
-
-                IF      :DEF:__MICROLIB
-
-                EXPORT  __initial_sp
-                EXPORT  __heap_base
-                EXPORT  __heap_limit
-
-                ELSE
-
-                IMPORT  __use_two_region_memory
-                EXPORT  __user_initial_stackheap
-
-__user_initial_stackheap PROC
-                LDR     R0, =  Heap_Mem
-                LDR     R1, =(Stack_Mem + Stack_Size)
-                LDR     R2, = (Heap_Mem +  Heap_Size)
-                LDR     R3, = Stack_Mem
-                BX      LR
-                ENDP
-
-                ALIGN
-
-                ENDIF
-
-
                 END

targets/TARGET_ARM_SSG/TARGET_MPS2/TARGET_MPS2_M0/device/TOOLCHAIN_ARM_STD/startup_MPS2.S

@@ -34,31 +34,6 @@
 ;           CMSDK_CM0 Device
 ;
 ;******************************************************************************
-;
-;-------- <<< Use Configuration Wizard in Context Menu >>> ------------------
-;
-
-; <h> Heap Configuration
-;   <o>  Heap Size (in Bytes) <0x0-0xFFFFFFFF:8>
-; </h>
-
-Heap_Size       EQU     0x00000400
-
-                AREA    HEAP, NOINIT, READWRITE, ALIGN=3
-__heap_base
-Heap_Mem        SPACE   Heap_Size
-__heap_limit
-
-; <h> Stack Configuration
-;   <o> Stack Size (in Bytes) <0x0-0xFFFFFFFF:8>
-; </h>
-
-Stack_Size      EQU     0x00001000
-
-                AREA    STACK, NOINIT, READWRITE, ALIGN=3
-Stack_Mem       SPACE   Stack_Size
-
-__initial_sp    EQU     0x20400000
 
                 PRESERVE8
                 THUMB
@@ -70,8 +45,9 @@ __initial_sp    EQU     0x20400000
                 EXPORT  __Vectors
                 EXPORT  __Vectors_End
                 EXPORT  __Vectors_Size
+                IMPORT  |Image$$ARM_LIB_STACK$$ZI$$Limit|
 
-__Vectors       DCD     __initial_sp              ; Top of Stack
+__Vectors       DCD     |Image$$ARM_LIB_STACK$$ZI$$Limit| ; Top of Stack
                 DCD     Reset_Handler             ; Reset Handler
                 DCD     NMI_Handler               ; NMI Handler
                 DCD     HardFault_Handler         ; Hard Fault Handler
@@ -239,30 +215,4 @@ PORT0_7_Handler
                 ALIGN
 
 
-; User Initial Stack & Heap
-
-                IF      :DEF:__MICROLIB
-
-                EXPORT  __initial_sp
-                EXPORT  __heap_base
-                EXPORT  __heap_limit
-
-                ELSE
-
-                IMPORT  __use_two_region_memory
-                EXPORT  __user_initial_stackheap
-
-__user_initial_stackheap PROC
-                LDR     R0, =  Heap_Mem
-                LDR     R1, =(Stack_Mem + Stack_Size)
-                LDR     R2, = (Heap_Mem +  Heap_Size)
-                LDR     R3, = Stack_Mem
-                BX      LR
-                ENDP
-
-                ALIGN
-
-                ENDIF
-
-
                 END

targets/TARGET_ARM_SSG/TARGET_MPS2/TARGET_MPS2_M0P/device/TOOLCHAIN_ARM_STD/startup_MPS2.S

@@ -34,31 +34,6 @@
 ;           CMSDK_CM0P Device
 ;
 ;******************************************************************************
-;
-;-------- <<< Use Configuration Wizard in Context Menu >>> ------------------
-;
-
-; <h> Heap Configuration
-;   <o>  Heap Size (in Bytes) <0x0-0xFFFFFFFF:8>
-; </h>
-
-Heap_Size       EQU     0x00000400
-
-                AREA    HEAP, NOINIT, READWRITE, ALIGN=3
-__heap_base
-Heap_Mem        SPACE   Heap_Size
-__heap_limit
-
-; <h> Stack Configuration
-;   <o> Stack Size (in Bytes) <0x0-0xFFFFFFFF:8>
-; </h>
-
-Stack_Size      EQU     0x00001000
-
-                AREA    STACK, NOINIT, READWRITE, ALIGN=3
-Stack_Mem       SPACE   Stack_Size
-
-__initial_sp    EQU     0x20400000
 
                 PRESERVE8
                 THUMB
@@ -70,8 +45,9 @@ __initial_sp    EQU     0x20400000
                 EXPORT  __Vectors
                 EXPORT  __Vectors_End
                 EXPORT  __Vectors_Size
+                IMPORT  |Image$$ARM_LIB_STACK$$ZI$$Limit|
 
-__Vectors       DCD     __initial_sp              ; Top of Stack
+__Vectors       DCD     |Image$$ARM_LIB_STACK$$ZI$$Limit| ; Top of Stack
                 DCD     Reset_Handler             ; Reset Handler
                 DCD     NMI_Handler               ; NMI Handler
                 DCD     HardFault_Handler         ; Hard Fault Handler
@@ -239,30 +215,4 @@ PORT0_7_Handler
                 ALIGN
 
 
-; User Initial Stack & Heap
-
-                IF      :DEF:__MICROLIB
-
-                EXPORT  __initial_sp
-                EXPORT  __heap_base
-                EXPORT  __heap_limit
-
-                ELSE
-
-                IMPORT  __use_two_region_memory
-                EXPORT  __user_initial_stackheap
-
-__user_initial_stackheap PROC
-                LDR     R0, =  Heap_Mem
-                LDR     R1, =(Stack_Mem + Stack_Size)
-                LDR     R2, = (Heap_Mem +  Heap_Size)
-                LDR     R3, = Stack_Mem
-                BX      LR
-                ENDP
-
-                ALIGN
-
-                ENDIF
-
-
                 END