TARGET_Realtek: ISR stack size unification

Unify ISR stack size for targets which support MBED 5 (or MBED 2 and MBED 5).

 MBED 5 : 1 boards
----------------
REALTEK_RTL8195AM

 MBED 2, 5 : 0 boards
----------------

 MBED 2 : 0 boards (skipped)
----------------

Author: mprse

targets/TARGET_Realtek/TARGET_AMEBA/TARGET_RTL8195A/device/TOOLCHAIN_ARM_STD/rtl8195a.sct

@@ -1,3 +1,5 @@
+#! armcc -E
+#include "mbed_config.h"
 ; Realtek Semiconductor Corp.
 ;
 ; RTL8195A ARMCC Scatter File
@@ -10,6 +12,16 @@
 ;   DRAM (rwx)   : ORIGIN = 0x30000000, LENGTH = 2M
 ; }
 
+#if (defined(__stack_size__))
+  #define Stack_Size                   __stack_size__
+#else
+  #if (defined(MBED_CONF_RTOS_PRESENT))
+    #define Stack_Size                   0x0400
+  #else
+    #define Stack_Size                   0x1000
+  #endif
+#endif
+
 LR_IRAM 0x10007000 (0x70000 - 0x7000) {
 
   IMAGE2_TABLE 0x10007000 FIXED {
@@ -43,7 +55,7 @@ LR_IRAM 0x10007000 (0x70000 - 0x7000) {
     *mbed_boot*.o (+ZI)
   }
 
-  ARM_LIB_STACK (0x10070000 - 0x1000) EMPTY 0x1000 {
+  ARM_LIB_STACK (0x10070000 - Stack_Size) EMPTY Stack_Size {
   }
 }
 

targets/TARGET_Realtek/TARGET_AMEBA/TARGET_RTL8195A/device/TOOLCHAIN_GCC_ARM/rtl8195a.ld

@@ -25,9 +25,6 @@ MEMORY
   SRAM2 (rwx)      : ORIGIN = 0x30000000, LENGTH = 2M
 }
 
-/* Stack sizes: */
-StackSize = 0x1000;
-
 /* Linker script to place sections and symbol values. Should be used together
  * with other linker script that defines memory regions FLASH and RAM.
  * It references following symbols, which must be defined in code:
@@ -195,7 +192,7 @@ SECTIONS
         __end__ = .;
         end = __end__;
         *(.heap*)
-    . = ORIGIN(SRAM1) + LENGTH(SRAM1) - StackSize;
+    . = ORIGIN(SRAM1) + LENGTH(SRAM1) - Stack_Size;
         __HeapLimit = .;
     } > SRAM1
 
@@ -215,13 +212,13 @@ SECTIONS
     {
         __StackLimit = .;
         *(.stack)
-    . += StackSize - (. - __StackLimit);
+    . += Stack_Size;
     } > SRAM1
 
     /* Set stack top to end of RAM, and stack limit move down by
      * size of stack_dummy section */
     __StackTop = ORIGIN(SRAM1) + LENGTH(SRAM1);
-    __StackLimit = __StackTop - SIZEOF(.stack_dummy);
+    __StackLimit = __StackTop - Stack_Size;
     PROVIDE(__stack = __StackTop);
 
     /* Check if data + heap + stack exceeds RAM limit */

targets/TARGET_Realtek/TARGET_AMEBA/TARGET_RTL8195A/device/TOOLCHAIN_GCC_ARM/rtl8195a_startup.S

@@ -17,6 +17,19 @@
     .syntax unified
     .thumb
 
+    .section .stack
+    .align 3
+#ifdef __STACK_SIZE
+    .equ    Stack_Size, __STACK_SIZE
+#else
+    #if defined(MBED_CONF_RTOS_PRESENT)
+      .equ    Stack_Size, 0x400
+    #else
+      .equ    Stack_Size, 0x1000
+    #endif
+#endif
+
+    .global  Stack_Size
     .global  __StackTop
     .global  PLAT_Init
 

targets/TARGET_Realtek/TARGET_AMEBA/TARGET_RTL8195A/device/TOOLCHAIN_IAR/rtl8195a.icf

@@ -29,7 +29,7 @@ define region TCM_region = mem:[from __DTCM_start__ to __DTCM_end__];
 define region RAM_region = mem:[from __SRAM_start__ to __SRAM_end__] |
                            mem:[from __DRAM_start__ to __DRAM_end__];
 
-define block CSTACK with alignment = 8, size = 0x1000  { };
+define block CSTACK with alignment = 8, size = 0x400  { };
 define block HEAP   with alignment = 8, size = 0x19000 { };
 
 do not initialize  { section .noinit };

targets/TARGET_Realtek/mbed_rtx.h

@@ -21,24 +21,5 @@
 
 #include "rtl8195a.h"
 
-#if defined(__CC_ARM) || (defined(__ARMCC_VERSION) && (__ARMCC_VERSION >= 6010050))
-    extern uint32_t             Image$$ARM_LIB_STACK$$ZI$$Base[];
-    extern uint32_t             Image$$ARM_LIB_STACK$$ZI$$Length[];
-    #define ISR_STACK_START     (unsigned char *)(Image$$ARM_LIB_STACK$$ZI$$Base)
-    #define ISR_STACK_SIZE      (uint32_t)(Image$$ARM_LIB_STACK$$ZI$$Length)
-    #define INITIAL_SP          (uint32_t)(Image$$ARM_LIB_STACK$$ZI$$Base)
-#elif defined(__GNUC__)
-    extern uint32_t             __StackTop[];
-    extern uint32_t             __StackLimit[];
-    extern uint32_t             __HeapLimit[];
-    #define INITIAL_SP          (__StackTop)
-#endif
-
-#if defined(__GNUC__)
-#ifndef ISR_STACK_SIZE
-#define ISR_STACK_SIZE          (0x1000)
-#endif
-#endif
-
 #endif
 #endif