A few changes for ARMCC compatibility

- "(uint32_t)APPLICATION_ADDRESS + 4" simply suppresses an warning from the
  compiler (related to doing arithmetic on void* pointers).
- "applicationResetHandler" is now static, to avoid placing it on the stack, since
  it is used after the stack pointer is set to the application's stack pointer.
- while(1) is needed for armcc. Without it, armcc insists to jump to the
  application's entry point only *after* restoring the context of
  "forwardControlToApplication":

    806c:       f380 8808       msr     MSP, r0
    8070:       481d            ldr     r0, [pc, ARMmbed#116]  ; (80e8 <forwardControlToApplication+0xe8>)
    8072:       6004            str     r4, [r0, #0]
    8074:       6828            ldr     r0, [r5, #0]
    8076:       e8bd 4070       ldmia.w sp!, {r4, r5, r6, lr}    ==> context restore
    807a:       4700            bx      r0                       ==> jump to application

This changes the application's initial stack pointer. Because of this, the
cloud client example doesn't start anymore when concatenated with the bootloader.

With "while(1);" in place, we get the right behaviour:

    806a:       f380 8808       msr     MSP, r0
    806e:       481d            ldr     r0, [pc, ARMmbed#116]  ; (80e4 <forwardControlToApplication+0xe4>)
    8070:       6004            str     r4, [r0, #0]
    8072:       6828            ldr     r0, [r5, #0]
    8074:       4780            blx     r0                      ==> jump to application

Tested with armcc 5.03 update 3. Also tested that the GCC compilation still works
with these changes in place.

Author: Bogdan Marinescu

source/bootloader_platform.c

@@ -56,9 +56,10 @@ void forwardControlToApplication(void)
     tr_info(buffer);
 #endif
 
-    uint32_t JumpAddress = *(const uint32_t *)(APPLICATION_ADDRESS + 4);
+    uint32_t JumpAddress = *(const uint32_t *)((uint32_t)APPLICATION_ADDRESS + 4);
     typedef void (*pFunction)(void);
-    pFunction applicationResetHandler = (pFunction)JumpAddress;
+    static pFunction applicationResetHandler;
+    applicationResetHandler = (pFunction)JumpAddress;
 
     tr_info("application's jump address: %lx", JumpAddress);
     tr_info("application's stack address: %lx", *(const uint32_t *)APPLICATION_ADDRESS);
@@ -82,5 +83,8 @@ void forwardControlToApplication(void)
 #endif
 
     applicationResetHandler();                         /* Jump to application. */
+
+    /* Since we're jumping to the application above, this function doesn't return */
+    while(1);
 }
 #endif /* #ifdef TARGET_LIKE_ARM */