diff --git a/rtos/TARGET_CORTEX/TOOLCHAIN_ARM_MICRO/mbed_boot_arm_micro.c b/rtos/TARGET_CORTEX/TOOLCHAIN_ARM_MICRO/mbed_boot_arm_micro.c
index 4684257d11..c968deb755 100644
--- a/rtos/TARGET_CORTEX/TOOLCHAIN_ARM_MICRO/mbed_boot_arm_micro.c
+++ b/rtos/TARGET_CORTEX/TOOLCHAIN_ARM_MICRO/mbed_boot_arm_micro.c
@@ -37,10 +37,10 @@ void _main_init(void)
 {
     /* microlib only supports the two region memory model */
 
-    mbed_heap_start = (unsigned char*)__heap_base;
+    mbed_heap_start = (unsigned char *)__heap_base;
     mbed_heap_size = (uint32_t)__heap_base - (uint32_t)__heap_limit;
 
-    mbed_stack_isr_start = (unsigned char*)((uint32_t)__initial_sp - ISR_STACK_SIZE);
+    mbed_stack_isr_start = (unsigned char *)((uint32_t)__initial_sp - ISR_STACK_SIZE);
     mbed_stack_isr_size = ISR_STACK_SIZE;
 
     mbed_init();
diff --git a/rtos/TARGET_CORTEX/TOOLCHAIN_ARM_STD/mbed_boot_arm_std.c b/rtos/TARGET_CORTEX/TOOLCHAIN_ARM_STD/mbed_boot_arm_std.c
index 9bcacc271c..1475082d8a 100644
--- a/rtos/TARGET_CORTEX/TOOLCHAIN_ARM_STD/mbed_boot_arm_std.c
+++ b/rtos/TARGET_CORTEX/TOOLCHAIN_ARM_STD/mbed_boot_arm_std.c
@@ -105,7 +105,7 @@ __asm(".global __use_no_semihosting\n\t");
 //lint -esym(9003, os_libspace*) "variables 'os_libspace*' defined at module scope"
 
 // Memory for libspace
-static uint32_t os_libspace[OS_THREAD_LIBSPACE_NUM+1][LIBSPACE_SIZE/4] \
+static uint32_t os_libspace[OS_THREAD_LIBSPACE_NUM + 1][LIBSPACE_SIZE / 4] \
 __attribute__((section(".bss.os.libspace")));
 
 // Thread IDs for libspace
@@ -113,7 +113,8 @@ static osThreadId_t os_libspace_id[OS_THREAD_LIBSPACE_NUM] \
 __attribute__((section(".bss.os.libspace")));
 
 // Check if Kernel has been started
-static uint32_t os_kernel_is_active (void) {
+static uint32_t os_kernel_is_active(void)
+{
     static uint8_t os_kernel_active = 0U;
 
     if (os_kernel_active == 0U) {
@@ -125,7 +126,8 @@ static uint32_t os_kernel_is_active (void) {
 }
 
 // Provide libspace for current thread
-void *__user_perthread_libspace (void) {
+void *__user_perthread_libspace(void)
+{
     osThreadId_t id;
     uint32_t     n;
 
@@ -182,7 +184,7 @@ __USED int _mutex_initialize(mutex *m)
     core_util_critical_section_enter();
     for (int i = 0; i < OS_MUTEX_STATIC_NUM; i++) {
         if (_static_mutexes[i] == NULL) {
-            _static_mutexes[i] = (mutex)-1; // dummy value to reserve slot
+            _static_mutexes[i] = (mutex) - 1; // dummy value to reserve slot
             slot = &_static_mutexes[i];
             //Use the static attrs
             attr.cb_size = sizeof(mbed_rtos_storage_mutex_t);
@@ -202,7 +204,7 @@ __USED int _mutex_initialize(mutex *m)
 
     /* Mutex pool exhausted, try using HEAP */
     attr.cb_size = sizeof(mbed_rtos_storage_mutex_t);
-    attr.cb_mem = (void*)malloc(attr.cb_size);
+    attr.cb_mem = (void *)malloc(attr.cb_size);
     if (attr.cb_mem == NULL) {
         osRtxErrorNotify(osRtxErrorClibSpace, m);
         return 0;
@@ -218,21 +220,24 @@ __USED int _mutex_initialize(mutex *m)
 }
 
 /* Acquire mutex */
-__USED void _mutex_acquire(mutex *m) {
+__USED void _mutex_acquire(mutex *m)
+{
     if (os_kernel_is_active() != 0U) {
         (void)osMutexAcquire(*m, osWaitForever);
     }
 }
 
 /* Release mutex */
-__USED void _mutex_release(mutex *m) {
+__USED void _mutex_release(mutex *m)
+{
     if (os_kernel_is_active() != 0U) {
         (void)osMutexRelease(*m);
     }
 }
 
 /* Free mutex */
-__USED void _mutex_free(mutex *m) {
+__USED void _mutex_free(mutex *m)
+{
     mutex *slot = NULL;
     core_util_critical_section_enter();
     for (int i = 0; i < OS_MUTEX_STATIC_NUM; i++) {
diff --git a/rtos/TARGET_CORTEX/TOOLCHAIN_GCC_ARM/mbed_boot_gcc_arm.c b/rtos/TARGET_CORTEX/TOOLCHAIN_GCC_ARM/mbed_boot_gcc_arm.c
index c6ff33cda0..105f780860 100644
--- a/rtos/TARGET_CORTEX/TOOLCHAIN_GCC_ARM/mbed_boot_gcc_arm.c
+++ b/rtos/TARGET_CORTEX/TOOLCHAIN_GCC_ARM/mbed_boot_gcc_arm.c
@@ -35,7 +35,7 @@ extern uint32_t __end__[];
 #define HEAP_SIZE       ((uint32_t)((uint32_t)INITIAL_SP - (uint32_t)HEAP_START))
 #endif
 
-extern void __libc_init_array (void);
+extern void __libc_init_array(void);
 
 /*
  * mbed entry point for the GCC toolchain
@@ -86,7 +86,8 @@ void mbed_toolchain_init()
 }
 
 extern int __real_main(void);
-int __wrap_main(void) {
+int __wrap_main(void)
+{
     /* For backwards compatibility */
     return __real_main();
 }
@@ -94,22 +95,22 @@ int __wrap_main(void) {
 /* Opaque declaration of _reent structure */
 struct _reent;
 
-void __rtos_malloc_lock( struct _reent *_r )
+void __rtos_malloc_lock(struct _reent *_r)
 {
     osMutexAcquire(malloc_mutex_id, osWaitForever);
 }
 
-void __rtos_malloc_unlock( struct _reent *_r )
+void __rtos_malloc_unlock(struct _reent *_r)
 {
     osMutexRelease(malloc_mutex_id);
 }
 
-void __rtos_env_lock( struct _reent *_r )
+void __rtos_env_lock(struct _reent *_r)
 {
     osMutexAcquire(env_mutex_id, osWaitForever);
 }
 
-void __rtos_env_unlock( struct _reent *_r )
+void __rtos_env_unlock(struct _reent *_r)
 {
     osMutexRelease(env_mutex_id);
 }
diff --git a/rtos/TARGET_CORTEX/TOOLCHAIN_IAR/mbed_boot_iar.c b/rtos/TARGET_CORTEX/TOOLCHAIN_IAR/mbed_boot_iar.c
index e5c0af783d..387b7f8dc1 100644
--- a/rtos/TARGET_CORTEX/TOOLCHAIN_IAR/mbed_boot_iar.c
+++ b/rtos/TARGET_CORTEX/TOOLCHAIN_IAR/mbed_boot_iar.c
@@ -27,7 +27,7 @@
 #pragma section="CSTACK"
 #pragma section="HEAP"
 
-extern void* __vector_table;
+extern void *__vector_table;
 extern int  __low_level_init(void);
 extern void __iar_data_init3(void);
 extern __weak void __iar_init_core(void);
@@ -53,7 +53,7 @@ extern void __iar_dynamic_initialization(void);
  * <IAR>\arm\src\lib\thumb\cstartup_M.s
  */
 #pragma required=__vector_table
-void __iar_program_start( void )
+void __iar_program_start(void)
 {
     /* the calls below are normally made in IAR cstartup */
     __iar_init_core();
@@ -74,10 +74,10 @@ void __iar_program_start( void )
     __iar_data_init3();
 
     /* mbed specific code */
-    mbed_heap_start = (unsigned char*)__section_begin("HEAP");
+    mbed_heap_start = (unsigned char *)__section_begin("HEAP");
     mbed_heap_size = (uint32_t)__section_size("HEAP");
 
-    mbed_stack_isr_start = (unsigned char*)__section_begin("CSTACK");
+    mbed_stack_isr_start = (unsigned char *)__section_begin("CSTACK");
     mbed_stack_isr_size = (uint32_t)__section_size("CSTACK");
 
     mbed_init();
@@ -112,7 +112,7 @@ void __iar_system_Mtxinit(__iar_Rmtx *mutex) /* Initialize a system lock */
             attr.cb_size = sizeof(std_mutex_sys[index]);
             attr.attr_bits = osMutexRecursive | osMutexPrioInherit | osMutexRobust;
             std_mutex_id_sys[index] = osMutexNew(&attr);
-            *mutex = (__iar_Rmtx*)&std_mutex_id_sys[index];
+            *mutex = (__iar_Rmtx *)&std_mutex_id_sys[index];
             return;
         }
     }
@@ -123,18 +123,18 @@ void __iar_system_Mtxinit(__iar_Rmtx *mutex) /* Initialize a system lock */
 
 void __iar_system_Mtxdst(__iar_Rmtx *mutex) /* Destroy a system lock */
 {
-    osMutexDelete(*(osMutexId_t*)*mutex);
+    osMutexDelete(*(osMutexId_t *)*mutex);
     *mutex = 0;
 }
 
 void __iar_system_Mtxlock(__iar_Rmtx *mutex) /* Lock a system lock */
 {
-    osMutexAcquire(*(osMutexId_t*)*mutex, osWaitForever);
+    osMutexAcquire(*(osMutexId_t *)*mutex, osWaitForever);
 }
 
 void __iar_system_Mtxunlock(__iar_Rmtx *mutex) /* Unlock a system lock */
 {
-    osMutexRelease(*(osMutexId_t*)*mutex);
+    osMutexRelease(*(osMutexId_t *)*mutex);
 }
 
 void __iar_file_Mtxinit(__iar_Rmtx *mutex) /* Initialize a file lock */
@@ -148,7 +148,7 @@ void __iar_file_Mtxinit(__iar_Rmtx *mutex) /* Initialize a file lock */
             attr.cb_size = sizeof(std_mutex_file[index]);
             attr.attr_bits = osMutexRecursive | osMutexPrioInherit | osMutexRobust;
             std_mutex_id_file[index] = osMutexNew(&attr);
-            *mutex = (__iar_Rmtx*)&std_mutex_id_file[index];
+            *mutex = (__iar_Rmtx *)&std_mutex_id_file[index];
             return;
         }
     }
@@ -158,16 +158,16 @@ void __iar_file_Mtxinit(__iar_Rmtx *mutex) /* Initialize a file lock */
 
 void __iar_file_Mtxdst(__iar_Rmtx *mutex) /* Destroy a file lock */
 {
-    osMutexDelete(*(osMutexId_t*)*mutex);
+    osMutexDelete(*(osMutexId_t *)*mutex);
     *mutex = 0;
 }
 
 void __iar_file_Mtxlock(__iar_Rmtx *mutex) /* Lock a file lock */
 {
-    osMutexAcquire(*(osMutexId_t*)*mutex, osWaitForever);
+    osMutexAcquire(*(osMutexId_t *)*mutex, osWaitForever);
 }
 
 void __iar_file_Mtxunlock(__iar_Rmtx *mutex) /* Unlock a file lock */
 {
-    osMutexRelease(*(osMutexId_t*)*mutex);
+    osMutexRelease(*(osMutexId_t *)*mutex);
 }