rcar:logging: Fix forever assert recursion hang

Forever recursive occurring is at (4) in below snip of code.
This patch updates source code of rcar_log_func to avoid this situation.

-------------------------------------------------------------------------
 # ifdef NDEBUG
 # define assert(expr)	((void)0)
 # else
 # define assert(expr)	\
   ((expr) ? (void)0 : _assert_trap(#expr, __FILE__, __LINE__,
    __func__))// (2)
 # endif

_assert_trap()
_assert_log();
EMSG_RAW()
trace_printf()
trace_vprintf();   // lib/libutils/ext/trace.c
trace_ext_puts(const char *str)   //core\arch\arm\plat-rcar\trace_ext.c
log_debug_send(msg_block, msg_block_num);
cpu_id = get_core_pos();       //core\arch\arm\plat-rcar\rcar_log_func.c
  /*
   * Foreign interrupts must be disabled before playing with current
  * core since we otherwise may be rescheduled to a different core.
  */
  assert(thread_get_exceptions() & THREAD_EXCP_FOREIGN_INTR); //(4)
	return __get_core_pos();

-------------------------------------------------------------------------

Signed-off-by: Dien Pham <[email protected]>

core/arch/arm/plat-rcar/rcar_log_func.c

@@ -121,7 +121,13 @@ void log_debug_send(const struct msg_block_t *msg_block, int32_t msg_block_num)
 	size_t memcpy_size;
 	int32_t i;
 
-	cpu_id = get_core_pos();
+	/*
+	 * Foreign interrupts must be disabled before playing with current
+	 * core since we otherwise may be rescheduled to a different core.
+	 */
+	if (!(thread_get_exceptions() & THREAD_EXCP_FOREIGN_INTR))
+		return;
+	cpu_id = __get_core_pos();
 
 	if ((log_nonsec_ptr != NULL) && (cpu_id < CFG_TEE_CORE_NB_CORE)) {
 		log_area = &log_nonsec_ptr[cpu_id * LOG_NS_CPU_AREA_SIZE];