This section describes how to re-implement functions to produce an application for a different execution environment, for example, embedded in ROM or used with a Real Time Operating System (RTOS).

Symbols that start with a single or double underscore, _ or __, name functions that are used as part of the low-level implementation. You can re-implement some of these functions.

Additional information on these library functions is available in the rt_heap.h, rt_locale.h, rt_misc.h, and rt_sys.h include files and the rt_memory.s assembler file.

See the following specifications for descriptions of functions that have the prefix __cxa or __aeabi: