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__rt_entry

4.23 __rt_entry

The symbol __rt_entry is the starting point for a program using the ARM® C library.

Control passes to __rt_entry after all scatter-loaded regions have been relocated to their execution addresses.

Usage

The default implementation of __rt_entry:
  1. Sets up the heap and stack.
  2. Initializes the C library by calling __rt_lib_init.
  3. Calls main().
  4. Shuts down the C library, by calling __rt_lib_shutdown.
  5. Exits.
__rt_entry must end with a call to one of the following functions:
exit()
Calls atexit()-registered functions and shuts down the library.
__rt_exit()
Shuts down the library but does not call atexit() functions.
_sys_exit()
Exits directly to the execution environment. It does not shut down the library and does not call atexit() functions.
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