Forcing use of my own memcpy() function

Technical Note 17095






8/19/2016 3:56 PM


This Technical Note describes how to force your application to use your function for copying data.


You want the application to use a memcpy() function that you have defined, instead of using the memcpy(), __aeabi_memcpy(), __aeabi_memcpy4() or __aeabi_memcpy8() functions from the runtime library.

There are two recommended ways to override memcpy():

  • Override the AEABI implementations __aeabi_memcpy(), __aeabi_memcpy4(), and __aeabi_memcpy8(), which are the implementations used by the compiler and libraries.
    • Template for version 8.50.9 is found here.
  • Use your own function name, for example my_memcpy().
    • Note that the library contains calls to __aeabi_memcpy(), __aeabi_memcpy4() and __aeabi_memcpy8(), which will not be replaced.


There might be other ways to force the use of your own memcpy(), but note that these two ways are the recommended ways of forcing the usage.

All product names are trademarks or registered trademarks of their respective owners

We do no longer support Internet Explorer. To get the best experience of, we recommend upgrading to a modern browser such as Chrome or Edge.