freepascal.compiler/packages/libndsfpc/examples/debugging/exceptionTest/exceptionTest.pp

program main;

{$apptype arm9}
{$mode objfpc}

uses
  ctypes, nds9;

// The default exception handler displays the exception type - data abort or undefined instruction
// you can relate the exception to your code using arm-eabi-addr2line -e <elf file> <address>
// assuming you built with debug info this will display a source file and a line number
// The address of the instruction is shown as pc, beside the address which faulted
// the rest of the screen is a dump of the registers.

begin
  // install the default exception handler
  defaultExceptionHandler();

  // generate an exception
  pu32(250)^ := 100;
  
  while true do
    swiWaitForVBlank();

end.