CDK4NIOS stands for Cross Development Kit for Altera's soft core processor NIOS and should you support with a comprehensive Assembler and C/C++ development environment under Linux. It will present only free of fee tools, so you can use it without risks.
A facility to keep a history of context information during runtime and then dumping it in a separate file when a problem occurs (similar to core dump).
[from port's pkg-descr] "pstack" is a workalike for the Solaris program of the same name. Running pstack on a process or core file produces a stack trace of each thread in that process.