Is there callgraph support for MIPS processors, either n32 or n64? This question was asked on 2/19/2008 by Anirban Sinha but there wasn't a response posted.
I can't find source similar to arch/arm/oprofile/backtrace.c which implements the backtrace for MIPS. One MIPS n32 ABI document shows R30 as the frame pointer if required. So couldn't an efficient userspace backtrace be implemented (if it's not already) for code compiled with -fno-omit-frame-pointer?