Re: Oprofile callgraph support on the MIPS architecture

[David Daney <david.s.daney@gmail.com>]

On 03/26/2011 07:02 PM, Gergely Kis wrote:
> Dear List Members,
>
> We would like to announce the initial version of oprofile callgraph
> support on the MIPS architecture.
>
[...]

> You may download the code and access the documentation on the following URL:
> http://oss.homejinni.com/redmine/projects/mips-oprofile
>

Instructions for submitting patches may be found here:

http://git.linux-mips.org/?p=linux.git;a=tree;f=Documentation/development-process;hb=f70c04ff7ad61bca1ed06390558568c6c8074139

That said, how do you handle the case of getting a fault while reading 
code/data while unwinding?

Also I don't see how you handle these cases:

o Leaf functions where neither the $ra is saved to the stack, nor the 
stack pointer adjusted.

o Functions where $sp is adjusted several times (use of alloca() or VLAs).

o Functions with multiple return points (i.e. 'jr $ra' in the middle of 
a function).

o Functions with more than 1024 instructions.


Thanks,
David Daney