Re: [Libunwind-devel] libunwind support for Mips

[John Knight]

Thanks Dave.  I appreciate the info.  I am working now to get it into one of 
our routers to see how well it works!  I am hopeful.

Best Regards,

John


-----Original Message-----
From: Dave Watson [mailto:address@hidden
Sent: Thursday, January 19, 2017 10:57 AM
To: John Knight
Cc: address@hidden
Subject: Re: [Libunwind-devel] libunwind support for Mips

On 01/19/17 02:32 AM, John Knight wrote:
> I did a brief search of the mail archives and noticed some mail suggesting 
> support for Mips.  Can you tell me if libunwind does in fact support Mips?  
> If not, is it in development?

Yes, Mips is supported.  Looks like the README needs an update...

> We have a number of different processor architectures (all running linux) 
> that we would like to have backtrace support on. Unfortunately, we cannot use 
> glibc's backtrace capability for various reasons... so we are looking for an 
> alternative.  In particular, we want to be able to provide a stack backtrace 
> when an application on the router crashes due to error such as segmentation 
> fault or illegal instruction.  The current idea is for each application to 
> have a signal handler that catches the usual catastrophic errors and the 
> signal handler will call code to provide backtrace.  We want something 
> lightweight, and libunwind sounds perfect for the job, but alas, it needs to 
> run on all of our processors... mips and arm are the big ones.

arm is heavily used, and should work fine.  It supports a fast unw_backtrace(), 
even.  Mips isn't used as much, and unw_backtrace will be slower, but AFAIK 
should work fine.

Backtracing from a signal handler is one of the primary use cases for libunwind.

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