[coldfire-gnu-discuss] NPTL on 547x cpus

[Luigi 'Comio' Mantellini]

venerdì 14 maggio 2010 15:20 Maxim Kuvyrkov <maxim at codesourcery.com> ha 
scritto:
> On 5/14/10 5:08 PM, Luigi 'Comio' Mantellini wrote:
> > Now, I'm interested to use the last 4.4-217 in order to use the nptl
> > implementation, but unfortunately the pthread seems to be broken.
> 
> What do you mean by "broken"?

I have an heavy threaded application that uses mutexes, semaphores. The code 
generated by compiler, keeps some constants (for optimization reason) in 
registers, then are used in a infinite loop.

Using the lauterbach debugger, I noticed that the registers are not correctly 
restored returning by signal.

CONST1=...
CONST2=...
for (;;) {
 <---------- interrupted by signal ---------->
  use CONST1 
  use CONST2
  ...
}

I'm sorry but I cannot provide a better description now because I haven't 
access to debug facilities for the next days.


> 
> Did you apply the kernel patch that the Getting Started Guide mentions?
> 

I applied the requested patch for the 4.4-217 and kernel 2.6.25

> To add NPTL support to current ColdFire kernels one needs to apply one
> of the patches linked in this knowledge base entry:
> https://support.codesourcery.com/GNUToolchain/kbentry52 .
> 
> ...
> 
> > Has anyone used and tested the 4.4-x toolchains? I would like to have
> > feedback from cf developers
> 
> We at CodeSourcery run thousands, if not not millions, tests for each
> release.  Testing of 4.4-217 release included GLIBC testsuite which has
> many tests for libpthread.

I know the CS releases high quality toolchains. I'm supposing that somethins 
is wrong in my kernel (I started with the 2.6.10 and I ported by hand to 
2.6.23 and .25).

I can provide my patchset for the kernel if you are interested.

best regards,

luigi

-- 


Luigi 'Comio' Mantellini
R&D - Software

Industrie Dial Face S.p.A.
Via Canzo, 4
20068 Peschiera Borromeo (MI) Italy
Tel.: +39 02 5167 2813
Fax: +39 02 5167 2459 
E-mail: luigi.mantellini at idf-hit.com 
Website: http://www.idf-hit.com


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