[ECOS] Stack access violations in eCos

Larice Robert larice@vidisys.de
Thu Mar 20 10:11:00 GMT 2003

> Yes, you're absolutely right. However I think the patch needs one little 
> improvement: for thread stacks, we should use CYGBLD_ATTRIB_ALIGNED like 
> you say (but ATTRIB not ANNOTATE for consistency with other names in 
> cyg_type.h).
> However this patch deals with more than thread stacks, although that's the 
> main bit. It also does e.g. thread objects, in which case we should use a 
> different macro, like say:
> #define CYGBLD_ATTRIB_ALIGNOFTYPE( _type_ ) \ 
> __attribute__((aligned(__alignof__( _type_ ))))
> And I certainly know it's a pain, but we'd need ChangeLog entries for 
> these, although it's worth using a script to do this, e.g.
> for i in `cat filelist` ; do
>    CL=`echo $i | sed 's@current/.*@current/ChangeLog@g'`
>    sed "s@FILE@${i}@g" < /tmp/myentry > /tmp/myentry.tmp
>    cat /tmp/myentry.tmp $CL > $CL.new
>    mv $CL.new $CL
> done
> for some appropriate files "filelist" and "/tmp/myentry", e.g.
> 2003-03-19  Larice Robert  <larice@vidisys.de>
> 	* FILE: Add alignments where required.
> Finally, don't use a #warning for calmrisc32 just because you aren't sure.
> With that, I can apply your patch! And thanks for looking into all this 
> and spending the time!

Hello Jifl,

nice amount of work which you are shifting to me.

do you have a propose for CYGBLD_ATTRIB_ALIGN ?

garry once noted:
  #define CYGBLD_ATTRIB_ALIGN(__align__) __attribute__((aligned(__align__)))
i'd like to have an __attribute__((aligned)) for stacks though.
thats a special case for gcc, where gcc will itself deside how much alignement
is reasonable for the current machine architecture.
though gcc accepts __attribute__((aligned())) as well, the macro doesnt
accept an empty argument.

do you have some beautiful idea how to solve this ?

Robert Larice

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