Re: arm-elf: backtrace functionality for arm-elf. (on cygwin)

[Dan Kegel <dank at kegel dot com>]

Tarmo Pikaro wrote:
> I'm searching backtrace functionality analogue to:
>
> http://www.lrz-muenchen.de/services/compute/linux-cluster/kernel/glibc-2.2.2/libc_33.html
> Hi !
>
> I rephrase my previous question a little bit.
>
> I have found in gnude 
> (http://sourceforge.net/projects/gnude/)
>
> some sort of unwind functionlity
> in unwind.h header file. But it provides only one
> function called _Unwind_Backtrace and web does have
> much help on issue.

Looks like that function is part of libgcc, and was introduced
as of gcc-3.3.  So if you use gcc-3.3.2, say, it should be there
for you.
The only mention of it in the source tree are in the following four files:

./gcc/ChangeLog:        * unwind.inc (_Unwind_Backtrace): New function.
./gcc/ChangeLog:        * unwind.h (_Unwind_Backtrace): Declare it.
./gcc/ChangeLog:        * libgcc-std.ver (_Unwind_Backtrace): Export it.
./gcc/libgcc-std.ver:  _Unwind_Backtrace
./gcc/unwind.h:extern _Unwind_Reason_Code _Unwind_Backtrace (_Unwind_Trace_Fn, void *);
./gcc/unwind.inc:_Unwind_Backtrace(_Unwind_Trace_Fn trace, void * trace_argument)

> Meanwhile in glibc there is backtrace function but I
> guess it were removed from gnude package. My best
> guess is that it weren't implemented while porting
> glibc library to arm-elf compiler. (toolchain)

arm-elf does not use glibc; it uses newlib.  Thus it might
not have all the functions provided by glibc.

> Is there a way to get backtrace support (e.g. using
> _Unwind_Backtrace function)
> or when backtrace functionlity will come to official
> arm-elf build ?

I haven't played with it myself, but it kind of looks
like you might be able to use libgcc's _Unwind_Backtrace
on arm-elf with gcc-3.3.x.

- Dan


--
My technical stuff: http://kegel.com
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