RE: new port

[Jeremy Bennett <jeremy dot bennett at embecosm dot com>]

Hi Florent,

I had this problem with the OpenRISC port. It was caused by incorrect
prologue analysis, leading to the issues described by Hui Zhu and
Anthony Berent.

So I suggest looking at the skip_prologue function in your architectural
description. In my case, the problem was due to wrongly caching a value
rather than an address.

I wrote a HOWTO for porting GDB, based on my experience with the
OpenRISC. Some of that is now incorporated into the GNU Internals
manual, but you may find the original application note helpful:

        http://www.embecosm.com/download/ean3.html

HTH,


Jeremy

On Thu, 2009-05-14 at 15:05 +0100, Anthony Berent wrote:
> Florent,
> 
> I have also been porting to a new architecture, and recently solved similar
> problems with next. The way next works is that, after a step, it checks
> whether an extra frame has been added to the stack. If it has, and various
> other checks are satisfied, then it places a breakpoint on the return
> address and runs on. Otherwise it simply stops after the first step.
> 
> Try stepping into the function using stepi, stopping at its first
> instruction, and then having a look at the stack frames (using bt and "info
> frames"). If these look wrong then that is probably your problem.
> 
> - Anthony
> 
> -----Original Message-----
> From: gdb-owner@sourceware.org [mailto:gdb-owner@sourceware.org] On Behalf
> Of Florent DEFAY
> Sent: 14 May 2009 14:24
> To: gdb@sourceware.org
> Subject: new port
> 
> Hi,
> 
> I work on porting GDB to a new arch.
> I already ported GCC.
> 
> I meet some problems, I need help.
> 
> At the moment, I can use most of basic GDB commands.
> 
> I can set breakpoints and stop on them. I can set breakpoints on function
> names.
> I can step. I can read locals and registers.
> 
> When I use the command 'next', it should step and skip functions. The
> problem is that
> indeed it steps but it does not skip functions. It step into the function.
> 
> Please help.
> 
> 
> Regards.
> 
> Florent
> 
> 
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