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Re: AW: [Simulavr-devel] [patch #3453] gdbserver.c gdb_extract_hex_nu m(


From: Paul Schlie
Subject: Re: AW: [Simulavr-devel] [patch #3453] gdbserver.c gdb_extract_hex_nu m(...) bug fix (for more recent gdb versions)
Date: Tue, 19 Oct 2004 12:48:58 -0400
User-agent: Microsoft-Entourage/11.1.0.040913

I'm using Mac OSX with the latest development versions of gnu tools, and
choose to try the "old" C version to avoid some Linux communication
socket/port dependencies which seem to be present in simulavrxx from
reviewing the mail-list, and wanted to try to keep things simpler by not
having to deal initially with potential C++ coding/debug issues.

(personally, I think it would be a good idea to continue to support and
maintain simulavr, and possibly not think of it as "old" code, but rather as
the parent C implementation, as I don't see any good reason to abandon it in
favor of simulavrxx requiring C++ at the moment)

- are there any fixes in simulavrxx which have not been back-ported yet to
simulavr which would be helpful?

- it also may be a good idea to contribute simulavr to the gdb/binutils cvs
development branch, to enable gcc/binutils/gdb/etc. bug reporting and
verification via target simulation to proceed more easily to the benefit of
those interested in gnu avr tools.

Thanks, -paul-

> From: Klaus Rudolph <address@hidden>
> Date: Tue, 19 Oct 2004 10:33:15 +0200 (MEST)
> To: Frost_Tobias <address@hidden>
> Cc: <address@hidden>
> Subject: Re: AW: [Simulavr-devel] [patch #3453] gdbserver.c gdb_extract_hex_nu
> m(...) bug fix (for more recent gdb versions)
> 
> Hi,
> 
> yes I accepted the patch allready, thanks that you give me enough time
> to drink some cups of coffee :-)
> 
> I will check in the changes next days for simulavrxx.
> I actually not working on the old simulavr but I could do the change if
> someone is using the old version...
> 
> Bye
>    Klaus
> 
> 
> 
>> No, the patch's correct.
>> Num will be shifted by 4 every time the while is executed and then stored.
>> Then the low nibble will be ored into num
>> 
>> Example:
>> 
>> *p = ABCDEF
>> 
>> will be: (each line is one while-execution)
>> 
>>     num         
>> 0x0000 000A     
>> 0x0000 00AB
>> 0x0000 0ABC
>> 0x0000 ABCD
>> 0x000A BCDE
>> 0x00AB CDEF 
>> 
>>  num = (num << (i * 4)) | hex2nib (*p);  (replaced by following line) */
>> 
>> without the patch you'll get:
>> 
>> (i=0) -> no shift         0x0000 000A
>> (i=1 -> shifted with 4) ->     num = 0x0000 00A0  | 0x0B  -> num = 0x0000
>> 00AB
>> (i=2 -> num shifted with 8) -> num = 0x0000 AB00 | 0x0C -> num = 0x0000
>> AB0C
>> (ERROR!)
>> 
>>   
>>  
>> 
>> -----Urspr√ľngliche Nachricht-----
>> Von: Klaus Rudolph [mailto:address@hidden
>> Gesendet: Montag, 18. Oktober 2004 17:16
>> An: address@hidden
>> Betreff: [Simulavr-devel] [patch #3453] gdbserver.c
>> gdb_extract_hex_num(...) bug fix (for more recent gdb versions)
>> 
>> 
>> This mail is an automated notification from the patch tracker
>>  of the project: Simulavr: an AVR simulator.
>> 
>> 
> /**************************************************************************/
>> [patch #3453] Latest Modifications:
>> 
>> Changes by: 
>> Klaus Rudolph <address@hidden>
>> 'Date: 
>> Mon 18.10.2004 at 15:07 (Europe/Berlin)
>> 
>> ------------------ Additional Follow-up Comments
>> ----------------------------
>> Can you give me an idea what problem the patch should fix?
>> 
>> Your new line:
>>  num = (num << 4) | hex2nib (*p);
>> could never work I think. This will always change
>> the "0000000X0" position but nothing else!?.
>> If the tranmitted var is longer you have to change
>> the init of max_shifts but that is not done....
>> 
>> maybe I am totally confused today, but please let us know
>> what your problem is.
>> 
>> Why you have not send a patch file as patch?
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
> /**************************************************************************/
>> [patch #3453] Full Item Snapshot:
>> 
>> URL: <http://savannah.nongnu.org/patch/?func=detailitem&item_id=3453>
>> Project: Simulavr: an AVR simulator
>> Submitted by: Paul Schlie
>> On: Mon 18.10.2004 at 12:48
>> 
>> Category:  bug fix
>> Priority:  9 - Immediate
>> Resolution:  None
>> Privacy:  Public
>> Assigned to:  None
>> Originator Email:
>> Status:  Open
>> 
>> 
>> Summary:  gdbserver.c gdb_extract_hex_num(...) bug fix (for more recent
>> gdb
>> versions)
>> 
>> Original Submission:  static int
>> gdb_extract_hex_num (char **pkt, char stop)
>> {
>>     int i = 0;
>>     int num = 0;
>>     char *p = *pkt;
>>     int max_shifts = sizeof (int) * 2 - 1; /* max number of nibbles to
>> shift
>>                                               through */
>> 
>>     while ((*p != stop) && (*p != ''))
>>     {
>>         if (i > max_shifts)
>>             avr_error ("number too large");
>> 
>> /* This is broken for values encoded with greater than two hex digits,
>> which
>>     is typical in gdb sessions when leading 0's are encoded for integer
>> values
>>         num = (num << (i * 4)) | hex2nib (*p);  (replaced by following
>> line)
>> */
>>         num = (num << 4) | hex2nib (*p);
>>         i++;
>>         p++;
>>     }
>> 
>>     *pkt = p;
>>     return num;
>> }
>> 
>> 
>> Follow-up Comments
>> ------------------
>> 
>> 
>> -------------------------------------------------------
>> Date: Mon 18.10.2004 at 15:07       By: Klaus Rudolph <zfrdh>
>> Can you give me an idea what problem the patch should fix?
>> 
>> Your new line:
>>  num = (num << 4) | hex2nib (*p);
>> could never work I think. This will always change
>> the "0000000X0" position but nothing else!?.
>> If the tranmitted var is longer you have to change
>> the init of max_shifts but that is not done....
>> 
>> maybe I am totally confused today, but please let us know
>> what your problem is.
>> 
>> Why you have not send a patch file as patch?
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> For detailed info, follow this link:
>> <http://savannah.nongnu.org/patch/?func=detailitem&item_id=3453>
>> 
>> _______________________________________________
>>   Message sent via/by Savannah
>>   http://savannah.nongnu.org/
>> 
>> 
>> 
>> 
>> 
>> _______________________________________________
>> Simulavr-devel mailing list
>> address@hidden
>> http://lists.nongnu.org/mailman/listinfo/simulavr-devel
>> 
>> 
>> _______________________________________________
>> Simulavr-devel mailing list
>> address@hidden
>> http://lists.nongnu.org/mailman/listinfo/simulavr-devel
>> 
> 
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