dwarf2 error

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* dwarf2 error
@ 2011-06-01 11:09 naga raj
  2011-06-01 15:35 ` Ian Lance Taylor
  0 siblings, 1 reply; 6+ messages in thread
From: naga raj @ 2011-06-01 11:09 UTC (permalink / raw)
  To: gcc-help

Hi,

   I have ported Gcc-4.6 to an embedded target. I have made dwarf2
debugging information as default.

   My error is that my GDB is unable to display local variables of
main function in one of my application program.

   It is giving error as -------> Could not find the frame base for "main".

  But it has all the frame information correctly and backtrace command
in gdb is also working fine.

  The same application program is displaying local variables with
Dwarf3 debugging information.

  I have debugged it an came to know that my GCC generating wrong
loc_ptr address so as a result it is generating that error print
statement.

 Is it a bug or my assumption is wrong??

Thanks in advance,
Nagaraju

^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: dwarf2 error
  2011-06-01 11:09 dwarf2 error naga raj
@ 2011-06-01 15:35 ` Ian Lance Taylor
  2011-06-02  3:58   ` naga raj
  0 siblings, 1 reply; 6+ messages in thread
From: Ian Lance Taylor @ 2011-06-01 15:35 UTC (permalink / raw)
  To: naga raj; +Cc: gcc-help

naga raj <gnuuser.raj@gmail.com> writes:

>    I have ported Gcc-4.6 to an embedded target. I have made dwarf2
> debugging information as default.
>
>    My error is that my GDB is unable to display local variables of
> main function in one of my application program.
>
>    It is giving error as -------> Could not find the frame base for "main".
>
>   But it has all the frame information correctly and backtrace command
> in gdb is also working fine.
>
>   The same application program is displaying local variables with
> Dwarf3 debugging information.
>
>   I have debugged it an came to know that my GCC generating wrong
> loc_ptr address so as a result it is generating that error print
> statement.
>
>  Is it a bug or my assumption is wrong??

Which version of gdb?  It is often the case that newer versions of gcc
require newer versions of gdb.

It is also possible that there is a bug in gcc, but you didn't provide
enough information to know.

Ian

^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: dwarf2 error
  2011-06-01 15:35 ` Ian Lance Taylor
@ 2011-06-02  3:58   ` naga raj
  2011-06-02  5:51     ` Michael Eager
  0 siblings, 1 reply; 6+ messages in thread
From: naga raj @ 2011-06-02  3:58 UTC (permalink / raw)
  To: Ian Lance Taylor; +Cc: gcc-help, eager

Hi Ian,

   Thanks for the reply.
   I am using gdb-7.2 version and my target is Xilinx microblaze.

Thanks,
Nagaraju M

On Wed, Jun 1, 2011 at 9:05 PM, Ian Lance Taylor <iant@google.com> wrote:
> naga raj <gnuuser.raj@gmail.com> writes:
>
>>    I have ported Gcc-4.6 to an embedded target. I have made dwarf2
>> debugging information as default.
>>
>>    My error is that my GDB is unable to display local variables of
>> main function in one of my application program.
>>
>>    It is giving error as -------> Could not find the frame base for "main".
>>
>>   But it has all the frame information correctly and backtrace command
>> in gdb is also working fine.
>>
>>   The same application program is displaying local variables with
>> Dwarf3 debugging information.
>>
>>   I have debugged it an came to know that my GCC generating wrong
>> loc_ptr address so as a result it is generating that error print
>> statement.
>>
>>  Is it a bug or my assumption is wrong??
>
> Which version of gdb?  It is often the case that newer versions of gcc
> require newer versions of gdb.
>
> It is also possible that there is a bug in gcc, but you didn't provide
> enough information to know.
>
> Ian
>

^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: dwarf2 error
  2011-06-02  3:58   ` naga raj
@ 2011-06-02  5:51     ` Michael Eager
  2011-06-02  6:46       ` naga raj
  0 siblings, 1 reply; 6+ messages in thread
From: Michael Eager @ 2011-06-02  5:51 UTC (permalink / raw)
  To: naga raj; +Cc: Ian Lance Taylor, gcc-help

On 06/01/2011 08:58 PM, naga raj wrote:
> Hi Ian,
>
>     Thanks for the reply.
>     I am using gdb-7.2 version and my target is Xilinx microblaze.

If you put MicroBlaze in the subject line, I'm much more likely to
notice your email.

What sources are you using for GCC?  When you say you ported GCC
to MicroBlaze and made Dwarf debugging the default, this is very
odd, since there is support in GCC-4.6 for MicroBlaze which defaults
to Dwarf debug support.  Gcc-4.1.2 in the Xilinx EDK sources also
support Dwarf debugging.

As Ian said, there isn't enough information to tell whether
there is a bug in gcc or not.

Can you reproduce the error with a small test program?
How are you compiling it?
What gdb commands do you use which causes the error?
What is the Dwarf for the function and variables where the error occurs?
What is the locptr value that you think is incorrect?

-- 
Michael Eager	 eager@eagercon.com
1960 Park Blvd., Palo Alto, CA 94306  650-325-8077

^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: dwarf2 error
  2011-06-02  5:51     ` Michael Eager
@ 2011-06-02  6:46       ` naga raj
       [not found]         ` <BANLkTin=y4DkMqAzBB-7TM_j5UxFotTGyQ@mail.gmail.com>
  0 siblings, 1 reply; 6+ messages in thread
From: naga raj @ 2011-06-02  6:46 UTC (permalink / raw)
  To: Michael Eager; +Cc: Ian Lance Taylor, gcc-help

[-- Attachment #1: Type: text/plain, Size: 2502 bytes --]

Hi Mike,

   Thanks for your reply.

>Can you reproduce the error with a small test program?
  No, I am unable to reproduce the error. It is working fine with small programs

> How are you compiling it?
I am giving following compiler flags
 -mlittle-endian -mxl-barrel-shift -mxl-pattern-compare -mcpu=v8.20.a
-mno-xl-soft-mul

> What gdb commands do you use which causes the error?
  (gdb) target remote <ip-addr>:portnumber
  (gdb)load
  (gdb)break main
  (gdb) c
  (gdb)s
   (gdb)print i
    Could not find the frame base for "main"

>What is the Dwarf for the function and variables where the error occurs?
    I dont know how to see Dwarf for the function and variable.
    Please find the attached microblaze-readelf output file.


>What is the locptr value that you think is incorrect?
   In gdb source gdb/gdb/dwarf2loc.c file find_location_expression function
   It is calculating low/high addresses and comparing them with pc
  if (pc >= low && pc < high)
        {
          *locexpr_length = length;
          return loc_ptr;
        }

 But in this particular case this condition is never met as a result I
am getting the error "Could not find the frame base for "main""

The same application is working fine with Dwarf3. I have used
-gdwarf-3 in compilation and now GDN is displaying local variables
correctly.






On Thu, Jun 2, 2011 at 11:21 AM, Michael Eager <eager@eagercon.com> wrote:
> On 06/01/2011 08:58 PM, naga raj wrote:
>>
>> Hi Ian,
>>
>>    Thanks for the reply.
>>    I am using gdb-7.2 version and my target is Xilinx microblaze.
>
> If you put MicroBlaze in the subject line, I'm much more likely to
> notice your email.
>
> What sources are you using for GCC?  When you say you ported GCC
> to MicroBlaze and made Dwarf debugging the default, this is very
> odd, since there is support in GCC-4.6 for MicroBlaze which defaults
> to Dwarf debug support.  Gcc-4.1.2 in the Xilinx EDK sources also
> support Dwarf debugging.
>
> As Ian said, there isn't enough information to tell whether
> there is a bug in gcc or not.
>
> Can you reproduce the error with a small test program?
> How are you compiling it?
> What gdb commands do you use which causes the error?
> What is the Dwarf for the function and variables where the error occurs?
> What is the locptr value that you think is incorrect?
>
> --
> Michael Eager    eager@eagercon.com
> 1960 Park Blvd., Palo Alto, CA 94306  650-325-8077
>

[-- Attachment #2: info --]
[-- Type: application/octet-stream, Size: 16097 bytes --]

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   164: 000016c8     0 NOTYPE  GLOBAL DEFAULT   13 __data_start
   165: 00000000     0 NOTYPE  WEAK   DEFAULT  UND _Jv_RegisterClasses
   166: 00000624     0 NOTYPE  GLOBAL DEFAULT    5 _program_clean
   167: 00001104    16 FUNC    GLOBAL DEFAULT    5 XAssertSetCallback
   168: 000016c8     0 NOTYPE  GLOBAL DEFAULT  ABS _SDA2_BASE_
   169: 00000000     0 NOTYPE  WEAK   DEFAULT  UND __register_frame_info
   170: 00000650   156 NOTYPE  GLOBAL DEFAULT    5 __interrupt_handler

No version information found in this file.

^ permalink raw reply	[flat|nested] 6+ messages in thread

[parent not found: <BANLkTin=y4DkMqAzBB-7TM_j5UxFotTGyQ@mail.gmail.com>]

* Re: dwarf2 error
       [not found]         ` <BANLkTin=y4DkMqAzBB-7TM_j5UxFotTGyQ@mail.gmail.com>
@ 2011-06-02 13:02           ` Michael Eager
  0 siblings, 0 replies; 6+ messages in thread
From: Michael Eager @ 2011-06-02 13:02 UTC (permalink / raw)
  To: naga raj; +Cc: gcc-help

On 06/02/2011 12:17 AM, naga raj wrote:
> Hi Mike,
>
>    Please find the attached file which consists of debugging information.

The custom on the GCC mailing list is not to top-post.  Please trim your
reply and add comments at the end or interspersed.  Again, putting MicroBlaze
in the subject line will help me notice the email.

The readelf and dwarf dumps you attached are long.  In the future, please
trim them down to just include the data which is relevant and include in
the body of the email.

 >> How are you compiling it?
 > I am giving following compiler flags
 >  -mlittle-endian -mxl-barrel-shift -mxl-pattern-compare -mcpu=v8.20.a
 > -mno-xl-soft-mul

Clearly these are not all of the flags you are passing to the compiler.
You are generating Dwarf.  What are you specifying to generate debug output?

 >> What is the locptr value that you think is incorrect?
 >   In gdb source gdb/gdb/dwarf2loc.c file find_location_expression function
 >   It is calculating low/high addresses and comparing them with pc
 >  if (pc >= low && pc < high)
 >        {
 >          *locexpr_length = length;
 >          return loc_ptr;
 >        }

What is the locptr value that you think is incorrect?  This would be
from the .debug_loc section for the program.

 > The same application is working fine with Dwarf3. I have used
 > -gdwarf-3 in compilation and now GDN is displaying local variables
 > correctly.

What are the differences in the Dwarf output between compiling with
-g and -gdwarf-3?  There are some differences in gcc between Dwarf2
and Dwarf3+, but I don't think that they would affect location exprs.

-- 
Michael Eager	 eager@eagercon.com
1960 Park Blvd., Palo Alto, CA 94306  650-325-8077

^ permalink raw reply	[flat|nested] 6+ messages in thread

end of thread, other threads:[~2011-06-02 13:02 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2011-06-01 11:09 dwarf2 error naga raj
2011-06-01 15:35 ` Ian Lance Taylor
2011-06-02  3:58   ` naga raj
2011-06-02  5:51     ` Michael Eager
2011-06-02  6:46       ` naga raj
     [not found]         ` <BANLkTin=y4DkMqAzBB-7TM_j5UxFotTGyQ@mail.gmail.com>
2011-06-02 13:02           ` Michael Eager

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