On Wed, 8 Mar 2006, Michael Shapiro wrote:
>>
>> On Mon, 6 Mar 2006, Michael Shapiro wrote:
>>>
>>> Hmm: as you see there is no NAME for that mapping, so this is why you're
>>> not getting any symbols: we didn't match it to an object file.
>>> Can you send back the entire $m output?
>>
>> You are dead on; 100800000 - 10090e000 doesn't contain a name:
>>
>> BASE LIMIT SIZE NAME
>> 100000000 100400000 400000 /opt/U/_app
>> 100400000 100800000 400000
>> 100800000 10090e000 10e000
>> 100a0c000 100ab6000 aa000 /opt/U/_app
>>
>> Does anyone happen to know if there is an alternative way to find the
>> executable or library that is mapped (I am assuming it is mapped, which
>> may not be the case given Mike' previous comments on dlclose()) at
>> 100800000? If that isn't possible, is there a way to take an address
>> (0x10085f2a0 in this case) and resolve it to a symbol name in the file?
>> My attempts to resolve this by parsing the executable and library symbol
>> tables has so far been fruitless.
>>
>> Thanks again for the feedback,
>> - Ryan
>
> This may be a bug in libproc or librtld_db in that it should be matching
> those mappings to the object but is having trouble doing so.
> If you e-mail the output of elfdump -p /opt/U/_app we can look at that.
>
> -Mike
Hi Mike,
Here is the elfdump output:
$ elfdump -p /opt/U/_app
Program Header[0]:
p_vaddr: 0x100000040 p_flags: [ PF_X PF_R ]
p_paddr: 0 p_type: [ PT_PHDR ]
p_filesz: 0x118 p_memsz: 0x118
p_offset: 0x40 p_align: 0
Program Header[1]:
p_vaddr: 0 p_flags: [ PF_R ]
p_paddr: 0 p_type: [ PT_INTERP ]
p_filesz: 0x19 p_memsz: 0
p_offset: 0x158 p_align: 0
Program Header[2]:
p_vaddr: 0x100000000 p_flags: [ PF_X PF_R ]
p_paddr: 0 p_type: [ PT_LOAD ]
p_filesz: 0x90c163 p_memsz: 0x90c163
p_offset: 0 p_align: 0x100000
Program Header[3]:
p_vaddr: 0x100a0c168 p_flags: [ PF_X PF_W PF_R ]
p_paddr: 0 p_type: [ PT_LOAD ]
p_filesz: 0xa9378 p_memsz: 0x11f4d0
p_offset: 0x90c168 p_align: 0x100000
Program Header[4]:
p_vaddr: 0x100a11228 p_flags: [ PF_X PF_W PF_R ]
p_paddr: 0 p_type: [ PT_DYNAMIC ]
p_filesz: 0x220 p_memsz: 0
p_offset: 0x911228 p_align: 0
If you have any thoughts or suggestions, I would love to hear them.
Thanks for the feedback,
- Ryan
--
UNIX Administrator
http://daemons.net/~matty
