* RE: Determining base address of shared library from core file
@ 2004-07-26 19:33 Bloch, Jack
2004-07-26 21:09 ` Kevin Buettner
0 siblings, 1 reply; 6+ messages in thread
From: Bloch, Jack @ 2004-07-26 19:33 UTC (permalink / raw)
To: 'Kevin Buettner'; +Cc: gdb
When doing this, I find a DT_DEBUG entry but is has a zero in the d_un.d_val
field (I am supposed to look at the executable and not the core dump right?)
-----Original Message-----
From: Kevin Buettner [mailto:kevinb@redhat.com]
Sent: Wednesday, July 21, 2004 1:53 PM
To: Bloch, Jack
Cc: gdb@sources.redhat.com
Subject: Re: Determining base address of shared library from core file
On Mon, 19 Jul 2004 07:51:31 -0700
"Bloch, Jack" <Jack.Bloch@icn.siemens.com> wrote:
> Is there an easy way to determine the base address of a shared library
from
> a core file?
It depends upon what you mean by "easy".
For an SVR4-like system (which includes Linux), you have to traverse
the dynamic section to find the address of the r_debug struct. Once
that is done, you still have to traverse the link_map structs to find
the desired address. See solib-svr4.c for the gory details.
(IMO, this isn't very easy.)
Kevin
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Determining base address of shared library from core file
2004-07-26 19:33 Determining base address of shared library from core file Bloch, Jack
@ 2004-07-26 21:09 ` Kevin Buettner
0 siblings, 0 replies; 6+ messages in thread
From: Kevin Buettner @ 2004-07-26 21:09 UTC (permalink / raw)
To: Bloch, Jack; +Cc: gdb
On Mon, 26 Jul 2004 12:20:10 -0700
"Bloch, Jack" <jack.bloch@siemens.com> wrote:
> When doing this, I find a DT_DEBUG entry but is has a zero in the d_un.d_val
> field
I don't know why you're seeing this. (Let me know when you figure it out...)
> (I am supposed to look at the executable and not the core dump right?)
Right.
Kevin
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Determining base address of shared library from core file
2004-07-26 21:15 Bloch, Jack
@ 2004-07-27 22:06 ` Kevin Buettner
0 siblings, 0 replies; 6+ messages in thread
From: Kevin Buettner @ 2004-07-27 22:06 UTC (permalink / raw)
To: Bloch, Jack; +Cc: gdb
On Mon, 26 Jul 2004 14:13:40 -0700
"Bloch, Jack" <jack.bloch@siemens.com> wrote:
> BTW, if I run readelf -d on my executable, it show a debug segment with a
> 0x0. I don't have to load the executable into memory somehow do I?
Yes, you have to fetch the dynamic section from the loaded process and
scan it instead of the contents of the executable. The dynamic linker
will have adjusted the in-memory copy of the dynamic section to contain
values relevant to the running process.
Kevin
^ permalink raw reply [flat|nested] 6+ messages in thread
* RE: Determining base address of shared library from core file
@ 2004-07-26 21:15 Bloch, Jack
2004-07-27 22:06 ` Kevin Buettner
0 siblings, 1 reply; 6+ messages in thread
From: Bloch, Jack @ 2004-07-26 21:15 UTC (permalink / raw)
To: 'Kevin Buettner'; +Cc: gdb
BTW, if I run readelf -d on my executable, it show a debug segment with a
0x0. I don't have to load the executable into memory somehow do I?
-----Original Message-----
From: Kevin Buettner [mailto:kevinb@redhat.com]
Sent: Wednesday, July 21, 2004 1:53 PM
To: Bloch, Jack
Cc: gdb@sources.redhat.com
Subject: Re: Determining base address of shared library from core file
On Mon, 19 Jul 2004 07:51:31 -0700
"Bloch, Jack" <Jack.Bloch@icn.siemens.com> wrote:
> Is there an easy way to determine the base address of a shared library
from
> a core file?
It depends upon what you mean by "easy".
For an SVR4-like system (which includes Linux), you have to traverse
the dynamic section to find the address of the r_debug struct. Once
that is done, you still have to traverse the link_map structs to find
the desired address. See solib-svr4.c for the gory details.
(IMO, this isn't very easy.)
Kevin
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Determining base address of shared library from core file
2004-07-19 18:28 Bloch, Jack
@ 2004-07-21 17:58 ` Kevin Buettner
0 siblings, 0 replies; 6+ messages in thread
From: Kevin Buettner @ 2004-07-21 17:58 UTC (permalink / raw)
To: Bloch, Jack; +Cc: gdb
On Mon, 19 Jul 2004 07:51:31 -0700
"Bloch, Jack" <Jack.Bloch@icn.siemens.com> wrote:
> Is there an easy way to determine the base address of a shared library from
> a core file?
It depends upon what you mean by "easy".
For an SVR4-like system (which includes Linux), you have to traverse
the dynamic section to find the address of the r_debug struct. Once
that is done, you still have to traverse the link_map structs to find
the desired address. See solib-svr4.c for the gory details.
(IMO, this isn't very easy.)
Kevin
^ permalink raw reply [flat|nested] 6+ messages in thread
* Determining base address of shared library from core file
@ 2004-07-19 18:28 Bloch, Jack
2004-07-21 17:58 ` Kevin Buettner
0 siblings, 1 reply; 6+ messages in thread
From: Bloch, Jack @ 2004-07-19 18:28 UTC (permalink / raw)
To: gdb
Is there an easy way to determine the base address of a shared library from
a core file?
Jack Bloch
Siemens ICN
phone (561) 923-6550
e-mail jack.bloch@icn.siemens.com
^ permalink raw reply [flat|nested] 6+ messages in thread
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