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Re: [Libunwind-devel] Bug fixes in libunwind git = make another "release

From: Paul Pluzhnikov
Subject: Re: [Libunwind-devel] Bug fixes in libunwind git = make another "release"?
Date: Wed, 23 Mar 2011 15:00:22 -0700

On Wed, Mar 23, 2011 at 1:47 PM, Joe Damato <address@hidden> wrote:

>> 2. For prelinked libraries, the _r_debug.r_map list does not give you
>>   access to the info you need: l_map->l_addr becomes 0 for all images
>>   that are loaded at their desired address!
> l_addr is the difference between the on disk address in PT_LOAD and
> the in memory address of the library.


> AFAIK, you will have to parse
> some of the headers of the library (on disk)

You don't suggest we do that during the unwind, do you?

Going to disk during dl_debug_state is possible, but less than ideal.

> to figure out the base load address. there's no way around that.

Sure there is.

Glibc has that info, and dl_iterate_phdr uses it without going to disk. It's
too bad glibc considers that info private and none of our business.

Paul Pluzhnikov

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