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Re: Using linker script assignments in shared object
- From: Alan Modra <amodra at gmail dot com>
- To: Max Dmitrichenko <dmitrmax at gmail dot com>
- Cc: binutils at sourceware dot org
- Date: Wed, 28 May 2014 23:41:52 +0930
- Subject: Re: Using linker script assignments in shared object
- Authentication-results: sourceware.org; auth=none
- References: <CAMRqRqyTbGY60374hnVoc6PhLkWDNNd-1K2WwQ1WS=DFDMPtmQ at mail dot gmail dot com>
On Wed, May 28, 2014 at 05:29:26PM +0400, Max Dmitrichenko wrote:
> But when I paste this code into shared object then I got some address
> in the middle of memory address space. Though readelf outputs
> following for this symbol:
> 552: 0000000000000005 0 NOTYPE LOCAL HIDDEN ABS test_ls_value
This isn't a problem with ld, but with the dynamic loader ld.so.
ld.so shouldn't relocate absolute symbols but does, because some
ancient linkers made symbols like _GLOBAL_OFFSET_TABLE_ absolute, and
GNU ld followed this bad practise. It's not impossible to fix in a
way that keeps backward compatibility (eg. bump EI_ABIVERSION to
indicate to ld.so that absolute symbols really are absolute), but no
one has cared enough to do the glibc and ld work required.
Australia Development Lab, IBM