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[Bug binutils/28689] p_align in ELF program headers should not exceed se


From: hjl.tools at gmail dot com
Subject: [Bug binutils/28689] p_align in ELF program headers should not exceed section alignment
Date: Tue, 14 Dec 2021 14:14:14 +0000

https://sourceware.org/bugzilla/show_bug.cgi?id=28689

--- Comment #6 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Fangrui Song from comment #5)
> (In reply to Fangrui Song from comment #4)
> > (In reply to H.J. Lu from comment #2)
> > > One problem:
> > > [...]
> > > File offsets are changed.
> > 
> > For objcopy, it is important to not transform the file to decrease the
> > intrinsic max-page-size. This would make the output not runnable on the
> > originally supported systems.
> > 
> > If ld decreases p_align to reduce wasted memory pages, can you describe how
> > the objcopy problem (inferring max-page-size) will be solved?
> > Note that max-page-size can be trick to infer in the -z noseparate-code 
> > case.
> 
> Maybe something like gcd({p_vaddr - p_offset}). If the gcd is 0, pick p_align

This is roughly what my patch does.

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