[PATCH] ld: Default the maximum page size to the common page size for -z separate-code

H.J. Lu hjl.tools@gmail.com
Fri Jan 12 11:39:00 GMT 2018


On Thu, Jan 11, 2018 at 9:55 PM, Alan Modra <amodra@gmail.com> wrote:
> On Thu, Jan 11, 2018 at 09:13:19PM -0800, H.J. Lu wrote:
>> When -z separate-code is used, code segment is aligned and padded to
>> the maximum page size on disk.  This patch defaults the maximum page
>> size to the common page size for -z separate-code to reduce file size.
>
> I think this is a bad idea.  Options should have as few magical
> side-effects as possible.  If you want -z separate-code to align to
> common-page-size, then do that in the script (and document in
> ld.texinfo that code separation is only effective for system page size
> up to common-page-size, like -z relro).
>

RELRO segment is optional.  Ignoring it at run-time won't crash
the program.

How about adding ELF_MAXCODEPAGESIZE which defaults to
ELF_COMMONPAGESIZE and -z max-code-page-size?


-- 
H.J.



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