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Re: [Tinycc-devel] x86_64: shared libs

From: Michael Matz
Subject: Re: [Tinycc-devel] x86_64: shared libs
Date: Fri, 4 Apr 2014 21:09:58 +0200 (CEST)
User-agent: Alpine 2.00 (LNX 1167 2008-08-23)


On Fri, 4 Apr 2014, grischka wrote:

Question apropos:

On linux x86_64 there is still the ugly
hack which is a replacement for PLT in the "tcc -run" case
to forward 32bit calls to extern libraries.

On win64 the same problem is solved by building the IAT
(import address table) also in the -run case.

From your estimation, would it be possible to do the same on ELF?
That is build the PLT/GOT as if we were making an executable and
then use that with tcc -run?

Yes, that's something on my TODO. Theoretically having runtime_plt_and_got makes code emission a tiny bit faster because having a proper PLT and GOT also for -run means first creating and second applying intermediate relocations (the _GLOB_DAT and _JUMP_SLOT relocs), which is cut short with the hack. OTOH removing the hack would remove deviation depending on output type, so I think it's a good idea nevertheless.


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