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Date: Fri, 9 Aug 2019 12:30:21 -0400
From: Rich Felker <dalias@...c.org>
To: musl@...ts.openwall.com
Subject: Re: [RFC] final time64 switch-over patch series

On Sun, Aug 04, 2019 at 12:31:09AM -0400, Rich Felker wrote:
> On Fri, Aug 02, 2019 at 05:44:33PM -0400, Rich Felker wrote:
> > >From 3c6bde03ecf2aa7dac605f0a55a1be201f3d4c5f Mon Sep 17 00:00:00 2001
> > From: Rich Felker <dalias@...ifal.cx>
> > Date: Fri, 2 Aug 2019 15:41:27 -0400
> > Subject: [PATCH 5/5] [RFC] [POC] switch i386 to 64-bit time_t
> > 
> > this is a proof of concept for converting one 32-bit arch, i386, to
> > 64-bit time_t. known issues:
> > 
> > 1. the switchover of timespec padding is a hack, and needs to be done
> > right, but that involves making alltypes.h aware of endianness, which
> > probably should have been done a long time ago anyway and would get
> > rid of inappropriate inclusion of <endian.h> in some places.
> > 
> > 2. the rusage, utmpx, and timex structs are not correct with regard to
> > ABI or functionality. they need to be fixed before this is safe to
> > use.
> > 
> > 3. Makefile change should be its own thing.
> > 
> > there are likely a lot more problems.
> 
> Add a significant incomplete prerequisite I forgot about: dlsym. There
> needs to be a redirection for dlsym, and 32-bit archs need a second
> asm entry point for __dlsym_time64 which first checks the symbol name
> against the list of time64 redirections and rewrites the request if
> it's a match.

For reference, here's the first draft of the redirection. The worst
part of it is the large relro string table.

Rich

View attachment "dlsym_redir_time64.c" of type "text/plain" (3035 bytes)

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