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Message-ID: <CAJnvVWVHAN=+dQwBOWPgJFkj3=G=cr9tkUgMpBB_GTMB-EE4dA@mail.gmail.com>
Date: Sat, 9 Jun 2012 02:21:39 +0300
From: Ivan Kanakarakis <ivan.kanak@...il.com>
To: musl@...ts.openwall.com
Subject: Re: _GLOBAL_OFFSET_TABLE_ in ldso/*/start.s?
many online books out there, people tend
to like "Pro Git" [0] that was merged with
the community git book and "git ready" [1]
[0]: http://git-scm.com/book
[1]: http://gitready.com/
very simple stuff to get you started
looking at changes, would be:
$ git clone git://git.etalabs.net/musl
$ cd musl
# see the history for the repo
$ git log
# see the history for a file
$ git log -- Makefile
# see only the last 5 commits/changes to a file by line
$ git log -5 --oneline -- WHATSNEW
# see diff between current state and a commit/point in the past
$ git diff 2d3e2a7
# see diff between two states
$ git diff 8a35dee 2d3e2a7
# show info (message and diff from its previous state) about a commit/change
$ git show 83023d1
On 9 June 2012 01:43, Richard Pennington <rich@...nware.com> wrote:
> Thanks Rich. Becoming familiar with git is definitely on my todo list.
>
> -Rich
>
> Sent from my iPhone
>
> On Jun 8, 2012, at 5:31 PM, Rich Felker <dalias@...ifal.cx> wrote:
>
> > On Fri, Jun 08, 2012 at 03:54:46PM -0500, Richard Pennington wrote:
> >> What is the purpose of the _GLOBAL_OFFSET_TABLE_ reference in these
> files? It
> >> doesn't seem to be used by __dynlink(), although it seems to be passed
> a a
> >> third parameter.
> >
> > If you check git, you'll see that this code was removed. A much older
> > version of __dynlink took a third argument that was the base address
> > of the GOT, which was used to find a pointer to _DYNAMIC in the first
> > GOT slot (traditionally, it was stored there). Then people started
> > reporting crashes when linking with a non-binutils linker (gold? or
> > something from clang/llvm? I don't remember...) that didn't follow
> > this practice, so I replaced it with more elaborate code to find
> > _DYNAMIC. The unneeded code in the asm was not removed until much
> > later. I actually have a new idea for simplifying/replacing some of
> > the C code, but it won't affect the asm.
> >
> > By the way, it might be a good idea to familiarize yourself with git
> > or even the gitweb interface. Questions like the one you had just now
> > can usually be answered quickly by checking the history of the
> > relevant files.
> >
> > Rich
>
--
*Ivan c00kiemon5ter V Kanakarakis* >:3
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