From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ian Lance Taylor <ian@zembu.com>
To: devans@cygnus.com
Cc: bfd@cygnus.com
Subject: Re: arm questions
Date: Thu, 15 Apr 1999 11:01:00 -0000
Message-id: <19990415180136.2600.qmail@daffy.airs.com>
References: <199904151738.KAA02138@canuck.cygnus.com.> <199904151738.KAA02138@canuck.cygnus.com.>
X-SW-Source: 1999/msg00085.html

   Date: Thu, 15 Apr 1999 10:38:25 -0700
   From: Doug Evans <devans@cygnus.com>

   Two random questions.

   1)
   elfarm-oabi.c uses USE_RELA
   elfarm-nabi.c uses USE_REL
   That seems rather backwards, doesn't it?
   I'd expect a new version of an abi to switch from USE_REL to USE_RELA,
   but not the other way around.
   [not that it can be changed, but rather ... why the switch?]

This is my understanding of the situation.  If anybody knows that I am
wrong, please correct me.

The ARM ELF situation is a mess because there were two separate
implementations.

Some folks in England put together ARM GNU/Linux, but they took a very
long time to get the copyright stuff done.  For some reason that I do
not know, that implementation used REL rather than RELA relocs.

In the meantime, Cygnus implemented ARM ELF, using RELA relocs.

It's obviously desirable to have a single ARM ELF ABI, and the best
choice is probably the one currently being used for GNU/Linux.
Therefore, when we straightened out the copyright situation, we dumped
the Cygnus RELA implementation in favour of the GNU/Linux REL
implementation.

   2)
   Whats the R_ARM_THM_XPC22 reloc for?

I dunno.  Philip Blundell is on the list.  Phil, do you know?

Ian