From: Alexander Monakov <amonakov@ispras.ru>
To: musl@lists.openwall.com
Subject: Re: possible bug in setjmp implementation for ppc64
Date: Tue, 1 Aug 2017 08:28:27 +0300 (MSK) [thread overview]
Message-ID: <alpine.LNX.2.20.13.1708010821580.2270@monopod.intra.ispras.ru> (raw)
In-Reply-To: <20170801051042.GA14914@dora.lan>
On Tue, 1 Aug 2017, Bobby Bingham wrote:
> I think this either requires having different versions of setjmp/longjmp
> for static and dynamic libc,
Do you mean for non-pic vs pic objects? As I understand, when libc.a is
built with -fpic (so it's suitable for static-pie), setjmp-longjmp need
to preserve saved TOC at (r1+24). So presumably source code would need
to test #ifdef __PIC__?
> or to increase the size of jmpbuf so we can always save/restore both
> r2 and the value on the stack, but this would be an ABI change.
Would that work for non-pic, i.e. is (r1+24) a reserved location even in
non-pic mode? If not, you can't overwrite it from longjmp.
Alexander
next prev parent reply other threads:[~2017-08-01 5:28 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-31 20:06 felix.winkelmann
2017-07-31 20:30 ` Rich Felker
2017-08-01 5:10 ` Bobby Bingham
2017-08-01 5:28 ` Alexander Monakov [this message]
2017-08-01 22:45 ` Rich Felker
2017-08-01 23:07 ` Rich Felker
2017-08-02 0:28 ` Bobby Bingham
2017-08-02 3:55 ` Rich Felker
2017-08-02 4:31 ` Bobby Bingham
2017-08-02 4:58 ` Rich Felker
2017-08-02 13:38 ` Bobby Bingham
2017-08-02 14:46 ` Rich Felker
2017-08-03 0:19 ` Bobby Bingham
2017-08-01 15:33 ` David Edelsohn
2017-08-02 23:00 ` Alexander Monakov
2017-08-02 23:02 ` Rich Felker
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