From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
To: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Xenomai <xenomai@xenomai.org>
Subject: Re: [Xenomai] [RFC] Consolidated exception prologue/epiloge for x86 and ARM
Date: Fri, 27 Feb 2015 22:21:30 +0100 [thread overview]
Message-ID: <20150227212130.GP434@hermes.click-hack.org> (raw)
In-Reply-To: <54F0D599.8090009@siemens.com>
On Fri, Feb 27, 2015 at 09:37:45PM +0100, Jan Kiszka wrote:
> On 2015-02-27 21:27, Gilles Chanteperdrix wrote:
> > On Fri, Feb 27, 2015 at 09:12:14PM +0100, Jan Kiszka wrote:
> >> Hi,
> >>
> >> just pushed a first implementation of the general model that I proposed
> >> for exception handling. You can find it at
> >>
> >> http://git.xenomai.org/ipipe-jki.git/log/?h=queues/trap-rework
> >
> > Also, the clean way to pass virtual + physical flags is to use
> > arch_mangle_bits. Using two longs (potentially 128 bits then) is
> > completely useless since one of the longs simply has one significant
> > bit.
>
> The costs of mangling is higher than using two regs for passing that
> data as-is, both binary and LOC-wise (tried it). Plus the code is more
> readable.
That is false on ARM. On ARM gcc does not pass structs by values in
registers. The values get passed on stack.
--
Gilles.
next prev parent reply other threads:[~2015-02-27 21:21 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-02-27 20:12 [Xenomai] [RFC] Consolidated exception prologue/epiloge for x86 and ARM Jan Kiszka
2015-02-27 20:24 ` Gilles Chanteperdrix
2015-02-27 20:37 ` Jan Kiszka
2015-02-27 20:39 ` Gilles Chanteperdrix
2015-02-27 20:47 ` Jan Kiszka
2015-02-27 20:50 ` Gilles Chanteperdrix
2015-03-02 17:40 ` Jan Kiszka
2015-03-02 17:42 ` Gilles Chanteperdrix
2015-02-27 20:27 ` Gilles Chanteperdrix
2015-02-27 20:37 ` Jan Kiszka
2015-02-27 21:21 ` Gilles Chanteperdrix [this message]
2015-02-27 21:24 ` Gilles Chanteperdrix
2015-03-02 17:39 ` Jan Kiszka
2015-03-02 17:41 ` Gilles Chanteperdrix
2015-03-02 17:45 ` Jan Kiszka
2015-03-02 17:47 ` Gilles Chanteperdrix
2015-03-02 17:49 ` Jan Kiszka
2015-03-02 17:53 ` Gilles Chanteperdrix
2015-03-02 18:53 ` Philippe Gerum
2015-03-02 19:17 ` Jan Kiszka
2015-03-02 20:31 ` Jan Kiszka
2015-03-03 14:26 ` Philippe Gerum
2015-03-03 14:34 ` Philippe Gerum
2015-03-03 8:31 ` Philippe Gerum
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