From: Ingo Molnar <mingo@kernel.org>
To: Segher Boessenkool <segher@kernel.crashing.org>
Cc: Borislav Petkov <bp@alien8.de>,
gcc@gcc.gnu.org, Richard Biener <rguenther@suse.de>,
Michael Matz <matz@suse.de>, Nadav Amit <namit@vmware.com>,
Ingo Molnar <mingo@redhat.com>,
linux-kernel@vger.kernel.org, x86@kernel.org,
Masahiro Yamada <yamada.masahiro@socionext.com>,
Sam Ravnborg <sam@ravnborg.org>,
Alok Kataria <akataria@vmware.com>,
Christopher Li <sparse@chrisli.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"H. Peter Anvin" <hpa@zytor.com>, Jan Beulich <JBeulich@suse.com>,
Josh Poimboeuf <jpoimboe@redhat.com>,
Juergen Gross <jgross@suse.com>,
Kate Stewart <kstewart@linuxfoundation.org>,
Kees Cook <keescook@chromium.org>,
linux-sparse@vger.kernel.org,
Peter Zijlstra <peterz@infradead.org>,
Philippe Ombredanne <pombredanne@nexb.com>,
Th
Subject: Re: PROPOSAL: Extend inline asm syntax with size spec
Date: Mon, 8 Oct 2018 07:58:38 +0200 [thread overview]
Message-ID: <20181008055838.GA66819@gmail.com> (raw)
In-Reply-To: <20181007151427.GK29268@gate.crashing.org>
* Segher Boessenkool <segher@kernel.crashing.org> wrote:
> > > More precise *size* estimates, yes. And if the user lies he should not
> > > be surprised to get assembler errors, etc.
> >
> > Yes.
> >
> > Another option would be if gcc parses the inline asm directly and
> > does a more precise size estimation. Which is a lot more involved and
> > complicated solution so I guess we wanna look at the simpler ones first.
> >
> > :-)
>
> Which is *impossible* to do. Inline assembler is free-form text.
"Impossible" is false: only under GCC's model and semantics of inline
asm that is, and only under the (false) assumption that the semantics
of the asm statement (which is a GCC extension to begin with) cannot
be changed like it has been changed multiple times in the past.
"Difficult", "not worth our while", perhaps.
Thanks,
Ingo
next prev parent reply other threads:[~2018-10-08 5:58 UTC|newest]
Thread overview: 85+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-03 21:30 [PATCH v9 00/10] x86: macrofying inline asm Nadav Amit
2018-10-03 21:30 ` [PATCH v9 02/10] Makefile: Prepare for using macros for " Nadav Amit
2018-11-06 18:57 ` Logan Gunthorpe
2018-11-06 19:18 ` Nadav Amit
2018-11-06 20:01 ` Logan Gunthorpe
2018-11-07 18:01 ` Nadav Amit
2018-11-07 18:53 ` Logan Gunthorpe
2018-11-07 18:56 ` Nadav Amit
2018-11-07 21:43 ` Logan Gunthorpe
2018-11-07 21:50 ` hpa
2018-11-08 6:18 ` Nadav Amit
2018-11-08 17:14 ` Logan Gunthorpe
2018-11-08 19:54 ` Nadav Amit
2018-11-08 20:00 ` Logan Gunthorpe
2018-11-08 20:18 ` Nadav Amit
2018-11-10 22:04 ` Nadav Amit
2018-11-13 4:56 ` Logan Gunthorpe
2018-10-03 21:30 ` [PATCH v9 03/10] x86: objtool: use asm macro for better compiler decisions Nadav Amit
2018-10-07 9:18 ` PROPOSAL: Extend inline asm syntax with size spec Borislav Petkov
2018-10-07 9:18 ` Borislav Petkov
2018-10-07 13:22 ` Segher Boessenkool
2018-10-07 14:13 ` Borislav Petkov
2018-10-07 14:13 ` Borislav Petkov
2018-10-07 15:14 ` Segher Boessenkool
2018-10-08 5:58 ` Ingo Molnar [this message]
2018-10-08 7:53 ` Segher Boessenkool
2018-10-08 5:58 ` Ingo Molnar
2018-10-07 15:53 ` Michael Matz
2018-10-08 6:13 ` Ingo Molnar
2018-10-08 8:18 ` Segher Boessenkool
2018-10-08 7:31 ` Segher Boessenkool
2018-10-08 9:07 ` Richard Biener
2018-10-08 10:02 ` Segher Boessenkool
2018-10-09 14:53 ` Segher Boessenkool
2018-10-10 6:35 ` Ingo Molnar
2018-10-10 7:12 ` Richard Biener
2018-10-10 7:22 ` Ingo Molnar
2018-10-10 8:03 ` Segher Boessenkool
2018-10-10 8:19 ` Borislav Petkov
2018-10-10 8:19 ` Borislav Petkov
2018-10-10 8:35 ` Richard Biener
2018-10-10 18:54 ` Segher Boessenkool
2018-10-10 19:14 ` Borislav Petkov
2018-10-13 19:33 ` Borislav Petkov
2018-10-13 21:14 ` Alexander Monakov
2018-10-13 21:30 ` Borislav Petkov
2018-10-25 10:24 ` Borislav Petkov
2018-10-25 10:24 ` Borislav Petkov
2018-10-31 12:55 ` Peter Zijlstra
2018-10-31 13:11 ` Peter Zijlstra
2018-10-31 16:31 ` Segher Boessenkool
2018-11-01 5:20 ` Joe Perches
2018-11-01 9:01 ` Peter Zijlstra
2018-11-01 9:20 ` Joe Perches
2018-11-01 11:15 ` Peter Zijlstra
2018-11-01 9:20 ` Joe Perches
2018-11-01 5:20 ` Joe Perches
2018-12-27 4:47 ` Masahiro Yamada
2018-10-10 19:14 ` Borislav Petkov
2018-10-10 10:29 ` Richard Biener
2018-10-10 7:53 ` Segher Boessenkool
2018-10-10 16:31 ` Nadav Amit
2018-10-10 19:21 ` Segher Boessenkool
2018-10-11 7:04 ` Richard Biener
2018-11-29 11:46 ` Masahiro Yamada
2018-11-29 12:25 ` Segher Boessenkool
2018-11-30 9:06 ` Boris Petkov
2018-11-30 13:16 ` Segher Boessenkool
2018-12-10 8:16 ` Masahiro Yamada
2018-12-10 8:16 ` Masahiro Yamada
2018-11-30 9:06 ` Boris Petkov via Virtualization
2018-11-29 13:07 ` Borislav Petkov via Virtualization
2018-11-29 13:09 ` Richard Biener
2018-11-29 13:16 ` Borislav Petkov
2018-11-29 13:24 ` Richard Biener
2018-11-29 13:16 ` Borislav Petkov via Virtualization
2018-11-29 11:46 ` Masahiro Yamada
2018-10-08 16:24 ` David Laight
2018-10-08 16:24 ` David Laight
2018-10-07 16:09 ` Nadav Amit
2018-10-07 16:13 ` [RESEND] " Nadav Amit
2018-10-07 16:46 ` Richard Biener
2018-10-07 19:06 ` Nadav Amit
2018-10-07 19:52 ` Jeff Law
2018-10-08 7:46 ` Richard Biener
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