From: Jiri Kosina <jikos@kernel.org>
To: "H.J. Lu" <hjl.tools@gmail.com>
Cc: Andy Lutomirski <luto@kernel.org>,
Josh Poimboeuf <jpoimboe@redhat.com>,
"H. Peter Anvin" <hpa@zytor.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Jiri Slaby <jslaby@suse.cz>,
Andrew Morton <akpm@linux-foundation.org>,
live-patching@vger.kernel.org,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>,
the arch/x86 maintainers <x86@kernel.org>,
Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: [PATCH 7/7] DWARF: add the config option
Date: Mon, 22 May 2017 13:34:24 +0200 (CEST) [thread overview]
Message-ID: <alpine.LSU.2.20.1705221333150.26873@cbobk.fhfr.pm> (raw)
In-Reply-To: <CAMe9rOoAuqhY_+G=8Dwrt6aJ7YXTwcHShxLEVzt6MeNYAhT9PA@mail.gmail.com>
On Sat, 20 May 2017, H.J. Lu wrote:
> >>>> pushq %whatever
> >>>> .cfi_adjust_sp -8
> >>>> ...
> >>>> popq %whatever
> >>>> .cfi_adjust_sp 8
> >>>>
> >>
> >> Np. Compiler needs to generate this.
> >>
> >
> > How would the compiler generate this when inline asm is involved? For
> > the kernel, objtool could get around the need to have these
> > annotations, but not so much for user code? Is the compiler supposed
> > to parse the inline asm? Would the compiler provide some magic % code
> > to represent the current CFA base register?
>
> Here is one example of inline asm with call frame info:
>
> https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/unix/sysv/linux/x86_64/sigaction.c;h=be058bac436d1cc9794b2b03107676ed99f6b872;hb=HEAD
That brings us basically pretty close to square one though; having to
maintain "manual" anotations. Something we're pretty much trying to avoid
through this excercise.
--
Jiri Kosina
SUSE Labs
next prev parent reply other threads:[~2017-05-22 11:34 UTC|newest]
Thread overview: 70+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-05 12:21 [PATCH 1/7] DWARF: add option to preserve unwind info Jiri Slaby
2017-05-05 12:21 ` [PATCH 2/7] DWARF: EH-frame based stack unwinding Jiri Slaby
2017-05-05 12:21 ` [PATCH 3/7] vmlinux.lds: preserve eh_frame for DWARF unwinder Jiri Slaby
2017-05-05 12:21 ` [PATCH 4/7] DWARF: initialize structures for kernel and modules Jiri Slaby
2017-05-05 12:21 ` [PATCH 5/7] unwinder: show_stack, check also ret_addr_p's contents Jiri Slaby
2017-05-05 12:21 ` [PATCH 6/7] unwinder: plug in the DWARF unwinder Jiri Slaby
2017-05-05 12:22 ` [PATCH 7/7] DWARF: add the config option Jiri Slaby
2017-05-05 19:57 ` Linus Torvalds
2017-05-06 7:19 ` Ingo Molnar
2017-05-10 7:46 ` Jiri Slaby
2017-05-06 14:24 ` Jiri Kosina
2017-05-07 16:55 ` Josh Poimboeuf
2017-05-07 17:59 ` Ingo Molnar
2017-05-07 18:08 ` hpa
2017-05-07 21:48 ` Josh Poimboeuf
2017-05-08 7:50 ` Vojtech Pavlik
2017-05-08 13:14 ` Josh Poimboeuf
2017-05-08 5:35 ` Andy Lutomirski
2017-05-08 6:15 ` Ingo Molnar
2017-05-08 14:40 ` Josh Poimboeuf
2017-05-08 18:57 ` hpa
2017-05-09 0:21 ` Andy Lutomirski
2017-05-09 1:38 ` Josh Poimboeuf
2017-05-09 2:31 ` Andy Lutomirski
2017-05-09 3:38 ` Josh Poimboeuf
2017-05-09 10:00 ` hpa
2017-05-09 14:58 ` Josh Poimboeuf
2017-05-09 16:46 ` H.J. Lu
2017-05-10 8:15 ` Jiri Slaby
2017-05-10 13:09 ` Josh Poimboeuf
2017-05-10 16:23 ` H.J. Lu
2017-05-09 18:47 ` Jiri Kosina
2017-05-09 19:22 ` Josh Poimboeuf
2017-05-10 8:32 ` Jiri Slaby
2017-05-10 13:13 ` Josh Poimboeuf
2017-05-23 7:07 ` Peter Zijlstra
2017-05-23 7:27 ` Ingo Molnar
2017-05-19 20:53 ` Josh Poimboeuf
2017-05-19 20:57 ` H. Peter Anvin
2017-05-19 20:59 ` H. Peter Anvin
2017-05-19 21:29 ` Josh Poimboeuf
2017-05-19 21:35 ` Josh Poimboeuf
2017-05-20 5:23 ` Andy Lutomirski
2017-05-20 16:20 ` Josh Poimboeuf
2017-05-20 17:19 ` Josh Poimboeuf
2017-05-20 20:01 ` H.J. Lu
2017-05-20 21:58 ` Andy Lutomirski
2017-05-20 22:20 ` H.J. Lu
2017-05-22 11:34 ` Jiri Kosina [this message]
2017-05-22 14:39 ` H.J. Lu
2017-05-22 21:07 ` H. Peter Anvin
2017-05-22 21:37 ` H. Peter Anvin
2017-05-22 22:11 ` Josh Poimboeuf
2017-05-20 20:16 ` Linus Torvalds
2017-05-20 21:56 ` Andy Lutomirski
2017-05-20 23:00 ` Linus Torvalds
2017-05-20 23:29 ` Linus Torvalds
2017-05-26 6:54 ` Jiri Slaby
2017-05-26 11:29 ` Jiri Slaby
2017-05-26 12:14 ` Josh Poimboeuf
2017-05-22 11:12 ` Ingo Molnar
2017-05-22 21:16 ` H. Peter Anvin
2017-05-22 23:23 ` Jiri Kosina
2017-05-23 5:49 ` Ingo Molnar
2017-05-26 19:16 ` hpa
2017-05-28 9:12 ` Ingo Molnar
2017-05-10 7:39 ` Jiri Slaby
2017-05-10 12:42 ` Josh Poimboeuf
2017-05-10 12:47 ` Jiri Slaby
2017-05-10 18:11 ` Linus Torvalds
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