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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

  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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