linux-kernel - Re: [PATCH 2/4] x86/kprobes: Fix frame pointer annotations

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Message-ID: <20190508153907.GM2589@hirez.programming.kicks-ass.net>
Date:   Wed, 8 May 2019 17:39:07 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     linux-kernel@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andy Lutomirski <luto@...nel.org>,
        Nicolai Stange <nstange@...e.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Jiri Kosina <jikos@...nel.org>,
        Miroslav Benes <mbenes@...e.cz>,
        Petr Mladek <pmladek@...e.com>,
        Joe Lawrence <joe.lawrence@...hat.com>,
        Shuah Khan <shuah@...nel.org>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Mimi Zohar <zohar@...ux.ibm.com>,
        Juergen Gross <jgross@...e.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nayna Jain <nayna@...ux.ibm.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Joerg Roedel <jroedel@...e.de>,
        linux-kselftest@...r.kernel.org,
        Masami Hiramatsu <mhiramat@...nel.org>
Subject: Re: [PATCH 2/4] x86/kprobes: Fix frame pointer annotations

On Wed, May 08, 2019 at 07:42:48AM -0500, Josh Poimboeuf wrote:
> On Wed, May 08, 2019 at 02:04:16PM +0200, Peter Zijlstra wrote:

> > Do the x86_64 variants also want some ORC annotation?
> 
> Maybe so.  Though it looks like regs->ip isn't saved.  The saved
> registers might need to be tweaked.  I'll need to look into it.

What all these sites do (and maybe we should look at unifying them
somehow) is turn a CALL frame (aka RET-IP) into an exception frame (aka
pt_regs).

So regs->ip will be the return address (which is fixed up to be the CALL
address in the handler).