linux-kernel - Re: [PATCH v3 18/39] x86/ibt,ftrace: Make function-graph play nice

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Message-ID: <20220304175154.l2otvmqd4r7ozsuy@treble>
Date:   Fri, 4 Mar 2022 09:51:54 -0800
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     x86@...nel.org, joao@...rdrivepizza.com, hjl.tools@...il.com,
        andrew.cooper3@...rix.com, linux-kernel@...r.kernel.org,
        ndesaulniers@...gle.com, keescook@...omium.org,
        samitolvanen@...gle.com, mark.rutland@....com,
        alyssa.milburn@...el.com, mbenes@...e.cz, rostedt@...dmis.org,
        mhiramat@...nel.org, alexei.starovoitov@...il.com
Subject: Re: [PATCH v3 18/39] x86/ibt,ftrace: Make function-graph play nice

On Thu, Mar 03, 2022 at 12:23:39PM +0100, Peter Zijlstra wrote:
> +
> +	addq $16, %rsp
> +	ANNOTATE_INTRA_FUNCTION_CALL
> +	call .Ldo_rop
> +	int3
> +.Ldo_rop:
> +	mov %rdi, (%rsp)
> +	UNWIND_HINT_FUNC
> +	RET

Why the int3?

-- 
Josh