Re: [PATCH -tip v8 10/13] x86/kprobes: Push a fake return address at kretprobe_trampoline
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- To: Ingo Molnar <mingo@xxxxxxxxxx>
- Subject: Re: [PATCH -tip v8 10/13] x86/kprobes: Push a fake return address at kretprobe_trampoline
- From: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
- Date: Fri, 9 Jul 2021 23:55:31 +0900
- Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>, Josh Poimboeuf <jpoimboe@xxxxxxxxxx>, X86 ML <x86@xxxxxxxxxx>, Daniel Xu <dxu@xxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, bpf@xxxxxxxxxxxxxxx, kuba@xxxxxxxxxx, mingo@xxxxxxxxxx, ast@xxxxxxxxxx, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, kernel-team@xxxxxx, yhs@xxxxxx, linux-ia64@xxxxxxxxxxxxxxx, Abhishek Sagar <sagar.abhishek@xxxxxxxxx>, Andrii Nakryiko <andrii.nakryiko@xxxxxxxxx>
- In-reply-to: <YOLAFswnvyNReMmI@gmail.com>
- References: <162399992186.506599.8457763707951687195.stgit@devnote2> <162400001661.506599.5153975410607447958.stgit@devnote2> <YOLAFswnvyNReMmI@gmail.com>
On Mon, 5 Jul 2021 10:17:26 +0200
Ingo Molnar <mingo@xxxxxxxxxx> wrote:
>
> * Masami Hiramatsu <mhiramat@xxxxxxxxxx> wrote:
>
> > + /* Replace fake return address with real one. */
> > + *frame_pointer = kretprobe_trampoline_handler(regs, frame_pointer);
> > + /*
> > + * Move flags to sp so that kretprobe_trapmoline can return
> > + * right after popf.
>
> What is a trapmoline?
This means kretprobe_trampoline() code.
>
> Also, in the x86 code we capitalize register and instruction names so that
> they are more distinctive and easier to read in the flow of English text.
OK, let me update it.
Thank you,
>
> Thanks,
>
> Ingo
--
Masami Hiramatsu <mhiramat@xxxxxxxxxx>
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