On Wed, 28 Oct 2020 11:29:16 -0400
Steven Rostedt wrote:
> Hi Masami,
>
> Talking with Peter and Thomas on IRC, where they really don't like
> passing a partial pt_regs around, got me thinking of redoing the REGS
> parameter of ftrace. Kprobes is the only user that requires the full
> registers
>From b5f5cfc63f38415b4ca7eb4cfb8c78113bfa17e0 Mon Sep 17 00:00:00 2001
From: "Steven Rostedt (VMware)"
Date: Tue, 27 Oct 2020 10:55:55 -0400
Subject: [PATCH] ftrace/x86: Allow for arguments to be passed in to REGS by
default
Currently, the only way to get access to the registers of a function
Hi Masami,
Talking with Peter and Thomas on IRC, where they really don't like
passing a partial pt_regs around, got me thinking of redoing the REGS
parameter of ftrace. Kprobes is the only user that requires the full
registers being saved, and that's only because some kprobe user might
want them.
On Wed, 28 Oct 2020 16:36:26 -0400
Steven Rostedt wrote:
> Here's a proof of concept patch. It passes all the kprobe self tests in
> the ftracetest suite. This is just a proof of concept, and I already
> know of a couple of subtle bugs that are easy to fix. But this shows
> the general idea.
On Wed, 28 Oct 2020 11:29:16 -0400
Steven Rostedt wrote:
> Then kprobes could just create its own pt_regs, fill in all the data
> from ftrace_regs and then fill the rest with zeros or possibly whatever
> the values currently are (does it really matter what those registers
> are?), including
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