linux-kernel - Re: [PATCH 05/29] x86: Base IBT bits

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Message-ID: <YhANx8ysGKXWBD3B@hirez.programming.kicks-ass.net>
Date:   Fri, 18 Feb 2022 22:21:11 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
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
Subject: Re: [PATCH 05/29] x86: Base IBT bits

On Fri, Feb 18, 2022 at 01:14:51PM -0800, Josh Poimboeuf wrote:
> On Fri, Feb 18, 2022 at 05:49:07PM +0100, Peter Zijlstra wrote:
> > +#ifdef CONFIG_X86_64
> > +#define ASM_ENDBR	"endbr64\n\t"
> > +#else
> > +#define ASM_ENDBR	"endbr32\n\t"
> > +#endif
> 
> Is it safe to assume all supported assemblers know this instruction?

I was hoping the answer was yes, given CC_HAS_IBT.