# Re: \[PATCH v22 8/8\] x86/vdso: Add ENDBR64 to \_\_vdso\_sgx\_enter\_enclave

- From: Borislav Petkov \<bp@alien8.de\>
- Date: 2021-03-10 23:18:36 
- List: linux-doc
- Page: https://ratatoskr.run/linux-doc/2021/03/6295999
- Thread: https://ratatoskr.run/linux-doc/2021/03/6295910/t.md

```text
On Wed, Mar 10, 2021 at 02:55:55PM -0800, Yu, Yu-cheng wrote:
> > > @@ -27,6 +27,9 @@
> > >   SYM_FUNC_START(__vdso_sgx_enter_enclave)
> > >   	/* Prolog */
> > >   	.cfi_startproc
> > > +#ifdef CONFIG_X86_CET
> > > +	endbr64
> > > +#endif

You can hide this ifdeffery in a macro and have

	ENDBR64

at the callsite and define

.macro ENDBR64
#ifdef CONFIG_X86_CET
	endbr64
#endif
.endm

or so, perhaps. Ditto for endbr32.

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette
```