On 16.02.2024 11:50, Frediano Ziglio wrote:
> --- a/xen/arch/x86/x86_64/entry.S
> +++ b/xen/arch/x86/x86_64/entry.S
> @@ -22,6 +22,14 @@
> #endif
> .endm
>
> +.macro BUILD_BUG_ON condstr cond:vararg
> +.if \cond
> +.error "Condition \condstr not satisfied"
Maybe
On many entries we push 8-bytes zero and exception constants are
small so we can just write a single byte saving 3 bytes for
instruction.
With ENDBR64 this reduces the size of many entry points from 32 to
16 bytes (due to alignment).
The push and the mov are overlapping stores either way.
