Re: [PATCH v1 2/3] x86: Modify ENTRY in sysdep.h so that p2align can be specified

[Noah Goldstein <goldstein.w.n@gmail.com>]

On Sun, Sep 26, 2021 at 3:53 PM Noah Goldstein <goldstein.w.n@gmail.com>
wrote:

> No bug.
>
> This change adds a new macro ENTRY_P2ALIGN which takes a second
> argument, log2 of the desired function alignment.
>
> The old ENTRY(name) macro is just ENTRY_P2ALIGN(name, 4) so this
> doesn't affect any existing functionality.
>
> Signed-off-by: Noah Goldstein <goldstein.w.n@gmail.com>
> ---
> Note this is a duplicate of:
> [v2,1/2] x86: Modify ENTRY in sysdep.h so that p2align can be specified
>
> https://patchwork.sourceware.org/project/glibc/patch/20210922051657.1655745-1-goldstein.w.n@gmail.com/
>
>  sysdeps/x86/sysdep.h | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/sysdeps/x86/sysdep.h b/sysdeps/x86/sysdep.h
> index cac1d762fb..937180c1bd 100644
> --- a/sysdeps/x86/sysdep.h
> +++ b/sysdeps/x86/sysdep.h
> @@ -78,15 +78,18 @@ enum cf_protection_level
>  #define ASM_SIZE_DIRECTIVE(name) .size name,.-name;
>
>  /* Define an entry point visible from C.  */
> -#define        ENTRY(name)
>            \
> +#define        ENTRY_P2ALIGN(name, alignment)
>             \
>    .globl C_SYMBOL_NAME(name);
>     \
>    .type C_SYMBOL_NAME(name),@function;
>    \
> -  .align ALIGNARG(4);
>     \
> +  .align ALIGNARG(alignment);
>     \
>    C_LABEL(name)
>             \
>    cfi_startproc;
>    \
>    _CET_ENDBR;
>     \
>    CALL_MCOUNT
>
> +/* Common entry 16 byte aligns.  */
> +#define ENTRY(name) ENTRY_P2ALIGN (name, 4)
> +
>  #undef END
>  #define END(name)
>     \
>    cfi_endproc;
>    \
> --
> 2.25.1
>
> ping