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SubjectRe: [PATCH] recordmcount.pl: add support for __fentry__
On Thu, 31 Oct 2013 15:59:58 +0000
Jamie Iles <jamie.iles@oracle.com> wrote:

> With gcc 4.6.0 the -mfentry feature places the function profiling call
> at the start of the function. When this is used, the call is to
> __fentry__ and not mcount.
>
> Based on 48bb5dc6cd9d30fe0d594947563da1f8bd9abada (ftrace: Make
> recordmcount.c handle __fentry__).

Why? All current users of __fentry__ use the C version of recordmcount.
This just slows down the few archs that still use recordmcount.pl.

-- Steve

>
> Cc: Steven Rostedt <rostedt@goodmis.org>
> Signed-off-by: Jamie Iles <jamie.iles@oracle.com>
> ---
> scripts/recordmcount.pl | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/scripts/recordmcount.pl b/scripts/recordmcount.pl
> index a674fd5..6460fc68 100755
> --- a/scripts/recordmcount.pl
> +++ b/scripts/recordmcount.pl
> @@ -214,7 +214,7 @@ $local_regex = "^[0-9a-fA-F]+\\s+t\\s+(\\S+)";
> $weak_regex = "^[0-9a-fA-F]+\\s+([wW])\\s+(\\S+)";
> $section_regex = "Disassembly of section\\s+(\\S+):";
> $function_regex = "^([0-9a-fA-F]+)\\s+<(.*?)>:";
> -$mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\smcount\$";
> +$mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\s(mcount|__fentry__)\$";
> $section_type = '@progbits';
> $mcount_adjust = 0;
> $type = ".long";



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