Re: [PATCH 08/10] ARM: ftrace: fix and update dynamic ftrace
From: Steven Rostedt
Date: Sat Mar 13 2010 - 12:43:09 EST
On Sat, 2010-03-13 at 12:19 +0530, Rabin Vincent wrote:
> This adds mcount recording and updates dynamic ftrace for ARM to work
> with the new ftrace dyamic tracing implementation. It also adds support
> for the mcount format used by newer ARM compilers.
>
> With dynamic tracing, mcount() is implemented as a nop. Callsites are
> patched on startup with nops, and dynamically patched to call to the
> ftrace_caller() routine as needed.
>
> Signed-off-by: Rabin Vincent <rabin@xxxxx
> diff --git a/scripts/recordmcount.pl b/scripts/recordmcount.pl
> index f3c9c0a..319af1e 100755
> --- a/scripts/recordmcount.pl
> +++ b/scripts/recordmcount.pl
> @@ -268,6 +268,8 @@ if ($arch eq "x86_64") {
> } elsif ($arch eq "arm") {
> $alignment = 2;
> $section_type = '%progbits';
> + $mcount_regex = "^\\s*([0-9a-fA-F]+):\\s*R_ARM_(CALL|PC24)" .
> + "\\s+(__gnu_mcount_nc|mcount)\$";
>
> } elsif ($arch eq "ia64") {
> $mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\s_mcount\$";
Acked-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
-- Steve
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