Commit f02b625d authored Nov 05, 2013 by Jamie Iles Committed by Steven Rostedt Nov 05, 2013

recordmcount.pl: Add support for fentry

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.  This is required for Ksplice as the C
version of recordmcount doesn't insert section symbols for the
__mcount_loc section so we fall back to the perl version.

Based on 48bb5dc6 (ftrace: Make
recordmcount.c handle __fentry__).
Link: http://lkml.kernel.org/r/1383648129-10724-1-git-send-email-jamie.iles@oracle.com



Signed-off-by: Jamie Iles <jamie.iles@oracle.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

parent b5aa3a47

scripts/recordmcount.pl

+2 −2

Original line number	Diff line number	Diff line
		@@ -214,13 +214,13 @@ $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";

		if ($arch eq "x86_64") {
		$mcount_regex = "^\\s([0-9a-fA-F]+):.\\smcount([+-]0x[0-9a-zA-Z]+)?\$";
		$mcount_regex = "^\\s([0-9a-fA-F]+):.\\s(mcount\|__fentry__)([+-]0x[0-9a-zA-Z]+)?\$";
		$type = ".quad";
		$alignment = 8;
		$mcount_adjust = -1;

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