ftrace: scripts/recordmcount.pl support for ARM

Impact: extend scripts/recordmcount.pl to ARM

Arm uses %progbits instead of @progbits and requires only 4 byte alignment.

[ Thanks to Sam Ravnborg for mentioning that ARM uses %progbits ]

Signed-off-by: Jim Radford <radford@galvanix.com>
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/scripts/recordmcount.pl b/scripts/recordmcount.pl
index 03b6af1388eac2efee1fa41731b053182fd887f1..0197e2f6b54440d564b59d15738722ab1c014ef7 100755 (executable)
--- a/scripts/recordmcount.pl
+++ b/scripts/recordmcount.pl
@@ -136,6 +136,7 @@ my $function_regex; # Find the name of a function
                        #    (return offset and func name)
 my $mcount_regex;      # Find the call site to mcount (return offset)
 my $alignment;         # The .align value to use for $mcount_section
+my $section_type;      # Section header plus possible alignment command
 
 if ($arch eq "x86") {
     if ($bits == 64) {
@@ -153,6 +154,7 @@ $nm_regex = "^[0-9a-fA-F]+\\s+t\\s+(\\S+)";
 $section_regex = "Disassembly of section\\s+(\\S+):";
 $function_regex = "^([0-9a-fA-F]+)\\s+<(.*?)>:";
 $mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\smcount\$";
+$section_type = '@progbits';
 $type = ".long";
 
 if ($arch eq "x86_64") {
@@ -192,6 +194,10 @@ if ($arch eq "x86_64") {
        $type = ".quad";
     }
 
+} elsif ($arch eq "arm") {
+    $alignment = 2;
+    $section_type = '%progbits';
+
 } else {
     die "Arch $arch is not supported with CONFIG_FTRACE_MCOUNT_RECORD";
 }
@@ -312,7 +318,7 @@ sub update_funcs
        if (!$opened) {
            open(FILE, ">$mcount_s") || die "can't create $mcount_s\n";
            $opened = 1;
-           print FILE "\t.section $mcount_section,\"a\",\@progbits\n";
+           print FILE "\t.section $mcount_section,\"a\",$section_type\n";
            print FILE "\t.align $alignment\n" if (defined($alignment));
        }
        printf FILE "\t%s %s + %d\n", $type, $ref_func, $offsets[$i] - $offset;