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Commit 465c6cca authored by Mike Frysinger's avatar Mike Frysinger Committed by Steven Rostedt
Browse files

tracing: Extend recordmcount to better support Blackfin mcount 



The mcount call on Blackfin systems includes some stack manipulation
around the actual call site, so extend the build time perl script to
support this.  This way we can avoid doing the calculation at runtime.

Signed-off-by: default avatarMike Frysinger <vapier@gentoo.org>
LKML-Reference: <1281079584-21205-1-git-send-email-vapier@gentoo.org>
Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
parent 18fab912

scripts/recordmcount.pl

+6 −1
Original line number Diff line number Diff line
@@ -159,6 +159,7 @@ my $section_regex; # Find the start of a section 
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 $mcount_adjust;	# Address adjustment to mcount offset

my $alignment;		# The .align value to use for $mcount_section

my $section_type;	# Section header plus possible alignment command

my $can_use_local = 0; 	# If we can use local function references
@@ -213,6 +214,7 @@ $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';

$mcount_adjust = 0;

$type = ".long";



if ($arch eq "x86_64") {
@@ -351,6 +353,9 @@ if ($arch eq "x86_64") { 
} elsif ($arch eq "microblaze") {

    # Microblaze calls '_mcount' instead of plain 'mcount'.

    $mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\s_mcount\$";

} elsif ($arch eq "blackfin") {

    $mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\s__mcount\$";

    $mcount_adjust = -4;

} else {

    die "Arch $arch is not supported with CONFIG_FTRACE_MCOUNT_RECORD";

}
@@ -511,7 +516,7 @@ while (<IN>) { 
    }

    # is this a call site to mcount? If so, record it to print later

    if ($text_found && /$mcount_regex/) {

	push(@offsets, hex $1);

	push(@offsets, (hex $1) + $mcount_adjust);

    }

}