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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: Mike Frysinger <vapier@gentoo.org>
LKML-Reference: <1281079584-21205-1-git-send-email-vapier@gentoo.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Mike Frysinger 2010-08-06 03:26:24 -04:00 committed by Steven Rostedt
parent 18fab912d4
commit 465c6cca26
1 changed files with 6 additions and 1 deletions
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7
scripts/recordmcount.pl
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@ -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);
}
}