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Subject[PATCH 3/7] ftrace: powerpc mcount record port
Impact: enable PowerPC for dynamic ftrace

This patch converts PowerPC to use the mcount location section.

Currently, modules will be ignored by the converter.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
---
arch/powerpc/Kconfig | 2 ++
scripts/recordmcount.pl | 13 +++++++++++--
2 files changed, 13 insertions(+), 2 deletions(-)
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index adb23ea..99d9500 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -108,6 +108,8 @@ config ARCH_NO_VIRT_TO_BUS
config PPC
bool
default y
+ select HAVE_FTRACE_MCOUNT_RECORD if PPC64
+ select HAVE_DYNAMIC_FTRACE
select HAVE_FUNCTION_TRACER
select ARCH_WANT_OPTIONAL_GPIOLIB
select HAVE_IDE
diff --git a/scripts/recordmcount.pl b/scripts/recordmcount.pl
index eeac71c..7acbe17 100755
--- a/scripts/recordmcount.pl
+++ b/scripts/recordmcount.pl
@@ -130,6 +130,7 @@ my %weak; # List of weak functions
my %convert; # List of local functions used that needs conversion

my $type;
+my $nm_regex; # Find the local functions (return function)
my $section_regex; # Find the start of a section
my $function_regex; # Find the name of a function
# (return offset and func name)
@@ -145,6 +146,7 @@ if ($arch eq "x86") {
}

if ($arch eq "x86_64") {
+ $nm_regex = "^[0-9a-fA-F]+\\s+t\\s+(\\S+)";
$section_regex = "Disassembly of section\\s+(\\S+):";
$function_regex = "^([0-9a-fA-F]+)\\s+<(.*?)>:";
$mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\smcount([+-]0x[0-9a-zA-Z]+)?\$";
@@ -158,6 +160,7 @@ if ($arch eq "x86_64") {
$cc .= " -m64";

} elsif ($arch eq "i386") {
+ $nm_regex = "^[0-9a-fA-F]+\\s+t\\s+(\\S+)";
$section_regex = "Disassembly of section\\s+(\\S+):";
$function_regex = "^([0-9a-fA-F]+)\\s+<(.*?)>:";
$mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\smcount\$";
@@ -170,6 +173,12 @@ if ($arch eq "x86_64") {
$objcopy .= " -O elf32-i386";
$cc .= " -m32";

+} elsif ($arch eq "powerpc") {
+ $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]+):.*\\s\\.?_mcount\$";
+ $type = ".quad";
} else {
die "Arch $arch is not supported with CONFIG_FTRACE_MCOUNT_RECORD";
}
@@ -239,7 +248,7 @@ if (!$found_version) {
#
open (IN, "$nm $inputfile|") || die "error running $nm";
while (<IN>) {
- if (/^[0-9a-fA-F]+\s+t\s+(\S+)/) {
+ if (/$nm_regex/) {
$locals{$1} = 1;
} elsif (/^[0-9a-fA-F]+\s+([wW])\s+(\S+)/) {
$weak{$2} = $1;
@@ -291,7 +300,7 @@ sub update_funcs
open(FILE, ">$mcount_s") || die "can't create $mcount_s\n";
$opened = 1;
print FILE "\t.section $mcount_section,\"a\",\@progbits\n";
- print FILE "\t.align $alignment\n";
+ print FILE "\t.align $alignment\n" if (defined($alignment));
}
printf FILE "\t%s %s + %d\n", $type, $ref_func, $offsets[$i] - $offset;
}
--
1.5.6.5
--


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