X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=scripts%2Frecordmcount.pl;h=f3c9c0a90b98cad68389da5d591a9921e1cb8f39;hb=4434ade8c9334a3ab975d8993de456f06841899e;hp=7265a7dcac4b33d0f92e45aec5fbd3e79be1cbdc;hpb=306dcf47d28aaf9aedfafb17a602768584cfc0f2;p=safe%2Fjmp%2Flinux-2.6

diff --git a/scripts/recordmcount.pl b/scripts/recordmcount.pl
index 7265a7d..f3c9c0a 100755
--- a/scripts/recordmcount.pl
+++ b/scripts/recordmcount.pl
@@ -113,13 +113,13 @@ $P =~ s@.*/@@g;
 
 my $V = '0.1';
 
-if ($#ARGV != 10) {
-	print "usage: $P arch bits objdump objcopy cc ld nm rm mv is_module inputfile\n";
+if ($#ARGV != 11) {
+	print "usage: $P arch endian bits objdump objcopy cc ld nm rm mv is_module inputfile\n";
 	print "version: $V\n";
 	exit(1);
 }
 
-my ($arch, $bits, $objdump, $objcopy, $cc,
+my ($arch, $endian, $bits, $objdump, $objcopy, $cc,
     $ld, $nm, $rm, $mv, $is_module, $inputfile) = @ARGV;
 
 # This file refers to mcount and shouldn't be ftraced, so lets' ignore it
@@ -136,13 +136,14 @@ my %text_sections = (
      ".text.unlikely" => 1,
 );
 
-$objdump = "objdump" if ((length $objdump) == 0);
-$objcopy = "objcopy" if ((length $objcopy) == 0);
-$cc = "gcc" if ((length $cc) == 0);
-$ld = "ld" if ((length $ld) == 0);
-$nm = "nm" if ((length $nm) == 0);
-$rm = "rm" if ((length $rm) == 0);
-$mv = "mv" if ((length $mv) == 0);
+# Note: we are nice to C-programmers here, thus we skip the '||='-idiom.
+$objdump = 'objdump' if (!$objdump);
+$objcopy = 'objcopy' if (!$objcopy);
+$cc = 'gcc' if (!$cc);
+$ld = 'ld' if (!$ld);
+$nm = 'nm' if (!$nm);
+$rm = 'rm' if (!$rm);
+$mv = 'mv' if (!$mv);
 
 #print STDERR "running: $P '$arch' '$objdump' '$objcopy' '$cc' '$ld' " .
 #    "'$nm' '$rm' '$mv' '$inputfile'\n";
@@ -162,6 +163,11 @@ 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
 
+# Shut up recordmcount if user has older objcopy
+my $quiet_recordmcount = ".tmp_quiet_recordmcount";
+my $print_warning = 1;
+$print_warning = 0 if ( -f $quiet_recordmcount);
+
 ##
 # check_objcopy - whether objcopy supports --globalize-symbols
 #
@@ -179,14 +185,17 @@ sub check_objcopy
     }
     close (IN);
 
-    if (!$can_use_local) {
+    if (!$can_use_local && $print_warning) {
 	print STDERR "WARNING: could not find objcopy version or version " .
 	    "is less than 2.17.\n" .
-	    "\tLocal function references is disabled.\n";
+	    "\tLocal function references are disabled.\n";
+	open (QUIET, ">$quiet_recordmcount");
+	printf QUIET "Disables the warning from recordmcount.pl\n";
+	close QUIET;
     }
 }
 
-if ($arch eq "x86") {
+if ($arch =~ /(x86(_64)?)|(i386)/) {
     if ($bits == 64) {
 	$arch = "x86_64";
     } else {
@@ -287,6 +296,61 @@ if ($arch eq "x86_64") {
     $ld .= " -m elf64_sparc";
     $cc .= " -m64";
     $objcopy .= " -O elf64-sparc";
+} elsif ($arch eq "mips") {
+    # To enable module support, we need to enable the -mlong-calls option
+    # of gcc for module, after using this option, we can not get the real
+    # offset of the calling to _mcount, but the offset of the lui
+    # instruction or the addiu one. herein, we record the address of the
+    # first one, and then we can replace this instruction by a branch
+    # instruction to jump over the profiling function to filter the
+    # indicated functions, or swith back to the lui instruction to trace
+    # them, which means dynamic tracing.
+    #
+    #       c:	3c030000 	lui	v1,0x0
+    #			c: R_MIPS_HI16	_mcount
+    #			c: R_MIPS_NONE	*ABS*
+    #			c: R_MIPS_NONE	*ABS*
+    #      10:	64630000 	daddiu	v1,v1,0
+    #			10: R_MIPS_LO16	_mcount
+    #			10: R_MIPS_NONE	*ABS*
+    #			10: R_MIPS_NONE	*ABS*
+    #      14:	03e0082d 	move	at,ra
+    #      18:	0060f809 	jalr	v1
+    #
+    # for the kernel:
+    #
+    #     10:   03e0082d        move    at,ra
+    #	  14:   0c000000        jal     0 <loongson_halt>
+    #                    14: R_MIPS_26   _mcount
+    #                    14: R_MIPS_NONE *ABS*
+    #                    14: R_MIPS_NONE *ABS*
+    #	 18:   00020021        nop
+    if ($is_module eq "0") {
+	    $mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\s_mcount\$";
+    } else {
+	    $mcount_regex = "^\\s*([0-9a-fA-F]+): R_MIPS_HI16\\s+_mcount\$";
+    }
+    $objdump .= " -Melf-trad".$endian."mips ";
+
+    if ($endian eq "big") {
+	    $endian = " -EB ";
+	    $ld .= " -melf".$bits."btsmip";
+    } else {
+	    $endian = " -EL ";
+	    $ld .= " -melf".$bits."ltsmip";
+    }
+
+    $cc .= " -mno-abicalls -fno-pic -mabi=" . $bits . $endian;
+    $ld .= $endian;
+
+    if ($bits == 64) {
+	    $function_regex =
+		"^([0-9a-fA-F]+)\\s+<(.|[^\$]L.*?|\$[^L].*?|[^\$][^L].*?)>:";
+	    $type = ".dword";
+    }
+} elsif ($arch eq "microblaze") {
+    # Microblaze calls '_mcount' instead of plain 'mcount'.
+    $mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\s_mcount\$";
 } else {
     die "Arch $arch is not supported with CONFIG_FTRACE_MCOUNT_RECORD";
 }
@@ -348,19 +412,13 @@ my $offset = 0;		# offset of ref_func to section beginning
 #
 sub update_funcs
 {
-    return if ($#offsets < 0);
-
-    defined($ref_func) || die "No function to reference";
+    return unless ($ref_func and @offsets);
 
-    # A section only had a weak function, to represent it.
-    # Unfortunately, a weak function may be overwritten by another
-    # function of the same name, making all these offsets incorrect.
-    # To be safe, we simply print a warning and bail.
+    # Sanity check on weak function. A weak function may be overwritten by
+    # another function of the same name, making all these offsets incorrect.
     if (defined $weak{$ref_func}) {
-	print STDERR
-	    "$inputfile: WARNING: referencing weak function" .
+	die "$inputfile: ERROR: referencing weak function" .
 	    " $ref_func for mcount\n";
-	return;
     }
 
     # is this function static? If so, note this fact.
@@ -375,14 +433,14 @@ sub update_funcs
 
     # Loop through all the mcount caller offsets and print a reference
     # to the caller based from the ref_func.
-    for (my $i=0; $i <= $#offsets; $i++) {
-	if (!$opened) {
-	    open(FILE, ">$mcount_s") || die "can't create $mcount_s\n";
-	    $opened = 1;
-	    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] - $offset;
+    if (!$opened) {
+	open(FILE, ">$mcount_s") || die "can't create $mcount_s\n";
+	$opened = 1;
+	print FILE "\t.section $mcount_section,\"a\",$section_type\n";
+	print FILE "\t.align $alignment\n" if (defined($alignment));
+    }
+    foreach my $cur_offset (@offsets) {
+	printf FILE "\t%s %s + %d\n", $type, $ref_func, $cur_offset - $offset;
     }
 }
 
@@ -419,13 +477,9 @@ while (<IN>) {
 	$read_headers = 0;
 
 	# Only record text sections that we know are safe
-	if (defined($text_sections{$1})) {
-	    $read_function = 1;
-	} else {
-	    $read_function = 0;
-	}
+	$read_function = defined($text_sections{$1});
 	# print out any recorded offsets
-	update_funcs() if (defined($ref_func));
+	update_funcs();
 
 	# reset all markers and arrays
 	$text_found = 0;
@@ -457,12 +511,12 @@ while (<IN>) {
     }
     # is this a call site to mcount? If so, record it to print later
     if ($text_found && /$mcount_regex/) {
-	$offsets[$#offsets + 1] = hex $1;
+	push(@offsets, hex $1);
     }
 }
 
 # dump out anymore offsets that may have been found
-update_funcs() if (defined($ref_func));
+update_funcs();
 
 # If we did not find any mcount callers, we are done (do nothing).
 if (!$opened) {