scripts/kernel-doc: fix empty function description section

[safe/jmp/linux-2.6] / scripts / recordmcount.pl

diff --git a/scripts/recordmcount.pl b/scripts/recordmcount.pl
index f0d1445..f3c9c0a 100755 (executable)
--- 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";
@@ -194,7 +195,7 @@ sub check_objcopy
     }
 }
 
-if ($arch eq "x86") {
+if ($arch =~ /(x86(_64)?)|(i386)/) {
     if ($bits == 64) {
        $arch = "x86_64";
     } else {
@@ -295,6 +296,61 @@ if ($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";
 }
@@ -377,14 +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;
     }
 }
 
@@ -421,11 +477,7 @@ 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();
 
@@ -459,7 +511,7 @@ 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);
     }
 }