scripts/checkstack.pl

   1 #!/usr/bin/perl
   2
   3 #       Check the stack usage of functions
   4 #
   5 #       Copyright Joern Engel <joern@wh.fh-wedel.de>
   6 #       Inspired by Linus Torvalds
   7 #       Original idea maybe from Keith Owens
   8 #       s390 port and big speedup by Arnd Bergmann <arnd@bergmann-dalldorf.de>
   9 #       Mips port by Juan Quintela <quintela@mandrakesoft.com>
  10 #       IA64 port via Andreas Dilger
  11 #       Arm port by Holger Schurig
  12 #       Random bits by Matt Mackall <mpm@selenic.com>
  13 #       M68k port by Geert Uytterhoeven and Andreas Schwab
  14 #
  15 #       Usage:
  16 #       objdump -d vmlinux | stackcheck.pl [arch]
  17 #
  18 #       TODO :  Port to all architectures (one regex per arch)
  19
  20 # check for arch
  21 #
  22 # $re is used for two matches:
  23 # $& (whole re) matches the complete objdump line with the stack growth
  24 # $1 (first bracket) matches the size of the stack growth
  25 #
  26 # use anything else and feel the pain ;)
  27 my (@stack, $re, $x, $xs);
  28 {
  29         my $arch = shift;
  30         if ($arch eq "") {
  31                 $arch = `uname -m`;
  32         }
  33
  34         $x      = "[0-9a-f]";   # hex character
  35         $xs     = "[0-9a-f ]";  # hex character or space
  36         if ($arch eq 'arm') {
  37                 #c0008ffc:      e24dd064        sub     sp, sp, #100    ; 0x64
  38                 $re = qr/.*sub.*sp, sp, #(([0-9]{2}|[3-9])[0-9]{2})/o;
  39         } elsif ($arch =~ /^i[3456]86$/) {
  40                 #c0105234:       81 ec ac 05 00 00       sub    $0x5ac,%esp
  41                 $re = qr/^.*[as][du][db]    \$(0x$x{1,8}),\%esp$/o;
  42         } elsif ($arch eq 'ia64') {
  43                 #e0000000044011fc:       01 0f fc 8c     adds r12=-384,r12
  44                 $re = qr/.*adds.*r12=-(([0-9]{2}|[3-9])[0-9]{2}),r12/o;
  45         } elsif ($arch eq 'm68k') {
  46                 #    2b6c:       4e56 fb70       linkw %fp,#-1168
  47                 #  1df770:       defc ffe4       addaw #-28,%sp
  48                 $re = qr/.*(?:linkw %fp,|addaw )#-([0-9]{1,4})(?:,%sp)?$/o;
  49         } elsif ($arch eq 'mips64') {
  50                 #8800402c:       67bdfff0        daddiu  sp,sp,-16
  51                 $re = qr/.*daddiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
  52         } elsif ($arch eq 'mips') {
  53                 #88003254:       27bdffe0        addiu   sp,sp,-32
  54                 $re = qr/.*addiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
  55         } elsif ($arch eq 'ppc') {
  56                 #c00029f4:       94 21 ff 30     stwu    r1,-208(r1)
  57                 $re = qr/.*stwu.*r1,-($x{1,8})\(r1\)/o;
  58         } elsif ($arch eq 'ppc64') {
  59                 #XXX
  60                 $re = qr/.*stdu.*r1,-($x{1,8})\(r1\)/o;
  61         } elsif ($arch =~ /^s390x?$/) {
  62                 #   11160:       a7 fb ff 60             aghi   %r15,-160
  63                 $re = qr/.*ag?hi.*\%r15,-(([0-9]{2}|[3-9])[0-9]{2})/o;
  64         } else {
  65                 print("wrong or unknown architecture\n");
  66                 exit
  67         }
  68 }
  69
  70 sub bysize($) {
  71         my ($asize, $bsize);
  72         ($asize = $a) =~ s/.*   +(.*)$/$1/;
  73         ($bsize = $b) =~ s/.*   +(.*)$/$1/;
  74         $bsize <=> $asize
  75 }
  76
  77 #
  78 # main()
  79 #
  80 my $funcre = qr/^$x* <(.*)>:$/;
  81 my $func;
  82 while (my $line = <STDIN>) {
  83         if ($line =~ m/$funcre/) {
  84                 $func = $1;
  85         }
  86         if ($line =~ m/$re/) {
  87                 my $size = $1;
  88                 $size = hex($size) if ($size =~ /^0x/);
  89
  90                 if ($size > 0x80000000) {
  91                         $size = - $size;
  92                         $size += 0x80000000;
  93                         $size += 0x80000000;
  94                 }
  95
  96                 next if $line !~ m/^($xs*)/;
  97                 my $addr = $1;
  98                 $addr =~ s/ /0/g;
  99                 $addr = "0x$addr";
 100
 101                 my $intro = "$addr $func:";
 102                 my $padlen = 56 - length($intro);
 103                 while ($padlen > 0) {
 104                         $intro .= '     ';
 105                         $padlen -= 8;
 106                 }
 107                 next if ($size < 100);
 108                 push @stack, "$intro$size\n";
 109         }
 110 }
 111
 112 print sort bysize @stack;