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 #       sh64 port by Paul Mundt
  13 #       Random bits by Matt Mackall <mpm@selenic.com>
  14 #       M68k port by Geert Uytterhoeven and Andreas Schwab
  15 #
  16 #       Usage:
  17 #       objdump -d vmlinux | stackcheck.pl [arch]
  18 #
  19 #       TODO :  Port to all architectures (one regex per arch)
  20
  21 # check for arch
  22 #
  23 # $re is used for two matches:
  24 # $& (whole re) matches the complete objdump line with the stack growth
  25 # $1 (first bracket) matches the size of the stack growth
  26 #
  27 # use anything else and feel the pain ;)
  28 my (@stack, $re, $x, $xs);
  29 {
  30         my $arch = shift;
  31         if ($arch eq "") {
  32                 $arch = `uname -m`;
  33         }
  34
  35         $x      = "[0-9a-f]";   # hex character
  36         $xs     = "[0-9a-f ]";  # hex character or space
  37         if ($arch eq 'arm') {
  38                 #c0008ffc:      e24dd064        sub     sp, sp, #100    ; 0x64
  39                 $re = qr/.*sub.*sp, sp, #(([0-9]{2}|[3-9])[0-9]{2})/o;
  40         } elsif ($arch =~ /^i[3456]86$/) {
  41                 #c0105234:       81 ec ac 05 00 00       sub    $0x5ac,%esp
  42                 $re = qr/^.*[as][du][db]    \$(0x$x{1,8}),\%esp$/o;
  43         } elsif ($arch eq 'x86_64') {
  44                 #    2f60:      48 81 ec e8 05 00 00    sub    $0x5e8,%rsp
  45                 $re = qr/^.*[as][du][db]    \$(0x$x{1,8}),\%rsp$/o;
  46         } elsif ($arch eq 'ia64') {
  47                 #e0000000044011fc:       01 0f fc 8c     adds r12=-384,r12
  48                 $re = qr/.*adds.*r12=-(([0-9]{2}|[3-9])[0-9]{2}),r12/o;
  49         } elsif ($arch eq 'm68k') {
  50                 #    2b6c:       4e56 fb70       linkw %fp,#-1168
  51                 #  1df770:       defc ffe4       addaw #-28,%sp
  52                 $re = qr/.*(?:linkw %fp,|addaw )#-([0-9]{1,4})(?:,%sp)?$/o;
  53         } elsif ($arch eq 'mips64') {
  54                 #8800402c:       67bdfff0        daddiu  sp,sp,-16
  55                 $re = qr/.*daddiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
  56         } elsif ($arch eq 'mips') {
  57                 #88003254:       27bdffe0        addiu   sp,sp,-32
  58                 $re = qr/.*addiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
  59         } elsif ($arch eq 'ppc') {
  60                 #c00029f4:       94 21 ff 30     stwu    r1,-208(r1)
  61                 $re = qr/.*stwu.*r1,-($x{1,8})\(r1\)/o;
  62         } elsif ($arch eq 'ppc64') {
  63                 #XXX
  64                 $re = qr/.*stdu.*r1,-($x{1,8})\(r1\)/o;
  65         } elsif ($arch =~ /^s390x?$/) {
  66                 #   11160:       a7 fb ff 60             aghi   %r15,-160
  67                 $re = qr/.*ag?hi.*\%r15,-(([0-9]{2}|[3-9])[0-9]{2})/o;
  68         } elsif ($arch =~ /^sh64$/) {
  69                 #XXX: we only check for the immediate case presently,
  70                 #     though we will want to check for the movi/sub
  71                 #     pair for larger users. -- PFM.
  72                 #a00048e0:       d4fc40f0        addi.l  r15,-240,r15
  73                 $re = qr/.*addi\.l.*r15,-(([0-9]{2}|[3-9])[0-9]{2}),r15/o;
  74         } else {
  75                 print("wrong or unknown architecture\n");
  76                 exit
  77         }
  78 }
  79
  80 sub bysize($) {
  81         my ($asize, $bsize);
  82         ($asize = $a) =~ s/.*:  *(.*)$/$1/;
  83         ($bsize = $b) =~ s/.*:  *(.*)$/$1/;
  84         $bsize <=> $asize
  85 }
  86
  87 #
  88 # main()
  89 #
  90 my $funcre = qr/^$x* <(.*)>:$/;
  91 my $func;
  92 while (my $line = <STDIN>) {
  93         if ($line =~ m/$funcre/) {
  94                 $func = $1;
  95         }
  96         if ($line =~ m/$re/) {
  97                 my $size = $1;
  98                 $size = hex($size) if ($size =~ /^0x/);
  99
 100                 if ($size > 0xf0000000) {
 101                         $size = - $size;
 102                         $size += 0x80000000;
 103                         $size += 0x80000000;
 104                 }
 105                 next if ($size > 0x10000000);
 106
 107                 next if $line !~ m/^($xs*)/;
 108                 my $addr = $1;
 109                 $addr =~ s/ /0/g;
 110                 $addr = "0x$addr";
 111
 112                 my $intro = "$addr $func:";
 113                 my $padlen = 56 - length($intro);
 114                 while ($padlen > 0) {
 115                         $intro .= '     ';
 116                         $padlen -= 8;
 117                 }
 118                 next if ($size < 100);
 119                 push @stack, "$intro$size\n";
 120         }
 121 }
 122
 123 print sort bysize @stack;