scripts/checkstack.pl

   1 #!/usr/bin/perl
   2
   3 #       Check the stack usage of functions
   4 #
   5 #       Copyright Joern Engel <joern@lazybastard.org>
   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 #       AVR32 port by Haavard Skinnemoen <hskinnemoen@atmel.com>
  16 #       PARISC port by Kyle McMartin <kyle@parisc-linux.org>
  17 #       sparc port by Martin Habets <errandir_news@mph.eclipse.co.uk>
  18 #
  19 #       Usage:
  20 #       objdump -d vmlinux | scripts/checkstack.pl [arch]
  21 #
  22 #       TODO :  Port to all architectures (one regex per arch)
  23
  24 # check for arch
  25 #
  26 # $re is used for two matches:
  27 # $& (whole re) matches the complete objdump line with the stack growth
  28 # $1 (first bracket) matches the size of the stack growth
  29 #
  30 # $dre is similar, but for dynamic stack redutions:
  31 # $& (whole re) matches the complete objdump line with the stack growth
  32 # $1 (first bracket) matches the dynamic amount of the stack growth
  33 #
  34 # use anything else and feel the pain ;)
  35 my (@stack, $re, $dre, $x, $xs);
  36 {
  37         my $arch = shift;
  38         if ($arch eq "") {
  39                 $arch = `uname -m`;
  40                 chomp($arch);
  41         }
  42
  43         $x      = "[0-9a-f]";   # hex character
  44         $xs     = "[0-9a-f ]";  # hex character or space
  45         if ($arch eq 'arm') {
  46                 #c0008ffc:      e24dd064        sub     sp, sp, #100    ; 0x64
  47                 $re = qr/.*sub.*sp, sp, #(([0-9]{2}|[3-9])[0-9]{2})/o;
  48         } elsif ($arch eq 'avr32') {
  49                 #8000008a:       20 1d           sub sp,4
  50                 #80000ca8:       fa cd 05 b0     sub sp,sp,1456
  51                 $re = qr/^.*sub.*sp.*,([0-9]{1,8})/o;
  52         } elsif ($arch =~ /^i[3456]86$/) {
  53                 #c0105234:       81 ec ac 05 00 00       sub    $0x5ac,%esp
  54                 $re = qr/^.*[as][du][db]    \$(0x$x{1,8}),\%esp$/o;
  55                 $dre = qr/^.*[as][du][db]    (%.*),\%esp$/o;
  56         } elsif ($arch eq 'x86_64') {
  57                 #    2f60:      48 81 ec e8 05 00 00    sub    $0x5e8,%rsp
  58                 $re = qr/^.*[as][du][db]    \$(0x$x{1,8}),\%rsp$/o;
  59                 $dre = qr/^.*[as][du][db]    (\%.*),\%rsp$/o;
  60         } elsif ($arch eq 'ia64') {
  61                 #e0000000044011fc:       01 0f fc 8c     adds r12=-384,r12
  62                 $re = qr/.*adds.*r12=-(([0-9]{2}|[3-9])[0-9]{2}),r12/o;
  63         } elsif ($arch eq 'm68k') {
  64                 #    2b6c:       4e56 fb70       linkw %fp,#-1168
  65                 #  1df770:       defc ffe4       addaw #-28,%sp
  66                 $re = qr/.*(?:linkw %fp,|addaw )#-([0-9]{1,4})(?:,%sp)?$/o;
  67         } elsif ($arch eq 'mips64') {
  68                 #8800402c:       67bdfff0        daddiu  sp,sp,-16
  69                 $re = qr/.*daddiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
  70         } elsif ($arch eq 'mips') {
  71                 #88003254:       27bdffe0        addiu   sp,sp,-32
  72                 $re = qr/.*addiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
  73         } elsif ($arch eq 'parisc' || $arch eq 'parisc64') {
  74                 $re = qr/.*ldo ($x{1,8})\(sp\),sp/o;
  75         } elsif ($arch eq 'ppc') {
  76                 #c00029f4:       94 21 ff 30     stwu    r1,-208(r1)
  77                 $re = qr/.*stwu.*r1,-($x{1,8})\(r1\)/o;
  78         } elsif ($arch eq 'ppc64') {
  79                 #XXX
  80                 $re = qr/.*stdu.*r1,-($x{1,8})\(r1\)/o;
  81         } elsif ($arch eq 'powerpc') {
  82                 $re = qr/.*st[dw]u.*r1,-($x{1,8})\(r1\)/o;
  83         } elsif ($arch =~ /^s390x?$/) {
  84                 #   11160:       a7 fb ff 60             aghi   %r15,-160
  85                 # or
  86                 #  100092:       e3 f0 ff c8 ff 71       lay     %r15,-56(%r15)
  87                 $re = qr/.*(?:lay|ag?hi).*\%r15,-(([0-9]{2}|[3-9])[0-9]{2})
  88                       (?:\(\%r15\))?$/ox;
  89         } elsif ($arch =~ /^sh64$/) {
  90                 #XXX: we only check for the immediate case presently,
  91                 #     though we will want to check for the movi/sub
  92                 #     pair for larger users. -- PFM.
  93                 #a00048e0:       d4fc40f0        addi.l  r15,-240,r15
  94                 $re = qr/.*addi\.l.*r15,-(([0-9]{2}|[3-9])[0-9]{2}),r15/o;
  95         } elsif ($arch =~ /^blackfin$/) {
  96                 #   0:   00 e8 38 01     LINK 0x4e0;
  97                 $re = qr/.*[[:space:]]LINK[[:space:]]*(0x$x{1,8})/o;
  98         } elsif ($arch eq 'sparc' || $arch eq 'sparc64') {
  99                 # f0019d10:       9d e3 bf 90     save  %sp, -112, %sp
 100                 $re = qr/.*save.*%sp, -(([0-9]{2}|[3-9])[0-9]{2}), %sp/o;
 101         } else {
 102                 print("wrong or unknown architecture \"$arch\"\n");
 103                 exit
 104         }
 105 }
 106
 107 sub bysize($) {
 108         my ($asize, $bsize);
 109         ($asize = $a) =~ s/.*:  *(.*)$/$1/;
 110         ($bsize = $b) =~ s/.*:  *(.*)$/$1/;
 111         $bsize <=> $asize
 112 }
 113
 114 #
 115 # main()
 116 #
 117 my $funcre = qr/^$x* <(.*)>:$/;
 118 my $func;
 119 my $file, $lastslash;
 120
 121 while (my $line = <STDIN>) {
 122         if ($line =~ m/$funcre/) {
 123                 $func = $1;
 124         }
 125         elsif ($line =~ m/(.*):\s*file format/) {
 126                 $file = $1;
 127                 $file =~ s/\.ko//;
 128                 $lastslash = rindex($file, "/");
 129                 if ($lastslash != -1) {
 130                         $file = substr($file, $lastslash + 1);
 131                 }
 132         }
 133         elsif ($line =~ m/$re/) {
 134                 my $size = $1;
 135                 $size = hex($size) if ($size =~ /^0x/);
 136
 137                 if ($size > 0xf0000000) {
 138                         $size = - $size;
 139                         $size += 0x80000000;
 140                         $size += 0x80000000;
 141                 }
 142                 next if ($size > 0x10000000);
 143
 144                 next if $line !~ m/^($xs*)/;
 145                 my $addr = $1;
 146                 $addr =~ s/ /0/g;
 147                 $addr = "0x$addr";
 148
 149                 my $intro = "$addr $func [$file]:";
 150                 my $padlen = 56 - length($intro);
 151                 while ($padlen > 0) {
 152                         $intro .= '     ';
 153                         $padlen -= 8;
 154                 }
 155                 next if ($size < 100);
 156                 push @stack, "$intro$size\n";
 157         }
 158         elsif (defined $dre && $line =~ m/$dre/) {
 159                 my $size = "Dynamic ($1)";
 160
 161                 next if $line !~ m/^($xs*)/;
 162                 my $addr = $1;
 163                 $addr =~ s/ /0/g;
 164                 $addr = "0x$addr";
 165
 166                 my $intro = "$addr $func [$file]:";
 167                 my $padlen = 56 - length($intro);
 168                 while ($padlen > 0) {
 169                         $intro .= '     ';
 170                         $padlen -= 8;
 171                 }
 172                 push @stack, "$intro$size\n";
 173         }
 174 }
 175
 176 print sort bysize @stack;