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