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 #
  14 #       Usage:
  15 #       objdump -d vmlinux | stackcheck_ppc.pl [arch]
  16 #
  17 #       TODO :  Port to all architectures (one regex per arch)
  18
  19 # check for arch
  20 #
  21 # $re is used for two matches:
  22 # $& (whole re) matches the complete objdump line with the stack growth
  23 # $1 (first bracket) matches the size of the stack growth
  24 #
  25 # use anything else and feel the pain ;)
  26 {
  27         my $arch = shift;
  28         if ($arch eq "") {
  29                 $arch = `uname -m`;
  30         }
  31
  32         $x      = "[0-9a-f]";   # hex character
  33         $xs     = "[0-9a-f ]";  # hex character or space
  34         if ($arch =~ /^arm$/) {
  35                 #c0008ffc:      e24dd064        sub     sp, sp, #100    ; 0x64
  36                 $re = qr/.*sub.*sp, sp, #(([0-9]{2}|[3-9])[0-9]{2})/o;
  37         } elsif ($arch =~ /^i[3456]86$/) {
  38                 #c0105234:       81 ec ac 05 00 00       sub    $0x5ac,%esp
  39                 $re = qr/^.*[as][du][db]    \$(0x$x{1,8}),\%esp$/o;
  40         } elsif ($arch =~ /^ia64$/) {
  41                 #e0000000044011fc:       01 0f fc 8c     adds r12=-384,r12
  42                 $re = qr/.*adds.*r12=-(([0-9]{2}|[3-9])[0-9]{2}),r12/o;
  43         } elsif ($arch =~ /^mips64$/) {
  44                 #8800402c:       67bdfff0        daddiu  sp,sp,-16
  45                 $re = qr/.*daddiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
  46         } elsif ($arch =~ /^mips$/) {
  47                 #88003254:       27bdffe0        addiu   sp,sp,-32
  48                 $re = qr/.*addiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
  49         } elsif ($arch =~ /^ppc$/) {
  50                 #c00029f4:       94 21 ff 30     stwu    r1,-208(r1)
  51                 $re = qr/.*stwu.*r1,-($x{1,8})\(r1\)/o;
  52         } elsif ($arch =~ /^ppc64$/) {
  53                 #XXX
  54                 $re = qr/.*stdu.*r1,-($x{1,8})\(r1\)/o;
  55         } elsif ($arch =~ /^s390x?$/) {
  56                 #   11160:       a7 fb ff 60             aghi   %r15,-160
  57                 $re = qr/.*ag?hi.*\%r15,-(([0-9]{2}|[3-9])[0-9]{2})/o;
  58         } else {
  59                 print("wrong or unknown architecture\n");
  60                 exit
  61         }
  62 }
  63
  64 sub bysize($) {
  65         ($asize = $a) =~ s/.*   +(.*)$/$1/;
  66         ($bsize = $b) =~ s/.*   +(.*)$/$1/;
  67         $bsize <=> $asize
  68 }
  69
  70 #
  71 # main()
  72 #
  73 $funcre = qr/^$x* \<(.*)\>:$/;
  74 while ($line = <STDIN>) {
  75         if ($line =~ m/$funcre/) {
  76                 $func = $1;
  77         }
  78         if ($line =~ m/$re/) {
  79                 my $size = $1;
  80                 $size = hex($size) if ($size =~ /^0x/);
  81
  82                 if ($size > 0x80000000) {
  83                         $size = - $size;
  84                         $size += 0x80000000;
  85                         $size += 0x80000000;
  86                 }
  87
  88                 $line =~ m/^($xs*).*/;
  89                 my $addr = $1;
  90                 $addr =~ s/ /0/g;
  91                 $addr = "0x$addr";
  92
  93                 my $intro = "$addr $func:";
  94                 my $padlen = 56 - length($intro);
  95                 while ($padlen > 0) {
  96                         $intro .= '     ';
  97                         $padlen -= 8;
  98                 }
  99                 next if ($size < 100);
 100                 $stack[@stack] = "$intro$size\n";
 101         }
 102 }
 103
 104 @sortedstack = sort bysize @stack;
 105
 106 foreach $i (@sortedstack) {
 107         print("$i");
 108 }