linux-bk/scripts/checkstack.pl
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   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 ;)
  27my (@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 'x86_64') {
  43                #    2f60:      48 81 ec e8 05 00 00    sub    $0x5e8,%rsp
  44                $re = qr/^.*[as][du][db]    \$(0x$x{1,8}),\%rsp$/o;
  45        } elsif ($arch eq 'ia64') {
  46                #e0000000044011fc:       01 0f fc 8c     adds r12=-384,r12
  47                $re = qr/.*adds.*r12=-(([0-9]{2}|[3-9])[0-9]{2}),r12/o;
  48        } elsif ($arch eq 'm68k') {
  49                #    2b6c:       4e56 fb70       linkw %fp,#-1168
  50                #  1df770:       defc ffe4       addaw #-28,%sp
  51                $re = qr/.*(?:linkw %fp,|addaw )#-([0-9]{1,4})(?:,%sp)?$/o;
  52        } elsif ($arch eq 'mips64') {
  53                #8800402c:       67bdfff0        daddiu  sp,sp,-16
  54                $re = qr/.*daddiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
  55        } elsif ($arch eq 'mips') {
  56                #88003254:       27bdffe0        addiu   sp,sp,-32
  57                $re = qr/.*addiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
  58        } elsif ($arch eq 'ppc') {
  59                #c00029f4:       94 21 ff 30     stwu    r1,-208(r1)
  60                $re = qr/.*stwu.*r1,-($x{1,8})\(r1\)/o;
  61        } elsif ($arch eq 'ppc64') {
  62                #XXX
  63                $re = qr/.*stdu.*r1,-($x{1,8})\(r1\)/o;
  64        } elsif ($arch =~ /^s390x?$/) {
  65                #   11160:       a7 fb ff 60             aghi   %r15,-160
  66                $re = qr/.*ag?hi.*\%r15,-(([0-9]{2}|[3-9])[0-9]{2})/o;
  67        } else {
  68                print("wrong or unknown architecture\n");
  69                exit
  70        }
  71}
  72
  73sub bysize($) {
  74        my ($asize, $bsize);
  75        ($asize = $a) =~ s/.*   +(.*)$/$1/;
  76        ($bsize = $b) =~ s/.*   +(.*)$/$1/;
  77        $bsize <=> $asize
  78}
  79
  80#
  81# main()
  82#
  83my $funcre = qr/^$x* <(.*)>:$/;
  84my $func;
  85while (my $line = <STDIN>) {
  86        if ($line =~ m/$funcre/) {
  87                $func = $1;
  88        }
  89        if ($line =~ m/$re/) {
  90                my $size = $1;
  91                $size = hex($size) if ($size =~ /^0x/);
  92
  93                if ($size > 0x80000000) {
  94                        $size = - $size;
  95                        $size += 0x80000000;
  96                        $size += 0x80000000;
  97                }
  98
  99                next if $line !~ m/^($xs*)/;
 100                my $addr = $1;
 101                $addr =~ s/ /0/g;
 102                $addr = "0x$addr";
 103
 104                my $intro = "$addr $func:";
 105                my $padlen = 56 - length($intro);
 106                while ($padlen > 0) {
 107                        $intro .= '     ';
 108                        $padlen -= 8;
 109                }
 110                next if ($size < 100);
 111                push @stack, "$intro$size\n";
 112        }
 113}
 114
 115print sort bysize @stack;
 116
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