linux/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@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 (Atmel)
  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
  24use strict;
  25
  26# check for arch
  27#
  28# $re is used for two matches:
  29# $& (whole re) matches the complete objdump line with the stack growth
  30# $1 (first bracket) matches the size of the stack growth
  31#
  32# $dre is similar, but for dynamic stack redutions:
  33# $& (whole re) matches the complete objdump line with the stack growth
  34# $1 (first bracket) matches the dynamic amount of the stack growth
  35#
  36# use anything else and feel the pain ;)
  37my (@stack, $re, $dre, $x, $xs);
  38{
  39        my $arch = shift;
  40        if ($arch eq "") {
  41                $arch = `uname -m`;
  42                chomp($arch);
  43        }
  44
  45        $x      = "[0-9a-f]";   # hex character
  46        $xs     = "[0-9a-f ]";  # hex character or space
  47        if ($arch eq 'arm') {
  48                #c0008ffc:      e24dd064        sub     sp, sp, #100    ; 0x64
  49                $re = qr/.*sub.*sp, sp, #(([0-9]{2}|[3-9])[0-9]{2})/o;
  50        } elsif ($arch eq 'avr32') {
  51                #8000008a:       20 1d           sub sp,4
  52                #80000ca8:       fa cd 05 b0     sub sp,sp,1456
  53                $re = qr/^.*sub.*sp.*,([0-9]{1,8})/o;
  54        } elsif ($arch =~ /^i[3456]86$/) {
  55                #c0105234:       81 ec ac 05 00 00       sub    $0x5ac,%esp
  56                $re = qr/^.*[as][du][db]    \$(0x$x{1,8}),\%esp$/o;
  57                $dre = qr/^.*[as][du][db]    (%.*),\%esp$/o;
  58        } elsif ($arch eq 'x86_64') {
  59                #    2f60:      48 81 ec e8 05 00 00    sub    $0x5e8,%rsp
  60                $re = qr/^.*[as][du][db]    \$(0x$x{1,8}),\%rsp$/o;
  61                $dre = qr/^.*[as][du][db]    (\%.*),\%rsp$/o;
  62        } elsif ($arch eq 'ia64') {
  63                #e0000000044011fc:       01 0f fc 8c     adds r12=-384,r12
  64                $re = qr/.*adds.*r12=-(([0-9]{2}|[3-9])[0-9]{2}),r12/o;
  65        } elsif ($arch eq 'm68k') {
  66                #    2b6c:       4e56 fb70       linkw %fp,#-1168
  67                #  1df770:       defc ffe4       addaw #-28,%sp
  68                $re = qr/.*(?:linkw %fp,|addaw )#-([0-9]{1,4})(?:,%sp)?$/o;
  69        } elsif ($arch eq 'mips64') {
  70                #8800402c:       67bdfff0        daddiu  sp,sp,-16
  71                $re = qr/.*daddiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
  72        } elsif ($arch eq 'mips') {
  73                #88003254:       27bdffe0        addiu   sp,sp,-32
  74                $re = qr/.*addiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
  75        } elsif ($arch eq 'parisc' || $arch eq 'parisc64') {
  76                $re = qr/.*ldo ($x{1,8})\(sp\),sp/o;
  77        } elsif ($arch eq 'ppc') {
  78                #c00029f4:       94 21 ff 30     stwu    r1,-208(r1)
  79                $re = qr/.*stwu.*r1,-($x{1,8})\(r1\)/o;
  80        } elsif ($arch eq 'ppc64') {
  81                #XXX
  82                $re = qr/.*stdu.*r1,-($x{1,8})\(r1\)/o;
  83        } elsif ($arch eq 'powerpc') {
  84                $re = qr/.*st[dw]u.*r1,-($x{1,8})\(r1\)/o;
  85        } elsif ($arch =~ /^s390x?$/) {
  86                #   11160:       a7 fb ff 60             aghi   %r15,-160
  87                # or
  88                #  100092:       e3 f0 ff c8 ff 71       lay     %r15,-56(%r15)
  89                $re = qr/.*(?:lay|ag?hi).*\%r15,-(([0-9]{2}|[3-9])[0-9]{2})
  90                      (?:\(\%r15\))?$/ox;
  91        } elsif ($arch =~ /^sh64$/) {
  92                #XXX: we only check for the immediate case presently,
  93                #     though we will want to check for the movi/sub
  94                #     pair for larger users. -- PFM.
  95                #a00048e0:       d4fc40f0        addi.l  r15,-240,r15
  96                $re = qr/.*addi\.l.*r15,-(([0-9]{2}|[3-9])[0-9]{2}),r15/o;
  97        } elsif ($arch =~ /^blackfin$/) {
  98                #   0:   00 e8 38 01     LINK 0x4e0;
  99                $re = qr/.*[[:space:]]LINK[[:space:]]*(0x$x{1,8})/o;
 100        } elsif ($arch eq 'sparc' || $arch eq 'sparc64') {
 101                # f0019d10:       9d e3 bf 90     save  %sp, -112, %sp
 102                $re = qr/.*save.*%sp, -(([0-9]{2}|[3-9])[0-9]{2}), %sp/o;
 103        } else {
 104                print("wrong or unknown architecture \"$arch\"\n");
 105                exit
 106        }
 107}
 108
 109#
 110# main()
 111#
 112my $funcre = qr/^$x* <(.*)>:$/;
 113my ($func, $file, $lastslash);
 114
 115while (my $line = <STDIN>) {
 116        if ($line =~ m/$funcre/) {
 117                $func = $1;
 118        }
 119        elsif ($line =~ m/(.*):\s*file format/) {
 120                $file = $1;
 121                $file =~ s/\.ko//;
 122                $lastslash = rindex($file, "/");
 123                if ($lastslash != -1) {
 124                        $file = substr($file, $lastslash + 1);
 125                }
 126        }
 127        elsif ($line =~ m/$re/) {
 128                my $size = $1;
 129                $size = hex($size) if ($size =~ /^0x/);
 130
 131                if ($size > 0xf0000000) {
 132                        $size = - $size;
 133                        $size += 0x80000000;
 134                        $size += 0x80000000;
 135                }
 136                next if ($size > 0x10000000);
 137
 138                next if $line !~ m/^($xs*)/;
 139                my $addr = $1;
 140                $addr =~ s/ /0/g;
 141                $addr = "0x$addr";
 142
 143                my $intro = "$addr $func [$file]:";
 144                my $padlen = 56 - length($intro);
 145                while ($padlen > 0) {
 146                        $intro .= '     ';
 147                        $padlen -= 8;
 148                }
 149                next if ($size < 100);
 150                push @stack, "$intro$size\n";
 151        }
 152        elsif (defined $dre && $line =~ m/$dre/) {
 153                my $size = "Dynamic ($1)";
 154
 155                next if $line !~ m/^($xs*)/;
 156                my $addr = $1;
 157                $addr =~ s/ /0/g;
 158                $addr = "0x$addr";
 159
 160                my $intro = "$addr $func [$file]:";
 161                my $padlen = 56 - length($intro);
 162                while ($padlen > 0) {
 163                        $intro .= '     ';
 164                        $padlen -= 8;
 165                }
 166                push @stack, "$intro$size\n";
 167        }
 168}
 169
 170# Sort output by size (last field)
 171print sort { ($b =~ /:\t*(\d+)$/)[0] <=> ($a =~ /:\t*(\d+)$/)[0] } @stack;
 172
 173
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