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Linux/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 (Atmel)
 16 #       AArch64, PARISC ports by Kyle McMartin
 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 use 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 ;)
 37 my (@stack, $re, $dre, $x, $xs, $funcre);
 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         $funcre = qr/^$x* <(.*)>:$/;
 48         if ($arch eq 'aarch64') {
 49                 #ffffffc0006325cc:       a9bb7bfd        stp     x29, x30, [sp,#-80]!
 50                 $re = qr/^.*stp.*sp,\#-([0-9]{1,8})\]\!/o;
 51         } elsif ($arch eq 'arm') {
 52                 #c0008ffc:      e24dd064        sub     sp, sp, #100    ; 0x64
 53                 $re = qr/.*sub.*sp, sp, #(([0-9]{2}|[3-9])[0-9]{2})/o;
 54         } elsif ($arch eq 'avr32') {
 55                 #8000008a:       20 1d           sub sp,4
 56                 #80000ca8:       fa cd 05 b0     sub sp,sp,1456
 57                 $re = qr/^.*sub.*sp.*,([0-9]{1,8})/o;
 58         } elsif ($arch =~ /^x86(_64)?$/ || $arch =~ /^i[3456]86$/) {
 59                 #c0105234:       81 ec ac 05 00 00       sub    $0x5ac,%esp
 60                 # or
 61                 #    2f60:    48 81 ec e8 05 00 00       sub    $0x5e8,%rsp
 62                 $re = qr/^.*[as][du][db]    \$(0x$x{1,8}),\%(e|r)sp$/o;
 63                 $dre = qr/^.*[as][du][db]    (%.*),\%(e|r)sp$/o;
 64         } elsif ($arch eq 'ia64') {
 65                 #e0000000044011fc:       01 0f fc 8c     adds r12=-384,r12
 66                 $re = qr/.*adds.*r12=-(([0-9]{2}|[3-9])[0-9]{2}),r12/o;
 67         } elsif ($arch eq 'm68k') {
 68                 #    2b6c:       4e56 fb70       linkw %fp,#-1168
 69                 #  1df770:       defc ffe4       addaw #-28,%sp
 70                 $re = qr/.*(?:linkw %fp,|addaw )#-([0-9]{1,4})(?:,%sp)?$/o;
 71         } elsif ($arch eq 'metag') {
 72                 #400026fc:       40 00 00 82     ADD       A0StP,A0StP,#0x8
 73                 $re = qr/.*ADD.*A0StP,A0StP,\#(0x$x{1,8})/o;
 74                 $funcre = qr/^$x* <[^\$](.*)>:$/;
 75         } elsif ($arch eq 'mips64') {
 76                 #8800402c:       67bdfff0        daddiu  sp,sp,-16
 77                 $re = qr/.*daddiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
 78         } elsif ($arch eq 'mips') {
 79                 #88003254:       27bdffe0        addiu   sp,sp,-32
 80                 $re = qr/.*addiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
 81         } elsif ($arch eq 'parisc' || $arch eq 'parisc64') {
 82                 $re = qr/.*ldo ($x{1,8})\(sp\),sp/o;
 83         } elsif ($arch eq 'ppc') {
 84                 #c00029f4:       94 21 ff 30     stwu    r1,-208(r1)
 85                 $re = qr/.*stwu.*r1,-($x{1,8})\(r1\)/o;
 86         } elsif ($arch eq 'ppc64') {
 87                 #XXX
 88                 $re = qr/.*stdu.*r1,-($x{1,8})\(r1\)/o;
 89         } elsif ($arch eq 'powerpc') {
 90                 $re = qr/.*st[dw]u.*r1,-($x{1,8})\(r1\)/o;
 91         } elsif ($arch =~ /^s390x?$/) {
 92                 #   11160:       a7 fb ff 60             aghi   %r15,-160
 93                 # or
 94                 #  100092:       e3 f0 ff c8 ff 71       lay     %r15,-56(%r15)
 95                 $re = qr/.*(?:lay|ag?hi).*\%r15,-(([0-9]{2}|[3-9])[0-9]{2})
 96                       (?:\(\%r15\))?$/ox;
 97         } elsif ($arch =~ /^sh64$/) {
 98                 #XXX: we only check for the immediate case presently,
 99                 #     though we will want to check for the movi/sub
100                 #     pair for larger users. -- PFM.
101                 #a00048e0:       d4fc40f0        addi.l  r15,-240,r15
102                 $re = qr/.*addi\.l.*r15,-(([0-9]{2}|[3-9])[0-9]{2}),r15/o;
103         } elsif ($arch =~ /^blackfin$/) {
104                 #   0:   00 e8 38 01     LINK 0x4e0;
105                 $re = qr/.*[[:space:]]LINK[[:space:]]*(0x$x{1,8})/o;
106         } elsif ($arch eq 'sparc' || $arch eq 'sparc64') {
107                 # f0019d10:       9d e3 bf 90     save  %sp, -112, %sp
108                 $re = qr/.*save.*%sp, -(([0-9]{2}|[3-9])[0-9]{2}), %sp/o;
109         } else {
110                 print("wrong or unknown architecture \"$arch\"\n");
111                 exit
112         }
113 }
114 
115 #
116 # main()
117 #
118 my ($func, $file, $lastslash);
119 
120 while (my $line = <STDIN>) {
121         if ($line =~ m/$funcre/) {
122                 $func = $1;
123         }
124         elsif ($line =~ m/(.*):\s*file format/) {
125                 $file = $1;
126                 $file =~ s/\.ko//;
127                 $lastslash = rindex($file, "/");
128                 if ($lastslash != -1) {
129                         $file = substr($file, $lastslash + 1);
130                 }
131         }
132         elsif ($line =~ m/$re/) {
133                 my $size = $1;
134                 $size = hex($size) if ($size =~ /^0x/);
135 
136                 if ($size > 0xf0000000) {
137                         $size = - $size;
138                         $size += 0x80000000;
139                         $size += 0x80000000;
140                 }
141                 next if ($size > 0x10000000);
142 
143                 next if $line !~ m/^($xs*)/;
144                 my $addr = $1;
145                 $addr =~ s/ /0/g;
146                 $addr = "0x$addr";
147 
148                 my $intro = "$addr $func [$file]:";
149                 my $padlen = 56 - length($intro);
150                 while ($padlen > 0) {
151                         $intro .= '     ';
152                         $padlen -= 8;
153                 }
154                 next if ($size < 100);
155                 push @stack, "$intro$size\n";
156         }
157         elsif (defined $dre && $line =~ m/$dre/) {
158                 my $size = "Dynamic ($1)";
159 
160                 next if $line !~ m/^($xs*)/;
161                 my $addr = $1;
162                 $addr =~ s/ /0/g;
163                 $addr = "0x$addr";
164 
165                 my $intro = "$addr $func [$file]:";
166                 my $padlen = 56 - length($intro);
167                 while ($padlen > 0) {
168                         $intro .= '     ';
169                         $padlen -= 8;
170                 }
171                 push @stack, "$intro$size\n";
172         }
173 }
174 
175 # Sort output by size (last field)
176 print sort { ($b =~ /:\t*(\d+)$/)[0] <=> ($a =~ /:\t*(\d+)$/)[0] } @stack;

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