Root/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# 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# check for arch
25#
26# $re is used for two matches:
27# $& (whole re) matches the complete objdump line with the stack growth
28# $1 (first bracket) matches the size of the stack growth
29#
30# $dre is similar, but for dynamic stack redutions:
31# $& (whole re) matches the complete objdump line with the stack growth
32# $1 (first bracket) matches the dynamic amount of the stack growth
33#
34# use anything else and feel the pain ;)
35my (@stack, $re, $dre, $x, $xs);
36{
37    my $arch = shift;
38    if ($arch eq "") {
39        $arch = `uname -m`;
40        chomp($arch);
41    }
42
43    $x = "[0-9a-f]"; # hex character
44    $xs = "[0-9a-f ]"; # hex character or space
45    if ($arch eq 'arm') {
46        #c0008ffc: e24dd064 sub sp, sp, #100 ; 0x64
47        $re = qr/.*sub.*sp, sp, #(([0-9]{2}|[3-9])[0-9]{2})/o;
48    } elsif ($arch eq 'avr32') {
49        #8000008a: 20 1d sub sp,4
50        #80000ca8: fa cd 05 b0 sub sp,sp,1456
51        $re = qr/^.*sub.*sp.*,([0-9]{1,8})/o;
52    } elsif ($arch =~ /^i[3456]86$/) {
53        #c0105234: 81 ec ac 05 00 00 sub $0x5ac,%esp
54        $re = qr/^.*[as][du][db] \$(0x$x{1,8}),\%esp$/o;
55        $dre = qr/^.*[as][du][db] (%.*),\%esp$/o;
56    } elsif ($arch eq 'x86_64') {
57        # 2f60: 48 81 ec e8 05 00 00 sub $0x5e8,%rsp
58        $re = qr/^.*[as][du][db] \$(0x$x{1,8}),\%rsp$/o;
59        $dre = qr/^.*[as][du][db] (\%.*),\%rsp$/o;
60    } elsif ($arch eq 'ia64') {
61        #e0000000044011fc: 01 0f fc 8c adds r12=-384,r12
62        $re = qr/.*adds.*r12=-(([0-9]{2}|[3-9])[0-9]{2}),r12/o;
63    } elsif ($arch eq 'm68k') {
64        # 2b6c: 4e56 fb70 linkw %fp,#-1168
65        # 1df770: defc ffe4 addaw #-28,%sp
66        $re = qr/.*(?:linkw %fp,|addaw )#-([0-9]{1,4})(?:,%sp)?$/o;
67    } elsif ($arch eq 'mips64') {
68        #8800402c: 67bdfff0 daddiu sp,sp,-16
69        $re = qr/.*daddiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
70    } elsif ($arch eq 'mips') {
71        #88003254: 27bdffe0 addiu sp,sp,-32
72        $re = qr/.*addiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
73    } elsif ($arch eq 'parisc' || $arch eq 'parisc64') {
74        $re = qr/.*ldo ($x{1,8})\(sp\),sp/o;
75    } elsif ($arch eq 'ppc') {
76        #c00029f4: 94 21 ff 30 stwu r1,-208(r1)
77        $re = qr/.*stwu.*r1,-($x{1,8})\(r1\)/o;
78    } elsif ($arch eq 'ppc64') {
79        #XXX
80        $re = qr/.*stdu.*r1,-($x{1,8})\(r1\)/o;
81    } elsif ($arch eq 'powerpc') {
82        $re = qr/.*st[dw]u.*r1,-($x{1,8})\(r1\)/o;
83    } elsif ($arch =~ /^s390x?$/) {
84        # 11160: a7 fb ff 60 aghi %r15,-160
85        # or
86        # 100092: e3 f0 ff c8 ff 71 lay %r15,-56(%r15)
87        $re = qr/.*(?:lay|ag?hi).*\%r15,-(([0-9]{2}|[3-9])[0-9]{2})
88              (?:\(\%r15\))?$/ox;
89    } elsif ($arch =~ /^sh64$/) {
90        #XXX: we only check for the immediate case presently,
91        # though we will want to check for the movi/sub
92        # pair for larger users. -- PFM.
93        #a00048e0: d4fc40f0 addi.l r15,-240,r15
94        $re = qr/.*addi\.l.*r15,-(([0-9]{2}|[3-9])[0-9]{2}),r15/o;
95    } elsif ($arch =~ /^blackfin$/) {
96        # 0: 00 e8 38 01 LINK 0x4e0;
97        $re = qr/.*[[:space:]]LINK[[:space:]]*(0x$x{1,8})/o;
98    } elsif ($arch eq 'sparc' || $arch eq 'sparc64') {
99        # f0019d10: 9d e3 bf 90 save %sp, -112, %sp
100        $re = qr/.*save.*%sp, -(([0-9]{2}|[3-9])[0-9]{2}), %sp/o;
101    } else {
102        print("wrong or unknown architecture \"$arch\"\n");
103        exit
104    }
105}
106
107sub bysize($) {
108    my ($asize, $bsize);
109    ($asize = $a) =~ s/.*: *(.*)$/$1/;
110    ($bsize = $b) =~ s/.*: *(.*)$/$1/;
111    $bsize <=> $asize
112}
113
114#
115# main()
116#
117my $funcre = qr/^$x* <(.*)>:$/;
118my $func;
119my $file, $lastslash;
120
121while (my $line = <STDIN>) {
122    if ($line =~ m/$funcre/) {
123        $func = $1;
124    }
125    elsif ($line =~ m/(.*):\s*file format/) {
126        $file = $1;
127        $file =~ s/\.ko//;
128        $lastslash = rindex($file, "/");
129        if ($lastslash != -1) {
130            $file = substr($file, $lastslash + 1);
131        }
132    }
133    elsif ($line =~ m/$re/) {
134        my $size = $1;
135        $size = hex($size) if ($size =~ /^0x/);
136
137        if ($size > 0xf0000000) {
138            $size = - $size;
139            $size += 0x80000000;
140            $size += 0x80000000;
141        }
142        next if ($size > 0x10000000);
143
144        next if $line !~ m/^($xs*)/;
145        my $addr = $1;
146        $addr =~ s/ /0/g;
147        $addr = "0x$addr";
148
149        my $intro = "$addr $func [$file]:";
150        my $padlen = 56 - length($intro);
151        while ($padlen > 0) {
152            $intro .= ' ';
153            $padlen -= 8;
154        }
155        next if ($size < 100);
156        push @stack, "$intro$size\n";
157    }
158    elsif (defined $dre && $line =~ m/$dre/) {
159        my $size = "Dynamic ($1)";
160
161        next if $line !~ m/^($xs*)/;
162        my $addr = $1;
163        $addr =~ s/ /0/g;
164        $addr = "0x$addr";
165
166        my $intro = "$addr $func [$file]:";
167        my $padlen = 56 - length($intro);
168        while ($padlen > 0) {
169            $intro .= ' ';
170            $padlen -= 8;
171        }
172        push @stack, "$intro$size\n";
173    }
174}
175
176print sort bysize @stack;
177

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