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 (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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