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Tom Rini1064d982012-02-02 14:07:05 +00001#!/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
Kim Phillipsa32ab4d2015-01-28 13:15:01 -060015# AArch64, PARISC ports by Kyle McMartin
Tom Rini1064d982012-02-02 14:07:05 +000016# sparc port by Martin Habets <errandir_news@mph.eclipse.co.uk>
17#
18# Usage:
19# objdump -d vmlinux | scripts/checkstack.pl [arch]
20#
21# TODO : Port to all architectures (one regex per arch)
22
23use strict;
24
25# check for arch
26#
27# $re is used for two matches:
28# $& (whole re) matches the complete objdump line with the stack growth
29# $1 (first bracket) matches the size of the stack growth
30#
31# $dre is similar, but for dynamic stack redutions:
32# $& (whole re) matches the complete objdump line with the stack growth
33# $1 (first bracket) matches the dynamic amount of the stack growth
34#
35# use anything else and feel the pain ;)
Kim Phillipsa32ab4d2015-01-28 13:15:01 -060036my (@stack, $re, $dre, $x, $xs, $funcre);
Tom Rini1064d982012-02-02 14:07:05 +000037{
38 my $arch = shift;
39 if ($arch eq "") {
40 $arch = `uname -m`;
41 chomp($arch);
42 }
43
44 $x = "[0-9a-f]"; # hex character
45 $xs = "[0-9a-f ]"; # hex character or space
Kim Phillipsa32ab4d2015-01-28 13:15:01 -060046 $funcre = qr/^$x* <(.*)>:$/;
47 if ($arch eq 'aarch64') {
48 #ffffffc0006325cc: a9bb7bfd stp x29, x30, [sp,#-80]!
49 $re = qr/^.*stp.*sp,\#-([0-9]{1,8})\]\!/o;
50 } elsif ($arch eq 'arm') {
Tom Rini1064d982012-02-02 14:07:05 +000051 #c0008ffc: e24dd064 sub sp, sp, #100 ; 0x64
52 $re = qr/.*sub.*sp, sp, #(([0-9]{2}|[3-9])[0-9]{2})/o;
Kim Phillipsa32ab4d2015-01-28 13:15:01 -060053 } elsif ($arch =~ /^x86(_64)?$/ || $arch =~ /^i[3456]86$/) {
Tom Rini1064d982012-02-02 14:07:05 +000054 #c0105234: 81 ec ac 05 00 00 sub $0x5ac,%esp
Kim Phillipsa32ab4d2015-01-28 13:15:01 -060055 # or
56 # 2f60: 48 81 ec e8 05 00 00 sub $0x5e8,%rsp
57 $re = qr/^.*[as][du][db] \$(0x$x{1,8}),\%(e|r)sp$/o;
58 $dre = qr/^.*[as][du][db] (%.*),\%(e|r)sp$/o;
Tom Rini1064d982012-02-02 14:07:05 +000059 } elsif ($arch eq 'ia64') {
60 #e0000000044011fc: 01 0f fc 8c adds r12=-384,r12
61 $re = qr/.*adds.*r12=-(([0-9]{2}|[3-9])[0-9]{2}),r12/o;
62 } elsif ($arch eq 'm68k') {
63 # 2b6c: 4e56 fb70 linkw %fp,#-1168
64 # 1df770: defc ffe4 addaw #-28,%sp
65 $re = qr/.*(?:linkw %fp,|addaw )#-([0-9]{1,4})(?:,%sp)?$/o;
Kim Phillipsa32ab4d2015-01-28 13:15:01 -060066 } elsif ($arch eq 'metag') {
67 #400026fc: 40 00 00 82 ADD A0StP,A0StP,#0x8
68 $re = qr/.*ADD.*A0StP,A0StP,\#(0x$x{1,8})/o;
69 $funcre = qr/^$x* <[^\$](.*)>:$/;
Tom Rini1064d982012-02-02 14:07:05 +000070 } elsif ($arch eq 'mips64') {
71 #8800402c: 67bdfff0 daddiu sp,sp,-16
72 $re = qr/.*daddiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
73 } elsif ($arch eq 'mips') {
74 #88003254: 27bdffe0 addiu sp,sp,-32
75 $re = qr/.*addiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
76 } elsif ($arch eq 'parisc' || $arch eq 'parisc64') {
77 $re = qr/.*ldo ($x{1,8})\(sp\),sp/o;
78 } elsif ($arch eq 'ppc') {
79 #c00029f4: 94 21 ff 30 stwu r1,-208(r1)
80 $re = qr/.*stwu.*r1,-($x{1,8})\(r1\)/o;
81 } elsif ($arch eq 'ppc64') {
82 #XXX
83 $re = qr/.*stdu.*r1,-($x{1,8})\(r1\)/o;
84 } elsif ($arch eq 'powerpc') {
85 $re = qr/.*st[dw]u.*r1,-($x{1,8})\(r1\)/o;
86 } elsif ($arch =~ /^s390x?$/) {
87 # 11160: a7 fb ff 60 aghi %r15,-160
88 # or
89 # 100092: e3 f0 ff c8 ff 71 lay %r15,-56(%r15)
90 $re = qr/.*(?:lay|ag?hi).*\%r15,-(([0-9]{2}|[3-9])[0-9]{2})
91 (?:\(\%r15\))?$/ox;
92 } elsif ($arch =~ /^sh64$/) {
93 #XXX: we only check for the immediate case presently,
94 # though we will want to check for the movi/sub
95 # pair for larger users. -- PFM.
96 #a00048e0: d4fc40f0 addi.l r15,-240,r15
97 $re = qr/.*addi\.l.*r15,-(([0-9]{2}|[3-9])[0-9]{2}),r15/o;
98 } elsif ($arch =~ /^blackfin$/) {
99 # 0: 00 e8 38 01 LINK 0x4e0;
100 $re = qr/.*[[:space:]]LINK[[:space:]]*(0x$x{1,8})/o;
101 } elsif ($arch eq 'sparc' || $arch eq 'sparc64') {
102 # f0019d10: 9d e3 bf 90 save %sp, -112, %sp
103 $re = qr/.*save.*%sp, -(([0-9]{2}|[3-9])[0-9]{2}), %sp/o;
104 } else {
105 print("wrong or unknown architecture \"$arch\"\n");
106 exit
107 }
108}
109
110#
111# main()
112#
Tom Rini1064d982012-02-02 14:07:05 +0000113my ($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;