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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#!/usr/bin/perl
2
3# Check the stack usage of functions
4#
Joern Engel2b54aae2008-02-06 01:38:02 -08005# Copyright Joern Engel <joern@lazybastard.org>
Linus Torvalds1da177e2005-04-16 15:20:36 -07006# 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
Jean Delvaree05503e2011-05-18 16:49:24 +020015# AVR32 port by Haavard Skinnemoen (Atmel)
Kyle McMartin208ad002014-06-20 11:41:37 -040016# AArch64, PARISC ports by Kyle McMartin
Martin Habetsd41e2d72008-10-21 21:58:29 -070017# sparc port by Martin Habets <errandir_news@mph.eclipse.co.uk>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#
19# Usage:
Joern Engel477116e2007-10-18 23:39:18 -070020# objdump -d vmlinux | scripts/checkstack.pl [arch]
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#
22# TODO : Port to all architectures (one regex per arch)
23
Stephen Hemminger1f2a1442010-02-22 15:17:09 -080024use strict;
25
Linus Torvalds1da177e2005-04-16 15:20:36 -070026# 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#
Eric Sandeen585e93a2008-07-25 01:45:27 -070032# $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#
Linus Torvalds1da177e2005-04-16 15:20:36 -070036# use anything else and feel the pain ;)
James Hogan690998b2012-10-17 15:21:13 +010037my (@stack, $re, $dre, $x, $xs, $funcre);
Linus Torvalds1da177e2005-04-16 15:20:36 -070038{
39 my $arch = shift;
40 if ($arch eq "") {
41 $arch = `uname -m`;
Eric Sandeenabddaec2008-07-25 01:45:28 -070042 chomp($arch);
Linus Torvalds1da177e2005-04-16 15:20:36 -070043 }
44
45 $x = "[0-9a-f]"; # hex character
46 $xs = "[0-9a-f ]"; # hex character or space
James Hogan690998b2012-10-17 15:21:13 +010047 $funcre = qr/^$x* <(.*)>:$/;
Kyle McMartin208ad002014-06-20 11:41:37 -040048 if ($arch eq 'aarch64') {
Qian Cai38886b12018-12-14 14:17:20 -080049 #ffffffc0006325cc: a9bb7bfd stp x29, x30, [sp, #-80]!
50 $re = qr/^.*stp.*sp, \#-([0-9]{1,8})\]\!/o;
Kyle McMartin208ad002014-06-20 11:41:37 -040051 } elsif ($arch eq 'arm') {
Linus Torvalds1da177e2005-04-16 15:20:36 -070052 #c0008ffc: e24dd064 sub sp, sp, #100 ; 0x64
53 $re = qr/.*sub.*sp, sp, #(([0-9]{2}|[3-9])[0-9]{2})/o;
Haavard Skinnemoen0367d892006-01-04 16:58:49 +010054 } elsif ($arch eq 'avr32') {
55 #8000008a: 20 1d sub sp,4
56 #80000ca8: fa cd 05 b0 sub sp,sp,1456
57 $re = qr/^.*sub.*sp.*,([0-9]{1,8})/o;
Konstantin Khlebnikovfda9f992014-08-08 14:23:35 -070058 } elsif ($arch =~ /^x86(_64)?$/ || $arch =~ /^i[3456]86$/) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070059 #c0105234: 81 ec ac 05 00 00 sub $0x5ac,%esp
Konstantin Khlebnikovfda9f992014-08-08 14:23:35 -070060 # 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 } 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;
James Hogan690998b2012-10-17 15:21:13 +010071 } 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* <[^\$](.*)>:$/;
Linus Torvalds1da177e2005-04-16 15:20:36 -070075 } elsif ($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 $re = qr/.*addiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
Kyle McMartin562d1392007-10-20 13:18:56 -070081 } elsif ($arch eq 'parisc' || $arch eq 'parisc64') {
82 $re = qr/.*ldo ($x{1,8})\(sp\),sp/o;
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 } 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;
Johannes Berg271c5112006-08-22 16:57:05 +020089 } elsif ($arch eq 'powerpc') {
90 $re = qr/.*st[dw]u.*r1,-($x{1,8})\(r1\)/o;
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 } elsif ($arch =~ /^s390x?$/) {
92 # 11160: a7 fb ff 60 aghi %r15,-160
Christian Borntraeger89d49842008-10-10 21:33:30 +020093 # 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 (?:\(\%r15\))?$/ox;
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 } elsif ($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 $re = qr/.*addi\.l.*r15,-(([0-9]{2}|[3-9])[0-9]{2}),r15/o;
Mike Frysinger1e9535a2007-10-16 23:27:25 -0700103 } elsif ($arch =~ /^blackfin$/) {
104 # 0: 00 e8 38 01 LINK 0x4e0;
105 $re = qr/.*[[:space:]]LINK[[:space:]]*(0x$x{1,8})/o;
Martin Habetsd41e2d72008-10-21 21:58:29 -0700106 } elsif ($arch eq 'sparc' || $arch eq 'sparc64') {
107 # f0019d10: 9d e3 bf 90 save %sp, -112, %sp
108 $re = qr/.*save.*%sp, -(([0-9]{2}|[3-9])[0-9]{2}), %sp/o;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 } else {
Eric Sandeenabddaec2008-07-25 01:45:28 -0700110 print("wrong or unknown architecture \"$arch\"\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 exit
112 }
113}
114
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115#
116# main()
117#
Stephen Hemminger1f2a1442010-02-22 15:17:09 -0800118my ($func, $file, $lastslash);
Randy Dunlap8ad29142006-06-25 05:48:29 -0700119
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120while (my $line = <STDIN>) {
121 if ($line =~ m/$funcre/) {
122 $func = $1;
123 }
Randy Dunlap8ad29142006-06-25 05:48:29 -0700124 elsif ($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/) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 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
Randy Dunlap8ad29142006-06-25 05:48:29 -0700148 my $intro = "$addr $func [$file]:";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 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 }
Eric Sandeen585e93a2008-07-25 01:45:27 -0700157 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$size\n";
172 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173}
174
Stephen Hemminger1f2a1442010-02-22 15:17:09 -0800175# Sort output by size (last field)
176print sort { ($b =~ /:\t*(\d+)$/)[0] <=> ($a =~ /:\t*(\d+)$/)[0] } @stack;