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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 McMartin562d1392007-10-20 13:18:56 -070016# PARISC port by Kyle McMartin <kyle@parisc-linux.org>
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* <(.*)>:$/;
Linus Torvalds1da177e2005-04-16 15:20:36 -070048 if ($arch eq 'arm') {
49 #c0008ffc: e24dd064 sub sp, sp, #100 ; 0x64
50 $re = qr/.*sub.*sp, sp, #(([0-9]{2}|[3-9])[0-9]{2})/o;
Haavard Skinnemoen0367d892006-01-04 16:58:49 +010051 } elsif ($arch eq 'avr32') {
52 #8000008a: 20 1d sub sp,4
53 #80000ca8: fa cd 05 b0 sub sp,sp,1456
54 $re = qr/^.*sub.*sp.*,([0-9]{1,8})/o;
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 } elsif ($arch =~ /^i[3456]86$/) {
56 #c0105234: 81 ec ac 05 00 00 sub $0x5ac,%esp
57 $re = qr/^.*[as][du][db] \$(0x$x{1,8}),\%esp$/o;
Eric Sandeen585e93a2008-07-25 01:45:27 -070058 $dre = qr/^.*[as][du][db] (%.*),\%esp$/o;
Linus Torvalds1da177e2005-04-16 15:20:36 -070059 } elsif ($arch eq 'x86_64') {
60 # 2f60: 48 81 ec e8 05 00 00 sub $0x5e8,%rsp
61 $re = qr/^.*[as][du][db] \$(0x$x{1,8}),\%rsp$/o;
Eric Sandeen585e93a2008-07-25 01:45:27 -070062 $dre = qr/^.*[as][du][db] (\%.*),\%rsp$/o;
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 } elsif ($arch eq 'ia64') {
64 #e0000000044011fc: 01 0f fc 8c adds r12=-384,r12
65 $re = qr/.*adds.*r12=-(([0-9]{2}|[3-9])[0-9]{2}),r12/o;
66 } elsif ($arch eq 'm68k') {
67 # 2b6c: 4e56 fb70 linkw %fp,#-1168
68 # 1df770: defc ffe4 addaw #-28,%sp
69 $re = qr/.*(?:linkw %fp,|addaw )#-([0-9]{1,4})(?:,%sp)?$/o;
James Hogan690998b2012-10-17 15:21:13 +010070 } elsif ($arch eq 'metag') {
71 #400026fc: 40 00 00 82 ADD A0StP,A0StP,#0x8
72 $re = qr/.*ADD.*A0StP,A0StP,\#(0x$x{1,8})/o;
73 $funcre = qr/^$x* <[^\$](.*)>:$/;
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 } elsif ($arch eq 'mips64') {
75 #8800402c: 67bdfff0 daddiu sp,sp,-16
76 $re = qr/.*daddiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
77 } elsif ($arch eq 'mips') {
78 #88003254: 27bdffe0 addiu sp,sp,-32
79 $re = qr/.*addiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
Kyle McMartin562d1392007-10-20 13:18:56 -070080 } elsif ($arch eq 'parisc' || $arch eq 'parisc64') {
81 $re = qr/.*ldo ($x{1,8})\(sp\),sp/o;
Linus Torvalds1da177e2005-04-16 15:20:36 -070082 } elsif ($arch eq 'ppc') {
83 #c00029f4: 94 21 ff 30 stwu r1,-208(r1)
84 $re = qr/.*stwu.*r1,-($x{1,8})\(r1\)/o;
85 } elsif ($arch eq 'ppc64') {
86 #XXX
87 $re = qr/.*stdu.*r1,-($x{1,8})\(r1\)/o;
Johannes Berg271c5112006-08-22 16:57:05 +020088 } elsif ($arch eq 'powerpc') {
89 $re = qr/.*st[dw]u.*r1,-($x{1,8})\(r1\)/o;
Linus Torvalds1da177e2005-04-16 15:20:36 -070090 } elsif ($arch =~ /^s390x?$/) {
91 # 11160: a7 fb ff 60 aghi %r15,-160
Christian Borntraeger89d49842008-10-10 21:33:30 +020092 # or
93 # 100092: e3 f0 ff c8 ff 71 lay %r15,-56(%r15)
94 $re = qr/.*(?:lay|ag?hi).*\%r15,-(([0-9]{2}|[3-9])[0-9]{2})
95 (?:\(\%r15\))?$/ox;
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 } elsif ($arch =~ /^sh64$/) {
97 #XXX: we only check for the immediate case presently,
98 # though we will want to check for the movi/sub
99 # pair for larger users. -- PFM.
100 #a00048e0: d4fc40f0 addi.l r15,-240,r15
101 $re = qr/.*addi\.l.*r15,-(([0-9]{2}|[3-9])[0-9]{2}),r15/o;
Mike Frysinger1e9535a2007-10-16 23:27:25 -0700102 } elsif ($arch =~ /^blackfin$/) {
103 # 0: 00 e8 38 01 LINK 0x4e0;
104 $re = qr/.*[[:space:]]LINK[[:space:]]*(0x$x{1,8})/o;
Martin Habetsd41e2d72008-10-21 21:58:29 -0700105 } elsif ($arch eq 'sparc' || $arch eq 'sparc64') {
106 # f0019d10: 9d e3 bf 90 save %sp, -112, %sp
107 $re = qr/.*save.*%sp, -(([0-9]{2}|[3-9])[0-9]{2}), %sp/o;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 } else {
Eric Sandeenabddaec2008-07-25 01:45:28 -0700109 print("wrong or unknown architecture \"$arch\"\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 exit
111 }
112}
113
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114#
115# main()
116#
Stephen Hemminger1f2a1442010-02-22 15:17:09 -0800117my ($func, $file, $lastslash);
Randy Dunlap8ad29142006-06-25 05:48:29 -0700118
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119while (my $line = <STDIN>) {
120 if ($line =~ m/$funcre/) {
121 $func = $1;
122 }
Randy Dunlap8ad29142006-06-25 05:48:29 -0700123 elsif ($line =~ m/(.*):\s*file format/) {
124 $file = $1;
125 $file =~ s/\.ko//;
126 $lastslash = rindex($file, "/");
127 if ($lastslash != -1) {
128 $file = substr($file, $lastslash + 1);
129 }
130 }
131 elsif ($line =~ m/$re/) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 my $size = $1;
133 $size = hex($size) if ($size =~ /^0x/);
134
135 if ($size > 0xf0000000) {
136 $size = - $size;
137 $size += 0x80000000;
138 $size += 0x80000000;
139 }
140 next if ($size > 0x10000000);
141
142 next if $line !~ m/^($xs*)/;
143 my $addr = $1;
144 $addr =~ s/ /0/g;
145 $addr = "0x$addr";
146
Randy Dunlap8ad29142006-06-25 05:48:29 -0700147 my $intro = "$addr $func [$file]:";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 my $padlen = 56 - length($intro);
149 while ($padlen > 0) {
150 $intro .= ' ';
151 $padlen -= 8;
152 }
153 next if ($size < 100);
154 push @stack, "$intro$size\n";
155 }
Eric Sandeen585e93a2008-07-25 01:45:27 -0700156 elsif (defined $dre && $line =~ m/$dre/) {
157 my $size = "Dynamic ($1)";
158
159 next if $line !~ m/^($xs*)/;
160 my $addr = $1;
161 $addr =~ s/ /0/g;
162 $addr = "0x$addr";
163
164 my $intro = "$addr $func [$file]:";
165 my $padlen = 56 - length($intro);
166 while ($padlen > 0) {
167 $intro .= ' ';
168 $padlen -= 8;
169 }
170 push @stack, "$intro$size\n";
171 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172}
173
Stephen Hemminger1f2a1442010-02-22 15:17:09 -0800174# Sort output by size (last field)
175print sort { ($b =~ /:\t*(\d+)$/)[0] <=> ($a =~ /:\t*(\d+)$/)[0] } @stack;
176