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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#!/usr/bin/perl
2
3# Check the stack usage of functions
4#
5# Copyright Joern Engel <joern@wh.fh-wedel.de>
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#
16# Usage:
17# objdump -d vmlinux | stackcheck.pl [arch]
18#
19# TODO : Port to all architectures (one regex per arch)
20
21# check for arch
22#
23# $re is used for two matches:
24# $& (whole re) matches the complete objdump line with the stack growth
25# $1 (first bracket) matches the size of the stack growth
26#
27# use anything else and feel the pain ;)
28my (@stack, $re, $x, $xs);
29{
30 my $arch = shift;
31 if ($arch eq "") {
32 $arch = `uname -m`;
33 }
34
35 $x = "[0-9a-f]"; # hex character
36 $xs = "[0-9a-f ]"; # hex character or space
37 if ($arch eq 'arm') {
38 #c0008ffc: e24dd064 sub sp, sp, #100 ; 0x64
39 $re = qr/.*sub.*sp, sp, #(([0-9]{2}|[3-9])[0-9]{2})/o;
40 } elsif ($arch =~ /^i[3456]86$/) {
41 #c0105234: 81 ec ac 05 00 00 sub $0x5ac,%esp
42 $re = qr/^.*[as][du][db] \$(0x$x{1,8}),\%esp$/o;
43 } elsif ($arch eq 'x86_64') {
44 # 2f60: 48 81 ec e8 05 00 00 sub $0x5e8,%rsp
45 $re = qr/^.*[as][du][db] \$(0x$x{1,8}),\%rsp$/o;
46 } elsif ($arch eq 'ia64') {
47 #e0000000044011fc: 01 0f fc 8c adds r12=-384,r12
48 $re = qr/.*adds.*r12=-(([0-9]{2}|[3-9])[0-9]{2}),r12/o;
49 } elsif ($arch eq 'm68k') {
50 # 2b6c: 4e56 fb70 linkw %fp,#-1168
51 # 1df770: defc ffe4 addaw #-28,%sp
52 $re = qr/.*(?:linkw %fp,|addaw )#-([0-9]{1,4})(?:,%sp)?$/o;
53 } elsif ($arch eq 'mips64') {
54 #8800402c: 67bdfff0 daddiu sp,sp,-16
55 $re = qr/.*daddiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
56 } elsif ($arch eq 'mips') {
57 #88003254: 27bdffe0 addiu sp,sp,-32
58 $re = qr/.*addiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
59 } elsif ($arch eq 'ppc') {
60 #c00029f4: 94 21 ff 30 stwu r1,-208(r1)
61 $re = qr/.*stwu.*r1,-($x{1,8})\(r1\)/o;
62 } elsif ($arch eq 'ppc64') {
63 #XXX
64 $re = qr/.*stdu.*r1,-($x{1,8})\(r1\)/o;
Johannes Berg271c5112006-08-22 16:57:05 +020065 } elsif ($arch eq 'powerpc') {
66 $re = qr/.*st[dw]u.*r1,-($x{1,8})\(r1\)/o;
Linus Torvalds1da177e2005-04-16 15:20:36 -070067 } elsif ($arch =~ /^s390x?$/) {
68 # 11160: a7 fb ff 60 aghi %r15,-160
69 $re = qr/.*ag?hi.*\%r15,-(([0-9]{2}|[3-9])[0-9]{2})/o;
70 } elsif ($arch =~ /^sh64$/) {
71 #XXX: we only check for the immediate case presently,
72 # though we will want to check for the movi/sub
73 # pair for larger users. -- PFM.
74 #a00048e0: d4fc40f0 addi.l r15,-240,r15
75 $re = qr/.*addi\.l.*r15,-(([0-9]{2}|[3-9])[0-9]{2}),r15/o;
76 } else {
77 print("wrong or unknown architecture\n");
78 exit
79 }
80}
81
82sub bysize($) {
83 my ($asize, $bsize);
84 ($asize = $a) =~ s/.*: *(.*)$/$1/;
85 ($bsize = $b) =~ s/.*: *(.*)$/$1/;
86 $bsize <=> $asize
87}
88
89#
90# main()
91#
92my $funcre = qr/^$x* <(.*)>:$/;
93my $func;
Randy Dunlap8ad29142006-06-25 05:48:29 -070094my $file, $lastslash;
95
Linus Torvalds1da177e2005-04-16 15:20:36 -070096while (my $line = <STDIN>) {
97 if ($line =~ m/$funcre/) {
98 $func = $1;
99 }
Randy Dunlap8ad29142006-06-25 05:48:29 -0700100 elsif ($line =~ m/(.*):\s*file format/) {
101 $file = $1;
102 $file =~ s/\.ko//;
103 $lastslash = rindex($file, "/");
104 if ($lastslash != -1) {
105 $file = substr($file, $lastslash + 1);
106 }
107 }
108 elsif ($line =~ m/$re/) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 my $size = $1;
110 $size = hex($size) if ($size =~ /^0x/);
111
112 if ($size > 0xf0000000) {
113 $size = - $size;
114 $size += 0x80000000;
115 $size += 0x80000000;
116 }
117 next if ($size > 0x10000000);
118
119 next if $line !~ m/^($xs*)/;
120 my $addr = $1;
121 $addr =~ s/ /0/g;
122 $addr = "0x$addr";
123
Randy Dunlap8ad29142006-06-25 05:48:29 -0700124 my $intro = "$addr $func [$file]:";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125 my $padlen = 56 - length($intro);
126 while ($padlen > 0) {
127 $intro .= ' ';
128 $padlen -= 8;
129 }
130 next if ($size < 100);
131 push @stack, "$intro$size\n";
132 }
133}
134
135print sort bysize @stack;