projects/linux·blob v2.6.27-rc3 · refs

169 lines · 4.9 KiB

1#!/usr/bin/perl
2
3# Check the stack usage of functions
4#
5# Copyright Joern Engel <[email protected]>
6# Inspired by Linus Torvalds
7# Original idea maybe from Keith Owens
8# s390 port and big speedup by Arnd Bergmann <[email protected]>
9# Mips port by Juan Quintela <[email protected]>
10# IA64 port via Andreas Dilger
11# Arm port by Holger Schurig
12# sh64 port by Paul Mundt
13# Random bits by Matt Mackall <[email protected]>
14# M68k port by Geert Uytterhoeven and Andreas Schwab
15# AVR32 port by Haavard Skinnemoen <[email protected]>
16# PARISC port by Kyle McMartin <[email protected]>
17#
18# Usage:
19# objdump -d vmlinux | scripts/checkstack.pl [arch]
20#
21# TODO : Port to all architectures (one regex per arch)
22
23# check for arch
24#
25# $re is used for two matches:
26# $& (whole re) matches the complete objdump line with the stack growth
27# $1 (first bracket) matches the size of the stack growth
28#
29# $dre is similar, but for dynamic stack redutions:
30# $& (whole re) matches the complete objdump line with the stack growth
31# $1 (first bracket) matches the dynamic amount of the stack growth
32#
33# use anything else and feel the pain ;)
34my (@stack, $re, $dre, $x, $xs);
35{
36 my $arch = shift;
37 if ($arch eq "") {
38 $arch = `uname -m`;
39 chomp($arch);
40 }
41
42 $x = "[0-9a-f]"; # hex character
43 $xs = "[0-9a-f ]"; # hex character or space
44 if ($arch eq 'arm') {
45 #c0008ffc: e24dd064 sub sp, sp, #100 ; 0x64
46 $re = qr/.*sub.*sp, sp, #(([0-9]{2}|[3-9])[0-9]{2})/o;
47 } elsif ($arch eq 'avr32') {
48 #8000008a: 20 1d sub sp,4
49 #80000ca8: fa cd 05 b0 sub sp,sp,1456
50 $re = qr/^.*sub.*sp.*,([0-9]{1,8})/o;
51 } elsif ($arch =~ /^i[3456]86$/) {
52 #c0105234: 81 ec ac 05 00 00 sub $0x5ac,%esp
53 $re = qr/^.*[as][du][db] \$(0x$x{1,8}),\%esp$/o;
54 $dre = qr/^.*[as][du][db] (%.*),\%esp$/o;
55 } elsif ($arch eq 'x86_64') {
56 # 2f60: 48 81 ec e8 05 00 00 sub $0x5e8,%rsp
57 $re = qr/^.*[as][du][db] \$(0x$x{1,8}),\%rsp$/o;
58 $dre = qr/^.*[as][du][db] (\%.*),\%rsp$/o;
59 } 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;
66 } elsif ($arch eq 'mips64') {
67 #8800402c: 67bdfff0 daddiu sp,sp,-16
68 $re = qr/.*daddiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
69 } elsif ($arch eq 'mips') {
70 #88003254: 27bdffe0 addiu sp,sp,-32
71 $re = qr/.*addiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
72 } elsif ($arch eq 'parisc' || $arch eq 'parisc64') {
73 $re = qr/.*ldo ($x{1,8})\(sp\),sp/o;
74 } elsif ($arch eq 'ppc') {
75 #c00029f4: 94 21 ff 30 stwu r1,-208(r1)
76 $re = qr/.*stwu.*r1,-($x{1,8})\(r1\)/o;
77 } elsif ($arch eq 'ppc64') {
78 #XXX
79 $re = qr/.*stdu.*r1,-($x{1,8})\(r1\)/o;
80 } elsif ($arch eq 'powerpc') {
81 $re = qr/.*st[dw]u.*r1,-($x{1,8})\(r1\)/o;
82 } elsif ($arch =~ /^s390x?$/) {
83 # 11160: a7 fb ff 60 aghi %r15,-160
84 $re = qr/.*ag?hi.*\%r15,-(([0-9]{2}|[3-9])[0-9]{2})/o;
85 } elsif ($arch =~ /^sh64$/) {
86 #XXX: we only check for the immediate case presently,
87 # though we will want to check for the movi/sub
88 # pair for larger users. -- PFM.
89 #a00048e0: d4fc40f0 addi.l r15,-240,r15
90 $re = qr/.*addi\.l.*r15,-(([0-9]{2}|[3-9])[0-9]{2}),r15/o;
91 } elsif ($arch =~ /^blackfin$/) {
92 # 0: 00 e8 38 01 LINK 0x4e0;
93 $re = qr/.*[[:space:]]LINK[[:space:]]*(0x$x{1,8})/o;
94 } else {
95 print("wrong or unknown architecture \"$arch\"\n");
96 exit
97 }
98}
99
100sub bysize($) {
101 my ($asize, $bsize);
102 ($asize = $a) =~ s/.*: *(.*)$/$1/;
103 ($bsize = $b) =~ s/.*: *(.*)$/$1/;
104 $bsize <=> $asize
105}
106
107#
108# main()
109#
110my $funcre = qr/^$x* <(.*)>:$/;
111my $func;
112my $file, $lastslash;
113
114while (my $line = <STDIN>) {
115 if ($line =~ m/$funcre/) {
116 $func = $1;
117 }
118 elsif ($line =~ m/(.*):\s*file format/) {
119 $file = $1;
120 $file =~ s/\.ko//;
121 $lastslash = rindex($file, "/");
122 if ($lastslash != -1) {
123 $file = substr($file, $lastslash + 1);
124 }
125 }
126 elsif ($line =~ m/$re/) {
127 my $size = $1;
128 $size = hex($size) if ($size =~ /^0x/);
129
130 if ($size > 0xf0000000) {
131 $size = - $size;
132 $size += 0x80000000;
133 $size += 0x80000000;
134 }
135 next if ($size > 0x10000000);
136
137 next if $line !~ m/^($xs*)/;
138 my $addr = $1;
139 $addr =~ s/ /0/g;
140 $addr = "0x$addr";
141
142 my $intro = "$addr $func [$file]:";
143 my $padlen = 56 - length($intro);
144 while ($padlen > 0) {
145 $intro .= ' ';
146 $padlen -= 8;
147 }
148 next if ($size < 100);
149 push @stack, "$intro$size\n";
150 }
151 elsif (defined $dre && $line =~ m/$dre/) {
152 my $size = "Dynamic ($1)";
153
154 next if $line !~ m/^($xs*)/;
155 my $addr = $1;
156 $addr =~ s/ /0/g;
157 $addr = "0x$addr";
158
159 my $intro = "$addr $func [$file]:";
160 my $padlen = 56 - length($intro);
161 while ($padlen > 0) {
162 $intro .= ' ';
163 $padlen -= 8;
164 }
165 push @stack, "$intro$size\n";
166 }
167}
168
169print sort bysize @stack;