projects/linux·blob v3.17-rc6 · refs

173 lines · 5.3 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 (Atmel)
16# PARISC port by Kyle McMartin <[email protected]>
17# sparc port by Martin Habets <[email protected]>
18#
19# Usage:
20# objdump -d vmlinux | scripts/checkstack.pl [arch]
21#
22# TODO : Port to all architectures (one regex per arch)
23
24use strict;
25
26# 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#
32# $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#
36# use anything else and feel the pain ;)
37my (@stack, $re, $dre, $x, $xs, $funcre);
38{
39 my $arch = shift;
40 if ($arch eq "") {
41 $arch = `uname -m`;
42 chomp($arch);
43 }
44
45 $x = "[0-9a-f]"; # hex character
46 $xs = "[0-9a-f ]"; # hex character or space
47 $funcre = qr/^$x* <(.*)>:$/;
48 if ($arch eq 'arm') {
49 #c0008ffc: e24dd064 sub sp, sp, #100 ; 0x64
50 $re = qr/.*sub.*sp, sp, #(([0-9]{2}|[3-9])[0-9]{2})/o;
51 } elsif ($arch eq 'avr32') {
52 #8000008a: 20 1d sub sp,4
53 #80000ca8: fa cd 05 b0 sub sp,sp,1456
54 $re = qr/^.*sub.*sp.*,([0-9]{1,8})/o;
55 } elsif ($arch =~ /^x86(_64)?$/ || $arch =~ /^i[3456]86$/) {
56 #c0105234: 81 ec ac 05 00 00 sub $0x5ac,%esp
57 # or
58 # 2f60: 48 81 ec e8 05 00 00 sub $0x5e8,%rsp
59 $re = qr/^.*[as][du][db] \$(0x$x{1,8}),\%(e|r)sp$/o;
60 $dre = qr/^.*[as][du][db] (%.*),\%(e|r)sp$/o;
61 } elsif ($arch eq 'ia64') {
62 #e0000000044011fc: 01 0f fc 8c adds r12=-384,r12
63 $re = qr/.*adds.*r12=-(([0-9]{2}|[3-9])[0-9]{2}),r12/o;
64 } elsif ($arch eq 'm68k') {
65 # 2b6c: 4e56 fb70 linkw %fp,#-1168
66 # 1df770: defc ffe4 addaw #-28,%sp
67 $re = qr/.*(?:linkw %fp,|addaw )#-([0-9]{1,4})(?:,%sp)?$/o;
68 } elsif ($arch eq 'metag') {
69 #400026fc: 40 00 00 82 ADD A0StP,A0StP,#0x8
70 $re = qr/.*ADD.*A0StP,A0StP,\#(0x$x{1,8})/o;
71 $funcre = qr/^$x* <[^\$](.*)>:$/;
72 } elsif ($arch eq 'mips64') {
73 #8800402c: 67bdfff0 daddiu sp,sp,-16
74 $re = qr/.*daddiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
75 } elsif ($arch eq 'mips') {
76 #88003254: 27bdffe0 addiu sp,sp,-32
77 $re = qr/.*addiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
78 } elsif ($arch eq 'parisc' || $arch eq 'parisc64') {
79 $re = qr/.*ldo ($x{1,8})\(sp\),sp/o;
80 } elsif ($arch eq 'ppc') {
81 #c00029f4: 94 21 ff 30 stwu r1,-208(r1)
82 $re = qr/.*stwu.*r1,-($x{1,8})\(r1\)/o;
83 } elsif ($arch eq 'ppc64') {
84 #XXX
85 $re = qr/.*stdu.*r1,-($x{1,8})\(r1\)/o;
86 } elsif ($arch eq 'powerpc') {
87 $re = qr/.*st[dw]u.*r1,-($x{1,8})\(r1\)/o;
88 } elsif ($arch =~ /^s390x?$/) {
89 # 11160: a7 fb ff 60 aghi %r15,-160
90 # or
91 # 100092: e3 f0 ff c8 ff 71 lay %r15,-56(%r15)
92 $re = qr/.*(?:lay|ag?hi).*\%r15,-(([0-9]{2}|[3-9])[0-9]{2})
93 (?:\(\%r15\))?$/ox;
94 } elsif ($arch =~ /^sh64$/) {
95 #XXX: we only check for the immediate case presently,
96 # though we will want to check for the movi/sub
97 # pair for larger users. -- PFM.
98 #a00048e0: d4fc40f0 addi.l r15,-240,r15
99 $re = qr/.*addi\.l.*r15,-(([0-9]{2}|[3-9])[0-9]{2}),r15/o;
100 } elsif ($arch =~ /^blackfin$/) {
101 # 0: 00 e8 38 01 LINK 0x4e0;
102 $re = qr/.*[[:space:]]LINK[[:space:]]*(0x$x{1,8})/o;
103 } elsif ($arch eq 'sparc' || $arch eq 'sparc64') {
104 # f0019d10: 9d e3 bf 90 save %sp, -112, %sp
105 $re = qr/.*save.*%sp, -(([0-9]{2}|[3-9])[0-9]{2}), %sp/o;
106 } else {
107 print("wrong or unknown architecture \"$arch\"\n");
108 exit
109 }
110}
111
112#
113# main()
114#
115my ($func, $file, $lastslash);
116
117while (my $line = <STDIN>) {
118 if ($line =~ m/$funcre/) {
119 $func = $1;
120 }
121 elsif ($line =~ m/(.*):\s*file format/) {
122 $file = $1;
123 $file =~ s/\.ko//;
124 $lastslash = rindex($file, "/");
125 if ($lastslash != -1) {
126 $file = substr($file, $lastslash + 1);
127 }
128 }
129 elsif ($line =~ m/$re/) {
130 my $size = $1;
131 $size = hex($size) if ($size =~ /^0x/);
132
133 if ($size > 0xf0000000) {
134 $size = - $size;
135 $size += 0x80000000;
136 $size += 0x80000000;
137 }
138 next if ($size > 0x10000000);
139
140 next if $line !~ m/^($xs*)/;
141 my $addr = $1;
142 $addr =~ s/ /0/g;
143 $addr = "0x$addr";
144
145 my $intro = "$addr $func [$file]:";
146 my $padlen = 56 - length($intro);
147 while ($padlen > 0) {
148 $intro .= ' ';
149 $padlen -= 8;
150 }
151 next if ($size < 100);
152 push @stack, "$intro$size\n";
153 }
154 elsif (defined $dre && $line =~ m/$dre/) {
155 my $size = "Dynamic ($1)";
156
157 next if $line !~ m/^($xs*)/;
158 my $addr = $1;
159 $addr =~ s/ /0/g;
160 $addr = "0x$addr";
161
162 my $intro = "$addr $func [$file]:";
163 my $padlen = 56 - length($intro);
164 while ($padlen > 0) {
165 $intro .= ' ';
166 $padlen -= 8;
167 }
168 push @stack, "$intro$size\n";
169 }
170}
171
172# Sort output by size (last field)
173print sort { ($b =~ /:\t*(\d+)$/)[0] <=> ($a =~ /:\t*(\d+)$/)[0] } @stack;