FilesExpand file tree

 master

/

checkstack.pl

Copy path

Blame

More file actions

Blame

More file actions

Latest commit

 

History

History

History

executable file

·

208 lines (188 loc) · 5.96 KB

 master

/

checkstack.pl

Copy path

Top

File metadata and controls

• Code
• Blame

executable file

·

208 lines (188 loc) · 5.96 KB

Raw

Copy raw file

Download raw file

Open symbols panel

Edit and raw actions

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

75

76

77

78

79

80

81

82

83

84

85

86

87

88

89

90

91

92

93

94

95

96

97

98

99

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

176

177

178

179

180

181

182

183

184

185

186

187

188

189

190

191

192

193

194

195

196

197

198

199

200

201

202

203

204

205

206

207

208

#!/usr/bin/env perl

# SPDX-License-Identifier: GPL-2.0

# Check the stack usage of functions

#

# Copyright Joern Engel <joern@lazybastard.org>

# Inspired by Linus Torvalds

# Original idea maybe from Keith Owens

# s390 port and big speedup by Arnd Bergmann <arnd@bergmann-dalldorf.de>

# Mips port by Juan Quintela <quintela@mandrakesoft.com>

# Arm port by Holger Schurig

# Random bits by Matt Mackall <mpm@selenic.com>

# M68k port by Geert Uytterhoeven and Andreas Schwab

# AArch64, PARISC ports by Kyle McMartin

# sparc port by Martin Habets <errandir_news@mph.eclipse.co.uk>

# ppc64le port by Breno Leitao <leitao@debian.org>

# riscv port by Wadim Mueller <wafgo01@gmail.com>

# loongarch port by Youling Tang <tangyouling@kylinos.cn>

#

# Usage:

# objdump -d vmlinux | scripts/checkstack.pl [arch] [min_stack]

#

# TODO : Port to all architectures (one regex per arch)

use strict;

# check for arch

#

# $re is used for two matches:

# $& (whole re) matches the complete objdump line with the stack growth

# $1 (first bracket) matches the size of the stack growth

#

# $dre is similar, but for dynamic stack redutions:

# $& (whole re) matches the complete objdump line with the stack growth

# $1 (first bracket) matches the dynamic amount of the stack growth

#

# $sub: subroutine for special handling to check stack usage.

#

# use anything else and feel the pain ;)

my (@stack, $re, $dre, $sub, $x, $xs, $funcre, $min_stack);

{

my $arch = shift;

if ($arch eq "") {

$arch = `uname -m`;

chomp($arch);

}

$min_stack = shift;

if ($min_stack eq "" || $min_stack !~ /^\d+$/) {

$min_stack = 512;

}

$x = "[0-9a-f]"; # hex character

$xs = "[0-9a-f ]"; # hex character or space

$funcre = qr/^$x* <(.*)>:$/;

if ($arch =~ '^(aarch|arm)64$') {

#ffffffc0006325cc: a9bb7bfd stp x29, x30, [sp, #-80]!

#a110: d11643ff sub sp, sp, #0x590

$re = qr/^.*stp.*sp, ?\#-([0-9]{1,8})\]\!/o;

$dre = qr/^.*sub.*sp, sp, #(0x$x{1,8})/o;

} elsif ($arch eq 'arm') {

#c0008ffc: e24dd064 sub sp, sp, #100 ; 0x64

$re = qr/.*sub.*sp, sp, #([0-9]{1,4})/o;

$sub = \&arm_push_handling;

} elsif ($arch =~ /^x86(_64)?$/ || $arch =~ /^i[3456]86$/) {

#c0105234: 81 ec ac 05 00 00 sub $0x5ac,%esp

# or

# 2f60: 48 81 ec e8 05 00 00 sub $0x5e8,%rsp

$re = qr/^.*[as][du][db] \$(0x$x{1,8}),\%(e|r)sp$/o;

$dre = qr/^.*[as][du][db] (%.*),\%(e|r)sp$/o;

} elsif ($arch eq 'm68k') {

# 2b6c: 4e56 fb70 linkw %fp,#-1168

# 1df770: defc ffe4 addaw #-28,%sp

$re = qr/.*(?:linkw %fp,|addaw )#-([0-9]{1,4})(?:,%sp)?$/o;

} elsif ($arch eq 'mips64') {

#8800402c: 67bdfff0 daddiu sp,sp,-16

$re = qr/.*daddiu.*sp,sp,-([0-9]{1,8})/o;

} elsif ($arch eq 'mips') {

#88003254: 27bdffe0 addiu sp,sp,-32

$re = qr/.*addiu.*sp,sp,-([0-9]{1,8})/o;

} elsif ($arch eq 'nios2') {

#25a8: defffb04 addi sp,sp,-20

$re = qr/.*addi.*sp,sp,-([0-9]{1,8})/o;

} elsif ($arch eq 'openrisc') {

# c000043c: 9c 21 fe f0 l.addi r1,r1,-272

$re = qr/.*l\.addi.*r1,r1,-([0-9]{1,8})/o;

} elsif ($arch eq 'parisc' || $arch eq 'parisc64') {

$re = qr/.*ldo ($x{1,8})\(sp\),sp/o;

} elsif ($arch eq 'powerpc' || $arch =~ /^ppc(64)?(le)?$/ ) {

# powerpc : 94 21 ff 30 stwu r1,-208(r1)

# ppc64(le) : 81 ff 21 f8 stdu r1,-128(r1)

$re = qr/.*st[dw]u.*r1,-($x{1,8})\(r1\)/o;

} elsif ($arch =~ /^s390x?$/) {

# 11160: a7 fb ff 60 aghi %r15,-160

# or

# 100092: e3 f0 ff c8 ff 71 lay %r15,-56(%r15)

$re = qr/.*(?:lay|ag?hi).*\%r15,-([0-9]+)(?:\(\%r15\))?$/o;

} elsif ($arch eq 'sparc' || $arch eq 'sparc64') {

# f0019d10: 9d e3 bf 90 save %sp, -112, %sp

$re = qr/.*save.*%sp, -([0-9]{1,8}), %sp/o;

} elsif ($arch =~ /^riscv(64)?$/) {

#ffffffff8036e868: c2010113 addi sp,sp,-992

$re = qr/.*addi.*sp,sp,-([0-9]{1,8})/o;

} elsif ($arch =~ /^loongarch(32|64)?$/) {

#9000000000224708: 02ff4063 addi.d $sp, $sp, -48(0xfd0)

$re = qr/.*addi\..*sp, .*sp, -([0-9]{1,8}).*/o;

} else {

print("wrong or unknown architecture \"$arch\"\n");

exit

}

}

#

# To count stack usage of push {*, fp, ip, lr, pc} instruction in ARM,

# if FRAME POINTER is enabled.

# e.g. c01f0d48: e92ddff0 push {r4, r5, r6, r7, r8, r9, sl, fp, ip, lr, pc}

#

sub arm_push_handling {

my $regex = qr/.*push.*fp, ip, lr, pc}/o;

my $size = 0;

my $line_arg = shift;

if ($line_arg =~ m/$regex/) {

$size = $line_arg =~ tr/,//;

$size = ($size + 1) * 4;

}

return $size;

}

#

# main()

#

my ($func, $file, $lastslash, $total_size, $addr, $intro);

$total_size = 0;

while (my $line = <STDIN>) {

if ($line =~ m/$funcre/) {

$func = $1;

next if $line !~ m/^($x*)/;

if ($total_size > $min_stack) {

push @stack, "$intro$total_size\n";

}

$addr = "0x$1";

$intro = "$addr $func [$file]:";

my $padlen = 56 - length($intro);

while ($padlen > 0) {

$intro .= ' ';

$padlen -= 8;

}

$total_size = 0;

}

elsif ($line =~ m/(.*):\s*file format/) {

$file = $1;

$file =~ s/\.ko//;

$lastslash = rindex($file, "/");

if ($lastslash != -1) {

$file = substr($file, $lastslash + 1);

}

}

elsif ($line =~ m/$re/) {

my $size = $1;

$size = hex($size) if ($size =~ /^0x/);

if ($size > 0xf0000000) {

$size = - $size;

$size += 0x80000000;

$size += 0x80000000;

}

next if ($size > 0x10000000);

$total_size += $size;

}

elsif (defined $dre && $line =~ m/$dre/) {

my $size = $1;

$size = hex($size) if ($size =~ /^0x/);

$total_size += $size;

}

elsif (defined $sub) {

my $size = &$sub($line);

$total_size += $size;

}

}

if ($total_size > $min_stack) {

push @stack, "$intro$total_size\n";

}

# Sort output by size (last field) and function name if size is the same

sub sort_lines {

my ($a, $b) = @_;

my $num_a = $1 if $a =~ /:\t*(\d+)$/;

my $num_b = $1 if $b =~ /:\t*(\d+)$/;

my $func_a = $1 if $a =~ / (.*):/;

my $func_b = $1 if $b =~ / (.*):/;

if ($num_a != $num_b) {

return $num_b <=> $num_a;

} else {

return $func_a cmp $func_b;

}

}

print sort { sort_lines($a, $b) } @stack;