summaryrefslogtreecommitdiffstats
path: root/scripts/checkstack.pl
blob: 358f96c75b43b831868fc93c6ed90233a3ea6a71 (plain)
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
#!/usr/bin/perl

#	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>
#	IA64 port via Andreas Dilger
#	Arm port by Holger Schurig
#	sh64 port by Paul Mundt
#	Random bits by Matt Mackall <mpm@selenic.com>
#	M68k port by Geert Uytterhoeven and Andreas Schwab
#	AVR32 port by Haavard Skinnemoen <hskinnemoen@atmel.com>
#	PARISC port by Kyle McMartin <kyle@parisc-linux.org>
#
#	Usage:
#	objdump -d vmlinux | scripts/checkstack.pl [arch]
#
#	TODO :	Port to all architectures (one regex per arch)

# 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
#
# use anything else and feel the pain ;)
my (@stack, $re, $dre, $x, $xs);
{
	my $arch = shift;
	if ($arch eq "") {
		$arch = `uname -m`;
	}

	$x	= "[0-9a-f]";	# hex character
	$xs	= "[0-9a-f ]";	# hex character or space
	if ($arch eq 'arm') {
		#c0008ffc:	e24dd064	sub	sp, sp, #100	; 0x64
		$re = qr/.*sub.*sp, sp, #(([0-9]{2}|[3-9])[0-9]{2})/o;
	} elsif ($arch eq 'avr32') {
		#8000008a:       20 1d           sub sp,4
		#80000ca8:       fa cd 05 b0     sub sp,sp,1456
		$re = qr/^.*sub.*sp.*,([0-9]{1,8})/o;
	} elsif ($arch =~ /^i[3456]86$/) {
		#c0105234:       81 ec ac 05 00 00       sub    $0x5ac,%esp
		$re = qr/^.*[as][du][db]    \$(0x$x{1,8}),\%esp$/o;
		$dre = qr/^.*[as][du][db]    (%.*),\%esp$/o;
	} elsif ($arch eq 'x86_64') {
		#    2f60:	48 81 ec e8 05 00 00 	sub    $0x5e8,%rsp
		$re = qr/^.*[as][du][db]    \$(0x$x{1,8}),\%rsp$/o;
		$dre = qr/^.*[as][du][db]    (\%.*),\%rsp$/o;
	} elsif ($arch eq 'ia64') {
		#e0000000044011fc:       01 0f fc 8c     adds r12=-384,r12
		$re = qr/.*adds.*r12=-(([0-9]{2}|[3-9])[0-9]{2}),r12/o;
	} elsif ($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
		$re = qr/.*daddiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
	} elsif ($arch eq 'mips') {
		#88003254:       27bdffe0        addiu   sp,sp,-32
		$re = qr/.*addiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
	} elsif ($arch eq 'parisc' || $arch eq 'parisc64') {
		$re = qr/.*ldo ($x{1,8})\(sp\),sp/o;
	} elsif ($arch eq 'ppc') {
		#c00029f4:       94 21 ff 30     stwu    r1,-208(r1)
		$re = qr/.*stwu.*r1,-($x{1,8})\(r1\)/o;
	} elsif ($arch eq 'ppc64') {
		#XXX
		$re = qr/.*stdu.*r1,-($x{1,8})\(r1\)/o;
	} elsif ($arch eq 'powerpc') {
		$re = qr/.*st[dw]u.*r1,-($x{1,8})\(r1\)/o;
	} elsif ($arch =~ /^s390x?$/) {
		#   11160:       a7 fb ff 60             aghi   %r15,-160
		$re = qr/.*ag?hi.*\%r15,-(([0-9]{2}|[3-9])[0-9]{2})/o;
	} elsif ($arch =~ /^sh64$/) {
		#XXX: we only check for the immediate case presently,
		#     though we will want to check for the movi/sub
		#     pair for larger users. -- PFM.
		#a00048e0:       d4fc40f0        addi.l  r15,-240,r15
		$re = qr/.*addi\.l.*r15,-(([0-9]{2}|[3-9])[0-9]{2}),r15/o;
	} elsif ($arch =~ /^blackfin$/) {
		#   0:   00 e8 38 01     LINK 0x4e0;
		$re = qr/.*[[:space:]]LINK[[:space:]]*(0x$x{1,8})/o;
	} else {
		print("wrong or unknown architecture\n");
		exit
	}
}

sub bysize($) {
	my ($asize, $bsize);
	($asize = $a) =~ s/.*:	*(.*)$/$1/;
	($bsize = $b) =~ s/.*:	*(.*)$/$1/;
	$bsize <=> $asize
}

#
# main()
#
my $funcre = qr/^$x* <(.*)>:$/;
my $func;
my $file, $lastslash;

while (my $line = <STDIN>) {
	if ($line =~ m/$funcre/) {
		$func = $1;
	}
	elsif ($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);

		next if $line !~ m/^($xs*)/;
		my $addr = $1;
		$addr =~ s/ /0/g;
		$addr = "0x$addr";

		my $intro = "$addr $func [$file]:";
		my $padlen = 56 - length($intro);
		while ($padlen > 0) {
			$intro .= '	';
			$padlen -= 8;
		}
		next if ($size < 100);
		push @stack, "$intro$size\n";
	}
	elsif (defined $dre && $line =~ m/$dre/) {
		my $size = "Dynamic ($1)";

		next if $line !~ m/^($xs*)/;
		my $addr = $1;
		$addr =~ s/ /0/g;
		$addr = "0x$addr";

		my $intro = "$addr $func [$file]:";
		my $padlen = 56 - length($intro);
		while ($padlen > 0) {
			$intro .= '	';
			$padlen -= 8;
		}
		push @stack, "$intro$size\n";
	}
}

print sort bysize @stack;