xref: /openbmc/linux/scripts/checkstack.pl (revision f42b3800) 
1#!/usr/bin/perl
2
3#	Check the stack usage of functions
4#
5#	Copyright Joern Engel <joern@lazybastard.org>
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#	AVR32 port by Haavard Skinnemoen <hskinnemoen@atmel.com>
16#	PARISC port by Kyle McMartin <kyle@parisc-linux.org>
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# use anything else and feel the pain ;)
30my (@stack, $re, $x, $xs);
31{
32	my $arch = shift;
33	if ($arch eq "") {
34		$arch = `uname -m`;
35	}
36
37	$x	= "[0-9a-f]";	# hex character
38	$xs	= "[0-9a-f ]";	# hex character or space
39	if ($arch eq 'arm') {
40		#c0008ffc:	e24dd064	sub	sp, sp, #100	; 0x64
41		$re = qr/.*sub.*sp, sp, #(([0-9]{2}|[3-9])[0-9]{2})/o;
42	} elsif ($arch eq 'avr32') {
43		#8000008a:       20 1d           sub sp,4
44		#80000ca8:       fa cd 05 b0     sub sp,sp,1456
45		$re = qr/^.*sub.*sp.*,([0-9]{1,8})/o;
46	} elsif ($arch =~ /^i[3456]86$/) {
47		#c0105234:       81 ec ac 05 00 00       sub    $0x5ac,%esp
48		$re = qr/^.*[as][du][db]    \$(0x$x{1,8}),\%esp$/o;
49	} elsif ($arch eq 'x86_64') {
50		#    2f60:	48 81 ec e8 05 00 00 	sub    $0x5e8,%rsp
51		$re = qr/^.*[as][du][db]    \$(0x$x{1,8}),\%rsp$/o;
52	} elsif ($arch eq 'ia64') {
53		#e0000000044011fc:       01 0f fc 8c     adds r12=-384,r12
54		$re = qr/.*adds.*r12=-(([0-9]{2}|[3-9])[0-9]{2}),r12/o;
55	} elsif ($arch eq 'm68k') {
56		#    2b6c:       4e56 fb70       linkw %fp,#-1168
57		#  1df770:       defc ffe4       addaw #-28,%sp
58		$re = qr/.*(?:linkw %fp,|addaw )#-([0-9]{1,4})(?:,%sp)?$/o;
59	} elsif ($arch eq 'mips64') {
60		#8800402c:       67bdfff0        daddiu  sp,sp,-16
61		$re = qr/.*daddiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
62	} elsif ($arch eq 'mips') {
63		#88003254:       27bdffe0        addiu   sp,sp,-32
64		$re = qr/.*addiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
65	} elsif ($arch eq 'parisc' || $arch eq 'parisc64') {
66		$re = qr/.*ldo ($x{1,8})\(sp\),sp/o;
67	} elsif ($arch eq 'ppc') {
68		#c00029f4:       94 21 ff 30     stwu    r1,-208(r1)
69		$re = qr/.*stwu.*r1,-($x{1,8})\(r1\)/o;
70	} elsif ($arch eq 'ppc64') {
71		#XXX
72		$re = qr/.*stdu.*r1,-($x{1,8})\(r1\)/o;
73	} elsif ($arch eq 'powerpc') {
74		$re = qr/.*st[dw]u.*r1,-($x{1,8})\(r1\)/o;
75	} elsif ($arch =~ /^s390x?$/) {
76		#   11160:       a7 fb ff 60             aghi   %r15,-160
77		$re = qr/.*ag?hi.*\%r15,-(([0-9]{2}|[3-9])[0-9]{2})/o;
78	} elsif ($arch =~ /^sh64$/) {
79		#XXX: we only check for the immediate case presently,
80		#     though we will want to check for the movi/sub
81		#     pair for larger users. -- PFM.
82		#a00048e0:       d4fc40f0        addi.l  r15,-240,r15
83		$re = qr/.*addi\.l.*r15,-(([0-9]{2}|[3-9])[0-9]{2}),r15/o;
84	} elsif ($arch =~ /^blackfin$/) {
85		#   0:   00 e8 38 01     LINK 0x4e0;
86		$re = qr/.*[[:space:]]LINK[[:space:]]*(0x$x{1,8})/o;
87	} else {
88		print("wrong or unknown architecture\n");
89		exit
90	}
91}
92
93sub bysize($) {
94	my ($asize, $bsize);
95	($asize = $a) =~ s/.*:	*(.*)$/$1/;
96	($bsize = $b) =~ s/.*:	*(.*)$/$1/;
97	$bsize <=> $asize
98}
99
100#
101# main()
102#
103my $funcre = qr/^$x* <(.*)>:$/;
104my $func;
105my $file, $lastslash;
106
107while (my $line = <STDIN>) {
108	if ($line =~ m/$funcre/) {
109		$func = $1;
110	}
111	elsif ($line =~ m/(.*):\s*file format/) {
112		$file = $1;
113		$file =~ s/\.ko//;
114		$lastslash = rindex($file, "/");
115		if ($lastslash != -1) {
116			$file = substr($file, $lastslash + 1);
117		}
118	}
119	elsif ($line =~ m/$re/) {
120		my $size = $1;
121		$size = hex($size) if ($size =~ /^0x/);
122
123		if ($size > 0xf0000000) {
124			$size = - $size;
125			$size += 0x80000000;
126			$size += 0x80000000;
127		}
128		next if ($size > 0x10000000);
129
130		next if $line !~ m/^($xs*)/;
131		my $addr = $1;
132		$addr =~ s/ /0/g;
133		$addr = "0x$addr";
134
135		my $intro = "$addr $func [$file]:";
136		my $padlen = 56 - length($intro);
137		while ($padlen > 0) {
138			$intro .= '	';
139			$padlen -= 8;
140		}
141		next if ($size < 100);
142		push @stack, "$intro$size\n";
143	}
144}
145
146print sort bysize @stack;
147