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 ;)
30 my (@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
93 sub bysize($) {
94 my ($asize, $bsize);
95 ($asize = $a) =~ s/.*: *(.*)$/$1/;
96 ($bsize = $b) =~ s/.*: *(.*)$/$1/;
97 $bsize <=> $asize
98 }
99
100 #
101 # main()
102 #
103 my $funcre = qr/^$x* <(.*)>:$/;
104 my $func;
105 my $file, $lastslash;
106
107 while (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
146 print sort bysize @stack;
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