3 # Check the stack usage of functions
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 # sparc port by Martin Habets <errandir_news@mph.eclipse.co.uk>
20 # objdump -d vmlinux | scripts/checkstack.pl [arch]
22 # find <moduledir> -name "*.o" | while read M; do
23 # objdump -d $M | perl ~/checkstack.pl <arch> | \
24 # sed "s/^/`basename $M`: /" ; done | \
25 # awk '/esp/ { print $5, $2, $4 }' | sort -nr
26 # TODO : Port to all architectures (one regex per arch)
30 # $re is used for two matches:
31 # $& (whole re) matches the complete objdump line with the stack growth
32 # $1 (first bracket) matches the size of the stack growth
34 # $dre is similar, but for dynamic stack redutions:
35 # $& (whole re) matches the complete objdump line with the stack growth
36 # $1 (first bracket) matches the dynamic amount of the stack growth
38 # use anything else and feel the pain ;)
39 my (@stack, $re, $dre, $x, $xs);
47 $x = "[0-9a-f]"; # hex character
48 $xs = "[0-9a-f ]"; # hex character or space
50 #c0008ffc: e24dd064 sub sp, sp, #100 ; 0x64
51 $re = qr/.*sub.*sp, sp, #(([0-9]{2}|[3-9])[0-9]{2})/o;
52 } elsif ($arch eq 'avr32') {
53 #8000008a: 20 1d sub sp,4
54 #80000ca8: fa cd 05 b0 sub sp,sp,1456
55 $re = qr/^.*sub.*sp.*,([0-9]{1,8})/o;
56 } elsif ($arch =~ /^i[3456]86$/) {
57 #c0105234: 81 ec ac 05 00 00 sub $0x5ac,%esp
58 $re = qr/^.*[as][du][db] \$(0x$x{1,8}),\%esp$/o;
59 $dre = qr/^.*[as][du][db] (%.*),\%esp$/o;
60 } elsif ($arch eq 'x86_64') {
61 # 2f60: 48 81 ec e8 05 00 00 sub $0x5e8,%rsp
62 $re = qr/^.*[as][du][db] \$(0x$x{1,8}),\%rsp$/o;
63 $dre = qr/^.*[as][du][db] (\%.*),\%rsp$/o;
64 } elsif ($arch eq 'ia64') {
65 #e0000000044011fc: 01 0f fc 8c adds r12=-384,r12
66 $re = qr/.*adds.*r12=-(([0-9]{2}|[3-9])[0-9]{2}),r12/o;
67 } elsif ($arch eq 'm68k') {
68 # 2b6c: 4e56 fb70 linkw %fp,#-1168
69 # 1df770: defc ffe4 addaw #-28,%sp
70 $re = qr/.*(?:linkw %fp,|addaw )#-([0-9]{1,4})(?:,%sp)?$/o;
71 } elsif ($arch eq 'mips64') {
72 #8800402c: 67bdfff0 daddiu sp,sp,-16
73 $re = qr/.*daddiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
74 } elsif ($arch eq 'mips') {
75 #88003254: 27bdffe0 addiu sp,sp,-32
76 $re = qr/.*addiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
77 } elsif ($arch eq 'parisc' || $arch eq 'parisc64') {
78 $re = qr/.*ldo ($x{1,8})\(sp\),sp/o;
79 } elsif ($arch eq 'ppc') {
80 #c00029f4: 94 21 ff 30 stwu r1,-208(r1)
81 $re = qr/.*stwu.*r1,-($x{1,8})\(r1\)/o;
82 } elsif ($arch eq 'ppc64') {
84 $re = qr/.*stdu.*r1,-($x{1,8})\(r1\)/o;
85 } elsif ($arch eq 'powerpc') {
86 $re = qr/.*st[dw]u.*r1,-($x{1,8})\(r1\)/o;
87 } elsif ($arch =~ /^s390x?$/) {
88 # 11160: a7 fb ff 60 aghi %r15,-160
90 # 100092: e3 f0 ff c8 ff 71 lay %r15,-56(%r15)
91 $re = qr/.*(?:lay|ag?hi).*\%r15,-(([0-9]{2}|[3-9])[0-9]{2})
93 } elsif ($arch =~ /^sh64$/) {
94 #XXX: we only check for the immediate case presently,
95 # though we will want to check for the movi/sub
96 # pair for larger users. -- PFM.
97 #a00048e0: d4fc40f0 addi.l r15,-240,r15
98 $re = qr/.*addi\.l.*r15,-(([0-9]{2}|[3-9])[0-9]{2}),r15/o;
99 } elsif ($arch =~ /^blackfin$/) {
100 # 0: 00 e8 38 01 LINK 0x4e0;
101 $re = qr/.*[[:space:]]LINK[[:space:]]*(0x$x{1,8})/o;
102 } elsif ($arch eq 'sparc' || $arch eq 'sparc64') {
103 # f0019d10: 9d e3 bf 90 save %sp, -112, %sp
104 $re = qr/.*save.*%sp, -(([0-9]{2}|[3-9])[0-9]{2}), %sp/o;
106 print("wrong or unknown architecture \"$arch\"\n");
113 ($asize = $a) =~ s/.*: *(.*)$/$1/;
114 ($bsize = $b) =~ s/.*: *(.*)$/$1/;
121 my $funcre = qr/^$x* <(.*)>:$/;
123 my $file, $lastslash;
125 while (my $line = <STDIN>) {
126 if ($line =~ m/$funcre/) {
129 elsif ($line =~ m/(.*):\s*file format/) {
132 $lastslash = rindex($file, "/");
133 if ($lastslash != -1) {
134 $file = substr($file, $lastslash + 1);
137 elsif ($line =~ m/$re/) {
139 $size = hex($size) if ($size =~ /^0x/);
141 if ($size > 0xf0000000) {
146 next if ($size > 0x10000000);
148 next if $line !~ m/^($xs*)/;
153 # my $intro = "$addr $func [$file]:";
154 # my $padlen = 56 - length($intro);
155 # while ($padlen > 0) {
159 # next if ($size < 100);
160 # push @stack, "$intro$size\n";
161 push @stack, "$size $file:$func\n";
163 elsif (defined $dre && $line =~ m/$dre/) {
164 my $size = "Dynamic ($1)";
166 next if $line !~ m/^($xs*)/;
171 # my $intro = "$addr $func [$file]:";
172 # my $padlen = 56 - length($intro);
173 # while ($padlen > 0) {
177 # push @stack, "$intro$size\n";
178 push @stack, "$size $file:$func\n";
182 print sort bysize @stack;