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 # AArch64, PARISC ports by Kyle McMartin
16 # sparc port by Martin Habets <errandir_news@mph.eclipse.co.uk>
19 # objdump -d vmlinux | scripts/checkstack.pl [arch]
21 # TODO : Port to all architectures (one regex per arch)
27 # $re is used for two matches:
28 # $& (whole re) matches the complete objdump line with the stack growth
29 # $1 (first bracket) matches the size of the stack growth
31 # $dre is similar, but for dynamic stack redutions:
32 # $& (whole re) matches the complete objdump line with the stack growth
33 # $1 (first bracket) matches the dynamic amount of the stack growth
35 # use anything else and feel the pain ;)
36 my (@stack, $re, $dre, $x, $xs, $funcre);
44 $x = "[0-9a-f]"; # hex character
45 $xs = "[0-9a-f ]"; # hex character or space
46 $funcre = qr/^$x* <(.*)>:$/;
47 if ($arch eq 'aarch64') {
48 #ffffffc0006325cc: a9bb7bfd stp x29, x30, [sp,#-80]!
49 $re = qr/^.*stp.*sp,\#-([0-9]{1,8})\]\!/o;
50 } elsif ($arch eq 'arm') {
51 #c0008ffc: e24dd064 sub sp, sp, #100 ; 0x64
52 $re = qr/.*sub.*sp, sp, #(([0-9]{2}|[3-9])[0-9]{2})/o;
53 } elsif ($arch =~ /^x86(_64)?$/ || $arch =~ /^i[3456]86$/) {
54 #c0105234: 81 ec ac 05 00 00 sub $0x5ac,%esp
56 # 2f60: 48 81 ec e8 05 00 00 sub $0x5e8,%rsp
57 $re = qr/^.*[as][du][db] \$(0x$x{1,8}),\%(e|r)sp$/o;
58 $dre = qr/^.*[as][du][db] (%.*),\%(e|r)sp$/o;
59 } elsif ($arch eq 'ia64') {
60 #e0000000044011fc: 01 0f fc 8c adds r12=-384,r12
61 $re = qr/.*adds.*r12=-(([0-9]{2}|[3-9])[0-9]{2}),r12/o;
62 } elsif ($arch eq 'm68k') {
63 # 2b6c: 4e56 fb70 linkw %fp,#-1168
64 # 1df770: defc ffe4 addaw #-28,%sp
65 $re = qr/.*(?:linkw %fp,|addaw )#-([0-9]{1,4})(?:,%sp)?$/o;
66 } elsif ($arch eq 'metag') {
67 #400026fc: 40 00 00 82 ADD A0StP,A0StP,#0x8
68 $re = qr/.*ADD.*A0StP,A0StP,\#(0x$x{1,8})/o;
69 $funcre = qr/^$x* <[^\$](.*)>:$/;
70 } elsif ($arch eq 'mips64') {
71 #8800402c: 67bdfff0 daddiu sp,sp,-16
72 $re = qr/.*daddiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
73 } elsif ($arch eq 'mips') {
74 #88003254: 27bdffe0 addiu sp,sp,-32
75 $re = qr/.*addiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
76 } elsif ($arch eq 'nios2') {
77 #25a8: defffb04 addi sp,sp,-20
78 $re = qr/.*addi.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
79 } elsif ($arch eq 'openrisc') {
80 # c000043c: 9c 21 fe f0 l.addi r1,r1,-272
81 $re = qr/.*l\.addi.*r1,r1,-(([0-9]{2}|[3-9])[0-9]{2})/o;
82 } elsif ($arch eq 'parisc' || $arch eq 'parisc64') {
83 $re = qr/.*ldo ($x{1,8})\(sp\),sp/o;
84 } elsif ($arch eq 'ppc') {
85 #c00029f4: 94 21 ff 30 stwu r1,-208(r1)
86 $re = qr/.*stwu.*r1,-($x{1,8})\(r1\)/o;
87 } elsif ($arch eq 'ppc64') {
89 $re = qr/.*stdu.*r1,-($x{1,8})\(r1\)/o;
90 } elsif ($arch eq 'powerpc') {
91 $re = qr/.*st[dw]u.*r1,-($x{1,8})\(r1\)/o;
92 } elsif ($arch =~ /^s390x?$/) {
93 # 11160: a7 fb ff 60 aghi %r15,-160
95 # 100092: e3 f0 ff c8 ff 71 lay %r15,-56(%r15)
96 $re = qr/.*(?:lay|ag?hi).*\%r15,-(([0-9]{2}|[3-9])[0-9]{2})
98 } elsif ($arch =~ /^sh64$/) {
99 #XXX: we only check for the immediate case presently,
100 # though we will want to check for the movi/sub
101 # pair for larger users. -- PFM.
102 #a00048e0: d4fc40f0 addi.l r15,-240,r15
103 $re = qr/.*addi\.l.*r15,-(([0-9]{2}|[3-9])[0-9]{2}),r15/o;
104 } elsif ($arch =~ /^blackfin$/) {
105 # 0: 00 e8 38 01 LINK 0x4e0;
106 $re = qr/.*[[:space:]]LINK[[:space:]]*(0x$x{1,8})/o;
107 } elsif ($arch eq 'sparc' || $arch eq 'sparc64') {
108 # f0019d10: 9d e3 bf 90 save %sp, -112, %sp
109 $re = qr/.*save.*%sp, -(([0-9]{2}|[3-9])[0-9]{2}), %sp/o;
111 print("wrong or unknown architecture \"$arch\"\n");
119 my ($func, $file, $lastslash);
121 while (my $line = <STDIN>) {
122 if ($line =~ m/$funcre/) {
125 elsif ($line =~ m/(.*):\s*file format/) {
128 $lastslash = rindex($file, "/");
129 if ($lastslash != -1) {
130 $file = substr($file, $lastslash + 1);
133 elsif ($line =~ m/$re/) {
135 $size = hex($size) if ($size =~ /^0x/);
137 if ($size > 0xf0000000) {
142 next if ($size > 0x10000000);
144 next if $line !~ m/^($xs*)/;
149 my $intro = "$addr $func [$file]:";
150 my $padlen = 56 - length($intro);
151 while ($padlen > 0) {
155 next if ($size < 100);
156 push @stack, "$intro$size\n";
158 elsif (defined $dre && $line =~ m/$dre/) {
159 my $size = "Dynamic ($1)";
161 next if $line !~ m/^($xs*)/;
166 my $intro = "$addr $func [$file]:";
167 my $padlen = 56 - length($intro);
168 while ($padlen > 0) {
172 push @stack, "$intro$size\n";
176 # Sort output by size (last field)
177 print sort { ($b =~ /:\t*(\d+)$/)[0] <=> ($a =~ /:\t*(\d+)$/)[0] } @stack;