2 # SPDX-License-Identifier: GPL-2.0
4 # Check the stack usage of functions
6 # Copyright Joern Engel <joern@lazybastard.org>
7 # Inspired by Linus Torvalds
8 # Original idea maybe from Keith Owens
9 # s390 port and big speedup by Arnd Bergmann <arnd@bergmann-dalldorf.de>
10 # Mips port by Juan Quintela <quintela@mandrakesoft.com>
11 # IA64 port via Andreas Dilger
12 # Arm port by Holger Schurig
13 # sh64 port by Paul Mundt
14 # Random bits by Matt Mackall <mpm@selenic.com>
15 # M68k port by Geert Uytterhoeven and Andreas Schwab
16 # AArch64, PARISC ports by Kyle McMartin
17 # sparc port by Martin Habets <errandir_news@mph.eclipse.co.uk>
18 # ppc64le port by Breno Leitao <leitao@debian.org>
21 # objdump -d vmlinux | scripts/checkstack.pl [arch]
23 # TODO : Port to all architectures (one regex per arch)
29 # $re is used for two matches:
30 # $& (whole re) matches the complete objdump line with the stack growth
31 # $1 (first bracket) matches the size of the stack growth
33 # $dre is similar, but for dynamic stack redutions:
34 # $& (whole re) matches the complete objdump line with the stack growth
35 # $1 (first bracket) matches the dynamic amount of the stack growth
37 # use anything else and feel the pain ;)
38 my (@stack, $re, $dre, $x, $xs, $funcre);
46 $x = "[0-9a-f]"; # hex character
47 $xs = "[0-9a-f ]"; # hex character or space
48 $funcre = qr/^$x* <(.*)>:$/;
49 if ($arch eq 'aarch64') {
50 #ffffffc0006325cc: a9bb7bfd stp x29, x30, [sp,#-80]!
51 $re = qr/^.*stp.*sp,\#-([0-9]{1,8})\]\!/o;
52 } elsif ($arch eq 'arm') {
53 #c0008ffc: e24dd064 sub sp, sp, #100 ; 0x64
54 $re = qr/.*sub.*sp, sp, #(([0-9]{2}|[3-9])[0-9]{2})/o;
55 } elsif ($arch =~ /^x86(_64)?$/ || $arch =~ /^i[3456]86$/) {
56 #c0105234: 81 ec ac 05 00 00 sub $0x5ac,%esp
58 # 2f60: 48 81 ec e8 05 00 00 sub $0x5e8,%rsp
59 $re = qr/^.*[as][du][db] \$(0x$x{1,8}),\%(e|r)sp$/o;
60 $dre = qr/^.*[as][du][db] (%.*),\%(e|r)sp$/o;
61 } elsif ($arch eq 'ia64') {
62 #e0000000044011fc: 01 0f fc 8c adds r12=-384,r12
63 $re = qr/.*adds.*r12=-(([0-9]{2}|[3-9])[0-9]{2}),r12/o;
64 } elsif ($arch eq 'm68k') {
65 # 2b6c: 4e56 fb70 linkw %fp,#-1168
66 # 1df770: defc ffe4 addaw #-28,%sp
67 $re = qr/.*(?:linkw %fp,|addaw )#-([0-9]{1,4})(?:,%sp)?$/o;
68 } elsif ($arch eq 'mips64') {
69 #8800402c: 67bdfff0 daddiu sp,sp,-16
70 $re = qr/.*daddiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
71 } elsif ($arch eq 'mips') {
72 #88003254: 27bdffe0 addiu sp,sp,-32
73 $re = qr/.*addiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
74 } elsif ($arch eq 'nios2') {
75 #25a8: defffb04 addi sp,sp,-20
76 $re = qr/.*addi.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
77 } elsif ($arch eq 'openrisc') {
78 # c000043c: 9c 21 fe f0 l.addi r1,r1,-272
79 $re = qr/.*l\.addi.*r1,r1,-(([0-9]{2}|[3-9])[0-9]{2})/o;
80 } elsif ($arch eq 'parisc' || $arch eq 'parisc64') {
81 $re = qr/.*ldo ($x{1,8})\(sp\),sp/o;
82 } elsif ($arch eq 'powerpc' || $arch =~ /^ppc(64)?(le)?$/ ) {
83 # powerpc : 94 21 ff 30 stwu r1,-208(r1)
84 # ppc64(le) : 81 ff 21 f8 stdu r1,-128(r1)
85 $re = qr/.*st[dw]u.*r1,-($x{1,8})\(r1\)/o;
86 } elsif ($arch =~ /^s390x?$/) {
87 # 11160: a7 fb ff 60 aghi %r15,-160
89 # 100092: e3 f0 ff c8 ff 71 lay %r15,-56(%r15)
90 $re = qr/.*(?:lay|ag?hi).*\%r15,-(([0-9]{2}|[3-9])[0-9]{2})
92 } elsif ($arch =~ /^sh64$/) {
93 #XXX: we only check for the immediate case presently,
94 # though we will want to check for the movi/sub
95 # pair for larger users. -- PFM.
96 #a00048e0: d4fc40f0 addi.l r15,-240,r15
97 $re = qr/.*addi\.l.*r15,-(([0-9]{2}|[3-9])[0-9]{2}),r15/o;
98 } elsif ($arch eq 'sparc' || $arch eq 'sparc64') {
99 # f0019d10: 9d e3 bf 90 save %sp, -112, %sp
100 $re = qr/.*save.*%sp, -(([0-9]{2}|[3-9])[0-9]{2}), %sp/o;
102 print("wrong or unknown architecture \"$arch\"\n");
110 my ($func, $file, $lastslash);
112 while (my $line = <STDIN>) {
113 if ($line =~ m/$funcre/) {
116 elsif ($line =~ m/(.*):\s*file format/) {
119 $lastslash = rindex($file, "/");
120 if ($lastslash != -1) {
121 $file = substr($file, $lastslash + 1);
124 elsif ($line =~ m/$re/) {
126 $size = hex($size) if ($size =~ /^0x/);
128 if ($size > 0xf0000000) {
133 next if ($size > 0x10000000);
135 next if $line !~ m/^($xs*)/;
140 my $intro = "$addr $func [$file]:";
141 my $padlen = 56 - length($intro);
142 while ($padlen > 0) {
146 next if ($size < 100);
147 push @stack, "$intro$size\n";
149 elsif (defined $dre && $line =~ m/$dre/) {
150 my $size = "Dynamic ($1)";
152 next if $line !~ m/^($xs*)/;
157 my $intro = "$addr $func [$file]:";
158 my $padlen = 56 - length($intro);
159 while ($padlen > 0) {
163 push @stack, "$intro$size\n";
167 # Sort output by size (last field)
168 print sort { ($b =~ /:\t*(\d+)$/)[0] <=> ($a =~ /:\t*(\d+)$/)[0] } @stack;