Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[cris-mirror.git] / scripts / checkstack.pl
blobcb993801e4b238a858dfc9b490c9242686a3e226
1 #!/usr/bin/env perl
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>
19 # Usage:
20 # objdump -d vmlinux | scripts/checkstack.pl [arch]
22 # TODO : Port to all architectures (one regex per arch)
24 use strict;
26 # check for arch
28 # $re is used for two matches:
29 # $& (whole re) matches the complete objdump line with the stack growth
30 # $1 (first bracket) matches the size of the stack growth
32 # $dre is similar, but for dynamic stack redutions:
33 # $& (whole re) matches the complete objdump line with the stack growth
34 # $1 (first bracket) matches the dynamic amount of the stack growth
36 # use anything else and feel the pain ;)
37 my (@stack, $re, $dre, $x, $xs, $funcre);
39 my $arch = shift;
40 if ($arch eq "") {
41 $arch = `uname -m`;
42 chomp($arch);
45 $x = "[0-9a-f]"; # hex character
46 $xs = "[0-9a-f ]"; # hex character or space
47 $funcre = qr/^$x* <(.*)>:$/;
48 if ($arch eq 'aarch64') {
49 #ffffffc0006325cc: a9bb7bfd stp x29, x30, [sp,#-80]!
50 $re = qr/^.*stp.*sp,\#-([0-9]{1,8})\]\!/o;
51 } elsif ($arch eq 'arm') {
52 #c0008ffc: e24dd064 sub sp, sp, #100 ; 0x64
53 $re = qr/.*sub.*sp, sp, #(([0-9]{2}|[3-9])[0-9]{2})/o;
54 } elsif ($arch =~ /^x86(_64)?$/ || $arch =~ /^i[3456]86$/) {
55 #c0105234: 81 ec ac 05 00 00 sub $0x5ac,%esp
56 # or
57 # 2f60: 48 81 ec e8 05 00 00 sub $0x5e8,%rsp
58 $re = qr/^.*[as][du][db] \$(0x$x{1,8}),\%(e|r)sp$/o;
59 $dre = qr/^.*[as][du][db] (%.*),\%(e|r)sp$/o;
60 } elsif ($arch eq 'ia64') {
61 #e0000000044011fc: 01 0f fc 8c adds r12=-384,r12
62 $re = qr/.*adds.*r12=-(([0-9]{2}|[3-9])[0-9]{2}),r12/o;
63 } elsif ($arch eq 'm68k') {
64 # 2b6c: 4e56 fb70 linkw %fp,#-1168
65 # 1df770: defc ffe4 addaw #-28,%sp
66 $re = qr/.*(?:linkw %fp,|addaw )#-([0-9]{1,4})(?:,%sp)?$/o;
67 } elsif ($arch eq 'metag') {
68 #400026fc: 40 00 00 82 ADD A0StP,A0StP,#0x8
69 $re = qr/.*ADD.*A0StP,A0StP,\#(0x$x{1,8})/o;
70 $funcre = qr/^$x* <[^\$](.*)>:$/;
71 } elsif ($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 'nios2') {
78 #25a8: defffb04 addi sp,sp,-20
79 $re = qr/.*addi.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
80 } elsif ($arch eq 'openrisc') {
81 # c000043c: 9c 21 fe f0 l.addi r1,r1,-272
82 $re = qr/.*l\.addi.*r1,r1,-(([0-9]{2}|[3-9])[0-9]{2})/o;
83 } elsif ($arch eq 'parisc' || $arch eq 'parisc64') {
84 $re = qr/.*ldo ($x{1,8})\(sp\),sp/o;
85 } elsif ($arch eq 'ppc') {
86 #c00029f4: 94 21 ff 30 stwu r1,-208(r1)
87 $re = qr/.*stwu.*r1,-($x{1,8})\(r1\)/o;
88 } elsif ($arch eq 'ppc64') {
89 #XXX
90 $re = qr/.*stdu.*r1,-($x{1,8})\(r1\)/o;
91 } elsif ($arch eq 'powerpc') {
92 $re = qr/.*st[dw]u.*r1,-($x{1,8})\(r1\)/o;
93 } elsif ($arch =~ /^s390x?$/) {
94 # 11160: a7 fb ff 60 aghi %r15,-160
95 # or
96 # 100092: e3 f0 ff c8 ff 71 lay %r15,-56(%r15)
97 $re = qr/.*(?:lay|ag?hi).*\%r15,-(([0-9]{2}|[3-9])[0-9]{2})
98 (?:\(\%r15\))?$/ox;
99 } elsif ($arch =~ /^sh64$/) {
100 #XXX: we only check for the immediate case presently,
101 # though we will want to check for the movi/sub
102 # pair for larger users. -- PFM.
103 #a00048e0: d4fc40f0 addi.l r15,-240,r15
104 $re = qr/.*addi\.l.*r15,-(([0-9]{2}|[3-9])[0-9]{2}),r15/o;
105 } elsif ($arch =~ /^blackfin$/) {
106 # 0: 00 e8 38 01 LINK 0x4e0;
107 $re = qr/.*[[:space:]]LINK[[:space:]]*(0x$x{1,8})/o;
108 } elsif ($arch eq 'sparc' || $arch eq 'sparc64') {
109 # f0019d10: 9d e3 bf 90 save %sp, -112, %sp
110 $re = qr/.*save.*%sp, -(([0-9]{2}|[3-9])[0-9]{2}), %sp/o;
111 } else {
112 print("wrong or unknown architecture \"$arch\"\n");
113 exit
118 # main()
120 my ($func, $file, $lastslash);
122 while (my $line = <STDIN>) {
123 if ($line =~ m/$funcre/) {
124 $func = $1;
126 elsif ($line =~ m/(.*):\s*file format/) {
127 $file = $1;
128 $file =~ s/\.ko//;
129 $lastslash = rindex($file, "/");
130 if ($lastslash != -1) {
131 $file = substr($file, $lastslash + 1);
134 elsif ($line =~ m/$re/) {
135 my $size = $1;
136 $size = hex($size) if ($size =~ /^0x/);
138 if ($size > 0xf0000000) {
139 $size = - $size;
140 $size += 0x80000000;
141 $size += 0x80000000;
143 next if ($size > 0x10000000);
145 next if $line !~ m/^($xs*)/;
146 my $addr = $1;
147 $addr =~ s/ /0/g;
148 $addr = "0x$addr";
150 my $intro = "$addr $func [$file]:";
151 my $padlen = 56 - length($intro);
152 while ($padlen > 0) {
153 $intro .= ' ';
154 $padlen -= 8;
156 next if ($size < 100);
157 push @stack, "$intro$size\n";
159 elsif (defined $dre && $line =~ m/$dre/) {
160 my $size = "Dynamic ($1)";
162 next if $line !~ m/^($xs*)/;
163 my $addr = $1;
164 $addr =~ s/ /0/g;
165 $addr = "0x$addr";
167 my $intro = "$addr $func [$file]:";
168 my $padlen = 56 - length($intro);
169 while ($padlen > 0) {
170 $intro .= ' ';
171 $padlen -= 8;
173 push @stack, "$intro$size\n";
177 # Sort output by size (last field)
178 print sort { ($b =~ /:\t*(\d+)$/)[0] <=> ($a =~ /:\t*(\d+)$/)[0] } @stack;