projects/linux·blob v5.6-rc6 · refs

170 lines · 5.3 KiB

1#!/usr/bin/env perl
2# SPDX-License-Identifier: GPL-2.0
3
4# Check the stack usage of functions
5#
6# Copyright Joern Engel <[email protected]>
7# Inspired by Linus Torvalds
8# Original idea maybe from Keith Owens
9# s390 port and big speedup by Arnd Bergmann <[email protected]>
10# Mips port by Juan Quintela <[email protected]>
11# IA64 port via Andreas Dilger
12# Arm port by Holger Schurig
13# sh64 port by Paul Mundt
14# Random bits by Matt Mackall <[email protected]>
15# M68k port by Geert Uytterhoeven and Andreas Schwab
16# AArch64, PARISC ports by Kyle McMartin
17# sparc port by Martin Habets <[email protected]>
18# ppc64le port by Breno Leitao <[email protected]>
19#
20# Usage:
21# objdump -d vmlinux | scripts/checkstack.pl [arch]
22#
23# TODO : Port to all architectures (one regex per arch)
24
25use strict;
26
27# check for arch
28#
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
32#
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
36#
37# use anything else and feel the pain ;)
38my (@stack, $re, $dre, $x, $xs, $funcre);
39{
40 my $arch = shift;
41 if ($arch eq "") {
42 $arch = `uname -m`;
43 chomp($arch);
44 }
45
46 $x = "[0-9a-f]"; # hex character
47 $xs = "[0-9a-f ]"; # hex character or space
48 $funcre = qr/^$x* <(.*)>:$/;
49 if ($arch =~ '^(aarch|arm)64$') {
50 #ffffffc0006325cc: a9bb7bfd stp x29, x30, [sp, #-80]!
51 #a110: d11643ff sub sp, sp, #0x590
52 $re = qr/^.*stp.*sp, \#-([0-9]{1,8})\]\!/o;
53 $dre = qr/^.*sub.*sp, sp, #(0x$x{1,8})/o;
54 } elsif ($arch eq 'arm') {
55 #c0008ffc: e24dd064 sub sp, sp, #100 ; 0x64
56 $re = qr/.*sub.*sp, sp, #(([0-9]{2}|[3-9])[0-9]{2})/o;
57 } elsif ($arch =~ /^x86(_64)?$/ || $arch =~ /^i[3456]86$/) {
58 #c0105234: 81 ec ac 05 00 00 sub $0x5ac,%esp
59 # or
60 # 2f60: 48 81 ec e8 05 00 00 sub $0x5e8,%rsp
61 $re = qr/^.*[as][du][db] \$(0x$x{1,8}),\%(e|r)sp$/o;
62 $dre = qr/^.*[as][du][db] (%.*),\%(e|r)sp$/o;
63 } elsif ($arch eq 'ia64') {
64 #e0000000044011fc: 01 0f fc 8c adds r12=-384,r12
65 $re = qr/.*adds.*r12=-(([0-9]{2}|[3-9])[0-9]{2}),r12/o;
66 } elsif ($arch eq 'm68k') {
67 # 2b6c: 4e56 fb70 linkw %fp,#-1168
68 # 1df770: defc ffe4 addaw #-28,%sp
69 $re = qr/.*(?:linkw %fp,|addaw )#-([0-9]{1,4})(?:,%sp)?$/o;
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 'powerpc' || $arch =~ /^ppc(64)?(le)?$/ ) {
85 # powerpc : 94 21 ff 30 stwu r1,-208(r1)
86 # ppc64(le) : 81 ff 21 f8 stdu r1,-128(r1)
87 $re = qr/.*st[dw]u.*r1,-($x{1,8})\(r1\)/o;
88 } elsif ($arch =~ /^s390x?$/) {
89 # 11160: a7 fb ff 60 aghi %r15,-160
90 # or
91 # 100092: e3 f0 ff c8 ff 71 lay %r15,-56(%r15)
92 $re = qr/.*(?:lay|ag?hi).*\%r15,-(([0-9]{2}|[3-9])[0-9]{2})
93 (?:\(\%r15\))?$/ox;
94 } elsif ($arch =~ /^sh64$/) {
95 #XXX: we only check for the immediate case presently,
96 # though we will want to check for the movi/sub
97 # pair for larger users. -- PFM.
98 #a00048e0: d4fc40f0 addi.l r15,-240,r15
99 $re = qr/.*addi\.l.*r15,-(([0-9]{2}|[3-9])[0-9]{2}),r15/o;
100 } elsif ($arch eq 'sparc' || $arch eq 'sparc64') {
101 # f0019d10: 9d e3 bf 90 save %sp, -112, %sp
102 $re = qr/.*save.*%sp, -(([0-9]{2}|[3-9])[0-9]{2}), %sp/o;
103 } else {
104 print("wrong or unknown architecture \"$arch\"\n");
105 exit
106 }
107}
108
109#
110# main()
111#
112my ($func, $file, $lastslash);
113
114while (my $line = <STDIN>) {
115 if ($line =~ m/$funcre/) {
116 $func = $1;
117 }
118 elsif ($line =~ m/(.*):\s*file format/) {
119 $file = $1;
120 $file =~ s/\.ko//;
121 $lastslash = rindex($file, "/");
122 if ($lastslash != -1) {
123 $file = substr($file, $lastslash + 1);
124 }
125 }
126 elsif ($line =~ m/$re/) {
127 my $size = $1;
128 $size = hex($size) if ($size =~ /^0x/);
129
130 if ($size > 0xf0000000) {
131 $size = - $size;
132 $size += 0x80000000;
133 $size += 0x80000000;
134 }
135 next if ($size > 0x10000000);
136
137 next if $line !~ m/^($xs*)/;
138 my $addr = $1;
139 $addr =~ s/ /0/g;
140 $addr = "0x$addr";
141
142 my $intro = "$addr $func [$file]:";
143 my $padlen = 56 - length($intro);
144 while ($padlen > 0) {
145 $intro .= ' ';
146 $padlen -= 8;
147 }
148 next if ($size < 100);
149 push @stack, "$intro$size\n";
150 }
151 elsif (defined $dre && $line =~ m/$dre/) {
152 my $size = "Dynamic ($1)";
153
154 next if $line !~ m/^($xs*)/;
155 my $addr = $1;
156 $addr =~ s/ /0/g;
157 $addr = "0x$addr";
158
159 my $intro = "$addr $func [$file]:";
160 my $padlen = 56 - length($intro);
161 while ($padlen > 0) {
162 $intro .= ' ';
163 $padlen -= 8;
164 }
165 push @stack, "$intro$size\n";
166 }
167}
168
169# Sort output by size (last field)
170print sort { ($b =~ /:\t*(\d+)$/)[0] <=> ($a =~ /:\t*(\d+)$/)[0] } @stack;