projects/linux·blob v5.15-rc6 · refs

201 lines · 5.9 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# $sub: subroutine for special handling to check stack usage.
38#
39# use anything else and feel the pain ;)
40my (@stack, $re, $dre, $sub, $x, $xs, $funcre, $min_stack);
41{
42 my $arch = shift;
43 if ($arch eq "") {
44 $arch = `uname -m`;
45 chomp($arch);
46 }
47
48 $min_stack = shift;
49 if ($min_stack eq "" || $min_stack !~ /^\d+$/) {
50 $min_stack = 100;
51 }
52
53 $x = "[0-9a-f]"; # hex character
54 $xs = "[0-9a-f ]"; # hex character or space
55 $funcre = qr/^$x* <(.*)>:$/;
56 if ($arch =~ '^(aarch|arm)64$') {
57 #ffffffc0006325cc: a9bb7bfd stp x29, x30, [sp, #-80]!
58 #a110: d11643ff sub sp, sp, #0x590
59 $re = qr/^.*stp.*sp, \#-([0-9]{1,8})\]\!/o;
60 $dre = qr/^.*sub.*sp, sp, #(0x$x{1,8})/o;
61 } elsif ($arch eq 'arm') {
62 #c0008ffc: e24dd064 sub sp, sp, #100 ; 0x64
63 $re = qr/.*sub.*sp, sp, #([0-9]{1,4})/o;
64 $sub = \&arm_push_handling;
65 } elsif ($arch =~ /^x86(_64)?$/ || $arch =~ /^i[3456]86$/) {
66 #c0105234: 81 ec ac 05 00 00 sub $0x5ac,%esp
67 # or
68 # 2f60: 48 81 ec e8 05 00 00 sub $0x5e8,%rsp
69 $re = qr/^.*[as][du][db] \$(0x$x{1,8}),\%(e|r)sp$/o;
70 $dre = qr/^.*[as][du][db] (%.*),\%(e|r)sp$/o;
71 } elsif ($arch eq 'ia64') {
72 #e0000000044011fc: 01 0f fc 8c adds r12=-384,r12
73 $re = qr/.*adds.*r12=-(([0-9]{2}|[3-9])[0-9]{2}),r12/o;
74 } elsif ($arch eq 'm68k') {
75 # 2b6c: 4e56 fb70 linkw %fp,#-1168
76 # 1df770: defc ffe4 addaw #-28,%sp
77 $re = qr/.*(?:linkw %fp,|addaw )#-([0-9]{1,4})(?:,%sp)?$/o;
78 } elsif ($arch eq 'mips64') {
79 #8800402c: 67bdfff0 daddiu sp,sp,-16
80 $re = qr/.*daddiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
81 } elsif ($arch eq 'mips') {
82 #88003254: 27bdffe0 addiu sp,sp,-32
83 $re = qr/.*addiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
84 } elsif ($arch eq 'nios2') {
85 #25a8: defffb04 addi sp,sp,-20
86 $re = qr/.*addi.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
87 } elsif ($arch eq 'openrisc') {
88 # c000043c: 9c 21 fe f0 l.addi r1,r1,-272
89 $re = qr/.*l\.addi.*r1,r1,-(([0-9]{2}|[3-9])[0-9]{2})/o;
90 } elsif ($arch eq 'parisc' || $arch eq 'parisc64') {
91 $re = qr/.*ldo ($x{1,8})\(sp\),sp/o;
92 } elsif ($arch eq 'powerpc' || $arch =~ /^ppc(64)?(le)?$/ ) {
93 # powerpc : 94 21 ff 30 stwu r1,-208(r1)
94 # ppc64(le) : 81 ff 21 f8 stdu r1,-128(r1)
95 $re = qr/.*st[dw]u.*r1,-($x{1,8})\(r1\)/o;
96 } elsif ($arch =~ /^s390x?$/) {
97 # 11160: a7 fb ff 60 aghi %r15,-160
98 # or
99 # 100092: e3 f0 ff c8 ff 71 lay %r15,-56(%r15)
100 $re = qr/.*(?:lay|ag?hi).*\%r15,-(([0-9]{2}|[3-9])[0-9]{2})
101 (?:\(\%r15\))?$/ox;
102 } elsif ($arch =~ /^sh64$/) {
103 #XXX: we only check for the immediate case presently,
104 # though we will want to check for the movi/sub
105 # pair for larger users. -- PFM.
106 #a00048e0: d4fc40f0 addi.l r15,-240,r15
107 $re = qr/.*addi\.l.*r15,-(([0-9]{2}|[3-9])[0-9]{2}),r15/o;
108 } elsif ($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
114 }
115}
116
117#
118# To count stack usage of push {*, fp, ip, lr, pc} instruction in ARM,
119# if FRAME POINTER is enabled.
120# e.g. c01f0d48: e92ddff0 push {r4, r5, r6, r7, r8, r9, sl, fp, ip, lr, pc}
121#
122sub arm_push_handling {
123 my $regex = qr/.*push.*fp, ip, lr, pc}/o;
124 my $size = 0;
125 my $line_arg = shift;
126
127 if ($line_arg =~ m/$regex/) {
128 $size = $line_arg =~ tr/,//;
129 $size = ($size + 1) * 4;
130 }
131
132 return $size;
133}
134
135#
136# main()
137#
138my ($func, $file, $lastslash, $total_size, $addr, $intro);
139
140$total_size = 0;
141
142while (my $line = <STDIN>) {
143 if ($line =~ m/$funcre/) {
144 $func = $1;
145 next if $line !~ m/^($xs*)/;
146 if ($total_size > $min_stack) {
147 push @stack, "$intro$total_size\n";
148 }
149
150 $addr = $1;
151 $addr =~ s/ /0/g;
152 $addr = "0x$addr";
153
154 $intro = "$addr $func [$file]:";
155 my $padlen = 56 - length($intro);
156 while ($padlen > 0) {
157 $intro .= ' ';
158 $padlen -= 8;
159 }
160
161 $total_size = 0;
162 }
163 elsif ($line =~ m/(.*):\s*file format/) {
164 $file = $1;
165 $file =~ s/\.ko//;
166 $lastslash = rindex($file, "/");
167 if ($lastslash != -1) {
168 $file = substr($file, $lastslash + 1);
169 }
170 }
171 elsif ($line =~ m/$re/) {
172 my $size = $1;
173 $size = hex($size) if ($size =~ /^0x/);
174
175 if ($size > 0xf0000000) {
176 $size = - $size;
177 $size += 0x80000000;
178 $size += 0x80000000;
179 }
180 next if ($size > 0x10000000);
181
182 $total_size += $size;
183 }
184 elsif (defined $dre && $line =~ m/$dre/) {
185 my $size = $1;
186
187 $size = hex($size) if ($size =~ /^0x/);
188 $total_size += $size;
189 }
190 elsif (defined $sub) {
191 my $size = &$sub($line);
192
193 $total_size += $size;
194 }
195}
196if ($total_size > $min_stack) {
197 push @stack, "$intro$total_size\n";
198}
199
200# Sort output by size (last field)
201print sort { ($b =~ /:\t*(\d+)$/)[0] <=> ($a =~ /:\t*(\d+)$/)[0] } @stack;