Loading...
1#!/usr/bin/perl
2
3# Check the stack usage of functions
4#
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# AVR32 port by Haavard Skinnemoen (Atmel)
16# PARISC port by Kyle McMartin <kyle@parisc-linux.org>
17# sparc port by Martin Habets <errandir_news@mph.eclipse.co.uk>
18#
19# Usage:
20# objdump -d vmlinux | scripts/checkstack.pl [arch]
21#
22# TODO : Port to all architectures (one regex per arch)
23
24use strict;
25
26# check for arch
27#
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
31#
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
35#
36# use anything else and feel the pain ;)
37my (@stack, $re, $dre, $x, $xs, $funcre);
38{
39 my $arch = shift;
40 if ($arch eq "") {
41 $arch = `uname -m`;
42 chomp($arch);
43 }
44
45 $x = "[0-9a-f]"; # hex character
46 $xs = "[0-9a-f ]"; # hex character or space
47 $funcre = qr/^$x* <(.*)>:$/;
48 if ($arch eq 'arm') {
49 #c0008ffc: e24dd064 sub sp, sp, #100 ; 0x64
50 $re = qr/.*sub.*sp, sp, #(([0-9]{2}|[3-9])[0-9]{2})/o;
51 } elsif ($arch eq 'avr32') {
52 #8000008a: 20 1d sub sp,4
53 #80000ca8: fa cd 05 b0 sub sp,sp,1456
54 $re = qr/^.*sub.*sp.*,([0-9]{1,8})/o;
55 } elsif ($arch =~ /^i[3456]86$/) {
56 #c0105234: 81 ec ac 05 00 00 sub $0x5ac,%esp
57 $re = qr/^.*[as][du][db] \$(0x$x{1,8}),\%esp$/o;
58 $dre = qr/^.*[as][du][db] (%.*),\%esp$/o;
59 } elsif ($arch eq 'x86_64') {
60 # 2f60: 48 81 ec e8 05 00 00 sub $0x5e8,%rsp
61 $re = qr/^.*[as][du][db] \$(0x$x{1,8}),\%rsp$/o;
62 $dre = qr/^.*[as][du][db] (\%.*),\%rsp$/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 'metag') {
71 #400026fc: 40 00 00 82 ADD A0StP,A0StP,#0x8
72 $re = qr/.*ADD.*A0StP,A0StP,\#(0x$x{1,8})/o;
73 $funcre = qr/^$x* <[^\$](.*)>:$/;
74 } elsif ($arch eq 'mips64') {
75 #8800402c: 67bdfff0 daddiu sp,sp,-16
76 $re = qr/.*daddiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
77 } elsif ($arch eq 'mips') {
78 #88003254: 27bdffe0 addiu sp,sp,-32
79 $re = qr/.*addiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
80 } elsif ($arch eq 'parisc' || $arch eq 'parisc64') {
81 $re = qr/.*ldo ($x{1,8})\(sp\),sp/o;
82 } elsif ($arch eq 'ppc') {
83 #c00029f4: 94 21 ff 30 stwu r1,-208(r1)
84 $re = qr/.*stwu.*r1,-($x{1,8})\(r1\)/o;
85 } elsif ($arch eq 'ppc64') {
86 #XXX
87 $re = qr/.*stdu.*r1,-($x{1,8})\(r1\)/o;
88 } elsif ($arch eq 'powerpc') {
89 $re = qr/.*st[dw]u.*r1,-($x{1,8})\(r1\)/o;
90 } elsif ($arch =~ /^s390x?$/) {
91 # 11160: a7 fb ff 60 aghi %r15,-160
92 # or
93 # 100092: e3 f0 ff c8 ff 71 lay %r15,-56(%r15)
94 $re = qr/.*(?:lay|ag?hi).*\%r15,-(([0-9]{2}|[3-9])[0-9]{2})
95 (?:\(\%r15\))?$/ox;
96 } elsif ($arch =~ /^sh64$/) {
97 #XXX: we only check for the immediate case presently,
98 # though we will want to check for the movi/sub
99 # pair for larger users. -- PFM.
100 #a00048e0: d4fc40f0 addi.l r15,-240,r15
101 $re = qr/.*addi\.l.*r15,-(([0-9]{2}|[3-9])[0-9]{2}),r15/o;
102 } elsif ($arch =~ /^blackfin$/) {
103 # 0: 00 e8 38 01 LINK 0x4e0;
104 $re = qr/.*[[:space:]]LINK[[:space:]]*(0x$x{1,8})/o;
105 } elsif ($arch eq 'sparc' || $arch eq 'sparc64') {
106 # f0019d10: 9d e3 bf 90 save %sp, -112, %sp
107 $re = qr/.*save.*%sp, -(([0-9]{2}|[3-9])[0-9]{2}), %sp/o;
108 } else {
109 print("wrong or unknown architecture \"$arch\"\n");
110 exit
111 }
112}
113
114#
115# main()
116#
117my ($func, $file, $lastslash);
118
119while (my $line = <STDIN>) {
120 if ($line =~ m/$funcre/) {
121 $func = $1;
122 }
123 elsif ($line =~ m/(.*):\s*file format/) {
124 $file = $1;
125 $file =~ s/\.ko//;
126 $lastslash = rindex($file, "/");
127 if ($lastslash != -1) {
128 $file = substr($file, $lastslash + 1);
129 }
130 }
131 elsif ($line =~ m/$re/) {
132 my $size = $1;
133 $size = hex($size) if ($size =~ /^0x/);
134
135 if ($size > 0xf0000000) {
136 $size = - $size;
137 $size += 0x80000000;
138 $size += 0x80000000;
139 }
140 next if ($size > 0x10000000);
141
142 next if $line !~ m/^($xs*)/;
143 my $addr = $1;
144 $addr =~ s/ /0/g;
145 $addr = "0x$addr";
146
147 my $intro = "$addr $func [$file]:";
148 my $padlen = 56 - length($intro);
149 while ($padlen > 0) {
150 $intro .= ' ';
151 $padlen -= 8;
152 }
153 next if ($size < 100);
154 push @stack, "$intro$size\n";
155 }
156 elsif (defined $dre && $line =~ m/$dre/) {
157 my $size = "Dynamic ($1)";
158
159 next if $line !~ m/^($xs*)/;
160 my $addr = $1;
161 $addr =~ s/ /0/g;
162 $addr = "0x$addr";
163
164 my $intro = "$addr $func [$file]:";
165 my $padlen = 56 - length($intro);
166 while ($padlen > 0) {
167 $intro .= ' ';
168 $padlen -= 8;
169 }
170 push @stack, "$intro$size\n";
171 }
172}
173
174# Sort output by size (last field)
175print sort { ($b =~ /:\t*(\d+)$/)[0] <=> ($a =~ /:\t*(\d+)$/)[0] } @stack;
176
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 <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>
19# riscv port by Wadim Mueller <wafgo01@gmail.com>
20#
21# Usage:
22# objdump -d vmlinux | scripts/checkstack.pl [arch]
23#
24# TODO : Port to all architectures (one regex per arch)
25
26use strict;
27
28# check for arch
29#
30# $re is used for two matches:
31# $& (whole re) matches the complete objdump line with the stack growth
32# $1 (first bracket) matches the size of the stack growth
33#
34# $dre is similar, but for dynamic stack redutions:
35# $& (whole re) matches the complete objdump line with the stack growth
36# $1 (first bracket) matches the dynamic amount of the stack growth
37#
38# $sub: subroutine for special handling to check stack usage.
39#
40# use anything else and feel the pain ;)
41my (@stack, $re, $dre, $sub, $x, $xs, $funcre, $min_stack);
42{
43 my $arch = shift;
44 if ($arch eq "") {
45 $arch = `uname -m`;
46 chomp($arch);
47 }
48
49 $min_stack = shift;
50 if ($min_stack eq "" || $min_stack !~ /^\d+$/) {
51 $min_stack = 100;
52 }
53
54 $x = "[0-9a-f]"; # hex character
55 $xs = "[0-9a-f ]"; # hex character or space
56 $funcre = qr/^$x* <(.*)>:$/;
57 if ($arch =~ '^(aarch|arm)64$') {
58 #ffffffc0006325cc: a9bb7bfd stp x29, x30, [sp, #-80]!
59 #a110: d11643ff sub sp, sp, #0x590
60 $re = qr/^.*stp.*sp, \#-([0-9]{1,8})\]\!/o;
61 $dre = qr/^.*sub.*sp, sp, #(0x$x{1,8})/o;
62 } elsif ($arch eq 'arm') {
63 #c0008ffc: e24dd064 sub sp, sp, #100 ; 0x64
64 $re = qr/.*sub.*sp, sp, #([0-9]{1,4})/o;
65 $sub = \&arm_push_handling;
66 } elsif ($arch =~ /^x86(_64)?$/ || $arch =~ /^i[3456]86$/) {
67 #c0105234: 81 ec ac 05 00 00 sub $0x5ac,%esp
68 # or
69 # 2f60: 48 81 ec e8 05 00 00 sub $0x5e8,%rsp
70 $re = qr/^.*[as][du][db] \$(0x$x{1,8}),\%(e|r)sp$/o;
71 $dre = qr/^.*[as][du][db] (%.*),\%(e|r)sp$/o;
72 } elsif ($arch eq 'ia64') {
73 #e0000000044011fc: 01 0f fc 8c adds r12=-384,r12
74 $re = qr/.*adds.*r12=-(([0-9]{2}|[3-9])[0-9]{2}),r12/o;
75 } elsif ($arch eq 'm68k') {
76 # 2b6c: 4e56 fb70 linkw %fp,#-1168
77 # 1df770: defc ffe4 addaw #-28,%sp
78 $re = qr/.*(?:linkw %fp,|addaw )#-([0-9]{1,4})(?:,%sp)?$/o;
79 } elsif ($arch eq 'mips64') {
80 #8800402c: 67bdfff0 daddiu sp,sp,-16
81 $re = qr/.*daddiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
82 } elsif ($arch eq 'mips') {
83 #88003254: 27bdffe0 addiu sp,sp,-32
84 $re = qr/.*addiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
85 } elsif ($arch eq 'nios2') {
86 #25a8: defffb04 addi sp,sp,-20
87 $re = qr/.*addi.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
88 } elsif ($arch eq 'openrisc') {
89 # c000043c: 9c 21 fe f0 l.addi r1,r1,-272
90 $re = qr/.*l\.addi.*r1,r1,-(([0-9]{2}|[3-9])[0-9]{2})/o;
91 } elsif ($arch eq 'parisc' || $arch eq 'parisc64') {
92 $re = qr/.*ldo ($x{1,8})\(sp\),sp/o;
93 } elsif ($arch eq 'powerpc' || $arch =~ /^ppc(64)?(le)?$/ ) {
94 # powerpc : 94 21 ff 30 stwu r1,-208(r1)
95 # ppc64(le) : 81 ff 21 f8 stdu r1,-128(r1)
96 $re = qr/.*st[dw]u.*r1,-($x{1,8})\(r1\)/o;
97 } elsif ($arch =~ /^s390x?$/) {
98 # 11160: a7 fb ff 60 aghi %r15,-160
99 # or
100 # 100092: e3 f0 ff c8 ff 71 lay %r15,-56(%r15)
101 $re = qr/.*(?:lay|ag?hi).*\%r15,-(([0-9]{2}|[3-9])[0-9]{2})
102 (?:\(\%r15\))?$/ox;
103 } elsif ($arch =~ /^sh64$/) {
104 #XXX: we only check for the immediate case presently,
105 # though we will want to check for the movi/sub
106 # pair for larger users. -- PFM.
107 #a00048e0: d4fc40f0 addi.l r15,-240,r15
108 $re = qr/.*addi\.l.*r15,-(([0-9]{2}|[3-9])[0-9]{2}),r15/o;
109 } elsif ($arch eq 'sparc' || $arch eq 'sparc64') {
110 # f0019d10: 9d e3 bf 90 save %sp, -112, %sp
111 $re = qr/.*save.*%sp, -(([0-9]{2}|[3-9])[0-9]{2}), %sp/o;
112 } elsif ($arch =~ /^riscv(64)?$/) {
113 #ffffffff8036e868: c2010113 addi sp,sp,-992
114 $re = qr/.*addi.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
115 } else {
116 print("wrong or unknown architecture \"$arch\"\n");
117 exit
118 }
119}
120
121#
122# To count stack usage of push {*, fp, ip, lr, pc} instruction in ARM,
123# if FRAME POINTER is enabled.
124# e.g. c01f0d48: e92ddff0 push {r4, r5, r6, r7, r8, r9, sl, fp, ip, lr, pc}
125#
126sub arm_push_handling {
127 my $regex = qr/.*push.*fp, ip, lr, pc}/o;
128 my $size = 0;
129 my $line_arg = shift;
130
131 if ($line_arg =~ m/$regex/) {
132 $size = $line_arg =~ tr/,//;
133 $size = ($size + 1) * 4;
134 }
135
136 return $size;
137}
138
139#
140# main()
141#
142my ($func, $file, $lastslash, $total_size, $addr, $intro);
143
144$total_size = 0;
145
146while (my $line = <STDIN>) {
147 if ($line =~ m/$funcre/) {
148 $func = $1;
149 next if $line !~ m/^($xs*)/;
150 if ($total_size > $min_stack) {
151 push @stack, "$intro$total_size\n";
152 }
153
154 $addr = $1;
155 $addr =~ s/ /0/g;
156 $addr = "0x$addr";
157
158 $intro = "$addr $func [$file]:";
159 my $padlen = 56 - length($intro);
160 while ($padlen > 0) {
161 $intro .= ' ';
162 $padlen -= 8;
163 }
164
165 $total_size = 0;
166 }
167 elsif ($line =~ m/(.*):\s*file format/) {
168 $file = $1;
169 $file =~ s/\.ko//;
170 $lastslash = rindex($file, "/");
171 if ($lastslash != -1) {
172 $file = substr($file, $lastslash + 1);
173 }
174 }
175 elsif ($line =~ m/$re/) {
176 my $size = $1;
177 $size = hex($size) if ($size =~ /^0x/);
178
179 if ($size > 0xf0000000) {
180 $size = - $size;
181 $size += 0x80000000;
182 $size += 0x80000000;
183 }
184 next if ($size > 0x10000000);
185
186 $total_size += $size;
187 }
188 elsif (defined $dre && $line =~ m/$dre/) {
189 my $size = $1;
190
191 $size = hex($size) if ($size =~ /^0x/);
192 $total_size += $size;
193 }
194 elsif (defined $sub) {
195 my $size = &$sub($line);
196
197 $total_size += $size;
198 }
199}
200if ($total_size > $min_stack) {
201 push @stack, "$intro$total_size\n";
202}
203
204# Sort output by size (last field)
205print sort { ($b =~ /:\t*(\d+)$/)[0] <=> ($a =~ /:\t*(\d+)$/)[0] } @stack;