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# 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 '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 'mips64') { 68 #8800402c: 67bdfff0 daddiu sp,sp,-16 69 $re = qr/.*daddiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o; 70 } elsif ($arch eq 'mips') { 71 #88003254: 27bdffe0 addiu sp,sp,-32 72 $re = qr/.*addiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o; 73 } elsif ($arch eq 'nios2') { 74 #25a8: defffb04 addi sp,sp,-20 75 $re = qr/.*addi.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o; 76 } elsif ($arch eq 'openrisc') { 77 # c000043c: 9c 21 fe f0 l.addi r1,r1,-272 78 $re = qr/.*l\.addi.*r1,r1,-(([0-9]{2}|[3-9])[0-9]{2})/o; 79 } elsif ($arch eq 'parisc' || $arch eq 'parisc64') { 80 $re = qr/.*ldo ($x{1,8})\(sp\),sp/o; 81 } elsif ($arch eq 'ppc') { 82 #c00029f4: 94 21 ff 30 stwu r1,-208(r1) 83 $re = qr/.*stwu.*r1,-($x{1,8})\(r1\)/o; 84 } elsif ($arch eq 'ppc64') { 85 #XXX 86 $re = qr/.*stdu.*r1,-($x{1,8})\(r1\)/o; 87 } elsif ($arch eq 'powerpc') { 88 $re = qr/.*st[dw]u.*r1,-($x{1,8})\(r1\)/o; 89 } elsif ($arch =~ /^s390x?$/) { 90 # 11160: a7 fb ff 60 aghi %r15,-160 91 # or 92 # 100092: e3 f0 ff c8 ff 71 lay %r15,-56(%r15) 93 $re = qr/.*(?:lay|ag?hi).*\%r15,-(([0-9]{2}|[3-9])[0-9]{2}) 94 (?:\(\%r15\))?$/ox; 95 } elsif ($arch =~ /^sh64$/) { 96 #XXX: we only check for the immediate case presently, 97 # though we will want to check for the movi/sub 98 # pair for larger users. -- PFM. 99 #a00048e0: d4fc40f0 addi.l r15,-240,r15 100 $re = qr/.*addi\.l.*r15,-(([0-9]{2}|[3-9])[0-9]{2}),r15/o; 101 } elsif ($arch eq 'sparc' || $arch eq 'sparc64') { 102 # f0019d10: 9d e3 bf 90 save %sp, -112, %sp 103 $re = qr/.*save.*%sp, -(([0-9]{2}|[3-9])[0-9]{2}), %sp/o; 104 } else { 105 print("wrong or unknown architecture \"$arch\"\n"); 106 exit 107 } 108} 109 110# 111# main() 112# 113my ($func, $file, $lastslash); 114 115while (my $line = <STDIN>) { 116 if ($line =~ m/$funcre/) { 117 $func = $1; 118 } 119 elsif ($line =~ m/(.*):\s*file format/) { 120 $file = $1; 121 $file =~ s/\.ko//; 122 $lastslash = rindex($file, "/"); 123 if ($lastslash != -1) { 124 $file = substr($file, $lastslash + 1); 125 } 126 } 127 elsif ($line =~ m/$re/) { 128 my $size = $1; 129 $size = hex($size) if ($size =~ /^0x/); 130 131 if ($size > 0xf0000000) { 132 $size = - $size; 133 $size += 0x80000000; 134 $size += 0x80000000; 135 } 136 next if ($size > 0x10000000); 137 138 next if $line !~ m/^($xs*)/; 139 my $addr = $1; 140 $addr =~ s/ /0/g; 141 $addr = "0x$addr"; 142 143 my $intro = "$addr $func [$file]:"; 144 my $padlen = 56 - length($intro); 145 while ($padlen > 0) { 146 $intro .= ' '; 147 $padlen -= 8; 148 } 149 next if ($size < 100); 150 push @stack, "$intro$size\n"; 151 } 152 elsif (defined $dre && $line =~ m/$dre/) { 153 my $size = "Dynamic ($1)"; 154 155 next if $line !~ m/^($xs*)/; 156 my $addr = $1; 157 $addr =~ s/ /0/g; 158 $addr = "0x$addr"; 159 160 my $intro = "$addr $func [$file]:"; 161 my $padlen = 56 - length($intro); 162 while ($padlen > 0) { 163 $intro .= ' '; 164 $padlen -= 8; 165 } 166 push @stack, "$intro$size\n"; 167 } 168} 169 170# Sort output by size (last field) 171print sort { ($b =~ /:\t*(\d+)$/)[0] <=> ($a =~ /:\t*(\d+)$/)[0] } @stack; 172