1#!/usr/bin/env perl 2# SPDX-License-Identifier: GPL-2.0 3 4# Stolen from Linux kernel :) 5 6# Check the stack usage of functions 7# 8# Copyright Joern Engel <joern@lazybastard.org> 9# Inspired by Linus Torvalds 10# Original idea maybe from Keith Owens 11# s390 port and big speedup by Arnd Bergmann <arnd@bergmann-dalldorf.de> 12# Mips port by Juan Quintela <quintela@mandrakesoft.com> 13# IA64 port via Andreas Dilger 14# Arm port by Holger Schurig 15# sh64 port by Paul Mundt 16# Random bits by Matt Mackall <mpm@selenic.com> 17# M68k port by Geert Uytterhoeven and Andreas Schwab 18# blackfin port by Alex Landau 19# AArch64, PARISC ports by Kyle McMartin 20# sparc port by Martin Habets <errandir_news@mph.eclipse.co.uk> 21# ppc64le port by Breno Leitao <leitao@debian.org> 22# 23# Usage: 24# objdump -d vmlinux | scripts/checkstack.pl [arch] 25# 26# TODO : Port to all architectures (one regex per arch) 27 28use strict; 29 30# check for arch 31# 32# $re is used for two matches: 33# $& (whole re) matches the complete objdump line with the stack growth 34# $1 (first bracket) matches the size of the stack growth 35# 36# $dre is similar, but for dynamic stack reductions: 37# $& (whole re) matches the complete objdump line with the stack growth 38# $1 (first bracket) matches the dynamic amount of the stack growth 39# 40# use anything else and feel the pain ;) 41my (@stack, $re, $dre, $x, $xs, $funcre); 42{ 43 my $arch = shift; 44 if ($arch eq "") { 45 $arch = `uname -m`; 46 chomp($arch); 47 } 48 49 $x = "[0-9a-f]"; # hex character 50 $xs = "[0-9a-f ]"; # hex character or space 51 $funcre = qr/^$x* <(.*)>:$/; 52 if ($arch eq 'aarch64') { 53 #ffffffc0006325cc: a9bb7bfd stp x29, x30, [sp, #-80]! 54 #a110: d11643ff sub sp, sp, #0x590 55 $re = qr/^.*stp.*sp, \#-([0-9]{1,8})\]\!/o; 56 $dre = qr/^.*sub.*sp, sp, #(0x$x{1,8})/o; 57 } elsif ($arch eq 'arm') { 58 #c0008ffc: e24dd064 sub sp, sp, #100 ; 0x64 59 $re = qr/.*sub.*sp, sp, #(([0-9]{2}|[3-9])[0-9]{2})/o; 60 } elsif ($arch =~ /^x86(_64)?$/ || $arch =~ /^i[3456]86$/) { 61 #c0105234: 81 ec ac 05 00 00 sub $0x5ac,%esp 62 # or 63 # 2f60: 48 81 ec e8 05 00 00 sub $0x5e8,%rsp 64 $re = qr/^.*[as][du][db] \$(0x$x{1,8}),\%(e|r)sp$/o; 65 $dre = qr/^.*[as][du][db] (%.*),\%(e|r)sp$/o; 66 } elsif ($arch eq 'blackfin') { 67 # 52: 00 e8 03 00 LINK 0xc; 68 $re = qr/.*[[:space:]]LINK[[:space:]]*(0x$x{1,8})/o; 69 } elsif ($arch eq 'ia64') { 70 #e0000000044011fc: 01 0f fc 8c adds r12=-384,r12 71 $re = qr/.*adds.*r12=-(([0-9]{2}|[3-9])[0-9]{2}),r12/o; 72 } elsif ($arch eq 'm68k') { 73 # 2b6c: 4e56 fb70 linkw %fp,#-1168 74 # 1df770: defc ffe4 addaw #-28,%sp 75 $re = qr/.*(?:linkw %fp,|addaw )#-([0-9]{1,4})(?:,%sp)?$/o; 76 } elsif ($arch eq 'mips64') { 77 #8800402c: 67bdfff0 daddiu sp,sp,-16 78 $re = qr/.*daddiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o; 79 } elsif ($arch eq 'mips') { 80 #88003254: 27bdffe0 addiu sp,sp,-32 81 $re = qr/.*addiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o; 82 } elsif ($arch eq 'nios2') { 83 #25a8: defffb04 addi sp,sp,-20 84 $re = qr/.*addi.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o; 85 } elsif ($arch eq 'openrisc') { 86 # c000043c: 9c 21 fe f0 l.addi r1,r1,-272 87 $re = qr/.*l\.addi.*r1,r1,-(([0-9]{2}|[3-9])[0-9]{2})/o; 88 } elsif ($arch eq 'parisc' || $arch eq 'parisc64') { 89 $re = qr/.*ldo ($x{1,8})\(sp\),sp/o; 90 } elsif ($arch eq 'powerpc' || $arch =~ /^ppc(64)?(le)?$/ ) { 91 # powerpc : 94 21 ff 30 stwu r1,-208(r1) 92 # ppc64(le) : 81 ff 21 f8 stdu r1,-128(r1) 93 $re = qr/.*st[dw]u.*r1,-($x{1,8})\(r1\)/o; 94 } elsif ($arch =~ /^s390x?$/) { 95 # 11160: a7 fb ff 60 aghi %r15,-160 96 # or 97 # 100092: e3 f0 ff c8 ff 71 lay %r15,-56(%r15) 98 $re = qr/.*(?:lay|ag?hi).*\%r15,-(([0-9]{2}|[3-9])[0-9]{2}) 99 (?:\(\%r15\))?$/ox; 100 } elsif ($arch =~ /^sh64$/) { 101 #XXX: we only check for the immediate case presently, 102 # though we will want to check for the movi/sub 103 # pair for larger users. -- PFM. 104 #a00048e0: d4fc40f0 addi.l r15,-240,r15 105 $re = qr/.*addi\.l.*r15,-(([0-9]{2}|[3-9])[0-9]{2}),r15/o; 106 } elsif ($arch eq 'sparc' || $arch eq 'sparc64') { 107 # f0019d10: 9d e3 bf 90 save %sp, -112, %sp 108 $re = qr/.*save.*%sp, -(([0-9]{2}|[3-9])[0-9]{2}), %sp/o; 109 } else { 110 print("wrong or unknown architecture \"$arch\"\n"); 111 exit 112 } 113} 114 115# 116# main() 117# 118my ($func, $file, $lastslash); 119 120while (my $line = <STDIN>) { 121 if ($line =~ m/$funcre/) { 122 $func = $1; 123 } 124 elsif ($line =~ m/(.*):\s*file format/) { 125 $file = $1; 126 $file =~ s/\.ko//; 127 $lastslash = rindex($file, "/"); 128 if ($lastslash != -1) { 129 $file = substr($file, $lastslash + 1); 130 } 131 } 132 elsif ($line =~ m/$re/) { 133 my $size = $1; 134 $size = hex($size) if ($size =~ /^0x/); 135 136 if ($size > 0xf0000000) { 137 $size = - $size; 138 $size += 0x80000000; 139 $size += 0x80000000; 140 } 141 next if ($size > 0x10000000); 142 143 next if $line !~ m/^($xs*)/; 144 my $addr = $1; 145 $addr =~ s/ /0/g; 146 $addr = "0x$addr"; 147 148 # bbox: was: my $intro = "$addr $func [$file]:"; 149 my $intro = "$func [$file]:"; 150 my $padlen = 56 - length($intro); 151 while ($padlen > 0) { 152 $intro .= ' '; 153 $padlen -= 8; 154 } 155 next if ($size < 100); 156 push @stack, "$intro$size\n"; 157 } 158 elsif (defined $dre && $line =~ m/$dre/) { 159 my $size = "Dynamic ($1)"; 160 161 next if $line !~ m/^($xs*)/; 162 my $addr = $1; 163 $addr =~ s/ /0/g; 164 $addr = "0x$addr"; 165 166 #bbox: was: my $intro = "$addr $func [$file]:"; 167 my $intro = "$func [$file]:"; 168 my $padlen = 56 - length($intro); 169 while ($padlen > 0) { 170 $intro .= ' '; 171 $padlen -= 8; 172 } 173 push @stack, "$intro$size\n"; 174 } 175} 176 177sub bysize($) { 178 my ($asize, $bsize); 179 ($asize = $a) =~ s/.*: *(.*)$/$1/; 180 ($bsize = $b) =~ s/.*: *(.*)$/$1/; 181 $bsize <=> $asize 182} 183 184# Sort output by size (last field) 185print sort { ($b =~ /:\t*(\d+)$/)[0] <=> ($a =~ /:\t*(\d+)$/)[0] } @stack; 186