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# 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; 171