1#!/usr/bin/env 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# AArch64, PARISC ports by Kyle McMartin 16# sparc port by Martin Habets <errandir_news@mph.eclipse.co.uk> 17# 18# Usage: 19# objdump -d vmlinux | scripts/checkstack.pl [arch] 20# 21# TODO : Port to all architectures (one regex per arch) 22 23use strict; 24 25# check for arch 26# 27# $re is used for two matches: 28# $& (whole re) matches the complete objdump line with the stack growth 29# $1 (first bracket) matches the size of the stack growth 30# 31# $dre is similar, but for dynamic stack redutions: 32# $& (whole re) matches the complete objdump line with the stack growth 33# $1 (first bracket) matches the dynamic amount of the stack growth 34# 35# use anything else and feel the pain ;) 36my (@stack, $re, $dre, $x, $xs, $funcre); 37{ 38 my $arch = shift; 39 if ($arch eq "") { 40 $arch = `uname -m`; 41 chomp($arch); 42 } 43 44 $x = "[0-9a-f]"; # hex character 45 $xs = "[0-9a-f ]"; # hex character or space 46 $funcre = qr/^$x* <(.*)>:$/; 47 if ($arch eq 'aarch64') { 48 #ffffffc0006325cc: a9bb7bfd stp x29, x30, [sp,#-80]! 49 $re = qr/^.*stp.*sp,\#-([0-9]{1,8})\]\!/o; 50 } elsif ($arch eq 'arm') { 51 #c0008ffc: e24dd064 sub sp, sp, #100 ; 0x64 52 $re = qr/.*sub.*sp, sp, #(([0-9]{2}|[3-9])[0-9]{2})/o; 53 } elsif ($arch =~ /^x86(_64)?$/ || $arch =~ /^i[3456]86$/) { 54 #c0105234: 81 ec ac 05 00 00 sub $0x5ac,%esp 55 # or 56 # 2f60: 48 81 ec e8 05 00 00 sub $0x5e8,%rsp 57 $re = qr/^.*[as][du][db] \$(0x$x{1,8}),\%(e|r)sp$/o; 58 $dre = qr/^.*[as][du][db] (%.*),\%(e|r)sp$/o; 59 } elsif ($arch eq 'ia64') { 60 #e0000000044011fc: 01 0f fc 8c adds r12=-384,r12 61 $re = qr/.*adds.*r12=-(([0-9]{2}|[3-9])[0-9]{2}),r12/o; 62 } elsif ($arch eq 'm68k') { 63 # 2b6c: 4e56 fb70 linkw %fp,#-1168 64 # 1df770: defc ffe4 addaw #-28,%sp 65 $re = qr/.*(?:linkw %fp,|addaw )#-([0-9]{1,4})(?:,%sp)?$/o; 66 } elsif ($arch eq 'metag') { 67 #400026fc: 40 00 00 82 ADD A0StP,A0StP,#0x8 68 $re = qr/.*ADD.*A0StP,A0StP,\#(0x$x{1,8})/o; 69 $funcre = qr/^$x* <[^\$](.*)>:$/; 70 } elsif ($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 'ppc') { 85 #c00029f4: 94 21 ff 30 stwu r1,-208(r1) 86 $re = qr/.*stwu.*r1,-($x{1,8})\(r1\)/o; 87 } elsif ($arch eq 'ppc64') { 88 #XXX 89 $re = qr/.*stdu.*r1,-($x{1,8})\(r1\)/o; 90 } elsif ($arch eq 'powerpc') { 91 $re = qr/.*st[dw]u.*r1,-($x{1,8})\(r1\)/o; 92 } elsif ($arch =~ /^s390x?$/) { 93 # 11160: a7 fb ff 60 aghi %r15,-160 94 # or 95 # 100092: e3 f0 ff c8 ff 71 lay %r15,-56(%r15) 96 $re = qr/.*(?:lay|ag?hi).*\%r15,-(([0-9]{2}|[3-9])[0-9]{2}) 97 (?:\(\%r15\))?$/ox; 98 } elsif ($arch =~ /^sh64$/) { 99 #XXX: we only check for the immediate case presently, 100 # though we will want to check for the movi/sub 101 # pair for larger users. -- PFM. 102 #a00048e0: d4fc40f0 addi.l r15,-240,r15 103 $re = qr/.*addi\.l.*r15,-(([0-9]{2}|[3-9])[0-9]{2}),r15/o; 104 } elsif ($arch =~ /^blackfin$/) { 105 # 0: 00 e8 38 01 LINK 0x4e0; 106 $re = qr/.*[[:space:]]LINK[[:space:]]*(0x$x{1,8})/o; 107 } elsif ($arch eq 'sparc' || $arch eq 'sparc64') { 108 # f0019d10: 9d e3 bf 90 save %sp, -112, %sp 109 $re = qr/.*save.*%sp, -(([0-9]{2}|[3-9])[0-9]{2}), %sp/o; 110 } else { 111 print("wrong or unknown architecture \"$arch\"\n"); 112 exit 113 } 114} 115 116# 117# main() 118# 119my ($func, $file, $lastslash); 120 121while (my $line = <STDIN>) { 122 if ($line =~ m/$funcre/) { 123 $func = $1; 124 } 125 elsif ($line =~ m/(.*):\s*file format/) { 126 $file = $1; 127 $file =~ s/\.ko//; 128 $lastslash = rindex($file, "/"); 129 if ($lastslash != -1) { 130 $file = substr($file, $lastslash + 1); 131 } 132 } 133 elsif ($line =~ m/$re/) { 134 my $size = $1; 135 $size = hex($size) if ($size =~ /^0x/); 136 137 if ($size > 0xf0000000) { 138 $size = - $size; 139 $size += 0x80000000; 140 $size += 0x80000000; 141 } 142 next if ($size > 0x10000000); 143 144 next if $line !~ m/^($xs*)/; 145 my $addr = $1; 146 $addr =~ s/ /0/g; 147 $addr = "0x$addr"; 148 149 my $intro = "$addr $func [$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 my $intro = "$addr $func [$file]:"; 167 my $padlen = 56 - length($intro); 168 while ($padlen > 0) { 169 $intro .= ' '; 170 $padlen -= 8; 171 } 172 push @stack, "$intro$size\n"; 173 } 174} 175 176# Sort output by size (last field) 177print sort { ($b =~ /:\t*(\d+)$/)[0] <=> ($a =~ /:\t*(\d+)$/)[0] } @stack; 178