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 <hskinnemoen@atmel.com> 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 24# check for arch 25# 26# $re is used for two matches: 27# $& (whole re) matches the complete objdump line with the stack growth 28# $1 (first bracket) matches the size of the stack growth 29# 30# $dre is similar, but for dynamic stack redutions: 31# $& (whole re) matches the complete objdump line with the stack growth 32# $1 (first bracket) matches the dynamic amount of the stack growth 33# 34# use anything else and feel the pain ;) 35my (@stack, $re, $dre, $x, $xs); 36{ 37 my $arch = shift; 38 if ($arch eq "") { 39 $arch = `uname -m`; 40 chomp($arch); 41 } 42 43 $x = "[0-9a-f]"; # hex character 44 $xs = "[0-9a-f ]"; # hex character or space 45 if ($arch eq 'arm') { 46 #c0008ffc: e24dd064 sub sp, sp, #100 ; 0x64 47 $re = qr/.*sub.*sp, sp, #(([0-9]{2}|[3-9])[0-9]{2})/o; 48 } elsif ($arch eq 'avr32') { 49 #8000008a: 20 1d sub sp,4 50 #80000ca8: fa cd 05 b0 sub sp,sp,1456 51 $re = qr/^.*sub.*sp.*,([0-9]{1,8})/o; 52 } elsif ($arch =~ /^i[3456]86$/) { 53 #c0105234: 81 ec ac 05 00 00 sub $0x5ac,%esp 54 $re = qr/^.*[as][du][db] \$(0x$x{1,8}),\%esp$/o; 55 $dre = qr/^.*[as][du][db] (%.*),\%esp$/o; 56 } elsif ($arch eq 'x86_64') { 57 # 2f60: 48 81 ec e8 05 00 00 sub $0x5e8,%rsp 58 $re = qr/^.*[as][du][db] \$(0x$x{1,8}),\%rsp$/o; 59 $dre = qr/^.*[as][du][db] (\%.*),\%rsp$/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 'parisc' || $arch eq 'parisc64') { 74 $re = qr/.*ldo ($x{1,8})\(sp\),sp/o; 75 } elsif ($arch eq 'ppc') { 76 #c00029f4: 94 21 ff 30 stwu r1,-208(r1) 77 $re = qr/.*stwu.*r1,-($x{1,8})\(r1\)/o; 78 } elsif ($arch eq 'ppc64') { 79 #XXX 80 $re = qr/.*stdu.*r1,-($x{1,8})\(r1\)/o; 81 } elsif ($arch eq 'powerpc') { 82 $re = qr/.*st[dw]u.*r1,-($x{1,8})\(r1\)/o; 83 } elsif ($arch =~ /^s390x?$/) { 84 # 11160: a7 fb ff 60 aghi %r15,-160 85 # or 86 # 100092: e3 f0 ff c8 ff 71 lay %r15,-56(%r15) 87 $re = qr/.*(?:lay|ag?hi).*\%r15,-(([0-9]{2}|[3-9])[0-9]{2}) 88 (?:\(\%r15\))?$/ox; 89 } elsif ($arch =~ /^sh64$/) { 90 #XXX: we only check for the immediate case presently, 91 # though we will want to check for the movi/sub 92 # pair for larger users. -- PFM. 93 #a00048e0: d4fc40f0 addi.l r15,-240,r15 94 $re = qr/.*addi\.l.*r15,-(([0-9]{2}|[3-9])[0-9]{2}),r15/o; 95 } elsif ($arch =~ /^blackfin$/) { 96 # 0: 00 e8 38 01 LINK 0x4e0; 97 $re = qr/.*[[:space:]]LINK[[:space:]]*(0x$x{1,8})/o; 98 } elsif ($arch eq 'sparc' || $arch eq 'sparc64') { 99 # f0019d10: 9d e3 bf 90 save %sp, -112, %sp 100 $re = qr/.*save.*%sp, -(([0-9]{2}|[3-9])[0-9]{2}), %sp/o; 101 } else { 102 print("wrong or unknown architecture \"$arch\"\n"); 103 exit 104 } 105} 106 107sub bysize($) { 108 my ($asize, $bsize); 109 ($asize = $a) =~ s/.*: *(.*)$/$1/; 110 ($bsize = $b) =~ s/.*: *(.*)$/$1/; 111 $bsize <=> $asize 112} 113 114# 115# main() 116# 117my $funcre = qr/^$x* <(.*)>:$/; 118my $func; 119my $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 176print sort bysize @stack; 177