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# 18# Usage: 19# objdump -d vmlinux | scripts/checkstack.pl [arch] 20# 21# TODO : Port to all architectures (one regex per arch) 22 23# check for arch 24# 25# $re is used for two matches: 26# $& (whole re) matches the complete objdump line with the stack growth 27# $1 (first bracket) matches the size of the stack growth 28# 29# $dre is similar, but for dynamic stack redutions: 30# $& (whole re) matches the complete objdump line with the stack growth 31# $1 (first bracket) matches the dynamic amount of the stack growth 32# 33# use anything else and feel the pain ;) 34my (@stack, $re, $dre, $x, $xs); 35{ 36 my $arch = shift; 37 if ($arch eq "") { 38 $arch = `uname -m`; 39 chomp($arch); 40 } 41 42 $x = "[0-9a-f]"; # hex character 43 $xs = "[0-9a-f ]"; # hex character or space 44 if ($arch eq 'arm') { 45 #c0008ffc: e24dd064 sub sp, sp, #100 ; 0x64 46 $re = qr/.*sub.*sp, sp, #(([0-9]{2}|[3-9])[0-9]{2})/o; 47 } elsif ($arch eq 'avr32') { 48 #8000008a: 20 1d sub sp,4 49 #80000ca8: fa cd 05 b0 sub sp,sp,1456 50 $re = qr/^.*sub.*sp.*,([0-9]{1,8})/o; 51 } elsif ($arch =~ /^i[3456]86$/) { 52 #c0105234: 81 ec ac 05 00 00 sub $0x5ac,%esp 53 $re = qr/^.*[as][du][db] \$(0x$x{1,8}),\%esp$/o; 54 $dre = qr/^.*[as][du][db] (%.*),\%esp$/o; 55 } elsif ($arch eq 'x86_64') { 56 # 2f60: 48 81 ec e8 05 00 00 sub $0x5e8,%rsp 57 $re = qr/^.*[as][du][db] \$(0x$x{1,8}),\%rsp$/o; 58 $dre = qr/^.*[as][du][db] (\%.*),\%rsp$/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 'mips64') { 67 #8800402c: 67bdfff0 daddiu sp,sp,-16 68 $re = qr/.*daddiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o; 69 } elsif ($arch eq 'mips') { 70 #88003254: 27bdffe0 addiu sp,sp,-32 71 $re = qr/.*addiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o; 72 } elsif ($arch eq 'parisc' || $arch eq 'parisc64') { 73 $re = qr/.*ldo ($x{1,8})\(sp\),sp/o; 74 } elsif ($arch eq 'ppc') { 75 #c00029f4: 94 21 ff 30 stwu r1,-208(r1) 76 $re = qr/.*stwu.*r1,-($x{1,8})\(r1\)/o; 77 } elsif ($arch eq 'ppc64') { 78 #XXX 79 $re = qr/.*stdu.*r1,-($x{1,8})\(r1\)/o; 80 } elsif ($arch eq 'powerpc') { 81 $re = qr/.*st[dw]u.*r1,-($x{1,8})\(r1\)/o; 82 } elsif ($arch =~ /^s390x?$/) { 83 # 11160: a7 fb ff 60 aghi %r15,-160 84 # or 85 # 100092: e3 f0 ff c8 ff 71 lay %r15,-56(%r15) 86 $re = qr/.*(?:lay|ag?hi).*\%r15,-(([0-9]{2}|[3-9])[0-9]{2}) 87 (?:\(\%r15\))?$/ox; 88 } elsif ($arch =~ /^sh64$/) { 89 #XXX: we only check for the immediate case presently, 90 # though we will want to check for the movi/sub 91 # pair for larger users. -- PFM. 92 #a00048e0: d4fc40f0 addi.l r15,-240,r15 93 $re = qr/.*addi\.l.*r15,-(([0-9]{2}|[3-9])[0-9]{2}),r15/o; 94 } elsif ($arch =~ /^blackfin$/) { 95 # 0: 00 e8 38 01 LINK 0x4e0; 96 $re = qr/.*[[:space:]]LINK[[:space:]]*(0x$x{1,8})/o; 97 } else { 98 print("wrong or unknown architecture \"$arch\"\n"); 99 exit 100 } 101} 102 103sub bysize($) { 104 my ($asize, $bsize); 105 ($asize = $a) =~ s/.*: *(.*)$/$1/; 106 ($bsize = $b) =~ s/.*: *(.*)$/$1/; 107 $bsize <=> $asize 108} 109 110# 111# main() 112# 113my $funcre = qr/^$x* <(.*)>:$/; 114my $func; 115my $file, $lastslash; 116 117while (my $line = <STDIN>) { 118 if ($line =~ m/$funcre/) { 119 $func = $1; 120 } 121 elsif ($line =~ m/(.*):\s*file format/) { 122 $file = $1; 123 $file =~ s/\.ko//; 124 $lastslash = rindex($file, "/"); 125 if ($lastslash != -1) { 126 $file = substr($file, $lastslash + 1); 127 } 128 } 129 elsif ($line =~ m/$re/) { 130 my $size = $1; 131 $size = hex($size) if ($size =~ /^0x/); 132 133 if ($size > 0xf0000000) { 134 $size = - $size; 135 $size += 0x80000000; 136 $size += 0x80000000; 137 } 138 next if ($size > 0x10000000); 139 140 next if $line !~ m/^($xs*)/; 141 my $addr = $1; 142 $addr =~ s/ /0/g; 143 $addr = "0x$addr"; 144 145 my $intro = "$addr $func [$file]:"; 146 my $padlen = 56 - length($intro); 147 while ($padlen > 0) { 148 $intro .= ' '; 149 $padlen -= 8; 150 } 151 next if ($size < 100); 152 push @stack, "$intro$size\n"; 153 } 154 elsif (defined $dre && $line =~ m/$dre/) { 155 my $size = "Dynamic ($1)"; 156 157 next if $line !~ m/^($xs*)/; 158 my $addr = $1; 159 $addr =~ s/ /0/g; 160 $addr = "0x$addr"; 161 162 my $intro = "$addr $func [$file]:"; 163 my $padlen = 56 - length($intro); 164 while ($padlen > 0) { 165 $intro .= ' '; 166 $padlen -= 8; 167 } 168 push @stack, "$intro$size\n"; 169 } 170} 171 172print sort bysize @stack; 173