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 (Atmel) 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 24use strict; 25 26# check for arch 27# 28# $re is used for two matches: 29# $& (whole re) matches the complete objdump line with the stack growth 30# $1 (first bracket) matches the size of the stack growth 31# 32# $dre is similar, but for dynamic stack redutions: 33# $& (whole re) matches the complete objdump line with the stack growth 34# $1 (first bracket) matches the dynamic amount of the stack growth 35# 36# use anything else and feel the pain ;) 37my (@stack, $re, $dre, $x, $xs, $funcre); 38{ 39 my $arch = shift; 40 if ($arch eq "") { 41 $arch = `uname -m`; 42 chomp($arch); 43 } 44 45 $x = "[0-9a-f]"; # hex character 46 $xs = "[0-9a-f ]"; # hex character or space 47 $funcre = qr/^$x* <(.*)>:$/; 48 if ($arch eq 'arm') { 49 #c0008ffc: e24dd064 sub sp, sp, #100 ; 0x64 50 $re = qr/.*sub.*sp, sp, #(([0-9]{2}|[3-9])[0-9]{2})/o; 51 } elsif ($arch eq 'avr32') { 52 #8000008a: 20 1d sub sp,4 53 #80000ca8: fa cd 05 b0 sub sp,sp,1456 54 $re = qr/^.*sub.*sp.*,([0-9]{1,8})/o; 55 } elsif ($arch =~ /^i[3456]86$/) { 56 #c0105234: 81 ec ac 05 00 00 sub $0x5ac,%esp 57 $re = qr/^.*[as][du][db] \$(0x$x{1,8}),\%esp$/o; 58 $dre = qr/^.*[as][du][db] (%.*),\%esp$/o; 59 } elsif ($arch eq 'x86_64') { 60 # 2f60: 48 81 ec e8 05 00 00 sub $0x5e8,%rsp 61 $re = qr/^.*[as][du][db] \$(0x$x{1,8}),\%rsp$/o; 62 $dre = qr/^.*[as][du][db] (\%.*),\%rsp$/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 'metag') { 71 #400026fc: 40 00 00 82 ADD A0StP,A0StP,#0x8 72 $re = qr/.*ADD.*A0StP,A0StP,\#(0x$x{1,8})/o; 73 $funcre = qr/^$x* <[^\$](.*)>:$/; 74 } elsif ($arch eq 'mips64') { 75 #8800402c: 67bdfff0 daddiu sp,sp,-16 76 $re = qr/.*daddiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o; 77 } elsif ($arch eq 'mips') { 78 #88003254: 27bdffe0 addiu sp,sp,-32 79 $re = qr/.*addiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o; 80 } elsif ($arch eq 'parisc' || $arch eq 'parisc64') { 81 $re = qr/.*ldo ($x{1,8})\(sp\),sp/o; 82 } elsif ($arch eq 'ppc') { 83 #c00029f4: 94 21 ff 30 stwu r1,-208(r1) 84 $re = qr/.*stwu.*r1,-($x{1,8})\(r1\)/o; 85 } elsif ($arch eq 'ppc64') { 86 #XXX 87 $re = qr/.*stdu.*r1,-($x{1,8})\(r1\)/o; 88 } elsif ($arch eq 'powerpc') { 89 $re = qr/.*st[dw]u.*r1,-($x{1,8})\(r1\)/o; 90 } elsif ($arch =~ /^s390x?$/) { 91 # 11160: a7 fb ff 60 aghi %r15,-160 92 # or 93 # 100092: e3 f0 ff c8 ff 71 lay %r15,-56(%r15) 94 $re = qr/.*(?:lay|ag?hi).*\%r15,-(([0-9]{2}|[3-9])[0-9]{2}) 95 (?:\(\%r15\))?$/ox; 96 } elsif ($arch =~ /^sh64$/) { 97 #XXX: we only check for the immediate case presently, 98 # though we will want to check for the movi/sub 99 # pair for larger users. -- PFM. 100 #a00048e0: d4fc40f0 addi.l r15,-240,r15 101 $re = qr/.*addi\.l.*r15,-(([0-9]{2}|[3-9])[0-9]{2}),r15/o; 102 } elsif ($arch =~ /^blackfin$/) { 103 # 0: 00 e8 38 01 LINK 0x4e0; 104 $re = qr/.*[[:space:]]LINK[[:space:]]*(0x$x{1,8})/o; 105 } elsif ($arch eq 'sparc' || $arch eq 'sparc64') { 106 # f0019d10: 9d e3 bf 90 save %sp, -112, %sp 107 $re = qr/.*save.*%sp, -(([0-9]{2}|[3-9])[0-9]{2}), %sp/o; 108 } else { 109 print("wrong or unknown architecture \"$arch\"\n"); 110 exit 111 } 112} 113 114# 115# main() 116# 117my ($func, $file, $lastslash); 118 119while (my $line = <STDIN>) { 120 if ($line =~ m/$funcre/) { 121 $func = $1; 122 } 123 elsif ($line =~ m/(.*):\s*file format/) { 124 $file = $1; 125 $file =~ s/\.ko//; 126 $lastslash = rindex($file, "/"); 127 if ($lastslash != -1) { 128 $file = substr($file, $lastslash + 1); 129 } 130 } 131 elsif ($line =~ m/$re/) { 132 my $size = $1; 133 $size = hex($size) if ($size =~ /^0x/); 134 135 if ($size > 0xf0000000) { 136 $size = - $size; 137 $size += 0x80000000; 138 $size += 0x80000000; 139 } 140 next if ($size > 0x10000000); 141 142 next if $line !~ m/^($xs*)/; 143 my $addr = $1; 144 $addr =~ s/ /0/g; 145 $addr = "0x$addr"; 146 147 my $intro = "$addr $func [$file]:"; 148 my $padlen = 56 - length($intro); 149 while ($padlen > 0) { 150 $intro .= ' '; 151 $padlen -= 8; 152 } 153 next if ($size < 100); 154 push @stack, "$intro$size\n"; 155 } 156 elsif (defined $dre && $line =~ m/$dre/) { 157 my $size = "Dynamic ($1)"; 158 159 next if $line !~ m/^($xs*)/; 160 my $addr = $1; 161 $addr =~ s/ /0/g; 162 $addr = "0x$addr"; 163 164 my $intro = "$addr $func [$file]:"; 165 my $padlen = 56 - length($intro); 166 while ($padlen > 0) { 167 $intro .= ' '; 168 $padlen -= 8; 169 } 170 push @stack, "$intro$size\n"; 171 } 172} 173 174# Sort output by size (last field) 175print sort { ($b =~ /:\t*(\d+)$/)[0] <=> ($a =~ /:\t*(\d+)$/)[0] } @stack; 176