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 =~ /^x86(_64)?$/ || $arch =~ /^i[3456]86$/) { 56 #c0105234: 81 ec ac 05 00 00 sub $0x5ac,%esp 57 # or 58 # 2f60: 48 81 ec e8 05 00 00 sub $0x5e8,%rsp 59 $re = qr/^.*[as][du][db] \$(0x$x{1,8}),\%(e|r)sp$/o; 60 $dre = qr/^.*[as][du][db] (%.*),\%(e|r)sp$/o; 61 } elsif ($arch eq 'ia64') { 62 #e0000000044011fc: 01 0f fc 8c adds r12=-384,r12 63 $re = qr/.*adds.*r12=-(([0-9]{2}|[3-9])[0-9]{2}),r12/o; 64 } elsif ($arch eq 'm68k') { 65 # 2b6c: 4e56 fb70 linkw %fp,#-1168 66 # 1df770: defc ffe4 addaw #-28,%sp 67 $re = qr/.*(?:linkw %fp,|addaw )#-([0-9]{1,4})(?:,%sp)?$/o; 68 } elsif ($arch eq 'metag') { 69 #400026fc: 40 00 00 82 ADD A0StP,A0StP,#0x8 70 $re = qr/.*ADD.*A0StP,A0StP,\#(0x$x{1,8})/o; 71 $funcre = qr/^$x* <[^\$](.*)>:$/; 72 } elsif ($arch eq 'mips64') { 73 #8800402c: 67bdfff0 daddiu sp,sp,-16 74 $re = qr/.*daddiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o; 75 } elsif ($arch eq 'mips') { 76 #88003254: 27bdffe0 addiu sp,sp,-32 77 $re = qr/.*addiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o; 78 } elsif ($arch eq 'parisc' || $arch eq 'parisc64') { 79 $re = qr/.*ldo ($x{1,8})\(sp\),sp/o; 80 } elsif ($arch eq 'ppc') { 81 #c00029f4: 94 21 ff 30 stwu r1,-208(r1) 82 $re = qr/.*stwu.*r1,-($x{1,8})\(r1\)/o; 83 } elsif ($arch eq 'ppc64') { 84 #XXX 85 $re = qr/.*stdu.*r1,-($x{1,8})\(r1\)/o; 86 } elsif ($arch eq 'powerpc') { 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 =~ /^blackfin$/) { 101 # 0: 00 e8 38 01 LINK 0x4e0; 102 $re = qr/.*[[:space:]]LINK[[:space:]]*(0x$x{1,8})/o; 103 } elsif ($arch eq 'sparc' || $arch eq 'sparc64') { 104 # f0019d10: 9d e3 bf 90 save %sp, -112, %sp 105 $re = qr/.*save.*%sp, -(([0-9]{2}|[3-9])[0-9]{2}), %sp/o; 106 } else { 107 print("wrong or unknown architecture \"$arch\"\n"); 108 exit 109 } 110} 111 112# 113# main() 114# 115my ($func, $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$size\n"; 169 } 170} 171 172# Sort output by size (last field) 173print sort { ($b =~ /:\t*(\d+)$/)[0] <=> ($a =~ /:\t*(\d+)$/)[0] } @stack; 174