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); 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 $xs = "[0-9a-f ]"; # hex character or space 47 if ($arch eq 'arm') { 48 #c0008ffc: e24dd064 sub sp, sp, #100 ; 0x64 49 $re = qr/.*sub.*sp, sp, #(([0-9]{2}|[3-9])[0-9]{2})/o; 50 } elsif ($arch eq 'avr32') { 51 #8000008a: 20 1d sub sp,4 52 #80000ca8: fa cd 05 b0 sub sp,sp,1456 53 $re = qr/^.*sub.*sp.*,([0-9]{1,8})/o; 54 } elsif ($arch =~ /^i[3456]86$/) { 55 #c0105234: 81 ec ac 05 00 00 sub $0x5ac,%esp 56 $re = qr/^.*[as][du][db] \$(0x$x{1,8}),\%esp$/o; 57 $dre = qr/^.*[as][du][db] (%.*),\%esp$/o; 58 } elsif ($arch eq 'x86_64') { 59 # 2f60: 48 81 ec e8 05 00 00 sub $0x5e8,%rsp 60 $re = qr/^.*[as][du][db] \$(0x$x{1,8}),\%rsp$/o; 61 $dre = qr/^.*[as][du][db] (\%.*),\%rsp$/o; 62 } elsif ($arch eq 'ia64') { 63 #e0000000044011fc: 01 0f fc 8c adds r12=-384,r12 64 $re = qr/.*adds.*r12=-(([0-9]{2}|[3-9])[0-9]{2}),r12/o; 65 } elsif ($arch eq 'm68k') { 66 # 2b6c: 4e56 fb70 linkw %fp,#-1168 67 # 1df770: defc ffe4 addaw #-28,%sp 68 $re = qr/.*(?:linkw %fp,|addaw )#-([0-9]{1,4})(?:,%sp)?$/o; 69 } elsif ($arch eq 'mips64') { 70 #8800402c: 67bdfff0 daddiu sp,sp,-16 71 $re = qr/.*daddiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o; 72 } elsif ($arch eq 'mips') { 73 #88003254: 27bdffe0 addiu sp,sp,-32 74 $re = qr/.*addiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o; 75 } elsif ($arch eq 'parisc' || $arch eq 'parisc64') { 76 $re = qr/.*ldo ($x{1,8})\(sp\),sp/o; 77 } elsif ($arch eq 'ppc') { 78 #c00029f4: 94 21 ff 30 stwu r1,-208(r1) 79 $re = qr/.*stwu.*r1,-($x{1,8})\(r1\)/o; 80 } elsif ($arch eq 'ppc64') { 81 #XXX 82 $re = qr/.*stdu.*r1,-($x{1,8})\(r1\)/o; 83 } elsif ($arch eq 'powerpc') { 84 $re = qr/.*st[dw]u.*r1,-($x{1,8})\(r1\)/o; 85 } elsif ($arch =~ /^s390x?$/) { 86 # 11160: a7 fb ff 60 aghi %r15,-160 87 # or 88 # 100092: e3 f0 ff c8 ff 71 lay %r15,-56(%r15) 89 $re = qr/.*(?:lay|ag?hi).*\%r15,-(([0-9]{2}|[3-9])[0-9]{2}) 90 (?:\(\%r15\))?$/ox; 91 } elsif ($arch =~ /^sh64$/) { 92 #XXX: we only check for the immediate case presently, 93 # though we will want to check for the movi/sub 94 # pair for larger users. -- PFM. 95 #a00048e0: d4fc40f0 addi.l r15,-240,r15 96 $re = qr/.*addi\.l.*r15,-(([0-9]{2}|[3-9])[0-9]{2}),r15/o; 97 } elsif ($arch =~ /^blackfin$/) { 98 # 0: 00 e8 38 01 LINK 0x4e0; 99 $re = qr/.*[[:space:]]LINK[[:space:]]*(0x$x{1,8})/o; 100 } elsif ($arch eq 'sparc' || $arch eq 'sparc64') { 101 # f0019d10: 9d e3 bf 90 save %sp, -112, %sp 102 $re = qr/.*save.*%sp, -(([0-9]{2}|[3-9])[0-9]{2}), %sp/o; 103 } else { 104 print("wrong or unknown architecture \"$arch\"\n"); 105 exit 106 } 107} 108 109# 110# main() 111# 112my $funcre = qr/^$x* <(.*)>:$/; 113my ($func, $file, $lastslash); 114 115while (my $line = <STDIN>) { 116 if ($line =~ m/$funcre/) { 117 $func = $1; 118 } 119 elsif ($line =~ m/(.*):\s*file format/) { 120 $file = $1; 121 $file =~ s/\.ko//; 122 $lastslash = rindex($file, "/"); 123 if ($lastslash != -1) { 124 $file = substr($file, $lastslash + 1); 125 } 126 } 127 elsif ($line =~ m/$re/) { 128 my $size = $1; 129 $size = hex($size) if ($size =~ /^0x/); 130 131 if ($size > 0xf0000000) { 132 $size = - $size; 133 $size += 0x80000000; 134 $size += 0x80000000; 135 } 136 next if ($size > 0x10000000); 137 138 next if $line !~ m/^($xs*)/; 139 my $addr = $1; 140 $addr =~ s/ /0/g; 141 $addr = "0x$addr"; 142 143 my $intro = "$addr $func [$file]:"; 144 my $padlen = 56 - length($intro); 145 while ($padlen > 0) { 146 $intro .= ' '; 147 $padlen -= 8; 148 } 149 next if ($size < 100); 150 push @stack, "$intro$size\n"; 151 } 152 elsif (defined $dre && $line =~ m/$dre/) { 153 my $size = "Dynamic ($1)"; 154 155 next if $line !~ m/^($xs*)/; 156 my $addr = $1; 157 $addr =~ s/ /0/g; 158 $addr = "0x$addr"; 159 160 my $intro = "$addr $func [$file]:"; 161 my $padlen = 56 - length($intro); 162 while ($padlen > 0) { 163 $intro .= ' '; 164 $padlen -= 8; 165 } 166 push @stack, "$intro$size\n"; 167 } 168} 169 170# Sort output by size (last field) 171print sort { ($b =~ /:\t*(\d+)$/)[0] <=> ($a =~ /:\t*(\d+)$/)[0] } @stack; 172