1#!/usr/bin/perl 2 3# Check the stack usage of functions 4# 5# Copyright Joern Engel <joern@wh.fh-wedel.de> 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# 17# Usage: 18# objdump -d vmlinux | stackcheck.pl [arch] 19# 20# TODO : Port to all architectures (one regex per arch) 21 22# check for arch 23# 24# $re is used for two matches: 25# $& (whole re) matches the complete objdump line with the stack growth 26# $1 (first bracket) matches the size of the stack growth 27# 28# use anything else and feel the pain ;) 29my (@stack, $re, $x, $xs); 30{ 31 my $arch = shift; 32 if ($arch eq "") { 33 $arch = `uname -m`; 34 } 35 36 $x = "[0-9a-f]"; # hex character 37 $xs = "[0-9a-f ]"; # hex character or space 38 if ($arch eq 'arm') { 39 #c0008ffc: e24dd064 sub sp, sp, #100 ; 0x64 40 $re = qr/.*sub.*sp, sp, #(([0-9]{2}|[3-9])[0-9]{2})/o; 41 } elsif ($arch eq 'avr32') { 42 #8000008a: 20 1d sub sp,4 43 #80000ca8: fa cd 05 b0 sub sp,sp,1456 44 $re = qr/^.*sub.*sp.*,([0-9]{1,8})/o; 45 } elsif ($arch =~ /^i[3456]86$/) { 46 #c0105234: 81 ec ac 05 00 00 sub $0x5ac,%esp 47 $re = qr/^.*[as][du][db] \$(0x$x{1,8}),\%esp$/o; 48 } elsif ($arch eq 'x86_64') { 49 # 2f60: 48 81 ec e8 05 00 00 sub $0x5e8,%rsp 50 $re = qr/^.*[as][du][db] \$(0x$x{1,8}),\%rsp$/o; 51 } elsif ($arch eq 'ia64') { 52 #e0000000044011fc: 01 0f fc 8c adds r12=-384,r12 53 $re = qr/.*adds.*r12=-(([0-9]{2}|[3-9])[0-9]{2}),r12/o; 54 } elsif ($arch eq 'm68k') { 55 # 2b6c: 4e56 fb70 linkw %fp,#-1168 56 # 1df770: defc ffe4 addaw #-28,%sp 57 $re = qr/.*(?:linkw %fp,|addaw )#-([0-9]{1,4})(?:,%sp)?$/o; 58 } elsif ($arch eq 'mips64') { 59 #8800402c: 67bdfff0 daddiu sp,sp,-16 60 $re = qr/.*daddiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o; 61 } elsif ($arch eq 'mips') { 62 #88003254: 27bdffe0 addiu sp,sp,-32 63 $re = qr/.*addiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o; 64 } elsif ($arch eq 'ppc') { 65 #c00029f4: 94 21 ff 30 stwu r1,-208(r1) 66 $re = qr/.*stwu.*r1,-($x{1,8})\(r1\)/o; 67 } elsif ($arch eq 'ppc64') { 68 #XXX 69 $re = qr/.*stdu.*r1,-($x{1,8})\(r1\)/o; 70 } elsif ($arch eq 'powerpc') { 71 $re = qr/.*st[dw]u.*r1,-($x{1,8})\(r1\)/o; 72 } elsif ($arch =~ /^s390x?$/) { 73 # 11160: a7 fb ff 60 aghi %r15,-160 74 $re = qr/.*ag?hi.*\%r15,-(([0-9]{2}|[3-9])[0-9]{2})/o; 75 } elsif ($arch =~ /^sh64$/) { 76 #XXX: we only check for the immediate case presently, 77 # though we will want to check for the movi/sub 78 # pair for larger users. -- PFM. 79 #a00048e0: d4fc40f0 addi.l r15,-240,r15 80 $re = qr/.*addi\.l.*r15,-(([0-9]{2}|[3-9])[0-9]{2}),r15/o; 81 } else { 82 print("wrong or unknown architecture\n"); 83 exit 84 } 85} 86 87sub bysize($) { 88 my ($asize, $bsize); 89 ($asize = $a) =~ s/.*: *(.*)$/$1/; 90 ($bsize = $b) =~ s/.*: *(.*)$/$1/; 91 $bsize <=> $asize 92} 93 94# 95# main() 96# 97my $funcre = qr/^$x* <(.*)>:$/; 98my $func; 99my $file, $lastslash; 100 101while (my $line = <STDIN>) { 102 if ($line =~ m/$funcre/) { 103 $func = $1; 104 } 105 elsif ($line =~ m/(.*):\s*file format/) { 106 $file = $1; 107 $file =~ s/\.ko//; 108 $lastslash = rindex($file, "/"); 109 if ($lastslash != -1) { 110 $file = substr($file, $lastslash + 1); 111 } 112 } 113 elsif ($line =~ m/$re/) { 114 my $size = $1; 115 $size = hex($size) if ($size =~ /^0x/); 116 117 if ($size > 0xf0000000) { 118 $size = - $size; 119 $size += 0x80000000; 120 $size += 0x80000000; 121 } 122 next if ($size > 0x10000000); 123 124 next if $line !~ m/^($xs*)/; 125 my $addr = $1; 126 $addr =~ s/ /0/g; 127 $addr = "0x$addr"; 128 129 my $intro = "$addr $func [$file]:"; 130 my $padlen = 56 - length($intro); 131 while ($padlen > 0) { 132 $intro .= ' '; 133 $padlen -= 8; 134 } 135 next if ($size < 100); 136 push @stack, "$intro$size\n"; 137 } 138} 139 140print sort bysize @stack; 141