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