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 <hskinnemoen@atmel.com> 16# PARISC port by Kyle McMartin <kyle@parisc-linux.org> 17# 18# Usage: 19# objdump -d vmlinux | scripts/checkstack.pl [arch] 20# 21# TODO : Port to all architectures (one regex per arch) 22 23# check for arch 24# 25# $re is used for two matches: 26# $& (whole re) matches the complete objdump line with the stack growth 27# $1 (first bracket) matches the size of the stack growth 28# 29# use anything else and feel the pain ;) 30my (@stack, $re, $x, $xs); 31{ 32 my $arch = shift; 33 if ($arch eq "") { 34 $arch = `uname -m`; 35 } 36 37 $x = "[0-9a-f]"; # hex character 38 $xs = "[0-9a-f ]"; # hex character or space 39 if ($arch eq 'arm') { 40 #c0008ffc: e24dd064 sub sp, sp, #100 ; 0x64 41 $re = qr/.*sub.*sp, sp, #(([0-9]{2}|[3-9])[0-9]{2})/o; 42 } elsif ($arch eq 'avr32') { 43 #8000008a: 20 1d sub sp,4 44 #80000ca8: fa cd 05 b0 sub sp,sp,1456 45 $re = qr/^.*sub.*sp.*,([0-9]{1,8})/o; 46 } elsif ($arch =~ /^i[3456]86$/) { 47 #c0105234: 81 ec ac 05 00 00 sub $0x5ac,%esp 48 $re = qr/^.*[as][du][db] \$(0x$x{1,8}),\%esp$/o; 49 } elsif ($arch eq 'x86_64') { 50 # 2f60: 48 81 ec e8 05 00 00 sub $0x5e8,%rsp 51 $re = qr/^.*[as][du][db] \$(0x$x{1,8}),\%rsp$/o; 52 } elsif ($arch eq 'ia64') { 53 #e0000000044011fc: 01 0f fc 8c adds r12=-384,r12 54 $re = qr/.*adds.*r12=-(([0-9]{2}|[3-9])[0-9]{2}),r12/o; 55 } elsif ($arch eq 'm68k') { 56 # 2b6c: 4e56 fb70 linkw %fp,#-1168 57 # 1df770: defc ffe4 addaw #-28,%sp 58 $re = qr/.*(?:linkw %fp,|addaw )#-([0-9]{1,4})(?:,%sp)?$/o; 59 } elsif ($arch eq 'mips64') { 60 #8800402c: 67bdfff0 daddiu sp,sp,-16 61 $re = qr/.*daddiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o; 62 } elsif ($arch eq 'mips') { 63 #88003254: 27bdffe0 addiu sp,sp,-32 64 $re = qr/.*addiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o; 65 } elsif ($arch eq 'parisc' || $arch eq 'parisc64') { 66 $re = qr/.*ldo ($x{1,8})\(sp\),sp/o; 67 } elsif ($arch eq 'ppc') { 68 #c00029f4: 94 21 ff 30 stwu r1,-208(r1) 69 $re = qr/.*stwu.*r1,-($x{1,8})\(r1\)/o; 70 } elsif ($arch eq 'ppc64') { 71 #XXX 72 $re = qr/.*stdu.*r1,-($x{1,8})\(r1\)/o; 73 } elsif ($arch eq 'powerpc') { 74 $re = qr/.*st[dw]u.*r1,-($x{1,8})\(r1\)/o; 75 } elsif ($arch =~ /^s390x?$/) { 76 # 11160: a7 fb ff 60 aghi %r15,-160 77 $re = qr/.*ag?hi.*\%r15,-(([0-9]{2}|[3-9])[0-9]{2})/o; 78 } elsif ($arch =~ /^sh64$/) { 79 #XXX: we only check for the immediate case presently, 80 # though we will want to check for the movi/sub 81 # pair for larger users. -- PFM. 82 #a00048e0: d4fc40f0 addi.l r15,-240,r15 83 $re = qr/.*addi\.l.*r15,-(([0-9]{2}|[3-9])[0-9]{2}),r15/o; 84 } elsif ($arch =~ /^blackfin$/) { 85 # 0: 00 e8 38 01 LINK 0x4e0; 86 $re = qr/.*[[:space:]]LINK[[:space:]]*(0x$x{1,8})/o; 87 } else { 88 print("wrong or unknown architecture\n"); 89 exit 90 } 91} 92 93sub bysize($) { 94 my ($asize, $bsize); 95 ($asize = $a) =~ s/.*: *(.*)$/$1/; 96 ($bsize = $b) =~ s/.*: *(.*)$/$1/; 97 $bsize <=> $asize 98} 99 100# 101# main() 102# 103my $funcre = qr/^$x* <(.*)>:$/; 104my $func; 105my $file, $lastslash; 106 107while (my $line = <STDIN>) { 108 if ($line =~ m/$funcre/) { 109 $func = $1; 110 } 111 elsif ($line =~ m/(.*):\s*file format/) { 112 $file = $1; 113 $file =~ s/\.ko//; 114 $lastslash = rindex($file, "/"); 115 if ($lastslash != -1) { 116 $file = substr($file, $lastslash + 1); 117 } 118 } 119 elsif ($line =~ m/$re/) { 120 my $size = $1; 121 $size = hex($size) if ($size =~ /^0x/); 122 123 if ($size > 0xf0000000) { 124 $size = - $size; 125 $size += 0x80000000; 126 $size += 0x80000000; 127 } 128 next if ($size > 0x10000000); 129 130 next if $line !~ m/^($xs*)/; 131 my $addr = $1; 132 $addr =~ s/ /0/g; 133 $addr = "0x$addr"; 134 135 my $intro = "$addr $func [$file]:"; 136 my $padlen = 56 - length($intro); 137 while ($padlen > 0) { 138 $intro .= ' '; 139 $padlen -= 8; 140 } 141 next if ($size < 100); 142 push @stack, "$intro$size\n"; 143 } 144} 145 146print sort bysize @stack; 147