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Diffstat (limited to 'scripts/checkstack.pl')
| -rw-r--r-- | scripts/checkstack.pl | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/scripts/checkstack.pl b/scripts/checkstack.pl new file mode 100644 index 0000000..dadfa20 --- /dev/null +++ b/scripts/checkstack.pl @@ -0,0 +1,123 @@ +#!/usr/bin/perl + +# Check the stack usage of functions +# +# Copyright Joern Engel <joern@wh.fh-wedel.de> +# Inspired by Linus Torvalds +# Original idea maybe from Keith Owens +# s390 port and big speedup by Arnd Bergmann <arnd@bergmann-dalldorf.de> +# Mips port by Juan Quintela <quintela@mandrakesoft.com> +# IA64 port via Andreas Dilger +# Arm port by Holger Schurig +# sh64 port by Paul Mundt +# Random bits by Matt Mackall <mpm@selenic.com> +# M68k port by Geert Uytterhoeven and Andreas Schwab +# +# Usage: +# objdump -d vmlinux | stackcheck.pl [arch] +# +# TODO : Port to all architectures (one regex per arch) + +# check for arch +# +# $re is used for two matches: +# $& (whole re) matches the complete objdump line with the stack growth +# $1 (first bracket) matches the size of the stack growth +# +# use anything else and feel the pain ;) +my (@stack, $re, $x, $xs); +{ + my $arch = shift; + if ($arch eq "") { + $arch = `uname -m`; + } + + $x = "[0-9a-f]"; # hex character + $xs = "[0-9a-f ]"; # hex character or space + if ($arch eq 'arm') { + #c0008ffc: e24dd064 sub sp, sp, #100 ; 0x64 + $re = qr/.*sub.*sp, sp, #(([0-9]{2}|[3-9])[0-9]{2})/o; + } elsif ($arch =~ /^i[3456]86$/) { + #c0105234: 81 ec ac 05 00 00 sub $0x5ac,%esp + $re = qr/^.*[as][du][db] \$(0x$x{1,8}),\%esp$/o; + } elsif ($arch eq 'x86_64') { + # 2f60: 48 81 ec e8 05 00 00 sub $0x5e8,%rsp + $re = qr/^.*[as][du][db] \$(0x$x{1,8}),\%rsp$/o; + } elsif ($arch eq 'ia64') { + #e0000000044011fc: 01 0f fc 8c adds r12=-384,r12 + $re = qr/.*adds.*r12=-(([0-9]{2}|[3-9])[0-9]{2}),r12/o; + } elsif ($arch eq 'm68k') { + # 2b6c: 4e56 fb70 linkw %fp,#-1168 + # 1df770: defc ffe4 addaw #-28,%sp + $re = qr/.*(?:linkw %fp,|addaw )#-([0-9]{1,4})(?:,%sp)?$/o; + } elsif ($arch eq 'mips64') { + #8800402c: 67bdfff0 daddiu sp,sp,-16 + $re = qr/.*daddiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o; + } elsif ($arch eq 'mips') { + #88003254: 27bdffe0 addiu sp,sp,-32 + $re = qr/.*addiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o; + } elsif ($arch eq 'ppc') { + #c00029f4: 94 21 ff 30 stwu r1,-208(r1) + $re = qr/.*stwu.*r1,-($x{1,8})\(r1\)/o; + } elsif ($arch eq 'ppc64') { + #XXX + $re = qr/.*stdu.*r1,-($x{1,8})\(r1\)/o; + } elsif ($arch =~ /^s390x?$/) { + # 11160: a7 fb ff 60 aghi %r15,-160 + $re = qr/.*ag?hi.*\%r15,-(([0-9]{2}|[3-9])[0-9]{2})/o; + } elsif ($arch =~ /^sh64$/) { + #XXX: we only check for the immediate case presently, + # though we will want to check for the movi/sub + # pair for larger users. -- PFM. + #a00048e0: d4fc40f0 addi.l r15,-240,r15 + $re = qr/.*addi\.l.*r15,-(([0-9]{2}|[3-9])[0-9]{2}),r15/o; + } else { + print("wrong or unknown architecture\n"); + exit + } +} + +sub bysize($) { + my ($asize, $bsize); + ($asize = $a) =~ s/.*: *(.*)$/$1/; + ($bsize = $b) =~ s/.*: *(.*)$/$1/; + $bsize <=> $asize +} + +# +# main() +# +my $funcre = qr/^$x* <(.*)>:$/; +my $func; +while (my $line = <STDIN>) { + if ($line =~ m/$funcre/) { + $func = $1; + } + if ($line =~ m/$re/) { + my $size = $1; + $size = hex($size) if ($size =~ /^0x/); + + if ($size > 0xf0000000) { + $size = - $size; + $size += 0x80000000; + $size += 0x80000000; + } + next if ($size > 0x10000000); + + next if $line !~ m/^($xs*)/; + my $addr = $1; + $addr =~ s/ /0/g; + $addr = "0x$addr"; + + my $intro = "$addr $func:"; + my $padlen = 56 - length($intro); + while ($padlen > 0) { + $intro .= ' '; + $padlen -= 8; + } + next if ($size < 100); + push @stack, "$intro$size\n"; + } +} + +print sort bysize @stack; |