Commit 3a76313b authored by Andrew Morton's avatar Andrew Morton Committed by Linus Torvalds

[PATCH] Add `make checkstack' target

Jorn Engel <joern@wohnheim.fh-wedel.de>

Adds a `make checkstack' target.  This disassembles and parses vmlinux and
*.ko, generating a sorted list of stack hogs, eg:

0xc0100663 huft_build:                                  1456
0xc01022d3 huft_build:                                  1456
0xc0103127 inflate_dynamic:                             1328
0xc0101487 inflate_dynamic:                             1324
0xc010131f inflate_fixed:                               1168
0xc0102fb7 inflate_fixed:                               1168
0x00000003 sha512_transform:                            984
0xc024aee3 Vpd:                                         952
0x00000003 twofish_setkey:                              804
0x000060c3 isd200_action:                               792
0x0000e6cb nfsd4_proc_compound:                         760
0xc0249087 SkPnmiGetStruct:                             712
....


Supported architectures are alleged to be arm, x86, ia64, mips, mips64, ppc,
ppc64 and s390x.
Signed-off-by: default avatarJörn Engel <joern@wohnheim.fh-wedel.de>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 969d8911
......@@ -1065,6 +1065,11 @@ buildcheck:
endif #ifeq ($(config-targets),1)
endif #ifeq ($(mixed-targets),1)
.PHONY: checkstack
checkstack:
$(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
$(PERL) scripts/checkstack.pl $(ARCH)
# FIXME Should go into a make.lib or something
# ===========================================================================
......
#!/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
# Random bits by Matt Mackall <mpm@selenic.com>
#
# Usage:
# objdump -d vmlinux | stackcheck_ppc.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 $arch = shift;
if ($arch eq "") {
$arch = `uname -m`;
}
$x = "[0-9a-f]"; # hex character
$xs = "[0-9a-f ]"; # hex character or space
if ($arch =~ /^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
$re = qr/^.*sub \$(0x$x{3,5}),\%esp$/o;
} elsif ($arch =~ /^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 =~ /^mips64$/) {
#8800402c: 67bdfff0 daddiu sp,sp,-16
$re = qr/.*daddiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
} elsif ($arch =~ /^mips$/) {
#88003254: 27bdffe0 addiu sp,sp,-32
$re = qr/.*addiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
} elsif ($arch =~ /^ppc$/) {
#c00029f4: 94 21 ff 30 stwu r1,-208(r1)
$re = qr/.*stwu.*r1,-($x{3,5})\(r1\)/o;
} elsif ($arch =~ /^ppc64$/) {
#XXX
$re = qr/.*stdu.*r1,-($x{3,5})\(r1\)/o;
} elsif ($arch =~ /^s390x?$/) {
# 11160: a7 fb ff 60 aghi %r15,-160
$re = qr/.*ag?hi.*\%r15,-(([0-9]{2}|[3-9])[0-9]{2})/o;
} else {
print("wrong or unknown architecture\n");
exit
}
}
sub bysize($) {
($asize = $a) =~ s/.* +(.*)$/$1/;
($bsize = $b) =~ s/.* +(.*)$/$1/;
$bsize <=> $asize
}
#
# main()
#
$funcre = qr/^$x* \<(.*)\>:$/;
while ($line = <STDIN>) {
if ($line =~ m/$funcre/) {
$func = $1;
}
if ($line =~ m/$re/) {
my $size = $1;
$size = hex($size) if ($size =~ /^0x/);
$line =~ m/^($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;
}
$stack[@stack] = "$intro$size\n";
}
}
@sortedstack = sort bysize @stack;
foreach $i (@sortedstack) {
print("$i");
}
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