[mirror_ubuntu-zesty-kernel.git] / scripts / checkstack.pl

#!/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 eq 'powerpc') {
		$re = qr/.*st[dw]u.*r1,-($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;
my $file, $lastslash;

while (my $line = <STDIN>) {
	if ($line =~ m/$funcre/) {
		$func = $1;
	}
	elsif ($line =~ m/(.*):\s*file format/) {
		$file = $1;
		$file =~ s/\.ko//;
		$lastslash = rindex($file, "/");
		if ($lastslash != -1) {
			$file = substr($file, $lastslash + 1);
		}
	}
	elsif ($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 $func [$file]:";
		my $padlen = 56 - length($intro);
		while ($padlen > 0) {
			$intro .= '	';
			$padlen -= 8;
		}
		next if ($size < 100);
		push @stack, "$intro$size\n";
	}
}

print sort bysize @stack;
Commit	Line	Data
1da177e4 LT	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 ;)
	28	my (@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;
271c511d JB	65	} elsif ($arch eq 'powerpc') {
271c511d JB	66	$re = qr/.st[dw]u.r1,-($x{1,8})\(r1\)/o;
1da177e4 LT	67	} elsif ($arch =~ /^s390x?$/) {
	68	# 11160: a7 fb ff 60 aghi %r15,-160
	69	$re = qr/.ag?hi.\%r15,-(([0-9]{2}\|[3-9])[0-9]{2})/o;
	70	} elsif ($arch =~ /^sh64$/) {
	71	#XXX: we only check for the immediate case presently,
	72	# though we will want to check for the movi/sub
	73	# pair for larger users. -- PFM.
	74	#a00048e0: d4fc40f0 addi.l r15,-240,r15
	75	$re = qr/.addi\.l.r15,-(([0-9]{2}\|[3-9])[0-9]{2}),r15/o;
	76	} else {
	77	print("wrong or unknown architecture\n");
	78	exit
	79	}
	80	}
	81
	82	sub bysize($) {
	83	my ($asize, $bsize);
	84	($asize = $a) =~ s/.: (.*)$/$1/;
	85	($bsize = $b) =~ s/.: (.*)$/$1/;
	86	$bsize <=> $asize
	87	}
	88
	89	#
	90	# main()
	91	#
	92	my $funcre = qr/^$x* <(.*)>:$/;
	93	my $func;
8ad2914d RD	94	my $file, $lastslash;
8ad2914d RD	95
1da177e4 LT	96	while (my $line = <STDIN>) {
	97	if ($line =~ m/$funcre/) {
	98	$func = $1;
	99	}
8ad2914d RD	100	elsif ($line =~ m/(.):\sfile format/) {
	101	$file = $1;
	102	$file =~ s/\.ko//;
	103	$lastslash = rindex($file, "/");
	104	if ($lastslash != -1) {
	105	$file = substr($file, $lastslash + 1);
	106	}
	107	}
	108	elsif ($line =~ m/$re/) {
1da177e4 LT	109	my $size = $1;
	110	$size = hex($size) if ($size =~ /^0x/);
	111
	112	if ($size > 0xf0000000) {
	113	$size = - $size;
	114	$size += 0x80000000;
	115	$size += 0x80000000;
	116	}
	117	next if ($size > 0x10000000);
	118
	119	next if $line !~ m/^($xs*)/;
	120	my $addr = $1;
	121	$addr =~ s/ /0/g;
	122	$addr = "0x$addr";
	123
8ad2914d	124	my $intro = "$addr $func [$file]:";
1da177e4 LT	125	my $padlen = 56 - length($intro);
	126	while ($padlen > 0) {
	127	$intro .= ' ';
	128	$padlen -= 8;
	129	}
	130	next if ($size < 100);
	131	push @stack, "$intro$size\n";
	132	}
	133	}
	134
	135	print sort bysize @stack;