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# Check the stack usage of functions
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# Copyright Joern Engel <joern@lazybastard.org>
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# Inspired by Linus Torvalds
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# Original idea maybe from Keith Owens
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# s390 port and big speedup by Arnd Bergmann <arnd@bergmann-dalldorf.de>
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# Mips port by Juan Quintela <quintela@mandrakesoft.com>
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# IA64 port via Andreas Dilger
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# Arm port by Holger Schurig
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# sh64 port by Paul Mundt
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# Random bits by Matt Mackall <mpm@selenic.com>
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# M68k port by Geert Uytterhoeven and Andreas Schwab
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# AVR32 port by Haavard Skinnemoen (Atmel)
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# PARISC port by Kyle McMartin <kyle@parisc-linux.org>
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# sparc port by Martin Habets <errandir_news@mph.eclipse.co.uk>
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# objdump -d vmlinux | scripts/checkstack.pl [arch]
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# TODO : Port to all architectures (one regex per arch)
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# $re is used for two matches:
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# $& (whole re) matches the complete objdump line with the stack growth
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# $1 (first bracket) matches the size of the stack growth
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# $dre is similar, but for dynamic stack redutions:
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# $& (whole re) matches the complete objdump line with the stack growth
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# $1 (first bracket) matches the dynamic amount of the stack growth
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# use anything else and feel the pain ;)
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my (@stack, $re, $dre, $x, $xs);
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$x = "[0-9a-f]"; # hex character
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$xs = "[0-9a-f ]"; # hex character or space
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#c0008ffc: e24dd064 sub sp, sp, #100 ; 0x64
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$re = qr/.*sub.*sp, sp, #(([0-9]{2}|[3-9])[0-9]{2})/o;
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} elsif ($arch eq 'avr32') {
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#8000008a: 20 1d sub sp,4
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#80000ca8: fa cd 05 b0 sub sp,sp,1456
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$re = qr/^.*sub.*sp.*,([0-9]{1,8})/o;
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} elsif ($arch =~ /^i[3456]86$/) {
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#c0105234: 81 ec ac 05 00 00 sub $0x5ac,%esp
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$re = qr/^.*[as][du][db] \$(0x$x{1,8}),\%esp$/o;
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$dre = qr/^.*[as][du][db] (%.*),\%esp$/o;
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} elsif ($arch eq 'x86_64') {
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# 2f60: 48 81 ec e8 05 00 00 sub $0x5e8,%rsp
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$re = qr/^.*[as][du][db] \$(0x$x{1,8}),\%rsp$/o;
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$dre = qr/^.*[as][du][db] (\%.*),\%rsp$/o;
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} elsif ($arch eq 'ia64') {
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#e0000000044011fc: 01 0f fc 8c adds r12=-384,r12
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$re = qr/.*adds.*r12=-(([0-9]{2}|[3-9])[0-9]{2}),r12/o;
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} elsif ($arch eq 'm68k') {
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# 2b6c: 4e56 fb70 linkw %fp,#-1168
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# 1df770: defc ffe4 addaw #-28,%sp
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$re = qr/.*(?:linkw %fp,|addaw )#-([0-9]{1,4})(?:,%sp)?$/o;
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} elsif ($arch eq 'mips64') {
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#8800402c: 67bdfff0 daddiu sp,sp,-16
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$re = qr/.*daddiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
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} elsif ($arch eq 'mips') {
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#88003254: 27bdffe0 addiu sp,sp,-32
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$re = qr/.*addiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
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} elsif ($arch eq 'parisc' || $arch eq 'parisc64') {
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$re = qr/.*ldo ($x{1,8})\(sp\),sp/o;
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} elsif ($arch eq 'ppc') {
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#c00029f4: 94 21 ff 30 stwu r1,-208(r1)
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$re = qr/.*stwu.*r1,-($x{1,8})\(r1\)/o;
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} elsif ($arch eq 'ppc64') {
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$re = qr/.*stdu.*r1,-($x{1,8})\(r1\)/o;
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} elsif ($arch eq 'powerpc') {
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$re = qr/.*st[dw]u.*r1,-($x{1,8})\(r1\)/o;
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} elsif ($arch =~ /^s390x?$/) {
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# 11160: a7 fb ff 60 aghi %r15,-160
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# 100092: e3 f0 ff c8 ff 71 lay %r15,-56(%r15)
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$re = qr/.*(?:lay|ag?hi).*\%r15,-(([0-9]{2}|[3-9])[0-9]{2})
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} elsif ($arch =~ /^sh64$/) {
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#XXX: we only check for the immediate case presently,
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# though we will want to check for the movi/sub
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# pair for larger users. -- PFM.
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#a00048e0: d4fc40f0 addi.l r15,-240,r15
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$re = qr/.*addi\.l.*r15,-(([0-9]{2}|[3-9])[0-9]{2}),r15/o;
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} elsif ($arch =~ /^blackfin$/) {
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# 0: 00 e8 38 01 LINK 0x4e0;
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$re = qr/.*[[:space:]]LINK[[:space:]]*(0x$x{1,8})/o;
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} elsif ($arch eq 'sparc' || $arch eq 'sparc64') {
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# f0019d10: 9d e3 bf 90 save %sp, -112, %sp
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$re = qr/.*save.*%sp, -(([0-9]{2}|[3-9])[0-9]{2}), %sp/o;
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print("wrong or unknown architecture \"$arch\"\n");
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my $funcre = qr/^$x* <(.*)>:$/;
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my ($func, $file, $lastslash);
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while (my $line = <STDIN>) {
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if ($line =~ m/$funcre/) {
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elsif ($line =~ m/(.*):\s*file format/) {
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$lastslash = rindex($file, "/");
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if ($lastslash != -1) {
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$file = substr($file, $lastslash + 1);
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elsif ($line =~ m/$re/) {
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$size = hex($size) if ($size =~ /^0x/);
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if ($size > 0xf0000000) {
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next if ($size > 0x10000000);
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next if $line !~ m/^($xs*)/;
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my $intro = "$addr $func [$file]:";
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my $padlen = 56 - length($intro);
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while ($padlen > 0) {
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next if ($size < 100);
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push @stack, "$intro$size\n";
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elsif (defined $dre && $line =~ m/$dre/) {
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my $size = "Dynamic ($1)";
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next if $line !~ m/^($xs*)/;
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my $intro = "$addr $func [$file]:";
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my $padlen = 56 - length($intro);
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while ($padlen > 0) {
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push @stack, "$intro$size\n";
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# Sort output by size (last field)
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print sort { ($b =~ /:\t*(\d+)$/)[0] <=> ($a =~ /:\t*(\d+)$/)[0] } @stack;
added
removed
tools/checkstack.pl
