| 1 | #!/usr/bin/perl
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| 2 |
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| 3 | # Stolen from Linux kernel :)
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| 4 |
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| 5 | # Check the stack usage of functions
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| 6 | #
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| 7 | # Copyright Joern Engel <joern@wh.fh-wedel.de>
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| 8 | # Inspired by Linus Torvalds
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| 9 | # Original idea maybe from Keith Owens
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| 10 | # s390 port and big speedup by Arnd Bergmann <arnd@bergmann-dalldorf.de>
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| 11 | # Mips port by Juan Quintela <quintela@mandrakesoft.com>
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| 12 | # IA64 port via Andreas Dilger
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| 13 | # Arm port by Holger Schurig
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| 14 | # sh64 port by Paul Mundt
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| 15 | # Random bits by Matt Mackall <mpm@selenic.com>
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| 16 | # M68k port by Geert Uytterhoeven and Andreas Schwab
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| 17 | #
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| 18 | # Usage:
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| 19 | # objdump -d vmlinux | checkstack.pl [arch]
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| 20 | #
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| 21 | # TODO : Port to all architectures (one regex per arch)
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| 22 |
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| 23 | # check for arch
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| 24 | #
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| 25 | # $re is used for two matches:
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| 26 | # $& (whole re) matches the complete objdump line with the stack growth
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| 27 | # $1 (first bracket) matches the size of the stack growth
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| 28 | #
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| 29 | # use anything else and feel the pain ;)
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| 30 | my (@stack, $re, $x, $xs);
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| 31 | {
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| 32 | my $arch = shift;
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| 33 | if ($arch eq "") {
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| 34 | $arch = `uname -m`;
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| 35 | }
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| 36 |
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| 37 | $x = "[0-9a-f]"; # hex character
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| 38 | $xs = "[0-9a-f ]"; # hex character or space
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| 39 | if ($arch eq 'arm') {
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| 40 | #c0008ffc: e24dd064 sub sp, sp, #100 ; 0x64
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| 41 | $re = qr/.*sub.*sp, sp, #(([0-9]{2}|[3-9])[0-9]{2})/o;
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| 42 | } elsif ($arch eq 'blackfin') {
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| 43 | # 52: 00 e8 03 00 LINK 0xc;
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| 44 | $re = qr/.*LINK (0x$x{1,5});$/o;
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| 45 | } elsif ($arch =~ /^i[3456]86$/) {
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| 46 | #c0105234: 81 ec ac 05 00 00 sub $0x5ac,%esp
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| 47 | $re = qr/^.*[as][du][db] \$(0x$x{1,8}),\%esp$/o;
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| 48 | } elsif ($arch eq 'x86_64') {
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| 49 | # 2f60: 48 81 ec e8 05 00 00 sub $0x5e8,%rsp
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| 50 | $re = qr/^.*[as][du][db] \$(0x$x{1,8}),\%rsp$/o;
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| 51 | } elsif ($arch eq 'ia64') {
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| 52 | #e0000000044011fc: 01 0f fc 8c adds r12=-384,r12
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| 53 | $re = qr/.*adds.*r12=-(([0-9]{2}|[3-9])[0-9]{2}),r12/o;
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| 54 | } elsif ($arch eq 'm68k') {
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| 55 | # 2b6c: 4e56 fb70 linkw %fp,#-1168
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| 56 | # 1df770: defc ffe4 addaw #-28,%sp
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| 57 | $re = qr/.*(?:linkw %fp,|addaw )#-([0-9]{1,4})(?:,%sp)?$/o;
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| 58 | } elsif ($arch eq 'mips64') {
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| 59 | #8800402c: 67bdfff0 daddiu sp,sp,-16
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| 60 | $re = qr/.*daddiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
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| 61 | } elsif ($arch eq 'mips') {
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| 62 | #88003254: 27bdffe0 addiu sp,sp,-32
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| 63 | $re = qr/.*addiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
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| 64 | } elsif ($arch eq 'ppc') {
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| 65 | #c00029f4: 94 21 ff 30 stwu r1,-208(r1)
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| 66 | $re = qr/.*stwu.*r1,-($x{1,8})\(r1\)/o;
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| 67 | } elsif ($arch eq 'ppc64') {
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| 68 | #XXX
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| 69 | $re = qr/.*stdu.*r1,-($x{1,8})\(r1\)/o;
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| 70 | } elsif ($arch eq 'powerpc') {
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| 71 | $re = qr/.*st[dw]u.*r1,-($x{1,8})\(r1\)/o;
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| 72 | } elsif ($arch =~ /^s390x?$/) {
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| 73 | # 11160: a7 fb ff 60 aghi %r15,-160
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| 74 | $re = qr/.*ag?hi.*\%r15,-(([0-9]{2}|[3-9])[0-9]{2})/o;
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| 75 | } elsif ($arch =~ /^sh64$/) {
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| 76 | #XXX: we only check for the immediate case presently,
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| 77 | # though we will want to check for the movi/sub
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| 78 | # pair for larger users. -- PFM.
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| 79 | #a00048e0: d4fc40f0 addi.l r15,-240,r15
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| 80 | $re = qr/.*addi\.l.*r15,-(([0-9]{2}|[3-9])[0-9]{2}),r15/o;
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| 81 | } else {
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| 82 | print("wrong or unknown architecture\n");
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| 83 | exit
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| 84 | }
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| 85 | }
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| 86 |
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| 87 | sub bysize($) {
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| 88 | my ($asize, $bsize);
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| 89 | ($asize = $a) =~ s/.*: *(.*)$/$1/;
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| 90 | ($bsize = $b) =~ s/.*: *(.*)$/$1/;
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| 91 | $bsize <=> $asize
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| 92 | }
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| 93 |
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| 94 | #
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| 95 | # main()
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| 96 | #
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| 97 | my $funcre = qr/^$x* <(.*)>:$/;
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| 98 | my $func;
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| 99 | my $file, $lastslash;
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| 100 |
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| 101 | while (my $line = <STDIN>) {
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| 102 | if ($line =~ m/$funcre/) {
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| 103 | $func = $1;
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| 104 | }
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| 105 | elsif ($line =~ m/(.*):\s*file format/) {
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| 106 | $file = $1;
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| 107 | $file =~ s/\.ko//;
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| 108 | $lastslash = rindex($file, "/");
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| 109 | if ($lastslash != -1) {
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| 110 | $file = substr($file, $lastslash + 1);
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| 111 | }
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| 112 | }
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| 113 | elsif ($line =~ m/$re/) {
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| 114 | my $size = $1;
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| 115 | $size = hex($size) if ($size =~ /^0x/);
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| 116 |
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| 117 | if ($size > 0xf0000000) {
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| 118 | $size = - $size;
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| 119 | $size += 0x80000000;
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| 120 | $size += 0x80000000;
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| 121 | }
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| 122 | next if ($size > 0x10000000);
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| 123 |
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| 124 | next if $line !~ m/^($xs*)/;
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| 125 | my $addr = $1;
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| 126 | $addr =~ s/ /0/g;
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| 127 | $addr = "0x$addr";
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| 128 |
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| 129 | # bbox: was: my $intro = "$addr $func [$file]:";
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| 130 | my $intro = "$func [$file]:";
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| 131 | my $padlen = 56 - length($intro);
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| 132 | while ($padlen > 0) {
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| 133 | $intro .= ' ';
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| 134 | $padlen -= 8;
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| 135 | }
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| 136 | next if ($size < 100);
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| 137 | push @stack, "$intro$size\n";
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| 138 | }
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| 139 | }
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| 140 |
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| 141 | print sort bysize @stack;
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