projects/linux·blob v2.6.15-rc4 · refs

123 lines · 3.5 KiB

1#!/usr/bin/perl
2
3# Check the stack usage of functions
4#
5# Copyright Joern Engel <[email protected]>
6# Inspired by Linus Torvalds
7# Original idea maybe from Keith Owens
8# s390 port and big speedup by Arnd Bergmann <[email protected]>
9# Mips port by Juan Quintela <[email protected]>
10# IA64 port via Andreas Dilger
11# Arm port by Holger Schurig
12# sh64 port by Paul Mundt
13# Random bits by Matt Mackall <[email protected]>
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 ;)
28my (@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;
65 } elsif ($arch =~ /^s390x?$/) {
66 # 11160: a7 fb ff 60 aghi %r15,-160
67 $re = qr/.*ag?hi.*\%r15,-(([0-9]{2}|[3-9])[0-9]{2})/o;
68 } elsif ($arch =~ /^sh64$/) {
69 #XXX: we only check for the immediate case presently,
70 # though we will want to check for the movi/sub
71 # pair for larger users. -- PFM.
72 #a00048e0: d4fc40f0 addi.l r15,-240,r15
73 $re = qr/.*addi\.l.*r15,-(([0-9]{2}|[3-9])[0-9]{2}),r15/o;
74 } else {
75 print("wrong or unknown architecture\n");
76 exit
77 }
78}
79
80sub bysize($) {
81 my ($asize, $bsize);
82 ($asize = $a) =~ s/.*: *(.*)$/$1/;
83 ($bsize = $b) =~ s/.*: *(.*)$/$1/;
84 $bsize <=> $asize
85}
86
87#
88# main()
89#
90my $funcre = qr/^$x* <(.*)>:$/;
91my $func;
92while (my $line = <STDIN>) {
93 if ($line =~ m/$funcre/) {
94 $func = $1;
95 }
96 if ($line =~ m/$re/) {
97 my $size = $1;
98 $size = hex($size) if ($size =~ /^0x/);
99
100 if ($size > 0xf0000000) {
101 $size = - $size;
102 $size += 0x80000000;
103 $size += 0x80000000;
104 }
105 next if ($size > 0x10000000);
106
107 next if $line !~ m/^($xs*)/;
108 my $addr = $1;
109 $addr =~ s/ /0/g;
110 $addr = "0x$addr";
111
112 my $intro = "$addr $func:";
113 my $padlen = 56 - length($intro);
114 while ($padlen > 0) {
115 $intro .= ' ';
116 $padlen -= 8;
117 }
118 next if ($size < 100);
119 push @stack, "$intro$size\n";
120 }
121}
122
123print sort bysize @stack;