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cb77f0d6 | 1 | #!/usr/bin/env perl |
b2441318 | 2 | # SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
3 | |
4 | # Check the stack usage of functions | |
5 | # | |
2b54aaef | 6 | # Copyright Joern Engel <joern@lazybastard.org> |
1da177e4 LT |
7 | # Inspired by Linus Torvalds |
8 | # Original idea maybe from Keith Owens | |
9 | # s390 port and big speedup by Arnd Bergmann <arnd@bergmann-dalldorf.de> | |
10 | # Mips port by Juan Quintela <quintela@mandrakesoft.com> | |
11 | # IA64 port via Andreas Dilger | |
12 | # Arm port by Holger Schurig | |
1da177e4 LT |
13 | # Random bits by Matt Mackall <mpm@selenic.com> |
14 | # M68k port by Geert Uytterhoeven and Andreas Schwab | |
208ad001 | 15 | # AArch64, PARISC ports by Kyle McMartin |
d41e2d73 | 16 | # sparc port by Martin Habets <errandir_news@mph.eclipse.co.uk> |
8449a4cb | 17 | # ppc64le port by Breno Leitao <leitao@debian.org> |
1fd49a0b | 18 | # riscv port by Wadim Mueller <wafgo01@gmail.com> |
1da177e4 LT |
19 | # |
20 | # Usage: | |
477116e6 | 21 | # objdump -d vmlinux | scripts/checkstack.pl [arch] |
1da177e4 LT |
22 | # |
23 | # TODO : Port to all architectures (one regex per arch) | |
24 | ||
1f2a144f SH |
25 | use strict; |
26 | ||
1da177e4 LT |
27 | # check for arch |
28 | # | |
29 | # $re is used for two matches: | |
30 | # $& (whole re) matches the complete objdump line with the stack growth | |
31 | # $1 (first bracket) matches the size of the stack growth | |
32 | # | |
585e93ae ES |
33 | # $dre is similar, but for dynamic stack redutions: |
34 | # $& (whole re) matches the complete objdump line with the stack growth | |
35 | # $1 (first bracket) matches the dynamic amount of the stack growth | |
36 | # | |
3311eeeb MS |
37 | # $sub: subroutine for special handling to check stack usage. |
38 | # | |
1da177e4 | 39 | # use anything else and feel the pain ;) |
3311eeeb | 40 | my (@stack, $re, $dre, $sub, $x, $xs, $funcre, $min_stack); |
1da177e4 LT |
41 | { |
42 | my $arch = shift; | |
43 | if ($arch eq "") { | |
44 | $arch = `uname -m`; | |
abddaec5 | 45 | chomp($arch); |
1da177e4 LT |
46 | } |
47 | ||
572220aa MS |
48 | $min_stack = shift; |
49 | if ($min_stack eq "" || $min_stack !~ /^\d+$/) { | |
50 | $min_stack = 100; | |
51 | } | |
52 | ||
1da177e4 LT |
53 | $x = "[0-9a-f]"; # hex character |
54 | $xs = "[0-9a-f ]"; # hex character or space | |
690998b6 | 55 | $funcre = qr/^$x* <(.*)>:$/; |
4f45d62a | 56 | if ($arch =~ '^(aarch|arm)64$') { |
f1733a1d | 57 | #ffffffc0006325cc: a9bb7bfd stp x29, x30, [sp, #-80]! |
919e9d39 | 58 | #a110: d11643ff sub sp, sp, #0x590 |
f1733a1d | 59 | $re = qr/^.*stp.*sp, \#-([0-9]{1,8})\]\!/o; |
919e9d39 | 60 | $dre = qr/^.*sub.*sp, sp, #(0x$x{1,8})/o; |
208ad001 | 61 | } elsif ($arch eq 'arm') { |
1da177e4 | 62 | #c0008ffc: e24dd064 sub sp, sp, #100 ; 0x64 |
6ce16f2b | 63 | $re = qr/.*sub.*sp, sp, #([0-9]{1,4})/o; |
3311eeeb | 64 | $sub = \&arm_push_handling; |
fda9f990 | 65 | } elsif ($arch =~ /^x86(_64)?$/ || $arch =~ /^i[3456]86$/) { |
1da177e4 | 66 | #c0105234: 81 ec ac 05 00 00 sub $0x5ac,%esp |
fda9f990 KK |
67 | # or |
68 | # 2f60: 48 81 ec e8 05 00 00 sub $0x5e8,%rsp | |
69 | $re = qr/^.*[as][du][db] \$(0x$x{1,8}),\%(e|r)sp$/o; | |
70 | $dre = qr/^.*[as][du][db] (%.*),\%(e|r)sp$/o; | |
1da177e4 LT |
71 | } elsif ($arch eq 'ia64') { |
72 | #e0000000044011fc: 01 0f fc 8c adds r12=-384,r12 | |
73 | $re = qr/.*adds.*r12=-(([0-9]{2}|[3-9])[0-9]{2}),r12/o; | |
74 | } elsif ($arch eq 'm68k') { | |
75 | # 2b6c: 4e56 fb70 linkw %fp,#-1168 | |
76 | # 1df770: defc ffe4 addaw #-28,%sp | |
77 | $re = qr/.*(?:linkw %fp,|addaw )#-([0-9]{1,4})(?:,%sp)?$/o; | |
78 | } elsif ($arch eq 'mips64') { | |
79 | #8800402c: 67bdfff0 daddiu sp,sp,-16 | |
80 | $re = qr/.*daddiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o; | |
81 | } elsif ($arch eq 'mips') { | |
82 | #88003254: 27bdffe0 addiu sp,sp,-32 | |
83 | $re = qr/.*addiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o; | |
0e5a47a8 TK |
84 | } elsif ($arch eq 'nios2') { |
85 | #25a8: defffb04 addi sp,sp,-20 | |
86 | $re = qr/.*addi.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o; | |
f72deab3 SH |
87 | } elsif ($arch eq 'openrisc') { |
88 | # c000043c: 9c 21 fe f0 l.addi r1,r1,-272 | |
89 | $re = qr/.*l\.addi.*r1,r1,-(([0-9]{2}|[3-9])[0-9]{2})/o; | |
562d139c KM |
90 | } elsif ($arch eq 'parisc' || $arch eq 'parisc64') { |
91 | $re = qr/.*ldo ($x{1,8})\(sp\),sp/o; | |
8449a4cb BL |
92 | } elsif ($arch eq 'powerpc' || $arch =~ /^ppc(64)?(le)?$/ ) { |
93 | # powerpc : 94 21 ff 30 stwu r1,-208(r1) | |
94 | # ppc64(le) : 81 ff 21 f8 stdu r1,-128(r1) | |
271c511d | 95 | $re = qr/.*st[dw]u.*r1,-($x{1,8})\(r1\)/o; |
1da177e4 LT |
96 | } elsif ($arch =~ /^s390x?$/) { |
97 | # 11160: a7 fb ff 60 aghi %r15,-160 | |
89d49841 CB |
98 | # or |
99 | # 100092: e3 f0 ff c8 ff 71 lay %r15,-56(%r15) | |
aab1f809 | 100 | $re = qr/.*(?:lay|ag?hi).*\%r15,-([0-9]+)(?:\(\%r15\))?$/o; |
d41e2d73 MH |
101 | } elsif ($arch eq 'sparc' || $arch eq 'sparc64') { |
102 | # f0019d10: 9d e3 bf 90 save %sp, -112, %sp | |
103 | $re = qr/.*save.*%sp, -(([0-9]{2}|[3-9])[0-9]{2}), %sp/o; | |
1fd49a0b WM |
104 | } elsif ($arch =~ /^riscv(64)?$/) { |
105 | #ffffffff8036e868: c2010113 addi sp,sp,-992 | |
106 | $re = qr/.*addi.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o; | |
1da177e4 | 107 | } else { |
abddaec5 | 108 | print("wrong or unknown architecture \"$arch\"\n"); |
1da177e4 LT |
109 | exit |
110 | } | |
111 | } | |
112 | ||
3311eeeb MS |
113 | # |
114 | # To count stack usage of push {*, fp, ip, lr, pc} instruction in ARM, | |
115 | # if FRAME POINTER is enabled. | |
116 | # e.g. c01f0d48: e92ddff0 push {r4, r5, r6, r7, r8, r9, sl, fp, ip, lr, pc} | |
117 | # | |
118 | sub arm_push_handling { | |
119 | my $regex = qr/.*push.*fp, ip, lr, pc}/o; | |
120 | my $size = 0; | |
121 | my $line_arg = shift; | |
122 | ||
123 | if ($line_arg =~ m/$regex/) { | |
124 | $size = $line_arg =~ tr/,//; | |
125 | $size = ($size + 1) * 4; | |
126 | } | |
127 | ||
128 | return $size; | |
129 | } | |
130 | ||
1da177e4 LT |
131 | # |
132 | # main() | |
133 | # | |
677f1410 MS |
134 | my ($func, $file, $lastslash, $total_size, $addr, $intro); |
135 | ||
136 | $total_size = 0; | |
8ad2914d | 137 | |
1da177e4 LT |
138 | while (my $line = <STDIN>) { |
139 | if ($line =~ m/$funcre/) { | |
140 | $func = $1; | |
ee34db3f | 141 | next if $line !~ m/^($x*)/; |
572220aa | 142 | if ($total_size > $min_stack) { |
677f1410 MS |
143 | push @stack, "$intro$total_size\n"; |
144 | } | |
ee34db3f | 145 | $addr = "0x$1"; |
677f1410 MS |
146 | $intro = "$addr $func [$file]:"; |
147 | my $padlen = 56 - length($intro); | |
148 | while ($padlen > 0) { | |
149 | $intro .= ' '; | |
150 | $padlen -= 8; | |
151 | } | |
152 | ||
153 | $total_size = 0; | |
1da177e4 | 154 | } |
8ad2914d RD |
155 | elsif ($line =~ m/(.*):\s*file format/) { |
156 | $file = $1; | |
157 | $file =~ s/\.ko//; | |
158 | $lastslash = rindex($file, "/"); | |
159 | if ($lastslash != -1) { | |
160 | $file = substr($file, $lastslash + 1); | |
161 | } | |
162 | } | |
163 | elsif ($line =~ m/$re/) { | |
1da177e4 LT |
164 | my $size = $1; |
165 | $size = hex($size) if ($size =~ /^0x/); | |
166 | ||
167 | if ($size > 0xf0000000) { | |
168 | $size = - $size; | |
169 | $size += 0x80000000; | |
170 | $size += 0x80000000; | |
171 | } | |
172 | next if ($size > 0x10000000); | |
173 | ||
677f1410 | 174 | $total_size += $size; |
1da177e4 | 175 | } |
585e93ae | 176 | elsif (defined $dre && $line =~ m/$dre/) { |
677f1410 | 177 | my $size = $1; |
585e93ae | 178 | |
677f1410 MS |
179 | $size = hex($size) if ($size =~ /^0x/); |
180 | $total_size += $size; | |
585e93ae | 181 | } |
3311eeeb MS |
182 | elsif (defined $sub) { |
183 | my $size = &$sub($line); | |
184 | ||
185 | $total_size += $size; | |
186 | } | |
1da177e4 | 187 | } |
572220aa | 188 | if ($total_size > $min_stack) { |
677f1410 MS |
189 | push @stack, "$intro$total_size\n"; |
190 | } | |
1da177e4 | 191 | |
1f2a144f SH |
192 | # Sort output by size (last field) |
193 | print sort { ($b =~ /:\t*(\d+)$/)[0] <=> ($a =~ /:\t*(\d+)$/)[0] } @stack; |