Commit | Line | Data |
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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 | |
13 | # sh64 port by Paul Mundt | |
14 | # Random bits by Matt Mackall <mpm@selenic.com> | |
15 | # M68k port by Geert Uytterhoeven and Andreas Schwab | |
208ad001 | 16 | # AArch64, PARISC ports by Kyle McMartin |
d41e2d73 | 17 | # sparc port by Martin Habets <errandir_news@mph.eclipse.co.uk> |
8449a4cb | 18 | # ppc64le port by Breno Leitao <leitao@debian.org> |
1fd49a0b | 19 | # riscv port by Wadim Mueller <wafgo01@gmail.com> |
1da177e4 LT |
20 | # |
21 | # Usage: | |
477116e6 | 22 | # objdump -d vmlinux | scripts/checkstack.pl [arch] |
1da177e4 LT |
23 | # |
24 | # TODO : Port to all architectures (one regex per arch) | |
25 | ||
1f2a144f SH |
26 | use strict; |
27 | ||
1da177e4 LT |
28 | # check for arch |
29 | # | |
30 | # $re is used for two matches: | |
31 | # $& (whole re) matches the complete objdump line with the stack growth | |
32 | # $1 (first bracket) matches the size of the stack growth | |
33 | # | |
585e93ae ES |
34 | # $dre is similar, but for dynamic stack redutions: |
35 | # $& (whole re) matches the complete objdump line with the stack growth | |
36 | # $1 (first bracket) matches the dynamic amount of the stack growth | |
37 | # | |
3311eeeb MS |
38 | # $sub: subroutine for special handling to check stack usage. |
39 | # | |
1da177e4 | 40 | # use anything else and feel the pain ;) |
3311eeeb | 41 | my (@stack, $re, $dre, $sub, $x, $xs, $funcre, $min_stack); |
1da177e4 LT |
42 | { |
43 | my $arch = shift; | |
44 | if ($arch eq "") { | |
45 | $arch = `uname -m`; | |
abddaec5 | 46 | chomp($arch); |
1da177e4 LT |
47 | } |
48 | ||
572220aa MS |
49 | $min_stack = shift; |
50 | if ($min_stack eq "" || $min_stack !~ /^\d+$/) { | |
51 | $min_stack = 100; | |
52 | } | |
53 | ||
1da177e4 LT |
54 | $x = "[0-9a-f]"; # hex character |
55 | $xs = "[0-9a-f ]"; # hex character or space | |
690998b6 | 56 | $funcre = qr/^$x* <(.*)>:$/; |
4f45d62a | 57 | if ($arch =~ '^(aarch|arm)64$') { |
f1733a1d | 58 | #ffffffc0006325cc: a9bb7bfd stp x29, x30, [sp, #-80]! |
919e9d39 | 59 | #a110: d11643ff sub sp, sp, #0x590 |
f1733a1d | 60 | $re = qr/^.*stp.*sp, \#-([0-9]{1,8})\]\!/o; |
919e9d39 | 61 | $dre = qr/^.*sub.*sp, sp, #(0x$x{1,8})/o; |
208ad001 | 62 | } elsif ($arch eq 'arm') { |
1da177e4 | 63 | #c0008ffc: e24dd064 sub sp, sp, #100 ; 0x64 |
6ce16f2b | 64 | $re = qr/.*sub.*sp, sp, #([0-9]{1,4})/o; |
3311eeeb | 65 | $sub = \&arm_push_handling; |
fda9f990 | 66 | } elsif ($arch =~ /^x86(_64)?$/ || $arch =~ /^i[3456]86$/) { |
1da177e4 | 67 | #c0105234: 81 ec ac 05 00 00 sub $0x5ac,%esp |
fda9f990 KK |
68 | # or |
69 | # 2f60: 48 81 ec e8 05 00 00 sub $0x5e8,%rsp | |
70 | $re = qr/^.*[as][du][db] \$(0x$x{1,8}),\%(e|r)sp$/o; | |
71 | $dre = qr/^.*[as][du][db] (%.*),\%(e|r)sp$/o; | |
1da177e4 LT |
72 | } elsif ($arch eq 'ia64') { |
73 | #e0000000044011fc: 01 0f fc 8c adds r12=-384,r12 | |
74 | $re = qr/.*adds.*r12=-(([0-9]{2}|[3-9])[0-9]{2}),r12/o; | |
75 | } elsif ($arch eq 'm68k') { | |
76 | # 2b6c: 4e56 fb70 linkw %fp,#-1168 | |
77 | # 1df770: defc ffe4 addaw #-28,%sp | |
78 | $re = qr/.*(?:linkw %fp,|addaw )#-([0-9]{1,4})(?:,%sp)?$/o; | |
79 | } elsif ($arch eq 'mips64') { | |
80 | #8800402c: 67bdfff0 daddiu sp,sp,-16 | |
81 | $re = qr/.*daddiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o; | |
82 | } elsif ($arch eq 'mips') { | |
83 | #88003254: 27bdffe0 addiu sp,sp,-32 | |
84 | $re = qr/.*addiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o; | |
0e5a47a8 TK |
85 | } elsif ($arch eq 'nios2') { |
86 | #25a8: defffb04 addi sp,sp,-20 | |
87 | $re = qr/.*addi.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o; | |
f72deab3 SH |
88 | } elsif ($arch eq 'openrisc') { |
89 | # c000043c: 9c 21 fe f0 l.addi r1,r1,-272 | |
90 | $re = qr/.*l\.addi.*r1,r1,-(([0-9]{2}|[3-9])[0-9]{2})/o; | |
562d139c KM |
91 | } elsif ($arch eq 'parisc' || $arch eq 'parisc64') { |
92 | $re = qr/.*ldo ($x{1,8})\(sp\),sp/o; | |
8449a4cb BL |
93 | } elsif ($arch eq 'powerpc' || $arch =~ /^ppc(64)?(le)?$/ ) { |
94 | # powerpc : 94 21 ff 30 stwu r1,-208(r1) | |
95 | # ppc64(le) : 81 ff 21 f8 stdu r1,-128(r1) | |
271c511d | 96 | $re = qr/.*st[dw]u.*r1,-($x{1,8})\(r1\)/o; |
1da177e4 LT |
97 | } elsif ($arch =~ /^s390x?$/) { |
98 | # 11160: a7 fb ff 60 aghi %r15,-160 | |
89d49841 CB |
99 | # or |
100 | # 100092: e3 f0 ff c8 ff 71 lay %r15,-56(%r15) | |
101 | $re = qr/.*(?:lay|ag?hi).*\%r15,-(([0-9]{2}|[3-9])[0-9]{2}) | |
102 | (?:\(\%r15\))?$/ox; | |
1da177e4 LT |
103 | } elsif ($arch =~ /^sh64$/) { |
104 | #XXX: we only check for the immediate case presently, | |
105 | # though we will want to check for the movi/sub | |
106 | # pair for larger users. -- PFM. | |
107 | #a00048e0: d4fc40f0 addi.l r15,-240,r15 | |
108 | $re = qr/.*addi\.l.*r15,-(([0-9]{2}|[3-9])[0-9]{2}),r15/o; | |
d41e2d73 MH |
109 | } elsif ($arch eq 'sparc' || $arch eq 'sparc64') { |
110 | # f0019d10: 9d e3 bf 90 save %sp, -112, %sp | |
111 | $re = qr/.*save.*%sp, -(([0-9]{2}|[3-9])[0-9]{2}), %sp/o; | |
1fd49a0b WM |
112 | } elsif ($arch =~ /^riscv(64)?$/) { |
113 | #ffffffff8036e868: c2010113 addi sp,sp,-992 | |
114 | $re = qr/.*addi.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o; | |
1da177e4 | 115 | } else { |
abddaec5 | 116 | print("wrong or unknown architecture \"$arch\"\n"); |
1da177e4 LT |
117 | exit |
118 | } | |
119 | } | |
120 | ||
3311eeeb MS |
121 | # |
122 | # To count stack usage of push {*, fp, ip, lr, pc} instruction in ARM, | |
123 | # if FRAME POINTER is enabled. | |
124 | # e.g. c01f0d48: e92ddff0 push {r4, r5, r6, r7, r8, r9, sl, fp, ip, lr, pc} | |
125 | # | |
126 | sub arm_push_handling { | |
127 | my $regex = qr/.*push.*fp, ip, lr, pc}/o; | |
128 | my $size = 0; | |
129 | my $line_arg = shift; | |
130 | ||
131 | if ($line_arg =~ m/$regex/) { | |
132 | $size = $line_arg =~ tr/,//; | |
133 | $size = ($size + 1) * 4; | |
134 | } | |
135 | ||
136 | return $size; | |
137 | } | |
138 | ||
1da177e4 LT |
139 | # |
140 | # main() | |
141 | # | |
677f1410 MS |
142 | my ($func, $file, $lastslash, $total_size, $addr, $intro); |
143 | ||
144 | $total_size = 0; | |
8ad2914d | 145 | |
1da177e4 LT |
146 | while (my $line = <STDIN>) { |
147 | if ($line =~ m/$funcre/) { | |
148 | $func = $1; | |
677f1410 | 149 | next if $line !~ m/^($xs*)/; |
572220aa | 150 | if ($total_size > $min_stack) { |
677f1410 MS |
151 | push @stack, "$intro$total_size\n"; |
152 | } | |
153 | ||
154 | $addr = $1; | |
155 | $addr =~ s/ /0/g; | |
156 | $addr = "0x$addr"; | |
157 | ||
158 | $intro = "$addr $func [$file]:"; | |
159 | my $padlen = 56 - length($intro); | |
160 | while ($padlen > 0) { | |
161 | $intro .= ' '; | |
162 | $padlen -= 8; | |
163 | } | |
164 | ||
165 | $total_size = 0; | |
1da177e4 | 166 | } |
8ad2914d RD |
167 | elsif ($line =~ m/(.*):\s*file format/) { |
168 | $file = $1; | |
169 | $file =~ s/\.ko//; | |
170 | $lastslash = rindex($file, "/"); | |
171 | if ($lastslash != -1) { | |
172 | $file = substr($file, $lastslash + 1); | |
173 | } | |
174 | } | |
175 | elsif ($line =~ m/$re/) { | |
1da177e4 LT |
176 | my $size = $1; |
177 | $size = hex($size) if ($size =~ /^0x/); | |
178 | ||
179 | if ($size > 0xf0000000) { | |
180 | $size = - $size; | |
181 | $size += 0x80000000; | |
182 | $size += 0x80000000; | |
183 | } | |
184 | next if ($size > 0x10000000); | |
185 | ||
677f1410 | 186 | $total_size += $size; |
1da177e4 | 187 | } |
585e93ae | 188 | elsif (defined $dre && $line =~ m/$dre/) { |
677f1410 | 189 | my $size = $1; |
585e93ae | 190 | |
677f1410 MS |
191 | $size = hex($size) if ($size =~ /^0x/); |
192 | $total_size += $size; | |
585e93ae | 193 | } |
3311eeeb MS |
194 | elsif (defined $sub) { |
195 | my $size = &$sub($line); | |
196 | ||
197 | $total_size += $size; | |
198 | } | |
1da177e4 | 199 | } |
572220aa | 200 | if ($total_size > $min_stack) { |
677f1410 MS |
201 | push @stack, "$intro$total_size\n"; |
202 | } | |
1da177e4 | 203 | |
1f2a144f SH |
204 | # Sort output by size (last field) |
205 | print sort { ($b =~ /:\t*(\d+)$/)[0] <=> ($a =~ /:\t*(\d+)$/)[0] } @stack; |