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66d25cbe29
For some unknown reason the regular expression for checkstack only matches
three digit numbers starting with the number "3", or any higher number.
Which means that it skips any stack sizes smaller than 304 bytes. This
makes the checkstack script a bit less useful than it could be.
Change the script to match any number. To be filtered out stack sizes can
be configured with the min_stack variable, which omits any stack frame
sizes smaller than 100 bytes by default.
This is similar with commit aab1f809d7 ("scripts/checkstack.pl: match
all stack sizes for s390").
Link: https://lkml.kernel.org/r/20231219125008.23007-4-yangtiezhu@loongson.cn
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
209 lines
6 KiB
Perl
Executable file
209 lines
6 KiB
Perl
Executable file
#!/usr/bin/env perl
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# SPDX-License-Identifier: GPL-2.0
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# Check the stack usage of functions
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#
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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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# Arm port by Holger Schurig
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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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# AArch64, PARISC ports by Kyle McMartin
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# sparc port by Martin Habets <errandir_news@mph.eclipse.co.uk>
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# ppc64le port by Breno Leitao <leitao@debian.org>
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# riscv port by Wadim Mueller <wafgo01@gmail.com>
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# loongarch port by Youling Tang <tangyouling@kylinos.cn>
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#
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# Usage:
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# objdump -d vmlinux | scripts/checkstack.pl [arch] [min_stack]
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#
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# TODO : Port to all architectures (one regex per arch)
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use strict;
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# check for arch
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#
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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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#
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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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#
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# $sub: subroutine for special handling to check stack usage.
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#
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# use anything else and feel the pain ;)
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my (@stack, $re, $dre, $sub, $x, $xs, $funcre, $min_stack);
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{
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my $arch = shift;
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if ($arch eq "") {
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$arch = `uname -m`;
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chomp($arch);
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}
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$min_stack = shift;
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if ($min_stack eq "" || $min_stack !~ /^\d+$/) {
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$min_stack = 100;
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}
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$x = "[0-9a-f]"; # hex character
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$xs = "[0-9a-f ]"; # hex character or space
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$funcre = qr/^$x* <(.*)>:$/;
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if ($arch =~ '^(aarch|arm)64$') {
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#ffffffc0006325cc: a9bb7bfd stp x29, x30, [sp, #-80]!
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#a110: d11643ff sub sp, sp, #0x590
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$re = qr/^.*stp.*sp, \#-([0-9]{1,8})\]\!/o;
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$dre = qr/^.*sub.*sp, sp, #(0x$x{1,8})/o;
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} elsif ($arch eq 'arm') {
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#c0008ffc: e24dd064 sub sp, sp, #100 ; 0x64
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$re = qr/.*sub.*sp, sp, #([0-9]{1,4})/o;
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$sub = \&arm_push_handling;
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} elsif ($arch =~ /^x86(_64)?$/ || $arch =~ /^i[3456]86$/) {
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#c0105234: 81 ec ac 05 00 00 sub $0x5ac,%esp
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# or
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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$x{1,8}),\%(e|r)sp$/o;
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$dre = qr/^.*[as][du][db] (%.*),\%(e|r)sp$/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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$re = qr/.*daddiu.*sp,sp,-([0-9]{1,8})/o;
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} elsif ($arch eq 'mips') {
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#88003254: 27bdffe0 addiu sp,sp,-32
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$re = qr/.*addiu.*sp,sp,-([0-9]{1,8})/o;
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} elsif ($arch eq 'nios2') {
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#25a8: defffb04 addi sp,sp,-20
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$re = qr/.*addi.*sp,sp,-([0-9]{1,8})/o;
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} elsif ($arch eq 'openrisc') {
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# c000043c: 9c 21 fe f0 l.addi r1,r1,-272
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$re = qr/.*l\.addi.*r1,r1,-([0-9]{1,8})/o;
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} elsif ($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 'powerpc' || $arch =~ /^ppc(64)?(le)?$/ ) {
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# powerpc : 94 21 ff 30 stwu r1,-208(r1)
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# ppc64(le) : 81 ff 21 f8 stdu r1,-128(r1)
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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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# or
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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]+)(?:\(\%r15\))?$/o;
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} elsif ($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]{1,8}), %sp/o;
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} elsif ($arch =~ /^riscv(64)?$/) {
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#ffffffff8036e868: c2010113 addi sp,sp,-992
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$re = qr/.*addi.*sp,sp,-([0-9]{1,8})/o;
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} elsif ($arch =~ /^loongarch(32|64)?$/) {
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#9000000000224708: 02ff4063 addi.d $sp, $sp, -48(0xfd0)
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$re = qr/.*addi\..*sp, .*sp, -([0-9]{1,8}).*/o;
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} else {
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print("wrong or unknown architecture \"$arch\"\n");
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exit
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}
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}
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#
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# To count stack usage of push {*, fp, ip, lr, pc} instruction in ARM,
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# if FRAME POINTER is enabled.
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# e.g. c01f0d48: e92ddff0 push {r4, r5, r6, r7, r8, r9, sl, fp, ip, lr, pc}
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#
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sub arm_push_handling {
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my $regex = qr/.*push.*fp, ip, lr, pc}/o;
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my $size = 0;
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my $line_arg = shift;
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if ($line_arg =~ m/$regex/) {
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$size = $line_arg =~ tr/,//;
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$size = ($size + 1) * 4;
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}
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return $size;
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}
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#
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# main()
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#
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my ($func, $file, $lastslash, $total_size, $addr, $intro);
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$total_size = 0;
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while (my $line = <STDIN>) {
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if ($line =~ m/$funcre/) {
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$func = $1;
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next if $line !~ m/^($x*)/;
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if ($total_size > $min_stack) {
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push @stack, "$intro$total_size\n";
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}
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$addr = "0x$1";
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$intro = "$addr $func [$file]:";
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my $padlen = 56 - length($intro);
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while ($padlen > 0) {
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$intro .= ' ';
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$padlen -= 8;
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}
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$total_size = 0;
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}
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elsif ($line =~ m/(.*):\s*file format/) {
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$file = $1;
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$file =~ s/\.ko//;
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$lastslash = rindex($file, "/");
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if ($lastslash != -1) {
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$file = substr($file, $lastslash + 1);
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}
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}
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elsif ($line =~ m/$re/) {
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my $size = $1;
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$size = hex($size) if ($size =~ /^0x/);
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if ($size > 0xf0000000) {
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$size = - $size;
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$size += 0x80000000;
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$size += 0x80000000;
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}
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next if ($size > 0x10000000);
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$total_size += $size;
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}
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elsif (defined $dre && $line =~ m/$dre/) {
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my $size = $1;
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$size = hex($size) if ($size =~ /^0x/);
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$total_size += $size;
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}
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elsif (defined $sub) {
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my $size = &$sub($line);
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$total_size += $size;
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}
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}
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if ($total_size > $min_stack) {
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push @stack, "$intro$total_size\n";
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}
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# Sort output by size (last field) and function name if size is the same
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sub sort_lines {
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my ($a, $b) = @_;
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my $num_a = $1 if $a =~ /:\t*(\d+)$/;
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my $num_b = $1 if $b =~ /:\t*(\d+)$/;
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my $func_a = $1 if $a =~ / (.*):/;
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my $func_b = $1 if $b =~ / (.*):/;
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if ($num_a != $num_b) {
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return $num_b <=> $num_a;
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} else {
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return $func_a cmp $func_b;
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}
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}
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print sort { sort_lines($a, $b) } @stack;
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