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When running `make LLVM=1 checkstack`, OBJDUMP is set to llvm-objdump. llvm-objdump outputs disassembly with instruction size suffixes (such as subq/addq/subl/addl), tabs/whitespace differences, spaces after commas, and trailing comments (e.g. `# imm = 0x...`). Because scripts/checkstack.pl used rigid regular expressions specifically tuned to GNU objdump format (e.g. requiring exactly four spaces, no suffix, and no space after comma), checkstack.pl failed to match any stack adjustment instructions and yielded no output when using llvm-objdump on x86. Update the regular expressions for x86 to match optional suffixes, variable whitespace, and trailing comments. Link: https://lore.kernel.org/20260902-checkstack_llvm_objdump-v1-1-edb4eca5f163@google.com Signed-off-by: Nick Desaulniers <ndesaulniers@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Assisted-by: LLM Gemini Cc: Bill Wendling <morbo@google.com> Cc: Justin Stitt <justinstitt@google.com> Cc: Nathan Chancellor <nathan@kernel.org>
211 lines
6.0 KiB
Perl
Executable File
211 lines
6.0 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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$min_stack = 512;
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}
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$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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# or
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# 0: 48 81 ec e8 05 00 00 subq $0x5e8, %rsp
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$re = qr/^.*[as][du][db][ql]?\s+\$(0x$x{1,8}),\s*\%(e|r)sp/o;
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$dre = qr/^.*[as][du][db][ql]?\s+(%.*),\s*\%(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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