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919e9d39e7
This is to track dynamic amount of stack growth for aarch64, so it is possible to print out offensive functions that may consume too much stack. For example, 0xffff2000084d1270 try_to_unmap_one [vmlinux]: Dynamic (0xcf0) 0xffff200008538358 migrate_page_move_mapping [vmlinux]: Dynamic (0xc60) 0xffff2000081276c8 copy_process.isra.2 [vmlinux]: Dynamic (0xb20) 0xffff200008424958 show_free_areas [vmlinux]: Dynamic (0xb40) 0xffff200008545178 __split_huge_pmd_locked [vmlinux]: Dynamic (0xb30) 0xffff200008555120 collapse_shmem [vmlinux]: Dynamic (0xbc0) 0xffff20000862e0d0 do_direct_IO [vmlinux]: Dynamic (0xb70) 0xffff200008cc0aa0 md_do_sync [vmlinux]: Dynamic (0xb90) Link: http://lkml.kernel.org/r/20181208025143.39363-1-cai@lca.pw Signed-off-by: Qian Cai <cai@lca.pw> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
171 lines
5.3 KiB
Perl
Executable File
171 lines
5.3 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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# IA64 port via Andreas Dilger
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# Arm port by Holger Schurig
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# sh64 port by Paul Mundt
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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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#
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# Usage:
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# objdump -d vmlinux | scripts/checkstack.pl [arch]
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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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# use anything else and feel the pain ;)
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my (@stack, $re, $dre, $x, $xs, $funcre);
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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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$x = "[0-9a-f]"; # hex character
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$xs = "[0-9a-f ]"; # hex character or space
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$funcre = qr/^$x* <(.*)>:$/;
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if ($arch eq 'aarch64') {
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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]{2}|[3-9])[0-9]{2})/o;
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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 ($arch eq 'ia64') {
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#e0000000044011fc: 01 0f fc 8c adds r12=-384,r12
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$re = qr/.*adds.*r12=-(([0-9]{2}|[3-9])[0-9]{2}),r12/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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$re = qr/.*daddiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
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} elsif ($arch eq 'mips') {
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#88003254: 27bdffe0 addiu sp,sp,-32
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$re = qr/.*addiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
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} elsif ($arch eq 'nios2') {
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#25a8: defffb04 addi sp,sp,-20
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$re = qr/.*addi.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
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} elsif ($arch eq 'openrisc') {
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# c000043c: 9c 21 fe f0 l.addi r1,r1,-272
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$re = qr/.*l\.addi.*r1,r1,-(([0-9]{2}|[3-9])[0-9]{2})/o;
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} elsif ($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]{2}|[3-9])[0-9]{2})
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(?:\(\%r15\))?$/ox;
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} elsif ($arch =~ /^sh64$/) {
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#XXX: we only check for the immediate case presently,
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# though we will want to check for the movi/sub
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# pair for larger users. -- PFM.
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#a00048e0: d4fc40f0 addi.l r15,-240,r15
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$re = qr/.*addi\.l.*r15,-(([0-9]{2}|[3-9])[0-9]{2}),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]{2}|[3-9])[0-9]{2}), %sp/o;
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} else {
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print("wrong or unknown architecture \"$arch\"\n");
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exit
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}
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}
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#
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# main()
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#
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my ($func, $file, $lastslash);
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while (my $line = <STDIN>) {
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if ($line =~ m/$funcre/) {
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$func = $1;
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}
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elsif ($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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next if $line !~ m/^($xs*)/;
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my $addr = $1;
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$addr =~ s/ /0/g;
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$addr = "0x$addr";
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my $intro = "$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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$padlen -= 8;
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}
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next if ($size < 100);
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push @stack, "$intro$size\n";
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}
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elsif (defined $dre && $line =~ m/$dre/) {
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my $size = "Dynamic ($1)";
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next if $line !~ m/^($xs*)/;
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my $addr = $1;
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$addr =~ s/ /0/g;
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$addr = "0x$addr";
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my $intro = "$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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$padlen -= 8;
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}
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push @stack, "$intro$size\n";
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}
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}
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# Sort output by size (last field)
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print sort { ($b =~ /:\t*(\d+)$/)[0] <=> ($a =~ /:\t*(\d+)$/)[0] } @stack;
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