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Code Editor : checkstack.pl
#!/usr/bin/env perl # SPDX-License-Identifier: GPL-2.0 # Check the stack usage of functions # # Copyright Joern Engel <joern@lazybastard.org> # Inspired by Linus Torvalds # Original idea maybe from Keith Owens # s390 port and big speedup by Arnd Bergmann <arnd@bergmann-dalldorf.de> # Mips port by Juan Quintela <quintela@mandrakesoft.com> # IA64 port via Andreas Dilger # Arm port by Holger Schurig # sh64 port by Paul Mundt # Random bits by Matt Mackall <mpm@selenic.com> # M68k port by Geert Uytterhoeven and Andreas Schwab # AArch64, PARISC ports by Kyle McMartin # sparc port by Martin Habets <errandir_news@mph.eclipse.co.uk> # ppc64le port by Breno Leitao <leitao@debian.org> # # Usage: # objdump -d vmlinux | scripts/checkstack.pl [arch] # # TODO : Port to all architectures (one regex per arch) use strict; # check for arch # # $re is used for two matches: # $& (whole re) matches the complete objdump line with the stack growth # $1 (first bracket) matches the size of the stack growth # # $dre is similar, but for dynamic stack redutions: # $& (whole re) matches the complete objdump line with the stack growth # $1 (first bracket) matches the dynamic amount of the stack growth # # $sub: subroutine for special handling to check stack usage. # # use anything else and feel the pain ;) my (@stack, $re, $dre, $sub, $x, $xs, $funcre, $min_stack); { my $arch = shift; if ($arch eq "") { $arch = `uname -m`; chomp($arch); } $min_stack = shift; if ($min_stack eq "" || $min_stack !~ /^\d+$/) { $min_stack = 100; } $x = "[0-9a-f]"; # hex character $xs = "[0-9a-f ]"; # hex character or space $funcre = qr/^$x* <(.*)>:$/; if ($arch =~ '^(aarch|arm)64$') { #ffffffc0006325cc: a9bb7bfd stp x29, x30, [sp, #-80]! #a110: d11643ff sub sp, sp, #0x590 $re = qr/^.*stp.*sp, \#-([0-9]{1,8})\]\!/o; $dre = qr/^.*sub.*sp, sp, #(0x$x{1,8})/o; } elsif ($arch eq 'arm') { #c0008ffc: e24dd064 sub sp, sp, #100 ; 0x64 $re = qr/.*sub.*sp, sp, #([0-9]{1,4})/o; $sub = \&arm_push_handling; } elsif ($arch =~ /^x86(_64)?$/ || $arch =~ /^i[3456]86$/) { #c0105234: 81 ec ac 05 00 00 sub $0x5ac,%esp # or # 2f60: 48 81 ec e8 05 00 00 sub $0x5e8,%rsp $re = qr/^.*[as][du][db] \$(0x$x{1,8}),\%(e|r)sp$/o; $dre = qr/^.*[as][du][db] (%.*),\%(e|r)sp$/o; } elsif ($arch eq 'ia64') { #e0000000044011fc: 01 0f fc 8c adds r12=-384,r12 $re = qr/.*adds.*r12=-(([0-9]{2}|[3-9])[0-9]{2}),r12/o; } elsif ($arch eq 'm68k') { # 2b6c: 4e56 fb70 linkw %fp,#-1168 # 1df770: defc ffe4 addaw #-28,%sp $re = qr/.*(?:linkw %fp,|addaw )#-([0-9]{1,4})(?:,%sp)?$/o; } elsif ($arch eq 'mips64') { #8800402c: 67bdfff0 daddiu sp,sp,-16 $re = qr/.*daddiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o; } elsif ($arch eq 'mips') { #88003254: 27bdffe0 addiu sp,sp,-32 $re = qr/.*addiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o; } elsif ($arch eq 'nios2') { #25a8: defffb04 addi sp,sp,-20 $re = qr/.*addi.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o; } elsif ($arch eq 'openrisc') { # c000043c: 9c 21 fe f0 l.addi r1,r1,-272 $re = qr/.*l\.addi.*r1,r1,-(([0-9]{2}|[3-9])[0-9]{2})/o; } elsif ($arch eq 'parisc' || $arch eq 'parisc64') { $re = qr/.*ldo ($x{1,8})\(sp\),sp/o; } elsif ($arch eq 'powerpc' || $arch =~ /^ppc(64)?(le)?$/ ) { # powerpc : 94 21 ff 30 stwu r1,-208(r1) # ppc64(le) : 81 ff 21 f8 stdu r1,-128(r1) $re = qr/.*st[dw]u.*r1,-($x{1,8})\(r1\)/o; } elsif ($arch =~ /^s390x?$/) { # 11160: a7 fb ff 60 aghi %r15,-160 # or # 100092: e3 f0 ff c8 ff 71 lay %r15,-56(%r15) $re = qr/.*(?:lay|ag?hi).*\%r15,-(([0-9]{2}|[3-9])[0-9]{2}) (?:\(\%r15\))?$/ox; } elsif ($arch =~ /^sh64$/) { #XXX: we only check for the immediate case presently, # though we will want to check for the movi/sub # pair for larger users. -- PFM. #a00048e0: d4fc40f0 addi.l r15,-240,r15 $re = qr/.*addi\.l.*r15,-(([0-9]{2}|[3-9])[0-9]{2}),r15/o; } elsif ($arch eq 'sparc' || $arch eq 'sparc64') { # f0019d10: 9d e3 bf 90 save %sp, -112, %sp $re = qr/.*save.*%sp, -(([0-9]{2}|[3-9])[0-9]{2}), %sp/o; } else { print("wrong or unknown architecture \"$arch\"\n"); exit } } # # To count stack usage of push {*, fp, ip, lr, pc} instruction in ARM, # if FRAME POINTER is enabled. # e.g. c01f0d48: e92ddff0 push {r4, r5, r6, r7, r8, r9, sl, fp, ip, lr, pc} # sub arm_push_handling { my $regex = qr/.*push.*fp, ip, lr, pc}/o; my $size = 0; my $line_arg = shift; if ($line_arg =~ m/$regex/) { $size = $line_arg =~ tr/,//; $size = ($size + 1) * 4; } return $size; } # # main() # my ($func, $file, $lastslash, $total_size, $addr, $intro); $total_size = 0; while (my $line = <STDIN>) { if ($line =~ m/$funcre/) { $func = $1; next if $line !~ m/^($xs*)/; if ($total_size > $min_stack) { push @stack, "$intro$total_size\n"; } $addr = $1; $addr =~ s/ /0/g; $addr = "0x$addr"; $intro = "$addr $func [$file]:"; my $padlen = 56 - length($intro); while ($padlen > 0) { $intro .= ' '; $padlen -= 8; } $total_size = 0; } elsif ($line =~ m/(.*):\s*file format/) { $file = $1; $file =~ s/\.ko//; $lastslash = rindex($file, "/"); if ($lastslash != -1) { $file = substr($file, $lastslash + 1); } } elsif ($line =~ m/$re/) { my $size = $1; $size = hex($size) if ($size =~ /^0x/); if ($size > 0xf0000000) { $size = - $size; $size += 0x80000000; $size += 0x80000000; } next if ($size > 0x10000000); $total_size += $size; } elsif (defined $dre && $line =~ m/$dre/) { my $size = $1; $size = hex($size) if ($size =~ /^0x/); $total_size += $size; } elsif (defined $sub) { my $size = &$sub($line); $total_size += $size; } } if ($total_size > $min_stack) { push @stack, "$intro$total_size\n"; } # Sort output by size (last field) print sort { ($b =~ /:\t*(\d+)$/)[0] <=> ($a =~ /:\t*(\d+)$/)[0] } @stack;
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