#!/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>#	riscv port by Wadim Mueller <wafgo01@gmail.com>##	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		$re = qr/.*save.*%sp, -(([0-9]{2}|[3-9])[0-9]{2}), %sp/o;	} elsif ($arch =~ /^riscv(64)?$/) {		#ffffffff8036e868:	c2010113          	addi	sp,sp,-992		$re = qr/.*addi.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;	} else {		print("wrong or unknown architecture \"$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;