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#!/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

# 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 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;