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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>
#
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>
#
loongarch port by Youling Tang <tangyouling@kylinos.cn>
#
#
Usage:
#
objdump -d vmlinux | scripts/checkstack.pl [arch] [min_stack]
#
#
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
= 512;
}
$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
'
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]{1,8})
/
o
;
}
elsif
(
$arch
eq
'
mips
'
) {
#
88003254: 27bdffe0 addiu sp,sp,-32
$re
=
qr
/
.*addiu.*sp,sp,-([0-9]{1,8})
/
o
;
}
elsif
(
$arch
eq
'
nios2
'
) {
#
25a8: defffb04 addi sp,sp,-20
$re
=
qr
/
.*addi.*sp,sp,-([0-9]{1,8})
/
o
;
}
elsif
(
$arch
eq
'
openrisc
'
) {
#
c000043c: 9c 21 fe f0 l.addi r1,r1,-272
$re
=
qr
/
.*l
\.
addi.*r1,r1,-([0-9]{1,8})
/
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]+)(?:
\(\%
r15
\)
)?
$
/
o
;
}
elsif
(
$arch
eq
'
sparc
'
||
$arch
eq
'
sparc64
'
) {
#
f0019d10: 9d e3 bf 90 save %sp, -112, %sp
$re
=
qr
/
.*save.*
%sp
, -([0-9]{1,8}),
%sp
/
o
;
}
elsif
(
$arch
=~
/
^riscv(64)?
$
/
) {
#
ffffffff8036e868: c2010113 addi sp,sp,-992
$re
=
qr
/
.*addi.*sp,sp,-([0-9]{1,8})
/
o
;
}
elsif
(
$arch
=~
/
^loongarch(32|64)?
$
/
) {
#
9000000000224708: 02ff4063 addi.d $sp, $sp, -48(0xfd0)
$re
=
qr
/
.*addi
\.
.*sp, .*sp, -([0-9]{1,8}).*
/
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
/
^(
$x
*)
/
;
if
(
$total_size
>
$min_stack
) {
push
@stack
,
"
$intro$total_size
\n
"
;
}
$addr
=
"
0x
$1
"
;
$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) and function name if size is the same
sub
sort_lines
{
my
(
$a
,
$b
) =
@_
;
my
$num_a
=
$1
if
$a
=~
/
:
\t
*(
\d
+)
$
/
;
my
$num_b
=
$1
if
$b
=~
/
:
\t
*(
\d
+)
$
/
;
my
$func_a
=
$1
if
$a
=~
/
(.*):
/
;
my
$func_b
=
$1
if
$b
=~
/
(.*):
/
;
if
(
$num_a
!=
$num_b
) {
return
$num_b
<=>
$num_a
;
}
else
{
return
$func_a
cmp
$func_b
;
}
}
print
sort
{ sort_lines(
$a
,
$b
) }
@stack
;
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