linux-kernel - [PATCH 3/4] scripts/checkstack.pl: add arm push handling for stack usage

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Date:   Thu, 30 Apr 2020 18:19:31 +0530
From:   Maninder Singh <maninder1.s@...sung.com>
To:     yamada.masahiro@...ionext.com, george_davis@...tor.com
Cc:     linux-kernel@...r.kernel.org, a.sahrawat@...sung.com,
        Maninder Singh <maninder1.s@...sung.com>,
        Vaneet Narang <v.narang@...sung.com>
Subject: [PATCH 3/4] scripts/checkstack.pl: add arm push handling for stack
 usage

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}

c01f0d50 <Y>:
c01f0d44:       e1a0c00d        mov     ip, sp
c01f0d48:       e92ddff0        push    {r4, r5, r6, r7, r8, r9, sl, fp, ip, lr, pc}
c01f0d4c:       e24cb004        sub     fp, ip, #4
c01f0d50:       e24dd094        sub     sp, sp, #448    ; 0x1C0 

$ cat dump | scripts/checkstack.pl arm
0xc01f0d50 Y []:                                        448

added subroutine frame work for this.
After change:
0xc01f0d500 Y []:                                       492

Signed-off-by: Vaneet Narang <v.narang@...sung.com>
Signed-off-by: Maninder Singh <maninder1.s@...sung.com>
---
 scripts/checkstack.pl | 27 ++++++++++++++++++++++++++-
 1 file changed, 26 insertions(+), 1 deletion(-)

diff --git a/scripts/checkstack.pl b/scripts/checkstack.pl
index 8e5ef98..b292ef4 100755
--- a/scripts/checkstack.pl
+++ b/scripts/checkstack.pl
@@ -34,8 +34,10 @@ use strict;
 # $& (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, $x, $xs, $funcre, $min_stack);
+my (@stack, $re, $dre, $sub, $x, $xs, $funcre, $min_stack);
 {
 	my $arch = shift;
 	if ($arch eq "") {
@@ -59,6 +61,7 @@ my (@stack, $re, $dre, $x, $xs, $funcre, $min_stack);
 	} elsif ($arch eq 'arm') {
 		#c0008ffc:	e24dd064	sub	sp, sp, #100	; 0x64
 		$re = qr/.*sub.*sp, sp, #(([0-9]{2}|[3-9])[0-9]{2})/o;
+		$sub = \&arm_push_handling;
 	} elsif ($arch =~ /^x86(_64)?$/ || $arch =~ /^i[3456]86$/) {
 		#c0105234:       81 ec ac 05 00 00       sub    $0x5ac,%esp
 		# or
@@ -112,6 +115,24 @@ my (@stack, $re, $dre, $x, $xs, $funcre, $min_stack);
 }
 
 #
+# 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);
@@ -163,6 +184,10 @@ while (my $line = <STDIN>) {
 		$size = hex($size) if ($size =~ /^0x/);
 		$total_size = $total_size + $size
 	}
+	elsif (defined $sub) {
+		my $size = &$sub($line);
+		$total_size = $total_size + $size;
+	}
 }
 if ($total_size > $min_stack) {
 	push @stack, "$intro$total_size\n";
-- 
1.9.1