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SubjectRe: [PATCH] add checkstack Makefile target
Yet another version:
- Arch dependent code is reduced to one regular expression.
- Much shorter.
- A tiny bit faster.

Still, Keith' code beats the crap out of mine, speed-wise.

Jörn

--
Rules of Optimization:
Rule 1: Don't do it.
Rule 2 (for experts only): Don't do it yet.
-- M.A. Jackson

diff -Naur linux-2.5.63/arch/i386/Makefile linux-2.5.63-csb1/arch/i386/Makefile
--- linux-2.5.63/arch/i386/Makefile Mon Feb 24 20:05:15 2003
+++ linux-2.5.63-csb1/arch/i386/Makefile Wed Mar 5 14:18:51 2003
@@ -124,3 +124,6 @@
echo ' install to $$(INSTALL_PATH) and run lilo'
endef

+checkstack: vmlinux
+ $(OBJDUMP) -d vmlinux | \
+ scripts/checkstack.pl $(ARCH)
diff -Naur linux-2.5.63/arch/ppc/Makefile linux-2.5.63-csb1/arch/ppc/Makefile
--- linux-2.5.63/arch/ppc/Makefile Mon Feb 24 20:05:06 2003
+++ linux-2.5.63-csb1/arch/ppc/Makefile Wed Mar 5 14:18:38 2003
@@ -109,3 +109,7 @@
CLEAN_FILES += include/asm-$(ARCH)/offsets.h.tmp \
include/asm-$(ARCH)/offsets.h \
arch/$(ARCH)/kernel/asm-offsets.s
+
+checkstack: vmlinux
+ $(OBJDUMP) -d vmlinux | \
+ scripts/checkstack.pl $(ARCH)
diff -Naur linux-2.5.63/scripts/checkstack.pl linux-2.5.63-csb1/scripts/checkstack.pl
--- linux-2.5.63/scripts/checkstack.pl Thu Jan 1 01:00:00 1970
+++ linux-2.5.63-csb1/scripts/checkstack.pl Wed Mar 5 18:04:19 2003
@@ -0,0 +1,75 @@
+#!/usr/bin/perl
+
+# Check the stack usage of functions
+#
+# Copyright Joern Engel <joern@wh.fh-wedel.de>
+# Inspired by Linus Torvalds
+# Original idea maybe from Keith Owens
+#
+# Usage:
+# objdump -d vmlinux | \
+# stackcheck_ppc.pl
+#
+# TODO : Port to all architectures (one regex per arch)
+# Speed this puppy up
+
+# check for arch
+#
+# $re is used for three matches:
+# $& (whole re) matches the complete objdump line with the stack growth
+# $1 (first bracket) matches the code that will be displayed in the output
+# $2 (second bracket) matches the size of the stack growth
+#
+# use anything else and feel the pain ;)
+{
+ my $arch = shift;
+ $x = "[0-9a-f]"; # hex character
+ $X = "[0-9a-fA-F]"; # hex character
+ if ($arch =~ /^i386$/) {
+ #c0105234: 81 ec ac 05 00 00 sub $0x5ac,%esp
+ $re = qr/^$x{8}:\t.. .. .. .. .. .. \t(sub \$(0x$x{3,5}),\%esp)$/o;
+ } elsif ($arch =~ /^ppc$/) {
+ #c00029f4: 94 21 ff 30 stwu r1,-208(r1)
+ $re = qr/.*(stwu.*r1,-($x{3,5})\(r1\))/o;
+ } else {
+ print "wrong or unknown architecture\n";
+ exit
+ }
+}
+
+sub bysize($) {
+ ($asize = $a) =~ s/$re/\2/;
+ ($bsize = $b) =~ s/$re/\2/;
+ $bsize <=> $asize
+}
+
+#
+# main()
+#
+while (defined($line = <STDIN>)) {
+ if ($line =~ m/$re/) {
+ (my $addr = $line) =~ s/^($x{8}).*/0x\1/o;
+ chomp($addr);
+
+ my $ksymoops = `ksymoops -v vmlinux -m System.map -K -L -O -A $addr | \
+ tail -2 | head -1`;
+ (my $func = $ksymoops) =~ s/^Adhoc [0-9a-f]{8} (<.*>)/\1/;
+ chomp($func);
+
+ my $intro = "$addr $func:";
+ my $padlen = 56 - length($intro);
+ while ($padlen > 0) {
+ $intro .= ' ';
+ $padlen -= 8;
+ }
+ (my $code = $line) =~ s/$re/\1/;
+
+ $stack[@stack] = "$intro $code";
+ }
+}
+
+@sortedstack = sort bysize @stack;
+
+foreach $i (@sortedstack) {
+ print("$i");
+}
-
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