add script which measures stack consumption.

Current top users:

0x08052f52 uncompress []:                               393312
0x080c8a58 input_tab []:                                82104
0x08092d5b ifaddrlist []:                               32828
0x08056163 loadfont_main []:                            32796
0x0806e508 colon []:                                    16532
0x08056095 do_loadfont []:                              16400
0x0806da70 place_cursor []:                             16388
0x080792e8 login_main []:                               9176

393 kb of stack??? OMG...

3 files changed, 144 insertions, 1 deletions

diff --git a/Makefile.custom b/Makefile.custom
index d0aff3799..cf3d14321 100644
--- a/Makefile.custom
+++ b/Makefile.custom
@@ -79,9 +79,13 @@ baseline: busybox_unstripped
 objsizes: busybox_unstripped
         $(srctree)/scripts/objsizes
 
+.PHONY: stksizes
+stksizes: busybox_unstripped
+        $(CROSS_COMPILE)objdump -d busybox_unstripped | $(srctree)/scripts/checkstack.pl $(ARCH)
+
 .PHONY: bigdata
 bigdata: busybox_unstripped
-        nm --size-sort busybox_unstripped | grep -vi ' [tr] ' | tail -20
+        $(CROSS_COMPILE)nm --size-sort busybox_unstripped | grep -vi ' [tr] '
 
 # Documentation Targets
 .PHONY: doc
diff --git a/Makefile.help b/Makefile.help
index fc661b110..e2e13de0c 100644
--- a/Makefile.help
+++ b/Makefile.help
@@ -39,4 +39,6 @@ help:
         @echo '  release                - create a distribution tarball'
         @echo '  sizes                  - show size of all enabled busybox symbols'
         @echo '  objsizes               - show size of each .o object built'
+        @echo '  bigdata                - show data objects, biggest first'
+        @echo '  stksizes               - show stack users, biggest first'
         @echo
diff --git a/scripts/checkstack.pl b/scripts/checkstack.pl
new file mode 100755
index 000000000..41454ceb1
--- /dev/null
+++ b/scripts/checkstack.pl
@@ -0,0 +1,137 @@
+#!/usr/bin/perl
+
+# Stolen from Linux kernel :)
+
+#       Check the stack usage of functions
+#
+#       Copyright Joern Engel <joern@wh.fh-wedel.de>
+#       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
+#
+#       Usage:
+#       objdump -d vmlinux | checkstack.pl [arch]
+#
+#       TODO :  Port to all architectures (one regex per arch)
+
+# 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
+#
+# use anything else and feel the pain ;)
+my (@stack, $re, $x, $xs);
+{
+        my $arch = shift;
+        if ($arch eq "") {
+                $arch = `uname -m`;
+        }
+
+        $x      = "[0-9a-f]";   # hex character
+        $xs     = "[0-9a-f ]";  # hex character or space
+        if ($arch eq 'arm') {
+                #c0008ffc:      e24dd064        sub     sp, sp, #100    ; 0x64
+                $re = qr/.*sub.*sp, sp, #(([0-9]{2}|[3-9])[0-9]{2})/o;
+        } elsif ($arch =~ /^i[3456]86$/) {
+                #c0105234:       81 ec ac 05 00 00       sub    $0x5ac,%esp
+                $re = qr/^.*[as][du][db]    \$(0x$x{1,8}),\%esp$/o;
+        } elsif ($arch eq 'x86_64') {
+                #    2f60:      48 81 ec e8 05 00 00    sub    $0x5e8,%rsp
+                $re = qr/^.*[as][du][db]    \$(0x$x{1,8}),\%rsp$/o;
+        } elsif ($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 'ppc') {
+                #c00029f4:       94 21 ff 30     stwu    r1,-208(r1)
+                $re = qr/.*stwu.*r1,-($x{1,8})\(r1\)/o;
+        } elsif ($arch eq 'ppc64') {
+                #XXX
+                $re = qr/.*stdu.*r1,-($x{1,8})\(r1\)/o;
+        } elsif ($arch eq 'powerpc') {
+                $re = qr/.*st[dw]u.*r1,-($x{1,8})\(r1\)/o;
+        } elsif ($arch =~ /^s390x?$/) {
+                #   11160:       a7 fb ff 60             aghi   %r15,-160
+                $re = qr/.*ag?hi.*\%r15,-(([0-9]{2}|[3-9])[0-9]{2})/o;
+        } elsif ($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
+                $re = qr/.*addi\.l.*r15,-(([0-9]{2}|[3-9])[0-9]{2}),r15/o;
+        } else {
+                print("wrong or unknown architecture\n");
+                exit
+        }
+}
+
+sub bysize($) {
+        my ($asize, $bsize);
+        ($asize = $a) =~ s/.*:  *(.*)$/$1/;
+        ($bsize = $b) =~ s/.*:  *(.*)$/$1/;
+        $bsize <=> $asize
+}
+
+#
+# main()
+#
+my $funcre = qr/^$x* <(.*)>:$/;
+my $func;
+my $file, $lastslash;
+
+while (my $line = <STDIN>) {
+        if ($line =~ m/$funcre/) {
+                $func = $1;
+        }
+        elsif ($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);
+
+                next if $line !~ m/^($xs*)/;
+                my $addr = $1;
+                $addr =~ s/ /0/g;
+                $addr = "0x$addr";
+
+                my $intro = "$addr $func [$file]:";
+                my $padlen = 56 - length($intro);
+                while ($padlen > 0) {
+                        $intro .= '     ';
+                        $padlen -= 8;
+                }
+                next if ($size < 100);
+                push @stack, "$intro$size\n";
+        }
+}
+
+print sort bysize @stack;