Re: Subject: Re: make checkstack on m68k

[Jörn Engel]

On Thu, 17 June 2004 18:43:18 +1000, Finn Thain wrote:
> To:	Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>,
> 	Linux/m68k <linux-m68k@xxxxxxxxxxxxxxxxxxxx>,
> 	Matt Mackall <mpm@xxxxxxxxxxx>,
> 	Linux Kernel Development <linux-kernel@xxxxxxxxxxxxxxx>

Who are you replying to again? ;)

> Jörn Engel wrote:
> 
> > On Wed, 16 June 2004 18:51:03 +0200, Geert Uytterhoeven wrote:
> > >
> > > @@ -40,6 +40,11 @@
> > >  	} elsif ($arch =~ /^ia64$/) {
> > >  		#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 =~ /^m68k$/) {
> > > +		#2b6c:       4e56 fb70       linkw %fp,#-1168
> > > +		#$re = qr/.*linkw %fp,#-([0-9]{1,4})/o;
> > > +		#1df770:       defc ffe4       addaw #-28,%sp
> > > +		$re = qr/.*addaw #-([0-9]{1,4}),%sp/o;
> >
> > For i386 I used a really ugly hack, but this needs someone with better
> > perl skills.  Matt, can you find a nice regex?  If it adds more
> > brackets, that's fine.  We'll just add empty brackets to the other
> > regexes and use $2 instead of $1 or so.
> 
> There is no nice way to do this in perl in a single regex and have the
> result always in $1 or always in $2. So you would test for undef in one
> and use the other.  But then the other arch regexes that capture more than
> one cluster would need to be rewritten to use (?: ) syntax to get
> clustering without capturing (see man perlre) so as to leave $2 undefined.
> 
> A list of regexes for each arch would be nice. But should probably be
> left until needed. Following is probably the simplest way. The regexes
> remain understandable to mortals since they don't do fancy stuff. And the
> other archs don't need to be touched.

It's not as ugly as my hack.  Can I get a success report from m68k?
Thanks!

> --- linux-2.6.7/Makefile	2004-06-16 13:06:15.000000000 +0200
> +++ linux-m68k-2.6.7/Makefile	2004-06-16 18:27:13.000000000 +0200
> @@ -1070,7 +1070,7 @@ endif #ifeq ($(mixed-targets),1)
>  .PHONY: checkstack
>  checkstack:
>  	$(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
> -	$(PERL) scripts/checkstack.pl $(ARCH)
> +	$(PERL) $(src)/scripts/checkstack.pl $(ARCH)
> 
>  # FIXME Should go into a make.lib or something
>  # ===========================================================================
> --- linux-2.6.7/scripts/checkstack.pl	Thu Jun 17 18:06:18 2004
> +++ linux-m68k-2.6.7/scripts/checkstack.pl	Thu Jun 17 18:09:21 2004
> @@ -12,7 +12,7 @@
>  #	Random bits by Matt Mackall <mpm@xxxxxxxxxxx>
>  #
>  #	Usage:
> -#	objdump -d vmlinux | stackcheck_ppc.pl [arch]
> +#	objdump -d vmlinux | stackcheck.pl [arch]
>  #
>  #	TODO :	Port to all architectures (one regex per arch)
> 
> @@ -40,6 +40,11 @@
>  	} elsif ($arch =~ /^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 =~ /^m68k$/) {
> +		#2b6c:       4e56 fb70       linkw %fp,#-1168
> +		$re = qr/.*linkw %fp,#-([0-9]{1,4})/o;
> +		#1df770:       defc ffe4       addaw #-28,%sp
> +		$re_2 = qr/.*addaw #-([0-9]{1,4}),%sp/o;
>  	} elsif ($arch =~ /^mips64$/) {
>  		#8800402c:       67bdfff0        daddiu  sp,sp,-16
>  		$re = qr/.*daddiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
> @@ -75,7 +80,7 @@
>  	if ($line =~ m/$funcre/) {
>  		$func = $1;
>  	}
> -	if ($line =~ m/$re/) {
> +	if ($line =~ m/$re/ or (defined($re_2) && $line =~ m/$re_2/)) {
>  		my $size = $1;
>  		$size = hex($size) if ($size =~ /^0x/);

Jörn

-- 
When in doubt, punt.  When somebody actually complains, go back and fix it...
The 90% solution is a good thing.
-- Rob Landley
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