Re: [Linux-ia64] fpswa logging redux

From: Keith Owens <kaos_at_sgi.com>
Date: 2002-12-12 10:07:57
On Wed, 11 Dec 2002 14:25:14 -0800, 
Jesse Barnes <jbarnes@sgi.com> wrote:
>I've recently had some requests from people running apps on our ia64
>boxes for more detailed fpswa fault information.  Currently, the ia64
>kernel will print up to a certain number of fpswa fault messages per
>tick, with ip information about where the fault came from.  The user can
>also choose to be notified of faults via a SIGFPE signal, but the
>si_info field of the siginfo structure doesn't contain enough
>information about the fault to be useful.
>
>I'd like to fully decode the information in the isr about what type of
>fault occured (whether it be a software assist fault, some sort of IEEE
>filter fault, etc.) and print it along with the ip when faults occur.
>While I'm at it, I may as well the proper SIGFPE subcode into si_info in
>case of signal delivery is selected.

I have a couple of Perl scripts for decoding isr and psr.  They read
hex values (with or without the leading 0x) from stdin and pretty print
the result.

--- ia64_isr ---

#!/usr/bin/perl -w
use strict;
use integer;

my @fields = (
	[ 0, 16, "Code" ],
	[ 16, 8, "Vector" ],
	[ 24, 8, "rv" ],
	[ 32, 1, "x" ],
	[ 33, 1, "w" ],
	[ 34, 1, "r" ],
	[ 35, 1, "na" ],
	[ 36, 1, "sp" ],
	[ 37, 1, "rs" ],
	[ 39, 1, "ni" ],
	[ 40, 1, "so" ],
	[ 41, 2, "ei" ],
	[ 43, 1, "ed" ],
	[ 44, 20, "rv" ],
	);

while (defined($_ = <STDIN>)) {
	chomp();
	s/^0[xX]//;
	my $w0 = hex(substr($_, 0, -8));
	my $w1 = hex(substr($_, -8));
	printf("isr %s\n", $_);
	&ia64_isr($w1, 0, 32);
	&ia64_isr($w0, 32, 64);
}

sub ia64_isr()
{
	my ($w, $s, $e) = @_;
	my $v;
	foreach (@fields) {
		next if ($_->[0] >= $e || $_->[0] < $s);
		# use integer implies signed shift, I want unsigned
		no integer;
		$v = ($w >> ($_->[0] - $s)) & (~0 >> (32 - $_->[1]));
		printf("%2d %2d %12s %x\n", $_->[0], $_->[1], $_->[2], $v);
	}
}

--- ia64_psr ---

#!/usr/bin/perl -w
use strict;
use integer;

my @fields = (
	[ 0, 6, "User mask" ],
	[ 0, 1, "rv" ],
	[ 1, 1, "be" ],
	[ 2, 1, "up" ],
	[ 3, 1, "ac" ],
	[ 4, 1, "mfl" ],
	[ 5, 1, "mfh" ],
	[ 0, 24, "System mask" ],
	[ 6, 6, "rv" ],
	[ 13, 1, "ic" ],
	[ 14, 1, "i" ],
	[ 15, 1, "pk" ],
	[ 16, 1, "rv" ],
	[ 17, 1, "dt" ],
	[ 18, 1, "dfl" ],
	[ 19, 1, "dfh" ],
	[ 20, 1, "sp" ],
	[ 21, 1, "pp" ],
	[ 22, 1, "di" ],
	[ 23, 1, "si" ],
	[ 24, 1, "db" ],
	[ 25, 1, "lp" ],
	[ 26, 1, "tb" ],
	[ 27, 1, "rt" ],
	[ 28, 4, "rv" ],
	[ 32, 2, "cpl" ],
	[ 34, 1, "is" ],
	[ 35, 1, "mc" ],
	[ 36, 1, "it" ],
	[ 37, 1, "id" ],
	[ 38, 1, "da" ],
	[ 39, 1, "dd" ],
	[ 40, 1, "ss" ],
	[ 41, 2, "ri" ],
	[ 43, 1, "ed" ],
	[ 44, 1, "bn" ],
	[ 45, 1, "ia" ],
	[ 46, 18, "rv" ]
	);

while (defined($_ = <STDIN>)) {
	chomp();
	s/^0[xX]//;
	my $w0 = hex(substr($_, 0, -8));
	my $w1 = hex(substr($_, -8));
	printf("psr %s\n", $_);
	&ia64_psr($w1, 0, 32);
	&ia64_psr($w0, 32, 64);
}

sub ia64_psr()
{
	my ($w, $s, $e) = @_;
	my $v;
	foreach (@fields) {
		next if ($_->[0] >= $e || $_->[0] < $s);
		# use integer implies signed shift, I want unsigned
		no integer;
		$v = ($w >> ($_->[0] - $s)) & (~0 >> (32 - $_->[1]));
		printf("%2d %2d %12s %x\n", $_->[0], $_->[1], $_->[2], $v);
	}
}
Received on Wed Dec 11 15:08:15 2002

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