* [9fans] 8c dying with out of fixed registers
@ 2005-05-06 19:59 "Nils O. Selåsdal"
0 siblings, 0 replies; 5+ messages in thread
From: "Nils O. Selåsdal" @ 2005-05-06 19:59 UTC (permalink / raw)
To: 9fans
Hello,
I've been trying to compile some crypto code, and it seems 8c
isn't always too happy about it. I eventually got the monster ting
reduced to the below (now very-nonsense code) snippet which dies with;
a.c:22 out of fixed registers
8c 2655: suicide: sys: trap: fault read addr=0x0 pc=0x00036d93
So, for anyone that's bored, and wants to fix the compiler:
#include <u.h>
static uvlong T7[256];
void f(unsigned char *key)
{
uvlong K1;
int r;
uvlong *S = T7;
for (r = 1; r < 16; r++) {
K1 =
T7[S[(int)(K1 >> 56) ] & 0xff] ^
T7[(int)S[(int)(K1 >> 48) & 0xff] & 0xff] ^
T7[(int)S[(int)(K1 >> 40) & 0xff] & 0xff] ^
T7[(int)S[(int)(K1 >> 32) & 0xff] & 0xff] ^
T7[(int)S[(int)(K1 >> 24) & 0xff] & 0xff] ^
T7[(int)S[(int)(K1 >> 16) & 0xff] & 0xff] ^
T7[(int)S[(int)(K1 >> 8) & 0xff] & 0xff] ^
T7[(int)S[(int)(K1 ) & 0xff] & 0xff];
}
}
In the mean time, I'll rewrite the piece of code...
--
Nils O. Selåsdal
^ permalink raw reply [flat|nested] 5+ messages in thread
[parent not found: <85082ec2f1cbf83a5db6ecf7ff111f3b@plan9.ucalgary.ca>]
[parent not found: <a27dc8e08d6f5936960797156b50a514@plan9.ucalgary.ca>]
* Re: [9fans] 8c dying with out of fixed registers
[not found] <a27dc8e08d6f5936960797156b50a514@plan9.ucalgary.ca>
@ 2005-05-06 21:17 ` "Nils O. Selåsdal"
0 siblings, 0 replies; 5+ messages in thread
From: "Nils O. Selåsdal" @ 2005-05-06 21:17 UTC (permalink / raw)
To: 9fans
andrey mirtchovski wrote:
>>It only uses u.h, and I see nothing funny, thats even near a 32K limit, even
>>after cpp.
>>
>>Or did I just not understand your statement correctly. (*confused*)
>
>
> without an lstk() of the broken 8c binary everything is just
> speculation. i didn't know any context, so i just suggested one bug
> that i know of as a possibility. it wasn't even an educated guess
> (hence i omitted 9fans from the recipients list)
You can compile the snippet and lstk the broken 8c. That's why I tried to
massage it down to a single little sweet function, so others could try it
if they're up to the task ;-)
(Or is it only for me the piece originally posted suicides ?)
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2005-05-06 21:17 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2005-05-06 19:59 [9fans] 8c dying with out of fixed registers "Nils O. Selåsdal"
[not found] <85082ec2f1cbf83a5db6ecf7ff111f3b@plan9.ucalgary.ca>
2005-05-06 20:34 ` "Nils O. Selåsdal"
2005-05-06 21:00 ` andrey mirtchovski
2005-05-06 21:08 ` andrey mirtchovski
[not found] <a27dc8e08d6f5936960797156b50a514@plan9.ucalgary.ca>
2005-05-06 21:17 ` "Nils O. Selåsdal"
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).