re: port-sparc/55573: sparc testbed logs many "coprocessor instruction" messages

[matthew green <mrg%eterna.com.au@localhost>]

The following reply was made to PR port-sparc/55573; it has been noted by GNATS.

From: matthew green <mrg%eterna.com.au@localhost>
To: gnats-bugs%netbsd.org@localhost, martin%duskware.de@localhost
Cc: port-sparc-maintainer%netbsd.org@localhost, gnats-admin%netbsd.org@localhost,
    netbsd-bugs%netbsd.org@localhost, gson%gson.org@localhost (Andreas Gustafsson)
Subject: re: port-sparc/55573: sparc testbed logs many "coprocessor instruction" messages
Date: Fri, 14 Aug 2020 19:58:04 +1000

 >  Martin Husemann wrote:
 >  >  This is a FPU instruction with FPU disabled (trap T_CPDISABLED),
 >  >  sending a SIGILL to the process.
 >  
 >  A number of ATF test cases also trigger the message, yet they pass;
 >  if they are getting a SIGILL, why don't they fail?
 
 i suspect that this is sparcv9 code that has the same instruction
 encoding as sparcv8 co-pro (the conditional branches do, and so
 do many of the VIS instructions, and a few others.)
 
 if i'm right, we should just disable the message.
 
 
 .mrg.