Date: Thu, 22 Jul 1999 18:51:16 +0200 From: Martin Cracauer <cracauer@cons.org> To: Bruce Evans <bde@zeta.org.au> Cc: cracauer@cons.org, freebsd-current@FreeBSD.ORG Subject: Re: Using float emulator on a system with FPU? Message-ID: <19990722185115.A27722@cons.org> In-Reply-To: <199907121144.VAA07535@godzilla.zeta.org.au>; from Bruce Evans on Mon, Jul 12, 1999 at 09:44:59PM %2B1000 References: <199907121144.VAA07535@godzilla.zeta.org.au>
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In <199907121144.VAA07535@godzilla.zeta.org.au>, Bruce Evans wrote: > >I'm going to work on FreeBSD's floating point support, but I need to > >test my changes on systems using the FPU emulators (non-GPL and GPL). > > > >Is there any way to use these emulators on a system that has a > >hardware FPU? > > Toggling `npx_exists' using ddb used to work. Now, toggling it off > on i586 systems causes a panic in the i586-optimised copy routines. This particular problem has a hook in npx.c: device npx0 [...] flags 7 seems to do the trick (disables usage of FPU-optimized mem stuff). I am now able to switch "npx_exists" between npx_probe1() and npx_attach(), which let me run with the emulator on a Pentium. But only from serial kgdb, since as you noted in your other message, symbols are not available to ddb in ELF kernels started with -d. I assume you use kdb_init() from db_elf.c, you how do you call it given that you neither have the symbol (not loaded yet) nor the address (`nm /kernel` output not useful)? [Throwing an egg after the chicken that fails to produce the egg] Martin -- %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Martin Cracauer <cracauer@cons.org> http://www.cons.org/cracauer/ Tel.: (private) +4940 5221829 Fax.: (private) +4940 5228536 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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