Re: [Qemu-devel] [PATCH v2 0/5] target/m68k: implement 680x0 FPU (part 3)

[Laurent Vivier]

Le 29/11/2017 à 13:49, Peter Maydell a écrit :
> On 23 November 2017 at 16:35, Laurent Vivier <address@hidden> wrote:
>> Implement fmod, frem, fscale, fgetman and fgetexp.
>>
>> Instead of using functions of libm (v1 of this series)
>> and converting between host long double and floatx80 type
>> the new version (v2) adds new floatx80 functions in softfloat.
>>
>> All the floatx80 functions are copied from "Previous",
>> the NeXT Computer Emulator, and written by Andreas Grabher.
> 
> Hi; what license is that code under? Can you provide
> a link to the original sources that you're taking the
> functions from, please?

Hi,

these functions come from:

http://previous.alternative-system.com/

http://svn.code.sf.net/p/previous/code/trunk/src/softfloat/softfloat.c

This is also a modified softfloat, release 2b
which is BSD license if I'm correct.

Their softfloat files seem to come from MAME

http://svn.code.sf.net/p/previous/code/trunk/src/softfloat/README.txt

and MAME is GPL:
http://mamedev.org/legal.html

and Previous is a fork of Hatari (GPL), a fork of UAE (GPL)
https://hatari.tuxfamily.org/index.html

This code has also been copied to WinUAE (GPL), where softfloat has been
copied from QEMU:
https://github.com/tonioni/WinUAE/blob/master/softfloat/softfloat.cpp

But I think the bad news comes later:

all the other functions (sin, cos, tan, log, exp, ...) found in previous
(softfloat_fpsp.c) are "derived" from NeXT library FPSP:

http://svn.code.sf.net/p/previous/code/trunk/src/softfloat/softfloat_fpsp.c

/*============================================================================

 This C source file is an extension to the SoftFloat IEC/IEEE Floating-point
 Arithmetic Package, Release 2a.

 Written by Andreas Grabher for Previous, NeXT Computer Emulator.

=============================================================================*/
...
/*----------------------------------------------------------------------------
| Algorithms for transcendental functions supported by MC68881 and MC68882
| mathematical coprocessors. The functions are derived from FPSP library.
*----------------------------------------------------------------------------*/

FPSP library can be found:

https://ftp.nice.ch/pub/next/developer/hardware/m68k/

And the assembly source code is not free at all:

https://ftp.nice.ch/pub/next/developer/hardware/m68k/_libFPSP.1.p2.N.s/l_fpsp.h


|               Copyright (C) Motorola, Inc. 1991
|                       All Rights Reserved
|
|       THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF MOTOROLA
|       The copyright notice above does not evidence any
|       actual or intended publication of such source code.


So I'm wondering what license apply to the C version found in "Previous".

Thanks,
Laurent