Re: port-mac68k/13078 (Mac 68LC040 problem)

["Nat Sloss via gnats" <gnats-admin%NetBSD.org@localhost>]

The following reply was made to PR port-mac68k/13078; it has been noted by GNATS.

From: Nat Sloss <nathanialsloss%yahoo.com.au@localhost>
To: Martin Husemann <martin%duskware.de@localhost>
Cc: gnats-bugs%netbsd.org@localhost
Subject: Re: port-mac68k/13078 (Mac 68LC040 problem)
Date: Mon, 2 Dec 2024 23:51:25 +1100

 I have two simpler patches for consideration they are similar exepept one sees 
 if the assembled instruction starts with an 'f' (i would have to add 
 instructions starting with 'p' also) and the second alternatvely checks the 
 assembled opcode is a n f-line instruction and applies the fix.
 
 They patch sys/m68k to ensure there's a nop at the end to task switching just 
 incase it switching into an f-line instruction and patch the assembler gas to 
 add the nops before f-line instructions:
 
 http://ftp.netbsd.org/pub/NetBSD/misc/nat/lc040nop-fpuemul.fix-gas.diff
 
 http://ftp.netbsd.org/pub/NetBSD/misc/nat/lc040nop-fpuemul.fix-gas-take2.diff
 
 I believe take2 is the preferred one would you agree?
 
 These patches patch all f-line (coprocessor and fpu instructions) without 
 needing to alter the way m86k assembler is written (provided you use labels 
 and not hardcoded addresses based on instruction byte counting).
 
 Best regards,
 
 Nat