phil@adam.adelaide.edu.au (Phil Kernick) (06/07/91)
What does KS1.3 do when the 680[01]0 processor gets an F-line exception?
Does it just bring up the GURU Alert or does it check for the presence
of a coprocessor (68881.resource??) and then pass control to it if it
exists?
Is there an OS friendly way of inserting exception vectors, rather than
for example:
LEA MyException, A0
MOVE.L A0, FLine_exception_vector
Which would really annoy the Enforcer?
Thanks,
Phil.
--
o| /// Phil Kernick EMail: phil@adam.adelaide.edu.au |o
| /// Departmental Engineer Phone: +61 8 228 5914 |
o| \\\/// Dept. of Psychology Fax: +61 8 224 0464 |o
| \/// University of Adelaide Mail: GPO Box 498 Adelaide SA 5001 |GHGAQA4@cc1.kuleuven.ac.be (Tyberghein Jorrit) (06/07/91)
>What doesKS13 do when the 680[01]0 processor gets an F-line exception? >Does it just bring up the GURU Alert or does it check for the presence >of a coprocessor (68881.resource??) and then pass control to it if it >exists? If you have a 6888(1 or 2) you will not get an F-line exception (provided you have a 68020 or 30). I don't know what will happen when you use the 68000 or 10 with a coprocessor. My guess is that you will get a GURU alert saying F-line exception. I don't think KS1.3 handles this (but I may be wrong ofcourse). >Is there an OS friendly way of inserting exception vectors, rather >than for example: > > LEA MyException, A0 > MOVE.L A0, FLine_exception_vector > >Which would really annoy the Enforcer? You have several options for this. 1. Use the above code but execute it in supervisor (With the execbase SuperVisor function). That way, enforcer will not complain (I think). If Enforcer still complains you can use special supervisor instructions to move values in memory without using the MMU table, but I don't know these instructions from memory (I think MOVES is the one). Ofcourse this is not very OS-friendly. 2. You can handle all the exceptions if you set the TC_TRAPCODE (or something like that) field in your task structure to your own routine. This routine will be executing in supervisor mode. The top of the (supervisor) stackframe will contain a longword with the exception number. The rest of the stackframe is the 680x0 exception stack frame. To end this routine you must remove the longword (put there by Exec) and execute RTE (return from exception). This way you are OS-friendly but you can only trap exceptions for one task (or rather, for each task you patch this way). 3. There is still another way. You can use the TRAPCODE field in the exec base structure. The only problem with this approach, is that the task-held or software error requester will appear before your exception routine is called. I don't know how to solve this (except by patching AutoRequest, EasyRequest, ...). Maybe someone else has an idea ? >Thanks, >Phil. Jorrit Tyberghein
billc@cryo.rain.com (William J. Coldwell) (06/08/91)
In article <phil.676256558@adam.adelaide.edu.au> phil@adam.adelaide.edu.au (Phil Kernick) writes: >What does KS1.3 do when the 680[01]0 processor gets an F-line exception? >Does it just bring up the GURU Alert or does it check for the presence >of a coprocessor (68881.resource??) and then pass control to it if it ^^^^^ is supposed to be "MathIEEE.resource". >exists? If it gets an F-line, it Alert()'s unless you have an F-Line exception (which is what you are hinting at down below). This is due to the 68881 being a peripheral processor, and not a "co-processor" on 68000's, 010's, and 008's. >Is there an OS friendly way of inserting exception vectors, rather than >for example: > > LEA MyException, A0 > MOVE.L A0, FLine_exception_vector > >Which would really annoy the Enforcer? I believe that this is a case where you will have to annoy Enforcer since you are mucking with 0 page. How about install your exception handler, then run Enforcer? ;-) >Thanks, >o| /// Phil Kernick EMail: phil@adam.adelaide.edu.au |o -- William J. Coldwell Amiga Attitude Adjuster Cryogenic Software 3-D Pro | Anim. Station | CA-650 CD-ROM | CMI PA/MPB | Interact AppleTalk Nexus HD/Aries | CSA 40/4 Magnum | RAMbrandt | Video Blender | DoubleTalk Internet: billc@cryo.rain.com UUCP: tektronix!percy!cryo!billc
carolyn@cbmvax.commodore.com (Carolyn Scheppner - CATS) (06/08/91)
In article <phil.676256558@adam.adelaide.edu.au> phil@adam.adelaide.edu.au (Phil Kernick) writes: >What does KS1.3 do when the 680[01]0 processor gets an F-line exception? >Does it just bring up the GURU Alert or does it check for the presence >of a coprocessor (68881.resource??) and then pass control to it if it >exists? Not positive on this but perhaps my trap example in the 1.3 RKM exec/tasks chapter will help. It installs trap code for a task and then proceeds to divide by zero harmlessly with the div 0 exceptions just counted by the trap code. Make sure you use -b0 when you compile the C part though (that was fixed in the comments for the Fish Disk version). As for math coprocessors, I think each of your tasks have to open one of the mathiee... libraries to get the proper task-switch handling of the FPU. I believe 1.3 SetPatch installs default exception handling code for FPU instructions executed on a machine without an FPU and that default code probably puts up a GURU. -- ========================================================================== Carolyn Scheppner -- Tech. Mgr. CATS - Commodore Amiga Technical Support PHONE 215-431-9180 {uunet,rutgers}!cbmvax!carolyn carolyn@commodore.com "Under the multitasking operating system, the trackdisk.device is the defied interface..." - Bryce ==========================================================================
mykes@amiga0.SF-Bay.ORG (Mike Schwartz) (06/09/91)
In article <billc.3544@cryo.rain.com> billc@cryo.rain.com (William J. Coldwell) writes: >In article <phil.676256558@adam.adelaide.edu.au> phil@adam.adelaide.edu.au (Phil Kernick) writes: >>What does KS1.3 do when the 680[01]0 processor gets an F-line exception? >>Does it just bring up the GURU Alert or does it check for the presence >>of a coprocessor (68881.resource??) and then pass control to it if it > ^^^^^ is supposed to be "MathIEEE.resource". >>exists? > >If it gets an F-line, it Alert()'s unless you have an F-Line exception >(which is what you are hinting at down below). This is due to the 68881 >being a peripheral processor, and not a "co-processor" on 68000's, 010's, >and 008's. > >>Is there an OS friendly way of inserting exception vectors, rather than >>for example: >> >> LEA MyException, A0 >> MOVE.L A0, FLine_exception_vector >> >>Which would really annoy the Enforcer? > >I believe that this is a case where you will have to annoy Enforcer since >you are mucking with 0 page. How about install your exception handler, then >run Enforcer? ;-) > >>Thanks, >>o| /// Phil Kernick EMail: phil@adam.adelaide.edu.au |o >-- > William J. Coldwell Amiga Attitude Adjuster Cryogenic Software > 3-D Pro | Anim. Station | CA-650 CD-ROM | CMI PA/MPB | Interact AppleTalk > Nexus HD/Aries | CSA 40/4 Magnum | RAMbrandt | Video Blender | DoubleTalk > Internet: billc@cryo.rain.com UUCP: tektronix!percy!cryo!billc A tip: Don't expect the vectors to really be in zeropage... Check the VBR register to see where the vectors really are! -- **************************************************** * I want games that look like Shadow of the Beast * * but play like Leisure Suit Larry. * ****************************************************