* MOTOROLA MICROPROCESSOR & MEMORY TECHNOLOGY GROUP
* M68000 Hi-Performance Microprocessor Division
* M68040 Software Package
*
* M68040 Software Package Copyright (c) 1993, 1994 Motorola Inc.
* All rights reserved.
*
* THE SOFTWARE is provided on an "AS IS" basis and without warranty.
* To the maximum extent permitted by applicable law,
* MOTOROLA DISCLAIMS ALL WARRANTIES WHETHER EXPRESS OR IMPLIED,
* INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A
* PARTICULAR PURPOSE and any warranty against infringement with
* regard to the SOFTWARE (INCLUDING ANY MODIFIED VERSIONS THEREOF)
* and any accompanying written materials.
*
* To the maximum extent permitted by applicable law,
* IN NO EVENT SHALL MOTOROLA BE LIABLE FOR ANY DAMAGES WHATSOEVER
* (INCLUDING WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSINESS
* PROFITS, BUSINESS INTERRUPTION, LOSS OF BUSINESS INFORMATION, OR
* OTHER PECUNIARY LOSS) ARISING OF THE USE OR INABILITY TO USE THE
* SOFTWARE. Motorola assumes no responsibility for the maintenance
* and support of the SOFTWARE.
*
* You are hereby granted a copyright license to use, modify, and
* distribute the SOFTWARE so long as this entire notice is retained
* without alteration in any modified and/or redistributed versions,
* and that such modified versions are clearly identified as such.
* No licenses are granted by implication, estoppel or otherwise
* under any patents or trademarks of Motorola, Inc.
*
* x_unsupp.sa 3.3 7/1/91
*
* fpsp_unsupp --- FPSP handler for unsupported data type exception
*
* Trap vector #55 (See table 8-1 Mc68030 User's manual).
* Invoked when the user program encounters a data format (packed) that
* hardware does not support or a data type (denormalized numbers or un-
* normalized numbers).
* Normalizes denorms and unnorms, unpacks packed numbers then stores
* them back into the machine to let the 040 finish the operation.
*
* Unsupp calls two routines:
* 1. get_op - gets the operand(s)
* 2. res_func - restore the function back into the 040 or
* if fmove.p fpm,<ea> then pack source (fpm)
* and store in users memory <ea>.
*
* Input: Long fsave stack frame
*
X_UNSUPP IDNT 2,1 Motorola 040 Floating Point Software Package
move.b (a7),VER_TMP(a6) ;save version number
move.b (a7),d0 ;test for valid version num
andi.b #$f0,d0 ;test for $4x
cmpi.b #VER_4,d0 ;must be $4x or exit
bne.l fpsp_fmt_error
fmove.l #0,FPSR ;clear all user status bits
fmove.l #0,FPCR ;clear all user control bits
*
* The following lines are used to ensure that the FPSR
* exception byte and condition codes are clear before proceeding,
* except in the case of fmove, which leaves the cc's intact.
*
unsupp_con:
move.l USER_FPSR(a6),d1
btst #5,CMDREG1B(a6) ;looking for fmove out
bne fmove_con
and.l #$FF00FF,d1 ;clear all but aexcs and qbyte
bra.b end_fix
fmove_con:
and.l #$0FFF40FF,d1 ;clear all but cc's, snan bit, aexcs, and qbyte
end_fix:
move.l d1,USER_FPSR(a6)
st UFLG_TMP(a6) ;set flag for unsupp data
bsr.l get_op ;everything okay, go get operand(s)
bsr.l res_func ;fix up stack frame so can restore it
clr.l -(a7)
move.b VER_TMP(a6),(a7) ;move idle fmt word to top of stack
bra.l gen_except
*
end
