108 lines
3.5 KiB
Plaintext
108 lines
3.5 KiB
Plaintext
* $NetBSD: x_unsupp.sa,v 1.2 1994/10/26 07:50:33 cgd Exp $
|
|
|
|
* 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
|
|
|
|
section 8
|
|
|
|
include fpsp.h
|
|
|
|
xref get_op
|
|
xref res_func
|
|
xref gen_except
|
|
xref fpsp_fmt_error
|
|
|
|
xdef fpsp_unsupp
|
|
fpsp_unsupp:
|
|
*
|
|
link a6,#-LOCAL_SIZE
|
|
fsave -(a7)
|
|
movem.l d0-d1/a0-a1,USER_DA(a6)
|
|
fmovem.x fp0-fp3,USER_FP0(a6)
|
|
fmovem.l fpcr/fpsr/fpiar,USER_FPCR(a6)
|
|
|
|
|
|
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
|