106 lines
3.4 KiB
Plaintext
106 lines
3.4 KiB
Plaintext
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* MOTOROLA MICROPROCESSOR & MEMORY TECHNOLOGY GROUP
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* M68000 Hi-Performance Microprocessor Division
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* M68040 Software Package
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*
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* M68040 Software Package Copyright (c) 1993, 1994 Motorola Inc.
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* All rights reserved.
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*
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* THE SOFTWARE is provided on an "AS IS" basis and without warranty.
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* To the maximum extent permitted by applicable law,
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* MOTOROLA DISCLAIMS ALL WARRANTIES WHETHER EXPRESS OR IMPLIED,
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* INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A
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* PARTICULAR PURPOSE and any warranty against infringement with
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* regard to the SOFTWARE (INCLUDING ANY MODIFIED VERSIONS THEREOF)
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* and any accompanying written materials.
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*
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* To the maximum extent permitted by applicable law,
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* IN NO EVENT SHALL MOTOROLA BE LIABLE FOR ANY DAMAGES WHATSOEVER
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* (INCLUDING WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSINESS
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* PROFITS, BUSINESS INTERRUPTION, LOSS OF BUSINESS INFORMATION, OR
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* OTHER PECUNIARY LOSS) ARISING OF THE USE OR INABILITY TO USE THE
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* SOFTWARE. Motorola assumes no responsibility for the maintenance
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* and support of the SOFTWARE.
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*
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* You are hereby granted a copyright license to use, modify, and
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* distribute the SOFTWARE so long as this entire notice is retained
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* without alteration in any modified and/or redistributed versions,
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* and that such modified versions are clearly identified as such.
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* No licenses are granted by implication, estoppel or otherwise
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* under any patents or trademarks of Motorola, Inc.
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*
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* x_unsupp.sa 3.3 7/1/91
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*
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* fpsp_unsupp --- FPSP handler for unsupported data type exception
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*
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* Trap vector #55 (See table 8-1 Mc68030 User's manual).
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* Invoked when the user program encounters a data format (packed) that
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* hardware does not support or a data type (denormalized numbers or un-
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* normalized numbers).
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* Normalizes denorms and unnorms, unpacks packed numbers then stores
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* them back into the machine to let the 040 finish the operation.
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*
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* Unsupp calls two routines:
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* 1. get_op - gets the operand(s)
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* 2. res_func - restore the function back into the 040 or
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* if fmove.p fpm,<ea> then pack source (fpm)
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* and store in users memory <ea>.
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*
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* Input: Long fsave stack frame
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*
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X_UNSUPP IDNT 2,1 Motorola 040 Floating Point Software Package
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section 8
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include fpsp.h
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xref get_op
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xref res_func
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xref gen_except
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xref fpsp_fmt_error
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xdef fpsp_unsupp
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fpsp_unsupp:
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*
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link a6,#-LOCAL_SIZE
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fsave -(a7)
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movem.l d0-d1/a0-a1,USER_DA(a6)
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fmovem.x fp0-fp3,USER_FP0(a6)
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fmovem.l fpcr/fpsr/fpiar,USER_FPCR(a6)
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move.b (a7),VER_TMP(a6) ;save version number
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move.b (a7),d0 ;test for valid version num
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andi.b #$f0,d0 ;test for $4x
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cmpi.b #VER_4,d0 ;must be $4x or exit
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bne.l fpsp_fmt_error
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fmove.l #0,FPSR ;clear all user status bits
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fmove.l #0,FPCR ;clear all user control bits
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*
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* The following lines are used to ensure that the FPSR
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* exception byte and condition codes are clear before proceeding,
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* except in the case of fmove, which leaves the cc's intact.
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*
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unsupp_con:
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move.l USER_FPSR(a6),d1
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btst #5,CMDREG1B(a6) ;looking for fmove out
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bne fmove_con
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and.l #$FF00FF,d1 ;clear all but aexcs and qbyte
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bra.b end_fix
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fmove_con:
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and.l #$0FFF40FF,d1 ;clear all but cc's, snan bit, aexcs, and qbyte
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end_fix:
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move.l d1,USER_FPSR(a6)
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st UFLG_TMP(a6) ;set flag for unsupp data
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bsr.l get_op ;everything okay, go get operand(s)
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bsr.l res_func ;fix up stack frame so can restore it
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clr.l -(a7)
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move.b VER_TMP(a6),(a7) ;move idle fmt word to top of stack
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bra.l gen_except
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*
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end
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