103 lines
3.2 KiB
Plaintext
103 lines
3.2 KiB
Plaintext
* $NetBSD: x_unimp.sa,v 1.2 1994/10/26 07:50:32 cgd Exp $
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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_unimp.sa 3.3 7/1/91
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*
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* fpsp_unimp --- FPSP handler for unimplemented instruction
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* exception.
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*
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* Invoked when the user program encounters a floating-point
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* op-code that hardware does not support. Trap vector# 11
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* (See table 8-1 MC68030 User's Manual).
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*
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*
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* Note: An fsave for an unimplemented inst. will create a short
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* fsave stack.
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*
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* Input: 1. Six word stack frame for unimplemented inst, four word
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* for illegal
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* (See table 8-7 MC68030 User's Manual).
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* 2. Unimp (short) fsave state frame created here by fsave
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* instruction.
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*
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X_UNIMP 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 do_func
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xref sto_res
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xref gen_except
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xref fpsp_fmt_error
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xdef fpsp_unimp
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xdef uni_2
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fpsp_unimp:
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link a6,#-LOCAL_SIZE
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fsave -(a7)
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uni_2:
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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),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 $4x or exit
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bne.l fpsp_fmt_error
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*
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* Temporary D25B Fix
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* The following lines are used to ensure that the FPSR
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* exception byte and condition codes are clear before proceeding
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*
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move.l USER_FPSR(a6),d0
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and.l #$FF00FF,d0 ;clear all but accrued exceptions
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move.l d0,USER_FPSR(a6)
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fmove.l #0,FPSR ;clear all user bits
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fmove.l #0,FPCR ;clear all user exceptions for FPSP
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clr.b UFLG_TMP(a6) ;clr flag for unsupp data
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bsr.l get_op ;go get operand(s)
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clr.b STORE_FLG(a6)
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bsr.l do_func ;do the function
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fsave -(a7) ;capture possible exc state
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tst.b STORE_FLG(a6)
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bne.b no_store ;if STORE_FLG is set, no store
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bsr.l sto_res ;store the result in user space
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no_store:
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bra.l gen_except ;post any exceptions and return
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end
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