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* $NetBSD: x_unimp.sa,v 1.2 1994/10/26 07:50:32 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_unimp.sa 3.3 7/1/91
*
* fpsp_unimp --- FPSP handler for unimplemented instruction
* exception.
*
* Invoked when the user program encounters a floating-point
* op-code that hardware does not support. Trap vector# 11
* (See table 8-1 MC68030 User's Manual).
*
*
* Note: An fsave for an unimplemented inst. will create a short
* fsave stack.
*
* Input: 1. Six word stack frame for unimplemented inst, four word
* for illegal
* (See table 8-7 MC68030 User's Manual).
* 2. Unimp (short) fsave state frame created here by fsave
* instruction.
*
X_UNIMP IDNT 2,1 Motorola 040 Floating Point Software Package
section 8
include fpsp.h
xref get_op
xref do_func
xref sto_res
xref gen_except
xref fpsp_fmt_error
xdef fpsp_unimp
xdef uni_2
fpsp_unimp:
link a6,#-LOCAL_SIZE
fsave -(a7)
uni_2:
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),d0 ;test for valid version num
andi.b #$f0,d0 ;test for $4x
cmpi.b #VER_4,d0 ;must be $4x or exit
bne.l fpsp_fmt_error
*
* Temporary D25B Fix
* The following lines are used to ensure that the FPSR
* exception byte and condition codes are clear before proceeding
*
move.l USER_FPSR(a6),d0
and.l #$FF00FF,d0 ;clear all but accrued exceptions
move.l d0,USER_FPSR(a6)
fmove.l #0,FPSR ;clear all user bits
fmove.l #0,FPCR ;clear all user exceptions for FPSP
clr.b UFLG_TMP(a6) ;clr flag for unsupp data
bsr.l get_op ;go get operand(s)
clr.b STORE_FLG(a6)
bsr.l do_func ;do the function
fsave -(a7) ;capture possible exc state
tst.b STORE_FLG(a6)
bne.b no_store ;if STORE_FLG is set, no store
bsr.l sto_res ;store the result in user space
no_store:
bra.l gen_except ;post any exceptions and return
end
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