1* $NetBSD: x_unimp.sa,v 1.2 1994/10/26 07:50:32 cgd Exp $ 2 3* MOTOROLA MICROPROCESSOR & MEMORY TECHNOLOGY GROUP 4* M68000 Hi-Performance Microprocessor Division 5* M68040 Software Package 6* 7* M68040 Software Package Copyright (c) 1993, 1994 Motorola Inc. 8* All rights reserved. 9* 10* THE SOFTWARE is provided on an "AS IS" basis and without warranty. 11* To the maximum extent permitted by applicable law, 12* MOTOROLA DISCLAIMS ALL WARRANTIES WHETHER EXPRESS OR IMPLIED, 13* INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A 14* PARTICULAR PURPOSE and any warranty against infringement with 15* regard to the SOFTWARE (INCLUDING ANY MODIFIED VERSIONS THEREOF) 16* and any accompanying written materials. 17* 18* To the maximum extent permitted by applicable law, 19* IN NO EVENT SHALL MOTOROLA BE LIABLE FOR ANY DAMAGES WHATSOEVER 20* (INCLUDING WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSINESS 21* PROFITS, BUSINESS INTERRUPTION, LOSS OF BUSINESS INFORMATION, OR 22* OTHER PECUNIARY LOSS) ARISING OF THE USE OR INABILITY TO USE THE 23* SOFTWARE. Motorola assumes no responsibility for the maintenance 24* and support of the SOFTWARE. 25* 26* You are hereby granted a copyright license to use, modify, and 27* distribute the SOFTWARE so long as this entire notice is retained 28* without alteration in any modified and/or redistributed versions, 29* and that such modified versions are clearly identified as such. 30* No licenses are granted by implication, estoppel or otherwise 31* under any patents or trademarks of Motorola, Inc. 32 33* 34* x_unimp.sa 3.3 7/1/91 35* 36* fpsp_unimp --- FPSP handler for unimplemented instruction 37* exception. 38* 39* Invoked when the user program encounters a floating-point 40* op-code that hardware does not support. Trap vector# 11 41* (See table 8-1 MC68030 User's Manual). 42* 43* 44* Note: An fsave for an unimplemented inst. will create a short 45* fsave stack. 46* 47* Input: 1. Six word stack frame for unimplemented inst, four word 48* for illegal 49* (See table 8-7 MC68030 User's Manual). 50* 2. Unimp (short) fsave state frame created here by fsave 51* instruction. 52* 53 54X_UNIMP IDNT 2,1 Motorola 040 Floating Point Software Package 55 56 section 8 57 58 include fpsp.h 59 60 xref get_op 61 xref do_func 62 xref sto_res 63 xref gen_except 64 xref fpsp_fmt_error 65 66 xdef fpsp_unimp 67 xdef uni_2 68fpsp_unimp: 69 link a6,#-LOCAL_SIZE 70 fsave -(a7) 71uni_2: 72 movem.l d0-d1/a0-a1,USER_DA(a6) 73 fmovem.x fp0-fp3,USER_FP0(a6) 74 fmovem.l fpcr/fpsr/fpiar,USER_FPCR(a6) 75 move.b (a7),d0 ;test for valid version num 76 andi.b #$f0,d0 ;test for $4x 77 cmpi.b #VER_4,d0 ;must be $4x or exit 78 bne.l fpsp_fmt_error 79* 80* Temporary D25B Fix 81* The following lines are used to ensure that the FPSR 82* exception byte and condition codes are clear before proceeding 83* 84 move.l USER_FPSR(a6),d0 85 and.l #$FF00FF,d0 ;clear all but accrued exceptions 86 move.l d0,USER_FPSR(a6) 87 fmove.l #0,FPSR ;clear all user bits 88 fmove.l #0,FPCR ;clear all user exceptions for FPSP 89 90 clr.b UFLG_TMP(a6) ;clr flag for unsupp data 91 92 bsr.l get_op ;go get operand(s) 93 clr.b STORE_FLG(a6) 94 bsr.l do_func ;do the function 95 fsave -(a7) ;capture possible exc state 96 tst.b STORE_FLG(a6) 97 bne.b no_store ;if STORE_FLG is set, no store 98 bsr.l sto_res ;store the result in user space 99no_store: 100 bra.l gen_except ;post any exceptions and return 101 102 end 103