x_unsupp.sa revision 1.1
1 * MOTOROLA MICROPROCESSOR & MEMORY TECHNOLOGY GROUP 2 * M68000 Hi-Performance Microprocessor Division 3 * M68040 Software Package 4 * 5 * M68040 Software Package Copyright (c) 1993, 1994 Motorola Inc. 6 * All rights reserved. 7 * 8 * THE SOFTWARE is provided on an "AS IS" basis and without warranty. 9 * To the maximum extent permitted by applicable law, 10 * MOTOROLA DISCLAIMS ALL WARRANTIES WHETHER EXPRESS OR IMPLIED, 11 * INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A 12 * PARTICULAR PURPOSE and any warranty against infringement with 13 * regard to the SOFTWARE (INCLUDING ANY MODIFIED VERSIONS THEREOF) 14 * and any accompanying written materials. 15 * 16 * To the maximum extent permitted by applicable law, 17 * IN NO EVENT SHALL MOTOROLA BE LIABLE FOR ANY DAMAGES WHATSOEVER 18 * (INCLUDING WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSINESS 19 * PROFITS, BUSINESS INTERRUPTION, LOSS OF BUSINESS INFORMATION, OR 20 * OTHER PECUNIARY LOSS) ARISING OF THE USE OR INABILITY TO USE THE 21 * SOFTWARE. Motorola assumes no responsibility for the maintenance 22 * and support of the SOFTWARE. 23 * 24 * You are hereby granted a copyright license to use, modify, and 25 * distribute the SOFTWARE so long as this entire notice is retained 26 * without alteration in any modified and/or redistributed versions, 27 * and that such modified versions are clearly identified as such. 28 * No licenses are granted by implication, estoppel or otherwise 29 * under any patents or trademarks of Motorola, Inc. 30 31 * 32 * x_unsupp.sa 3.3 7/1/91 33 * 34 * fpsp_unsupp --- FPSP handler for unsupported data type exception 35 * 36 * Trap vector #55 (See table 8-1 Mc68030 User's manual). 37 * Invoked when the user program encounters a data format (packed) that 38 * hardware does not support or a data type (denormalized numbers or un- 39 * normalized numbers). 40 * Normalizes denorms and unnorms, unpacks packed numbers then stores 41 * them back into the machine to let the 040 finish the operation. 42 * 43 * Unsupp calls two routines: 44 * 1. get_op - gets the operand(s) 45 * 2. res_func - restore the function back into the 040 or 46 * if fmove.p fpm,<ea> then pack source (fpm) 47 * and store in users memory <ea>. 48 * 49 * Input: Long fsave stack frame 50 * 51 52 X_UNSUPP IDNT 2,1 Motorola 040 Floating Point Software Package 53 54 section 8 55 56 include fpsp.h 57 58 xref get_op 59 xref res_func 60 xref gen_except 61 xref fpsp_fmt_error 62 63 xdef fpsp_unsupp 64 fpsp_unsupp: 65 * 66 link a6,#-LOCAL_SIZE 67 fsave -(a7) 68 movem.l d0-d1/a0-a1,USER_DA(a6) 69 fmovem.x fp0-fp3,USER_FP0(a6) 70 fmovem.l fpcr/fpsr/fpiar,USER_FPCR(a6) 71 72 73 move.b (a7),VER_TMP(a6) ;save version number 74 move.b (a7),d0 ;test for valid version num 75 andi.b #$f0,d0 ;test for $4x 76 cmpi.b #VER_4,d0 ;must be $4x or exit 77 bne.l fpsp_fmt_error 78 79 fmove.l #0,FPSR ;clear all user status bits 80 fmove.l #0,FPCR ;clear all user control bits 81 * 82 * The following lines are used to ensure that the FPSR 83 * exception byte and condition codes are clear before proceeding, 84 * except in the case of fmove, which leaves the cc's intact. 85 * 86 unsupp_con: 87 move.l USER_FPSR(a6),d1 88 btst #5,CMDREG1B(a6) ;looking for fmove out 89 bne fmove_con 90 and.l #$FF00FF,d1 ;clear all but aexcs and qbyte 91 bra.b end_fix 92 fmove_con: 93 and.l #$0FFF40FF,d1 ;clear all but cc's, snan bit, aexcs, and qbyte 94 end_fix: 95 move.l d1,USER_FPSR(a6) 96 97 st UFLG_TMP(a6) ;set flag for unsupp data 98 99 bsr.l get_op ;everything okay, go get operand(s) 100 bsr.l res_func ;fix up stack frame so can restore it 101 clr.l -(a7) 102 move.b VER_TMP(a6),(a7) ;move idle fmt word to top of stack 103 bra.l gen_except 104 * 105 end 106
Indexes created Tue Oct 28 07:09:57 GMT 2025