1 | 2 | x_unimp.sa 3.3 7/1/91 3 | 4 | fpsp_unimp --- FPSP handler for unimplemented instruction 5 | exception. 6 | 7 | Invoked when the user program encounters a floating-point 8 | op-code that hardware does not support. Trap vector# 11 9 | (See table 8-1 MC68030 User's Manual). 10 | 11 | 12 | Note: An fsave for an unimplemented inst. will create a short 13 | fsave stack. 14 | 15 | Input: 1. Six word stack frame for unimplemented inst, four word 16 | for illegal 17 | (See table 8-7 MC68030 User's Manual). 18 | 2. Unimp (short) fsave state frame created here by fsave 19 | instruction. 20 | 21 | 22 | Copyright (C) Motorola, Inc. 1990 23 | All Rights Reserved 24 | 25 | THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF MOTOROLA 26 | The copyright notice above does not evidence any 27 | actual or intended publication of such source code. 28 29 X_UNIMP: |idnt 2,1 | Motorola 040 Floating Point Software Package 30 31 |section 8 32 33 .include "fpsp.h" 34 35 |xref get_op 36 |xref do_func 37 |xref sto_res 38 |xref gen_except 39 |xref fpsp_fmt_error 40 41 .global fpsp_unimp 42 .global uni_2 43 fpsp_unimp: 44 link %a6,#-LOCAL_SIZE 45 fsave -(%a7) 46 uni_2: 47 moveml %d0-%d1/%a0-%a1,USER_DA(%a6) 48 fmovemx %fp0-%fp3,USER_FP0(%a6) 49 fmoveml %fpcr/%fpsr/%fpiar,USER_FPCR(%a6) 50 moveb (%a7),%d0 |test for valid version num 51 andib #0xf0,%d0 |test for $4x 52 cmpib #VER_4,%d0 |must be $4x or exit 53 bnel fpsp_fmt_error 54 | 55 | Temporary D25B Fix 56 | The following lines are used to ensure that the FPSR 57 | exception byte and condition codes are clear before proceeding 58 | 59 movel USER_FPSR(%a6),%d0 60 andl #0xFF00FF,%d0 |clear all but accrued exceptions 61 movel %d0,USER_FPSR(%a6) 62 fmovel #0,%FPSR |clear all user bits 63 fmovel #0,%FPCR |clear all user exceptions for FPSP 64 65 clrb UFLG_TMP(%a6) |clr flag for unsupp data 66 67 bsrl get_op |go get operand(s) 68 clrb STORE_FLG(%a6) 69 bsrl do_func |do the function 70 fsave -(%a7) |capture possible exc state 71 tstb STORE_FLG(%a6) 72 bnes no_store |if STORE_FLG is set, no store 73 bsrl sto_res |store the result in user space 74 no_store: 75 bral gen_except |post any exceptions and return 76 77 |end