1*4882a593Smuzhiyun| 2*4882a593Smuzhiyun| x_unimp.sa 3.3 7/1/91 3*4882a593Smuzhiyun| 4*4882a593Smuzhiyun| fpsp_unimp --- FPSP handler for unimplemented instruction 5*4882a593Smuzhiyun| exception. 6*4882a593Smuzhiyun| 7*4882a593Smuzhiyun| Invoked when the user program encounters a floating-point 8*4882a593Smuzhiyun| op-code that hardware does not support. Trap vector# 11 9*4882a593Smuzhiyun| (See table 8-1 MC68030 User's Manual). 10*4882a593Smuzhiyun| 11*4882a593Smuzhiyun| 12*4882a593Smuzhiyun| Note: An fsave for an unimplemented inst. will create a short 13*4882a593Smuzhiyun| fsave stack. 14*4882a593Smuzhiyun| 15*4882a593Smuzhiyun| Input: 1. Six word stack frame for unimplemented inst, four word 16*4882a593Smuzhiyun| for illegal 17*4882a593Smuzhiyun| (See table 8-7 MC68030 User's Manual). 18*4882a593Smuzhiyun| 2. Unimp (short) fsave state frame created here by fsave 19*4882a593Smuzhiyun| instruction. 20*4882a593Smuzhiyun| 21*4882a593Smuzhiyun| 22*4882a593Smuzhiyun| Copyright (C) Motorola, Inc. 1990 23*4882a593Smuzhiyun| All Rights Reserved 24*4882a593Smuzhiyun| 25*4882a593Smuzhiyun| For details on the license for this file, please see the 26*4882a593Smuzhiyun| file, README, in this same directory. 27*4882a593Smuzhiyun 28*4882a593SmuzhiyunX_UNIMP: |idnt 2,1 | Motorola 040 Floating Point Software Package 29*4882a593Smuzhiyun 30*4882a593Smuzhiyun |section 8 31*4882a593Smuzhiyun 32*4882a593Smuzhiyun#include "fpsp.h" 33*4882a593Smuzhiyun 34*4882a593Smuzhiyun |xref get_op 35*4882a593Smuzhiyun |xref do_func 36*4882a593Smuzhiyun |xref sto_res 37*4882a593Smuzhiyun |xref gen_except 38*4882a593Smuzhiyun |xref fpsp_fmt_error 39*4882a593Smuzhiyun 40*4882a593Smuzhiyun .global fpsp_unimp 41*4882a593Smuzhiyun .global uni_2 42*4882a593Smuzhiyunfpsp_unimp: 43*4882a593Smuzhiyun link %a6,#-LOCAL_SIZE 44*4882a593Smuzhiyun fsave -(%a7) 45*4882a593Smuzhiyununi_2: 46*4882a593Smuzhiyun moveml %d0-%d1/%a0-%a1,USER_DA(%a6) 47*4882a593Smuzhiyun fmovemx %fp0-%fp3,USER_FP0(%a6) 48*4882a593Smuzhiyun fmoveml %fpcr/%fpsr/%fpiar,USER_FPCR(%a6) 49*4882a593Smuzhiyun moveb (%a7),%d0 |test for valid version num 50*4882a593Smuzhiyun andib #0xf0,%d0 |test for $4x 51*4882a593Smuzhiyun cmpib #VER_4,%d0 |must be $4x or exit 52*4882a593Smuzhiyun bnel fpsp_fmt_error 53*4882a593Smuzhiyun| 54*4882a593Smuzhiyun| Temporary D25B Fix 55*4882a593Smuzhiyun| The following lines are used to ensure that the FPSR 56*4882a593Smuzhiyun| exception byte and condition codes are clear before proceeding 57*4882a593Smuzhiyun| 58*4882a593Smuzhiyun movel USER_FPSR(%a6),%d0 59*4882a593Smuzhiyun andl #0xFF00FF,%d0 |clear all but accrued exceptions 60*4882a593Smuzhiyun movel %d0,USER_FPSR(%a6) 61*4882a593Smuzhiyun fmovel #0,%FPSR |clear all user bits 62*4882a593Smuzhiyun fmovel #0,%FPCR |clear all user exceptions for FPSP 63*4882a593Smuzhiyun 64*4882a593Smuzhiyun clrb UFLG_TMP(%a6) |clr flag for unsupp data 65*4882a593Smuzhiyun 66*4882a593Smuzhiyun bsrl get_op |go get operand(s) 67*4882a593Smuzhiyun clrb STORE_FLG(%a6) 68*4882a593Smuzhiyun bsrl do_func |do the function 69*4882a593Smuzhiyun fsave -(%a7) |capture possible exc state 70*4882a593Smuzhiyun tstb STORE_FLG(%a6) 71*4882a593Smuzhiyun bnes no_store |if STORE_FLG is set, no store 72*4882a593Smuzhiyun bsrl sto_res |store the result in user space 73*4882a593Smuzhiyunno_store: 74*4882a593Smuzhiyun bral gen_except |post any exceptions and return 75*4882a593Smuzhiyun 76*4882a593Smuzhiyun |end 77