162306a36Sopenharmony_ci| 262306a36Sopenharmony_ci| x_unimp.sa 3.3 7/1/91 362306a36Sopenharmony_ci| 462306a36Sopenharmony_ci| fpsp_unimp --- FPSP handler for unimplemented instruction 562306a36Sopenharmony_ci| exception. 662306a36Sopenharmony_ci| 762306a36Sopenharmony_ci| Invoked when the user program encounters a floating-point 862306a36Sopenharmony_ci| op-code that hardware does not support. Trap vector# 11 962306a36Sopenharmony_ci| (See table 8-1 MC68030 User's Manual). 1062306a36Sopenharmony_ci| 1162306a36Sopenharmony_ci| 1262306a36Sopenharmony_ci| Note: An fsave for an unimplemented inst. will create a short 1362306a36Sopenharmony_ci| fsave stack. 1462306a36Sopenharmony_ci| 1562306a36Sopenharmony_ci| Input: 1. Six word stack frame for unimplemented inst, four word 1662306a36Sopenharmony_ci| for illegal 1762306a36Sopenharmony_ci| (See table 8-7 MC68030 User's Manual). 1862306a36Sopenharmony_ci| 2. Unimp (short) fsave state frame created here by fsave 1962306a36Sopenharmony_ci| instruction. 2062306a36Sopenharmony_ci| 2162306a36Sopenharmony_ci| 2262306a36Sopenharmony_ci| Copyright (C) Motorola, Inc. 1990 2362306a36Sopenharmony_ci| All Rights Reserved 2462306a36Sopenharmony_ci| 2562306a36Sopenharmony_ci| For details on the license for this file, please see the 2662306a36Sopenharmony_ci| file, README, in this same directory. 2762306a36Sopenharmony_ci 2862306a36Sopenharmony_ciX_UNIMP: |idnt 2,1 | Motorola 040 Floating Point Software Package 2962306a36Sopenharmony_ci 3062306a36Sopenharmony_ci |section 8 3162306a36Sopenharmony_ci 3262306a36Sopenharmony_ci#include "fpsp.h" 3362306a36Sopenharmony_ci 3462306a36Sopenharmony_ci |xref get_op 3562306a36Sopenharmony_ci |xref do_func 3662306a36Sopenharmony_ci |xref sto_res 3762306a36Sopenharmony_ci |xref gen_except 3862306a36Sopenharmony_ci |xref fpsp_fmt_error 3962306a36Sopenharmony_ci 4062306a36Sopenharmony_ci .global fpsp_unimp 4162306a36Sopenharmony_ci .global uni_2 4262306a36Sopenharmony_cifpsp_unimp: 4362306a36Sopenharmony_ci link %a6,#-LOCAL_SIZE 4462306a36Sopenharmony_ci fsave -(%a7) 4562306a36Sopenharmony_ciuni_2: 4662306a36Sopenharmony_ci moveml %d0-%d1/%a0-%a1,USER_DA(%a6) 4762306a36Sopenharmony_ci fmovemx %fp0-%fp3,USER_FP0(%a6) 4862306a36Sopenharmony_ci fmoveml %fpcr/%fpsr/%fpiar,USER_FPCR(%a6) 4962306a36Sopenharmony_ci moveb (%a7),%d0 |test for valid version num 5062306a36Sopenharmony_ci andib #0xf0,%d0 |test for $4x 5162306a36Sopenharmony_ci cmpib #VER_4,%d0 |must be $4x or exit 5262306a36Sopenharmony_ci bnel fpsp_fmt_error 5362306a36Sopenharmony_ci| 5462306a36Sopenharmony_ci| Temporary D25B Fix 5562306a36Sopenharmony_ci| The following lines are used to ensure that the FPSR 5662306a36Sopenharmony_ci| exception byte and condition codes are clear before proceeding 5762306a36Sopenharmony_ci| 5862306a36Sopenharmony_ci movel USER_FPSR(%a6),%d0 5962306a36Sopenharmony_ci andl #0xFF00FF,%d0 |clear all but accrued exceptions 6062306a36Sopenharmony_ci movel %d0,USER_FPSR(%a6) 6162306a36Sopenharmony_ci fmovel #0,%FPSR |clear all user bits 6262306a36Sopenharmony_ci fmovel #0,%FPCR |clear all user exceptions for FPSP 6362306a36Sopenharmony_ci 6462306a36Sopenharmony_ci clrb UFLG_TMP(%a6) |clr flag for unsupp data 6562306a36Sopenharmony_ci 6662306a36Sopenharmony_ci bsrl get_op |go get operand(s) 6762306a36Sopenharmony_ci clrb STORE_FLG(%a6) 6862306a36Sopenharmony_ci bsrl do_func |do the function 6962306a36Sopenharmony_ci fsave -(%a7) |capture possible exc state 7062306a36Sopenharmony_ci tstb STORE_FLG(%a6) 7162306a36Sopenharmony_ci bnes no_store |if STORE_FLG is set, no store 7262306a36Sopenharmony_ci bsrl sto_res |store the result in user space 7362306a36Sopenharmony_cino_store: 7462306a36Sopenharmony_ci bral gen_except |post any exceptions and return 7562306a36Sopenharmony_ci 7662306a36Sopenharmony_ci |end 77