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| | x_unimp.sa 3.3 7/1/91 | | fpsp_unimp --- FPSP handler for unimplemented instruction | exception. | | Invoked when the user program encounters a floating-point | op-code that hardware does not support. Trap vector# 11 | (See table 8-1 MC68030 User's Manual). | | | Note: An fsave for an unimplemented inst. will create a short | fsave stack. | | Input: 1. Six word stack frame for unimplemented inst, four word | for illegal | (See table 8-7 MC68030 User's Manual). | 2. Unimp (short) fsave state frame created here by fsave | instruction. | | | Copyright (C) Motorola, Inc. 1990 | All Rights Reserved | | THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF MOTOROLA | The copyright notice above does not evidence any | actual or intended publication of such source code. X_UNIMP: |idnt 2,1 | Motorola 040 Floating Point Software Package |section 8 .include "fpsp.h" |xref get_op |xref do_func |xref sto_res |xref gen_except |xref fpsp_fmt_error .global fpsp_unimp .global uni_2 fpsp_unimp: link %a6,#-LOCAL_SIZE fsave -(%a7) uni_2: moveml %d0-%d1/%a0-%a1,USER_DA(%a6) fmovemx %fp0-%fp3,USER_FP0(%a6) fmoveml %fpcr/%fpsr/%fpiar,USER_FPCR(%a6) moveb (%a7),%d0 |test for valid version num andib #0xf0,%d0 |test for $4x cmpib #VER_4,%d0 |must be $4x or exit bnel fpsp_fmt_error | | Temporary D25B Fix | The following lines are used to ensure that the FPSR | exception byte and condition codes are clear before proceeding | movel USER_FPSR(%a6),%d0 andl #0xFF00FF,%d0 |clear all but accrued exceptions movel %d0,USER_FPSR(%a6) fmovel #0,%FPSR |clear all user bits fmovel #0,%FPCR |clear all user exceptions for FPSP clrb UFLG_TMP(%a6) |clr flag for unsupp data bsrl get_op |go get operand(s) clrb STORE_FLG(%a6) bsrl do_func |do the function fsave -(%a7) |capture possible exc state tstb STORE_FLG(%a6) bnes no_store |if STORE_FLG is set, no store bsrl sto_res |store the result in user space no_store: bral gen_except |post any exceptions and return |end |