| | | |
| | x_unsupp.sa 3.3 7/1/91 | |
| | | |
| | fpsp_unsupp --- FPSP handler for unsupported data type exception | |
| | | |
| | Trap vector #55 (See table 8-1 Mc68030 User's manual). | |
| | Invoked when the user program encounters a data format (packed) that | |
| | hardware does not support or a data type (denormalized numbers or un- | |
| | normalized numbers). | |
| | Normalizes denorms and unnorms, unpacks packed numbers then stores | |
| | them back into the machine to let the 040 finish the operation. | |
| | | |
| | Unsupp calls two routines: | |
| | 1. get_op - gets the operand(s) | |
| | 2. res_func - restore the function back into the 040 or | |
| | if fmove.p fpm,<ea> then pack source (fpm) | |
| | and store in users memory <ea>. | |
| | | |
| | Input: Long fsave stack frame | |
| | | |
| | | |
| | Copyright (C) Motorola, Inc. 1990 | |
| | All Rights Reserved | |
| | | |
| | For details on the license for this file, please see the | |
| | file, README, in this same directory. | |
| X_UNSUPP: |idnt 2,1 | Motorola 040 Floating Point Software Package | |
| |section 8 | |
| #include "fpsp.h" | |
| |xref get_op | |
| |xref res_func | |
| |xref gen_except | |
| |xref fpsp_fmt_error | |
| .global fpsp_unsupp | |
| fpsp_unsupp: | |
| | | |
| link %a6,#-LOCAL_SIZE | |
| fsave -(%a7) | |
| moveml %d0-%d1/%a0-%a1,USER_DA(%a6) | |
| fmovemx %fp0-%fp3,USER_FP0(%a6) | |
| fmoveml %fpcr/%fpsr/%fpiar,USER_FPCR(%a6) | |
| moveb (%a7),VER_TMP(%a6) |save version number | |
| 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 | |
| fmovel #0,%FPSR |clear all user status bits | |
| fmovel #0,%FPCR |clear all user control bits | |
| | | |
| | The following lines are used to ensure that the FPSR | |
| | exception byte and condition codes are clear before proceeding, | |
| | except in the case of fmove, which leaves the cc's intact. | |
| | | |
| unsupp_con: | |
| movel USER_FPSR(%a6),%d1 | |
| btst #5,CMDREG1B(%a6) |looking for fmove out | |
| bne fmove_con | |
| andl #0xFF00FF,%d1 |clear all but aexcs and qbyte | |
| bras end_fix | |
| fmove_con: | |
| andl #0x0FFF40FF,%d1 |clear all but cc's, snan bit, aexcs, and qbyte | |
| end_fix: | |
| movel %d1,USER_FPSR(%a6) | |
| st UFLG_TMP(%a6) |set flag for unsupp data | |
| bsrl get_op |everything okay, go get operand(s) | |
| bsrl res_func |fix up stack frame so can restore it | |
| clrl -(%a7) | |
| moveb VER_TMP(%a6),(%a7) |move idle fmt word to top of stack | |
| bral gen_except | |
| | | |
| |end |