| | |
| | 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 |
