Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | | |
2 | | x_unsupp.sa 3.3 7/1/91 | |
3 | | | |
4 | | fpsp_unsupp --- FPSP handler for unsupported data type exception | |
5 | | | |
6 | | Trap vector #55 (See table 8-1 Mc68030 User's manual). | |
7 | | Invoked when the user program encounters a data format (packed) that | |
8 | | hardware does not support or a data type (denormalized numbers or un- | |
9 | | normalized numbers). | |
10 | | Normalizes denorms and unnorms, unpacks packed numbers then stores | |
11 | | them back into the machine to let the 040 finish the operation. | |
12 | | | |
13 | | Unsupp calls two routines: | |
14 | | 1. get_op - gets the operand(s) | |
15 | | 2. res_func - restore the function back into the 040 or | |
16 | | if fmove.p fpm,<ea> then pack source (fpm) | |
17 | | and store in users memory <ea>. | |
18 | | | |
19 | | Input: Long fsave stack frame | |
20 | | | |
21 | | | |
22 | ||
23 | | Copyright (C) Motorola, Inc. 1990 | |
24 | | All Rights Reserved | |
25 | | | |
e00d82d0 MW |
26 | | For details on the license for this file, please see the |
27 | | file, README, in this same directory. | |
1da177e4 LT |
28 | |
29 | X_UNSUPP: |idnt 2,1 | Motorola 040 Floating Point Software Package | |
30 | ||
31 | |section 8 | |
32 | ||
33 | #include "fpsp.h" | |
34 | ||
35 | |xref get_op | |
36 | |xref res_func | |
37 | |xref gen_except | |
38 | |xref fpsp_fmt_error | |
39 | ||
40 | .global fpsp_unsupp | |
41 | fpsp_unsupp: | |
42 | | | |
43 | link %a6,#-LOCAL_SIZE | |
44 | fsave -(%a7) | |
45 | moveml %d0-%d1/%a0-%a1,USER_DA(%a6) | |
46 | fmovemx %fp0-%fp3,USER_FP0(%a6) | |
47 | fmoveml %fpcr/%fpsr/%fpiar,USER_FPCR(%a6) | |
48 | ||
49 | ||
50 | moveb (%a7),VER_TMP(%a6) |save version number | |
51 | moveb (%a7),%d0 |test for valid version num | |
52 | andib #0xf0,%d0 |test for $4x | |
53 | cmpib #VER_4,%d0 |must be $4x or exit | |
54 | bnel fpsp_fmt_error | |
55 | ||
56 | fmovel #0,%FPSR |clear all user status bits | |
57 | fmovel #0,%FPCR |clear all user control bits | |
58 | | | |
59 | | The following lines are used to ensure that the FPSR | |
60 | | exception byte and condition codes are clear before proceeding, | |
61 | | except in the case of fmove, which leaves the cc's intact. | |
62 | | | |
63 | unsupp_con: | |
64 | movel USER_FPSR(%a6),%d1 | |
65 | btst #5,CMDREG1B(%a6) |looking for fmove out | |
66 | bne fmove_con | |
67 | andl #0xFF00FF,%d1 |clear all but aexcs and qbyte | |
68 | bras end_fix | |
69 | fmove_con: | |
70 | andl #0x0FFF40FF,%d1 |clear all but cc's, snan bit, aexcs, and qbyte | |
71 | end_fix: | |
72 | movel %d1,USER_FPSR(%a6) | |
73 | ||
74 | st UFLG_TMP(%a6) |set flag for unsupp data | |
75 | ||
76 | bsrl get_op |everything okay, go get operand(s) | |
77 | bsrl res_func |fix up stack frame so can restore it | |
78 | clrl -(%a7) | |
79 | moveb VER_TMP(%a6),(%a7) |move idle fmt word to top of stack | |
80 | bral gen_except | |
81 | | | |
82 | |end |