1 |
2 | x_unsupp.sa 3.3 7/1/91
3 |
4 | fpsp_unsupp --- FPSP handler for unsup
5 |
6 | Trap vector #55 (See table 8-1 Mc68030
7 | Invoked when the user program encounters a d
8 | hardware does not support or a data type (de
9 | normalized numbers).
10 | Normalizes denorms and unnorms, unpacks pack
11 | them back into the machine to let the 040 fi
12 |
13 | Unsupp calls two routines:
14 | 1. get_op - gets the operand(s)
15 | 2. res_func - restore the function bac
16 | if fmove.p fpm,<ea> th
17 | and store in users mem
18 |
19 | Input: Long fsave stack frame
20 |
21 |
22
23 | Copyright (C) Motorola, Inc. 1
24 | All Rights Reserved
25 |
26 | For details on the license for this fi
27 | file, README, in this same directory.
28
29 X_UNSUPP: |idnt 2,1 | Motorola 040 Fl
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_D
46 fmovemx %fp0-%fp3,USER_FP0(%a6)
47 fmoveml %fpcr/%fpsr/%fpiar,USER_FPCR(%
48
49
50 moveb (%a7),VER_TMP(%a6) |sa
51 moveb (%a7),%d0
52 andib #0xf0,%d0
53 cmpib #VER_4,%d0 |must
54 bnel fpsp_fmt_error
55
56 fmovel #0,%FPSR
57 fmovel #0,%FPCR
58 |
59 | The following lines are used to ensure
60 | exception byte and condition codes are
61 | except in the case of fmove, which lea
62 |
63 unsupp_con:
64 movel USER_FPSR(%a6),%d1
65 btst #5,CMDREG1B(%a6)
66 bne fmove_con
67 andl #0xFF00FF,%d1 |clear
68 bras end_fix
69 fmove_con:
70 andl #0x0FFF40FF,%d1 |clear
71 end_fix:
72 movel %d1,USER_FPSR(%a6)
73
74 st UFLG_TMP(%a6) |set f
75
76 bsrl get_op |every
77 bsrl res_func |fix u
78 clrl -(%a7)
79 moveb VER_TMP(%a6),(%a7) |mo
80 bral gen_except
81 |
82 |end
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