1 |
2 | x_unimp.sa 3.3 7/1/91
3 |
4 | fpsp_unimp --- FPSP handler for unimpl
5 | exception.
6 |
7 | Invoked when the user program encounters a f
8 | op-code that hardware does not support. Tra
9 | (See table 8-1 MC68030 User's Manual).
10 |
11 |
12 | Note: An fsave for an unimplemented inst. wi
13 | fsave stack.
14 |
15 | Input: 1. Six word stack frame for unimplem
16 | for illegal
17 | (See table 8-7 MC68030 User's Man
18 | 2. Unimp (short) fsave state frame c
19 | instruction.
20 |
21 |
22 | Copyright (C) Motorola, Inc. 1
23 | All Rights Reserved
24 |
25 | For details on the license for this fi
26 | file, README, in this same directory.
27
28 X_UNIMP: |idnt 2,1 | Motorola 040 Fl
29
30 |section 8
31
32 #include "fpsp.h"
33
34 |xref get_op
35 |xref do_func
36 |xref sto_res
37 |xref gen_except
38 |xref fpsp_fmt_error
39
40 .global fpsp_unimp
41 .global uni_2
42 fpsp_unimp:
43 link %a6,#-LOCAL_SIZE
44 fsave -(%a7)
45 uni_2:
46 moveml %d0-%d1/%a0-%a1,USER_D
47 fmovemx %fp0-%fp3,USER_FP0(%a6)
48 fmoveml %fpcr/%fpsr/%fpiar,USER_FPCR(%
49 moveb (%a7),%d0
50 andib #0xf0,%d0
51 cmpib #VER_4,%d0 |must
52 bnel fpsp_fmt_error
53 |
54 | Temporary D25B Fix
55 | The following lines are used to ensure
56 | exception byte and condition codes are
57 |
58 movel USER_FPSR(%a6),%d0
59 andl #0xFF00FF,%d0 |clear
60 movel %d0,USER_FPSR(%a6)
61 fmovel #0,%FPSR |clear all us
62 fmovel #0,%FPCR |clear
63
64 clrb UFLG_TMP(%a6) |clr f
65
66 bsrl get_op |go ge
67 clrb STORE_FLG(%a6)
68 bsrl do_func |do th
69 fsave -(%a7) |captu
70 tstb STORE_FLG(%a6)
71 bnes no_store |if ST
72 bsrl sto_res |store
73 no_store:
74 bral gen_except |post
75
76 |end
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