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1da177e4 LT |
1 | | |
2 | | x_unimp.sa 3.3 7/1/91 | |
3 | | | |
4 | | fpsp_unimp --- FPSP handler for unimplemented instruction | |
5 | | exception. | |
6 | | | |
7 | | Invoked when the user program encounters a floating-point | |
8 | | op-code that hardware does not support. Trap vector# 11 | |
9 | | (See table 8-1 MC68030 User's Manual). | |
10 | | | |
11 | | | |
12 | | Note: An fsave for an unimplemented inst. will create a short | |
13 | | fsave stack. | |
14 | | | |
15 | | Input: 1. Six word stack frame for unimplemented inst, four word | |
16 | | for illegal | |
17 | | (See table 8-7 MC68030 User's Manual). | |
18 | | 2. Unimp (short) fsave state frame created here by fsave | |
19 | | instruction. | |
20 | | | |
21 | | | |
22 | | Copyright (C) Motorola, Inc. 1990 | |
23 | | All Rights Reserved | |
24 | | | |
e00d82d0 MW |
25 | | For details on the license for this file, please see the |
26 | | file, README, in this same directory. | |
1da177e4 LT |
27 | |
28 | X_UNIMP: |idnt 2,1 | Motorola 040 Floating Point Software Package | |
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_DA(%a6) | |
47 | fmovemx %fp0-%fp3,USER_FP0(%a6) | |
48 | fmoveml %fpcr/%fpsr/%fpiar,USER_FPCR(%a6) | |
49 | moveb (%a7),%d0 |test for valid version num | |
50 | andib #0xf0,%d0 |test for $4x | |
51 | cmpib #VER_4,%d0 |must be $4x or exit | |
52 | bnel fpsp_fmt_error | |
53 | | | |
54 | | Temporary D25B Fix | |
55 | | The following lines are used to ensure that the FPSR | |
56 | | exception byte and condition codes are clear before proceeding | |
57 | | | |
58 | movel USER_FPSR(%a6),%d0 | |
59 | andl #0xFF00FF,%d0 |clear all but accrued exceptions | |
60 | movel %d0,USER_FPSR(%a6) | |
61 | fmovel #0,%FPSR |clear all user bits | |
62 | fmovel #0,%FPCR |clear all user exceptions for FPSP | |
63 | ||
64 | clrb UFLG_TMP(%a6) |clr flag for unsupp data | |
65 | ||
66 | bsrl get_op |go get operand(s) | |
67 | clrb STORE_FLG(%a6) | |
68 | bsrl do_func |do the function | |
69 | fsave -(%a7) |capture possible exc state | |
70 | tstb STORE_FLG(%a6) | |
71 | bnes no_store |if STORE_FLG is set, no store | |
72 | bsrl sto_res |store the result in user space | |
73 | no_store: | |
74 | bral gen_except |post any exceptions and return | |
75 | ||
76 | |end |