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Linus Torvalds1da177e2005-04-16 15:20:36 -07001|
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|
Matt Waddele00d82d2006-02-11 17:55:48 -080026| For details on the license for this file, please see the
27| file, README, in this same directory.
Linus Torvalds1da177e2005-04-16 15:20:36 -070028
29X_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
41fpsp_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|
63unsupp_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
69fmove_con:
70 andl #0x0FFF40FF,%d1 |clear all but cc's, snan bit, aexcs, and qbyte
71end_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