blob: 6f382b21228b68c568e63c8567c7ca27873d78ae [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001|
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|
Matt Waddele00d82d2006-02-11 17:55:48 -080025| For details on the license for this file, please see the
26| file, README, in this same directory.
Linus Torvalds1da177e2005-04-16 15:20:36 -070027
28X_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
42fpsp_unimp:
43 link %a6,#-LOCAL_SIZE
44 fsave -(%a7)
45uni_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
73no_store:
74 bral gen_except |post any exceptions and return
75
76 |end