1 | 1 |
2 | x_unimp.sa 3.3 7/1/91 2 | x_unimp.sa 3.3 7/1/91
3 | 3 |
4 | fpsp_unimp --- FPSP handler for unimpl 4 | fpsp_unimp --- FPSP handler for unimplemented instruction
5 | exception. 5 | exception.
6 | 6 |
7 | Invoked when the user program encounters a f 7 | Invoked when the user program encounters a floating-point
8 | op-code that hardware does not support. Tra 8 | op-code that hardware does not support. Trap vector# 11
9 | (See table 8-1 MC68030 User's Manual). 9 | (See table 8-1 MC68030 User's Manual).
10 | 10 |
11 | 11 |
12 | Note: An fsave for an unimplemented inst. wi 12 | Note: An fsave for an unimplemented inst. will create a short
13 | fsave stack. 13 | fsave stack.
14 | 14 |
15 | Input: 1. Six word stack frame for unimplem 15 | Input: 1. Six word stack frame for unimplemented inst, four word
16 | for illegal 16 | for illegal
17 | (See table 8-7 MC68030 User's Man 17 | (See table 8-7 MC68030 User's Manual).
18 | 2. Unimp (short) fsave state frame c 18 | 2. Unimp (short) fsave state frame created here by fsave
19 | instruction. 19 | instruction.
20 | 20 |
21 | 21 |
22 | Copyright (C) Motorola, Inc. 1 22 | Copyright (C) Motorola, Inc. 1990
23 | All Rights Reserved 23 | All Rights Reserved
24 | 24 |
25 | For details on the license for this fi 25 | For details on the license for this file, please see the
26 | file, README, in this same directory. 26 | file, README, in this same directory.
27 27
28 X_UNIMP: |idnt 2,1 | Motorola 040 Fl 28 X_UNIMP: |idnt 2,1 | Motorola 040 Floating Point Software Package
29 29
30 |section 8 30 |section 8
31 31
32 #include "fpsp.h" 32 #include "fpsp.h"
33 33
34 |xref get_op 34 |xref get_op
35 |xref do_func 35 |xref do_func
36 |xref sto_res 36 |xref sto_res
37 |xref gen_except 37 |xref gen_except
38 |xref fpsp_fmt_error 38 |xref fpsp_fmt_error
39 39
40 .global fpsp_unimp 40 .global fpsp_unimp
41 .global uni_2 41 .global uni_2
42 fpsp_unimp: 42 fpsp_unimp:
43 link %a6,#-LOCAL_SIZE 43 link %a6,#-LOCAL_SIZE
44 fsave -(%a7) 44 fsave -(%a7)
45 uni_2: 45 uni_2:
46 moveml %d0-%d1/%a0-%a1,USER_D 46 moveml %d0-%d1/%a0-%a1,USER_DA(%a6)
47 fmovemx %fp0-%fp3,USER_FP0(%a6) 47 fmovemx %fp0-%fp3,USER_FP0(%a6)
48 fmoveml %fpcr/%fpsr/%fpiar,USER_FPCR(% 48 fmoveml %fpcr/%fpsr/%fpiar,USER_FPCR(%a6)
49 moveb (%a7),%d0 49 moveb (%a7),%d0 |test for valid version num
50 andib #0xf0,%d0 50 andib #0xf0,%d0 |test for $4x
51 cmpib #VER_4,%d0 |must 51 cmpib #VER_4,%d0 |must be $4x or exit
52 bnel fpsp_fmt_error 52 bnel fpsp_fmt_error
53 | 53 |
54 | Temporary D25B Fix 54 | Temporary D25B Fix
55 | The following lines are used to ensure 55 | The following lines are used to ensure that the FPSR
56 | exception byte and condition codes are 56 | exception byte and condition codes are clear before proceeding
57 | 57 |
58 movel USER_FPSR(%a6),%d0 58 movel USER_FPSR(%a6),%d0
59 andl #0xFF00FF,%d0 |clear 59 andl #0xFF00FF,%d0 |clear all but accrued exceptions
60 movel %d0,USER_FPSR(%a6) 60 movel %d0,USER_FPSR(%a6)
61 fmovel #0,%FPSR |clear all us 61 fmovel #0,%FPSR |clear all user bits
62 fmovel #0,%FPCR |clear 62 fmovel #0,%FPCR |clear all user exceptions for FPSP
63 63
64 clrb UFLG_TMP(%a6) |clr f 64 clrb UFLG_TMP(%a6) |clr flag for unsupp data
65 65
66 bsrl get_op |go ge 66 bsrl get_op |go get operand(s)
67 clrb STORE_FLG(%a6) 67 clrb STORE_FLG(%a6)
68 bsrl do_func |do th 68 bsrl do_func |do the function
69 fsave -(%a7) |captu 69 fsave -(%a7) |capture possible exc state
70 tstb STORE_FLG(%a6) 70 tstb STORE_FLG(%a6)
71 bnes no_store |if ST 71 bnes no_store |if STORE_FLG is set, no store
72 bsrl sto_res |store 72 bsrl sto_res |store the result in user space
73 no_store: 73 no_store:
74 bral gen_except |post 74 bral gen_except |post any exceptions and return
75 75
76 |end 76 |end
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