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|
|       x_unimp.sa 3.3 7/1/91
|
|       fpsp_unimp --- FPSP handler for unimplemented instruction
|       exception.
|
| Invoked when the user program encounters a floating-point
| op-code that hardware does not support.  Trap vector# 11
| (See table 8-1 MC68030 User's Manual).
|
|
| Note: An fsave for an unimplemented inst. will create a short
| fsave stack.
|
|  Input: 1. Six word stack frame for unimplemented inst, four word
|            for illegal
|            (See table 8-7 MC68030 User's Manual).
|         2. Unimp (short) fsave state frame created here by fsave
|            instruction.
|
|
|               Copyright (C) Motorola, Inc. 1990
|                       All Rights Reserved
|
|       THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF MOTOROLA
|       The copyright notice above does not evidence any
|       actual or intended publication of such source code.
 
X_UNIMP:        |idnt    2,1 | Motorola 040 Floating Point Software Package
 
        |section        8
 
        .include "fpsp.h"
 
        |xref   get_op
        |xref   do_func
        |xref   sto_res
        |xref   gen_except
        |xref   fpsp_fmt_error
 
        .global fpsp_unimp
        .global uni_2
fpsp_unimp:
        link            %a6,#-LOCAL_SIZE
        fsave           -(%a7)
uni_2:
        moveml          %d0-%d1/%a0-%a1,USER_DA(%a6)
        fmovemx %fp0-%fp3,USER_FP0(%a6)
        fmoveml %fpcr/%fpsr/%fpiar,USER_FPCR(%a6)
        moveb           (%a7),%d0               |test for valid version num
        andib           #0xf0,%d0               |test for $4x
        cmpib           #VER_4,%d0      |must be $4x or exit
        bnel            fpsp_fmt_error
|
|       Temporary D25B Fix
|       The following lines are used to ensure that the FPSR
|       exception byte and condition codes are clear before proceeding
|
        movel           USER_FPSR(%a6),%d0
        andl            #0xFF00FF,%d0   |clear all but accrued exceptions
        movel           %d0,USER_FPSR(%a6)
        fmovel          #0,%FPSR |clear all user bits
        fmovel          #0,%FPCR        |clear all user exceptions for FPSP
 
        clrb            UFLG_TMP(%a6)   |clr flag for unsupp data
 
        bsrl            get_op          |go get operand(s)
        clrb            STORE_FLG(%a6)
        bsrl            do_func         |do the function
        fsave           -(%a7)          |capture possible exc state
        tstb            STORE_FLG(%a6)
        bnes            no_store        |if STORE_FLG is set, no store
        bsrl            sto_res         |store the result in user space
no_store:
        bral            gen_except      |post any exceptions and return
 
        |end

Line No.	Rev	Author	Line
1	1623	jcastillo	`\|`
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			`\|`
25			`\| THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF MOTOROLA`
26			`\| The copyright notice above does not evidence any`
27			`\| actual or intended publication of such source code.`
28
29			`X_UNIMP: \|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 do_func`
37			`\|xref sto_res`
38			`\|xref gen_except`
39			`\|xref fpsp_fmt_error`
40
41			`.global fpsp_unimp`
42			`.global uni_2`
43			`fpsp_unimp:`
44			`link %a6,#-LOCAL_SIZE`
45			`fsave -(%a7)`
46			`uni_2:`
47			`moveml %d0-%d1/%a0-%a1,USER_DA(%a6)`
48			`fmovemx %fp0-%fp3,USER_FP0(%a6)`
49			`fmoveml %fpcr/%fpsr/%fpiar,USER_FPCR(%a6)`
50			`moveb (%a7),%d0 \|test for valid version num`
51			`andib #0xf0,%d0 \|test for $4x`
52			`cmpib #VER_4,%d0 \|must be $4x or exit`
53			`bnel fpsp_fmt_error`
54			`\|`
55			`\| Temporary D25B Fix`
56			`\| The following lines are used to ensure that the FPSR`
57			`\| exception byte and condition codes are clear before proceeding`
58			`\|`
59			`movel USER_FPSR(%a6),%d0`
60			`andl #0xFF00FF,%d0 \|clear all but accrued exceptions`
61			`movel %d0,USER_FPSR(%a6)`
62			`fmovel #0,%FPSR \|clear all user bits`
63			`fmovel #0,%FPCR \|clear all user exceptions for FPSP`
64
65			`clrb UFLG_TMP(%a6) \|clr flag for unsupp data`
66
67			`bsrl get_op \|go get operand(s)`
68			`clrb STORE_FLG(%a6)`
69			`bsrl do_func \|do the function`
70			`fsave -(%a7) \|capture possible exc state`
71			`tstb STORE_FLG(%a6)`
72			`bnes no_store \|if STORE_FLG is set, no store`
73			`bsrl sto_res \|store the result in user space`
74			`no_store:`
75			`bral gen_except \|post any exceptions and return`
76
77			`\|end`

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[/] [or1k_old/] [trunk/] [rc203soc/] [sw/] [uClinux/] [arch/] [m68k/] [fpsp040/] [x_unimp.S] - Blame information for rev 1782