Annotation of sys/arch/m68k/fpsp/x_unimp.sa, Revision 1.1.1.1
1.1 nbrk 1: * $OpenBSD: x_unimp.sa,v 1.2 1996/05/29 21:05:50 niklas Exp $
2: * $NetBSD: x_unimp.sa,v 1.2 1994/10/26 07:50:32 cgd Exp $
3:
4: * MOTOROLA MICROPROCESSOR & MEMORY TECHNOLOGY GROUP
5: * M68000 Hi-Performance Microprocessor Division
6: * M68040 Software Package
7: *
8: * M68040 Software Package Copyright (c) 1993, 1994 Motorola Inc.
9: * All rights reserved.
10: *
11: * THE SOFTWARE is provided on an "AS IS" basis and without warranty.
12: * To the maximum extent permitted by applicable law,
13: * MOTOROLA DISCLAIMS ALL WARRANTIES WHETHER EXPRESS OR IMPLIED,
14: * INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A
15: * PARTICULAR PURPOSE and any warranty against infringement with
16: * regard to the SOFTWARE (INCLUDING ANY MODIFIED VERSIONS THEREOF)
17: * and any accompanying written materials.
18: *
19: * To the maximum extent permitted by applicable law,
20: * IN NO EVENT SHALL MOTOROLA BE LIABLE FOR ANY DAMAGES WHATSOEVER
21: * (INCLUDING WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSINESS
22: * PROFITS, BUSINESS INTERRUPTION, LOSS OF BUSINESS INFORMATION, OR
23: * OTHER PECUNIARY LOSS) ARISING OF THE USE OR INABILITY TO USE THE
24: * SOFTWARE. Motorola assumes no responsibility for the maintenance
25: * and support of the SOFTWARE.
26: *
27: * You are hereby granted a copyright license to use, modify, and
28: * distribute the SOFTWARE so long as this entire notice is retained
29: * without alteration in any modified and/or redistributed versions,
30: * and that such modified versions are clearly identified as such.
31: * No licenses are granted by implication, estoppel or otherwise
32: * under any patents or trademarks of Motorola, Inc.
33:
34: *
35: * x_unimp.sa 3.3 7/1/91
36: *
37: * fpsp_unimp --- FPSP handler for unimplemented instruction
38: * exception.
39: *
40: * Invoked when the user program encounters a floating-point
41: * op-code that hardware does not support. Trap vector# 11
42: * (See table 8-1 MC68030 User's Manual).
43: *
44: *
45: * Note: An fsave for an unimplemented inst. will create a short
46: * fsave stack.
47: *
48: * Input: 1. Six word stack frame for unimplemented inst, four word
49: * for illegal
50: * (See table 8-7 MC68030 User's Manual).
51: * 2. Unimp (short) fsave state frame created here by fsave
52: * instruction.
53: *
54:
55: X_UNIMP IDNT 2,1 Motorola 040 Floating Point Software Package
56:
57: section 8
58:
59: include fpsp.h
60:
61: xref get_op
62: xref do_func
63: xref sto_res
64: xref gen_except
65: xref fpsp_fmt_error
66:
67: xdef fpsp_unimp
68: xdef uni_2
69: fpsp_unimp:
70: link a6,#-LOCAL_SIZE
71: fsave -(a7)
72: uni_2:
73: movem.l d0-d1/a0-a1,USER_DA(a6)
74: fmovem.x fp0-fp3,USER_FP0(a6)
75: fmovem.l fpcr/fpsr/fpiar,USER_FPCR(a6)
76: move.b (a7),d0 ;test for valid version num
77: andi.b #$f0,d0 ;test for $4x
78: cmpi.b #VER_4,d0 ;must be $4x or exit
79: bne.l fpsp_fmt_error
80: *
81: * Temporary D25B Fix
82: * The following lines are used to ensure that the FPSR
83: * exception byte and condition codes are clear before proceeding
84: *
85: move.l USER_FPSR(a6),d0
86: and.l #$FF00FF,d0 ;clear all but accrued exceptions
87: move.l d0,USER_FPSR(a6)
88: fmove.l #0,FPSR ;clear all user bits
89: fmove.l #0,FPCR ;clear all user exceptions for FPSP
90:
91: clr.b UFLG_TMP(a6) ;clr flag for unsupp data
92:
93: bsr.l get_op ;go get operand(s)
94: clr.b STORE_FLG(a6)
95: bsr.l do_func ;do the function
96: fsave -(a7) ;capture possible exc state
97: tst.b STORE_FLG(a6)
98: bne.b no_store ;if STORE_FLG is set, no store
99: bsr.l sto_res ;store the result in user space
100: no_store:
101: bra.l gen_except ;post any exceptions and return
102:
103: end
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