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1 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | ||
2 | MOTOROLA MICROPROCESSOR & MEMORY TECHNOLOGY GROUP | ||
3 | M68000 Hi-Performance Microprocessor Division | ||
4 | M68060 Software Package | ||
5 | Production Release P1.00 -- October 10, 1994 | ||
6 | |||
7 | M68060 Software Package Copyright © 1993, 1994 Motorola Inc. All rights reserved. | ||
8 | |||
9 | THE SOFTWARE is provided on an "AS IS" basis and without warranty. | ||
10 | To the maximum extent permitted by applicable law, | ||
11 | MOTOROLA DISCLAIMS ALL WARRANTIES WHETHER EXPRESS OR IMPLIED, | ||
12 | INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE | ||
13 | and any warranty against infringement with regard to the SOFTWARE | ||
14 | (INCLUDING ANY MODIFIED VERSIONS THEREOF) and any accompanying written materials. | ||
15 | |||
16 | To the maximum extent permitted by applicable law, | ||
17 | IN NO EVENT SHALL MOTOROLA BE LIABLE FOR ANY DAMAGES WHATSOEVER | ||
18 | (INCLUDING WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSINESS PROFITS, | ||
19 | BUSINESS INTERRUPTION, LOSS OF BUSINESS INFORMATION, OR OTHER PECUNIARY LOSS) | ||
20 | ARISING OF THE USE OR INABILITY TO USE THE SOFTWARE. | ||
21 | Motorola assumes no responsibility for the maintenance and support of the SOFTWARE. | ||
22 | |||
23 | You are hereby granted a copyright license to use, modify, and distribute the SOFTWARE | ||
24 | so long as this entire notice is retained without alteration in any modified and/or | ||
25 | redistributed versions, and that such modified versions are clearly identified as such. | ||
26 | No licenses are granted by implication, estoppel or otherwise under any patents | ||
27 | or trademarks of Motorola, Inc. | ||
28 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | ||
29 | |||
30 | CHANGES SINCE LAST RELEASE: | ||
31 | --------------------------- | ||
32 | |||
33 | 1) "movep" emulation where data was being read from memory | ||
34 | was reading the intermediate bytes. Emulation now only | ||
35 | reads the required bytes. | ||
36 | |||
37 | 2) "flogn", "flog2", and "flog10" of "1" was setting the | ||
38 | Inexact FPSR bit. Emulation now does not set Inexact for | ||
39 | this case. | ||
40 | |||
41 | 3) For an opclass three FP instruction where the effective addressing | ||
42 | mode was pre-decrement or post-increment and the address register | ||
43 | was A0 or A1, the address register was not being updated as a result | ||
44 | of the operation. This has been corrected. | ||
45 | |||
46 | 4) Beta B.2 version had the following erratum: | ||
47 | |||
48 | Scenario: | ||
49 | --------- | ||
50 | If {i,d}mem_{read,write}_{byte,word,long}() returns | ||
51 | a failing value to the 68060SP, the package ignores | ||
52 | this return value and continues with program execution | ||
53 | as if it never received a failing value. | ||
54 | |||
55 | Effect: | ||
56 | ------- | ||
57 | For example, if a user executed "fsin.x ADDR,fp0" where | ||
58 | ADDR should cause a "segmentation violation", the memory read | ||
59 | requested by the package should return a failing value | ||
60 | to the package. Since the package currently ignores this | ||
61 | return value, the user program will continue to the | ||
62 | next instruction, and the result created in fp0 will be | ||
63 | undefined. | ||
64 | |||
65 | Fix: | ||
66 | ---- | ||
67 | This has been fixed in the current release. | ||
68 | |||
69 | Notes: | ||
70 | ------ | ||
71 | Upon receiving a non-zero (failing) return value from | ||
72 | a {i,d}mem_{read,write}_{byte,word,long}() "call-out", | ||
73 | the package creates a 16-byte access error stack frame | ||
74 | from the current exception stack frame and exits | ||
75 | through the "call-out" _real_access(). This is the process | ||
76 | as described in the MC68060 User's Manual. | ||
77 | |||
78 | For instruction read access errors, the info stacked is: | ||
79 | SR = SR at time of exception | ||
80 | PC = PC of instruction being emulated | ||
81 | VOFF = $4008 (stack frame format type) | ||
82 | ADDRESS = PC of instruction being emulated | ||
83 | FSLW = FAULT STATUS LONGWORD | ||
84 | |||
85 | The valid FSLW bits are: | ||
86 | bit 27 = 1 (misaligned bit) | ||
87 | bit 24 = 1 (read) | ||
88 | bit 23 = 0 (write) | ||
89 | bit 22:21 = 10 (SIZE = word) | ||
90 | bit 20:19 = 00 (TT) | ||
91 | bit 18:16 = x10 (TM; x = 1 for supervisor mode) | ||
92 | bit 15 = 1 (IO) | ||
93 | bit 0 = 1 (Software Emulation Error) | ||
94 | |||
95 | all other bits are EQUAL TO ZERO and can be set by the _real_access() | ||
96 | "call-out" stub by the user as appropriate. The MC68060 User's Manual | ||
97 | stated that ONLY "bit 0" would be set. The 060SP attempts to set a few | ||
98 | other bits. | ||
99 | |||
100 | For data read/write access errors, the info stacked is: | ||
101 | SR = SR at time of exception | ||
102 | PC = PC of instruction being emulated | ||
103 | VOFF = $4008 (stack frame format type) | ||
104 | ADDRESS = Address of source or destination operand | ||
105 | FSLW = FAULT STATUS LONGWORD | ||
106 | |||
107 | The valid FSLW bits are: | ||
108 | bit 27 = 0 (misaligned bit) | ||
109 | bit 24 = x (read; 1 if read, 0 if write) | ||
110 | bit 23 = x (write; 1 if write, 0 if read) | ||
111 | bit 22:21 = xx (SIZE; see MC68060 User's Manual) | ||
112 | bit 20:19 = 00 (TT) | ||
113 | bit 18:16 = x01 (TM; x = 1 for supervisor mode) | ||
114 | bit 15 = 0 (IO) | ||
115 | bit 0 = 1 (Software Emulation Error) | ||
116 | |||
117 | all other bits are EQUAL TO ZERO and can be set by the _real_access() | ||
118 | "call-out" stub by the user as appropriate. The MC68060 User's Manual | ||
119 | stated that ONLY "bit 0" would be set. The 060SP attempts to set a few | ||
120 | other bits. | ||