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1 | \ ========== Copyright Header Begin ========================================== |
2 | \ | |
3 | \ Hypervisor Software File: decomp.fth | |
4 | \ | |
5 | \ Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved. | |
6 | \ | |
7 | \ - Do no alter or remove copyright notices | |
8 | \ | |
9 | \ - Redistribution and use of this software in source and binary forms, with | |
10 | \ or without modification, are permitted provided that the following | |
11 | \ conditions are met: | |
12 | \ | |
13 | \ - Redistribution of source code must retain the above copyright notice, | |
14 | \ this list of conditions and the following disclaimer. | |
15 | \ | |
16 | \ - Redistribution in binary form must reproduce the above copyright notice, | |
17 | \ this list of conditions and the following disclaimer in the | |
18 | \ documentation and/or other materials provided with the distribution. | |
19 | \ | |
20 | \ Neither the name of Sun Microsystems, Inc. or the names of contributors | |
21 | \ may be used to endorse or promote products derived from this software | |
22 | \ without specific prior written permission. | |
23 | \ | |
24 | \ This software is provided "AS IS," without a warranty of any kind. | |
25 | \ ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, | |
26 | \ INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A | |
27 | \ PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN | |
28 | \ MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR | |
29 | \ ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR | |
30 | \ DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN | |
31 | \ OR ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR | |
32 | \ FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE | |
33 | \ DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, | |
34 | \ ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF | |
35 | \ SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. | |
36 | \ | |
37 | \ You acknowledge that this software is not designed, licensed or | |
38 | \ intended for use in the design, construction, operation or maintenance of | |
39 | \ any nuclear facility. | |
40 | \ | |
41 | \ ========== Copyright Header End ============================================ | |
42 | id: @(#)decomp.fth 1.2 01/04/06 | |
43 | purpose: | |
44 | copyright: Copyright 1997-2001 Sun Microsystems, Inc. All Rights Reserved | |
45 | ||
46 | headerless | |
47 | ||
48 | \ In: | |
49 | \ scr = decomp data ptr | |
50 | \ sc1 = src addr | |
51 | \ sc2 = #bytes remaining | |
52 | \ Out: | |
53 | \ tos = byte|-1 | |
54 | \ | |
55 | label decomp-getabyte | |
56 | scr 0 >source-addr sc1 ld \ scr = src addr | |
57 | scr 0 >source-size sc2 ld \ sc1 = #bytes left | |
58 | sc2 1 sc2 subcc | |
59 | 0>= if | |
60 | %g0 -1 tos add \ (delay) | |
61 | sc1 %g0 tos ldub \ get data | |
62 | sc1 1 sc1 add | |
63 | sc1 scr 0 >source-addr st \ update src pointer | |
64 | then | |
65 | retl | |
66 | sc2 scr 0 >source-size st \ update #bytes left (delay) | |
67 | end-code | |
68 | ||
69 | \ | |
70 | \ Forth Version of assembler routine | |
71 | \ | |
72 | code decomp-getbyte ( data-buffer -- byte|-1 ) | |
73 | decomp-getabyte call tos scr move | |
74 | c; | |
75 | ||
76 | code decomp-putbyte ( byte buffer -- ) | |
77 | tos sc1 move | |
78 | sp scr pop | |
79 | sp tos pop | |
80 | sc1 0 >dest-addr sc2 ld \ get dest address | |
81 | scr sc2 %g0 stb \ write data | |
82 | sc2 1 sc2 add | |
83 | sc2 sc1 0 >dest-addr st \ update ptr | |
84 | c; | |
85 | ||
86 | \ In: | |
87 | \ tos | |
88 | \ Scratch: | |
89 | \ scr, sc1, sc2 - by getabyte | |
90 | \ sc3, sc4, sc5 - by getcode | |
91 | \ Out: | |
92 | \ tos | |
93 | \ | |
94 | code decomp-getcode ( bits buffer -- code ) | |
95 | tos scr move \ preserve buffer ptr | |
96 | sp sc3 pop | |
97 | scr 0 >getcode-offset sc4 ld \ get previous offset | |
98 | scr 0 >getcode-oldcode sc5 ld \ get previous code | |
99 | ||
100 | \ Watch the 'if' trick coming up. | |
101 | ||
102 | begin | |
103 | decomp-getabyte call nop | |
104 | tos -1 %g0 subcc | |
105 | <> if but | |
106 | tos sc4 sc1 sll \ (byte << r_off) (delay) | |
107 | sc4 8 sc4 add \ r_off += 8 | |
108 | sc4 sc3 cmp | |
109 | >= until | |
110 | sc5 sc1 sc5 add \ code += (byte << r_off) (delay) | |
111 | ||
112 | sc5 sc3 sc1 srl \ (code >> bits) | |
113 | sc4 sc3 sc2 sub \ r_off - bits | |
114 | sc1 scr 0 >getcode-oldcode st \ getcode_oldcode = (code >> bits) | |
115 | sc2 scr 0 >getcode-offset st \ getcode_offset = (r_off - bits) | |
116 | ||
117 | %g0 1 scr sub | |
118 | scr sc3 scr sllx \ mask = (-1 << bits) | |
119 | sc5 scr tos andn \ tos = tos & ~mask | |
120 | then | |
121 | c; |