1 /*
2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef CPU_SPARC_VM_BYTES_SPARC_HPP
26 #define CPU_SPARC_VM_BYTES_SPARC_HPP
27
28 #include "memory/allocation.hpp"
29
30 class Bytes: AllStatic {
31 public:
32 // Efficient reading and writing of unaligned unsigned data in platform-specific byte ordering
33 // Sparc needs to check for alignment.
34
35 // can I count on address always being a pointer to an unsigned char? Yes
36
37 // Returns true, if the byte ordering used by Java is different from the nativ byte ordering
38 // of the underlying machine. For example, true for Intel x86, False, for Solaris on Sparc.
39 static inline bool is_Java_byte_ordering_different() { return false; }
40
41 // Thus, a swap between native and Java ordering is always a no-op:
42 static inline u2 swap_u2(u2 x) { return x; }
43 static inline u4 swap_u4(u4 x) { return x; }
44 static inline u8 swap_u8(u8 x) { return x; }
45
46 static inline u2 get_native_u2(address p){
47 return (intptr_t(p) & 1) == 0
48 ? *(u2*)p
49 : ( u2(p[0]) << 8 )
50 | ( u2(p[1]) );
51 }
52
53 static inline u4 get_native_u4(address p) {
54 switch (intptr_t(p) & 3) {
55 case 0: return *(u4*)p;
56
57 case 2: return ( u4( ((u2*)p)[0] ) << 16 )
58 | ( u4( ((u2*)p)[1] ) );
59
60 default: return ( u4(p[0]) << 24 )
61 | ( u4(p[1]) << 16 )
62 | ( u4(p[2]) << 8 )
63 | u4(p[3]);
64 }
65 }
66
67 static inline u8 get_native_u8(address p) {
68 switch (intptr_t(p) & 7) {
69 case 0: return *(u8*)p;
70
71 case 4: return ( u8( ((u4*)p)[0] ) << 32 )
72 | ( u8( ((u4*)p)[1] ) );
73
74 case 2: return ( u8( ((u2*)p)[0] ) << 48 )
75 | ( u8( ((u2*)p)[1] ) << 32 )
76 | ( u8( ((u2*)p)[2] ) << 16 )
77 | ( u8( ((u2*)p)[3] ) );
78
79 default: return ( u8(p[0]) << 56 )
80 | ( u8(p[1]) << 48 )
81 | ( u8(p[2]) << 40 )
82 | ( u8(p[3]) << 32 )
83 | ( u8(p[4]) << 24 )
84 | ( u8(p[5]) << 16 )
85 | ( u8(p[6]) << 8 )
86 | u8(p[7]);
87 }
88 }
89
90
91
92 static inline void put_native_u2(address p, u2 x) {
93 if ( (intptr_t(p) & 1) == 0 ) *(u2*)p = x;
94 else {
95 p[0] = x >> 8;
96 p[1] = x;
97 }
98 }
99
100 static inline void put_native_u4(address p, u4 x) {
101 switch ( intptr_t(p) & 3 ) {
102 case 0: *(u4*)p = x;
103 break;
104
105 case 2: ((u2*)p)[0] = x >> 16;
106 ((u2*)p)[1] = x;
107 break;
108
109 default: ((u1*)p)[0] = x >> 24;
110 ((u1*)p)[1] = x >> 16;
111 ((u1*)p)[2] = x >> 8;
112 ((u1*)p)[3] = x;
113 break;
114 }
115 }
116
117 static inline void put_native_u8(address p, u8 x) {
118 switch ( intptr_t(p) & 7 ) {
119 case 0: *(u8*)p = x;
120 break;
121
122 case 4: ((u4*)p)[0] = x >> 32;
123 ((u4*)p)[1] = x;
124 break;
125
126 case 2: ((u2*)p)[0] = x >> 48;
127 ((u2*)p)[1] = x >> 32;
128 ((u2*)p)[2] = x >> 16;
129 ((u2*)p)[3] = x;
130 break;
131
132 default: ((u1*)p)[0] = x >> 56;
133 ((u1*)p)[1] = x >> 48;
134 ((u1*)p)[2] = x >> 40;
135 ((u1*)p)[3] = x >> 32;
136 ((u1*)p)[4] = x >> 24;
137 ((u1*)p)[5] = x >> 16;
138 ((u1*)p)[6] = x >> 8;
139 ((u1*)p)[7] = x;
140 }
141 }
142
143
144 // Efficient reading and writing of unaligned unsigned data in Java byte ordering (i.e. big-endian ordering)
145 // (no byte-order reversal is needed since SPARC CPUs are big-endian oriented)
146 static inline u2 get_Java_u2(address p) { return get_native_u2(p); }
147 static inline u4 get_Java_u4(address p) { return get_native_u4(p); }
148 static inline u8 get_Java_u8(address p) { return get_native_u8(p); }
149
150 static inline void put_Java_u2(address p, u2 x) { put_native_u2(p, x); }
151 static inline void put_Java_u4(address p, u4 x) { put_native_u4(p, x); }
152 static inline void put_Java_u8(address p, u8 x) { put_native_u8(p, x); }
153 };
154
155 //Reconciliation History
156 // 1.7 98/02/24 10:18:41 bytes_i486.hpp
157 // 1.10 98/04/08 18:47:57 bytes_i486.hpp
158 // 1.13 98/07/15 17:10:03 bytes_i486.hpp
159 // 1.14 98/08/13 10:38:23 bytes_i486.hpp
160 // 1.15 98/10/05 16:30:21 bytes_i486.hpp
161 // 1.17 99/06/22 16:37:35 bytes_i486.hpp
162 //End
163
164 #endif // CPU_SPARC_VM_BYTES_SPARC_HPP