1 /* 2 * Copyright (c) 2008, 2016, 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_ARM_VM_BYTES_ARM_HPP 26 #define CPU_ARM_VM_BYTES_ARM_HPP 27 28 #include "memory/allocation.hpp" 29 #include "utilities/macros.hpp" 30 31 #ifndef VM_LITTLE_ENDIAN 32 #define VM_LITTLE_ENDIAN 1 33 #endif 34 35 class Bytes: AllStatic { 36 37 public: 38 // Returns true if the byte ordering used by Java is different from the native byte ordering 39 // of the underlying machine. 40 static inline bool is_Java_byte_ordering_different() { 41 return VM_LITTLE_ENDIAN != 0; 42 } 43 44 static inline u2 get_Java_u2(address p) { 45 return (u2(p[0]) << 8) | u2(p[1]); 46 } 47 48 static inline u4 get_Java_u4(address p) { 49 return u4(p[0]) << 24 | 50 u4(p[1]) << 16 | 51 u4(p[2]) << 8 | 52 u4(p[3]); 53 } 54 55 static inline u8 get_Java_u8(address p) { 56 return u8(p[0]) << 56 | 57 u8(p[1]) << 48 | 58 u8(p[2]) << 40 | 59 u8(p[3]) << 32 | 60 u8(p[4]) << 24 | 61 u8(p[5]) << 16 | 62 u8(p[6]) << 8 | 63 u8(p[7]); 64 } 65 66 static inline void put_Java_u2(address p, u2 x) { 67 p[0] = x >> 8; 68 p[1] = x; 69 } 70 71 static inline void put_Java_u4(address p, u4 x) { 72 ((u1*)p)[0] = x >> 24; 73 ((u1*)p)[1] = x >> 16; 74 ((u1*)p)[2] = x >> 8; 75 ((u1*)p)[3] = x; 76 } 77 78 static inline void put_Java_u8(address p, u8 x) { 79 ((u1*)p)[0] = x >> 56; 80 ((u1*)p)[1] = x >> 48; 81 ((u1*)p)[2] = x >> 40; 82 ((u1*)p)[3] = x >> 32; 83 ((u1*)p)[4] = x >> 24; 84 ((u1*)p)[5] = x >> 16; 85 ((u1*)p)[6] = x >> 8; 86 ((u1*)p)[7] = x; 87 } 88 89 #ifdef VM_LITTLE_ENDIAN 90 91 static inline u2 get_native_u2(address p) { 92 return (intptr_t(p) & 1) == 0 ? *(u2*)p : u2(p[0]) | (u2(p[1]) << 8); 93 } 94 95 static inline u4 get_native_u4(address p) { 96 switch (intptr_t(p) & 3) { 97 case 0: return *(u4*)p; 98 case 2: return u4(((u2*)p)[0]) | 99 u4(((u2*)p)[1]) << 16; 100 default: return u4(p[0]) | 101 u4(p[1]) << 8 | 102 u4(p[2]) << 16 | 103 u4(p[3]) << 24; 104 } 105 } 106 107 static inline u8 get_native_u8(address p) { 108 switch (intptr_t(p) & 7) { 109 case 0: return *(u8*)p; 110 case 4: return u8(((u4*)p)[0]) | 111 u8(((u4*)p)[1]) << 32; 112 case 2: return u8(((u2*)p)[0]) | 113 u8(((u2*)p)[1]) << 16 | 114 u8(((u2*)p)[2]) << 32 | 115 u8(((u2*)p)[3]) << 48; 116 default: return u8(p[0]) | 117 u8(p[1]) << 8 | 118 u8(p[2]) << 16 | 119 u8(p[3]) << 24 | 120 u8(p[4]) << 32 | 121 u8(p[5]) << 40 | 122 u8(p[6]) << 48 | 123 u8(p[7]) << 56; 124 } 125 } 126 127 static inline void put_native_u2(address p, u2 x) { 128 if ((intptr_t(p) & 1) == 0) { 129 *(u2*)p = x; 130 } else { 131 p[0] = x; 132 p[1] = x >> 8; 133 } 134 } 135 136 static inline void put_native_u4(address p, u4 x) { 137 switch (intptr_t(p) & 3) { 138 case 0: *(u4*)p = x; 139 break; 140 case 2: ((u2*)p)[0] = x; 141 ((u2*)p)[1] = x >> 16; 142 break; 143 default: ((u1*)p)[0] = x; 144 ((u1*)p)[1] = x >> 8; 145 ((u1*)p)[2] = x >> 16; 146 ((u1*)p)[3] = x >> 24; 147 break; 148 } 149 } 150 151 static inline void put_native_u8(address p, u8 x) { 152 switch (intptr_t(p) & 7) { 153 case 0: *(u8*)p = x; 154 break; 155 case 4: ((u4*)p)[0] = x; 156 ((u4*)p)[1] = x >> 32; 157 break; 158 case 2: ((u2*)p)[0] = x; 159 ((u2*)p)[1] = x >> 16; 160 ((u2*)p)[2] = x >> 32; 161 ((u2*)p)[3] = x >> 48; 162 break; 163 default: ((u1*)p)[0] = x; 164 ((u1*)p)[1] = x >> 8; 165 ((u1*)p)[2] = x >> 16; 166 ((u1*)p)[3] = x >> 24; 167 ((u1*)p)[4] = x >> 32; 168 ((u1*)p)[5] = x >> 40; 169 ((u1*)p)[6] = x >> 48; 170 ((u1*)p)[7] = x >> 56; 171 } 172 } 173 174 #else 175 176 static inline u2 get_native_u2(address p) { return get_Java_u2(p); } 177 static inline u4 get_native_u4(address p) { return get_Java_u4(p); } 178 static inline u8 get_native_u8(address p) { return get_Java_u8(p); } 179 static inline void put_native_u2(address p, u2 x) { put_Java_u2(p, x); } 180 static inline void put_native_u4(address p, u4 x) { put_Java_u4(p, x); } 181 static inline void put_native_u8(address p, u8 x) { put_Java_u8(p, x); } 182 183 #endif // VM_LITTLE_ENDIAN 184 185 // Efficient swapping of byte ordering 186 static inline u2 swap_u2(u2 x); 187 static inline u4 swap_u4(u4 x); 188 static inline u8 swap_u8(u8 x); 189 }; 190 191 192 // The following header contains the implementations of swap_u2, swap_u4, and swap_u8 193 #include OS_CPU_HEADER_INLINE(bytes) 194 195 #endif // CPU_ARM_VM_BYTES_ARM_HPP