bytes_ppc.hpp revision 11658:8a5735c11a84
1238104Sdes/* 2238104Sdes * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved. 3238104Sdes * Copyright (c) 2012, 2016 SAP SE. All rights reserved. 4238104Sdes * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5238104Sdes * 6238104Sdes * This code is free software; you can redistribute it and/or modify it 7238104Sdes * under the terms of the GNU General Public License version 2 only, as 8238104Sdes * published by the Free Software Foundation. 9238104Sdes * 10238104Sdes * This code is distributed in the hope that it will be useful, but WITHOUT 11238104Sdes * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12238104Sdes * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13238104Sdes * version 2 for more details (a copy is included in the LICENSE file that 14238104Sdes * accompanied this code). 15238104Sdes * 16238104Sdes * You should have received a copy of the GNU General Public License version 17238104Sdes * 2 along with this work; if not, write to the Free Software Foundation, 18238104Sdes * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19238104Sdes * 20238104Sdes * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21238104Sdes * or visit www.oracle.com if you need additional information or have any 22238104Sdes * questions. 23238104Sdes * 24238104Sdes */ 25238104Sdes 26238104Sdes#ifndef CPU_PPC_VM_BYTES_PPC_HPP 27238104Sdes#define CPU_PPC_VM_BYTES_PPC_HPP 28238104Sdes 29238104Sdes#include "memory/allocation.hpp" 30238104Sdes 31238104Sdesclass Bytes: AllStatic { 32238104Sdes public: 33238104Sdes // Efficient reading and writing of unaligned unsigned data in platform-specific byte ordering 34238104Sdes // PowerPC needs to check for alignment. 35238104Sdes 36238104Sdes // Can I count on address always being a pointer to an unsigned char? Yes. 37238104Sdes 38238104Sdes#if defined(VM_LITTLE_ENDIAN) 39238104Sdes 40238104Sdes // Returns true, if the byte ordering used by Java is different from the native byte ordering 41238104Sdes // of the underlying machine. For example, true for Intel x86, False, for Solaris on Sparc. 42238104Sdes static inline bool is_Java_byte_ordering_different() { return true; } 43238104Sdes 44238104Sdes // Forward declarations of the compiler-dependent implementation 45238104Sdes static inline u2 swap_u2(u2 x); 46238104Sdes static inline u4 swap_u4(u4 x); 47238104Sdes static inline u8 swap_u8(u8 x); 48238104Sdes 49238104Sdes static inline u2 get_native_u2(address p) { 50238104Sdes return (intptr_t(p) & 1) == 0 51238104Sdes ? *(u2*)p 52238104Sdes : ( u2(p[1]) << 8 ) 53238104Sdes | ( u2(p[0]) ); 54238104Sdes } 55238104Sdes 56238104Sdes static inline u4 get_native_u4(address p) { 57238104Sdes switch (intptr_t(p) & 3) { 58238104Sdes case 0: return *(u4*)p; 59238104Sdes 60238104Sdes case 2: return ( u4( ((u2*)p)[1] ) << 16 ) 61238104Sdes | ( u4( ((u2*)p)[0] ) ); 62238104Sdes 63238104Sdes default: return ( u4(p[3]) << 24 ) 64238104Sdes | ( u4(p[2]) << 16 ) 65238104Sdes | ( u4(p[1]) << 8 ) 66238104Sdes | u4(p[0]); 67238104Sdes } 68238104Sdes } 69238104Sdes 70238104Sdes static inline u8 get_native_u8(address p) { 71238104Sdes switch (intptr_t(p) & 7) { 72238104Sdes case 0: return *(u8*)p; 73238104Sdes 74238104Sdes case 4: return ( u8( ((u4*)p)[1] ) << 32 ) 75238104Sdes | ( u8( ((u4*)p)[0] ) ); 76238104Sdes 77238104Sdes case 2: return ( u8( ((u2*)p)[3] ) << 48 ) 78238104Sdes | ( u8( ((u2*)p)[2] ) << 32 ) 79238104Sdes | ( u8( ((u2*)p)[1] ) << 16 ) 80238104Sdes | ( u8( ((u2*)p)[0] ) ); 81238104Sdes 82238104Sdes default: return ( u8(p[7]) << 56 ) 83238104Sdes | ( u8(p[6]) << 48 ) 84238104Sdes | ( u8(p[5]) << 40 ) 85238104Sdes | ( u8(p[4]) << 32 ) 86238104Sdes | ( u8(p[3]) << 24 ) 87238104Sdes | ( u8(p[2]) << 16 ) 88238104Sdes | ( u8(p[1]) << 8 ) 89238104Sdes | u8(p[0]); 90238104Sdes } 91238104Sdes } 92238104Sdes 93238104Sdes 94238104Sdes 95238104Sdes static inline void put_native_u2(address p, u2 x) { 96238104Sdes if ( (intptr_t(p) & 1) == 0 ) *(u2*)p = x; 97238104Sdes else { 98238104Sdes p[1] = x >> 8; 99238104Sdes p[0] = x; 100238104Sdes } 101238104Sdes } 102238104Sdes 103238104Sdes static inline void put_native_u4(address p, u4 x) { 104238104Sdes switch ( intptr_t(p) & 3 ) { 105238104Sdes case 0: *(u4*)p = x; 106238104Sdes break; 107238104Sdes 108238104Sdes case 2: ((u2*)p)[1] = x >> 16; 109238104Sdes ((u2*)p)[0] = x; 110238104Sdes break; 111238104Sdes 112238104Sdes default: ((u1*)p)[3] = x >> 24; 113238104Sdes ((u1*)p)[2] = x >> 16; 114238104Sdes ((u1*)p)[1] = x >> 8; 115238104Sdes ((u1*)p)[0] = x; 116 break; 117 } 118 } 119 120 static inline void put_native_u8(address p, u8 x) { 121 switch ( intptr_t(p) & 7 ) { 122 case 0: *(u8*)p = x; 123 break; 124 125 case 4: ((u4*)p)[1] = x >> 32; 126 ((u4*)p)[0] = x; 127 break; 128 129 case 2: ((u2*)p)[3] = x >> 48; 130 ((u2*)p)[2] = x >> 32; 131 ((u2*)p)[1] = x >> 16; 132 ((u2*)p)[0] = x; 133 break; 134 135 default: ((u1*)p)[7] = x >> 56; 136 ((u1*)p)[6] = x >> 48; 137 ((u1*)p)[5] = x >> 40; 138 ((u1*)p)[4] = x >> 32; 139 ((u1*)p)[3] = x >> 24; 140 ((u1*)p)[2] = x >> 16; 141 ((u1*)p)[1] = x >> 8; 142 ((u1*)p)[0] = x; 143 } 144 } 145 146 // Efficient reading and writing of unaligned unsigned data in Java byte ordering (i.e. big-endian ordering) 147 // (no byte-order reversal is needed since Power CPUs are big-endian oriented). 148 static inline u2 get_Java_u2(address p) { return swap_u2(get_native_u2(p)); } 149 static inline u4 get_Java_u4(address p) { return swap_u4(get_native_u4(p)); } 150 static inline u8 get_Java_u8(address p) { return swap_u8(get_native_u8(p)); } 151 152 static inline void put_Java_u2(address p, u2 x) { put_native_u2(p, swap_u2(x)); } 153 static inline void put_Java_u4(address p, u4 x) { put_native_u4(p, swap_u4(x)); } 154 static inline void put_Java_u8(address p, u8 x) { put_native_u8(p, swap_u8(x)); } 155 156#else // !defined(VM_LITTLE_ENDIAN) 157 158 // Returns true, if the byte ordering used by Java is different from the nativ byte ordering 159 // of the underlying machine. For example, true for Intel x86, False, for Solaris on Sparc. 160 static inline bool is_Java_byte_ordering_different() { return false; } 161 162 // Thus, a swap between native and Java ordering is always a no-op: 163 static inline u2 swap_u2(u2 x) { return x; } 164 static inline u4 swap_u4(u4 x) { return x; } 165 static inline u8 swap_u8(u8 x) { return x; } 166 167 static inline u2 get_native_u2(address p) { 168 return (intptr_t(p) & 1) == 0 169 ? *(u2*)p 170 : ( u2(p[0]) << 8 ) 171 | ( u2(p[1]) ); 172 } 173 174 static inline u4 get_native_u4(address p) { 175 switch (intptr_t(p) & 3) { 176 case 0: return *(u4*)p; 177 178 case 2: return ( u4( ((u2*)p)[0] ) << 16 ) 179 | ( u4( ((u2*)p)[1] ) ); 180 181 default: return ( u4(p[0]) << 24 ) 182 | ( u4(p[1]) << 16 ) 183 | ( u4(p[2]) << 8 ) 184 | u4(p[3]); 185 } 186 } 187 188 static inline u8 get_native_u8(address p) { 189 switch (intptr_t(p) & 7) { 190 case 0: return *(u8*)p; 191 192 case 4: return ( u8( ((u4*)p)[0] ) << 32 ) 193 | ( u8( ((u4*)p)[1] ) ); 194 195 case 2: return ( u8( ((u2*)p)[0] ) << 48 ) 196 | ( u8( ((u2*)p)[1] ) << 32 ) 197 | ( u8( ((u2*)p)[2] ) << 16 ) 198 | ( u8( ((u2*)p)[3] ) ); 199 200 default: return ( u8(p[0]) << 56 ) 201 | ( u8(p[1]) << 48 ) 202 | ( u8(p[2]) << 40 ) 203 | ( u8(p[3]) << 32 ) 204 | ( u8(p[4]) << 24 ) 205 | ( u8(p[5]) << 16 ) 206 | ( u8(p[6]) << 8 ) 207 | u8(p[7]); 208 } 209 } 210 211 212 213 static inline void put_native_u2(address p, u2 x) { 214 if ( (intptr_t(p) & 1) == 0 ) { *(u2*)p = x; } 215 else { 216 p[0] = x >> 8; 217 p[1] = x; 218 } 219 } 220 221 static inline void put_native_u4(address p, u4 x) { 222 switch ( intptr_t(p) & 3 ) { 223 case 0: *(u4*)p = x; 224 break; 225 226 case 2: ((u2*)p)[0] = x >> 16; 227 ((u2*)p)[1] = x; 228 break; 229 230 default: ((u1*)p)[0] = x >> 24; 231 ((u1*)p)[1] = x >> 16; 232 ((u1*)p)[2] = x >> 8; 233 ((u1*)p)[3] = x; 234 break; 235 } 236 } 237 238 static inline void put_native_u8(address p, u8 x) { 239 switch ( intptr_t(p) & 7 ) { 240 case 0: *(u8*)p = x; 241 break; 242 243 case 4: ((u4*)p)[0] = x >> 32; 244 ((u4*)p)[1] = x; 245 break; 246 247 case 2: ((u2*)p)[0] = x >> 48; 248 ((u2*)p)[1] = x >> 32; 249 ((u2*)p)[2] = x >> 16; 250 ((u2*)p)[3] = x; 251 break; 252 253 default: ((u1*)p)[0] = x >> 56; 254 ((u1*)p)[1] = x >> 48; 255 ((u1*)p)[2] = x >> 40; 256 ((u1*)p)[3] = x >> 32; 257 ((u1*)p)[4] = x >> 24; 258 ((u1*)p)[5] = x >> 16; 259 ((u1*)p)[6] = x >> 8; 260 ((u1*)p)[7] = x; 261 } 262 } 263 264 // Efficient reading and writing of unaligned unsigned data in Java byte ordering (i.e. big-endian ordering) 265 // (no byte-order reversal is needed since Power CPUs are big-endian oriented). 266 static inline u2 get_Java_u2(address p) { return get_native_u2(p); } 267 static inline u4 get_Java_u4(address p) { return get_native_u4(p); } 268 static inline u8 get_Java_u8(address p) { return get_native_u8(p); } 269 270 static inline void put_Java_u2(address p, u2 x) { put_native_u2(p, x); } 271 static inline void put_Java_u4(address p, u4 x) { put_native_u4(p, x); } 272 static inline void put_Java_u8(address p, u8 x) { put_native_u8(p, x); } 273 274#endif // VM_LITTLE_ENDIAN 275}; 276 277#include OS_CPU_HEADER_INLINE(bytes) 278 279#endif // CPU_PPC_VM_BYTES_PPC_HPP 280