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 #include "precompiled.hpp" 26 #include "asm/macroAssembler.hpp" 27 #include "assembler_arm.inline.hpp" 28 #include "memory/resourceArea.hpp" 29 #include "prims/jniFastGetField.hpp" 30 #include "prims/jvm_misc.hpp" 31 #include "runtime/safepoint.hpp" 32 33 #define __ masm-> 34 35 #define BUFFER_SIZE 96 36 37 address JNI_FastGetField::generate_fast_get_int_field0(BasicType type) { 38 const char* name = NULL; 39 address slow_case_addr = NULL; 40 switch (type) { 41 case T_BOOLEAN: 42 name = "jni_fast_GetBooleanField"; 43 slow_case_addr = jni_GetBooleanField_addr(); 44 break; 45 case T_BYTE: 46 name = "jni_fast_GetByteField"; 47 slow_case_addr = jni_GetByteField_addr(); 48 break; 49 case T_CHAR: 50 name = "jni_fast_GetCharField"; 51 slow_case_addr = jni_GetCharField_addr(); 52 break; 53 case T_SHORT: 54 name = "jni_fast_GetShortField"; 55 slow_case_addr = jni_GetShortField_addr(); 56 break; 57 case T_INT: 58 name = "jni_fast_GetIntField"; 59 slow_case_addr = jni_GetIntField_addr(); 60 break; 61 case T_LONG: 62 name = "jni_fast_GetLongField"; 63 slow_case_addr = jni_GetLongField_addr(); 64 break; 65 case T_FLOAT: 66 name = "jni_fast_GetFloatField"; 67 slow_case_addr = jni_GetFloatField_addr(); 68 break; 69 case T_DOUBLE: 70 name = "jni_fast_GetDoubleField"; 71 slow_case_addr = jni_GetDoubleField_addr(); 72 break; 73 default: 74 ShouldNotReachHere(); 75 } 76 77 // R0 - jni env 78 // R1 - object handle 79 // R2 - jfieldID 80 81 const Register Rsafepoint_counter_addr = AARCH64_ONLY(R4) NOT_AARCH64(R3); 82 const Register Robj = AARCH64_ONLY(R5) NOT_AARCH64(R1); 83 const Register Rres = AARCH64_ONLY(R6) NOT_AARCH64(R0); 84 #ifndef AARCH64 85 const Register Rres_hi = R1; 86 #endif // !AARCH64 87 const Register Rsafept_cnt = Rtemp; 88 const Register Rsafept_cnt2 = Rsafepoint_counter_addr; 89 const Register Rtmp1 = AARCH64_ONLY(R7) NOT_AARCH64(R3); // same as Rsafepoint_counter_addr on 32-bit ARM 90 const Register Rtmp2 = AARCH64_ONLY(R8) NOT_AARCH64(R2); // same as jfieldID on 32-bit ARM 91 92 #ifdef AARCH64 93 assert_different_registers(Rsafepoint_counter_addr, Rsafept_cnt, Robj, Rres, Rtmp1, Rtmp2, R0, R1, R2, LR); 94 assert_different_registers(Rsafept_cnt2, Rsafept_cnt, Rres, R0, R1, R2, LR); 95 #else 96 assert_different_registers(Rsafepoint_counter_addr, Rsafept_cnt, Robj, Rres, LR); 97 assert_different_registers(Rsafept_cnt, R1, R2, Rtmp1, LR); 98 assert_different_registers(Rsafepoint_counter_addr, Rsafept_cnt, Rres, Rres_hi, Rtmp2, LR); 99 assert_different_registers(Rsafept_cnt2, Rsafept_cnt, Rres, Rres_hi, LR); 100 #endif // AARCH64 101 102 address fast_entry; 103 104 ResourceMark rm; 105 BufferBlob* blob = BufferBlob::create(name, BUFFER_SIZE); 106 CodeBuffer cbuf(blob); 107 MacroAssembler* masm = new MacroAssembler(&cbuf); 108 fast_entry = __ pc(); 109 110 // Safepoint check 111 InlinedAddress safepoint_counter_addr(SafepointSynchronize::safepoint_counter_addr()); 112 Label slow_case; 113 __ ldr_literal(Rsafepoint_counter_addr, safepoint_counter_addr); 114 115 #ifndef AARCH64 116 __ push(RegisterSet(R0, R3)); // save incoming arguments for slow case 117 #endif // !AARCH64 118 119 __ ldr_s32(Rsafept_cnt, Address(Rsafepoint_counter_addr)); 120 __ tbnz(Rsafept_cnt, 0, slow_case); 121 122 if (os::is_MP()) { 123 // Address dependency restricts memory access ordering. It's cheaper than explicit LoadLoad barrier 124 __ andr(Rtmp1, Rsafept_cnt, (unsigned)1); 125 __ ldr(Robj, Address(R1, Rtmp1)); 126 } else { 127 __ ldr(Robj, Address(R1)); 128 } 129 130 #ifdef AARCH64 131 __ add(Robj, Robj, AsmOperand(R2, lsr, 2)); 132 Address field_addr = Address(Robj); 133 #else 134 Address field_addr; 135 if (type != T_BOOLEAN 136 && type != T_INT 137 #ifndef __ABI_HARD__ 138 && type != T_FLOAT 139 #endif // !__ABI_HARD__ 140 ) { 141 // Only ldr and ldrb support embedded shift, other loads do not 142 __ add(Robj, Robj, AsmOperand(R2, lsr, 2)); 143 field_addr = Address(Robj); 144 } else { 145 field_addr = Address(Robj, R2, lsr, 2); 146 } 147 #endif // AARCH64 148 assert(count < LIST_CAPACITY, "LIST_CAPACITY too small"); 149 speculative_load_pclist[count] = __ pc(); 150 151 switch (type) { 152 case T_BOOLEAN: 153 __ ldrb(Rres, field_addr); 154 break; 155 case T_BYTE: 156 __ ldrsb(Rres, field_addr); 157 break; 158 case T_CHAR: 159 __ ldrh(Rres, field_addr); 160 break; 161 case T_SHORT: 162 __ ldrsh(Rres, field_addr); 163 break; 164 case T_INT: 165 #ifndef __ABI_HARD__ 166 case T_FLOAT: 167 #endif 168 __ ldr_s32(Rres, field_addr); 169 break; 170 case T_LONG: 171 #ifndef __ABI_HARD__ 172 case T_DOUBLE: 173 #endif 174 #ifdef AARCH64 175 __ ldr(Rres, field_addr); 176 #else 177 // Safe to use ldrd since long and double fields are 8-byte aligned 178 __ ldrd(Rres, field_addr); 179 #endif // AARCH64 180 break; 181 #ifdef __ABI_HARD__ 182 case T_FLOAT: 183 __ ldr_float(S0, field_addr); 184 break; 185 case T_DOUBLE: 186 __ ldr_double(D0, field_addr); 187 break; 188 #endif // __ABI_HARD__ 189 default: 190 ShouldNotReachHere(); 191 } 192 193 if(os::is_MP()) { 194 // Address dependency restricts memory access ordering. It's cheaper than explicit LoadLoad barrier 195 #if defined(__ABI_HARD__) && !defined(AARCH64) 196 if (type == T_FLOAT || type == T_DOUBLE) { 197 __ ldr_literal(Rsafepoint_counter_addr, safepoint_counter_addr); 198 __ fmrrd(Rres, Rres_hi, D0); 199 __ eor(Rtmp2, Rres, Rres); 200 __ ldr_s32(Rsafept_cnt2, Address(Rsafepoint_counter_addr, Rtmp2)); 201 } else 202 #endif // __ABI_HARD__ && !AARCH64 203 { 204 #ifndef AARCH64 205 __ ldr_literal(Rsafepoint_counter_addr, safepoint_counter_addr); 206 #endif // !AARCH64 207 __ eor(Rtmp2, Rres, Rres); 208 __ ldr_s32(Rsafept_cnt2, Address(Rsafepoint_counter_addr, Rtmp2)); 209 } 210 } else { 211 __ ldr_s32(Rsafept_cnt2, Address(Rsafepoint_counter_addr)); 212 } 213 __ cmp(Rsafept_cnt2, Rsafept_cnt); 214 #ifdef AARCH64 215 __ b(slow_case, ne); 216 __ mov(R0, Rres); 217 __ ret(); 218 #else 219 // discards saved R0 R1 R2 R3 220 __ add(SP, SP, 4 * wordSize, eq); 221 __ bx(LR, eq); 222 #endif // AARCH64 223 224 slowcase_entry_pclist[count++] = __ pc(); 225 226 __ bind(slow_case); 227 #ifndef AARCH64 228 __ pop(RegisterSet(R0, R3)); 229 #endif // !AARCH64 230 // thumb mode switch handled by MacroAssembler::jump if needed 231 __ jump(slow_case_addr, relocInfo::none, Rtemp); 232 233 __ bind_literal(safepoint_counter_addr); 234 235 __ flush(); 236 237 guarantee((__ pc() - fast_entry) <= BUFFER_SIZE, "BUFFER_SIZE too small"); 238 239 return fast_entry; 240 } 241 242 address JNI_FastGetField::generate_fast_get_float_field0(BasicType type) { 243 ShouldNotReachHere(); 244 return NULL; 245 } 246 247 address JNI_FastGetField::generate_fast_get_boolean_field() { 248 return generate_fast_get_int_field0(T_BOOLEAN); 249 } 250 251 address JNI_FastGetField::generate_fast_get_byte_field() { 252 return generate_fast_get_int_field0(T_BYTE); 253 } 254 255 address JNI_FastGetField::generate_fast_get_char_field() { 256 return generate_fast_get_int_field0(T_CHAR); 257 } 258 259 address JNI_FastGetField::generate_fast_get_short_field() { 260 return generate_fast_get_int_field0(T_SHORT); 261 } 262 263 address JNI_FastGetField::generate_fast_get_int_field() { 264 return generate_fast_get_int_field0(T_INT); 265 } 266 267 address JNI_FastGetField::generate_fast_get_long_field() { 268 return generate_fast_get_int_field0(T_LONG); 269 } 270 271 address JNI_FastGetField::generate_fast_get_float_field() { 272 return generate_fast_get_int_field0(T_FLOAT); 273 } 274 275 address JNI_FastGetField::generate_fast_get_double_field() { 276 return generate_fast_get_int_field0(T_DOUBLE); 277 }