1 /* 2 * Copyright (c) 2008, 2018, 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 #ifdef AARCH64 123 // If mask changes we need to ensure that the inverse is still encodable as an immediate 124 STATIC_ASSERT(JNIHandles::weak_tag_mask == 1); 125 __ andr(R1, R1, ~JNIHandles::weak_tag_mask); 126 #else 127 __ bic(R1, R1, JNIHandles::weak_tag_mask); 128 #endif 129 130 // Address dependency restricts memory access ordering. It's cheaper than explicit LoadLoad barrier 131 __ andr(Rtmp1, Rsafept_cnt, (unsigned)1); 132 __ ldr(Robj, Address(R1, Rtmp1)); 133 134 #ifdef AARCH64 135 __ add(Robj, Robj, AsmOperand(R2, lsr, 2)); 136 Address field_addr = Address(Robj); 137 #else 138 Address field_addr; 139 if (type != T_BOOLEAN 140 && type != T_INT 141 #ifndef __ABI_HARD__ 142 && type != T_FLOAT 143 #endif // !__ABI_HARD__ 144 ) { 145 // Only ldr and ldrb support embedded shift, other loads do not 146 __ add(Robj, Robj, AsmOperand(R2, lsr, 2)); 147 field_addr = Address(Robj); 148 } else { 149 field_addr = Address(Robj, R2, lsr, 2); 150 } 151 #endif // AARCH64 152 assert(count < LIST_CAPACITY, "LIST_CAPACITY too small"); 153 speculative_load_pclist[count] = __ pc(); 154 155 switch (type) { 156 case T_BOOLEAN: 157 __ ldrb(Rres, field_addr); 158 break; 159 case T_BYTE: 160 __ ldrsb(Rres, field_addr); 161 break; 162 case T_CHAR: 163 __ ldrh(Rres, field_addr); 164 break; 165 case T_SHORT: 166 __ ldrsh(Rres, field_addr); 167 break; 168 case T_INT: 169 #ifndef __ABI_HARD__ 170 case T_FLOAT: 171 #endif 172 __ ldr_s32(Rres, field_addr); 173 break; 174 case T_LONG: 175 #ifndef __ABI_HARD__ 176 case T_DOUBLE: 177 #endif 178 #ifdef AARCH64 179 __ ldr(Rres, field_addr); 180 #else 181 // Safe to use ldrd since long and double fields are 8-byte aligned 182 __ ldrd(Rres, field_addr); 183 #endif // AARCH64 184 break; 185 #ifdef __ABI_HARD__ 186 case T_FLOAT: 187 __ ldr_float(S0, field_addr); 188 break; 189 case T_DOUBLE: 190 __ ldr_double(D0, field_addr); 191 break; 192 #endif // __ABI_HARD__ 193 default: 194 ShouldNotReachHere(); 195 } 196 197 // Address dependency restricts memory access ordering. It's cheaper than explicit LoadLoad barrier 198 #if defined(__ABI_HARD__) && !defined(AARCH64) 199 if (type == T_FLOAT || type == T_DOUBLE) { 200 __ ldr_literal(Rsafepoint_counter_addr, safepoint_counter_addr); 201 __ fmrrd(Rres, Rres_hi, D0); 202 __ eor(Rtmp2, Rres, Rres); 203 __ ldr_s32(Rsafept_cnt2, Address(Rsafepoint_counter_addr, Rtmp2)); 204 } else 205 #endif // __ABI_HARD__ && !AARCH64 206 { 207 #ifndef AARCH64 208 __ ldr_literal(Rsafepoint_counter_addr, safepoint_counter_addr); 209 #endif // !AARCH64 210 __ eor(Rtmp2, Rres, Rres); 211 __ ldr_s32(Rsafept_cnt2, Address(Rsafepoint_counter_addr, Rtmp2)); 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 }