1 /*
2 * Copyright (c) 2004, 2017, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2014, Red Hat Inc. All rights reserved.
4 * Copyright (c) 2015, Linaro Ltd. All rights reserved.
5 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 *
7 * This code is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License version 2 only, as
9 * published by the Free Software Foundation.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 *
25 */
26
27 #include "precompiled.hpp"
28 #include "asm/macroAssembler.hpp"
29 #include "gc/shared/barrierSet.hpp"
30 #include "gc/shared/barrierSetAssembler.hpp"
31 #include "memory/resourceArea.hpp"
32 #include "prims/jniFastGetField.hpp"
33 #include "prims/jvm_misc.hpp"
34 #include "runtime/safepoint.hpp"
35
36 #define __ masm->
37
38 #define BUFFER_SIZE_ARMV7 31*wordSize
39 #define BUFFER_SIZE_ARMV6 51*wordSize
40
41 // Instead of issuing a LoadLoad barrier we create an address
42 // dependency between loads; this might be more efficient.
43
44 // Common register usage:
45 // r0/v0: result
46 // c_rarg0: jni env
47 // c_rarg1: obj
48 // c_rarg2: jfield id
49
50 address JNI_FastGetField::generate_fast_get_int_field0(BasicType type) {
51 Register result = c_rarg0;
52 Register robj = c_rarg1;
53 Register rcounter = c_rarg3;
54 int args = RegSet::of(c_rarg0, c_rarg1, c_rarg2).bits();
55 int nargs = 3;
56
57 const char *name;
58 switch (type) {
59 case T_BOOLEAN: name = "jni_fast_GetBooleanField"; break;
60 case T_BYTE: name = "jni_fast_GetByteField"; break;
61 case T_CHAR: name = "jni_fast_GetCharField"; break;
62 case T_SHORT: name = "jni_fast_GetShortField"; break;
63 case T_INT: name = "jni_fast_GetIntField"; break;
64 case T_LONG: name = "jni_fast_GetLongField"; break;
65 case T_FLOAT: name = "jni_fast_GetFloatField"; break;
66 case T_DOUBLE: name = "jni_fast_GetDoubleField"; break;
67 default: ShouldNotReachHere(); name = ""; // unreachable
68 }
69 ResourceMark rm;
70 BufferBlob* blob = BufferBlob::create(name,
71 VM_Version::features() & FT_ARMV7 ?
72 BUFFER_SIZE_ARMV7 :
73 BUFFER_SIZE_ARMV6 );
74 CodeBuffer cbuf(blob);
75 MacroAssembler* masm = new MacroAssembler(&cbuf);
76 address fast_entry = __ pc();
77
78 Label slow;
79
80 __ lea(rcounter, SafepointSynchronize::safepoint_counter_addr());
81 __ ldr(rcounter, rcounter);
82 __ tst(rcounter, 1);
83 __ b(slow, Assembler::NE);
84 __ stmdb(sp, args);
85 // doesn't change c_rarg1 but does force a dependency on rcounter before
86 // performing __ ldr(robj, ...
87 __ eor(robj, c_rarg1, rcounter);
88 __ eor(robj, robj, rcounter);
89
90 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
91 bs->try_resolve_jobject_in_native(masm, c_rarg0, robj, noreg, slow);
92
93 assert(count < LIST_CAPACITY, "LIST_CAPACITY too small");
94 speculative_load_pclist[count] = __ pc(); // Used by the segfault handler
95 // c_rarg2 * 2 is offset
96 // Only ldr & ldrb support shifted loads
97 switch (type) {
98 case T_FLOAT:
99 case T_INT: __ ldr (result, Address(robj, c_rarg2, lsr(2))); break;
100 case T_BOOLEAN: __ ldrb(result, Address(robj, c_rarg2, lsr(2))); break;
101 default: {
102 __ lsr(c_rarg2, c_rarg2, 2);
103 switch(type) {
104 case T_BYTE: __ ldrsb (result, Address(robj, c_rarg2)); break;
105 case T_CHAR: __ ldrh (result, Address(robj, c_rarg2)); break;
106 case T_SHORT: __ ldrsh (result, Address(robj, c_rarg2)); break;
107 case T_DOUBLE:
108 case T_LONG: __ ldrd (result, Address(robj, c_rarg2)); break;
109 default: ShouldNotReachHere();
110 }
111 }
112 }
113 __ lea(rscratch2, SafepointSynchronize::safepoint_counter_addr());
114 // rscratch2 is address dependent on result.
115 // TODO Do we need to force dependency on r1 too?
116 __ eor(rscratch2, rscratch2, result);
117 __ eor(rscratch2, rscratch2, result);
118 __ ldr(rscratch2, rscratch2);
119 __ cmp(rcounter, rscratch2);
120
121 #ifdef HARD_FLOAT_CC
122 switch (type) {
123 case T_FLOAT: __ vmov_f32(d0, result, Assembler::EQ); break;
124 case T_DOUBLE: __ vmov_f64(d0, r0, r1, Assembler::EQ); break; // Change me if result changes
125 default: break;
126 }
127 #endif//HARD_FLOAT_CC
128
129 __ add(sp, sp, nargs * wordSize, Assembler::EQ); // Pop args if we don't need them.
130 __ b(lr, Assembler::EQ);
131
132 // Restore args for slowcase call into the vm
133 __ ldmia(sp, args);
134
135 // Slowcase
136 slowcase_entry_pclist[count++] = __ pc();
137 __ bind(slow);
138
139 address slow_case_addr = NULL;
140 switch (type) {
141 case T_BOOLEAN: slow_case_addr = jni_GetBooleanField_addr(); break;
142 case T_BYTE: slow_case_addr = jni_GetByteField_addr(); break;
143 case T_CHAR: slow_case_addr = jni_GetCharField_addr(); break;
144 case T_SHORT: slow_case_addr = jni_GetShortField_addr(); break;
145 case T_INT: slow_case_addr = jni_GetIntField_addr(); break;
146 case T_LONG: slow_case_addr = jni_GetLongField_addr(); break;
147 case T_FLOAT: slow_case_addr = jni_GetFloatField_addr(); break;
148 case T_DOUBLE: slow_case_addr = jni_GetDoubleField_addr(); break;
149 default: ShouldNotReachHere();
150 }
151
152 {
153 __ enter();
154 __ lea(rscratch2, ExternalAddress(slow_case_addr));
155 __ bl(rscratch2);
156 __ maybe_isb();
157 __ leave();
158 __ b(lr);
159 }
160 __ flush ();
161
162 return fast_entry;
163 }
164
165 address JNI_FastGetField::generate_fast_get_boolean_field() {
166 return generate_fast_get_int_field0(T_BOOLEAN);
167 }
168
169 address JNI_FastGetField::generate_fast_get_byte_field() {
170 return generate_fast_get_int_field0(T_BYTE);
171 }
172
173 address JNI_FastGetField::generate_fast_get_char_field() {
174 return generate_fast_get_int_field0(T_CHAR);
175 }
176
177 address JNI_FastGetField::generate_fast_get_short_field() {
178 return generate_fast_get_int_field0(T_SHORT);
179 }
180
181 address JNI_FastGetField::generate_fast_get_int_field() {
182 return generate_fast_get_int_field0(T_INT);
183 }
184
185 address JNI_FastGetField::generate_fast_get_long_field() {
186 return generate_fast_get_int_field0(T_LONG);
187 }
188
189 address JNI_FastGetField::generate_fast_get_float_field() {
190 return generate_fast_get_int_field0(T_FLOAT);
191 }
192
193 address JNI_FastGetField::generate_fast_get_double_field() {
194 return generate_fast_get_int_field0(T_DOUBLE);
195 }