1 /*
2 * Copyright (c) 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.inline.hpp"
27 #include "gc/g1/g1BarrierSet.hpp"
28 #include "gc/g1/g1BarrierSetAssembler.hpp"
29 #include "gc/g1/g1CardTable.hpp"
30 #include "gc/g1/heapRegion.hpp"
31 #include "gc/shared/collectedHeap.hpp"
32 #include "interpreter/interp_masm.hpp"
33 #include "runtime/sharedRuntime.hpp"
34 #include "runtime/thread.hpp"
35 #include "utilities/macros.hpp"
36
37 #define __ masm->
38
39 #ifdef PRODUCT
40 #define BLOCK_COMMENT(str) /* nothing */
41 #else
42 #define BLOCK_COMMENT(str) __ block_comment(str)
43 #endif
44
45 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":")
46
47 void G1BarrierSetAssembler::gen_write_ref_array_pre_barrier(MacroAssembler* masm, DecoratorSet decorators,
48 Register addr, Register count, int callee_saved_regs) {
49 bool dest_uninitialized = (decorators & AS_DEST_NOT_INITIALIZED) != 0;
50 if (!dest_uninitialized) {
51 assert( addr->encoding() < callee_saved_regs, "addr must be saved");
52 assert(count->encoding() < callee_saved_regs, "count must be saved");
53
54 BLOCK_COMMENT("PreBarrier");
55
56 #ifdef AARCH64
57 callee_saved_regs = align_up(callee_saved_regs, 2);
58 for (int i = 0; i < callee_saved_regs; i += 2) {
59 __ raw_push(as_Register(i), as_Register(i+1));
60 }
61 #else
62 RegisterSet saved_regs = RegisterSet(R0, as_Register(callee_saved_regs-1));
63 __ push(saved_regs | R9ifScratched);
64 #endif // AARCH64
65
66 if (addr != R0) {
67 assert_different_registers(count, R0);
68 __ mov(R0, addr);
69 }
70 #ifdef AARCH64
71 __ zero_extend(R1, count, 32); // G1BarrierSet::write_ref_array_pre_*_entry takes size_t
72 #else
73 if (count != R1) {
74 __ mov(R1, count);
75 }
76 #endif // AARCH64
77
78 if (UseCompressedOops) {
79 __ call(CAST_FROM_FN_PTR(address, G1BarrierSet::write_ref_array_pre_narrow_oop_entry));
80 } else {
81 __ call(CAST_FROM_FN_PTR(address, G1BarrierSet::write_ref_array_pre_oop_entry));
82 }
83
84 #ifdef AARCH64
85 for (int i = callee_saved_regs - 2; i >= 0; i -= 2) {
86 __ raw_pop(as_Register(i), as_Register(i+1));
87 }
88 #else
89 __ pop(saved_regs | R9ifScratched);
90 #endif // AARCH64
91 }
92 }
93
94 void G1BarrierSetAssembler::gen_write_ref_array_post_barrier(MacroAssembler* masm, DecoratorSet decorators,
95 Register addr, Register count, Register tmp) {
96
97 BLOCK_COMMENT("G1PostBarrier");
98 if (addr != R0) {
99 assert_different_registers(count, R0);
100 __ mov(R0, addr);
101 }
102 #ifdef AARCH64
103 __ zero_extend(R1, count, 32); // G1BarrierSet::write_ref_array_post_entry takes size_t
104 #else
105 if (count != R1) {
106 __ mov(R1, count);
107 }
108 #if R9_IS_SCRATCHED
109 // Safer to save R9 here since callers may have been written
110 // assuming R9 survives. This is suboptimal but is not in
111 // general worth optimizing for the few platforms where R9
112 // is scratched. Note that the optimization might not be to
113 // difficult for this particular call site.
114 __ push(R9);
115 #endif // !R9_IS_SCRATCHED
116 #endif // !AARCH64
117 __ call(CAST_FROM_FN_PTR(address, G1BarrierSet::write_ref_array_post_entry));
118 #ifndef AARCH64
119 #if R9_IS_SCRATCHED
120 __ pop(R9);
121 #endif // !R9_IS_SCRATCHED
122 #endif // !AARCH64
123 }