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