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/assembler.inline.hpp"
27 #include "assembler_arm.inline.hpp"
28 #include "code/relocInfo.hpp"
29 #include "nativeInst_arm.hpp"
30 #include "oops/compressedOops.inline.hpp"
31 #include "oops/oop.hpp"
32 #include "runtime/orderAccess.hpp"
33 #include "runtime/safepoint.hpp"
34
35 void Relocation::pd_set_data_value(address x, intptr_t o, bool verify_only) {
36
37 NativeMovConstReg* ni = nativeMovConstReg_at(addr());
38 #if defined(AARCH64) && defined(COMPILER2)
39 if (ni->is_movz()) {
40 assert(type() == relocInfo::oop_type, "!");
41 if (verify_only) {
42 uintptr_t d = ni->data();
43 guarantee((d >> 32) == 0, "not narrow oop");
44 narrowOop no = d;
45 oop o = CompressedOops::decode(no);
46 guarantee(cast_from_oop<intptr_t>(o) == (intptr_t)x, "instructions must match");
47 } else {
48 ni->set_data((intptr_t)x);
49 }
50 return;
51 }
52 #endif
53 if (verify_only) {
54 guarantee(ni->data() == (intptr_t)(x + o), "instructions must match");
55 } else {
56 ni->set_data((intptr_t)(x + o));
57 }
58 }
59
60 address Relocation::pd_call_destination(address orig_addr) {
61 address pc = addr();
62
63 int adj = 0;
64 if (orig_addr != NULL) {
65 // We just moved this call instruction from orig_addr to addr().
66 // This means that, when relative, its target will appear to have grown by addr() - orig_addr.
67 adj = orig_addr - pc;
68 }
69
70 RawNativeInstruction* ni = rawNativeInstruction_at(pc);
71
72 #if (!defined(AARCH64))
73 if (NOT_AARCH64(ni->is_add_lr()) AARCH64_ONLY(ni->is_adr_aligned_lr())) {
74 // On arm32, skip the optional 'add LR, PC, #offset'
75 // (Allowing the jump support code to handle fat_call)
76 pc = ni->next_raw_instruction_address();
77 ni = nativeInstruction_at(pc);
78 }
79 #endif
80
81 if (AARCH64_ONLY(ni->is_call()) NOT_AARCH64(ni->is_bl())) {
82 // For arm32, fat_call are handled by is_jump for the new 'ni',
83 // requiring only to support is_bl.
84 //
85 // For AARCH64, skipping a leading adr is not sufficient
86 // to reduce calls to a simple bl.
87 return rawNativeCall_at(pc)->destination(adj);
88 }
89
90 if (ni->is_jump()) {
91 return rawNativeJump_at(pc)->jump_destination(adj);
92 }
93 ShouldNotReachHere();
94 return NULL;
95 }
96
97 void Relocation::pd_set_call_destination(address x) {
98 address pc = addr();
99 NativeInstruction* ni = nativeInstruction_at(pc);
100
101 #if (!defined(AARCH64))
102 if (NOT_AARCH64(ni->is_add_lr()) AARCH64_ONLY(ni->is_adr_aligned_lr())) {
103 // On arm32, skip the optional 'add LR, PC, #offset'
104 // (Allowing the jump support code to handle fat_call)
105 pc = ni->next_raw_instruction_address();
106 ni = nativeInstruction_at(pc);
107 }
108 #endif
109
110 if (AARCH64_ONLY(ni->is_call()) NOT_AARCH64(ni->is_bl())) {
111 // For arm32, fat_call are handled by is_jump for the new 'ni',
112 // requiring only to support is_bl.
113 //
114 // For AARCH64, skipping a leading adr is not sufficient
115 // to reduce calls to a simple bl.
116 rawNativeCall_at(pc)->set_destination(x);
117 return;
118 }
119
120 if (ni->is_jump()) { // raw jump
121 rawNativeJump_at(pc)->set_jump_destination(x);
122 return;
123 }
124 ShouldNotReachHere();
125 }
126
127
128 address* Relocation::pd_address_in_code() {
129 return (address*)addr();
130 }
131
132 address Relocation::pd_get_address_from_code() {
133 return *pd_address_in_code();
134 }
135
136 void poll_Relocation::fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest) {
137 }
138
139 void metadata_Relocation::pd_fix_value(address x) {
140 assert(! addr_in_const(), "Do not use");
141 #ifdef AARCH64
142 #ifdef COMPILER2
143 NativeMovConstReg* ni = nativeMovConstReg_at(addr());
144 if (ni->is_mov_slow()) {
145 return;
146 }
147 #endif
148 set_value(x);
149 #else
150 if (!VM_Version::supports_movw()) {
151 set_value(x);
152 #ifdef ASSERT
153 } else {
154 // the movw/movt data should be correct
155 NativeMovConstReg* ni = nativeMovConstReg_at(addr());
156 assert(ni->is_movw(), "not a movw");
157 // The following assert should be correct but the shared code
158 // currently 'fixes' the metadata instructions before the
159 // metadata_table is copied in the new method (see
160 // JDK-8042845). This means that 'x' (which comes from the table)
161 // does not match the value inlined in the code (which is
162 // correct). Failure can be temporarily ignored since the code is
163 // correct and the table is copied shortly afterward.
164 //
165 // assert(ni->data() == (int)x, "metadata relocation mismatch");
166 #endif
167 }
168 #endif // !AARCH64
169 }