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