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