1 /*
2 * Copyright (c) 1998, 2024, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2014, Red Hat Inc. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 #include "precompiled.hpp"
27 #include "asm/macroAssembler.hpp"
28 #include "code/nmethod.hpp"
29 #include "code/relocInfo.hpp"
30 #include "nativeInst_aarch64.hpp"
31 #include "oops/oop.inline.hpp"
32 #include "runtime/safepoint.hpp"
33
34
35 void Relocation::pd_set_data_value(address x, bool verify_only) {
36 if (verify_only)
37 return;
38
39 int bytes;
40
41 switch(type()) {
42 case relocInfo::oop_type:
43 {
44 oop_Relocation *reloc = (oop_Relocation *)this;
45 if (NativeInstruction::is_ldr_literal_at(addr())) {
46 address constptr = (address)code()->oop_addr_at(reloc->oop_index());
47 bytes = MacroAssembler::pd_patch_instruction_size(addr(), constptr);
48 assert(*(address*)constptr == x, "error in oop relocation");
49 } else{
50 bytes = MacroAssembler::patch_oop(addr(), x);
51 }
52 }
53 break;
54 default:
55 bytes = MacroAssembler::pd_patch_instruction_size(addr(), x);
56 break;
57 }
58 ICache::invalidate_range(addr(), bytes);
59 }
60
61 address Relocation::pd_call_destination(address orig_addr) {
62 assert(is_call(), "should be a call here");
63 if (orig_addr == nullptr) {
64 if (NativeCall::is_call_at(addr())) {
65 NativeCall* call = nativeCall_at(addr());
66 return call->destination();
67 }
68 } else {
69 address new_addr = MacroAssembler::pd_call_destination(orig_addr);
70 // If call is branch to self, don't try to relocate it, just leave it
71 // as branch to self. This happens during code generation if the code
72 // buffer expands. It will be relocated to the trampoline above once
73 // code generation is complete.
74 new_addr = (new_addr == orig_addr) ? addr() : new_addr;
75 return new_addr;
76 }
77 return MacroAssembler::pd_call_destination(addr());
78 }
79
80
81 void Relocation::pd_set_call_destination(address x) {
82 assert(is_call(), "should be a call here");
83 if (NativeCall::is_call_at(addr())) {
84 NativeCall* call = nativeCall_at(addr());
85 call->set_destination(x);
86 } else {
87 MacroAssembler::pd_patch_instruction(addr(), x);
88 }
89 assert(pd_call_destination(addr()) == x, "fail in reloc");
90 }
91
92 void trampoline_stub_Relocation::pd_fix_owner_after_move() {
93 NativeCall* call = nativeCall_at(owner());
94 assert(call->raw_destination() == owner(), "destination should be empty");
95 address trampoline = addr();
96 address dest = nativeCallTrampolineStub_at(trampoline)->destination();
97 if (!Assembler::reachable_from_branch_at(owner(), dest)) {
98 dest = trampoline;
99 }
100 call->set_destination(dest);
101 }
102
103
104 address* Relocation::pd_address_in_code() {
105 return (address*)(addr() + 8);
106 }
107
108
109 address Relocation::pd_get_address_from_code() {
110 return MacroAssembler::pd_call_destination(addr());
111 }
112
113 void poll_Relocation::fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest) {
114 if (NativeInstruction::maybe_cpool_ref(addr())) {
115 address old_addr = old_addr_for(addr(), src, dest);
116 MacroAssembler::pd_patch_instruction(addr(), MacroAssembler::target_addr_for_insn(old_addr));
117 }
118 }
119
120 void metadata_Relocation::pd_fix_value(address x) {
121 }