1 /*
2 * Copyright (c) 1998, 2025, 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 "asm/macroAssembler.hpp"
27 #include "code/nmethod.hpp"
28 #include "code/relocInfo.hpp"
29 #include "nativeInst_aarch64.hpp"
30 #include "oops/oop.inline.hpp"
31 #include "runtime/safepoint.hpp"
32
33
34 void Relocation::pd_set_data_value(address x, bool verify_only) {
35 if (verify_only)
36 return;
37
38 int bytes;
39
40 switch(type()) {
41 case relocInfo::oop_type:
42 {
43 oop_Relocation *reloc = (oop_Relocation *)this;
44 if (NativeInstruction::is_ldr_literal_at(addr())) {
45 address constptr = (address)code()->oop_addr_at(reloc->oop_index());
46 bytes = MacroAssembler::pd_patch_instruction_size(addr(), constptr);
47 assert(*(address*)constptr == x, "error in oop relocation");
48 } else{
49 bytes = MacroAssembler::patch_oop(addr(), x);
50 }
51 }
52 break;
53 default:
54 bytes = MacroAssembler::pd_patch_instruction_size(addr(), x);
55 break;
56 }
57 ICache::invalidate_range(addr(), bytes);
58 }
59
60 address Relocation::pd_call_destination(address orig_addr) {
61 assert(is_call(), "should be a call here");
62 if (orig_addr == nullptr) {
63 if (NativeCall::is_call_at(addr())) {
64 NativeCall* call = nativeCall_at(addr());
65 return call->destination();
66 }
67 } else {
68 address new_addr = MacroAssembler::pd_call_destination(orig_addr);
69 // If call is branch to self, don't try to relocate it, just leave it
70 // as branch to self. This happens during code generation if the code
71 // buffer expands. It will be relocated to the trampoline above once
72 // code generation is complete.
73 new_addr = (new_addr == orig_addr) ? addr() : new_addr;
74 return new_addr;
75 }
76 return MacroAssembler::pd_call_destination(addr());
77 }
78
79
80 void Relocation::pd_set_call_destination(address x) {
81 assert(is_call(), "should be a call here");
82 if (NativeCall::is_call_at(addr())) {
83 NativeCall* call = nativeCall_at(addr());
84 call->set_destination(x);
85 } else {
86 MacroAssembler::pd_patch_instruction(addr(), x);
87 }
88 assert(pd_call_destination(addr()) == x, "fail in reloc");
89 }
90
91 void trampoline_stub_Relocation::pd_fix_owner_after_move() {
92 NativeCall* call = nativeCall_at(owner());
93 assert(call->raw_destination() == owner(), "destination should be empty");
94 address trampoline = addr();
95 address dest = nativeCallTrampolineStub_at(trampoline)->destination();
96 if (!Assembler::reachable_from_branch_at(owner(), dest)) {
97 dest = trampoline;
98 }
99 call->set_destination(dest);
100 }
101
102
103 address* Relocation::pd_address_in_code() {
104 return (address*)(addr() + 8);
105 }
106
107
108 address Relocation::pd_get_address_from_code() {
109 return MacroAssembler::pd_call_destination(addr());
110 }
111
112 void poll_Relocation::fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest) {
113 if (NativeInstruction::maybe_cpool_ref(addr())) {
114 address old_addr = old_addr_for(addr(), src, dest);
115 MacroAssembler::pd_patch_instruction(addr(), MacroAssembler::target_addr_for_insn(old_addr));
116 }
117 }
118
119 void metadata_Relocation::pd_fix_value(address x) {
120 }