1 /*
2 * Copyright (c) 2022, 2023, 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.
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23 */
24
25 #ifndef CPU_AARCH64_CONTINUATIONHELPER_AARCH64_INLINE_HPP
26 #define CPU_AARCH64_CONTINUATIONHELPER_AARCH64_INLINE_HPP
27
28 #include "runtime/continuationHelper.hpp"
29
30 #include "runtime/continuationEntry.inline.hpp"
31 #include "runtime/frame.inline.hpp"
32 #include "runtime/registerMap.hpp"
33 #include "utilities/macros.hpp"
34
35 template<typename FKind>
36 static inline intptr_t** link_address(const frame& f) {
37 assert(FKind::is_instance(f), "");
38 return FKind::interpreted
39 ? (intptr_t**)(f.fp() + frame::link_offset)
40 : (intptr_t**)(f.unextended_sp() + f.cb()->frame_size() - frame::sender_sp_offset);
41 }
42
43 static inline void patch_return_pc_with_preempt_stub(frame& f) {
44 // Unlike x86 we don't know where in the callee frame the return pc is
45 // saved so we can't patch the return from the VM call back to Java. If
46 // the target is coming from compiled code we will patch the return from
47 // the safepoint handler blob back to the compiled method instead. If
48 // it's coming from the interpreter, the target will check for preemption
49 // once it returns to the interpreter and will manually jump to the
50 // preempt stub.
51 if (!f.is_interpreted_frame()) {
52 assert(f.is_runtime_frame(), "invariant");
53 intptr_t* caller_sp = f.sp() + f.cb()->frame_size();
54 caller_sp[-1] = (intptr_t)StubRoutines::cont_preempt_stub();
55 } else {
56 JavaThread *thread = JavaThread::current();
57 thread->set_preempt_alternate_return(StubRoutines::cont_preempt_stub());
58 thread->set_preempt_alternate_return_sp((address)f.sp());
59 }
60 }
61
62 inline int ContinuationHelper::frame_align_words(int size) {
63 #ifdef _LP64
64 return size & 1;
65 #else
66 return 0;
67 #endif
68 }
69
70 inline intptr_t* ContinuationHelper::frame_align_pointer(intptr_t* sp) {
71 #ifdef _LP64
72 sp = align_down(sp, frame::frame_alignment);
73 #endif
74 return sp;
75 }
76
77 template<typename FKind>
78 inline void ContinuationHelper::update_register_map(const frame& f, RegisterMap* map) {
79 frame::update_map_with_saved_link(map, link_address<FKind>(f));
80 }
81
82 inline void ContinuationHelper::update_register_map_with_callee(const frame& f, RegisterMap* map) {
83 frame::update_map_with_saved_link(map, ContinuationHelper::Frame::callee_link_address(f));
84 }
85
86 inline void ContinuationHelper::push_pd(const frame& f) {
87 *(intptr_t**)(f.sp() - frame::sender_sp_offset) = f.fp();
88 }
89
90 #define CPU_OVERRIDES_RETURN_ADDRESS_ACCESSORS
91
92 inline address ContinuationHelper::return_address_at(intptr_t* sp) {
93 return pauth_strip_verifiable(*(address*)sp);
94 }
95
96 inline void ContinuationHelper::patch_return_address_at(intptr_t* sp,
97 address pc) {
98 *(address*)sp = pauth_sign_return_address(pc);
99 }
100
101 inline void ContinuationHelper::set_anchor_to_entry_pd(JavaFrameAnchor* anchor, ContinuationEntry* entry) {
102 anchor->set_last_Java_fp(entry->entry_fp());
103 }
104
105 inline void ContinuationHelper::set_anchor_pd(JavaFrameAnchor* anchor, intptr_t* sp) {
106 intptr_t* fp = *(intptr_t**)(sp - frame::sender_sp_offset);
107 anchor->set_last_Java_fp(fp);
108 }
109
110 #ifdef ASSERT
111 inline bool ContinuationHelper::Frame::assert_frame_laid_out(frame f) {
112 intptr_t* sp = f.sp();
113 address pc = ContinuationHelper::return_address_at(
114 sp - frame::sender_sp_ret_address_offset());
115 intptr_t* fp = *(intptr_t**)(sp - frame::sender_sp_offset);
116 assert(f.raw_pc() == pc, "f.ra_pc: " INTPTR_FORMAT " actual: " INTPTR_FORMAT, p2i(f.raw_pc()), p2i(pc));
117 assert(f.fp() == fp, "f.fp: " INTPTR_FORMAT " actual: " INTPTR_FORMAT, p2i(f.fp()), p2i(fp));
118 return f.raw_pc() == pc && f.fp() == fp;
119 }
120 #endif
121
122 inline intptr_t** ContinuationHelper::Frame::callee_link_address(const frame& f) {
123 return (intptr_t**)(f.sp() - frame::sender_sp_offset);
124 }
125
126 inline address* ContinuationHelper::Frame::return_pc_address(const frame& f) {
127 return (address*)(f.real_fp() - 1);
128 }
129
130 inline address* ContinuationHelper::InterpretedFrame::return_pc_address(const frame& f) {
131 return (address*)(f.fp() + frame::return_addr_offset);
132 }
133
134 inline void ContinuationHelper::InterpretedFrame::patch_sender_sp(frame& f, const frame& caller) {
135 intptr_t* sp = caller.unextended_sp();
136 assert(f.is_interpreted_frame(), "");
137 intptr_t* la = f.addr_at(frame::interpreter_frame_sender_sp_offset);
138 *la = f.is_heap_frame() ? (intptr_t)(sp - f.fp()) : (intptr_t)sp;
139 }
140
141 inline address ContinuationHelper::Frame::real_pc(const frame& f) {
142 // Always used in assertions. Just strip it.
143 address* pc_addr = &(((address*) f.sp())[-1]);
144 return pauth_strip_pointer(*pc_addr);
145 }
146
147 inline void ContinuationHelper::Frame::patch_pc(const frame& f, address pc) {
148 address* pc_addr = &(((address*) f.sp())[-1]);
149 *pc_addr = pauth_sign_return_address(pc);
150 }
151
152 inline intptr_t* ContinuationHelper::InterpretedFrame::frame_top(const frame& f, InterpreterOopMap* mask) { // inclusive; this will be copied with the frame
153 // interpreter_frame_last_sp_offset, points to unextended_sp includes arguments in the frame
154 // interpreter_frame_initial_sp_offset excludes expression stack slots
155 int expression_stack_sz = expression_stack_size(f, mask);
156 intptr_t* res = (intptr_t*)f.at_relative(frame::interpreter_frame_initial_sp_offset) - expression_stack_sz;
157 assert(res == (intptr_t*)f.interpreter_frame_monitor_end() - expression_stack_sz, "");
158 assert(res >= f.unextended_sp(),
159 "res: " INTPTR_FORMAT " initial_sp: " INTPTR_FORMAT " last_sp: " INTPTR_FORMAT " unextended_sp: " INTPTR_FORMAT " expression_stack_size: %d",
160 p2i(res), p2i(f.addr_at(frame::interpreter_frame_initial_sp_offset)), f.at_relative_or_null(frame::interpreter_frame_last_sp_offset),
161 p2i(f.unextended_sp()), expression_stack_sz);
162 return res;
163 }
164
165 inline intptr_t* ContinuationHelper::InterpretedFrame::frame_bottom(const frame& f) { // exclusive; this will not be copied with the frame
166 return (intptr_t*)f.at_relative(frame::interpreter_frame_locals_offset) + 1; // exclusive, so we add 1 word
167 }
168
169 inline intptr_t* ContinuationHelper::InterpretedFrame::frame_top(const frame& f, int callee_argsize, bool callee_interpreted) {
170 return f.unextended_sp() + (callee_interpreted ? callee_argsize : 0);
171 }
172
173 inline intptr_t* ContinuationHelper::InterpretedFrame::callers_sp(const frame& f) {
174 return f.fp() + frame::metadata_words;
175 }
176
177 #endif // CPU_AARCH64_CONTINUATIONHELPER_AARCH64_INLINE_HPP