1 /*
2 * Copyright (C) 2024 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "translator.h"
18
19 #include "berberis/base/checks.h"
20 #include "berberis/guest_os_primitives/guest_map_shadow.h"
21 #include "berberis/guest_state/guest_addr.h"
22 #include "berberis/guest_state/guest_state_opaque.h"
23 #include "berberis/interpreter/riscv64/interpreter.h"
24 #include "berberis/runtime_primitives/host_code.h"
25 #include "berberis/runtime_primitives/runtime_library.h"
26 #include "berberis/runtime_primitives/translation_cache.h"
27
28 namespace berberis {
29
InitTranslatorArch()30 void InitTranslatorArch() {}
31
TranslateRegion(GuestAddr pc)32 void TranslateRegion(GuestAddr pc) {
33 using Kind = GuestCodeEntry::Kind;
34
35 TranslationCache* cache = TranslationCache::GetInstance();
36
37 GuestCodeEntry* entry = cache->AddAndLockForTranslation(pc, 0);
38 if (!entry) {
39 return;
40 }
41
42 GuestMapShadow* guest_map_shadow = GuestMapShadow::GetInstance();
43 auto [is_executable, insn_size] = IsPcExecutable(pc, guest_map_shadow);
44 if (!is_executable) {
45 cache->SetTranslatedAndUnlock(pc, entry, insn_size, Kind::kSpecialHandler, {kEntryNoExec, 0});
46 return;
47 }
48
49 cache->SetTranslatedAndUnlock(pc, entry, insn_size, Kind::kInterpreted, {kEntryInterpret, 0});
50 }
51
52 // ATTENTION: This symbol gets called directly, without PLT. To keep text
53 // sharable we should prevent preemption of this symbol, so do not export it!
54 // TODO(b/232598137): may be set default visibility to protected instead?
berberis_HandleNotTranslated(ThreadState * state)55 extern "C" __attribute__((used, __visibility__("hidden"))) void berberis_HandleNotTranslated(
56 ThreadState* state) {
57 TranslateRegion(state->cpu.insn_addr);
58 }
59
berberis_HandleInterpret(ThreadState * state)60 extern "C" __attribute__((used, __visibility__("hidden"))) void berberis_HandleInterpret(
61 ThreadState* state) {
62 InterpretInsn(state);
63 }
64
berberis_GetDispatchAddress(ThreadState * state)65 extern "C" __attribute__((used, __visibility__("hidden"))) const void* berberis_GetDispatchAddress(
66 ThreadState* state) {
67 CHECK(state);
68 if (ArePendingSignalsPresent(*state)) {
69 return AsHostCode(kEntryExitGeneratedCode);
70 }
71 return AsHostCode(TranslationCache::GetInstance()->GetHostCodePtr(state->cpu.insn_addr)->load());
72 }
73
74 } // namespace berberis
75