1 /*
2 * Copyright (C) 2012 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 <android-base/logging.h>
18
19 #include "arch/arm/jni_frame_arm.h"
20 #include "arch/arm64/jni_frame_arm64.h"
21 #include "arch/instruction_set.h"
22 #include "arch/x86/jni_frame_x86.h"
23 #include "arch/x86_64/jni_frame_x86_64.h"
24 #include "art_method-inl.h"
25 #include "entrypoints/entrypoint_utils.h"
26 #include "jni/java_vm_ext.h"
27 #include "mirror/object-inl.h"
28 #include "scoped_thread_state_change-inl.h"
29 #include "thread.h"
30
31 namespace art {
32
33 // Used by the JNI dlsym stub to find the native method to invoke if none is registered.
artFindNativeMethodRunnable(Thread * self)34 extern "C" const void* artFindNativeMethodRunnable(Thread* self)
35 REQUIRES_SHARED(Locks::mutator_lock_) {
36 Locks::mutator_lock_->AssertSharedHeld(self); // We come here as Runnable.
37 ArtMethod* method = self->GetCurrentMethod(nullptr);
38 DCHECK(method != nullptr);
39
40 // Lookup symbol address for method, on failure we'll return null with an exception set,
41 // otherwise we return the address of the method we found.
42 JavaVMExt* vm = down_cast<JNIEnvExt*>(self->GetJniEnv())->GetVm();
43 void* native_code = vm->FindCodeForNativeMethod(method);
44 if (native_code == nullptr) {
45 self->AssertPendingException();
46 return nullptr;
47 }
48 // Register so that future calls don't come here
49 return method->RegisterNative(native_code);
50 }
51
52 // Used by the JNI dlsym stub to find the native method to invoke if none is registered.
artFindNativeMethod(Thread * self)53 extern "C" const void* artFindNativeMethod(Thread* self) {
54 DCHECK_EQ(self, Thread::Current());
55 Locks::mutator_lock_->AssertNotHeld(self); // We come here as Native.
56 ScopedObjectAccess soa(self);
57 return artFindNativeMethodRunnable(self);
58 }
59
artCriticalNativeOutArgsSize(ArtMethod * method)60 extern "C" size_t artCriticalNativeOutArgsSize(ArtMethod* method)
61 REQUIRES_SHARED(Locks::mutator_lock_) {
62 uint32_t shorty_len;
63 const char* shorty = method->GetShorty(&shorty_len);
64 switch (kRuntimeISA) {
65 case InstructionSet::kArm:
66 case InstructionSet::kThumb2:
67 return arm::GetCriticalNativeOutArgsSize(shorty, shorty_len);
68 case InstructionSet::kArm64:
69 return arm64::GetCriticalNativeOutArgsSize(shorty, shorty_len);
70 case InstructionSet::kX86:
71 return x86::GetCriticalNativeOutArgsSize(shorty, shorty_len);
72 case InstructionSet::kX86_64:
73 return x86_64::GetCriticalNativeOutArgsSize(shorty, shorty_len);
74 default:
75 UNIMPLEMENTED(FATAL) << kRuntimeISA;
76 UNREACHABLE();
77 }
78 }
79
80 } // namespace art
81