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1 /*
2  * Copyright (C) 2019 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 #pragma once
18 
19 #include <android/binder_ibinder.h>
20 
21 __BEGIN_DECLS
22 
23 /**
24  * Indicates that this transaction is coupled w/ vendor.img
25  */
26 constexpr binder_flags_t FLAG_PRIVATE_VENDOR = 0x10000000;
27 
28 #if defined(__ANDROID_VENDOR__)
29 
30 /**
31  * Private addition to binder_flag_t.
32  */
33 enum {
34     FLAG_PRIVATE_LOCAL = FLAG_PRIVATE_VENDOR,
35 };
36 
37 /**
38  * This interface has the stability of the vendor image.
39  */
40 void AIBinder_markVendorStability(AIBinder* binder);
41 
AIBinder_markCompilationUnitStability(AIBinder * binder)42 static inline void AIBinder_markCompilationUnitStability(AIBinder* binder) {
43     AIBinder_markVendorStability(binder);
44 }
45 
46 /**
47  * Given a binder interface at a certain stability, there may be some
48  * requirements associated with that higher stability level. For instance, a
49  * VINTF stability binder is required to be in the VINTF manifest. This API
50  * can be called to use that same interface within the vendor partition.
51  *
52  * WARNING: you must hold on to a binder instance after this is set, while you
53  * are using it. If you get a binder (e.g. `...->asBinder().get()`), you must
54  * save this binder and then
55  * use it. For instance:
56  *
57  *     auto binder = ...->asBinder();
58  *     AIBinder_forceDowngradeToVendorStability(binder.get());
59  *     doSomething(binder);
60  */
61 void AIBinder_forceDowngradeToVendorStability(AIBinder* binder);
62 
AIBinder_forceDowngradeToLocalStability(AIBinder * binder)63 static inline void AIBinder_forceDowngradeToLocalStability(AIBinder* binder) {
64     AIBinder_forceDowngradeToVendorStability(binder);
65 }
66 
67 #else  // defined(__ANDROID_VENDOR__)
68 
69 enum {
70     FLAG_PRIVATE_LOCAL = 0,
71 };
72 
73 /**
74  * This interface has the stability of the system image.
75  */
76 __attribute__((weak)) void AIBinder_markSystemStability(AIBinder* binder);
77 
AIBinder_markCompilationUnitStability(AIBinder * binder)78 static inline void AIBinder_markCompilationUnitStability(AIBinder* binder) {
79     if (AIBinder_markSystemStability == nullptr) return;
80 
81     AIBinder_markSystemStability(binder);
82 }
83 
84 /**
85  * Given a binder interface at a certain stability, there may be some
86  * requirements associated with that higher stability level. For instance, a
87  * VINTF stability binder is required to be in the VINTF manifest. This API
88  * can be called to use that same interface within the system partition.
89  *
90  * WARNING: you must hold on to a binder instance after this is set, while you
91  * are using it. If you get a binder (e.g. `...->asBinder().get()`), you must
92  * save this binder and then
93  * use it. For instance:
94  *
95  *     auto binder = ...->asBinder();
96  *     AIBinder_forceDowngradeToSystemStability(binder.get());
97  *     doSomething(binder);
98  */
99 void AIBinder_forceDowngradeToSystemStability(AIBinder* binder);
100 
AIBinder_forceDowngradeToLocalStability(AIBinder * binder)101 static inline void AIBinder_forceDowngradeToLocalStability(AIBinder* binder) {
102     AIBinder_forceDowngradeToSystemStability(binder);
103 }
104 
105 #endif  // defined(__ANDROID_VENDOR__)
106 
107 /**
108  * WARNING: this is not expected to be used manually. When the build system has
109  * versioned checks in place for an interface that prevent it being changed year
110  * over year (specifically like those for @VintfStability stable AIDL
111  * interfaces), this could be called. Calling this without this or equivalent
112  * infrastructure will lead to de facto frozen APIs or GSI test failures.
113  *
114  * This interface has system<->vendor stability
115  */
116 // b/227835797 - can't use __INTRODUCED_IN(30) because old targets load this code
117 #if defined(__ANDROID_MIN_SDK_VERSION__) && __ANDROID_MIN_SDK_VERSION__ < 30
118 __attribute__((weak))
119 #endif  // defined(__ANDROID_MIN_SDK_VERSION__) && __ANDROID_MIN_SDK_VERSION__ < 30
120 void AIBinder_markVintfStability(AIBinder* binder);
121 
122 __END_DECLS
123