1 // 2 // Copyright (C) 2017 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 #ifndef NATIVE_BRIDGE_SUPPORT_VDSO_INTERCEPTABLE_FUNCTIONS_H_ 18 #define NATIVE_BRIDGE_SUPPORT_VDSO_INTERCEPTABLE_FUNCTIONS_H_ 19 20 #include <assert.h> 21 #include <stdint.h> 22 23 #include "native_bridge_support/vdso/vdso.h" 24 25 #if defined(__arm__) 26 #define INTERCEPTABLE_STUB_ASM_FUNCTION(name) \ 27 extern "C" void __attribute((target("arm"), naked)) name() { \ 28 __asm__ __volatile__( \ 29 "ldr r3, =0\n" \ 30 "bx r3"); \ 31 } 32 #elif defined(__aarch64__) 33 #define INTERCEPTABLE_STUB_ASM_FUNCTION(name) \ 34 extern "C" void __attribute((naked)) name() { \ 35 __asm__ __volatile__( \ 36 "ldr x3, =0\n" \ 37 "blr x3"); \ 38 } 39 #else 40 #error Unknown architecture, only arm and aarch64 are supported. 41 #endif 42 43 #define DEFINE_INTERCEPTABLE_STUB_VARIABLE(name) uintptr_t name; 44 45 #define INIT_INTERCEPTABLE_STUB_VARIABLE(library_name, name) \ 46 native_bridge_intercept_symbol(&name, library_name, #name) 47 48 #define DEFINE_INTERCEPTABLE_STUB_FUNCTION(name) \ 49 extern "C" void name(); \ 50 INTERCEPTABLE_STUB_ASM_FUNCTION(name) 51 52 #define INIT_INTERCEPTABLE_STUB_FUNCTION(library_name, name) \ 53 native_bridge_intercept_symbol(reinterpret_cast<void*>(name), library_name, #name) 54 55 #endif // NATIVE_BRIDGE_SUPPORT_VDSO_INTERCEPTABLE_FUNCTIONS_H_ 56