vdso/include/native_bridge_support/vdso/interceptable_functions.h

//
// Copyright (C) 2017 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//

#ifndef NATIVE_BRIDGE_SUPPORT_VDSO_INTERCEPTABLE_FUNCTIONS_H_
#define NATIVE_BRIDGE_SUPPORT_VDSO_INTERCEPTABLE_FUNCTIONS_H_

#include <assert.h>
#include <stdint.h>

#include "native_bridge_support/vdso/vdso.h"

#if defined(__arm__)
#define INTERCEPTABLE_STUB_ASM_FUNCTION(name)                  \
  extern "C" void __attribute((target("arm"), naked)) name() { \
    __asm__ __volatile__(                                      \
        "ldr r3, =0\n"                                         \
        "bx r3");                                              \
  }
#elif defined(__aarch64__)
#define INTERCEPTABLE_STUB_ASM_FUNCTION(name)   \
  extern "C" void __attribute((naked)) name() { \
    __asm__ __volatile__(                       \
        "ldr x3, =0\n"                          \
        "blr x3");                              \
  }
#else
#error Unknown architecture, only arm and aarch64 are supported.
#endif

#define DEFINE_INTERCEPTABLE_STUB_VARIABLE(name) uintptr_t name;

#define INIT_INTERCEPTABLE_STUB_VARIABLE(library_name, name) \
  native_bridge_intercept_symbol(&name, library_name, #name)

#define DEFINE_INTERCEPTABLE_STUB_FUNCTION(name) \
  extern "C" void name();                        \
  INTERCEPTABLE_STUB_ASM_FUNCTION(name)

#define INIT_INTERCEPTABLE_STUB_FUNCTION(library_name, name) \
  native_bridge_intercept_symbol(reinterpret_cast<void*>(name), library_name, #name)

#endif  // NATIVE_BRIDGE_SUPPORT_VDSO_INTERCEPTABLE_FUNCTIONS_H_