dlext.h revision a6c1279098f24a675d0df74ce1946f5d534b425e
1012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles)/* 2012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles) * Copyright (C) 2014 The Android Open Source Project 3012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles) 4012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles) * Licensed under the Apache License, Version 2.0 (the "License"); 5012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles) * you may not use this file except in compliance with the License. 6012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles) * You may obtain a copy of the License at 7012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles) * 8012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles) * http://www.apache.org/licenses/LICENSE-2.0 9012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles) * 10012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles) * Unless required by applicable law or agreed to in writing, software 11012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles) * distributed under the License is distributed on an "AS IS" BASIS, 12012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles) * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles) * See the License for the specific language governing permissions and 14012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles) * limitations under the License. 15012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles) */ 16012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles) 17012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles)#ifndef __ANDROID_DLEXT_H__ 18012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles)#define __ANDROID_DLEXT_H__ 19012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles) 20012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles)#include <stddef.h> 21012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles)#include <sys/cdefs.h> 22012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles) 23012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles)__BEGIN_DECLS 24012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles) 25012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles)/* bitfield definitions for android_dlextinfo.flags */ 26012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles)enum { 2712bbb9164578b6512b8b07a3fb093858244b7c7bTorne (Richard Coles) /* When set, the reserved_addr and reserved_size fields must point to an 2812bbb9164578b6512b8b07a3fb093858244b7c7bTorne (Richard Coles) * already-reserved region of address space which will be used to load the 2912bbb9164578b6512b8b07a3fb093858244b7c7bTorne (Richard Coles) * library if it fits. If the reserved region is not large enough, the load 3012bbb9164578b6512b8b07a3fb093858244b7c7bTorne (Richard Coles) * will fail. 3112bbb9164578b6512b8b07a3fb093858244b7c7bTorne (Richard Coles) */ 3212bbb9164578b6512b8b07a3fb093858244b7c7bTorne (Richard Coles) ANDROID_DLEXT_RESERVED_ADDRESS = 0x1, 3312bbb9164578b6512b8b07a3fb093858244b7c7bTorne (Richard Coles) 3412bbb9164578b6512b8b07a3fb093858244b7c7bTorne (Richard Coles) /* As DLEXT_RESERVED_ADDRESS, but if the reserved region is not large enough, 3512bbb9164578b6512b8b07a3fb093858244b7c7bTorne (Richard Coles) * the linker will choose an available address instead. 3612bbb9164578b6512b8b07a3fb093858244b7c7bTorne (Richard Coles) */ 3712bbb9164578b6512b8b07a3fb093858244b7c7bTorne (Richard Coles) ANDROID_DLEXT_RESERVED_ADDRESS_HINT = 0x2, 3812bbb9164578b6512b8b07a3fb093858244b7c7bTorne (Richard Coles) 39183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) /* When set, write the GNU RELRO section of the mapped library to relro_fd 40183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) * after relocation has been performed, to allow it to be reused by another 41183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) * process loading the same library at the same address. This implies 42183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) * ANDROID_DLEXT_USE_RELRO. 43183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) */ 44183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) ANDROID_DLEXT_WRITE_RELRO = 0x4, 45183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) 46183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) /* When set, compare the GNU RELRO section of the mapped library to relro_fd 47183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) * after relocation has been performed, and replace any relocated pages that 48183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) * are identical with a version mapped from the file. 49183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) */ 50183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) ANDROID_DLEXT_USE_RELRO = 0x8, 51183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) 5204dc91ae763adc403a14c88b4c46f77b3d2d71a3Dmitriy Ivanov /* Instruct dlopen to use library_fd instead of opening file by name. 5304dc91ae763adc403a14c88b4c46f77b3d2d71a3Dmitriy Ivanov * The filename parameter is still used to identify the library. 5404dc91ae763adc403a14c88b4c46f77b3d2d71a3Dmitriy Ivanov */ 5504dc91ae763adc403a14c88b4c46f77b3d2d71a3Dmitriy Ivanov ANDROID_DLEXT_USE_LIBRARY_FD = 0x10, 5604dc91ae763adc403a14c88b4c46f77b3d2d71a3Dmitriy Ivanov 57a6c1279098f24a675d0df74ce1946f5d534b425eDmitriy Ivanov /* If opening a library using library_fd read it starting at library_fd_offset. 5807e5bc152d8a3ad4c50808bb86f3c0f2c5e2f514Dmitriy Ivanov * This flag is only valid when ANDROID_DLEXT_USE_LIBRARY_FD is set. 5907e5bc152d8a3ad4c50808bb86f3c0f2c5e2f514Dmitriy Ivanov */ 6007e5bc152d8a3ad4c50808bb86f3c0f2c5e2f514Dmitriy Ivanov 61a6c1279098f24a675d0df74ce1946f5d534b425eDmitriy Ivanov ANDROID_DLEXT_USE_LIBRARY_FD_OFFSET = 0x20, 6207e5bc152d8a3ad4c50808bb86f3c0f2c5e2f514Dmitriy Ivanov 63012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles) /* Mask of valid bits */ 6412bbb9164578b6512b8b07a3fb093858244b7c7bTorne (Richard Coles) ANDROID_DLEXT_VALID_FLAG_BITS = ANDROID_DLEXT_RESERVED_ADDRESS | 65183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) ANDROID_DLEXT_RESERVED_ADDRESS_HINT | 66183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) ANDROID_DLEXT_WRITE_RELRO | 6704dc91ae763adc403a14c88b4c46f77b3d2d71a3Dmitriy Ivanov ANDROID_DLEXT_USE_RELRO | 6807e5bc152d8a3ad4c50808bb86f3c0f2c5e2f514Dmitriy Ivanov ANDROID_DLEXT_USE_LIBRARY_FD | 69a6c1279098f24a675d0df74ce1946f5d534b425eDmitriy Ivanov ANDROID_DLEXT_USE_LIBRARY_FD_OFFSET, 70012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles)}; 71012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles) 72012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles)typedef struct { 733a8646fc5d9f1a9304251a1d1c8ff9e523d81b40Dmitriy Ivanov uint64_t flags; 7412bbb9164578b6512b8b07a3fb093858244b7c7bTorne (Richard Coles) void* reserved_addr; 7512bbb9164578b6512b8b07a3fb093858244b7c7bTorne (Richard Coles) size_t reserved_size; 76183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) int relro_fd; 7704dc91ae763adc403a14c88b4c46f77b3d2d71a3Dmitriy Ivanov int library_fd; 78a6c1279098f24a675d0df74ce1946f5d534b425eDmitriy Ivanov off64_t library_fd_offset; 79012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles)} android_dlextinfo; 80012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles) 81012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles)extern void* android_dlopen_ext(const char* filename, int flag, const android_dlextinfo* extinfo); 82012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles) 83012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles)__END_DECLS 84012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles) 85012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles)#endif /* __ANDROID_DLEXT_H__ */ 86