1c1bd559d5b0fdcc25db2b6ae2705914103b24699David 'Digit' Turner/* 2c1bd559d5b0fdcc25db2b6ae2705914103b24699David 'Digit' Turner * Copyright (C) 2012 The Android Open Source Project 3c1bd559d5b0fdcc25db2b6ae2705914103b24699David 'Digit' Turner * All rights reserved. 4c1bd559d5b0fdcc25db2b6ae2705914103b24699David 'Digit' Turner * 5c1bd559d5b0fdcc25db2b6ae2705914103b24699David 'Digit' Turner * Redistribution and use in source and binary forms, with or without 6c1bd559d5b0fdcc25db2b6ae2705914103b24699David 'Digit' Turner * modification, are permitted provided that the following conditions 7c1bd559d5b0fdcc25db2b6ae2705914103b24699David 'Digit' Turner * are met: 8c1bd559d5b0fdcc25db2b6ae2705914103b24699David 'Digit' Turner * * Redistributions of source code must retain the above copyright 9c1bd559d5b0fdcc25db2b6ae2705914103b24699David 'Digit' Turner * notice, this list of conditions and the following disclaimer. 10c1bd559d5b0fdcc25db2b6ae2705914103b24699David 'Digit' Turner * * Redistributions in binary form must reproduce the above copyright 11c1bd559d5b0fdcc25db2b6ae2705914103b24699David 'Digit' Turner * notice, this list of conditions and the following disclaimer in 12c1bd559d5b0fdcc25db2b6ae2705914103b24699David 'Digit' Turner * the documentation and/or other materials provided with the 13c1bd559d5b0fdcc25db2b6ae2705914103b24699David 'Digit' Turner * distribution. 14c1bd559d5b0fdcc25db2b6ae2705914103b24699David 'Digit' Turner * 15c1bd559d5b0fdcc25db2b6ae2705914103b24699David 'Digit' Turner * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 16c1bd559d5b0fdcc25db2b6ae2705914103b24699David 'Digit' Turner * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 17c1bd559d5b0fdcc25db2b6ae2705914103b24699David 'Digit' Turner * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 18c1bd559d5b0fdcc25db2b6ae2705914103b24699David 'Digit' Turner * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 19c1bd559d5b0fdcc25db2b6ae2705914103b24699David 'Digit' Turner * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 20c1bd559d5b0fdcc25db2b6ae2705914103b24699David 'Digit' Turner * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21c1bd559d5b0fdcc25db2b6ae2705914103b24699David 'Digit' Turner * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 22c1bd559d5b0fdcc25db2b6ae2705914103b24699David 'Digit' Turner * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23c1bd559d5b0fdcc25db2b6ae2705914103b24699David 'Digit' Turner * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24c1bd559d5b0fdcc25db2b6ae2705914103b24699David 'Digit' Turner * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 25c1bd559d5b0fdcc25db2b6ae2705914103b24699David 'Digit' Turner * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26c1bd559d5b0fdcc25db2b6ae2705914103b24699David 'Digit' Turner * SUCH DAMAGE. 27c1bd559d5b0fdcc25db2b6ae2705914103b24699David 'Digit' Turner */ 28c1bd559d5b0fdcc25db2b6ae2705914103b24699David 'Digit' Turner#ifndef LINKER_PHDR_H 29c1bd559d5b0fdcc25db2b6ae2705914103b24699David 'Digit' Turner#define LINKER_PHDR_H 30c1bd559d5b0fdcc25db2b6ae2705914103b24699David 'Digit' Turner 31c1bd559d5b0fdcc25db2b6ae2705914103b24699David 'Digit' Turner/* Declarations related to the ELF program header table and segments. 32c1bd559d5b0fdcc25db2b6ae2705914103b24699David 'Digit' Turner * 33c1bd559d5b0fdcc25db2b6ae2705914103b24699David 'Digit' Turner * The design goal is to provide an API that is as close as possible 34c1bd559d5b0fdcc25db2b6ae2705914103b24699David 'Digit' Turner * to the ELF spec, and does not depend on linker-specific data 35c1bd559d5b0fdcc25db2b6ae2705914103b24699David 'Digit' Turner * structures (e.g. the exact layout of struct soinfo). 36c1bd559d5b0fdcc25db2b6ae2705914103b24699David 'Digit' Turner */ 37c1bd559d5b0fdcc25db2b6ae2705914103b24699David 'Digit' Turner 38c1bd559d5b0fdcc25db2b6ae2705914103b24699David 'Digit' Turner#include "linker.h" 39c1bd559d5b0fdcc25db2b6ae2705914103b24699David 'Digit' Turner 40650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughesclass ElfReader { 41650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes public: 42650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes ElfReader(const char* name, int fd); 43650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes ~ElfReader(); 44c1bd559d5b0fdcc25db2b6ae2705914103b24699David 'Digit' Turner 4512bbb9164578b6512b8b07a3fb093858244b7c7bTorne (Richard Coles) bool Load(const android_dlextinfo* extinfo); 46c1bd559d5b0fdcc25db2b6ae2705914103b24699David 'Digit' Turner 47650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes size_t phdr_count() { return phdr_num_; } 480266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr) load_start() { return reinterpret_cast<ElfW(Addr)>(load_start_); } 49c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes size_t load_size() { return load_size_; } 500266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr) load_bias() { return load_bias_; } 510266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes const ElfW(Phdr)* loaded_phdr() { return loaded_phdr_; } 52c1bd559d5b0fdcc25db2b6ae2705914103b24699David 'Digit' Turner 53650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes private: 54650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes bool ReadElfHeader(); 55650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes bool VerifyElfHeader(); 56650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes bool ReadProgramHeader(); 5712bbb9164578b6512b8b07a3fb093858244b7c7bTorne (Richard Coles) bool ReserveAddressSpace(const android_dlextinfo* extinfo); 58650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes bool LoadSegments(); 59650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes bool FindPhdr(); 600266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes bool CheckPhdr(ElfW(Addr)); 61c1bd559d5b0fdcc25db2b6ae2705914103b24699David 'Digit' Turner 62650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes const char* name_; 63650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes int fd_; 64650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes 650266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Ehdr) header_; 66650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes size_t phdr_num_; 67650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes 68650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes void* phdr_mmap_; 690266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Phdr)* phdr_table_; 700266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr) phdr_size_; 71650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes 72650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes // First page of reserved address space. 73650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes void* load_start_; 74650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes // Size in bytes of reserved address space. 75c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes size_t load_size_; 76650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes // Load bias. 770266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr) load_bias_; 78650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes 79650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes // Loaded phdr. 800266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes const ElfW(Phdr)* loaded_phdr_; 81650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes}; 82650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes 830266ae5f884d72da58f33a072e865ba131234a5eElliott Hughessize_t phdr_table_get_load_size(const ElfW(Phdr)* phdr_table, size_t phdr_count, 840266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr)* min_vaddr = NULL, ElfW(Addr)* max_vaddr = NULL); 85c1bd559d5b0fdcc25db2b6ae2705914103b24699David 'Digit' Turner 860266ae5f884d72da58f33a072e865ba131234a5eElliott Hughesint phdr_table_protect_segments(const ElfW(Phdr)* phdr_table, size_t phdr_count, ElfW(Addr) load_bias); 87c1bd559d5b0fdcc25db2b6ae2705914103b24699David 'Digit' Turner 880266ae5f884d72da58f33a072e865ba131234a5eElliott Hughesint phdr_table_unprotect_segments(const ElfW(Phdr)* phdr_table, size_t phdr_count, ElfW(Addr) load_bias); 89c1bd559d5b0fdcc25db2b6ae2705914103b24699David 'Digit' Turner 900266ae5f884d72da58f33a072e865ba131234a5eElliott Hughesint phdr_table_protect_gnu_relro(const ElfW(Phdr)* phdr_table, size_t phdr_count, ElfW(Addr) load_bias); 91c1bd559d5b0fdcc25db2b6ae2705914103b24699David 'Digit' Turner 92183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles)int phdr_table_serialize_gnu_relro(const ElfW(Phdr)* phdr_table, size_t phdr_count, ElfW(Addr) load_bias, 93183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) int fd); 94183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) 95183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles)int phdr_table_map_gnu_relro(const ElfW(Phdr)* phdr_table, size_t phdr_count, ElfW(Addr) load_bias, 96183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) int fd); 97c1bd559d5b0fdcc25db2b6ae2705914103b24699David 'Digit' Turner 984eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__arm__) 990266ae5f884d72da58f33a072e865ba131234a5eElliott Hughesint phdr_table_get_arm_exidx(const ElfW(Phdr)* phdr_table, size_t phdr_count, ElfW(Addr) load_bias, 1000266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr)** arm_exidx, unsigned* arm_exidix_count); 101c1bd559d5b0fdcc25db2b6ae2705914103b24699David 'Digit' Turner#endif 102c1bd559d5b0fdcc25db2b6ae2705914103b24699David 'Digit' Turner 1030266ae5f884d72da58f33a072e865ba131234a5eElliott Hughesvoid phdr_table_get_dynamic_section(const ElfW(Phdr)* phdr_table, size_t phdr_count, 1040266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr) load_bias, 1050266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Dyn)** dynamic, size_t* dynamic_count, ElfW(Word)* dynamic_flags); 106c1bd559d5b0fdcc25db2b6ae2705914103b24699David 'Digit' Turner 107c1bd559d5b0fdcc25db2b6ae2705914103b24699David 'Digit' Turner#endif /* LINKER_PHDR_H */ 108