12bbb91645
Add flags and parameters to android_dlopen_ext() to allow loading a library at an already-reserved fixed address. If the library to be loaded will not fit within the space reserved, then the linker will either fail, or allocate its own address space as usual, according to which flag has been specified. This behaviour only applies to the specific library requested; any other libraries loaded as dependencies will be loaded in the normal fashion. There is a new gtest included to cover the functionality added. Bug: 13005501 Change-Id: I5d1810375b20fc51ba6a9b3191a25f9792c687f1
103 lines
3.6 KiB
C++
103 lines
3.6 KiB
C++
/*
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* Copyright (C) 2012 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef LINKER_PHDR_H
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#define LINKER_PHDR_H
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/* Declarations related to the ELF program header table and segments.
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*
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* The design goal is to provide an API that is as close as possible
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* to the ELF spec, and does not depend on linker-specific data
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* structures (e.g. the exact layout of struct soinfo).
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*/
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#include "linker.h"
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class ElfReader {
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public:
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ElfReader(const char* name, int fd);
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~ElfReader();
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bool Load(const android_dlextinfo* extinfo);
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size_t phdr_count() { return phdr_num_; }
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ElfW(Addr) load_start() { return reinterpret_cast<ElfW(Addr)>(load_start_); }
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size_t load_size() { return load_size_; }
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ElfW(Addr) load_bias() { return load_bias_; }
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const ElfW(Phdr)* loaded_phdr() { return loaded_phdr_; }
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private:
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bool ReadElfHeader();
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bool VerifyElfHeader();
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bool ReadProgramHeader();
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bool ReserveAddressSpace(const android_dlextinfo* extinfo);
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bool LoadSegments();
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bool FindPhdr();
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bool CheckPhdr(ElfW(Addr));
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const char* name_;
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int fd_;
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ElfW(Ehdr) header_;
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size_t phdr_num_;
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void* phdr_mmap_;
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ElfW(Phdr)* phdr_table_;
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ElfW(Addr) phdr_size_;
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// First page of reserved address space.
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void* load_start_;
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// Size in bytes of reserved address space.
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size_t load_size_;
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// Load bias.
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ElfW(Addr) load_bias_;
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// Loaded phdr.
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const ElfW(Phdr)* loaded_phdr_;
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};
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size_t phdr_table_get_load_size(const ElfW(Phdr)* phdr_table, size_t phdr_count,
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ElfW(Addr)* min_vaddr = NULL, ElfW(Addr)* max_vaddr = NULL);
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int phdr_table_protect_segments(const ElfW(Phdr)* phdr_table, size_t phdr_count, ElfW(Addr) load_bias);
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int phdr_table_unprotect_segments(const ElfW(Phdr)* phdr_table, size_t phdr_count, ElfW(Addr) load_bias);
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int phdr_table_protect_gnu_relro(const ElfW(Phdr)* phdr_table, size_t phdr_count, ElfW(Addr) load_bias);
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#if defined(__arm__)
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int phdr_table_get_arm_exidx(const ElfW(Phdr)* phdr_table, size_t phdr_count, ElfW(Addr) load_bias,
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ElfW(Addr)** arm_exidx, unsigned* arm_exidix_count);
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#endif
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void phdr_table_get_dynamic_section(const ElfW(Phdr)* phdr_table, size_t phdr_count,
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ElfW(Addr) load_bias,
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ElfW(Dyn)** dynamic, size_t* dynamic_count, ElfW(Word)* dynamic_flags);
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#endif /* LINKER_PHDR_H */
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