e7dffe150b
(cherry picked from commit 88ff15c2c279d2bbe3569101b36cd2aa0931a0a9) Change-Id: I4aabbe911d30aea8ace69e29bb6e980a4e89de90
123 lines
4.1 KiB
C++
123 lines
4.1 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();
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size_t phdr_count() { return phdr_num_; }
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Elf32_Addr load_start() { return reinterpret_cast<Elf32_Addr>(load_start_); }
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Elf32_Addr load_size() { return load_size_; }
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Elf32_Addr load_bias() { return load_bias_; }
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const Elf32_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();
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bool LoadSegments();
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bool FindPhdr();
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bool CheckPhdr(Elf32_Addr);
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const char* name_;
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int fd_;
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Elf32_Ehdr header_;
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size_t phdr_num_;
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void* phdr_mmap_;
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Elf32_Phdr* phdr_table_;
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Elf32_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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Elf32_Addr load_size_;
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// Load bias.
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Elf32_Addr load_bias_;
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// Loaded phdr.
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const Elf32_Phdr* loaded_phdr_;
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};
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size_t
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phdr_table_get_load_size(const Elf32_Phdr* phdr_table,
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size_t phdr_count,
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Elf32_Addr* min_vaddr = NULL,
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Elf32_Addr* max_vaddr = NULL);
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int
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phdr_table_protect_segments(const Elf32_Phdr* phdr_table,
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int phdr_count,
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Elf32_Addr load_bias);
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int
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phdr_table_unprotect_segments(const Elf32_Phdr* phdr_table,
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int phdr_count,
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Elf32_Addr load_bias);
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int
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phdr_table_protect_gnu_relro(const Elf32_Phdr* phdr_table,
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int phdr_count,
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Elf32_Addr load_bias);
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#ifdef ANDROID_ARM_LINKER
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int
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phdr_table_get_arm_exidx(const Elf32_Phdr* phdr_table,
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int phdr_count,
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Elf32_Addr load_bias,
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Elf32_Addr** arm_exidx,
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unsigned* arm_exidix_count);
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#endif
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void
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phdr_table_get_dynamic_section(const Elf32_Phdr* phdr_table,
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int phdr_count,
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Elf32_Addr load_bias,
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Elf32_Dyn** dynamic,
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size_t* dynamic_count,
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Elf32_Word* dynamic_flags);
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#endif /* LINKER_PHDR_H */
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