2 * Copyright (C) 2012 The Android Open Source Project
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31 /* Declarations related to the ELF program header table and segments.
33 * The design goal is to provide an API that is as close as possible
34 * to the ELF spec, and does not depend on linker-specific data
35 * structures (e.g. the exact layout of struct soinfo).
39 #include "linker_mapped_file_fragment.h"
45 bool Read(const char* name, int fd, off64_t file_offset, off64_t file_size);
46 bool Load(const android_dlextinfo* extinfo);
48 const char* name() const { return name_.c_str(); }
49 size_t phdr_count() const { return phdr_num_; }
50 ElfW(Addr) load_start() const { return reinterpret_cast<ElfW(Addr)>(load_start_); }
51 size_t load_size() const { return load_size_; }
52 ElfW(Addr) load_bias() const { return load_bias_; }
53 const ElfW(Phdr)* loaded_phdr() const { return loaded_phdr_; }
54 const ElfW(Dyn)* dynamic() const { return dynamic_; }
55 const char* get_string(ElfW(Word) index) const;
56 bool is_mapped_by_caller() const { return mapped_by_caller_; }
60 bool VerifyElfHeader();
61 bool ReadProgramHeaders();
62 bool ReadSectionHeaders();
63 bool ReadDynamicSection();
64 bool ReserveAddressSpace(const android_dlextinfo* extinfo);
67 bool CheckPhdr(ElfW(Addr));
68 bool CheckFileRange(ElfW(Addr) offset, size_t size, size_t alignment);
80 MappedFileFragment phdr_fragment_;
81 const ElfW(Phdr)* phdr_table_;
83 MappedFileFragment shdr_fragment_;
84 const ElfW(Shdr)* shdr_table_;
87 MappedFileFragment dynamic_fragment_;
88 const ElfW(Dyn)* dynamic_;
90 MappedFileFragment strtab_fragment_;
94 // First page of reserved address space.
96 // Size in bytes of reserved address space.
99 ElfW(Addr) load_bias_;
102 const ElfW(Phdr)* loaded_phdr_;
104 // Is map owned by the caller
105 bool mapped_by_caller_;
108 size_t phdr_table_get_load_size(const ElfW(Phdr)* phdr_table, size_t phdr_count,
109 ElfW(Addr)* min_vaddr = nullptr, ElfW(Addr)* max_vaddr = nullptr);
111 int phdr_table_protect_segments(const ElfW(Phdr)* phdr_table,
112 size_t phdr_count, ElfW(Addr) load_bias);
114 int phdr_table_unprotect_segments(const ElfW(Phdr)* phdr_table, size_t phdr_count,
115 ElfW(Addr) load_bias);
117 int phdr_table_protect_gnu_relro(const ElfW(Phdr)* phdr_table, size_t phdr_count,
118 ElfW(Addr) load_bias);
120 int phdr_table_serialize_gnu_relro(const ElfW(Phdr)* phdr_table, size_t phdr_count,
121 ElfW(Addr) load_bias, int fd);
123 int phdr_table_map_gnu_relro(const ElfW(Phdr)* phdr_table, size_t phdr_count,
124 ElfW(Addr) load_bias, int fd);
127 int phdr_table_get_arm_exidx(const ElfW(Phdr)* phdr_table, size_t phdr_count, ElfW(Addr) load_bias,
128 ElfW(Addr)** arm_exidx, size_t* arm_exidix_count);
131 void phdr_table_get_dynamic_section(const ElfW(Phdr)* phdr_table, size_t phdr_count,
132 ElfW(Addr) load_bias, ElfW(Dyn)** dynamic,
133 ElfW(Word)* dynamic_flags);
135 const char* phdr_table_get_interpreter_name(const ElfW(Phdr) * phdr_table, size_t phdr_count,
136 ElfW(Addr) load_bias);
138 #endif /* LINKER_PHDR_H */