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83 lines
2.2 KiB
C++
83 lines
2.2 KiB
C++
/* -*- Mode: C++ -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef elf_symbol_table_h__
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#define elf_symbol_table_h__
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/*
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Utility class for reading ELF symbol tables.
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*/
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#include <elf.h>
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#include <sys/mman.h>
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#include "interval_map.h"
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class elf_symbol_table {
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protected:
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int m_fd;
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void *m_mapping;
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size_t m_size;
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const char *m_strtab;
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const Elf32_Sym *m_symbols;
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int m_nsymbols;
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int m_text_shndx;
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typedef interval_map<unsigned int, const Elf32_Sym *> rsymtab_t;
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rsymtab_t m_rsymtab;
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int verify_elf_header(const Elf32_Ehdr *hdr);
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int finish();
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public:
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elf_symbol_table()
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: m_fd(-1),
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m_mapping(MAP_FAILED),
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m_size(0),
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m_strtab(0),
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m_symbols(0),
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m_nsymbols(0),
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m_text_shndx(0) {}
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~elf_symbol_table() { finish(); }
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/**
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* Read the symbol table information from the specified file. (This will
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* memory-map the file.)
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*
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* Currently, only symbols from the `.text' section are loaded.
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*/
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int init(const char *file);
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/**
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* Determine what symbol the specified image address corresponds
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* to. Addresses need not refer to a symbol's start address:
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* symbol size information is used to reverse-map the address.
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*/
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const Elf32_Sym *lookup(unsigned int addr) const;
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/**
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* Determine the symbol name for the specified symbol.
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*/
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const char *get_symbol_name(const Elf32_Sym *sym) const;
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/**
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* Return `true' if the specified symbol is a function.
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*/
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bool is_function(const Elf32_Sym *sym) const {
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return (sym->st_size > 0) &&
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(ELF32_ST_TYPE(sym->st_info) == STT_FUNC) &&
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(sym->st_shndx == m_text_shndx); }
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typedef const Elf32_Sym *const_iterator;
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const_iterator begin() const { return const_iterator(m_symbols); }
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const_iterator end() const { return const_iterator(m_symbols + m_nsymbols); }
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};
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#endif // elf_symbol_table_h__
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