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150 lines
4.5 KiB
C++
150 lines
4.5 KiB
C++
/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is ``elf_symbol_table''
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corp. Portions created by the Initial Developer are
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* Copyright (C) 2001 the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Chris Waterson <waterson@netscape.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include <string>
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#include <fstream>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include "elf_symbol_table.h"
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#include "elf_utils.h"
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int
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elf_symbol_table::init(const char *name)
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{
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// Open the file readonly.
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m_fd = open(name, O_RDONLY);
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if (m_fd < 0) {
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perror(name);
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return m_fd;
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}
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// Get its size.
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struct stat statbuf;
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if (fstat(m_fd, &statbuf) < 0) {
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perror(name);
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return -1;
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}
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m_size = statbuf.st_size;
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// Memory map it.
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m_mapping = mmap(0, m_size, PROT_READ, MAP_SHARED, m_fd, 0);
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if (m_mapping == MAP_FAILED) {
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perror(name);
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return -1;
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}
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// Make sure it's an ELF header.
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const Elf32_Ehdr *ehdr = reinterpret_cast<const Elf32_Ehdr *>(m_mapping);
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if (elf_verify_header(ehdr) < 0)
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return -1;
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const char *mapping = reinterpret_cast<const char *>(m_mapping);
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// Find the section headers
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const Elf32_Shdr *shdrs
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= reinterpret_cast<const Elf32_Shdr *>(mapping + ehdr->e_shoff);
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// find the section header string table, .shstrtab
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const Elf32_Shdr *shstrtabsh = shdrs + ehdr->e_shstrndx;
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const char *shstrtab = mapping + shstrtabsh->sh_offset;
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// parse the sections we care about
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int shndx = 0;
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const Elf32_Shdr *shlimit = shdrs + ehdr->e_shnum;
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for (const Elf32_Shdr *shdr = shdrs; shdr < shlimit; ++shdr, ++shndx) {
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basic_string<char> name(shstrtab + shdr->sh_name);
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if (name == ".symtab") {
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m_symbols = reinterpret_cast<const Elf32_Sym *>(mapping + shdr->sh_offset);
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m_nsymbols = shdr->sh_size / sizeof(Elf32_Sym);
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}
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else if (name == ".strtab") {
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m_strtab = mapping + shdr->sh_offset;
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}
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else if (name == ".text") {
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m_text_shndx = shndx;
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}
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}
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// Parse the symbol table
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const Elf32_Sym *limit = m_symbols + m_nsymbols;
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for (const Elf32_Sym *sym = m_symbols; sym < limit; ++sym) {
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if (is_function(sym)) {
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#ifdef DEBUG
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hex(cout);
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cout << sym->st_value << endl;
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#endif
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m_rsymtab.put(sym->st_value, sym->st_value + sym->st_size, sym);
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}
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}
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return 0;
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}
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int
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elf_symbol_table::finish()
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{
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if (m_mapping != MAP_FAILED) {
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munmap(m_mapping, m_size);
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m_mapping = MAP_FAILED;
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}
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if (m_fd >= 0) {
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close(m_fd);
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m_fd = -1;
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}
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return 0;
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}
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const Elf32_Sym *
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elf_symbol_table::lookup(unsigned int addr) const
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{
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rsymtab_t::const_iterator result = m_rsymtab.get(addr);
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return result != m_rsymtab.end() ? reinterpret_cast<const Elf32_Sym *>(*result) : 0;
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}
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const char *
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elf_symbol_table::get_symbol_name(const Elf32_Sym *sym) const
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{
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return m_strtab + sym->st_name;
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}
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