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/*
* Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
#include "precompiled.hpp"
#if !defined(_WINDOWS) && !defined(__APPLE__)
#include "memory/allocation.inline.hpp"
#include "utilities/elfFuncDescTable.hpp"
#include "utilities/elfSymbolTable.hpp"
ElfSymbolTable::ElfSymbolTable(FILE* file, Elf_Shdr shdr) {
assert(file, "null file handle");
m_symbols = NULL;
m_next = NULL;
m_file = file;
m_status = NullDecoder::no_error;
// try to load the string table
long cur_offset = ftell(file);
if (cur_offset != -1) {
// call malloc so we can back up if memory allocation fails.
m_symbols = (Elf_Sym*)os::malloc(shdr.sh_size, mtInternal);
if (m_symbols) {
if (fseek(file, shdr.sh_offset, SEEK_SET) ||
fread((void*)m_symbols, shdr.sh_size, 1, file) != 1 ||
fseek(file, cur_offset, SEEK_SET)) {
m_status = NullDecoder::file_invalid;
os::free(m_symbols);
m_symbols = NULL;
}
}
if (!NullDecoder::is_error(m_status)) {
memcpy(&m_shdr, &shdr, sizeof(Elf_Shdr));
}
} else {
m_status = NullDecoder::file_invalid;
}
}
ElfSymbolTable::~ElfSymbolTable() {
if (m_symbols != NULL) {
os::free(m_symbols);
}
if (m_next != NULL) {
delete m_next;
}
}
bool ElfSymbolTable::lookup(address addr, int* stringtableIndex, int* posIndex, int* offset, ElfFuncDescTable* funcDescTable) {
assert(stringtableIndex, "null string table index pointer");
assert(posIndex, "null string table offset pointer");
assert(offset, "null offset pointer");
if (NullDecoder::is_error(m_status)) {
return false;
}
size_t sym_size = sizeof(Elf_Sym);
assert((m_shdr.sh_size % sym_size) == 0, "check size");
int count = m_shdr.sh_size / sym_size;
if (m_symbols != NULL) {
for (int index = 0; index < count; index ++) {
if (STT_FUNC == ELF_ST_TYPE(m_symbols[index].st_info)) {
Elf_Word st_size = m_symbols[index].st_size;
address sym_addr;
if (funcDescTable != NULL && funcDescTable->get_index() == m_symbols[index].st_shndx) {
// We need to go another step trough the function descriptor table (currently PPC64 only)
sym_addr = funcDescTable->lookup(m_symbols[index].st_value);
} else {
sym_addr = (address)m_symbols[index].st_value;
}
if (sym_addr <= addr && (Elf_Word)(addr - sym_addr) < st_size) {
*offset = (int)(addr - sym_addr);
*posIndex = m_symbols[index].st_name;
*stringtableIndex = m_shdr.sh_link;
return true;
}
}
}
} else {
long cur_pos;
if ((cur_pos = ftell(m_file)) == -1 ||
fseek(m_file, m_shdr.sh_offset, SEEK_SET)) {
m_status = NullDecoder::file_invalid;
return false;
}
Elf_Sym sym;
for (int index = 0; index < count; index ++) {
if (fread(&sym, sym_size, 1, m_file) == 1) {
if (STT_FUNC == ELF_ST_TYPE(sym.st_info)) {
Elf_Word st_size = sym.st_size;
address sym_addr;
if (funcDescTable != NULL && funcDescTable->get_index() == sym.st_shndx) {
// We need to go another step trough the function descriptor table (currently PPC64 only)
sym_addr = funcDescTable->lookup(sym.st_value);
} else {
sym_addr = (address)sym.st_value;
}
if (sym_addr <= addr && (Elf_Word)(addr - sym_addr) < st_size) {
*offset = (int)(addr - sym_addr);
*posIndex = sym.st_name;
*stringtableIndex = m_shdr.sh_link;
return true;
}
}
} else {
m_status = NullDecoder::file_invalid;
return false;
}
}
fseek(m_file, cur_pos, SEEK_SET);
}
return true;
}
#endif // !_WINDOWS && !__APPLE__
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