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89 lines
3.0 KiB
C++
89 lines
3.0 KiB
C++
/*
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* Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#include "jvm.h"
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#include "utilities/decoder_elf.hpp"
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#include "utilities/elfFile.hpp"
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#include <cxxabi.h>
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bool ElfDecoder::demangle(const char* symbol, char *buf, int buflen) {
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int status;
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char* result;
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size_t size = (size_t)buflen;
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#ifdef PPC64
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// On PPC64 ElfDecoder::decode() may return a dot (.) prefixed name
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// (see elfFuncDescTable.hpp for details)
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if (symbol && *symbol == '.') symbol += 1;
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#endif
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// Don't pass buf to __cxa_demangle. In case of the 'buf' is too small,
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// __cxa_demangle will call system "realloc" for additional memory, which
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// may use different malloc/realloc mechanism that allocates 'buf'.
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if ((result = abi::__cxa_demangle(symbol, NULL, NULL, &status)) != NULL) {
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jio_snprintf(buf, buflen, "%s", result);
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// call c library's free
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::free(result);
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return true;
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}
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return false;
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}
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// Returns true if the elf file is marked NOT to require an executable stack,
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// or if the file could not be opened.
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// Returns false if the elf file requires an executable stack, the stack flag
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// is not set at all, or if the file can not be read.
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bool ElfFile::specifies_noexecstack(const char* filepath) {
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if (filepath == NULL) return true;
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FILE* file = fopen(filepath, "r");
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if (file == NULL) return true;
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// AARCH64 defaults to noexecstack. All others default to execstack.
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bool result = AARCH64_ONLY(true) NOT_AARCH64(false);
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// Read file header
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Elf_Ehdr head;
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if (fread(&head, sizeof(Elf_Ehdr), 1, file) == 1 &&
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is_elf_file(head) &&
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fseek(file, head.e_phoff, SEEK_SET) == 0) {
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// Read program header table
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Elf_Phdr phdr;
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for (int index = 0; index < head.e_phnum; index ++) {
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if (fread((void*)&phdr, sizeof(Elf_Phdr), 1, file) != 1) {
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result = false;
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break;
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}
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if (phdr.p_type == PT_GNU_STACK) {
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result = (phdr.p_flags == (PF_R | PF_W));
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break;
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}
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}
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}
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fclose(file);
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return result;
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}
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