Mercurial > jdk8-mips64-public > hotspot / annotate
src/share/vm/utilities/elfFuncDescTable.cpp@a9becfeecd1b (annotated)
src/share/vm/utilities/elfFuncDescTable.cpp
Wed, 22 Jan 2014 17:42:23 -0800
- author
- kvn
- date
- Wed, 22 Jan 2014 17:42:23 -0800
- changeset 6503
- a9becfeecd1b
- parent 0
- f90c822e73f8
- permissions
- -rw-r--r--
Merge
| aoqi@0 | 1 | /* |
| aoqi@0 | 2 | * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. |
| aoqi@0 | 3 | * Copyright 2012, 2013 SAP AG. All rights reserved. |
| aoqi@0 | 4 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| aoqi@0 | 5 | * |
| aoqi@0 | 6 | * This code is free software; you can redistribute it and/or modify it |
| aoqi@0 | 7 | * under the terms of the GNU General Public License version 2 only, as |
| aoqi@0 | 8 | * published by the Free Software Foundation. |
| aoqi@0 | 9 | * |
| aoqi@0 | 10 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| aoqi@0 | 11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| aoqi@0 | 12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| aoqi@0 | 13 | * version 2 for more details (a copy is included in the LICENSE file that |
| aoqi@0 | 14 | * accompanied this code). |
| aoqi@0 | 15 | * |
| aoqi@0 | 16 | * You should have received a copy of the GNU General Public License version |
| aoqi@0 | 17 | * 2 along with this work; if not, write to the Free Software Foundation, |
| aoqi@0 | 18 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| aoqi@0 | 19 | * |
| aoqi@0 | 20 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| aoqi@0 | 21 | * or visit www.oracle.com if you need additional information or have any |
| aoqi@0 | 22 | * questions. |
| aoqi@0 | 23 | * |
| aoqi@0 | 24 | */ |
| aoqi@0 | 25 | |
| aoqi@0 | 26 | #include "precompiled.hpp" |
| aoqi@0 | 27 | |
| aoqi@0 | 28 | #if !defined(_WINDOWS) && !defined(__APPLE__) |
| aoqi@0 | 29 | |
| aoqi@0 | 30 | #include "memory/allocation.inline.hpp" |
| aoqi@0 | 31 | #include "utilities/elfFuncDescTable.hpp" |
| aoqi@0 | 32 | |
| aoqi@0 | 33 | ElfFuncDescTable::ElfFuncDescTable(FILE* file, Elf_Shdr shdr, int index) { |
| aoqi@0 | 34 | assert(file, "null file handle"); |
| aoqi@0 | 35 | // The actual function address (i.e. function entry point) is always the |
| aoqi@0 | 36 | // first value in the function descriptor (on IA64 and PPC64 they look as follows): |
| aoqi@0 | 37 | // PPC64: [function entry point, TOC pointer, environment pointer] |
| aoqi@0 | 38 | // IA64 : [function entry point, GP (global pointer) value] |
| aoqi@0 | 39 | // Unfortunately 'shdr.sh_entsize' doesn't always seem to contain this size (it's zero on PPC64) so we can't assert |
| aoqi@0 | 40 | // assert(IA64_ONLY(2) PPC64_ONLY(3) * sizeof(address) == shdr.sh_entsize, "Size mismatch for '.opd' section entries"); |
| aoqi@0 | 41 | |
| aoqi@0 | 42 | m_funcDescs = NULL; |
| aoqi@0 | 43 | m_file = file; |
| aoqi@0 | 44 | m_index = index; |
| aoqi@0 | 45 | m_status = NullDecoder::no_error; |
| aoqi@0 | 46 | |
| aoqi@0 | 47 | // try to load the function descriptor table |
| aoqi@0 | 48 | long cur_offset = ftell(file); |
| aoqi@0 | 49 | if (cur_offset != -1) { |
| aoqi@0 | 50 | // call malloc so we can back up if memory allocation fails. |
| aoqi@0 | 51 | m_funcDescs = (address*)os::malloc(shdr.sh_size, mtInternal); |
| aoqi@0 | 52 | if (m_funcDescs) { |
| aoqi@0 | 53 | if (fseek(file, shdr.sh_offset, SEEK_SET) || |
| aoqi@0 | 54 | fread((void*)m_funcDescs, shdr.sh_size, 1, file) != 1 || |
| aoqi@0 | 55 | fseek(file, cur_offset, SEEK_SET)) { |
| aoqi@0 | 56 | m_status = NullDecoder::file_invalid; |
| aoqi@0 | 57 | os::free(m_funcDescs); |
| aoqi@0 | 58 | m_funcDescs = NULL; |
| aoqi@0 | 59 | } |
| aoqi@0 | 60 | } |
| aoqi@0 | 61 | if (!NullDecoder::is_error(m_status)) { |
| aoqi@0 | 62 | memcpy(&m_shdr, &shdr, sizeof(Elf_Shdr)); |
| aoqi@0 | 63 | } |
| aoqi@0 | 64 | } else { |
| aoqi@0 | 65 | m_status = NullDecoder::file_invalid; |
| aoqi@0 | 66 | } |
| aoqi@0 | 67 | } |
| aoqi@0 | 68 | |
| aoqi@0 | 69 | ElfFuncDescTable::~ElfFuncDescTable() { |
| aoqi@0 | 70 | if (m_funcDescs != NULL) { |
| aoqi@0 | 71 | os::free(m_funcDescs); |
| aoqi@0 | 72 | } |
| aoqi@0 | 73 | } |
| aoqi@0 | 74 | |
| aoqi@0 | 75 | address ElfFuncDescTable::lookup(Elf_Word index) { |
| aoqi@0 | 76 | if (NullDecoder::is_error(m_status)) { |
| aoqi@0 | 77 | return NULL; |
| aoqi@0 | 78 | } |
| aoqi@0 | 79 | |
| aoqi@0 | 80 | if (m_funcDescs != NULL) { |
| aoqi@0 | 81 | if (m_shdr.sh_size > 0 && m_shdr.sh_addr <= index && index <= m_shdr.sh_addr + m_shdr.sh_size) { |
| aoqi@0 | 82 | // Notice that 'index' is a byte-offset into the function descriptor table. |
| aoqi@0 | 83 | return m_funcDescs[(index - m_shdr.sh_addr) / sizeof(address)]; |
| aoqi@0 | 84 | } |
| aoqi@0 | 85 | return NULL; |
| aoqi@0 | 86 | } else { |
| aoqi@0 | 87 | long cur_pos; |
| aoqi@0 | 88 | address addr; |
| aoqi@0 | 89 | if (!(m_shdr.sh_size > 0 && m_shdr.sh_addr <= index && index <= m_shdr.sh_addr + m_shdr.sh_size)) { |
| aoqi@0 | 90 | // don't put the whole decoder in error mode if we just tried a wrong index |
| aoqi@0 | 91 | return NULL; |
| aoqi@0 | 92 | } |
| aoqi@0 | 93 | if ((cur_pos = ftell(m_file)) == -1 || |
| aoqi@0 | 94 | fseek(m_file, m_shdr.sh_offset + index - m_shdr.sh_addr, SEEK_SET) || |
| aoqi@0 | 95 | fread(&addr, sizeof(addr), 1, m_file) != 1 || |
| aoqi@0 | 96 | fseek(m_file, cur_pos, SEEK_SET)) { |
| aoqi@0 | 97 | m_status = NullDecoder::file_invalid; |
| aoqi@0 | 98 | return NULL; |
| aoqi@0 | 99 | } |
| aoqi@0 | 100 | return addr; |
| aoqi@0 | 101 | } |
| aoqi@0 | 102 | } |
| aoqi@0 | 103 | |
| aoqi@0 | 104 | #endif // !_WINDOWS && !__APPLE__ |
