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annotate src/share/vm/utilities/elfFuncDescTable.cpp @ 14518:d8041d695d19

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Merged with jdk9/dev/hotspot changeset 3812c088b945
author twisti
date Tue, 11 Mar 2014 18:45:59 -0700
parents e7cbc95179c4
children
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14441
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1 /*
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2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
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3 * Copyright 2012, 2013 SAP AG. All rights reserved.
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4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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5 *
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6 * This code is free software; you can redistribute it and/or modify it
e7cbc95179c4 8019929: PPC64 (part 107): Extend ELF-decoder to support PPC64 function descriptor tables
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7 * under the terms of the GNU General Public License version 2 only, as
e7cbc95179c4 8019929: PPC64 (part 107): Extend ELF-decoder to support PPC64 function descriptor tables
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8 * published by the Free Software Foundation.
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9 *
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10 * This code is distributed in the hope that it will be useful, but WITHOUT
e7cbc95179c4 8019929: PPC64 (part 107): Extend ELF-decoder to support PPC64 function descriptor tables
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11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
e7cbc95179c4 8019929: PPC64 (part 107): Extend ELF-decoder to support PPC64 function descriptor tables
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12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
e7cbc95179c4 8019929: PPC64 (part 107): Extend ELF-decoder to support PPC64 function descriptor tables
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13 * version 2 for more details (a copy is included in the LICENSE file that
e7cbc95179c4 8019929: PPC64 (part 107): Extend ELF-decoder to support PPC64 function descriptor tables
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14 * accompanied this code).
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15 *
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16 * You should have received a copy of the GNU General Public License version
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17 * 2 along with this work; if not, write to the Free Software Foundation,
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18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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19 *
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20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
e7cbc95179c4 8019929: PPC64 (part 107): Extend ELF-decoder to support PPC64 function descriptor tables
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21 * or visit www.oracle.com if you need additional information or have any
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22 * questions.
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23 *
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24 */
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25
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26 #include "precompiled.hpp"
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27
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28 #if !defined(_WINDOWS) && !defined(__APPLE__)
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29
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30 #include "memory/allocation.inline.hpp"
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31 #include "utilities/elfFuncDescTable.hpp"
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32
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33 ElfFuncDescTable::ElfFuncDescTable(FILE* file, Elf_Shdr shdr, int index) {
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34 assert(file, "null file handle");
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35 // The actual function address (i.e. function entry point) is always the
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36 // first value in the function descriptor (on IA64 and PPC64 they look as follows):
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37 // PPC64: [function entry point, TOC pointer, environment pointer]
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38 // IA64 : [function entry point, GP (global pointer) value]
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39 // Unfortunately 'shdr.sh_entsize' doesn't always seem to contain this size (it's zero on PPC64) so we can't assert
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40 // assert(IA64_ONLY(2) PPC64_ONLY(3) * sizeof(address) == shdr.sh_entsize, "Size mismatch for '.opd' section entries");
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41
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42 m_funcDescs = NULL;
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43 m_file = file;
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44 m_index = index;
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45 m_status = NullDecoder::no_error;
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46
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47 // try to load the function descriptor table
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48 long cur_offset = ftell(file);
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49 if (cur_offset != -1) {
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50 // call malloc so we can back up if memory allocation fails.
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51 m_funcDescs = (address*)os::malloc(shdr.sh_size, mtInternal);
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52 if (m_funcDescs) {
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53 if (fseek(file, shdr.sh_offset, SEEK_SET) ||
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54 fread((void*)m_funcDescs, shdr.sh_size, 1, file) != 1 ||
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55 fseek(file, cur_offset, SEEK_SET)) {
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56 m_status = NullDecoder::file_invalid;
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57 os::free(m_funcDescs);
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58 m_funcDescs = NULL;
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59 }
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60 }
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61 if (!NullDecoder::is_error(m_status)) {
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62 memcpy(&m_shdr, &shdr, sizeof(Elf_Shdr));
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63 }
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64 } else {
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65 m_status = NullDecoder::file_invalid;
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66 }
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67 }
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68
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69 ElfFuncDescTable::~ElfFuncDescTable() {
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70 if (m_funcDescs != NULL) {
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71 os::free(m_funcDescs);
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72 }
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73 }
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74
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75 address ElfFuncDescTable::lookup(Elf_Word index) {
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76 if (NullDecoder::is_error(m_status)) {
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77 return NULL;
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78 }
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79
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80 if (m_funcDescs != NULL) {
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81 if (m_shdr.sh_size > 0 && m_shdr.sh_addr <= index && index <= m_shdr.sh_addr + m_shdr.sh_size) {
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82 // Notice that 'index' is a byte-offset into the function descriptor table.
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83 return m_funcDescs[(index - m_shdr.sh_addr) / sizeof(address)];
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84 }
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85 return NULL;
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86 } else {
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87 long cur_pos;
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88 address addr;
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89 if (!(m_shdr.sh_size > 0 && m_shdr.sh_addr <= index && index <= m_shdr.sh_addr + m_shdr.sh_size)) {
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90 // don't put the whole decoder in error mode if we just tried a wrong index
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91 return NULL;
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92 }
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93 if ((cur_pos = ftell(m_file)) == -1 ||
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94 fseek(m_file, m_shdr.sh_offset + index - m_shdr.sh_addr, SEEK_SET) ||
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95 fread(&addr, sizeof(addr), 1, m_file) != 1 ||
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96 fseek(m_file, cur_pos, SEEK_SET)) {
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97 m_status = NullDecoder::file_invalid;
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98 return NULL;
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99 }
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100 return addr;
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101 }
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102 }
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103
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104 #endif // !_WINDOWS && !__APPLE__