17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26
27 #if !defined(_WINDOWS) && !defined(__APPLE__)
28
29 #include <string.h>
30 #include <stdio.h>
31 #include <limits.h>
32 #include <new>
33
34 #include "memory/allocation.inline.hpp"
35 #include "utilities/decoder.hpp"
36 #include "utilities/elfFile.hpp"
37 #include "utilities/elfStringTable.hpp"
38 #include "utilities/elfSymbolTable.hpp"
39
40
41 ElfFile::ElfFile(const char* filepath) {
42 assert(filepath, "null file path");
43 memset(&m_elfHdr, 0, sizeof(m_elfHdr));
44 m_string_tables = NULL;
45 m_symbol_tables = NULL;
46 m_next = NULL;
47 m_status = NullDecoder::no_error;
48
49 int len = strlen(filepath) + 1;
50 m_filepath = (const char*)os::malloc(len * sizeof(char), mtInternal);
51 if (m_filepath != NULL) {
52 strcpy((char*)m_filepath, filepath);
53 m_file = fopen(filepath, "r");
54 if (m_file != NULL) {
55 load_tables();
56 } else {
57 m_status = NullDecoder::file_not_found;
58 }
59 } else {
60 m_status = NullDecoder::out_of_memory;
61 }
62 }
63
64 ElfFile::~ElfFile() {
65 if (m_string_tables != NULL) {
102 if (fread(&m_elfHdr, sizeof(m_elfHdr), 1, m_file) != 1) {
103 m_status = NullDecoder::file_invalid;
104 return false;
105 }
106
107 if (!is_elf_file(m_elfHdr)) {
108 m_status = NullDecoder::file_invalid;
109 return false;
110 }
111
112 // walk elf file's section headers, and load string tables
113 Elf_Shdr shdr;
114 if (!fseek(m_file, m_elfHdr.e_shoff, SEEK_SET)) {
115 if (NullDecoder::is_error(m_status)) return false;
116
117 for (int index = 0; index < m_elfHdr.e_shnum; index ++) {
118 if (fread((void*)&shdr, sizeof(Elf_Shdr), 1, m_file) != 1) {
119 m_status = NullDecoder::file_invalid;
120 return false;
121 }
122 // string table
123 if (shdr.sh_type == SHT_STRTAB) {
124 ElfStringTable* table = new (std::nothrow) ElfStringTable(m_file, shdr, index);
125 if (table == NULL) {
126 m_status = NullDecoder::out_of_memory;
127 return false;
128 }
129 add_string_table(table);
130 } else if (shdr.sh_type == SHT_SYMTAB || shdr.sh_type == SHT_DYNSYM) {
131 ElfSymbolTable* table = new (std::nothrow) ElfSymbolTable(m_file, shdr);
132 if (table == NULL) {
133 m_status = NullDecoder::out_of_memory;
134 return false;
135 }
136 add_symbol_table(table);
137 }
138 }
139 }
140 return true;
141 }
142
143 bool ElfFile::decode(address addr, char* buf, int buflen, int* offset) {
144 // something already went wrong, just give up
145 if (NullDecoder::is_error(m_status)) {
146 return false;
147 }
148 ElfSymbolTable* symbol_table = m_symbol_tables;
149 int string_table_index;
150 int pos_in_string_table;
151 int off = INT_MAX;
152 bool found_symbol = false;
153 while (symbol_table != NULL) {
154 if (symbol_table->lookup(addr, &string_table_index, &pos_in_string_table, &off)) {
155 found_symbol = true;
156 }
157 symbol_table = symbol_table->m_next;
158 }
159 if (!found_symbol) return false;
160
161 ElfStringTable* string_table = get_string_table(string_table_index);
162
163 if (string_table == NULL) {
164 m_status = NullDecoder::file_invalid;
165 return false;
166 }
167 if (offset) *offset = off;
168
169 return string_table->string_at(pos_in_string_table, buf, buflen);
170 }
171
172
173 void ElfFile::add_symbol_table(ElfSymbolTable* table) {
174 if (m_symbol_tables == NULL) {
175 m_symbol_tables = table;
|
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26
27 #if !defined(_WINDOWS) && !defined(__APPLE__)
28
29 #include <string.h>
30 #include <stdio.h>
31 #include <limits.h>
32 #include <new>
33
34 #include "memory/allocation.inline.hpp"
35 #include "utilities/decoder.hpp"
36 #include "utilities/elfFile.hpp"
37 #include "utilities/elfFuncDescTable.hpp"
38 #include "utilities/elfStringTable.hpp"
39 #include "utilities/elfSymbolTable.hpp"
40
41
42 ElfFile::ElfFile(const char* filepath) {
43 assert(filepath, "null file path");
44 memset(&m_elfHdr, 0, sizeof(m_elfHdr));
45 m_string_tables = NULL;
46 m_symbol_tables = NULL;
47 m_funcDesc_table = NULL;
48 m_next = NULL;
49 m_status = NullDecoder::no_error;
50
51 int len = strlen(filepath) + 1;
52 m_filepath = (const char*)os::malloc(len * sizeof(char), mtInternal);
53 if (m_filepath != NULL) {
54 strcpy((char*)m_filepath, filepath);
55 m_file = fopen(filepath, "r");
56 if (m_file != NULL) {
57 load_tables();
58 } else {
59 m_status = NullDecoder::file_not_found;
60 }
61 } else {
62 m_status = NullDecoder::out_of_memory;
63 }
64 }
65
66 ElfFile::~ElfFile() {
67 if (m_string_tables != NULL) {
104 if (fread(&m_elfHdr, sizeof(m_elfHdr), 1, m_file) != 1) {
105 m_status = NullDecoder::file_invalid;
106 return false;
107 }
108
109 if (!is_elf_file(m_elfHdr)) {
110 m_status = NullDecoder::file_invalid;
111 return false;
112 }
113
114 // walk elf file's section headers, and load string tables
115 Elf_Shdr shdr;
116 if (!fseek(m_file, m_elfHdr.e_shoff, SEEK_SET)) {
117 if (NullDecoder::is_error(m_status)) return false;
118
119 for (int index = 0; index < m_elfHdr.e_shnum; index ++) {
120 if (fread((void*)&shdr, sizeof(Elf_Shdr), 1, m_file) != 1) {
121 m_status = NullDecoder::file_invalid;
122 return false;
123 }
124 // string tables
125 if (shdr.sh_type == SHT_STRTAB) {
126 ElfStringTable* table = new (std::nothrow) ElfStringTable(m_file, shdr, index);
127 if (table == NULL) {
128 m_status = NullDecoder::out_of_memory;
129 return false;
130 }
131 add_string_table(table);
132 }
133 // symbol tables
134 else if (shdr.sh_type == SHT_SYMTAB || shdr.sh_type == SHT_DYNSYM) {
135 ElfSymbolTable* table = new (std::nothrow) ElfSymbolTable(m_file, shdr);
136 if (table == NULL) {
137 m_status = NullDecoder::out_of_memory;
138 return false;
139 }
140 add_symbol_table(table);
141 }
142 }
143
144 #if defined(PPC64)
145 // Now read the .opd section wich contains the PPC64 function descriptor table.
146 // The .opd section is only available on PPC64 (see for example:
147 // http://refspecs.linuxfoundation.org/LSB_3.1.1/LSB-Core-PPC64/LSB-Core-PPC64/specialsections.html)
148 // so this code should do no harm on other platforms but because of performance reasons we only
149 // execute it on PPC64 platforms.
150 // Notice that we can only find the .opd section after we have successfully read in the string
151 // tables in the previous loop, because we need to query the name of each section which is
152 // contained in one of the string tables (i.e. the one with the index m_elfHdr.e_shstrndx).
153
154 // Reset the file pointer
155 if (fseek(m_file, m_elfHdr.e_shoff, SEEK_SET)) {
156 m_status = NullDecoder::file_invalid;
157 return false;
158 }
159 for (int index = 0; index < m_elfHdr.e_shnum; index ++) {
160 if (fread((void*)&shdr, sizeof(Elf_Shdr), 1, m_file) != 1) {
161 m_status = NullDecoder::file_invalid;
162 return false;
163 }
164 if (m_elfHdr.e_shstrndx != SHN_UNDEF && shdr.sh_type == SHT_PROGBITS) {
165 ElfStringTable* string_table = get_string_table(m_elfHdr.e_shstrndx);
166 if (string_table == NULL) {
167 m_status = NullDecoder::file_invalid;
168 return false;
169 }
170 char buf[8]; // '8' is enough because we only want to read ".opd"
171 if (string_table->string_at(shdr.sh_name, buf, sizeof(buf)) && !strncmp(".opd", buf, 4)) {
172 m_funcDesc_table = new (std::nothrow) ElfFuncDescTable(m_file, shdr);
173 break;
174 }
175 }
176 }
177 #endif
178
179 }
180 return true;
181 }
182
183 bool ElfFile::decode(address addr, char* buf, int buflen, int* offset) {
184 // something already went wrong, just give up
185 if (NullDecoder::is_error(m_status)) {
186 return false;
187 }
188 ElfSymbolTable* symbol_table = m_symbol_tables;
189 int string_table_index;
190 int pos_in_string_table;
191 int off = INT_MAX;
192 bool found_symbol = false;
193 while (symbol_table != NULL) {
194 if (symbol_table->lookup(addr, &string_table_index, &pos_in_string_table, &off, m_funcDesc_table)) {
195 found_symbol = true;
196 break;
197 }
198 symbol_table = symbol_table->m_next;
199 }
200 if (!found_symbol) return false;
201
202 ElfStringTable* string_table = get_string_table(string_table_index);
203
204 if (string_table == NULL) {
205 m_status = NullDecoder::file_invalid;
206 return false;
207 }
208 if (offset) *offset = off;
209
210 return string_table->string_at(pos_in_string_table, buf, buflen);
211 }
212
213
214 void ElfFile::add_symbol_table(ElfSymbolTable* table) {
215 if (m_symbol_tables == NULL) {
216 m_symbol_tables = table;
|