28 #if !defined(_WINDOWS) && !defined(__APPLE__)
29
30 #if defined(__OpenBSD__)
31 #include <sys/exec_elf.h>
32 #else
33 #include <elf.h>
34 #endif
35 #include <stdio.h>
36
37 #ifdef _LP64
38
39 typedef Elf64_Half Elf_Half;
40 typedef Elf64_Word Elf_Word;
41 typedef Elf64_Off Elf_Off;
42 typedef Elf64_Addr Elf_Addr;
43
44 typedef Elf64_Ehdr Elf_Ehdr;
45 typedef Elf64_Shdr Elf_Shdr;
46 typedef Elf64_Phdr Elf_Phdr;
47 typedef Elf64_Sym Elf_Sym;
48
49 #if !defined(_ALLBSD_SOURCE) || defined(__APPLE__)
50 #define ELF_ST_TYPE ELF64_ST_TYPE
51 #endif
52
53 #else
54
55 typedef Elf32_Half Elf_Half;
56 typedef Elf32_Word Elf_Word;
57 typedef Elf32_Off Elf_Off;
58 typedef Elf32_Addr Elf_Addr;
59
60 typedef Elf32_Ehdr Elf_Ehdr;
61 typedef Elf32_Shdr Elf_Shdr;
62 typedef Elf32_Phdr Elf_Phdr;
63 typedef Elf32_Sym Elf_Sym;
64
65 #if !defined(_ALLBSD_SOURCE) || defined(__APPLE__)
66 #define ELF_ST_TYPE ELF32_ST_TYPE
67 #endif
68 #endif
69
70 #include "globalDefinitions.hpp"
71 #include "memory/allocation.hpp"
72 #include "utilities/decoder.hpp"
73
74 class ElfStringTable;
75 class ElfSymbolTable;
76 class ElfFuncDescTable;
77
78 // ELF section, may or may not have cached data
79 class ElfSection VALUE_OBJ_CLASS_SPEC {
80 private:
81 Elf_Shdr _section_hdr;
82 void* _section_data;
83 NullDecoder::decoder_status _stat;
100 FILE* const _fd;
101 public:
102 FileReader(FILE* const fd) : _fd(fd) {};
103 bool read(void* buf, size_t size);
104 int read_buffer(void* buf, size_t size);
105 bool set_position(long offset);
106 };
107
108 // Mark current position, so we can get back to it after
109 // reads.
110 class MarkedFileReader : public FileReader {
111 private:
112 long _marked_pos;
113 public:
114 MarkedFileReader(FILE* const fd);
115 ~MarkedFileReader();
116
117 bool has_mark() const { return _marked_pos >= 0; }
118 };
119
120 // ElfFile is basically an elf file parser, which can lookup the symbol
121 // that is the nearest to the given address.
122 // Beware, this code is called from vm error reporting code, when vm is already
123 // in "error" state, so there are scenarios, lookup will fail. We want this
124 // part of code to be very defensive, and bait out if anything went wrong.
125 class ElfFile: public CHeapObj<mtInternal> {
126 friend class ElfDecoder;
127
128 private:
129 // link ElfFiles
130 ElfFile* _next;
131
132 // Elf file
133 char* _filepath;
134 FILE* _file;
135
136 // Elf header
137 Elf_Ehdr _elfHdr;
138
139 // symbol tables
140 ElfSymbolTable* _symbol_tables;
141
142 // regular string tables
143 ElfStringTable* _string_tables;
144
145 // section header string table, used for finding section name
146 ElfStringTable* _shdr_string_table;
147
148 // function descriptors table
149 ElfFuncDescTable* _funcDesc_table;
150
151 NullDecoder::decoder_status _status;
152
153 public:
154 ElfFile(const char* filepath);
155 ~ElfFile();
156
157 bool decode(address addr, char* buf, int buflen, int* offset);
158
159 const char* filepath() const {
160 return _filepath;
161 }
162
163 bool same_elf_file(const char* filepath) const {
164 assert(filepath != NULL, "null file path");
165 return (_filepath != NULL && !strcmp(filepath, _filepath));
166 }
167
168 NullDecoder::decoder_status get_status() const {
169 return _status;
170 }
171
172 // Returns true if the elf file is marked NOT to require an executable stack,
173 // or if the file could not be opened.
174 // Returns false if the elf file requires an executable stack, the stack flag
175 // is not set at all, or if the file can not be read.
176 // On systems other than linux it always returns false.
177 static bool specifies_noexecstack(const char* filepath) NOT_LINUX({ return false; });
178 private:
179 // sanity check, if the file is a real elf file
180 static bool is_elf_file(Elf_Ehdr&);
181
182 // parse this elf file
183 NullDecoder::decoder_status parse_elf(const char* filename);
184
185 // load string, symbol and function descriptor tables from the elf file
186 NullDecoder::decoder_status load_tables();
187
188 ElfFile* next() const { return _next; }
189 void set_next(ElfFile* file) { _next = file; }
190
191 // find a section by name, return section index
192 // if there is no such section, return -1
193 int section_by_name(const char* name, Elf_Shdr& hdr);
194
195 // string tables are stored in a linked list
196 void add_string_table(ElfStringTable* table);
197
198 // symbol tables are stored in a linked list
199 void add_symbol_table(ElfSymbolTable* table);
200
201 // return a string table at specified section index
202 ElfStringTable* get_string_table(int index);
203
|
28 #if !defined(_WINDOWS) && !defined(__APPLE__)
29
30 #if defined(__OpenBSD__)
31 #include <sys/exec_elf.h>
32 #else
33 #include <elf.h>
34 #endif
35 #include <stdio.h>
36
37 #ifdef _LP64
38
39 typedef Elf64_Half Elf_Half;
40 typedef Elf64_Word Elf_Word;
41 typedef Elf64_Off Elf_Off;
42 typedef Elf64_Addr Elf_Addr;
43
44 typedef Elf64_Ehdr Elf_Ehdr;
45 typedef Elf64_Shdr Elf_Shdr;
46 typedef Elf64_Phdr Elf_Phdr;
47 typedef Elf64_Sym Elf_Sym;
48 typedef Elf64_Nhdr Elf_Nhdr;
49
50 #if !defined(_ALLBSD_SOURCE) || defined(__APPLE__)
51 #define ELF_ST_TYPE ELF64_ST_TYPE
52 #endif
53
54 #else
55
56 typedef Elf32_Half Elf_Half;
57 typedef Elf32_Word Elf_Word;
58 typedef Elf32_Off Elf_Off;
59 typedef Elf32_Addr Elf_Addr;
60
61 typedef Elf32_Ehdr Elf_Ehdr;
62 typedef Elf32_Shdr Elf_Shdr;
63 typedef Elf32_Phdr Elf_Phdr;
64 typedef Elf32_Sym Elf_Sym;
65 typedef Elf32_Nhdr Elf_Nhdr;
66
67 #if !defined(_ALLBSD_SOURCE) || defined(__APPLE__)
68 #define ELF_ST_TYPE ELF32_ST_TYPE
69 #endif
70 #endif
71
72 #include "globalDefinitions.hpp"
73 #include "memory/allocation.hpp"
74 #include "utilities/decoder.hpp"
75
76 class ElfStringTable;
77 class ElfSymbolTable;
78 class ElfFuncDescTable;
79
80 // ELF section, may or may not have cached data
81 class ElfSection VALUE_OBJ_CLASS_SPEC {
82 private:
83 Elf_Shdr _section_hdr;
84 void* _section_data;
85 NullDecoder::decoder_status _stat;
102 FILE* const _fd;
103 public:
104 FileReader(FILE* const fd) : _fd(fd) {};
105 bool read(void* buf, size_t size);
106 int read_buffer(void* buf, size_t size);
107 bool set_position(long offset);
108 };
109
110 // Mark current position, so we can get back to it after
111 // reads.
112 class MarkedFileReader : public FileReader {
113 private:
114 long _marked_pos;
115 public:
116 MarkedFileReader(FILE* const fd);
117 ~MarkedFileReader();
118
119 bool has_mark() const { return _marked_pos >= 0; }
120 };
121
122 // Interface to external debug info file
123 class ElfDebugInfo : public CHeapObj<mtInternal> {
124 public:
125 virtual bool decode(address addr, char* const buf, size_t buflen, int* offset) = 0;
126 virtual bool has_error() const = 0;
127 };
128
129 // ElfFile is basically an elf file parser, which can lookup the symbol
130 // that is the nearest to the given address.
131 // Beware, this code is called from vm error reporting code, when vm is already
132 // in "error" state, so there are scenarios, lookup will fail. We want this
133 // part of code to be very defensive, and bait out if anything went wrong.
134 class ElfFile: public CHeapObj<mtInternal> {
135 friend class ElfDecoder;
136
137 private:
138 // link ElfFiles
139 ElfFile* _next;
140
141 // Elf file
142 char* _filepath;
143 FILE* _file;
144
145 // Elf header
146 Elf_Ehdr _elfHdr;
147
148 // symbol tables
149 ElfSymbolTable* _symbol_tables;
150
151 // regular string tables
152 ElfStringTable* _string_tables;
153
154 // section header string table, used for finding section name
155 ElfStringTable* _shdr_string_table;
156
157 // function descriptors table
158 ElfFuncDescTable* _funcDesc_table;
159
160 // external debug info
161 ElfDebugInfo* _debuginfo;
162
163 NullDecoder::decoder_status _status;
164
165 public:
166 ElfFile(const char* filepath, bool load_debug_info = true);
167 ~ElfFile();
168
169 bool decode(address addr, char* buf, int buflen, int* offset);
170
171 const char* filepath() const {
172 return _filepath;
173 }
174
175 bool same_elf_file(const char* filepath) const {
176 assert(filepath != NULL, "null file path");
177 return (_filepath != NULL && !strcmp(filepath, _filepath));
178 }
179
180 NullDecoder::decoder_status get_status() const {
181 return _status;
182 }
183
184 // Returns true if the elf file is marked NOT to require an executable stack,
185 // or if the file could not be opened.
186 // Returns false if the elf file requires an executable stack, the stack flag
187 // is not set at all, or if the file can not be read.
188 // On systems other than linux it always returns false.
189 static bool specifies_noexecstack(const char* filepath) NOT_LINUX({ return false; });
190 private:
191 // sanity check, if the file is a real elf file
192 static bool is_elf_file(Elf_Ehdr&);
193
194 // parse this elf file
195 NullDecoder::decoder_status parse_elf(const char* filename);
196
197 // load external debuginfo file for this file.
198 ElfDebugInfo* load_debuginfo() NOT_LINUX({ return NULL; });
199
200 // internal implementation
201 bool decode_impl(address addr, char* buf, int buflen, int* offset);
202
203 // load string, symbol and function descriptor tables from the elf file
204 NullDecoder::decoder_status load_tables();
205
206 ElfFile* next() const { return _next; }
207 void set_next(ElfFile* file) { _next = file; }
208
209 // find a section by name, return section index
210 // if there is no such section, return -1
211 int section_by_name(const char* name, Elf_Shdr& hdr);
212
213 // string tables are stored in a linked list
214 void add_string_table(ElfStringTable* table);
215
216 // symbol tables are stored in a linked list
217 void add_symbol_table(ElfSymbolTable* table);
218
219 // return a string table at specified section index
220 ElfStringTable* get_string_table(int index);
221
|