1/*
2 * Copyright (c) 2003-2005 The Regents of The University of Michigan
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;
9 * redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Authors: Steve Reinhardt
29 * Ali Saidi
30 */
31
32#include <string>
33
34#include "gelf.h"
35
36#include "base/loader/elf_object.hh"
37#include "base/loader/symtab.hh"
38#include "base/misc.hh"
39#include "base/trace.hh" // for DPRINTF
40#include "sim/byteswap.hh"
41
42using namespace std;
43
44ObjectFile *
45ElfObject::tryFile(const string &fname, int fd, size_t len, uint8_t *data)
46{
47 Elf *elf;
48 GElf_Ehdr ehdr;
49 Arch arch = UnknownArch;
50 OpSys opSys = UnknownOpSys;
51
52 // check that header matches library version
53 if (elf_version(EV_CURRENT) == EV_NONE)
54 panic("wrong elf version number!");
55
56 // get a pointer to elf structure
57 elf = elf_memory((char*)data,len);
58 // will only fail if fd is invalid
59 assert(elf != NULL);
60
61 // Check that we actually have a elf file
62 if (gelf_getehdr(elf, &ehdr) ==0) {
63 DPRINTFR(Loader, "Not ELF\n");
64 elf_end(elf);
65 return NULL;
66 } else {
67 //Detect the architecture
68 //Since we don't know how to check for alpha right now, we'll
69 //just assume if it wasn't something else and it's 64 bit, that's
70 //what it must be.
71 if (ehdr.e_machine == EM_SPARC64 ||
72 (ehdr.e_machine == EM_SPARC &&
73 ehdr.e_ident[EI_CLASS] == ELFCLASS64)||
74 ehdr.e_machine == EM_SPARCV9) {
75 arch = ObjectFile::SPARC64;
76 } else if (ehdr.e_machine == EM_SPARC32PLUS ||
77 (ehdr.e_machine == EM_SPARC &&
78 ehdr.e_ident[EI_CLASS] == ELFCLASS32)) {
79 arch = ObjectFile::SPARC32;
80 } else if (ehdr.e_machine == EM_MIPS
81 && ehdr.e_ident[EI_CLASS] == ELFCLASS32) {
82 arch = ObjectFile::Mips;
83 } else if (ehdr.e_machine == EM_X86_64 &&
84 ehdr.e_ident[EI_CLASS] == ELFCLASS64) {
85 //In the future, we might want to differentiate between 32 bit
86 //and 64 bit x86 processes in case there are differences in their
87 //initial stack frame.
88 arch = ObjectFile::X86;
89 } else if (ehdr.e_ident[EI_CLASS] == ELFCLASS64) {
90 arch = ObjectFile::Alpha;
91 } else {
92 warn("Unknown architecture: %d\n", ehdr.e_machine);
93 arch = ObjectFile::UnknownArch;
94 }
95
96 //Detect the operating system
97 switch (ehdr.e_ident[EI_OSABI])
98 {
99
100 case ELFOSABI_LINUX:
101 opSys = ObjectFile::Linux;
102 break;
103 case ELFOSABI_SOLARIS:
104 opSys = ObjectFile::Solaris;
105 break;
106 case ELFOSABI_TRU64:
107 opSys = ObjectFile::Tru64;
108 break;
109 default:
110 opSys = ObjectFile::UnknownOpSys;
111 }
112
113 //take a look at the .note.ABI section
114 //It can let us know what's what.
115 if (opSys == ObjectFile::UnknownOpSys) {
116 Elf_Scn *section;
117 GElf_Shdr shdr;
118 Elf_Data *data;
119 uint32_t osAbi;;
120 int secIdx = 1;
121
122 // Get the first section
123 section = elf_getscn(elf, secIdx);
124
125 // While there are no more sections
126 while (section != NULL && opSys == ObjectFile::UnknownOpSys) {
127 gelf_getshdr(section, &shdr);
128 if (shdr.sh_type == SHT_NOTE && !strcmp(".note.ABI-tag",
129 elf_strptr(elf, ehdr.e_shstrndx, shdr.sh_name))) {
130 // we have found a ABI note section
131 // Check the 5th 32bit word for OS 0 == linux, 1 == hurd,
132 // 2 == solaris, 3 == freebsd
133 data = elf_rawdata(section, NULL);
134 assert(data->d_buf);
135 if(ehdr.e_ident[EI_DATA] == ELFDATA2LSB)
136 osAbi = htole(((uint32_t*)data->d_buf)[4]);
137 else
138 osAbi = htobe(((uint32_t*)data->d_buf)[4]);
139
140 switch(osAbi) {
141 case 0:
142 opSys = ObjectFile::Linux;
143 break;
144 case 2:
145 opSys = ObjectFile::Solaris;
146 break;
147 }
148 } // if section found
149 if (!strcmp(".SUNW_version", elf_strptr(elf, ehdr.e_shstrndx, shdr.sh_name)))
150 opSys = ObjectFile::Solaris;
151 if (!strcmp(".stab.index", elf_strptr(elf, ehdr.e_shstrndx, shdr.sh_name)))
152 opSys = ObjectFile::Solaris;
153
154 section = elf_getscn(elf, ++secIdx);
155 } // while sections
156 }
157
158 ElfObject * result = new ElfObject(fname, fd, len, data, arch, opSys);
159
160 //The number of headers in the file
161 result->_programHeaderCount = ehdr.e_phnum;
162 //Record the size of each entry
163 result->_programHeaderSize = ehdr.e_phentsize;
164 if(result->_programHeaderCount) //If there is a program header table
165 {
166 //Figure out the virtual address of the header table in the
167 //final memory image. We use the program headers themselves
168 //to translate from a file offset to the address in the image.
169 GElf_Phdr phdr;
170 uint64_t e_phoff = ehdr.e_phoff;
171 result->_programHeaderTable = 0;
172 for(int hdrnum = 0; hdrnum < result->_programHeaderCount; hdrnum++)
173 {
174 gelf_getphdr(elf, hdrnum, &phdr);
175 //Check if we've found the segment with the headers in it
176 if(phdr.p_offset <= e_phoff &&
177 phdr.p_offset + phdr.p_filesz > e_phoff)
178 {
179 result->_programHeaderTable = phdr.p_paddr + e_phoff;
180 break;
181 }
182 }
183 }
184 else
185 result->_programHeaderTable = 0;
186
187
188 elf_end(elf);
189 return result;
190 }
191}
192
193
194ElfObject::ElfObject(const string &_filename, int _fd,
195 size_t _len, uint8_t *_data,
196 Arch _arch, OpSys _opSys)
197 : ObjectFile(_filename, _fd, _len, _data, _arch, _opSys)
198
199{
200 Elf *elf;
201 GElf_Ehdr ehdr;
202
203 // check that header matches library version
204 if (elf_version(EV_CURRENT) == EV_NONE)
205 panic("wrong elf version number!");
206
207 // get a pointer to elf structure
208 elf = elf_memory((char*)fileData,len);
209 // will only fail if fd is invalid
210 assert(elf != NULL);
211
212 // Check that we actually have a elf file
213 if (gelf_getehdr(elf, &ehdr) ==0) {
214 panic("Not ELF, shouldn't be here");
215 }
216
217 entry = ehdr.e_entry;
218
219 // initialize segment sizes to 0 in case they're not present
220 text.size = data.size = bss.size = 0;
221
222 int secIdx = 1;
223 Elf_Scn *section;
224 GElf_Shdr shdr;
225
226 // The first address of some important sections.
227 Addr textSecStart = 0;
228 Addr dataSecStart = 0;
229 Addr bssSecStart = 0;
230
231 // Get the first section
232 section = elf_getscn(elf, secIdx);
233
234 // Find the beginning of the most interesting sections.
235 while (section != NULL) {
236 gelf_getshdr(section, &shdr);
237 char * secName = elf_strptr(elf, ehdr.e_shstrndx, shdr.sh_name);
238
239 if (!strcmp(".text", secName)) {
240 textSecStart = shdr.sh_addr;
241 } else if (!strcmp(".data", secName)) {
242 dataSecStart = shdr.sh_addr;
243 } else if (!strcmp(".bss", secName)) {
244 bssSecStart = shdr.sh_addr;
245 }
246
247 section = elf_getscn(elf, ++secIdx);
248 }
249
250 // Go through all the segments in the program, record them, and scrape
251 // out information about the text, data, and bss areas needed by other
252 // code.
253 for (int i = 0; i < ehdr.e_phnum; ++i) {
254 GElf_Phdr phdr;
255 if (gelf_getphdr(elf, i, &phdr) == 0) {
256 panic("gelf_getphdr failed for segment %d.", i);
257 }
258
259 // for now we don't care about non-loadable segments
260 if (!(phdr.p_type & PT_LOAD))
261 continue;
262
263 // Check to see if this segment contains the bss section.
264 if (phdr.p_paddr <= bssSecStart &&
265 phdr.p_paddr + phdr.p_memsz > bssSecStart &&
266 phdr.p_memsz - phdr.p_filesz > 0) {
267 bss.baseAddr = phdr.p_paddr + phdr.p_filesz;
268 bss.size = phdr.p_memsz - phdr.p_filesz;
269 bss.fileImage = NULL;
270 }
271
272 // Check to see if this is the text or data segment
| 1/*
2 * Copyright (c) 2003-2005 The Regents of The University of Michigan
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;
9 * redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Authors: Steve Reinhardt
29 * Ali Saidi
30 */
31
32#include <string>
33
34#include "gelf.h"
35
36#include "base/loader/elf_object.hh"
37#include "base/loader/symtab.hh"
38#include "base/misc.hh"
39#include "base/trace.hh" // for DPRINTF
40#include "sim/byteswap.hh"
41
42using namespace std;
43
44ObjectFile *
45ElfObject::tryFile(const string &fname, int fd, size_t len, uint8_t *data)
46{
47 Elf *elf;
48 GElf_Ehdr ehdr;
49 Arch arch = UnknownArch;
50 OpSys opSys = UnknownOpSys;
51
52 // check that header matches library version
53 if (elf_version(EV_CURRENT) == EV_NONE)
54 panic("wrong elf version number!");
55
56 // get a pointer to elf structure
57 elf = elf_memory((char*)data,len);
58 // will only fail if fd is invalid
59 assert(elf != NULL);
60
61 // Check that we actually have a elf file
62 if (gelf_getehdr(elf, &ehdr) ==0) {
63 DPRINTFR(Loader, "Not ELF\n");
64 elf_end(elf);
65 return NULL;
66 } else {
67 //Detect the architecture
68 //Since we don't know how to check for alpha right now, we'll
69 //just assume if it wasn't something else and it's 64 bit, that's
70 //what it must be.
71 if (ehdr.e_machine == EM_SPARC64 ||
72 (ehdr.e_machine == EM_SPARC &&
73 ehdr.e_ident[EI_CLASS] == ELFCLASS64)||
74 ehdr.e_machine == EM_SPARCV9) {
75 arch = ObjectFile::SPARC64;
76 } else if (ehdr.e_machine == EM_SPARC32PLUS ||
77 (ehdr.e_machine == EM_SPARC &&
78 ehdr.e_ident[EI_CLASS] == ELFCLASS32)) {
79 arch = ObjectFile::SPARC32;
80 } else if (ehdr.e_machine == EM_MIPS
81 && ehdr.e_ident[EI_CLASS] == ELFCLASS32) {
82 arch = ObjectFile::Mips;
83 } else if (ehdr.e_machine == EM_X86_64 &&
84 ehdr.e_ident[EI_CLASS] == ELFCLASS64) {
85 //In the future, we might want to differentiate between 32 bit
86 //and 64 bit x86 processes in case there are differences in their
87 //initial stack frame.
88 arch = ObjectFile::X86;
89 } else if (ehdr.e_ident[EI_CLASS] == ELFCLASS64) {
90 arch = ObjectFile::Alpha;
91 } else {
92 warn("Unknown architecture: %d\n", ehdr.e_machine);
93 arch = ObjectFile::UnknownArch;
94 }
95
96 //Detect the operating system
97 switch (ehdr.e_ident[EI_OSABI])
98 {
99
100 case ELFOSABI_LINUX:
101 opSys = ObjectFile::Linux;
102 break;
103 case ELFOSABI_SOLARIS:
104 opSys = ObjectFile::Solaris;
105 break;
106 case ELFOSABI_TRU64:
107 opSys = ObjectFile::Tru64;
108 break;
109 default:
110 opSys = ObjectFile::UnknownOpSys;
111 }
112
113 //take a look at the .note.ABI section
114 //It can let us know what's what.
115 if (opSys == ObjectFile::UnknownOpSys) {
116 Elf_Scn *section;
117 GElf_Shdr shdr;
118 Elf_Data *data;
119 uint32_t osAbi;;
120 int secIdx = 1;
121
122 // Get the first section
123 section = elf_getscn(elf, secIdx);
124
125 // While there are no more sections
126 while (section != NULL && opSys == ObjectFile::UnknownOpSys) {
127 gelf_getshdr(section, &shdr);
128 if (shdr.sh_type == SHT_NOTE && !strcmp(".note.ABI-tag",
129 elf_strptr(elf, ehdr.e_shstrndx, shdr.sh_name))) {
130 // we have found a ABI note section
131 // Check the 5th 32bit word for OS 0 == linux, 1 == hurd,
132 // 2 == solaris, 3 == freebsd
133 data = elf_rawdata(section, NULL);
134 assert(data->d_buf);
135 if(ehdr.e_ident[EI_DATA] == ELFDATA2LSB)
136 osAbi = htole(((uint32_t*)data->d_buf)[4]);
137 else
138 osAbi = htobe(((uint32_t*)data->d_buf)[4]);
139
140 switch(osAbi) {
141 case 0:
142 opSys = ObjectFile::Linux;
143 break;
144 case 2:
145 opSys = ObjectFile::Solaris;
146 break;
147 }
148 } // if section found
149 if (!strcmp(".SUNW_version", elf_strptr(elf, ehdr.e_shstrndx, shdr.sh_name)))
150 opSys = ObjectFile::Solaris;
151 if (!strcmp(".stab.index", elf_strptr(elf, ehdr.e_shstrndx, shdr.sh_name)))
152 opSys = ObjectFile::Solaris;
153
154 section = elf_getscn(elf, ++secIdx);
155 } // while sections
156 }
157
158 ElfObject * result = new ElfObject(fname, fd, len, data, arch, opSys);
159
160 //The number of headers in the file
161 result->_programHeaderCount = ehdr.e_phnum;
162 //Record the size of each entry
163 result->_programHeaderSize = ehdr.e_phentsize;
164 if(result->_programHeaderCount) //If there is a program header table
165 {
166 //Figure out the virtual address of the header table in the
167 //final memory image. We use the program headers themselves
168 //to translate from a file offset to the address in the image.
169 GElf_Phdr phdr;
170 uint64_t e_phoff = ehdr.e_phoff;
171 result->_programHeaderTable = 0;
172 for(int hdrnum = 0; hdrnum < result->_programHeaderCount; hdrnum++)
173 {
174 gelf_getphdr(elf, hdrnum, &phdr);
175 //Check if we've found the segment with the headers in it
176 if(phdr.p_offset <= e_phoff &&
177 phdr.p_offset + phdr.p_filesz > e_phoff)
178 {
179 result->_programHeaderTable = phdr.p_paddr + e_phoff;
180 break;
181 }
182 }
183 }
184 else
185 result->_programHeaderTable = 0;
186
187
188 elf_end(elf);
189 return result;
190 }
191}
192
193
194ElfObject::ElfObject(const string &_filename, int _fd,
195 size_t _len, uint8_t *_data,
196 Arch _arch, OpSys _opSys)
197 : ObjectFile(_filename, _fd, _len, _data, _arch, _opSys)
198
199{
200 Elf *elf;
201 GElf_Ehdr ehdr;
202
203 // check that header matches library version
204 if (elf_version(EV_CURRENT) == EV_NONE)
205 panic("wrong elf version number!");
206
207 // get a pointer to elf structure
208 elf = elf_memory((char*)fileData,len);
209 // will only fail if fd is invalid
210 assert(elf != NULL);
211
212 // Check that we actually have a elf file
213 if (gelf_getehdr(elf, &ehdr) ==0) {
214 panic("Not ELF, shouldn't be here");
215 }
216
217 entry = ehdr.e_entry;
218
219 // initialize segment sizes to 0 in case they're not present
220 text.size = data.size = bss.size = 0;
221
222 int secIdx = 1;
223 Elf_Scn *section;
224 GElf_Shdr shdr;
225
226 // The first address of some important sections.
227 Addr textSecStart = 0;
228 Addr dataSecStart = 0;
229 Addr bssSecStart = 0;
230
231 // Get the first section
232 section = elf_getscn(elf, secIdx);
233
234 // Find the beginning of the most interesting sections.
235 while (section != NULL) {
236 gelf_getshdr(section, &shdr);
237 char * secName = elf_strptr(elf, ehdr.e_shstrndx, shdr.sh_name);
238
239 if (!strcmp(".text", secName)) {
240 textSecStart = shdr.sh_addr;
241 } else if (!strcmp(".data", secName)) {
242 dataSecStart = shdr.sh_addr;
243 } else if (!strcmp(".bss", secName)) {
244 bssSecStart = shdr.sh_addr;
245 }
246
247 section = elf_getscn(elf, ++secIdx);
248 }
249
250 // Go through all the segments in the program, record them, and scrape
251 // out information about the text, data, and bss areas needed by other
252 // code.
253 for (int i = 0; i < ehdr.e_phnum; ++i) {
254 GElf_Phdr phdr;
255 if (gelf_getphdr(elf, i, &phdr) == 0) {
256 panic("gelf_getphdr failed for segment %d.", i);
257 }
258
259 // for now we don't care about non-loadable segments
260 if (!(phdr.p_type & PT_LOAD))
261 continue;
262
263 // Check to see if this segment contains the bss section.
264 if (phdr.p_paddr <= bssSecStart &&
265 phdr.p_paddr + phdr.p_memsz > bssSecStart &&
266 phdr.p_memsz - phdr.p_filesz > 0) {
267 bss.baseAddr = phdr.p_paddr + phdr.p_filesz;
268 bss.size = phdr.p_memsz - phdr.p_filesz;
269 bss.fileImage = NULL;
270 }
271
272 // Check to see if this is the text or data segment
|
280 data.baseAddr = phdr.p_paddr;
281 data.size = phdr.p_filesz;
282 data.fileImage = fileData + phdr.p_offset;
283 } else {
284 Segment extra;
285 extra.baseAddr = phdr.p_paddr;
286 extra.size = phdr.p_filesz;
287 extra.fileImage = fileData + phdr.p_offset;
288 extraSegments.push_back(extra);
289 }
290 }
291
292 // should have found at least one loadable segment
293 assert(text.size != 0);
294
295 DPRINTFR(Loader, "text: 0x%x %d\ndata: 0x%x %d\nbss: 0x%x %d\n",
296 text.baseAddr, text.size, data.baseAddr, data.size,
297 bss.baseAddr, bss.size);
298
299 elf_end(elf);
300
301 // We will actually read the sections when we need to load them
302}
303
304
305bool
306ElfObject::loadSomeSymbols(SymbolTable *symtab, int binding)
307{
308 Elf *elf;
309 int sec_idx = 1; // there is a 0 but it is nothing, go figure
310 Elf_Scn *section;
311 GElf_Shdr shdr;
312 Elf_Data *data;
313 int count, ii;
314 bool found = false;
315 GElf_Sym sym;
316
317 if (!symtab)
318 return false;
319
320 // check that header matches library version
321 if (elf_version(EV_CURRENT) == EV_NONE)
322 panic("wrong elf version number!");
323
324 // get a pointer to elf structure
325 elf = elf_memory((char*)fileData,len);
326
327 assert(elf != NULL);
328
329 // Get the first section
330 section = elf_getscn(elf, sec_idx);
331
332 // While there are no more sections
333 while (section != NULL) {
334 gelf_getshdr(section, &shdr);
335
336 if (shdr.sh_type == SHT_SYMTAB) {
337 found = true;
338 data = elf_getdata(section, NULL);
339 count = shdr.sh_size / shdr.sh_entsize;
340 DPRINTF(Loader, "Found Symbol Table, %d symbols present\n", count);
341
342 // loop through all the symbols, only loading global ones
343 for (ii = 0; ii < count; ++ii) {
344 gelf_getsym(data, ii, &sym);
345 if (GELF_ST_BIND(sym.st_info) == binding) {
346 symtab->insert(sym.st_value,
347 elf_strptr(elf, shdr.sh_link, sym.st_name));
348 }
349 }
350 }
351 ++sec_idx;
352 section = elf_getscn(elf, sec_idx);
353 }
354
355 elf_end(elf);
356
357 return found;
358}
359
360bool
361ElfObject::loadGlobalSymbols(SymbolTable *symtab, Addr addrMask)
362{
363 return loadSomeSymbols(symtab, STB_GLOBAL);
364}
365
366bool
367ElfObject::loadLocalSymbols(SymbolTable *symtab, Addr addrMask)
368{
369 return loadSomeSymbols(symtab, STB_LOCAL);
370}
371
372bool
373ElfObject::loadSections(Port *memPort, Addr addrMask)
374{
375 if (!ObjectFile::loadSections(memPort, addrMask))
376 return false;
377
378 vector<Segment>::iterator extraIt;
379 for (extraIt = extraSegments.begin();
380 extraIt != extraSegments.end(); extraIt++) {
381 if (!loadSection(&(*extraIt), memPort, addrMask)) {
382 return false;
383 }
384 }
385 return true;
386}
387
388void
389ElfObject::getSections()
390{
391 Elf *elf;
392 int sec_idx = 1; // there is a 0 but it is nothing, go figure
393 Elf_Scn *section;
394 GElf_Shdr shdr;
395
396 GElf_Ehdr ehdr;
397
398 assert(!sectionNames.size());
399
400 // check that header matches library version
401 if (elf_version(EV_CURRENT) == EV_NONE)
402 panic("wrong elf version number!");
403
404 // get a pointer to elf structure
405 elf = elf_memory((char*)fileData,len);
406 assert(elf != NULL);
407
408 // Check that we actually have a elf file
409 if (gelf_getehdr(elf, &ehdr) ==0) {
410 panic("Not ELF, shouldn't be here");
411 }
412
413 // Get the first section
414 section = elf_getscn(elf, sec_idx);
415
416 // While there are no more sections
417 while (section != NULL) {
418 gelf_getshdr(section, &shdr);
419 sectionNames.insert(elf_strptr(elf, ehdr.e_shstrndx, shdr.sh_name));
420 section = elf_getscn(elf, ++sec_idx);
421 } // while sections
422}
423
424bool
425ElfObject::sectionExists(string sec)
426{
427 if (!sectionNames.size())
428 getSections();
429 return sectionNames.find(sec) != sectionNames.end();
430}
431
432
| 280 data.baseAddr = phdr.p_paddr;
281 data.size = phdr.p_filesz;
282 data.fileImage = fileData + phdr.p_offset;
283 } else {
284 Segment extra;
285 extra.baseAddr = phdr.p_paddr;
286 extra.size = phdr.p_filesz;
287 extra.fileImage = fileData + phdr.p_offset;
288 extraSegments.push_back(extra);
289 }
290 }
291
292 // should have found at least one loadable segment
293 assert(text.size != 0);
294
295 DPRINTFR(Loader, "text: 0x%x %d\ndata: 0x%x %d\nbss: 0x%x %d\n",
296 text.baseAddr, text.size, data.baseAddr, data.size,
297 bss.baseAddr, bss.size);
298
299 elf_end(elf);
300
301 // We will actually read the sections when we need to load them
302}
303
304
305bool
306ElfObject::loadSomeSymbols(SymbolTable *symtab, int binding)
307{
308 Elf *elf;
309 int sec_idx = 1; // there is a 0 but it is nothing, go figure
310 Elf_Scn *section;
311 GElf_Shdr shdr;
312 Elf_Data *data;
313 int count, ii;
314 bool found = false;
315 GElf_Sym sym;
316
317 if (!symtab)
318 return false;
319
320 // check that header matches library version
321 if (elf_version(EV_CURRENT) == EV_NONE)
322 panic("wrong elf version number!");
323
324 // get a pointer to elf structure
325 elf = elf_memory((char*)fileData,len);
326
327 assert(elf != NULL);
328
329 // Get the first section
330 section = elf_getscn(elf, sec_idx);
331
332 // While there are no more sections
333 while (section != NULL) {
334 gelf_getshdr(section, &shdr);
335
336 if (shdr.sh_type == SHT_SYMTAB) {
337 found = true;
338 data = elf_getdata(section, NULL);
339 count = shdr.sh_size / shdr.sh_entsize;
340 DPRINTF(Loader, "Found Symbol Table, %d symbols present\n", count);
341
342 // loop through all the symbols, only loading global ones
343 for (ii = 0; ii < count; ++ii) {
344 gelf_getsym(data, ii, &sym);
345 if (GELF_ST_BIND(sym.st_info) == binding) {
346 symtab->insert(sym.st_value,
347 elf_strptr(elf, shdr.sh_link, sym.st_name));
348 }
349 }
350 }
351 ++sec_idx;
352 section = elf_getscn(elf, sec_idx);
353 }
354
355 elf_end(elf);
356
357 return found;
358}
359
360bool
361ElfObject::loadGlobalSymbols(SymbolTable *symtab, Addr addrMask)
362{
363 return loadSomeSymbols(symtab, STB_GLOBAL);
364}
365
366bool
367ElfObject::loadLocalSymbols(SymbolTable *symtab, Addr addrMask)
368{
369 return loadSomeSymbols(symtab, STB_LOCAL);
370}
371
372bool
373ElfObject::loadSections(Port *memPort, Addr addrMask)
374{
375 if (!ObjectFile::loadSections(memPort, addrMask))
376 return false;
377
378 vector<Segment>::iterator extraIt;
379 for (extraIt = extraSegments.begin();
380 extraIt != extraSegments.end(); extraIt++) {
381 if (!loadSection(&(*extraIt), memPort, addrMask)) {
382 return false;
383 }
384 }
385 return true;
386}
387
388void
389ElfObject::getSections()
390{
391 Elf *elf;
392 int sec_idx = 1; // there is a 0 but it is nothing, go figure
393 Elf_Scn *section;
394 GElf_Shdr shdr;
395
396 GElf_Ehdr ehdr;
397
398 assert(!sectionNames.size());
399
400 // check that header matches library version
401 if (elf_version(EV_CURRENT) == EV_NONE)
402 panic("wrong elf version number!");
403
404 // get a pointer to elf structure
405 elf = elf_memory((char*)fileData,len);
406 assert(elf != NULL);
407
408 // Check that we actually have a elf file
409 if (gelf_getehdr(elf, &ehdr) ==0) {
410 panic("Not ELF, shouldn't be here");
411 }
412
413 // Get the first section
414 section = elf_getscn(elf, sec_idx);
415
416 // While there are no more sections
417 while (section != NULL) {
418 gelf_getshdr(section, &shdr);
419 sectionNames.insert(elf_strptr(elf, ehdr.e_shstrndx, shdr.sh_name));
420 section = elf_getscn(elf, ++sec_idx);
421 } // while sections
422}
423
424bool
425ElfObject::sectionExists(string sec)
426{
427 if (!sectionNames.size())
428 getSections();
429 return sectionNames.find(sec) != sectionNames.end();
430}
431
432
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