Line data Source code
1 : /* Generate ELF backend handle.
2 : Copyright (C) 2000-2016 Red Hat, Inc.
3 : This file is part of elfutils.
4 :
5 : This file is free software; you can redistribute it and/or modify
6 : it under the terms of either
7 :
8 : * the GNU Lesser General Public License as published by the Free
9 : Software Foundation; either version 3 of the License, or (at
10 : your option) any later version
11 :
12 : or
13 :
14 : * the GNU General Public License as published by the Free
15 : Software Foundation; either version 2 of the License, or (at
16 : your option) any later version
17 :
18 : or both in parallel, as here.
19 :
20 : elfutils is distributed in the hope that it will be useful, but
21 : WITHOUT ANY WARRANTY; without even the implied warranty of
22 : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23 : General Public License for more details.
24 :
25 : You should have received copies of the GNU General Public License and
26 : the GNU Lesser General Public License along with this program. If
27 : not, see <http://www.gnu.org/licenses/>. */
28 :
29 : #ifdef HAVE_CONFIG_H
30 : # include <config.h>
31 : #endif
32 :
33 : #include <assert.h>
34 : #include <dlfcn.h>
35 : #include <error.h>
36 : #include <libelfP.h>
37 : #include <dwarf.h>
38 : #include <stdlib.h>
39 : #include <string.h>
40 : #include <stdio.h>
41 :
42 : #include <system.h>
43 : #include <libeblP.h>
44 :
45 :
46 : /* This table should contain the complete list of architectures as far
47 : as the ELF specification is concerned. */
48 : /* XXX When things are stable replace the string pointers with char
49 : arrays to avoid relocations. */
50 : static const struct
51 : {
52 : const char *dsoname;
53 : const char *emulation;
54 : const char *prefix;
55 : int prefix_len;
56 : int em;
57 : int class;
58 : int data;
59 : } machines[] =
60 : {
61 : { "i386", "elf_i386", "i386", 4, EM_386, ELFCLASS32, ELFDATA2LSB },
62 : { "ia64", "elf_ia64", "ia64", 4, EM_IA_64, ELFCLASS64, ELFDATA2LSB },
63 : { "alpha", "elf_alpha", "alpha", 5, EM_ALPHA, ELFCLASS64, ELFDATA2LSB },
64 : { "x86_64", "elf_x86_64", "x86_64", 6, EM_X86_64, ELFCLASS64, ELFDATA2LSB },
65 : { "ppc", "elf_ppc", "ppc", 3, EM_PPC, ELFCLASS32, ELFDATA2MSB },
66 : { "ppc64", "elf_ppc64", "ppc64", 5, EM_PPC64, ELFCLASS64, ELFDATA2MSB },
67 : { "tilegx", "elf_tilegx", "tilegx", 6, EM_TILEGX, ELFCLASS64, ELFDATA2LSB },
68 : // XXX class and machine fields need to be filled in for all archs.
69 : { "sh", "elf_sh", "sh", 2, EM_SH, 0, 0 },
70 : { "arm", "ebl_arm", "arm", 3, EM_ARM, 0, 0 },
71 : { "sparc", "elf_sparcv9", "sparc", 5, EM_SPARCV9, 0, 0 },
72 : { "sparc", "elf_sparc", "sparc", 5, EM_SPARC, 0, 0 },
73 : { "sparc", "elf_sparcv8plus", "sparc", 5, EM_SPARC32PLUS, 0, 0 },
74 : { "s390", "ebl_s390", "s390", 4, EM_S390, 0, 0 },
75 :
76 : { "m32", "elf_m32", "m32", 3, EM_M32, 0, 0 },
77 : { "m68k", "elf_m68k", "m68k", 4, EM_68K, ELFCLASS32, ELFDATA2MSB },
78 : { "m88k", "elf_m88k", "m88k", 4, EM_88K, 0, 0 },
79 : { "i860", "elf_i860", "i860", 4, EM_860, 0, 0 },
80 : { "s370", "ebl_s370", "s370", 4, EM_S370, 0, 0 },
81 : { "parisc", "elf_parisc", "parisc", 6, EM_PARISC, 0, 0 },
82 : { "vpp500", "elf_vpp500", "vpp500", 5, EM_VPP500, 0, 0 },
83 : { "sparc", "elf_v8plus", "v8plus", 6, EM_SPARC32PLUS, 0, 0 },
84 : { "i960", "elf_i960", "i960", 4, EM_960, 0, 0 },
85 : { "v800", "ebl_v800", "v800", 4, EM_V800, 0, 0 },
86 : { "fr20", "ebl_fr20", "fr20", 4, EM_FR20, 0, 0 },
87 : { "rh32", "ebl_rh32", "rh32", 4, EM_RH32, 0, 0 },
88 : { "rce", "ebl_rce", "rce", 3, EM_RCE, 0, 0 },
89 : { "tricore", "elf_tricore", "tricore", 7, EM_TRICORE, 0, 0 },
90 : { "arc", "elf_arc", "arc", 3, EM_ARC, 0, 0 },
91 : { "h8", "elf_h8_300", "h8_300", 6, EM_H8_300, 0, 0 },
92 : { "h8", "elf_h8_300h", "h8_300h", 6, EM_H8_300H, 0, 0 },
93 : { "h8", "elf_h8s", "h8s", 6, EM_H8S, 0, 0 },
94 : { "h8", "elf_h8_500", "h8_500", 6, EM_H8_500, 0, 0 },
95 : { "coldfire", "elf_coldfire", "coldfire", 8, EM_COLDFIRE, 0, 0 },
96 : { "m68k", "elf_68hc12", "68hc12", 6, EM_68HC12, 0, 0 },
97 : { "mma", "elf_mma", "mma", 3, EM_MMA, 0, 0 },
98 : { "pcp", "elf_pcp", "pcp", 3, EM_PCP, 0, 0 },
99 : { "ncpu", "elf_ncpu", "ncpu", 4, EM_NCPU, 0, 0 },
100 : { "ndr1", "elf_ndr1", "ndr1", 4, EM_NDR1, 0, 0 },
101 : { "starcore", "elf_starcore", "starcore", 8, EM_STARCORE, 0, 0 },
102 : { "me16", "elf_me16", "em16", 4, EM_ME16, 0, 0 },
103 : { "st100", "elf_st100", "st100", 5, EM_ST100, 0, 0 },
104 : { "tinyj", "elf_tinyj", "tinyj", 5, EM_TINYJ, 0, 0 },
105 : { "pdsp", "elf_pdsp", "pdsp", 4, EM_PDSP, 0, 0 },
106 : { "fx66", "elf_fx66", "fx66", 4, EM_FX66, 0, 0 },
107 : { "st9plus", "elf_st9plus", "st9plus", 7, EM_ST9PLUS, 0, 0 },
108 : { "st7", "elf_st7", "st7", 3, EM_ST7, 0, 0 },
109 : { "m68k", "elf_68hc16", "68hc16", 6, EM_68HC16, 0, 0 },
110 : { "m68k", "elf_68hc11", "68hc11", 6, EM_68HC11, 0, 0 },
111 : { "m68k", "elf_68hc08", "68hc08", 6, EM_68HC08, 0, 0 },
112 : { "m68k", "elf_68hc05", "68hc05", 6, EM_68HC05, 0, 0 },
113 : { "svx", "elf_svx", "svx", 3, EM_SVX, 0, 0 },
114 : { "st19", "elf_st19", "st19", 4, EM_ST19, 0, 0 },
115 : { "vax", "elf_vax", "vax", 3, EM_VAX, 0, 0 },
116 : { "cris", "elf_cris", "cris", 4, EM_CRIS, 0, 0 },
117 : { "javelin", "elf_javelin", "javelin", 7, EM_JAVELIN, 0, 0 },
118 : { "firepath", "elf_firepath", "firepath", 8, EM_FIREPATH, 0, 0 },
119 : { "zsp", "elf_zsp", "zsp", 3, EM_ZSP, 0, 0 },
120 : { "mmix", "elf_mmix", "mmix", 4, EM_MMIX, 0, 0 },
121 : { "hunay", "elf_huany", "huany", 5, EM_HUANY, 0, 0 },
122 : { "prism", "elf_prism", "prism", 5, EM_PRISM, 0, 0 },
123 : { "avr", "elf_avr", "avr", 3, EM_AVR, 0, 0 },
124 : { "fr30", "elf_fr30", "fr30", 4, EM_FR30, 0, 0 },
125 : { "dv10", "elf_dv10", "dv10", 4, EM_D10V, 0, 0 },
126 : { "dv30", "elf_dv30", "dv30", 4, EM_D30V, 0, 0 },
127 : { "v850", "elf_v850", "v850", 4, EM_V850, 0, 0 },
128 : { "m32r", "elf_m32r", "m32r", 4, EM_M32R, 0, 0 },
129 : { "mn10300", "elf_mn10300", "mn10300", 7, EM_MN10300, 0, 0 },
130 : { "mn10200", "elf_mn10200", "mn10200", 7, EM_MN10200, 0, 0 },
131 : { "pj", "elf_pj", "pj", 2, EM_PJ, 0, 0 },
132 : { "openrisc", "elf_openrisc", "openrisc", 8, EM_OPENRISC, 0, 0 },
133 : { "arc", "elf_arc_a5", "arc_a5", 6, EM_ARC_A5, 0, 0 },
134 : { "xtensa", "elf_xtensa", "xtensa", 6, EM_XTENSA, 0, 0 },
135 : { "aarch64", "elf_aarch64", "aarch64", 7, EM_AARCH64, ELFCLASS64, 0 },
136 : { "bpf", "elf_bpf", "bpf", 3, EM_BPF, 0, 0 },
137 : };
138 : #define nmachines (sizeof (machines) / sizeof (machines[0]))
139 :
140 : /* No machine prefix should be larger than this. */
141 : #define MAX_PREFIX_LEN 16
142 :
143 : /* Default callbacks. Mostly they just return the error value. */
144 : static const char *default_reloc_type_name (int ignore, char *buf, size_t len);
145 : static bool default_reloc_type_check (int ignore);
146 : static bool default_reloc_valid_use (Elf *elf, int ignore);
147 : static Elf_Type default_reloc_simple_type (Ebl *ebl, int ignore);
148 : static bool default_gotpc_reloc_check (Elf *elf, int ignore);
149 : static const char *default_segment_type_name (int ignore, char *buf,
150 : size_t len);
151 : static const char *default_section_type_name (int ignore, char *buf,
152 : size_t len);
153 : static const char *default_section_name (int ignore, int ignore2, char *buf,
154 : size_t len);
155 : static const char *default_machine_flag_name (Elf64_Word *ignore);
156 : static bool default_machine_flag_check (Elf64_Word flags);
157 : static bool default_machine_section_flag_check (GElf_Xword flags);
158 : static const char *default_symbol_type_name (int ignore, char *buf,
159 : size_t len);
160 : static const char *default_symbol_binding_name (int ignore, char *buf,
161 : size_t len);
162 : static const char *default_dynamic_tag_name (int64_t ignore, char *buf,
163 : size_t len);
164 : static bool default_dynamic_tag_check (int64_t ignore);
165 : static const char *default_osabi_name (int ignore, char *buf, size_t len);
166 : static void default_destr (struct ebl *ignore);
167 : static const char *default_core_note_type_name (uint32_t, char *buf,
168 : size_t len);
169 : static const char *default_object_note_type_name (const char *name, uint32_t,
170 : char *buf, size_t len);
171 : static int default_core_note (const GElf_Nhdr *nhdr, const char *name,
172 : GElf_Word *regs_offset, size_t *nregloc,
173 : const Ebl_Register_Location **reglocs,
174 : size_t *nitems, const Ebl_Core_Item **);
175 : static int default_auxv_info (GElf_Xword a_type,
176 : const char **name, const char **format);
177 : static bool default_object_note (const char *name, uint32_t type,
178 : uint32_t descsz, const char *desc);
179 : static bool default_debugscn_p (const char *name);
180 : static bool default_copy_reloc_p (int reloc);
181 : static bool default_none_reloc_p (int reloc);
182 : static bool default_relative_reloc_p (int reloc);
183 : static bool default_check_special_symbol (Elf *elf, GElf_Ehdr *ehdr,
184 : const GElf_Sym *sym,
185 : const char *name,
186 : const GElf_Shdr *destshdr);
187 : static bool default_check_st_other_bits (unsigned char st_other);
188 : static bool default_check_special_section (Ebl *, int,
189 : const GElf_Shdr *, const char *);
190 : static bool default_bss_plt_p (Elf *elf);
191 : static int default_return_value_location (Dwarf_Die *functypedie,
192 : const Dwarf_Op **locops);
193 : static ssize_t default_register_info (Ebl *ebl,
194 : int regno, char *name, size_t namelen,
195 : const char **prefix,
196 : const char **setname,
197 : int *bits, int *type);
198 : static int default_syscall_abi (Ebl *ebl, int *sp, int *pc,
199 : int *callno, int args[6]);
200 : static bool default_check_object_attribute (Ebl *ebl, const char *vendor,
201 : int tag, uint64_t value,
202 : const char **tag_name,
203 : const char **value_name);
204 : static bool default_check_reloc_target_type (Ebl *ebl, Elf64_Word sh_type);
205 : static int default_abi_cfi (Ebl *ebl, Dwarf_CIE *abi_info);
206 :
207 :
208 : static void
209 892 : fill_defaults (Ebl *result)
210 : {
211 892 : result->reloc_type_name = default_reloc_type_name;
212 892 : result->reloc_type_check = default_reloc_type_check;
213 892 : result->reloc_valid_use = default_reloc_valid_use;
214 892 : result->reloc_simple_type = default_reloc_simple_type;
215 892 : result->gotpc_reloc_check = default_gotpc_reloc_check;
216 892 : result->segment_type_name = default_segment_type_name;
217 892 : result->section_type_name = default_section_type_name;
218 892 : result->section_name = default_section_name;
219 892 : result->machine_flag_name = default_machine_flag_name;
220 892 : result->machine_flag_check = default_machine_flag_check;
221 892 : result->machine_section_flag_check = default_machine_section_flag_check;
222 892 : result->check_special_section = default_check_special_section;
223 892 : result->symbol_type_name = default_symbol_type_name;
224 892 : result->symbol_binding_name = default_symbol_binding_name;
225 892 : result->dynamic_tag_name = default_dynamic_tag_name;
226 892 : result->dynamic_tag_check = default_dynamic_tag_check;
227 892 : result->osabi_name = default_osabi_name;
228 892 : result->core_note_type_name = default_core_note_type_name;
229 892 : result->object_note_type_name = default_object_note_type_name;
230 892 : result->core_note = default_core_note;
231 892 : result->auxv_info = default_auxv_info;
232 892 : result->object_note = default_object_note;
233 892 : result->debugscn_p = default_debugscn_p;
234 892 : result->copy_reloc_p = default_copy_reloc_p;
235 892 : result->none_reloc_p = default_none_reloc_p;
236 892 : result->relative_reloc_p = default_relative_reloc_p;
237 892 : result->check_special_symbol = default_check_special_symbol;
238 892 : result->check_st_other_bits = default_check_st_other_bits;
239 892 : result->bss_plt_p = default_bss_plt_p;
240 892 : result->return_value_location = default_return_value_location;
241 892 : result->register_info = default_register_info;
242 892 : result->syscall_abi = default_syscall_abi;
243 892 : result->check_object_attribute = default_check_object_attribute;
244 892 : result->check_reloc_target_type = default_check_reloc_target_type;
245 892 : result->disasm = NULL;
246 892 : result->abi_cfi = default_abi_cfi;
247 892 : result->destr = default_destr;
248 892 : result->sysvhash_entrysize = sizeof (Elf32_Word);
249 892 : }
250 :
251 :
252 : /* Find an appropriate backend for the file associated with ELF. */
253 : static Ebl *
254 892 : openbackend (Elf *elf, const char *emulation, GElf_Half machine)
255 : {
256 : Ebl *result;
257 : size_t cnt;
258 :
259 : /* First allocate the data structure for the result. We do this
260 : here since this assures that the structure is always large
261 : enough. */
262 892 : result = (Ebl *) calloc (1, sizeof (Ebl));
263 892 : if (result == NULL)
264 : {
265 : // XXX uncomment
266 : // __libebl_seterror (ELF_E_NOMEM);
267 : return NULL;
268 : }
269 :
270 : /* Fill in the default callbacks. The initializer for the machine
271 : specific module can overwrite the values. */
272 892 : fill_defaults (result);
273 :
274 : /* XXX Currently all we do is to look at 'e_machine' value in the
275 : ELF header. With an internal mapping table from EM_* value to
276 : DSO name we try to load the appropriate module to handle this
277 : binary type.
278 :
279 : Multiple modules for the same machine type are possible and they
280 : will be tried in sequence. The lookup process will only stop
281 : when a module which can handle the machine type is found or all
282 : available matching modules are tried. */
283 5734 : for (cnt = 0; cnt < nmachines; ++cnt)
284 5734 : if ((emulation != NULL && strcmp (emulation, machines[cnt].emulation) == 0)
285 5734 : || (emulation == NULL && machines[cnt].em == machine))
286 : {
287 : /* Well, we know the emulation name now. */
288 892 : result->emulation = machines[cnt].emulation;
289 :
290 : /* We access some data structures directly. Make sure the 32 and
291 : 64 bit variants are laid out the same. */
292 : assert (offsetof (Elf32_Ehdr, e_machine)
293 : == offsetof (Elf64_Ehdr, e_machine));
294 : assert (sizeof (((Elf32_Ehdr *) 0)->e_machine)
295 : == sizeof (((Elf64_Ehdr *) 0)->e_machine));
296 : assert (offsetof (Elf, state.elf32.ehdr)
297 : == offsetof (Elf, state.elf64.ehdr));
298 :
299 : /* Prefer taking the information from the ELF file. */
300 892 : if (elf == NULL)
301 : {
302 9 : result->machine = machines[cnt].em;
303 9 : result->class = machines[cnt].class;
304 9 : result->data = machines[cnt].data;
305 : }
306 : else
307 : {
308 883 : result->machine = elf->state.elf32.ehdr->e_machine;
309 883 : result->class = elf->state.elf32.ehdr->e_ident[EI_CLASS];
310 883 : result->data = elf->state.elf32.ehdr->e_ident[EI_DATA];
311 : }
312 :
313 : #ifndef LIBEBL_SUBDIR
314 : # define LIBEBL_SUBDIR PACKAGE
315 : #endif
316 : #define ORIGINDIR "$ORIGIN/../$LIB/" LIBEBL_SUBDIR "/"
317 :
318 : /* Give it a try. At least the machine type matches. First
319 : try to load the module. */
320 : char dsoname[100];
321 2676 : strcpy (stpcpy (stpcpy (dsoname, ORIGINDIR "libebl_"),
322 : machines[cnt].dsoname),
323 : ".so");
324 :
325 892 : void *h = dlopen (dsoname, RTLD_LAZY);
326 892 : if (h == NULL)
327 : {
328 2676 : strcpy (stpcpy (stpcpy (dsoname, "libebl_"),
329 : machines[cnt].dsoname),
330 : ".so");
331 892 : h = dlopen (dsoname, RTLD_LAZY);
332 : }
333 :
334 : /* Try without an explicit path. */
335 892 : if (h != NULL)
336 : {
337 : /* We managed to load the object. Now see whether the
338 : initialization function likes our file. */
339 : static const char version[] = MODVERSION;
340 : const char *modversion;
341 : ebl_bhinit_t initp;
342 :
343 : // We use a static number to help the compiler see we don't
344 : // overflow the stack with an arbitrary number.
345 892 : assert (machines[cnt].prefix_len <= MAX_PREFIX_LEN);
346 : char symname[MAX_PREFIX_LEN + sizeof "_init"];
347 :
348 2676 : strcpy (mempcpy (symname, machines[cnt].prefix,
349 : machines[cnt].prefix_len), "_init");
350 :
351 892 : initp = (ebl_bhinit_t) dlsym (h, symname);
352 892 : if (initp != NULL
353 892 : && (modversion = initp (elf, machine, result, sizeof (Ebl)))
354 892 : && strcmp (version, modversion) == 0)
355 : {
356 : /* We found a module to handle our file. */
357 892 : result->dlhandle = h;
358 892 : result->elf = elf;
359 :
360 : /* A few entries are mandatory. */
361 892 : assert (result->name != NULL);
362 892 : assert (result->destr != NULL);
363 :
364 892 : return result;
365 : }
366 :
367 : /* Not the module we need. */
368 0 : (void) dlclose (h);
369 : }
370 :
371 : /* We cannot find a DSO but the emulation/machine ID matches.
372 : Return that information. */
373 0 : result->dlhandle = NULL;
374 0 : result->elf = elf;
375 0 : result->name = machines[cnt].prefix;
376 0 : fill_defaults (result);
377 :
378 0 : return result;
379 : }
380 :
381 : /* Nothing matched. We use only the default callbacks. */
382 0 : result->dlhandle = NULL;
383 0 : result->elf = elf;
384 0 : result->emulation = "<unknown>";
385 0 : result->name = "<unknown>";
386 0 : fill_defaults (result);
387 :
388 0 : return result;
389 : }
390 :
391 :
392 : /* Find an appropriate backend for the file associated with ELF. */
393 : Ebl *
394 883 : ebl_openbackend (Elf *elf)
395 : {
396 : GElf_Ehdr ehdr_mem;
397 : GElf_Ehdr *ehdr;
398 :
399 : /* Get the ELF header of the object. */
400 883 : ehdr = gelf_getehdr (elf, &ehdr_mem);
401 883 : if (ehdr == NULL)
402 : {
403 : // XXX uncomment
404 : // __libebl_seterror (elf_errno ());
405 : return NULL;
406 : }
407 :
408 883 : return openbackend (elf, NULL, ehdr->e_machine);
409 : }
410 :
411 :
412 : /* Find backend without underlying ELF file. */
413 : Ebl *
414 9 : ebl_openbackend_machine (GElf_Half machine)
415 : {
416 9 : return openbackend (NULL, NULL, machine);
417 : }
418 :
419 :
420 : /* Find backend with given emulation name. */
421 : Ebl *
422 0 : ebl_openbackend_emulation (const char *emulation)
423 : {
424 0 : return openbackend (NULL, emulation, EM_NONE);
425 : }
426 :
427 :
428 : /* Default callbacks. Mostly they just return the error value. */
429 : static const char *
430 0 : default_reloc_type_name (int ignore __attribute__ ((unused)),
431 : char *buf __attribute__ ((unused)),
432 : size_t len __attribute__ ((unused)))
433 : {
434 0 : return NULL;
435 : }
436 :
437 : static bool
438 0 : default_reloc_type_check (int ignore __attribute__ ((unused)))
439 : {
440 0 : return false;
441 : }
442 :
443 : static bool
444 0 : default_reloc_valid_use (Elf *elf __attribute__ ((unused)),
445 : int ignore __attribute__ ((unused)))
446 : {
447 0 : return false;
448 : }
449 :
450 : static Elf_Type
451 0 : default_reloc_simple_type (Ebl *eh __attribute__ ((unused)),
452 : int ignore __attribute__ ((unused)))
453 : {
454 0 : return ELF_T_NUM;
455 : }
456 :
457 : static bool
458 32671 : default_gotpc_reloc_check (Elf *elf __attribute__ ((unused)),
459 : int ignore __attribute__ ((unused)))
460 : {
461 32671 : return false;
462 : }
463 :
464 : static const char *
465 110 : default_segment_type_name (int ignore __attribute__ ((unused)),
466 : char *buf __attribute__ ((unused)),
467 : size_t len __attribute__ ((unused)))
468 : {
469 110 : return NULL;
470 : }
471 :
472 : static const char *
473 1283 : default_section_type_name (int ignore __attribute__ ((unused)),
474 : char *buf __attribute__ ((unused)),
475 : size_t len __attribute__ ((unused)))
476 : {
477 1283 : return NULL;
478 : }
479 :
480 : static const char *
481 34759 : default_section_name (int ignore __attribute__ ((unused)),
482 : int ignore2 __attribute__ ((unused)),
483 : char *buf __attribute__ ((unused)),
484 : size_t len __attribute__ ((unused)))
485 : {
486 34759 : return NULL;
487 : }
488 :
489 : static const char *
490 0 : default_machine_flag_name (Elf64_Word *ignore __attribute__ ((unused)))
491 : {
492 0 : return NULL;
493 : }
494 :
495 : static bool
496 117 : default_machine_flag_check (Elf64_Word flags __attribute__ ((unused)))
497 : {
498 117 : return flags == 0;
499 : }
500 :
501 : static bool
502 0 : default_machine_section_flag_check (GElf_Xword flags)
503 : {
504 0 : return flags == 0;
505 : }
506 :
507 : static bool
508 0 : default_check_special_section (Ebl *ebl __attribute__ ((unused)),
509 : int ndx __attribute__ ((unused)),
510 : const GElf_Shdr *shdr __attribute__ ((unused)),
511 : const char *sname __attribute__ ((unused)))
512 : {
513 0 : return false;
514 : }
515 :
516 : static const char *
517 69519 : default_symbol_type_name (int ignore __attribute__ ((unused)),
518 : char *buf __attribute__ ((unused)),
519 : size_t len __attribute__ ((unused)))
520 : {
521 69519 : return NULL;
522 : }
523 :
524 : static const char *
525 0 : default_symbol_binding_name (int ignore __attribute__ ((unused)),
526 : char *buf __attribute__ ((unused)),
527 : size_t len __attribute__ ((unused)))
528 : {
529 0 : return NULL;
530 : }
531 :
532 : static const char *
533 511 : default_dynamic_tag_name (int64_t ignore __attribute__ ((unused)),
534 : char *buf __attribute__ ((unused)),
535 : size_t len __attribute__ ((unused)))
536 : {
537 511 : return NULL;
538 : }
539 :
540 : static bool
541 1445 : default_dynamic_tag_check (int64_t ignore __attribute__ ((unused)))
542 : {
543 1445 : return false;
544 : }
545 :
546 : static void
547 881 : default_destr (struct ebl *ignore __attribute__ ((unused)))
548 : {
549 881 : }
550 :
551 : static const char *
552 32 : default_osabi_name (int ignore __attribute__ ((unused)),
553 : char *buf __attribute__ ((unused)),
554 : size_t len __attribute__ ((unused)))
555 : {
556 32 : return NULL;
557 : }
558 :
559 : static const char *
560 54 : default_core_note_type_name (uint32_t ignore __attribute__ ((unused)),
561 : char *buf __attribute__ ((unused)),
562 : size_t len __attribute__ ((unused)))
563 : {
564 54 : return NULL;
565 : }
566 :
567 : static int
568 74 : default_auxv_info (GElf_Xword a_type __attribute__ ((unused)),
569 : const char **name __attribute__ ((unused)),
570 : const char **format __attribute__ ((unused)))
571 : {
572 74 : return 0;
573 : }
574 :
575 : static int
576 0 : default_core_note (const GElf_Nhdr *nhdr __attribute__ ((unused)),
577 : const char *name __attribute__ ((unused)),
578 : GElf_Word *ro __attribute__ ((unused)),
579 : size_t *nregloc __attribute__ ((unused)),
580 : const Ebl_Register_Location **reglocs
581 : __attribute__ ((unused)),
582 : size_t *nitems __attribute__ ((unused)),
583 : const Ebl_Core_Item **items __attribute__ ((unused)))
584 : {
585 0 : return 0;
586 : }
587 :
588 : static const char *
589 34 : default_object_note_type_name (const char *name __attribute__ ((unused)),
590 : uint32_t ignore __attribute__ ((unused)),
591 : char *buf __attribute__ ((unused)),
592 : size_t len __attribute__ ((unused)))
593 : {
594 34 : return NULL;
595 : }
596 :
597 : static bool
598 34 : default_object_note (const char *name __attribute__ ((unused)),
599 : uint32_t type __attribute__ ((unused)),
600 : uint32_t descsz __attribute__ ((unused)),
601 : const char *desc __attribute__ ((unused)))
602 : {
603 34 : return NULL;
604 : }
605 :
606 : static bool
607 31237 : default_debugscn_p (const char *name)
608 : {
609 : /* We know by default only about the DWARF debug sections which have
610 : fixed names. */
611 : static const char *dwarf_scn_names[] =
612 : {
613 : /* DWARF 1 */
614 : ".debug",
615 : ".line",
616 : /* GNU DWARF 1 extensions */
617 : ".debug_srcinfo",
618 : ".debug_sfnames",
619 : /* DWARF 1.1 and DWARF 2 */
620 : ".debug_aranges",
621 : ".debug_pubnames",
622 : /* DWARF 2 */
623 : ".debug_info",
624 : ".debug_abbrev",
625 : ".debug_line",
626 : ".debug_frame",
627 : ".debug_str",
628 : ".debug_loc",
629 : ".debug_macinfo",
630 : /* DWARF 3 */
631 : ".debug_ranges",
632 : ".debug_pubtypes",
633 : /* DWARF 4 */
634 : ".debug_types",
635 : /* GDB DWARF 4 extension */
636 : ".gdb_index",
637 : /* GNU/DWARF 5 extension/proposal */
638 : ".debug_macro",
639 : /* SGI/MIPS DWARF 2 extensions */
640 : ".debug_weaknames",
641 : ".debug_funcnames",
642 : ".debug_typenames",
643 : ".debug_varnames"
644 : };
645 31237 : const size_t ndwarf_scn_names = (sizeof (dwarf_scn_names)
646 : / sizeof (dwarf_scn_names[0]));
647 456225 : for (size_t cnt = 0; cnt < ndwarf_scn_names; ++cnt)
648 446920 : if (strcmp (name, dwarf_scn_names[cnt]) == 0
649 424988 : || (strncmp (name, ".zdebug", strlen (".zdebug")) == 0
650 0 : && strcmp (&name[2], &dwarf_scn_names[cnt][1]) == 0))
651 : return true;
652 :
653 : return false;
654 : }
655 :
656 : static bool
657 0 : default_copy_reloc_p (int reloc __attribute__ ((unused)))
658 : {
659 0 : return false;
660 : }
661 : strong_alias (default_copy_reloc_p, default_none_reloc_p)
662 : strong_alias (default_copy_reloc_p, default_relative_reloc_p)
663 :
664 : static bool
665 118133 : default_check_special_symbol (Elf *elf __attribute__ ((unused)),
666 : GElf_Ehdr *ehdr __attribute__ ((unused)),
667 : const GElf_Sym *sym __attribute__ ((unused)),
668 : const char *name __attribute__ ((unused)),
669 : const GElf_Shdr *destshdr __attribute__ ((unused)))
670 : {
671 118133 : return false;
672 : }
673 :
674 : static bool
675 0 : default_check_st_other_bits (unsigned char st_other __attribute__ ((unused)))
676 : {
677 0 : return false;
678 : }
679 :
680 :
681 : static bool
682 57 : default_bss_plt_p (Elf *elf __attribute__ ((unused)))
683 : {
684 57 : return false;
685 : }
686 :
687 : static int
688 0 : default_return_value_location (Dwarf_Die *functypedie __attribute__ ((unused)),
689 : const Dwarf_Op **locops __attribute__ ((unused)))
690 : {
691 0 : return -2;
692 : }
693 :
694 : static ssize_t
695 0 : default_register_info (Ebl *ebl __attribute__ ((unused)),
696 : int regno, char *name, size_t namelen,
697 : const char **prefix,
698 : const char **setname,
699 : int *bits, int *type)
700 : {
701 0 : if (name == NULL)
702 : return 0;
703 :
704 0 : *setname = "???";
705 0 : *prefix = "";
706 0 : *bits = -1;
707 0 : *type = DW_ATE_void;
708 0 : return snprintf (name, namelen, "reg%d", regno);
709 : }
710 :
711 : static int
712 0 : default_syscall_abi (Ebl *ebl __attribute__ ((unused)),
713 : int *sp, int *pc, int *callno, int args[6])
714 : {
715 0 : *sp = *pc = *callno = -1;
716 0 : args[0] = -1;
717 0 : args[1] = -1;
718 0 : args[2] = -1;
719 0 : args[3] = -1;
720 0 : args[4] = -1;
721 0 : args[5] = -1;
722 0 : return -1;
723 : }
724 :
725 : static bool
726 0 : default_check_object_attribute (Ebl *ebl __attribute__ ((unused)),
727 : const char *vendor __attribute__ ((unused)),
728 : int tag __attribute__ ((unused)),
729 : uint64_t value __attribute__ ((unused)),
730 : const char **tag_name, const char **value_name)
731 : {
732 0 : *tag_name = NULL;
733 0 : *value_name = NULL;
734 0 : return false;
735 : }
736 :
737 : static bool
738 197 : default_check_reloc_target_type (Ebl *ebl __attribute__ ((unused)),
739 : Elf64_Word sh_type __attribute__ ((unused)))
740 : {
741 197 : return false;
742 : }
743 :
744 : static int
745 0 : default_abi_cfi (Ebl *ebl __attribute__ ((unused)),
746 : Dwarf_CIE *abi_info __attribute__ ((unused)))
747 : {
748 0 : return -1;
749 : }
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