Line data Source code
1 : /* Generate ELF backend handle.
2 : Copyright (C) 2000-2017 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 : { "riscv", "elf_riscv", "riscv", 5, EM_RISCV, ELFCLASS64, ELFDATA2LSB },
138 : { "riscv", "elf_riscv", "riscv", 5, EM_RISCV, ELFCLASS32, ELFDATA2LSB },
139 : };
140 : #define nmachines (sizeof (machines) / sizeof (machines[0]))
141 :
142 : /* No machine prefix should be larger than this. */
143 : #define MAX_PREFIX_LEN 16
144 :
145 : /* Default callbacks. Mostly they just return the error value. */
146 : static const char *default_reloc_type_name (int ignore, char *buf, size_t len);
147 : static bool default_reloc_type_check (int ignore);
148 : static bool default_reloc_valid_use (Elf *elf, int ignore);
149 : static Elf_Type default_reloc_simple_type (Ebl *ebl, int ignore);
150 : static bool default_gotpc_reloc_check (Elf *elf, int ignore);
151 : static const char *default_segment_type_name (int ignore, char *buf,
152 : size_t len);
153 : static const char *default_section_type_name (int ignore, char *buf,
154 : size_t len);
155 : static const char *default_section_name (int ignore, int ignore2, char *buf,
156 : size_t len);
157 : static const char *default_machine_flag_name (Elf64_Word *ignore);
158 : static bool default_machine_flag_check (Elf64_Word flags);
159 : static bool default_machine_section_flag_check (GElf_Xword flags);
160 : static const char *default_symbol_type_name (int ignore, char *buf,
161 : size_t len);
162 : static const char *default_symbol_binding_name (int ignore, char *buf,
163 : size_t len);
164 : static const char *default_dynamic_tag_name (int64_t ignore, char *buf,
165 : size_t len);
166 : static bool default_dynamic_tag_check (int64_t ignore);
167 : static const char *default_osabi_name (int ignore, char *buf, size_t len);
168 : static void default_destr (struct ebl *ignore);
169 : static const char *default_core_note_type_name (uint32_t, char *buf,
170 : size_t len);
171 : static const char *default_object_note_type_name (const char *name, uint32_t,
172 : char *buf, size_t len);
173 : static int default_core_note (const GElf_Nhdr *nhdr, const char *name,
174 : GElf_Word *regs_offset, size_t *nregloc,
175 : const Ebl_Register_Location **reglocs,
176 : size_t *nitems, const Ebl_Core_Item **);
177 : static int default_auxv_info (GElf_Xword a_type,
178 : const char **name, const char **format);
179 : static bool default_object_note (const char *name, uint32_t type,
180 : uint32_t descsz, const char *desc);
181 : static bool default_debugscn_p (const char *name);
182 : static bool default_copy_reloc_p (int reloc);
183 : static bool default_none_reloc_p (int reloc);
184 : static bool default_relative_reloc_p (int reloc);
185 : static bool default_check_special_symbol (Elf *elf, GElf_Ehdr *ehdr,
186 : const GElf_Sym *sym,
187 : const char *name,
188 : const GElf_Shdr *destshdr);
189 : static bool default_data_marker_symbol (const GElf_Sym *sym, const char *sname);
190 : static bool default_check_st_other_bits (unsigned char st_other);
191 : static bool default_check_special_section (Ebl *, int,
192 : const GElf_Shdr *, const char *);
193 : static bool default_bss_plt_p (Elf *elf);
194 : static int default_return_value_location (Dwarf_Die *functypedie,
195 : const Dwarf_Op **locops);
196 : static ssize_t default_register_info (Ebl *ebl,
197 : int regno, char *name, size_t namelen,
198 : const char **prefix,
199 : const char **setname,
200 : int *bits, int *type);
201 : static int default_syscall_abi (Ebl *ebl, int *sp, int *pc,
202 : int *callno, int args[6]);
203 : static bool default_check_object_attribute (Ebl *ebl, const char *vendor,
204 : int tag, uint64_t value,
205 : const char **tag_name,
206 : const char **value_name);
207 : static bool default_check_reloc_target_type (Ebl *ebl, Elf64_Word sh_type);
208 : static int default_abi_cfi (Ebl *ebl, Dwarf_CIE *abi_info);
209 :
210 :
211 : static void
212 1098 : fill_defaults (Ebl *result)
213 : {
214 1098 : result->reloc_type_name = default_reloc_type_name;
215 1098 : result->reloc_type_check = default_reloc_type_check;
216 1098 : result->reloc_valid_use = default_reloc_valid_use;
217 1098 : result->reloc_simple_type = default_reloc_simple_type;
218 1098 : result->gotpc_reloc_check = default_gotpc_reloc_check;
219 1098 : result->segment_type_name = default_segment_type_name;
220 1098 : result->section_type_name = default_section_type_name;
221 1098 : result->section_name = default_section_name;
222 1098 : result->machine_flag_name = default_machine_flag_name;
223 1098 : result->machine_flag_check = default_machine_flag_check;
224 1098 : result->machine_section_flag_check = default_machine_section_flag_check;
225 1098 : result->check_special_section = default_check_special_section;
226 1098 : result->symbol_type_name = default_symbol_type_name;
227 1098 : result->symbol_binding_name = default_symbol_binding_name;
228 1098 : result->dynamic_tag_name = default_dynamic_tag_name;
229 1098 : result->dynamic_tag_check = default_dynamic_tag_check;
230 1098 : result->osabi_name = default_osabi_name;
231 1098 : result->core_note_type_name = default_core_note_type_name;
232 1098 : result->object_note_type_name = default_object_note_type_name;
233 1098 : result->core_note = default_core_note;
234 1098 : result->auxv_info = default_auxv_info;
235 1098 : result->object_note = default_object_note;
236 1098 : result->debugscn_p = default_debugscn_p;
237 1098 : result->copy_reloc_p = default_copy_reloc_p;
238 1098 : result->none_reloc_p = default_none_reloc_p;
239 1098 : result->relative_reloc_p = default_relative_reloc_p;
240 1098 : result->check_special_symbol = default_check_special_symbol;
241 1098 : result->data_marker_symbol = default_data_marker_symbol;
242 1098 : result->check_st_other_bits = default_check_st_other_bits;
243 1098 : result->bss_plt_p = default_bss_plt_p;
244 1098 : result->return_value_location = default_return_value_location;
245 1098 : result->register_info = default_register_info;
246 1098 : result->syscall_abi = default_syscall_abi;
247 1098 : result->check_object_attribute = default_check_object_attribute;
248 1098 : result->check_reloc_target_type = default_check_reloc_target_type;
249 1098 : result->disasm = NULL;
250 1098 : result->abi_cfi = default_abi_cfi;
251 1098 : result->destr = default_destr;
252 1098 : result->sysvhash_entrysize = sizeof (Elf32_Word);
253 1098 : }
254 :
255 :
256 : /* Find an appropriate backend for the file associated with ELF. */
257 : static Ebl *
258 1098 : openbackend (Elf *elf, const char *emulation, GElf_Half machine)
259 : {
260 : Ebl *result;
261 : size_t cnt;
262 :
263 : /* First allocate the data structure for the result. We do this
264 : here since this assures that the structure is always large
265 : enough. */
266 1098 : result = (Ebl *) calloc (1, sizeof (Ebl));
267 1098 : if (result == NULL)
268 : {
269 : // XXX uncomment
270 : // __libebl_seterror (ELF_E_NOMEM);
271 : return NULL;
272 : }
273 :
274 : /* Fill in the default callbacks. The initializer for the machine
275 : specific module can overwrite the values. */
276 1098 : fill_defaults (result);
277 :
278 : /* XXX Currently all we do is to look at 'e_machine' value in the
279 : ELF header. With an internal mapping table from EM_* value to
280 : DSO name we try to load the appropriate module to handle this
281 : binary type.
282 :
283 : Multiple modules for the same machine type are possible and they
284 : will be tried in sequence. The lookup process will only stop
285 : when a module which can handle the machine type is found or all
286 : available matching modules are tried. */
287 7433 : for (cnt = 0; cnt < nmachines; ++cnt)
288 7433 : if ((emulation != NULL && strcmp (emulation, machines[cnt].emulation) == 0)
289 7433 : || (emulation == NULL && machines[cnt].em == machine))
290 : {
291 : /* Well, we know the emulation name now. */
292 1098 : result->emulation = machines[cnt].emulation;
293 :
294 : /* We access some data structures directly. Make sure the 32 and
295 : 64 bit variants are laid out the same. */
296 : assert (offsetof (Elf32_Ehdr, e_machine)
297 : == offsetof (Elf64_Ehdr, e_machine));
298 : assert (sizeof (((Elf32_Ehdr *) 0)->e_machine)
299 : == sizeof (((Elf64_Ehdr *) 0)->e_machine));
300 : assert (offsetof (Elf, state.elf32.ehdr)
301 : == offsetof (Elf, state.elf64.ehdr));
302 :
303 : /* Prefer taking the information from the ELF file. */
304 1098 : if (elf == NULL)
305 : {
306 9 : result->machine = machines[cnt].em;
307 9 : result->class = machines[cnt].class;
308 9 : result->data = machines[cnt].data;
309 : }
310 : else
311 : {
312 1089 : result->machine = elf->state.elf32.ehdr->e_machine;
313 1089 : result->class = elf->state.elf32.ehdr->e_ident[EI_CLASS];
314 1089 : result->data = elf->state.elf32.ehdr->e_ident[EI_DATA];
315 : }
316 :
317 : #ifndef LIBEBL_SUBDIR
318 : # define LIBEBL_SUBDIR PACKAGE
319 : #endif
320 : #define ORIGINDIR "$ORIGIN/../$LIB/" LIBEBL_SUBDIR "/"
321 :
322 : /* Give it a try. At least the machine type matches. First
323 : try to load the module. */
324 : char dsoname[100];
325 3294 : strcpy (stpcpy (stpcpy (dsoname, ORIGINDIR "libebl_"),
326 : machines[cnt].dsoname),
327 : ".so");
328 :
329 1098 : void *h = dlopen (dsoname, RTLD_LAZY);
330 1098 : if (h == NULL)
331 : {
332 3294 : strcpy (stpcpy (stpcpy (dsoname, "libebl_"),
333 : machines[cnt].dsoname),
334 : ".so");
335 1098 : h = dlopen (dsoname, RTLD_LAZY);
336 : }
337 :
338 : /* Try without an explicit path. */
339 1098 : if (h != NULL)
340 : {
341 : /* We managed to load the object. Now see whether the
342 : initialization function likes our file. */
343 : static const char version[] = MODVERSION;
344 : const char *modversion;
345 : ebl_bhinit_t initp;
346 :
347 : // We use a static number to help the compiler see we don't
348 : // overflow the stack with an arbitrary number.
349 1098 : assert (machines[cnt].prefix_len <= MAX_PREFIX_LEN);
350 : char symname[MAX_PREFIX_LEN + sizeof "_init"];
351 :
352 2196 : strcpy (mempcpy (symname, machines[cnt].prefix,
353 : machines[cnt].prefix_len), "_init");
354 :
355 1098 : initp = (ebl_bhinit_t) dlsym (h, symname);
356 1098 : if (initp != NULL
357 1098 : && (modversion = initp (elf, machine, result, sizeof (Ebl)))
358 1098 : && strcmp (version, modversion) == 0)
359 : {
360 : /* We found a module to handle our file. */
361 1098 : result->dlhandle = h;
362 1098 : result->elf = elf;
363 :
364 : /* A few entries are mandatory. */
365 1098 : assert (result->name != NULL);
366 1098 : assert (result->destr != NULL);
367 :
368 1098 : return result;
369 : }
370 :
371 : /* Not the module we need. */
372 0 : (void) dlclose (h);
373 : }
374 :
375 : /* We cannot find a DSO but the emulation/machine ID matches.
376 : Return that information. */
377 0 : result->dlhandle = NULL;
378 0 : result->elf = elf;
379 0 : result->name = machines[cnt].prefix;
380 0 : fill_defaults (result);
381 :
382 0 : return result;
383 : }
384 :
385 : /* Nothing matched. We use only the default callbacks. */
386 0 : result->dlhandle = NULL;
387 0 : result->elf = elf;
388 0 : result->emulation = "<unknown>";
389 0 : result->name = "<unknown>";
390 0 : fill_defaults (result);
391 :
392 0 : return result;
393 : }
394 :
395 :
396 : /* Find an appropriate backend for the file associated with ELF. */
397 : Ebl *
398 1089 : ebl_openbackend (Elf *elf)
399 : {
400 : GElf_Ehdr ehdr_mem;
401 : GElf_Ehdr *ehdr;
402 :
403 : /* Get the ELF header of the object. */
404 1089 : ehdr = gelf_getehdr (elf, &ehdr_mem);
405 1089 : if (ehdr == NULL)
406 : {
407 : // XXX uncomment
408 : // __libebl_seterror (elf_errno ());
409 : return NULL;
410 : }
411 :
412 1089 : return openbackend (elf, NULL, ehdr->e_machine);
413 : }
414 :
415 :
416 : /* Find backend without underlying ELF file. */
417 : Ebl *
418 9 : ebl_openbackend_machine (GElf_Half machine)
419 : {
420 9 : return openbackend (NULL, NULL, machine);
421 : }
422 :
423 :
424 : /* Find backend with given emulation name. */
425 : Ebl *
426 0 : ebl_openbackend_emulation (const char *emulation)
427 : {
428 0 : return openbackend (NULL, emulation, EM_NONE);
429 : }
430 :
431 :
432 : /* Default callbacks. Mostly they just return the error value. */
433 : static const char *
434 0 : default_reloc_type_name (int ignore __attribute__ ((unused)),
435 : char *buf __attribute__ ((unused)),
436 : size_t len __attribute__ ((unused)))
437 : {
438 0 : return NULL;
439 : }
440 :
441 : static bool
442 0 : default_reloc_type_check (int ignore __attribute__ ((unused)))
443 : {
444 0 : return false;
445 : }
446 :
447 : static bool
448 0 : default_reloc_valid_use (Elf *elf __attribute__ ((unused)),
449 : int ignore __attribute__ ((unused)))
450 : {
451 0 : return false;
452 : }
453 :
454 : static Elf_Type
455 0 : default_reloc_simple_type (Ebl *eh __attribute__ ((unused)),
456 : int ignore __attribute__ ((unused)))
457 : {
458 0 : return ELF_T_NUM;
459 : }
460 :
461 : static bool
462 34135 : default_gotpc_reloc_check (Elf *elf __attribute__ ((unused)),
463 : int ignore __attribute__ ((unused)))
464 : {
465 34135 : return false;
466 : }
467 :
468 : static const char *
469 90 : default_segment_type_name (int ignore __attribute__ ((unused)),
470 : char *buf __attribute__ ((unused)),
471 : size_t len __attribute__ ((unused)))
472 : {
473 90 : return NULL;
474 : }
475 :
476 : static const char *
477 2148 : default_section_type_name (int ignore __attribute__ ((unused)),
478 : char *buf __attribute__ ((unused)),
479 : size_t len __attribute__ ((unused)))
480 : {
481 2148 : return NULL;
482 : }
483 :
484 : static const char *
485 33623 : default_section_name (int ignore __attribute__ ((unused)),
486 : int ignore2 __attribute__ ((unused)),
487 : char *buf __attribute__ ((unused)),
488 : size_t len __attribute__ ((unused)))
489 : {
490 33623 : return NULL;
491 : }
492 :
493 : static const char *
494 2 : default_machine_flag_name (Elf64_Word *ignore __attribute__ ((unused)))
495 : {
496 2 : return NULL;
497 : }
498 :
499 : static bool
500 110 : default_machine_flag_check (Elf64_Word flags __attribute__ ((unused)))
501 : {
502 110 : return flags == 0;
503 : }
504 :
505 : static bool
506 0 : default_machine_section_flag_check (GElf_Xword flags)
507 : {
508 0 : return flags == 0;
509 : }
510 :
511 : static bool
512 0 : default_check_special_section (Ebl *ebl __attribute__ ((unused)),
513 : int ndx __attribute__ ((unused)),
514 : const GElf_Shdr *shdr __attribute__ ((unused)),
515 : const char *sname __attribute__ ((unused)))
516 : {
517 0 : return false;
518 : }
519 :
520 : static const char *
521 67247 : default_symbol_type_name (int ignore __attribute__ ((unused)),
522 : char *buf __attribute__ ((unused)),
523 : size_t len __attribute__ ((unused)))
524 : {
525 67247 : return NULL;
526 : }
527 :
528 : static const char *
529 0 : default_symbol_binding_name (int ignore __attribute__ ((unused)),
530 : char *buf __attribute__ ((unused)),
531 : size_t len __attribute__ ((unused)))
532 : {
533 0 : return NULL;
534 : }
535 :
536 : static const char *
537 442 : default_dynamic_tag_name (int64_t ignore __attribute__ ((unused)),
538 : char *buf __attribute__ ((unused)),
539 : size_t len __attribute__ ((unused)))
540 : {
541 442 : return NULL;
542 : }
543 :
544 : static bool
545 1487 : default_dynamic_tag_check (int64_t ignore __attribute__ ((unused)))
546 : {
547 1487 : return false;
548 : }
549 :
550 : static void
551 1092 : default_destr (struct ebl *ignore __attribute__ ((unused)))
552 : {
553 1092 : }
554 :
555 : static const char *
556 32 : default_osabi_name (int ignore __attribute__ ((unused)),
557 : char *buf __attribute__ ((unused)),
558 : size_t len __attribute__ ((unused)))
559 : {
560 32 : return NULL;
561 : }
562 :
563 : static const char *
564 54 : default_core_note_type_name (uint32_t ignore __attribute__ ((unused)),
565 : char *buf __attribute__ ((unused)),
566 : size_t len __attribute__ ((unused)))
567 : {
568 54 : return NULL;
569 : }
570 :
571 : static int
572 74 : default_auxv_info (GElf_Xword a_type __attribute__ ((unused)),
573 : const char **name __attribute__ ((unused)),
574 : const char **format __attribute__ ((unused)))
575 : {
576 74 : return 0;
577 : }
578 :
579 : static int
580 0 : default_core_note (const GElf_Nhdr *nhdr __attribute__ ((unused)),
581 : const char *name __attribute__ ((unused)),
582 : GElf_Word *ro __attribute__ ((unused)),
583 : size_t *nregloc __attribute__ ((unused)),
584 : const Ebl_Register_Location **reglocs
585 : __attribute__ ((unused)),
586 : size_t *nitems __attribute__ ((unused)),
587 : const Ebl_Core_Item **items __attribute__ ((unused)))
588 : {
589 0 : return 0;
590 : }
591 :
592 : static const char *
593 32 : default_object_note_type_name (const char *name __attribute__ ((unused)),
594 : uint32_t ignore __attribute__ ((unused)),
595 : char *buf __attribute__ ((unused)),
596 : size_t len __attribute__ ((unused)))
597 : {
598 32 : return NULL;
599 : }
600 :
601 : static bool
602 32 : default_object_note (const char *name __attribute__ ((unused)),
603 : uint32_t type __attribute__ ((unused)),
604 : uint32_t descsz __attribute__ ((unused)),
605 : const char *desc __attribute__ ((unused)))
606 : {
607 32 : return NULL;
608 : }
609 :
610 : static bool
611 33922 : default_debugscn_p (const char *name)
612 : {
613 : /* We know by default only about the DWARF debug sections which have
614 : fixed names. */
615 : static const char *dwarf_scn_names[] =
616 : {
617 : /* DWARF 1 */
618 : ".debug",
619 : ".line",
620 : /* GNU DWARF 1 extensions */
621 : ".debug_srcinfo",
622 : ".debug_sfnames",
623 : /* DWARF 1.1 and DWARF 2 */
624 : ".debug_aranges",
625 : ".debug_pubnames",
626 : /* DWARF 2 */
627 : ".debug_info",
628 : ".debug_abbrev",
629 : ".debug_line",
630 : ".debug_frame",
631 : ".debug_str",
632 : ".debug_loc",
633 : ".debug_macinfo",
634 : /* DWARF 3 */
635 : ".debug_ranges",
636 : ".debug_pubtypes",
637 : /* DWARF 4 */
638 : ".debug_types",
639 : /* GDB DWARF 4 extension */
640 : ".gdb_index",
641 : /* GNU/DWARF 5 extension/proposal */
642 : ".debug_macro",
643 : /* DWARF 5 */
644 : ".debug_addr",
645 : ".debug_line_str",
646 : ".debug_loclists",
647 : ".debug_names",
648 : ".debug_rnglists",
649 : ".debug_str_offsets",
650 : /* SGI/MIPS DWARF 2 extensions */
651 : ".debug_weaknames",
652 : ".debug_funcnames",
653 : ".debug_typenames",
654 : ".debug_varnames"
655 : };
656 33922 : const size_t ndwarf_scn_names = (sizeof (dwarf_scn_names)
657 : / sizeof (dwarf_scn_names[0]));
658 590779 : for (size_t cnt = 0; cnt < ndwarf_scn_names; ++cnt)
659 578724 : if (strcmp (name, dwarf_scn_names[cnt]) == 0
660 556857 : || (strncmp (name, ".zdebug", strlen (".zdebug")) == 0
661 0 : && strcmp (&name[2], &dwarf_scn_names[cnt][1]) == 0))
662 : return true;
663 :
664 : return false;
665 : }
666 :
667 : static bool
668 0 : default_copy_reloc_p (int reloc __attribute__ ((unused)))
669 : {
670 0 : return false;
671 : }
672 : strong_alias (default_copy_reloc_p, default_none_reloc_p)
673 : strong_alias (default_copy_reloc_p, default_relative_reloc_p)
674 :
675 : static bool
676 114247 : default_check_special_symbol (Elf *elf __attribute__ ((unused)),
677 : GElf_Ehdr *ehdr __attribute__ ((unused)),
678 : const GElf_Sym *sym __attribute__ ((unused)),
679 : const char *name __attribute__ ((unused)),
680 : const GElf_Shdr *destshdr __attribute__ ((unused)))
681 : {
682 114247 : return false;
683 : }
684 :
685 : static bool
686 0 : default_data_marker_symbol (const GElf_Sym *sym __attribute__ ((unused)),
687 : const char *sname __attribute__ ((unused)))
688 : {
689 0 : return false;
690 : }
691 :
692 : static bool
693 0 : default_check_st_other_bits (unsigned char st_other __attribute__ ((unused)))
694 : {
695 0 : return false;
696 : }
697 :
698 :
699 : static bool
700 69 : default_bss_plt_p (Elf *elf __attribute__ ((unused)))
701 : {
702 69 : return false;
703 : }
704 :
705 : static int
706 0 : default_return_value_location (Dwarf_Die *functypedie __attribute__ ((unused)),
707 : const Dwarf_Op **locops __attribute__ ((unused)))
708 : {
709 0 : return -2;
710 : }
711 :
712 : static ssize_t
713 0 : default_register_info (Ebl *ebl __attribute__ ((unused)),
714 : int regno, char *name, size_t namelen,
715 : const char **prefix,
716 : const char **setname,
717 : int *bits, int *type)
718 : {
719 0 : if (name == NULL)
720 : return 0;
721 :
722 0 : *setname = "???";
723 0 : *prefix = "";
724 0 : *bits = -1;
725 0 : *type = DW_ATE_void;
726 0 : return snprintf (name, namelen, "reg%d", regno);
727 : }
728 :
729 : static int
730 0 : default_syscall_abi (Ebl *ebl __attribute__ ((unused)),
731 : int *sp, int *pc, int *callno, int args[6])
732 : {
733 0 : *sp = *pc = *callno = -1;
734 0 : args[0] = -1;
735 0 : args[1] = -1;
736 0 : args[2] = -1;
737 0 : args[3] = -1;
738 0 : args[4] = -1;
739 0 : args[5] = -1;
740 0 : return -1;
741 : }
742 :
743 : static bool
744 0 : default_check_object_attribute (Ebl *ebl __attribute__ ((unused)),
745 : const char *vendor __attribute__ ((unused)),
746 : int tag __attribute__ ((unused)),
747 : uint64_t value __attribute__ ((unused)),
748 : const char **tag_name, const char **value_name)
749 : {
750 0 : *tag_name = NULL;
751 0 : *value_name = NULL;
752 0 : return false;
753 : }
754 :
755 : static bool
756 205 : default_check_reloc_target_type (Ebl *ebl __attribute__ ((unused)),
757 : Elf64_Word sh_type __attribute__ ((unused)))
758 : {
759 205 : return false;
760 : }
761 :
762 : static int
763 0 : default_abi_cfi (Ebl *ebl __attribute__ ((unused)),
764 : Dwarf_CIE *abi_info __attribute__ ((unused)))
765 : {
766 0 : return -1;
767 : }
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