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vm: restore stacktrace on SIGSEGV
[minix.git] / sys / lib / libsa / loadfile_elf32.c
blob1418e8f922331b1b1f196d31a35e658803f01d29
1 /* $NetBSD: loadfile_elf32.c,v 1.29 2011/02/17 21:15:31 christos Exp $ */
2
3 /*-
4 * Copyright (c) 1997, 2008 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
9 * NASA Ames Research Center and by Christos Zoulas.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
31 */
32
33 /* If not included by exec_elf64.c, ELFSIZE won't be defined. */
34 #ifndef ELFSIZE
35 #define ELFSIZE 32
36 #endif
37
38 #ifdef _STANDALONE
39 #include <lib/libsa/stand.h>
40 #include <lib/libkern/libkern.h>
41 #else
42 #include <stdio.h>
43 #include <string.h>
44 #include <errno.h>
45 #include <stdlib.h>
46 #include <unistd.h>
47 #include <fcntl.h>
48 #include <err.h>
49 #endif
50
51 #include <sys/param.h>
52 #include <sys/exec.h>
53
54 #include "loadfile.h"
55
56 #if ((ELFSIZE == 32) && defined(BOOT_ELF32)) || \
57 ((ELFSIZE == 64) && defined(BOOT_ELF64))
58
59 #define ELFROUND (ELFSIZE / 8)
60
61 #ifndef _STANDALONE
62 #include "byteorder.h"
63
64 /*
65 * Byte swapping may be necessary in the non-_STANDLONE case because
66 * we may be built with a host compiler.
67 */
68 #define E16(f) \
69 f = (bo == ELFDATA2LSB) ? sa_htole16(f) : sa_htobe16(f)
70 #define E32(f) \
71 f = (bo == ELFDATA2LSB) ? sa_htole32(f) : sa_htobe32(f)
72 #define E64(f) \
73 f = (bo == ELFDATA2LSB) ? sa_htole64(f) : sa_htobe64(f)
74
75 #define I16(f) \
76 f = (bo == ELFDATA2LSB) ? sa_le16toh(f) : sa_be16toh(f)
77 #define I32(f) \
78 f = (bo == ELFDATA2LSB) ? sa_le32toh(f) : sa_be32toh(f)
79 #define I64(f) \
80 f = (bo == ELFDATA2LSB) ? sa_le64toh(f) : sa_be64toh(f)
81
82 static void
83 internalize_ehdr(Elf_Byte bo, Elf_Ehdr *ehdr)
84 {
85
86 #if ELFSIZE == 32
87 I16(ehdr->e_type);
88 I16(ehdr->e_machine);
89 I32(ehdr->e_version);
90 I32(ehdr->e_entry);
91 I32(ehdr->e_phoff);
92 I32(ehdr->e_shoff);
93 I32(ehdr->e_flags);
94 I16(ehdr->e_ehsize);
95 I16(ehdr->e_phentsize);
96 I16(ehdr->e_phnum);
97 I16(ehdr->e_shentsize);
98 I16(ehdr->e_shnum);
99 I16(ehdr->e_shstrndx);
100 #elif ELFSIZE == 64
101 I16(ehdr->e_type);
102 I16(ehdr->e_machine);
103 I32(ehdr->e_version);
104 I64(ehdr->e_entry);
105 I64(ehdr->e_phoff);
106 I64(ehdr->e_shoff);
107 I32(ehdr->e_flags);
108 I16(ehdr->e_ehsize);
109 I16(ehdr->e_phentsize);
110 I16(ehdr->e_phnum);
111 I16(ehdr->e_shentsize);
112 I16(ehdr->e_shnum);
113 I16(ehdr->e_shstrndx);
114 #else
115 #error ELFSIZE is not 32 or 64
116 #endif
117 }
118
119 static void
120 externalize_ehdr(Elf_Byte bo, Elf_Ehdr *ehdr)
121 {
122
123 #if ELFSIZE == 32
124 E16(ehdr->e_type);
125 E16(ehdr->e_machine);
126 E32(ehdr->e_version);
127 E32(ehdr->e_entry);
128 E32(ehdr->e_phoff);
129 E32(ehdr->e_shoff);
130 E32(ehdr->e_flags);
131 E16(ehdr->e_ehsize);
132 E16(ehdr->e_phentsize);
133 E16(ehdr->e_phnum);
134 E16(ehdr->e_shentsize);
135 E16(ehdr->e_shnum);
136 E16(ehdr->e_shstrndx);
137 #elif ELFSIZE == 64
138 E16(ehdr->e_type);
139 E16(ehdr->e_machine);
140 E32(ehdr->e_version);
141 E64(ehdr->e_entry);
142 E64(ehdr->e_phoff);
143 E64(ehdr->e_shoff);
144 E32(ehdr->e_flags);
145 E16(ehdr->e_ehsize);
146 E16(ehdr->e_phentsize);
147 E16(ehdr->e_phnum);
148 E16(ehdr->e_shentsize);
149 E16(ehdr->e_shnum);
150 E16(ehdr->e_shstrndx);
151 #else
152 #error ELFSIZE is not 32 or 64
153 #endif
154 }
155
156 static void
157 internalize_phdr(Elf_Byte bo, Elf_Phdr *phdr)
158 {
159
160 #if ELFSIZE == 32
161 I32(phdr->p_type);
162 I32(phdr->p_offset);
163 I32(phdr->p_vaddr);
164 I32(phdr->p_paddr);
165 I32(phdr->p_filesz);
166 I32(phdr->p_memsz);
167 I32(phdr->p_flags);
168 I32(phdr->p_align);
169 #elif ELFSIZE == 64
170 I32(phdr->p_type);
171 I32(phdr->p_offset);
172 I64(phdr->p_vaddr);
173 I64(phdr->p_paddr);
174 I64(phdr->p_filesz);
175 I64(phdr->p_memsz);
176 I64(phdr->p_flags);
177 I64(phdr->p_align);
178 #else
179 #error ELFSIZE is not 32 or 64
180 #endif
181 }
182
183 static void
184 internalize_shdr(Elf_Byte bo, Elf_Shdr *shdr)
185 {
186
187 #if ELFSIZE == 32
188 I32(shdr->sh_name);
189 I32(shdr->sh_type);
190 I32(shdr->sh_flags);
191 I32(shdr->sh_addr);
192 I32(shdr->sh_offset);
193 I32(shdr->sh_size);
194 I32(shdr->sh_link);
195 I32(shdr->sh_info);
196 I32(shdr->sh_addralign);
197 I32(shdr->sh_entsize);
198 #elif ELFSIZE == 64
199 I32(shdr->sh_name);
200 I32(shdr->sh_type);
201 I64(shdr->sh_flags);
202 I64(shdr->sh_addr);
203 I64(shdr->sh_offset);
204 I64(shdr->sh_size);
205 I32(shdr->sh_link);
206 I32(shdr->sh_info);
207 I64(shdr->sh_addralign);
208 I64(shdr->sh_entsize);
209 #else
210 #error ELFSIZE is not 32 or 64
211 #endif
212 }
213
214 static void
215 externalize_shdr(Elf_Byte bo, Elf_Shdr *shdr)
216 {
217
218 #if ELFSIZE == 32
219 E32(shdr->sh_name);
220 E32(shdr->sh_type);
221 E32(shdr->sh_flags);
222 E32(shdr->sh_addr);
223 E32(shdr->sh_offset);
224 E32(shdr->sh_size);
225 E32(shdr->sh_link);
226 E32(shdr->sh_info);
227 E32(shdr->sh_addralign);
228 E32(shdr->sh_entsize);
229 #elif ELFSIZE == 64
230 E32(shdr->sh_name);
231 E32(shdr->sh_type);
232 E64(shdr->sh_flags);
233 E64(shdr->sh_addr);
234 E64(shdr->sh_offset);
235 E64(shdr->sh_size);
236 E32(shdr->sh_link);
237 E32(shdr->sh_info);
238 E64(shdr->sh_addralign);
239 E64(shdr->sh_entsize);
240 #else
241 #error ELFSIZE is not 32 or 64
242 #endif
243 }
244 #else /* _STANDALONE */
245 /*
246 * Byte swapping is never necessary in the _STANDALONE case because
247 * we are being built with the target compiler.
248 */
249 #define internalize_ehdr(bo, ehdr) /* nothing */
250 #define externalize_ehdr(bo, ehdr) /* nothing */
251
252 #define internalize_phdr(bo, phdr) /* nothing */
253
254 #define internalize_shdr(bo, shdr) /* nothing */
255 #define externalize_shdr(bo, shdr) /* nothing */
256 #endif /* _STANDALONE */
257
258 int
259 ELFNAMEEND(loadfile)(int fd, Elf_Ehdr *elf, u_long *marks, int flags)
260 {
261 Elf_Shdr *shp;
262 Elf_Phdr *phdr;
263 int i, j;
264 ssize_t sz;
265 int first;
266 Elf_Addr shpp;
267 Elf_Addr minp = ~0, maxp = 0, pos = 0, elfp = 0;
268 u_long offset = marks[MARK_START];
269 ssize_t nr;
270 struct __packed {
271 Elf_Nhdr nh;
272 uint8_t name[ELF_NOTE_NETBSD_NAMESZ + 1];
273 uint8_t desc[ELF_NOTE_NETBSD_DESCSZ];
274 } note;
275 char *shstr = NULL;
276 int boot_load_ctf = 1;
277
278 /* some ports dont use the offset */
279 (void)&offset;
280
281 internalize_ehdr(elf->e_ident[EI_DATA], elf);
282
283 sz = elf->e_phnum * sizeof(Elf_Phdr);
284 phdr = ALLOC(sz);
285
286 if (lseek(fd, elf->e_phoff, SEEK_SET) == -1) {
287 WARN(("lseek phdr"));
288 goto freephdr;
289 }
290 nr = read(fd, phdr, sz);
291 if (nr == -1) {
292 WARN(("read program headers"));
293 goto freephdr;
294 }
295 if (nr != sz) {
296 errno = EIO;
297 WARN(("read program headers"));
298 goto freephdr;
299 }
300
301 for (first = 1, i = 0; i < elf->e_phnum; i++) {
302 internalize_phdr(elf->e_ident[EI_DATA], &phdr[i]);
303
304 #ifndef MD_LOADSEG /* Allow processor ABI specific segment loads */
305 #define MD_LOADSEG(a) /*CONSTCOND*/0
306 #endif
307 if (MD_LOADSEG(&phdr[i]))
308 goto loadseg;
309
310 if (phdr[i].p_type != PT_LOAD ||
311 (phdr[i].p_flags & (PF_W|PF_X)) == 0)
312 continue;
313
314 #define IS_TEXT(p) (p.p_flags & PF_X)
315 #define IS_DATA(p) (p.p_flags & PF_W)
316 #define IS_BSS(p) (p.p_filesz < p.p_memsz)
317 /*
318 * XXX: Assume first address is lowest
319 */
320 if ((IS_TEXT(phdr[i]) && (flags & LOAD_TEXT)) ||
321 (IS_DATA(phdr[i]) && (flags & LOAD_DATA))) {
322
323 loadseg:
324 if (marks[MARK_DATA] == 0 && IS_DATA(phdr[i]))
325 marks[MARK_DATA] = LOADADDR(phdr[i].p_vaddr);
326
327 /* Read in segment. */
328 PROGRESS(("%s%lu", first ? "" : "+",
329 (u_long)phdr[i].p_filesz));
330
331 if (lseek(fd, phdr[i].p_offset, SEEK_SET) == -1) {
332 WARN(("lseek text"));
333 goto freephdr;
334 }
335 nr = READ(fd, phdr[i].p_vaddr, phdr[i].p_filesz);
336 if (nr == -1) {
337 WARN(("read text error"));
338 goto freephdr;
339 }
340 if (nr != (ssize_t)phdr[i].p_filesz) {
341 errno = EIO;
342 WARN(("read text"));
343 goto freephdr;
344 }
345 first = 0;
346
347 }
348 if ((IS_TEXT(phdr[i]) && (flags & (LOAD_TEXT|COUNT_TEXT))) ||
349 (IS_DATA(phdr[i]) && (flags & (LOAD_DATA|COUNT_TEXT)))) {
350 pos = phdr[i].p_vaddr;
351 if (minp > pos)
352 minp = pos;
353 pos += phdr[i].p_filesz;
354 if (maxp < pos)
355 maxp = pos;
356 }
357
358 /* Zero out bss. */
359 if (IS_BSS(phdr[i]) && (flags & LOAD_BSS)) {
360 PROGRESS(("+%lu",
361 (u_long)(phdr[i].p_memsz - phdr[i].p_filesz)));
362 BZERO((phdr[i].p_vaddr + phdr[i].p_filesz),
363 phdr[i].p_memsz - phdr[i].p_filesz);
364 }
365 if (IS_BSS(phdr[i]) && (flags & (LOAD_BSS|COUNT_BSS))) {
366 pos += phdr[i].p_memsz - phdr[i].p_filesz;
367 if (maxp < pos)
368 maxp = pos;
369 }
370 }
371 DEALLOC(phdr, sz);
372
373 /*
374 * Copy the ELF and section headers.
375 */
376 maxp = roundup(maxp, ELFROUND);
377 if (flags & (LOAD_HDR|COUNT_HDR)) {
378 elfp = maxp;
379 maxp += sizeof(Elf_Ehdr);
380 }
381
382 if (flags & (LOAD_SYM|COUNT_SYM)) {
383 if (lseek(fd, elf->e_shoff, SEEK_SET) == -1) {
384 WARN(("lseek section headers"));
385 return 1;
386 }
387 sz = elf->e_shnum * sizeof(Elf_Shdr);
388
389 shp = ALLOC(sz);
390
391 nr = read(fd, shp, sz);
392 if (nr == -1) {
393 WARN(("read section headers"));
394 goto freeshp;
395 }
396 if (nr != sz) {
397 errno = EIO;
398 WARN(("read section headers"));
399 goto freeshp;
400 }
401
402 shpp = maxp;
403 maxp += roundup(sz, ELFROUND);
404
405 #ifndef _STANDALONE
406 /* Internalize the section headers. */
407 for (i = 0; i < elf->e_shnum; i++)
408 internalize_shdr(elf->e_ident[EI_DATA], &shp[i]);
409 #endif /* ! _STANDALONE */
410
411 /*
412 * First load the section names section.
413 */
414 if (boot_load_ctf && (elf->e_shstrndx != 0)) {
415 if (flags & LOAD_SYM) {
416 if (lseek(fd, shp[elf->e_shstrndx].sh_offset,
417 SEEK_SET) == -1) {
418 WARN(("lseek symbols"));
419 goto freeshp;
420 }
421 nr = READ(fd, maxp,
422 shp[elf->e_shstrndx].sh_size);
423 if (nr == -1) {
424 WARN(("read symbols"));
425 goto freeshp;
426 }
427 if (nr !=
428 (ssize_t)shp[elf->e_shstrndx].sh_size) {
429 errno = EIO;
430 WARN(("read symbols"));
431 goto freeshp;
432 }
433
434 shstr = ALLOC(shp[elf->e_shstrndx].sh_size);
435 if (lseek(fd, shp[elf->e_shstrndx].sh_offset,
436 SEEK_SET) == -1) {
437 WARN(("lseek symbols"));
438 goto freeshp;
439 }
440 nr = read(fd, shstr,
441 shp[elf->e_shstrndx].sh_size);
442 if (nr == -1) {
443 WARN(("read symbols"));
444 goto freeshp;
445 }
446 }
447 shp[elf->e_shstrndx].sh_offset = maxp - elfp;
448 maxp += roundup(shp[elf->e_shstrndx].sh_size, ELFROUND);
449 }
450
451 /*
452 * Now load the symbol sections themselves. Make sure
453 * the sections are aligned. Don't bother with any
454 * string table that isn't referenced by a symbol
455 * table.
456 */
457 for (first = 1, i = 0; i < elf->e_shnum; i++) {
458 if (i == elf->e_shstrndx) {
459 /* already loaded this section */
460 continue;
461 }
462 switch (shp[i].sh_type) {
463 case SHT_PROGBITS:
464 if (boot_load_ctf && shstr) {
465 /* got a CTF section? */
466 if (strncmp(".SUNW_ctf",
467 &shstr[shp[i].sh_name],
468 10) == 0) {
469 goto havesym;
470 }
471 }
472
473 /* Not loading this, so zero out the offset. */
474 shp[i].sh_offset = 0;
475 break;
476 case SHT_STRTAB:
477 for (j = 0; j < elf->e_shnum; j++)
478 if (shp[j].sh_type == SHT_SYMTAB &&
479 shp[j].sh_link == (unsigned int)i)
480 goto havesym;
481 /* FALLTHROUGH */
482 default:
483 /* Not loading this, so zero out the offset. */
484 shp[i].sh_offset = 0;
485 break;
486 havesym:
487 case SHT_SYMTAB:
488 if (flags & LOAD_SYM) {
489 PROGRESS(("%s%ld", first ? " [" : "+",
490 (u_long)shp[i].sh_size));
491 if (lseek(fd, shp[i].sh_offset,
492 SEEK_SET) == -1) {
493 WARN(("lseek symbols"));
494 goto freeshp;
495 }
496 nr = READ(fd, maxp, shp[i].sh_size);
497 if (nr == -1) {
498 WARN(("read symbols"));
499 goto freeshp;
500 }
501 if (nr != (ssize_t)shp[i].sh_size) {
502 errno = EIO;
503 WARN(("read symbols"));
504 goto freeshp;
505 }
506 }
507 shp[i].sh_offset = maxp - elfp;
508 maxp += roundup(shp[i].sh_size, ELFROUND);
509 first = 0;
510 break;
511 case SHT_NOTE:
512 if ((flags & LOAD_NOTE) == 0)
513 break;
514 if (shp[i].sh_size < sizeof(note)) {
515 shp[i].sh_offset = 0;
516 break;
517 }
518 if (lseek(fd, shp[i].sh_offset, SEEK_SET)
519 == -1) {
520 WARN(("lseek note"));
521 goto freeshp;
522 }
523 nr = read(fd, &note, sizeof(note));
524 if (nr == -1) {
525 WARN(("read note"));
526 goto freeshp;
527 }
528 if (note.nh.n_namesz ==
529 ELF_NOTE_NETBSD_NAMESZ &&
530 note.nh.n_descsz ==
531 ELF_NOTE_NETBSD_DESCSZ &&
532 note.nh.n_type ==
533 ELF_NOTE_TYPE_NETBSD_TAG &&
534 memcmp(note.name, ELF_NOTE_NETBSD_NAME,
535 sizeof(note.name)) == 0) {
536 memcpy(&netbsd_version, &note.desc,
537 sizeof(netbsd_version));
538 }
539 shp[i].sh_offset = 0;
540 break;
541 }
542 }
543 if (flags & LOAD_SYM) {
544 #ifndef _STANDALONE
545 /* Externalize the section headers. */
546 for (i = 0; i < elf->e_shnum; i++)
547 externalize_shdr(elf->e_ident[EI_DATA],
548 &shp[i]);
549 #endif /* ! _STANDALONE */
550 BCOPY(shp, shpp, sz);
551
552 if (first == 0)
553 PROGRESS(("]"));
554 }
555 DEALLOC(shp, sz);
556 }
557
558 if (shstr) {
559 DEALLOC(shstr, shp[elf->e_shstrndx].sh_size);
560 }
561
562 /*
563 * Frob the copied ELF header to give information relative
564 * to elfp.
565 */
566 if (flags & LOAD_HDR) {
567 elf->e_phoff = 0;
568 elf->e_shoff = sizeof(Elf_Ehdr);
569 elf->e_phentsize = 0;
570 elf->e_phnum = 0;
571 externalize_ehdr(elf->e_ident[EI_DATA], elf);
572 BCOPY(elf, elfp, sizeof(*elf));
573 internalize_ehdr(elf->e_ident[EI_DATA], elf);
574 }
575
576 marks[MARK_START] = LOADADDR(minp);
577 marks[MARK_ENTRY] = LOADADDR(elf->e_entry);
578 /*
579 * Since there can be more than one symbol section in the code
580 * and we need to find strtab too in order to do anything
581 * useful with the symbols, we just pass the whole elf
582 * header back and we let the kernel debugger find the
583 * location and number of symbols by itself.
584 */
585 marks[MARK_NSYM] = 1; /* XXX: Kernel needs >= 0 */
586 marks[MARK_SYM] = LOADADDR(elfp);
587 marks[MARK_END] = LOADADDR(maxp);
588 return 0;
589 freephdr:
590 DEALLOC(phdr, sz);
591 return 1;
592 freeshp:
593 DEALLOC(shp, sz);
594 return 1;
595 }
596
597 #ifdef TEST
598 #include <stdlib.h>
599 #include <fcntl.h>
600 #include <err.h>
601 #include <stdio.h>
602 u_int32_t netbsd_version;
603 int
604 main(int argc, char *argv[])
605 {
606 int fd;
607 u_long marks[MARK_MAX];
608 Elf_Ehdr elf;
609 if (argc != 2) {
610 (void)fprintf(stderr, "Usage: %s <file>\n", getprogname());
611 return 1;
612 }
613 if ((fd = open(argv[1], O_RDONLY)) == -1)
614 err(1, "Can't open `%s'", argv[1]);
615 if (read(fd, &elf, sizeof(elf)) != sizeof(elf))
616 err(1, "Can't read `%s'", argv[1]);
617 memset(marks, 0, sizeof(marks));
618 marks[MARK_START] = (u_long)malloc(2LL * 1024 * 2024 * 1024);
619 ELFNAMEEND(loadfile)(fd, &elf, marks, LOAD_ALL);
620 printf("%d\n", netbsd_version);
621 return 0;
622 }
623 #endif
624
625 #endif /* (ELFSIZE == 32 && BOOT_ELF32) || (ELFSIZE == 64 && BOOT_ELF64) */
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