1 /*-
2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
3 * Copyright (c) 1998 Peter Wemm <peter@freebsd.org>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD: src/sys/boot/common/load_elf.c,v 1.39 2008/10/14 10:11:14 raj Exp $");
30
31 #include <sys/param.h>
32 #include <sys/exec.h>
33 #include <sys/linker.h>
34 #include <sys/module.h>
35 #include <sys/stdint.h>
36 #include <string.h>
37 #include <machine/elf.h>
38 #include <stand.h>
39 #define FREEBSD_ELF
40 #include <link.h>
41
42 #include "bootstrap.h"
43
44 #define COPYOUT(s,d,l) archsw.arch_copyout((vm_offset_t)(s), d, l)
45
46 #if defined(__i386__) && __ELF_WORD_SIZE == 64
47 #undef ELF_TARG_CLASS
48 #undef ELF_TARG_MACH
49 #define ELF_TARG_CLASS ELFCLASS64
50 #define ELF_TARG_MACH EM_X86_64
51 #endif
52
53 typedef struct elf_file {
54 Elf_Phdr *ph;
55 Elf_Ehdr *ehdr;
56 Elf_Sym *symtab;
57 Elf_Hashelt *hashtab;
58 Elf_Hashelt nbuckets;
59 Elf_Hashelt nchains;
60 Elf_Hashelt *buckets;
61 Elf_Hashelt *chains;
62 Elf_Rel *rel;
63 size_t relsz;
64 Elf_Rela *rela;
65 size_t relasz;
66 char *strtab;
67 size_t strsz;
68 int fd;
69 caddr_t firstpage;
70 size_t firstlen;
71 int kernel;
72 u_int64_t off;
73 } *elf_file_t;
74
75 static int __elfN(loadimage)(struct preloaded_file *mp, elf_file_t ef, u_int64_t loadaddr);
76 static int __elfN(lookup_symbol)(struct preloaded_file *mp, elf_file_t ef, const char* name, Elf_Sym* sym);
77 static int __elfN(reloc_ptr)(struct preloaded_file *mp, elf_file_t ef,
78 Elf_Addr p, void *val, size_t len);
79 static int __elfN(parse_modmetadata)(struct preloaded_file *mp, elf_file_t ef);
80 static symaddr_fn __elfN(symaddr);
81 static char *fake_modname(const char *name);
82
83 const char *__elfN(kerneltype) = "elf kernel";
84 const char *__elfN(moduletype) = "elf module";
85
86 u_int64_t __elfN(relocation_offset) = 0;
87
88 /*
89 * Attempt to load the file (file) as an ELF module. It will be stored at
90 * (dest), and a pointer to a module structure describing the loaded object
91 * will be saved in (result).
92 */
93 int
94 __elfN(loadfile)(char *filename, u_int64_t dest, struct preloaded_file **result)
95 {
96 struct preloaded_file *fp, *kfp;
97 struct elf_file ef;
98 Elf_Ehdr *ehdr;
99 int err;
100 u_int pad;
101 ssize_t bytes_read;
102
103 fp = NULL;
104 bzero(&ef, sizeof(struct elf_file));
105
106 /*
107 * Open the image, read and validate the ELF header
108 */
109 if (filename == NULL) /* can't handle nameless */
110 return(EFTYPE);
111 if ((ef.fd = open(filename, O_RDONLY)) == -1)
112 return(errno);
113 ef.firstpage = malloc(PAGE_SIZE);
114 if (ef.firstpage == NULL) {
115 close(ef.fd);
116 return(ENOMEM);
117 }
118 bytes_read = read(ef.fd, ef.firstpage, PAGE_SIZE);
119 ef.firstlen = (size_t)bytes_read;
120 if (bytes_read < 0 || ef.firstlen <= sizeof(Elf_Ehdr)) {
121 err = EFTYPE; /* could be EIO, but may be small file */
122 goto oerr;
123 }
124 ehdr = ef.ehdr = (Elf_Ehdr *)ef.firstpage;
125
126 /* Is it ELF? */
127 if (!IS_ELF(*ehdr)) {
128 err = EFTYPE;
129 goto oerr;
130 }
131 if (ehdr->e_ident[EI_CLASS] != ELF_TARG_CLASS || /* Layout ? */
132 ehdr->e_ident[EI_DATA] != ELF_TARG_DATA ||
133 ehdr->e_ident[EI_VERSION] != EV_CURRENT || /* Version ? */
134 ehdr->e_version != EV_CURRENT ||
135 ehdr->e_machine != ELF_TARG_MACH) { /* Machine ? */
136 err = EFTYPE;
137 goto oerr;
138 }
139
140
141 /*
142 * Check to see what sort of module we are.
143 */
144 kfp = file_findfile(NULL, NULL);
145 if (ehdr->e_type == ET_DYN) {
146 /* Looks like a kld module */
147 if (kfp == NULL) {
148 printf("elf" __XSTRING(__ELF_WORD_SIZE) "_loadfile: can't load module before kernel\n");
149 err = EPERM;
150 goto oerr;
151 }
152 if (strcmp(__elfN(kerneltype), kfp->f_type)) {
153 printf("elf" __XSTRING(__ELF_WORD_SIZE) "_loadfile: can't load module with kernel type '%s'\n", kfp->f_type);
154 err = EPERM;
155 goto oerr;
156 }
157 /* Looks OK, got ahead */
158 ef.kernel = 0;
159
160 /* Page-align the load address */
161 pad = (u_int)dest & PAGE_MASK;
162 if (pad != 0) {
163 pad = PAGE_SIZE - pad;
164 dest += pad;
165 }
166 } else if (ehdr->e_type == ET_EXEC) {
167 /* Looks like a kernel */
168 if (kfp != NULL) {
169 printf("elf" __XSTRING(__ELF_WORD_SIZE) "_loadfile: kernel already loaded\n");
170 err = EPERM;
171 goto oerr;
172 }
173 /*
174 * Calculate destination address based on kernel entrypoint
175 */
176 dest = ehdr->e_entry;
177 if (dest == 0) {
178 printf("elf" __XSTRING(__ELF_WORD_SIZE) "_loadfile: not a kernel (maybe static binary?)\n");
179 err = EPERM;
180 goto oerr;
181 }
182 ef.kernel = 1;
183
184 } else {
185 err = EFTYPE;
186 goto oerr;
187 }
188
189 /*
190 * Ok, we think we should handle this.
191 */
192 fp = file_alloc();
193 if (fp == NULL) {
194 printf("elf" __XSTRING(__ELF_WORD_SIZE) "_loadfile: cannot allocate module info\n");
195 err = EPERM;
196 goto out;
197 }
198 if (ef.kernel)
199 setenv("kernelname", filename, 1);
200 fp->f_name = strdup(filename);
201 fp->f_type = strdup(ef.kernel ? __elfN(kerneltype) : __elfN(moduletype));
202
203 #ifdef ELF_VERBOSE
204 if (ef.kernel)
205 printf("%s entry at 0x%jx\n", filename, (uintmax_t)dest);
206 #else
207 printf("%s ", filename);
208 #endif
209
210 fp->f_size = __elfN(loadimage)(fp, &ef, dest);
211 if (fp->f_size == 0 || fp->f_addr == 0)
212 goto ioerr;
213
214 /* save exec header as metadata */
215 file_addmetadata(fp, MODINFOMD_ELFHDR, sizeof(*ehdr), ehdr);
216
217 /* Load OK, return module pointer */
218 *result = (struct preloaded_file *)fp;
219 err = 0;
220 goto out;
221
222 ioerr:
223 err = EIO;
224 oerr:
225 file_discard(fp);
226 out:
227 if (ef.firstpage)
228 free(ef.firstpage);
229 close(ef.fd);
230 return(err);
231 }
232
233 /*
234 * With the file (fd) open on the image, and (ehdr) containing
235 * the Elf header, load the image at (off)
236 */
237 static int
238 __elfN(loadimage)(struct preloaded_file *fp, elf_file_t ef, u_int64_t off)
239 {
240 int i;
241 u_int j;
242 Elf_Ehdr *ehdr;
243 Elf_Phdr *phdr, *php;
244 Elf_Shdr *shdr;
245 int ret;
246 vm_offset_t firstaddr;
247 vm_offset_t lastaddr;
248 size_t chunk;
249 ssize_t result;
250 Elf_Addr ssym, esym;
251 Elf_Dyn *dp;
252 Elf_Addr adp;
253 int ndp;
254 int symstrindex;
255 int symtabindex;
256 Elf_Size size;
257 u_int fpcopy;
258
259 dp = NULL;
260 shdr = NULL;
261 ret = 0;
262 firstaddr = lastaddr = 0;
263 ehdr = ef->ehdr;
264 if (ef->kernel) {
265 #ifdef __i386__
266 #if __ELF_WORD_SIZE == 64
267 off = - (off & 0xffffffffff000000ull);/* x86_64 relocates after locore */
268 #else
269 off = - (off & 0xff000000u); /* i386 relocates after locore */
270 #endif
271 #elif defined(__powerpc__)
272 /*
273 * On the purely virtual memory machines like e500, the kernel is
274 * linked against its final VA range, which is most often not
275 * available at the loader stage, but only after kernel initializes
276 * and completes its VM settings. In such cases we cannot use p_vaddr
277 * field directly to load ELF segments, but put them at some
278 * 'load-time' locations.
279 */
280 if (off & 0xf0000000u) {
281 off = -(off & 0xf0000000u);
282 /*
283 * XXX the physical load address should not be hardcoded. Note
284 * that the Book-E kernel assumes that it's loaded at a 16MB
285 * boundary for now...
286 */
287 off += 0x01000000;
288 ehdr->e_entry += off;
289 #ifdef ELF_VERBOSE
290 printf("Converted entry 0x%08x\n", ehdr->e_entry);
291 #endif
292 } else
293 off = 0;
294 #elif defined(__arm__)
295 if (off & 0xf0000000u) {
296 off = -(off & 0xf0000000u);
297 ehdr->e_entry += off;
298 #ifdef ELF_VERBOSE
299 printf("Converted entry 0x%08x\n", ehdr->e_entry);
300 #endif
301 } else
302 off = 0;
303 #else
304 off = 0; /* other archs use direct mapped kernels */
305 #endif
306 __elfN(relocation_offset) = off;
307 }
308 ef->off = off;
309
310 if ((ehdr->e_phoff + ehdr->e_phnum * sizeof(*phdr)) > ef->firstlen) {
311 printf("elf" __XSTRING(__ELF_WORD_SIZE) "_loadimage: program header not within first page\n");
312 goto out;
313 }
314 phdr = (Elf_Phdr *)(ef->firstpage + ehdr->e_phoff);
315
316 for (i = 0; i < ehdr->e_phnum; i++) {
317 /* We want to load PT_LOAD segments only.. */
318 if (phdr[i].p_type != PT_LOAD)
319 continue;
320
321 #ifdef ELF_VERBOSE
322 printf("Segment: 0x%lx@0x%lx -> 0x%lx-0x%lx",
323 (long)phdr[i].p_filesz, (long)phdr[i].p_offset,
324 (long)(phdr[i].p_vaddr + off),
325 (long)(phdr[i].p_vaddr + off + phdr[i].p_memsz - 1));
326 #else
327 if ((phdr[i].p_flags & PF_W) == 0) {
328 printf("text=0x%lx ", (long)phdr[i].p_filesz);
329 } else {
330 printf("data=0x%lx", (long)phdr[i].p_filesz);
331 if (phdr[i].p_filesz < phdr[i].p_memsz)
332 printf("+0x%lx", (long)(phdr[i].p_memsz -phdr[i].p_filesz));
333 printf(" ");
334 }
335 #endif
336 fpcopy = 0;
337 if (ef->firstlen > phdr[i].p_offset) {
338 fpcopy = ef->firstlen - phdr[i].p_offset;
339 archsw.arch_copyin(ef->firstpage + phdr[i].p_offset,
340 phdr[i].p_vaddr + off, fpcopy);
341 }
342 if (phdr[i].p_filesz > fpcopy) {
343 if (kern_pread(ef->fd, phdr[i].p_vaddr + off + fpcopy,
344 phdr[i].p_filesz - fpcopy, phdr[i].p_offset + fpcopy) != 0) {
345 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
346 "_loadimage: read failed\n");
347 goto out;
348 }
349 }
350 /* clear space from oversized segments; eg: bss */
351 if (phdr[i].p_filesz < phdr[i].p_memsz) {
352 #ifdef ELF_VERBOSE
353 printf(" (bss: 0x%lx-0x%lx)",
354 (long)(phdr[i].p_vaddr + off + phdr[i].p_filesz),
355 (long)(phdr[i].p_vaddr + off + phdr[i].p_memsz - 1));
356 #endif
357
358 kern_bzero(phdr[i].p_vaddr + off + phdr[i].p_filesz,
359 phdr[i].p_memsz - phdr[i].p_filesz);
360 }
361 #ifdef ELF_VERBOSE
362 printf("\n");
363 #endif
364
365 if (firstaddr == 0 || firstaddr > (phdr[i].p_vaddr + off))
366 firstaddr = phdr[i].p_vaddr + off;
367 if (lastaddr == 0 || lastaddr < (phdr[i].p_vaddr + off + phdr[i].p_memsz))
368 lastaddr = phdr[i].p_vaddr + off + phdr[i].p_memsz;
369 }
370 lastaddr = roundup(lastaddr, sizeof(long));
371
372 /*
373 * Now grab the symbol tables. This isn't easy if we're reading a
374 * .gz file. I think the rule is going to have to be that you must
375 * strip a file to remove symbols before gzipping it so that we do not
376 * try to lseek() on it.
377 */
378 chunk = ehdr->e_shnum * ehdr->e_shentsize;
379 if (chunk == 0 || ehdr->e_shoff == 0)
380 goto nosyms;
381 shdr = alloc_pread(ef->fd, ehdr->e_shoff, chunk);
382 if (shdr == NULL) {
383 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
384 "_loadimage: failed to read section headers");
385 goto nosyms;
386 }
387 symtabindex = -1;
388 symstrindex = -1;
389 for (i = 0; i < ehdr->e_shnum; i++) {
390 if (shdr[i].sh_type != SHT_SYMTAB)
391 continue;
392 for (j = 0; j < ehdr->e_phnum; j++) {
393 if (phdr[j].p_type != PT_LOAD)
394 continue;
395 if (shdr[i].sh_offset >= phdr[j].p_offset &&
396 (shdr[i].sh_offset + shdr[i].sh_size <=
397 phdr[j].p_offset + phdr[j].p_filesz)) {
398 shdr[i].sh_offset = 0;
399 shdr[i].sh_size = 0;
400 break;
401 }
402 }
403 if (shdr[i].sh_offset == 0 || shdr[i].sh_size == 0)
404 continue; /* alread loaded in a PT_LOAD above */
405 /* Save it for loading below */
406 symtabindex = i;
407 symstrindex = shdr[i].sh_link;
408 }
409 if (symtabindex < 0 || symstrindex < 0)
410 goto nosyms;
411
412 /* Ok, committed to a load. */
413 #ifndef ELF_VERBOSE
414 printf("syms=[");
415 #endif
416 ssym = lastaddr;
417 for (i = symtabindex; i >= 0; i = symstrindex) {
418 #ifdef ELF_VERBOSE
419 char *secname;
420
421 switch(shdr[i].sh_type) {
422 case SHT_SYMTAB: /* Symbol table */
423 secname = "symtab";
424 break;
425 case SHT_STRTAB: /* String table */
426 secname = "strtab";
427 break;
428 default:
429 secname = "WHOA!!";
430 break;
431 }
432 #endif
433
434 size = shdr[i].sh_size;
435 archsw.arch_copyin(&size, lastaddr, sizeof(size));
436 lastaddr += sizeof(size);
437
438 #ifdef ELF_VERBOSE
439 printf("\n%s: 0x%jx@0x%jx -> 0x%jx-0x%jx", secname,
440 (uintmax_t)shdr[i].sh_size, (uintmax_t)shdr[i].sh_offset,
441 (uintmax_t)lastaddr, (uintmax_t)(lastaddr + shdr[i].sh_size));
442 #else
443 if (i == symstrindex)
444 printf("+");
445 printf("0x%lx+0x%lx", (long)sizeof(size), (long)size);
446 #endif
447
448 if (lseek(ef->fd, (off_t)shdr[i].sh_offset, SEEK_SET) == -1) {
449 printf("\nelf" __XSTRING(__ELF_WORD_SIZE) "_loadimage: could not seek for symbols - skipped!");
450 lastaddr = ssym;
451 ssym = 0;
452 goto nosyms;
453 }
454 result = archsw.arch_readin(ef->fd, lastaddr, shdr[i].sh_size);
455 if (result < 0 || (size_t)result != shdr[i].sh_size) {
456 printf("\nelf" __XSTRING(__ELF_WORD_SIZE) "_loadimage: could not read symbols - skipped!");
457 lastaddr = ssym;
458 ssym = 0;
459 goto nosyms;
460 }
461 /* Reset offsets relative to ssym */
462 lastaddr += shdr[i].sh_size;
463 lastaddr = roundup(lastaddr, sizeof(size));
464 if (i == symtabindex)
465 symtabindex = -1;
466 else if (i == symstrindex)
467 symstrindex = -1;
468 }
469 esym = lastaddr;
470 #ifndef ELF_VERBOSE
471 printf("]");
472 #endif
473
474 file_addmetadata(fp, MODINFOMD_SSYM, sizeof(ssym), &ssym);
475 file_addmetadata(fp, MODINFOMD_ESYM, sizeof(esym), &esym);
476
477 nosyms:
478 printf("\n");
479
480 ret = lastaddr - firstaddr;
481 fp->f_addr = firstaddr;
482
483 php = NULL;
484 for (i = 0; i < ehdr->e_phnum; i++) {
485 if (phdr[i].p_type == PT_DYNAMIC) {
486 php = phdr + i;
487 adp = php->p_vaddr;
488 file_addmetadata(fp, MODINFOMD_DYNAMIC, sizeof(adp), &adp);
489 break;
490 }
491 }
492
493 if (php == NULL) /* this is bad, we cannot get to symbols or _DYNAMIC */
494 goto out;
495
496 ndp = php->p_filesz / sizeof(Elf_Dyn);
497 if (ndp == 0)
498 goto out;
499 dp = malloc(php->p_filesz);
500 if (dp == NULL)
501 goto out;
502 archsw.arch_copyout(php->p_vaddr + off, dp, php->p_filesz);
503
504 ef->strsz = 0;
505 for (i = 0; i < ndp; i++) {
506 if (dp[i].d_tag == 0)
507 break;
508 switch (dp[i].d_tag) {
509 case DT_HASH:
510 ef->hashtab = (Elf_Hashelt*)(uintptr_t)(dp[i].d_un.d_ptr + off);
511 break;
512 case DT_STRTAB:
513 ef->strtab = (char *)(uintptr_t)(dp[i].d_un.d_ptr + off);
514 break;
515 case DT_STRSZ:
516 ef->strsz = dp[i].d_un.d_val;
517 break;
518 case DT_SYMTAB:
519 ef->symtab = (Elf_Sym*)(uintptr_t)(dp[i].d_un.d_ptr + off);
520 break;
521 case DT_REL:
522 ef->rel = (Elf_Rel *)(uintptr_t)(dp[i].d_un.d_ptr + off);
523 break;
524 case DT_RELSZ:
525 ef->relsz = dp[i].d_un.d_val;
526 break;
527 case DT_RELA:
528 ef->rela = (Elf_Rela *)(uintptr_t)(dp[i].d_un.d_ptr + off);
529 break;
530 case DT_RELASZ:
531 ef->relasz = dp[i].d_un.d_val;
532 break;
533 default:
534 break;
535 }
536 }
537 if (ef->hashtab == NULL || ef->symtab == NULL ||
538 ef->strtab == NULL || ef->strsz == 0)
539 goto out;
540 COPYOUT(ef->hashtab, &ef->nbuckets, sizeof(ef->nbuckets));
541 COPYOUT(ef->hashtab + 1, &ef->nchains, sizeof(ef->nchains));
542 ef->buckets = ef->hashtab + 2;
543 ef->chains = ef->buckets + ef->nbuckets;
544 if (__elfN(parse_modmetadata)(fp, ef) == 0)
545 goto out;
546
547 if (ef->kernel) /* kernel must not depend on anything */
548 goto out;
549
550 out:
551 if (dp)
552 free(dp);
553 if (shdr)
554 free(shdr);
555 return ret;
556 }
557
558 static char invalid_name[] = "bad";
559
560 char *
561 fake_modname(const char *name)
562 {
563 const char *sp, *ep;
564 char *fp;
565 size_t len;
566
567 sp = strrchr(name, '/');
568 if (sp)
569 sp++;
570 else
571 sp = name;
572 ep = strrchr(name, '.');
573 if (ep) {
574 if (ep == name) {
575 sp = invalid_name;
576 ep = invalid_name + sizeof(invalid_name) - 1;
577 }
578 } else
579 ep = name + strlen(name);
580 len = ep - sp;
581 fp = malloc(len + 1);
582 if (fp == NULL)
583 return NULL;
584 memcpy(fp, sp, len);
585 fp[len] = '\0';
586 return fp;
587 }
588
589 #if defined(__i386__) && __ELF_WORD_SIZE == 64
590 struct mod_metadata64 {
591 int md_version; /* structure version MDTV_* */
592 int md_type; /* type of entry MDT_* */
593 u_int64_t md_data; /* specific data */
594 u_int64_t md_cval; /* common string label */
595 };
596 #endif
597
598 int
599 __elfN(parse_modmetadata)(struct preloaded_file *fp, elf_file_t ef)
600 {
601 struct mod_metadata md;
602 #if defined(__i386__) && __ELF_WORD_SIZE == 64
603 struct mod_metadata64 md64;
604 #endif
605 struct mod_depend *mdepend;
606 struct mod_version mver;
607 Elf_Sym sym;
608 char *s;
609 int error, modcnt, minfolen;
610 Elf_Addr v, p, p_stop;
611
612 if (__elfN(lookup_symbol)(fp, ef, "__start_set_modmetadata_set", &sym) != 0)
613 return ENOENT;
614 p = sym.st_value + ef->off;
615 if (__elfN(lookup_symbol)(fp, ef, "__stop_set_modmetadata_set", &sym) != 0)
616 return ENOENT;
617 p_stop = sym.st_value + ef->off;
618
619 modcnt = 0;
620 while (p < p_stop) {
621 COPYOUT(p, &v, sizeof(v));
622 error = __elfN(reloc_ptr)(fp, ef, p, &v, sizeof(v));
623 if (error == EOPNOTSUPP)
624 v += ef->off;
625 else if (error != 0)
626 return (error);
627 #if defined(__i386__) && __ELF_WORD_SIZE == 64
628 COPYOUT(v, &md64, sizeof(md64));
629 error = __elfN(reloc_ptr)(fp, ef, v, &md64, sizeof(md64));
630 if (error == EOPNOTSUPP) {
631 md64.md_cval += ef->off;
632 md64.md_data += ef->off;
633 } else if (error != 0)
634 return (error);
635 md.md_version = md64.md_version;
636 md.md_type = md64.md_type;
637 md.md_cval = (const char *)(uintptr_t)md64.md_cval;
638 md.md_data = (void *)(uintptr_t)md64.md_data;
639 #else
640 COPYOUT(v, &md, sizeof(md));
641 error = __elfN(reloc_ptr)(fp, ef, v, &md, sizeof(md));
642 if (error == EOPNOTSUPP) {
643 md.md_cval += ef->off;
644 md.md_data += ef->off;
645 } else if (error != 0)
646 return (error);
647 #endif
648 p += sizeof(Elf_Addr);
649 switch(md.md_type) {
650 case MDT_DEPEND:
651 if (ef->kernel) /* kernel must not depend on anything */
652 break;
653 s = strdupout((vm_offset_t)md.md_cval);
654 minfolen = sizeof(*mdepend) + strlen(s) + 1;
655 mdepend = malloc(minfolen);
656 if (mdepend == NULL)
657 return ENOMEM;
658 COPYOUT((vm_offset_t)md.md_data, mdepend, sizeof(*mdepend));
659 strcpy((char*)(mdepend + 1), s);
660 free(s);
661 file_addmetadata(fp, MODINFOMD_DEPLIST, minfolen, mdepend);
662 free(mdepend);
663 break;
664 case MDT_VERSION:
665 s = strdupout((vm_offset_t)md.md_cval);
666 COPYOUT((vm_offset_t)md.md_data, &mver, sizeof(mver));
667 file_addmodule(fp, s, mver.mv_version, NULL);
668 free(s);
669 modcnt++;
670 break;
671 }
672 }
673 if (modcnt == 0) {
674 s = fake_modname(fp->f_name);
675 file_addmodule(fp, s, 1, NULL);
676 free(s);
677 }
678 return 0;
679 }
680
681 static unsigned long
682 elf_hash(const char *name)
683 {
684 const unsigned char *p = (const unsigned char *) name;
685 unsigned long h = 0;
686 unsigned long g;
687
688 while (*p != '\0') {
689 h = (h << 4) + *p++;
690 if ((g = h & 0xf0000000) != 0)
691 h ^= g >> 24;
692 h &= ~g;
693 }
694 return h;
695 }
696
697 static const char __elfN(bad_symtable)[] = "elf" __XSTRING(__ELF_WORD_SIZE) "_lookup_symbol: corrupt symbol table\n";
698 int
699 __elfN(lookup_symbol)(struct preloaded_file *fp, elf_file_t ef, const char* name,
700 Elf_Sym *symp)
701 {
702 Elf_Hashelt symnum;
703 Elf_Sym sym;
704 char *strp;
705 unsigned long hash;
706
707 hash = elf_hash(name);
708 COPYOUT(&ef->buckets[hash % ef->nbuckets], &symnum, sizeof(symnum));
709
710 while (symnum != STN_UNDEF) {
711 if (symnum >= ef->nchains) {
712 printf(__elfN(bad_symtable));
713 return ENOENT;
714 }
715
716 COPYOUT(ef->symtab + symnum, &sym, sizeof(sym));
717 if (sym.st_name == 0) {
718 printf(__elfN(bad_symtable));
719 return ENOENT;
720 }
721
722 strp = strdupout((vm_offset_t)(ef->strtab + sym.st_name));
723 if (strcmp(name, strp) == 0) {
724 free(strp);
725 if (sym.st_shndx != SHN_UNDEF ||
726 (sym.st_value != 0 &&
727 ELF_ST_TYPE(sym.st_info) == STT_FUNC)) {
728 *symp = sym;
729 return 0;
730 }
731 return ENOENT;
732 }
733 free(strp);
734 COPYOUT(&ef->chains[symnum], &symnum, sizeof(symnum));
735 }
736 return ENOENT;
737 }
738
739 /*
740 * Apply any intra-module relocations to the value. p is the load address
741 * of the value and val/len is the value to be modified. This does NOT modify
742 * the image in-place, because this is done by kern_linker later on.
743 *
744 * Returns EOPNOTSUPP if no relocation method is supplied.
745 */
746 static int
747 __elfN(reloc_ptr)(struct preloaded_file *mp, elf_file_t ef,
748 Elf_Addr p, void *val, size_t len)
749 {
750 size_t n;
751 Elf_Rela a;
752 Elf_Rel r;
753 int error;
754
755 /*
756 * The kernel is already relocated, but we still want to apply
757 * offset adjustments.
758 */
759 if (ef->kernel)
760 return (EOPNOTSUPP);
761
762 for (n = 0; n < ef->relsz / sizeof(r); n++) {
763 COPYOUT(ef->rel + n, &r, sizeof(r));
764
765 error = __elfN(reloc)(ef, __elfN(symaddr), &r, ELF_RELOC_REL,
766 ef->off, p, val, len);
767 if (error != 0)
768 return (error);
769 }
770 for (n = 0; n < ef->relasz / sizeof(a); n++) {
771 COPYOUT(ef->rela + n, &a, sizeof(a));
772
773 error = __elfN(reloc)(ef, __elfN(symaddr), &a, ELF_RELOC_RELA,
774 ef->off, p, val, len);
775 if (error != 0)
776 return (error);
777 }
778
779 return (0);
780 }
781
782 static Elf_Addr
783 __elfN(symaddr)(struct elf_file *ef, Elf_Size symidx)
784 {
785
786 /* Symbol lookup by index not required here. */
787 return (0);
788 }
789 Cache object: c70fddf94ad6d87cd292cc6a3c5e2923
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