3872ad3941379e3d2e19461a8e6de26e3b9bfa47
[dragonfly.git] / sys / kern / link_elf_obj.c
1 /*-
2  * Copyright (c) 1998 Doug Rabson
3  * Copyright (c) 2004 Peter Wemm
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  * $FreeBSD: src/sys/kern/link_elf.c,v 1.24 1999/12/24 15:33:36 bde Exp $
28  * $DragonFly: src/sys/kern/link_elf.c,v 1.29 2008/08/01 23:11:16 dillon Exp $
29  */
30
31 #include <sys/param.h>
32 #include <sys/kernel.h>
33 #include <sys/systm.h>
34 #include <sys/malloc.h>
35 #include <sys/proc.h>
36 #include <sys/nlookup.h>
37 #include <sys/fcntl.h>
38 #include <sys/vnode.h>
39 #include <sys/linker.h>
40 #include <machine/elf.h>
41
42 #include <vm/vm.h>
43 #include <vm/vm_param.h>
44 #include <vm/vm_zone.h>
45 #include <vm/vm_object.h>
46 #include <vm/vm_kern.h>
47 #include <vm/vm_extern.h>
48 #include <sys/lock.h>
49 #include <vm/pmap.h>
50 #include <vm/vm_map.h>
51
52 static int      link_elf_obj_preload_file(const char *, linker_file_t *);
53 static int      link_elf_obj_preload_finish(linker_file_t);
54 static int      link_elf_obj_load_file(const char *, linker_file_t *);
55 static int
56 link_elf_obj_lookup_symbol(linker_file_t, const char *,
57                        c_linker_sym_t *);
58 static int      link_elf_obj_symbol_values(linker_file_t, c_linker_sym_t, linker_symval_t *);
59 static int
60 link_elf_obj_search_symbol(linker_file_t, caddr_t value,
61                        c_linker_sym_t * sym, long *diffp);
62
63 static void     link_elf_obj_unload_file(linker_file_t);
64 static int
65 link_elf_obj_lookup_set(linker_file_t, const char *,
66                     void ***, void ***, int *);
67 static void     link_elf_obj_reloc_local(linker_file_t lf);
68 static int elf_obj_lookup(linker_file_t lf, Elf_Size symidx, int deps, Elf_Addr *);
69
70 static struct linker_class_ops link_elf_obj_class_ops = {
71         link_elf_obj_load_file,
72         link_elf_obj_preload_file,
73 };
74
75 static struct linker_file_ops link_elf_obj_file_ops = {
76         .lookup_symbol = link_elf_obj_lookup_symbol,
77         .symbol_values = link_elf_obj_symbol_values,
78         .search_symbol = link_elf_obj_search_symbol,
79         .preload_finish = link_elf_obj_preload_finish,
80         .unload = link_elf_obj_unload_file,
81         .lookup_set = link_elf_obj_lookup_set,
82 };
83
84 typedef struct {
85         void           *addr;
86         Elf_Off         size;
87         int             flags;
88         int             sec;            /* Original section */
89         char           *name;
90 }               Elf_progent;
91
92 typedef struct {
93         Elf_Rel        *rel;
94         int             nrel;
95         int             sec;
96 }               Elf_relent;
97
98 typedef struct {
99         Elf_Rela       *rela;
100         int             nrela;
101         int             sec;
102 }               Elf_relaent;
103
104
105 typedef struct elf_file {
106         int             preloaded;
107
108         caddr_t         address;        /* Relocation address */
109         size_t          bytes;          /* Chunk size in bytes */
110         vm_object_t     object;         /* VM object to hold file pages */
111         Elf_Shdr       *e_shdr;
112
113         Elf_progent    *progtab;
114         int             nprogtab;
115
116         Elf_relaent    *relatab;
117         int             nrelatab;
118
119         Elf_relent     *reltab;
120         int             nreltab;
121
122         Elf_Sym        *ddbsymtab;      /* The symbol table we are using */
123         long            ddbsymcnt;      /* Number of symbols */
124         caddr_t         ddbstrtab;      /* String table */
125         long            ddbstrcnt;      /* number of bytes in string table */
126
127         caddr_t         shstrtab;       /* Section name string table */
128         long            shstrcnt;       /* number of bytes in string table */
129
130         caddr_t         ctftab;         /* CTF table */
131         long            ctfcnt;         /* number of bytes in CTF table */
132         caddr_t         ctfoff;         /* CTF offset table */
133         caddr_t         typoff;         /* Type offset table */
134         long            typlen;         /* Number of type entries. */
135
136 }              *elf_file_t;
137
138 static int      relocate_file(linker_file_t lf);
139
140 /*
141  * The kernel symbol table starts here.
142  */
143 extern struct _dynamic _DYNAMIC;
144
145 static void
146 link_elf_obj_init(void *arg)
147 {
148 #if ELF_TARG_CLASS == ELFCLASS32
149         linker_add_class("elf32", NULL, &link_elf_obj_class_ops);
150 #else
151         linker_add_class("elf64", NULL, &link_elf_obj_class_ops);
152 #endif
153 }
154
155 SYSINIT(link_elf, SI_BOOT2_KLD, SI_ORDER_SECOND, link_elf_obj_init, 0);
156
157 static void
158 link_elf_obj_error(const char *file, const char *s)
159 {
160         kprintf("kldload: %s: %s\n", file, s);
161 }
162
163 static int
164 link_elf_obj_preload_file(const char *filename, linker_file_t *result)
165 {
166         Elf_Ehdr       *hdr;
167         Elf_Shdr       *shdr;
168         Elf_Sym *es;
169         caddr_t         modptr, baseptr, sizeptr;
170         char           *type;
171         elf_file_t      ef;
172         linker_file_t   lf;
173         Elf_Addr        off;
174         int             error, i, j, pb, ra, rl, shstrindex, symstrindex, symtabindex;
175
176         /*
177          * Look to see if we have the module preloaded.
178          */
179         modptr = preload_search_by_name(filename);
180         if (modptr == NULL)
181                 return ENOENT;
182
183         /* It's preloaded, check we can handle it and collect information */
184         type = (char *)preload_search_info(modptr, MODINFO_TYPE);
185         baseptr = preload_search_info(modptr, MODINFO_ADDR);
186         sizeptr = preload_search_info(modptr, MODINFO_SIZE);
187         hdr = (Elf_Ehdr *) preload_search_info(modptr, MODINFO_METADATA |
188                                                MODINFOMD_ELFHDR);
189         shdr = (Elf_Shdr *) preload_search_info(modptr, MODINFO_METADATA |
190                                                 MODINFOMD_SHDR);
191         if (type == NULL ||
192             (strcmp(type, "elf" __XSTRING(__ELF_WORD_SIZE) " obj module") != 0 &&
193              strcmp(type, "elf obj module") != 0)) {
194                 return (EFTYPE);
195         }
196         if (baseptr == NULL || sizeptr == NULL || hdr == NULL || shdr == NULL)
197                 return (EINVAL);
198
199         ef = kmalloc(sizeof(struct elf_file), M_LINKER, M_WAITOK | M_ZERO);
200         ef->preloaded = 1;
201         ef->address = *(caddr_t *) baseptr;
202         ef->bytes = 0;
203         lf = linker_make_file(filename, ef, &link_elf_obj_file_ops);
204         if (lf == NULL) {
205                 kfree(ef, M_LINKER);
206                 return ENOMEM;
207         }
208         lf->address = ef->address;
209         lf->size = *(size_t *) sizeptr;
210
211         if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS ||
212             hdr->e_ident[EI_DATA] != ELF_TARG_DATA ||
213             hdr->e_ident[EI_VERSION] != EV_CURRENT ||
214             hdr->e_version != EV_CURRENT ||
215             hdr->e_type != ET_REL ||
216             hdr->e_machine != ELF_TARG_MACH) {
217                 error = EFTYPE;
218                 goto out;
219         }
220         ef->e_shdr = shdr;
221
222         /* Scan the section header for information and table sizing. */
223         symtabindex = -1;
224         symstrindex = -1;
225         for (i = 0; i < hdr->e_shnum; i++) {
226                 switch (shdr[i].sh_type) {
227                 case SHT_PROGBITS:
228                 case SHT_NOBITS:
229                         ef->nprogtab++;
230                         break;
231                 case SHT_SYMTAB:
232                         symtabindex = i;
233                         symstrindex = shdr[i].sh_link;
234                         break;
235                 case SHT_REL:
236                         ef->nreltab++;
237                         break;
238                 case SHT_RELA:
239                         ef->nrelatab++;
240                         break;
241                 }
242         }
243
244         shstrindex = hdr->e_shstrndx;
245         if (ef->nprogtab == 0 || symstrindex < 0 ||
246             symstrindex >= hdr->e_shnum ||
247             shdr[symstrindex].sh_type != SHT_STRTAB || shstrindex == 0 ||
248             shstrindex >= hdr->e_shnum ||
249             shdr[shstrindex].sh_type != SHT_STRTAB) {
250                 error = ENOEXEC;
251                 goto out;
252         }
253         /* Allocate space for tracking the load chunks */
254         if (ef->nprogtab != 0)
255                 ef->progtab = kmalloc(ef->nprogtab * sizeof(*ef->progtab),
256                                      M_LINKER, M_WAITOK | M_ZERO);
257         if (ef->nreltab != 0)
258                 ef->reltab = kmalloc(ef->nreltab * sizeof(*ef->reltab),
259                                     M_LINKER, M_WAITOK | M_ZERO);
260         if (ef->nrelatab != 0)
261                 ef->relatab = kmalloc(ef->nrelatab * sizeof(*ef->relatab),
262                                      M_LINKER, M_WAITOK | M_ZERO);
263         if ((ef->nprogtab != 0 && ef->progtab == NULL) ||
264             (ef->nreltab != 0 && ef->reltab == NULL) ||
265             (ef->nrelatab != 0 && ef->relatab == NULL)) {
266                 error = ENOMEM;
267                 goto out;
268         }
269         /* XXX, relocate the sh_addr fields saved by the loader. */
270         off = 0;
271         for (i = 0; i < hdr->e_shnum; i++) {
272                 if (shdr[i].sh_addr != 0 && (off == 0 || shdr[i].sh_addr < off))
273                         off = shdr[i].sh_addr;
274         }
275         for (i = 0; i < hdr->e_shnum; i++) {
276                 if (shdr[i].sh_addr != 0)
277                         shdr[i].sh_addr = shdr[i].sh_addr - off +
278                                 (Elf_Addr) ef->address;
279         }
280
281         ef->ddbsymcnt = shdr[symtabindex].sh_size / sizeof(Elf_Sym);
282         ef->ddbsymtab = (Elf_Sym *) shdr[symtabindex].sh_addr;
283         ef->ddbstrcnt = shdr[symstrindex].sh_size;
284         ef->ddbstrtab = (char *)shdr[symstrindex].sh_addr;
285         ef->shstrcnt = shdr[shstrindex].sh_size;
286         ef->shstrtab = (char *)shdr[shstrindex].sh_addr;
287
288         /* Now fill out progtab and the relocation tables. */
289         pb = 0;
290         rl = 0;
291         ra = 0;
292         for (i = 0; i < hdr->e_shnum; i++) {
293                 switch (shdr[i].sh_type) {
294                 case SHT_PROGBITS:
295                 case SHT_NOBITS:
296                         ef->progtab[pb].addr = (void *)shdr[i].sh_addr;
297                         if (shdr[i].sh_type == SHT_PROGBITS)
298                                 ef->progtab[pb].name = "<<PROGBITS>>";
299                         else
300                                 ef->progtab[pb].name = "<<NOBITS>>";
301                         ef->progtab[pb].size = shdr[i].sh_size;
302                         ef->progtab[pb].sec = i;
303                         if (ef->shstrtab && shdr[i].sh_name != 0)
304                                 ef->progtab[pb].name =
305                                         ef->shstrtab + shdr[i].sh_name;
306 #if 0
307                         if (ef->progtab[pb].name != NULL &&
308                             !strcmp(ef->progtab[pb].name, "set_pcpu")) {
309                                 void           *dpcpu;
310
311                                 dpcpu = dpcpu_alloc(shdr[i].sh_size);
312                                 if (dpcpu == NULL) {
313                                         error = ENOSPC;
314                                         goto out;
315                                 }
316                                 memcpy(dpcpu, ef->progtab[pb].addr,
317                                        ef->progtab[pb].size);
318                                 dpcpu_copy(dpcpu, shdr[i].sh_size);
319                                 ef->progtab[pb].addr = dpcpu;
320 #ifdef VIMAGE
321                         } else if (ef->progtab[pb].name != NULL &&
322                                    !strcmp(ef->progtab[pb].name, VNET_SETNAME)) {
323                                 void           *vnet_data;
324
325                                 vnet_data = vnet_data_alloc(shdr[i].sh_size);
326                                 if (vnet_data == NULL) {
327                                         error = ENOSPC;
328                                         goto out;
329                                 }
330                                 memcpy(vnet_data, ef->progtab[pb].addr,
331                                        ef->progtab[pb].size);
332                                 vnet_data_copy(vnet_data, shdr[i].sh_size);
333                                 ef->progtab[pb].addr = vnet_data;
334 #endif
335                         }
336 #endif
337                         /* Update all symbol values with the offset. */
338                         for (j = 0; j < ef->ddbsymcnt; j++) {
339                                 es = &ef->ddbsymtab[j];
340                                 if (es->st_shndx != i)
341                                         continue;
342                                 es->st_value += (Elf_Addr) ef->progtab[pb].addr;
343                         }
344                         pb++;
345                         break;
346                 case SHT_REL:
347                         ef->reltab[rl].rel = (Elf_Rel *) shdr[i].sh_addr;
348                         ef->reltab[rl].nrel = shdr[i].sh_size / sizeof(Elf_Rel);
349                         ef->reltab[rl].sec = shdr[i].sh_info;
350                         rl++;
351                         break;
352                 case SHT_RELA:
353                         ef->relatab[ra].rela = (Elf_Rela *) shdr[i].sh_addr;
354                         ef->relatab[ra].nrela =
355                                 shdr[i].sh_size / sizeof(Elf_Rela);
356                         ef->relatab[ra].sec = shdr[i].sh_info;
357                         ra++;
358                         break;
359                 }
360         }
361         if (pb != ef->nprogtab)
362                 panic("lost progbits");
363         if (rl != ef->nreltab)
364                 panic("lost reltab");
365         if (ra != ef->nrelatab)
366                 panic("lost relatab");
367
368         /* Local intra-module relocations */
369         link_elf_obj_reloc_local(lf);
370
371         *result = lf;
372         return (0);
373
374 out:
375         /* preload not done this way */
376         linker_file_unload(lf /* , LINKER_UNLOAD_FORCE */ );
377         return (error);
378 }
379
380 static int
381 link_elf_obj_preload_finish(linker_file_t lf)
382 {
383         int error;
384
385         error = relocate_file(lf);
386
387         return (error);
388 }
389
390 static int
391 link_elf_obj_load_file(const char *filename, linker_file_t * result)
392 {
393         struct nlookupdata nd;
394         struct thread  *td = curthread; /* XXX */
395         struct proc    *p = td->td_proc;
396         char           *pathname;
397         struct vnode   *vp;
398         Elf_Ehdr       *hdr;
399         Elf_Shdr       *shdr;
400         Elf_Sym        *es;
401         int             nbytes, i, j;
402         vm_offset_t     mapbase;
403         size_t          mapsize;
404         int             error = 0;
405         int             resid;
406         elf_file_t      ef;
407         linker_file_t   lf;
408         int             symtabindex;
409         int             symstrindex;
410         int             shstrindex;
411         int             nsym;
412         int             pb, rl, ra;
413         int             alignmask;
414
415         /* XXX Hack for firmware loading where p == NULL */
416         if (p == NULL) {
417                 p = &proc0;
418         }
419
420         KKASSERT(p != NULL);
421         if (p->p_ucred == NULL) {
422                 kprintf("link_elf_obj_load_file: cannot load '%s' from filesystem"
423                         " this early\n", filename);
424                 return ENOENT;
425         }
426         shdr = NULL;
427         lf = NULL;
428         mapsize = 0;
429         hdr = NULL;
430         pathname = linker_search_path(filename);
431         if (pathname == NULL)
432                 return ENOENT;
433
434         error = nlookup_init(&nd, pathname, UIO_SYSSPACE, NLC_FOLLOW | NLC_LOCKVP);
435         if (error == 0)
436                 error = vn_open(&nd, NULL, FREAD, 0);
437         kfree(pathname, M_LINKER);
438         if (error) {
439                 nlookup_done(&nd);
440                 return error;
441         }
442         vp = nd.nl_open_vp;
443         nd.nl_open_vp = NULL;
444         nlookup_done(&nd);
445
446         /*
447          * Read the elf header from the file.
448          */
449         hdr = kmalloc(sizeof(*hdr), M_LINKER, M_WAITOK);
450         if (hdr == NULL) {
451                 error = ENOMEM;
452                 goto out;
453         }
454         error = vn_rdwr(UIO_READ, vp, (void *)hdr, sizeof(*hdr), 0,
455                         UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
456         if (error)
457                 goto out;
458         if (resid != 0) {
459                 error = ENOEXEC;
460                 goto out;
461         }
462         if (!IS_ELF(*hdr)) {
463                 error = ENOEXEC;
464                 goto out;
465         }
466
467         if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS
468             || hdr->e_ident[EI_DATA] != ELF_TARG_DATA) {
469                 link_elf_obj_error(filename, "Unsupported file layout");
470                 error = ENOEXEC;
471                 goto out;
472         }
473         if (hdr->e_ident[EI_VERSION] != EV_CURRENT
474             || hdr->e_version != EV_CURRENT) {
475                 link_elf_obj_error(filename, "Unsupported file version");
476                 error = ENOEXEC;
477                 goto out;
478         }
479         if (hdr->e_type != ET_REL) {
480                 error = ENOSYS;
481                 goto out;
482         }
483         if (hdr->e_machine != ELF_TARG_MACH) {
484                 link_elf_obj_error(filename, "Unsupported machine");
485                 error = ENOEXEC;
486                 goto out;
487         }
488
489         ef = kmalloc(sizeof(struct elf_file), M_LINKER, M_WAITOK | M_ZERO);
490         lf = linker_make_file(filename, ef, &link_elf_obj_file_ops);
491         if (lf == NULL) {
492                 kfree(ef, M_LINKER);
493                 error = ENOMEM;
494                 goto out;
495         }
496         ef->nprogtab = 0;
497         ef->e_shdr = 0;
498         ef->nreltab = 0;
499         ef->nrelatab = 0;
500
501         /* Allocate and read in the section header */
502         nbytes = hdr->e_shnum * hdr->e_shentsize;
503         if (nbytes == 0 || hdr->e_shoff == 0 ||
504             hdr->e_shentsize != sizeof(Elf_Shdr)) {
505                 error = ENOEXEC;
506                 goto out;
507         }
508         shdr = kmalloc(nbytes, M_LINKER, M_WAITOK);
509         if (shdr == NULL) {
510                 error = ENOMEM;
511                 goto out;
512         }
513         ef->e_shdr = shdr;
514         error = vn_rdwr(UIO_READ, vp, (caddr_t) shdr, nbytes, hdr->e_shoff,
515                         UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
516         if (error)
517                 goto out;
518         if (resid) {
519                 error = ENOEXEC;
520                 goto out;
521         }
522         /* Scan the section header for information and table sizing. */
523         nsym = 0;
524         symtabindex = -1;
525         symstrindex = -1;
526         for (i = 0; i < hdr->e_shnum; i++) {
527                 switch (shdr[i].sh_type) {
528                 case SHT_PROGBITS:
529                 case SHT_NOBITS:
530                         ef->nprogtab++;
531                         break;
532                 case SHT_SYMTAB:
533                         nsym++;
534                         symtabindex = i;
535                         symstrindex = shdr[i].sh_link;
536                         break;
537                 case SHT_REL:
538                         ef->nreltab++;
539                         break;
540                 case SHT_RELA:
541                         ef->nrelatab++;
542                         break;
543                 case SHT_STRTAB:
544                         break;
545                 }
546         }
547         if (ef->nprogtab == 0) {
548                 link_elf_obj_error(filename, "file has no contents");
549                 error = ENOEXEC;
550                 goto out;
551         }
552         if (nsym != 1) {
553                 /* Only allow one symbol table for now */
554                 link_elf_obj_error(filename, "file has no valid symbol table");
555                 error = ENOEXEC;
556                 goto out;
557         }
558         if (symstrindex < 0 || symstrindex > hdr->e_shnum ||
559             shdr[symstrindex].sh_type != SHT_STRTAB) {
560                 link_elf_obj_error(filename, "file has invalid symbol strings");
561                 error = ENOEXEC;
562                 goto out;
563         }
564         /* Allocate space for tracking the load chunks */
565         if (ef->nprogtab != 0)
566                 ef->progtab = kmalloc(ef->nprogtab * sizeof(*ef->progtab),
567                                       M_LINKER, M_WAITOK | M_ZERO);
568         if (ef->nreltab != 0)
569                 ef->reltab = kmalloc(ef->nreltab * sizeof(*ef->reltab),
570                                      M_LINKER, M_WAITOK | M_ZERO);
571         if (ef->nrelatab != 0)
572                 ef->relatab = kmalloc(ef->nrelatab * sizeof(*ef->relatab),
573                                       M_LINKER, M_WAITOK | M_ZERO);
574         if ((ef->nprogtab != 0 && ef->progtab == NULL) ||
575             (ef->nreltab != 0 && ef->reltab == NULL) ||
576             (ef->nrelatab != 0 && ef->relatab == NULL)) {
577                 error = ENOMEM;
578                 goto out;
579         }
580         if (symtabindex == -1)
581                 panic("lost symbol table index");
582         /* Allocate space for and load the symbol table */
583         ef->ddbsymcnt = shdr[symtabindex].sh_size / sizeof(Elf_Sym);
584         ef->ddbsymtab = kmalloc(shdr[symtabindex].sh_size, M_LINKER, M_WAITOK);
585         if (ef->ddbsymtab == NULL) {
586                 error = ENOMEM;
587                 goto out;
588         }
589         error = vn_rdwr(UIO_READ, vp, (void *)ef->ddbsymtab,
590                         shdr[symtabindex].sh_size, shdr[symtabindex].sh_offset,
591                         UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
592         if (error)
593                 goto out;
594         if (resid != 0) {
595                 error = EINVAL;
596                 goto out;
597         }
598         if (symstrindex == -1)
599                 panic("lost symbol string index");
600         /* Allocate space for and load the symbol strings */
601         ef->ddbstrcnt = shdr[symstrindex].sh_size;
602         ef->ddbstrtab = kmalloc(shdr[symstrindex].sh_size, M_LINKER, M_WAITOK);
603         if (ef->ddbstrtab == NULL) {
604                 error = ENOMEM;
605                 goto out;
606         }
607         error = vn_rdwr(UIO_READ, vp, ef->ddbstrtab,
608                         shdr[symstrindex].sh_size, shdr[symstrindex].sh_offset,
609                         UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
610         if (error)
611                 goto out;
612         if (resid != 0) {
613                 error = EINVAL;
614                 goto out;
615         }
616         /* Do we have a string table for the section names?  */
617         shstrindex = -1;
618         if (hdr->e_shstrndx != 0 &&
619             shdr[hdr->e_shstrndx].sh_type == SHT_STRTAB) {
620                 shstrindex = hdr->e_shstrndx;
621                 ef->shstrcnt = shdr[shstrindex].sh_size;
622                 ef->shstrtab = kmalloc(shdr[shstrindex].sh_size, M_LINKER,
623                                        M_WAITOK);
624                 if (ef->shstrtab == NULL) {
625                         error = ENOMEM;
626                         goto out;
627                 }
628                 error = vn_rdwr(UIO_READ, vp, ef->shstrtab,
629                                 shdr[shstrindex].sh_size, shdr[shstrindex].sh_offset,
630                                 UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
631                 if (error)
632                         goto out;
633                 if (resid != 0) {
634                         error = EINVAL;
635                         goto out;
636                 }
637         }
638         /* Size up code/data(progbits) and bss(nobits). */
639         alignmask = 0;
640         for (i = 0; i < hdr->e_shnum; i++) {
641                 switch (shdr[i].sh_type) {
642                 case SHT_PROGBITS:
643                 case SHT_NOBITS:
644                         alignmask = shdr[i].sh_addralign - 1;
645                         mapsize += alignmask;
646                         mapsize &= ~alignmask;
647                         mapsize += shdr[i].sh_size;
648                         break;
649                 }
650         }
651
652         /*
653          * We know how much space we need for the text/data/bss/etc. This
654          * stuff needs to be in a single chunk so that profiling etc can get
655          * the bounds and gdb can associate offsets with modules
656          */
657         ef->object = vm_object_allocate(OBJT_DEFAULT,
658                                         round_page(mapsize) >> PAGE_SHIFT);
659         if (ef->object == NULL) {
660                 error = ENOMEM;
661                 goto out;
662         }
663         vm_object_hold(ef->object);
664         vm_object_reference_locked(ef->object);
665         ef->address = (caddr_t) vm_map_min(&kernel_map);
666         ef->bytes = 0;
667
668         /*
669          * In order to satisfy x86_64's architectural requirements on the
670          * location of code and data in the kernel's address space, request a
671          * mapping that is above the kernel.
672          *
673          * vkernel64's text+data is outside the managed VM space entirely.
674          */
675 #if defined(__amd64__) && defined(_KERNEL_VIRTUAL)
676         error = vkernel_module_memory_alloc(&mapbase, round_page(mapsize));
677 #else
678         mapbase = KERNBASE;
679         error = vm_map_find(&kernel_map, ef->object, 0, &mapbase,
680                             round_page(mapsize), PAGE_SIZE,
681                             TRUE, VM_MAPTYPE_NORMAL,
682                             VM_PROT_ALL, VM_PROT_ALL, FALSE);
683         vm_object_drop(ef->object);
684         if (error) {
685                 vm_object_deallocate(ef->object);
686                 ef->object = NULL;
687                 goto out;
688         }
689         /* Wire the pages */
690         error = vm_map_wire(&kernel_map, mapbase,
691                             mapbase + round_page(mapsize), 0);
692 #endif
693         if (error != KERN_SUCCESS) {
694                 error = ENOMEM;
695                 goto out;
696         }
697         /* Inform the kld system about the situation */
698         lf->address = ef->address = (caddr_t) mapbase;
699         lf->size = round_page(mapsize);
700         ef->bytes = mapsize;
701
702         /*
703          * Now load code/data(progbits), zero bss(nobits), allocate space for
704          * and load relocs
705          */
706         pb = 0;
707         rl = 0;
708         ra = 0;
709         alignmask = 0;
710         for (i = 0; i < hdr->e_shnum; i++) {
711                 switch (shdr[i].sh_type) {
712                 case SHT_PROGBITS:
713                 case SHT_NOBITS:
714                         alignmask = shdr[i].sh_addralign - 1;
715                         mapbase += alignmask;
716                         mapbase &= ~alignmask;
717                         if (ef->shstrtab && shdr[i].sh_name != 0)
718                                 ef->progtab[pb].name =
719                                         ef->shstrtab + shdr[i].sh_name;
720                         else if (shdr[i].sh_type == SHT_PROGBITS)
721                                 ef->progtab[pb].name = "<<PROGBITS>>";
722                         else
723                                 ef->progtab[pb].name = "<<NOBITS>>";
724 #if 0
725                         if (ef->progtab[pb].name != NULL &&
726                             !strcmp(ef->progtab[pb].name, "set_pcpu"))
727                                 ef->progtab[pb].addr =
728                                         dpcpu_alloc(shdr[i].sh_size);
729 #ifdef VIMAGE
730                         else if (ef->progtab[pb].name != NULL &&
731                                  !strcmp(ef->progtab[pb].name, VNET_SETNAME))
732                                 ef->progtab[pb].addr =
733                                         vnet_data_alloc(shdr[i].sh_size);
734 #endif
735                         else
736 #endif
737                                 ef->progtab[pb].addr =
738                                         (void *)(uintptr_t) mapbase;
739                         if (ef->progtab[pb].addr == NULL) {
740                                 error = ENOSPC;
741                                 goto out;
742                         }
743                         ef->progtab[pb].size = shdr[i].sh_size;
744                         ef->progtab[pb].sec = i;
745                         if (shdr[i].sh_type == SHT_PROGBITS) {
746                                 error = vn_rdwr(UIO_READ, vp,
747                                                 ef->progtab[pb].addr,
748                                                 shdr[i].sh_size, shdr[i].sh_offset,
749                                                 UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred,
750                                                 &resid);
751                                 if (error)
752                                         goto out;
753                                 if (resid != 0) {
754                                         error = EINVAL;
755                                         goto out;
756                                 }
757 #if 0
758                                 /* Initialize the per-cpu or vnet area. */
759                                 if (ef->progtab[pb].addr != (void *)mapbase &&
760                                     !strcmp(ef->progtab[pb].name, "set_pcpu"))
761                                         dpcpu_copy(ef->progtab[pb].addr,
762                                                    shdr[i].sh_size);
763 #ifdef VIMAGE
764                                 else if (ef->progtab[pb].addr !=
765                                          (void *)mapbase &&
766                                          !strcmp(ef->progtab[pb].name, VNET_SETNAME))
767                                         vnet_data_copy(ef->progtab[pb].addr,
768                                                        shdr[i].sh_size);
769 #endif
770 #endif
771                         } else
772                                 bzero(ef->progtab[pb].addr, shdr[i].sh_size);
773
774                         /* Update all symbol values with the offset. */
775                         for (j = 0; j < ef->ddbsymcnt; j++) {
776                                 es = &ef->ddbsymtab[j];
777                                 if (es->st_shndx != i)
778                                         continue;
779                                 es->st_value += (Elf_Addr) ef->progtab[pb].addr;
780                         }
781                         mapbase += shdr[i].sh_size;
782                         pb++;
783                         break;
784                 case SHT_REL:
785                         ef->reltab[rl].rel = kmalloc(shdr[i].sh_size, M_LINKER, M_WAITOK);
786                         ef->reltab[rl].nrel = shdr[i].sh_size / sizeof(Elf_Rel);
787                         ef->reltab[rl].sec = shdr[i].sh_info;
788                         error = vn_rdwr(UIO_READ, vp,
789                                         (void *)ef->reltab[rl].rel,
790                                         shdr[i].sh_size, shdr[i].sh_offset,
791                                         UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
792                         if (error)
793                                 goto out;
794                         if (resid != 0) {
795                                 error = EINVAL;
796                                 goto out;
797                         }
798                         rl++;
799                         break;
800                 case SHT_RELA:
801                         ef->relatab[ra].rela = kmalloc(shdr[i].sh_size, M_LINKER, M_WAITOK);
802                         ef->relatab[ra].nrela = shdr[i].sh_size / sizeof(Elf_Rela);
803                         ef->relatab[ra].sec = shdr[i].sh_info;
804                         error = vn_rdwr(UIO_READ, vp,
805                                         (void *)ef->relatab[ra].rela,
806                                         shdr[i].sh_size, shdr[i].sh_offset,
807                                         UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
808                         if (error)
809                                 goto out;
810                         if (resid != 0) {
811                                 error = EINVAL;
812                                 goto out;
813                         }
814                         ra++;
815                         break;
816                 }
817         }
818         if (pb != ef->nprogtab)
819                 panic("lost progbits");
820         if (rl != ef->nreltab)
821                 panic("lost reltab");
822         if (ra != ef->nrelatab)
823                 panic("lost relatab");
824         if (mapbase != (vm_offset_t) ef->address + mapsize)
825                 panic("mapbase 0x%lx != address %p + mapsize 0x%lx (0x%lx)\n",
826                       mapbase, ef->address, mapsize,
827                       (vm_offset_t) ef->address + mapsize);
828
829         /* Local intra-module relocations */
830         link_elf_obj_reloc_local(lf);
831
832         /* Pull in dependencies */
833         error = linker_load_dependencies(lf);
834         if (error)
835                 goto out;
836
837         /* External relocations */
838         error = relocate_file(lf);
839         if (error)
840                 goto out;
841
842         *result = lf;
843
844 out:
845         if (error && lf)
846                 linker_file_unload(lf /*, LINKER_UNLOAD_FORCE */);
847         if (hdr)
848                 kfree(hdr, M_LINKER);
849         vn_unlock(vp);
850         vn_close(vp, FREAD);
851
852         return error;
853 }
854
855 static void
856 link_elf_obj_unload_file(linker_file_t file)
857 {
858         elf_file_t      ef = file->priv;
859         int i;
860
861         if (ef->progtab) {
862                 for (i = 0; i < ef->nprogtab; i++) {
863                         if (ef->progtab[i].size == 0)
864                                 continue;
865                         if (ef->progtab[i].name == NULL)
866                                 continue;
867 #if 0
868                         if (!strcmp(ef->progtab[i].name, "set_pcpu"))
869                                 dpcpu_free(ef->progtab[i].addr,
870                                     ef->progtab[i].size);
871 #ifdef VIMAGE
872                         else if (!strcmp(ef->progtab[i].name, VNET_SETNAME))
873                                 vnet_data_free(ef->progtab[i].addr,
874                                     ef->progtab[i].size);
875 #endif
876 #endif
877                 }
878         }
879         if (ef->preloaded) {
880                 if (ef->reltab)
881                         kfree(ef->reltab, M_LINKER);
882                 if (ef->relatab)
883                         kfree(ef->relatab, M_LINKER);
884                 if (ef->progtab)
885                         kfree(ef->progtab, M_LINKER);
886                 if (ef->ctftab)
887                         kfree(ef->ctftab, M_LINKER);
888                 if (ef->ctfoff)
889                         kfree(ef->ctfoff, M_LINKER);
890                 if (ef->typoff)
891                         kfree(ef->typoff, M_LINKER);
892                 if (file->filename != NULL)
893                         preload_delete_name(file->filename);
894                 kfree(ef, M_LINKER);
895                 /* XXX reclaim module memory? */
896                 return;
897         }
898
899         for (i = 0; i < ef->nreltab; i++)
900                 if (ef->reltab[i].rel)
901                         kfree(ef->reltab[i].rel, M_LINKER);
902         for (i = 0; i < ef->nrelatab; i++)
903                 if (ef->relatab[i].rela)
904                         kfree(ef->relatab[i].rela, M_LINKER);
905         if (ef->reltab)
906                 kfree(ef->reltab, M_LINKER);
907         if (ef->relatab)
908                 kfree(ef->relatab, M_LINKER);
909         if (ef->progtab)
910                 kfree(ef->progtab, M_LINKER);
911
912         if (ef->object) {
913 #if defined(__amd64__) && defined(_KERNEL_VIRTUAL)
914                 vkernel_module_memory_free((vm_offset_t)ef->address, ef->bytes);
915 #else
916                 vm_map_remove(&kernel_map, (vm_offset_t) ef->address,
917                     (vm_offset_t) ef->address +
918                     (ef->object->size << PAGE_SHIFT));
919 #endif
920                 vm_object_deallocate(ef->object);
921                 ef->object = NULL;
922         }
923         if (ef->e_shdr)
924                 kfree(ef->e_shdr, M_LINKER);
925         if (ef->ddbsymtab)
926                 kfree(ef->ddbsymtab, M_LINKER);
927         if (ef->ddbstrtab)
928                 kfree(ef->ddbstrtab, M_LINKER);
929         if (ef->shstrtab)
930                 kfree(ef->shstrtab, M_LINKER);
931         if (ef->ctftab)
932                 kfree(ef->ctftab, M_LINKER);
933         if (ef->ctfoff)
934                 kfree(ef->ctfoff, M_LINKER);
935         if (ef->typoff)
936                 kfree(ef->typoff, M_LINKER);
937         kfree(ef, M_LINKER);
938 }
939
940 static const char *
941 symbol_name(elf_file_t ef, Elf_Size r_info)
942 {
943         const Elf_Sym  *ref;
944
945         if (ELF_R_SYM(r_info)) {
946                 ref = ef->ddbsymtab + ELF_R_SYM(r_info);
947                 return ef->ddbstrtab + ref->st_name;
948         } else
949                 return NULL;
950 }
951
952 static Elf_Addr
953 findbase(elf_file_t ef, int sec)
954 {
955         int i;
956         Elf_Addr base = 0;
957
958         for (i = 0; i < ef->nprogtab; i++) {
959                 if (sec == ef->progtab[i].sec) {
960                         base = (Elf_Addr)ef->progtab[i].addr;
961                         break;
962                 }
963         }
964         return base;
965 }
966
967 static int
968 relocate_file(linker_file_t lf)
969 {
970         elf_file_t      ef = lf->priv;
971         const Elf_Rel *rellim;
972         const Elf_Rel *rel;
973         const Elf_Rela *relalim;
974         const Elf_Rela *rela;
975         const char *symname;
976         const Elf_Sym *sym;
977         int i;
978         Elf_Size symidx;
979         Elf_Addr base;
980
981         /* Perform relocations without addend if there are any: */
982         for (i = 0; i < ef->nreltab; i++) {
983                 rel = ef->reltab[i].rel;
984                 if (rel == NULL)
985                         panic("lost a reltab!");
986                 rellim = rel + ef->reltab[i].nrel;
987                 base = findbase(ef, ef->reltab[i].sec);
988                 if (base == 0)
989                         panic("lost base for reltab");
990                 for ( ; rel < rellim; rel++) {
991                         symidx = ELF_R_SYM(rel->r_info);
992                         if (symidx >= ef->ddbsymcnt)
993                                 continue;
994                         sym = ef->ddbsymtab + symidx;
995                         /* Local relocs are already done */
996                         if (ELF_ST_BIND(sym->st_info) == STB_LOCAL)
997                                 continue;
998                         if (elf_reloc(lf, base, rel, ELF_RELOC_REL,
999                             elf_obj_lookup)) {
1000                                 symname = symbol_name(ef, rel->r_info);
1001                                 kprintf("link_elf_obj_obj: symbol %s undefined\n",
1002                                     symname);
1003                                 return ENOENT;
1004                         }
1005                 }
1006         }
1007
1008         /* Perform relocations with addend if there are any: */
1009         for (i = 0; i < ef->nrelatab; i++) {
1010                 rela = ef->relatab[i].rela;
1011                 if (rela == NULL)
1012                         panic("lost a relatab!");
1013                 relalim = rela + ef->relatab[i].nrela;
1014                 base = findbase(ef, ef->relatab[i].sec);
1015                 if (base == 0)
1016                         panic("lost base for relatab");
1017                 for ( ; rela < relalim; rela++) {
1018                         symidx = ELF_R_SYM(rela->r_info);
1019                         if (symidx >= ef->ddbsymcnt)
1020                                 continue;
1021                         sym = ef->ddbsymtab + symidx;
1022                         /* Local relocs are already done */
1023                         if (ELF_ST_BIND(sym->st_info) == STB_LOCAL)
1024                                 continue;
1025                         if (elf_reloc(lf, base, rela, ELF_RELOC_RELA,
1026                             elf_obj_lookup)) {
1027                                 symname = symbol_name(ef, rela->r_info);
1028                                 kprintf("link_elf_obj_obj: symbol %s undefined\n",
1029                                     symname);
1030                                 return ENOENT;
1031                         }
1032                 }
1033         }
1034
1035         return 0;
1036 }
1037
1038 static int
1039 link_elf_obj_lookup_symbol(linker_file_t lf, const char *name, c_linker_sym_t *sym)
1040 {
1041         elf_file_t ef = lf->priv;
1042         const Elf_Sym *symp;
1043         const char *strp;
1044         int i;
1045
1046         for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) {
1047                 strp = ef->ddbstrtab + symp->st_name;
1048                 if (symp->st_shndx != SHN_UNDEF && strcmp(name, strp) == 0) {
1049                         *sym = (c_linker_sym_t) symp;
1050                         return 0;
1051                 }
1052         }
1053         return ENOENT;
1054 }
1055
1056 static int
1057 link_elf_obj_symbol_values(linker_file_t lf, c_linker_sym_t sym,
1058     linker_symval_t *symval)
1059 {
1060         elf_file_t ef = lf->priv;
1061         const Elf_Sym *es = (const Elf_Sym*) sym;
1062
1063         if (es >= ef->ddbsymtab && es < (ef->ddbsymtab + ef->ddbsymcnt)) {
1064                 symval->name = ef->ddbstrtab + es->st_name;
1065                 symval->value = (caddr_t)es->st_value;
1066                 symval->size = es->st_size;
1067                 return 0;
1068         }
1069         return ENOENT;
1070 }
1071
1072 static int
1073 link_elf_obj_search_symbol(linker_file_t lf, caddr_t value,
1074     c_linker_sym_t *sym, long *diffp)
1075 {
1076         elf_file_t ef = lf->priv;
1077         u_long off = (uintptr_t) (void *) value;
1078         u_long diff = off;
1079         u_long st_value;
1080         const Elf_Sym *es;
1081         const Elf_Sym *best = 0;
1082         int i;
1083
1084         for (i = 0, es = ef->ddbsymtab; i < ef->ddbsymcnt; i++, es++) {
1085                 if (es->st_name == 0)
1086                         continue;
1087                 st_value = es->st_value;
1088                 if (off >= st_value) {
1089                         if (off - st_value < diff) {
1090                                 diff = off - st_value;
1091                                 best = es;
1092                                 if (diff == 0)
1093                                         break;
1094                         } else if (off - st_value == diff) {
1095                                 best = es;
1096                         }
1097                 }
1098         }
1099         if (best == 0)
1100                 *diffp = off;
1101         else
1102                 *diffp = diff;
1103         *sym = (c_linker_sym_t) best;
1104
1105         return 0;
1106 }
1107
1108 /*
1109  * Look up a linker set on an ELF system.
1110  */
1111 static int
1112 link_elf_obj_lookup_set(linker_file_t lf, const char *name,
1113     void ***startp, void ***stopp, int *countp)
1114 {
1115         elf_file_t ef = lf->priv;
1116         void **start, **stop;
1117         int i, count;
1118
1119         /* Relative to section number */
1120         for (i = 0; i < ef->nprogtab; i++) {
1121                 if ((strncmp(ef->progtab[i].name, "set_", 4) == 0) &&
1122                     strcmp(ef->progtab[i].name + 4, name) == 0) {
1123                         start  = (void **)ef->progtab[i].addr;
1124                         stop = (void **)((char *)ef->progtab[i].addr +
1125                             ef->progtab[i].size);
1126                         count = stop - start;
1127                         if (startp)
1128                                 *startp = start;
1129                         if (stopp)
1130                                 *stopp = stop;
1131                         if (countp)
1132                                 *countp = count;
1133                         return (0);
1134                 }
1135         }
1136         return (ESRCH);
1137 }
1138
1139 /*
1140  * Symbol lookup function that can be used when the symbol index is known (ie
1141  * in relocations). It uses the symbol index instead of doing a fully fledged
1142  * hash table based lookup when such is valid. For example for local symbols.
1143  * This is not only more efficient, it's also more correct. It's not always
1144  * the case that the symbol can be found through the hash table.
1145  */
1146 static int
1147 elf_obj_lookup(linker_file_t lf, Elf_Size symidx, int deps, Elf_Addr *result)
1148 {
1149         elf_file_t ef = lf->priv;
1150         const Elf_Sym *sym;
1151         const char *symbol;
1152
1153         /* Don't even try to lookup the symbol if the index is bogus. */
1154         if (symidx >= ef->ddbsymcnt)
1155                 return (ENOENT);
1156
1157         sym = ef->ddbsymtab + symidx;
1158
1159         /* Quick answer if there is a definition included. */
1160         if (sym->st_shndx != SHN_UNDEF) {
1161                 *result = sym->st_value;
1162                 return (0);
1163         }
1164
1165         /* If we get here, then it is undefined and needs a lookup. */
1166         switch (ELF_ST_BIND(sym->st_info)) {
1167         case STB_LOCAL:
1168                 /* Local, but undefined? huh? */
1169                 return (ENOENT);
1170
1171         case STB_GLOBAL:
1172                 /* Relative to Data or Function name */
1173                 symbol = ef->ddbstrtab + sym->st_name;
1174
1175                 /* Force a lookup failure if the symbol name is bogus. */
1176                 if (*symbol == 0)
1177                         return (ENOENT);
1178                 return (linker_file_lookup_symbol(lf, symbol, deps, (caddr_t *)result));
1179
1180         case STB_WEAK:
1181                 kprintf("link_elf_obj_obj: Weak symbols not supported\n");
1182                 return (ENOENT);
1183
1184         default:
1185                 return (ENOENT);
1186         }
1187 }
1188
1189 static void
1190 link_elf_obj_fix_link_set(elf_file_t ef)
1191 {
1192         static const char startn[] = "__start_";
1193         static const char stopn[] = "__stop_";
1194         Elf_Sym *sym;
1195         const char *sym_name, *linkset_name;
1196         Elf_Addr startp, stopp;
1197         Elf_Size symidx;
1198         int start, i;
1199
1200         startp = stopp = 0;
1201         for (symidx = 1 /* zero entry is special */;
1202                 symidx < ef->ddbsymcnt; symidx++) {
1203                 sym = ef->ddbsymtab + symidx;
1204                 if (sym->st_shndx != SHN_UNDEF)
1205                         continue;
1206
1207                 sym_name = ef->ddbstrtab + sym->st_name;
1208                 if (strncmp(sym_name, startn, sizeof(startn) - 1) == 0) {
1209                         start = 1;
1210                         linkset_name = sym_name + sizeof(startn) - 1;
1211                 }
1212                 else if (strncmp(sym_name, stopn, sizeof(stopn) - 1) == 0) {
1213                         start = 0;
1214                         linkset_name = sym_name + sizeof(stopn) - 1;
1215                 }
1216                 else
1217                         continue;
1218
1219                 for (i = 0; i < ef->nprogtab; i++) {
1220                         if (strcmp(ef->progtab[i].name, linkset_name) == 0) {
1221                                 startp = (Elf_Addr)ef->progtab[i].addr;
1222                                 stopp = (Elf_Addr)(startp + ef->progtab[i].size);
1223                                 break;
1224                         }
1225                 }
1226                 if (i == ef->nprogtab)
1227                         continue;
1228
1229                 sym->st_value = start ? startp : stopp;
1230                 sym->st_shndx = i;
1231         }
1232 }
1233
1234 static void
1235 link_elf_obj_reloc_local(linker_file_t lf)
1236 {
1237         elf_file_t ef = lf->priv;
1238         const Elf_Rel *rellim;
1239         const Elf_Rel *rel;
1240         const Elf_Rela *relalim;
1241         const Elf_Rela *rela;
1242         const Elf_Sym *sym;
1243         Elf_Addr base;
1244         int i;
1245         Elf_Size symidx;
1246
1247         link_elf_obj_fix_link_set(ef);
1248
1249         /* Perform relocations without addend if there are any: */
1250         for (i = 0; i < ef->nreltab; i++) {
1251                 rel = ef->reltab[i].rel;
1252                 if (rel == NULL)
1253                         panic("lost a reltab!");
1254                 rellim = rel + ef->reltab[i].nrel;
1255                 base = findbase(ef, ef->reltab[i].sec);
1256                 if (base == 0)
1257                         panic("lost base for reltab");
1258                 for ( ; rel < rellim; rel++) {
1259                         symidx = ELF_R_SYM(rel->r_info);
1260                         if (symidx >= ef->ddbsymcnt)
1261                                 continue;
1262                         sym = ef->ddbsymtab + symidx;
1263                         /* Only do local relocs */
1264                         if (ELF_ST_BIND(sym->st_info) != STB_LOCAL)
1265                                 continue;
1266                         elf_reloc_local(lf, base, rel, ELF_RELOC_REL,
1267                             elf_obj_lookup);
1268                 }
1269         }
1270
1271         /* Perform relocations with addend if there are any: */
1272         for (i = 0; i < ef->nrelatab; i++) {
1273                 rela = ef->relatab[i].rela;
1274                 if (rela == NULL)
1275                         panic("lost a relatab!");
1276                 relalim = rela + ef->relatab[i].nrela;
1277                 base = findbase(ef, ef->relatab[i].sec);
1278                 if (base == 0)
1279                         panic("lost base for relatab");
1280                 for ( ; rela < relalim; rela++) {
1281                         symidx = ELF_R_SYM(rela->r_info);
1282                         if (symidx >= ef->ddbsymcnt)
1283                                 continue;
1284                         sym = ef->ddbsymtab + symidx;
1285                         /* Only do local relocs */
1286                         if (ELF_ST_BIND(sym->st_info) != STB_LOCAL)
1287                                 continue;
1288                         elf_reloc_local(lf, base, rela, ELF_RELOC_RELA,
1289                             elf_obj_lookup);
1290                 }
1291         }
1292 }