Fix mis-paste (move section down 1 line)
[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  */
29
30 #include <sys/param.h>
31 #include <sys/kernel.h>
32 #include <sys/systm.h>
33 #include <sys/malloc.h>
34 #include <sys/proc.h>
35 #include <sys/nlookup.h>
36 #include <sys/fcntl.h>
37 #include <sys/vnode.h>
38 #include <sys/linker.h>
39 #include <machine/elf.h>
40
41 #include <vm/vm.h>
42 #include <vm/vm_param.h>
43 #include <vm/vm_zone.h>
44 #include <vm/vm_object.h>
45 #include <vm/vm_kern.h>
46 #include <vm/vm_extern.h>
47 #include <sys/lock.h>
48 #include <vm/pmap.h>
49 #include <vm/vm_map.h>
50
51 static int      link_elf_obj_preload_file(const char *, linker_file_t *);
52 static int      link_elf_obj_preload_finish(linker_file_t);
53 static int      link_elf_obj_load_file(const char *, linker_file_t *);
54 static int
55 link_elf_obj_lookup_symbol(linker_file_t, const char *,
56                        c_linker_sym_t *);
57 static int      link_elf_obj_symbol_values(linker_file_t, c_linker_sym_t, linker_symval_t *);
58 static int
59 link_elf_obj_search_symbol(linker_file_t, caddr_t value,
60                        c_linker_sym_t * sym, long *diffp);
61
62 static void     link_elf_obj_unload_file(linker_file_t);
63 static int
64 link_elf_obj_lookup_set(linker_file_t, const char *,
65                     void ***, void ***, int *);
66 static void     link_elf_obj_reloc_local(linker_file_t lf);
67 static int elf_obj_lookup(linker_file_t lf, Elf_Size symidx, int deps, Elf_Addr *);
68
69 static struct linker_class_ops link_elf_obj_class_ops = {
70         link_elf_obj_load_file,
71         link_elf_obj_preload_file,
72 };
73
74 static struct linker_file_ops link_elf_obj_file_ops = {
75         .lookup_symbol = link_elf_obj_lookup_symbol,
76         .symbol_values = link_elf_obj_symbol_values,
77         .search_symbol = link_elf_obj_search_symbol,
78         .preload_finish = link_elf_obj_preload_finish,
79         .unload = link_elf_obj_unload_file,
80         .lookup_set = link_elf_obj_lookup_set,
81 };
82
83 typedef struct {
84         void           *addr;
85         Elf_Off         size;
86         int             flags;
87         int             sec;            /* Original section */
88         char           *name;
89 }               Elf_progent;
90
91 typedef struct {
92         Elf_Rel        *rel;
93         int             nrel;
94         int             sec;
95 }               Elf_relent;
96
97 typedef struct {
98         Elf_Rela       *rela;
99         int             nrela;
100         int             sec;
101 }               Elf_relaent;
102
103
104 typedef struct elf_file {
105         int             preloaded;
106
107         caddr_t         address;        /* Relocation address */
108         size_t          bytes;          /* Chunk size in bytes */
109         vm_object_t     object;         /* VM object to hold file pages */
110         Elf_Shdr       *e_shdr;
111
112         Elf_progent    *progtab;
113         int             nprogtab;
114
115         Elf_relaent    *relatab;
116         int             nrelatab;
117
118         Elf_relent     *reltab;
119         int             nreltab;
120
121         Elf_Sym        *ddbsymtab;      /* The symbol table we are using */
122         long            ddbsymcnt;      /* Number of symbols */
123         caddr_t         ddbstrtab;      /* String table */
124         long            ddbstrcnt;      /* number of bytes in string table */
125
126         caddr_t         shstrtab;       /* Section name string table */
127         long            shstrcnt;       /* number of bytes in string table */
128
129         caddr_t         ctftab;         /* CTF table */
130         long            ctfcnt;         /* number of bytes in CTF table */
131         caddr_t         ctfoff;         /* CTF offset table */
132         caddr_t         typoff;         /* Type offset table */
133         long            typlen;         /* Number of type entries. */
134
135 }              *elf_file_t;
136
137 static int      relocate_file(linker_file_t lf);
138
139 /*
140  * The kernel symbol table starts here.
141  */
142 extern struct _dynamic _DYNAMIC;
143
144 static void
145 link_elf_obj_init(void *arg)
146 {
147 #if ELF_TARG_CLASS == ELFCLASS32
148         linker_add_class("elf32", NULL, &link_elf_obj_class_ops);
149 #else
150         linker_add_class("elf64", NULL, &link_elf_obj_class_ops);
151 #endif
152 }
153
154 SYSINIT(link_elf, SI_BOOT2_KLD, SI_ORDER_SECOND, link_elf_obj_init, 0);
155
156 static void
157 link_elf_obj_error(const char *file, const char *s)
158 {
159         kprintf("kldload: %s: %s\n", file, s);
160 }
161
162 static int
163 link_elf_obj_preload_file(const char *filename, linker_file_t *result)
164 {
165         Elf_Ehdr       *hdr;
166         Elf_Shdr       *shdr;
167         Elf_Sym *es;
168         caddr_t         modptr, baseptr, sizeptr;
169         char           *type;
170         elf_file_t      ef;
171         linker_file_t   lf;
172         Elf_Addr        off;
173         int             error, i, j, pb, ra, rl, shstrindex, symstrindex, symtabindex;
174
175         /*
176          * Look to see if we have the module preloaded.
177          */
178         modptr = preload_search_by_name(filename);
179         if (modptr == NULL)
180                 return ENOENT;
181
182         /* It's preloaded, check we can handle it and collect information */
183         type = (char *)preload_search_info(modptr, MODINFO_TYPE);
184         baseptr = preload_search_info(modptr, MODINFO_ADDR);
185         sizeptr = preload_search_info(modptr, MODINFO_SIZE);
186         hdr = (Elf_Ehdr *) preload_search_info(modptr, MODINFO_METADATA |
187                                                MODINFOMD_ELFHDR);
188         shdr = (Elf_Shdr *) preload_search_info(modptr, MODINFO_METADATA |
189                                                 MODINFOMD_SHDR);
190         if (type == NULL ||
191             (strcmp(type, "elf" __XSTRING(__ELF_WORD_SIZE) " obj module") != 0 &&
192              strcmp(type, "elf obj module") != 0)) {
193                 return (EFTYPE);
194         }
195         if (baseptr == NULL || sizeptr == NULL || hdr == NULL || shdr == NULL)
196                 return (EINVAL);
197
198         ef = kmalloc(sizeof(struct elf_file), M_LINKER, M_WAITOK | M_ZERO);
199         ef->preloaded = 1;
200         ef->address = *(caddr_t *) baseptr;
201         ef->bytes = 0;
202         lf = linker_make_file(filename, ef, &link_elf_obj_file_ops);
203         if (lf == NULL) {
204                 kfree(ef, M_LINKER);
205                 return ENOMEM;
206         }
207         lf->address = ef->address;
208         lf->size = *(size_t *) sizeptr;
209
210         if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS ||
211             hdr->e_ident[EI_DATA] != ELF_TARG_DATA ||
212             hdr->e_ident[EI_VERSION] != EV_CURRENT ||
213             hdr->e_version != EV_CURRENT ||
214             hdr->e_type != ET_REL ||
215             hdr->e_machine != ELF_TARG_MACH) {
216                 error = EFTYPE;
217                 goto out;
218         }
219         ef->e_shdr = shdr;
220
221         /* Scan the section header for information and table sizing. */
222         symtabindex = -1;
223         symstrindex = -1;
224         for (i = 0; i < hdr->e_shnum; i++) {
225                 switch (shdr[i].sh_type) {
226                 case SHT_PROGBITS:
227                 case SHT_NOBITS:
228                         ef->nprogtab++;
229                         break;
230                 case SHT_SYMTAB:
231                         symtabindex = i;
232                         symstrindex = shdr[i].sh_link;
233                         break;
234                 case SHT_REL:
235                         ef->nreltab++;
236                         break;
237                 case SHT_RELA:
238                         ef->nrelatab++;
239                         break;
240                 }
241         }
242
243         shstrindex = hdr->e_shstrndx;
244         if (ef->nprogtab == 0 || symstrindex < 0 ||
245             symstrindex >= hdr->e_shnum ||
246             shdr[symstrindex].sh_type != SHT_STRTAB || shstrindex == 0 ||
247             shstrindex >= hdr->e_shnum ||
248             shdr[shstrindex].sh_type != SHT_STRTAB) {
249                 error = ENOEXEC;
250                 goto out;
251         }
252         /* Allocate space for tracking the load chunks */
253         if (ef->nprogtab != 0)
254                 ef->progtab = kmalloc(ef->nprogtab * sizeof(*ef->progtab),
255                                      M_LINKER, M_WAITOK | M_ZERO);
256         if (ef->nreltab != 0)
257                 ef->reltab = kmalloc(ef->nreltab * sizeof(*ef->reltab),
258                                     M_LINKER, M_WAITOK | M_ZERO);
259         if (ef->nrelatab != 0)
260                 ef->relatab = kmalloc(ef->nrelatab * sizeof(*ef->relatab),
261                                      M_LINKER, M_WAITOK | M_ZERO);
262         if ((ef->nprogtab != 0 && ef->progtab == NULL) ||
263             (ef->nreltab != 0 && ef->reltab == NULL) ||
264             (ef->nrelatab != 0 && ef->relatab == NULL)) {
265                 error = ENOMEM;
266                 goto out;
267         }
268         /* XXX, relocate the sh_addr fields saved by the loader. */
269         off = 0;
270         for (i = 0; i < hdr->e_shnum; i++) {
271                 if (shdr[i].sh_addr != 0 && (off == 0 || shdr[i].sh_addr < off))
272                         off = shdr[i].sh_addr;
273         }
274         for (i = 0; i < hdr->e_shnum; i++) {
275                 if (shdr[i].sh_addr != 0)
276                         shdr[i].sh_addr = shdr[i].sh_addr - off +
277                                 (Elf_Addr) ef->address;
278         }
279
280         ef->ddbsymcnt = shdr[symtabindex].sh_size / sizeof(Elf_Sym);
281         ef->ddbsymtab = (Elf_Sym *) shdr[symtabindex].sh_addr;
282         ef->ddbstrcnt = shdr[symstrindex].sh_size;
283         ef->ddbstrtab = (char *)shdr[symstrindex].sh_addr;
284         ef->shstrcnt = shdr[shstrindex].sh_size;
285         ef->shstrtab = (char *)shdr[shstrindex].sh_addr;
286
287         /* Now fill out progtab and the relocation tables. */
288         pb = 0;
289         rl = 0;
290         ra = 0;
291         for (i = 0; i < hdr->e_shnum; i++) {
292                 switch (shdr[i].sh_type) {
293                 case SHT_PROGBITS:
294                 case SHT_NOBITS:
295                         ef->progtab[pb].addr = (void *)shdr[i].sh_addr;
296                         if (shdr[i].sh_type == SHT_PROGBITS)
297                                 ef->progtab[pb].name = "<<PROGBITS>>";
298                         else
299                                 ef->progtab[pb].name = "<<NOBITS>>";
300                         ef->progtab[pb].size = shdr[i].sh_size;
301                         ef->progtab[pb].sec = i;
302                         if (ef->shstrtab && shdr[i].sh_name != 0)
303                                 ef->progtab[pb].name =
304                                         ef->shstrtab + shdr[i].sh_name;
305 #if 0
306                         if (ef->progtab[pb].name != NULL &&
307                             !strcmp(ef->progtab[pb].name, "set_pcpu")) {
308                                 void           *dpcpu;
309
310                                 dpcpu = dpcpu_alloc(shdr[i].sh_size);
311                                 if (dpcpu == NULL) {
312                                         error = ENOSPC;
313                                         goto out;
314                                 }
315                                 memcpy(dpcpu, ef->progtab[pb].addr,
316                                        ef->progtab[pb].size);
317                                 dpcpu_copy(dpcpu, shdr[i].sh_size);
318                                 ef->progtab[pb].addr = dpcpu;
319 #ifdef VIMAGE
320                         } else if (ef->progtab[pb].name != NULL &&
321                                    !strcmp(ef->progtab[pb].name, VNET_SETNAME)) {
322                                 void           *vnet_data;
323
324                                 vnet_data = vnet_data_alloc(shdr[i].sh_size);
325                                 if (vnet_data == NULL) {
326                                         error = ENOSPC;
327                                         goto out;
328                                 }
329                                 memcpy(vnet_data, ef->progtab[pb].addr,
330                                        ef->progtab[pb].size);
331                                 vnet_data_copy(vnet_data, shdr[i].sh_size);
332                                 ef->progtab[pb].addr = vnet_data;
333 #endif
334                         }
335 #endif
336                         /* Update all symbol values with the offset. */
337                         for (j = 0; j < ef->ddbsymcnt; j++) {
338                                 es = &ef->ddbsymtab[j];
339                                 if (es->st_shndx != i)
340                                         continue;
341                                 es->st_value += (Elf_Addr) ef->progtab[pb].addr;
342                         }
343                         pb++;
344                         break;
345                 case SHT_REL:
346                         ef->reltab[rl].rel = (Elf_Rel *) shdr[i].sh_addr;
347                         ef->reltab[rl].nrel = shdr[i].sh_size / sizeof(Elf_Rel);
348                         ef->reltab[rl].sec = shdr[i].sh_info;
349                         rl++;
350                         break;
351                 case SHT_RELA:
352                         ef->relatab[ra].rela = (Elf_Rela *) shdr[i].sh_addr;
353                         ef->relatab[ra].nrela =
354                                 shdr[i].sh_size / sizeof(Elf_Rela);
355                         ef->relatab[ra].sec = shdr[i].sh_info;
356                         ra++;
357                         break;
358                 }
359         }
360         if (pb != ef->nprogtab)
361                 panic("lost progbits");
362         if (rl != ef->nreltab)
363                 panic("lost reltab");
364         if (ra != ef->nrelatab)
365                 panic("lost relatab");
366
367         /* Local intra-module relocations */
368         link_elf_obj_reloc_local(lf);
369
370         *result = lf;
371         return (0);
372
373 out:
374         /* preload not done this way */
375         linker_file_unload(lf /* , LINKER_UNLOAD_FORCE */ );
376         return (error);
377 }
378
379 static int
380 link_elf_obj_preload_finish(linker_file_t lf)
381 {
382         int error;
383
384         error = relocate_file(lf);
385
386         return (error);
387 }
388
389 static int
390 link_elf_obj_load_file(const char *filename, linker_file_t * result)
391 {
392         struct nlookupdata nd;
393         struct thread  *td = curthread; /* XXX */
394         struct proc    *p = td->td_proc;
395         char           *pathname;
396         struct vnode   *vp;
397         Elf_Ehdr       *hdr;
398         Elf_Shdr       *shdr;
399         Elf_Sym        *es;
400         int             nbytes, i, j;
401         vm_offset_t     mapbase;
402         size_t          mapsize;
403         int             error = 0;
404         int             resid;
405         elf_file_t      ef;
406         linker_file_t   lf;
407         int             symtabindex;
408         int             symstrindex;
409         int             shstrindex;
410         int             nsym;
411         int             pb, rl, ra;
412         int             alignmask;
413
414         /* XXX Hack for firmware loading where p == NULL */
415         if (p == NULL) {
416                 p = &proc0;
417         }
418
419         KKASSERT(p != NULL);
420         if (p->p_ucred == NULL) {
421                 kprintf("link_elf_obj_load_file: cannot load '%s' from filesystem"
422                         " this early\n", filename);
423                 return ENOENT;
424         }
425         shdr = NULL;
426         lf = NULL;
427         mapsize = 0;
428         hdr = NULL;
429         pathname = linker_search_path(filename);
430         if (pathname == NULL)
431                 return ENOENT;
432
433         error = nlookup_init(&nd, pathname, UIO_SYSSPACE, NLC_FOLLOW | NLC_LOCKVP);
434         if (error == 0)
435                 error = vn_open(&nd, NULL, FREAD, 0);
436         kfree(pathname, M_LINKER);
437         if (error) {
438                 nlookup_done(&nd);
439                 return error;
440         }
441         vp = nd.nl_open_vp;
442         nd.nl_open_vp = NULL;
443         nlookup_done(&nd);
444
445         /*
446          * Read the elf header from the file.
447          */
448         hdr = kmalloc(sizeof(*hdr), M_LINKER, M_WAITOK);
449         error = vn_rdwr(UIO_READ, vp, (void *)hdr, sizeof(*hdr), 0,
450                         UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
451         if (error)
452                 goto out;
453         if (resid != 0) {
454                 error = ENOEXEC;
455                 goto out;
456         }
457         if (!IS_ELF(*hdr)) {
458                 error = ENOEXEC;
459                 goto out;
460         }
461
462         if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS
463             || hdr->e_ident[EI_DATA] != ELF_TARG_DATA) {
464                 link_elf_obj_error(filename, "Unsupported file layout");
465                 error = ENOEXEC;
466                 goto out;
467         }
468         if (hdr->e_ident[EI_VERSION] != EV_CURRENT
469             || hdr->e_version != EV_CURRENT) {
470                 link_elf_obj_error(filename, "Unsupported file version");
471                 error = ENOEXEC;
472                 goto out;
473         }
474         if (hdr->e_type != ET_REL) {
475                 error = ENOSYS;
476                 goto out;
477         }
478         if (hdr->e_machine != ELF_TARG_MACH) {
479                 link_elf_obj_error(filename, "Unsupported machine");
480                 error = ENOEXEC;
481                 goto out;
482         }
483
484         ef = kmalloc(sizeof(struct elf_file), M_LINKER, M_WAITOK | M_ZERO);
485         lf = linker_make_file(filename, ef, &link_elf_obj_file_ops);
486         if (lf == NULL) {
487                 kfree(ef, M_LINKER);
488                 error = ENOMEM;
489                 goto out;
490         }
491         ef->nprogtab = 0;
492         ef->e_shdr = NULL;
493         ef->nreltab = 0;
494         ef->nrelatab = 0;
495
496         /* Allocate and read in the section header */
497         nbytes = hdr->e_shnum * hdr->e_shentsize;
498         if (nbytes == 0 || hdr->e_shoff == 0 ||
499             hdr->e_shentsize != sizeof(Elf_Shdr)) {
500                 error = ENOEXEC;
501                 goto out;
502         }
503         shdr = kmalloc(nbytes, M_LINKER, M_WAITOK);
504         ef->e_shdr = shdr;
505         error = vn_rdwr(UIO_READ, vp, (caddr_t) shdr, nbytes, hdr->e_shoff,
506                         UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
507         if (error)
508                 goto out;
509         if (resid) {
510                 error = ENOEXEC;
511                 goto out;
512         }
513         /* Scan the section header for information and table sizing. */
514         nsym = 0;
515         symtabindex = -1;
516         symstrindex = -1;
517         for (i = 0; i < hdr->e_shnum; i++) {
518                 switch (shdr[i].sh_type) {
519                 case SHT_PROGBITS:
520                 case SHT_NOBITS:
521                         ef->nprogtab++;
522                         break;
523                 case SHT_SYMTAB:
524                         nsym++;
525                         symtabindex = i;
526                         symstrindex = shdr[i].sh_link;
527                         break;
528                 case SHT_REL:
529                         ef->nreltab++;
530                         break;
531                 case SHT_RELA:
532                         ef->nrelatab++;
533                         break;
534                 case SHT_STRTAB:
535                         break;
536                 }
537         }
538         if (ef->nprogtab == 0) {
539                 link_elf_obj_error(filename, "file has no contents");
540                 error = ENOEXEC;
541                 goto out;
542         }
543         if (nsym != 1) {
544                 /* Only allow one symbol table for now */
545                 link_elf_obj_error(filename, "file has no valid symbol table");
546                 error = ENOEXEC;
547                 goto out;
548         }
549         if (symstrindex < 0 || symstrindex > hdr->e_shnum ||
550             shdr[symstrindex].sh_type != SHT_STRTAB) {
551                 link_elf_obj_error(filename, "file has invalid symbol strings");
552                 error = ENOEXEC;
553                 goto out;
554         }
555         /* Allocate space for tracking the load chunks */
556         if (ef->nprogtab != 0)
557                 ef->progtab = kmalloc(ef->nprogtab * sizeof(*ef->progtab),
558                                       M_LINKER, M_WAITOK | M_ZERO);
559         if (ef->nreltab != 0)
560                 ef->reltab = kmalloc(ef->nreltab * sizeof(*ef->reltab),
561                                      M_LINKER, M_WAITOK | M_ZERO);
562         if (ef->nrelatab != 0)
563                 ef->relatab = kmalloc(ef->nrelatab * sizeof(*ef->relatab),
564                                       M_LINKER, M_WAITOK | M_ZERO);
565         if ((ef->nprogtab != 0 && ef->progtab == NULL) ||
566             (ef->nreltab != 0 && ef->reltab == NULL) ||
567             (ef->nrelatab != 0 && ef->relatab == NULL)) {
568                 error = ENOMEM;
569                 goto out;
570         }
571         if (symtabindex == -1)
572                 panic("lost symbol table index");
573         /* Allocate space for and load the symbol table */
574         ef->ddbsymcnt = shdr[symtabindex].sh_size / sizeof(Elf_Sym);
575         ef->ddbsymtab = kmalloc(shdr[symtabindex].sh_size, M_LINKER, M_WAITOK);
576         error = vn_rdwr(UIO_READ, vp, (void *)ef->ddbsymtab,
577                         shdr[symtabindex].sh_size, shdr[symtabindex].sh_offset,
578                         UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
579         if (error)
580                 goto out;
581         if (resid != 0) {
582                 error = EINVAL;
583                 goto out;
584         }
585         if (symstrindex == -1)
586                 panic("lost symbol string index");
587         /* Allocate space for and load the symbol strings */
588         ef->ddbstrcnt = shdr[symstrindex].sh_size;
589         ef->ddbstrtab = kmalloc(shdr[symstrindex].sh_size, M_LINKER, M_WAITOK);
590         error = vn_rdwr(UIO_READ, vp, ef->ddbstrtab,
591                         shdr[symstrindex].sh_size, shdr[symstrindex].sh_offset,
592                         UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
593         if (error)
594                 goto out;
595         if (resid != 0) {
596                 error = EINVAL;
597                 goto out;
598         }
599         /* Do we have a string table for the section names?  */
600         shstrindex = -1;
601         if (hdr->e_shstrndx != 0 &&
602             shdr[hdr->e_shstrndx].sh_type == SHT_STRTAB) {
603                 shstrindex = hdr->e_shstrndx;
604                 ef->shstrcnt = shdr[shstrindex].sh_size;
605                 ef->shstrtab = kmalloc(shdr[shstrindex].sh_size, M_LINKER,
606                                        M_WAITOK);
607                 error = vn_rdwr(UIO_READ, vp, ef->shstrtab,
608                                 shdr[shstrindex].sh_size, shdr[shstrindex].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         }
617         /* Size up code/data(progbits) and bss(nobits). */
618         alignmask = 0;
619         for (i = 0; i < hdr->e_shnum; i++) {
620                 switch (shdr[i].sh_type) {
621                 case SHT_PROGBITS:
622                 case SHT_NOBITS:
623                         alignmask = shdr[i].sh_addralign - 1;
624                         if (alignmask == -1)
625                                 alignmask = 0;
626                         mapsize += alignmask;
627                         mapsize &= ~alignmask;
628                         mapsize += shdr[i].sh_size;
629                         break;
630                 }
631         }
632
633         /*
634          * We know how much space we need for the text/data/bss/etc. This
635          * stuff needs to be in a single chunk so that profiling etc can get
636          * the bounds and gdb can associate offsets with modules
637          */
638         ef->object = vm_object_allocate(OBJT_DEFAULT,
639                                         round_page(mapsize) >> PAGE_SHIFT);
640         if (ef->object == NULL) {
641                 error = ENOMEM;
642                 goto out;
643         }
644         vm_object_hold(ef->object);
645         vm_object_reference_locked(ef->object);
646         ef->address = (caddr_t) vm_map_min(&kernel_map);
647         ef->bytes = 0;
648
649         /*
650          * In order to satisfy x86_64's architectural requirements on the
651          * location of code and data in the kernel's address space, request a
652          * mapping that is above the kernel.
653          *
654          * vkernel64's text+data is outside the managed VM space entirely.
655          */
656 #if defined(__x86_64__) && defined(_KERNEL_VIRTUAL)
657         error = vkernel_module_memory_alloc(&mapbase, round_page(mapsize));
658         vm_object_drop(ef->object);
659 #else
660         mapbase = KERNBASE;
661         error = vm_map_find(&kernel_map, ef->object, NULL,
662                             0, &mapbase, round_page(mapsize),
663                             PAGE_SIZE,
664                             TRUE, VM_MAPTYPE_NORMAL,
665                             VM_PROT_ALL, VM_PROT_ALL, FALSE);
666         vm_object_drop(ef->object);
667         if (error) {
668                 vm_object_deallocate(ef->object);
669                 ef->object = NULL;
670                 goto out;
671         }
672         /* Wire the pages */
673         error = vm_map_wire(&kernel_map, mapbase,
674                             mapbase + round_page(mapsize), 0);
675 #endif
676         if (error != KERN_SUCCESS) {
677                 error = ENOMEM;
678                 goto out;
679         }
680         /* Inform the kld system about the situation */
681         lf->address = ef->address = (caddr_t) mapbase;
682         lf->size = round_page(mapsize);
683         ef->bytes = mapsize;
684
685         /*
686          * Now load code/data(progbits), zero bss(nobits), allocate space for
687          * and load relocs
688          */
689         pb = 0;
690         rl = 0;
691         ra = 0;
692         alignmask = 0;
693         for (i = 0; i < hdr->e_shnum; i++) {
694                 switch (shdr[i].sh_type) {
695                 case SHT_PROGBITS:
696                 case SHT_NOBITS:
697                         alignmask = shdr[i].sh_addralign - 1;
698                         if (alignmask == -1)
699                                 alignmask = 0;
700                         alignmask = shdr[i].sh_addralign - 1;
701                         mapbase += alignmask;
702                         mapbase &= ~alignmask;
703                         if (ef->shstrtab && shdr[i].sh_name != 0)
704                                 ef->progtab[pb].name =
705                                         ef->shstrtab + shdr[i].sh_name;
706                         else if (shdr[i].sh_type == SHT_PROGBITS)
707                                 ef->progtab[pb].name = "<<PROGBITS>>";
708                         else
709                                 ef->progtab[pb].name = "<<NOBITS>>";
710 #if 0
711                         if (ef->progtab[pb].name != NULL &&
712                             !strcmp(ef->progtab[pb].name, "set_pcpu"))
713                                 ef->progtab[pb].addr =
714                                         dpcpu_alloc(shdr[i].sh_size);
715 #ifdef VIMAGE
716                         else if (ef->progtab[pb].name != NULL &&
717                                  !strcmp(ef->progtab[pb].name, VNET_SETNAME))
718                                 ef->progtab[pb].addr =
719                                         vnet_data_alloc(shdr[i].sh_size);
720 #endif
721                         else
722 #endif
723                                 ef->progtab[pb].addr =
724                                         (void *)(uintptr_t) mapbase;
725                         if (ef->progtab[pb].addr == NULL) {
726                                 error = ENOSPC;
727                                 goto out;
728                         }
729                         ef->progtab[pb].size = shdr[i].sh_size;
730                         ef->progtab[pb].sec = i;
731                         if (shdr[i].sh_type == SHT_PROGBITS) {
732                                 error = vn_rdwr(UIO_READ, vp,
733                                                 ef->progtab[pb].addr,
734                                                 shdr[i].sh_size, shdr[i].sh_offset,
735                                                 UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred,
736                                                 &resid);
737                                 if (error)
738                                         goto out;
739                                 if (resid != 0) {
740                                         error = EINVAL;
741                                         goto out;
742                                 }
743 #if 0
744                                 /* Initialize the per-cpu or vnet area. */
745                                 if (ef->progtab[pb].addr != (void *)mapbase &&
746                                     !strcmp(ef->progtab[pb].name, "set_pcpu"))
747                                         dpcpu_copy(ef->progtab[pb].addr,
748                                                    shdr[i].sh_size);
749 #ifdef VIMAGE
750                                 else if (ef->progtab[pb].addr !=
751                                          (void *)mapbase &&
752                                          !strcmp(ef->progtab[pb].name, VNET_SETNAME))
753                                         vnet_data_copy(ef->progtab[pb].addr,
754                                                        shdr[i].sh_size);
755 #endif
756 #endif
757                         } else
758                                 bzero(ef->progtab[pb].addr, shdr[i].sh_size);
759
760                         /* Update all symbol values with the offset. */
761                         for (j = 0; j < ef->ddbsymcnt; j++) {
762                                 es = &ef->ddbsymtab[j];
763                                 if (es->st_shndx != i)
764                                         continue;
765                                 es->st_value += (Elf_Addr) ef->progtab[pb].addr;
766                         }
767                         mapbase += shdr[i].sh_size;
768                         pb++;
769                         break;
770                 case SHT_REL:
771                         ef->reltab[rl].rel = kmalloc(shdr[i].sh_size, M_LINKER, M_WAITOK);
772                         ef->reltab[rl].nrel = shdr[i].sh_size / sizeof(Elf_Rel);
773                         ef->reltab[rl].sec = shdr[i].sh_info;
774                         error = vn_rdwr(UIO_READ, vp,
775                                         (void *)ef->reltab[rl].rel,
776                                         shdr[i].sh_size, shdr[i].sh_offset,
777                                         UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
778                         if (error)
779                                 goto out;
780                         if (resid != 0) {
781                                 error = EINVAL;
782                                 goto out;
783                         }
784                         rl++;
785                         break;
786                 case SHT_RELA:
787                         ef->relatab[ra].rela = kmalloc(shdr[i].sh_size, M_LINKER, M_WAITOK);
788                         ef->relatab[ra].nrela = shdr[i].sh_size / sizeof(Elf_Rela);
789                         ef->relatab[ra].sec = shdr[i].sh_info;
790                         error = vn_rdwr(UIO_READ, vp,
791                                         (void *)ef->relatab[ra].rela,
792                                         shdr[i].sh_size, shdr[i].sh_offset,
793                                         UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
794                         if (error)
795                                 goto out;
796                         if (resid != 0) {
797                                 error = EINVAL;
798                                 goto out;
799                         }
800                         ra++;
801                         break;
802                 }
803         }
804         if (pb != ef->nprogtab)
805                 panic("lost progbits");
806         if (rl != ef->nreltab)
807                 panic("lost reltab");
808         if (ra != ef->nrelatab)
809                 panic("lost relatab");
810         if (mapbase != (vm_offset_t) ef->address + mapsize)
811                 panic("mapbase 0x%lx != address %p + mapsize 0x%lx (0x%lx)",
812                       mapbase, ef->address, mapsize,
813                       (vm_offset_t) ef->address + mapsize);
814
815         /* Local intra-module relocations */
816         link_elf_obj_reloc_local(lf);
817
818         /* Pull in dependencies */
819         error = linker_load_dependencies(lf);
820         if (error)
821                 goto out;
822
823         /* External relocations */
824         error = relocate_file(lf);
825         if (error)
826                 goto out;
827
828         *result = lf;
829
830 out:
831         if (error && lf)
832                 linker_file_unload(lf /*, LINKER_UNLOAD_FORCE */);
833         if (hdr)
834                 kfree(hdr, M_LINKER);
835         vn_unlock(vp);
836         vn_close(vp, FREAD, NULL);
837
838         return error;
839 }
840
841 static void
842 link_elf_obj_unload_file(linker_file_t file)
843 {
844         elf_file_t      ef = file->priv;
845         int i;
846
847         if (ef->progtab) {
848                 for (i = 0; i < ef->nprogtab; i++) {
849                         if (ef->progtab[i].size == 0)
850                                 continue;
851                         if (ef->progtab[i].name == NULL)
852                                 continue;
853 #if 0
854                         if (!strcmp(ef->progtab[i].name, "set_pcpu"))
855                                 dpcpu_free(ef->progtab[i].addr,
856                                     ef->progtab[i].size);
857 #ifdef VIMAGE
858                         else if (!strcmp(ef->progtab[i].name, VNET_SETNAME))
859                                 vnet_data_free(ef->progtab[i].addr,
860                                     ef->progtab[i].size);
861 #endif
862 #endif
863                 }
864         }
865         if (ef->preloaded) {
866                 if (ef->reltab)
867                         kfree(ef->reltab, M_LINKER);
868                 if (ef->relatab)
869                         kfree(ef->relatab, M_LINKER);
870                 if (ef->progtab)
871                         kfree(ef->progtab, M_LINKER);
872                 if (ef->ctftab)
873                         kfree(ef->ctftab, M_LINKER);
874                 if (ef->ctfoff)
875                         kfree(ef->ctfoff, M_LINKER);
876                 if (ef->typoff)
877                         kfree(ef->typoff, M_LINKER);
878                 if (file->filename != NULL)
879                         preload_delete_name(file->filename);
880                 kfree(ef, M_LINKER);
881                 /* XXX reclaim module memory? */
882                 return;
883         }
884
885         for (i = 0; i < ef->nreltab; i++)
886                 if (ef->reltab[i].rel)
887                         kfree(ef->reltab[i].rel, M_LINKER);
888         for (i = 0; i < ef->nrelatab; i++)
889                 if (ef->relatab[i].rela)
890                         kfree(ef->relatab[i].rela, M_LINKER);
891         if (ef->reltab)
892                 kfree(ef->reltab, M_LINKER);
893         if (ef->relatab)
894                 kfree(ef->relatab, M_LINKER);
895         if (ef->progtab)
896                 kfree(ef->progtab, M_LINKER);
897
898         if (ef->object) {
899 #if defined(__x86_64__) && defined(_KERNEL_VIRTUAL)
900                 vkernel_module_memory_free((vm_offset_t)ef->address, ef->bytes);
901 #else
902                 vm_map_remove(&kernel_map, (vm_offset_t) ef->address,
903                     (vm_offset_t) ef->address +
904                     (ef->object->size << PAGE_SHIFT));
905 #endif
906                 vm_object_deallocate(ef->object);
907                 ef->object = NULL;
908         }
909         if (ef->e_shdr)
910                 kfree(ef->e_shdr, M_LINKER);
911         if (ef->ddbsymtab)
912                 kfree(ef->ddbsymtab, M_LINKER);
913         if (ef->ddbstrtab)
914                 kfree(ef->ddbstrtab, M_LINKER);
915         if (ef->shstrtab)
916                 kfree(ef->shstrtab, M_LINKER);
917         if (ef->ctftab)
918                 kfree(ef->ctftab, M_LINKER);
919         if (ef->ctfoff)
920                 kfree(ef->ctfoff, M_LINKER);
921         if (ef->typoff)
922                 kfree(ef->typoff, M_LINKER);
923         kfree(ef, M_LINKER);
924 }
925
926 static const char *
927 symbol_name(elf_file_t ef, Elf_Size r_info)
928 {
929         const Elf_Sym  *ref;
930
931         if (ELF_R_SYM(r_info)) {
932                 ref = ef->ddbsymtab + ELF_R_SYM(r_info);
933                 return ef->ddbstrtab + ref->st_name;
934         } else
935                 return NULL;
936 }
937
938 static Elf_Addr
939 findbase(elf_file_t ef, int sec)
940 {
941         int i;
942         Elf_Addr base = 0;
943
944         for (i = 0; i < ef->nprogtab; i++) {
945                 if (sec == ef->progtab[i].sec) {
946                         base = (Elf_Addr)ef->progtab[i].addr;
947                         break;
948                 }
949         }
950         return base;
951 }
952
953 static int
954 relocate_file(linker_file_t lf)
955 {
956         elf_file_t      ef = lf->priv;
957         const Elf_Rel *rellim;
958         const Elf_Rel *rel;
959         const Elf_Rela *relalim;
960         const Elf_Rela *rela;
961         const char *symname;
962         const Elf_Sym *sym;
963         int i;
964         Elf_Size symidx;
965         Elf_Addr base;
966
967         /* Perform relocations without addend if there are any: */
968         for (i = 0; i < ef->nreltab; i++) {
969                 rel = ef->reltab[i].rel;
970                 if (rel == NULL)
971                         panic("lost a reltab!");
972                 rellim = rel + ef->reltab[i].nrel;
973                 base = findbase(ef, ef->reltab[i].sec);
974                 if (base == 0)
975                         panic("lost base for reltab");
976                 for ( ; rel < rellim; rel++) {
977                         symidx = ELF_R_SYM(rel->r_info);
978                         if (symidx >= ef->ddbsymcnt)
979                                 continue;
980                         sym = ef->ddbsymtab + symidx;
981                         /* Local relocs are already done */
982                         if (ELF_ST_BIND(sym->st_info) == STB_LOCAL)
983                                 continue;
984                         if (elf_reloc(lf, base, rel, ELF_RELOC_REL,
985                             elf_obj_lookup)) {
986                                 symname = symbol_name(ef, rel->r_info);
987                                 kprintf("link_elf_obj_obj: symbol %s undefined\n",
988                                     symname);
989                                 return ENOENT;
990                         }
991                 }
992         }
993
994         /* Perform relocations with addend if there are any: */
995         for (i = 0; i < ef->nrelatab; i++) {
996                 rela = ef->relatab[i].rela;
997                 if (rela == NULL)
998                         panic("lost a relatab!");
999                 relalim = rela + ef->relatab[i].nrela;
1000                 base = findbase(ef, ef->relatab[i].sec);
1001                 if (base == 0)
1002                         panic("lost base for relatab");
1003                 for ( ; rela < relalim; rela++) {
1004                         symidx = ELF_R_SYM(rela->r_info);
1005                         if (symidx >= ef->ddbsymcnt)
1006                                 continue;
1007                         sym = ef->ddbsymtab + symidx;
1008                         /* Local relocs are already done */
1009                         if (ELF_ST_BIND(sym->st_info) == STB_LOCAL)
1010                                 continue;
1011                         if (elf_reloc(lf, base, rela, ELF_RELOC_RELA,
1012                             elf_obj_lookup)) {
1013                                 symname = symbol_name(ef, rela->r_info);
1014                                 kprintf("link_elf_obj_obj: symbol %s undefined\n",
1015                                     symname);
1016                                 return ENOENT;
1017                         }
1018                 }
1019         }
1020
1021         return 0;
1022 }
1023
1024 static int
1025 link_elf_obj_lookup_symbol(linker_file_t lf, const char *name, c_linker_sym_t *sym)
1026 {
1027         elf_file_t ef = lf->priv;
1028         const Elf_Sym *symp;
1029         const char *strp;
1030         int i;
1031
1032         for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) {
1033                 strp = ef->ddbstrtab + symp->st_name;
1034                 if (symp->st_shndx != SHN_UNDEF && strcmp(name, strp) == 0) {
1035                         *sym = (c_linker_sym_t) symp;
1036                         return 0;
1037                 }
1038         }
1039         return ENOENT;
1040 }
1041
1042 static int
1043 link_elf_obj_symbol_values(linker_file_t lf, c_linker_sym_t sym,
1044     linker_symval_t *symval)
1045 {
1046         elf_file_t ef = lf->priv;
1047         const Elf_Sym *es = (const Elf_Sym*) sym;
1048
1049         if (es >= ef->ddbsymtab && es < (ef->ddbsymtab + ef->ddbsymcnt)) {
1050                 symval->name = ef->ddbstrtab + es->st_name;
1051                 symval->value = (caddr_t)es->st_value;
1052                 symval->size = es->st_size;
1053                 return 0;
1054         }
1055         return ENOENT;
1056 }
1057
1058 static int
1059 link_elf_obj_search_symbol(linker_file_t lf, caddr_t value,
1060     c_linker_sym_t *sym, long *diffp)
1061 {
1062         elf_file_t ef = lf->priv;
1063         u_long off = (uintptr_t) (void *) value;
1064         u_long diff = off;
1065         u_long st_value;
1066         const Elf_Sym *es;
1067         const Elf_Sym *best = NULL;
1068         int i;
1069
1070         for (i = 0, es = ef->ddbsymtab; i < ef->ddbsymcnt; i++, es++) {
1071                 if (es->st_name == 0)
1072                         continue;
1073                 st_value = es->st_value;
1074                 if (off >= st_value) {
1075                         if (off - st_value < diff) {
1076                                 diff = off - st_value;
1077                                 best = es;
1078                                 if (diff == 0)
1079                                         break;
1080                         } else if (off - st_value == diff) {
1081                                 best = es;
1082                         }
1083                 }
1084         }
1085         if (best == NULL)
1086                 *diffp = off;
1087         else
1088                 *diffp = diff;
1089         *sym = (c_linker_sym_t) best;
1090
1091         return 0;
1092 }
1093
1094 /*
1095  * Look up a linker set on an ELF system.
1096  */
1097 static int
1098 link_elf_obj_lookup_set(linker_file_t lf, const char *name,
1099     void ***startp, void ***stopp, int *countp)
1100 {
1101         elf_file_t ef = lf->priv;
1102         void **start, **stop;
1103         int i, count;
1104
1105         /* Relative to section number */
1106         for (i = 0; i < ef->nprogtab; i++) {
1107                 if ((strncmp(ef->progtab[i].name, "set_", 4) == 0) &&
1108                     strcmp(ef->progtab[i].name + 4, name) == 0) {
1109                         start  = (void **)ef->progtab[i].addr;
1110                         stop = (void **)((char *)ef->progtab[i].addr +
1111                             ef->progtab[i].size);
1112                         count = stop - start;
1113                         if (startp)
1114                                 *startp = start;
1115                         if (stopp)
1116                                 *stopp = stop;
1117                         if (countp)
1118                                 *countp = count;
1119                         return (0);
1120                 }
1121         }
1122         return (ESRCH);
1123 }
1124
1125 /*
1126  * Symbol lookup function that can be used when the symbol index is known (ie
1127  * in relocations). It uses the symbol index instead of doing a fully fledged
1128  * hash table based lookup when such is valid. For example for local symbols.
1129  * This is not only more efficient, it's also more correct. It's not always
1130  * the case that the symbol can be found through the hash table.
1131  */
1132 static int
1133 elf_obj_lookup(linker_file_t lf, Elf_Size symidx, int deps, Elf_Addr *result)
1134 {
1135         elf_file_t ef = lf->priv;
1136         const Elf_Sym *sym;
1137         const char *symbol;
1138
1139         /* Don't even try to lookup the symbol if the index is bogus. */
1140         if (symidx >= ef->ddbsymcnt)
1141                 return (ENOENT);
1142
1143         sym = ef->ddbsymtab + symidx;
1144
1145         /* Quick answer if there is a definition included. */
1146         if (sym->st_shndx != SHN_UNDEF) {
1147                 *result = sym->st_value;
1148                 return (0);
1149         }
1150
1151         /* If we get here, then it is undefined and needs a lookup. */
1152         switch (ELF_ST_BIND(sym->st_info)) {
1153         case STB_LOCAL:
1154                 /* Local, but undefined? huh? */
1155                 return (ENOENT);
1156
1157         case STB_GLOBAL:
1158                 /* Relative to Data or Function name */
1159                 symbol = ef->ddbstrtab + sym->st_name;
1160
1161                 /* Force a lookup failure if the symbol name is bogus. */
1162                 if (*symbol == 0)
1163                         return (ENOENT);
1164                 return (linker_file_lookup_symbol(lf, symbol, deps, (caddr_t *)result));
1165
1166         case STB_WEAK:
1167                 kprintf("link_elf_obj_obj: Weak symbols not supported\n");
1168                 return (ENOENT);
1169
1170         default:
1171                 return (ENOENT);
1172         }
1173 }
1174
1175 static void
1176 link_elf_obj_fix_link_set(elf_file_t ef)
1177 {
1178         static const char startn[] = "__start_";
1179         static const char stopn[] = "__stop_";
1180         Elf_Sym *sym;
1181         const char *sym_name, *linkset_name;
1182         Elf_Addr startp, stopp;
1183         Elf_Size symidx;
1184         int start, i;
1185
1186         startp = stopp = 0;
1187         for (symidx = 1 /* zero entry is special */;
1188                 symidx < ef->ddbsymcnt; symidx++) {
1189                 sym = ef->ddbsymtab + symidx;
1190                 if (sym->st_shndx != SHN_UNDEF)
1191                         continue;
1192
1193                 sym_name = ef->ddbstrtab + sym->st_name;
1194                 if (strncmp(sym_name, startn, sizeof(startn) - 1) == 0) {
1195                         start = 1;
1196                         linkset_name = sym_name + sizeof(startn) - 1;
1197                 }
1198                 else if (strncmp(sym_name, stopn, sizeof(stopn) - 1) == 0) {
1199                         start = 0;
1200                         linkset_name = sym_name + sizeof(stopn) - 1;
1201                 }
1202                 else
1203                         continue;
1204
1205                 for (i = 0; i < ef->nprogtab; i++) {
1206                         if (strcmp(ef->progtab[i].name, linkset_name) == 0) {
1207                                 startp = (Elf_Addr)ef->progtab[i].addr;
1208                                 stopp = (Elf_Addr)(startp + ef->progtab[i].size);
1209                                 break;
1210                         }
1211                 }
1212                 if (i == ef->nprogtab)
1213                         continue;
1214
1215                 sym->st_value = start ? startp : stopp;
1216                 sym->st_shndx = i;
1217         }
1218 }
1219
1220 static void
1221 link_elf_obj_reloc_local(linker_file_t lf)
1222 {
1223         elf_file_t ef = lf->priv;
1224         const Elf_Rel *rellim;
1225         const Elf_Rel *rel;
1226         const Elf_Rela *relalim;
1227         const Elf_Rela *rela;
1228         const Elf_Sym *sym;
1229         Elf_Addr base;
1230         int i;
1231         Elf_Size symidx;
1232
1233         link_elf_obj_fix_link_set(ef);
1234
1235         /* Perform relocations without addend if there are any: */
1236         for (i = 0; i < ef->nreltab; i++) {
1237                 rel = ef->reltab[i].rel;
1238                 if (rel == NULL)
1239                         panic("lost a reltab!");
1240                 rellim = rel + ef->reltab[i].nrel;
1241                 base = findbase(ef, ef->reltab[i].sec);
1242                 if (base == 0)
1243                         panic("lost base for reltab");
1244                 for ( ; rel < rellim; rel++) {
1245                         symidx = ELF_R_SYM(rel->r_info);
1246                         if (symidx >= ef->ddbsymcnt)
1247                                 continue;
1248                         sym = ef->ddbsymtab + symidx;
1249                         /* Only do local relocs */
1250                         if (ELF_ST_BIND(sym->st_info) != STB_LOCAL)
1251                                 continue;
1252                         elf_reloc_local(lf, base, rel, ELF_RELOC_REL,
1253                             elf_obj_lookup);
1254                 }
1255         }
1256
1257         /* Perform relocations with addend if there are any: */
1258         for (i = 0; i < ef->nrelatab; i++) {
1259                 rela = ef->relatab[i].rela;
1260                 if (rela == NULL)
1261                         panic("lost a relatab!");
1262                 relalim = rela + ef->relatab[i].nrela;
1263                 base = findbase(ef, ef->relatab[i].sec);
1264                 if (base == 0)
1265                         panic("lost base for relatab");
1266                 for ( ; rela < relalim; rela++) {
1267                         symidx = ELF_R_SYM(rela->r_info);
1268                         if (symidx >= ef->ddbsymcnt)
1269                                 continue;
1270                         sym = ef->ddbsymtab + symidx;
1271                         /* Only do local relocs */
1272                         if (ELF_ST_BIND(sym->st_info) != STB_LOCAL)
1273                                 continue;
1274                         elf_reloc_local(lf, base, rela, ELF_RELOC_RELA,
1275                             elf_obj_lookup);
1276                 }
1277         }
1278 }