- Gigabyte G33-S2H fixup, due to the present of multiple competing
[dragonfly.git] / sys / kern / link_aout.c
blobcac5c19344145ec03bd00674c2abe3a2e22ffaf1
1 /*-
2 * Copyright (c) 1997 Doug Rabson
3 * All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
26 * $FreeBSD: src/sys/kern/link_aout.c,v 1.26 1999/12/24 15:33:36 bde Exp $
27 * $DragonFly: src/sys/kern/link_aout.c,v 1.22 2007/04/30 07:18:54 dillon Exp $
30 #define FREEBSD_AOUT 1
32 #include <sys/param.h>
33 #include <sys/kernel.h>
34 #include <sys/systm.h>
35 #include <sys/types.h>
36 #include <sys/malloc.h>
37 #include <sys/proc.h>
38 #include <sys/nlookup.h>
39 #include <sys/fcntl.h>
40 #include <sys/vnode.h>
41 #include <sys/linker.h>
43 #include <vm/vm_zone.h>
45 #ifndef __ELF__
46 #include <vm/vm.h>
47 #include <vm/pmap.h>
48 #include <machine/vmparam.h>
49 #endif
51 #include <machine/exec.h>
52 #include <sys/imgact_aout.h>
53 #include <machine/reloc.h>
54 #define _AOUT_INCLUDE_
55 #include <sys/nlist_aout.h>
56 #include <sys/link_aout.h>
58 static int link_aout_load_module(const char*, linker_file_t*);
60 static int link_aout_load_file(const char*, linker_file_t*);
62 static int link_aout_lookup_symbol(linker_file_t, const char*,
63 c_linker_sym_t*);
64 static int link_aout_symbol_values(linker_file_t file, c_linker_sym_t sym,
65 linker_symval_t* symval);
66 static int link_aout_search_symbol(linker_file_t lf, caddr_t value,
67 c_linker_sym_t* sym, long* diffp);
68 static void link_aout_unload_file(linker_file_t);
69 static void link_aout_unload_module(linker_file_t);
70 static int link_aout_lookup_set(linker_file_t lf, const char *name,
71 void ***startp, void ***stopp, int *countp);
73 static struct linker_class_ops link_aout_class_ops = {
74 link_aout_load_module,
77 static struct linker_file_ops link_aout_file_ops = {
78 link_aout_lookup_symbol,
79 link_aout_symbol_values,
80 link_aout_search_symbol,
81 link_aout_unload_file,
82 link_aout_lookup_set
84 static struct linker_file_ops link_aout_module_ops = {
85 link_aout_lookup_symbol,
86 link_aout_symbol_values,
87 link_aout_search_symbol,
88 link_aout_unload_module,
89 link_aout_lookup_set
92 typedef struct aout_file {
93 char* address; /* Load address */
94 struct _dynamic* dynamic; /* Symbol table etc. */
95 } *aout_file_t;
97 static int load_dependancies(linker_file_t lf);
98 static int relocate_file(linker_file_t lf);
101 * The kernel symbol table starts here.
103 extern struct _dynamic _DYNAMIC;
105 static void
106 link_aout_init(void* arg)
108 #ifndef __ELF__
109 struct _dynamic* dp = &_DYNAMIC;
110 #endif
112 linker_add_class("a.out", NULL, &link_aout_class_ops);
114 #ifndef __ELF__
115 if (dp) {
116 aout_file_t af;
118 af = kmalloc(sizeof(struct aout_file), M_LINKER, M_NOWAIT);
119 if (af == NULL)
120 panic("link_aout_init: Can't create linker structures for kernel");
121 bzero(af, sizeof(*af));
123 af->address = 0;
124 af->dynamic = dp;
125 linker_kernel_file =
126 linker_make_file(kernelname, af, &link_aout_file_ops);
127 if (linker_kernel_file == NULL)
128 panic("link_aout_init: Can't create linker structures for kernel");
129 linker_kernel_file->address = (caddr_t) KERNBASE;
130 linker_kernel_file->size = -(long)linker_kernel_file->address;
131 linker_current_file = linker_kernel_file;
132 linker_kernel_file->flags |= LINKER_FILE_LINKED;
134 #endif
137 SYSINIT(link_aout, SI_BOOT2_KLD, SI_ORDER_THIRD, link_aout_init, 0);
139 static int
140 link_aout_load_module(const char* filename, linker_file_t* result)
142 caddr_t modptr, baseptr;
143 char *type;
144 struct exec *ehdr;
145 aout_file_t af;
146 linker_file_t lf;
147 int error;
149 /* Look to see if we have the module preloaded. */
150 if ((modptr = preload_search_by_name(filename)) == NULL)
151 return(link_aout_load_file(filename, result));
153 /* It's preloaded, check we can handle it and collect information. */
154 if (((type = (char *)preload_search_info(modptr, MODINFO_TYPE)) == NULL) ||
155 strcmp(type, "a.out module") ||
156 ((baseptr = preload_search_info(modptr, MODINFO_ADDR)) == NULL) ||
157 ((ehdr = (struct exec *)preload_search_info(modptr, MODINFO_METADATA | MODINFOMD_AOUTEXEC)) == NULL))
158 return(0); /* we can't handle this */
160 /* Looks like we can handle this one */
161 af = kmalloc(sizeof(struct aout_file), M_LINKER, M_WAITOK);
162 bzero(af, sizeof(*af));
163 af->address = baseptr;
165 /* Assume _DYNAMIC is the first data item. */
166 af->dynamic = (struct _dynamic*)(af->address + ehdr->a_text);
167 if (af->dynamic->d_version != LD_VERSION_BSD) {
168 kfree(af, M_LINKER);
169 return(0); /* we can't handle this */
171 af->dynamic->d_un.d_sdt = (struct section_dispatch_table *)
172 ((char *)af->dynamic->d_un.d_sdt + (vm_offset_t)af->address);
174 /* Register with kld */
175 lf = linker_make_file(filename, af, &link_aout_module_ops);
176 if (lf == NULL) {
177 kfree(af, M_LINKER);
178 return(ENOMEM);
180 lf->address = af->address;
181 lf->size = ehdr->a_text + ehdr->a_data + ehdr->a_bss;
183 /* Try to load dependancies */
184 if (((error = load_dependancies(lf)) != 0) ||
185 ((error = relocate_file(lf)) != 0)) {
186 linker_file_unload(lf);
187 return(error);
189 lf->flags |= LINKER_FILE_LINKED;
190 *result = lf;
191 return(0);
194 static int
195 link_aout_load_file(const char* filename, linker_file_t* result)
197 struct nlookupdata nd;
198 struct thread *td = curthread;
199 struct proc *p = td->td_proc;
200 struct vnode *vp;
201 int error = 0;
202 int resid;
203 struct exec header;
204 aout_file_t af;
205 linker_file_t lf;
206 char *pathname;
208 KKASSERT(p != NULL);
210 if (p->p_ucred == NULL) {
211 kprintf("link_aout_load_file: cannot load '%s' from filesystem"
212 " this early\n", filename);
213 return ENOENT;
216 pathname = linker_search_path(filename);
217 if (pathname == NULL)
218 return ENOENT;
219 error = nlookup_init(&nd, pathname, UIO_SYSSPACE, NLC_FOLLOW|NLC_LOCKVP);
220 if (error == 0)
221 error = vn_open(&nd, NULL, FREAD, 0);
222 kfree(pathname, M_LINKER);
223 if (error) {
224 nlookup_done(&nd);
225 return error;
227 vp = nd.nl_open_vp;
228 nd.nl_open_vp = NULL;
229 nlookup_done(&nd);
232 * Read the a.out header from the file.
234 error = vn_rdwr(UIO_READ, vp, (void*) &header, sizeof header, 0,
235 UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
236 if (error)
237 goto out;
239 if (N_BADMAG(header) || !(N_GETFLAG(header) & EX_DYNAMIC))
240 goto out;
243 * We have an a.out file, so make some space to read it in.
245 af = kmalloc(sizeof(struct aout_file), M_LINKER, M_WAITOK);
246 bzero(af, sizeof(*af));
247 af->address = kmalloc(header.a_text + header.a_data + header.a_bss,
248 M_LINKER, M_WAITOK);
251 * Read the text and data sections and zero the bss.
253 error = vn_rdwr(UIO_READ, vp, (void*) af->address,
254 header.a_text + header.a_data, 0,
255 UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
256 if (error)
257 goto out;
258 bzero(af->address + header.a_text + header.a_data, header.a_bss);
261 * Assume _DYNAMIC is the first data item.
263 af->dynamic = (struct _dynamic*) (af->address + header.a_text);
264 if (af->dynamic->d_version != LD_VERSION_BSD) {
265 kfree(af->address, M_LINKER);
266 kfree(af, M_LINKER);
267 goto out;
269 af->dynamic->d_un.d_sdt = (struct section_dispatch_table *)
270 ((char *)af->dynamic->d_un.d_sdt + (vm_offset_t)af->address);
272 lf = linker_make_file(filename, af, &link_aout_file_ops);
273 if (lf == NULL) {
274 kfree(af->address, M_LINKER);
275 kfree(af, M_LINKER);
276 error = ENOMEM;
277 goto out;
279 lf->address = af->address;
280 lf->size = header.a_text + header.a_data + header.a_bss;
282 if ((error = load_dependancies(lf)) != 0
283 || (error = relocate_file(lf)) != 0) {
284 linker_file_unload(lf);
285 goto out;
288 lf->flags |= LINKER_FILE_LINKED;
289 *result = lf;
291 out:
292 vn_unlock(vp);
293 vn_close(vp, FREAD);
295 return error;
298 static void
299 link_aout_unload_file(linker_file_t file)
301 aout_file_t af = file->priv;
303 if (af) {
304 if (af->address)
305 kfree(af->address, M_LINKER);
306 kfree(af, M_LINKER);
310 static void
311 link_aout_unload_module(linker_file_t file)
313 aout_file_t af = file->priv;
315 if (af)
316 kfree(af, M_LINKER);
317 if (file->filename)
318 preload_delete_name(file->filename);
321 #define AOUT_RELOC(af, type, off) (type*) ((af)->address + (off))
323 static int
324 load_dependancies(linker_file_t lf)
326 aout_file_t af = lf->priv;
327 linker_file_t lfdep;
328 long off;
329 struct sod* sodp;
330 char* name;
331 char* filename = 0;
332 int error = 0;
335 * All files are dependant on /kernel.
337 if (linker_kernel_file) {
338 linker_kernel_file->refs++;
339 linker_file_add_dependancy(lf, linker_kernel_file);
342 off = LD_NEED(af->dynamic);
345 * Load the dependancies.
347 while (off != 0) {
348 sodp = AOUT_RELOC(af, struct sod, off);
349 name = AOUT_RELOC(af, char, sodp->sod_name);
351 error = linker_load_file(name, &lfdep);
352 if (error)
353 goto out;
354 error = linker_file_add_dependancy(lf, lfdep);
355 if (error)
356 goto out;
357 off = sodp->sod_next;
360 out:
361 if (filename)
362 kfree(filename, M_TEMP);
363 return error;
367 * XXX i386 dependant.
369 static long
370 read_relocation(struct relocation_info* r, char* addr)
372 int length = r->r_length;
373 if (length == 0)
374 return *(u_char*) addr;
375 else if (length == 1)
376 return *(u_short*) addr;
377 else if (length == 2)
378 return *(u_int*) addr;
379 else
380 kprintf("link_aout: unsupported relocation size %d\n", r->r_length);
381 return 0;
384 static void
385 write_relocation(struct relocation_info* r, char* addr, long value)
387 int length = r->r_length;
388 if (length == 0)
389 *(u_char*) addr = value;
390 else if (length == 1)
391 *(u_short*) addr = value;
392 else if (length == 2)
393 *(u_int*) addr = value;
394 else
395 kprintf("link_aout: unsupported relocation size %d\n", r->r_length);
398 static int
399 relocate_file(linker_file_t lf)
401 aout_file_t af = lf->priv;
402 struct relocation_info* rel;
403 struct relocation_info* erel;
404 struct relocation_info* r;
405 struct nzlist* symbolbase;
406 char* stringbase;
407 struct nzlist* np;
408 char* sym;
409 long relocation;
411 rel = AOUT_RELOC(af, struct relocation_info, LD_REL(af->dynamic));
412 erel = AOUT_RELOC(af, struct relocation_info,
413 LD_REL(af->dynamic) + LD_RELSZ(af->dynamic));
414 symbolbase = AOUT_RELOC(af, struct nzlist, LD_SYMBOL(af->dynamic));
415 stringbase = AOUT_RELOC(af, char, LD_STRINGS(af->dynamic));
417 for (r = rel; r < erel; r++) {
418 char* addr;
420 if (r->r_address == 0)
421 break;
423 addr = AOUT_RELOC(af, char, r->r_address);
424 if (r->r_extern) {
425 np = &symbolbase[r->r_symbolnum];
426 sym = &stringbase[np->nz_strx];
428 if (sym[0] != '_') {
429 kprintf("link_aout: bad symbol name %s\n", sym);
430 kprintf("link_aout: symbol %s not found\n", sym);
431 return ENOENT;
432 } else {
433 if (linker_file_lookup_symbol(lf, sym + 1,
434 (np->nz_type != (N_SETV+N_EXT)), (caddr_t *)&relocation)) {
435 kprintf("link_aout: symbol %s not found\n", sym);
436 return ENOENT;
440 relocation += read_relocation(r, addr);
442 if (r->r_jmptable) {
443 kprintf("link_aout: can't cope with jump table relocations\n");
444 continue;
447 if (r->r_pcrel)
448 relocation -= (intptr_t) af->address;
450 if (r->r_copy) {
451 kprintf("link_aout: can't cope with copy relocations\n");
452 continue;
455 write_relocation(r, addr, relocation);
456 } else {
457 write_relocation(r, addr,
458 (intptr_t)(read_relocation(r, addr) + af->address));
463 return 0;
466 static long
467 symbol_hash_value(aout_file_t af, const char* name)
469 long hashval;
470 const char* p;
472 hashval = '_'; /* fake a starting '_' for C symbols */
473 for (p = name; *p; p++)
474 hashval = (hashval << 1) + *p;
476 return (hashval & 0x7fffffff) % LD_BUCKETS(af->dynamic);
480 link_aout_lookup_symbol(linker_file_t file, const char* name,
481 c_linker_sym_t* sym)
483 aout_file_t af = file->priv;
484 long hashval;
485 struct rrs_hash* hashbase;
486 struct nzlist* symbolbase;
487 char* stringbase;
488 struct rrs_hash* hp;
489 struct nzlist* np;
490 char* cp;
492 if (LD_BUCKETS(af->dynamic) == 0)
493 return 0;
495 hashbase = AOUT_RELOC(af, struct rrs_hash, LD_HASH(af->dynamic));
496 symbolbase = AOUT_RELOC(af, struct nzlist, LD_SYMBOL(af->dynamic));
497 stringbase = AOUT_RELOC(af, char, LD_STRINGS(af->dynamic));
499 restart:
500 hashval = symbol_hash_value(af, name);
501 hp = &hashbase[hashval];
502 if (hp->rh_symbolnum == -1)
503 return ENOENT;
505 while (hp) {
506 np = (struct nzlist *) &symbolbase[hp->rh_symbolnum];
507 cp = stringbase + np->nz_strx;
509 * Note: we fake the leading '_' for C symbols.
511 if (cp[0] == '_' && !strcmp(cp + 1, name))
512 break;
514 if (hp->rh_next == 0)
515 hp = NULL;
516 else
517 hp = &hashbase[hp->rh_next];
520 if (hp == NULL)
522 * Not found.
524 return ENOENT;
527 * Check for an aliased symbol, whatever that is.
529 if (np->nz_type == N_INDR+N_EXT) {
530 name = stringbase + (++np)->nz_strx + 1; /* +1 for '_' */
531 goto restart;
535 * Check this is an actual definition of the symbol.
537 if (np->nz_value == 0)
538 return ENOENT;
540 if (np->nz_type == N_UNDF+N_EXT && np->nz_value != 0) {
541 if (np->nz_other == AUX_FUNC)
542 /* weak function */
543 return ENOENT;
546 *sym = (linker_sym_t) np;
548 return 0;
552 static int
553 link_aout_symbol_values(linker_file_t file, c_linker_sym_t sym,
554 linker_symval_t* symval)
556 aout_file_t af = file->priv;
557 const struct nzlist* np = (const struct nzlist*) sym;
558 char* stringbase;
559 long numsym = LD_STABSZ(af->dynamic) / sizeof(struct nzlist);
560 struct nzlist *symbase;
562 /* Is it one of ours? It could be another module... */
563 symbase = AOUT_RELOC(af, struct nzlist, LD_SYMBOL(af->dynamic));
564 if (np < symbase)
565 return ENOENT;
566 if ((np - symbase) > numsym)
567 return ENOENT;
569 stringbase = AOUT_RELOC(af, char, LD_STRINGS(af->dynamic));
571 symval->name = stringbase + np->nz_strx + 1; /* +1 for '_' */
572 if (np->nz_type == N_UNDF+N_EXT && np->nz_value != 0) {
573 symval->value = 0;
574 symval->size = np->nz_value;
575 } else {
576 symval->value = AOUT_RELOC(af, char, np->nz_value);
577 symval->size = np->nz_size;
579 return 0;
582 static int
583 link_aout_search_symbol(linker_file_t lf, caddr_t value,
584 c_linker_sym_t* sym, long* diffp)
586 aout_file_t af = lf->priv;
587 u_long off = (uintptr_t) (void *) value;
588 u_long diff = off;
589 u_long sp_nz_value;
590 struct nzlist* sp;
591 struct nzlist* ep;
592 struct nzlist* best = 0;
594 for (sp = AOUT_RELOC(af, struct nzlist, LD_SYMBOL(af->dynamic)),
595 ep = (struct nzlist *) ((caddr_t) sp + LD_STABSZ(af->dynamic));
596 sp < ep; sp++) {
597 if (sp->nz_name == 0)
598 continue;
599 sp_nz_value = sp->nz_value + (uintptr_t) (void *) af->address;
600 if (off >= sp_nz_value) {
601 if (off - sp_nz_value < diff) {
602 diff = off - sp_nz_value;
603 best = sp;
604 if (diff == 0)
605 break;
606 } else if (off - sp_nz_value == diff) {
607 best = sp;
611 if (best == 0)
612 *diffp = off;
613 else
614 *diffp = diff;
615 *sym = (linker_sym_t) best;
617 return 0;
621 * Look up a linker set on an a.out + gnu LD system.
624 struct generic_linker_set {
625 int ls_length;
626 void *ls_items[1];
629 static int
630 link_aout_lookup_set(linker_file_t lf, const char *name,
631 void ***startp, void ***stopp, int *countp)
633 c_linker_sym_t sym;
634 linker_symval_t symval;
635 void **start, **stop;
636 int error, count;
637 struct generic_linker_set *setp;
639 error = link_aout_lookup_symbol(lf, name, &sym);
640 if (error)
641 return error;
642 link_aout_symbol_values(lf, sym, &symval);
643 if (symval.value == 0)
644 return ESRCH;
645 setp = (struct generic_linker_set *)symval.value;
646 count = setp->ls_length;
647 start = &setp->ls_items[0];
648 stop = &setp->ls_items[count];
649 if (startp)
650 *startp = start;
651 if (stopp)
652 *stopp = stop;
653 if (countp)
654 *countp = count;
655 return 0;