usr.sbin/kldxref/ef_obj.c

50 #include "ef.h"
102 static int ef_obj_get_type(elf_file_t ef);
103 static int ef_obj_close(elf_file_t ef);
104 static int ef_obj_read(elf_file_t ef, Elf_Off offset, size_t len, void* dest);
105 static int ef_obj_read_entry(elf_file_t ef, Elf_Off offset, size_t len,
107 static int ef_obj_seg_read(elf_file_t ef, Elf_Off offset, size_t len,
109 static int ef_obj_seg_read_rel(elf_file_t ef, Elf_Off offset, size_t len,
111 static int ef_obj_seg_read_entry(elf_file_t ef, Elf_Off offset, size_t len,
113 static int ef_obj_seg_read_entry_rel(elf_file_t ef, Elf_Off offset, size_t len,
115 static Elf_Addr ef_obj_symaddr(elf_file_t ef, Elf_Size symidx);
116 static int ef_obj_lookup_set(elf_file_t ef, const char *name, long *startp,
118 static int ef_obj_lookup_symbol(elf_file_t ef, const char* name, Elf_Sym** sym);
135 ef_obj_get_type(elf_file_t __unused ef)
142 ef_obj_lookup_symbol(elf_file_t ef, const char* name, Elf_Sym** sym)
148 	for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) {
149 		strp = ef->ddbstrtab + symp->st_name;
159 ef_obj_lookup_set(elf_file_t ef, const char *name, long *startp, long *stopp,
164 	for (i = 0; i < ef->nprogtab; i++) {
165 		if ((strncmp(ef->progtab[i].name, "set_", 4) == 0) &&
166 		    strcmp(ef->progtab[i].name + 4, name) == 0) {
167 			*startp = (char *)ef->progtab[i].addr - ef->address;
168 			*stopp = (char *)ef->progtab[i].addr +
169 			    ef->progtab[i].size - ef->address;
178 ef_obj_symaddr(elf_file_t ef, Elf_Size symidx)
182 	if (symidx >= (size_t) ef->ddbsymcnt)
184 	sym = ef->ddbsymtab + symidx;
187 		return (sym->st_value - (Elf_Addr)ef->address);
192 ef_obj_read(elf_file_t ef, Elf_Off offset, size_t len, void *dest)
197 		if (lseek(ef->ef_fd, offset, SEEK_SET) == -1)
201 	r = read(ef->ef_fd, dest, len);
209 ef_obj_read_entry(elf_file_t ef, Elf_Off offset, size_t len, void **ptr)
216 	error = ef_obj_read(ef, offset, len, *ptr);
223 ef_obj_seg_read(elf_file_t ef, Elf_Off offset, size_t len, void *dest)
226 	if (offset + len > ef->size) {
227 		if (ef->ef_verbose)
229 			    ef->ef_name, (long)offset, (long)len);
232 	bcopy(ef->address + offset, dest, len);
237 ef_obj_seg_read_rel(elf_file_t ef, Elf_Off offset, size_t len, void *dest)
245 	if (offset + len > ef->size) {
246 		if (ef->ef_verbose)
248 			    ef->ef_name, (long)offset, (long)len);
251 	bcopy(ef->address + offset, dest, len);
254 	memaddr = ef->address + offset;
257 	for (i = 0; i < ef->nprogtab; i++) {
258 		if (ef->progtab[i].addr == NULL)
260 		if (memaddr < (char *)ef->progtab[i].addr || memaddr + len >
261 		     (char *)ef->progtab[i].addr + ef->progtab[i].size)
263 		sec = ef->progtab[i].sec;
265 		secbase = (char *)ef->progtab[i].addr - ef->address;
266 		dataoff = memaddr - ef->address;
274 	for (i = 0; i < ef->nrel; i++) {
275 		if (ef->reltab[i].sec != sec)
277 		for (r = ef->reltab[i].rel;
278 		     r < &ef->reltab[i].rel[ef->reltab[i].nrel]; r++) {
279 			error = ef_reloc(ef->ef_efile, r, EF_RELOC_REL, secbase,
285 	for (i = 0; i < ef->nrela; i++) {
286 		if (ef->relatab[i].sec != sec)
288 		for (a = ef->relatab[i].rela;
289 		     a < &ef->relatab[i].rela[ef->relatab[i].nrela]; a++) {
290 			error = ef_reloc(ef->ef_efile, a, EF_RELOC_RELA,
300 ef_obj_seg_read_entry(elf_file_t ef, Elf_Off offset, size_t len, void **ptr)
307 	error = ef_obj_seg_read(ef, offset, len, *ptr);
314 ef_obj_seg_read_entry_rel(elf_file_t ef, Elf_Off offset, size_t len,
322 	error = ef_obj_seg_read_rel(ef, offset, len, *ptr);
331 	elf_file_t ef;
346 	ef = calloc(1, sizeof(*ef));
347 	if (ef == NULL) {
352 	efile->ef_ef = ef;
355 	ef->ef_verbose = verbose;
356 	ef->ef_fd = fd;
357 	ef->ef_name = strdup(filename);
358 	ef->ef_efile = efile;
359 	hdr = (Elf_Ehdr *)&ef->ef_hdr;
379 	if (ef_obj_read_entry(ef, hdr->e_shoff, nbytes, &vtmp) != 0) {
383 	ef->e_shdr = shdr = vtmp;
393 			ef->nprogtab++;
401 			ef->nrel++;
404 			ef->nrela++;
411 	if (ef->nprogtab == 0) {
426 	if (ef->nprogtab != 0)
427 		ef->progtab = calloc(ef->nprogtab, sizeof(*ef->progtab));
428 	if (ef->nrel != 0)
429 		ef->reltab = calloc(ef->nrel, sizeof(*ef->reltab));
430 	if (ef->nrela != 0)
431 		ef->relatab = calloc(ef->nrela, sizeof(*ef->relatab));
432 	if ((ef->nprogtab != 0 && ef->progtab == NULL) ||
433 	    (ef->nrel != 0 && ef->reltab == NULL) ||
434 	    (ef->nrela != 0 && ef->relatab == NULL)) {
440 	ef->ddbsymcnt = shdr[symtabindex].sh_size / sizeof(Elf_Sym);
441 	if (ef_obj_read_entry(ef, shdr[symtabindex].sh_offset,
442 	    shdr[symtabindex].sh_size, (void**)&ef->ddbsymtab) != 0) {
447 	ef->ddbstrcnt = shdr[symstrindex].sh_size;
448 	if (ef_obj_read_entry(ef, shdr[symstrindex].sh_offset,
449 	    shdr[symstrindex].sh_size, (void**)&ef->ddbstrtab) != 0) {
459 		ef->shstrcnt = shdr[shstrindex].sh_size;
460 		if (ef_obj_read_entry(ef, shdr[shstrindex].sh_offset,
461 		    shdr[shstrindex].sh_size, (void**)&ef->shstrtab) != 0) {
486 	ef->size = mapsize;
487 	if (posix_memalign((void **)&ef->address, max_addralign, mapsize)) {
491 	mapbase = ef->address;
508 			ef->progtab[pb].addr = (void *)(uintptr_t)mapbase;
510 				ef->progtab[pb].name = "<<PROGBITS>>";
511 				if (ef_obj_read(ef, shdr[i].sh_offset,
513 				    ef->progtab[pb].addr) != 0) {
518 				ef->progtab[pb].name = "<<NOBITS>>";
519 				bzero(ef->progtab[pb].addr, shdr[i].sh_size);
521 			ef->progtab[pb].size = shdr[i].sh_size;
522 			ef->progtab[pb].sec = i;
523 			if (ef->shstrtab && shdr[i].sh_name != 0)
524 				ef->progtab[pb].name =
525 				    ef->shstrtab + shdr[i].sh_name;
528 			for (j = 0; j < ef->ddbsymcnt; j++) {
529 				es = &ef->ddbsymtab[j];
532 				es->st_value += (Elf_Addr)ef->progtab[pb].addr;
538 			ef->reltab[rl].nrel = shdr[i].sh_size / sizeof(Elf_Rel);
539 			ef->reltab[rl].sec = shdr[i].sh_info;
540 			if (ef_obj_read_entry(ef, shdr[i].sh_offset,
541 			    shdr[i].sh_size, (void**)&ef->reltab[rl].rel) !=
549 			ef->relatab[ra].nrela =
551 			ef->relatab[ra].sec = shdr[i].sh_info;
552 			if (ef_obj_read_entry(ef, shdr[i].sh_offset,
553 			    shdr[i].sh_size, (void**)&ef->relatab[ra].rela) !=
565 		ef_obj_close(ef);
570 ef_obj_close(elf_file_t ef)
574 	close(ef->ef_fd);
575 	if (ef->ef_name)
576 		free(ef->ef_name);
577 	if (ef->e_shdr != NULL)
578 		free(ef->e_shdr);
579 	if (ef->size != 0)
580 		free(ef->address);
581 	if (ef->nprogtab != 0)
582 		free(ef->progtab);
583 	if (ef->nrel != 0) {
584 		for (i = 0; i < ef->nrel; i++)
585 			if (ef->reltab[i].rel != NULL)
586 				free(ef->reltab[i].rel);
587 		free(ef->reltab);
589 	if (ef->nrela != 0) {
590 		for (i = 0; i < ef->nrela; i++)
591 			if (ef->relatab[i].rela != NULL)
592 				free(ef->relatab[i].rela);
593 		free(ef->relatab);
595 	if (ef->ddbsymtab != NULL)
596 		free(ef->ddbsymtab);
597 	if (ef->ddbstrtab != NULL)
598 		free(ef->ddbstrtab);
599 	if (ef->shstrtab != NULL)
600 		free(ef->shstrtab);
601 	ef->ef_efile->ef_ops = NULL;
602 	ef->ef_efile->ef_ef = NULL;
603 	free(ef);