1171 lines
29 KiB
C
1171 lines
29 KiB
C
/*-
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* Copyright (c) 1998-2000 Doug Rabson
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* Copyright (c) 2004 Peter Wemm
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_ddb.h"
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#include "opt_mac.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/mac.h>
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#include <sys/malloc.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/namei.h>
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#include <sys/fcntl.h>
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#include <sys/vnode.h>
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#include <sys/linker.h>
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#include <machine/elf.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <vm/vm_object.h>
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#include <vm/vm_kern.h>
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#include <vm/vm_extern.h>
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#include <vm/pmap.h>
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#include <vm/vm_map.h>
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#include <sys/link_elf.h>
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#include "linker_if.h"
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typedef struct {
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void *addr;
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Elf_Off size;
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int flags;
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int sec; /* Original section */
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char *name;
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} Elf_progent;
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typedef struct {
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Elf_Rel *rel;
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int nrel;
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int sec;
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} Elf_relent;
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typedef struct {
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Elf_Rela *rela;
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int nrela;
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int sec;
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} Elf_relaent;
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typedef struct elf_file {
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struct linker_file lf; /* Common fields */
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int preloaded;
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caddr_t address; /* Relocation address */
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vm_object_t object; /* VM object to hold file pages */
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Elf_Shdr *e_shdr;
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Elf_progent *progtab;
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int nprogtab;
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Elf_relaent *relatab;
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int nrela;
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Elf_relent *reltab;
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int nrel;
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Elf_Sym *ddbsymtab; /* The symbol table we are using */
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long ddbsymcnt; /* Number of symbols */
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caddr_t ddbstrtab; /* String table */
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long ddbstrcnt; /* number of bytes in string table */
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caddr_t shstrtab; /* Section name string table */
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long shstrcnt; /* number of bytes in string table */
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} *elf_file_t;
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static int link_elf_link_preload(linker_class_t cls,
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const char *, linker_file_t *);
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static int link_elf_link_preload_finish(linker_file_t);
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static int link_elf_load_file(linker_class_t, const char *, linker_file_t *);
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static int link_elf_lookup_symbol(linker_file_t, const char *,
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c_linker_sym_t *);
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static int link_elf_symbol_values(linker_file_t, c_linker_sym_t,
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linker_symval_t *);
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static int link_elf_search_symbol(linker_file_t, caddr_t value,
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c_linker_sym_t *sym, long *diffp);
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static void link_elf_unload_file(linker_file_t);
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static int link_elf_lookup_set(linker_file_t, const char *,
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void ***, void ***, int *);
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static int link_elf_each_function_name(linker_file_t,
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int (*)(const char *, void *), void *);
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static void link_elf_reloc_local(linker_file_t);
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static Elf_Addr elf_obj_lookup(linker_file_t lf, Elf_Word symidx, int deps);
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static kobj_method_t link_elf_methods[] = {
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KOBJMETHOD(linker_lookup_symbol, link_elf_lookup_symbol),
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KOBJMETHOD(linker_symbol_values, link_elf_symbol_values),
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KOBJMETHOD(linker_search_symbol, link_elf_search_symbol),
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KOBJMETHOD(linker_unload, link_elf_unload_file),
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KOBJMETHOD(linker_load_file, link_elf_load_file),
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KOBJMETHOD(linker_link_preload, link_elf_link_preload),
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KOBJMETHOD(linker_link_preload_finish, link_elf_link_preload_finish),
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KOBJMETHOD(linker_lookup_set, link_elf_lookup_set),
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KOBJMETHOD(linker_each_function_name, link_elf_each_function_name),
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{ 0, 0 }
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};
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static struct linker_class link_elf_class = {
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#if ELF_TARG_CLASS == ELFCLASS32
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"elf32_obj",
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#else
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"elf64_obj",
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#endif
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link_elf_methods, sizeof(struct elf_file)
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};
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static int relocate_file(elf_file_t ef);
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static void
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link_elf_error(const char *s)
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{
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printf("kldload: %s\n", s);
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}
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static void
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link_elf_init(void *arg)
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{
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linker_add_class(&link_elf_class);
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}
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SYSINIT(link_elf_obj, SI_SUB_KLD, SI_ORDER_SECOND, link_elf_init, 0);
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static int
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link_elf_link_preload(linker_class_t cls, const char *filename,
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linker_file_t *result)
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{
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Elf_Ehdr *hdr;
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Elf_Shdr *shdr;
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Elf_Sym *es;
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void *modptr, *baseptr, *sizeptr;
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char *type;
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elf_file_t ef;
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linker_file_t lf;
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Elf_Addr off;
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int error, i, j, pb, ra, rl, shstrindex, symstrindex, symtabindex;
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/* Look to see if we have the file preloaded */
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modptr = preload_search_by_name(filename);
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if (modptr == NULL)
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return ENOENT;
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type = (char *)preload_search_info(modptr, MODINFO_TYPE);
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baseptr = preload_search_info(modptr, MODINFO_ADDR);
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sizeptr = preload_search_info(modptr, MODINFO_SIZE);
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hdr = (Elf_Ehdr *)preload_search_info(modptr, MODINFO_METADATA |
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MODINFOMD_ELFHDR);
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shdr = (Elf_Shdr *)preload_search_info(modptr, MODINFO_METADATA |
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MODINFOMD_SHDR);
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if (type == NULL || (strcmp(type, "elf" __XSTRING(__ELF_WORD_SIZE)
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" obj module") != 0 &&
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strcmp(type, "elf obj module") != 0)) {
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return (EFTYPE);
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}
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if (baseptr == NULL || sizeptr == NULL || hdr == NULL ||
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shdr == NULL)
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return (EINVAL);
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lf = linker_make_file(filename, &link_elf_class);
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if (lf == NULL)
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return (ENOMEM);
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ef = (elf_file_t)lf;
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ef->preloaded = 1;
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ef->address = *(caddr_t *)baseptr;
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lf->address = *(caddr_t *)baseptr;
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lf->size = *(size_t *)sizeptr;
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if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS ||
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hdr->e_ident[EI_DATA] != ELF_TARG_DATA ||
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hdr->e_ident[EI_VERSION] != EV_CURRENT ||
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hdr->e_version != EV_CURRENT ||
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hdr->e_type != ET_REL ||
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hdr->e_machine != ELF_TARG_MACH) {
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error = EFTYPE;
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goto out;
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}
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ef->e_shdr = shdr;
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/* Scan the section header for information and table sizing. */
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symtabindex = -1;
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symstrindex = -1;
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for (i = 0; i < hdr->e_shnum; i++) {
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switch (shdr[i].sh_type) {
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case SHT_PROGBITS:
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case SHT_NOBITS:
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ef->nprogtab++;
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break;
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case SHT_SYMTAB:
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symtabindex = i;
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symstrindex = shdr[i].sh_link;
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break;
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case SHT_REL:
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ef->nrel++;
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break;
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case SHT_RELA:
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ef->nrela++;
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break;
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}
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}
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shstrindex = hdr->e_shstrndx;
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if (ef->nprogtab == 0 || symstrindex < 0 ||
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symstrindex >= hdr->e_shnum ||
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shdr[symstrindex].sh_type != SHT_STRTAB || shstrindex == 0 ||
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shstrindex >= hdr->e_shnum ||
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shdr[shstrindex].sh_type != SHT_STRTAB) {
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printf("%s: bad/missing section headers\n", filename);
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error = ENOEXEC;
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goto out;
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}
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/* Allocate space for tracking the load chunks */
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if (ef->nprogtab != 0)
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ef->progtab = malloc(ef->nprogtab * sizeof(*ef->progtab),
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M_LINKER, M_WAITOK | M_ZERO);
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if (ef->nrel != 0)
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ef->reltab = malloc(ef->nrel * sizeof(*ef->reltab), M_LINKER,
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M_WAITOK | M_ZERO);
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if (ef->nrela != 0)
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ef->relatab = malloc(ef->nrela * sizeof(*ef->relatab), M_LINKER,
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M_WAITOK | M_ZERO);
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if ((ef->nprogtab != 0 && ef->progtab == NULL) ||
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(ef->nrel != 0 && ef->reltab == NULL) ||
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(ef->nrela != 0 && ef->relatab == NULL)) {
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error = ENOMEM;
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goto out;
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}
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/* XXX, relocate the sh_addr fields saved by the loader. */
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off = 0;
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for (i = 0; i < hdr->e_shnum; i++) {
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if (shdr[i].sh_addr != 0 && (off == 0 || shdr[i].sh_addr < off))
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off = shdr[i].sh_addr;
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}
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for (i = 0; i < hdr->e_shnum; i++) {
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if (shdr[i].sh_addr != 0)
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shdr[i].sh_addr = shdr[i].sh_addr - off +
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(Elf_Addr)ef->address;
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}
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ef->ddbsymcnt = shdr[symtabindex].sh_size / sizeof(Elf_Sym);
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ef->ddbsymtab = (Elf_Sym *)shdr[symtabindex].sh_addr;
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ef->ddbstrcnt = shdr[symstrindex].sh_size;
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ef->ddbstrtab = (char *)shdr[symstrindex].sh_addr;
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ef->shstrcnt = shdr[shstrindex].sh_size;
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ef->shstrtab = (char *)shdr[shstrindex].sh_addr;
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/* Now fill out progtab and the relocation tables. */
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pb = 0;
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rl = 0;
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ra = 0;
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for (i = 0; i < hdr->e_shnum; i++) {
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switch (shdr[i].sh_type) {
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case SHT_PROGBITS:
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case SHT_NOBITS:
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ef->progtab[pb].addr = (void *)shdr[i].sh_addr;
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if (shdr[i].sh_type == SHT_PROGBITS)
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ef->progtab[pb].name = "<<PROGBITS>>";
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else
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ef->progtab[pb].name = "<<NOBITS>>";
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ef->progtab[pb].size = shdr[i].sh_size;
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ef->progtab[pb].sec = i;
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if (ef->shstrtab && shdr[i].sh_name != 0)
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ef->progtab[pb].name =
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ef->shstrtab + shdr[i].sh_name;
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/* Update all symbol values with the offset. */
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for (j = 0; j < ef->ddbsymcnt; j++) {
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es = &ef->ddbsymtab[j];
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if (es->st_shndx != i)
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continue;
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es->st_value += (Elf_Addr)ef->progtab[pb].addr;
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}
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pb++;
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break;
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case SHT_REL:
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ef->reltab[rl].rel = (Elf_Rel *)shdr[i].sh_addr;
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ef->reltab[rl].nrel = shdr[i].sh_size / sizeof(Elf_Rel);
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ef->reltab[rl].sec = shdr[i].sh_info;
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rl++;
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break;
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case SHT_RELA:
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ef->relatab[ra].rela = (Elf_Rela *)shdr[i].sh_addr;
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ef->relatab[ra].nrela =
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shdr[i].sh_size / sizeof(Elf_Rela);
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ef->relatab[ra].sec = shdr[i].sh_info;
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ra++;
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break;
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}
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}
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if (pb != ef->nprogtab)
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panic("lost progbits");
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if (rl != ef->nrel)
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panic("lost rel");
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if (ra != ef->nrela)
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panic("lost rela");
|
|
|
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/* Local intra-module relocations */
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link_elf_reloc_local(lf);
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|
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*result = lf;
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return (0);
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|
|
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out:
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/* preload not done this way */
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linker_file_unload(lf, LINKER_UNLOAD_FORCE);
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return (error);
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}
|
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|
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static int
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link_elf_link_preload_finish(linker_file_t lf)
|
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{
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elf_file_t ef;
|
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int error;
|
|
|
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ef = (elf_file_t)lf;
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error = relocate_file(ef);
|
|
if (error)
|
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return error;
|
|
|
|
/* Notify MD code that a module is being loaded. */
|
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error = elf_cpu_load_file(lf);
|
|
if (error)
|
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return (error);
|
|
|
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return (0);
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}
|
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|
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static int
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link_elf_load_file(linker_class_t cls, const char *filename,
|
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linker_file_t *result)
|
|
{
|
|
struct nameidata nd;
|
|
struct thread *td = curthread; /* XXX */
|
|
Elf_Ehdr *hdr;
|
|
Elf_Shdr *shdr;
|
|
Elf_Sym *es;
|
|
int nbytes, i, j;
|
|
vm_offset_t mapbase;
|
|
size_t mapsize;
|
|
int error = 0;
|
|
int resid, flags;
|
|
elf_file_t ef;
|
|
linker_file_t lf;
|
|
int symtabindex;
|
|
int symstrindex;
|
|
int shstrindex;
|
|
int nsym;
|
|
int pb, rl, ra;
|
|
int alignmask;
|
|
|
|
GIANT_REQUIRED;
|
|
|
|
shdr = NULL;
|
|
lf = NULL;
|
|
mapsize = 0;
|
|
hdr = NULL;
|
|
|
|
NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, filename, td);
|
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flags = FREAD;
|
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error = vn_open(&nd, &flags, 0, -1);
|
|
if (error)
|
|
return error;
|
|
NDFREE(&nd, NDF_ONLY_PNBUF);
|
|
#ifdef MAC
|
|
error = mac_check_kld_load(td->td_ucred, nd.ni_vp);
|
|
if (error) {
|
|
goto out;
|
|
}
|
|
#endif
|
|
|
|
/* Read the elf header from the file. */
|
|
hdr = malloc(sizeof(*hdr), M_LINKER, M_WAITOK);
|
|
if (hdr == NULL) {
|
|
error = ENOMEM;
|
|
goto out;
|
|
}
|
|
error = vn_rdwr(UIO_READ, nd.ni_vp, (void *)hdr, sizeof(*hdr), 0,
|
|
UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
|
|
&resid, td);
|
|
if (error)
|
|
goto out;
|
|
if (resid != 0){
|
|
error = ENOEXEC;
|
|
goto out;
|
|
}
|
|
|
|
if (!IS_ELF(*hdr)) {
|
|
error = ENOEXEC;
|
|
goto out;
|
|
}
|
|
|
|
if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS
|
|
|| hdr->e_ident[EI_DATA] != ELF_TARG_DATA) {
|
|
link_elf_error("Unsupported file layout");
|
|
error = ENOEXEC;
|
|
goto out;
|
|
}
|
|
if (hdr->e_ident[EI_VERSION] != EV_CURRENT
|
|
|| hdr->e_version != EV_CURRENT) {
|
|
link_elf_error("Unsupported file version");
|
|
error = ENOEXEC;
|
|
goto out;
|
|
}
|
|
if (hdr->e_type != ET_REL) {
|
|
link_elf_error("Unsupported file type");
|
|
error = ENOEXEC;
|
|
goto out;
|
|
}
|
|
if (hdr->e_machine != ELF_TARG_MACH) {
|
|
link_elf_error("Unsupported machine");
|
|
error = ENOEXEC;
|
|
goto out;
|
|
}
|
|
|
|
lf = linker_make_file(filename, &link_elf_class);
|
|
if (!lf) {
|
|
error = ENOMEM;
|
|
goto out;
|
|
}
|
|
ef = (elf_file_t) lf;
|
|
ef->nprogtab = 0;
|
|
ef->e_shdr = 0;
|
|
ef->nrel = 0;
|
|
ef->nrela = 0;
|
|
|
|
/* Allocate and read in the section header */
|
|
nbytes = hdr->e_shnum * hdr->e_shentsize;
|
|
if (nbytes == 0 || hdr->e_shoff == 0 ||
|
|
hdr->e_shentsize != sizeof(Elf_Shdr)) {
|
|
error = ENOEXEC;
|
|
goto out;
|
|
}
|
|
shdr = malloc(nbytes, M_LINKER, M_WAITOK);
|
|
if (shdr == NULL) {
|
|
error = ENOMEM;
|
|
goto out;
|
|
}
|
|
ef->e_shdr = shdr;
|
|
error = vn_rdwr(UIO_READ, nd.ni_vp, (caddr_t)shdr, nbytes, hdr->e_shoff,
|
|
UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, &resid, td);
|
|
if (error)
|
|
goto out;
|
|
if (resid) {
|
|
error = ENOEXEC;
|
|
goto out;
|
|
}
|
|
|
|
/* Scan the section header for information and table sizing. */
|
|
nsym = 0;
|
|
symtabindex = -1;
|
|
symstrindex = -1;
|
|
for (i = 0; i < hdr->e_shnum; i++) {
|
|
switch (shdr[i].sh_type) {
|
|
case SHT_PROGBITS:
|
|
case SHT_NOBITS:
|
|
ef->nprogtab++;
|
|
break;
|
|
case SHT_SYMTAB:
|
|
nsym++;
|
|
symtabindex = i;
|
|
symstrindex = shdr[i].sh_link;
|
|
break;
|
|
case SHT_REL:
|
|
ef->nrel++;
|
|
break;
|
|
case SHT_RELA:
|
|
ef->nrela++;
|
|
break;
|
|
case SHT_STRTAB:
|
|
break;
|
|
}
|
|
}
|
|
if (ef->nprogtab == 0) {
|
|
link_elf_error("file has no contents");
|
|
error = ENOEXEC;
|
|
goto out;
|
|
}
|
|
if (nsym != 1) {
|
|
/* Only allow one symbol table for now */
|
|
link_elf_error("file has no valid symbol table");
|
|
error = ENOEXEC;
|
|
goto out;
|
|
}
|
|
if (symstrindex < 0 || symstrindex > hdr->e_shnum ||
|
|
shdr[symstrindex].sh_type != SHT_STRTAB) {
|
|
link_elf_error("file has invalid symbol strings");
|
|
error = ENOEXEC;
|
|
goto out;
|
|
}
|
|
|
|
/* Allocate space for tracking the load chunks */
|
|
if (ef->nprogtab != 0)
|
|
ef->progtab = malloc(ef->nprogtab * sizeof(*ef->progtab),
|
|
M_LINKER, M_WAITOK | M_ZERO);
|
|
if (ef->nrel != 0)
|
|
ef->reltab = malloc(ef->nrel * sizeof(*ef->reltab), M_LINKER,
|
|
M_WAITOK | M_ZERO);
|
|
if (ef->nrela != 0)
|
|
ef->relatab = malloc(ef->nrela * sizeof(*ef->relatab), M_LINKER,
|
|
M_WAITOK | M_ZERO);
|
|
if ((ef->nprogtab != 0 && ef->progtab == NULL) ||
|
|
(ef->nrel != 0 && ef->reltab == NULL) ||
|
|
(ef->nrela != 0 && ef->relatab == NULL)) {
|
|
error = ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
if (symtabindex == -1)
|
|
panic("lost symbol table index");
|
|
/* Allocate space for and load the symbol table */
|
|
ef->ddbsymcnt = shdr[symtabindex].sh_size / sizeof(Elf_Sym);
|
|
ef->ddbsymtab = malloc(shdr[symtabindex].sh_size, M_LINKER, M_WAITOK);
|
|
if (ef->ddbsymtab == NULL) {
|
|
error = ENOMEM;
|
|
goto out;
|
|
}
|
|
error = vn_rdwr(UIO_READ, nd.ni_vp, (void *)ef->ddbsymtab,
|
|
shdr[symtabindex].sh_size, shdr[symtabindex].sh_offset,
|
|
UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
|
|
&resid, td);
|
|
if (error)
|
|
goto out;
|
|
if (resid != 0){
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
if (symstrindex == -1)
|
|
panic("lost symbol string index");
|
|
/* Allocate space for and load the symbol strings */
|
|
ef->ddbstrcnt = shdr[symstrindex].sh_size;
|
|
ef->ddbstrtab = malloc(shdr[symstrindex].sh_size, M_LINKER, M_WAITOK);
|
|
if (ef->ddbstrtab == NULL) {
|
|
error = ENOMEM;
|
|
goto out;
|
|
}
|
|
error = vn_rdwr(UIO_READ, nd.ni_vp, ef->ddbstrtab,
|
|
shdr[symstrindex].sh_size, shdr[symstrindex].sh_offset,
|
|
UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
|
|
&resid, td);
|
|
if (error)
|
|
goto out;
|
|
if (resid != 0){
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
/* Do we have a string table for the section names? */
|
|
shstrindex = -1;
|
|
if (hdr->e_shstrndx != 0 &&
|
|
shdr[hdr->e_shstrndx].sh_type == SHT_STRTAB) {
|
|
shstrindex = hdr->e_shstrndx;
|
|
ef->shstrcnt = shdr[shstrindex].sh_size;
|
|
ef->shstrtab = malloc(shdr[shstrindex].sh_size, M_LINKER,
|
|
M_WAITOK);
|
|
if (ef->shstrtab == NULL) {
|
|
error = ENOMEM;
|
|
goto out;
|
|
}
|
|
error = vn_rdwr(UIO_READ, nd.ni_vp, ef->shstrtab,
|
|
shdr[shstrindex].sh_size, shdr[shstrindex].sh_offset,
|
|
UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
|
|
&resid, td);
|
|
if (error)
|
|
goto out;
|
|
if (resid != 0){
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/* Size up code/data(progbits) and bss(nobits). */
|
|
alignmask = 0;
|
|
for (i = 0; i < hdr->e_shnum; i++) {
|
|
switch (shdr[i].sh_type) {
|
|
case SHT_PROGBITS:
|
|
case SHT_NOBITS:
|
|
alignmask = shdr[i].sh_addralign - 1;
|
|
mapsize += alignmask;
|
|
mapsize &= ~alignmask;
|
|
mapsize += shdr[i].sh_size;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* We know how much space we need for the text/data/bss/etc.
|
|
* This stuff needs to be in a single chunk so that profiling etc
|
|
* can get the bounds and gdb can associate offsets with modules
|
|
*/
|
|
ef->object = vm_object_allocate(OBJT_DEFAULT,
|
|
round_page(mapsize) >> PAGE_SHIFT);
|
|
if (ef->object == NULL) {
|
|
error = ENOMEM;
|
|
goto out;
|
|
}
|
|
ef->address = (caddr_t) vm_map_min(kernel_map);
|
|
error = vm_map_find(kernel_map, ef->object, 0, &mapbase,
|
|
round_page(mapsize), TRUE, VM_PROT_ALL, VM_PROT_ALL, FALSE);
|
|
if (error) {
|
|
vm_object_deallocate(ef->object);
|
|
ef->object = 0;
|
|
goto out;
|
|
}
|
|
|
|
/* Wire the pages */
|
|
error = vm_map_wire(kernel_map, mapbase,
|
|
mapbase + round_page(mapsize),
|
|
VM_MAP_WIRE_SYSTEM|VM_MAP_WIRE_NOHOLES);
|
|
if (error != KERN_SUCCESS) {
|
|
error = ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
/* Inform the kld system about the situation */
|
|
lf->address = ef->address = (caddr_t)mapbase;
|
|
lf->size = mapsize;
|
|
|
|
/*
|
|
* Now load code/data(progbits), zero bss(nobits), allocate space for
|
|
* and load relocs
|
|
*/
|
|
pb = 0;
|
|
rl = 0;
|
|
ra = 0;
|
|
alignmask = 0;
|
|
for (i = 0; i < hdr->e_shnum; i++) {
|
|
switch (shdr[i].sh_type) {
|
|
case SHT_PROGBITS:
|
|
case SHT_NOBITS:
|
|
alignmask = shdr[i].sh_addralign - 1;
|
|
mapbase += alignmask;
|
|
mapbase &= ~alignmask;
|
|
ef->progtab[pb].addr = (void *)(uintptr_t)mapbase;
|
|
if (shdr[i].sh_type == SHT_PROGBITS) {
|
|
ef->progtab[pb].name = "<<PROGBITS>>";
|
|
error = vn_rdwr(UIO_READ, nd.ni_vp,
|
|
ef->progtab[pb].addr,
|
|
shdr[i].sh_size, shdr[i].sh_offset,
|
|
UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred,
|
|
NOCRED, &resid, td);
|
|
if (error)
|
|
goto out;
|
|
if (resid != 0){
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
} else {
|
|
ef->progtab[pb].name = "<<NOBITS>>";
|
|
bzero(ef->progtab[pb].addr, shdr[i].sh_size);
|
|
}
|
|
ef->progtab[pb].size = shdr[i].sh_size;
|
|
ef->progtab[pb].sec = i;
|
|
if (ef->shstrtab && shdr[i].sh_name != 0)
|
|
ef->progtab[pb].name =
|
|
ef->shstrtab + shdr[i].sh_name;
|
|
|
|
/* Update all symbol values with the offset. */
|
|
for (j = 0; j < ef->ddbsymcnt; j++) {
|
|
es = &ef->ddbsymtab[j];
|
|
if (es->st_shndx != i)
|
|
continue;
|
|
es->st_value += (Elf_Addr)ef->progtab[pb].addr;
|
|
}
|
|
mapbase += shdr[i].sh_size;
|
|
pb++;
|
|
break;
|
|
case SHT_REL:
|
|
ef->reltab[rl].rel = malloc(shdr[i].sh_size, M_LINKER,
|
|
M_WAITOK);
|
|
ef->reltab[rl].nrel = shdr[i].sh_size / sizeof(Elf_Rel);
|
|
ef->reltab[rl].sec = shdr[i].sh_info;
|
|
error = vn_rdwr(UIO_READ, nd.ni_vp,
|
|
(void *)ef->reltab[rl].rel,
|
|
shdr[i].sh_size, shdr[i].sh_offset,
|
|
UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
|
|
&resid, td);
|
|
if (error)
|
|
goto out;
|
|
if (resid != 0){
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
rl++;
|
|
break;
|
|
case SHT_RELA:
|
|
ef->relatab[ra].rela = malloc(shdr[i].sh_size, M_LINKER,
|
|
M_WAITOK);
|
|
ef->relatab[ra].nrela =
|
|
shdr[i].sh_size / sizeof(Elf_Rela);
|
|
ef->relatab[ra].sec = shdr[i].sh_info;
|
|
error = vn_rdwr(UIO_READ, nd.ni_vp,
|
|
(void *)ef->relatab[ra].rela,
|
|
shdr[i].sh_size, shdr[i].sh_offset,
|
|
UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
|
|
&resid, td);
|
|
if (error)
|
|
goto out;
|
|
if (resid != 0){
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
ra++;
|
|
break;
|
|
}
|
|
}
|
|
if (pb != ef->nprogtab)
|
|
panic("lost progbits");
|
|
if (rl != ef->nrel)
|
|
panic("lost rel");
|
|
if (ra != ef->nrela)
|
|
panic("lost rela");
|
|
if (mapbase != (vm_offset_t)ef->address + mapsize)
|
|
panic("mapbase 0x%lx != address %p + mapsize 0x%lx (0x%lx)\n",
|
|
mapbase, ef->address, mapsize,
|
|
(vm_offset_t)ef->address + mapsize);
|
|
|
|
/* Local intra-module relocations */
|
|
link_elf_reloc_local(lf);
|
|
|
|
/* Pull in dependencies */
|
|
error = linker_load_dependencies(lf);
|
|
if (error)
|
|
goto out;
|
|
|
|
/* External relocations */
|
|
error = relocate_file(ef);
|
|
if (error)
|
|
goto out;
|
|
|
|
/* Notify MD code that a module is being loaded. */
|
|
error = elf_cpu_load_file(lf);
|
|
if (error)
|
|
goto out;
|
|
|
|
*result = lf;
|
|
|
|
out:
|
|
if (error && lf)
|
|
linker_file_unload(lf, LINKER_UNLOAD_FORCE);
|
|
if (hdr)
|
|
free(hdr, M_LINKER);
|
|
VOP_UNLOCK(nd.ni_vp, 0, td);
|
|
vn_close(nd.ni_vp, FREAD, td->td_ucred, td);
|
|
|
|
return error;
|
|
}
|
|
|
|
static void
|
|
link_elf_unload_file(linker_file_t file)
|
|
{
|
|
elf_file_t ef = (elf_file_t) file;
|
|
int i;
|
|
|
|
/* Notify MD code that a module is being unloaded. */
|
|
elf_cpu_unload_file(file);
|
|
|
|
if (ef->preloaded) {
|
|
if (ef->reltab)
|
|
free(ef->reltab, M_LINKER);
|
|
if (ef->relatab)
|
|
free(ef->relatab, M_LINKER);
|
|
if (ef->progtab)
|
|
free(ef->progtab, M_LINKER);
|
|
if (file->filename != NULL)
|
|
preload_delete_name(file->filename);
|
|
/* XXX reclaim module memory? */
|
|
return;
|
|
}
|
|
|
|
for (i = 0; i < ef->nrel; i++)
|
|
if (ef->reltab[i].rel)
|
|
free(ef->reltab[i].rel, M_LINKER);
|
|
for (i = 0; i < ef->nrela; i++)
|
|
if (ef->relatab[i].rela)
|
|
free(ef->relatab[i].rela, M_LINKER);
|
|
if (ef->reltab)
|
|
free(ef->reltab, M_LINKER);
|
|
if (ef->relatab)
|
|
free(ef->relatab, M_LINKER);
|
|
if (ef->progtab)
|
|
free(ef->progtab, M_LINKER);
|
|
|
|
if (ef->object) {
|
|
vm_map_remove(kernel_map, (vm_offset_t) ef->address,
|
|
(vm_offset_t) ef->address +
|
|
(ef->object->size << PAGE_SHIFT));
|
|
}
|
|
if (ef->e_shdr)
|
|
free(ef->e_shdr, M_LINKER);
|
|
if (ef->ddbsymtab)
|
|
free(ef->ddbsymtab, M_LINKER);
|
|
if (ef->ddbstrtab)
|
|
free(ef->ddbstrtab, M_LINKER);
|
|
if (ef->shstrtab)
|
|
free(ef->shstrtab, M_LINKER);
|
|
}
|
|
|
|
static const char *
|
|
symbol_name(elf_file_t ef, Elf_Word r_info)
|
|
{
|
|
const Elf_Sym *ref;
|
|
|
|
if (ELF_R_SYM(r_info)) {
|
|
ref = ef->ddbsymtab + ELF_R_SYM(r_info);
|
|
return ef->ddbstrtab + ref->st_name;
|
|
} else
|
|
return NULL;
|
|
}
|
|
|
|
static Elf_Addr
|
|
findbase(elf_file_t ef, int sec)
|
|
{
|
|
int i;
|
|
Elf_Addr base = 0;
|
|
|
|
for (i = 0; i < ef->nprogtab; i++) {
|
|
if (sec == ef->progtab[i].sec) {
|
|
base = (Elf_Addr)ef->progtab[i].addr;
|
|
break;
|
|
}
|
|
}
|
|
return base;
|
|
}
|
|
|
|
static int
|
|
relocate_file(elf_file_t ef)
|
|
{
|
|
const Elf_Rel *rellim;
|
|
const Elf_Rel *rel;
|
|
const Elf_Rela *relalim;
|
|
const Elf_Rela *rela;
|
|
const char *symname;
|
|
const Elf_Sym *sym;
|
|
int i;
|
|
Elf_Word symidx;
|
|
Elf_Addr base;
|
|
|
|
|
|
/* Perform relocations without addend if there are any: */
|
|
for (i = 0; i < ef->nrel; i++) {
|
|
rel = ef->reltab[i].rel;
|
|
if (rel == NULL)
|
|
panic("lost a reltab!");
|
|
rellim = rel + ef->reltab[i].nrel;
|
|
base = findbase(ef, ef->reltab[i].sec);
|
|
if (base == 0)
|
|
panic("lost base for reltab");
|
|
for ( ; rel < rellim; rel++) {
|
|
symidx = ELF_R_SYM(rel->r_info);
|
|
if (symidx >= ef->ddbsymcnt)
|
|
continue;
|
|
sym = ef->ddbsymtab + symidx;
|
|
/* Local relocs are already done */
|
|
if (ELF_ST_BIND(sym->st_info) == STB_LOCAL)
|
|
continue;
|
|
if (elf_reloc(&ef->lf, base, rel, ELF_RELOC_REL,
|
|
elf_obj_lookup)) {
|
|
symname = symbol_name(ef, rel->r_info);
|
|
printf("link_elf_obj: symbol %s undefined\n",
|
|
symname);
|
|
return ENOENT;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Perform relocations with addend if there are any: */
|
|
for (i = 0; i < ef->nrela; i++) {
|
|
rela = ef->relatab[i].rela;
|
|
if (rela == NULL)
|
|
panic("lost a relatab!");
|
|
relalim = rela + ef->relatab[i].nrela;
|
|
base = findbase(ef, ef->relatab[i].sec);
|
|
if (base == 0)
|
|
panic("lost base for relatab");
|
|
for ( ; rela < relalim; rela++) {
|
|
symidx = ELF_R_SYM(rela->r_info);
|
|
if (symidx >= ef->ddbsymcnt)
|
|
continue;
|
|
sym = ef->ddbsymtab + symidx;
|
|
/* Local relocs are already done */
|
|
if (ELF_ST_BIND(sym->st_info) == STB_LOCAL)
|
|
continue;
|
|
if (elf_reloc(&ef->lf, base, rela, ELF_RELOC_RELA,
|
|
elf_obj_lookup)) {
|
|
symname = symbol_name(ef, rela->r_info);
|
|
printf("link_elf_obj: symbol %s undefined\n",
|
|
symname);
|
|
return ENOENT;
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
link_elf_lookup_symbol(linker_file_t lf, const char *name, c_linker_sym_t *sym)
|
|
{
|
|
elf_file_t ef = (elf_file_t) lf;
|
|
const Elf_Sym *symp;
|
|
const char *strp;
|
|
int i;
|
|
|
|
for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) {
|
|
strp = ef->ddbstrtab + symp->st_name;
|
|
if (symp->st_shndx != SHN_UNDEF && strcmp(name, strp) == 0) {
|
|
*sym = (c_linker_sym_t) symp;
|
|
return 0;
|
|
}
|
|
}
|
|
return ENOENT;
|
|
}
|
|
|
|
static int
|
|
link_elf_symbol_values(linker_file_t lf, c_linker_sym_t sym,
|
|
linker_symval_t *symval)
|
|
{
|
|
elf_file_t ef = (elf_file_t) lf;
|
|
const Elf_Sym *es = (const Elf_Sym*) sym;
|
|
|
|
if (es >= ef->ddbsymtab && es < (ef->ddbsymtab + ef->ddbsymcnt)) {
|
|
symval->name = ef->ddbstrtab + es->st_name;
|
|
symval->value = (caddr_t)es->st_value;
|
|
symval->size = es->st_size;
|
|
return 0;
|
|
}
|
|
return ENOENT;
|
|
}
|
|
|
|
static int
|
|
link_elf_search_symbol(linker_file_t lf, caddr_t value,
|
|
c_linker_sym_t *sym, long *diffp)
|
|
{
|
|
elf_file_t ef = (elf_file_t) lf;
|
|
u_long off = (uintptr_t) (void *) value;
|
|
u_long diff = off;
|
|
u_long st_value;
|
|
const Elf_Sym *es;
|
|
const Elf_Sym *best = 0;
|
|
int i;
|
|
|
|
for (i = 0, es = ef->ddbsymtab; i < ef->ddbsymcnt; i++, es++) {
|
|
if (es->st_name == 0)
|
|
continue;
|
|
st_value = es->st_value;
|
|
if (off >= st_value) {
|
|
if (off - st_value < diff) {
|
|
diff = off - st_value;
|
|
best = es;
|
|
if (diff == 0)
|
|
break;
|
|
} else if (off - st_value == diff) {
|
|
best = es;
|
|
}
|
|
}
|
|
}
|
|
if (best == 0)
|
|
*diffp = off;
|
|
else
|
|
*diffp = diff;
|
|
*sym = (c_linker_sym_t) best;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Look up a linker set on an ELF system.
|
|
*/
|
|
static int
|
|
link_elf_lookup_set(linker_file_t lf, const char *name,
|
|
void ***startp, void ***stopp, int *countp)
|
|
{
|
|
elf_file_t ef = (elf_file_t)lf;
|
|
void **start, **stop;
|
|
int i, count;
|
|
|
|
/* Relative to section number */
|
|
for (i = 0; i < ef->nprogtab; i++) {
|
|
if ((strncmp(ef->progtab[i].name, "set_", 4) == 0) &&
|
|
strcmp(ef->progtab[i].name + 4, name) == 0) {
|
|
start = (void **)ef->progtab[i].addr;
|
|
stop = (void **)((char *)ef->progtab[i].addr +
|
|
ef->progtab[i].size);
|
|
count = stop - start;
|
|
if (startp)
|
|
*startp = start;
|
|
if (stopp)
|
|
*stopp = stop;
|
|
if (countp)
|
|
*countp = count;
|
|
return (0);
|
|
}
|
|
}
|
|
return (ESRCH);
|
|
}
|
|
|
|
static int
|
|
link_elf_each_function_name(linker_file_t file,
|
|
int (*callback)(const char *, void *), void *opaque)
|
|
{
|
|
elf_file_t ef = (elf_file_t)file;
|
|
const Elf_Sym *symp;
|
|
int i, error;
|
|
|
|
/* Exhaustive search */
|
|
for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) {
|
|
if (symp->st_value != 0 &&
|
|
ELF_ST_TYPE(symp->st_info) == STT_FUNC) {
|
|
error = callback(ef->ddbstrtab + symp->st_name, opaque);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Symbol lookup function that can be used when the symbol index is known (ie
|
|
* in relocations). It uses the symbol index instead of doing a fully fledged
|
|
* hash table based lookup when such is valid. For example for local symbols.
|
|
* This is not only more efficient, it's also more correct. It's not always
|
|
* the case that the symbol can be found through the hash table.
|
|
*/
|
|
static Elf_Addr
|
|
elf_obj_lookup(linker_file_t lf, Elf_Word symidx, int deps)
|
|
{
|
|
elf_file_t ef = (elf_file_t)lf;
|
|
const Elf_Sym *sym;
|
|
const char *symbol;
|
|
Elf_Addr ret;
|
|
|
|
/* Don't even try to lookup the symbol if the index is bogus. */
|
|
if (symidx >= ef->ddbsymcnt)
|
|
return (0);
|
|
|
|
sym = ef->ddbsymtab + symidx;
|
|
|
|
/* Quick answer if there is a definition included. */
|
|
if (sym->st_shndx != SHN_UNDEF)
|
|
return (sym->st_value);
|
|
|
|
/* If we get here, then it is undefined and needs a lookup. */
|
|
switch (ELF_ST_BIND(sym->st_info)) {
|
|
case STB_LOCAL:
|
|
/* Local, but undefined? huh? */
|
|
return (0);
|
|
|
|
case STB_GLOBAL:
|
|
/* Relative to Data or Function name */
|
|
symbol = ef->ddbstrtab + sym->st_name;
|
|
|
|
/* Force a lookup failure if the symbol name is bogus. */
|
|
if (*symbol == 0)
|
|
return (0);
|
|
ret = ((Elf_Addr)linker_file_lookup_symbol(lf, symbol, deps));
|
|
return ret;
|
|
|
|
case STB_WEAK:
|
|
printf("link_elf_obj: Weak symbols not supported\n");
|
|
return (0);
|
|
|
|
default:
|
|
return (0);
|
|
}
|
|
}
|
|
|
|
static void
|
|
link_elf_reloc_local(linker_file_t lf)
|
|
{
|
|
elf_file_t ef = (elf_file_t)lf;
|
|
const Elf_Rel *rellim;
|
|
const Elf_Rel *rel;
|
|
const Elf_Rela *relalim;
|
|
const Elf_Rela *rela;
|
|
const Elf_Sym *sym;
|
|
Elf_Addr base;
|
|
int i;
|
|
Elf_Word symidx;
|
|
|
|
/* Perform relocations without addend if there are any: */
|
|
for (i = 0; i < ef->nrel; i++) {
|
|
rel = ef->reltab[i].rel;
|
|
if (rel == NULL)
|
|
panic("lost a reltab!");
|
|
rellim = rel + ef->reltab[i].nrel;
|
|
base = findbase(ef, ef->reltab[i].sec);
|
|
if (base == 0)
|
|
panic("lost base for reltab");
|
|
for ( ; rel < rellim; rel++) {
|
|
symidx = ELF_R_SYM(rel->r_info);
|
|
if (symidx >= ef->ddbsymcnt)
|
|
continue;
|
|
sym = ef->ddbsymtab + symidx;
|
|
/* Only do local relocs */
|
|
if (ELF_ST_BIND(sym->st_info) != STB_LOCAL)
|
|
continue;
|
|
elf_reloc_local(lf, base, rel, ELF_RELOC_REL,
|
|
elf_obj_lookup);
|
|
}
|
|
}
|
|
|
|
/* Perform relocations with addend if there are any: */
|
|
for (i = 0; i < ef->nrela; i++) {
|
|
rela = ef->relatab[i].rela;
|
|
if (rela == NULL)
|
|
panic("lost a relatab!");
|
|
relalim = rela + ef->relatab[i].nrela;
|
|
base = findbase(ef, ef->relatab[i].sec);
|
|
if (base == 0)
|
|
panic("lost base for relatab");
|
|
for ( ; rela < relalim; rela++) {
|
|
symidx = ELF_R_SYM(rela->r_info);
|
|
if (symidx >= ef->ddbsymcnt)
|
|
continue;
|
|
sym = ef->ddbsymtab + symidx;
|
|
/* Only do local relocs */
|
|
if (ELF_ST_BIND(sym->st_info) != STB_LOCAL)
|
|
continue;
|
|
elf_reloc_local(lf, base, rela, ELF_RELOC_RELA,
|
|
elf_obj_lookup);
|
|
}
|
|
}
|
|
}
|