1999-02-13 19:35:14 +03:00
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/* $NetBSD: reloc.c,v 1.8 1999/02/13 16:35:14 christos Exp $ */
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1996-12-16 23:37:55 +03:00
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/*
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* Copyright 1996 John D. Polstra.
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* Copyright 1996 Matt Thomas <matt@3am-software.com>
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by John Polstra.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Dynamic linker for ELF.
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*
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* John Polstra <jdp@polstra.com>.
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*/
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/mman.h>
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#include <dirent.h>
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#include "debug.h"
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#include "rtld.h"
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1999-01-10 21:18:56 +03:00
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#if defined(__alpha__) || defined(__powerpc__) || defined(__i386__)
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/*
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* XXX: These don't work for the alpha and i386; don't know about powerpc
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* The alpha and the i386 avoid the problem by compiling everything PIC.
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* These relocation are supposed to be writing the address of the
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* function to be called on the bss.rel or bss.rela segment, but:
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* - st_size == 0
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* - on the i386 at least the call instruction is a direct call
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* not an indirect call.
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*/
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1996-12-16 23:37:55 +03:00
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static int
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_rtld_do_copy_relocation(
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const Obj_Entry *dstobj,
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const Elf_RelA *rela)
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{
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void *dstaddr = (void *) (dstobj->relocbase + rela->r_offset);
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const Elf_Sym *dstsym = dstobj->symtab + ELF_R_SYM(rela->r_info);
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const char *name = dstobj->strtab + dstsym->st_name;
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unsigned long hash = _rtld_elf_hash(name);
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size_t size = dstsym->st_size;
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const void *srcaddr;
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const Elf_Sym *srcsym;
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Obj_Entry *srcobj;
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for (srcobj = dstobj->next; srcobj != NULL; srcobj = srcobj->next)
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if ((srcsym = _rtld_symlook_obj(name, hash, srcobj, false)) != NULL)
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break;
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if (srcobj == NULL) {
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_rtld_error("Undefined symbol \"%s\" referenced from COPY"
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" relocation in %s", name, dstobj->path);
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return -1;
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}
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srcaddr = (const void *) (srcobj->relocbase + srcsym->st_value);
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memcpy(dstaddr, srcaddr, size);
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1999-02-07 20:24:05 +03:00
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#ifdef RTLD_DEBUG_RELOC
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dbg("COPY %s %s %s --> src=%p dst=%p *dst= %p size %d",
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dstobj->path, srcobj->path, name, (void *)srcaddr, (void *)dstaddr,
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(void *)*(long *)dstaddr, size);
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#endif
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1996-12-16 23:37:55 +03:00
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return 0;
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}
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1999-01-10 21:18:56 +03:00
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#endif /* __alpha__ || __powerpc__ || __i386__ */
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1996-12-16 23:37:55 +03:00
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/*
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* Process the special R_xxx_COPY relocations in the main program. These
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* copy data from a shared object into a region in the main program's BSS
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* segment.
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*
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* Returns 0 on success, -1 on failure.
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*/
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int
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_rtld_do_copy_relocations(
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const Obj_Entry *dstobj)
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{
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assert(dstobj->mainprog); /* COPY relocations are invalid elsewhere */
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1999-01-10 21:18:56 +03:00
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#if defined(__alpha__) || defined(__powerpc__) || defined(__i386__)
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1996-12-16 23:37:55 +03:00
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if (dstobj->rel != NULL) {
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const Elf_Rel *rel;
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for (rel = dstobj->rel; rel < dstobj->rellim; ++rel) {
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if (ELF_R_TYPE(rel->r_info) == R_TYPE(COPY)) {
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Elf_RelA ourrela;
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ourrela.r_info = rel->r_info;
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ourrela.r_offset = rel->r_offset;
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ourrela.r_addend = 0;
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if (_rtld_do_copy_relocation(dstobj, &ourrela) < 0)
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return -1;
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}
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}
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}
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if (dstobj->rela != NULL) {
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const Elf_RelA *rela;
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for (rela = dstobj->rela; rela < dstobj->relalim; ++rela) {
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if (ELF_R_TYPE(rela->r_info) == R_TYPE(COPY)) {
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if (_rtld_do_copy_relocation(dstobj, rela) < 0)
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return -1;
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}
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}
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}
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1999-01-10 21:18:56 +03:00
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#endif /* __alpha__ || __powerpc__ || __i386__ */
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1996-12-16 23:37:55 +03:00
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return 0;
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}
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static int
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_rtld_relocate_nonplt_object(
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const Obj_Entry *obj,
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const Elf_RelA *rela)
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{
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Elf_Addr *where = (Elf_Addr *) (obj->relocbase + rela->r_offset);
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switch (ELF_R_TYPE(rela->r_info)) {
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case R_TYPE(NONE):
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break;
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#ifdef __i386__
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1999-01-10 21:18:56 +03:00
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case R_TYPE(GOT32): {
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1996-12-16 23:37:55 +03:00
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const Elf_Sym *def;
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const Obj_Entry *defobj;
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def = _rtld_find_symdef(_rtld_objlist, rela->r_info, NULL, obj, &defobj, false);
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if (def == NULL)
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return -1;
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1999-02-07 20:24:05 +03:00
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if (*where != (Elf_Addr) (defobj->relocbase + def->st_value))
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*where = (Elf_Addr) (defobj->relocbase + def->st_value);
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#ifdef RTLD_DEBUG_RELOC
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dbg("GOT32 %s in %s --> %p in %s",
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defobj->strtab + def->st_name, obj->path,
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(void *)*where, defobj->path);
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#endif
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1996-12-16 23:37:55 +03:00
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break;
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}
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1999-01-10 21:18:56 +03:00
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case R_TYPE(PC32):
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1996-12-16 23:37:55 +03:00
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/*
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* I don't think the dynamic linker should ever see this
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* type of relocation. But the binutils-2.6 tools sometimes
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* generate it.
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*/
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{
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const Elf_Sym *def;
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const Obj_Entry *defobj;
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def = _rtld_find_symdef(_rtld_objlist, rela->r_info, NULL, obj, &defobj, false);
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if (def == NULL)
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return -1;
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*where += (Elf_Addr) (defobj->relocbase + def->st_value)
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- (Elf_Addr) where;
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1999-02-07 20:24:05 +03:00
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#ifdef RTLD_DEBUG_RELOC
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dbg("PC32 %s in %s --> %p in %s",
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defobj->strtab + def->st_name, obj->path,
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(void *)*where, defobj->path);
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#endif
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1996-12-16 23:37:55 +03:00
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break;
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}
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1999-01-10 21:18:56 +03:00
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case R_TYPE(32): {
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const Elf_Sym *def;
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const Obj_Entry *defobj;
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def = _rtld_find_symdef(_rtld_objlist, rela->r_info, NULL, obj, &defobj, false);
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if (def == NULL)
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return -1;
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*where += (Elf_Addr)(defobj->relocbase + def->st_value);
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1999-02-07 20:24:05 +03:00
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#ifdef RTLD_DEBUG_RELOC
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dbg("32 %s in %s --> %p in %s",
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defobj->strtab + def->st_name, obj->path,
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(void *)*where, defobj->path);
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#endif
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1999-01-10 21:18:56 +03:00
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break;
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}
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#endif /* __i386__ */
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1996-12-16 23:37:55 +03:00
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#ifdef __alpha__
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case R_ALPHA_REFQUAD: {
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const Elf_Sym *def;
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const Obj_Entry *defobj;
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Elf_Addr tmp_value;
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def = _rtld_find_symdef(_rtld_objlist, rela->r_info, NULL, obj, &defobj, false);
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if (def == NULL)
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return -1;
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tmp_value = (Elf_Addr) (defobj->relocbase + def->st_value)
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+ *where + rela->r_addend;
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if (*where != tmp_value)
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*where = tmp_value;
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1999-02-07 20:24:05 +03:00
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#ifdef RTLD_DEBUG_RELOC
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dbg("REFQUAD %s in %s --> %p in %s",
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defobj->strtab + def->st_name, obj->path,
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(void *)*where, defobj->path);
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#endif
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1996-12-16 23:37:55 +03:00
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break;
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}
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1999-01-10 21:18:56 +03:00
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#endif /* __alpha__ */
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1996-12-16 23:37:55 +03:00
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1999-01-10 21:18:56 +03:00
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#if defined(__i386__) || defined(__alpha__)
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1996-12-16 23:37:55 +03:00
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case R_TYPE(GLOB_DAT):
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{
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const Elf_Sym *def;
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const Obj_Entry *defobj;
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def = _rtld_find_symdef(_rtld_objlist, rela->r_info, NULL, obj, &defobj, false);
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if (def == NULL)
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return -1;
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if (*where != (Elf_Addr) (defobj->relocbase + def->st_value))
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*where = (Elf_Addr) (defobj->relocbase + def->st_value);
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1999-02-07 20:24:05 +03:00
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#ifdef RTLD_DEBUG_RELOC
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dbg("GLOB_DAT %s in %s --> %p in %s",
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defobj->strtab + def->st_name, obj->path,
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(void *)*where, defobj->path);
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#endif
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1996-12-16 23:37:55 +03:00
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break;
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}
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case R_TYPE(RELATIVE): {
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extern Elf_Addr _GLOBAL_OFFSET_TABLE_[];
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extern Elf_Dyn _DYNAMIC;
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if (obj != &_rtld_objself ||
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(caddr_t)where < (caddr_t)_GLOBAL_OFFSET_TABLE_ ||
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1999-02-07 20:24:05 +03:00
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(caddr_t)where >= (caddr_t)&_DYNAMIC) {
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1996-12-16 23:37:55 +03:00
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*where += (Elf_Addr) obj->relocbase;
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1999-02-07 20:24:05 +03:00
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#ifdef RTLD_DEBUG_RELOC
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dbg("RELATIVE in %s --> %p", obj->path, (void *)*where);
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#endif
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}
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#ifdef RTLD_DEBUG_RELOC
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else
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dbg("RELATIVE in %s stays at %p", obj->path, (void *)*where);
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#endif
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1996-12-16 23:37:55 +03:00
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break;
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}
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case R_TYPE(COPY): {
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/*
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* These are deferred until all other relocations have
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* been done. All we do here is make sure that the COPY
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* relocation is not in a shared library. They are allowed
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* only in executable files.
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*/
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if (!obj->mainprog) {
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_rtld_error("%s: Unexpected R_COPY relocation in shared library",
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obj->path);
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return -1;
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}
|
1999-02-07 20:24:05 +03:00
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#ifdef RTLD_DEBUG_RELOC
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dbg("COPY (avoid in main)");
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#endif
|
1996-12-16 23:37:55 +03:00
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break;
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}
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1999-01-10 21:18:56 +03:00
|
|
|
|
#endif /* __i386__ || __alpha__ */
|
1998-03-25 07:12:32 +03:00
|
|
|
|
|
|
|
|
|
#ifdef __mips__
|
|
|
|
|
case R_TYPE(REL32): {
|
|
|
|
|
/* 32-bit PC-relative reference */
|
|
|
|
|
|
|
|
|
|
const Elf_Sym *def;
|
|
|
|
|
const Obj_Entry *defobj;
|
|
|
|
|
|
|
|
|
|
def = obj->symtab + ELF_R_SYM(rela->r_info);
|
|
|
|
|
|
|
|
|
|
if (ELF_SYM_BIND(def->st_info) == Elf_estb_local &&
|
|
|
|
|
(ELF_SYM_TYPE(def->st_info) == Elf_estt_section ||
|
|
|
|
|
ELF_SYM_TYPE(def->st_info) == Elf_estt_notype)) {
|
|
|
|
|
*where += (Elf_Addr) obj->relocbase;
|
1999-02-07 20:24:05 +03:00
|
|
|
|
#ifdef RTLD_DEBUG_RELOC
|
|
|
|
|
dbg("REL32 in %s --> %p", obj->path, (void *)*where);
|
|
|
|
|
#endif
|
1998-03-25 07:12:32 +03:00
|
|
|
|
} else {
|
|
|
|
|
/* XXX maybe do something re: bootstrapping? */
|
|
|
|
|
def = _rtld_find_symdef(_rtld_objlist, rela->r_info, NULL, obj,
|
|
|
|
|
&defobj, false);
|
|
|
|
|
if (def == NULL)
|
|
|
|
|
return -1;
|
|
|
|
|
*where += (Elf_Addr)(defobj->relocbase + def->st_value);
|
1999-02-07 20:24:05 +03:00
|
|
|
|
#ifdef RTLD_DEBUG_RELOC
|
|
|
|
|
dbg("REL32 %s in %s --> %p in %s",
|
|
|
|
|
defobj->strtab + def->st_name, obj->path,
|
|
|
|
|
(void *)*where, defobj->path);
|
|
|
|
|
#endif
|
1998-03-25 07:12:32 +03:00
|
|
|
|
}
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
#endif /* mips */
|
1996-12-16 23:37:55 +03:00
|
|
|
|
|
1998-11-24 14:34:30 +03:00
|
|
|
|
#ifdef __powerpc__
|
|
|
|
|
case R_TYPE(32): /* word32 S + A */
|
|
|
|
|
case R_TYPE(GLOB_DAT): { /* word32 S + A */
|
|
|
|
|
const Elf_Sym *def;
|
|
|
|
|
const Obj_Entry *defobj;
|
|
|
|
|
Elf_Addr x;
|
|
|
|
|
|
|
|
|
|
def = _rtld_find_symdef(_rtld_objlist, rela->r_info, NULL, obj, &defobj, false);
|
|
|
|
|
if (def == NULL)
|
|
|
|
|
return -1;
|
|
|
|
|
|
|
|
|
|
x = (Elf_Addr)(defobj->relocbase + def->st_value + rela->r_addend);
|
|
|
|
|
|
|
|
|
|
if (*where != x)
|
|
|
|
|
*where = x;
|
1999-02-07 20:24:05 +03:00
|
|
|
|
#ifdef RTLD_DEBUG_RELOC
|
|
|
|
|
dbg("32/GLOB_DAT %s in %s --> %p in %s",
|
|
|
|
|
defobj->strtab + def->st_name, obj->path,
|
|
|
|
|
(void *)*where, defobj->path);
|
|
|
|
|
#endif
|
1998-11-24 14:34:30 +03:00
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
case R_TYPE(COPY):
|
1999-02-07 20:24:05 +03:00
|
|
|
|
#ifdef RTLD_DEBUG_RELOC
|
|
|
|
|
dbg("COPY");
|
|
|
|
|
#endif
|
1998-11-24 14:34:30 +03:00
|
|
|
|
break;
|
|
|
|
|
|
|
|
|
|
case R_TYPE(JMP_SLOT):
|
1999-02-07 20:24:05 +03:00
|
|
|
|
#ifdef RTLD_DEBUG_RELOC
|
|
|
|
|
dbg("JMP_SLOT");
|
|
|
|
|
#endif
|
1998-11-24 14:34:30 +03:00
|
|
|
|
break;
|
|
|
|
|
|
|
|
|
|
case R_TYPE(RELATIVE): { /* word32 B + A */
|
|
|
|
|
if (obj == &_rtld_objself &&
|
|
|
|
|
*where == (Elf_Addr)obj->relocbase + rela->r_addend)
|
|
|
|
|
break; /* GOT - already done */
|
|
|
|
|
|
|
|
|
|
*where = (Elf_Addr)obj->relocbase + rela->r_addend;
|
1999-02-07 20:24:05 +03:00
|
|
|
|
#ifdef RTLD_DEBUG_RELOC
|
|
|
|
|
dbg("RELATIVE in %s --> %p", obj->path, (void *)*where);
|
|
|
|
|
#endif
|
1998-11-24 14:34:30 +03:00
|
|
|
|
break;
|
|
|
|
|
}
|
1999-01-10 21:18:56 +03:00
|
|
|
|
#endif /* __powerpc__ */
|
1998-11-24 14:34:30 +03:00
|
|
|
|
|
1996-12-16 23:37:55 +03:00
|
|
|
|
default: {
|
|
|
|
|
const Elf_Sym *def;
|
|
|
|
|
const Obj_Entry *defobj;
|
|
|
|
|
|
|
|
|
|
def = _rtld_find_symdef(_rtld_objlist, rela->r_info, NULL, obj, &defobj, true);
|
1999-01-12 02:12:16 +03:00
|
|
|
|
dbg("sym = %lu, type = %lu, offset = %p, addend = %p, contents = %p, symbol = %s",
|
|
|
|
|
(u_long)ELF_R_SYM(rela->r_info), (u_long)ELF_R_TYPE(rela->r_info),
|
1999-01-10 21:18:56 +03:00
|
|
|
|
(void *)rela->r_offset, (void *)rela->r_addend, (void *)*where,
|
1996-12-16 23:37:55 +03:00
|
|
|
|
def ? defobj->strtab + def->st_name : "??");
|
|
|
|
|
_rtld_error("%s: Unsupported relocation type %d in non-PLT relocations\n",
|
|
|
|
|
obj->path, ELF_R_TYPE(rela->r_info));
|
|
|
|
|
return -1;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
|
_rtld_relocate_plt_object(
|
|
|
|
|
const Obj_Entry *obj,
|
|
|
|
|
const Elf_RelA *rela,
|
|
|
|
|
bool bind_now)
|
|
|
|
|
{
|
|
|
|
|
Elf_Addr *where = (Elf_Addr *) (obj->relocbase + rela->r_offset);
|
|
|
|
|
Elf_Addr new_value;
|
|
|
|
|
|
|
|
|
|
/* Fully resolve procedure addresses now */
|
1998-03-25 07:12:32 +03:00
|
|
|
|
|
1998-11-24 14:34:30 +03:00
|
|
|
|
#if defined(__powerpc__)
|
|
|
|
|
return _rtld_reloc_powerpc_plt(obj, rela, bind_now);
|
|
|
|
|
#endif
|
|
|
|
|
|
1999-01-10 21:18:56 +03:00
|
|
|
|
#if defined(__alpha__) || defined(__i386__) /* (jrs) */
|
1996-12-16 23:37:55 +03:00
|
|
|
|
if (bind_now || obj->pltgot == NULL) {
|
|
|
|
|
const Elf_Sym *def;
|
|
|
|
|
const Obj_Entry *defobj;
|
|
|
|
|
|
|
|
|
|
assert(ELF_R_TYPE(rela->r_info) == R_TYPE(JMP_SLOT));
|
|
|
|
|
|
|
|
|
|
def = _rtld_find_symdef(_rtld_objlist, rela->r_info, NULL, obj, &defobj, true);
|
|
|
|
|
if (def == NULL)
|
|
|
|
|
return -1;
|
|
|
|
|
|
|
|
|
|
new_value = (Elf_Addr) (defobj->relocbase + def->st_value);
|
1999-02-07 20:24:05 +03:00
|
|
|
|
#ifdef RTLD_DEBUG_RELOC
|
|
|
|
|
dbg("bind now %d/fixup in %s --> old=%p new=%p",
|
|
|
|
|
(int)bind_now,
|
|
|
|
|
defobj->strtab + def->st_name,
|
|
|
|
|
(void *)*where, (void *)new_value);
|
1996-12-16 23:37:55 +03:00
|
|
|
|
#endif
|
1998-03-25 07:12:32 +03:00
|
|
|
|
} else
|
|
|
|
|
#endif /* __alpha__ (jrs) */
|
1999-01-10 21:18:56 +03:00
|
|
|
|
if (!obj->mainprog) {
|
1996-12-16 23:37:55 +03:00
|
|
|
|
/* Just relocate the GOT slots pointing into the PLT */
|
|
|
|
|
new_value = *where + (Elf_Addr) (obj->relocbase);
|
1999-02-07 20:24:05 +03:00
|
|
|
|
#ifdef RTLD_DEBUG_RELOC
|
|
|
|
|
dbg("fixup !main in %s --> %p", obj->path, (void *)*where);
|
1999-01-10 21:18:56 +03:00
|
|
|
|
#endif
|
1996-12-16 23:37:55 +03:00
|
|
|
|
} else {
|
1999-02-12 20:52:07 +03:00
|
|
|
|
return 0;
|
1996-12-16 23:37:55 +03:00
|
|
|
|
}
|
|
|
|
|
/*
|
|
|
|
|
* Since this page is probably copy-on-write, let's not write
|
|
|
|
|
* it unless we really really have to.
|
|
|
|
|
*/
|
|
|
|
|
if (*where != new_value)
|
|
|
|
|
*where = new_value;
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
caddr_t
|
|
|
|
|
_rtld_bind(
|
|
|
|
|
const Obj_Entry *obj,
|
|
|
|
|
Elf_Word reloff)
|
|
|
|
|
{
|
|
|
|
|
const Elf_RelA *rela;
|
|
|
|
|
Elf_RelA ourrela;
|
|
|
|
|
|
|
|
|
|
if (obj->pltrel != NULL) {
|
|
|
|
|
ourrela.r_info = ((const Elf_Rel *) ((caddr_t) obj->pltrel + reloff))->r_info;
|
|
|
|
|
ourrela.r_offset = ((const Elf_Rel *) ((caddr_t) obj->pltrel + reloff))->r_offset;
|
|
|
|
|
rela = &ourrela;
|
|
|
|
|
} else {
|
|
|
|
|
rela = (const Elf_RelA *) ((caddr_t) obj->pltrela + reloff);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (_rtld_relocate_plt_object(obj, rela, true) < 0)
|
|
|
|
|
_rtld_die();
|
|
|
|
|
|
|
|
|
|
return *(caddr_t *)(obj->relocbase + rela->r_offset);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Relocate newly-loaded shared objects. The argument is a pointer to
|
|
|
|
|
* the Obj_Entry for the first such object. All objects from the first
|
|
|
|
|
* to the end of the list of objects are relocated. Returns 0 on success,
|
|
|
|
|
* or -1 on failure.
|
|
|
|
|
*/
|
|
|
|
|
int
|
|
|
|
|
_rtld_relocate_objects(
|
|
|
|
|
Obj_Entry *first,
|
|
|
|
|
bool bind_now)
|
|
|
|
|
{
|
|
|
|
|
Obj_Entry *obj;
|
|
|
|
|
int ok = 1;
|
|
|
|
|
|
|
|
|
|
for (obj = first; obj != NULL; obj = obj->next) {
|
|
|
|
|
|
|
|
|
|
if (obj->nbuckets == 0 || obj->nchains == 0
|
|
|
|
|
|| obj->buckets == NULL || obj->symtab == NULL
|
|
|
|
|
|| obj->strtab == NULL) {
|
|
|
|
|
_rtld_error("%s: Shared object has no run-time symbol table",
|
|
|
|
|
obj->path);
|
|
|
|
|
return -1;
|
|
|
|
|
}
|
|
|
|
|
|
1999-01-12 02:12:16 +03:00
|
|
|
|
dbg(" relocating %s (%ld/%ld rel/rela, %ld/%ld plt rel/rela)",
|
1996-12-16 23:37:55 +03:00
|
|
|
|
obj->path,
|
1999-01-12 02:12:16 +03:00
|
|
|
|
(long)(obj->rellim - obj->rel), (long)(obj->relalim - obj->rela),
|
|
|
|
|
(long)(obj->pltrellim - obj->pltrel),
|
|
|
|
|
(long)(obj->pltrelalim - obj->pltrela));
|
1996-12-16 23:37:55 +03:00
|
|
|
|
|
|
|
|
|
if (obj->textrel) {
|
|
|
|
|
/* There are relocations to the write-protected text segment. */
|
|
|
|
|
if (mprotect(obj->mapbase, obj->textsize,
|
|
|
|
|
PROT_READ|PROT_WRITE|PROT_EXEC) == -1) {
|
|
|
|
|
_rtld_error("%s: Cannot write-enable text segment: %s",
|
|
|
|
|
obj->path, xstrerror(errno));
|
|
|
|
|
return -1;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (obj->rel != NULL) {
|
|
|
|
|
/* Process the non-PLT relocations. */
|
|
|
|
|
const Elf_Rel *rel;
|
|
|
|
|
for (rel = obj->rel; rel < obj->rellim; ++rel) {
|
|
|
|
|
Elf_RelA ourrela;
|
|
|
|
|
ourrela.r_info = rel->r_info;
|
|
|
|
|
ourrela.r_offset = rel->r_offset;
|
1998-03-25 07:12:32 +03:00
|
|
|
|
#if defined(__mips__)
|
|
|
|
|
/* rel->r_offset is not valid on mips? */
|
|
|
|
|
if (ELF_R_TYPE(ourrela.r_info) == R_TYPE(NONE))
|
|
|
|
|
ourrela.r_addend = 0;
|
|
|
|
|
else
|
|
|
|
|
#endif
|
1996-12-16 23:37:55 +03:00
|
|
|
|
ourrela.r_addend = *(Elf_Word *) (obj->relocbase + rel->r_offset);
|
|
|
|
|
|
|
|
|
|
if (_rtld_relocate_nonplt_object(obj, &ourrela) < 0)
|
|
|
|
|
ok = 0;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (obj->rela != NULL) {
|
|
|
|
|
/* Process the non-PLT relocations. */
|
|
|
|
|
const Elf_RelA *rela;
|
|
|
|
|
for (rela = obj->rela; rela < obj->relalim; ++rela) {
|
|
|
|
|
if (_rtld_relocate_nonplt_object(obj, rela) < 0)
|
|
|
|
|
ok = 0;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (obj->textrel) { /* Re-protected the text segment. */
|
|
|
|
|
if (mprotect(obj->mapbase, obj->textsize,
|
|
|
|
|
PROT_READ|PROT_EXEC) == -1) {
|
|
|
|
|
_rtld_error("%s: Cannot write-protect text segment: %s",
|
|
|
|
|
obj->path, xstrerror(errno));
|
|
|
|
|
return -1;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Process the PLT relocations. */
|
|
|
|
|
if (obj->pltrel != NULL) {
|
|
|
|
|
const Elf_Rel *rel;
|
|
|
|
|
for (rel = obj->pltrel; rel < obj->pltrellim; ++rel) {
|
|
|
|
|
Elf_RelA ourrela;
|
|
|
|
|
ourrela.r_info = rel->r_info;
|
|
|
|
|
ourrela.r_offset = rel->r_offset;
|
|
|
|
|
ourrela.r_addend = *(Elf_Word *) (obj->relocbase + rel->r_offset);
|
|
|
|
|
if (_rtld_relocate_plt_object(obj, &ourrela, bind_now) < 0)
|
|
|
|
|
ok = 0;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (obj->pltrela != NULL) {
|
|
|
|
|
const Elf_RelA *rela;
|
|
|
|
|
for (rela = obj->pltrela; rela < obj->pltrelalim; ++rela) {
|
|
|
|
|
if (_rtld_relocate_plt_object(obj, rela, bind_now) < 0)
|
|
|
|
|
ok = 0;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (!ok)
|
|
|
|
|
return -1;
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/* Set some sanity-checking numbers in the Obj_Entry. */
|
|
|
|
|
obj->magic = RTLD_MAGIC;
|
|
|
|
|
obj->version = RTLD_VERSION;
|
|
|
|
|
|
|
|
|
|
/* Fill in the dynamic linker entry points. */
|
|
|
|
|
obj->dlopen = _rtld_dlopen;
|
|
|
|
|
obj->dlsym = _rtld_dlsym;
|
|
|
|
|
obj->dlerror = _rtld_dlerror;
|
|
|
|
|
obj->dlclose = _rtld_dlclose;
|
|
|
|
|
|
|
|
|
|
/* Set the special PLTGOT entries. */
|
|
|
|
|
if (obj->pltgot != NULL) {
|
|
|
|
|
#if defined(__i386__)
|
|
|
|
|
obj->pltgot[1] = (Elf_Addr) obj;
|
|
|
|
|
obj->pltgot[2] = (Elf_Addr) &_rtld_bind_start;
|
|
|
|
|
#endif
|
|
|
|
|
#if defined(__alpha__)
|
|
|
|
|
/* This function will be called to perform the relocation. */
|
|
|
|
|
obj->pltgot[2] = (Elf_Addr) &_rtld_bind_start;
|
|
|
|
|
/* Identify this shared object */
|
|
|
|
|
obj->pltgot[3] = (Elf_Addr) obj;
|
1998-03-25 07:12:32 +03:00
|
|
|
|
#endif
|
|
|
|
|
#if defined(__mips__)
|
|
|
|
|
_rtld_relocate_mips_got(obj);
|
|
|
|
|
|
|
|
|
|
obj->pltgot[0] = (Elf_Addr) &_rtld_bind_start;
|
|
|
|
|
/* XXX only if obj->pltgot[1] & 0x80000000 ?? */
|
|
|
|
|
obj->pltgot[1] |= (Elf_Addr) obj;
|
1998-11-24 14:34:30 +03:00
|
|
|
|
#endif
|
|
|
|
|
#if defined(__powerpc__)
|
|
|
|
|
_rtld_setup_powerpc_plt(obj);
|
1996-12-16 23:37:55 +03:00
|
|
|
|
#endif
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
}
|