e83f7ba2c9
. file- and functionality-compatible with previous situation
(FreeBSD csu) (with a crt1.o -> crt0.o symlink in /usr/lib)
. harmonizes source with netbsd
. harmonizes linker invocation (e.g. clang) with netbsd
. helpful to get some arm code in there for the arm port project
311 lines
9.7 KiB
C
311 lines
9.7 KiB
C
/* $NetBSD: mdreloc.c,v 1.38 2010/08/06 16:33:19 joerg Exp $ */
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/*
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* Copyright (c) 2001 Wasabi Systems, Inc.
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* All rights reserved.
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*
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* Written by Frank van der Linden for Wasabi Systems, Inc.
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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 for the NetBSD Project by
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* Wasabi Systems, Inc.
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* 4. The name of Wasabi Systems, Inc. may not be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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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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#include <sys/cdefs.h>
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#ifndef lint
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__RCSID("$NetBSD: mdreloc.c,v 1.38 2010/08/06 16:33:19 joerg Exp $");
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#endif /* not lint */
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#include <sys/types.h>
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#include <sys/mman.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 <elf.h>
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#include "debug.h"
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#include "rtld.h"
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void _rtld_bind_start(void);
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void _rtld_relocate_nonplt_self(Elf_Dyn *, Elf_Addr);
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caddr_t _rtld_bind(const Obj_Entry *, Elf_Word);
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static inline int _rtld_relocate_plt_object(const Obj_Entry *,
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const Elf_Rela *, Elf_Addr *);
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void
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_rtld_setup_pltgot(const Obj_Entry *obj)
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{
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obj->pltgot[1] = (Elf_Addr) obj;
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obj->pltgot[2] = (Elf_Addr) &_rtld_bind_start;
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}
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void
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_rtld_relocate_nonplt_self(Elf_Dyn *dynp, Elf_Addr relocbase)
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{
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const Elf_Rela *rela = 0, *relalim;
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Elf_Addr relasz = 0;
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Elf_Addr *where;
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for (; dynp->d_tag != DT_NULL; dynp++) {
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switch (dynp->d_tag) {
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case DT_RELA:
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rela = (const Elf_Rela *)(relocbase + dynp->d_un.d_ptr);
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break;
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case DT_RELASZ:
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relasz = dynp->d_un.d_val;
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break;
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}
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}
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/*
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* Assume only 64-bit relocations here, which should always
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* be true for the dynamic linker.
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*/
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relalim = (const Elf_Rela *)((const uint8_t *)rela + relasz);
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for (; rela < relalim; rela++) {
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where = (Elf_Addr *)(relocbase + rela->r_offset);
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*where = (Elf_Addr)(relocbase + rela->r_addend);
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}
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}
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int
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_rtld_relocate_nonplt_objects(Obj_Entry *obj)
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{
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const Elf_Rela *rela;
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const Elf_Sym *def = NULL;
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const Obj_Entry *defobj =NULL;
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for (rela = obj->rela; rela < obj->relalim; rela++) {
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Elf64_Addr *where64;
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Elf32_Addr *where32;
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Elf64_Addr tmp64;
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Elf32_Addr tmp32;
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unsigned long symnum;
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where64 = (Elf64_Addr *)(obj->relocbase + rela->r_offset);
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where32 = (Elf32_Addr *)where64;
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symnum = ELF_R_SYM(rela->r_info);
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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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case R_TYPE(32): /* word32 S + A, truncate */
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case R_TYPE(32S): /* word32 S + A, signed truncate */
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case R_TYPE(GOT32): /* word32 G + A (XXX can we see these?) */
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def = _rtld_find_symdef(symnum, obj, &defobj, false);
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if (def == NULL)
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return -1;
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tmp32 = (Elf32_Addr)(u_long)(defobj->relocbase +
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def->st_value + rela->r_addend);
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if (*where32 != tmp32)
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*where32 = tmp32;
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rdbg(("32/32S %s in %s --> %p in %s",
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obj->strtab + obj->symtab[symnum].st_name,
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obj->path, (void *)(unsigned long)*where32,
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defobj->path));
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break;
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case R_TYPE(64): /* word64 S + A */
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def = _rtld_find_symdef(symnum, obj, &defobj, false);
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if (def == NULL)
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return -1;
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tmp64 = (Elf64_Addr)(defobj->relocbase + def->st_value +
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rela->r_addend);
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if (*where64 != tmp64)
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*where64 = tmp64;
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rdbg(("64 %s in %s --> %p in %s",
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obj->strtab + obj->symtab[symnum].st_name,
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obj->path, (void *)*where64, defobj->path));
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break;
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case R_TYPE(PC32): /* word32 S + A - P */
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def = _rtld_find_symdef(symnum, obj, &defobj, false);
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if (def == NULL)
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return -1;
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tmp32 = (Elf32_Addr)(u_long)(defobj->relocbase +
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def->st_value + rela->r_addend -
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(Elf64_Addr)where64);
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if (*where32 != tmp32)
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*where32 = tmp32;
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rdbg(("PC32 %s in %s --> %p in %s",
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obj->strtab + obj->symtab[symnum].st_name,
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obj->path, (void *)(unsigned long)*where32,
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defobj->path));
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break;
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case R_TYPE(GLOB_DAT): /* word64 S */
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def = _rtld_find_symdef(symnum, obj, &defobj, false);
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if (def == NULL)
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return -1;
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tmp64 = (Elf64_Addr)(defobj->relocbase + def->st_value);
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if (*where64 != tmp64)
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*where64 = tmp64;
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rdbg(("64 %s in %s --> %p in %s",
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obj->strtab + obj->symtab[symnum].st_name,
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obj->path, (void *)*where64, defobj->path));
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break;
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case R_TYPE(RELATIVE): /* word64 B + A */
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tmp64 = (Elf64_Addr)(obj->relocbase + rela->r_addend);
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if (*where64 != tmp64)
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*where64 = tmp64;
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rdbg(("RELATIVE in %s --> %p", obj->path,
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(void *)*where64));
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break;
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case R_TYPE(COPY):
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rdbg(("COPY"));
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break;
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default:
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rdbg(("sym = %lu, type = %lu, offset = %p, "
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"addend = %p, contents = %p, symbol = %s",
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symnum, (u_long)ELF_R_TYPE(rela->r_info),
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(void *)rela->r_offset, (void *)rela->r_addend,
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(void *)*where64,
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obj->strtab + obj->symtab[symnum].st_name));
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_rtld_error("%s: Unsupported relocation type %ld "
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"in non-PLT relocations",
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obj->path, (u_long) ELF_R_TYPE(rela->r_info));
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return -1;
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}
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}
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return 0;
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}
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int
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_rtld_relocate_plt_lazy(const Obj_Entry *obj)
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{
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const Elf_Rela *rela;
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if (!obj->relocbase)
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return 0;
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for (rela = obj->pltrela; rela < obj->pltrelalim; rela++) {
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Elf_Addr *where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
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assert(ELF_R_TYPE(rela->r_info) == R_TYPE(JUMP_SLOT));
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/* Just relocate the GOT slots pointing into the PLT */
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*where += (Elf_Addr)obj->relocbase;
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rdbg(("fixup !main in %s --> %p", obj->path, (void *)*where));
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}
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return 0;
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}
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static inline int
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_rtld_relocate_plt_object(const Obj_Entry *obj, const Elf_Rela *rela, Elf_Addr *tp)
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{
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Elf_Addr *where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
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Elf_Addr new_value;
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const Elf_Sym *def;
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const Obj_Entry *defobj;
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unsigned long info = rela->r_info;
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assert(ELF_R_TYPE(info) == R_TYPE(JUMP_SLOT));
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def = _rtld_find_plt_symdef(ELF_R_SYM(info), obj, &defobj, tp != NULL);
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if (__predict_false(def == NULL))
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return -1;
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if (__predict_false(def == &_rtld_sym_zero))
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return 0;
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new_value = (Elf_Addr)(defobj->relocbase + def->st_value +
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rela->r_addend);
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rdbg(("bind now/fixup in %s --> old=%p new=%p",
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defobj->strtab + def->st_name, (void *)*where, (void *)new_value));
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if (*where != new_value)
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*where = new_value;
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if (tp)
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*tp = new_value - rela->r_addend;
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return 0;
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}
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caddr_t
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_rtld_bind(const Obj_Entry *obj, Elf_Word reloff)
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{
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const Elf_Rela *rela = obj->pltrela + reloff;
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Elf_Addr new_value;
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int error;
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new_value = 0; /* XXX GCC4 */
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error = _rtld_relocate_plt_object(obj, rela, &new_value);
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if (error)
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_rtld_die();
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return (caddr_t)new_value;
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}
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int
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_rtld_relocate_plt_objects(const Obj_Entry *obj)
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{
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const Elf_Rela *rela;
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for (rela = obj->pltrela; rela < obj->pltrelalim; rela++)
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if (_rtld_relocate_plt_object(obj, rela, NULL) < 0)
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return -1;
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return 0;
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}
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