2002-12-04 07:32:20 +00:00
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/* $NetBSD: ppc_reloc.c,v 1.10 2001/09/10 06:09:41 mycroft Exp $ */
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/*-
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2017-11-27 15:25:02 +00:00
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* SPDX-License-Identifier: BSD-2-Clause-NetBSD
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*
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2002-12-04 07:32:20 +00:00
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* Copyright (C) 1998 Tsubai Masanari
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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. 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
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/mman.h>
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#include <errno.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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2013-07-28 18:44:17 +00:00
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#include <machine/cpu.h>
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2012-04-23 00:54:06 +00:00
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#include <machine/atomic.h>
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2007-11-19 08:58:11 +00:00
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#include <machine/md_var.h>
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2002-12-04 07:32:20 +00:00
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#include "debug.h"
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#include "rtld.h"
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#define _ppc_ha(x) ((((u_int32_t)(x) & 0x8000) ? \
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((u_int32_t)(x) + 0x10000) : (u_int32_t)(x)) >> 16)
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#define _ppc_la(x) ((u_int32_t)(x) & 0xffff)
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2010-02-22 16:49:45 +00:00
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#define min(a,b) (((a) < (b)) ? (a) : (b))
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#define max(a,b) (((a) > (b)) ? (a) : (b))
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#define PLT_EXTENDED_BEGIN (1 << 13)
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#define JMPTAB_BASE(N) (18 + N*2 + ((N > PLT_EXTENDED_BEGIN) ? \
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(N - PLT_EXTENDED_BEGIN)*2 : 0))
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2019-06-25 00:40:44 +00:00
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void _rtld_bind_secureplt_start(void);
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2002-12-04 07:32:20 +00:00
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/*
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* Process the R_PPC_COPY relocations
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*/
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int
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do_copy_relocations(Obj_Entry *dstobj)
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{
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const Elf_Rela *relalim;
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const Elf_Rela *rela;
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2003-05-29 22:58:26 +00:00
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/*
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2002-12-04 07:32:20 +00:00
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* COPY relocs are invalid outside of the main program
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*/
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2003-05-29 22:58:26 +00:00
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assert(dstobj->mainprog);
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2002-12-04 07:32:20 +00:00
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2018-10-29 21:08:19 +00:00
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relalim = (const Elf_Rela *)((const char *) dstobj->rela +
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2002-12-04 07:32:20 +00:00
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dstobj->relasize);
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for (rela = dstobj->rela; rela < relalim; rela++) {
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void *dstaddr;
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const Elf_Sym *dstsym;
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const char *name;
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size_t size;
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const void *srcaddr;
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const Elf_Sym *srcsym = NULL;
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2010-12-25 08:51:20 +00:00
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const Obj_Entry *srcobj, *defobj;
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SymLook req;
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int res;
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2002-12-04 07:32:20 +00:00
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if (ELF_R_TYPE(rela->r_info) != R_PPC_COPY) {
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continue;
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}
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2018-10-29 21:08:19 +00:00
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dstaddr = (void *)(dstobj->relocbase + rela->r_offset);
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2002-12-04 07:32:20 +00:00
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dstsym = dstobj->symtab + ELF_R_SYM(rela->r_info);
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name = dstobj->strtab + dstsym->st_name;
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size = dstsym->st_size;
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2010-12-25 08:51:20 +00:00
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symlook_init(&req, name);
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req.ventry = fetch_ventry(dstobj, ELF_R_SYM(rela->r_info));
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2012-03-20 13:20:49 +00:00
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req.flags = SYMLOOK_EARLY;
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2003-05-29 22:58:26 +00:00
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2016-01-20 07:21:33 +00:00
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for (srcobj = globallist_next(dstobj); srcobj != NULL;
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srcobj = globallist_next(srcobj)) {
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2010-12-25 08:51:20 +00:00
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res = symlook_obj(&req, srcobj);
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if (res == 0) {
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srcsym = req.sym_out;
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defobj = req.defobj_out;
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2002-12-04 07:32:20 +00:00
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break;
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}
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}
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if (srcobj == NULL) {
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_rtld_error("Undefined symbol \"%s\" "
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" 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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2003-05-29 22:58:26 +00:00
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2018-10-29 21:08:19 +00:00
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srcaddr = (const void *)(defobj->relocbase+srcsym->st_value);
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2003-05-29 22:58:26 +00:00
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memcpy(dstaddr, srcaddr, size);
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2002-12-04 07:32:20 +00:00
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dbg("copy_reloc: src=%p,dst=%p,size=%d\n",srcaddr,dstaddr,size);
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}
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2003-05-29 22:58:26 +00:00
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2002-12-04 07:32:20 +00:00
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return (0);
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}
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/*
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* Perform early relocation of the run-time linker image
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*/
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void
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reloc_non_plt_self(Elf_Dyn *dynp, Elf_Addr relocbase)
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{
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2016-04-19 19:03:55 +00:00
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const Elf_Rela *rela = NULL, *relalim;
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2002-12-04 07:32:20 +00:00
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Elf_Addr relasz = 0;
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Elf_Addr *where;
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/*
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* Extract the rela/relasz values from the dynamic section
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*/
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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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2003-05-29 22:58:26 +00:00
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* Relocate these values
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2002-12-04 07:32:20 +00:00
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*/
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2018-10-29 21:08:19 +00:00
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relalim = (const Elf_Rela *)((const char *)rela + relasz);
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2002-12-04 07:32:20 +00:00
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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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/*
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2003-05-29 22:58:26 +00:00
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* Relocate a non-PLT object with addend.
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2002-12-04 07:32:20 +00:00
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*/
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static int
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2018-10-29 21:08:19 +00:00
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reloc_nonplt_object(Obj_Entry *obj_rtld __unused, Obj_Entry *obj,
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const Elf_Rela *rela, SymCache *cache, int flags, RtldLockState *lockstate)
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2002-12-04 07:32:20 +00:00
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{
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2019-12-24 16:13:15 +00:00
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const Elf_Sym *def = NULL;
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const Obj_Entry *defobj;
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Elf_Addr *where, symval = 0;
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2002-12-04 07:32:20 +00:00
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2019-12-24 16:13:15 +00:00
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/*
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* First, resolve symbol for relocations which
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* reference symbols.
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*/
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2002-12-04 07:32:20 +00:00
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switch (ELF_R_TYPE(rela->r_info)) {
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2003-05-29 22:58:26 +00:00
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2019-12-24 16:13:15 +00:00
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case R_PPC_UADDR32: /* word32 S + A */
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case R_PPC_ADDR32:
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case R_PPC_GLOB_DAT: /* word32 S + A */
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case R_PPC_DTPMOD32:
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case R_PPC_TPREL32:
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case R_PPC_DTPREL32:
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2002-12-04 07:32:20 +00:00
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def = find_symdef(ELF_R_SYM(rela->r_info), obj, &defobj,
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2012-03-20 13:20:49 +00:00
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flags, cache, lockstate);
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2002-12-04 07:32:20 +00:00
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if (def == NULL) {
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return (-1);
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}
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/*
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2019-12-24 16:13:15 +00:00
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* If symbol is IFUNC, only perform relocation
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* when caller allowed it by passing
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* SYMLOOK_IFUNC flag. Skip the relocations
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* otherwise.
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*
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* Also error out in case IFUNC relocations
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* are specified for TLS, which cannot be
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* usefully interpreted.
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2002-12-04 07:32:20 +00:00
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*/
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2019-12-24 16:13:15 +00:00
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if (ELF_ST_TYPE(def->st_info) == STT_GNU_IFUNC) {
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switch (ELF_R_TYPE(rela->r_info)) {
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case R_PPC_UADDR32:
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case R_PPC_ADDR32:
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case R_PPC_GLOB_DAT:
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if ((flags & SYMLOOK_IFUNC) == 0) {
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dbg("Non-PLT reference to IFUNC found!");
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obj->non_plt_gnu_ifunc = true;
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return (0);
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}
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symval = (Elf_Addr)rtld_resolve_ifunc(
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defobj, def);
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break;
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default:
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_rtld_error("%s: IFUNC for TLS reloc",
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obj->path);
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return (-1);
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}
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} else {
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if ((flags & SYMLOOK_IFUNC) != 0)
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return (0);
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symval = (Elf_Addr)defobj->relocbase +
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def->st_value;
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2003-05-29 22:58:26 +00:00
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}
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2002-12-04 07:32:20 +00:00
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break;
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2019-12-24 16:13:15 +00:00
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default:
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if ((flags & SYMLOOK_IFUNC) != 0)
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return (0);
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}
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where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
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2002-12-04 07:32:20 +00:00
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2019-12-24 16:13:15 +00:00
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switch (ELF_R_TYPE(rela->r_info)) {
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case R_PPC_NONE:
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break;
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case R_PPC_UADDR32:
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case R_PPC_ADDR32:
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case R_PPC_GLOB_DAT:
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/* Don't issue write if unnecessary; avoid COW page fault */
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if (*where != symval + rela->r_addend) {
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*where = symval + rela->r_addend;
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}
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2002-12-04 07:32:20 +00:00
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break;
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2004-11-02 09:47:01 +00:00
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case R_PPC_DTPMOD32:
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*where = (Elf_Addr) defobj->tlsindex;
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break;
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case R_PPC_TPREL32:
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/*
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* We lazily allocate offsets for static TLS as we
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* see the first relocation that references the
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* TLS block. This allows us to support (small
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* amounts of) static TLS in dynamically loaded
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* modules. If we run out of space, we generate an
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* error.
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*/
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if (!defobj->tls_done) {
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2018-10-29 21:08:19 +00:00
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if (!allocate_tls_offset(
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__DECONST(Obj_Entry *, defobj))) {
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2004-11-02 09:47:01 +00:00
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_rtld_error("%s: No space available for static "
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"Thread Local Storage", obj->path);
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return (-1);
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}
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}
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*(Elf_Addr **)where = *where * sizeof(Elf_Addr)
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+ (Elf_Addr *)(def->st_value + rela->r_addend
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2018-10-01 18:46:35 +00:00
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+ defobj->tlsoffset - TLS_TP_OFFSET - TLS_TCB_SIZE);
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2004-11-02 09:47:01 +00:00
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break;
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case R_PPC_DTPREL32:
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*where += (Elf_Addr)(def->st_value + rela->r_addend
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- TLS_DTV_OFFSET);
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2019-12-24 16:13:15 +00:00
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break;
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case R_PPC_RELATIVE: /* word32 B + A */
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symval = (Elf_Addr)(obj->relocbase + rela->r_addend);
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2004-11-02 09:47:01 +00:00
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2019-12-24 16:13:15 +00:00
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/* As above, don't issue write unnecessarily */
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if (*where != symval) {
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*where = symval;
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}
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2004-11-02 09:47:01 +00:00
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break;
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2019-12-24 16:13:15 +00:00
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case R_PPC_COPY:
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/*
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* These are deferred until all other relocations
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* have been done. All we do here is make sure
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* that the COPY relocation is not in a shared
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* library. They are allowed only in executable
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* files.
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*/
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if (!obj->mainprog) {
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_rtld_error("%s: Unexpected R_COPY "
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" relocation in shared library",
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obj->path);
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return (-1);
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}
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break;
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case R_PPC_IRELATIVE:
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/*
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* These will be handled by reloc_iresolve().
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*/
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obj->irelative = true;
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break;
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case R_PPC_JMP_SLOT:
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/*
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* These will be handled by the plt/jmpslot routines
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*/
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break;
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|
2002-12-04 07:32:20 +00:00
|
|
|
default:
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_rtld_error("%s: Unsupported relocation type %d"
|
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|
|
" in non-PLT relocations\n", obj->path,
|
2003-05-29 22:58:26 +00:00
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|
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ELF_R_TYPE(rela->r_info));
|
2002-12-04 07:32:20 +00:00
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return (-1);
|
2019-12-24 16:13:15 +00:00
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}
|
2003-05-29 22:58:26 +00:00
|
|
|
return (0);
|
2002-12-04 07:32:20 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Process non-PLT relocations
|
|
|
|
*/
|
|
|
|
int
|
2012-03-20 13:20:49 +00:00
|
|
|
reloc_non_plt(Obj_Entry *obj, Obj_Entry *obj_rtld, int flags,
|
|
|
|
RtldLockState *lockstate)
|
2002-12-04 07:32:20 +00:00
|
|
|
{
|
|
|
|
const Elf_Rela *relalim;
|
|
|
|
const Elf_Rela *rela;
|
2018-11-03 20:39:16 +00:00
|
|
|
const Elf_Phdr *phdr;
|
2002-12-04 07:32:20 +00:00
|
|
|
SymCache *cache;
|
|
|
|
int r = -1;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* The dynamic loader may be called from a thread, we have
|
|
|
|
* limited amounts of stack available so we cannot use alloca().
|
|
|
|
*/
|
2007-07-15 22:52:15 +00:00
|
|
|
if (obj != obj_rtld) {
|
2012-04-30 13:31:10 +00:00
|
|
|
cache = calloc(obj->dynsymcount, sizeof(SymCache));
|
2010-05-18 08:55:23 +00:00
|
|
|
/* No need to check for NULL here */
|
2007-07-15 22:52:15 +00:00
|
|
|
} else
|
2002-12-04 07:32:20 +00:00
|
|
|
cache = NULL;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* From the SVR4 PPC ABI:
|
2003-05-29 22:58:26 +00:00
|
|
|
* "The PowerPC family uses only the Elf32_Rela relocation
|
2002-12-04 07:32:20 +00:00
|
|
|
* entries with explicit addends."
|
|
|
|
*/
|
2018-10-29 21:08:19 +00:00
|
|
|
relalim = (const Elf_Rela *)((const char *)obj->rela + obj->relasize);
|
2002-12-04 07:32:20 +00:00
|
|
|
for (rela = obj->rela; rela < relalim; rela++) {
|
2012-03-20 13:20:49 +00:00
|
|
|
if (reloc_nonplt_object(obj_rtld, obj, rela, cache, flags,
|
|
|
|
lockstate) < 0)
|
2002-12-04 07:32:20 +00:00
|
|
|
goto done;
|
|
|
|
}
|
|
|
|
r = 0;
|
|
|
|
done:
|
2010-05-18 08:55:23 +00:00
|
|
|
if (cache != NULL)
|
|
|
|
free(cache);
|
2011-12-17 16:20:27 +00:00
|
|
|
|
2018-11-03 20:39:16 +00:00
|
|
|
/*
|
|
|
|
* Synchronize icache for executable segments in case we made
|
|
|
|
* any changes.
|
|
|
|
*/
|
|
|
|
for (phdr = obj->phdr;
|
|
|
|
(const char *)phdr < (const char *)obj->phdr + obj->phsize;
|
|
|
|
phdr++) {
|
|
|
|
if (phdr->p_type == PT_LOAD && (phdr->p_flags & PF_X) != 0) {
|
|
|
|
__syncicache(obj->relocbase + phdr->p_vaddr,
|
|
|
|
phdr->p_memsz);
|
|
|
|
}
|
|
|
|
}
|
2011-12-17 16:20:27 +00:00
|
|
|
|
2002-12-04 07:32:20 +00:00
|
|
|
return (r);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Initialise a PLT slot to the resolving trampoline
|
|
|
|
*/
|
|
|
|
static int
|
|
|
|
reloc_plt_object(Obj_Entry *obj, const Elf_Rela *rela)
|
|
|
|
{
|
|
|
|
Elf_Word *where = (Elf_Word *)(obj->relocbase + rela->r_offset);
|
2010-02-22 16:49:45 +00:00
|
|
|
Elf_Addr *pltresolve, *pltlongresolve, *jmptab;
|
2002-12-04 07:32:20 +00:00
|
|
|
Elf_Addr distance;
|
2010-02-22 16:49:45 +00:00
|
|
|
int N = obj->pltrelasize / sizeof(Elf_Rela);
|
2002-12-04 07:32:20 +00:00
|
|
|
int reloff;
|
|
|
|
|
|
|
|
reloff = rela - obj->pltrela;
|
|
|
|
|
2010-02-22 16:49:45 +00:00
|
|
|
if (reloff < 0)
|
2002-12-04 07:32:20 +00:00
|
|
|
return (-1);
|
|
|
|
|
2019-06-25 00:40:44 +00:00
|
|
|
if (obj->gotptr != NULL) {
|
|
|
|
*where += (Elf_Addr)obj->relocbase;
|
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
|
2010-02-22 16:49:45 +00:00
|
|
|
pltlongresolve = obj->pltgot + 5;
|
|
|
|
pltresolve = pltlongresolve + 5;
|
2002-12-04 07:32:20 +00:00
|
|
|
|
|
|
|
distance = (Elf_Addr)pltresolve - (Elf_Addr)(where + 1);
|
|
|
|
|
2003-05-29 22:58:26 +00:00
|
|
|
dbg(" reloc_plt_object: where=%p,pltres=%p,reloff=%x,distance=%x",
|
2002-12-04 07:32:20 +00:00
|
|
|
(void *)where, (void *)pltresolve, reloff, distance);
|
|
|
|
|
2010-02-22 16:49:45 +00:00
|
|
|
if (reloff < PLT_EXTENDED_BEGIN) {
|
|
|
|
/* li r11,reloff */
|
|
|
|
/* b pltresolve */
|
|
|
|
where[0] = 0x39600000 | reloff;
|
|
|
|
where[1] = 0x48000000 | (distance & 0x03fffffc);
|
|
|
|
} else {
|
|
|
|
jmptab = obj->pltgot + JMPTAB_BASE(N);
|
|
|
|
jmptab[reloff] = (u_int)pltlongresolve;
|
|
|
|
|
|
|
|
/* lis r11,jmptab[reloff]@ha */
|
|
|
|
/* lwzu r12,jmptab[reloff]@l(r11) */
|
|
|
|
/* mtctr r12 */
|
|
|
|
/* bctr */
|
|
|
|
where[0] = 0x3d600000 | _ppc_ha(&jmptab[reloff]);
|
|
|
|
where[1] = 0x858b0000 | _ppc_la(&jmptab[reloff]);
|
|
|
|
where[2] = 0x7d8903a6;
|
|
|
|
where[3] = 0x4e800420;
|
|
|
|
}
|
|
|
|
|
2002-12-04 07:32:20 +00:00
|
|
|
|
|
|
|
/*
|
2011-12-17 15:31:00 +00:00
|
|
|
* The icache will be sync'd in reloc_plt, which is called
|
2002-12-04 07:32:20 +00:00
|
|
|
* after all the slots have been updated
|
|
|
|
*/
|
|
|
|
|
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Process the PLT relocations.
|
|
|
|
*/
|
|
|
|
int
|
2018-12-15 10:38:07 +00:00
|
|
|
reloc_plt(Obj_Entry *obj, int flags __unused, RtldLockState *lockstate __unused)
|
2002-12-04 07:32:20 +00:00
|
|
|
{
|
|
|
|
const Elf_Rela *relalim;
|
|
|
|
const Elf_Rela *rela;
|
2011-12-17 15:31:00 +00:00
|
|
|
int N = obj->pltrelasize / sizeof(Elf_Rela);
|
2002-12-04 07:32:20 +00:00
|
|
|
|
|
|
|
if (obj->pltrelasize != 0) {
|
|
|
|
|
2018-10-29 21:08:19 +00:00
|
|
|
relalim = (const Elf_Rela *)((const char *)obj->pltrela +
|
2002-12-04 07:32:20 +00:00
|
|
|
obj->pltrelasize);
|
|
|
|
for (rela = obj->pltrela; rela < relalim; rela++) {
|
2019-12-24 16:13:15 +00:00
|
|
|
if (ELF_R_TYPE(rela->r_info) == R_PPC_IRELATIVE) {
|
|
|
|
dbg("ABI violation - found IRELATIVE in the PLT.");
|
|
|
|
obj->irelative = true;
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* PowerPC(64) .rela.plt is composed of an array of
|
|
|
|
* R_PPC_JMP_SLOT relocations. Unlike other platforms,
|
|
|
|
* this is the ONLY relocation type that is valid here.
|
|
|
|
*/
|
2002-12-04 07:32:20 +00:00
|
|
|
assert(ELF_R_TYPE(rela->r_info) == R_PPC_JMP_SLOT);
|
|
|
|
|
|
|
|
if (reloc_plt_object(obj, rela) < 0) {
|
|
|
|
return (-1);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2011-12-17 15:31:00 +00:00
|
|
|
/*
|
|
|
|
* Sync the icache for the byte range represented by the
|
|
|
|
* trampoline routines and call slots.
|
|
|
|
*/
|
2019-06-25 00:40:44 +00:00
|
|
|
if (obj->pltgot != NULL && obj->gotptr == NULL)
|
2011-12-17 15:31:00 +00:00
|
|
|
__syncicache(obj->pltgot, JMPTAB_BASE(N)*4);
|
|
|
|
|
2002-12-04 07:32:20 +00:00
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* LD_BIND_NOW was set - force relocation for all jump slots
|
|
|
|
*/
|
|
|
|
int
|
2012-03-20 13:20:49 +00:00
|
|
|
reloc_jmpslots(Obj_Entry *obj, int flags, RtldLockState *lockstate)
|
2002-12-04 07:32:20 +00:00
|
|
|
{
|
|
|
|
const Obj_Entry *defobj;
|
|
|
|
const Elf_Rela *relalim;
|
|
|
|
const Elf_Rela *rela;
|
|
|
|
const Elf_Sym *def;
|
|
|
|
Elf_Addr *where;
|
|
|
|
Elf_Addr target;
|
|
|
|
|
2018-10-29 21:08:19 +00:00
|
|
|
relalim = (const Elf_Rela *)((const char *)obj->pltrela +
|
|
|
|
obj->pltrelasize);
|
2002-12-04 07:32:20 +00:00
|
|
|
for (rela = obj->pltrela; rela < relalim; rela++) {
|
2019-12-24 16:13:15 +00:00
|
|
|
/* This isn't actually a jump slot, ignore it. */
|
|
|
|
if (ELF_R_TYPE(rela->r_info) == R_PPC_IRELATIVE)
|
|
|
|
continue;
|
2002-12-04 07:32:20 +00:00
|
|
|
assert(ELF_R_TYPE(rela->r_info) == R_PPC_JMP_SLOT);
|
|
|
|
where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
|
|
|
|
def = find_symdef(ELF_R_SYM(rela->r_info), obj, &defobj,
|
2012-03-20 13:20:49 +00:00
|
|
|
SYMLOOK_IN_PLT | flags, NULL, lockstate);
|
2002-12-04 07:32:20 +00:00
|
|
|
if (def == NULL) {
|
|
|
|
dbg("reloc_jmpslots: sym not found");
|
|
|
|
return (-1);
|
|
|
|
}
|
|
|
|
|
|
|
|
target = (Elf_Addr)(defobj->relocbase + def->st_value);
|
|
|
|
|
2019-12-24 16:13:15 +00:00
|
|
|
if (def == &sym_zero) {
|
|
|
|
/* Zero undefined weak symbols */
|
|
|
|
*where = 0;
|
|
|
|
} else {
|
|
|
|
if (ELF_ST_TYPE(def->st_info) == STT_GNU_IFUNC) {
|
|
|
|
/* LD_BIND_NOW, ifunc in shared lib.*/
|
|
|
|
obj->gnu_ifunc = true;
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
reloc_jmpslot(where, target, defobj, obj,
|
|
|
|
(const Elf_Rel *) rela);
|
|
|
|
}
|
2002-12-04 07:32:20 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
obj->jmpslots_done = true;
|
|
|
|
|
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
2019-12-24 16:13:15 +00:00
|
|
|
* Update the value of a PLT jump slot.
|
2002-12-04 07:32:20 +00:00
|
|
|
*/
|
|
|
|
Elf_Addr
|
2018-10-29 21:08:19 +00:00
|
|
|
reloc_jmpslot(Elf_Addr *wherep, Elf_Addr target,
|
|
|
|
const Obj_Entry *defobj __unused, const Obj_Entry *obj, const Elf_Rel *rel)
|
2002-12-04 07:32:20 +00:00
|
|
|
{
|
|
|
|
Elf_Addr offset;
|
|
|
|
const Elf_Rela *rela = (const Elf_Rela *) rel;
|
|
|
|
|
2003-05-29 22:58:26 +00:00
|
|
|
dbg(" reloc_jmpslot: where=%p, target=%p",
|
2002-12-04 07:32:20 +00:00
|
|
|
(void *)wherep, (void *)target);
|
|
|
|
|
2017-03-15 21:11:57 +00:00
|
|
|
if (ld_bind_not)
|
|
|
|
goto out;
|
|
|
|
|
2019-12-24 16:13:15 +00:00
|
|
|
|
2002-12-04 07:32:20 +00:00
|
|
|
/*
|
2019-12-24 16:13:15 +00:00
|
|
|
* Process Secure-PLT.
|
2002-12-04 07:32:20 +00:00
|
|
|
*/
|
2019-06-25 00:40:44 +00:00
|
|
|
if (obj->gotptr != NULL) {
|
|
|
|
assert(wherep >= (Elf_Word *)obj->pltgot);
|
|
|
|
assert(wherep <
|
|
|
|
(Elf_Word *)obj->pltgot + obj->pltrelasize);
|
2019-12-24 16:13:15 +00:00
|
|
|
if (*wherep != target)
|
|
|
|
*wherep = target;
|
2019-06-25 00:40:44 +00:00
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
2019-12-24 16:13:15 +00:00
|
|
|
/*
|
|
|
|
* BSS-PLT optimization:
|
|
|
|
* Branch directly to the target if it is within +/- 32Mb,
|
|
|
|
* otherwise go indirectly via the pltcall trampoline call and
|
|
|
|
* jump table.
|
|
|
|
*/
|
|
|
|
offset = target - (Elf_Addr)wherep;
|
2014-12-28 19:55:44 +00:00
|
|
|
if (abs((int)offset) < 32*1024*1024) { /* inside 32MB? */
|
2019-12-24 16:13:15 +00:00
|
|
|
/*
|
|
|
|
* At the PLT entry pointed at by `wherep', construct
|
|
|
|
* a direct transfer to the now fully resolved function
|
|
|
|
* address.
|
|
|
|
*/
|
2002-12-04 07:32:20 +00:00
|
|
|
/* b value # branch directly */
|
|
|
|
*wherep = 0x48000000 | (offset & 0x03fffffc);
|
|
|
|
__syncicache(wherep, 4);
|
|
|
|
} else {
|
|
|
|
Elf_Addr *pltcall, *jmptab;
|
|
|
|
int distance;
|
|
|
|
int N = obj->pltrelasize / sizeof(Elf_Rela);
|
|
|
|
int reloff = rela - obj->pltrela;
|
|
|
|
|
2010-02-22 16:49:45 +00:00
|
|
|
if (reloff < 0)
|
2002-12-04 07:32:20 +00:00
|
|
|
return (-1);
|
|
|
|
|
|
|
|
pltcall = obj->pltgot;
|
|
|
|
|
2010-02-22 16:49:45 +00:00
|
|
|
dbg(" reloc_jmpslot: indir, reloff=%x, N=%x\n",
|
2002-12-04 07:32:20 +00:00
|
|
|
reloff, N);
|
|
|
|
|
2010-02-22 16:49:45 +00:00
|
|
|
jmptab = obj->pltgot + JMPTAB_BASE(N);
|
2002-12-04 07:32:20 +00:00
|
|
|
jmptab[reloff] = target;
|
2012-04-23 00:54:06 +00:00
|
|
|
mb(); /* Order jmptab update before next changes */
|
2002-12-04 07:32:20 +00:00
|
|
|
|
2010-02-22 16:49:45 +00:00
|
|
|
if (reloff < PLT_EXTENDED_BEGIN) {
|
|
|
|
/* for extended PLT entries, we keep the old code */
|
|
|
|
|
|
|
|
distance = (Elf_Addr)pltcall - (Elf_Addr)(wherep + 1);
|
2002-12-04 07:32:20 +00:00
|
|
|
|
2010-02-22 16:49:45 +00:00
|
|
|
/* li r11,reloff */
|
|
|
|
/* b pltcall # use indirect pltcall routine */
|
2010-10-04 16:02:11 +00:00
|
|
|
|
|
|
|
/* first instruction same as before */
|
2010-02-22 16:49:45 +00:00
|
|
|
wherep[1] = 0x48000000 | (distance & 0x03fffffc);
|
|
|
|
__syncicache(wherep, 8);
|
|
|
|
}
|
2002-12-04 07:32:20 +00:00
|
|
|
}
|
|
|
|
|
2017-03-15 21:11:57 +00:00
|
|
|
out:
|
2002-12-04 07:32:20 +00:00
|
|
|
return (target);
|
|
|
|
}
|
|
|
|
|
2011-12-12 11:03:14 +00:00
|
|
|
int
|
2019-12-24 16:13:15 +00:00
|
|
|
reloc_iresolve(Obj_Entry *obj,
|
|
|
|
struct Struct_RtldLockState *lockstate)
|
2011-12-12 11:03:14 +00:00
|
|
|
{
|
2019-12-24 16:13:15 +00:00
|
|
|
/*
|
|
|
|
* Since PLT slots on PowerPC are always R_PPC_JMP_SLOT,
|
|
|
|
* R_PPC_IRELATIVE is in RELA.
|
|
|
|
*/
|
|
|
|
const Elf_Rela *relalim;
|
|
|
|
const Elf_Rela *rela;
|
|
|
|
Elf_Addr *where, target, *ptr;
|
|
|
|
|
|
|
|
if (!obj->irelative)
|
|
|
|
return (0);
|
|
|
|
|
|
|
|
relalim = (const Elf_Rela *)((const char *)obj->rela + obj->relasize);
|
|
|
|
for (rela = obj->rela; rela < relalim; rela++) {
|
|
|
|
if (ELF_R_TYPE(rela->r_info) == R_PPC_IRELATIVE) {
|
|
|
|
ptr = (Elf_Addr *)(obj->relocbase + rela->r_addend);
|
|
|
|
where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
|
|
|
|
|
|
|
|
lock_release(rtld_bind_lock, lockstate);
|
|
|
|
target = call_ifunc_resolver(ptr);
|
|
|
|
wlock_acquire(rtld_bind_lock, lockstate);
|
|
|
|
|
|
|
|
*where = target;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/*
|
|
|
|
* XXX Remove me when lld is fixed!
|
|
|
|
* LLD currently makes illegal relocations in the PLT.
|
|
|
|
*/
|
|
|
|
relalim = (const Elf_Rela *)((const char *)obj->pltrela + obj->pltrelasize);
|
|
|
|
for (rela = obj->pltrela; rela < relalim; rela++) {
|
|
|
|
if (ELF_R_TYPE(rela->r_info) == R_PPC_IRELATIVE) {
|
|
|
|
ptr = (Elf_Addr *)(obj->relocbase + rela->r_addend);
|
|
|
|
where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
|
|
|
|
|
|
|
|
lock_release(rtld_bind_lock, lockstate);
|
|
|
|
target = call_ifunc_resolver(ptr);
|
|
|
|
wlock_acquire(rtld_bind_lock, lockstate);
|
|
|
|
|
|
|
|
*where = target;
|
|
|
|
}
|
|
|
|
}
|
2011-12-12 11:03:14 +00:00
|
|
|
|
2019-12-24 16:13:15 +00:00
|
|
|
obj->irelative = false;
|
2011-12-12 11:03:14 +00:00
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
|
2020-02-13 23:42:09 +00:00
|
|
|
int
|
|
|
|
reloc_iresolve_nonplt(Obj_Entry *obj __unused,
|
|
|
|
struct Struct_RtldLockState *lockstate __unused)
|
|
|
|
{
|
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
|
2011-12-12 11:03:14 +00:00
|
|
|
int
|
2018-10-29 21:08:19 +00:00
|
|
|
reloc_gnu_ifunc(Obj_Entry *obj __unused, int flags __unused,
|
|
|
|
struct Struct_RtldLockState *lockstate __unused)
|
2011-12-12 11:03:14 +00:00
|
|
|
{
|
2019-12-24 16:13:15 +00:00
|
|
|
const Elf_Rela *relalim;
|
|
|
|
const Elf_Rela *rela;
|
|
|
|
Elf_Addr *where, target;
|
|
|
|
const Elf_Sym *def;
|
|
|
|
const Obj_Entry *defobj;
|
2011-12-12 11:03:14 +00:00
|
|
|
|
2019-12-24 16:13:15 +00:00
|
|
|
if (!obj->gnu_ifunc)
|
|
|
|
return (0);
|
|
|
|
relalim = (const Elf_Rela *)((const char *)obj->pltrela + obj->pltrelasize);
|
|
|
|
for (rela = obj->pltrela; rela < relalim; rela++) {
|
|
|
|
if (ELF_R_TYPE(rela->r_info) == R_PPC_JMP_SLOT) {
|
|
|
|
where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
|
|
|
|
def = find_symdef(ELF_R_SYM(rela->r_info), obj, &defobj,
|
|
|
|
SYMLOOK_IN_PLT | flags, NULL, lockstate);
|
|
|
|
if (def == NULL)
|
|
|
|
return (-1);
|
|
|
|
if (ELF_ST_TYPE(def->st_info) != STT_GNU_IFUNC)
|
|
|
|
continue;
|
|
|
|
lock_release(rtld_bind_lock, lockstate);
|
|
|
|
target = (Elf_Addr)rtld_resolve_ifunc(defobj, def);
|
|
|
|
wlock_acquire(rtld_bind_lock, lockstate);
|
|
|
|
reloc_jmpslot(where, target, defobj, obj,
|
|
|
|
(const Elf_Rel *)rela);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
obj->gnu_ifunc = false;
|
2011-12-12 11:03:14 +00:00
|
|
|
return (0);
|
|
|
|
}
|
2002-12-04 07:32:20 +00:00
|
|
|
|
|
|
|
/*
|
|
|
|
* Setup the plt glue routines.
|
|
|
|
*/
|
2010-02-22 16:49:45 +00:00
|
|
|
#define PLTCALL_SIZE 20
|
|
|
|
#define PLTLONGRESOLVE_SIZE 20
|
|
|
|
#define PLTRESOLVE_SIZE 24
|
2002-12-04 07:32:20 +00:00
|
|
|
|
|
|
|
void
|
|
|
|
init_pltgot(Obj_Entry *obj)
|
|
|
|
{
|
2010-02-22 16:49:45 +00:00
|
|
|
Elf_Word *pltcall, *pltresolve, *pltlongresolve;
|
2002-12-04 07:32:20 +00:00
|
|
|
Elf_Word *jmptab;
|
|
|
|
int N = obj->pltrelasize / sizeof(Elf_Rela);
|
|
|
|
|
|
|
|
pltcall = obj->pltgot;
|
|
|
|
|
|
|
|
if (pltcall == NULL) {
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
2019-06-25 00:40:44 +00:00
|
|
|
/* Handle Secure-PLT first, if applicable. */
|
|
|
|
if (obj->gotptr != NULL) {
|
|
|
|
obj->gotptr[1] = (Elf_Addr)_rtld_bind_secureplt_start;
|
|
|
|
obj->gotptr[2] = (Elf_Addr)obj;
|
|
|
|
dbg("obj %s secure-plt gotptr=%p start=%p obj=%p",
|
|
|
|
obj->path, obj->gotptr,
|
|
|
|
(void *)obj->gotptr[1], (void *)obj->gotptr[2]);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
2002-12-04 07:32:20 +00:00
|
|
|
/*
|
|
|
|
* From the SVR4 PPC ABI:
|
|
|
|
*
|
|
|
|
* 'The first 18 words (72 bytes) of the PLT are reserved for
|
|
|
|
* use by the dynamic linker.
|
|
|
|
* ...
|
2003-05-29 22:58:26 +00:00
|
|
|
* 'If the executable or shared object requires N procedure
|
|
|
|
* linkage table entries, the link editor shall reserve 3*N
|
|
|
|
* words (12*N bytes) following the 18 reserved words. The
|
|
|
|
* first 2*N of these words are the procedure linkage table
|
|
|
|
* entries themselves. The static linker directs calls to bytes
|
|
|
|
* (72 + (i-1)*8), for i between 1 and N inclusive. The remaining
|
2002-12-04 07:32:20 +00:00
|
|
|
* N words (4*N bytes) are reserved for use by the dynamic linker.'
|
|
|
|
*/
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Copy the absolute-call assembler stub into the first part of
|
|
|
|
* the reserved PLT area.
|
|
|
|
*/
|
|
|
|
memcpy(pltcall, _rtld_powerpc_pltcall, PLTCALL_SIZE);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Determine the address of the jumptable, which is the dyn-linker
|
|
|
|
* reserved area after the call cells. Write the absolute address
|
|
|
|
* of the jumptable into the absolute-call assembler code so it
|
|
|
|
* can determine this address.
|
|
|
|
*/
|
2010-02-22 16:49:45 +00:00
|
|
|
jmptab = obj->pltgot + JMPTAB_BASE(N);
|
2002-12-04 07:32:20 +00:00
|
|
|
pltcall[1] |= _ppc_ha(jmptab); /* addis 11,11,jmptab@ha */
|
|
|
|
pltcall[2] |= _ppc_la(jmptab); /* lwz 11,jmptab@l(11) */
|
|
|
|
|
|
|
|
/*
|
2010-02-22 16:49:45 +00:00
|
|
|
* Skip down 20 bytes into the initial reserved area and copy
|
2002-12-04 07:32:20 +00:00
|
|
|
* in the standard resolving assembler call. Into this assembler,
|
|
|
|
* insert the absolute address of the _rtld_bind_start routine
|
|
|
|
* and the address of the relocation object.
|
2010-02-22 16:49:45 +00:00
|
|
|
*
|
|
|
|
* We place pltlongresolve first, so it can fix up its arguments
|
|
|
|
* and then fall through to the regular PLT resolver.
|
2002-12-04 07:32:20 +00:00
|
|
|
*/
|
2010-02-22 16:49:45 +00:00
|
|
|
pltlongresolve = obj->pltgot + 5;
|
|
|
|
|
|
|
|
memcpy(pltlongresolve, _rtld_powerpc_pltlongresolve,
|
|
|
|
PLTLONGRESOLVE_SIZE);
|
|
|
|
pltlongresolve[0] |= _ppc_ha(jmptab); /* lis 12,jmptab@ha */
|
|
|
|
pltlongresolve[1] |= _ppc_la(jmptab); /* addi 12,12,jmptab@l */
|
2002-12-04 07:32:20 +00:00
|
|
|
|
2010-02-22 16:49:45 +00:00
|
|
|
pltresolve = pltlongresolve + PLTLONGRESOLVE_SIZE/sizeof(uint32_t);
|
2002-12-04 07:32:20 +00:00
|
|
|
memcpy(pltresolve, _rtld_powerpc_pltresolve, PLTRESOLVE_SIZE);
|
|
|
|
pltresolve[0] |= _ppc_ha(_rtld_bind_start);
|
|
|
|
pltresolve[1] |= _ppc_la(_rtld_bind_start);
|
|
|
|
pltresolve[3] |= _ppc_ha(obj);
|
|
|
|
pltresolve[4] |= _ppc_la(obj);
|
|
|
|
|
|
|
|
/*
|
2011-12-17 15:31:00 +00:00
|
|
|
* The icache will be sync'd in reloc_plt, which is called
|
|
|
|
* after all the slots have been updated
|
2002-12-04 07:32:20 +00:00
|
|
|
*/
|
|
|
|
}
|
2004-08-04 19:12:14 +00:00
|
|
|
|
2019-12-24 16:13:15 +00:00
|
|
|
/*
|
|
|
|
* 32 bit cpu feature flag fields.
|
|
|
|
*/
|
|
|
|
u_long cpu_features;
|
|
|
|
u_long cpu_features2;
|
|
|
|
|
|
|
|
void
|
|
|
|
powerpc_abi_variant_hook(Elf_Auxinfo** aux_info)
|
|
|
|
{
|
|
|
|
/*
|
|
|
|
* Since aux_info[] is easier to work with than aux, go ahead and
|
|
|
|
* initialize cpu_features / cpu_features2.
|
|
|
|
*/
|
|
|
|
cpu_features = -1UL;
|
|
|
|
cpu_features2 = -1UL;
|
|
|
|
if (aux_info[AT_HWCAP] != NULL)
|
|
|
|
cpu_features = aux_info[AT_HWCAP]->a_un.a_val;
|
|
|
|
if (aux_info[AT_HWCAP2] != NULL)
|
|
|
|
cpu_features2 = aux_info[AT_HWCAP2]->a_un.a_val;
|
|
|
|
}
|
|
|
|
|
2016-11-15 09:43:26 +00:00
|
|
|
void
|
2016-11-21 14:13:57 +00:00
|
|
|
ifunc_init(Elf_Auxinfo aux_info[__min_size(AT_COUNT)] __unused)
|
2016-11-15 09:43:26 +00:00
|
|
|
{
|
2018-02-03 23:14:11 +00:00
|
|
|
|
|
|
|
}
|
|
|
|
|
2004-08-04 19:12:14 +00:00
|
|
|
void
|
|
|
|
allocate_initial_tls(Obj_Entry *list)
|
|
|
|
{
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Fix the size of the static TLS block by using the maximum
|
|
|
|
* offset allocated so far and adding a bit for dynamic modules to
|
|
|
|
* use.
|
|
|
|
*/
|
|
|
|
|
|
|
|
tls_static_space = tls_last_offset + tls_last_size + RTLD_STATIC_TLS_EXTRA;
|
|
|
|
|
2021-12-09 21:17:54 +00:00
|
|
|
_tcb_set(allocate_tls(list, NULL, TLS_TCB_SIZE, TLS_TCB_ALIGN));
|
2004-08-04 19:12:14 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
void*
|
|
|
|
__tls_get_addr(tls_index* ti)
|
|
|
|
{
|
2021-12-09 21:17:54 +00:00
|
|
|
uintptr_t **dtvp;
|
2004-08-04 19:12:14 +00:00
|
|
|
char *p;
|
|
|
|
|
2021-12-09 21:17:54 +00:00
|
|
|
dtvp = &_tcb_get()->tcb_dtv;
|
|
|
|
p = tls_get_addr_common(dtvp, ti->ti_module, ti->ti_offset);
|
2004-11-02 09:47:01 +00:00
|
|
|
|
|
|
|
return (p + TLS_DTV_OFFSET);
|
2004-08-04 19:12:14 +00:00
|
|
|
}
|