1998-09-04 19:03:57 +00:00
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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-FreeBSD
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*
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1999-06-25 02:53:59 +00:00
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* Copyright 1996, 1997, 1998, 1999 John D. Polstra.
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1998-09-04 19:03:57 +00:00
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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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1999-08-28 00:22:10 +00:00
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* $FreeBSD$
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1998-09-04 19:03:57 +00:00
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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 <sys/param.h>
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#include <sys/mman.h>
|
2016-11-15 09:43:26 +00:00
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|
#include <machine/cpufunc.h>
|
2018-10-29 23:59:26 +00:00
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|
#include <machine/specialreg.h>
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|
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#include <machine/sysarch.h>
|
1998-09-04 19:03:57 +00:00
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|
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#include <dlfcn.h>
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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 "debug.h"
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#include "rtld.h"
|
2015-03-29 18:53:21 +00:00
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#include "rtld_tls.h"
|
1998-09-04 19:03:57 +00:00
|
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|
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/*
|
2003-05-24 17:37:51 +00:00
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|
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* Process the special R_X86_64_COPY relocations in the main program. These
|
1998-09-04 19:03:57 +00:00
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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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|
*/
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|
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int
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do_copy_relocations(Obj_Entry *dstobj)
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{
|
2003-05-24 17:37:51 +00:00
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const Elf_Rela *relalim;
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const Elf_Rela *rela;
|
1998-09-04 19:03:57 +00:00
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assert(dstobj->mainprog); /* COPY relocations are invalid elsewhere */
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|
|
2018-10-29 21:08:19 +00:00
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|
relalim = (const Elf_Rela *)((const char *) dstobj->rela + dstobj->relasize);
|
2003-05-24 17:37:51 +00:00
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for (rela = dstobj->rela; rela < relalim; rela++) {
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|
|
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if (ELF_R_TYPE(rela->r_info) == R_X86_64_COPY) {
|
1998-09-04 19:03:57 +00:00
|
|
|
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;
|
2010-12-25 08:51:20 +00:00
|
|
|
const Obj_Entry *srcobj, *defobj;
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|
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SymLook req;
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|
|
int res;
|
1998-09-04 19:03:57 +00:00
|
|
|
|
2018-10-29 21:08:19 +00:00
|
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|
dstaddr = (void *)(dstobj->relocbase + rela->r_offset);
|
2003-05-24 17:37:51 +00:00
|
|
|
dstsym = dstobj->symtab + ELF_R_SYM(rela->r_info);
|
1998-09-04 19:03:57 +00:00
|
|
|
name = dstobj->strtab + dstsym->st_name;
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|
|
|
size = dstsym->st_size;
|
2010-12-25 08:51:20 +00:00
|
|
|
symlook_init(&req, name);
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|
|
|
req.ventry = fetch_ventry(dstobj, ELF_R_SYM(rela->r_info));
|
2012-03-20 13:20:49 +00:00
|
|
|
req.flags = SYMLOOK_EARLY;
|
2010-12-25 08:51:20 +00:00
|
|
|
|
2016-01-20 07:21:33 +00:00
|
|
|
for (srcobj = globallist_next(dstobj); srcobj != NULL;
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|
|
|
srcobj = globallist_next(srcobj)) {
|
2010-12-25 08:51:20 +00:00
|
|
|
res = symlook_obj(&req, srcobj);
|
|
|
|
if (res == 0) {
|
|
|
|
srcsym = req.sym_out;
|
|
|
|
defobj = req.defobj_out;
|
1998-09-04 19:03:57 +00:00
|
|
|
break;
|
2010-12-25 08:51:20 +00:00
|
|
|
}
|
|
|
|
}
|
1998-09-04 19:03:57 +00:00
|
|
|
|
|
|
|
if (srcobj == NULL) {
|
|
|
|
_rtld_error("Undefined symbol \"%s\" referenced from COPY"
|
|
|
|
" relocation in %s", name, dstobj->path);
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
2018-10-29 21:08:19 +00:00
|
|
|
srcaddr = (const void *)(defobj->relocbase + srcsym->st_value);
|
1998-09-04 19:03:57 +00:00
|
|
|
memcpy(dstaddr, srcaddr, size);
|
|
|
|
}
|
|
|
|
}
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|
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|
return 0;
|
|
|
|
}
|
|
|
|
|
1999-04-09 00:28:43 +00:00
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|
|
/* Initialize the special GOT entries. */
|
|
|
|
void
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|
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|
init_pltgot(Obj_Entry *obj)
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|
|
|
{
|
|
|
|
if (obj->pltgot != NULL) {
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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;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
1998-09-04 19:03:57 +00:00
|
|
|
/* Process the 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)
|
1998-09-04 19:03:57 +00:00
|
|
|
{
|
2003-05-24 17:37:51 +00:00
|
|
|
const Elf_Rela *relalim;
|
|
|
|
const Elf_Rela *rela;
|
2001-05-05 23:21:05 +00:00
|
|
|
SymCache *cache;
|
2014-08-29 09:29:10 +00:00
|
|
|
const Elf_Sym *def;
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const Obj_Entry *defobj;
|
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Elf_Addr *where, symval;
|
|
|
|
Elf32_Addr *where32;
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|
|
|
int r;
|
2002-06-10 18:52:31 +00:00
|
|
|
|
2014-08-29 09:29:10 +00:00
|
|
|
r = -1;
|
2018-11-23 18:15:23 +00:00
|
|
|
symval = 0;
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|
|
def = NULL;
|
|
|
|
|
2002-06-10 18:52:31 +00:00
|
|
|
/*
|
|
|
|
* The dynamic loader may be called from a thread, we have
|
|
|
|
* limited amounts of stack available so we cannot use alloca().
|
|
|
|
*/
|
2010-05-18 08:55:23 +00:00
|
|
|
if (obj != obj_rtld) {
|
2014-08-29 09:29:10 +00:00
|
|
|
cache = calloc(obj->dynsymcount, sizeof(SymCache));
|
|
|
|
/* No need to check for NULL here */
|
2010-05-18 08:55:23 +00:00
|
|
|
} else
|
2014-08-29 09:29:10 +00:00
|
|
|
cache = NULL;
|
1998-09-04 19:03:57 +00:00
|
|
|
|
2018-10-29 21:08:19 +00:00
|
|
|
relalim = (const Elf_Rela *)((const char*)obj->rela + obj->relasize);
|
2003-05-24 17:37:51 +00:00
|
|
|
for (rela = obj->rela; rela < relalim; rela++) {
|
1998-09-04 19:03:57 +00:00
|
|
|
/*
|
2014-08-29 09:29:10 +00:00
|
|
|
* First, resolve symbol for relocations which
|
|
|
|
* reference symbols.
|
1998-09-04 19:03:57 +00:00
|
|
|
*/
|
2014-08-29 09:29:10 +00:00
|
|
|
switch (ELF_R_TYPE(rela->r_info)) {
|
|
|
|
case R_X86_64_64:
|
|
|
|
case R_X86_64_PC32:
|
|
|
|
case R_X86_64_GLOB_DAT:
|
|
|
|
case R_X86_64_TPOFF64:
|
|
|
|
case R_X86_64_TPOFF32:
|
|
|
|
case R_X86_64_DTPMOD64:
|
|
|
|
case R_X86_64_DTPOFF64:
|
|
|
|
case R_X86_64_DTPOFF32:
|
|
|
|
def = find_symdef(ELF_R_SYM(rela->r_info), obj,
|
|
|
|
&defobj, flags, cache, lockstate);
|
|
|
|
if (def == NULL)
|
|
|
|
goto done;
|
|
|
|
/*
|
|
|
|
* If symbol is IFUNC, only perform relocation
|
|
|
|
* when caller allowed it by passing
|
|
|
|
* SYMLOOK_IFUNC flag. Skip the relocations
|
|
|
|
* otherwise.
|
|
|
|
*
|
|
|
|
* Also error out in case IFUNC relocations
|
|
|
|
* are specified for TLS, which cannot be
|
|
|
|
* usefully interpreted.
|
|
|
|
*/
|
|
|
|
if (ELF_ST_TYPE(def->st_info) == STT_GNU_IFUNC) {
|
|
|
|
switch (ELF_R_TYPE(rela->r_info)) {
|
|
|
|
case R_X86_64_64:
|
|
|
|
case R_X86_64_PC32:
|
|
|
|
case R_X86_64_GLOB_DAT:
|
2014-08-29 10:43:56 +00:00
|
|
|
if ((flags & SYMLOOK_IFUNC) == 0) {
|
|
|
|
obj->non_plt_gnu_ifunc = true;
|
2014-08-29 09:29:10 +00:00
|
|
|
continue;
|
2014-08-29 10:43:56 +00:00
|
|
|
}
|
2014-08-29 09:29:10 +00:00
|
|
|
symval = (Elf_Addr)rtld_resolve_ifunc(
|
|
|
|
defobj, def);
|
|
|
|
break;
|
|
|
|
case R_X86_64_TPOFF64:
|
|
|
|
case R_X86_64_TPOFF32:
|
|
|
|
case R_X86_64_DTPMOD64:
|
|
|
|
case R_X86_64_DTPOFF64:
|
|
|
|
case R_X86_64_DTPOFF32:
|
|
|
|
_rtld_error("%s: IFUNC for TLS reloc",
|
|
|
|
obj->path);
|
|
|
|
goto done;
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
if ((flags & SYMLOOK_IFUNC) != 0)
|
|
|
|
continue;
|
|
|
|
symval = (Elf_Addr)defobj->relocbase +
|
|
|
|
def->st_value;
|
2004-08-03 08:51:00 +00:00
|
|
|
}
|
2014-08-29 09:29:10 +00:00
|
|
|
break;
|
|
|
|
default:
|
|
|
|
if ((flags & SYMLOOK_IFUNC) != 0)
|
|
|
|
continue;
|
|
|
|
break;
|
2004-08-03 08:51:00 +00:00
|
|
|
}
|
2014-08-29 09:29:10 +00:00
|
|
|
where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
|
|
|
|
where32 = (Elf32_Addr *)where;
|
|
|
|
|
|
|
|
switch (ELF_R_TYPE(rela->r_info)) {
|
|
|
|
case R_X86_64_NONE:
|
|
|
|
break;
|
|
|
|
case R_X86_64_64:
|
|
|
|
*where = symval + rela->r_addend;
|
|
|
|
break;
|
|
|
|
case R_X86_64_PC32:
|
|
|
|
/*
|
|
|
|
* I don't think the dynamic linker should
|
|
|
|
* ever see this type of relocation. But the
|
|
|
|
* binutils-2.6 tools sometimes generate it.
|
|
|
|
*/
|
|
|
|
*where32 = (Elf32_Addr)(unsigned long)(symval +
|
|
|
|
rela->r_addend - (Elf_Addr)where);
|
|
|
|
break;
|
|
|
|
/* missing: R_X86_64_GOT32 R_X86_64_PLT32 */
|
|
|
|
case R_X86_64_COPY:
|
|
|
|
/*
|
|
|
|
* These are deferred until all other relocations have
|
|
|
|
* been done. All we do here is make sure that the COPY
|
2016-01-05 02:21:57 +00:00
|
|
|
* relocation is not in a shared library. They are
|
|
|
|
* allowed only in executable files.
|
2014-08-29 09:29:10 +00:00
|
|
|
*/
|
|
|
|
if (!obj->mainprog) {
|
|
|
|
_rtld_error("%s: Unexpected R_X86_64_COPY "
|
|
|
|
"relocation in shared library", obj->path);
|
|
|
|
goto done;
|
2004-08-03 08:51:00 +00:00
|
|
|
}
|
2014-08-29 09:29:10 +00:00
|
|
|
break;
|
|
|
|
case R_X86_64_GLOB_DAT:
|
|
|
|
*where = symval;
|
|
|
|
break;
|
|
|
|
case R_X86_64_TPOFF64:
|
|
|
|
/*
|
|
|
|
* We lazily allocate offsets for static TLS
|
|
|
|
* as we see the first relocation that
|
|
|
|
* references the TLS block. This allows us to
|
|
|
|
* support (small amounts of) static TLS in
|
|
|
|
* dynamically loaded modules. If we run out
|
|
|
|
* of space, we generate an error.
|
|
|
|
*/
|
|
|
|
if (!defobj->tls_done) {
|
2018-10-29 21:08:19 +00:00
|
|
|
if (!allocate_tls_offset(
|
|
|
|
__DECONST(Obj_Entry *, defobj))) {
|
2014-08-29 09:29:10 +00:00
|
|
|
_rtld_error("%s: No space available "
|
|
|
|
"for static Thread Local Storage",
|
|
|
|
obj->path);
|
|
|
|
goto done;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
*where = (Elf_Addr)(def->st_value - defobj->tlsoffset +
|
|
|
|
rela->r_addend);
|
|
|
|
break;
|
|
|
|
case R_X86_64_TPOFF32:
|
|
|
|
/*
|
|
|
|
* We lazily allocate offsets for static TLS
|
|
|
|
* as we see the first relocation that
|
|
|
|
* references the TLS block. This allows us to
|
|
|
|
* support (small amounts of) static TLS in
|
|
|
|
* dynamically loaded modules. If we run out
|
|
|
|
* of space, we generate an error.
|
|
|
|
*/
|
|
|
|
if (!defobj->tls_done) {
|
2018-10-29 21:08:19 +00:00
|
|
|
if (!allocate_tls_offset(
|
|
|
|
__DECONST(Obj_Entry *, defobj))) {
|
2014-08-29 09:29:10 +00:00
|
|
|
_rtld_error("%s: No space available "
|
|
|
|
"for static Thread Local Storage",
|
|
|
|
obj->path);
|
|
|
|
goto done;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
*where32 = (Elf32_Addr)(def->st_value -
|
|
|
|
defobj->tlsoffset + rela->r_addend);
|
|
|
|
break;
|
|
|
|
case R_X86_64_DTPMOD64:
|
|
|
|
*where += (Elf_Addr)defobj->tlsindex;
|
|
|
|
break;
|
|
|
|
case R_X86_64_DTPOFF64:
|
|
|
|
*where += (Elf_Addr)(def->st_value + rela->r_addend);
|
|
|
|
break;
|
|
|
|
case R_X86_64_DTPOFF32:
|
|
|
|
*where32 += (Elf32_Addr)(def->st_value +
|
|
|
|
rela->r_addend);
|
|
|
|
break;
|
|
|
|
case R_X86_64_RELATIVE:
|
|
|
|
*where = (Elf_Addr)(obj->relocbase + rela->r_addend);
|
|
|
|
break;
|
2020-02-13 23:42:09 +00:00
|
|
|
case R_X86_64_IRELATIVE:
|
|
|
|
obj->irelative_nonplt = true;
|
|
|
|
break;
|
|
|
|
|
2014-08-29 09:29:10 +00:00
|
|
|
/*
|
|
|
|
* missing:
|
|
|
|
* R_X86_64_GOTPCREL, R_X86_64_32, R_X86_64_32S, R_X86_64_16,
|
|
|
|
* R_X86_64_PC16, R_X86_64_8, R_X86_64_PC8
|
|
|
|
*/
|
|
|
|
default:
|
|
|
|
_rtld_error("%s: Unsupported relocation type %u"
|
|
|
|
" in non-PLT relocations\n", obj->path,
|
|
|
|
(unsigned int)ELF_R_TYPE(rela->r_info));
|
2004-08-03 08:51:00 +00:00
|
|
|
goto done;
|
|
|
|
}
|
1998-09-04 19:03:57 +00:00
|
|
|
}
|
2002-06-10 21:15:50 +00:00
|
|
|
r = 0;
|
|
|
|
done:
|
2014-08-29 09:29:10 +00:00
|
|
|
free(cache);
|
2012-03-20 13:20:49 +00:00
|
|
|
return (r);
|
1998-09-04 19:03:57 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/* Process the PLT relocations. */
|
|
|
|
int
|
2018-12-15 10:38:07 +00:00
|
|
|
reloc_plt(Obj_Entry *obj, int flags __unused, RtldLockState *lockstate __unused)
|
1998-09-04 19:03:57 +00:00
|
|
|
{
|
2003-05-24 17:37:51 +00:00
|
|
|
const Elf_Rela *relalim;
|
|
|
|
const Elf_Rela *rela;
|
1998-09-04 19:03:57 +00:00
|
|
|
|
2018-10-29 21:08:19 +00:00
|
|
|
relalim = (const Elf_Rela *)((const char *)obj->pltrela + obj->pltrelasize);
|
2003-05-24 17:37:51 +00:00
|
|
|
for (rela = obj->pltrela; rela < relalim; rela++) {
|
1999-06-25 02:53:59 +00:00
|
|
|
Elf_Addr *where;
|
1998-09-04 19:03:57 +00:00
|
|
|
|
2011-12-12 11:03:14 +00:00
|
|
|
switch(ELF_R_TYPE(rela->r_info)) {
|
|
|
|
case R_X86_64_JMP_SLOT:
|
|
|
|
/* Relocate the GOT slot pointing into the PLT. */
|
|
|
|
where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
|
|
|
|
*where += (Elf_Addr)obj->relocbase;
|
|
|
|
break;
|
|
|
|
|
|
|
|
case R_X86_64_IRELATIVE:
|
|
|
|
obj->irelative = true;
|
|
|
|
break;
|
|
|
|
|
|
|
|
default:
|
|
|
|
_rtld_error("Unknown relocation type %x in PLT",
|
|
|
|
(unsigned int)ELF_R_TYPE(rela->r_info));
|
|
|
|
return (-1);
|
|
|
|
}
|
2000-01-29 01:27:04 +00:00
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
1998-09-04 19:03:57 +00:00
|
|
|
|
2000-01-29 01:27:04 +00:00
|
|
|
/* Relocate the jump slots in an object. */
|
|
|
|
int
|
2012-03-20 13:20:49 +00:00
|
|
|
reloc_jmpslots(Obj_Entry *obj, int flags, RtldLockState *lockstate)
|
2000-01-29 01:27:04 +00:00
|
|
|
{
|
2003-05-24 17:37:51 +00:00
|
|
|
const Elf_Rela *relalim;
|
|
|
|
const Elf_Rela *rela;
|
1999-06-25 02:53:59 +00:00
|
|
|
|
2000-01-29 01:27:04 +00:00
|
|
|
if (obj->jmpslots_done)
|
|
|
|
return 0;
|
2018-10-29 21:08:19 +00:00
|
|
|
relalim = (const Elf_Rela *)((const char *)obj->pltrela + obj->pltrelasize);
|
2003-05-24 17:37:51 +00:00
|
|
|
for (rela = obj->pltrela; rela < relalim; rela++) {
|
2001-10-15 18:48:42 +00:00
|
|
|
Elf_Addr *where, target;
|
2000-01-29 01:27:04 +00:00
|
|
|
const Elf_Sym *def;
|
|
|
|
const Obj_Entry *defobj;
|
|
|
|
|
2011-12-12 11:03:14 +00:00
|
|
|
switch (ELF_R_TYPE(rela->r_info)) {
|
|
|
|
case R_X86_64_JMP_SLOT:
|
|
|
|
where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
|
2012-03-20 13:20:49 +00:00
|
|
|
def = find_symdef(ELF_R_SYM(rela->r_info), obj, &defobj,
|
|
|
|
SYMLOOK_IN_PLT | flags, NULL, lockstate);
|
2011-12-12 11:03:14 +00:00
|
|
|
if (def == NULL)
|
|
|
|
return (-1);
|
|
|
|
if (ELF_ST_TYPE(def->st_info) == STT_GNU_IFUNC) {
|
|
|
|
obj->gnu_ifunc = true;
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
target = (Elf_Addr)(defobj->relocbase + def->st_value + rela->r_addend);
|
|
|
|
reloc_jmpslot(where, target, defobj, obj, (const Elf_Rel *)rela);
|
|
|
|
break;
|
|
|
|
|
|
|
|
case R_X86_64_IRELATIVE:
|
|
|
|
break;
|
|
|
|
|
|
|
|
default:
|
|
|
|
_rtld_error("Unknown relocation type %x in PLT",
|
|
|
|
(unsigned int)ELF_R_TYPE(rela->r_info));
|
|
|
|
return (-1);
|
|
|
|
}
|
1999-06-25 02:53:59 +00:00
|
|
|
}
|
2000-01-29 01:27:04 +00:00
|
|
|
obj->jmpslots_done = true;
|
1998-09-04 19:03:57 +00:00
|
|
|
return 0;
|
|
|
|
}
|
2004-08-03 08:51:00 +00:00
|
|
|
|
2017-03-15 21:11:57 +00:00
|
|
|
/* Fixup the jump slot at "where" to transfer control to "target". */
|
|
|
|
Elf_Addr
|
|
|
|
reloc_jmpslot(Elf_Addr *where, Elf_Addr target,
|
2018-10-29 21:08:19 +00:00
|
|
|
const struct Struct_Obj_Entry *obj __unused,
|
|
|
|
const struct Struct_Obj_Entry *refobj __unused,
|
|
|
|
const Elf_Rel *rel __unused)
|
2017-03-15 21:11:57 +00:00
|
|
|
{
|
|
|
|
#ifdef dbg
|
|
|
|
dbg("reloc_jmpslot: *%p = %p", where, (void *)target);
|
|
|
|
#endif
|
|
|
|
if (!ld_bind_not)
|
|
|
|
*where = target;
|
|
|
|
return (target);
|
|
|
|
}
|
|
|
|
|
2020-02-13 23:42:09 +00:00
|
|
|
static void
|
|
|
|
reloc_iresolve_one(Obj_Entry *obj, const Elf_Rela *rela,
|
|
|
|
RtldLockState *lockstate)
|
|
|
|
{
|
|
|
|
Elf_Addr *where, target, *ptr;
|
|
|
|
|
|
|
|
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
|
|
|
int
|
|
|
|
reloc_iresolve(Obj_Entry *obj, RtldLockState *lockstate)
|
|
|
|
{
|
2020-02-13 23:42:09 +00:00
|
|
|
const Elf_Rela *relalim;
|
|
|
|
const Elf_Rela *rela;
|
2011-12-12 11:03:14 +00:00
|
|
|
|
2020-02-13 23:42:09 +00:00
|
|
|
if (!obj->irelative)
|
|
|
|
return (0);
|
|
|
|
obj->irelative = false;
|
|
|
|
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_X86_64_IRELATIVE)
|
|
|
|
reloc_iresolve_one(obj, rela, lockstate);
|
|
|
|
}
|
2011-12-14 16:47:53 +00:00
|
|
|
return (0);
|
2020-02-13 23:42:09 +00:00
|
|
|
}
|
2011-12-12 11:03:14 +00:00
|
|
|
|
2020-02-13 23:42:09 +00:00
|
|
|
int
|
|
|
|
reloc_iresolve_nonplt(Obj_Entry *obj, RtldLockState *lockstate)
|
|
|
|
{
|
|
|
|
const Elf_Rela *relalim;
|
|
|
|
const Elf_Rela *rela;
|
2011-12-12 11:03:14 +00:00
|
|
|
|
2020-02-13 23:42:09 +00:00
|
|
|
if (!obj->irelative_nonplt)
|
|
|
|
return (0);
|
|
|
|
obj->irelative_nonplt = false;
|
|
|
|
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_X86_64_IRELATIVE)
|
|
|
|
reloc_iresolve_one(obj, rela, lockstate);
|
2011-12-12 11:03:14 +00:00
|
|
|
}
|
2020-02-13 23:42:09 +00:00
|
|
|
return (0);
|
2011-12-12 11:03:14 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
int
|
2012-03-20 13:20:49 +00:00
|
|
|
reloc_gnu_ifunc(Obj_Entry *obj, int flags, RtldLockState *lockstate)
|
2011-12-12 11:03:14 +00:00
|
|
|
{
|
|
|
|
const Elf_Rela *relalim;
|
|
|
|
const Elf_Rela *rela;
|
|
|
|
|
|
|
|
if (!obj->gnu_ifunc)
|
|
|
|
return (0);
|
2018-10-29 21:08:19 +00:00
|
|
|
relalim = (const Elf_Rela *)((const char *)obj->pltrela + obj->pltrelasize);
|
2011-12-12 11:03:14 +00:00
|
|
|
for (rela = obj->pltrela; rela < relalim; rela++) {
|
|
|
|
Elf_Addr *where, target;
|
|
|
|
const Elf_Sym *def;
|
|
|
|
const Obj_Entry *defobj;
|
|
|
|
|
|
|
|
switch (ELF_R_TYPE(rela->r_info)) {
|
|
|
|
case R_X86_64_JMP_SLOT:
|
|
|
|
where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
|
2012-03-20 13:20:49 +00:00
|
|
|
def = find_symdef(ELF_R_SYM(rela->r_info), obj, &defobj,
|
|
|
|
SYMLOOK_IN_PLT | flags, NULL, lockstate);
|
2011-12-12 11:03:14 +00:00
|
|
|
if (def == NULL)
|
|
|
|
return (-1);
|
|
|
|
if (ELF_ST_TYPE(def->st_info) != STT_GNU_IFUNC)
|
|
|
|
continue;
|
2011-12-14 16:47:53 +00:00
|
|
|
lock_release(rtld_bind_lock, lockstate);
|
2011-12-12 11:03:14 +00:00
|
|
|
target = (Elf_Addr)rtld_resolve_ifunc(defobj, def);
|
2011-12-14 16:47:53 +00:00
|
|
|
wlock_acquire(rtld_bind_lock, lockstate);
|
2011-12-12 11:03:14 +00:00
|
|
|
reloc_jmpslot(where, target, defobj, obj, (const Elf_Rel *)rela);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
obj->gnu_ifunc = false;
|
2011-12-14 16:47:53 +00:00
|
|
|
return (0);
|
2011-12-12 11:03:14 +00:00
|
|
|
}
|
|
|
|
|
2016-11-15 09:43:26 +00:00
|
|
|
uint32_t cpu_feature, cpu_feature2, cpu_stdext_feature, cpu_stdext_feature2;
|
|
|
|
|
|
|
|
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
|
|
|
{
|
|
|
|
u_int p[4], cpu_high;
|
|
|
|
|
|
|
|
do_cpuid(1, p);
|
|
|
|
cpu_feature = p[3];
|
|
|
|
cpu_feature2 = p[2];
|
|
|
|
do_cpuid(0, p);
|
|
|
|
cpu_high = p[0];
|
|
|
|
if (cpu_high >= 7) {
|
|
|
|
cpuid_count(7, 0, p);
|
|
|
|
cpu_stdext_feature = p[1];
|
|
|
|
cpu_stdext_feature2 = p[2];
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2018-10-29 23:59:26 +00:00
|
|
|
int __getosreldate(void);
|
|
|
|
|
2004-08-03 08:51:00 +00:00
|
|
|
void
|
|
|
|
allocate_initial_tls(Obj_Entry *objs)
|
|
|
|
{
|
2018-10-29 23:59:26 +00:00
|
|
|
void *addr;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* 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 + RTLD_STATIC_TLS_EXTRA;
|
|
|
|
|
|
|
|
addr = allocate_tls(objs, 0, 3 * sizeof(Elf_Addr), sizeof(Elf_Addr));
|
|
|
|
if (__getosreldate() >= P_OSREL_WRFSBASE &&
|
|
|
|
(cpu_stdext_feature & CPUID_STDEXT_FSGSBASE) != 0)
|
|
|
|
wrfsbase((uintptr_t)addr);
|
|
|
|
else
|
|
|
|
sysarch(AMD64_SET_FSBASE, &addr);
|
2004-08-03 08:51:00 +00:00
|
|
|
}
|
|
|
|
|
2021-04-07 06:12:10 +00:00
|
|
|
void *
|
|
|
|
__tls_get_addr(tls_index *ti)
|
2004-08-03 08:51:00 +00:00
|
|
|
{
|
2021-04-07 03:49:28 +00:00
|
|
|
Elf_Addr **dtvp;
|
2004-08-03 08:51:00 +00:00
|
|
|
|
2021-04-07 03:49:28 +00:00
|
|
|
dtvp = _get_tp();
|
|
|
|
return (tls_get_addr_common(dtvp, ti->ti_module, ti->ti_offset));
|
2004-08-03 08:51:00 +00:00
|
|
|
}
|
2020-04-19 09:28:59 +00:00
|
|
|
|
|
|
|
size_t
|
|
|
|
calculate_first_tls_offset(size_t size, size_t align, size_t offset)
|
|
|
|
{
|
|
|
|
size_t res;
|
|
|
|
|
|
|
|
res = roundup(size, align);
|
|
|
|
offset &= align - 1;
|
|
|
|
if (offset != 0)
|
|
|
|
res += align - offset;
|
|
|
|
return (res);
|
|
|
|
}
|
|
|
|
|
|
|
|
size_t
|
|
|
|
calculate_tls_offset(size_t prev_offset, size_t prev_size __unused, size_t size,
|
|
|
|
size_t align, size_t offset)
|
|
|
|
{
|
|
|
|
size_t res;
|
|
|
|
|
|
|
|
res = roundup(prev_offset + size, align);
|
|
|
|
offset &= align - 1;
|
|
|
|
if (offset != 0)
|
|
|
|
res += align - offset;
|
|
|
|
return (res);
|
|
|
|
}
|
|
|
|
size_t
|
|
|
|
calculate_tls_end(size_t off, size_t size __unused)
|
|
|
|
{
|
|
|
|
return (off);
|
|
|
|
}
|