entry.c revision 0bc07c75e71baa4cc26f90611864f7e60dcea093
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 1988 AT&T
* All Rights Reserved
*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <stdio.h>
#include <memory.h>
#include <debug.h>
#include "msg.h"
#include "_libld.h"
/*
* The loader uses a `segment descriptor' list to describe the output
* segments it can potentially create. Additional segments may be added
* using a map file.
*/
#if defined(_ELF64)
/* Phdr packing changes under Elf64 */
static Sg_desc sg_desc[LD_NUM] = {
{{PT_PHDR, PF_R + PF_X, 0, 0, 0, 0, 0, 0},
MSG_ORIG(MSG_ENT_PHDR), 0, 0, NULL, NULL,
(FLG_SG_TYPE | FLG_SG_FLAGS), NULL, 0, 0},
{{PT_INTERP, PF_R, 0, 0, 0, 0, 0, 0},
MSG_ORIG(MSG_ENT_INTERP), 0, 0, NULL, NULL,
(FLG_SG_TYPE | FLG_SG_FLAGS), NULL, 0, 0},
{{PT_SUNWCAP, PF_R, 0, 0, 0, 0, 0, 0},
MSG_ORIG(MSG_ENT_SUNWCAP), 0, 0, NULL, NULL,
(FLG_SG_TYPE | FLG_SG_FLAGS), NULL, 0, 0},
{{PT_LOAD, PF_R + PF_X, 0, 0, 0, 0, 0, 0},
MSG_ORIG(MSG_ENT_TEXT), 0, 0, NULL, NULL,
(FLG_SG_TYPE | FLG_SG_FLAGS), NULL, 0, 0},
{{PT_LOAD, M_DATASEG_PERM, 0, 0, 0, 0, 0, 0},
MSG_ORIG(MSG_ENT_DATA), 0, 0, NULL, NULL,
(FLG_SG_TYPE | FLG_SG_FLAGS), NULL, 0, 0},
{{PT_LOAD, M_DATASEG_PERM, 0, 0, 0, 0, 0, 0},
MSG_ORIG(MSG_ENT_BSS), 0, 0, NULL, NULL,
(FLG_SG_TYPE | FLG_SG_FLAGS | FLG_SG_DISABLED), NULL, 0, 0},
#if (defined(__i386) || defined(__amd64)) && defined(_ELF64)
{{PT_LOAD, PF_R, 0, 0, 0, 0, 0, 0},
MSG_ORIG(MSG_ENT_LRODATA), 0, 0, NULL, NULL,
(FLG_SG_TYPE | FLG_SG_FLAGS), NULL, 0, 0},
{{PT_LOAD, M_DATASEG_PERM, 0, 0, 0, 0, 0, 0},
MSG_ORIG(MSG_ENT_LDATA), 0, 0, NULL, NULL,
(FLG_SG_TYPE | FLG_SG_FLAGS), NULL, 0, 0},
#endif
{{PT_DYNAMIC, M_DATASEG_PERM, 0, 0, 0, 0, 0, 0},
MSG_ORIG(MSG_ENT_DYNAMIC), 0, 0, NULL, NULL,
(FLG_SG_TYPE | FLG_SG_FLAGS), NULL, 0, 0},
{{PT_SUNWDTRACE, M_DATASEG_PERM | PF_X, 0, 0, 0, 0, 0, 0},
MSG_ORIG(MSG_ENT_DTRACE), 0, 0, NULL, NULL,
(FLG_SG_TYPE | FLG_SG_FLAGS), NULL, 0, 0},
{{PT_NOTE, 0, 0, 0, 0, 0, 0, 0},
MSG_ORIG(MSG_ENT_NOTE), 0, 0, NULL, NULL,
FLG_SG_TYPE, NULL, 0, 0},
{{PT_SUNWBSS, 0, 0, 0, 0, 0, 0, 0},
MSG_ORIG(MSG_ENT_SUNWBSS), 0, 0, NULL, NULL,
FLG_SG_TYPE, NULL, 0, 0},
{{PT_TLS, PF_R, 0, 0, 0, 0, 0, 0},
MSG_ORIG(MSG_ENT_TLS), 0, 0, NULL, NULL,
(FLG_SG_TYPE | FLG_SG_FLAGS), NULL, 0, 0},
#if defined(__i386) || defined(__amd64)
{{PT_SUNW_UNWIND, PF_R, 0, 0, 0, 0, 0, 0},
MSG_ORIG(MSG_ENT_UNWIND), 0, 0, NULL, NULL,
(FLG_SG_TYPE | FLG_SG_FLAGS), NULL, 0, 0},
#endif
{{PT_NULL, 0, 0, 0, 0, 0, 0, 0},
MSG_ORIG(MSG_STR_EMPTY), 0, 0, NULL, NULL,
FLG_SG_TYPE, NULL, 0, 0}
};
#else /* Elf32 */
static Sg_desc sg_desc[LD_NUM] = {
{{PT_PHDR, 0, 0, 0, 0, 0, PF_R + PF_X, 0},
MSG_ORIG(MSG_ENT_PHDR), 0, 0, NULL, NULL,
(FLG_SG_TYPE | FLG_SG_FLAGS), NULL, 0, 0},
{{PT_INTERP, 0, 0, 0, 0, 0, PF_R, 0},
MSG_ORIG(MSG_ENT_INTERP), 0, 0, NULL, NULL,
(FLG_SG_TYPE | FLG_SG_FLAGS), NULL, 0, 0},
{{PT_SUNWCAP, 0, 0, 0, 0, 0, PF_R, 0},
MSG_ORIG(MSG_ENT_SUNWCAP), 0, 0, NULL, NULL,
(FLG_SG_TYPE | FLG_SG_FLAGS), NULL, 0, 0},
{{PT_LOAD, 0, 0, 0, 0, 0, PF_R + PF_X, 0},
MSG_ORIG(MSG_ENT_TEXT), 0, 0, NULL, NULL,
(FLG_SG_TYPE | FLG_SG_FLAGS), NULL, 0, 0},
{{PT_LOAD, 0, 0, 0, 0, 0, M_DATASEG_PERM, 0},
MSG_ORIG(MSG_ENT_DATA), 0, 0, NULL, NULL,
(FLG_SG_TYPE | FLG_SG_FLAGS), NULL, 0, 0},
{{PT_LOAD, 0, 0, 0, 0, 0, M_DATASEG_PERM, 0},
MSG_ORIG(MSG_ENT_BSS), 0, 0, NULL, NULL,
(FLG_SG_TYPE | FLG_SG_FLAGS | FLG_SG_DISABLED), NULL, 0, 0},
{{PT_DYNAMIC, 0, 0, 0, 0, 0, M_DATASEG_PERM, 0},
MSG_ORIG(MSG_ENT_DYNAMIC), 0, 0, NULL, NULL,
(FLG_SG_TYPE | FLG_SG_FLAGS), NULL, 0, 0},
{{PT_SUNWDTRACE, 0, 0, 0, 0, 0, M_DATASEG_PERM, 0},
MSG_ORIG(MSG_ENT_DTRACE), 0, 0, NULL, NULL,
(FLG_SG_TYPE | FLG_SG_FLAGS), NULL, 0, 0},
{{PT_NOTE, 0, 0, 0, 0, 0, 0, 0},
MSG_ORIG(MSG_ENT_NOTE), 0, 0, NULL, NULL,
FLG_SG_TYPE, NULL, 0, 0},
{{PT_SUNWBSS, 0, 0, 0, 0, 0, 0, 0},
MSG_ORIG(MSG_ENT_SUNWBSS), 0, 0, NULL, NULL,
FLG_SG_TYPE, NULL, 0, 0},
{{PT_TLS, PF_R, 0, 0, 0, 0, 0, 0},
MSG_ORIG(MSG_ENT_TLS), 0, 0, NULL, NULL,
(FLG_SG_TYPE | FLG_SG_FLAGS), NULL, 0, 0},
{{PT_NULL, 0, 0, 0, 0, 0, 0, 0},
MSG_ORIG(MSG_STR_EMPTY), 0, 0, NULL, NULL,
FLG_SG_TYPE, NULL, 0, 0}
};
#endif /* Elfxx */
/*
* The input processing of the loader involves matching the sections of its
* input files to an `entrance descriptor definition'. The entrance criteria
* is different for either a static or dynamic linkage, and may even be
* modified further using a map file. Each entrance criteria is associated
* with a segment descriptor, thus a mapping of input sections to output
* segments is maintained.
*/
static const Ent_desc ent_desc[] = {
{{NULL, NULL}, MSG_ORIG(MSG_SCN_SUNWBSS), NULL,
SHF_ALLOC + SHF_WRITE, SHF_ALLOC + SHF_WRITE,
(Sg_desc *)LD_SUNWBSS, 0, FALSE},
{{NULL, NULL}, NULL, SHT_NOTE, 0, 0,
(Sg_desc *)LD_NOTE, 0, FALSE},
#if (defined(__i386) || defined(__amd64)) && defined(_ELF64)
{{NULL, NULL}, MSG_ORIG(MSG_SCN_LRODATA), NULL,
SHF_ALLOC + SHF_AMD64_LARGE, SHF_ALLOC + SHF_AMD64_LARGE,
(Sg_desc *)LD_LRODATA, 0, FALSE},
#endif
{{NULL, NULL}, NULL, NULL,
SHF_ALLOC + SHF_WRITE, SHF_ALLOC,
(Sg_desc *)LD_TEXT, 0, FALSE},
{{NULL, NULL}, NULL, SHT_NOBITS,
SHF_ALLOC + SHF_WRITE, SHF_ALLOC + SHF_WRITE,
(Sg_desc *)LD_BSS, 0, FALSE},
#if (defined(__i386) || defined(__amd64)) && defined(_ELF64)
{{NULL, NULL}, NULL, SHT_NOBITS,
SHF_ALLOC + SHF_WRITE + SHF_AMD64_LARGE,
SHF_ALLOC + SHF_WRITE + SHF_AMD64_LARGE,
(Sg_desc *)LD_DATA, 0, FALSE},
{{NULL, NULL}, NULL, NULL,
SHF_ALLOC + SHF_WRITE + SHF_AMD64_LARGE,
SHF_ALLOC + SHF_WRITE + SHF_AMD64_LARGE,
(Sg_desc *)LD_LDATA, 0, FALSE},
#endif
{{NULL, NULL}, NULL, NULL,
SHF_ALLOC + SHF_WRITE, SHF_ALLOC + SHF_WRITE,
(Sg_desc *)LD_DATA, 0, FALSE},
{{NULL, NULL}, NULL, 0, 0, 0,
(Sg_desc *)LD_EXTRA, 0, FALSE}
};
/*
* Initialize new entrance and segment descriptors and add them as lists to
* the output file descriptor.
*/
uintptr_t
ld_ent_setup(Ofl_desc * ofl, Xword segalign)
{
Ent_desc * enp;
Sg_desc * sgp;
size_t size;
/*
* Initialize the elf library.
*/
if (elf_version(EV_CURRENT) == EV_NONE) {
eprintf(ofl->ofl_lml, ERR_FATAL, MSG_INTL(MSG_ELF_LIBELF),
EV_CURRENT);
return (S_ERROR);
}
/*
* Initialize internal Global Symbol Table AVL tree
*/
avl_create(&ofl->ofl_symavl, &ld_sym_avl_comp, sizeof (Sym_avlnode),
SGSOFFSETOF(Sym_avlnode, sav_node));
/*
* The datasegment permissions can differ depending on whether
* this object is built statically or dynamically.
*/
if (ofl->ofl_flags & FLG_OF_DYNAMIC) {
sg_desc[LD_DATA].sg_phdr.p_flags = M_DATASEG_PERM;
sg_desc[LD_SUNWBSS].sg_phdr.p_flags = M_DATASEG_PERM;
} else {
sg_desc[LD_DATA].sg_phdr.p_flags = M_DATASEG_PERM | PF_X;
}
/*
* Allocate and initialize writable copies of both the entrance and
* segment descriptors.
*/
if ((sgp = libld_malloc(sizeof (sg_desc))) == 0)
return (S_ERROR);
(void) memcpy(sgp, sg_desc, sizeof (sg_desc));
if ((enp = libld_malloc(sizeof (ent_desc))) == 0)
return (S_ERROR);
(void) memcpy(enp, ent_desc, sizeof (ent_desc));
/*
* Traverse the new entrance descriptor list converting the segment
* pointer entries to the absolute address within the new segment
* descriptor list. Add each entrance descriptor to the output file
* list.
*/
for (size = 0; size < sizeof (ent_desc); size += sizeof (Ent_desc)) {
enp->ec_segment = &sgp[(long)enp->ec_segment];
if ((list_appendc(&ofl->ofl_ents, enp)) == 0)
return (S_ERROR);
enp++;
}
/*
* Traverse the new segment descriptor list adding each entry to the
* segment descriptor list. For each loadable segment initialize
* a default alignment (ld(1) and ld.so.1 initialize this differently).
*/
for (size = 0; size < sizeof (sg_desc); size += sizeof (Sg_desc)) {
Phdr * phdr = &(sgp->sg_phdr);
if ((list_appendc(&ofl->ofl_segs, sgp)) == 0)
return (S_ERROR);
if (phdr->p_type == PT_LOAD)
phdr->p_align = segalign;
sgp++;
}
return (1);
}