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/*
* 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) 1998, 2010, Oracle and/or its affiliates. All rights reserved.
*/
/*
* Object file dependent support for ELF objects.
*/
#include <stdio.h>
#include <sys/procfs.h>
#include <sys/mman.h>
#include <dlfcn.h>
#include <debug.h>
#include <conv.h>
#include "_rtld.h"
#include "_audit.h"
#include "_elf.h"
#include "_inline_gen.h"
#include "msg.h"
/*
* For backward compatibility copy relocation processing, it can be necessary to
* determine if a copy destination is also the recipient of a move record. For
* these instances, the move record addresses are retained for is_move_data().
*/
static APlist *alp = NULL;
/*
* Warning message for bad move target.
*/
void
elf_move_bad(Lm_list *lml, Rt_map *lmp, Sym *sym, ulong_t num, Addr addr)
{
const char *name;
int trace;
trace = (lml->lm_flags & LML_FLG_TRC_ENABLE) &&
(((rtld_flags & RT_FL_SILENCERR) == 0) ||
(lml->lm_flags & (LML_FLG_TRC_VERBOSE | LML_FLG_TRC_WARN)));
if ((trace == 0) && (DBG_ENABLED == 0))
return;
if (ELF_ST_BIND(sym->st_info) != STB_LOCAL)
name = (const char *)(STRTAB(lmp) + sym->st_name);
else
name = MSG_INTL(MSG_STR_UNKNOWN);
if (trace)
(void) printf(MSG_INTL(MSG_LDD_MOVE_ERR), EC_XWORD(num), name,
EC_ADDR(addr));
else
DBG_CALL(Dbg_move_bad(lml, num, name, addr));
}
/*
* Move data. Apply sparse initialization to data in zeroed bss.
*/
int
move_data(Rt_map *lmp, APlist **textrel)
{
Lm_list *lml = LIST(lmp);
Move *mv = MOVETAB(lmp);
ulong_t num, mvnum = MOVESZ(lmp) / MOVEENT(lmp);
int moves;
/*
* If these records are against the executable, and the executable was
* built prior to Solaris 8, keep track of the move record symbol. See
* comment in analyze.c:lookup_sym_interpose() in regards Solaris 8
* objects and DT_FLAGS.
*/
moves = (lmp == lml->lm_head) && ((FLAGS1(lmp) & FL1_RT_DTFLAGS) == 0);
DBG_CALL(Dbg_move_data(lmp));
for (num = 0; num < mvnum; num++, mv++) {
mmapobj_result_t *mpp;
Addr addr, taddr;
Half rep, repno, stride;
Sym *sym;
if ((sym = (Sym *)SYMTAB(lmp) + ELF_M_SYM(mv->m_info)) == 0)
continue;
stride = mv->m_stride + 1;
addr = sym->st_value;
/*
* Determine the move data target, and verify the address is
* writable.
*/
if ((FLAGS(lmp) & FLG_RT_FIXED) == 0)
addr += ADDR(lmp);
taddr = addr + mv->m_poffset;
if ((mpp = find_segment((caddr_t)taddr, lmp)) == NULL) {
elf_move_bad(lml, lmp, sym, num, taddr);
continue;
}
if (((mpp->mr_prot & PROT_WRITE) == 0) &&
((set_prot(lmp, mpp, 1) == 0) ||
(aplist_append(textrel, mpp, AL_CNT_TEXTREL) == NULL)))
return (0);
DBG_CALL(Dbg_move_entry2(lml, mv, sym->st_name,
(const char *)(sym->st_name + STRTAB(lmp))));
for (rep = 0, repno = 0; rep < mv->m_repeat; rep++) {
DBG_CALL(Dbg_move_expand(lml, mv, taddr));
switch (ELF_M_SIZE(mv->m_info)) {
case 1:
*((char *)taddr) = (char)mv->m_value;
taddr += stride;
repno++;
break;
case 2:
/* LINTED */
*((Half *)taddr) = (Half)mv->m_value;
taddr += 2 * stride;
repno++;
break;
case 4:
/* LINTED */
*((Word *)taddr) = (Word)mv->m_value;
taddr += 4 * stride;
repno++;
break;
case 8:
/* LINTED */
*((unsigned long long *)taddr) = mv->m_value;
taddr += 8 * stride;
repno++;
break;
default:
eprintf(lml, ERR_NONE, MSG_INTL(MSG_MOVE_ERR1));
break;
}
}
/*
* If any move records have been applied to this symbol, retain
* the symbol address if required for backward compatibility
* copy relocation processing.
*/
if (moves && repno &&
(aplist_append(&alp, (void *)addr, AL_CNT_MOVES) == NULL))
return (0);
}
/*
* Binaries built in the early 1990's prior to Solaris 8, using the ild
* incremental linker are known to have zero filled move sections
* (presumably place holders for new, incoming move sections). If no
* move records have been processed, remove the move identifier to
* optimize the amount of backward compatibility copy relocation
* processing that is needed.
*/
if (moves && (alp == NULL))
FLAGS(lmp) &= ~FLG_RT_MOVE;
return (1);
}
/*
* Determine whether an address is the recipient of a move record.
* Returns 1 if the address matches a move symbol, 0 otherwise.
*/
int
is_move_data(caddr_t addr)
{
caddr_t maddr;
Aliste idx;
for (APLIST_TRAVERSE(alp, idx, maddr)) {
if (addr == maddr)
return (1);
}
return (0);
}
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