/*
* 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 2008 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <dlfcn.h>
#include <sys/modctl.h>
#include <sys/kobj.h>
#include <kmdb/kmdb_module.h>
#include <mdb/mdb_debug.h>
#include <mdb/mdb_gelf.h>
#include <mdb/mdb_string.h>
#include <mdb/mdb.h>
/*
* kmdb libdl-style interface for the manipulation of dmods.
*/
static char *dl_errstr;
static kmdb_modctl_t *
dl_name2ctl(const char *pathname)
{
mdb_var_t *v;
if ((v = mdb_nv_lookup(&mdb.m_dmodctl, strbasename(pathname))) ==
NULL)
return (NULL);
return ((kmdb_modctl_t *)MDB_NV_COOKIE(v));
}
/*ARGSUSED*/
void *
dlmopen(Lmid_t lmid, const char *pathname, int mode)
{
kmdb_modctl_t *kmc;
if ((kmc = dl_name2ctl(pathname)) == NULL) {
dl_errstr = "unregistered module";
return (NULL);
}
kmc->kmc_dlrefcnt++;
dl_errstr = NULL;
return (kmc);
}
int
dlclose(void *dlp)
{
kmdb_modctl_t *kmc = dlp;
dl_errstr = NULL;
ASSERT(kmc->kmc_dlrefcnt > 0);
if (--kmc->kmc_dlrefcnt > 0)
return (0);
return (0);
}
char *
dlerror(void)
{
char *str = dl_errstr;
dl_errstr = NULL;
return (str);
}
static void *
dl_findsym(kmdb_modctl_t *kmc, const char *name)
{
GElf_Sym sym;
uint_t symid;
if (mdb_gelf_symtab_lookup_by_name(kmc->kmc_symtab, name, &sym,
&symid) < 0)
return (NULL);
return ((void *)(uintptr_t)sym.st_value);
}
/*ARGSUSED*/
void *
dlsym(void *dlp, const char *name)
{
kmdb_modctl_t *kmc = dlp;
mdb_var_t *v;
void *addr;
switch ((uintptr_t)dlp) {
case (uintptr_t)RTLD_NEXT:
mdb_nv_rewind(&mdb.m_dmodctl);
while ((v = mdb_nv_advance(&mdb.m_dmodctl)) != NULL) {
if ((addr = dl_findsym(MDB_NV_COOKIE(v), name)) != NULL)
break;
}
break;
case (uintptr_t)RTLD_DEFAULT:
case (uintptr_t)RTLD_SELF:
dl_errstr = "invalid handle";
return (NULL);
default:
addr = dl_findsym(kmc, name);
}
dl_errstr = (addr == NULL) ? "symbol not found" : NULL;
return (addr);
}
#pragma weak _dladdr1 = dladdr1
/*ARGSUSED*/
int
dladdr1(void *address, Dl_info *dlip, void **info, int flags)
{
/*
* umem uses this for debugging information. We'll pretend to fail.
*/
return (0);
}