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/*
* Copyright (c) 2010 The FreeBSD Foundation
* All rights reserved.
*
* This software was developed by Rui Paulo under sponsorship from the
* FreeBSD Foundation.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <machine/_inttypes.h>
#include <sys/types.h>
#include <sys/user.h>
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <libproc.h>
#include <libutil.h>
#include "rtld_db.h"
static int _librtld_db_debug = 0;
#define DPRINTF(...) do { \
if (_librtld_db_debug) { \
fprintf(stderr, "librtld_db: DEBUG: "); \
fprintf(stderr, __VA_ARGS__); \
} \
} while (0)
void
rd_delete(rd_agent_t *rdap)
{
free(rdap);
}
const char *
rd_errstr(rd_err_e rderr)
{
switch (rderr) {
case RD_ERR:
return "generic error";
case RD_OK:
return "no error";
case RD_NOCAPAB:
return "capability not supported";
case RD_DBERR:
return "database error";
case RD_NOBASE:
return "NOBASE";
case RD_NOMAPS:
return "NOMAPS";
default:
return "unknown error";
}
}
rd_err_e
rd_event_addr(rd_agent_t *rdap, rd_event_e event, rd_notify_t *notify)
{
rd_err_e ret;
DPRINTF("%s rdap %p event %d notify %p\n", __func__, rdap, event,
notify);
ret = RD_OK;
switch (event) {
case RD_NONE:
break;
case RD_PREINIT:
notify->type = RD_NOTIFY_BPT;
notify->u.bptaddr = rdap->rda_preinit_addr;
break;
case RD_POSTINIT:
notify->type = RD_NOTIFY_BPT;
notify->u.bptaddr = rdap->rda_postinit_addr;
break;
case RD_DLACTIVITY:
notify->type = RD_NOTIFY_BPT;
notify->u.bptaddr = rdap->rda_dlactivity_addr;
break;
default:
ret = RD_ERR;
break;
}
return (ret);
}
rd_err_e
rd_event_enable(rd_agent_t *rdap __unused, int onoff)
{
DPRINTF("%s onoff %d\n", __func__, onoff);
return (RD_OK);
}
rd_err_e
rd_event_getmsg(rd_agent_t *rdap __unused, rd_event_msg_t *msg)
{
DPRINTF("%s\n", __func__);
msg->type = RD_POSTINIT;
msg->u.state = RD_CONSISTENT;
return (RD_OK);
}
rd_err_e
rd_init(int version)
{
char *debug = NULL;
if (version == RD_VERSION) {
debug = getenv("LIBRTLD_DB_DEBUG");
_librtld_db_debug = debug ? atoi(debug) : 0;
return (RD_OK);
} else
return (RD_NOCAPAB);
}
rd_err_e
rd_loadobj_iter(rd_agent_t *rdap, rl_iter_f *cb, void *clnt_data)
{
int cnt, i, lastvn = 0;
rd_loadobj_t rdl;
struct kinfo_vmentry *kves, *kve;
DPRINTF("%s\n", __func__);
if ((kves = kinfo_getvmmap(proc_getpid(rdap->rda_php), &cnt)) == NULL) {
warn("ERROR: kinfo_getvmmap() failed");
return (RD_ERR);
}
for (i = 0; i < cnt; i++) {
kve = kves + i;
if (kve->kve_type == KVME_TYPE_VNODE)
lastvn = i;
memset(&rdl, 0, sizeof(rdl));
/*
* Map the kinfo_vmentry struct to the rd_loadobj structure.
*/
rdl.rdl_saddr = kve->kve_start;
rdl.rdl_eaddr = kve->kve_end;
rdl.rdl_offset = kve->kve_offset;
if (kve->kve_protection & KVME_PROT_READ)
rdl.rdl_prot |= RD_RDL_R;
if (kve->kve_protection & KVME_PROT_WRITE)
rdl.rdl_prot |= RD_RDL_W;
if (kve->kve_protection & KVME_PROT_EXEC)
rdl.rdl_prot |= RD_RDL_X;
strlcpy(rdl.rdl_path, kves[lastvn].kve_path,
sizeof(rdl.rdl_path));
(*cb)(&rdl, clnt_data);
}
free(kves);
return (RD_OK);
}
void
rd_log(const int onoff)
{
DPRINTF("%s\n", __func__);
(void)onoff;
}
rd_agent_t *
rd_new(struct proc_handle *php)
{
rd_agent_t *rdap;
rdap = malloc(sizeof(rd_agent_t));
if (rdap) {
memset(rdap, 0, sizeof(rd_agent_t));
rdap->rda_php = php;
rd_reset(rdap);
}
return (rdap);
}
rd_err_e
rd_objpad_enable(rd_agent_t *rdap, size_t padsize)
{
DPRINTF("%s\n", __func__);
(void)rdap;
(void)padsize;
return (RD_ERR);
}
rd_err_e
rd_plt_resolution(rd_agent_t *rdap, uintptr_t pc, struct proc *proc,
uintptr_t plt_base, rd_plt_info_t *rpi)
{
DPRINTF("%s\n", __func__);
(void)rdap;
(void)pc;
(void)proc;
(void)plt_base;
(void)rpi;
return (RD_ERR);
}
rd_err_e
rd_reset(rd_agent_t *rdap)
{
GElf_Sym sym;
if (proc_name2sym(rdap->rda_php, "ld-elf.so.1", "r_debug_state",
&sym, NULL) < 0)
return (RD_ERR);
DPRINTF("found r_debug_state at 0x%lx\n", (unsigned long)sym.st_value);
rdap->rda_preinit_addr = sym.st_value;
rdap->rda_dlactivity_addr = sym.st_value;
if (proc_name2sym(rdap->rda_php, "ld-elf.so.1", "_r_debug_postinit",
&sym, NULL) < 0)
return (RD_ERR);
DPRINTF("found _r_debug_postinit at 0x%lx\n",
(unsigned long)sym.st_value);
rdap->rda_postinit_addr = sym.st_value;
return (RD_OK);
}
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