1/*
2 * Copyright (c) 2010 The FreeBSD Foundation
3 * All rights reserved.
4 *
5 * This software was developed by Rui Paulo under sponsorship from the
6 * FreeBSD Foundation.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29#include <sys/cdefs.h>
30__FBSDID("$FreeBSD$");
31
32#include <machine/_inttypes.h>
33#include <sys/types.h>
34#include <sys/user.h>
35
36#include <err.h>
37#include <stdio.h>
38#include <stdlib.h>
39#include <string.h>
40#include <limits.h>
41#include <libproc.h>
42#include <libutil.h>
43
44#include "rtld_db.h"
45
46static int _librtld_db_debug = 0;
47#define DPRINTF(...) do {				\
48	if (_librtld_db_debug) {			\
49		fprintf(stderr, "librtld_db: DEBUG: ");	\
50		fprintf(stderr, __VA_ARGS__);		\
51	}						\
52} while (0)
53
54void
55rd_delete(rd_agent_t *rdap)
56{
57
58	free(rdap);
59}
60
61const char *
62rd_errstr(rd_err_e rderr)
63{
64
65	switch (rderr) {
66	case RD_ERR:
67		return "generic error";
68	case RD_OK:
69		return "no error";
70	case RD_NOCAPAB:
71		return "capability not supported";
72	case RD_DBERR:
73		return "database error";
74	case RD_NOBASE:
75		return "NOBASE";
76	case RD_NOMAPS:
77		return "NOMAPS";
78	default:
79		return "unknown error";
80	}
81}
82
83rd_err_e
84rd_event_addr(rd_agent_t *rdap, rd_event_e event, rd_notify_t *notify)
85{
86	rd_err_e ret;
87
88	DPRINTF("%s rdap %p event %d notify %p\n", __func__, rdap, event,
89	    notify);
90
91	ret = RD_OK;
92	switch (event) {
93	case RD_NONE:
94		break;
95	case RD_PREINIT:
96		notify->type = RD_NOTIFY_BPT;
97		notify->u.bptaddr = rdap->rda_preinit_addr;
98		break;
99	case RD_POSTINIT:
100		notify->type = RD_NOTIFY_BPT;
101		notify->u.bptaddr = rdap->rda_postinit_addr;
102		break;
103	case RD_DLACTIVITY:
104		notify->type = RD_NOTIFY_BPT;
105		notify->u.bptaddr = rdap->rda_dlactivity_addr;
106		break;
107	default:
108		ret = RD_ERR;
109		break;
110	}
111	return (ret);
112}
113
114rd_err_e
115rd_event_enable(rd_agent_t *rdap __unused, int onoff)
116{
117	DPRINTF("%s onoff %d\n", __func__, onoff);
118
119	return (RD_OK);
120}
121
122rd_err_e
123rd_event_getmsg(rd_agent_t *rdap __unused, rd_event_msg_t *msg)
124{
125	DPRINTF("%s\n", __func__);
126
127	msg->type = RD_POSTINIT;
128	msg->u.state = RD_CONSISTENT;
129
130	return (RD_OK);
131}
132
133rd_err_e
134rd_init(int version)
135{
136	char *debug = NULL;
137
138	if (version == RD_VERSION) {
139		debug = getenv("LIBRTLD_DB_DEBUG");
140		_librtld_db_debug = debug ? atoi(debug) : 0;
141		return (RD_OK);
142	} else
143		return (RD_NOCAPAB);
144}
145
146rd_err_e
147rd_loadobj_iter(rd_agent_t *rdap, rl_iter_f *cb, void *clnt_data)
148{
149	int cnt, i, lastvn = 0;
150	rd_loadobj_t rdl;
151	struct kinfo_vmentry *kves, *kve;
152
153	DPRINTF("%s\n", __func__);
154
155        if ((kves = kinfo_getvmmap(proc_getpid(rdap->rda_php), &cnt)) == NULL) {
156		warn("ERROR: kinfo_getvmmap() failed");
157		return (RD_ERR);
158	}
159	for (i = 0; i < cnt; i++) {
160		kve = kves + i;
161		if (kve->kve_type == KVME_TYPE_VNODE)
162			lastvn = i;
163		memset(&rdl, 0, sizeof(rdl));
164		/*
165		 * Map the kinfo_vmentry struct to the rd_loadobj structure.
166		 */
167		rdl.rdl_saddr = kve->kve_start;
168		rdl.rdl_eaddr = kve->kve_end;
169		rdl.rdl_offset = kve->kve_offset;
170		if (kve->kve_protection & KVME_PROT_READ)
171			rdl.rdl_prot |= RD_RDL_R;
172		if (kve->kve_protection & KVME_PROT_WRITE)
173			rdl.rdl_prot |= RD_RDL_W;
174		if (kve->kve_protection & KVME_PROT_EXEC)
175			rdl.rdl_prot |= RD_RDL_X;
176		strlcpy(rdl.rdl_path, kves[lastvn].kve_path,
177			sizeof(rdl.rdl_path));
178		(*cb)(&rdl, clnt_data);
179	}
180	free(kves);
181
182	return (RD_OK);
183}
184
185void
186rd_log(const int onoff)
187{
188	DPRINTF("%s\n", __func__);
189
190	(void)onoff;
191}
192
193rd_agent_t *
194rd_new(struct proc_handle *php)
195{
196	rd_agent_t *rdap;
197
198	rdap = malloc(sizeof(rd_agent_t));
199	if (rdap) {
200		memset(rdap, 0, sizeof(rd_agent_t));
201		rdap->rda_php = php;
202		rd_reset(rdap);
203	}
204
205	return (rdap);
206}
207
208rd_err_e
209rd_objpad_enable(rd_agent_t *rdap, size_t padsize)
210{
211	DPRINTF("%s\n", __func__);
212
213	(void)rdap;
214	(void)padsize;
215
216	return (RD_ERR);
217}
218
219rd_err_e
220rd_plt_resolution(rd_agent_t *rdap, uintptr_t pc, struct proc *proc,
221    uintptr_t plt_base, rd_plt_info_t *rpi)
222{
223	DPRINTF("%s\n", __func__);
224
225	(void)rdap;
226	(void)pc;
227	(void)proc;
228	(void)plt_base;
229	(void)rpi;
230
231	return (RD_ERR);
232}
233
234rd_err_e
235rd_reset(rd_agent_t *rdap)
236{
237	GElf_Sym sym;
238
239	if (proc_name2sym(rdap->rda_php, "ld-elf.so.1", "r_debug_state",
240	    &sym) < 0)
241		return (RD_ERR);
242	DPRINTF("found r_debug_state at 0x%lx\n", (unsigned long)sym.st_value);
243	rdap->rda_preinit_addr = sym.st_value;
244	rdap->rda_dlactivity_addr = sym.st_value;
245
246	if (proc_name2sym(rdap->rda_php, "ld-elf.so.1", "_r_debug_postinit",
247	    &sym) < 0)
248		return (RD_ERR);
249	DPRINTF("found _r_debug_postinit at 0x%lx\n",
250	    (unsigned long)sym.st_value);
251	rdap->rda_postinit_addr = sym.st_value;
252
253	return (RD_OK);
254}
255