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 __unused, rd_notify_t *notify)
85{
86	DPRINTF("%s rdap %p notify %p\n", __func__, rdap, notify);
87
88	notify->type = RD_NOTIFY_BPT;
89	notify->u.bptaddr = rdap->rda_addr;
90
91	return (RD_OK);
92}
93
94rd_err_e
95rd_event_enable(rd_agent_t *rdap __unused, int onoff)
96{
97	DPRINTF("%s onoff %d\n", __func__, onoff);
98
99	return (RD_OK);
100}
101
102rd_err_e
103rd_event_getmsg(rd_agent_t *rdap __unused, rd_event_msg_t *msg)
104{
105	DPRINTF("%s\n", __func__);
106
107	msg->type = RD_POSTINIT;
108	msg->u.state = RD_CONSISTENT;
109
110	return (RD_OK);
111}
112
113rd_err_e
114rd_init(int version)
115{
116	char *debug = NULL;
117
118	if (version == RD_VERSION) {
119		debug = getenv("LIBRTLD_DB_DEBUG");
120		_librtld_db_debug = debug ? atoi(debug) : 0;
121		return (RD_OK);
122	} else
123		return (RD_NOCAPAB);
124}
125
126rd_err_e
127rd_loadobj_iter(rd_agent_t *rdap, rl_iter_f *cb, void *clnt_data)
128{
129	int cnt, i, lastvn = 0;
130	rd_loadobj_t rdl;
131	struct kinfo_vmentry *kves, *kve;
132
133	DPRINTF("%s\n", __func__);
134
135        if ((kves = kinfo_getvmmap(proc_getpid(rdap->rda_php), &cnt)) == NULL) {
136		warn("ERROR: kinfo_getvmmap() failed");
137		return (RD_ERR);
138	}
139	for (i = 0; i < cnt; i++) {
140		kve = kves + i;
141		if (kve->kve_type == KVME_TYPE_VNODE)
142			lastvn = i;
143		memset(&rdl, 0, sizeof(rdl));
144		/*
145		 * Map the kinfo_vmentry struct to the rd_loadobj structure.
146		 */
147		rdl.rdl_saddr = kve->kve_start;
148		rdl.rdl_eaddr = kve->kve_end;
149		rdl.rdl_offset = kve->kve_offset;
150		if (kve->kve_protection & KVME_PROT_READ)
151			rdl.rdl_prot |= RD_RDL_R;
152		if (kve->kve_protection & KVME_PROT_WRITE)
153			rdl.rdl_prot |= RD_RDL_W;
154		if (kve->kve_protection & KVME_PROT_EXEC)
155			rdl.rdl_prot |= RD_RDL_X;
156		strlcpy(rdl.rdl_path, kves[lastvn].kve_path,
157			sizeof(rdl.rdl_path));
158		(*cb)(&rdl, clnt_data);
159	}
160	free(kves);
161
162	return (RD_OK);
163}
164
165void
166rd_log(const int onoff)
167{
168	DPRINTF("%s\n", __func__);
169
170	(void)onoff;
171}
172
173rd_agent_t *
174rd_new(struct proc_handle *php)
175{
176	rd_agent_t *rdap;
177
178	rdap = malloc(sizeof(rd_agent_t));
179	if (rdap) {
180		memset(rdap, 0, sizeof(rd_agent_t));
181		rdap->rda_php = php;
182		rd_reset(rdap);
183	}
184
185	return (rdap);
186}
187
188rd_err_e
189rd_objpad_enable(rd_agent_t *rdap, size_t padsize)
190{
191	DPRINTF("%s\n", __func__);
192
193	(void)rdap;
194	(void)padsize;
195
196	return (RD_ERR);
197}
198
199rd_err_e
200rd_plt_resolution(rd_agent_t *rdap, uintptr_t pc, struct proc *proc,
201    uintptr_t plt_base, rd_plt_info_t *rpi)
202{
203	DPRINTF("%s\n", __func__);
204
205	(void)rdap;
206	(void)pc;
207	(void)proc;
208	(void)plt_base;
209	(void)rpi;
210
211	return (RD_ERR);
212}
213
214rd_err_e
215rd_reset(rd_agent_t *rdap)
216{
217	GElf_Sym sym;
218
219	if (proc_name2sym(rdap->rda_php, "ld-elf.so.1", "r_debug_state",
220	    &sym) < 0)
221		return (RD_ERR);
222	DPRINTF("found r_debug_state at 0x%lx\n", (unsigned long)sym.st_value);
223	rdap->rda_addr = sym.st_value;
224
225	return (RD_OK);
226}
227