1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2010 The FreeBSD Foundation
5 * All rights reserved.
6 *
7 * This software was developed by Rui Paulo under sponsorship from the
8 * FreeBSD Foundation.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33#include <stdio.h>
34#include <stdlib.h>
35#include <string.h>
36
37#include <rtld_db.h>
38
39#include "_libproc.h"
40
41static void	rdl2prmap(const rd_loadobj_t *, prmap_t *);
42
43static int
44map_iter(const rd_loadobj_t *lop, void *arg)
45{
46	struct file_info *file;
47	struct map_info *mapping, *tmp;
48	struct proc_handle *phdl;
49	size_t i;
50
51	phdl = arg;
52	if (phdl->nmappings >= phdl->maparrsz) {
53		phdl->maparrsz *= 2;
54		tmp = reallocarray(phdl->mappings, phdl->maparrsz,
55		    sizeof(*phdl->mappings));
56		if (tmp == NULL)
57			return (-1);
58		phdl->mappings = tmp;
59	}
60
61	mapping = &phdl->mappings[phdl->nmappings];
62	rdl2prmap(lop, &mapping->map);
63	if (strcmp(lop->rdl_path, phdl->execpath) == 0 &&
64	    (lop->rdl_prot & RD_RDL_X) != 0)
65		phdl->exec_map = phdl->nmappings;
66
67	file = NULL;
68	if (lop->rdl_path[0] != '\0') {
69		/* Look for an existing mapping of the same file. */
70		for (i = 0; i < phdl->nmappings; i++)
71			if (strcmp(mapping->map.pr_mapname,
72			    phdl->mappings[i].map.pr_mapname) == 0) {
73				file = phdl->mappings[i].file;
74				break;
75			}
76
77		if (file == NULL) {
78			file = malloc(sizeof(*file));
79			if (file == NULL)
80				return (-1);
81			file->elf = NULL;
82			file->fd = -1;
83			file->refs = 1;
84		} else
85			file->refs++;
86	}
87	mapping->file = file;
88	phdl->nmappings++;
89	return (0);
90}
91
92static void
93rdl2prmap(const rd_loadobj_t *rdl, prmap_t *map)
94{
95
96	map->pr_vaddr = rdl->rdl_saddr;
97	map->pr_size = rdl->rdl_eaddr - rdl->rdl_saddr;
98	map->pr_offset = rdl->rdl_offset;
99	map->pr_mflags = 0;
100	if (rdl->rdl_prot & RD_RDL_R)
101		map->pr_mflags |= MA_READ;
102	if (rdl->rdl_prot & RD_RDL_W)
103		map->pr_mflags |= MA_WRITE;
104	if (rdl->rdl_prot & RD_RDL_X)
105		map->pr_mflags |= MA_EXEC;
106	(void)strlcpy(map->pr_mapname, rdl->rdl_path,
107	    sizeof(map->pr_mapname));
108}
109
110rd_agent_t *
111proc_rdagent(struct proc_handle *phdl)
112{
113
114	if (phdl->rdap == NULL && phdl->status != PS_UNDEAD &&
115	    phdl->status != PS_IDLE) {
116		if ((phdl->rdap = rd_new(phdl)) == NULL)
117			return (NULL);
118
119		phdl->maparrsz = 64;
120		phdl->mappings = calloc(phdl->maparrsz,
121		    sizeof(*phdl->mappings));
122		if (phdl->mappings == NULL)
123			return (phdl->rdap);
124		if (rd_loadobj_iter(phdl->rdap, map_iter, phdl) != RD_OK)
125			return (NULL);
126	}
127	return (phdl->rdap);
128}
129
130void
131proc_updatesyms(struct proc_handle *phdl)
132{
133
134	memset(phdl->mappings, 0, sizeof(*phdl->mappings) * phdl->maparrsz);
135	rd_loadobj_iter(phdl->rdap, map_iter, phdl);
136}
137