1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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__FBSDID("$FreeBSD$");
34
35#include <stdio.h>
36#include <stdlib.h>
37#include <string.h>
38
39#include <rtld_db.h>
40
41#include "_libproc.h"
42
43static void	rdl2prmap(const rd_loadobj_t *, prmap_t *);
44
45static int
46map_iter(const rd_loadobj_t *lop, void *arg)
47{
48	struct file_info *file;
49	struct map_info *mapping, *tmp;
50	struct proc_handle *phdl;
51	size_t i;
52
53	phdl = arg;
54	if (phdl->nmappings >= phdl->maparrsz) {
55		phdl->maparrsz *= 2;
56		tmp = reallocarray(phdl->mappings, phdl->maparrsz,
57		    sizeof(*phdl->mappings));
58		if (tmp == NULL)
59			return (-1);
60		phdl->mappings = tmp;
61	}
62
63	mapping = &phdl->mappings[phdl->nmappings];
64	rdl2prmap(lop, &mapping->map);
65	if (strcmp(lop->rdl_path, phdl->execpath) == 0 &&
66	    (lop->rdl_prot & RD_RDL_X) != 0)
67		phdl->exec_map = phdl->nmappings;
68
69	file = NULL;
70	if (lop->rdl_path[0] != '\0') {
71		/* Look for an existing mapping of the same file. */
72		for (i = 0; i < phdl->nmappings; i++)
73			if (strcmp(mapping->map.pr_mapname,
74			    phdl->mappings[i].map.pr_mapname) == 0) {
75				file = phdl->mappings[i].file;
76				break;
77			}
78
79		if (file == NULL) {
80			file = malloc(sizeof(*file));
81			if (file == NULL)
82				return (-1);
83			file->elf = NULL;
84			file->fd = -1;
85			file->refs = 1;
86		} else
87			file->refs++;
88	}
89	mapping->file = file;
90	phdl->nmappings++;
91	return (0);
92}
93
94static void
95rdl2prmap(const rd_loadobj_t *rdl, prmap_t *map)
96{
97
98	map->pr_vaddr = rdl->rdl_saddr;
99	map->pr_size = rdl->rdl_eaddr - rdl->rdl_saddr;
100	map->pr_offset = rdl->rdl_offset;
101	map->pr_mflags = 0;
102	if (rdl->rdl_prot & RD_RDL_R)
103		map->pr_mflags |= MA_READ;
104	if (rdl->rdl_prot & RD_RDL_W)
105		map->pr_mflags |= MA_WRITE;
106	if (rdl->rdl_prot & RD_RDL_X)
107		map->pr_mflags |= MA_EXEC;
108	(void)strlcpy(map->pr_mapname, rdl->rdl_path,
109	    sizeof(map->pr_mapname));
110}
111
112rd_agent_t *
113proc_rdagent(struct proc_handle *phdl)
114{
115
116	if (phdl->rdap == NULL && phdl->status != PS_UNDEAD &&
117	    phdl->status != PS_IDLE) {
118		if ((phdl->rdap = rd_new(phdl)) == NULL)
119			return (NULL);
120
121		phdl->maparrsz = 64;
122		phdl->mappings = calloc(phdl->maparrsz,
123		    sizeof(*phdl->mappings));
124		if (phdl->mappings == NULL)
125			return (phdl->rdap);
126		if (rd_loadobj_iter(phdl->rdap, map_iter, phdl) != RD_OK)
127			return (NULL);
128	}
129	return (phdl->rdap);
130}
131
132void
133proc_updatesyms(struct proc_handle *phdl)
134{
135
136	memset(phdl->mappings, 0, sizeof(*phdl->mappings) * phdl->maparrsz);
137	rd_loadobj_iter(phdl->rdap, map_iter, phdl);
138}
139