1/*-
2 * Copyright (c) 2007 John Birrell (jb@freebsd.org)
3 * Copyright (c) 2009 Kai Wang
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28#include "_libdwarf.h"
29
30ELFTC_VCSID("$Id: dwarf_init.c 2073 2011-10-27 03:30:47Z jkoshy $");
31
32int
33dwarf_elf_init(Elf *elf, int mode, Dwarf_Handler errhand, Dwarf_Ptr errarg,
34    Dwarf_Debug *ret_dbg, Dwarf_Error *error)
35{
36	Dwarf_Debug dbg;
37	int ret;
38
39	if (elf == NULL || ret_dbg == NULL) {
40		DWARF_SET_ERROR(NULL, error, DW_DLE_ARGUMENT);
41		return (DW_DLV_ERROR);
42	}
43
44	if (mode != DW_DLC_READ) {
45		DWARF_SET_ERROR(NULL, error, DW_DLE_ARGUMENT);
46		return (DW_DLV_ERROR);
47	}
48
49	if (_dwarf_alloc(&dbg, mode, error) != DW_DLE_NONE)
50		return (DW_DLV_ERROR);
51
52	if (_dwarf_elf_init(dbg, elf, error) != DW_DLE_NONE) {
53		free(dbg);
54		return (DW_DLV_ERROR);
55	}
56
57	if ((ret = _dwarf_init(dbg, 0, errhand, errarg, error)) !=
58	    DW_DLE_NONE) {
59		_dwarf_elf_deinit(dbg);
60		free(dbg);
61		if (ret == DW_DLE_DEBUG_INFO_NULL)
62			return (DW_DLV_NO_ENTRY);
63		else
64			return (DW_DLV_ERROR);
65	}
66
67	*ret_dbg = dbg;
68
69	return (DW_DLV_OK);
70}
71
72int
73dwarf_get_elf(Dwarf_Debug dbg, Elf **elf, Dwarf_Error *error)
74{
75	Dwarf_Elf_Object *e;
76
77	if (dbg == NULL || elf == NULL) {
78		DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
79		return (DW_DLV_ERROR);
80	}
81
82	e = dbg->dbg_iface->object;
83	*elf = e->eo_elf;
84
85	return (DW_DLV_OK);
86}
87
88int
89dwarf_init(int fd, int mode, Dwarf_Handler errhand, Dwarf_Ptr errarg,
90    Dwarf_Debug *ret_dbg, Dwarf_Error *error)
91{
92	Dwarf_Debug dbg;
93	Elf *elf;
94	int ret;
95
96	if (fd < 0 || ret_dbg == NULL) {
97		DWARF_SET_ERROR(NULL, error, DW_DLE_ARGUMENT);
98		return (DW_DLV_ERROR);
99	}
100
101	if (mode != DW_DLC_READ) {
102		DWARF_SET_ERROR(NULL, error, DW_DLE_ARGUMENT);
103		return (DW_DLV_ERROR);
104	}
105
106	if (elf_version(EV_CURRENT) == EV_NONE) {
107		DWARF_SET_ELF_ERROR(NULL, error);
108		return (DW_DLV_ERROR);
109	}
110
111	if ((elf = elf_begin(fd, ELF_C_READ, NULL)) == NULL) {
112		DWARF_SET_ELF_ERROR(NULL, error);
113		return (DW_DLV_ERROR);
114	}
115
116	if (_dwarf_alloc(&dbg, mode, error) != DW_DLE_NONE)
117		return (DW_DLV_ERROR);
118
119	if (_dwarf_elf_init(dbg, elf, error) != DW_DLE_NONE) {
120		free(dbg);
121		return (DW_DLV_ERROR);
122	}
123
124	if ((ret = _dwarf_init(dbg, 0, errhand, errarg, error)) !=
125	    DW_DLE_NONE) {
126		_dwarf_elf_deinit(dbg);
127		free(dbg);
128		if (ret == DW_DLE_DEBUG_INFO_NULL)
129			return (DW_DLV_NO_ENTRY);
130		else
131			return (DW_DLV_ERROR);
132	}
133
134	*ret_dbg = dbg;
135
136	return (DW_DLV_OK);
137}
138
139int
140dwarf_object_init(Dwarf_Obj_Access_Interface *iface, Dwarf_Handler errhand,
141    Dwarf_Ptr errarg, Dwarf_Debug *ret_dbg, Dwarf_Error *error)
142{
143	Dwarf_Debug dbg;
144
145	if (iface == NULL || ret_dbg == NULL) {
146		DWARF_SET_ERROR(NULL, error, DW_DLE_ARGUMENT);
147		return (DW_DLV_ERROR);
148	}
149
150	if (_dwarf_alloc(&dbg, DW_DLC_READ, error) != DW_DLE_NONE)
151		return (DW_DLV_ERROR);
152
153	dbg->dbg_iface = iface;
154
155	if (_dwarf_init(dbg, 0, errhand, errarg, error) != DW_DLE_NONE) {
156		free(dbg);
157		return (DW_DLV_ERROR);
158	}
159
160	*ret_dbg = dbg;
161
162	return (DW_DLV_OK);
163}
164