1/*-
2 * Copyright (c) 2009 Kai Wang
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include "_libdwarf.h"
28
29ELFTC_VCSID("$Id: libdwarf_elf_access.c 2070 2011-10-27 03:05:32Z jkoshy $");
30
31int
32_dwarf_elf_get_section_info(void *obj, Dwarf_Half ndx,
33    Dwarf_Obj_Access_Section *ret_section, int *error)
34{
35	Dwarf_Elf_Object *e;
36	GElf_Shdr *sh;
37
38	e = obj;
39	assert(e != NULL);
40
41	if (ret_section == NULL) {
42		if (error)
43			*error = DW_DLE_ARGUMENT;
44		return (DW_DLV_ERROR);
45	}
46
47	if (ndx >= e->eo_seccnt) {
48		if (error)
49			*error = DW_DLE_NO_ENTRY;
50		return (DW_DLV_NO_ENTRY);
51	}
52
53	sh = &e->eo_shdr[ndx];
54
55	ret_section->addr = sh->sh_addr;
56	ret_section->size = sh->sh_size;
57
58	ret_section->name = elf_strptr(e->eo_elf, e->eo_strndx, sh->sh_name);
59	if (ret_section->name == NULL) {
60		if (error)
61			*error = DW_DLE_ELF;
62		return (DW_DLV_ERROR);
63	}
64
65	return (DW_DLV_OK);
66}
67
68Dwarf_Endianness
69_dwarf_elf_get_byte_order(void *obj)
70{
71	Dwarf_Elf_Object *e;
72
73	e = obj;
74	assert(e != NULL);
75
76	switch (e->eo_ehdr.e_ident[EI_DATA]) {
77	case ELFDATA2MSB:
78		return (DW_OBJECT_MSB);
79
80	case ELFDATA2LSB:
81	case ELFDATANONE:
82	default:
83		return (DW_OBJECT_LSB);
84	}
85}
86
87Dwarf_Small
88_dwarf_elf_get_length_size(void *obj)
89{
90	Dwarf_Elf_Object *e;
91
92	e = obj;
93	assert(e != NULL);
94
95	if (gelf_getclass(e->eo_elf) == ELFCLASS32)
96		return (4);
97	else if (e->eo_ehdr.e_machine == EM_MIPS)
98		return (8);
99	else
100		return (4);
101}
102
103Dwarf_Small
104_dwarf_elf_get_pointer_size(void *obj)
105{
106	Dwarf_Elf_Object *e;
107
108	e = obj;
109	assert(e != NULL);
110
111	if (gelf_getclass(e->eo_elf) == ELFCLASS32)
112		return (4);
113	else
114		return (8);
115}
116
117Dwarf_Unsigned
118_dwarf_elf_get_section_count(void *obj)
119{
120	Dwarf_Elf_Object *e;
121
122	e = obj;
123	assert(e != NULL);
124
125	return (e->eo_seccnt);
126}
127
128int
129_dwarf_elf_load_section(void *obj, Dwarf_Half ndx, Dwarf_Small** ret_data,
130    int *error)
131{
132	Dwarf_Elf_Object *e;
133	Dwarf_Elf_Data *ed;
134
135	e = obj;
136	assert(e != NULL);
137
138	if (ret_data == NULL) {
139		if (error)
140			*error = DW_DLE_ARGUMENT;
141		return (DW_DLV_ERROR);
142	}
143
144	if (ndx >= e->eo_seccnt) {
145		if (error)
146			*error = DW_DLE_NO_ENTRY;
147		return (DW_DLV_NO_ENTRY);
148	}
149
150	ed = &e->eo_data[ndx];
151
152	if (ed->ed_alloc != NULL)
153		*ret_data = ed->ed_alloc;
154	else {
155		if (ed->ed_data == NULL) {
156			if (error)
157				*error = DW_DLE_NO_ENTRY;
158			return (DW_DLV_NO_ENTRY);
159		}
160		*ret_data = ed->ed_data->d_buf;
161	}
162
163	return (DW_DLV_OK);
164}
165